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Preparation method of hydroxy acrylic resin for recoatable polyurethane coating

A technology of hydroxyacrylic and polyurethane coatings, which is applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems that do not involve resin synthesis, etc., and achieve the effects of good chemical resistance, wide use, and excellent weather resistance

Active Publication Date: 2014-04-09
SHANGHAI HUAYI FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Domestic patents CN1778849 and CN101921537 are only about the preparation of coatings, and do not involve the synthesis of resin

Method used

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  • Preparation method of hydroxy acrylic resin for recoatable polyurethane coating
  • Preparation method of hydroxy acrylic resin for recoatable polyurethane coating
  • Preparation method of hydroxy acrylic resin for recoatable polyurethane coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 770g of glycidyl tert-carbonate, 4g of trinonylphenyl phosphite, and 0.5g of stannous octoate into the reactor, heat it to 90°C, keep it warm for 30 minutes, raise the temperature to 105-110°C, and start adding 227g of acrylic acid dropwise. 0.1g of p-hydroxyanisole mixture, control the dropping rate uniformly, and drop it in about 1 hour. After dripping, keep warm for 2 to 3 hours, and measure the acid value. If the acid value is higher than 5 mgKOH / g, the temperature is raised to 120° C. until the acid value is lower than 5 mgKOH / g, then the reaction is terminated to obtain the product monomer ACE.

Embodiment 2

[0039]Add 200g of xylene into the reactor, blow nitrogen, stir and raise the temperature to 126-132°C, start to drop 17.5g of butyl acrylate, 31.2g of methyl methacrylate, and 10.5g of the monomer ACE prepared in Example 1 , a mixture of 0.4g acrylic acid and 0.4g tert-butyl peroxybenzoate, control the dropping speed evenly, finish dropping the mixture in about 40 minutes, and start adding 87.7g butyl acrylate and 156g methyl methacrylate dropwise immediately after dropping , 37.6g hydroxyethyl acrylate, the mixture of monomer ACE, 2g acrylic acid and 2g tert-butyl peroxybenzoate prepared in 53.5g embodiment 1, dropwise at a constant speed, dropwise in 3 hours, after insulation for 1 hour , add 1.2g tert-butyl peroxybenzoate, continue to keep warm for 2-3 hours, cool down to 80°C, add 200g xylene to dilute, stir and disperse to obtain colorless and transparent hydroxyacrylic resin. The parameter index of embodiment 1 sees the following table:

[0040] Table 1

[0041] ...

Embodiment 3

[0043] Add 200g of xylene into the reactor, blow nitrogen, stir and raise the temperature to 126-132°C, start to add dropwise 18g of butyl acrylate, 30g of methyl methacrylate, 10.5g of the monomer ACE prepared in Example 1, 0.4 The mixture of 1g acrylic acid and 0.4g tert-butyl peroxybenzoate, control the dropping rate uniformly, drop the mixture in about 40 minutes, start to drop 90g butyl acrylate, 150g methyl methacrylate, 42g acrylic acid immediately after dropping Hydroxypropyl ester, the monomer ACE that 53.5g embodiment 1 makes, the mixture of 2g acrylic acid and 2g tert-butyl peroxybenzoate, add dropwise at a constant speed, finish dripping in 3 hours, after keeping warm for 1 hour, add 1.2 g tert-butyl peroxybenzoate, continue to keep warm for 2 to 3 hours, cool down to 80°C, add 200g xylene to dilute, stir and disperse to obtain a colorless and transparent hydroxyacrylic resin. The parameter index of embodiment 2 sees the following table:

[0044] Table 2

[0045]...

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Abstract

The invention discloses a preparation method of hydroxy acrylic resin for a recoatable polyurethane coating. According to the method, hydroxy acrylic resin is copolymerized by adopting a two-step segmentation method, and a monomer angiotensin converting enzyme (ACE) with internal plasticization is led to a polymer chain segment. The hydroxy acrylic resin is used as a base stock of the coating, cured and crosslinked with polyisocyanate. The prepared recoatable polyurethane coating has excellent weather fastness and corrosion resistance, good chemical resistance and excellent mechanical property. The coating is greatly applied to heavy-duty coating as the finishing coat.

Description

1. Technical field [0001] The invention relates to a method for synthesizing an acrylic resin, in particular to a method for preparing a special hydroxyl-containing acrylic resin, which is cured with polyisocyanate and used to prepare recoatable polyurethane coatings. 2. Background technology [0002] As we all know, aliphatic polyurethane coatings are favored by customers for their excellent weather resistance, corrosion resistance, good chemical resistance and excellent mechanical properties. Before the film is completely dry, apply the second coat of paint to make the two layers of coating film tightly bonded. Otherwise, if the curing time of the bottom layer is too long, the paint film is too hard, and it is easy to peel off and peel off between the two layers. The surface of the long-cured paint film must be roughened with sandpaper before the second coat of paint can be applied. If the paint film is partially damaged and needs to be repaired, the area around the area ...

Claims

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Application Information

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IPC IPC(8): C08F220/14C08F220/18C08F220/28C08F216/02C08F218/12C08F220/06C08G18/62C09D175/04
Inventor 章奕
Owner SHANGHAI HUAYI FINE CHEM CO LTD
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