CN103265682A - Special high-temperature resistant waterproof air and moisture permeable resin for coating printing and preparation method thereof - Google Patents
Special high-temperature resistant waterproof air and moisture permeable resin for coating printing and preparation method thereof Download PDFInfo
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Abstract
The invention discloses special high-temperature resistant waterproof air and moisture permeable resin for coating printing and a preparation method thereof. The resin is prepared by the following steps of: obtaining a prepolymer through a reaction between polyether polyol and diisocyanate; and modifying the prepolymer by use of polyhedral oligomeric silsesquioxane to obtain the resin, wherein the average molecular weight of the resin is 50000-150000g/mol, the viscosity is 60000-100000cps/25 DEG C, and the solid content of the resin is 30-55%. In the polyurethane resin prepared by the method disclosed by the invention, the moisture permeability can reach 7500g/m<2>.24H, and the water pressure resistance is greater than 10000mmH2O; moreover, the polyurethane resin has the processing characteristic of tolerating a temperature of 200-230 DEG C for continuous 30S during coating printing; and the resin has highly-permeable coating and soft and smooth handfeel, and is washable and very suitable for the direct coating and coating printing technology of fabric coating processing.
Description
Technical field
The invention belongs to polyurethane preparation Technology field, be specifically related to promote with siloxane modified polyurethane the preparation method of urethane patience.
Background technology
Urethane just uses as elastomeric rubber when World War II, afterwards as water-proof material, is coated in windproof and rain proof on the garment material.But because early stage this polyurethane material is continuous thick film, airtight, it is very vexed to wear, and sweat also permeates less than the outside, therefore very uncomfortable, does not come big area to promote the use of as garment material.The eighties, the Ge Er company of the U.S. released Waterproof Breathable film garment material through series of studies, US Patent No. 4532316 in 1984 has proposed the dress materials of waterproof moisture-penetrating urethane, has from then on begun the research and development upsurge of urethane as the water-proof air-moisture-permeable fabric.Early stage clothes stamp adopts general stamp, and the temperature of handling and processing is all lower, is no more than 180 ℃, in recent years along with The application of new technique, people have had higher requirement for the stamp of clothes, begin to propose 200 ~ 230 ℃, the transfer printing of time length 30S.Common urethane is the product of the reaction of polyethers and polyester and isocyanic ester, and coating is very thin, and coating is through 200 ~ 230 ℃ high temperature process after curing, the paint film high temperature oxidation, hardening becomes fragile, and the soft smooth performance before no longer having can not be used as garment material.
China Patent No. CN 102617823 A have introduced a kind of preparation method who uses the cage-type silsesquioxane modified polyurethane.Under the condition of catalyzer existence and nitrogen atmosphere protection, vulcabond and polyether Glycols reaction are made performed polymer; add 1 again; 4-butyleneglycol and cage-type silsesquioxane fully react as chainextender; pass through chemical bonding; prepare the modified polyurethane of film-forming properties base excellent heat resistance, improved the wear resistance of conventional urethane and the defective of poor heat resistance.When hydroxyl cage-type silsesquioxane content is increased to 10% from 0, the polyurethane glass transition temperature of modification is elevated to 33.5 ℃ from 28.8 ℃, 4.7 ℃ have been improved, melt temperature also is elevated to 54.5 ℃ from 44.3 ℃, improved 10.2 ℃, and the heat decomposition temperature of modified polyurethane 35.3 ℃ and 11.9 ℃ have also been improved respectively.But this method is only studied the thermotolerance aspect, to the snappiness of material after pyroprocessing, and not research aspect the flexibility of the ground of cold carrying material.And the used polyether Glycols of this material is polyoxyethylene glycol, and the snappiness of the resin of this material preparation and hydrolytic resistance are not good, as using little being suitable on the garment material.This patent is just more coarse is in addition carrying out simple experiment to this siloxanes aspect the thermotolerance, other required performances of garment material are not carried out comprehensive analysis, also not to the result of the aspect that wets thoroughly.
General general polyurethane products temperature tolerance is poor, and paint film oxidation hardening becomes fragile under hot conditions.The isocyanic ester that uses in the general polyurethane material is common MDI, TDI etc., and the good mechanical properties of these aromatic urethane materials, but thermotolerance is poor, and the high temperature hardening that becomes fragile, and xanthochromia influence the physicals of product.
