CN113072676A - Low-temperature flexible polyurethane coating resin for clothes and preparation method thereof - Google Patents
Low-temperature flexible polyurethane coating resin for clothes and preparation method thereof Download PDFInfo
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- CN113072676A CN113072676A CN202110324154.6A CN202110324154A CN113072676A CN 113072676 A CN113072676 A CN 113072676A CN 202110324154 A CN202110324154 A CN 202110324154A CN 113072676 A CN113072676 A CN 113072676A
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- coating resin
- low
- polyurethane coating
- flexible polyurethane
- temperature flexible
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- 239000011527 polyurethane coating Substances 0.000 title claims abstract description 23
- 229920005989 resin Polymers 0.000 title claims abstract description 23
- 239000011347 resin Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000004814 polyurethane Substances 0.000 claims abstract description 24
- 229920002635 polyurethane Polymers 0.000 claims abstract description 24
- 239000000839 emulsion Substances 0.000 claims abstract description 19
- 239000004744 fabric Substances 0.000 claims description 16
- 229920005906 polyester polyol Polymers 0.000 claims description 14
- 229920005862 polyol Polymers 0.000 claims description 14
- 150000003077 polyols Chemical class 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 239000012948 isocyanate Substances 0.000 claims description 13
- 150000002513 isocyanates Chemical class 0.000 claims description 13
- 229920000570 polyether Polymers 0.000 claims description 13
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 12
- 239000004970 Chain extender Substances 0.000 claims description 10
- 239000003963 antioxidant agent Substances 0.000 claims description 9
- 230000003078 antioxidant effect Effects 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 9
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims description 7
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims description 5
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 5
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 4
- 239000004472 Lysine Substances 0.000 claims description 4
- KDXKERNSBIXSRK-UHFFFAOYSA-N Lysine Natural products NCCCCC(N)C(O)=O KDXKERNSBIXSRK-UHFFFAOYSA-N 0.000 claims description 4
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 4
- KXBFLNPZHXDQLV-UHFFFAOYSA-N [cyclohexyl(diisocyanato)methyl]cyclohexane Chemical compound C1CCCCC1C(N=C=O)(N=C=O)C1CCCCC1 KXBFLNPZHXDQLV-UHFFFAOYSA-N 0.000 claims description 4
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 4
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 4
- 230000003472 neutralizing effect Effects 0.000 claims description 4
- UEEJHVSXFDXPFK-UHFFFAOYSA-O N-dimethylethanolamine Chemical compound C[NH+](C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-O 0.000 claims description 3
- 239000008118 PEG 6000 Substances 0.000 claims description 3
- 229920002584 Polyethylene Glycol 6000 Polymers 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 3
- 238000004945 emulsification Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000006386 neutralization reaction Methods 0.000 claims description 2
- 238000003786 synthesis reaction Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 239000012855 volatile organic compound Substances 0.000 description 4
- WYQZDQZBXHWQMW-UHFFFAOYSA-N 3-methylhexane-2,2-diamine Chemical compound CCCC(C)C(C)(N)N WYQZDQZBXHWQMW-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 241000272525 Anas platyrhynchos Species 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical compound CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
- C08G18/4018—Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4236—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups
- C08G18/4238—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups derived from dicarboxylic acids and dialcohols
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4825—Polyethers containing two hydroxy groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
- D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
- D06N3/146—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes characterised by the macromolecular diols used
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2203/00—Macromolecular materials of the coating layers
- D06N2203/06—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06N2203/068—Polyurethanes
Abstract
The scheme relates to a low-temperature flexible polyurethane coating resin for clothes and a preparation method thereof. The invention uses the waterborne polyurethane, has no VOC emission in the whole preparation process and is more environment-friendly; when the aqueous polyurethane emulsion prepared by the invention is used on a down coat, the aqueous polyurethane emulsion shows better characteristics of lightness, thinness and softness at low temperature; the waterborne polyurethane prepared by the invention has low cost, high economic value and easy operation.
Description
Technical Field
The invention belongs to the technical field of polyurethane resin preparation, and particularly relates to low-temperature flexible polyurethane coating resin for clothes and a preparation method thereof.
