CN102383315A - Preparation method for superfine-fiber elastic base cloth - Google Patents
Preparation method for superfine-fiber elastic base cloth Download PDFInfo
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- CN102383315A CN102383315A CN2010102719035A CN201010271903A CN102383315A CN 102383315 A CN102383315 A CN 102383315A CN 2010102719035 A CN2010102719035 A CN 2010102719035A CN 201010271903 A CN201010271903 A CN 201010271903A CN 102383315 A CN102383315 A CN 102383315A
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Abstract
The invention relates to a preparation method for superfine-fiber elastic base cloth. The preparation method comprises the following steps of: (1) dipping sea-island fiber non-woven cloth in DMF (dimethyl formamide) solution of polyurethane added with carbonate and organic acid; (2) soaking a semi-finished product obtained in the step (1) in the DMF solution, carrying out solidification and foaming treatment, and preparing the polyurethane component into elastomers containing foam holes; (3) washing; (4) using an organic solvent to dissolve off 'sea' parts in the sea-island fibers; and (5) drying and setting. According to the preparation method, in the solidification process of the polyurethane, a solvent DMF in polyurethane slurry generates exchange with water in solidified liquid, and is moved into the solidified liquid so as to generate physical foaming micropores; and simultaneously, when the mixture of the carbonate and the organic acid meets water, the organic acid is dissociated to generate H+ ions which react with the carbonate to generate CO2 gas, so that resin generates chemical foaming micropores, the microporous structure of a polyurethane sponge body can be adjusted, the foam holes are improved and added and the polyurethane sponge body is full and elastic.
Description
Technical field
The invention belongs to the synthetic leather manufacturing technology, relate to a kind of manufacturing approach of synthetic leather base cloth, a kind of preparation method of superfine fibre elastic base fabric.
Background technology
International major companies such as last century five, sixties du pont company, Japanese Kuraray, Japanese Teijin Ltd are from researching and developing superfine fibre and achieving success; Form industrialization, wherein Japanese Kuraray Co., Ltd. takes the lead in developing superfine fiber chemical leather and industrialization.Superfine fiber chemical leather is the expensive goods of world today's synthetic leather industry, and manufacturing requirements is very high, and its product has soft and full, air-moisture-permeable, and performance such as intensity is high and comfortable and easy to wear is represented the developing direction of synthetic leather industry.
Ultra fine base cloth is as the end base of microfiber synthetic leather, and it has directly determined the rerum natura and the feel of microfiber synthetic leather.For the feel of ultra fine base cloth; Because the fibre fineness of PA6 is below 0.01 DENIER in the ultra fine base cloth; Can reach soft effect, and will make microfiber synthetic leather have characteristics such as plumpness, the structure of polyurethane foam cavernous body is most important factor.The structure of polyurethane sponge body is mainly regulated through physical methods such as mechanical bubbling and change coagulation regulator, solidification liquid concentration and setting temperatures at present.These methods are mainly through arrangement that changes polyurethane molecular in the process of setting and the feel that the polyurethane foam degree is regulated the polyurethane sponge body.Owing to only regulate the unicity of the mode of cavernous structure, so display in the limitation that further improves aspect the plentiful and elastic handfeel of ultra fine base cloth with physical method.
Summary of the invention
The present invention is intended to propose a kind of preparation method of new superfine fibre elastic base fabric, utilizes the method for physical blowing and chemical blowing to regulate polyurethane sponge body microcellular structure simultaneously, thereby obtains good hand feeling and the ultra fine base cloth of rubber-like.
The preparation method of this superfine fibre elastic base fabric may further comprise the steps:
(1) the islands-in-sea type fibre nonwoven fabric is flooded in containing DMF (dimethyl formamide) solution of carbonate and organic acid polyurethane;
(2) (1) step gained semi-products are soaked in the aqueous solution of DMF, polyurethane is solidified and carry out physics and chemical blowing, wherein chemical blowing is that organic acid is met hydrolytic dissociation and produced H
+Ion produces CO with carbonate reaction again
2Gas and foaming is processed the polyurethane composition on the elastomer that contains the microvesicle hole;
(3) washing;
(4) dissolve with organic solvent and go " sea " part in the islands-in-sea type fibre;
(5) dry, setting.
