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Waterborne acrylic alkyd resin and preparation method and application thereof

A technology of acrylic alkyd and acrylic acid, applied in the chemical field, can solve the problems affecting the dryness, hardness, gloss and water resistance of the coating film, and achieve the effects of improving hydrolysis stability, good hydrolysis resistance and high storage stability

Inactive Publication Date: 2011-07-20
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these emulsifiers usually cannot participate in film formation, thus affecting the dryness, hardness, gloss and water resistance of the coating film.

Method used

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  • Waterborne acrylic alkyd resin and preparation method and application thereof
  • Waterborne acrylic alkyd resin and preparation method and application thereof
  • Waterborne acrylic alkyd resin and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation of embodiment 1 aqueous acrylic alkyd resin emulsion

[0039] Add 100ml of organic solvent butyl acetate into a four-necked flask equipped with mechanical stirring, reflux condenser, and 2 constant pressure dropping funnels, pass nitrogen gas for 30min and heat to 105°C, then separate the acrylic monomer and initiator and The chain transfer agent is placed in two constant-pressure dropping funnels, and dripped at a constant speed within 3.5 hours at a constant temperature. Insulate and react for 1.5 hours, cool down to room temperature, and store the obtained acrylic acid prepolymer for future use. The consumption of four kinds of acrylic acid monomers is: methyl methacrylate 35.0g, butyl methacrylate 45.0g, methacrylic acid 10g, acrylic acid 12.5g; Initiator is azobisisobutyronitrile (AIBN), and its consumption is 0.4wt% of the total amount of the four acrylic monomers, the chain transfer agent is dodecyl mercaptan, and its amount is 8wt% of the total ...

Embodiment 2

[0041] The preparation of embodiment 2 aqueous acrylic alkyd resin emulsions

[0042] Add 105ml of xylene into a four-neck flask equipped with mechanical stirring, reflux condenser, and two constant pressure dropping funnels, pass nitrogen gas for about 30min and heat to 100°C, then separate the four acrylic acid monomer mixtures (methacrylic acid 35.0 g of methyl ester, 40.0 g of ethyl methacrylate, 12 g of methacrylic acid, 10 g of acrylic acid, azobisisobutyronitrile (AIBN): 0.2 wt%) and chain transfer agent (dodecyl mercaptan: 10 wt%) Put it in two constant pressure dropping funnels, and drop it at a constant speed for 3 hours at a constant temperature. Insulate and react for 1.5 hours, cool down to room temperature, and store the obtained acrylic acid prepolymer for future use.

[0043] Add 20.8g of tung oil, 8.6g of pentaerythritol, and 0.12g of lithium hydroxide into a four-necked flask equipped with a stirrer, a thermometer, and a reflux condenser, pass nitrogen gas f...

Embodiment 3

[0045] Storage stability and hydrolysis resistance of aqueous acrylic alkyd resin emulsion of the present invention

[0046] The aqueous acrylic alkyd resin emulsion prepared in Example 1 was placed in a 25°C incubator, and its pH value was tested to be 7.5 after storage for 6 months, and the viscosity change (coating -4 cups) was less than 5%. The test results show that the aqueous acrylic alkyd resin emulsion has good storage stability and hydrolysis resistance.

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Abstract

The invention provides waterborne acrylic alkyd resin and emulsion thereof. The waterborne acrylic alkyd resin is prepared by the following steps of: performing free radical polymerization on four acrylic monomers, namely acrylic acid, methyl methacrylate, methyl acrylate and butyl methacrylate, an initiating agent and a chain transfer agent in an organic solvent to obtain an acrylic prepolymer, then performing ester exchange reaction on vegetable oil and trimethylolpropane to obtain an alcoholysis product, and performing polycondensation reaction on the acrylic prepolymer and the alcoholysisproduct to obtain the product; and the emulsion is prepared by adding a neutralizer, a cosolvent and distilled water to the waterborne acrylic alkyd resin. In the waterborne acrylic alkyd resin provided by the invention, long alkane structures are connected with carbon atoms on the alpha and beta positions on two sides of an ester bond in the resin molecule, thus improving the hydrolytic stability of the ester bond. Therefore, the waterborne acrylic alkyd resin has good hydrolytic resistance and storage stability and can be used as a main component of waterborne paints and adhesives, and varnish prepared from the resin provided by the invention has good dryness, adhesive force and hardness.

Description

technical field [0001] The invention belongs to the field of chemistry, and in particular relates to a water-based alkyd resin and a preparation method thereof. Background technique [0002] Alkyd resin is a common resin used in coatings. It has abundant sources of raw materials and low price, mature synthesis technology, and good overall performance of resin coating films. Therefore, alkyd resin has become one of the most widely used synthetic resins. The current alkyd resin is still mainly solvent-based, but with the development of economy and the requirements of environmental protection, it has become the development trend of the industry to make alkyd resin water-based. Replacing organic solvents with water can effectively reduce environmental pollution caused by VOCs (volatile organic compounds), and can also reduce costs. However, in addition to the safety and health benefits brought by the water-based alkyd resin, its hydrolysis resistance, storage stability, and coa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08F220/18C08F220/14C08F220/06C08L67/08C09D167/08C09D7/12
Inventor 梁丽芸肖啸谭必恩冯俊胡爱琼刘琴程贤
Owner HUAZHONG UNIV OF SCI & TECH
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