Ammonia ester bond in aliphatics and the alicyclic isocyanate is more stable, is difficult for the oxidation yellowing.But aliphatic isocyanates does not have the conjugative effect of phenyl ring, and reactive behavior is low, needs to improve temperature of reaction and preferred catalyst.In addition the hydrolytic resistance of aliphatics and alicyclic isocyanate polyurethane material might as well, the ageing-resistant performance of product is good.
General the heat-resisting of material is to obtain by two kinds of methods.Add heat-resisting filler, perhaps start with from molecular structure, by the heat-resisting group of response type function and polyurethane material generation chemical reaction.The former material is restricted, and is inapplicable for the film like coating, can be hard behind the adding filler, and filler and the just effect of physics of urethane itself, to separate out easily, mechanical property is also poor.The latter has fundamentally changed the performance of material, by the introducing of heat-resisting group, improves the resistance toheat of material.
Summary of the invention
The purpose of this invention is to provide and a kind ofly have in the time of to tolerate the coating stamp 200 ~ 230 ℃, the characteristic of time length 30S, it is saturating to be coated with floor height, soft smooth, water-fastness, be fit to very much the direct coating of dry goods coating processing and the special-purpose high temperature resistant waterproof air-moisture-permeable of the coating stamp resin of coating printing technology.The special-purpose high temperature resistant waterproof air-moisture-permeable of this coating stamp resin molecular-weight average is 50000 ~ 150000g/mol, and viscosity is 60000 ~ 100000cps/25 ℃, and the solid content of resin is 30 ~ 55%.
Another object of the present invention provides the preparation method of the special-purpose high temperature resistant waterproof air-moisture-permeable of above-mentioned coating stamp resin.
The objective of the invention is to realize in the following manner:
The special-purpose high temperature resistant waterproof air-moisture-permeable of a kind of coating stamp resin, this resin is prepared by following method: with 80 ~ 220 weight part polyether alkylol cpds, 20 ~ 80 weight part diisocyanate cpds and the mixing of 30 ~ 100 parts by weight solvent obtain mixture, the organo-bismuth that drips mixture total weight amount 0.1% is then made catalyzer, the glycols chainextender of 1-10 weight part, reaction is 0.5 ~ 1.5 hour in the time of 50 ~ 70 ℃, obtain prepolymer, add cage-type silsesquioxane then and react 4-5h, add 0.5 ~ 1 weight part terminator and other auxiliary agents, adjusting to the material solid content with solvent is 30-55%, viscosity is 60000 ~ 100000cps/25 ℃, stirs cooling.
Described polyether alkylol cpd is the mixture of glycol polypropylene and polyoxyethylene glycol, and molecular-weight average is 2000 ~ 10000, and the weight ratio of the two is 1.5:1 ~ 1:3.
Described diisocyanate cpd is the mixture of hexa-methylene-hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI), and the weight ratio of the two is 1:1 ~ 1:2.
Described glycols chainextender is one or more combinations in butyleneglycol, neopentyl glycol, the ethylene glycol.
Described terminator is one or more combinations of methyl alcohol, butanols, isopropylcarbinol, propylene glycol monomethyl ether.
Described other auxiliary agents are that hold back agent is or/and stablizer; Hold back agent is one or both combinations in Benzoyl chloride, the lauryl mercaptan; Stablizer is UV-327, UV-531, UV-1165,, one or more combination among the UV-510.
Described organic solvent is the one or more combination in toluene, butanone, vinyl acetic monomer, N-BUTYL ACETATE, the N,N-DIMETHYLACETAMIDE.
Described cage-type silsesquioxane is the one or more combination of poly-hydroxy-phenyl cage-type silsesquioxane.Described cage-type silsesquioxane is 1 ~ 10% of prepolymer weight, is preferably 3 ~ 8% of prepolymer weight.
The preparation method of the special-purpose high temperature resistant waterproof air-moisture-permeable of above-mentioned coating stamp resin may further comprise the steps: with 80 ~ 220 weight part polyether alkylol cpds, 20 ~ 80 weight part diisocyanate cpds and the mixing of 30 ~ 100 parts by weight solvent obtain mixture, the organo-bismuth that drips mixture total weight amount 0.1% is then made catalyzer, the glycols chainextender of 1-10 weight part, reaction is 0.5 ~ 1.5 hour in the time of 50 ~ 70 ℃, obtain prepolymer, add cage-type silsesquioxane then and react 4-5h, add 0.5 ~ 1 weight part terminator and other auxiliary agents, adjusting to the material solid content with solvent is 30-55%, viscosity is 60000 ~ 100000cps/25 ℃, stirs cooling.
