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CN105420836B - Heat-preservation cotton and preparation method thereof - Google Patents

Heat-preservation cotton and preparation method thereof Download PDF

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Publication number
CN105420836B
CN105420836B CN201510969544.3A CN201510969544A CN105420836B CN 105420836 B CN105420836 B CN 105420836B CN 201510969544 A CN201510969544 A CN 201510969544A CN 105420836 B CN105420836 B CN 105420836B
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pla
polylactic
acid fiber
heat
regeneration
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CN105420836A (en
Inventor
钱程
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SUZHOU KINGCHARM NEW MATERIALS Corp.
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Jiaxing University
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
    • D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
    • D01F1/10—Other agents for modifying properties
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/02—Cotton wool; Wadding
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4326—Condensation or reaction polymers
    • D04H1/435—Polyesters
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Nonwoven Fabrics (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Biological Depolymerization Polymers (AREA)

Abstract

The invention discloses a kind of heat-preservation cotton and preparation method thereof, is related to clothes and home textile field.The heat-preservation cotton is made up of 90.2 94.5% regeneration acid fiber by polylactic and 5.5 9.8% adhesive.The preparation method of heat-preservation cotton includes：The melting of PLA leftover bits is granulated again, obtains regenerating PLA pellet；Regeneration PLA pellet is sent into melt spinning machine after drying and carries out spinning, by thermal finalization, curling and cut-out, obtains regenerating acid fiber by polylactic, the thermal finalization is divided into 3rd area, and the heat-setting time in 3rd area amounts to 8 12min；Regeneration acid fiber by polylactic is pre-processed, by shredding, mixing, combing, cross lapping, reinforcing, solidifying and setting, cutting and rolling step, heat-preservation cotton is prepared.Method provided by the invention is by lengthening the heat-setting time of acid fiber by polylactic, carry out antistatic and upper silicon processing, so as to which delayed heat is applied to the time inside acid fiber by polylactic, acid fiber by polylactic heat resistance is improved, the heat-preservation cotton of preparation is retained the bulkiness and flexibility of acid fiber by polylactic.

Description

Heat-preservation cotton and preparation method thereof
Technical field
The present invention relates to clothes and home textile field, more particularly to a kind of heat-preservation cotton and preparation method thereof.
Background technology
Acid fiber by polylactic is using the starch in the plants such as corn, wheat, cassava as raw material, through everfermentation, condensation, polymerization etc. PLA is made in series reaction, then is made by spinning.The pH value of polylactic acid fiber surface is 6-6.5, and fiber surface is in Faintly acid, it is close with the pH value of human body skin, it has skin-friendly and security, and [Ma Xiaolin acid fiber by polylactic and fabric are wet Research [D] the Tianjin University of Technology of transfer performance, 2008], while acid fiber by polylactic also has natural biocidal property and anti-mite Worm property.The regain of acid fiber by polylactic and it is strong stretch that characteristic is close with polyester fiber, there is good heat insulating ability, its thermal property is 1.5 times of cotton fiber, and processing characteristics is excellent, has been widely used for textile garment, disposable sanitary articles, agricultural covering material The end products such as material.With the quickening of the popular process of poly-lactic acid products, the whole world constantly increases to the consumption of poly-lactic acid material Add, because under normal temperature and damp condition, acid fiber by polylactic and its downstream product are a kind of materials of stable physical property, With good function and performance, its discarded object in soil or seawater through microbial action it is degradable for carbon dioxide and Water, but the cycle degraded is longer, and NatureWorks companies of the U.S. have reclaimed about 113.4t's in the operation of more than 10 years PLA resin, and change into lactic raw material, then it is polymerize and resin is made again resells；2011, BioCor companies were by 230,000 pounds PLA changes into lactic acid, and 272.2 t material is then converted into the PLA of recyclable recovery, and [such as Zheng Huilin, Su Haili, Zhang Huixuan gathers Recycling commentary [J] the Light Engineering Institutes Of Zhengzhou journal of lactic acid waste material（Natural science edition）, 2013,28(1):53- 56], therefore how caused PLA discarded object in ever-increasing various uses is more preferably utilized, is produced with lower cost The product for civilian use, further expand the occupation rate of market of poly-lactic acid material, be a good thing benefited the nation and the people.
Heat-preservation cotton is a kind of material as clothes or bed clothes interlayer, because inside and outside there is weaving face fabric parcel on two sides, because And to the strength requirement as insulation cotton fiber it is not especially high, general more fibers using hollow, high curling, it can make to be made Product produce high fluffy warming effect, and therefore, the thick denier regenerated fiber that PLA reworked material is spinned develops heat-preservation cotton, are a kind of Most suitable purposes.
Have for the relevant report for making insulation flocculus using acid fiber by polylactic virgin material：
Patent CN201410374773.6 discloses a kind of degradable environment-friendly type flocculus material and preparation method thereof, using kapok Fiber 40-80%, PLA doughnut 12-36%, PLA core-skin fibre 8-24%, the line of the PLA doughnut are close It is 38-76 ㎜ to spend for 4-10D, length, and fusing point is 160-170 DEG C；The line density of the PLA core-skin fibre is 1.5-2D, long It is 100-135 DEG C to spend for 38-76 ㎜, cortex fusing point, and sandwich layer fusing point is 160-170 DEG C, is made using PLA bicomponent fibers For bonding reinforce means and manufactured insulation flocculus；Patent CN201410413362.3 discloses a kind of pure PLA flocculus and system Method, including upper flake, middle level flocculus and lower floor's flocculus are made, the upper flake and lower floor's flocculus use diameter 1.2D-3D, length 38-64mm bi-component polylactic acid short-fiber, the middle level flocculus use diameter 3D-10D, length 42- 76mm hollow polylactic acid short-fiber, the means reinforced also with PLA bicomponent fibers as bonding, and then be made poly- Acid fiber insulation flocculus.
