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 th

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
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Example Embodiment

[0036] Example 1:

[0037] 770g of glycidyl tertiary carbonate, 4g of trinonylphenyl phosphite, and 0.5g of stannous octoate were added to the reactor, heated to 90°C, kept warm for 30 minutes, warmed to 105~110°C, and started to drip 227g of acrylic acid, The mixture of 0.1g of p-hydroxyanisole, the dripping speed is controlled to be uniform, and the dripping is completed 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, the reaction is terminated, and the product monomer ACE is obtained.

Example Embodiment

[0038] Example 2:

[0039]200g of xylene was added to the reactor, nitrogen was passed through, the temperature was raised to 126-132°C with stirring, and 17.5g of butyl acrylate, 31.2g of methyl methacrylate, and 10.5g of the monomer ACE prepared in Example 1 were added dropwise. , the mixture of 0.4g acrylic acid and 0.4g tert-butyl peroxybenzoate, control the dripping speed to be uniform, the mixture was dripped in about 40 minutes, and 87.7g of butyl acrylate and 156g of methyl methacrylate were added dropwise immediately after dripping. , 37.6g of hydroxyethyl acrylate, 53.5g of the mixture of monomer ACE prepared in Example 1, 2g of acrylic acid and 2g of tert-butyl peroxybenzoate, dripped at a uniform speed, dripped within 3 hours, and kept warm for 1 hour. , add 1.2 g of tert-butyl peroxybenzoate, continue to keep the temperature for 2 to 3 hours, cool down to 80 ° C, add 200 g of xylene for dilution, stir and disperse to obtain a colorless and transparent hydroxy acry...

Example Embodiment

[0042] Example 3:

[0043] 200g of xylene was added to the reactor, nitrogen was passed through, the temperature was raised to 126-132°C with stirring, and 18g of butyl acrylate, 30g of methyl methacrylate, 10.5g of the monomers ACE prepared in Example 1, 0.4 The mixture of g acrylic acid and 0.4g tert-butyl peroxybenzoate was controlled to be evenly added, and the mixture was dripped in about 40 minutes. Immediately after dripping, 90g of butyl acrylate, 150g of methyl methacrylate and 42g of acrylic acid were added dropwise. The mixture of hydroxypropyl ester, 53.5g of monomer ACE prepared in Example 1, 2g of acrylic acid and 2g of tert-butyl peroxybenzoate was added dropwise at a constant speed, and dropped within 3 hours. g tert-butyl peroxybenzoate, continue to keep the temperature for 2 to 3 hours, lower the temperature to 80° C., add 200 g of xylene for dilution, stir and disperse to obtain a colorless and transparent hydroxy acrylic resin. The parameter index of embod...

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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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