CN107313128A - A kind of PBT fiber fabrication process - Google Patents
A kind of PBT fiber fabrication process Download PDFInfo
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- CN107313128A CN107313128A CN201710667335.2A CN201710667335A CN107313128A CN 107313128 A CN107313128 A CN 107313128A CN 201710667335 A CN201710667335 A CN 201710667335A CN 107313128 A CN107313128 A CN 107313128A
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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
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/68—Polyesters containing atoms other than carbon, hydrogen and oxygen
- C08G63/688—Polyesters containing atoms other than carbon, hydrogen and oxygen containing sulfur
- C08G63/6884—Polyesters containing atoms other than carbon, hydrogen and oxygen containing sulfur derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/6886—Dicarboxylic acids and dihydroxy compounds
-
- 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
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
- D01D5/34—Core-skin structure; Spinnerette packs therefor
-
- 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
- D01F1/09—Addition of substances to the spinning solution or to the melt for making electroconductive or anti-static filaments
-
- 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
- D01F1/103—Agents inhibiting growth of microorganisms
-
- 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
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/12—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyamide as constituent
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Textile Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Multicomponent Fibers (AREA)
Abstract
The invention discloses a kind of PBT fiber fabrication process.The present invention is, by the way that raw material PETP, butanediol, sulfonate and hydrophilic radical copolymerization are obtained modified PBT polyester, and modified PBT polyester slice to be made；Blending is heated with dry metal oxide, PET, PTT in screw extruder obtain blending and modifying PBT spinning melts after modified PBT polyester slice is dried；Core-sheath compound fibre is made using bi-component composite spinning in the spinning solution that blending and modifying PBT spinning melts and aramid fiber polymeric compound are fabricated to.PBT fibers produced by the present invention have good gas permeability, and dyefastness is good；With high resiliency, antibiotic property and excellent chemistry and mechanical performance, and have PTT antistatic property concurrently, and heat resistance is preferable.
Description
Technical field
The present invention relates to fibre manufacturing technology field, more particularly to a kind of PBT fiber fabrication process.
Background technology
With the raising of quality of the life, consumer increasingly carries to the demand of the multifunctional textile product such as comfortable, leisure, attractive in appearance
Height, to meet this demand, increasingly payes attention to the application and exploitation of multifunctional fibre during textile development.Elastomer
In occupation of firm status in world's textile industry, the features such as due to stockinette excellent personal, moulding, elastic fabric is from going out
Now just favored by consumer.
In the 1970s, successful polymerization obtains polybutylene terephthalate (PBT) (PBT) high polymer material, China PET
The yield of fiber 2016 is more than 39,000,000 tons, and PBT fibers only have 100,000 tons；And PET yield in 2010 is more than 25,000,000 tons,
PBT fibers only have 10,000 tons.PBT fibrous elasticities are higher than PET, with good durability, dimensional stability and preferable bullet
Property, and elasticity is not affected by humidity.
Composite spinning is to make the fiber-forming polymer melt of two or more different chemical structures and (or) performance (or molten
Liquid), it is allocated respectively by respective melt (or solution) pipeline, then the composite component combined by polylith distribution plate,
Spinneret is met in a variety of ways, is formed compounding flux (or solution) stream, is sprayed from same spinneret orifice, make fiber-forming polymer
Macromolecular is axially arranged in the spinning process for the fibre section shape being pre-designed along fiber.Also some reports are by two kinds or two kinds
More than polymer with cut into slices or melt in the form of carry out co-blended spinning and obtain the fento fiber type of matrix one method be referred to as it is multiple
Close spinning.Parallel composite fiber and core-sheath compound fibre are especially susceptible to implement to assign fiber new feature, such as core-skin
Type composite fibre, which can be realized, improves hygroscopicity, antistatic behaviour and the performance of permanent curl of fiber, especially useful to improve fibre
The elasticity of dimension.
But, because PBT glass transition temperature is relatively low, in fiber formation process, fiber crystallization rate is faster than PET
10 times, crystallization is begun in spinning cooling procedure, rapid crystallization is caused in the fibre structure of acquisition, and crystallization is imperfect, to rear
Stretching is quite unfavorable, and the dyeing for easily causing finished silk is uneven, while the heat resistance of PBT fibers is poor, limit its
The development of the neighborhoods such as fire-fighting, new characteristic can be brought using the technology of composite spinning to PBT fibers, improve PBT fibers.
