CN102408699B - Composite slurry, synthetic leather substrate and preparation method of synthetic leather substrate - Google Patents
Composite slurry, synthetic leather substrate and preparation method of synthetic leather substrate Download PDFInfo
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Abstract
The invention relates to waterborne polyurethane composite slurry, a waterborne polyurethane synthetic leather substrate, and a preparation method of the waterborne polyurethane synthetic leather substrate. The preparation method of the waterborne polyurethane synthetic leather substrate comprises the following steps: a. preparing waterborne polyurethane composite slurry; b. dipping a non-woven fabric with the composite slurry, strickling the surface of the non-woven fabric by a scraper; c. solidifying the treated non-woven fabric by waterborne solidification liquid; d. performing water washing by a water washing trough after the solidification of the waterborne polyurethane resin so as to form a substrate fabric; e. drying the substrate fabric in a drying box, increasing the temperature sectionally, allowing a foaming agent to foam during the drying process, performing hot setting to form the substrate fabric so as to obtain the synthetic leather substrate. The waterborne polyurethane synthetic leather substrate is prepared by the above preparation method. A foaming agent is adopted in the process of the invention, which foams during the drying process of the substrate so as to form a microporous structure, and thus the synthetic leather substrate is provided with excellent elasticity.
Description
Technical field
The present invention relates to the preparation method of a kind of composite mortar, synthetic leather base material and synthetic leather base material, especially the preparation method who relates to a kind of aqueous polyurethane composite mortar, aqueous polyurethane synthetic leather base material and aqueous polyurethane synthetic leather base material, belongs to synthetic leather production technical field.
Background technology
Synthetic Leather has been applied to the every field in people's life at present, and every year to surpass 10% speed increment, 2009 over 1,200,000,000 meters in recent years.The polyurethane slurry of traditional use for synthetic leather was to take solvent-borne type as main slurry in the past, technology is ripe, range of product is various, a kind of wet-method synthetic leather that is widely used in clothing leather, sofa artificial leather, luggage leather and footwear leather wherein, to take solvent borne polyurethane as dipping sizing agent immersion non-woven fabrics, or on the non-woven fabrics of dipping sizing agent, apply slurry again, and then pass through wet process technique, in dimethyl formamide (DMF) aqueous solution, solidify, then wash and dry.The essential use of the preparation DMF of this synthetic leather, reclaims although DMF is most of, still has the irretrievable solvent of small portion to discharge with gas and waste water mode; Simultaneously Environmental Protection in China portion to the sewage discharge regulation DMF content of leather industry respectively at 0.1mg/L, below 0.2mg/L.In addition can residual DMF in product, the DMF residual quantity of now a lot of environmentfriendly products be defined in 300ppm even requirements at the higher level be below 30ppm.
Waterborne polyurethane resin is to take water as dispersion medium, there is nontoxic, environmental protection, safety, the advantage such as do not fire, and be the best substitute products of solvent type resin.There are very large policy and financial support in various countries to the research of aqueous polyurethane and application, China also drops into also larger in the research of waterborne polyurethane resin with application, but the application of waterborne polyurethane resin on synthetic leather be some progress in recent years just comparatively speaking, main research concentrates on the surface finish of synthetic leather, only have water-based dry method to move the technology such as membrane technique and printing and be applied in actual production, aqueous polyurethane synthetic leather overall technology is developed also in the starting stage.Along with the development of waterborne polyurethane resin technology, product performance improve, and international and domestic each dropped into about company also strengthens applied research in recent years.Because waterborne polyurethane resin be take water as dispersion medium, so possessed the feature of safety, environmental protection, but simultaneously because hydrophilic feature makes waterborne polyurethane resin water tolerance, powerful relatively have certain gap with conventional solvent type polyurethane resin, processing characteristics also has very large difference, especially waterborne polyurethane resin, must the new technical matters of exploitation as dipping sizing agent and prepare synthetic leather base material and can not use for reference traditional technical matters completely in technical matters.Our company adopts waterborne polyurethane resin to prepare synthetic leather through long-term research work, within nearly 2 years, obtains greater advance.We have very big breakthrough in this technical matters.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of synthetic leather base material, and this synthetic leather base material first can be used as shoe lining leather through waterborne polyurethane resin printing processing; Second prepares footwear leather and luggage leather through the dry method veneer of waterborne polyurethane resin, the 3rd or on above-mentioned synthetic leather base material, carry out the dry method mechanical intumescent coating of waterborne polyurethane resin, on dry method intumescent coating, footwear leather and luggage leather are prepared in dry method veneer or the printing processing through waterborne polyurethane resin again, and the performance of this full aqueous polyurethane synthetic leather reaches the index request of city shoe leather and luggage leather.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of aqueous polyurethane composite mortar, is comprised of the raw material of following parts by weight: 100 parts of anion aqueous polyurethane resins, 3～5 parts of whipping agents, 1～2 part of softening agent, 0.5～2 part of thickening material, 100～210 parts, water.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described anion aqueous polyurethane resin is by vulcabond, macromolecular polyol, small molecule chain extender, form containing carboxylic acid group's wetting ability chainextender, neutralizing agent and water.