The preparation method of this superfine fibre elastic base fabric; Owing in polyurethane DMF solution, added carbonate and organic acid; When the semi-products that will flood polyurethane soak in the aqueous solution of solidification liquid DMF, produced two processes of physical blowing and chemical blowing simultaneously: in the polyurethane process of setting, solvent DMF in the polyurethane slurry and the water in the solidification liquid exchange; And move in the solidification liquid, produce the physical blowing micropore; Simultaneously, carbonate and organic acid mixture are after running into water, and the organic acid disassociation produces H
+Ion with carbonate reaction, produces CO
2Gas makes resin expandedly, produces the chemical blowing micropore; In addition, course of reaction is followed the consumption of polcarb filler, also produces the physics micropore.This method utilizes the method for physics and chemical blowing to regulate polyurethane sponge body microcellular structure simultaneously, improves and the increase abscess, makes the polyurethane sponge body plentiful and flexible.
The specific embodiment
The preparation method of this superfine fibre elastic base fabric may further comprise the steps:
(1) the islands-in-sea type fibre nonwoven fabric is flooded in containing carbonate and organic acid polyurethane DMF solution.
(2) (1) step gained semi-products are soaked in the aqueous solution of solidification liquid DMF, polyurethane is solidified and carry out physics and chemical blowing, the polyurethane composition is processed the elastomer that contains the microvesicle hole.Foaming process is: the first, and in the polyurethane process of setting, solvent DMF in the polyurethane slurry and the water in the solidification liquid exchange, and move in the solidification liquid, produce the physical blowing micropore; The second, disassociation produced H after organic acid ran into water
+Ion produces CO with carbonate reaction
2Gas makes resin expanded generation chemical blowing micropore; The 3rd, course of reaction is followed the consumption of polcarb filler, produces the physics micropore.
(3) washing.
(4) dissolve with organic solvent and go " sea " part in the islands-in-sea type fibre.
(5) dry, setting.
Among the preparation method of this superfine fibre elastic base fabric, carbonate can be calcium carbonate or magnesium carbonate in the time of described in (1) step, preferred calcium carbonate.The addition of calcium carbonate is the 50%-120% of the polyurethane solid masses in the polyurethane DMF solution.Described organic acid can be formic acid, acetate or ethanedioic acid, preferable formic acid.The addition of formic acid count with molal quantity the carbonate addition molal quantity 50%～180%.Adopt such additional proportion, the excessive existence of calcium carbonate, reaction back organic acid does not have residual basically, can avoid organic acid that production equipment is produced corrosiveness.
Among the preparation method of this superfine fibre elastic base fabric; Islands-in-sea type fibre nonwoven fabric described in (1) step can be to be processed through the method that acupuncture and high temperature plate by the staple fibre that polyethylene (PE)/nylon 6 (PA6) bi-component is processed through melt spinning, and described dipping is through the synthetic polyurethane of solution polymerization process by polyalcohol, chain extender and isocyanates with polyurethane; Organic solvent described in (4) step is a toluene.
Among the preparation method of this superfine fibre elastic base fabric; The filament number of " island " part nylon fiber can be 0.0005～0.01 DENIER in the islands-in-sea type fibre; In the manufacturing process of described nonwoven fabric, the islands-in-sea type fibre needling density can be 500～3000 pins/cm
2, the pressing temperature range when nonwoven fabric prepares is 80～155 ℃.
Among the preparation method of this superfine fibre elastic base fabric; Described polyalcohol can be the PEPA of 600-3000 for molecular weight, also can be that molecular weight is that PPG and the molecular weight of 600-3000 is the PEPA of 600-3000, and described chain extender is ethylene glycol or 1; 4 butanediols; Described isocyanates is 4,4-diphenyl methane-2-isocyanates, and the mass percent concentration of the polyurethane DMF solution of described dipping usefulness can be 13%～25%.
PPG among the preparation method of this superfine fibre elastic base fabric can be PolyTHF, polypropylene oxide glycol or PEO glycol; Described PEPA can be the polyethylene glycol adipate glycol, gather adipic acid 1,4-butanediol ester glycol or polycaprolactone glycol.
The concentration of the aqueous solution of used solidification liquid DMF is mass percent concentration 15%-50% among the preparation method of this superfine fibre elastic base fabric.