Background
With the improvement of living standard of people, a plurality of consumers no longer just meet the warm keeping function of the down jackets, and the color, style, hand feeling, weight and the like of the down jackets guide the development trend of the consumer market. These properties are most important, particularly, the lightness and softness of down jackets. The light and thin fabric is lighter and better in texture, so that the quality of the whole down jacket can be reduced to a certain degree, and the down jacket is light and comfortable to wear. Soft means that the down jacket will not feel hard to the touch, while some down jackets in the market feel hard obviously. The main raw materials for preparing the down jacket comprise filled duck down, lining cloth, polyurethane fabric for preventing the duck down from leaking and coating resin on the surface of the fabric. Among them, the polyurethane coating resin is most widely used, and has a crucial influence on the surface hand feeling of the down jacket. The influence of the cold and hot temperature on the hand feeling of the down jacket exists all the time, and the development of polyurethane resin which has two important qualities of lightness and thinness and no hardening of hand feeling at low temperature is of great importance to the upgrading of the down jacket market industry.
Disclosure of Invention
Aiming at the defect that the polyurethane coating resin on the surface of the down jacket fabric in the existing market has hard hand feeling at low temperature, the invention aims to provide a novel preparation process for preparing the polyurethane coating resin capable of being soft at low temperature.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of low-temperature flexible polyurethane coating resin for clothes comprises the following steps:
1) preparation of a prepolymer: putting a certain proportion of polyester polyol and polyether polyol into a reaction kettle, adding an antioxidant and isocyanate, fully stirring uniformly, and reacting at 70-80 ℃ until the mass fraction of the isocyanate is maintained between 7-10%;
2) synthesis of resin: after the reaction in the step 1) is finished, adding a proper amount of chain extender into the reaction kettle, and continuously reacting until the mass fraction of isocyanate in the system is about 4-6%;
3) and (3) neutralization reaction: after the step 2) is finished, cooling to 45 ℃, and adding a neutralizer for reacting for 20 min;
4) adding water into the step 3) under a high shearing force for emulsification and dispersion to obtain a water-based polyurethane emulsion;
5) the prepared waterborne polyurethane emulsion is taken as a main agent, a curing agent is added, and the waterborne polyurethane emulsion is coated on the surface of clothes fabric to be cured to form polyurethane coating resin.
Further, the polyester polyol is preferably one or any combination of PEBA-8000, PENA-8000, PNA-6000 and PBA-6000.
Further, the polyether polyol is preferably one or more of PPG-8000, PPG-6000, PTMG-4000 and PEG-6000.
Further, the isocyanate is preferably any one or a combination of two of isophorone diisocyanate, hexamethylene diisocyanate, and dicyclohexylmethane diisocyanate.
Further, the chain extender is preferably any one or two of lysine, 1, 4-butanediol, 2-dimethylolpropionic acid and dimethyl pentanediamine.
Further, the neutralizing agent is preferably one or a combination of two of triethylamine, N-dimethylethanolamine, diethanolamine, and triethanolamine.
Further, the polyester polyol, the polyether polyol, the antioxidant, the isocyanate, the chain extender and the neutralizer respectively account for 10-20%, 1-3%, 5-15%, 1-3% and 1-4% of the total feeding mass ratio, and the total amount of water is 100%.
The invention provides a low-temperature flexible polyurethane coating resin for clothes, which is prepared by the preparation method.
According to the invention, the polyester polyol and the polyether polyol are mixed, and the chain extender, the neutralizer and the like are matched to prepare the aqueous polyurethane emulsion, the specific long-chain polyether and the polyester polyol are mixed, the polyol with a long-chain structure has better low-temperature flexibility, and the defect of stronger crystallinity of single polyol is effectively avoided by mixing the polyester polyol, so that the prepared polyurethane coating is softer and has light weight. Adding a curing agent into the polyurethane emulsion, coating the polyurethane emulsion on the surface of the down jacket fabric, and curing to form a polyurethane coating; the finally prepared down coat has the characteristic of soft hand feeling.