Patent CN200910045193.1 discloses a kind of green totally degradable warming material and its production method, uses 40~60 parts of bombax cotton, 10~40 parts of PLA bicomponent fibre, 15~40 parts of PLA doughnut；Through grab cotton, mixed cotton, Weigh, shredding, mechanical carding, in a jumble into after fluffy 3 D stereo mesh fabric net, first pass around advance acupuncture, then Formed again through processes such as hot melt sizing, cooling, windings.
Inventor is had found by many experiments, in above three patent, patent CN201410374773.6 and The insulation flocculus that CN201410413362.3 is related to acid fiber by polylactic is to be used as bonding by PLA bicomponent fibers to reinforce Medium, the temperature that bonding uses when reinforcing is 115-145 DEG C, and PLA bicomponent fibers melting range is longer, the PLA of dry state Bicomponent fibers produce softening at 80 DEG C, to 145 DEG C of all fusing completions, the skin of PLA bicomponent fibres during this Layer is that the fiber of surrounding is welded together by gradual melting, if temperature can produce more than the one-component PLA fibers on 110 DEG C of peripheries Larger contraction, while also result in part acid fiber by polylactic feel and be hardened, therefore reinforced completely using heat as PLA webs Means are difficult to realize；Patent CN200910045193.1 is that the means being combined with thermal consolidating are reinforced using mechanical acupuncture, although It can be good at realizing the good reinforcing of web, but mechanical acupuncture reinforcing can have influence on the fluffy of flocculus to a certain extent Property, therefore, when preparing warming article as raw material using PLA, acid fiber by polylactic poor heat resistance itself should be considered, examined again Consider the bulkiness of product, while take into account environmental protection and degradability and be very important, and processing method used by prior art It is difficult to keep the bulkiness and flexibility of warming article.
The content of the invention
In view of the above-mentioned problems existing in the prior art, the invention provides a kind of heat-preservation cotton and preparation method thereof.
A kind of first aspect according to embodiments of the present invention, there is provided preparation method of heat-preservation cotton, it is characterised in that the side Method includes：
The melting of PLA leftover bits is granulated again, obtains regenerating PLA pellet；
The regeneration PLA pellet is sent into melt spinning machine after drying, spinning temperature is controlled in 210-230 DEG C, spinning speed is controlled in 1000-1200m/min, after thermal finalization, curling and cut-out, obtains regenerating acid fiber by polylactic, institute State thermal finalization and be divided into 3rd area, the heat setting temperature in 3rd area is respectively 118-122 DEG C, 145-148 DEG C, 148-152 DEG C, described The heat-setting time in 3rd area amounts to 8-12min；
The regeneration acid fiber by polylactic is pre-processed, then passes through shredding, mixing, combing, cross lapping, reinforcing, solid Change sizing, cutting and rolling step, heat-preservation cotton is prepared, including：
1）Pretreatment：Antistatic and upper silicon is carried out using treatment fluid to the regeneration acid fiber by polylactic to handle, and will sprinkling The regeneration acid fiber by polylactic after the treatment fluid covers plastic cloth and boils in a covered pot over a slow fire 24h, makes the regain of the regeneration acid fiber by polylactic Reach 7-10%, surface silicone oil is 0.8-1.5%, and the proportioning of the treatment fluid is antistatic additive：Silicone oil：Water is 8-12%:6- 10%：78-86%；
2）Networking：The pretreated regeneration acid fiber by polylactic is fed to cotton and carding machine comb by shredding, mixing, air-flow Cross lapping machine is sent into after reason, obtains regenerating acid fiber by polylactic net, the number of plies of cross lapping is 3-6 layers, and lapping speed is 28- 32m/min；
3）Reinforce：From the Environment-friendlylow-temperature low-temperature adhesive that solid content is 38-50%, according to adhesive：Water is 1:3-5 ratio Example configuration work liquid, spray the working solution, the four shower nozzles spray gun to the regeneration acid fiber by polylactic net with four shower nozzle spray guns Operating pressure be 2-4.5kgf/cm2, fountain height 14-16g/s；
4）Solidifying and setting：Using comprising bottom, middle level and the three-stage on upper strata baking oven during solidifying and setting, the regeneration is gathered The front of acid fiber net is first fed into bottom baking oven after spraying the working solution, and drying temperature is 60-70 DEG C, goes out bottom baking oven The working solution is sprayed to the reverse side of the regeneration acid fiber by polylactic net again afterwards, is then fed into middle level baking oven, drying temperature 80- 90 DEG C, finally shaped in upper strata curing oven, setting temperature is controlled at 90-100 DEG C, go out after baking oven to obtain it is stereotyped it is described again Raw acid fiber by polylactic net；
5）Winding：The stereotyped regeneration acid fiber by polylactic net is wound after trimming, obtains heat-preservation cotton, the guarantor The width of warm cotton is 3.2m, and gel content is 5.5-9.8% in the web of the heat-preservation cotton, raw for the mass percent of fiber Speed is 6-8m/min during production.
As a further improvement on the present invention, it is described to be granulated the melting of PLA leftover bits again, obtain regenerating poly- breast Sour pellet, including：
1）Discarded transparent PLA tailing is crushed, obtain specification length × width × height for (1-4) mm × (2-5) mm × (0.1-0.5) mm PLA crushed material；
2）The PLA crushed material is dried into 5-7h under 60 DEG C of temperature conditionss；
3）Chain extension auxiliary agent, toughener, lubricant and antioxidant are dried into 4-6h under the conditions of 30-40 DEG C；
4）By 0.75-1.2% parts chain extension auxiliary agent, 1-5% parts toughener, 0.2-0.5% parts antioxidant and 0.5-1% parts lubricant is well mixed with the PLA crushed material, is counted using the PLA crushed material as 100 parts Calculate, obtain PLA compound；
5）The PLA compound is sent into double screw extruder, PLA fluid is obtained by melting extrusion, by institute State the nib that PLA fluid via hole diameter is 5 mm to extrude, and the pelletizing after water cooling, acquisition diameter × length are 1.5-3.5mm × 2-4mm regeneration PLA pellet, described each section of temperature setting of double screw extruder is respectively 130-140 DEG C, 150-160 DEG C, 160-170 DEG C, 170-180 DEG C, 160-170 DEG C, the extruded velocity of the PLA fluid is 60-70m/min.
