Preparation method of high cross-linking ultraviolet cured waterborne polyurethane

A technology of water-based polyurethane and ultraviolet light, which is applied in the field of coatings, can solve the problems of poor product performance and low UV curing reaction efficiency, and achieve the effects of excellent chemical resistance and mechanical properties, high molecular weight, and high crosslinking density

Inactive Publication Date: 2017-12-01
安徽思敬齐环保材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention proposes a method for preparing highly cross-linked UV-curable water-based polyurethane, which solves the pr

Method used

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  • Preparation method of high cross-linking ultraviolet cured waterborne polyurethane
  • Preparation method of high cross-linking ultraviolet cured waterborne polyurethane
  • Preparation method of high cross-linking ultraviolet cured waterborne polyurethane

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Embodiment 1

[0030] The preparation method of a highly cross-linked UV-curable waterborne polyurethane of the present embodiment comprises the following steps:

[0031] (1) 50 parts by weight of polyoxypropylene glycol, containing 35 parts by weight of double bond polyisocyanate and 55 parts by weight of toluene diisocyanate were reacted at 90-100 ° C for 3 hours;

[0032] (2) Add 20 parts by weight of 1,2-propanediol, 8 parts by weight of dimethylolpropionic acid, 30 parts by weight of acetone and 0.3 parts by weight of stannous octoate, and react at 60-80° C. for 6 hours;

[0033] (3) Add 100 parts by weight of acetone and 8 parts by weight of sodium ethylenediamine sulfonate, and react at 50-60°C for 0.5 hours;

[0034] (4) Add 80 parts by weight of acetone, add 8 parts by weight of triethylamine under high-speed shearing, add 450 parts by weight of water after stirring for 3 minutes, high-speed dispersion and emulsification for 3 minutes, and then add 8 parts by weight of isophorone di...

Embodiment 2

[0043] The preparation method of a highly cross-linked UV-curable waterborne polyurethane of the present embodiment comprises the following steps:

[0044] (1) 30 parts by weight of polyoxypropylene glycol, containing 50 parts by weight of double bond polyisocyanate and 10 parts by weight of toluene diisocyanate were reacted at 90-100 ° C for 4 hours;

[0045] (2) Add 5 parts by weight of 1,2-propanediol, 15 parts by weight of dimethylolpropionic acid, 10 parts by weight of acetone and 0.5 parts by weight of stannous octoate, and react at 60-80° C. for 4 hours;

[0046] (3) Add 50 parts by weight of acetone and 12 parts by weight of sodium ethylenediamine sulfonate, and react at 50-60°C for 0.5 hours;

[0047] (4) Add 50 parts by weight of acetone, add 12 parts by weight of triethylamine under high-speed shearing, add 600 parts by weight of water after stirring for 1 minute, high-speed dispersion and emulsification for 2 minutes, and then add 25 parts by weight of isophorone d...

Embodiment 3

[0056] The preparation method of a highly cross-linked UV-curable waterborne polyurethane of the present embodiment comprises the following steps:

[0057] (1) 80 parts by weight of polyoxypropylene glycol, containing 20 parts by weight of double bond polyisocyanate and 100 parts by weight of toluene diisocyanate were reacted at 90-100 ° C for 2 hours;

[0058] (2) Add 40 parts by weight of 1,2-propanediol, 3 parts by weight of dimethylol propionic acid, 50 parts by weight of acetone and 0.1 part by weight of stannous octoate, and react at 60-80° C. for 7 hours;

[0059] (3) Add 150 parts by weight of acetone and 5 parts by weight of sodium ethylenediamine sulfonate, and react at 50-60° C. for 1 hour;

[0060] (4) Add 100 parts by weight of acetone, add 2.5 parts by weight of triethylamine under high-speed shearing, add 300 parts by weight of water after stirring for 5 minutes, high-speed dispersion and emulsification for 5 minutes, and then add 15 parts by weight of isophoron...

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Abstract

The invention discloses a preparation method of high cross-linking ultraviolet cured waterborne polyurethane. The method comprises the following steps of performing a reaction between macromolecular dihydric alcohol, polyisocyanate with double bond and diisocyanate for 2-4h at the temperature of 90-100 DEG C; adding a micromolecular chain extender, a hydrophilic chain-extending agent I, solvent and a catalyst to react for 4-7h at the temperature of 60-80 DEG C; adding solvent and a hydrophilic chain-extending agent II to react for 0.5-1h at the temperature of 50-60 DEG C; adding solvent, and adding a salt-forming agent under high-speed cutting, adding water after stirring for 1-5min and adding a post chain-extending agent which is diluted by 3-5 times of water after dispersing and emulsifying for 2-5min at high speed, stirring for 20-40min, and then desorbing the solvent under vacuum to acquire the waterborne polyurethane. The high cross-linking ultraviolet cured waterborne polyurethane which is solidified by UV has high cross-linking density and molecular weight, and excellent chemical resistance and mechanical performance.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a preparation method of highly cross-linked ultraviolet-curable waterborne polyurethane. Background technique [0002] People's awareness of environmental protection is getting higher and higher, and the policy guides the further development of water-based materials. However, the disadvantages such as poor chemical resistance and insufficient mechanical properties due to the water-borne process limit the further application of water-borne materials. High cross-linking is one of the ways to improve the comprehensive performance of water-based materials, and UV curing has been recognized by people. However, in the current technology, the double bond groups for UV curing are at the end of the polymer chain. Due to the end effect, the reaction efficiency is not high, and the introduction of double bonds at the end prevents the further increase of the molecular weight of the polymer...

Claims

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Application Information

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IPC IPC(8): C08G18/10C08G18/12C08G18/42C08G18/44C08G18/48C08G18/66C08G18/76C08G18/81C08G18/32C08G18/38C08G18/34C08G18/75C09D175/04C09D175/06C09D175/08
Inventor 陶灿戎佳萌徐杰王继印贾娟潘轸
Owner 安徽思敬齐环保材料有限公司
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