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A kind of low-temperature wet pressure change polyurethane resin for environment-friendly leather and preparation method thereof

A polyurethane resin and environment-friendly technology, which is applied to the low-temperature wet pressure-transformation polyurethane resin for environment-friendly leather and its preparation field, can solve the problems of changes in the physical properties of the polyurethane resin, high pressure-transformation temperature, and many organic solvents, and achieves the pressure-transformation temperature. Low, stable discoloration, low effect of organic solvents

Active Publication Date: 2018-04-24
嘉兴企远网信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: after processing, there are many residual organic solvents (about 300ppm); the pressure change temperature is high, which needs to be above 190°C; the color after pressure change is uneven, and the high temperature pressure change is easy to cause changes in the physical properties of polyurethane resin, and even carbonization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The invention provides an environment-friendly low-temperature wet pressure change polyurethane resin for leather and a preparation method thereof, comprising the following steps:

[0027] 1) Put 0.48 kg of polybutylene adipate polyol, 0.1 kg of polycaprolactone polyol and 0.6 kg of dimethylformamide into a glass reactor, raise the temperature to 60°C, and stir for 30 minutes;

[0028] 2) Put 0.05 kg of diphenylmethane diisocyanate into the reactor, raise the temperature to 80°C and react for 2.5 hours to make a prepolymer;

[0029] 3) Put 0.86 kg of dimethylformamide, 0.03 kg of ethylene glycol, and 0.053 kg of 1.4-butanediol into the reactor, keep the temperature at 80°C, and stir for 20 minutes;

[0030] 4) Put 0.27 kg of diphenylmethane diisocyanate into the reactor three times for viscosity-increasing reaction, check the viscosity, and if the viscosity is unqualified, continue to add a small amount of diphenylmethane diisocyanate for viscosity-increasing reaction u...

Embodiment 2

[0034] The invention provides an environment-friendly low-temperature wet pressure change polyurethane resin for leather and a preparation method thereof, comprising the following steps:

[0035] 1) Put 0.6 kg of polybutylene adipate polyol, 0.25 kg of polycaprolactone polyol and 1.05 kg of dimethylformamide into a glass reactor, raise the temperature to 60°C, and stir for 30 minutes;

[0036] 2) Put 0.05 kg of diphenylmethane diisocyanate into the reactor, raise the temperature to 80°C and react for 2.5 hours to make a prepolymer;

[0037] 3) Put 1.4 kg of dimethylformamide, 0.04 kg of ethylene glycol, and 0.15 kg of 1.4-butanediol into the reactor, keep the temperature at 80°C, and stir for 20 minutes;

[0038] 4) Put 0.336 kg of diphenylmethane diisocyanate into the reactor three times for viscosification reaction, check the viscosity, if the viscosity is unqualified, continue to add a small amount of diphenylmethane diisocyanate for viscosification reaction until the visco...

Embodiment 3

[0042] The invention provides an environment-friendly low-temperature wet pressure change polyurethane resin for leather and a preparation method thereof, comprising the following steps:

[0043] 1) Put 0.64 kg of polybutylene adipate polyol, 0.12 kg of polycaprolactone polyol and 0.84 kg of dimethylformamide into a glass reactor, raise the temperature to 60°C, and stir for 30 minutes;

[0044] 2) Put 0.06 kg of diphenylmethane diisocyanate into the reactor, raise the temperature to 80°C and react for 2.5 hours to make a prepolymer;

[0045] 3) Put 1.12 kg of dimethylformamide, 0.04 kg of ethylene glycol, and 0.12 kg of 1.4-butanediol into the reactor, keep the temperature at 80°C, and stir for 20 minutes;

[0046] 4) Put 0.3 kg of diphenylmethane diisocyanate into the reaction kettle for viscosity increasing reaction three times, check the viscosity, if the viscosity is unqualified, continue to add a small amount of diphenylmethane diisocyanate, carry out viscosity increasing...

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PUM

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Abstract

The invention provides environment-friendly low-temperature wet stamping-discoloring polyurethane resin and a preparation method for the same. The polyurethane resin is processed from the following components in parts by mass: 8 to 10 parts of diphenylmethane diisocyanate, 12 to 16 parts of polybutylene adipate polyol, 3 to 5 parts of polycaprolactone, 0.8 to 1 part of ethylene glycol, 1 to 3 parts of 1.4-butylene glycol, 0.2 to 0.4 part of a stamping-discoloring auxiliary, 0.01 to 0.03 part of hydroxymethyl modified silicone oil and 68 to 70 parts of dimethylformamide. The preparation method is simple in process and high in operability, and the obtained low-temperature wet stamping-discoloring polyurethane resin has the advantages of good low-temperature stamping-discolorinig effects, low stamping-discoloring temperature, uniform color, stable discoloring, low organic solvent residual rate and the like.

Description

technical field [0001] The invention relates to the technical field of chemical product manufacturing, in particular to an environment-friendly low-temperature wet pressure-change polyurethane resin for leather and a preparation method thereof. Background technique [0002] Traditional polyurethane resin is widely used in leather making, such as artificial leather, synthetic leather, and two-handed leather. Generally, there are two processing methods, namely dry method and wet method. The dry method means that the polyurethane resin is directly coated on the release paper (also known as release paper), dried in an oven and then bonded to the substrate; the wet method refers to the polyurethane resin is directly coated on the substrate ( Substrates include non-woven fabrics, cotton cloth, nylon cloth, Erlang leather, etc.) put into the water tank to solidify, wash out the solvent with water, and then dry in an oven. Compared with the finished product made by the dry method, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/42C08G18/32C08G18/12D06N3/14
CPCC08G18/12C08G18/3206C08G18/4202C08G18/4238C08G18/4277C08G18/664C08G18/7657D06N3/14
Inventor 郭孟姣周维求赖剑强谭中华何旭明
Owner 嘉兴企远网信息科技有限公司