The invention has the beneficial effects that: the traditional polyurethane coating resin for down jackets is mostly solvent-based, and the invention uses aqueous polyurethane, so that no VOC (volatile organic compounds) is discharged in the whole preparation process, and the down jacket is more environment-friendly; when the aqueous polyurethane emulsion prepared by the invention is used on a down coat, the aqueous polyurethane emulsion shows better characteristics of lightness, thinness and softness at low temperature; the waterborne polyurethane prepared by the invention has low cost, high economic value and easy operation.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Preparation process
Putting a certain amount of polyester polyol and polyether polyol into a reaction kettle, adding an antioxidant 1010 and isocyanate, fully stirring uniformly, and reacting in a water bath condition at 80 ℃ until the mass fraction of NCO is 7-10%. After the reaction is finished, adding a proper amount of chain extender into the reaction kettle, and continuously reacting until the mass fraction of NCO in the system is about 4-6%. Then cooling to 45 deg.C, adding neutralizing agent and reacting for about 20 min. And then adding water under high shearing force to carry out emulsification and dispersion to obtain polyurethane emulsion with solid content of 50%. The waterborne polyurethane emulsion prepared by the invention is used as a main agent, and a curing agent is added, so that the waterborne polyurethane emulsion is used on a down coat, and the light and thin performance and the soft performance under cold conditions are tested.
Wherein, the polyester polyol is preferably one or the combination of any more of PEBA-8000, PENA-8000, PNA-6000 and PBA-6000.
Wherein, the polyether polyol is preferably one or the combination of more of PPG-8000, PPG-6000, PTMG-4000 and PEG-6000.
The isocyanate is preferably any one or a combination of two of isophorone diisocyanate, hexamethylene diisocyanate and dicyclohexylmethane diisocyanate.
Wherein, the chain extender is preferably one or two of lysine, 1, 4-butanediol, 2-dimethylolpropionic acid and dimethyl pentanediamine.
Wherein, the neutralizing agent is preferably one or two of triethylamine, N-dimethylethanolamine, diethanolamine and triethanolamine.
The polyester polyol, the polyether polyol, the antioxidant, the isocyanate, the chain extender and the neutralizer respectively account for 10-20%, 1-3%, 5-15%, 1-3% and 1-4% of the total feeding mass ratio, and the total amount of water is 100%.
The present application provides the following specific examples:
example 1: 860g of PEBA-8000150 g, PPG-8000150 g, antioxidant 101010 g, isophorone diisocyanate 100g, lysine 20g, triethylamine 10g and deionized water 420g in total.
Example 2: 860g of PENA-8000150 g, 6000150 g of PEG-6000150 g, 101010 g of antioxidant, 98g of hexamethylene diisocyanate, 17g of 1, 4-butanediol, 15g of N, N-dimethylethanolamine and 430g of deionized water in total.
Example 3: PNA-6000150 g, PTMG-4000150 g, antioxidant 101010 g, dicyclohexylmethane diisocyanate 103g, 2-dimethylolpropionic acid 19g, diethanolamine 8g, deionized water 430g for 860g in total.
Example 4: 860g of PBA-6000150 g, 6000150 g of PEG-6000150 g, 101010 g of antioxidant, 95g of hexamethylene diisocyanate, 21g of dimethyl pentanediamine, 14g of triethanolamine and 430g of deionized water in total.
For comparison, the polyether polyol of examples 1-4 was removed and the amount of polyester polyol was increased accordingly to obtain corresponding comparative examples 1-4.
Measurement of Performance
The aqueous polyurethane emulsion thus synthesized was coated on the surface of a base fabric for down jackets with the addition of a curing agent CW-20 (Wawawa chemical), and the characteristics such as lightness and thinness and softness under cold conditions were evaluated.
Under the condition of room temperature, the waterborne polyurethane emulsion prepared by the invention is mixed with a curing agent CW-20 according to the mol ratio of NCO/OH which is 1: 1, the mixture is uniformly stirred by a glass rod and coated on the surface of a base cloth for down jackets, and then a layer of dry fabric is attached on the base cloth, thus obtaining the polyurethane coating for the down jackets. And putting the down jacket fabric into a refrigeration house with the temperature of-15 ℃, freezing for 24h, and taking out the down jacket fabric to test the softness, namely the frozen down jacket fabric can not become hard.
