Preparation method of water dispersed modified acrylic ester resin for automobile finish varnish

An acrylate, dispersion-based technology, applied in the direction of coating etc.

Active Publication Date: 2010-11-10
GUANGDONG YATU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the research on enhancing the durability of water-based acrylic paint cured paint film, such as water resistance, alkali resistance, acid resistance, salt spray resistance and UV aging resistance.

Method used

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  • Preparation method of water dispersed modified acrylic ester resin for automobile finish varnish
  • Preparation method of water dispersed modified acrylic ester resin for automobile finish varnish
  • Preparation method of water dispersed modified acrylic ester resin for automobile finish varnish

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preparation example Construction

[0022] The preparation method of water dispersion type modified acrylate coating resin of the present invention, comprises the steps:

[0023] Dissolving part of the initiator in the vinyl monomer;

[0024] Add modifier and co-solvent into the reactor, raise the temperature to 110°C under the protection of nitrogen, add vinyl monomers dropwise, and complete the dropwise addition within 1 to 4 hours, and keep warm for 0 to 1 hour;

[0025] Add the additional initiator dissolved in the co-solvent dropwise, complete the dropwise addition within 30 minutes, and keep the reaction for 1 to 4 hours;

[0026] Cool down to 70°C, add a neutralizer dropwise until the neutralization degree is 80%, and discharge to obtain a water-dispersed modified acrylate coating resin.

[0027] The neutralizing agent used is a conventional neutralizing agent, including ethylamine, propylamine, benzylamine, dimethylamine, dibutylamine, dimethylaniline, diethylaniline, dimethylethanolamine, trimethylamin...

Embodiment 1

[0036] Add 39.5g of acetoacetyl tert-butyl ester and 27.3g of Boltorn with 16 terminal hydroxyl numbers in a 100ml three-necked flask equipped with a water separator and a reflux condenser. TMH20, the temperature was raised to 120°C while nitrogen flow was passed, and after 1.5 hours of reaction, the conversion rate was calculated to be 99% based on the mass of tert-butanol collected by the water separator, and the product was a transparent liquid.

[0037] In a 500ml four-neck flask equipped with a stirrer, condenser, thermometer and oil bath heating device, add 5g of acetoacetyl-blocked Boltorn TM H20, 25g propylene glycol monomethyl ether and 15g isopropanol, stir evenly, and heat up to 100°C under nitrogen protection;

[0038] Mix 22 g methyl methacrylate, 12 g styrene, 40 g butyl acrylate, 10 g isobornyl methacrylate, 10 g hydroxyethyl methacrylate, 6 g acrylic acid, 1 g dibenzoyl peroxide (BPO) and 1 g dodeca Add alkyl mercaptan to a Erlenmeyer flask, mix evenly, after ...

Embodiment 5

[0043] Add 31.6g of acetoacetyl tert-butyl ester and 6.8g of pentaerythritol into a 100ml three-necked flask equipped with a water separator and a reflux condenser, raise the temperature to 110°C while flowing nitrogen, and collect tert-butyl with a water separator after reacting for 3 hours The quality of alcohol calculates that the conversion rate is 99%, and the product is a transparent liquid.

[0044] In a 500ml four-neck flask equipped with a stirrer, condenser, thermometer and oil bath heating device, add 5g of acetoacetyl-capped pentaerythritol, 25g of propylene glycol monomethyl ether and 15g of isopropanol, stir well, and heat up under nitrogen protection to 100°C;

[0045] Add 22g of methyl methacrylate, 12g of styrene, 40g of butyl acrylate, 10g of isobornyl methacrylate, 10g of hydroxyethyl methacrylate, 6g of acrylic acid, 1g of BPO and 1g of dodecyl mercaptan into an Erlenmeyer flask , mix evenly, after the BPO dissolves, use a separatory funnel to drop it into...

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Abstract

The invention discloses a preparation method of water dispersed modified acrylic ester resin for automobile finish varnish. The raw materials of the resin comprise the following components in parts by mass: 5 to 20 parts of modifier, 100 parts of allyl monomer, 1.2-1.8 parts of initiator, 0.8-1.2 parts of molecular weight regulator and 35 to 50 parts of cosolvent, and the resin is obtained by polymerization reaction at 100 -120 DEG C. The modifier is acetoacetyl sealed end BoltornTM series dendritic hyperbranched polyester or acetoacetyl sealed end pentaerythritol. The cured varnish film of the water-based automobile finish varnish prepared by modified resin obtained by the method of the invention has obviously higher water resistance, alkali resistance, acid resistance, salt fog resistance and ultraviolet light aging resistance compared with not modified water-based automobile finish varnish, and has high gloss and excellent physical mechanical property.

Description

technical field [0001] The invention relates to a preparation method of water-dispersed modified acrylate resin. Background technique [0002] Due to the high solvent content of more than 80wt%, solvent-based coatings emit a large amount of volatile organic compounds (VOC) during production, spraying construction and coating film baking, causing pollution to the workplace and the earth's atmosphere, and seriously endangering the ecological environment and human health. Water-based coatings use water as the dispersion medium, have low VOC content, and meet environmental protection requirements, thus becoming the main direction of the current and future development of the coatings industry. [0003] As a car finish varnish, the water-based acrylic paint evaporates slowly due to the high surface tension of water, and the paint film is prone to defects such as bubbles, pinholes, shrinkage, and sagging. It is also inferior to the corresponding solvent-based paint cured paint fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/02C08F220/18C08F220/14C08F212/08C08F220/28C08F220/06C09D151/08C09D133/08
Inventor 王炼石任丽包春磊阮伟明张安强冯兆华冯兆均
Owner GUANGDONG YATU CHEM
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