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Polyurea type anti-settling agent

An anti-settling agent and polyurea technology, used in two-component polyurethane coatings, one-component high-temperature baking coatings and one-component thermoplastic coatings, can solve the problem of non-aqueous dispersion resin thixotropic effect is not outstanding, chemical resistance Unsatisfactory performance, affecting gloss and vividness, etc., to achieve good thixotropy and anti-settling effect, obvious thixotropy effect and high viscosity

Active Publication Date: 2015-04-08
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many kinds of anti-settling agents commonly used, but there are some defects in the use process, such as: organic bentonite, its chemical resistance is not ideal and affects the gloss, so it cannot be used for top coating; Under the action, azobenzene will be formed, which is easy to yellow and has poor weather resistance; polyamide wax is easy to form azo compounds, which is easy to yellow and affects gloss, so it cannot be used for top coating; polyethylene wax affects gloss, and the addition amount is large. The thixotropic effect is not ideal and cannot be used for top coating; the thixotropic effect of non-aqueous dispersion resin is not outstanding, and its basic function is not for thixotropy, but to increase the molecular weight to improve the physical, mechanical and chemical resistance of the coating; Fumed silica affects gloss and cannot be used for top coating; general rheology-modified resin microemulsion can only be used in amino baking varnish, because its polyurea particles react with amino at high temperature to form a transparent paint film, while When used in polyurethane system or air-drying thermoplastic acrylic system, since polyurea particles cannot participate in the reaction, the microemulsion of the paint film formed will affect its gloss and distinct image

Method used

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  • Polyurea type anti-settling agent
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  • Polyurea type anti-settling agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1 prepares the hydroxyl acrylic resin of Mn2000

[0017] In the 500ml four-necked reaction flask equipped with stirrer, thermometer, dropping funnel and condenser, add S100# solvent 200g (equivalent to 40wt%), under nitrogen protection, start stirring, be warming up to reflux (about 165 ℃ ), began to drop the mixed liquid 300g (comprising the monomer and the initiator) of the monomer and the peroxide initiator dropwise at a constant speed, wherein the monomer was 9.5g of hydroxyethyl methacrylate and 100g of methyl methacrylate, methyl Butyl acrylate 60g, butyl acrylate 40g, styrene 30g and vinyl tertiary carbonate 40g add up to 279.5g (equivalent to monomer total amount 55.9wt%, wherein, hydroxy acrylate monomer is: hydroxyethyl methacrylate accounts for unit 3.4wt% of the total volume, specifically calculated as 9.5÷279.5=3.4wt%); the initiator is 20.5g of di-tertamyl peroxide (equivalent to 4.1wt%), and solution polymerization is carried out at 160-170°C f...

Embodiment 2

[0018] Embodiment 2 prepares the hydroxyl acrylic resin of Mn3000

[0019] In a 500ml four-necked reaction flask equipped with stirrer, thermometer, dropping funnel and condenser, add xylene solvent 200g (equivalent to 40wt%), under nitrogen protection, start stirring, be warming up to reflux (about 138 ℃ ), began to drip the mixed solution 300g (including monomer and initiator) of monomer and peroxide initiator at a constant speed, wherein the monomer was 5.5g of hydroxyethyl acrylate and 100g of methyl methacrylate, butyl methacrylate Ester 80g, butyl acrylate 58g and styrene 40g add up to 283.5g (corresponding to monomer total amount 56.7wt%, wherein, hydroxy acrylate monomer is: hydroxyethyl acrylate accounts for 1.94wt% of monomer total amount); The agent is 16.5g (equivalent to 3.3wt%) of tert-butyl peroxybenzoate (equivalent to 3.3wt%) for solution polymerization at 135-140°C, and the dropwise addition is completed in about 6 hours, and then kept for 3 hours, cooled and...

Embodiment 3

[0020] Embodiment 3 prepares the hydroxyl acrylic resin of Mn4000

[0021]In the 500ml four-necked reaction flask that stirrer, thermometer, dropping funnel and condenser are equipped with, add butyl acetate solvent 225g (corresponding to 45wt%), under nitrogen protection, start stirring, be warming up to reflux (about 128 ℃), began to drop at a constant speed a mixture of 275g of monomers and peroxide initiators (including monomers and initiators), wherein the monomers were 4.5g of hydroxypropyl acrylate and 80g of methyl methacrylate, methacrylic acid 80g of butyl ester, 65g of butyl acrylate and 30g of styrene totaled 259.5g (equivalent to 51.9wt% of the total amount of monomers, wherein the hydroxyacrylate monomer is: hydroxypropyl acrylate accounts for 1.73wt% of the total amount of monomers); The initiator is tert-butyl peroxybenzoate 15.5g (equivalent to 3.1wt%), and solution polymerization is carried out at 125-130°C, and the dropwise addition is completed in about 5 h...

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Abstract

The invention relates to a polyurea type anti-settling agent. A preparation method of the polyurea type anti-settling agent comprises the following steps: reacting hydroxyl acrylic resin and a diisocyanate compound solution at the temperature of 40-60 DEG C for 1-3 hours, cooling to the temperature of 0-40 DEG C, reacting with an amine compound solution for 1-2 hours, cooling and discharging to obtain polyurea grafted acrylic resin, wherein the solid content is 45-55wt%, and the urea bond content is 3.0-4.5wt%; and grafting the polyurea structure to a side chain of a hydroxyl acrylic resin molecule, wherein the various raw materials comprise the following components: 70-90wt% of hydroxyl acrylic resin, 5-15wt% of diisocyanate compound solution and 5-15wt% of amine compound solution. The anti-settling agent is transparent liquid, has the thixotropic behavior, is good in anti-settling effect and convenient to charge and can be used for single-component high-temperature baking coatings, two-component polyurethane coatings and single-component thermoplastic coatings, and the glossiness and distinctness of the coating are not influenced.

Description

technical field [0001] The invention relates to a polyurea type anti-settling agent, which is especially suitable for two-component polyurethane coatings, one-component high-temperature baking coatings and one-component thermoplastic coatings. Background technique [0002] The phenomenon of sedimentation is often encountered during the production and use of paints. Therefore, it is sometimes necessary to add anti-sedimentation agents during the preparation of paints, that is, to introduce loose network thixotropic structures into paints, which can make pigments and filler particles suspend without agglomeration. Prevent pigment settling, improve coating performance and maintain excellent leveling. There are many kinds of anti-settling agents commonly used, but there are some defects in the use process, such as: organic bentonite, its chemical resistance is not ideal and affects the gloss, so it cannot be used for top coating; Under the action, azobenzene will be formed, whi...

Claims

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Application Information

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IPC IPC(8): C09D7/02C08G18/62C09D7/45
CPCC08G18/3228C08G18/6229C08G18/6529C09D7/45C09D175/04
Inventor 陈斌张玉兴王木立苟小青
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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