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Quick-curing polyester resin for QM1260 system high-leveling powder coating and preparation method of quick-curing polyester resin

A technology of QM1260, 1. QM1260, applied in the field of preparation of the above-mentioned polyester resin, can solve problems such as high softening point, steric hindrance of terminal carboxyl group, hard molecular segment, etc., and achieve high curing speed, good linear structure and excellent fluidity Effect

Active Publication Date: 2020-03-17
HUANGSHAN HUIZHOU KANGJIA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the problem in the above-mentioned literature is that due to the molecular structure design of the polyester resin and the four-functionality characteristic of the end-capping agent calcein, the molecular chain segment is relatively hard and the softening point is high, and the coating film after curing with QM1260 curing agent flows The flatness is relatively general, and generally can only reach level 5, and the terminal carboxyl group caused by calcein has obvious steric hindrance, and further rapid curing such as 180°C / 10min cannot be achieved
Although the polyester can achieve rapid curing at high temperature, it is suitable for TGIC curing system and not suitable for QM1260 curing system

Method used

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  • Quick-curing polyester resin for QM1260 system high-leveling powder coating and preparation method of quick-curing polyester resin
  • Quick-curing polyester resin for QM1260 system high-leveling powder coating and preparation method of quick-curing polyester resin
  • Quick-curing polyester resin for QM1260 system high-leveling powder coating and preparation method of quick-curing polyester resin

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The preparation method of QM1260 system high-leveling powder coating fast curing type polyester resin comprises the following steps:

[0049] (1) prepare the raw material of following molar quantity:

[0050] Diethylene glycol 16mol, diethanolamine 15mol, terephthalic acid 12mol, biphenyldicarboxylic acid 15mol, isophthalic acid 10mol, 1,6-hexanediol 7mol, octadecanedioic acid 9mol, monobutyltin oxide 0.1mol , antioxidant 1010 0.2mol, accelerator 0.02mol;

[0051] Add the catalyst, diethylene glycol, diethanolamine, terephthalic acid, and biphenyl dicarboxylic acid into the reactor, gradually raise the temperature to 180°C at 10°C / h, and fully esterify and polymerize at 180°C for 8 hours;

[0052] (2) When the hydroxyl value of the reactant reaches 50mgKOH / g, add isophthalic acid into the reactor to carry out sufficient esterification polymerization reaction, and slowly raise the temperature from 180°C to 220°C, and control the heating rate at 5°C / h , and insulation p...

Embodiment 6

[0077] The formulation of the general QM1260 system high leveling powder coating is usually as follows in parts by weight:

[0078]

[0079]

[0080] Paint coating preparation: Mix all materials according to the formula of QM1260 powder paint, extrude with twin-screw extruder, press into tablets, crush, and then crush and sieve the flakes to make powder paint. The powder coating is sprayed on the surface-treated aluminum plate with an electrostatic spray gun, and is rapidly cured at 180°C / 10min to obtain the powder coating.

[0081] Coating index detection is based on GB / T 21776-2008 "Powder Coatings and Coatings Testing Standard Guide"; boiling water resistance test GB 5237.4-2008 "Aluminum alloy building profiles part 4 powder sprayed profiles"; leveling level test basis According to JB-T 3998-1999 "Painting Leveling Test Method", the higher the leveling grade, the better the leveling of the coating film.

[0082] The product performance comparison of table 2 embodime...

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Abstract

The invention belongs to the field of resin for powder coatings, and particularly relates to quick-curing polyester resin for a QM1260 system high-leveling powder coating and a preparation method of the quick-curing polyester resin. The polyester resin is mainly prepared from the following raw materials in parts by mole through a polymerization reaction: 10 to 22 parts of diethylene glycol, 9 to 20 parts of diethanol amine, 7 to 18 parts of terephthalic acid, 10 to 25 parts of biphenyl dicarboxylic acid, 5 to 15 parts of isophthalic acid, 4 to 10 parts of 1,6-hexanediol and 6 to 12 parts of octadecanedioic acid. The obtained polyester resin has the advantages that a chain segment is soft; an end group is designed to take completely flexible 1,6-hexanediol and octadecanedioic acid as end capping parts, the steric hindrance is low and the reaction speed is high, overcoming of the problem of curing activity reduction caused by high steric hindrance of a QM1260 curing agent is facilitated,180 DEG C / 10 min quick curing film formation can be achieved, the coating film leveling property is good, the leveling grade reaches 7 or higher, and the film layer quality completely meets the requirements of the powder coating film.

Description

technical field [0001] The invention belongs to the field of resins used in powder coatings, and in particular relates to a fast-curing polyester resin for QM1260 system high-leveling powder coatings, and also relates to a preparation method of the polyester resin. Background technique [0002] The chemical name of QM1260 curing agent is N,N,N',N'-tetrakis(2-hydroxypropyl)adipamide, and the chemical name of HAA curing agent is N,N,N',N'-tetrakis(2-hydroxyethyl) base) adipamide, because both the QM1260 curing agent and the HAA curing agent belong to the β-hydroxyalkylamide curing agent, compared with the HAA curing agent, the QM1260 curing agent has excellent anti-yellowing performance, but its terminal group has a larger steric hindrance , the reaction rate with polyester resin is slow, the polyester resin currently used is mostly the same as the polyester resin used in HAA system, without distinction, it takes a long time (180°C / 20min) to fully cure, and the HAA curing syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/685C08G63/85C09D167/02C09D5/03
CPCC08G63/6856C08G63/85C09D167/02C09D5/03
Inventor 周勇吴泽凯洪昭武汪利华谭卫东李海云
Owner HUANGSHAN HUIZHOU KANGJIA CHEM CO LTD
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