CN101921536B - Waterborne polyurethane film and preparation technology thereof - Google Patents
Waterborne polyurethane film and preparation technology thereof Download PDFInfo
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- CN101921536B CN101921536B CN 201010250666 CN201010250666A CN101921536B CN 101921536 B CN101921536 B CN 101921536B CN 201010250666 CN201010250666 CN 201010250666 CN 201010250666 A CN201010250666 A CN 201010250666A CN 101921536 B CN101921536 B CN 101921536B
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Abstract
The invention relates to a waterborne polyurethane film and a preparation technology thereof. The preparation technology comprises the following steps: (1) mixing waterborne polyurethane emulsion, a thickener and a pH regulator to prepare a waterborne polyurethane painting, wherein the weight of the thickener accounts for 0.5%-3% of that of the waterborne polyurethane emulsion and the weight of the pH regulator accounts for 0.05%-0.5% of that of the waterborne polyurethane emulsion; (2) placing the waterborne polyurethane painting obtained in step (1) on a base material; (3) dragging the base material to cause the waterborne polyurethane painting to pass through a knife-edge gap, thereby ensuring the film thickness to be 10 mu m-20 mu m; and (4) carrying out drying and rolling on the waterborne polyurethane film obtained in step (3). In the process of the technology of the invention, organic solvent does not volatilize or a little amount of the organic solvent volatilizes and control equipment with complicated fusion, extrusion or calendar is in no need, thereby having the advantages of stability and reliability.
Description
Technical field
The present invention relates to a kind of waterborne polyurethane film and preparation technology thereof.
Background technology
The film material occupies very important status in modern humans's social activity.Except the functions such as some performances of conventional film material such as frivolous, soft, transparent or painted, obstruct, protection can satisfy the growing demand of people, some new functional membrane materials are changing people's life.Film material with airing function is wherein important growth pole.
The whole world has airing function film material at present two types, one class be paper diaper, sanitary towel air-permeable envelope common in living be the microporous breathable film of representative, it is to add the calcium carbonate microparticle drawn by plastics such as PE to form, and its texture and comfort level all can not be satisfactory; Another kind be with urethane thermoplastic elastomer through blowing or extrude casting method and form, its particle all needs import, its elasticity, ventilative and other performance all can not be from main controls, these effects limit the development of industry.
1. microporous breathable film
The structure of microporous type air-permeating film forms as add inorganic particles in polymkeric substance by two kinds of incompatible components of drawing-off.There are a lot of micropores as kapillary in its structure.These micropores have consisted of the passage that allows gas to pass through, so but because the diameter of the liquid drop in the external world diameter greater than micropore can not pass through.
The representative of this class film material has the PE air-permeable envelope: this kind air-permeable envelope adds fine special stopping composition (as CaCO take polyolefin resin as carrier
3) after extrude with the cold roller method of forming of curtain coating and form, after longitudinal stretching is processed, have the microvoid structure of uniqueness.These are distributed in the special construction micropore of film surface with high-density, make the seepage that film can liquid barrier water, can allow again the gas molecules such as water vapor pass through.Measure under humidity 90%, the condition of 37 ℃, water vapour air penetrability (WVTR) can reach 500～5000g/m
2(24h), water pressure resistance (60～200cm water column).
2. molecule air-permeable envelope
Molecular film is fine and close pore-free film, by simply extruding blown film or other Technology production, then attaches on fabric.The process of osmosis of aqueous vapor on molecular film can be described as " initiatively diffusion " process.The process that helium in this and balloon oozes out is similar.Penetrant is attached to one side of high density, utilizes the pressure difference that exists to diffuse and penetrate into the other side of film.For molecular film, the chemical structure of polymkeric substance and the thickness of film are the principal elements that determines seepage force.
The representative of this class film material has the PU air-permeable envelope: claim again the urethane air-permeable envelope, main adopt extrude, the techniques such as calendering and blowing prepare, due to the polyurethane molecular structure, people can change its elasticity, hardness and wetting ability by regulating the polyurethane blocks component proportions.Therefore polyurethane film equally has remarkable high tensile, high-tensile strength, water-proof breathable properties, obdurability and ageing-resistant performance with polyurethane elastomer, has again excellent biology and blood compatibility and chemical proofing simultaneously.Its Gas permeability is high, is widely used in a plurality of fields such as health care, high-grade weaving face fabric, industry, deeply is subjected to user's welcome and favor.