TABLE 1
| Examples | Softness at-15 ℃ | Lightness and thinness |
| Example 1 | Softness | Do not pass through |
| Example 2 | Softness | By passing |
| Example 3 | Softness | By passing |
| Example 4 | Softness | By passing |
| Comparative example 1 | Stiffness of the skin | Do not pass through |
| Comparative example 2 | Stiffness of the skin | By passing |
| Comparative example 3 | Stiffness of the skin | By passing |
| Comparative example 4 | Stiffness of the skin | By passing |
As shown in Table 1, the polyurethane emulsion is prepared by combining the long-chain polyester polyol and the polyether polyol and taking water as a solvent, is free from VOC (volatile organic compounds) emission and environment-friendly, is coated on the surface of fabric to form a coating, has certain softness and lightness, and can still keep the softness at the low temperature of-15 ℃.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
Claims (8)
1. A preparation method of low-temperature flexible polyurethane coating resin for clothes is characterized by comprising the following steps:
1) preparation of a prepolymer: putting a certain proportion of polyester polyol and polyether polyol into a reaction kettle, adding an antioxidant and isocyanate, fully stirring uniformly, and reacting at 70-80 ℃ until the mass fraction of the isocyanate is maintained between 7-10%;
2) synthesis of resin: after the reaction in the step 1) is finished, adding a proper amount of chain extender into the reaction kettle, and continuously reacting until the mass fraction of isocyanate in the system is about 4-6%;
3) and (3) neutralization reaction: after the step 2) is finished, cooling to 45 ℃, and adding a neutralizer for reacting for 20 min;
4) adding water into the step 3) under a high shearing force for emulsification and dispersion to obtain a water-based polyurethane emulsion;
5) the prepared waterborne polyurethane emulsion is taken as a main agent, a curing agent is added, and the waterborne polyurethane emulsion is coated on the surface of clothes fabric to be cured to form polyurethane coating resin.
2. The method for preparing low-temperature flexible polyurethane coating resin for clothing according to claim 1, wherein the polyester polyol is selected from one or any combination of PEBA-8000, PENA-8000, PNA-6000 and PBA-6000.
3. The method for preparing a low-temperature flexible polyurethane coating resin for clothing according to claim 1, wherein the polyether polyol is one or more selected from the group consisting of PPG-8000, PPG-6000, PTMG-4000 and PEG-6000.
4. The method for preparing a low-temperature flexible polyurethane coating resin for clothing according to claim 1, wherein the isocyanate is any one or a combination of two of isophorone diisocyanate, hexamethylene diisocyanate and dicyclohexylmethane diisocyanate.
5. The method for preparing a low-temperature flexible polyurethane coating resin for clothing according to claim 1, wherein the chain extender is one or a combination of two selected from the group consisting of lysine, 1.4-butanediol, 2.2-dimethylolpropionic acid and dimethylpentyldiamine.
6. The method for preparing a low-temperature flexible polyurethane coating resin for clothing according to claim 1, wherein the neutralizing agent is one or a combination of two selected from the group consisting of triethylamine, N-dimethylethanolamine, diethanolamine and triethanolamine.
7. The method for preparing the low-temperature flexible polyurethane coating resin for the clothes as claimed in claim 1, wherein the polyester polyol, the polyether polyol, the antioxidant, the isocyanate, the chain extender and the neutralizer respectively account for 10-20%, 1-3%, 5-15%, 1-3% and 1-4% of the total feeding mass ratio, and the water is added to total 100%.
8. A low-temperature flexible polyurethane coating resin for clothes prepared by the preparation method according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110324154.6A CN113072676A (en) | 2021-03-26 | 2021-03-26 | Low-temperature flexible polyurethane coating resin for clothes and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110324154.6A CN113072676A (en) | 2021-03-26 | 2021-03-26 | Low-temperature flexible polyurethane coating resin for clothes and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113072676A true CN113072676A (en) | 2021-07-06 |
Family
ID=76610400
Family Applications (1)
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Application publication date: 20210706 |