As a further improvement on the present invention, the number-average molecular weight of the regeneration PLA pellet is 8.5-10 ten thousand, fusing point For 152-160 DEG C.
As a further improvement on the present invention, the chain extension auxiliary agent is CHE-4370；The toughener is for stearic acid and firmly The mixture of resin acid calcium, the mixing ratio of stearic acid and calcium stearate is 1 in the toughener:1；The lubricant be oleamide, At least one of erucyl amide；The antioxidant is AS4500.
As a further improvement on the present invention, the line density of the regeneration acid fiber by polylactic is 5-11D, length 51- 65mm, fibrous fracture intensity are 2-3.5cN/dtex, elongation at break 25.8-42.5%, curling number is 20-24/ 25mm。
As a further improvement on the present invention, the grammes per square metre of the heat-preservation cotton is in 120-380g/m2, thickness 34.6- 56.8mm。
Compared with prior art, the preparation method of heat-preservation cotton provided by the invention has advantages below：
1) because present commercialized polylactic acid raw material heat resistance is poor, it is made in spinning, film and follow-up product processing When there is more tailing to produce, the present invention prepares regeneration acid fiber by polylactic for base-material using discarded PLA leftover pieces and is incubated Cotton, precious resources is rationally utilized, widened the application market of poly-lactic acid products, reduce further processing cost.
2) chain extension auxiliary agent, toughener, the antioxidant that the present invention passes through the addition reasonable selection in the crushed material of PLA corner It is 8.5-10 ten thousand to have prepared molecular weight with lubricant, and fusing point is that 152-160 DEG C of spinning-grade regenerates PLA pellet, then normal By lengthening the thermal finalization of acid fiber by polylactic on the basis of rule acid fiber by polylactic spinning technique, further to improve the heat-resisting of fiber Property, and then obtain high-curl-flexibility（It is 20-24/25mm to crimp number）Regeneration acid fiber by polylactic.
3) present invention is handled by carrying out antistatic and upper silicon to regeneration acid fiber by polylactic, fiber regain is reached 7- 10%, surface silicone oil is 0.8-1.5%, is on the one hand advantageous to the shredding and combing of acid fiber by polylactic, on the other hand in poly- breast Sour web glue spraying plays the time that delayed heat is applied to inside acid fiber by polylactic when being heating and curing, so as to protect fabric hand Do not change.
4) present invention is by the selection of the formaldehydeless Environment-friendlyadhesive adhesive of low temperature, the temperature for baking and shaping at 90-100 DEG C, This temperature range will not deform acid fiber by polylactic, web has been remained in that good feel；Simultaneously because adhesive Fountain height acid fiber by polylactic in 5.5-9.8%, web content in 90.2-94.5%, biological degradation rate is more than 90%, complete Full up sufficient European Union EN13432：2000 by it is compound and degraded and reclaim packaging requirement-packaging final acceptance inspection test program and comment Estimate the requirement of the degraded standard of standard.
The present invention by the way that PLA tailing is granulated again, spinning and preparation heat-preservation cotton, utilize PLA rationally While waste material, product cost is further reduced；Prepared regeneration acid fiber by polylactic heat-preservation cotton have insulation, moisture-inhibiting, it is fluffy, The multiple functions such as antibacterial, anti-mite and biodegradation, make poly-lactic acid products more market-oriented and human-orientedization, will for acid fiber by polylactic Petroleum-based polyester fiber, healthy living of bringing benefit to the mankind can be substituted to lay a good foundation.
In summary, the heat-setting time of the invention by lengthening acid fiber by polylactic, antistatic and upper silicon processing is carried out, from And delayed heat is applied to the time inside acid fiber by polylactic, acid fiber by polylactic heat resistance is improved so that the heat-preservation cotton of preparation is abundant Retain the bulkiness and flexibility of acid fiber by polylactic, not only with extraordinary fluffy insulation, moisture-inhibiting vapour and skin-friendly, go back It is the ideal material for making clothes and home textile bed clothes filling cotton with ecological bacteriostatic and anti-mite performance.As a result of PLA Tailing, processing cost is further reduced, make poly-lactic acid products more human-orientedization, there are extraordinary market prospects.
Embodiment
With reference to specific embodiment（But it is not limited to illustrated embodiment) the invention will be further described, wherein chain extender CHE-4370 is purchased from Guangzhou and the prosperous Chemical Industry Science Co., Ltd of that；Oleamide and erucyl amide have purchased from Jiangxi prestige section oil chemistry Limit company；Antioxidant AS4500 is purchased from Tianjin development zone Guo Long Chemical Co., Ltd.s；Stearic acid and calcium stearate are purchased from Shanghai Hao Hua Chemical Co., Ltd.s；Low temperature formaldehyde binder Hansi-T is purchased from Jiangsu Hans Chemicals Co., Ltd.；Antistatic additive SY-794 and hydrophilic silicone oil SY-658 contains hundred million Chemical Co., Ltd.s purchased from Dongguan City.
Embodiment 1
Step 101, the melting of PLA leftover bits is granulated again, obtains regenerating PLA pellet.
