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
CN107417872AInactive Publication Date: 2017-12-01安徽思敬齐环保材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
安徽思敬齐环保材料有限公司
Publication Date
2017-12-01
Estimated Expiration
Not applicable · inactive patent

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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