CN103603210B - The reuse method of superfine fiber polyurethane leather mill skin powder - Google Patents
The reuse method of superfine fiber polyurethane leather mill skin powder Download PDFInfo
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- CN103603210B CN103603210B CN201310594474.9A CN201310594474A CN103603210B CN 103603210 B CN103603210 B CN 103603210B CN 201310594474 A CN201310594474 A CN 201310594474A CN 103603210 B CN103603210 B CN 103603210B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
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Abstract
The invention discloses the reuse method of a kind of superfine fiber polyurethane leather mill skin powder, comprise the steps: that superfine fiber polyurethane leather is ground skin dried bean noodles by (1) dry; (2) by dried mill Pi Fenzhong, add DMF and dissolve, keep the DMF solution temperature of mill skin powder at 40 ~ 90 DEG C; (3) the DMF solution for vacuum of mill skin powder step (2) obtained is filtered; (4) step (3) is being obtained, in polyurethane filtrate, adding thickener, obtaining polyurethane solutions; By above-mentioned gained polyurethane solutions, mix in polyurethane impregnated liquid used in combination.The fibre fluff of the present invention to mill skin powder is separated with polyurethane chip, carry out recycling respectively, polyurethane can mix conventional polyurethane impregnated liquid and use after dissolving, thus make polyurethane both decrease mill skin powder to the impact of environment, turn waste into wealth again, reduce the cost of impregnating polyurethane.
Description
Technical field
The present invention relates to the reuse method of a kind of superfine fiber polyurethane leather mill skin powder.
Background technology
China's superfine fiber polyurethane leather industry develop rapidly in recent years, has reached 4,500 ten thousand square metres to the 2008 super fine leather output of annual China in the end of the year.In order to improve the surface effect of superfine fiber polyurethane leather or half-finished flatness, such as neat and well spaced thickness, napping etc. are carried out to super fine suede, the mode of mill skin generally can be adopted to carry out base cloth Final finishing, by mill skin, the outward appearance of base cloth and the indices of feel are very significantly improved, therefore grinding skin is an important manufacturing procedure during synthetic leather is produced.
But, mill skin process can produce a large amount of mill skin powder, containing the fibre fluff such as polyurethane chip (comprising polyurethane resin, filler, colouring agent and auxiliary agent etc.) and polyamide fibre, terylene, cotton in these mill skin powder, the ratio of polyurethane chip and fibre fluff is 3:7 ~ 5:5, and due to the polyurethane resin kind of impregnation in the superfine fiber chemical leather of difference in functionality different, filler, colouring agent and auxiliary agent etc. are not identical yet, make mill skin powder deal with more difficult.These mill skin powder a small amount of are used as the end in footwear except having after adding adhesive and making blocks, major part is dropped, bury or process of burning, the mill skin dust abandoned can cause airborne dust, also sewer can be blocked, not only can cause huge pollution to environment, give and produce and life formation interference, threat is brought to the healthy of people, also result in the waste of resource.Therefore, the problem that mill skin powder has become each microfiber synthetic leather producer how is recycled.
Patent application 02138816.4 discloses a kind of recoverying and utilizing method of Nubuck Synthetic Leather grinding dust, reuses after directly utilizing DMF to be dissolved by polyurethane again.But change in the degree of crystallinity of process Middle molecule and soft hard segments arrangement at polyurethane, and a large amount of various auxiliary agents can be added in production process, and cannot ensure that the composition of the polyurethane reclaimed is with original the same, thus be difficult to ensure that the polyurethane recycled still can produce stable product; And this Nubuck removes from office not containing fibre fluff in dust, can not solve the separation problem of fibre fluff and polyurethane resin in this way.Chinese patent ZL201110199970.5 discloses the reuse method of a kind of polyurethane mill skin chip, adopts polyurethane is ground skin chip to sieve through vibration sieving filter, and polyurethane chip is separated with fibre fluff; Add after DMF mixes in polyurethane chip and obtain mixed liquor, mixed liquor is directly carried out wet impregnation as maceration extract, the method can separate section fibre fluff, is re-used by polyurethane chip.But, because major part mill skin powder dust granules is tiny, grinding at a high speed in skin production process, friction between mill skin powder and sand paper can produce electrostatic, these electrostatic adherence on mill skin dust, and can find out that fibre fluff bends to coccoid under the microscope, and polyurethane chip is being coated in fibre ball, polyurethane chip and fibre fluff are formed reunite, simple shaking-sieving is difficult to the two to separate.
Summary of the invention
The object of this invention is to provide the reuse method of a kind of superfine fiber polyurethane leather mill skin powder, to overcome the defect that prior art exists, realize the recycling of refuse.
