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Novel method for preparing WPU synthetic leather foaming layer based on Pickering foam template method

A foam template and synthetic leather technology, applied in textiles and papermaking, etc., to achieve strong stability, improve mechanical properties, and simple operation

Active Publication Date: 2021-04-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to literature research, there are no literature and patent reports about the preparation of water-based polyurethane synthetic leather foam layer by this method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]Weigh 20.00 g of polytetrahydrofuran ether (M n=2000) into the reactor, add isophorone diisocyanate (IPDI) and 300ml of acetone into the reactor, stir mechanically under the protection of nitrogen, and react at 70°C for 1 hour. Add 2.68g of 2,2-dimethylolpropionic acid, 1.8g of 1,4-butanediol and 1 drop of catalyst, and stir the catalytic reaction at 80°C for 4h. Add neutralizer, temperature is 40°C, stirring speed is 2000rpm, neutralize for 1h, adjust pH value to 9. The reaction product was removed by rotary evaporation to remove acetone, and concentrated to a solid content of 70% to 80%. Add high-purity deionized water to the reactant, stir and emulsify at high speed for 0.5h at a stirring speed of 8000rpm, stir at a low speed for 1h at a speed of 3000rpm, concentrate by rotary evaporation, and obtain soft water-based polyurethane for synthetic leather with a solid content of 20%.

[0027] Take by weighing 100 g of the synthetic leather soft water-based polyurethane w...

Embodiment 2

[0029] Weigh 20.00 g of polytetrahydrofuran ether (M n=2000) into the reactor, add isophorone diisocyanate (IPDI) and 200ml of acetone into the reactor, stir mechanically under the protection of nitrogen, and react at 70°C for 1 hour. Add 2.68g of 2,2-dimethylolpropionic acid, 1.8g of 1,4-butanediol and 1 drop of catalyst, and stir the catalytic reaction at 80°C for 4h. Add neutralizer, temperature is 40°C, stirring speed is 2000rpm, neutralize for 1h, adjust pH value to 9. The reaction product was removed by rotary evaporation to remove acetone, and concentrated to a solid content of 70% to 80%. Add high-purity deionized water to the reactant, stir and emulsify at high speed for 0.5h at a stirring speed of 8000rpm, stir at a low speed for 1h at a speed of 3000rpm, concentrate by rotary evaporation, and obtain soft water-based polyurethane for synthetic leather with a solid content of 30%.

[0030] Take by weighing 100g of soft water-based polyurethane with a solid content of...

Embodiment 3

[0032] Weigh 20.00 g of hydroxyl-terminated polysiloxane (M n=2000) into the reactor, add isophorone diisocyanate (IPDI) and 200ml of acetone into the reactor, stir mechanically under nitrogen protection, and react at 70°C 1h. Add 2.68g of 2,2-dimethylolpropionic acid, 1.8g of 1,4-butanediol and 1 drop of catalyst, and stir the catalytic reaction at 80°C for 4h. Add neutralizer, temperature is 40°C, stirring speed is 2000rpm, neutralize for 1h, adjust pH value to 9. The reaction product was removed by rotary evaporation to remove acetone, and concentrated to a solid content of 70% to 80%. Add high-purity deionized water to the reactant, stir and emulsify at high speed for 0.5h at a stirring speed of 8000rpm, stir at a low speed for 1h at a speed of 3000rpm, concentrate by rotary evaporation, and obtain soft water-based polyurethane for synthetic leather with a solid content of 30%.

[0033] Take by weighing 100g of soft water-based polyurethane with a solid content of 40%, a...

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PUM

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Abstract

The invention discloses a novel method for preparing a WPU synthetic leather foaming layer based on a Pickering foam template method. The method is characterized by comprising the following steps: adding a water-based cross-linking agent and a Pickering water-based foam stabilizer, namely hydrophobic inorganic solid particles, into soft water-based polyurethane serving as a raw material, and emulsifying at a high speed to obtain Pickering water-based foam slurry containing polyurethane latex particles; and drying to obtain the waterborne polyurethane foaming layer. According to the invention, the waterborne polyurethane foaming layer is prepared by adopting a Pickering water-based foam template method, no organic solvent is used in the preparation process, and the processing technology is clean, environment-friendly, simple to operate and easier to realize industrial production; and the Pickering foam has very strong interface stability, so that the problem that the pore diameter is difficult to regulate and control due to the aggregation and collapse of bubbles in the drying process of a mechanical foaming method is effectively solved, and the prepared synthetic leather foaming layer has good hygienic property.

Description

technical field [0001] The invention belongs to the field of water-based synthetic leather manufacture, and in particular relates to a new method for preparing a foamed layer of WPU synthetic leather based on a Pickering foam template method. Background technique [0002] With the development of the economy and the improvement of people's living standards, the demand for leather products is increasing; however, natural leather cannot meet the growing demand of people due to the limited source of raw materials. In addition, the production process of leather will cause serious pollution to the environment. In order to solve these problems, scientists have begun to research and develop alternative materials for natural leather, and have successively developed artificial leather and synthetic leather. Synthetic leather is a composite product that simulates the structure and performance of natural leather. It is usually made of polyurethane resin as the coating material. The base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L75/08C08L75/04C08L25/06C08K3/36C08K3/34C08G18/10C08G18/48C08G18/61C08G18/65C08G18/66C08G18/34C08G18/32C08G101/00
CPCC08G18/10C08G18/6692C08G18/4854C08G18/6541C08G18/61C08J9/28C08J9/0066C08J9/0014C08G2101/00C08J2375/08C08J2375/04C08G18/348C08G18/3206C08G18/755C08G18/12C08G18/6674C08G18/3819C08G2110/0083C08G18/0852D06N3/0043D06N3/146D06N3/147D06N2205/04C08G18/14C08G18/6607C08J9/286D06N3/148
Inventor 王春华林炜魏涛盛一峰吴尖辉
Owner SICHUAN UNIV
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