The molecular-weight average of resin of the present invention is 50000 ~ 150000g/mol, and viscosity is 60000 ~ 100000cps/25 ℃, and the solid content of urethane resin is 30 ~ 55%.
The special-purpose high temperature resistant waterproof air-moisture-permeable of the coating stamp of gained resin is the solvent-borne type product of urethane among the present invention, by the volatilization formation coating of solvent; The thermotolerance of siloxane groups is relatively good, the flexibility of product might as well, general silicone compositions does not have hydroxyl, thermotolerance is also poor, and dihydroxyl-seven phenyl cage-type silsesquioxane or trihydroxy--seven iso-octyl cage-type silsesquioxane have hydroxyl can with isocyanate reaction, and this material consistency heat-resisting and polyurethane material itself is good, reactive good, be a kind of high performance heat resistant material with premium properties.
The present invention takes in the presence of catalyzer polyether Glycols and di-isocyanate reaction to be obtained prepolymer earlier, adding hydroxyl cage-type silsesquioxane and di-alcohols then reacts as chainextender, the product of preparing has good thermotolerance, can adapt to 200 ~ 230 ℃, the stamp demand of time length 30S.And the paint film softness, saturating wet, waterproof, hydrolysis can be used as direct coating and transfer coated use technology.Because the hydroxyl cage-type silsesquioxane is organic-inorganic nanocomposite among the present invention, namely have like hydroxyl and the di-alcohols simultaneously, have the high thermotolerance of inorganic materials again, therefore can prepare the good modified polyurethane of thermotolerance.Along with hydroxyl cage-type silsesquioxane content increases, the second-order transition temperature of gained material increases, and the flexible aspect of material then descends gradually, the comfort variation, so the content optimum of hydroxyl cage-type silsesquioxane is 3 ~ 8%.
Urethane resin by the inventive method obtains has 200 ~ 230 ℃ of heatproofs, the characteristic of time length 30S, 230 ℃ of tests by lasting 60S, the elongation at break 1000% of material before the high temperature, elongation at break is 800% behind the high temperature, satisfies the requirement greater than 500%.
Material of the present invention has good weathering resistance, wets characteristics such as hydrolytic resistance thoroughly.According to " mensuration of coated fabric water permeability resistance (FZ/T01004-2008) method is tested, and uses the fabric water pressure resistance intensity of ordinary resin coating can reach 6000～10200Pa, uses the fabric water pressure resistance intensity of this coating to be higher than 11000Pa.Test according to " mensuration of coated fabric resistance to blocking (FZ/T 01063-2008) " method, use the resistance to blocking of fabric of resin provided by the present invention good.According to the Water Vapour Permeability test of the fabric coating of Japanese JIS L1099A-1, this method the Water Vapour Permeability of resin can be up to 7500g/m
2.24h.
Beneficial effect of the present invention compared with the prior art: the present invention compares tool with the material of existing high temperature resistant stamp
There are in the time of can tolerating the coating stamp 200 ~ 230 ℃, the characteristic of time length 30S, it is saturating to be coated with floor height, soft smooth, water-fastness, is fit to very much direct coating and the coating stamp of dry goods coating processing.Described dry goods can be natural or regenerated fiber is made weaves cotton cloth or non woven fabric.
Embodiment
Below describe technical scheme of the present invention in detail.
Embodiment 1:
180 weight part molecular weight are 2000 glycol polypropylene and polyoxyethylene glycol, the mass ratio of the two is 1.5:1,40 weight part HDI and IPDI weight ratio are the mixture of 1:1,50 parts by weight of toluene and N,N-DIMETHYLACETAMIDE weight ratio are the mixture of 1:1, drip the organo-bismuth of said mixture gross weight 0.1%, add 10 weight parts 1,4 chain expansion of succinic acid agent, react 1h at 65 ℃ after the above material mixing, obtain prepolymer, dihydroxyl-seven phenyl the cage-type silsesquioxane that adds prepolymer weight 7% then reacts 4h, add 0.5 weight part methyl alcohol terminator then, 2 weight part UV-327 stablizers are that to adjust material be 30% to solid content for the solvent of 1:1 with the part by weight of toluene and vinyl acetic monomer, the viscosity of material is 60000cps/25 ℃, and molecular weight is 50000g/mol.Cooling back discharging stirs.
