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Two-component water-based hydroxyl acrylic polyurethane finishing coating emulsion and preparation method thereof

A technology of hydroxyacrylic polyurethane and hydroxyacrylate, which is applied in the field of two-component waterborne hydroxyacrylic polyurethane topcoat emulsion and its preparation, to achieve the effects of improving water resistance, simple preparation process and long potency period

Active Publication Date: 2021-08-27
SHANGHAI BAOLIJIA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the invention is to solve the existing problems of how to improve the glossiness of water-based finish paint emulsion and reduce production cost

Method used

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  • Two-component water-based hydroxyl acrylic polyurethane finishing coating emulsion and preparation method thereof

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Embodiment 1

[0031] This embodiment provides a technical solution: a two-component waterborne hydroxyacrylic polyurethane topcoat emulsion and its preparation method, its formula includes 1-2% emulsifier, 45-50% water, 7-12% hydroxyacrylate mono body, 10-20% styrene, 20-28% acrylate monomer, 0.3-1.5% vinyl siloxane, 0.1-1% chain transfer agent and 0.1-1% initiator; the emulsifier includes anionic Emulsifier and nonionic emulsifier, the chain transfer agent includes one or more of mercaptoethanol, mercaptopropanol, and 2-hydroxyethyl mercaptopropionate.

[0032] The hydroxyacrylic acid monomer and the vinyl siloxane are used as functional monomers to improve the water resistance and hardness of the emulsion finished product. During the reaction process, the hydroxyl groups in the hydroxyacrylic acid monomers tend to accumulate or aggregate, resulting in uneven distribution of the hydroxyl groups in the finished emulsion, resulting in a decrease in the hardness of the finished emulsion; ther...

Embodiment 2

[0041] The present embodiment provides a kind of production technology of a kind of two-component waterborne hydroxyacrylic polyurethane topcoat emulsion described in the preparation embodiment 1, and the steps are as follows:

[0042] S1. To prepare the pre-emulsion, take 20-70% of the total amount of emulsifier and 20-60% of the total amount of water and stir and mix it for 10-20 minutes to completely dissolve it, and then add all the styrene and acrylic esters in sequence body, hydroxy acrylate monomer, vinyl siloxane, chain transfer agent, and emulsified at high speed for 30-40 minutes to prepare a pre-emulsion for later use;

[0043] First, by mixing part of the emulsifier and water, a part of the emulsifier aqueous solution is prepared, and at the same time, all the monomers and chain transfer agents are added to the part of the emulsifier aqueous solution for agitation reaction, so that the emulsification reaction is initially started, using part of the emulsifier and wa...

Embodiment 3

[0054] This embodiment provides a technical solution:

[0055] a) To prepare the pre-emulsion, weigh 310g of deionized water, 12g of anionic reactive emulsifier SR10 (Japan Adidas), 10g of isomeric tridecyl alcohol polyoxyethylene ether nonionic emulsifier NOVELUTION 390 (Sasol Functional Chemicals ) stirred rapidly for 15 minutes to dissolve completely, added 120g styrene, 150g methyl methacrylate, 50g butyl methacrylate, 148g ethyl acrylate, 114g butyl acrylate, 93 isooctyl acrylate, 180g hydroxymethacrylate Ethyl ester, 15g of acrylic acid, 10g of mercaptoethanol, and 10g of vinyltrimethoxysilane were stirred at high speed for 30 minutes to obtain a pre-emulsion.

[0056] b) Prepare the bottom material of the kettle, weigh 360g deionized water, 6g reactive emulsifier SR10 (Japan Aidike), 10g NOVELUTION 390 (Sasol functional chemicals), 20.95g sodium bicarbonate aqueous solution (dissolve 0.95g in 20g water sodium bicarbonate solid) was stirred for 15 minutes. heat up.

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Abstract

The invention relates to the technical field of finishing coating emulsions for engineering machinery, in particular to a two-component water-based hydroxyl acrylic polyurethane finishing coating emulsion and a preparation method of the two-component water-based hydroxyl acrylic polyurethane finishing coating emulsion. The formula comprises the following components in percentage by weight: 1%-2% of an emulsifier, 45%-50% of water, 7%-12% of a hydroxyl acrylate monomer, 10%-20% of styrene, 20%-28% of an acrylate monomer, 0.3%-1.5% of vinyl siloxane, 0.1%-1% of a chain transfer agent and 0.1%-1% of an initiator. According to the invention, the water resistance, fullness and high gloss of the water-based hydroxyl acrylic polyurethane finish coating can be effectively improved, and a plurality of metal substrates have very strong adhesive force; and a reactive anionic emulsifier is selected to be matched with a nonionic emulsifier combination, styrene, an acrylate monomer, a molecular weight regulator and other auxiliaries are polymerized by adopting a seed emulsion and a semi-continuous dropwise addition method, the preparation process is simple, the product is green and environment-friendly, the product does not contain APEO, the VOC content is low, and the activation period of the two-component coating is long.

Description

technical field [0001] The invention belongs to the technical field of engineering machinery finish paint emulsion, and specifically relates to a two-component water-based hydroxyl acrylic polyurethane finish paint emulsion and a preparation method thereof. Background technique [0002] There are many types of exterior decorative finishes for construction machinery, such as alkyd topcoats, one-component acrylic topcoats, and two-component acrylic polyurethane topcoats, and two-component acrylic polyurethane topcoats are currently more mainstream products. The weather resistance of alkyd topcoat is average, and the protection time is short. Problems such as loss of light and discoloration will occur in about 3 months, and it needs to be refurbished and maintained in about 3 years, and the matching paint is prone to bottoming. The one-component acrylic topcoat has poor antirust performance, low fullness of the paint film, and low solid content, which cannot meet high-demand co...

Claims

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Application Information

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IPC IPC(8): C09D175/04C08F220/20C08F212/08C08F220/14C08F220/18C08F220/06C08F230/08C08F2/26C08F2/30
CPCC09D175/04C08F220/20C08F2/26C08F2/30C08F212/08C08F220/14C08F220/1804C08F220/1802C08F220/1808C08F220/06C08F230/085C08F2500/26Y02A50/20
Inventor 李秋琼房迎春
Owner SHANGHAI BAOLIJIA NEW MATERIAL CO LTD
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