Further, the solid weight percentage composition of described resin is 20%～40%; 100% tensile modulus of resin drying epithelium is 2MPa～10MPa.
Further, described vulcabond is tolylene diisocyanate, ditan 4.4-vulcabond, hydrogenation ditan 4.4-vulcabond, hexamethylene diisocyanate, isophorone diisocyanate.
Further, described macromolecular polyol is polyoxypropyleneglycol ether, polyoxytrimethylene three alcohol ethers, polytetrahydrofuran diol ether, and the diol ester of the diol ester of poly-own interior diol ester, poly-hexanodioic acid, polycarbonate polyol, poly-terephthalic acid is, one or more in the diol ester of poly-phthalic acid.
Further, described small molecule chain extender is ethylene glycol, butyleneglycol, Diethylene Glycol, 1,6-hexylene glycol.
Further, described is dimethylol propionic acid, dimethylolpropionic acid containing carboxylated hydrophilic chainextender.
Further, described neutralizing agent is triethylamine, trolamine.
Further, described water is deionized water.
Further, the molecular weight of described macromolecular polyol is 250～5000, is preferably 500～4000.
Further, the solid weight percentage composition of described resin is 20%～40%; 100% tensile modulus of resin drying epithelium is 2MPa～10MPa.
Further, described whipping agent is Cellmic C 121 (low temperature leather whipping agent), microcapsule foamer.The blowing temperature of described Cellmic C 121 is 135 ℃～145 ℃; The blowing temperature of described microcapsule foamer is 110 ℃～145 ℃.
Further, described softening agent is modified polysiloxane softening agent;
Further, described thickening material is association type polyurethane thickener, alkali swelling acrylic copolymer.
Another technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of preparation method of aqueous polyurethane synthetic leather base material, and concrete technology step is as follows:
A. prepare aqueous polyurethane composite mortar;
B. use above-mentioned composite mortar immersion non-woven fabrics, and with scraper, described nonwoven surface is struck off;
C. the non-woven fabrics of processing in process water-based solidification liquid coagulation step b;
D. waterborne polyurethane resin is washed and is formed base cloth through washing bath after solidifying;
E. above-mentioned base cloth is put into loft drier and dry, temperature is from low to high from 110 ℃-130 ℃-145 ℃-155 ℃, and temperature section improves, and whipping agent starts foaming in drying course, through 10～20 minutes drying and shaping, forms the inner synthetic leather base cloth that has micropore.
Further, in step a, the concrete steps of described preparation aqueous polyurethane composite mortar are: the raw material of described aqueous polyurethane composite mortar is stirred 30～60 minutes under the speed of 600～1000 revs/min, and obtaining density is the aqueous polyurethane composite mortar of 700～900g/L.
Further, described non-woven fabrics is the blending non-woven fabrics of tynex, trevira or tynex and trevira.
Further, the thickness of described non-woven fabrics is 0.5～2mm.
Further, in step b, after described composite mortar immersion non-woven fabrics, the pickup of waterborne polyurethane resin is 200～600g/m
2.
