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Quick-drying hydroxyacrylic resin aqueous dispersion with long working life and preparation method thereof

A technology of hydroxyacrylic acid and pot life, which is applied in the field of fast-drying hydroxy acrylic resin aqueous dispersion, which can solve the problems of reduced pot life, difficulty in balancing drying speed and pot life, and paint film defects, and achieves long pot life and excellent gloss and fullness, excellent water resistance and solvent resistance

Active Publication Date: 2017-09-15
广东拓普合成科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, none of the above patents solves the problem that the drying speed and the pot life are difficult to balance when the aqueous dispersion of hydroxyacrylic resin is cured with a water-based polyisocyanate curing agent. The existing aqueous dispersion of hydroxyacrylic acid does not add a catalyst when making water-based two-component polyurethane coatings. It is difficult to meet the drying speed required by the construction, but if additional metal catalysts are added, the pot life will be significantly reduced, and some paint film defects will be caused

Method used

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  • Quick-drying hydroxyacrylic resin aqueous dispersion with long working life and preparation method thereof
  • Quick-drying hydroxyacrylic resin aqueous dispersion with long working life and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 Add 25.0g propylene glycol methyl ether acetate and 30.0g ethylene glycol butyl ether into the reactor, blow nitrogen, stir and heat up to 125°C, start to drop 4.5g ethyl acetoacetate methacrylate, 40.0g formazan A mixture of methyl acrylate, 41.0g styrene, 52.2g hydroxyethyl acrylate, 69.8g n-butyl methacrylate, and 6.2g tert-butyl peroxybenzoate, control the rate of addition uniformly, and drop the mixture in about 3 hours , keep warm for 30min after dripping. After the heat preservation is completed, start to drop a mixture of 33.1g methyl methacrylate, 25.3g hydroxyethyl acrylate, 10.7g butyl acrylate, 10.9g acrylic acid and 3.1g tert-butyl peroxybenzoate, dropwise at a constant speed, within 1h After dripping and keeping warm for 30 minutes, add 1.0 g of tert-butyl peroxybenzoate and keep warm for 3 hours. Cool down to 80°C, add 10.0g dimethylethanolamine and 0.8g dibutyltin dilaurate, stir for 30min, then add 300.0g deionized water at a constant speed w...

Embodiment 2

[0041] Embodiment 2 The mixture of 40g ethylene glycol butyl ether and 30g Solvesso 100 (naphtha solvent) was added in the reactor, nitrogen was blown, the temperature was raised to 150°C with stirring, and 6.2g of acetoacetate ethyl methacrylate was added dropwise, Mixture of 60.0g methyl methacrylate, 31.5g methyl styrene, 42.8g hydroxyethyl methacrylate, 50.3g n-butyl acrylate and 9.1g di-tert-butyl peroxide, control the dropping rate uniformly, about 2.5h After the mixture was dripped, it was kept warm for 30 minutes. After the insulation is completed, start to drop the mixture of 41.1g methyl methacrylate, 22.8g hydroxyethyl methacrylate, 8.9g butyl acrylate, 10.9g methacrylic acid and 4g di-tert-butyl peroxide, dropwise at a constant speed, Add 0.8g of di-tert-butyl peroxide after 30min of heat preservation, continue heat preservation for 3h, lower the temperature to 80°C, add 12.2g of triethylamine and 1.2g of zirconium hydroxide, stir for 30min, and keep the temperatur...

Embodiment 3

[0044] Example 3 A mixture of 40.0g propylene glycol butyl ether and 40.0g glycidyl tertiary carbonic acid ester was added to the reactor, nitrogen was blown, the temperature was raised to 140°C with stirring, and 5.2g ethyl acetoacetate methacrylate, 35.7g formazan A mixture of methyl acrylate, 43.2g styrene, 43.2g hydroxyethyl methacrylate, 65.9g n-butyl methacrylate, and 3.8g cumene peroxide, control the dropping rate evenly, and finish dropping the mixture in about 4 hours , keep warm for 30min after dripping. After the insulation was completed, 31.6g methyl methacrylate, 20.2g hydroxyethyl methacrylate, 10.6g butyl acrylate, 8.2g 2-acrylamido-2-methylpropanesulfonic acid, 20g isopropanol, Add a mixture of 2.1g cumene peroxide dropwise at a constant speed, and finish dropping within 1h30min. After keeping warm for 30min, add 0.7g cumene peroxide, continue keeping warm for 3h, cool down to 80°C, and add 11.6g dimethylethanolamine and 1.0g of bismuth hydroxide, after stirri...

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Abstract

The invention relates to a quick-drying hydroxyacrylic resin aqueous dispersion with long working life and a preparation method thereof. Metal ions are chelated in the aqueous dispersion and are used as a catalyst, and in an aqueous phase system, a catalyst component is wrapped by a hydrophobic core layer of the dispersion, but is not contacted with an isocyanate component, so that the activation period is not shortened; in the later stage of construction, moisture is basically evaporated completely, a hydrophobic part inside the dispersion is contacted and fused with the isocyanate component, and the metal catalyst starts to catalyze a reaction of the hydroxyl group and the isocyanate to promote curing of a coating film, so that the aqueous dispersion has the characteristics of long working life and quick drying. When the aqueous dispersion is applied to a waterborne double-component polyurethane coating, the coating film has excellent gloss and fullness, high hardness, good flexibility, excellent water resistance and solvent resistance; the aqueous dispersion can be widely applied to coating of wood furniture and large transporting tools, industrial coating and automobile repairing.

Description

technical field [0001] The invention relates to a fast-drying type hydroxyacrylic resin water dispersion with long pot life, especially relates to its preparation method and composition. Background technique [0002] Due to the increasingly stringent environmental protection regulations, the use of solvent-based coatings is restricted due to serious environmental and health problems. The development of environmentally friendly water-based coatings is the current development trend of the coatings industry. Water-based acrylic coatings have the characteristics of anti-corrosion, water resistance, good film-forming properties, weather resistance, good color retention, and less pollution. They have been widely used in the finishing of wood, metal, building interior and exterior walls, plastics, and glass. Especially the water-based two-component polyurethane coating composed of hydroxyl-containing water-based acrylate dispersion and water-based polyisocyanate, because it can be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F222/20C08F212/08C08F220/28C08F220/18C08F220/06C08F212/12C08F220/58C08F8/42C09D175/04C08G18/62
CPCC09D175/04C08F8/42C08F220/14C08G18/6229C08F222/20C08F212/08C08F220/281C08F220/1804C08F220/06C08F220/585C08F212/12
Inventor 谭星王韬朱伯承
Owner 广东拓普合成科技股份有限公司
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