Carboxylate type waterborne polyurethane fabric coating agent based on polyester/polyether and preparation method thereof
阅读说明：本技术 一种基于聚酯/聚醚的羧酸盐型水性聚氨酯织物涂层剂及其制备方法 (Carboxylate type waterborne polyurethane fabric coating agent based on polyester/polyether and preparation method thereof ) 是由 孙东成 胡瑶瑛 于 2021-07-19 设计创作，主要内容包括：本发明公开了一种基于聚酯/聚醚的羧酸盐型水性聚氨酯织物涂层剂及其制备方法。该制备方法包括以下步骤：1)水性聚氨酯的合成：将聚酯二元醇、聚醚二元醇和二异氰酸酯反应,获得聚氨酯预聚体；用溶剂降低预聚体粘度后,分别加入扩链剂A、羧酸盐亲水单体和扩链剂B；加水分散、减压抽除溶剂后获得水性聚氨酯分散体。2)织物涂层剂的配制：将1)中所制得的水性聚氨酯加入交联剂、增稠剂、流平剂和消泡剂配制成织物涂层剂。该法制得的水性聚氨酯织物涂层剂手感好有弹力,耐水压高,同时具有透湿的特点,并且安全环保,可应用于纺织领域。(The invention discloses a carboxylate type waterborne polyurethane fabric coating agent based on polyester/polyether and a preparation method thereof. The preparation method comprises the following steps: 1) synthesis of waterborne polyurethane: reacting polyester diol, polyether diol and diisocyanate to obtain a polyurethane prepolymer; after the viscosity of the prepolymer is reduced by using a solvent, a chain extender A, a carboxylate hydrophilic monomer and a chain extender B are respectively added; adding water for dispersion, and removing the solvent under reduced pressure to obtain the aqueous polyurethane dispersion. 2) Preparation of a fabric coating agent: adding the crosslinking agent, the thickening agent, the flatting agent and the defoaming agent into the waterborne polyurethane prepared in the step 1) to prepare a fabric coating agent. The aqueous polyurethane fabric coating agent prepared by the method has good hand feeling, elasticity and high water pressure resistance, has the characteristic of moisture permeability, is safe and environment-friendly, and can be applied to the field of textiles.)
1. A preparation method of carboxylate type waterborne polyurethane fabric coating agent based on polyester/polyether is characterized by comprising the following steps:
(1) adding polyester diol and polyether diol into a reaction container, heating at 110-130 ℃ and pumping water and drying for 1-2h under the vacuum condition of 0.095-0.1 MPa;
(2) cooling the reaction system in the step (1) to below 60 ℃, adding diisocyanate and a catalyst, and reacting for 0.5-2.5h under the conditions of heating and stirring at 80-90 ℃ to obtain a polyurethane prepolymer;
(3) cooling the reaction system in the step (2) to below 60 ℃, adding an organic solvent which is 1.5-2 times of the mass of the polyurethane prepolymer in the step (2), reducing the viscosity, adding a chain extender A for reaction for 10-30min, adding a carboxylate hydrophilic monomer for reaction for 10-30min, and adding a chain extender B for reaction for 10-30 min;
(4) adding the reaction product obtained in the step (3) into deionized water for dispersing for 20-30min at a high speed, and removing the organic solvent by reduced pressure distillation to obtain a carboxylate type waterborne polyurethane dispersion of polyester/polyether;
(5) and (4) adding the cross-linking agent, the thickening agent, the flatting agent and the defoaming agent into the waterborne polyurethane obtained in the step (4) to prepare a fabric coating agent.
2. The preparation method of the carboxylate type waterborne polyurethane fabric coating agent based on polyester/polyether as claimed in claim 1, wherein the raw materials comprise the following materials by weight:
polyester diol: 16.31 to 81.57 portions
Polyether glycol: 0 to 65.26 portions of
Diisocyanate: 10.80 to 15.04 portions
Organic solvent: 150 portion
Chain extender A: 0 to 3.15 portions of
Carboxylate hydrophilic monomer: 5.15 to 8.59 portions
And (3) chain extender B: 0.20 to 1.33 portions
Catalyst: 0.01 to 0.1 portion
Thickening agent: 1.01-3.98 parts
Leveling agent: 0.08-0.23 part
Defoaming agent: 0.02-0.06 portion
A crosslinking agent: 0.94-1.59 parts.