The reuse method of superfine fiber polyurethane leather mill skin powder of the present invention, comprises the steps:
(1) superfine fiber polyurethane leather is ground skin powder at 80 ~ 130 DEG C dry 0.5 ~ 10 hour, the moisture in removing mill skin powder and other volatile component;
(2) dried 1 part of mill Pi Fenzhong is added 3 ~ 6 parts of DMFs (DMF), dissolve, keep the DMF solution temperature of mill skin powder at 40 ~ 90 DEG C;
(3) the DMF solution of mill skin powder step (2) obtained filters under vacuum 0 ~-0.098MPa, filter cloth is 80 ~ 160 orders, optionally can select single-stage suction filtration or multistage suction filtration, be separated with polyurethane resin by fibre fluff, the fibre fluff on filter cloth reclaims through DMF and water washing post-drying respectively;
(4) step (3) is obtained adding thickener in polyurethane filtrate, a kind of polyurethane solutions can be obtained;
Described thickener be selected from fume colloidal silica, organobentonite, diatomite, attapulgite or Tissuemat E one or more, the addition of described thickener is in polyurethane solutions, 2% ~ 30% of solid weight;
Because the polyurethane in mill skin powder changes in the degree of crystallinity of the following process process Middle molecule of Ji Bu and soft hard segments arrangement, cannot ensure that the composition of the polyurethane reclaimed is with original the same, above-mentioned gained polyurethane solutions directly uses as maceration extract and is then difficult to ensure still can produce stable product, therefore, preferably above-mentioned gained polyurethane solutions is looked the condition of production, mix in conventional polyurethane slurry to mix and use as maceration extract, incorporation is according to solid part Weight computation, solid part weight in above-mentioned polyurethane solutions accounts for 5% ~ 50% of maceration extract solid part gross weight,
Leather Polyurethane resin slurry that term " conventional polyurethane slurry " refers to non-recycled, that be polymerized via isocyanates and organic polyhydric alcohol.
The fibre fluff of the present invention to mill skin powder is separated with polyurethane chip, carry out recycling respectively, polyurethane can mix conventional polyurethane impregnated liquid and use after dissolving, thus make polyurethane both decrease mill skin powder to the impact of environment, turn waste into wealth again, reduce the cost of impregnating polyurethane.
Detailed description of the invention
Further illustrate the present invention below in conjunction with detailed description of the invention, but therefore do not limit the present invention among described scope of embodiments.
In embodiment, if no special instructions, described part is weight portion.
Embodiment 1
Superfine fiber polyurethane leather is ground skin powder at 80 DEG C dry 10 hours, dried 1 part of mill Pi Fenzhong is added 4.5 parts of DMF, stirs and polyurethane powder is fully dissolved, keep solution temperature at 60 DEG C;
Carry out 80 order suction filtrations under first normal pressure, then under vacuum-0.05MPa, carry out 120 order suction filtrations, be separated by fibre fluff with polyurethane resin, the fibre fluff on filter cloth reclaims through DMF and water washing post-drying respectively;
The fume colloidal silica of solid weight 10% will be added in polyurethane filtrate, be deployed into polyurethane solutions, mix in conventional polyurethane slurry to mix and use as maceration extract, incorporation is according to solid part Weight computation, and the solid part weight in above-mentioned polyurethane solutions accounts for 30% of maceration extract solid part gross weight.
Embodiment 2
Superfine fiber polyurethane leather is ground skin powder at 130 DEG C dry 0.5 hour, dried 1 part of mill Pi Fenzhong is added 3 parts of DMF, stirs and polyurethane powder is fully dissolved, keep solution temperature at 90 DEG C; Under vacuum-0.098MPa, carry out 160 order suction filtrations, be separated by fibre fluff with polyurethane resin, the fibre fluff on filter cloth reclaims through DMF and water washing post-drying respectively;
The Tissuemat E of solid weight 2% will be added in polyurethane filtrate, allotment polyurethane solutions, mix in conventional polyurethane slurry to mix and use as maceration extract, incorporation is according to solid part Weight computation, and the solid part weight in above-mentioned polyurethane solutions accounts for 50% of maceration extract solid part gross weight.
Embodiment 3
Superfine fiber polyurethane leather is ground skin powder at 100 DEG C dry 5 hours, dried 1 part of mill Pi Fenzhong is added 6 parts of DMF, stirs and polyurethane powder is fully dissolved, keep solution temperature at 40 DEG C; Under vacuum-0.08MPa, carry out 120 order suction filtrations, be separated by fibre fluff with polyurethane resin, the fibre fluff on filter cloth reclaims through DMF and water washing post-drying respectively; By in polyurethane filtrate, add the attapulgite of solid weight 30%, be deployed into polyurethane solutions, mix in conventional polyurethane slurry to mix and use as maceration extract, incorporation is according to solid part Weight computation, and the solid part weight in above-mentioned polyurethane solutions accounts for 5% of maceration extract solid part gross weight.
Embodiment 4
Superfine fiber polyurethane leather is ground skin powder at 100 DEG C dry 5 hours, dried 1 part of mill Pi Fenzhong is added 5 parts of DMF, stirs and polyurethane powder is fully dissolved, keep solution temperature at 70 DEG C; Under vacuum-0.08MPa, carry out 100 order suction filtrations, be separated by fibre fluff with polyurethane resin, the fibre fluff on filter cloth reclaims through DMF and water washing post-drying respectively; By in polyurethane filtrate, add the organobentonite of solid weight 15%, be deployed into polyurethane solutions, mix in conventional polyurethane slurry to mix and use as maceration extract, incorporation is according to solid part Weight computation, and the solid part weight in above-mentioned polyurethane solutions accounts for 20% of maceration extract solid part gross weight.