At present popular PU air-permeable envelope production technique is generally thermoplastic elastomer (TPU) filming technology in the world.Polyurethane termoplastic elastomer claims again thermoplastic polyurethane rubber, be called for short TPU, it is a kind of (AB) N-shaped block linear polymer, A is polyester or the polyethers of high molecular (1000～6000), B is the glycol that contains 2～12 straight chain carbon atoms, the intersegmental chemical structure of AB chain is vulcabond, and general structural formula is:
Wherein R is vulcabond; R ' is macromolecule polyester or polyether Glycols; R " be the small molecules dibasic alcohol.
Thermoplastic polyurethane rubber is by lightly crosslinked between the crosslinked or macromolecular chain of intermolecular hydrogen bonding, and with rising or the reduction of person's temperature, these two kinds of crosslinking structures have reversibility.Weaken in molten state or solution state intermolecular forces, and have strong intermolecular forces to link together after cooling or solvent evaporates, recover the performance of original solid.
Polyurethane termoplastic elastomer has polyester type and polyether-type two classes, the random spherical or cylindrical particle of white, and relative density 1.10～1.25, the polyether-type relative density is less than polyester type.The polyether-type second-order transition temperature is 100.6～106.1 ℃, 108.9～122.8 ℃ of polyester type second-order transition temperatures.The temperature limit of brittleness of polyether-type and polyester type is lower than-62 ℃, and the polyether-type lower temperature resistance is better than polyester type.
The outstanding characteristics of polyurethane termoplastic elastomer are that excellent in abrasion resistance, ozone resistance are fabulous, hardness is large, intensity is high, good springiness, low temperature resistant, good oil resistant, chemical-resistant resistance and environmental resistance are arranged, and the stability to hydrolysis of polyether-type far surpasses polyester type in wet environment.
The processing of polyurethane elastomer often will be used organic solvent, and along with the establishment of various countries' environmental regulation and the enhancing of environmental consciousness, the quantity discharged of the volatile-type organic compound (VOC) in traditional solvent based coating more and more is restricted.The low pollution of exploitation, high-performance, multi-functional environment-friendly type coating become the main direction of coating technology development.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of waterborne polyurethane film, and it has functional (as ventilation property), the feature of environmental protection (low VOC discharging), and its industrialization has its own strategic significance.
Another object of the present invention is to provide the preparation method of waterborne polyurethane film.
The present invention is adopted solution to be by the problem of the above-mentioned proposition of solution: waterborne polyurethane film, it is characterized in that: its component and component concentration thereof are: aqueous polyurethane emulsion, thickening material and pH adjusting agent, wherein thickening material accounts for the 0.5%-3% of aqueous polyurethane emulsion weight, pH adjusting agent accounts for the 0.05%-0.5% of aqueous polyurethane emulsion weight, through being mixed and made into aqueous polyurethane coating, become waterborne polyurethane film through being coated with drying.
Press such scheme, described aqueous polyurethane emulsion is: the BAYDERM bottom 10UD that the DISPERCOLL U54 that the JSJ-3096 that the JSJ-3090 that Guangzhou thunder spoke Science and Technology Ltd. produces, Guangzhou thunder spoke Science and Technology Ltd. produce, Bayer A.G produce or bright Sheng chemistry (Shanghai) Co., Ltd. produce.
Press such scheme, described thickening material is that the TR-308 that Nore chemical industry company limited produces is thought in the ViscalexHV-30 that produces of the ASE60 that produces of Rohm Haas company, Ciba company or Changzhou.
Press such scheme, described pH adjusting agent is ammoniacal liquor, triethylamine or dimethylethanolamine.
Press such scheme, the viscosity of described aqueous polyurethane coating is 10000mPa.s-50000mPa.s, and its solid content is 20%-50wt.%.