3. The preparation method of a carboxylate type waterborne polyurethane fabric coating agent based on polyester/polyether as claimed in claim 1, wherein the polyester diol of step (1) comprises one or more of polyethylene glycol adipate diol, polybutylene adipate diol, neopentyl glycol adipate diol, polyhexamethylene glycol adipate diol, polybutylene adipate diol, polyhexamethylene glycol adipate neopentyl glycol adipate diol, polypropylene glycol adipate diol, polycaprolactone diol, polycarbonate diol, polybutylene adipate neopentyl glycol diester diol, and the number average relative molecular weight of the polyester diol is 500-3000.
4. The method for preparing a carboxylate type waterborne polyurethane fabric coating agent based on polyester/polyether as claimed in claim 1, wherein the polyether diol of step (1) comprises one or more of polyethylene glycol, polypropylene glycol and polytetramethylene ether glycol, and the number average relative molecular weight of the polyether diol is 500-3000.
5. The preparation method of carboxylate-type waterborne polyurethane fabric coating agent based on polyester/polyether as claimed in claim 1, wherein the diisocyanate in step (2) comprises one or more of 4,4 '-diphenylmethane diisocyanate, isophorone diisocyanate, toluene diisocyanate, hexamethylene diisocyanate, 4' -dicyclohexylmethane diisocyanate; the catalyst comprises one of dibutyltin dilaurate, stannous octoate and dibutyltin diacetate.
6. The preparation method of carboxylate type waterborne polyurethane fabric coating agent based on polyester/polyether as claimed in claim 1, wherein the organic solvent in step (3) comprises one or more of acetone, butanone, methyl acetate, and toluene; the chain extender A and the chain extender B comprise one or more of ethylenediamine, propylenediamine, butylenediamine, triethylamine, hexamethylenediamine, dimethylolethylamine, tetraethylenepentamine, isophoronediamine, m-phenylenediamine, melamine and hydroxyethyl ethylenediamine.
7. The preparation method of carboxylate type waterborne polyurethane fabric coating agent based on polyester/polyether as claimed in claim 1, wherein the carboxylate hydrophilic monomer in step (3) comprises the following structure:
H2N-R-NH-CH2-CH2COO-A+
wherein R is a straight chain or branched chain of C2-C15 or an aliphatic ring or unsaturated ring of C6-C15, A+Is Na+Or K+Or NH4 +。
8. The preparation method of carboxylate-type waterborne polyurethane fabric coating agent based on polyester/polyether as claimed in claim 1, wherein the solid content of the waterborne polyurethane dispersion obtained in step (4) is 20-60 wt%.
9. The preparation method of carboxylate type waterborne polyurethane fabric coating agent based on polyester/polyether as claimed in claim 1, wherein the cross-linking agent in step (5) is silicone, benzene sulfonic acid, acrylate, isocyanate, aziridine.
10. The carboxylate waterborne polyurethane fabric coating agent based on polyester/polyether prepared by the preparation method of any one of claims 1 to 9.
Technical Field
The invention belongs to the field of polymer chemistry, relates to a coating agent used in the field of textiles, and particularly relates to a carboxylate type waterborne polyurethane fabric coating agent based on polyester/polyether and a preparation method thereof.
Background
Most of the polyurethane coating agents currently on the market in the textile field are solvent-based. In contrast, although the waterborne polyurethane has a difference from solvent-based polyurethane in certain properties, the waterborne polyurethane has the advantages of no toxicity, no combustion, no environmental pollution, energy conservation, safety, good film forming and air permeability and the like. In recent years, the substitution of waterborne polyurethane for solvent-borne polyurethane is an important development direction due to the rising price of organic solvent and the strict limitation of the use of organic solvent and waste discharge by the environmental protection department.
Therefore, the development of waterborne polyurethane which can be used in the textile field is very desirable in the related industry. There are many patents relating to aqueous polyurethane fabric coating agents, and among them, there are many documents on modifying polyurethane, and there are few formulations without modification. The patent with the patent application number of CN 102399348A adopts polybutadiene dihydric alcohol as a raw material, and performs copolymerization modification with butyl acrylate, styrene and hydroxyethyl methacrylate to obtain the polyacrylic acid modified polyurethane aqueous high water pressure resistant coating emulsion for textiles. However, the polyurethane obtained by the method has low solid content and no moisture permeability.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a carboxylate type waterborne polyurethane fabric coating agent based on polyester/polyether, which has the characteristics of good handfeel, elasticity, high water pressure resistance, moisture permeability, safety and environmental protection, and can be applied to the field of textiles. The invention uses polyester/polyether mixture, combines carboxylate type hydrophilic monomer to synthesize water polyurethane, and prepares the fabric coating agent by later stage and auxiliary agents such as aziridine crosslinking agent. The polyester can improve the adhesive force of the product, the polyether can improve the moisture permeability, the polyurethane chain segment is softer, and the carboxylate type hydrophilic monomer can be crosslinked with aziridine at a later stage to improve the comprehensive performance of the product.
