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Epoxy cured high-flexibility polyester resin used for powdery paint and a preparing method thereof

A polyester resin and powder coating technology, applied in powder coatings, epoxy resin coatings, polyester coatings, etc., can solve the problems of polyester resin storage stability, cracking, falling off, etc., and achieve excellent impact resistance and folding Bending ability, increased athletic ability, sufficient time effect

Active Publication Date: 2017-05-10
ZHEJIANG CHUANHUA TIANSONG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of powder coatings made of conventional polyester used on anti-theft doors are: when the thickness of the coating film is 50-90 μm, cracks will occur when the workpiece is processed by pressing, folding, rolling, and sealing. or fall off
Chinese patent CN 105367767A "saturated medium hydroxyl polyester for high flexibility powder coating and its preparation method" relates to polyester resin for high flexibility powder coating and its preparation method. The powder coating system is polyurethane powder cured by blocked isocyanate Coating system, the formulation design and process control of the polyester resin are not suitable for epoxy-cured polyester / epoxy systems
[0004] Epoxy-cured polyester / epoxy system powder coatings are generally brittle due to the large amount of epoxy resin, and it is often necessary to add special additives to improve the flexibility of polyester resins to increase the strength of powder coatings. Flexibility; however, while improving flexibility in this way, it is often difficult to balance polyester resin storage stability
[0005] At present, there is no need to add special additives, that is, epoxy-cured polyester / epoxy system high-flexibility powder coatings with excellent flexibility, and there is no public report yet

Method used

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  • Epoxy cured high-flexibility polyester resin used for powdery paint and a preparing method thereof
  • Epoxy cured high-flexibility polyester resin used for powdery paint and a preparing method thereof
  • Epoxy cured high-flexibility polyester resin used for powdery paint and a preparing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment A

[0041] Embodiment A.B.C process is: the preparation method of epoxy curing high flexibility powder coating polyester resin (the prepared polyester resin and epoxy resin prepare coating with the weight ratio of 60:40), carry out as follows:

[0042] 1) Add neopentyl glycol, 2-methylpropanediol, 3-methyl-1.5-pentanediol, and triphenyl phosphite to a reaction kettle equipped with a heating device, an agitator, and a distillation column, and raise the temperature under normal pressure To 110-130°C, then put in terephthalic acid, adipic acid and catalyst; while stirring, heat up at a rate of 2-3°C per minute;

[0043] 2) When the temperature of the material rises to 170-180°C, esterification water begins to be generated and evaporated through the distillation column; at this time, the heating rate is adjusted to 2-3°C every 30 minutes; when the temperature of the material rises to 195°C±2°C, the Control the temperature rise rate at 5-6°C every 30 minutes. When the temperature of th...

Embodiment E

[0047] Embodiment E.F.G process is: the preparation method of epoxy curing high flexibility powder coating polyester resin (the prepared polyester resin and epoxy resin prepare coating with the weight ratio of 50:50), carry out as follows:

[0048] 1) Add neopentyl glycol, 2-methylpropanediol, and 3-methyl-1.5-pentanediol into a reaction kettle equipped with a heating device, agitator and a distillation column, and raise the temperature to 110-130°C under normal pressure, Add terephthalic acid, adipic acid and catalyst; heat up at a rate of 2-3°C per minute while stirring;

[0049] 2) When the temperature of the material rises to 170-180°C, esterification water begins to be generated and evaporated through the distillation column; at this time, the heating rate is adjusted to 2-3°C every 30 minutes; when the temperature of the material rises to 195°C±2°C, the When the heating rate is adjusted to 5-6°C every 30 minutes, when the material temperature rises to 240°C±2°C, the heat...

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Abstract

The invention relates to epoxy cured high-flexibility polyester resin used for powdery paint and a preparing method thereof. The provided polyester resin has a characteristic of high flexibility. The provided method has characteristics of simple and concise steps. According to a technical scheme, the polyester resin includes neopentyl glycol, 2-methyl propanediol, and the like. The method includes steps of 1) adding the neopentyl glycol, the 2-methyl propanediol and 3-methyl-1,5-pentanediol into a reaction kettle, raising the temperature, then adding terephthalic acid, adipic acid and a catalyst and raising the temperature under stirring; 2) generating esterification water and evaporating the water to remove the water, controlling and regulating the temperature raising rate, reacting under a maintained temperature, and finishing temperature maintaining when the amount of the esterification water is 95% or above of the theoretical water discharge amount; 3) adding triphenyl phosphite, gradually vacuumizing and reacting continuously; 4) adding trimellitic anhydride and reacting under a maintained temperature; and 5) adding an antioxidant and a curing promoter, reacting under stirring and discharging a material.

Description

technical field [0001] The invention relates to the field of chemical powder coatings, in particular to a polyester resin for epoxy-cured high-flexibility powder coatings and a preparation method thereof. The prepared polyester resin can be prepared in a ratio of 60:40 or 50:50 with epoxy resin powder coating. Background technique [0002] Highly flexible powder coatings can meet the requirements of the workpiece to be painted first and then formed, such as automotive filters, springs, security doors and other workpieces. Among them, polyester resins for anti-theft door powder coatings mainly include TGIC curing and epoxy curing, and indoor anti-theft doors mainly use epoxy curing powder coatings. The disadvantages of powder coatings made of conventional polyester used on anti-theft doors are: when the thickness of the coating film is 50-90 μm, cracks will occur when the workpiece is processed by pressing, folding, rolling, and sealing. or fall off. Chinese patent CN10326...

Claims

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Application Information

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IPC IPC(8): C09D167/02C09D163/00C09D5/03C08G63/183C08K5/526C08K5/134
CPCC08G63/183C08K5/1345C08K5/526C08K2201/014C09D5/03C09D163/00C09D167/02C08L63/00C08L67/02
Inventor 廖萍邱锋利储坚刚汤明麟
Owner ZHEJIANG CHUANHUA TIANSONG NEW MATERIAL CO LTD
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