Preparation method's detailed process of superfine fibre elastic base fabric of the present invention is following:
(1) preparation of islands-in-sea type fibre nonwoven fabric:
(1), with two kinds of inconsistent macromolecular material PA6 and PE according to 50～70: 50～30 mass ratios are processed islands-in-sea bicomponent fibre through the technology of melt spinning; Process the thin dawn long fiber of fineness 5～7 DENIERs then through the back spinning technique, and this long fiber is cut into the staple fibre that length is 3cm～8cm;
(2), adopt the needle punched non-woven fabrics technology, it is 0.20～0.35g/cm that above-mentioned staple fiber is obtained apparent density through shredding, combing, lapping, acupuncture and pressing technology
3, thickness is that nonwoven fabric is used in the impregnation of 1.5～4.5mm.
(2) preparation of impregnation slurry (polyurethane DMF solution):
(1), adopts solution polymerization process; Under 50 ℃～85 ℃; In the DMF solvent be 600～3000 polyethers, polyester, ethylene glycol or 1,4 butanediol and 4 with molecular weight, the synthetic solid content of 4-diphenyl methane-2-isocyanates is that 20%～30% dipping is used the polyurethane high molecule material.
(2), the mixture with calcium carbonate and formic acid adds in the polyurethane solutions of going up the step gained; Using DMF is 13%～25% with mixture diluted to polyurethane content; Stir; Process the impregnation slurry, wherein the addition of calcium carbonate is 50%～120% of a polyurethane solid masses, and the formic acid addition is the 50%-180% of carbonate molar weight.
(3) impregnation, foaming and molten " sea " composition that goes:
(1), the impregnation slurry is impregnated in the prepared nonwoven fabric of (one) step, the control pickup makes the content of polyurethane elastomer account for 25%～65% of ultra fine base cloth quality.
(2) with complete impregnation good base cloth immerse in 15%～50%DMF aqueous solution, solidify foaming.
(3), will solidify in the toluene that base cloth after the foaming immerses 65 ℃～85 ℃, extract " sea " component in the islands-in-sea type fibre out, obtain the nylon fiber that filament number is 0.0005～0.01 DENIER.
(4), handle and dryness finalization, obtain the resilient ultra fine base cloth of good hand feeling, the fibre single thread fiber number is 0.0005～0.01 DENIER with softener.
Method of the present invention can be regulated polyurethane sponge body microcellular structure through the control filer content, makes the polyurethane sponge body produce the micropore of dissimilar structures, designs the ultra fine base cloth of elasticity of different feels.Through adjusting elastic polyurethane body burden and polyurethane sponge body microcellular structure simultaneously, make ultra fine base cloth under elastic polyurethane body burden condition with higher, can produce more abscess, make ultra fine base cloth have both high elasticity and good plentiful softness.Also can increase ultra fine base cloth density, thereby strengthen solid sense and dangle sense, make that good hand feeling is substantial and flexible, obtain the feel of similar corium through adding the excess calcium carbonate filler.
Introduce embodiment below:
Embodiment 1
(1) preparation of islands-in-sea type fibre nonwoven fabric:
The employing ratio is that 60: 40 PA6 and PE blend melt spinning processed islands-in-sea type fibre, and through spinning technique later above-mentioned islands-in-sea type fibre to be processed fineness be 5～7 DENIERs, and length is the staple fibre of 3cm～8cm; Utilize the needle punched non-woven fabrics technology that above-mentioned staple fibre is processed eedle-punched non-wovens, needling density 1000 pins/cm
2, process the ultra fine nonwoven fabric that thickness is 1.8mm through 145 ℃ of pressings again.
(2) preparation of impregnation slurry (polyurethane DMF solution):
Adopting solution polymerization process, under 50 ℃～85 ℃, in the DMF solvent is 2000 PolyTHF and polycaprolactone glycol (1: 1) with molecular weight, and it is 30% polyurethane resin that ethylene glycol and 4,4-diphenyl methane-2-isocyanates synthesize solid content.15Kg calcium carbonate with after 12.4Kg formic acid evenly mixes, is joined in the 100Kg polyurethane resin that has prepared, add 2.6KgDMF again, be mixed with resin content and be 23% impregnation and use slurry.
(3) impregnation, foaming and molten " sea " composition that goes:
Be pressed into the impregnation slurry in the nonwoven fabric uniformly with pressure roller; In 50 ℃, concentration are 50% the DMF aqueous solution, solidify, foam, and clean the DMF in the base cloth with 80 ℃ hot water; In 80 ℃ toluene is bathed, extract PE out then, again through chemical softening and dryness finalization, promptly process have multistage microvoid polyurethane cavernous body the superfine fibre elastic base fabric.