Further, in step c, the pH value of described water-based solidification liquid is 5.5～3.5, and the temperature of described water-based solidification liquid is 10 ℃～50 ℃.
Further, in step e, described loft drier is infrared drying oven, steam drying cabinet or electrical drying case.
Another technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of aqueous polyurethane synthetic leather base material, is made by preparation method described above.
The invention has the beneficial effects as follows:
One, adopt waterborne polyurethane resin to replace solvent type polyurethane resin environmental protection more; In waterborne polyurethane resin, do not contain solvent, dilute with water in use procedure; In conventional solvent type polyurethane resin, contain the DMF solvent that is greater than 70%, in dilution, also need to use DMF solvent; DMF can reclaim and still have small portion volatilization through recovery 95%, and energy consumption is large;
Two, in traditional technology, be the microvoid structure forming in wet method process of setting, make synthetic leather base material there is good elasticity; In technique of the present invention, adopt whipping agent, in base material drying course, foam, also can form microvoid structure, make synthetic leather base material have good elasticity, performance reaches the index request of footwear leather and luggage leather;
Three, in synthetic leather, do not contain solvent, discharged the harm of solvent to human body; This synthetic leather non-woven fabrics wide material sources used, low price; This aqueous polyurethane synthetic leather preparation process is simple, energy-conserving and environment-protective.Can Substitute For Partial tradition synthetic leather product.
Embodiment
Below principle of the present invention and feature are described, example, only for explaining the present invention, is not intended to limit scope of the present invention.
Embodiment 1
An aqueous polyurethane composite mortar, is comprised of the raw material of following parts by weight: 100 parts of anion aqueous polyurethane resins, 3 parts of Cellmic C 121s (low temperature leather whipping agent), 1 part of modified polysiloxane softening agent, 0.5 part of association type polyurethane thickener, 100 parts, water.
Described anion aqueous polyurethane resin is comprised of tolylene diisocyanate, polyoxypropyleneglycol ether and polyoxytrimethylene three alcohol ethers, ethylene glycol, dimethylol propionic acid, triethylamine and deionized water.
The solid weight percentage composition of described resin is 20%; 100% tensile modulus of resin drying epithelium is 10MPa.
A preparation method for aqueous polyurethane synthetic leather base material, concrete technology step is as follows:
A. prepare aqueous polyurethane composite mortar: the raw material that is about to aqueous polyurethane composite mortar described above stirs 60 minutes under the speed of 1000 revs/min, obtaining density is the aqueous polyurethane composite mortar of 700g/L;
B. with above-mentioned composite mortar dipping polyamide fibre/terylene non-woven fabric, thickness is 1.0mm, and flooding after polyamide fibre/terylene non-woven fabric extruding, to make the pickup of resin be 200g/m
2, and with scraper, described polyamide fibre/terylene non-woven fabric surface is struck off;
C. pass through the polyamide fibre/terylene non-woven fabric of above-mentioned processing, enter in coagulating pan, solidification liquid pH value is 5.5, and the temperature of solidification liquid is at 25 ℃;
D. waterborne polyurethane resin is washed and is formed base cloths through 50 ℃ of washing baths after solidifying;
E. above-mentioned base cloth is put into infrared drying oven and dry, temperature is from low to high from 110 ℃-130 ℃-145 ℃-155 ℃, and temperature section improves, and whipping agent foams in drying course, through 10 minutes drying and shaping, forms the inner synthetic leather base cloth that has micropore;
An aqueous polyurethane synthetic leather base material, is made by the preparation method described in embodiment 1.
Embodiment 2
An aqueous polyurethane composite mortar, is comprised of the raw material of following parts by weight: 100 parts of anion aqueous polyurethane resins, 4 parts of microcapsule foamers, 1.5 parts of modified polysiloxane softening agents, 1 part of association type polyurethane thickener, 160 parts, water.
Described anion aqueous polyurethane resin is comprised of ditan 4.4-vulcabond, polytetrahydrofuran diol ether and poly-own interior diol ester, butyleneglycol, dimethylolpropionic acid, trolamine and deionized water.