The material that embodiment 1 is made is coated with in accordance with the following methods: adopting primer viscosity is 25 ℃ of 50000 ~ 100000cps, carries out blade coating at base fabric, the primer spread be 18 ~ 30 grams/square metre, the cloth that is coated with primer dries by the fire 60S in 120 ℃ of baking ovens.The oven dry primer cloth be coated with above glue, the amount of face glue be 20 ~ 30 the gram/square metre.In 160 ℃ of baking ovens, toast 60S after being coated with face glue.Survey enters elongation at break and saturating the wetting of 230 ℃ of 60S front and back materials, and is withstand voltage.Elongation at break before the high temperature is 1100%, the saturating wet 7500g/m that is
2.24h, water pressure resistance (ISO811.1981 method) is 10000mmH
20.The elongation at break of material is 900% behind the high temperature, the saturating wet 5700g/m that is
2.24h, water pressure resistance is 85000mmH
20.
Embodiment 2:
180 weight part molecular weight are 3000 glycol polypropylene and polyoxyethylene glycol, and the mass ratio of the two is 1.5:1.44 weight part HDI and IPDI weight ratio are the mixture of 1:1.The mixture of 50 parts by weight of toluene and N,N-DIMETHYLACETAMIDE 1:1, drip the organo-bismuth of said mixture gross weight 0.1%, 1 weight part 1,4 chain expansion of succinic acid agent, react 1h at 65 ℃ after the above material mixing, obtain prepolymer, dihydroxyl-seven phenyl the cage-type silsesquioxane that adds prepolymer weight 10% then, at 65 ℃ of reaction 4h, add 0.5 weight part methyl alcohol terminator, 2 weight part UV-531 stablizers, with part by weight be the toluene of 1:1 and vinyl acetic monomer to adjust to the material solid content be 30%, the viscosity of material is 80000cps/25 ℃, molecular weight is 60000g/mol.Cooling back discharging stirs.
The material that example 2 is made is coated with according to the method for embodiment 1, surveys the elongation at break that enters materials before and after 230 ℃ of 60S and saturating wet, withstand voltage.Elongation at break before the high temperature is 1000%, the saturating wet 6800g/m that is
2.24h, water pressure resistance is 11500mmH
20.Elongation at break is 800% behind the high temperature, the saturating wet 6000g/m that is
2.24h, water pressure resistance is 87000mmH
20.
Embodiment 3:
220 weight part molecular weight are 3000 glycol polypropylene and polyoxyethylene glycol, the mass ratio of the two is 1:3,43 weight part weight ratios are HDI and the IPDI mixture of 1:2, the mixture of 50 parts by weight of toluene and N,N-DIMETHYLACETAMIDE 1:1, drip the organo-bismuth of said mixture gross weight 0.1%, 5 weight part neopentyl glycol chainextenders, react 1h at 65 ℃ after the above material mixing, obtain prepolymer, dihydroxyl-seven phenyl the cage-type silsesquioxane that adds prepolymer weight 10% then, at 65 ℃ of reaction 5h, add 0.5 weight part methyl alcohol terminator, 2 weight part UV-510 stablizers, with part by weight be 1:1 toluene and vinyl acetic monomer to adjust to the material solid content be 30%, viscosity is 95000cps/25 ℃, molecular weight is 80000g/mol.Cooling back discharging stirs.
The material that example 3 is made is coated with according to the method for embodiment 1, surveys the elongation at break that enters materials before and after 230 ℃ of 60S and saturating wet, withstand voltage.Elongation at break before the high temperature is 1300%, the saturating wet 6600g/m that is
2.24h, water pressure resistance is 11500mmH
20.Elongation at break is 900% behind the high temperature, the saturating wet 6000g/m that is
2.24h, water pressure resistance is 9000mmH
20.
