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Modified alkyd resin, preparation method thereof and two-component glossy white finish

An alkyd resin, white topcoat technology, used in coatings, polyester coatings, etc., can solve the problems of high viscosity, insufficient paint film, fast drying speed, etc., to achieve product stability, excellent gloss and clarity, and easy operation. simple effect

Active Publication Date: 2013-06-12
CARPOLY CHEM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, since coconut oleic acid and lauric acid monomers are mainly composed of dodecyl-carbon saturated carboxylic acids, the alkyd resin modified by coconut oleic acid and lauric acid has a higher viscosity and a faster drying speed. , the paint film is not plump enough

Method used

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  • Modified alkyd resin, preparation method thereof and two-component glossy white finish
  • Modified alkyd resin, preparation method thereof and two-component glossy white finish
  • Modified alkyd resin, preparation method thereof and two-component glossy white finish

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preparation example Construction

[0074] The invention provides a kind of preparation method of modified alkyd resin, comprising:

[0075] reacting an alkyd mixture comprising:

[0076] 15-25 parts by weight of 3,5,5-trimethylhexanoic acid;

[0077] 3 ~ 9 parts by weight of 1,2-propanediol;

[0078] 25 ~ 35 parts by weight of phthalic anhydride;

[0079] 0.35 ~ 0.75 parts by weight of maleic anhydride;

[0080] The trimethylolpropane of 18~24 parts by weight;

[0081] The pentaerythritol of 2~5 parts by weight;

[0082] 2 to 4 parts by weight of water-carrying agent;

[0083] 0.05~0.2 parts by weight of the color-reducing antioxidant;

[0084] 14-16 parts by weight of dilute solvent.

[0085] The present invention reacts the alkyd mixture containing polyalcohol, organic acid such as 3,5,5-trimethylhexanoic acid and auxiliary agent as raw material to generate modified alkyd resin, which is applied to It has good performance in two-component glossy white topcoat, especially excellent film fullness.

[0...

Embodiment 1

[0128] Nitrogen was passed through the empty reactor for 3 minutes in advance, and the nitrogen flow rate was 5m 3 / h;

[0129] 15 weight parts of 3,5,5-trimethylhexanoic acid, 3 weight parts of 1,2-propanediol, 2 weight parts of xylene and 0.05 weight parts of hypophosphorous acid were successively dropped into the above-mentioned reactor, and the Put 25 parts by weight of phthalic anhydride, 0.35 parts by weight of maleic anhydride, 18 parts by weight of trimethylolpropane and 2 parts by weight of pentaerythritol into the above-mentioned reaction kettle in sequence, heat up under stirring, and heat up to 160 ° C, heat preservation and reflux 2 hours, then raise the temperature to 220°C within 3 hours, keep warm until the acid value is ≤18mgKOH / g, and the viscosity is 12 seconds to 18 seconds / 25°C Grignard tube, then cool down until the temperature in the reaction kettle drops to 180°C , the crude product was obtained;

[0130] Open the nitrogen of the dilute kettle and con...

Embodiment 2

[0137] Nitrogen was passed through the empty reactor for 8 minutes in advance, and the nitrogen flow rate was 2m 3 / h;

[0138] 25 weight parts of 3,5,5-trimethylhexanoic acid, 9 weight parts of 1,2-propanediol, 4 weight parts of xylene and 0.2 weight parts of hypophosphorous acid were dropped into the above-mentioned reactor successively, and the 35 parts by weight of phthalic anhydride, 0.75 parts by weight of maleic anhydride, 24 parts by weight of trimethylolpropane and 5 parts by weight of pentaerythritol were successively put into the above-mentioned reaction kettle from the special feeding port, and the temperature was raised under stirring until the temperature was raised to 185°C, and the heat preservation and reflux 1 hour, then raise the temperature to 200°C within 5 hours, keep warm until the acid value is ≤18mgKOH / g, and the viscosity is 12 seconds to 18 seconds / 25°C Grignard tube, and then cool down until the temperature in the reaction kettle drops to 200°C , t...

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Abstract

The invention provides modified alkyd resin and a preparation method of the modified alkyd resin. The modified alkyd resin is prepared by carrying out a reaction on an alkyd mixture, wherein the alkyd mixture comprises 15-25 parts by weight of 3, 5, 5-trimethyl hexanoic acid; 3-9 parts by weight of 1, 2-propanediol, 25-35 parts by weight of phthalic anhydride; 0.35-0.75 part by weight of maleic anhydride, 18-24 parts by weight of trimethylol propane, 2-5 parts by weight of pentaerythritol, 2-4 parts by weight of water aqua, 0.05-0.2 part by weight of subtractive antioxidant and 14-16 parts by weight of letdown solvent. Because the 3, 5, 5-trimethyl hexanoic acid replaces cocinic acid and lauric acid to modify alkyd resin, a finish film has excellent fullness, gloss and yellowing resistance and is easy to use. The invention further provides a two-component glossy white finish.

Description

technical field [0001] The invention relates to the technical field of alkyd resin, in particular to a modified alkyd resin, a preparation method thereof and a two-component bright white topcoat. Background technique [0002] Alkyd resins are generally a type of oil-modified polyester resins formed by condensation polymerization of polyols, dibasic acids and fatty acids or oils. Due to the good film-forming properties of alkyd resin, the cured film layer has gloss, toughness and strong adhesion, as well as good wear resistance, weather resistance and insulation. It is mainly used in the field of coatings , can be made into varnish, primer and putty etc. [0003] Among them, for the alkyd resin used in the two-component bright white topcoat, due to the requirement of its weather resistance, it is generally modified by fatty acids with saturated carbon chains, such as coconut oleic acid or lauric acid and other carboxylic acids. modified. [0004] However, since coconut ole...

Claims

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Application Information

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IPC IPC(8): C08G63/52C09D167/06C09D7/06C09D7/14C09D7/47C09D7/80
Inventor 莘建忠何燚鹏钟永贤
Owner CARPOLY CHEM GRP
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