The solid weight percentage composition of described resin is 30%; 100% tensile modulus of resin drying epithelium is 5MPa.
A preparation method for aqueous polyurethane synthetic leather base material, concrete technology step is as follows:
A. prepare aqueous polyurethane composite mortar: the raw material of aqueous polyurethane composite mortar described above is stirred 40 minutes under the speed of 800 revs/min, and obtaining density is the aqueous polyurethane composite mortar of 800g/L;
B. with above-mentioned composite mortar dipping polyamide fibre non-woven fabrics, thickness is 1.5mm, and flooding after polyamide fibre non-woven fabrics extruding, to make the pickup of resin be 450g/m
2, and with scraper, described polyamide fibre nonwoven surface is struck off;
C. the polyamide fibre non-woven fabrics that passes through above-mentioned processing, enters in coagulating pan, and solidification liquid pH value is 4.5, and the temperature of solidification liquid is at 40 ℃;
D. waterborne polyurethane resin is washed and is formed base cloths through 50 ℃ of washing baths after solidifying;
E. above-mentioned base cloth is put into steam drying cabinet and dry, temperature is from low to high from 110 ℃-130 ℃-145 ℃-155 ℃, and temperature section improves, and whipping agent foams in drying course, through 15 minutes drying and shaping, forms the inner synthetic leather base cloth that has micropore;
An aqueous polyurethane synthetic leather base material, is made by the preparation method described in embodiment 2.
Embodiment 3
An aqueous polyurethane composite mortar, is comprised of the raw material of following parts by weight: 100 parts of anion aqueous polyurethane resins, 5 parts of microcapsule foamers, 1.5 parts of modified polysiloxane softening agents, 1.5 parts of alkali swelling acrylic copolymer association type polyurethane thickeners, 180 parts, water.
Described anion aqueous polyurethane resin is comprised of hexamethylene diisocyanate, the poly-diol ester of hexanodioic acid series and diol ester, Diethylene Glycol, dimethylol propionic acid, trolamine and the deionized water of poly-terephthalic acid series.
The solid weight percentage composition of described resin is 35%; 100% tensile modulus of resin drying epithelium is 2MPa.
A preparation method for aqueous polyurethane synthetic leather base material, concrete technology step is as follows:
A. prepare aqueous polyurethane composite mortar: the raw material that is about to aqueous polyurethane composite mortar described above stirs 50 minutes under the speed of 700 revs/min, obtaining density is the aqueous polyurethane composite mortar of 800g/L;
B. with above-mentioned composite mortar dipping terylene non-woven fabric, thickness is 1.2mm, and flooding after terylene non-woven fabric extruding, to make the pickup of resin be 400g/m
2, and with scraper, described terylene non-woven fabric surface is struck off;
C. pass through the terylene non-woven fabric of above-mentioned processing, enter in coagulating pan, solidification liquid pH value is 4.4, and the temperature of solidification liquid is at 40 ℃;
D. waterborne polyurethane resin is washed and is formed base cloths through 50 ℃ of washing baths after solidifying;
E. above-mentioned base cloth is put into infrared drying oven and dry, temperature is from low to high from 110 ℃-130 ℃-145 ℃-155 ℃, and temperature section improves, and whipping agent foams in drying course, through 16 minutes drying and shaping, forms the inner synthetic leather base cloth that has micropore;
An aqueous polyurethane synthetic leather base material, is made by the preparation method described in embodiment 3.
Embodiment 4
An aqueous polyurethane composite mortar, is comprised of the raw material of following parts by weight: 100 parts of anion aqueous polyurethane resins, 5 parts of Cellmic C 121s (low temperature leather whipping agent), 2 parts of modified polysiloxane softening agents, 2 parts of alkali swelling acrylic copolymer, 190 parts, water.
Described anion aqueous polyurethane resin is by the diol ester, 1 of isophorone diisocyanate, polycarbonate polyol and poly-phthalic acid series, and 6-hexylene glycol, dimethylolpropionic acid, triethylamine and deionized water form.The solid weight percentage composition of described resin is 35%; 100% tensile modulus of resin drying epithelium is 8MPa.