The content of the invention
The technical problem existed based on background technology, the present invention proposes a kind of PBT fiber fabrication process.
A kind of PBT fiber fabrication process proposed by the present invention, including following making step:
Raw material PETP, butanediol, sulfonate and hydrophilic radical copolymerization are obtained gathering modified PBT by S1
Ester, and modified PBT polyester slice is made；
S2 is heated after modified PBT polyester slice is dried with dry metal oxide, PET, PTT in screw extruder
Blending obtains blending and modifying PBT spinning melts；
The spinning solution that blending and modifying PBT spinning melts and aramid fiber polymeric compound are fabricated to by S3 uses bi-component composite spinning
Legal system obtains core-sheath compound fibre.
It is preferred that, sulfonate is xyxylene second diester between 5- sodium sulfonates -1,3- in the step S1, and hydrophilic radical is second
Glycol.
It is preferred that, the addition of each component is in the step S1：
PETP:Butanediol is 1:1.3~1:1.7；Xyxylene second diester phase between 5- sodium sulfonates -1,3-
Molar percentage for PETP is 4%~10%；Ethylene glycol relative to PETP
Mass percent is 0.5~2%.
It is preferred that, metal oxide is the 1%~10% of modified PBT polyester quality in the step S2, is nano metal
Oxide, its particle diameter is 100~150nm, and the metal oxide is the mixture of nano zine oxide and silver oxide, wherein aoxidizing
The ratio of zinc and silver oxide is (1~5):1.
It is preferred that, PET additions are for 20%~50%, the PTT additions of modified PBT polyester quality in the step S2
The 20%~50% of modified PBT polyester quality.
It is preferred that, aramid fiber is the ratio of aramid fiber 1313, aramid fiber spinning solution and blending and modifying PBT melts in the step S3
For 1:7~1:1, and blending and modifying PBT melts are core, aramid fiber melt is skin.
It is preferred that, bi-component composite spinning in the step S3, wherein blending and modifying PBT spinning temperature be 270 DEG C~
290 DEG C, the spinning temperature of aramid fiber is 290 DEG C~310 DEG C, and spinning speed is controlled in 800m~1000m/min.
It is preferred that, composite spinning in the step S3 is concretely comprised the following steps：
Step one：Aramid fiber polymeric compound is dissolved in dimethylformamide or dimethyl acetamide, then adds people such as LiCl to make
Cosolvent, is made spinning solution, and spinning is carried out with blending and modifying PBT melt mixeds；
Step 2：, need to be through repeatedly washing, then because as-spun fibre surface carries a large amount of inorganic salts after spinneret spinning
1.1~1.5 times are stretched at 110 DEG C~130 DEG C, and is dried through hot-rolling, draw speed 500m~800m/min, finally at 120 DEG C
Shaped at~150 DEG C.
The beneficial effects of the invention are as follows：
By adding hydrophilic radical ethylene glycol and sulfonic acid group in the feed, the hydrophily of modified PBT can be improved, is made
Obtaining its clothing being made etc. has good gas permeability, while xyxylene second diester between sulfonic acid group 5- sodium sulfonates -1,3-
Addition can promote anionic dye to be dyed, and dyefastness is good.
After modification PBT polyester addition nano-metal-oxide can with the antibiotic property of reinforcing fiber, while with PET, PTT
After blending, can have PET, PTT high resiliency and excellent chemistry and mechanical performance, and have PTT antistatic property concurrently.
By PBT melts after blending and modifying and aramid fiber composite spinning, the composite fibre of skin-core structure is obtained, using aramid fiber as skin,
With preferable heat resistance, while also having the excellent chemistry of modified PBT and mechanical performance concurrently, hygroscopicity, gas permeability are preferable, and
With antibacterial action.
Embodiment
With reference to specific embodiment, the invention will be further described.
