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Flexible curing agent for fluorocarbon coating and preparation method of flexible curing agent

A technology of fluorocarbon coating and curing agent, applied in the direction of coating, etc., can solve the problems of low elongation, poor low temperature resistance, insufficient flexibility, etc., and achieve the effect of good tensile strength and good yellowing resistance

Active Publication Date: 2019-02-19
JIANGSU CHEM RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of poor low-temperature resistance, insufficient flexibility, and low elongation under high strength of coatings existing in the prior art, the present invention provides a flexible curing agent for fluorocarbon coatings and a preparation method thereof, which has the ability to improve fluorocarbon The advantages of coating tensile strength, elongation at break, and low temperature resistance

Method used

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  • Flexible curing agent for fluorocarbon coating and preparation method of flexible curing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Preparation of modified polyether polyol with low unsaturation and high molecular weight: 100 parts by weight of difunctional polyol with molecular weight of 6000-10000, 60 parts by weight of trifunctional polyol with molecular weight of 6000-10000, 20 parts by weight of Polytetrahydrofuran ether with a temperature of 2000-4000 and 3 parts by weight of aliphatic isocyanate are reacted to synthesize a modified polyether polyol with low unsaturation and high molecular weight. The reaction temperature is 80-90°C and the reaction time is 0.5-2h.

[0024] Preparation of curing agent: Put 100 parts by weight of modified polyether polyol with low unsaturation and high molecular weight and 20 parts by weight of polycarbonate diol into the reaction kettle, stir evenly, heat up to 110-120°C for 1-1.5 hours, and then Add 40 parts by weight of isophorone diisocyanate during the stirring process, and after stirring for 10 minutes, slowly add the diluted catalyst into the reaction ket...

Embodiment 2

[0026] Preparation of curing agent: Put 100 parts by weight of the modified polyether polyol with low unsaturation and high molecular weight prepared in Example 1, and 15 parts by weight of polycaprolactone diol into the reaction kettle, stir evenly, and heat up to 110-120°C Dehydration for 1-1.5 hours, then add 30 parts by weight of hexamethylene diisocyanate during the stirring process, and after stirring for 10 minutes, slowly add the diluted catalyst into the reactor according to the amount, the temperature is controlled at 90-95 °C, and the constant temperature reaction is 4- 5h, finally add ethyl acetate, stir for 0.5h, stop the reaction when the NCO reaches the set value, vacuum degassing for 0.5h, and discharge to obtain the curing agent.

Embodiment 3

[0028] Preparation of curing agent: Put 100 parts by weight of the modified polyether polyol with low unsaturation and high molecular weight prepared in Example 1, and 20 parts by weight of polycaprolactone diol into the reaction kettle, stir evenly, and heat up to 110-120°C Dehydration for 1-1.5 hours, then add 44 parts by weight of isophorone diisocyanate during the stirring process, and after stirring for 10 minutes, slowly add the diluted catalyst into the reactor according to the amount, the temperature is controlled at 90-95 °C, and the constant temperature reaction is 4- 5h, finally add xylene, stir for 0.5h, stop the reaction when NCO reaches the set value, vacuum degassing for 0.5h, and discharge to obtain the curing agent.

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Abstract

The invention provides a flexible curing gent for a fluorocarbon coating and a preparation method of the flexible curing agent, and belongs to the field of chemical coatings. The curing agent comprises the following components: modified polyether polyol with low degree of unsaturation and high molecular weight, polyester polyol, aliphatic isocyanate, a diluent and a catalyst. The preparation method of the curing agent comprises the following steps: feeding the modified polyether polyol with low degree of unsaturation and high molecular weight and the polyester polyol in a reactor at first, stirring uniformly, heating and dehydrating for a period of time, then adding the aliphatic isocyanate in a stirring process, after stirring, slowly dropwise adding the catalyst in a reactor, controllingthe temperature, reacting for a period of time at a constant temperature, finally adding the dilute, stirring uniformly, stopping reaction when NCO is detected to reach a set value, then defoaming under vacuum, and discharging to obtain the curing agent. Compared with the conventional aliphatic curing agent, the coating prepared from the curing agent and the fluorocarbon resin has good tensile strength, breaking elongation and low temperature resistance.

Description

technical field [0001] The invention belongs to the field of chemical coatings, and in particular relates to a flexible curing agent for fluorocarbon coatings and a preparation method thereof. Background technique [0002] At present, my country's high-speed railways generally use ballastless tracks, so a large number of concrete bridges are required. Concrete bridges contain a large number of steel structures, but the anti-corrosion maintenance of steel structures has become an important problem that needs to be faced in the use of ballastless tracks. Fluorocarbon coating is a kind of finish paint for steel structure anticorrosion. Because of its unique F-C bond structure, it has excellent aging resistance. However, due to its own structural characteristics and curing agent problems, the existing fluorocarbon coatings are The coating is brittle, the elongation at break of the coating is 0-50%, and the low temperature resistance is also poor. Especially in the cold weather i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D127/12C09D7/00C08G18/75C08G18/73C08G18/48C08G18/42C08G18/44
CPCC08G18/4018C08G18/4277C08G18/44C08G18/4854C08G18/73C08G18/755C09D7/00C09D127/12
Inventor 张志忠赵凯杜存山祝和权南阳王涛
Owner JIANGSU CHEM RES INST
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