A preparation method for aqueous polyurethane synthetic leather base material, concrete technology step is as follows:
A. prepare aqueous polyurethane composite mortar: the raw material that is about to aqueous polyurethane composite mortar described above stirs 50 minutes under the speed of 600 revs/min, obtaining density is the aqueous polyurethane composite mortar of 900g/L;
B. with above-mentioned composite mortar dipping polyamide fibre/blend polyester non-woven fabrics, thickness is 1.4mm, and flooding after non-woven fabrics extruding, to make the pickup of resin be 600g/m
2, and with scraper, described nonwoven surface is struck off;
C. pass through the non-woven fabrics of above-mentioned processing, enter in coagulating pan, solidification liquid pH value=4, the temperature of solidification liquid is at 50 ℃;
D. waterborne polyurethane resin is washed and is formed base cloths through 50 ℃ of washing baths after solidifying;
E. above-mentioned base cloth is put into steam drying cabinet and dry, temperature is from low to high from 110 ℃-130 ℃-145 ℃-155 ℃, and temperature section improves, and whipping agent foams in drying course, through 20 minutes drying and shaping, forms the inner synthetic leather base cloth that has micropore;
An aqueous polyurethane synthetic leather base material, is made by the preparation method described in embodiment 4.
Embodiment 5
An aqueous polyurethane composite mortar, is comprised of the raw material of following parts by weight: 100 parts of anion aqueous polyurethane resins, 4 parts of microcapsule foamers, 1.5 parts of modified polysiloxane softening agents, 1 part of association type polyurethane thickener, 210 parts, water.
Described anion aqueous polyurethane resin is comprised of ditan 4.4-vulcabond, polytetrahydrofuran diol ether and poly-own interior diol ester, butyleneglycol, dimethylolpropionic acid, trolamine and deionized water.
The solid weight percentage composition of described resin is 40%; 100% tensile modulus of resin drying epithelium is 4MPa.
A preparation method for aqueous polyurethane synthetic leather base material, concrete technology step is as follows:
A. prepare aqueous polyurethane composite mortar: the raw material of aqueous polyurethane composite mortar described above is stirred 40 minutes under the speed of 900 revs/min, and obtaining density is the aqueous polyurethane composite mortar of 800g/L;
B. with above-mentioned composite mortar dipping polyamide fibre non-woven fabrics, thickness is 1.5mm, and flooding after polyamide fibre non-woven fabrics extruding, to make the pickup of resin be 450g/m
2, and with scraper, described polyamide fibre nonwoven surface is struck off;
C. the polyamide fibre non-woven fabrics that passes through above-mentioned processing, enters in coagulating pan, solidification liquid pH value=3.5, and the temperature of solidification liquid is at 10 ℃;
D. waterborne polyurethane resin is washed and is formed base cloths through 50 ℃ of washing baths after solidifying;
E. above-mentioned base cloth is put into steam drying cabinet and dry, temperature is from low to high from 110 ℃-130 ℃-145 ℃-155 ℃, and temperature section improves, and whipping agent foams in drying course, through 15 minutes drying and shaping, forms the inner synthetic leather base cloth that has micropore;
An aqueous polyurethane synthetic leather base material, is made by the preparation method described in embodiment 5.
By the prepared aqueous polyurethane synthetic leather base material good hand touch of embodiment 1 to 5.
Comparative example 1
An aqueous polyurethane composite mortar, is comprised of the raw material of following parts by weight: 100 parts of anion aqueous polyurethane resins, 1.5 parts of modified polysiloxane softening agents, 1.5 parts of alkali swelling acrylic copolymer, 180 parts, water.
Described anion aqueous polyurethane resin is comprised of hexamethylene diisocyanate, the poly-diol ester of hexanodioic acid series and diol ester, Diethylene Glycol, dimethylol propionic acid, trolamine and the deionized water of poly-terephthalic acid series.The solid weight percentage composition of described resin is 35%; 100% tensile modulus of resin drying epithelium is 2MPa.
