A kind of polyester resin for powder coating with excellent flexibility and preparation method thereof
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A polyester resin and powder coating technology, applied in powder coatings, polyester coatings, coatings, etc., can solve problems such as low softening point and poor coating flexibility, and achieve low softening point, soft chain segments, and easy process operation Effect
Active Publication Date: 2021-01-26
安徽永利新材料科技有限公司
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[0006] In view of the poor flexibility of the powder coating coating after curing of the N,N,N',N'-tetrakis(β-hydroxyethyl)adipamide (HAA) curing system in the prior art, in order to improve the polyester powder The flexibility, environmental protection and safety of coating, the object of the present invention is to provide a kind of polyester resin for powder coating with good flexibility and preparation method thereof, the raw material monomer linear structure that this method uses is better, and the obtained polyester resin The chain segment is soft, the softening point is low, and the process is stable
Method used
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Embodiment 1
[0030] A kind of polyester resin for powder coating with good flexibility and preparation method thereof, its raw material composition and molar ratio are:
[0031]
[0032]
[0033] The method for preparing the above-mentioned polyester resin for powder coatings with excellent flexibility may further comprise the steps:
[0034] A. Add the terephthalic acid, dipropylene glycol, and catalyst in the formula amount into the reaction kettle, and heat the esterification reaction below 175°C for 2-4h;
[0035] B. Then add the formulated amount of 4-methoxyphthalic acid, neopentyl glycol and ethylene glycol salicylate to the mixed material prepared in the above steps, and gradually heat up from 175°C to 200°C under nitrogen protection , the heating rate is controlled at 10°C / h, and the reaction is kept for 4-8h until no obvious distillate is distilled out, and the acid value of the reactant is less than 110mgKOH / g;
[0036] C. Then add adipic acid and 1,7-heptanediol in the p...
Embodiment 2
[0040] A kind of polyester resin for powder coating with good flexibility and preparation method thereof, its raw material composition and molar ratio are:
[0041]
[0042] Its preparation method etc. are the same as embodiment 1.
[0043] The acid value of the prepared polyester resin: 33 mgKOH / g, the softening point: 102°C.
Embodiment 3
[0045] A kind of polyester resin for powder coating with good flexibility and preparation method thereof, its raw material composition and molar ratio are:
[0046]
[0047]
[0048] Its preparation method etc. are the same as embodiment 1.
[0049] The acid value of the prepared polyester resin: 31 mgKOH / g, the softening point: 100°C.
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Abstract
The invention relates to a polyester resin for powder coating with excellent flexibility and a preparation method thereof, belonging to the technical field of powder coating chemical industry. The raw material monomers used in the polyester resin have a good linear structure, and the highly active and highly flexible dibasic acid glycidyl diacid is used as the end-capping agent to ensure the impact resistance and water boiling resistance of the final powder coating coating. At the same time, a coated board surface with excellent flexibility is obtained. The main body of the obtained polyester resin has good linear structure, low softening point, excellent flexibility and excellent bending resistance, and can be combined with high-functionality curing agent N,N,N',N'-tetrakis(β-hydroxyethyl ) to match the adipamide curing system. It improves the decorative performance and protective performance of the powder coating, especially has outstanding flexibility, and the T-bend value can reach up to 1T. The raw materials used in the preparation method are easy to obtain, the process is easy to operate, suitable for large-scale production, and widely used in decorative and protective fields such as home appliances, automobiles, and metal furniture.
Description
technical field [0001] The invention relates to a polyester resin for powder coatings with excellent flexibility and a preparation method thereof. The prepared polyester resin can be combined with a high-functionality curing agent N,N,N',N'-tetrakis(β-hydroxyethyl ) adipamide (HAA) curing system to prepare a powder coating with excellent flexibility, which belongs to the technical field of powder coating chemical industry. Background technique [0002] Unlike traditional solvent-based coatings, powder coatings are solid powders that contain neither organic solvents (VOCs) nor water, and are widely used in home appliances, automobiles, office appliances, steel and construction. Powder coatings are gradually replacing traditional solvent-based coatings due to their advantages of high inorganic content, no pollution and energy saving. With the advancement of science and technology and the development of the market, the application of powder coatings has attracted more and more...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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