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A kind of non-voc chitosan modified waterborne silicone polyurethane-polyacrylate nano-hybrid coating and preparation method thereof

A polyacrylate and chitosan modification technology, which is applied in the field of nano-hybrid coatings and their preparation, can solve problems such as hardness needs to be improved, achieve good decoration and protection, increase hydrogen bond content, and have good hand feeling effects

Active Publication Date: 2016-08-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Multiple methods for preparing PU / PA composite emulsion have been reported at present, such as: (1) blending crosslinking method; (2) core-shell emulsion polymerization; (3) interpenetrating polymer network method, etc., but its latex film The appearance, water resistance, stain resistance, especially the hardness still need to be improved

Method used

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  • A kind of non-voc chitosan modified waterborne silicone polyurethane-polyacrylate nano-hybrid coating and preparation method thereof
  • A kind of non-voc chitosan modified waterborne silicone polyurethane-polyacrylate nano-hybrid coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A preparation method of a VOC-free chitosan-modified waterborne silicone polyurethane-polyacrylate nano-hybrid coating, comprising the following steps:

[0040] a. First, in parts by mass, add 30 parts of inert vinyl monomer, 15 parts of polymer polyol, 0.6 part of water-soluble chitosan, 20 parts of diisocyanate compound, 5 parts of anionic mixed hydrophilic Water chain extender and 0.1 part of catalyst, the reaction temperature is 70°C, and the reaction time is 2 hours;

[0041] b. Then, add 5 parts of hydrophilic vinyl monomers containing hydroxyl or amino groups for capping, then add 5 parts of silicone coupling agents containing alkoxy groups, react for 0.5 hours, and then cool the system temperature to 30°C , then add 5.7 parts of alkali salt-forming agent, neutralize and react for 20 minutes, then add 85 parts of water, stir and disperse for 10 minutes, and then raise the temperature to 75°C;

[0042] c. Then, under the condition that the temperature is 75°C, th...

Embodiment 2

[0047] A preparation method of a VOC-free chitosan-modified waterborne silicone polyurethane-polyacrylate nano-hybrid coating, comprising the following steps:

[0048] a. First, in parts by mass, add 32 parts of inert vinyl monomers, 20 parts of polymer polyols, 1.5 parts of water-soluble chitosan, 22 parts of diisocyanate compounds, 7 parts of anionic mixed hydrophilic Water chain extender and 0.2 parts of catalyst, the reaction temperature is 75°C, and the reaction time is 2.5 hours;

[0049] b. Next, add 6 parts of hydrophilic vinyl monomers containing hydroxyl or amino groups for capping, then add 5.5 parts of silicone coupling agents containing alkoxy groups, react for 0.6 hours, and then cool the system temperature to 35°C , then add 6 parts of alkali salt-forming agent, neutralize and react for 25 minutes, then add 150 parts of water, stir and disperse for 15 minutes, and then raise the temperature to 75°C;

[0050] c. Then, under the condition that the temperature is ...

Embodiment 3

[0055] A preparation method of a VOC-free chitosan-modified waterborne silicone polyurethane-polyacrylate nano-hybrid coating, comprising the following steps:

[0056] a. First, in parts by mass, add 34 parts of inert vinyl monomers, 25 parts of polymer polyols, 2.5 parts of water-soluble chitosan, 24 parts of diisocyanate compounds, 8 parts of anionic mixed hydrophilic Water chain extender and 0.25 parts of catalyst, the reaction temperature is 80°C, and the reaction time is 3 hours;

[0057] b. Next, add 6 parts of hydrophilic vinyl monomers containing hydroxyl or amino groups for capping, then add 5.5 parts of silicone coupling agents containing alkoxy groups, react for 0.8 hours, and then cool the system temperature to 40°C , then add 6 parts of alkali salt-forming agent, neutralize and react for 30 minutes, then add 200 parts of water, stir and disperse for 20 minutes, and then heat up to 80°C;

[0058] c. Then, under the condition that the temperature is 80°C, the aqueo...

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Abstract

The invention discloses a modified water-based organic silicon polyurethane-polyacrylate nano hybrid waterborne coating free from VOC (volatile organic compound) chitosan modification and a preparation method of the coating The waterborne coating is prepared by the following steps: by taking an inert vinyl monomer mixture as a continuous phase, polymerizing polymer polyol, an anionic mixing hydrophilic chain extender, water soluble chitosan and a diisocyanate compound, reacting with a hydrophilic vinyl monomer containing hydroxy or amino, neutralizing through an alkali salt forming agent and dispersing in water to obtain a polyurethane micro-emulsion, and further initiating polymerization of vinyl monomers. By introducing an organic silicon coupling agent, hydroxy of the water soluble chitosan reacts with an isocyanate group, and such functional groups as amino and carboxyl react with a polyurethane prepolymer, so as to form a hybrid network, thus improving hydrogen bond content and increasing a cross-linking degree, and further enhancing water resistance, solvent resistance and mechanical properties. The coating disclosed by the invention has such characteristics as being non-toxic, safe, high in adhesive force, high in hardness, wear-resistant, good in fullness and good in hand feeling; moreover, product preparation process is simple and production cost is relatively low.

Description

technical field [0001] The invention relates to a nano-hybrid coating and a preparation method thereof, in particular to a VOC-free chitosan-modified water-based organosilicon polyurethane-polyacrylate nano-hybrid coating and a preparation method thereof. Background technique [0002] Polyurethane is mainly a copolymer formed by the gradual polymerization of polyol and polyisocyanate. Its molecular chain is usually composed of soft segments and hard segments alternately. The soft segment is generally composed of polyols (polyether, polyester, etc.), while isocyanate and Small molecule chain extenders (diamines or diols) constitute the hard segment. Polyurethane can improve its performance by adjusting the structure, length and distribution of soft and hard segments on the polyurethane molecular chain, as well as adjusting the relative proportion of soft and hard segments, changing the molecular weight and crosslinking degree. [0003] Polyurethane (PU) has good physical and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D151/08C08F290/06C08F220/18C08F220/14C08G18/12C08G18/64C08G18/30C08J3/24
Inventor 王海花范洁费贵强沈一丁兰静
Owner SHAANXI UNIV OF SCI & TECH
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