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Preparation method for low acid value and low VOC waterborne acrylic acid and fatty acid modified epoxy resin

A fatty acid modification, water-based acrylic technology, used in coatings, anti-corrosion coatings, etc., can solve the problems of poor water resistance, poor storage stability, and poor rust resistance of resins, and achieve good water resistance, low VOC, and good dryness. Effect

Inactive Publication Date: 2015-04-15
BEIJING JINHWEILI APPLIED CHEM PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-based alkyd resins have poor storage stability due to the hydrolysis of their own ester bonds, and their drying at room temperature is also very slow
The patent (CN1375535A) uses alkyd resin as the core and uses acrylic acid (ester) to modify the alkyd resin in the form of emulsion polymerization, which improves the dryness and hydrolysis of the alkyd resin, but because it is a product of emulsion polymerization , there are a lot of emulsifiers in the emulsion, it is easy to appear the phenomenon of flash rust, and its anti-rust performance is poor
The patent (CN101864044A) of Hunan Xiangjiang Paint Co., Ltd. is a kind of water-based acrylic modified epoxy ester resin, which adopts the mode of core-shell polymerization and has good storage stability, but its emulsion still contains 10-20% solvent, resulting in relatively Many VOCs
And in its synthesis method, only the resin with a higher acid value (20-40mgKOH / g) can have better water dispersibility, resulting in poor water resistance of the resin, and its scope of application is baking paint

Method used

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  • Preparation method for low acid value and low VOC waterborne acrylic acid and fatty acid modified epoxy resin
  • Preparation method for low acid value and low VOC waterborne acrylic acid and fatty acid modified epoxy resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Add 320g of epoxy resin E20, 30g of dehydrated ricinoleic acid, 220g of linolenic acid, and 0.5g of zinc oxide into the reaction bottle, heat up to 200-220°C, react until the acid value is below 5mgKOH / g, cool down to 160°C and add Ethylene glycol butyl ether 50g. Keep the temperature at 145-150°C to obtain fatty acid modified epoxy resin;

[0037] (2) Mix 20g of acrylic acid, 50g of styrene, and 50g of methyl methacrylate, add 5g of di-tert-butyl peroxide, mix well, and drop them into the above materials for 2-3hrs, and add three times after the addition Add 5g of di-tert-butyl peroxide, and finally keep warm for 3hr to obtain acrylic acid, fatty acid modified epoxy resin;

[0038] (3) Cool the modified resin to 80°C, add 50g of triethylamine, 22g of cobalt and zinc mixed drier, 150g of ethanol, stir evenly, drop 1000g of distilled water at 40°C into the resin, and emulsify;

[0039] (4) Put the emulsified emulsion into a three-necked bottle, install a vacuum dev...

Embodiment 2

[0041] (1) Add 280g of epoxy resin E12, 30g of dehydrated ricinoleic acid, 200g of tall oleic acid, and 0.5g of zinc oxide into the reaction bottle to raise the temperature to 200-220°C, react until the acid value is below 5mgKOH / g, and cool down to 118°C Add 220 g of n-butanol. Keep the temperature at 115°C to obtain fatty acid modified epoxy resin;

[0042] (2) Mix 22g of acrylic acid and 100g of methyl methacrylate, add 5g of tert-butyl peroxybenzoate, mix well and drop it into the above material for 2-3hr, add benzene peroxide three times after the dropwise addition Tert-butyl formate 5g, last insulation 3hr, obtains acrylic acid, the epoxy resin of fatty acid modification;

[0043](3) Cool the modified resin to 80°C, add 55g of triethylamine, 22g of cobalt and zinc mixed drier, stir evenly, drop 1000g of distilled water at 40°C into the resin, and emulsify;

[0044] (4) Put the emulsified emulsion into a vacuum container, install the vacuum device, control the temperatu...

Embodiment 3

[0046] (1) Add 98g of epoxy resin E12, 10g of dehydrated ricinoleic acid, 90g of linolenic acid, and 0.2g of zinc oxide into the reaction bottle and raise the temperature to 200-220°C, react until the acid value is below 5mgKOH / g, cool down to 118°C and add 130 g of n-butanol. Keep the temperature at 115°C to obtain fatty acid modified epoxy resin;

[0047] (2) Mix 15g of acrylic acid and 115g of styrene, add 5g of tert-butyl peroxybenzoate, mix well and drop it into the above material with 3-4hr, add tert-butyl peroxybenzoate three times after the dropwise addition Ester 1g, last insulation 3hr, obtains acrylic acid, the epoxy resin of fatty acid modification;

[0048] (3) Cool down the modified resin to 80°C, add 30g of N,N-dimethylethanolamine, 10g of cobalt and zinc mixed drier, stir evenly, drop 500g of distilled water at 40°C into the resin, and emulsify;

[0049] (4) Put the emulsified emulsion into a three-necked bottle, install a vacuum device, control the temperatu...

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Abstract

Belonging to the paint field, the invention relates to a preparation method for a low acid value and low VOC waterborne acrylic acid and fatty acid modified epoxy resin. The method includes: firstly modifying epoxy resin with fatty acid, then conducting modification with acrylic acid and acrylate monomer under the action of an initiator, then adding a neutralizer and a drier, adding water to perform emulsification, and reducing pressure to remove the solvent, thus obtaining a low acid value and low VOC waterborne acrylic acid and fatty acid modified epoxy resin emulsion, which has an acid value of 10-15mgKOH / g, a solid content of 30-50%, and a VOC content of less than 7%. Due to a low acid value, the obtained resin has excellent water resistance, and because of the extremely low VOC content, the emission of pollutants is greatly reduced, and the harm to the human is lowered. In addition, due to high unsaturated fatty acid content and epoxy resin content and adding of the drier, the resin itself can have the characteristics of natural drying at room temperature, excellent anti-rust performance and the like.

Description

technical field [0001] The invention discloses a preparation method of water-based acrylic acid and fatty acid-modified epoxy resin with low acid value and low VOC, belonging to the field of water-based coatings. Background technique [0002] At present, coating resins are mainly solvent-based resins, such as alkyd resins and epoxy ester resins. Water-based alkyd resins have poor storage stability due to the hydrolysis of their own ester bonds, and their drying at room temperature is also very slow. The patent (CN1375535A) uses alkyd resin as the core and uses acrylic acid (ester) to modify the alkyd resin in the form of emulsion polymerization, which improves the dryness and hydrolysis of the alkyd resin, but because it is a product of emulsion polymerization , There are a lot of emulsifiers in the emulsion, which is prone to flash rust, and its anti-rust performance is poor. The patent (CN101864044A) of Hunan Xiangjiang Paint Co., Ltd. is a kind of water-based acrylic mo...

Claims

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Application Information

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IPC IPC(8): C08F283/10C08F220/06C08F212/08C08F220/14C08F220/18C08F220/28C08F220/32C08G59/16C09D151/08C09D5/08
Inventor 王英秦文
Owner BEIJING JINHWEILI APPLIED CHEM PROD
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