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A kind of self-foamable aqueous polyurethane resin emulsion and preparation method thereof

A water-based polyurethane and resin emulsion technology, applied in the field of water-based polyurethane, can solve the problems of complicated production process, precipitation of finished synthetic leather, affecting product quality, etc., and achieve the effect of simplifying the feeding process, improving production efficiency and ensuring product quality.

Active Publication Date: 2022-04-19
WANHUA CHEM GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the water-based polyurethane resin used in the factory cannot foam and stabilize foam by itself, which has limited the development of synthetic leather to a certain extent.
[0004] Patent CN 106947048 A discloses a water-based polyurethane resin used to prepare water-based garment leather bases. The bases obtained through this resin are soft to the touch and high in fullness, but foaming agents and foam stabilizers need to be added to the production formula of the bases For foaming and foam stabilization, the production process is cumbersome. At the same time, most of the foaming agents and foam stabilizers are surfactants with small molecular weights. There is a risk of precipitation in the finished synthetic leather, which will eventually affect the quality of the product.

Method used

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  • A kind of self-foamable aqueous polyurethane resin emulsion and preparation method thereof
  • A kind of self-foamable aqueous polyurethane resin emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Dehydrate 100g of polytetrahydrofuran ether polyol (molecular weight: 2000) at 105°C for 1h, then cool down to 50°C, add 60g of dicyclohexylmethane diisocyanate, raise the temperature to 90°C and keep it warm for 3 hours, measure the NCO content, and reach the theoretical After the value is 9.40%, cool down to 50°C, then add 6g of dimethylolpropionic acid, 6g of ethylene glycol, and 9g of polyether-modified siloxane to react at 80°C for 2 hours, cool down to 50°C, and then add 0.2g of organic bismuth Coscat83 and 10ml acetone to adjust the viscosity, react at 70°C for 2.5h, then cool down to 0°C, add 4.3g of triethylamine for neutralization, after neutralization for 10min, add 367.5g of deionized water under high-speed shear at 1500rpm, and disperse After 7 minutes, 1.48 g of ethylenediamine was slowly added to react for 10 minutes. The final NCO value was 1.15%. The acetone and part of the water in the system were distilled off under reduced pressure to obtain an aqueou...

Embodiment 2

[0057]Dehydrate 50g of polytetrahydrofuran ether polyol (molecular weight: 1500) and 50g polypropylene oxide polyol (molecular weight: 2500) at 110°C for 1h, then cool down to 50°C, add 65g of isophorone diisocyanate, and heat up Heat the reaction at 90°C for 3 hours, measure the NCO content, and cool down to 50°C after reaching the theoretical value of 12.17%, then add 4g of dimethylol propionic acid, 10g of ethylene glycol, and 8g of polyether modified siloxane at 80°C React for 2 hours, cool down to 50°C, then add 0.2g of organic bismuth Coscat83 and 8ml of acetone to adjust the viscosity, react at 70°C for 2.5h, then cool down to 0°C, add 1.13g of sodium hydroxide for neutralization, after 10 minutes of neutralization , add 379.7g of deionized water under high-speed shear at 1500rpm, disperse for 5min, then slowly add 3.82g of hexamethylenediamine, react for 20min, the final NCO value is 1.49%, remove the acetone and part of the water in the system by distillation under red...

Embodiment 3

[0059] Dehydrate 85g of polypropylene oxide polyol (molecular weight: 2000) at 100°C for 2h, then cool down to 50°C, add 50g of dicyclohexylmethane diisocyanate, raise the temperature to 85°C and keep it warm for 3.5 hours to measure the NCO content. Cool down to 50°C after the theoretical value is 9.23%, then add 2.5g dimethylol butyric acid, 7g 1,4-butanediol, 1g 2,2,3,3,3-pentafluoro-1-propanol at 80 React at ℃ for 2 hours, cool down to 50℃, then add 0.25g organic bismuth Coscat83 and 4ml acetone to adjust the viscosity, react at 75℃ for 2h, then cool down to 0℃, add 1.79g of triethylamine for neutralization, and neutralize for 10min Finally, add 299.8g of deionized water under high-speed shear at 1500rpm, disperse for 10min, then slowly add 2.19g of ethylenediamine, react for 15min, the final NCO value is 1.985%, and remove acetone and part of the water in the system by distillation under reduced pressure, namely An aqueous polyurethane resin emulsion 3 with a solid conten...

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Abstract

The invention provides a self-foaming aqueous polyurethane resin emulsion and a preparation method thereof. The water-based polyurethane resin emulsion includes the following raw materials: polyol, polyisocyanate, hydrophilic chain extender, small molecule alcohol chain extender, organic silicon or fluorine-containing compound containing active hydrogen, amine chain extender, catalyst, and salt-forming agent. The present invention introduces a nonionic surfactant containing silicon or fluorine into the molecular chain, so that the water-based polyurethane resin can self-foam under the action of high shear force, simplifies the production process of synthetic leather, and greatly reduces the production cost. The production efficiency is effectively improved, and the situation that the external foaming agent and foam stabilizer are easy to separate out is avoided at the same time.

Description

technical field [0001] The invention relates to the field of water-based polyurethane, in particular to a self-foaming water-based polyurethane resin emulsion and a preparation method thereof. Background technique [0002] Synthetic leather is a kind of material with a feel and performance close to natural leather. Its main components are base fabric, foam layer, bonding layer and surface layer. Among them, the foam layer can bring fullness to the synthetic leather, and at the same time, it can bring different performances to the synthetic leather according to the adjustment of the foaming ratio, which is an indispensable part of the synthetic leather. [0003] The foam layer of synthetic leather is also called bass layer, and its preparation process mainly includes dry process and wet process. Although the dry process is very different from the wet process, the performance requirements of the resin itself are also different. However, the slurry needs to be foamed to a cer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/10C08G18/34C08G18/32C08J9/00
CPCC08G18/4854C08G18/758C08G18/755C08G18/48C08G18/10C08J9/00C08J2375/08C08G18/6692C08G18/3228C08G18/348C08G18/3206C08G18/3804
Inventor 孙小鹏邢庆达王海梅赵炳炎王鹏杨建强张树翔刘有杰
Owner WANHUA CHEM GRP CO LTD
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