Step 102, the regeneration PLA pellet is sent into melt spinning machine after drying, spinning temperature control exists 210-230 DEG C, spinning speed is controlled in 1000-1200m/min, after thermal finalization, curling and cut-out, obtains regenerating PLA Fiber, the thermal finalization are divided into 3rd area, and the heat setting temperature in 3rd area is respectively 118-122 DEG C, 145-148 DEG C, 148-152 DEG C, the heat-setting time in 3rd area amounts to 8-12min.
Step 103, to it is described regeneration acid fiber by polylactic pre-process, then by shredding, mixing, combing, cross lapping, Reinforcing, solidifying and setting, cutting and rolling step, heat-preservation cotton is prepared, including：
1）Pretreatment：Antistatic and upper silicon is carried out using treatment fluid to the regeneration acid fiber by polylactic to handle, and will sprinkling The regeneration acid fiber by polylactic after the treatment fluid covers plastic cloth and boils in a covered pot over a slow fire 24h, makes the regain of the regeneration acid fiber by polylactic Reach 7-10%, surface silicone oil is 0.8-1.5%, and the proportioning of the treatment fluid is antistatic additive：Silicone oil：Water is 8-12%:6- 10%：78-86%；
2）Networking：The pretreated regeneration acid fiber by polylactic is fed to cotton and carding machine comb by shredding, mixing, air-flow Cross lapping machine is sent into after reason, obtains regenerating acid fiber by polylactic net, the number of plies of cross lapping is 3-6 layers, and lapping speed is 28- 32m/min；
3）Reinforce：From the Environment-friendlylow-temperature low-temperature adhesive that solid content is 38-50%, according to adhesive：Water is 1:3-5 ratio Example configuration work liquid, spray the working solution, the four shower nozzles spray gun to the regeneration acid fiber by polylactic net with four shower nozzle spray guns Operating pressure be 2-4.5kgf/cm2, fountain height 14-16g/s；
4）Solidifying and setting：Using comprising bottom, middle level and the three-stage on upper strata baking oven during solidifying and setting, the regeneration is gathered The front of acid fiber net is first fed into bottom baking oven after spraying the working solution, and drying temperature is 60-70 DEG C, goes out bottom baking oven The working solution is sprayed to the reverse side of the regeneration acid fiber by polylactic net again afterwards, is then fed into middle level baking oven, drying temperature 80- 90 DEG C, finally shaped in upper strata curing oven, setting temperature is controlled at 90-100 DEG C, go out after baking oven to obtain it is stereotyped it is described again Raw acid fiber by polylactic net；
5）Winding：The stereotyped regeneration acid fiber by polylactic net is wound after trimming, obtains heat-preservation cotton, the guarantor The width of warm cotton is 3.2m, and gel content is 5.5-9.8% in the web of the heat-preservation cotton（For the mass percent of fiber）, Speed is 6-8m/min during production.
Embodiment 2：
Step 201, the melting of PLA leftover bits is granulated again, obtains regenerating PLA pellet.Including：
1）Discarded transparent PLA tailing is crushed, obtain specification length × width × height for (1-4) mm × (2-5) mm × (0.1-0.5) mm PLA crushed material；
2）The PLA crushed material is dried into 5-7h under 60 DEG C of temperature conditionss；
3）Chain extension auxiliary agent, toughener, lubricant and antioxidant are dried into 4-6h under the conditions of 30-40 DEG C, the chain extension helps Agent is CHE-4370；The toughener is the mixture of stearic acid and calcium stearate, stearic acid and stearic acid in the toughener The mixing ratio of calcium is 1:1；The lubricant is at least one of oleamide, erucyl amide；The antioxidant is AS4500.
4）By 0.75-1.2% parts chain extension auxiliary agent, 1-5% parts toughener, 0.2-0.5% parts antioxidant and 0.5-1% parts lubricant（Calculated using the PLA crushed material as 100 parts）Mixed with the PLA crushed material It is even, obtain PLA compound；
5）The PLA compound is sent into double screw extruder, PLA fluid is obtained after melting extrusion, will The nib that the PLA fluid via hole diameter is 5 mm is extruded, and the pelletizing after water cooling, acquisition diameter × length are 1.5- 3.5mm × 2-4mm regeneration PLA pellet, described each section of temperature setting of double screw extruder is respectively 130-140 DEG C, 150- 160 DEG C, 160-170 DEG C, 170-180 DEG C, 160-170 DEG C, the extruded velocity of the PLA fluid is 60-70m/min, described The number-average molecular weight of regeneration PLA pellet is 8.5-10 ten thousand, and fusing point is 152-160 DEG C.