The prepared base cloth elastic polyurethane of present embodiment body burden is high, and abscess is more, and good hand feeling and flexible is applicable to the not busy footwear of sport footwear and body.
Embodiment 2
(1) preparation of islands-in-sea type fibre nonwoven fabric:
The employing ratio is that 55: 45 PA6 and PE blend melt spinning processed islands-in-sea type fibre, and through spinning technique later above-mentioned islands-in-sea type fibre to be processed fineness be 5～7 DENIERs, and length is the staple fibre of 3cm～8cm; Utilize the needle punched non-woven fabrics technology that above-mentioned staple fibre is processed eedle-punched non-wovens, needling density 600 pins/cm
2, process the ultra fine nonwoven fabric that thickness is 1.5mm through 135 ℃ of pressings again.
(2) preparation of impregnation slurry (polyurethane DMF solution):
Adopting solution polymerization process, under 50 ℃～85 ℃, in the DMF solvent is 2000 polycaprolactone glycol with molecular weight, and ethylene glycol and 4, the synthetic solid content of 4-diphenyl methane-2-isocyanates are 25% polyurethane resin.30Kg calcium carbonate with after 26.2Kg formic acid evenly mixes, is added in the above-mentioned 100Kg polyurethane resin for preparing.It is that slurry is used in 13% impregnation as resin content that said mixture uses 36KgDMF dilution.
(3) impregnation, foaming and molten " sea " composition that goes:
Be pressed into the impregnation slurry in the nonwoven fabric uniformly with pressure roller; In 30 ℃, the concentration 45%DMF aqueous solution, solidify, foam; And with the DMF in 80 ℃ the hot water cleaning base cloth; In 80 ℃ toluene is bathed, extract PE out then, again through chemical softening and dryness finalization, promptly process have multistage microvoid polyurethane cavernous body the superfine fibre elastic base fabric.
The base cloth elastic polyurethane body burden that present embodiment makes is few, and abscess is many, and base cloth thickness is less, and is soft flexible, is applicable to fancy leather.
Embodiment 3
(1) preparation of islands-in-sea type fibre nonwoven fabric:
The employing ratio is that 50: 50 PA6 and PE blend melt spinning processed islands-in-sea type fibre, and through spinning technique later above-mentioned islands-in-sea type fibre to be processed fineness be 5～7 DENIERs, and length is the staple fibre of 3cm～8cm; Utilize the needle punched non-woven fabrics technology that above-mentioned staple fibre is processed eedle-punched non-wovens, needling density 1200 pins/cm
2, process the ultra fine nonwoven fabric of thickness 1.8mm again through 145 ℃ of pressings.
(2) preparation of impregnation slurry (polyurethane DMF solution):
Adopt solution polymerization process; Under 50 ℃～85 ℃; In the DMF solvent, be that 3000 polypropylene oxide glycol and molecular weight are 2000 polyethylene glycol adipate glycol (mass ratio 2: 1) and ethylene glycol and 4 with molecular weight, the synthetic solid content of 4-diphenyl methane-2-isocyanates is 30% polyurethane resin.In above-mentioned every 100Kg polyurethane resin, add calcium carbonate 20Kg, add formic acid 9.2Kg, wherein calcium carbonate mixes with formic acid earlier, adds in the polyurethane resin again.It is that slurry is used in 20% impregnation as resin content that said mixture uses 20.8KgDMF dilution.
(3) impregnation, foaming and molten " sea " composition that goes:
Be pressed into the impregnation slurry in the nonwoven fabric uniformly with pressure roller; In 30 ℃, the 45%DMF aqueous solution, solidify, foam; And with the DMF in 80 ℃ the hot water cleaning base cloth; In 80 ℃ toluene is bathed, extract PE out then, promptly process superfine fibre elastic base fabric through chemical softening and dryness finalization again with multistage microvoid polyurethane cavernous body.
The base cloth elastic polyurethane body burden that present embodiment makes is many, and abscess is many, and stays a large amount of pearl fillers, and density is high, and solid sense is strong, makes that feel is substantial and flexible, is applicable to footwear leather etc.