A kind of PBT fiber fabrication process, including following making step:
Raw material PETP, butanediol, sulfonate and hydrophilic radical copolymerization are obtained gathering modified PBT by S1
Ester, and modified PBT polyester slice is made；
S2 is heated after modified PBT polyester slice is dried with dry metal oxide, PET, PTT in screw extruder
Blending obtains blending and modifying PBT spinning melts；
The spinning solution that blending and modifying PBT spinning melts and aramid fiber polymeric compound are fabricated to by S3 uses bi-component composite spinning
Legal system obtains core-sheath compound fibre.
Sulfonate is xyxylene second diester between 5- sodium sulfonates -1,3- in the step S1, and hydrophilic radical is ethylene glycol.
Embodiment 1
The addition of each component is in step S1：PETP:Butanediol is 1:1.4；5- sodium sulfonates -1,3-
Between xyxylene second diester relative to PETP molar percentage be 6%；Ethylene glycol relative to benzene two
The mass percent of formic acid second diester is 1%.
Nano-metal-oxide is the 5% of modified PBT polyester quality in step S2, and its particle diameter is 100nm, the metal oxygen
Compound is the mixture of nano zine oxide and silver oxide, and wherein the ratio of zinc oxide and silver oxide is 3:1.
PET additions are that 30%, the PTT additions of modified PBT polyester quality are modified PBT polyester quality in step S2
30%.
Aramid fiber is aramid fiber 1313 in step S3, and the ratio of aramid fiber spinning solution and blending and modifying PBT melts is 1:5, and altogether
Mixed modification PBT melts are core, and aramid fiber melt is skin.
Bi-component composite spinning in step S3, wherein blending and modifying PBT spinning temperature are 285 DEG C, the spinning temperature of aramid fiber
Spend for 300 DEG C, spinning speed is controlled in 1000m/min.
Composite spinning in step S3 is concretely comprised the following steps：
Aramid fiber polymeric compound is dissolved in dimethylformamide, then adds people such as LiCl to make cosolvent, spinning solution is made, with
Blending and modifying PBT melt mixeds carry out spinning；After spinneret spinning, after washing 5 times, then in 130 DEG C of 1.3 times of stretchings, and
Dry, draw speed is 800m/min, finally shaped at 130 DEG C through hot-rolling.
The relevant parameter table of PBT fibers is made：
| Filament number/dtex | 2.0 |
| Fracture strength/(cN/dtex) | 4.5 |
| Short-period used temperature/DEG C | 395 |
| Dyefastness | 4 grades |
| Balance Moisture absorption rate | 7.5% |
Embodiment 2
The addition of each component is in step S1：PETP:Butanediol is 1:1.5；5- sodium sulfonates -1,3-
Between xyxylene second diester relative to PETP molar percentage be 8%；Ethylene glycol relative to benzene two
The mass percent of formic acid second diester is 1.5%.
Nano-metal-oxide is the 5% of modified PBT polyester quality in step S2, and its particle diameter is 150nm, the metal oxygen
Compound is the mixture of nano zine oxide and silver oxide, and wherein the ratio of zinc oxide and silver oxide is 3:1.
PET additions are that 40%, the PTT additions of modified PBT polyester quality are modified PBT polyester quality in step S2
40%.
Aramid fiber is aramid fiber 1313 in step S3, and the ratio of aramid fiber spinning solution and blending and modifying PBT melts is 1:6, and altogether
Mixed modification PBT melts are core, and aramid fiber melt is skin.
Bi-component composite spinning in step S3, wherein blending and modifying PBT spinning temperature are 290 DEG C, the spinning temperature of aramid fiber
Spend for 305 DEG C, spinning speed is controlled in 900m/min.
Composite spinning in step S3 is concretely comprised the following steps：
Aramid fiber polymeric compound is dissolved in dimethylformamide, then adds people such as LiCl to make cosolvent, spinning solution is made, with
Blending and modifying PBT melt mixeds carry out spinning；After spinneret spinning, wash 5 times, then stretch 1.5 times at 150 DEG C, and pass through
Hot-rolling is dried, and draw speed is 800m/min, is finally shaped at 130 DEG C.
The relevant parameter table of PBT fibers is made：
| Filament number/dtex | 1.5 |
| Fracture strength/(cN/dtex) | 4.0 |
| Heat-resisting short-period used temperature/DEG C | 370 |
| Dyefastness | 4.5 level |
| Balance Moisture absorption rate | 8% |
Embodiment 3
The addition of each component is in step S1：PETP:Butanediol is 1:1.4；5- sodium sulfonates -1,3-
Between xyxylene second diester relative to PETP molar percentage be 4%；Ethylene glycol relative to benzene two
The mass percent of formic acid second diester is 2%.