Step 202, the regeneration PLA pellet is sent into melt spinning machine after drying, spinning temperature control exists 210-230 DEG C, spinning speed is controlled in 1000-1200m/min, after thermal finalization, curling and cut-out, obtains regenerating PLA Fiber, the thermal finalization are divided into 3rd area, and the heat setting temperature in 3rd area is respectively 118-122 DEG C, 145-148 DEG C, 148-152 DEG C, the heat-setting time in 3rd area amounts to 8-12min, and the line density of the regeneration acid fiber by polylactic is 5-11D, and length is 51-65mm, fibrous fracture intensity are 2-3.5cN/dtex, elongation at break 25.8-42.5%, curling number is 20-24/ 25mm。
Step 203, to it is described regeneration acid fiber by polylactic pre-process, then by shredding, mixing, combing, cross lapping, Reinforcing, solidifying and setting, cutting and rolling step, are prepared heat-preservation cotton.Including：
1）Pretreatment：Antistatic and upper silicon is carried out using treatment fluid to the regeneration acid fiber by polylactic to handle, and will sprinkling The regeneration acid fiber by polylactic after the treatment fluid covers plastic cloth and boils in a covered pot over a slow fire 24h, makes the regain of the regeneration acid fiber by polylactic Reach 7-10%, surface silicone oil is 0.8-1.5%, and the proportioning of the treatment fluid is antistatic additive：Silicone oil：Water is 8-12%:6- 10%：78-86%；
2）Networking：The pretreated regeneration acid fiber by polylactic is fed to cotton and carding machine comb by shredding, mixing, air-flow Cross lapping machine is sent into after reason, obtains regenerating acid fiber by polylactic net, the number of plies of cross lapping is 3-6 layers, and lapping speed is 28- 32m/min；
3）Reinforce：From the Environment-friendlylow-temperature low-temperature adhesive that solid content is 38-50%, according to adhesive：Water is 1:3-5 ratio Example configuration work liquid, spray the working solution, the four shower nozzles spray gun to the regeneration acid fiber by polylactic net with four shower nozzle spray guns Operating pressure be 2-4.5kgf/cm2, fountain height 14-16g/s；
4）Solidifying and setting：Using comprising bottom, middle level and the three-stage on upper strata baking oven during solidifying and setting, the regeneration is gathered The front of acid fiber net is first fed into bottom baking oven after spraying the working solution, and drying temperature is 60-70 DEG C, goes out bottom baking oven The working solution is sprayed to the reverse side of the regeneration acid fiber by polylactic net again afterwards, is then fed into middle level baking oven, drying temperature 80- 90 DEG C, finally shaped in upper strata curing oven, setting temperature is controlled at 90-100 DEG C, go out after baking oven to obtain it is stereotyped it is described again Raw acid fiber by polylactic net；
5）Winding：The stereotyped regeneration acid fiber by polylactic net is wound after trimming, obtains heat-preservation cotton, the guarantor The width of warm cotton is 3.2m, and gel content is 5.5-9.8% in the web of the heat-preservation cotton（For the mass percent of fiber）, Speed is 6-8m/min during production, and the grammes per square metre of the heat-preservation cotton is in 120-380g/m2, thickness 34.6-56.8mm.
Embodiment 3：
1st, the selection of auxiliary agent
From 0.75% part of chain extension auxiliary agent CHE-4370（Calculated using PLA crushed material as 100 parts）；1% part of toughness reinforcing Agent, wherein toughener are the mixture of stearic acid and calcium stearate, and the two mixing ratio is 1:1；0.2% part of antioxidant AS4500； 0.5% part of lubricant, wherein lubricant are oleamide.
2nd, the preparation of PLA pellet is regenerated
1）The PLA tailing such as discarded transparent Head material, secondary board particle is crushed, obtains specification length × wide × a height of 1mm × 2 mm × 0.1mm PLA crushed material；
2）PLA crushed material is dried into 5h under the conditions of 60 DEG C；Chain extension auxiliary agent, toughener, lubricant and antioxidant are existed 4h is dried under the conditions of 30 DEG C；
3）Dried chain extension auxiliary agent, toughener, antioxidant and lubricant and PLA crushed material are mixed together uniformly, Be then fed into double screw extruder granulation, the setting of each section of temperature of extruder is respectively 130 DEG C, 150 DEG C, 160 DEG C, 170 DEG C, 160 DEG C, the nib that the PLA fluid via hole diameter after mixed melting is 5 mm is extruded, and extrusion spinline velocity is 60m/min, by water Pelletizing after cold, the regeneration PLA pellet that diameter × length is 1.5mm × 2mm is obtained, number-average molecular weight is 8.5 ten thousand, and fusing point is 152℃。
3rd, spinning
Regeneration PLA pellet is sent into after drying in melt spinning machine, spinning temperature is controlled at 210 DEG C, spinning speed Degree control is 1000m/min, and by the thermal finalization of 3rd area, heat setting temperature is respectively：118 DEG C, 145 DEG C, 148 DEG C, 3rd area heat is fixed The type time amounts to 8min, then after curling and cut-out, and it is 11D to obtain line density, length 65mm, and fibrous fracture intensity is 3cN/dtex, elongation at break 25.8%, curling number are that 20/25mm regenerates acid fiber by polylactic.
4th, the preparation of acid fiber by polylactic heat-preservation cotton is regenerated
1）Pretreatment：Antistatic and upper silicon processing is done to the regeneration acid fiber by polylactic of preparation, the proportioning for the treatment of fluid is anti-quiet Electric agent：Silicone oil：Water is 8%: 6%：86%, after being sprayed to regeneration acid fiber by polylactic, cover plastic cloth and boil in a covered pot over a slow fire 24 hours, make regeneration Acid fiber by polylactic regain reaches 7 %, and surface silicone oil is 0.8%；
2）Networking：Pretreated regeneration acid fiber by polylactic is used into non-woven fabric spray collodion equipment making heat-preservation cotton, passed through Shredding, mixing, air-flow enter cross lapping machine after feeding cotton and carding machine combing, obtain regenerating acid fiber by polylactic net, cross lapping The number of plies be 3 layers, lapping speed is 32m/min；
3）Reinforce：From the Environment-friendlylow-temperature low-temperature adhesive that solid content is 38%, according to adhesive：Water is 1:3 proportional arrangement Working solution, with four shower nozzle spray guns to regeneration acid fiber by polylactic net sprinkling working solution, spray gun operating pressure is 2 kgf/cm2, sprinkling Measure 14g/s；
4）Solidifying and setting：Using comprising bottom, middle level and the three-stage on upper strata baking oven during solidifying and setting, regeneration is being gathered into breast Bottom baking oven is initially entered after sour web front sprinkling working solution, drying temperature is 60 DEG C, is gone out after bottom baking oven again to regeneration Acid fiber by polylactic net reverse side glue spraying, subsequently into middle level baking oven, drying temperature is 80 DEG C, is finally shaped in upper strata curing oven, Setting temperature is controlled at 90 DEG C, and stereotyped regeneration acid fiber by polylactic net is obtained after going out baking oven；
5）Winding：Regeneration acid fiber by polylactic net is wound into heat-preservation cotton after trimming, the width for being incubated lap is 3.2m, gel content is 5.5% in web（For the mass percent of fiber）, speed is 8m/min during production, obtained regeneration PLA heat-preservation cotton grammes per square metre is 120g/m2, thickness 34.6mm.