Embodiment 4
(1) preparation of islands-in-sea type fibre nonwoven fabric:
The employing ratio is that 50: 50 PA6 and PE blend melt spinning processed islands-in-sea type fibre, and through spinning technique later above-mentioned islands-in-sea type fibre to be processed fineness be 5～7 DENIERs, and length is the staple fibre of 3cm～8cm; Utilize the needle punched non-woven fabrics technology that above-mentioned staple fibre is processed eedle-punched non-wovens, needling density 1500 pins/cm
2, process the ultra fine nonwoven fabric that thickness is 3.0mm through 155 ℃ of pressings again.
(2) preparation of impregnation slurry (polyurethane DMF solution):
Adopt solution polymerization process; Under 50 ℃～85 ℃; In the DMF solvent, be 2000 PolyTHF and poly adipate succinic acid ester glycol (mass ratio 2: 1) and 1,4 butanediol and 4 with molecular weight, the synthetic solid content of 4-diphenyl methane-2-isocyanates is 30% polyurethane resin.In above-mentioned every 100Kg polyurethane resin, the adding calcium carbonate quantity is 20Kg, and adding the ethanedioic acid amount is 10.2Kg, and wherein calcium carbonate mixes with ethanedioic acid earlier, adds and advances in the polyurethane resin.It is that slurry is used in 20% impregnation as resin content that said mixture uses 19.8KgDMF dilution.
(3) impregnation, foaming and molten " sea " composition that goes:
Be pressed into the impregnation slurry in the nonwoven fabric uniformly with pressure roller; In 40 ℃, the 30%DMF aqueous solution, solidify, foam; And with the DMF in 80 ℃ the hot water cleaning base cloth; In 80 ℃ toluene is bathed, extract PE out then, promptly process superfine fibre elastic base fabric through chemical softening and dryness finalization again with multistage microvoid polyurethane cavernous body.
The base cloth thickness that present embodiment makes reaches 2.2mm, and density is high, and solid sense is strong, makes that feel is substantial and flexible, is applicable to furniture decoration leather that thickness and rerum natura are had relatively high expectations etc.
Claims (9)
1. the preparation method of a superfine fibre elastic base fabric may further comprise the steps:
(1) the islands-in-sea type fibre nonwoven fabric is flooded in the DMF of polyurethane solution;
(2) (1) step gained semi-products are soaked in the aqueous solution of solidification liquid DMF, solidify and foaming treatment, polyurethane is processed the elastomer that contains the microvesicle hole;
(3) washing;
(4) dissolve with organic solvent and go " sea " part in the islands-in-sea type fibre;
(5) dry, setting;
It is characterized in that in (1) step, being added with carbonate and organic acid in the described polyurethane DMF solution, the foaming process described in (2) step comprises that the hydrolytic dissociation of organic acid chance produces H
+Ion, produce CO with carbonate reaction again
2The chemical blowing process of gas.
2. the preparation method of superfine fibre elastic base fabric as claimed in claim 1; It is characterized in that the carbonate described in (1) step is calcium carbonate; The addition of calcium carbonate is the 50%-120% of the polyurethane solid masses in the polyurethane DMF solution; Described organic acid is a formic acid, the addition of formic acid count with molal quantity the carbonate addition molal quantity 50%～180%.
3. the preparation method of superfine fibre elastic base fabric as claimed in claim 2; It is characterized in that the islands-in-sea type fibre nonwoven fabric described in (1) step is to be processed through the method that acupuncture and high temperature plate by the staple fibre that polyethylene and nylon 6 bi-components are processed through melt spinning, described dipping is through the synthetic polyurethane of solution polymerization process by polyalcohol, chain extender and isocyanates with polyurethane; Organic solvent described in (4) step is a toluene.
4. the preparation method of superfine fibre elastic base fabric as claimed in claim 3; The filament number that it is characterized in that " island " part nylon fiber in the described islands-in-sea type fibre is 0.0005～0.01 DENIER, and the islands-in-sea type fibre needling density of described nonwoven fabric is 500～3000 pins/cm
2, the pressing temperature range when nonwoven fabric prepares is 80～155 ℃.
5. the preparation method of superfine fibre elastic base fabric as claimed in claim 4; It is characterized in that described polyalcohol is that molecular weight is that PPG and the molecular weight of 600-3000 is the PEPA of 600-3000; Described chain extender is ethylene glycol or 1,4 butanediol, and described isocyanates is 4; 4-diphenyl methane-2-isocyanates, the mass percent concentration of the DMF solution of the polyurethane that described dipping uses is 13%～25%.