The preparation technology of waterborne polyurethane film, it is characterized in that including following steps: 1) with aqueous polyurethane emulsion, thickening material and pH adjusting agent, through being mixed and made into aqueous polyurethane coating, described thickening material accounts for the 0.5%-3% of aqueous polyurethane emulsion weight, and pH adjusting agent accounts for the 0.05%-0.5% of aqueous polyurethane emulsion weight; 2) with step 1) aqueous polyurethane coating of gained is placed on base material; 3) drag base material, make aqueous polyurethane coating pass through a knife edge clearance, guarantee thickness 10 μ m-200 μ m; 5) with step 3) the gained waterborne polyurethane film is dried, rolling.
Press such scheme, the temperature of described baking step is 40-80 ℃, and the time is 3-4 minute.
Beneficial effect of the present invention is: do not exist in technological process of the present invention or have a small amount of organic solvent to volatilize, do not need complicated melting, extrude or roll operating device, reliable and stable, aqueous polyurethane emulsion of the present invention is mainly by 1) vulcabond, 2) oligopolymer dibasic alcohol, 3) chainextender, 4) aqueous monomers and 5) neutralizing agent is polymerized.Generally in organic solvent by 1) vulcabond, 2) oligopolymer dibasic alcohol and 3) chainextender makes prepolymer, make the water-based prepolymer and also need add 4) aqueous monomers, two-pack person 2) oligopolymer dibasic alcohol individual curing.Have negatively charged ion or positively charged ion to form group in the aqueous monomers of ionic aqueous polyurethane, add to contain 5) in the water of neutralizing agent, get aqueous product.Its production process of aqueous polyurethane is used organic solvent less, and take water as dispersion medium, what volatilize in use is moisture, therefore can accomplish the VOC free discharging, traditional urethane filming technology generally needs accurately to control melt temperature on the other hand, to control fluidity of molten, this comprises independent heating apparatus, or screw extrusion apparatus etc., its extrusion more needs accurate metering pumping out system, speed control system, with the control thickness, and the present invention only deals with problems with an edge of a knife on preparation technology.
Embodiment
Below in conjunction with embodiment, the present invention is described in further details, but can be construed as limiting the invention.
Embodiment 1
Water intaking based polyurethane emulsion JSJ-3090 (Guangzhou thunder spoke Science and Technology Ltd.) 100g, add thickening material ASE60 (Rohm Haas company) 1g, high speed dispersion (800 rev/mins of rotating speeds), dripping ammoniacal liquor 0.15g again under slowly stirring is 20000mPa.s to aqueous polyurethane coating viscosity, and its solid content is 50wt%.With glass rod with the aqueous polyurethane coating blade coating on the base material separate-type paper, drag base material, make aqueous polyurethane coating pass through a knife edge clearance, be coated with thick 80 μ m, 60 ℃ of dryings 4 minutes, film forming, rolling.
Through test, its tensile strength 18-20Mpa, elongation at break 280-300%, water vapor transmission rate (WVTR) 1200g/m
2.24h.
Embodiment 2
Water intaking based polyurethane emulsion JSJ-3096 (Guangzhou thunder spoke Science and Technology Ltd.) 100g, add thickening material ASE60 (Rohm Haas company) 2g, high speed dispersion (2400 rev/mins of rotating speeds), dripping ammoniacal liquor 0.1g again under slowly stirring is 50000mPa.s to aqueous polyurethane coating viscosity, and its solid content is 40wt%.With glass rod with the aqueous polyurethane coating blade coating on base material PET film, drag base material, make aqueous polyurethane coating pass through a knife edge clearance, be coated with thick 80 μ m, 80 ℃ of dryings 3 minutes, film forming, rolling.
Through test, its tensile strength 18-20Mpa, elongation at break 280-300%, water vapor transmission rate (WVTR) 900g/m
2.24h.