Embodiment 4：
1st, the selection of auxiliary agent
From 0.95% part of chain extension auxiliary agent CHE-4370（Calculated using PLA crushed material as 100 parts）；3% part of toughness reinforcing Agent, wherein toughener are the mixture of stearic acid and calcium stearate, and the two mixing ratio is 1:1；0.3 % part antioxidant AS4500； 0.8% part of lubricant, wherein lubricant are erucyl amide.
2nd, the preparation of PLA pellet is regenerated
1）The PLA tailing such as discarded transparent Head material, secondary board particle is crushed, obtains specification length × wide × a height of 2.5mm × 3mm × 0.3mm PLA crushed material；
2）PLA crushed material is dried into 6h under the conditions of 60 DEG C；Chain extension auxiliary agent, toughener, lubricant and antioxidant are existed 5h is dried under the conditions of 35 DEG C；
3）Dried chain extension auxiliary agent, toughener, antioxidant and lubricant and PLA crushed material are mixed together uniformly, Be then fed into double screw extruder granulation, the setting of each section of temperature of extruder is respectively 135 DEG C, 155 DEG C, 165 DEG C, 175 DEG C, 165 DEG C, the nib that the PLA fluid via hole diameter after mixed melting is 5 mm is extruded, and extrusion spinline velocity is 65m/min, by water Pelletizing after cold, the regeneration PLA pellet that diameter × length is 2.5mm × 3mm is obtained, number-average molecular weight is 100,000, and fusing point is 160℃。
3rd, spinning
Regeneration PLA pellet is sent into after drying in melt spinning machine, spinning temperature is controlled at 220 DEG C, spinning speed Degree control is 1200m/min, and by the thermal finalization of 3rd area, heat setting temperature is respectively：122 DEG C, 148 DEG C, 152 DEG C, 3rd area heat is fixed The type time amounts to 12min, then after curling and cut-out, and it is 8D to obtain line density, length 64mm, and fibrous fracture intensity is 3.5cN/dtex, elongation at break 42.5%, curling number are that 22/25mm regenerates acid fiber by polylactic.
4th, the preparation of acid fiber by polylactic heat-preservation cotton is regenerated
1）Pretreatment：Antistatic and upper silicon processing is done to the regeneration acid fiber by polylactic of preparation, the proportioning for the treatment of fluid is anti-quiet Electric agent：Silicone oil：Water is 10%：8%：82%, after being sprayed to regeneration acid fiber by polylactic, cover plastic cloth and boil in a covered pot over a slow fire 24h, gather regeneration Acid fiber regain reaches 8.5%, and surface silicone oil is 1.2%；
2）Networking：Pretreated regeneration acid fiber by polylactic is used into non-woven fabric spray collodion equipment making heat-preservation cotton, passed through Shredding, mixing, air-flow enter cross lapping machine after feeding cotton and carding machine combing, obtain regenerating acid fiber by polylactic net, cross lapping The number of plies be 4 layers, lapping speed is 30m/min；
3）Reinforce：From the Environment-friendlylow-temperature low-temperature adhesive that solid content is 45%, according to adhesive：Water is 1:4 ratio is matched somebody with somebody Working solution is put, with four shower nozzle spray guns to regeneration acid fiber by polylactic net sprinkling working solution, spray gun operating pressure is 3.2 kgf/cm2, Fountain height 15g/s；
4）Solidifying and setting：Using comprising bottom, middle level and the three-stage on upper strata baking oven during solidifying and setting, regeneration is being gathered into breast Bottom baking oven is initially entered after sour web front sprinkling working solution, drying temperature is 65 DEG C, is gone out after bottom baking oven again to regeneration Acid fiber by polylactic net reverse side glue spraying, subsequently into middle level baking oven, drying temperature is 85 DEG C, is finally shaped in upper strata curing oven, Setting temperature is controlled at 95 DEG C, and stereotyped regeneration acid fiber by polylactic net is obtained after going out baking oven；
5）Winding：Regeneration acid fiber by polylactic net is wound into heat-preservation cotton after trimming, the width for being incubated lap is 3.2m, gel content is 7.8% in web（For the mass percent of fiber）, speed is 7m/min during production, obtained regeneration PLA heat-preservation cotton grammes per square metre is 250g/m2, thickness 45.2mm.
Embodiment 5：
1st, the selection of auxiliary agent
From 1.2% part of chain extension auxiliary agent CHE-4370（Calculated using PLA crushed material as 100 parts）；5% part of toughener, Wherein toughener is the mixture of stearic acid and calcium stearate, and the two mixing ratio is 1:1；0.5% part of antioxidant AS4500；1% part Lubricant, wherein lubricant are erucyl amide.
2nd, the preparation of PLA pellet is regenerated
1）The PLA tailing such as discarded transparent Head material, secondary board particle is crushed, obtains specification length × wide × a height of 4mm × 5mm × 0.5mm PLA crushed material；
2）PLA crushed material is dried into 7h under the conditions of 60 DEG C；Chain extension auxiliary agent, toughener, lubricant and antioxidant are existed 6h is dried under the conditions of 40 DEG C；
3）Dried chain extension auxiliary agent, toughener, antioxidant and lubricant and PLA crushed material are mixed together uniformly, Be then fed into double screw extruder granulation, the setting of each section of temperature of extruder is respectively 140 DEG C, 160 DEG C, 170 DEG C, 180 DEG C, 170 DEG C, the nib that the PLA fluid via hole diameter after mixed melting is 5 mm is extruded, and extrusion spinline velocity is 70m/min, by water Pelletizing after cold, the regeneration PLA pellet that diameter × length is 3.5mm × 4mm is obtained, number-average molecular weight is 90,000, fusing point 157 ℃。
3rd, spinning
Regeneration PLA pellet is sent into after drying in melt spinning machine, spinning temperature is controlled at 230 DEG C, spinning speed Degree control is 1100m/min, and by the thermal finalization of 3rd area, heat setting temperature is respectively：120 DEG C, 146 DEG C, 150 DEG C, 3rd area heat is fixed The type time amounts to 10min, then after curling and cut-out, and it is 5D to obtain line density, length 51mm, and fibrous fracture intensity is 2.2 cN/dtex, elongation at break are 35.6 %, and curling number is that 24/25mm regenerates acid fiber by polylactic.