Nano-metal-oxide is the 8% of modified PBT polyester quality in step S2, and its particle diameter is 120nm, the metal oxygen
Compound is the mixture of nano zine oxide and silver oxide, and wherein the ratio of zinc oxide and silver oxide is 5:1.
PET additions are that 50%, the PTT additions of modified PBT polyester quality are modified PBT polyester quality in step S2
50%.
Aramid fiber is aramid fiber 1313 in step S3, and the ratio of aramid fiber spinning solution and blending and modifying PBT melts is 1:3, and altogether
Mixed modification PBT melts are core, and aramid fiber melt is skin.
Bi-component composite spinning in step S3, wherein blending and modifying PBT spinning temperature are 290 DEG C, the spinning temperature of aramid fiber
Spend for 295 DEG C, spinning speed is controlled in 800m/min.
Composite spinning in step S3 is concretely comprised the following steps：
Aramid fiber polymeric compound is dissolved in dimethylformamide, then adds people such as LiCl to make cosolvent, spinning solution is made, with
Blending and modifying PBT melt mixeds carry out spinning；After spinneret spinning, wash 5 times, then stretch 1.3 times at 150 DEG C, and pass through
Hot-rolling is dried, and draw speed is 800m/min, is finally shaped at 150 DEG C.
The relevant parameter table of PBT fibers is made：
| Filament number/dtex | 2.2 |
| Fracture strength/(cN/dtex) | 4.8 |
| Heat-resisting short-period used temperature/DEG C | 380 |
| Dyefastness | 4.5 level |
| Balance Moisture absorption rate | 8.3% |
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (8)
1. a kind of PBT fiber fabrication process, it is characterised in that:Including comprising the following steps that：
Raw material PETP, butanediol, sulfonate and hydrophilic radical copolymerization are obtained modified PBT polyester by S1, and are made
Obtain modified PBT polyester slice；
S2 heats blending with dry metal oxide, PET, PTT after modified PBT polyester slice is dried in screw extruder
Obtain blending and modifying PBT spinning melts；
The spinning solution that blending and modifying PBT spinning melts and aramid fiber polymeric compound are fabricated to by S3 uses bi-component composite spinning legal system
Obtain core-sheath compound fibre.
2. a kind of PBT fiber fabrication process as claimed in claim 1, it is characterised in that：Sulfonate is 5- in the step S1
Xyxylene second diester between sodium sulfonate -1,3-, hydrophilic radical is ethylene glycol.
3. a kind of PBT fiber fabrication process as claimed in claim 1, it is characterised in that：Each component adds in the step S1
Dosage is：
PETP:Butanediol is 1:1.3~~1:1.7；Xyxylene second diester is relative between 5- sodium sulfonates -1,3-
In PETP molar percentage for 4%~~10%；Ethylene glycol relative to PETP
Mass percent be 0.5~~2%.
4. a kind of PBT fiber fabrication process as claimed in claim 1, it is characterised in that：Metal oxide in the step S2
Components by weight percent for modified PBT polyester quality 1%~~10%, be nano-metal-oxide, its particle diameter be 100~~
150nm, the metal oxide is the mixture of nano zine oxide and silver oxide, and wherein the ratio of zinc oxide and silver oxide is (1
~~5):1.
5. a kind of PBT fiber fabrication process as claimed in claim 1, it is characterised in that：PET additions are in the step S2
The 20% of modified PBT polyester quality~~50%, PTT additions for modified PBT polyester quality 20%~~50%.
6. a kind of PBT fiber fabrication process as claimed in claim 1, it is characterised in that：Aramid fiber is aramid fiber in the step S3
1313, the ratio of aramid fiber spinning solution and blending and modifying PBT melts is 1:7~~1:1, and blending and modifying PBT melts are core, virtue
Synthetic fibre melt is skin.