Embodiment 3
Water intaking based polyurethane emulsion BAYDERM bottom 10UD (the chemical (Shanghai) Co., Ltd. of bright Sheng) 100g, add thickening material TR-308 (Changzhou think of Nore chemical industry company limited) 2g, high speed dispersion (2400 rev/mins), dripping triethylamine 0.15g again under slowly stirring is 30000mPa.s to aqueous polyurethane coating viscosity, and its solid content is 28wt%.With glass rod with the aqueous polyurethane coating blade coating on base material PET film, drag base material, make aqueous polyurethane coating pass through a knife edge clearance, be coated with thick 80 μ m, 40 ℃ of dryings 4 minutes, film forming, rolling.
Through test, its tensile strength 12-15Mpa, elongation at break 400-600%, water vapor transmission rate (WVTR) 1500g/m
2.24h.
Embodiment 4
Water intaking based polyurethane emulsion DISPERCOLL U54 (Bayer A.G) 100g, add thickening material Viscalex HV-30 (Ciba company) 2g, high speed dispersion (2400 rev/mins), dripping ammoniacal liquor 0.15g again under slowly stirring is 50000mPa.s to aqueous polyurethane coating viscosity, and its solid content is 40wt%.With glass rod with the aqueous polyurethane coating blade coating on base material PET film, be coated with thick 80 μ m, 80 ℃ of dryings 3 minutes, film forming, rolling.
Through test, its tensile strength 12-15Mpa, elongation at break 400-600%, water vapor transmission rate (WVTR) 1500-2000g/m
2.24h.
the aqueous polyurethane emulsion that above-described embodiment 1-4 uses, thickening material and pH adjusting agent are existing material well known to those skilled in the art, for example aqueous polyurethane emulsion can adopt the JSJ-3090 that Guangzhou thunder spoke Science and Technology Ltd. produces, the JSJ-3096 that Guangzhou thunder spoke Science and Technology Ltd. produces, the BAYDERM bottom 10UD that the chemical (Shanghai) Co., Ltd. of the DISPERCOLL U54 that Bayer A.G produces or bright Sheng produces, thickening material can adopt Viscalex HV-30 that ASE60 that Rohm Haas company produces or Ciba company produce or Changzhou to think the TR-308 that Nore chemical industry company limited produces.The below introduces respectively this several materials.
The JSJ-3090 that Guangzhou thunder spoke Science and Technology Ltd. produces: polyurethane high molecule compound 50%, solvent 3%, neutralizing agent 0.5%, moisture 46.5%
The JSJ-3096 that Guangzhou thunder spoke Science and Technology Ltd. produces: polyurethane high molecule compound 40%, solvent 3%, neutralizing agent 0.5%, moisture 56.5%.
The DISPERCOLL U54 that Bayer A.G produces: aliphatics waterborne self-crosslinkable type polyurethane emulsion, solid content 50%.
The BAYDERM bottom 10UD of bright Sheng chemical production: weak anionic polyaminoester emulsion, solid content 30%.
The ASE60 that Rohm Haas company produces: negatively charged ion hydrophobically modified propylene soda acid swelling type thickening material.
The Viscalex HV-30 that Ciba company produces: polyacrylic alkali swelling thickening material.
The TR-308 that Changzhou think of Nore chemical industry company limited produces: propylene soda acid swelling thickening material.
Claims (4)
1. waterborne polyurethane film, it is characterized in that: its component and component concentration thereof are: aqueous polyurethane emulsion, thickening material and pH adjusting agent, wherein thickening material accounts for the 0.5%-------3% of aqueous polyurethane emulsion weight, pH adjusting agent accounts for the 0.05%-0.5% of aqueous polyurethane emulsion weight, through being mixed and made into aqueous polyurethane coating, become waterborne polyurethane film through being coated with drying, the viscosity of described aqueous polyurethane coating is 10000mPa.s-50000mPa.s, its solid content is 20%-50wt.%, described aqueous polyurethane emulsion is: the JSJ-3090 that Guangzhou thunder spoke Science and Technology Ltd. produces, the JSJ-3096 that Guangzhou thunder spoke Science and Technology Ltd. produces, the BAYDERM bottom 10UD that the chemical Shanghai of the DISPERCOLL U54 that Bayer A.G produces or bright Sheng company limited produces.