The invention also aims to provide a preparation method of the carboxylate type waterborne polyurethane fabric coating agent based on polyester/polyether.
The invention utilizes polyester diol, polyether diol and diisocyanate to react to obtain polyurethane prepolymer; after the viscosity of the prepolymer is reduced by using a solvent, a chain extender A, a carboxylate hydrophilic monomer and a chain extender B are respectively added; adding water for dispersion, and removing the solvent under reduced pressure to obtain an aqueous polyurethane dispersion; the prepared polyurethane is added with a cross-linking agent, a thickening agent, a flatting agent and a defoaming agent to prepare a fabric coating agent.
The purpose of the invention is realized by the following technical scheme:
a preparation method of carboxylate type waterborne polyurethane fabric coating agent based on polyester/polyether comprises the following steps:
(1) adding polyester diol and polyether diol into a reaction container, heating at 110-130 ℃ and pumping water and drying for 1-2h under the vacuum condition of 0.095-0.1 MPa;
(2) cooling the reaction system in the step (1) to below 60 ℃, adding diisocyanate and a catalyst, and reacting for 0.5-2.5h under the conditions of heating and stirring at 80-90 ℃ to obtain a polyurethane prepolymer;
(3) cooling the reaction system in the step (2) to below 60 ℃, adding an organic solvent which is 1.5-2 times of the mass of the polyurethane prepolymer in the step (2), reducing the viscosity, adding a chain extender A for reaction for 10-30min, adding a carboxylate hydrophilic monomer for reaction for 10-30min, and adding a chain extender B for reaction for 10-30 min;
(4) adding the reaction product obtained in the step (3) into deionized water for dispersing for 20-30min at a high speed, and removing the organic solvent by reduced pressure distillation to obtain a carboxylate type waterborne polyurethane dispersion of polyester/polyether;
(5) and (4) adding the cross-linking agent, the thickening agent, the flatting agent and the defoaming agent into the waterborne polyurethane obtained in the step (4) to prepare a fabric coating agent.
Further, the raw materials comprise the following substances in parts by weight:
polyester diol: 16.31 to 81.57 portions
Polyether glycol: 0 to 65.26 portions of
Diisocyanate: 10.80 to 15.04 portions
Organic solvent: 150 portion
Chain extender A: 0 to 3.15 portions of
Carboxylate hydrophilic monomer: 5.15 to 8.59 portions
And (3) chain extender B: 0.20 to 1.33 portions
Catalyst: 0.01 to 0.1 portion
Thickening agent: 1.01-3.98 parts
Leveling agent: 0.08-0.23 part
Defoaming agent: 0.02-0.06 portion
A crosslinking agent: 0.94-1.59 parts.
Further, the polyester diol obtained in the step (1) comprises one or more of polyethylene glycol adipate diol, polybutylene adipate diol, neopentyl glycol adipate diol, polyhexamethylene glycol adipate diol, polyethylene glycol adipate diol, polyhexamethylene glycol adipate neopentyl glycol adipate diol, polypropylene glycol adipate diol, polycaprolactone diol, polycarbonate diol and polybutylene glycol adipate diol, and the number average relative molecular weight of the polyester diol is 500-3000. From the aspects of water resistance and cost, the poly-adipate butanediol neopentyl glycol ester diol with the number average relative molecular weight of 1500-2500 is preferred, wherein the neopentyl glycol has a side chain methyl group, so that intermolecular repulsion can be increased, steric hindrance is generated, the water resistance is improved, long-chain dibasic acid (such as adipic acid) or branched diol (neopentyl glycol) is used as a raw material, the hydrolysis resistance of the polyester can be improved, and meanwhile, the ester group has higher polarity and better adhesive force.
Further, the polyether diol in the step (1) comprises one or more of polyethylene glycol, polypropylene glycol and polytetramethylene ether glycol, and the number average relative molecular weight of the polyether diol is 500-3000. Polytetramethylene ether glycol having number average relative molecular weight of 1500-.
