A kind of epoxidized polyester resin, its preparation method and powder coating composition containing it

A technology for epoxidizing polyester and polyester resin, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of less epoxy, high formula cost, and corrosion cost of metal substrates, and achieve leveling Good water resistance, excellent boiling performance and weather resistance, high gloss effect

Active Publication Date: 2019-01-04
HUANGSHAN HUIZHOU KANGJIA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional polyester resins for powder coatings are all carboxyl polyester resins as disclosed in CN101560291A or hydroxyl polyester resins as disclosed in CN106519204A, which cannot realize the self-curing of the polyester system
For the curing of indoor powder coatings, it is necessary to use E-12 epoxy resin and carboxyl polyester resin together, which has the following disadvantages: (1) E-12 epoxy resin synthesis process uses epichlorohydrin and sodium hydroxide, The final E-12 epoxy resin contains a certain amount of sodium chloride and sodium hydroxide, which has a certain impact on the water boiling resistance of the final powder coating, and the presence of chloride ions also has a certain corrosion effect on the metal substrate (2 ) The cost of E-12 epoxy resin itself is higher than that of polyester. At the same time, because the epoxy equivalent of E-12 epoxy resin is 800-850g / eq, the number of epoxy is small, and the amount used in the powder formulation is relatively large, resulting in the formulation higher cost

Method used

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  • A kind of epoxidized polyester resin, its preparation method and powder coating composition containing it
  • A kind of epoxidized polyester resin, its preparation method and powder coating composition containing it
  • A kind of epoxidized polyester resin, its preparation method and powder coating composition containing it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] A kind of epoxidized polyester resin, the main raw material and molar proportion of preparing hydroxyl-terminated polyester resin are:

[0081] 8 mol of terephthalic acid, 10 mol of fumaric acid, 9 mol of dodecenyl succinic acid, 12 mol of ricinoleic acid, 10 mol of 1,2,4-cyclohexanetricarboxylate monopropenyl with alkenyl, 8 mol of neopentyl glycol , 2-butyl-2-ethyl-1,3-propanediol 25mol, 1,1-cyclopentanedimethanol 15mol, 4-pentenol 3mol;

[0082] The reaction catalyst is samarium oxide, and the consumption is 0.1mol;

[0083] The polymerization inhibitor is hydroquinone, and the consumption is 0.02mol;

[0084] Then, the obtained hydroxyl-terminated polyester resin is prepared in the following ratio to obtain epoxidized polyester resin:

[0085] Hydroxyl-terminated polyester 35mol

[0086] Hydrogen peroxide 65mol

[0087] The epoxidation reaction catalyst is phosphotungstic acid, and the dosage is 0.5mol.

[0088] The preparation method of epoxidized polyester re...

Embodiment 2

[0094] Same as Example 1, except for the following differences:

[0095] The main raw materials and molar proportions for preparing hydroxyl-terminated polyester resin are:

[0096] 20 mol of terephthalic acid, 5 mol of fumaric acid, 6 mol of dodecenylsuccinic acid, 5 mol of ricinoleic acid, 23 mol of 1,2,4-cyclohexanetricarboxylate monopropenyl with alkenyl, 5 mol of neopentyl glycol , 2-butyl-2-ethyl-1,3-propanediol 20mol, 1,1-cyclopentanedimethanol 10mol, 4-pentenol 6mol;

[0097] The reaction catalyst is samarium oxide, and the consumption is 0.1mol;

[0098] The polymerization inhibitor is hydroquinone, and the consumption is 0.02mol;

[0099] Then, the obtained hydroxyl-terminated polyester resin is prepared in the following ratio to obtain epoxidized polyester resin:

[0100] Hydroxy terminated polyester 20mol

[0101] Hydrogen peroxide 80mol

[0102] The epoxidation reaction catalyst is phosphotungstic acid, and the dosage is 0.5 mol.

Embodiment 3

[0104] Same as Example 1, except for the following differences:

[0105] The main raw materials and molar proportions for preparing hydroxyl-terminated polyester resin are:

[0106] 10 mol of terephthalic acid, 10 mol of fumaric acid, 10 mol of dodecenyl succinic acid, 5 mol of ricinoleic acid, 10 mol of 1,2,4-cyclohexanetricarboxylate monopropenyl with alkenyl, 10 mol of neopentyl glycol , 2-butyl-2-ethyl-1,3-propanediol 30mol, 1,1-cyclopentanedimethanol 10mol, 4-pentenol 5mol;

[0107] The reaction catalyst is samarium oxide, and the consumption is 0.1mol;

[0108] The polymerization inhibitor is hydroquinone, and the consumption is 0.02mol;

[0109] Then, the obtained hydroxyl-terminated polyester resin is prepared in the following ratio to obtain epoxidized polyester resin:

[0110] Hydroxy terminated polyester 70mol

[0111] Hydrogen peroxide 30mol

[0112] The epoxidation reaction catalyst is phosphotungstic acid, and the dosage is 0.5 mol.

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Abstract

The invention discloses epoxy polyester resin, an epoxy polyester resin preparation method and a powder coating composition with the epoxy polyester resin. The epoxy polyester resin is prepared by steps: polymerizing main materials including terephthalic acid, fumaric acid, dodecenylsuccinic acid, ricinoleic acid, neopentyl glycol, 1,2,4-cyclohexane monoallyl tricarboxylate, 4-pentenol and the like, and subjecting a polymer to epoxidation reaction under the action of an oxidant. The epoxy polyester resin is capable of completely substituting E-12 epoxy resin for curing with commercially available 5:5 high-acid-value carboxyl polyester, and low consumption and low cost are realized.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to an epoxidized polyester resin, a preparation method thereof and a powder coating composition containing the same. Background technique [0002] Powder coating is a new type of solvent-free 100% solid powder coating. Powder coating is a completely different form from general coatings, and it exists in the state of fine powder. Because no solvent is used, it is called powder coating. Powder coating has the characteristics of solvent-free, pollution-free, recyclable, environmental protection, energy and resource saving, labor intensity reduction and high mechanical strength of the coating film. [0003] There are two types of powder coatings: thermoplastic powder coatings and thermosetting powder coatings. Thermoplastic powder coatings are composed of thermoplastic resins, pigments, fillers, plasticizers and stabilizers. Thermoplastic powder coatings include: polyet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/553C08G63/84C09D167/00C09D167/06C09D5/03
CPCC08G63/553C08G63/84C09D5/03C09D167/00C09D167/06C08L67/06
Inventor 周勇谭卫东汪利华吴泽凯洪昭武郑南平
Owner HUANGSHAN HUIZHOU KANGJIA CHEM CO LTD
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