4th, the preparation of acid fiber by polylactic heat-preservation cotton is regenerated
1）Pretreatment：Antistatic and upper silicon processing is done to the regeneration acid fiber by polylactic of preparation, the proportioning for the treatment of fluid is anti-quiet Electric agent：Silicone oil：Water is 12%：10%：78%, after being sprayed to regeneration acid fiber by polylactic, cover plastic cloth and boil in a covered pot over a slow fire 24h, gather regeneration Acid fiber regain reaches 10%, and surface silicone oil is 1.5%；
2）Networking：Pretreated regeneration acid fiber by polylactic is used into non-woven fabric spray collodion equipment making heat-preservation cotton, passed through Shredding, mixing, air-flow enter cross lapping machine after feeding cotton and carding machine combing, obtain regenerating acid fiber by polylactic net, cross lapping The number of plies be 6 layers, lapping speed is 28m/min；
3）Reinforce：From the Environment-friendlylow-temperature low-temperature adhesive that solid content is 50%, according to adhesive：Water is 1：5 proportional arrangement Working solution, with four shower nozzle spray guns to regeneration acid fiber by polylactic net sprinkling working solution, spray gun operating pressure is 4.5kgf/cm2, sprinkling Measure 16g/s；
4）Solidifying and setting：Using comprising bottom, middle level and the three-stage on upper strata baking oven during solidifying and setting, regeneration is being gathered into breast Bottom baking oven is initially entered after sour web front sprinkling working solution, drying temperature is 70 DEG C, is gone out after bottom baking oven again to regeneration Acid fiber by polylactic net reverse side glue spraying, subsequently into middle level baking oven, drying temperature is 90 DEG C, is finally shaped in upper strata curing oven, Setting temperature is controlled at 100 DEG C, and stereotyped regeneration acid fiber by polylactic net is obtained after going out baking oven；
5）Winding：Regeneration acid fiber by polylactic net is wound into heat-preservation cotton after trimming, the width for being incubated lap is 3.2m, gel content is 9.8% in web（For the mass percent of fiber）, speed is 6m/min during production, obtained regeneration PLA heat-preservation cotton grammes per square metre is 380g/m2, thickness 56.8mm.
To the regeneration heat insulating ability of acid fiber by polylactic heat-preservation cotton prepared by above three embodiment, penetrability, thickness and fluffy Pine property is tested and assessed, and its result is as shown in table 1.The standard and judgment of wherein method of testing reference is as follows：
（1）Thickness
Using YG（B）141D type digital textile thickness gauge thickness, method of testing are held according to GB/T3820-1997 standards OK.
（2）Vapor transfer rate
Using LCK-131 fabric moisture transmission amount analyzers, tested according to standard GB/T 12704.2-2009.
（3）Warmth retention property
Board-like warming instrument is opened using YG (B) 606D types, tested according to GB1048-89 standards, test cloth specimen specification is 25cm×25cm。
（4）Fluffy degree
Sample is cut into the fritter that area is 20cm*20cm, is weighed after balancing 4h, a flat board is then pressed on sample, in Between add 2000g weights, remove weight after 30s, static 30s, in triplicate after, the height of measure sample corner（It is accurate to 0.5mm）, h is averaged, is calculated according to the following formula：Fluffy degree=(20*20*h/10)/w, wherein, h is sample corner height Average value（mm）；W is the quality of sample（g）.
（5）Biocidal property
Using the Ministry of Public Health《Disinfection technology standard》（2002 editions）2.1.8.7 concussion flask test method is measured
（6）Anti-mite property
According to evaluation-suppression method test of the anti-mite performance of standard GB/T24253-2009 textiles.
Table 1：The test result of heat-preservation cotton
Fluffy degree is directly proportional to the heat insulating ability of material, and fluffy degree is big, shows that the hole in web is more, what is contained is static Air is more, and the heat insulating ability of material is better, on the other hand also contributes to discharge the moisture of interior, as it can be seen from table 1 Regeneration acid fiber by polylactic insulation material prepared by embodiment 3-5 is respectively provided with preferably in terms of heat insulating ability, bulkiness and vapor transfer rate Numerical value, the average value particularly in terms of penetrability will be higher by 15.5% than common commercially available polyester fiber gum sprayed cotton.In addition to gold Staphylococcus aureus and the biocidal property of fungi have also exceeded 81%, and 80% is have also exceeded on the inhibiting rate of dust mite, have preferable Anti-mite effect, and commercially available polyester fiber gum sprayed cotton does not have any antibacterial and anti-mite property.Show insulation provided by the invention Heat-preservation cotton prepared by the preparation method of cotton, no matter have in heat insulating ability, penetrability and antibacterial, anti-mite performance etc. outstanding Performance, it is fully able to meet the new requirement taken with home textile insulation material.
Although being described in detail above with general explanation, embodiment and experiment to the present invention, But on the basis of the present invention, it can be modified or improved, this will be apparent to those skilled in the art.Cause This, these modifications or improvements, belong to the scope of protection of present invention without departing from theon the basis of the spirit of the present invention.