Further, the diisocyanate in the step (2) comprises one or more of 4,4 '-diphenylmethane diisocyanate, isophorone diisocyanate, toluene diisocyanate, hexamethylene diisocyanate and 4,4' -dicyclohexylmethane diisocyanate; preferably, hexamethylene diisocyanate and isophorone diisocyanate are used in combination. Hexamethylene diisocyanate is a linear long-chain molecule with a symmetrical structure, the film forming strength is weak, isophorone diisocyanate has a rigid alicyclic ring, the structure can improve the rigidity of a product and the water resistance, the synthesized polyurethane has strong cohesive force and large film forming strength, and the polyurethane and the isophorone diisocyanate are mixed to increase the irregularity of chain segments, so that the chain segments are softer.
Further, the catalyst in the step (2) comprises one of dibutyltin dilaurate, stannous octoate and dibutyltin diacetate.
Further, the organic solvent in the step (3) comprises one or more of acetone, butanone, methyl acetate and toluene;
further, the chain extender A and the chain extender B in the step (3) comprise one or more of ethylenediamine, propylenediamine, butylenediamine, triethylamine, hexamethylenediamine, dimethylolethylamine, tetraethylenepentamine, isophoronediamine, m-phenylenediamine, melamine and hydroxyethyl ethylenediamine. The chain extender A is preferably isophorone diamine, and due to the cyclic structure, the repulsion between polyurethane chain molecules can be increased, and the water resistance is improved; the chain extender B is preferably hydroxyethyl ethylene diamine, and hydroxyl is introduced to increase moisture permeability.
Further, the carboxylate hydrophilic monomer described in step (3) comprises the following structure:
H2N—R—NH—CH2—CH2COO-A+
wherein R is a straight chain or branched chain of C2-C15 or an aliphatic ring or unsaturated ring of C6-C15, A+Is Na+Or K+Or NH4 +. Preferably R has the structure: -CH2CH2-、Etc. the late carboxylic acid groups can react with the external crosslinker aziridine to improve water pressure resistance.
Further, the solid content of the aqueous polyurethane dispersion obtained in the step (4) is 20-60 wt%. Preferably 30 to 50 wt%, without particular limitation.
Further, the crosslinking agent in the step (5) is organic silicon, benzene sulfonic acid, acrylate, isocyanate and aziridine. Preferably, the aziridine crosslinking agent is easy to react with carboxylic acid groups in the novel carboxylate hydrophilic monomer to generate crosslinking, so that the comprehensive performance of the product, particularly the water pressure resistance, is improved.
The carboxylate waterborne polyurethane fabric coating agent based on polyester/polyether prepared by the preparation method of any one of the above. Has the characteristics of good hand feeling, elasticity, high water pressure resistance and moisture permeability.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention uses polyester/polyether mixture, combines carboxylate type hydrophilic monomer to synthesize water-borne polyurethane, and prepares the fabric coating agent with auxiliary agents such as aziridine crosslinking agent and the like at the later stage to improve the comprehensive performance of products, especially the water pressure resistance.
2. The preparation method provided by the invention has the advantages of simple and efficient synthesis, safe and environment-friendly whole system which is an aqueous system, no toxicity and basically no emission of Volatile Organic Compounds (VOC).
Detailed Description
The following further illustrates embodiments of the invention, but the examples are not intended to be limiting thereof.
The application method of the fabric coating agent comprises the following steps: the coating agent is uniformly coated on 380T nylon yarn by a coating device for dry coating, then dried at 70-80 ℃ for about 4min until being dried, and then dried at 130-140 ℃ for about 2 min.
The water pressure resistance test of the invention: the determination was carried out according to the method of GB/T4744-2013, using a hydrostatic tester for fabrics manufactured by TEXTEST, Switzerland. Applying continuously rising pressure to the clamped fabric at the rate of 60mbar/min by adopting a pressurization method under the standard atmospheric pressure until three water drops seep out of the other side of the fabric, and recording the pressure at the moment, namely the water pressure resistance of the fabric.
Moisture permeability test of the present invention: the measurement was carried out according to the positive cup method in GB/T12704.2-2009, using a moisture permeability tester manufactured by Suzhou, Inc., a Mofu apparatus. Under the condition that the environmental temperature of the test box is 38 soil 2 ℃ and the relative humidity is 50 soil 2%, distilled water of 38 soil 2 ℃ is sealed by a moisture permeable cup of a fabric sample and is placed in the test box, and the moisture permeability is calculated according to the mass after the test for 1h and the mass change after the humidity in the box is adjusted for 1 h.