6. the preparation method of superfine fibre elastic base fabric as claimed in claim 4; It is characterized in that described polyalcohol is that molecular weight is the PEPA of 600-3000; Described chain extender is ethylene glycol or 1,4 butanediol, and described isocyanates is 4; 4-diphenyl methane-2-isocyanates, the mass percent concentration of the DMF solution of the polyurethane that described dipping uses is 13%～25%.
7. the preparation method of superfine fibre elastic base fabric as claimed in claim 5 is characterized in that described PPG is a PolyTHF, and described PEPA is a polycaprolactone glycol.
8. the preparation method of superfine fibre elastic base fabric as claimed in claim 5 is characterized in that described PPG is the PEO glycol; Described PEPA polyethylene glycol adipate glycol.
9. the preparation method of superfine fibre elastic base fabric as claimed in claim 5 is characterized in that the concentration of the aqueous solution of the solidification liquid DMF described in (2) step is mass percent concentration 15%-50%.
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Cited By (7)
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| CN106220823A (en) * | 2016-08-29 | 2016-12-14 | 山东凯仕利合成材料科技股份有限公司 | Low bullet foamless polyurethane and the imitative Corii Bovis seu Bubali microfiber synthetic leather with it as raw material production |
| CN108963162A (en) * | 2018-07-27 | 2018-12-07 | 宁德卓高新材料科技有限公司 | The method for preparing micropore ceramics diaphragm |
| CN108987651A (en) * | 2018-07-27 | 2018-12-11 | 江苏卓高新材料科技有限公司 | A method of preparing micropore ceramics composite diaphragm |
| CN110965335A (en) * | 2019-12-27 | 2020-04-07 | 江苏华峰超纤材料有限公司 | Polyurethane resin immersion liquid and microfiber base fabric for intelligent temperature-adjusting clothes and preparation method |
| CN112501918A (en) * | 2021-01-11 | 2021-03-16 | 禾欣可乐丽超纤皮(嘉兴)有限公司 | Novel method for adjusting micropores of microfiber base cloth membrane by polyurethane wet method |
| CN114086401A (en) * | 2021-12-09 | 2022-02-25 | 江苏华峰超纤材料有限公司 | Preparation method of waterborne polyurethane leather-imitated superfine fiber synthetic leather base cloth |
| CN114645460A (en) * | 2022-01-26 | 2022-06-21 | 合肥科天水性科技有限责任公司 | Preparation method of waterborne polyurethane high-physical-property high-density space leather base |
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| CN106220823A (en) * | 2016-08-29 | 2016-12-14 | 山东凯仕利合成材料科技股份有限公司 | Low bullet foamless polyurethane and the imitative Corii Bovis seu Bubali microfiber synthetic leather with it as raw material production |
| CN108963162A (en) * | 2018-07-27 | 2018-12-07 | 宁德卓高新材料科技有限公司 | The method for preparing micropore ceramics diaphragm |
| CN108987651A (en) * | 2018-07-27 | 2018-12-11 | 江苏卓高新材料科技有限公司 | A method of preparing micropore ceramics composite diaphragm |
| CN110965335A (en) * | 2019-12-27 | 2020-04-07 | 江苏华峰超纤材料有限公司 | Polyurethane resin immersion liquid and microfiber base fabric for intelligent temperature-adjusting clothes and preparation method |
| CN110965335B (en) * | 2019-12-27 | 2022-04-29 | 江苏华峰超纤材料有限公司 | Polyurethane resin immersion liquid and microfiber base fabric for intelligent temperature-adjusting clothes and preparation method |
| CN112501918A (en) * | 2021-01-11 | 2021-03-16 | 禾欣可乐丽超纤皮(嘉兴)有限公司 | Novel method for adjusting micropores of microfiber base cloth membrane by polyurethane wet method |
| CN112501918B (en) * | 2021-01-11 | 2022-06-24 | 禾欣可乐丽超纤皮(嘉兴)有限公司 | Novel method for adjusting micropores of microfiber base cloth membrane by polyurethane wet method |
| CN114086401A (en) * | 2021-12-09 | 2022-02-25 | 江苏华峰超纤材料有限公司 | Preparation method of waterborne polyurethane leather-imitated superfine fiber synthetic leather base cloth |
| CN114645460A (en) * | 2022-01-26 | 2022-06-21 | 合肥科天水性科技有限责任公司 | Preparation method of waterborne polyurethane high-physical-property high-density space leather base |
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Application publication date: 20120321 |