Claims (6)

1. a kind of preparation method of heat-preservation cotton, it is characterised in that methods described includes：
The melting of PLA leftover bits is granulated again, obtains regenerating PLA pellet；
The regeneration PLA pellet is sent into melt spinning machine after drying, spinning temperature is controlled at 210-230 DEG C, is spun Silk speed control is in 1000-1200m/min, after thermal finalization, curling and cut-out, obtains regenerating acid fiber by polylactic, the heat Sizing is divided into 3rd area, and the heat setting temperature in 3rd area is respectively 118-122 DEG C, 145-148 DEG C, 148-152 DEG C, 3rd area Heat-setting time amount to 8-12min；
The regeneration acid fiber by polylactic is pre-processed, then it is fixed by shredding, mixing, combing, cross lapping, reinforcing, solidification Type, cutting and rolling step, heat-preservation cotton is prepared, including：
1）Pretreatment：Antistatic and upper silicon is carried out using treatment fluid to the regeneration acid fiber by polylactic to handle, and by described in sprinkling The regeneration acid fiber by polylactic after treatment fluid covers plastic cloth and boils in a covered pot over a slow fire 24h, reaches the regain of the regeneration acid fiber by polylactic 7-10%, surface silicone oil are 0.8-1.5%, and the proportioning of the treatment fluid is antistatic additive：Silicone oil：Water is 8-12%:6-10%： 78-86%；
2）Networking：By the pretreated regeneration acid fiber by polylactic after shredding, mixing, air-flow feed cotton and carding machine combs Cross lapping machine is sent into, obtains regenerating acid fiber by polylactic net, the number of plies of cross lapping is 3-6 layers, and lapping speed is 28-32m/ min；
3）Reinforce：From the Environment-friendlylow-temperature low-temperature adhesive that solid content is 38-50%, according to adhesive：Water is 1:3-5 ratio is matched somebody with somebody Working solution is put, sprays the working solution, the work of the four shower nozzles spray gun to the regeneration acid fiber by polylactic net with four shower nozzle spray guns It is 2-4.5kgf/cm to make pressure2, fountain height 14-16g/s；
4）Solidifying and setting：Using comprising bottom, middle level and the three-stage on upper strata baking oven during solidifying and setting, by the regeneration PLA The front of web is first fed into bottom baking oven after spraying the working solution, and drying temperature is 60-70 DEG C, is gone out after bottom baking oven again The working solution is sprayed to the reverse side of the regeneration acid fiber by polylactic net, is then fed into middle level baking oven, drying temperature 80-90 DEG C, finally shaped in upper strata curing oven, setting temperature is controlled at 90-100 DEG C, and the stereotyped regeneration is obtained after going out baking oven Acid fiber by polylactic net；
5）Winding：The stereotyped regeneration acid fiber by polylactic net is wound after trimming, obtains heat-preservation cotton, the heat-preservation cotton Width be 3.2m, gel content is 5.5-9.8% in the web of the heat-preservation cotton, for the mass percent of fiber, during production Speed is 6-8m/min.
2. according to the method for claim 1, it is characterised in that it is described to be granulated the melting of PLA leftover bits again, obtain To regeneration PLA pellet, including：
1）Discarded transparent PLA tailing is crushed, it is (1-4) mm × (2-5) to obtain specification length × width × height Mm × (0.1-0.5) mm PLA crushed material；
2）The PLA crushed material is dried into 5-7h under 60 DEG C of temperature conditionss；
3）Chain extension auxiliary agent, toughener, lubricant and antioxidant are dried into 4-6h under the conditions of 30-40 DEG C；
4）By 0.75-1.2% parts chain extension auxiliary agent, 1-5% parts toughener, 0.2-0.5% parts antioxidant and 0.5-1% Part lubricant is well mixed with the PLA crushed material, is calculated, obtained as 100 parts using the PLA crushed material PLA compound；
5）The PLA compound is sent into double screw extruder, PLA fluid is obtained after melting extrusion, by described in The nib that PLA fluid via hole diameter is 5 mm is extruded, and the pelletizing after water cooling, acquisitions diameter × length for 1.5-3.5mm × 2-4mm regeneration PLA pellet, each section of temperature setting of the double screw extruder is respectively 130-140 DEG C, 150-160 DEG C, 160-170 DEG C, 170-180 DEG C, 160-170 DEG C, the extruded velocity of the PLA fluid is 60-70m/min.
3. according to the method for claim 2, it is characterised in that the number-average molecular weight of the regeneration PLA pellet is 8.5- 100000, fusing point is 152-160 DEG C.
4. according to the method for claim 2, it is characterised in that the chain extension auxiliary agent is CHE-4370；The toughener is The mixture of stearic acid and calcium stearate, the mixing ratio of stearic acid and calcium stearate is 1 in the toughener:1；The lubricant For at least one of oleamide, erucyl amide；The antioxidant is AS4500.
5. according to the method for claim 1, it is characterised in that the line density of the regeneration acid fiber by polylactic is 5-11D, long It is 2-3.5cN/dtex to spend for 51-65mm, fibrous fracture intensity, and elongation at break 25.8-42.5%, curling number is 20-24 Individual/25mm.
6. according to the method for claim 1, it is characterised in that the grammes per square metre of the heat-preservation cotton is in 120-380g/m2, thickness is 34.6-56.8mm。
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CN110200443A (en) * 2018-02-28 2019-09-06 马凯娟 A kind of fitted sheet and its manufacture craft of full acid fiber by polylactic
CN109228552A (en) * 2018-08-06 2019-01-18 无锡市明江保温材料有限公司 Regeneration heat preservation cotton material
CN111218730B (en) * 2018-11-26 2022-11-11 安徽丰原生物材料股份有限公司 High-temperature-resistant polylactic acid fiber and preparation method thereof
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