The preparation of the carboxylate hydrophilic monomer is obtained by referring to a preparation method in insulating type aqueous polyurethane dispersoid preparation and performance research.
Example 1
16.31g of polytetramethylene glycol neopentyl glycol adipate 2000 and 65.26g of polytetramethylene ether glycol 2000 were put into a 500ml three-necked round-bottomed flask equipped with an electric stirrer, a condenser and a thermometer and dehydrated under vacuum at 130 ℃ under 0.01MPa for 2 hours. And (3) cooling to 60 ℃, adding 5.48g of hexamethylene diisocyanate, 7.25g of isophorone diisocyanate and 0.01g of dibutyltin dilaurate catalyst, heating to 80 ℃, reacting for 45min, and titrating the residual amount of-NCO by a di-n-butylamine method until the content of-NCO reaches 2.18 wt%. The temperature is reduced to 60 ℃, and 150g of acetone is added for dissolution. The temperature of the system was controlled at 35 ℃ and 1.28g of isophorone diamine, 2.405g of N- (2-aminoethyl) -alanine triethylamine salt, and 0.12g of hydroxyethyl ethylenediamine were added in this order and reacted for 20 min. Slowly adding 100g of deionized water at the rotating speed of 800r/min, and stirring for 30min to obtain the white blue-emitting light dispersoid. And finally, under the vacuum condition of 55 ℃ and 0.07MPa, decompressing and removing the acetone solvent to obtain the waterborne polyurethane dispersion PUD1 with the solid content of 51.50%. The PUD1 is added with 1.09g of aziridine crosslinking agent, 2.56g of thickening agent, 0.13g of leveling agent and 0.04g of defoaming agent to prepare the aqueous polyurethane fabric coating agent.
Example 2
32.63g of polytetramethylene glycol neopentyl glycol adipate diol 2000 and 48.94g of polytetramethylene ether glycol 2000 were put into a 500ml three-necked round-bottomed flask equipped with an electric stirrer, a condenser and a thermometer, and dehydrated under vacuum at 130 ℃ under 0.01MPa for 2 hours. The temperature is reduced to 60 ℃, 5.48g of hexamethylene diisocyanate, 7.25g of isophorone diisocyanate and 0.01g of dibutyltin dilaurate catalyst are added, the temperature is increased to 80 ℃, the reaction is carried out for 55min, and the residual amount of-NCO is titrated by a di-n-butylamine method until the content of-NCO reaches 2.18 wt%. The temperature is reduced to 60 ℃, and 150g of acetone is added for dissolution. The temperature of the system was controlled at 35 ℃ and 1.28g of isophorone diamine, 2.405g of N- (2-aminoethyl) -alanine triethylamine salt, and 0.15g of hydroxyethyl ethylenediamine were added in this order and reacted for 20 min. Slowly adding 100g of deionized water at the rotating speed of 800r/min, and stirring for 30min to obtain the white blue-emitting light dispersoid. And finally, under the vacuum condition of 55 ℃ and 0.07MPa, decompressing and removing the acetone solvent to obtain the aqueous polyurethane dispersion PUD2 with the solid content of 49.17 percent. The PUD2 is added with 1.09g of aziridine crosslinking agent, 2.56g of thickening agent, 0.13g of leveling agent and 0.04g of defoaming agent to prepare the aqueous polyurethane fabric coating agent.
Example 3
A500 ml three-necked round-bottomed flask equipped with an electric stirrer, a condenser and a thermometer was charged with 48.94g of polytetramethylene glycol adipate neopentyl glycol 2000 and 32.63g of polytetramethylene ether glycol 2000, and vacuum dehydrated at 130 ℃ under 0.01MPa for 2 hours. And (3) cooling to 60 ℃, adding 5.48g of hexamethylene diisocyanate, 7.25g of isophorone diisocyanate and 0.01g of dibutyltin dilaurate catalyst, heating to 80 ℃, reacting for 1h, and titrating the residual amount of-NCO by a di-n-butylamine method until the content of-NCO reaches 2.18 wt%. The temperature is reduced to 60 ℃, and 150g of acetone is added for dissolution. The temperature of the system was controlled at 35 ℃ and 1.28g of isophorone diamine, 2.405g of N- (2-aminoethyl) -alanine triethylamine salt, and 0.31g of hydroxyethyl ethylenediamine were added in this order and reacted for 20 min. Slowly adding 100g of deionized water at the rotating speed of 800r/min, and stirring for 30min to obtain the white blue-emitting light dispersoid. And finally, under the vacuum condition of 55 ℃ and 0.07MPa, decompressing and removing the acetone solvent to obtain the aqueous polyurethane dispersion PUD3 with the solid content of 50.33%. The PUD3 is added with 1.09g of aziridine crosslinking agent, 2.56g of thickening agent, 0.13g of leveling agent and 0.04g of defoaming agent to prepare the aqueous polyurethane fabric coating agent.