Embodiment 5
Superfine fiber polyurethane leather is ground skin powder at 100 DEG C dry 5 hours, dried 1 part of mill Pi Fenzhong is added 3 parts of DMF, stirs and polyurethane powder is fully dissolved, keep solution temperature at 80 DEG C; Under vacuum-0.09MPa, carry out 120 order suction filtrations, be separated by fibre fluff with polyurethane resin, the fibre fluff on filter cloth reclaims through DMF and water washing post-drying respectively; By in polyurethane filtrate, the diatomite adding solid weight 20% is deployed into uniform and stable polyurethane solutions, then adds colouring agent, bleeding agent, dryingagent etc. and directly use as maceration extract.
In above-described embodiment 1 ~ 4, because the polyurethane solutions reclaimed is impregnated in conventional polyurethane impregnated liquid used in combination, both reduced the production cost of dipping process, do not affected again the performance of gained base cloth, mill skin powder can have been recycled well.And separately the polyurethane solutions of recovery is used as maceration extract in embodiment 5, the sense of gained base cloth flesh is poor, and physical property is unstable.
Claims (4)
1. the reuse method of superfine fiber polyurethane leather mill skin powder, is characterized in that, comprise the steps:
(1) superfine fiber polyurethane leather is ground skin dried bean noodles dry;
(2) by dried 1 part of mill Pi Fenzhong, add 3 ~ 6 parts of DMFs and dissolve, keep the DMF solution temperature of mill skin powder at 40 ~ 90 DEG C;
(3) the DMF solution for vacuum of mill skin powder step (2) obtained is filtered;
(4) step (3) is being obtained, in polyurethane filtrate, adding thickener, obtaining polyurethane solutions; By gained polyurethane solutions, mix in polyurethane impregnated liquid used in combination;
Described thickener be selected from fume colloidal silica, organobentonite, diatomite, attapulgite or Tissuemat E one or more, the addition of described thickener is in polyurethane solutions, 2% ~ 30% of solid weight.
2. method according to claim 1, is characterized in that, in step (1), superfine fiber polyurethane leather is ground skin powder at 80 ~ 130 DEG C dry 0.5 ~ 10 hour.
3. method according to claim 1, is characterized in that, step (3) is last, and filter under the DMF solution for vacuum degree 0 ~-0.098MPa of mill skin powder step (2) obtained, filter cloth is 80 ~ 160 orders.
4. method according to claim 3, is characterized in that, selects single-stage suction filtration or multistage suction filtration, and the fibre fluff on filter cloth reclaims through DMF and water washing post-drying respectively.
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| CN201310594474.9A CN103603210B (en) | 2013-11-21 | 2013-11-21 | The reuse method of superfine fiber polyurethane leather mill skin powder |
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| CN201310594474.9A CN103603210B (en) | 2013-11-21 | 2013-11-21 | The reuse method of superfine fiber polyurethane leather mill skin powder |
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| CN103603210A CN103603210A (en) | 2014-02-26 |
| CN103603210B true CN103603210B (en) | 2015-10-28 |
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| CN104213432B (en) * | 2014-09-26 | 2016-03-16 | 江西豪普高科涂层织物有限公司 | A kind of PU synthetic leather production technology of solid waste regeneration |
| CN113403855A (en) * | 2021-05-27 | 2021-09-17 | 安安(中国)有限公司 | Processing method of spandex recycled filler superfine fiber synthetic leather |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1173569A (en) * | 1997-04-22 | 1998-02-18 | 淮阴工业专科学校 | Method of producing polyurethane synthetic leather by using Concave-convex clay rod as filler |
| CN102031703A (en) * | 2009-09-28 | 2011-04-27 | 浙江阳光思诺再生革有限公司 | Method for producing regenerated leather |
| CN102286886A (en) * | 2011-07-18 | 2011-12-21 | 无锡双象超纤材料股份有限公司 | Method for recycling polyurethane buffed detritus |
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- 2013-11-21 CN CN201310594474.9A patent/CN103603210B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1173569A (en) * | 1997-04-22 | 1998-02-18 | 淮阴工业专科学校 | Method of producing polyurethane synthetic leather by using Concave-convex clay rod as filler |
| CN102031703A (en) * | 2009-09-28 | 2011-04-27 | 浙江阳光思诺再生革有限公司 | Method for producing regenerated leather |
| CN102286886A (en) * | 2011-07-18 | 2011-12-21 | 无锡双象超纤材料股份有限公司 | Method for recycling polyurethane buffed detritus |
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Address after: 201508, No. 888 Ting Wei Road, Shanghai, Jinshan District Patentee after: Shanghai Huafeng Super Fiber Technology Co.,Ltd. Address before: 201508, No. 888 Ting Wei Road, Shanghai, Jinshan District Patentee before: HUAFON MICROFIBRE (SHANGHAI) Co.,Ltd. |