Claims (10)
1. the special-purpose high temperature resistant waterproof air-moisture-permeable of coating stamp resin, it is characterized in that this resin is prepared by following method: with 80 ~ 220 weight part polyether alkylol cpds, 20 ~ 80 weight part diisocyanate cpds and the mixing of 30 ~ 100 parts by weight solvent obtain mixture, the organo-bismuth that drips mixture total weight amount 0.1% is then made catalyzer, the glycols chainextender of 1-10 weight part, reaction is 0.5 ~ 1.5 hour in the time of 50 ~ 70 ℃, obtain prepolymer, add cage-type silsesquioxane then and react 4-5h, add 0.5 ~ 1 weight part terminator and other auxiliary agents, adjusting to the material solid content with solvent is 30-55%, viscosity is 60000 ~ 100000cps/25 ℃, stirs cooling.
2. the special-purpose high temperature resistant waterproof air-moisture-permeable of coating stamp according to claim 1 resin, it is characterized in that described polyether alkylol cpd is the mixture of polypropylene glycol and polyoxyethylene glycol, molecular-weight average is all 2000 ~ 10000, and the weight ratio of the two is 1.5:1 ~ 1:3.
3. the special-purpose high temperature resistant waterproof air-moisture-permeable of coating stamp according to claim 1 resin, it is characterized in that described diisocyanate cpd is hexa-methylene-1, the mixture of hexamethylene-diisocyanate and isophorone diisocyanate, the weight ratio of the two are 1:1 ~ 1:2.
4. the special-purpose high temperature resistant waterproof air-moisture-permeable of coating stamp according to claim 1 resin is characterized in that described glycols chainextender is one or more combinations in butyleneglycol, neopentyl glycol, the ethylene glycol.
5. the special-purpose high temperature resistant waterproof air-moisture-permeable of coating stamp according to claim 1 resin is characterized in that described terminator is one or more combinations of methyl alcohol, butanols, isopropylcarbinol, propylene glycol monomethyl ether.
6. the special-purpose high temperature resistant waterproof air-moisture-permeable of coating stamp according to claim 1 resin is characterized in that described other auxiliary agents are that hold back agent is or/and stablizer; Hold back agent is one or both combinations in Benzoyl chloride, the lauryl mercaptan, and consumption is 5 ~ 10 weight parts; Stablizer is UV-327, UV-531, UV-1165,, one or more combination among the UV-510, consumption is 2 ~ 5 weight parts.
7. the special-purpose high temperature resistant waterproof air-moisture-permeable of coating stamp according to claim 1 resin is characterized in that described organic solvent is the one or more combination in toluene, butanone, vinyl acetic monomer, N-BUTYL ACETATE, the N,N-DIMETHYLACETAMIDE.
8. the special-purpose high temperature resistant waterproof air-moisture-permeable of coating stamp according to claim 1 resin is characterized in that described cage-type silsesquioxane is the one or more combination of poly-hydroxy-phenyl cage-type silsesquioxane.
9. the special-purpose high temperature resistant waterproof air-moisture-permeable of coating stamp according to claim 1 resin is characterized in that described cage-type silsesquioxane is 1 ~ 10% of prepolymer weight.
