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Production of aqueous-dispersing alkyd resin

A technology of alkyd resin and dispersibility, applied in the chemical industry, can solve the problems of alkyd resin coating water resistance, etc., and achieve the effect of high hardness, high product purity and simple process

Inactive Publication Date: 2007-09-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, emulsifiers also have an effect on the water resistance of alkyd resin coatings
This shows that the various methods of preparing water-dispersible alkyd resin that adopt at present all have certain shortcoming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 29g of dehydrated castor oil and 25g of trimethylolpropane into the four-necked flask, and raise the temperature to 180°C under nitrogen protection and condensing and reflux conditions. When the solid reactants are completely melted, start stirring. During this process, 0.005 g of lithium hydroxide was added to facilitate the transesterification reaction. Keep the reaction temperature for 1 hour, add 24g of phthalic anhydride, and raise the temperature to 220°C for esterification. In the later stage of 3h, it was carried out under reduced pressure, and the vacuum degree was maintained at about 10132.5 Pa (0.1 atmospheric pressure). Measure system acid value during this period, when system acid value is lower than 8mgKOH / g, stop this step reaction. Lower the temperature of the reaction system to 190°C, add 6.3g of trimellitic anhydride, measure the acid value of the system after 1 hour of reaction, when the acid value reaches between 40mg KOH / g and 60mg KOH / g, lower...

Embodiment 2

[0034] According to the formula of Example 2 in Table 1, adopt the same method of Example 1 to prepare water-dispersible alkyd resin. The transesterification reaction temperature of dehydrated castor oil and trimethylolpropane is 190° C., and the time is 2 hours. The esterification temperature after adding phthalic anhydride was 240°C, and the temperature when trimellitic anhydride was added was 190°C. The temperature at the time of adding ethylene glycol butyl ether and triethylamine was 120°C.

[0035] The properties of the obtained resin and paint film are shown in Example 2 of Table 2.

Embodiment 3

[0037] According to the formula of example 3 in table 1, adopt the same method of embodiment 1 to prepare water-dispersible alkyd resin. The temperature of the transesterification reaction between dehydrated castor oil and trimethylolpropane is 200° C., and the time is 1 h. The esterification temperature after adding phthalic anhydride was 220°C, and the temperature when trimellitic anhydride was added was 200°C. The temperature at the time of adding ethylene glycol butyl ether and triethylamine was 140°C.

[0038] The properties of the obtained resin and paint film are shown in Example 3 of Table 2.

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PUM

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Abstract

Production of hydro-dispersion alkyd resin is carried out by ester-exchange reacting for dewatered castor oil and tri(hydroxymethyl)propane under existence of lithium hydroxide, adding into phthalic anhydride or maleic anhydride, ester reacting at high-temperature, lowering temperature while reaching into a certain of acid value, adding into trimellitic anhydride, reacting, neutralizing by neutralizer, adding into flux, and adding into deionized-water to obtain the final product. It's simple and cheap, has more purity and less impurities, no environmental pollution, excellent stability, hardness, impact and water resistances.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to water-dispersible alkyd resin. Background technique [0002] Alkyd resin is the most important resin for coatings. It is a linear resin synthesized by polycondensation reaction of polyhydric alcohol, polybasic acid and monobasic acid. Alkyd resin is also the largest and earliest synthetic resin in the paint industry. [0003] Most of the alkyd resins currently used are solvent-based resins, which are the main source of volatile organic compounds (VOC) in the coatings industry. In order to strengthen environmental protection, various countries have enacted environmental regulations one after another, and put forward strict restrictions on the VOC content in coatings. Therefore, the development of water-dispersible alkyd resins with good properties will have very broad application prospects. [0004] At present, the preparation methods of water-dispersible alkyd resin mainly includ...

Claims

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Application Information

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IPC IPC(8): C08G63/49C08G63/78
Inventor 王国建刘峰刘琳
Owner TONGJI UNIV
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