A preparation method for aqueous polyurethane synthetic leather base material, concrete technology step is as follows:
A. prepare aqueous polyurethane composite mortar: the raw material that is about to aqueous polyurethane composite mortar described above stirs 50 minutes under the speed of 700 revs/min, obtaining density is the aqueous polyurethane composite mortar of 800g/L;
B. with above-mentioned composite mortar dipping blend polyester non-woven fabrics, thickness is 1.2mm, and flooding after non-woven fabrics extruding, to make the pickup of resin be 400g/m
2, and with scraper, described nonwoven surface is struck off;
C. pass through the non-woven fabrics of above-mentioned processing, enter in coagulating pan, solidification liquid pH value is 4.4, and the temperature of solidification liquid is at 40 ℃;
D. waterborne polyurethane resin is washed and is formed base cloths through 50 ℃ of washing baths after solidifying;
E. above-mentioned base cloth is put into infrared drying oven and dry, temperature is from low to high from 110 ℃-130 ℃-145 ℃-155 ℃, and temperature section improves, and through 16 minutes drying and shaping, forms the inner base cloth that there is no micropore;
An aqueous polyurethane synthetic leather base material, is made by the preparation method described in comparative example 1, prepared aqueous polyurethane synthetic leather base material Boardy Feeling, and the elasticity of compression is bad.
Comparative example 2
An aqueous polyurethane composite mortar, is comprised of the raw material of following parts by weight: 100 parts of anion aqueous polyurethane resins, 2 parts of microcapsule foamers, 1 part of association type polyurethane thickener, 160 parts, water.
Described anion aqueous polyurethane resin is comprised of ditan 4.4-vulcabond, polytetrahydrofuran diol ether and poly-own interior diol ester, butyleneglycol, dimethylolpropionic acid, trolamine and deionized water.
The solid weight percentage composition of described resin is 30%; 100% tensile modulus of resin drying epithelium is 5MPa.
A preparation method for aqueous polyurethane synthetic leather base material, concrete technology step is as follows:
A. prepare aqueous polyurethane composite mortar: the raw material of aqueous polyurethane composite mortar described above is stirred 40 minutes under the speed of 800 revs/min, and obtaining density is the aqueous polyurethane composite mortar of 800g/L;
B. with above-mentioned composite mortar dipping polyamide fibre non-woven fabrics, thickness is 1.5mm, and flooding after polyamide fibre non-woven fabrics extruding, to make the pickup of resin be 450g/m
2, and with scraper, described polyamide fibre nonwoven surface is struck off;
C. the polyamide fibre non-woven fabrics that passes through above-mentioned processing, enters in coagulating pan, solidification liquid pH value=5.6, and the temperature of solidification liquid is at 40 ℃;
D. waterborne polyurethane resin is washed and is formed base cloths through 50 ℃ of washing baths after solidifying;
E. above-mentioned base cloth is put into steam drying cabinet and dry, temperature is from low to high from 110 ℃-130 ℃-145 ℃-155 ℃, and temperature section improves, and whipping agent foams in drying course, through 15 minutes drying and shaping, forms the inner synthetic leather base cloth that has a small amount of micropore;
An aqueous polyurethane synthetic leather base material, is made by preparation method described above, and prepared aqueous polyurethane synthetic leather base material feel is harder.
The physicals of above example synthetic leather base material is listed in table 1:
Above-mentioned synthetic leather base material can be used waterborne polyurethane resin to prepare full aqueous polyurethane synthetic leather through typography, dry method mechanical intumescent coating technique, dry method surfacing process.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (13)
1. a preparation method for aqueous polyurethane synthetic leather base material, is characterized in that, described preparation method's concrete technology step is:
A. prepare aqueous polyurethane composite mortar;
B. use above-mentioned composite mortar immersion non-woven fabrics, and with scraper, described nonwoven surface is struck off;
C. the non-woven fabrics of processing in process water-based solidification liquid coagulation step b;
D. waterborne polyurethane resin is washed and is formed base cloth through washing bath after solidifying;
E. above-mentioned base cloth is put into loft drier and dry, temperature is from low to high from 110 ℃-130 ℃-145 ℃-155 ℃, and temperature section improves, whipping agent starts foaming in drying course, through 10～20 minutes drying and shaping, forms the inner base cloth that has micropore, obtain synthetic leather base material
Wherein, described composite mortar is comprised of the raw material of following parts by weight: 100 parts of anion aqueous polyurethane resins, 3～5 parts of whipping agents, 1～2 part of softening agent, 0.5～2 part of thickening material, 100～210 parts, water; Wherein,
Described anion aqueous polyurethane resin is by vulcabond, macromolecular polyol, small molecule chain extender, form containing carboxylic acid group's wetting ability chainextender, neutralizing agent and water;
Described whipping agent is Cellmic C 121, microcapsule foamer; Described softening agent is modified polysiloxane softening agent; Described thickening material is association type polyurethane thickener, alkali swelling acrylic copolymer.