2. by waterborne polyurethane film claimed in claim 1, it is characterized in that: described thickening material is that the TR-308 that Nore chemical industry company limited produces is thought in the Viscalex HV-30 that produces of the ASE60 that produces of Rohm Haas company, Ciba company or Changzhou.
3. by waterborne polyurethane film claimed in claim 1, it is characterized in that: described pH adjusting agent is ammoniacal liquor, triethylamine or dimethylethanolamine.
4. the preparation technology of waterborne polyurethane film claimed in claim 1, it is characterized in that including following steps: 1) with aqueous polyurethane emulsion, thickening material and pH adjusting agent, through being mixed and made into aqueous polyurethane coating, the viscosity of described aqueous polyurethane coating is 10000mPa.s-50000mPa.s, its solid content is 20%-50wt.%, described thickening material accounts for the 0.5%-------3% of aqueous polyurethane emulsion weight, and pH adjusting agent accounts for the 0.05%-0.5% of aqueous polyurethane emulsion weight; 2) aqueous polyurethane coating with the step 1) gained is placed on base material; 3) drag base material, make aqueous polyurethane coating pass through a knife edge clearance, guarantee thickness 10 μ m-200 μ m; 4) step 3) gained waterborne polyurethane film is dried, rolling, the temperature of described baking step is 40-80 ℃, the time is 3-4 minute.
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| CN 201010250666 CN101921536B (en) | 2010-08-11 | 2010-08-11 | Waterborne polyurethane film and preparation technology thereof |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102379780A (en) * | 2011-08-05 | 2012-03-21 | 林相国 | Environmental-friendly diaper |
| CN109349709A (en) * | 2018-12-07 | 2019-02-19 | 龙之族（中国）有限公司 | A kind of seamless down-filling feather dress fabric and its production method |
| CN109912959B (en) * | 2019-03-06 | 2022-07-29 | 绍兴奥唯特纳米科技有限公司 | Water-based metal color paste with metal flashing effect for latex balloons, preparation method of water-based metal color paste and latex balloons |
| CN111849014B (en) * | 2020-07-20 | 2022-07-05 | 福建琦峰科技有限公司 | Weak acid antistatic waterproof breathable film and preparation method thereof |
| CN111961329B (en) * | 2020-08-26 | 2022-10-14 | 安徽达钰新材料科技有限公司 | Water-based PU waterproof moisture-permeable film and preparation method thereof |
| CN113249020A (en) * | 2021-05-19 | 2021-08-13 | 上海三棵树防水技术有限公司 | High-stain-resistance sewage-water-resistant polyurethane waterproof coating and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101348689A (en) * | 2008-09-04 | 2009-01-21 | 浙江美浓涂料有限公司 | Aqueous Malay paint |
| CN101481580A (en) * | 2008-12-23 | 2009-07-15 | 中国人民解放军总后勤部军需装备研究所 | Waterproof, low temperature resistant, soft and moisture permeable coating glue and preparation thereof |
-
2010
- 2010-08-11 CN CN 201010250666 patent/CN101921536B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101348689A (en) * | 2008-09-04 | 2009-01-21 | 浙江美浓涂料有限公司 | Aqueous Malay paint |
| CN101481580A (en) * | 2008-12-23 | 2009-07-15 | 中国人民解放军总后勤部军需装备研究所 | Waterproof, low temperature resistant, soft and moisture permeable coating glue and preparation thereof |
Non-Patent Citations (1)
| Title |
|---|
| 姜炜等.水性聚氨酯乳液的合成和应用.《印染助剂》.1989,第6卷(第1期),9-11. * |
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Denomination of invention: Waterborne polyurethane film and preparation technology thereof Effective date of registration: 20140103 Granted publication date: 20131106 Pledgee: China Co truction Bank Corp Wuhan Jiang'an subbranch Pledgor: Wuhan Huawei Technology Co., Ltd. Registration number: 2014990000009 |
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Denomination of invention: Waterborne polyurethane film and preparation technology thereof Effective date of registration: 20140103 Granted publication date: 20131106 Pledgee: China Co truction Bank Corp Wuhan Jiang'an subbranch Pledgor: Wuhan Huawei Technology Co., Ltd. Registration number: 2014990000009 |
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