Example 4
49.06g of polytetramethylene glycol neopentyl glycol adipate glycol 2000 and 32.71g of polytetramethylene ether glycol 2000 were put into a 500ml three-necked round-bottomed flask equipped with an electric stirrer, a condenser and a thermometer, and dehydrated under vacuum at 130 ℃ under 0.01MPa for 2 hours. The temperature is reduced to 60 ℃, 5.50g of hexamethylene diisocyanate, 7.27g of isophorone diisocyanate and 0.01g of dibutyltin dilaurate catalyst are added, the temperature is increased to 80 ℃, the reaction is carried out for 1h, and the residual amount of-NCO is titrated by a di-n-butylamine method until the content of-NCO reaches 2.18 wt%. The temperature is reduced to 60 ℃, and 150g of acetone is added for dissolution. The temperature of the system is controlled to be 35 ℃, 1.29g of isophorone diamine, 2.06g of N- (2-aminoethyl) -alanine triethylamine salt and 0.34g of hydroxyethyl ethylene diamine are added in turn to react for 20min respectively. Slowly adding 100g of deionized water at the rotating speed of 800r/min, and stirring for 30min to obtain the white blue-emitting light dispersoid. And finally, under the vacuum condition of 55 ℃ and 0.07MPa, decompressing and removing the acetone solvent to obtain the aqueous polyurethane dispersion PUD4 with the solid content of 50.17%. The PUD4 is added with 0.94g of aziridine crosslinking agent, 2.42g of thickening agent, 0.10g of leveling agent and 0.04g of defoaming agent to prepare the aqueous polyurethane fabric coating agent.
Example 5
48.82g of polytetramethylene glycol neopentyl glycol adipate diol 2000 and 32.55g of polytetramethylene ether glycol 2000 were put into a 500ml three-necked round-bottomed flask equipped with an electric stirrer, a condenser and a thermometer, and dehydrated under vacuum at 130 ℃ under 0.01MPa for 2 hours. The temperature is reduced to 60 ℃, 5.47g of hexamethylene diisocyanate, 7.23g of isophorone diisocyanate and 0.01g of dibutyltin dilaurate catalyst are added, the temperature is increased to 80 ℃, the reaction is carried out for 1h, and the residual amount of-NCO is titrated by a di-n-butylamine method until the content of-NCO reaches 2.18 wt%. The temperature is reduced to 60 ℃, and 150g of acetone is added for dissolution. The temperature of the system is controlled to be 35 ℃, 1.28g of isophorone diamine, 2.75g of N- (2-aminoethyl) -alanine triethylamine salt and 0.056g of hydroxyethyl ethylene diamine are added in turn to react for 20min respectively. Slowly adding 100g of deionized water at the rotating speed of 800r/min, and stirring for 30min to obtain the white blue-emitting light dispersoid. And finally, under the vacuum condition of 55 ℃ and 0.07MPa, decompressing and removing the acetone solvent to obtain the aqueous polyurethane dispersion PUD5 with the solid content of 52.50 percent. The PUD5 is added with 1.25g of aziridine crosslinking agent, 2.79g of thickening agent, 0.16g of flatting agent and 0.05g of defoaming agent to prepare the aqueous polyurethane fabric coating agent.
The water pressure resistance and moisture permeability of the aqueous polyurethane fabric coating agent prepared in the above steps are tested, and the results are shown in the following table 1:
TABLE 1
As can be seen from the test results in Table 1, compared with untreated fabrics, the novel carboxylate type waterborne polyurethane fabric coating agent based on polyester/polyether is softer and more elastic in hand feeling, the water pressure resistance is obviously improved, and meanwhile, the novel carboxylate type waterborne polyurethane fabric coating agent has certain moisture permeability, belongs to a solvent-free product, has no influence on the environment, is simple in process, and can be used in the field of textiles.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any equivalent alterations, modifications or improvements made by those skilled in the art to the above-described embodiments using the technical solutions of the present invention are still within the scope of the technical solutions of the present invention.