10. the preparation method of the special-purpose high temperature resistant waterproof air-moisture-permeable of the described coating stamp of a claim 1 resin, it is characterized in that this method may further comprise the steps: with 80 ~ 220 weight part polyether alkylol cpds, 20 ~ 80 weight part diisocyanate cpds and the mixing of 30 ~ 100 parts by weight solvent obtain mixture, the organo-bismuth that drips mixture total weight amount 0.1% is then made catalyzer, the glycols chainextender of 1-10 weight part, reaction is 0.5 ~ 1.5 hour in the time of 50 ~ 70 ℃, obtain prepolymer, add cage-type silsesquioxane then and react 4-5h, add 0.5 ~ 1 weight part terminator and other auxiliary agents, adjusting to the material solid content with solvent is 30-55%, viscosity is 60000 ~ 100000cps/25 ℃, stirs cooling.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103467693A (en) * | 2013-09-25 | 2013-12-25 | 江苏华夏制漆科技有限公司 | Preparation method of waterborne polyurethane with excellent freeze-thawing stability |
| CN103467687A (en) * | 2013-09-25 | 2013-12-25 | 江苏华夏制漆科技有限公司 | Preparation method of solvent-free waterborne polyurethane resin |
| CN103741471A (en) * | 2013-12-17 | 2014-04-23 | 江苏金太阳纺织科技有限公司 | Heatproof oilcloth and preparation method thereof |
| CN103741490A (en) * | 2013-12-30 | 2014-04-23 | 辽宁恒星精细化工有限公司 | Tear-resistant finishing agent for pure cotton woven fabric and preparation method thereof |
| CN104452307A (en) * | 2014-12-15 | 2015-03-25 | 辽宁恒星精细化工有限公司 | Breathable ultraviolet-resistant anti-static polyurethane resin coating adhesive and preparation method thereof |
| CN105924613A (en) * | 2016-06-07 | 2016-09-07 | 江苏东邦科技有限公司 | Preparation process of polyurethane resin for spandex fabric |
| CN110344271A (en) * | 2019-08-07 | 2019-10-18 | 湖州五兴达丝绸整理有限公司 | A kind of waterproof calico coating process |
| CN110423456A (en) * | 2019-08-13 | 2019-11-08 | 湖南工业大学 | A kind of preparation method of high intensity dual network biomass membrane material |
| CN115260444A (en) * | 2022-06-15 | 2022-11-01 | 盛鼎高新材料有限公司 | Casting type high-temperature-resistant polyurethane elastomer and preparation method thereof |
| CN116732637A (en) * | 2023-08-14 | 2023-09-12 | 烟台舜康生物科技有限公司 | Preparation method of high-elasticity spandex |
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| US20080108773A1 (en) * | 2006-11-06 | 2008-05-08 | Wicks Douglas A | Polyurethane dispersions containing POSS nanoparticles |
| CN102617823A (en) * | 2012-03-29 | 2012-08-01 | 合肥工业大学 | Process for preparing hydroxyl polyhedral oligomeric silsesquioxane modified polyurethane |
Cited By (13)
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|---|---|---|---|---|
| CN103467687B (en) * | 2013-09-25 | 2015-07-01 | 江苏华夏制漆科技有限公司 | Preparation method of solvent-free waterborne polyurethane resin |
| CN103467687A (en) * | 2013-09-25 | 2013-12-25 | 江苏华夏制漆科技有限公司 | Preparation method of solvent-free waterborne polyurethane resin |
| CN103467693B (en) * | 2013-09-25 | 2016-05-25 | 江苏华夏制漆科技有限公司 | A kind of preparation method of the aqueous polyurethane with good freeze/thaw stability |
| CN103467693A (en) * | 2013-09-25 | 2013-12-25 | 江苏华夏制漆科技有限公司 | Preparation method of waterborne polyurethane with excellent freeze-thawing stability |
| CN103741471A (en) * | 2013-12-17 | 2014-04-23 | 江苏金太阳纺织科技有限公司 | Heatproof oilcloth and preparation method thereof |
| CN103741490B (en) * | 2013-12-30 | 2016-01-13 | 辽宁恒星精细化工有限公司 | Textile shuttle-woven fabric anti tear finishing agent and preparation method |
| CN103741490A (en) * | 2013-12-30 | 2014-04-23 | 辽宁恒星精细化工有限公司 | Tear-resistant finishing agent for pure cotton woven fabric and preparation method thereof |
| CN104452307A (en) * | 2014-12-15 | 2015-03-25 | 辽宁恒星精细化工有限公司 | Breathable ultraviolet-resistant anti-static polyurethane resin coating adhesive and preparation method thereof |
| CN105924613A (en) * | 2016-06-07 | 2016-09-07 | 江苏东邦科技有限公司 | Preparation process of polyurethane resin for spandex fabric |
| CN110344271A (en) * | 2019-08-07 | 2019-10-18 | 湖州五兴达丝绸整理有限公司 | A kind of waterproof calico coating process |
| CN110423456A (en) * | 2019-08-13 | 2019-11-08 | 湖南工业大学 | A kind of preparation method of high intensity dual network biomass membrane material |
| CN115260444A (en) * | 2022-06-15 | 2022-11-01 | 盛鼎高新材料有限公司 | Casting type high-temperature-resistant polyurethane elastomer and preparation method thereof |
| CN116732637A (en) * | 2023-08-14 | 2023-09-12 | 烟台舜康生物科技有限公司 | Preparation method of high-elasticity spandex |
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Application publication date: 20130828 |