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Colored polyurethane resin for synthetic leather and preparation method thereof

A technology of polyurethane resin and synthetic leather, which is applied in textiles and papermaking, and can solve the problems of easy migration of dyes, insufficient color, and transparency

Active Publication Date: 2015-06-10
ZHEJIANG SUNLIGHT MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the shortage of traditional synthetic leather coloring materials. One purpose of the present invention is to propose a colored polyurethane resin for synthetic leather. It also solves the problem that the color of synthetic leather is not bright enough and transparent due to pigment coloring

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Dehydrate 180 parts of polybutylene adipate diol (molecular weight: 2000) in vacuum for about 1 hour, and lower the temperature to 50°C; add 450 parts of DMF, 18 parts of diphenylmethane diisocyanate, and dibutyltin dilaurate to the reaction kettle 0.5 parts, stir evenly, heat up to 80°C, react for 2 hours; add 41.5 parts of diphenylmethane diisocyanate and 55 parts of disperse red 19, continue to react for 2 hours at 80°C; then add 150 parts of toluene, slowly use about 5 parts of diisocyanate Phenylmethane diisocyanate is used to increase the viscosity. When the viscosity rises to 100000cps / 25℃, add 100 parts of methyl ethyl ketone, continue to stir for 1h, then cool to 30℃, and discharge; obtain a red polyurethane resin with a solid content of 30% and a viscosity of 80000cps .

Embodiment 2

[0042] Vacuum dehydrate 232 parts of polytetrahydrofuran diol (molecular weight: 2000) for about 1 hour, and lower the temperature to 50°C; add 400 parts of DMF, 19 parts of ethylene glycol, 50 parts of toluene diisocyanate, and 1 part of stannous octoate into the reaction kettle, and stir evenly , heat up to 80°C, react for 2h; add 40 parts of toluene diisocyanate and 48 parts of disperse violet 1#, continue to react for 2h at 80°C; then add 100 parts of toluene, 100 parts of ethyl acetate, slowly use about 10 parts of toluene diisocyanate Viscosification with isocyanate, when the viscosity rises to 20000cps / 25°C, stop the viscosity increase, continue stirring for 1 hour, then cool to 30°C, and discharge; obtain a purple polyurethane resin with a solid content of 40% and a viscosity of 50,000cps.

Embodiment 3

[0044] Dehydrate 85 parts of polyoxypropylene glycol (molecular weight: 2000) in vacuum for about 1 hour, and lower the temperature to 50°C; add 500 parts of DMF, 21 parts of neopentyl glycol, 35 parts of isophorone diisocyanate, and stannous octoate into the reaction kettle 1 part, stir evenly, heat up to 80°C, react for 3 hours; add 100 parts of toluene, 200 parts of butyl acetate, 35 parts of isophorone diisocyanate and 23 parts of disperse blue 79#, continue to react for 4 hours at 80°C, wait until the viscosity After reaching the predetermined value, continue to react for 1 hour, then cool to 30°C, and discharge; obtain a blue polyurethane resin with a solid content of 20% and a viscosity of 10,000 cps.

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Abstract

The invention relates to the technical field of materials for a synthetic leather, and specifically relates to a colored polyurethane resin for the synthetic leather and a preparation method thereof. Provided is the colored polyurethane resin for the synthetic leather; the colored polyurethane resin is obtained by mainly preparing the raw materials as follows: a macromolecular polyhydric alcohol, a dye, a micromolecular polyhydric alcohol chain extender, diisocyanate, an accessory ingredient and a solvent. The dye is a dye containing di-hydroxyl or double primary amino groups. The colored polyurethane resin for the synthetic leather can be used for a polyurethane synthetic leather layer or a post-processing. Due to the fact that the dye molecules react on a polyurethane main chain, a phenomenon of color-transfer cannot happen, thereby solving the problem that the dye is easy to transfer after dyeing by a common polyurethane resin, and further solving the problem that the color is not bright and thorough enough caused by coloring the synthetic leather with pigments.

Description

technical field [0001] The invention relates to the technical field of materials for synthetic leather, in particular to colored polyurethane resin for synthetic leather and a preparation method thereof. Background technique [0002] In terms of coloring of synthetic leather materials, the main use is to directly add pigment products or dye products to polyurethane resin for synthetic leather, and mix the pigment products or dye products with polyurethane resin after stirring to achieve the purpose of polyurethane resin coloring. Since the pigments or dyes used to color polyurethane are only mixed and colored, the color fixation is only a physical process without chemical bonding, and the pigments or dyes are in a free state in the resin, so it is easy to cause many problems such as color migration. The dye is basically dissolved in the resin system in a molecular state. A single dye in a small molecule state is easy to migrate, but the dye is bright and transparent. The st...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/48C08G18/44C08G18/32D06N3/14
CPCC08G18/32C08G18/4238C08G18/44C08G18/4825C08G18/4854C08G18/6633C08G18/664C08G18/6674D06N3/146D06N3/147D06N2211/28
Inventor 戴文琪陈曦郦向宇成波
Owner ZHEJIANG SUNLIGHT MATERIAL TECH CO LTD
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