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Waterborne polyurethane synthetic leather preparation method

A water-based polyurethane and synthetic leather technology, applied in textiles and papermaking, can solve the problems of low solid content and unfavorable film formation, achieve low viscosity, shorten film formation and drying time, and reduce exhaust emissions

Active Publication Date: 2019-10-01
福建中裕新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is found in the research that the solid content of the existing technology is low, which is unfavorable for film formation

Method used

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  • Waterborne polyurethane synthetic leather preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: a kind of preparation method of waterborne polyurethane synthetic leather comprises the following steps:

[0031] (1) Under nitrogen protection, mix 70 parts by mass of isophorone diisocyanate, 20 parts by mass of polytetrahydrofuran diol and 0.35 parts by mass of dibutyltin dilaurate, and react at 80°C for 2 hours; add 1, 8 parts by mass of 4-butanediol sodium sulfonate, continue to react at 80°C for 3hr; cool down to 55°C, add 4 parts by mass of nicotinamide, and react for 2hr; cool down to 30°C, add 1.5 parts by mass of triethanolamine, Reaction 0.6hr; Add 1.5 parts by mass of sodium acetate and 1.5 parts by mass of acetic acid to obtain water-based polyurethane;

[0032] (2) Mix 5 parts by mass of the foaming coagulant, 5 parts by mass of calcium carbonate, and 100 parts by mass of the water-based polyurethane prepared in step (1), first foam through a foaming machine with an air flow rate of 3L / min, and then Foam evenly in the dispersant at 1000r / min...

Embodiment 2

[0037] Embodiment 2: a kind of preparation method of waterborne polyurethane synthetic leather comprises the following steps:

[0038] (1) Under the protection of nitrogen, mix 68 parts by mass of isophorone diisocyanate, 19 parts by mass of polytetrahydrofuran diol and 0.2 parts by mass of dibutyltin dilaurate, and react at 79°C for 3 hours; add 1, 7 parts by mass of 4-butanediol sodium sulfonate, continue to react at 79°C for 4hr; cool down to 54°C, add 3 parts by mass of nicotinamide, and react for 3hr; cool down to 25°C, add 1 part by mass of triethanolamine, Reaction 1hr; Add 1 mass part of sodium acetate and 1 mass part of acetic acid to obtain water-based polyurethane;

[0039] (2) Mix 4 parts by mass of the foaming coagulant, 4 parts by mass of calcium carbonate, and 100 parts by mass of the water-based polyurethane prepared in step (1), first foam through a foaming machine with an air flow rate of 2L / min, and then Foam evenly in the dispersant at 800r / min rotating sp...

Embodiment 3

[0044] Embodiment 3: a kind of preparation method of waterborne polyurethane synthetic leather comprises the following steps:

[0045] (1) Under the protection of nitrogen, mix 72 parts by mass of isophorone diisocyanate, 21 parts by mass of polytetrahydrofuran diol and 0.5 parts by mass of dibutyltin dilaurate, heat up to 82°C and react for 3 hours; add 1, 9 parts by mass of 4-butanediol sodium sulfonate, continue to react at 82°C for 2hr; cool down to 56°C, add 5 parts by mass of nicotinamide, and react for 1hr; cool down to 35°C, add 2 parts by mass of triethanolamine, Reaction 0.5hr; Add 2 parts by mass of sodium acetate and 2 parts by mass of acetic acid to obtain water-based polyurethane;

[0046] (2) Mix 6 parts by mass of the foaming coagulant, 6 parts by mass of calcium carbonate, and 100 parts by mass of the water-based polyurethane prepared in step (1), first foam through a foaming machine with an air flow rate of 4L / min, and then Foam evenly in the dispersant at a...

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Abstract

The invention discloses a waterborne polyurethane synthetic leather preparation method. The preparation method includes steps: (1) mixing isophorone diisocyanate, polytetrahydrofuran and dibutyltin dilaurate, performing reaction, adding 1,4-butanediol sodium sulfonate to realize reaction, adding nicotinamide to realize reaction, and adding triethanolamine to realize reaction to obtain waterborne polyurethane; (2) mixing a foaming flocculant, calcium carbonate and waterborne polyurethane, foaming, and performing foam homogenizing to obtain waterborne polyurethane foamed slurry; (3) mixing water, a thickening agent, an external cross-linking agent and waterborne polyurethane, and uniformly dispersing to obtain adhesive slurry; (4) applying waterborne polyurethane to release paper, and drying; coating a surface layer with the waterborne polyurethane foamed slurry, and drying; coating a foamed layer with the adhesive slurry, adhering an adhesive layer to base cloth, and drying. Temperaturecontrol, quantity control and time control in a reaction process are realized, and the method has advantages of solid content increase and system viscosity reduction.

Description

technical field [0001] The invention relates to a preparation method of water-based polyurethane synthetic leather. Background technique [0002] Synthetic leather is a composite material that simulates the structure and performance of natural leather and can be used as a substitute for natural leather. Usually, the non-woven fabric impregnated with high molecular polymer is used to simulate the mesh layer, and the microporous polyurethane layer is used to simulate the grain layer. Close to natural leather, it is widely used to make shoes, boots, bags and ball games. [0003] At present, the production of synthetic leather basically adopts a solvent-based production system. The solvent-based polyurethane coating agent used in the process contains a large amount of toxic organic solvents, such as DMF (dimethylformamide), TOL (toluene), MEK (methyl ethyl ketone) ) and THF (tetrahydrofuran), etc. During the manufacturing process, it seriously pollutes the environment and pos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06N3/14D06N3/00C08G18/75C08G18/66C08G18/48C08G18/38
CPCC08G18/3855C08G18/4854C08G18/6666C08G18/755D06N3/0011D06N3/0063D06N3/0097D06N3/14
Inventor 向宇黄娇陈漾
Owner 福建中裕新材料技术有限公司
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