2. preparation method according to claim 1, it is characterized in that, in step a, the concrete steps of described preparation aqueous polyurethane composite mortar are: the raw material of described aqueous polyurethane composite mortar is stirred 30～60 minutes under the speed of 600～1000 revs/min, and obtaining density is the aqueous polyurethane composite mortar of 700～900g/L.
3. preparation method according to claim 1, is characterized in that, described non-woven fabrics is the mixed non-woven fabrics of tynex, trevira or tynex and trevira.
4. preparation method according to claim 3, is characterized in that, the thickness of described non-woven fabrics is 0.5～2mm.
5. preparation method according to claim 1, is characterized in that, in step b, after described composite mortar immersion non-woven fabrics, the pickup of waterborne polyurethane resin is 200～600g/m
2.
6. preparation method according to claim 1, is characterized in that, in step c, the pH value of described water-based solidification liquid is 5.5～3.5, and the temperature of described water-based solidification liquid is 10～50 ℃.
7. preparation method according to claim 1, is characterized in that, in step e, described loft drier is infrared drying oven, steam drying cabinet or electrical drying case.
8. according to the arbitrary described preparation method of claim 1 to 7, it is characterized in that, the solid weight percentage composition of described resin is 20～40%; 100% tensile modulus of resin drying epithelium is 2Mpa～10Mpa.
9. according to the arbitrary described preparation method of claim 1 to 7, it is characterized in that, described vulcabond is tolylene diisocyanate, ditan 4.4-vulcabond, hydrogenation ditan 4.4-vulcabond, hexamethylene diisocyanate, isophorone diisocyanate; Described macromolecular polyol is polyoxypropyleneglycol ether, polyoxytrimethylene three alcohol ethers, polytetrahydrofuran diol ether, and the diol ester of the diol ester of poly-interior diol ester, poly-adipic acid, polycarbonate polyol, poly-terephthalic acid is, one or more in the diol ester of poly-phthalic acid; Described small molecule chain extender is ethylene glycol, butyleneglycol, Diethylene Glycol, 1,6-hexylene glycol; Described is dimethylol propionic acid, dimethylolpropionic acid containing carboxylated hydrophilic chainextender; Described neutralizing agent is triethylamine, trolamine; Described water is deionized water.
10. preparation method according to claim 9, is characterized in that, the molecular weight of described macromolecular polyol is 250～5000.
11. preparation methods according to claim 10, is characterized in that, the molecular weight of described macromolecular polyol is 500～4000.
12. according to the arbitrary described preparation method of claim 1 to 7, it is characterized in that, the blowing temperature of described Cellmic C 121 is 135 ℃～145 ℃; The blowing temperature of described microcapsule foamer is 110 ℃～145 ℃.
13. 1 kinds of aqueous polyurethane synthetic leather base materials, is characterized in that, described synthetic leather base material is to be made by the preparation method described in claim 7 to 12 any one.
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| CN102702466B (en) * | 2012-06-20 | 2014-04-23 | 温州市宏得利树脂有限公司 | Preparation method of aqueous polyurethane emulsion for synthetic leather |
| CN103015221B (en) * | 2012-12-20 | 2014-06-04 | 陕西科技大学 | Production method of waterborne polyurethane synthetic leather based on steam solidification |
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