A kind of self-catalyzed alkyd resin and preparation method thereof

A self-catalyzed alkyd and resin technology, applied in coatings, polyester coatings, etc., can solve the problems of affecting the transparency of the paint film, shortening the drying time of the paint film, and different gloss of the paint film, so as to achieve stable catalytic effect and reduce Lacquer production cost and effect of shortening drying time

Active Publication Date: 2021-06-04
鹤山市肇能新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing glycerin system or a small amount of pentaerythritol and a large amount of ethylene glycol (diethylene glycol) alkyd system can be used as a PU primer in areas with low temperature, which has the disadvantages of slow drying speed and poor sandability
When making PU primers or matte topcoats, we usually add organotin or organic amines as the drier of the system to accelerate the reaction of -OH in the resin with -NCO groups in the curing agent and shorten the life of the paint film. Drying time; but if the external drier is not stirred evenly, it is easy to cause the gloss of the paint film to be different, and it is easy to affect the transparency of the paint film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 2,3-dihydroxypropionic acid into the beaker, slowly add zinc hydroxide into it, and stir at the same time to obtain zinc dihydroxypropionate, which is a self-made drier. Add 300g of glycerin, 50g of benzoic acid, and 280g of soyoleic acid , 350g of phthalic anhydride, 0.5g of hypophosphorous acid, 100g of xylene, and 3g of self-made drier were put into a four-necked flask, heated to reflux with a heating mantle, reacted at 190°C for 3 hours, and then divided into water to raise the temperature; when the temperature was raised to 205°C, the reaction After 5 hours, the acid value of the reaction product was detected. When the acid value was 15 mgKOH / g, the temperature was lowered, and when the temperature was lowered to 100° C., 400 g of xylene was added and stirred evenly to obtain a self-catalyzed alkyd resin.

Embodiment 2

[0037] Add 2,3-dihydroxypropionic acid into the beaker, slowly add calcium hydroxide into it, and stir at the same time to obtain calcium dihydroxypropionate, which is a self-made drier. Add 100g of glycerin, 100g of benzoic acid, and 200g of soy oil , 280g of phthalic anhydride, 2g of color reducer, 50g of xylene, and 5g of self-made drier were put into a four-necked flask, heated to reflux with a heating mantle, reacted at 180°C for 3 hours, and then heated up with water; heated to 200°C, reacted After 5 hours, the acid value of the reaction product was detected. When the acid value was 10 mgKOH / g, the temperature was lowered, and when the temperature was lowered to 100° C., 400 g of xylene was added and stirred evenly to obtain a self-catalyzed alkyd resin.

Embodiment 3

[0039] Add 2,3-dihydroxybutyric acid into the beaker, slowly add zinc hydroxide into it, and stir at the same time to obtain zinc dihydroxybutyrate, which is a self-made drier. Mix 150g of glycerin, 75g of benzoic acid, and 350g of soyoleic acid , 200g of phthalic anhydride, 1.6g of color reducer, 75g of xylene, and 4g of self-made drier were put into a four-necked flask, heated to reflux with a heating mantle, reacted at 200°C for 3 hours, and then divided into water to raise the temperature; the temperature was raised to 210°C, After reacting for 5 hours, detect the acid value of the reaction product. When the acid value is 20 mgKOH / g, cool down. When the temperature drops to 100° C., add 400 g of xylene and stir evenly to obtain self-catalyzed alkyd resin.

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Abstract

The invention discloses a self-catalyzed alkyd resin and a preparation method thereof. During the preparation, glycerin, benzoic acid, soy oil acid, phthalic anhydride, color reducing agent, xylene and self-made drier are put into a four-necked flask, and the Raise the temperature to reflux, react at 180-200°C for 3 hours, then divide the water and raise the temperature to 200-210°C, react for 5 hours, when the acid value is 10-20mgKOH / g, cool down to 100°C, add xylene and stir to obtain autocatalytic Alkyd resin. The alkyd resin achieves self-catalysis by introducing a group with drying effect, and can shorten the drying time of PU paint without adding a drier when making paint. Compared with an external drier, the catalytic effect It is more stable, and there is no problem of uneven gloss of the paint film caused by uneven precipitation and dispersion of the external drier, which improves the sandability and yellowing resistance of the primer, and reduces the cost of the customer's later paint production.

Description

technical field [0001] The invention relates to the technical field of resin preparation, in particular to a self-catalyzed alkyd resin and a preparation method thereof. Background technique [0002] PU paint is the collective name of all polyurethane coatings. Its film-forming method is natural film-forming, with good hardness, good fullness, good adhesion, good durability, and good hand feeling. The paint film is thin and not very hard; but its adhesion is particularly good, and any wood with such a high oil content as teak will do. PU paint is generally divided into: high-gloss paint, gloss paint, semi-mat paint, matt paint. [0003] The existing glycerin system or a small amount of pentaerythritol and a large amount of ethylene glycol (diethylene glycol) alkyd system can be used as a PU primer in areas with low temperature, which has the disadvantages of slow drying speed and poor sandability. When making PU primers or matte topcoats, we usually add organic tin or orga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/49C08G63/78C09D167/08C09D7/61C09D7/63
Inventor 邓肇能刘开国
Owner 鹤山市肇能新材料有限公司
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