Water-dispersible modified polyisocyanates
A technology of polyisocyanate and isocyanate, which is applied in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, adhesive types, etc., can solve the problems of increasing the VOC content of coatings, reducing the yellowing resistance of coatings, the environment and the human body. Harm and other problems, to achieve the effect of low VOC content, good transparency, high gloss transparency
Pending Publication Date: 2022-04-12
COVESTRO DEUTSCHLAND AG
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CN101754990A discloses the method of using 4-aminotoluene-2-sulfonic acid containing benzene ring to modify polyisocyanate, and the water dispersibility of polyisocyanate modified by sulfonic acid group is better than that of polyisocyanate modified by carboxylic acid group. Isocyanate, but the benzene ring present in it reduces the yellowing resistance of the coating formed by it
The addition of solvents will significantly increase the VOC content of the paint, causing harm to the environment and human body
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[0225] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. When the definitions of terms in this specification conflict with the meanings generally understood by those skilled in the art to which the present invention belongs, the definitions stated herein shall prevail.
[0226] Unless otherwise indicated, all numbers expressing amounts of ingredients, reaction conditions, etc. used in the specification and claims are understood to be modified by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth herein are approximations that can vary as required to obtain the desired properties.
[0227] As used in this specification, "a", "an", "an" and "the" are intended to include "at least one" or "one or more" unless stated otherwise. For example, "a component" means one or more components, thus more tha...
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Abstract
The invention relates to water-dispersible modified polyisocyanate and application thereof, in particular to application of the water-dispersible modified polyisocyanate as a crosslinking component of a water-soluble or water-dispersible coating. The water-dispersible modified polyisocyanate can be obtained by reacting a system comprising the following components: a water-dispersible polyisocyanate and an isocyanate reactive component; the viscosity of the water-dispersible modified polyisocyanate is 3000 mPa.s to 11000 mPa.s, and the viscosity is measured according to DIN EN ISO 3219: 1994-10 at the temperature of 23 DEG C and the shear rate of 10 s <-1 > by selecting an MV-DIN rotor. The water-dispersible modified polyisocyanate disclosed by the invention has good manual stirring property and good dispersity, and a coating layer formed by a coating containing the water-dispersible modified polyisocyanate has high gloss and good transparency.
Description
technical field [0001] The present invention relates to a water-dispersible modified polyisocyanate and its application, especially as a crosslinking component of water-soluble or water-dispersible paint. Background technique [0002] In response to increasingly stringent environmental regulations in various countries, water-dispersible modified polyisocyanates have become more and more important in various application fields in recent years. Water-dispersible modified polyisocyanates are often used as crosslinking components in water-based two-component coatings or water-based adhesives and sealants. Water-dispersible modified polyisocyanates are used to crosslink aqueous dispersions in textile finishing or formaldehyde-free textile printing inks, and additionally as auxiliary agents for wet strengthening of paper (see for example EP-A0959087 and the documents cited therein ). [0003] At present, water-dispersible modified polyisocyanates can be roughly divided into two ...
Claims
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Inventor 刘好马亚光徐娜夏添H·约瑟夫拉斯R·皮雷K·丹尼尔梅耶尔
Owner COVESTRO DEUTSCHLAND AG