7. a kind of PBT fiber fabrication process as described in claim 1 or 6, it is characterised in that：Bi-component is answered in the step S3
Close spinning, wherein blending and modifying PBT spinning temperature be 270 DEG C~~290 DEG C, the spinning temperature of aramid fiber for 290 DEG C~~310
DEG C, spinning speed is controlled in 800m~1000m/min.
8. a kind of PBT fiber fabrication process as described in claim 1,6 or 7, it is characterised in that：It is compound in the step S3
Spinning is concretely comprised the following steps：
Step one：Aramid fiber polymeric compound is dissolved in dimethylformamide or dimethyl acetamide, then adds people such as LiCl to make hydrotropy
Agent, is made spinning solution, and spinning is carried out with blending and modifying PBT melt mixeds；
Step 2：, need to be through repeatedly washing, then 110 because as-spun fibre surface carries a large amount of inorganic salts after spinneret spinning
DEG C~130 DEG C of 1.1~1.5 times of stretchings, and dried through hot-rolling, draw speed 500m~800m/min, finally 120 DEG C~150
Shaped at DEG C.
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Cited By (8)
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| CN108085778A (en) * | 2017-12-04 | 2018-05-29 | 杭州奔马化纤纺丝有限公司 | A kind of anti pilling easily super imitative cotton modified short fiber of dye and preparation method thereof |
| CN109234846A (en) * | 2018-10-11 | 2019-01-18 | 江苏江南高纤股份有限公司 | The preparation method of Kang Shu composite short fiber |
| CN110306270A (en) * | 2019-07-22 | 2019-10-08 | 南通汉卓纺织科技有限公司 | A kind of preparation method of the ventilative three-dimensional complex yarn of moisture absorption |
| CN112080812A (en) * | 2020-08-28 | 2020-12-15 | 烟台泰和新材料股份有限公司 | Comfortable meta-aramid fiber and preparation method thereof |
| CN112812373A (en) * | 2021-01-13 | 2021-05-18 | 江西龙泰新材料股份有限公司 | High-strength conductive aramid fiber core material and forming process thereof |
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| CN114000225A (en) * | 2021-10-08 | 2022-02-01 | 仪征市星海化纤有限公司 | Preparation process of PBT (polybutylene terephthalate) heat-preservation polyamide high stretch yarn |
| KR20220091229A (en) * | 2020-12-23 | 2022-06-30 | 도레이첨단소재 주식회사 | Heat sealable thermal adhesive aramid conjugated fiber, Method for producting the same and Non-woven fabric comprising the same |
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| CN110306270A (en) * | 2019-07-22 | 2019-10-08 | 南通汉卓纺织科技有限公司 | A kind of preparation method of the ventilative three-dimensional complex yarn of moisture absorption |
| CN110306270B (en) * | 2019-07-22 | 2022-04-05 | 南通汉卓纺织科技有限公司 | Preparation method of moisture-absorbing and breathable three-dimensional composite yarn |
| CN112080812A (en) * | 2020-08-28 | 2020-12-15 | 烟台泰和新材料股份有限公司 | Comfortable meta-aramid fiber and preparation method thereof |
| CN112080812B (en) * | 2020-08-28 | 2023-11-21 | 泰和新材集团股份有限公司 | Comfort meta-aramid fiber and preparation method thereof |
| KR20220091229A (en) * | 2020-12-23 | 2022-06-30 | 도레이첨단소재 주식회사 | Heat sealable thermal adhesive aramid conjugated fiber, Method for producting the same and Non-woven fabric comprising the same |
| KR102525133B1 (en) | 2020-12-23 | 2023-04-21 | 도레이첨단소재 주식회사 | Heat sealable thermal adhesive aramid conjugated fiber, Method for producting the same and Non-woven fabric comprising the same |
| CN112812373A (en) * | 2021-01-13 | 2021-05-18 | 江西龙泰新材料股份有限公司 | High-strength conductive aramid fiber core material and forming process thereof |
| CN112981610A (en) * | 2021-03-08 | 2021-06-18 | 江苏江南高纤股份有限公司 | Environment-friendly hydrophilic low-melting-point PET composite short fiber and preparation method thereof |
| CN114000225A (en) * | 2021-10-08 | 2022-02-01 | 仪征市星海化纤有限公司 | Preparation process of PBT (polybutylene terephthalate) heat-preservation polyamide high stretch yarn |
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