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Film-forming agent for high-temperature-resistant coating as well as preparation method and application of film-forming agent

A high-temperature-resistant coating and film-forming agent technology, applied in the field of coatings, can solve problems such as poor performance and long process flow, achieve good smoothness and lubricity, simple process, and improve production efficiency

Inactive Publication Date: 2021-03-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a high-temperature-resistant paint film-forming agent, its preparation method and application, to solve the problems such as long process flow or poor performance in the preparation of PA1 film-forming agent in the prior art

Method used

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  • Film-forming agent for high-temperature-resistant coating as well as preparation method and application of film-forming agent
  • Film-forming agent for high-temperature-resistant coating as well as preparation method and application of film-forming agent

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preparation example Construction

[0018] As described in the background technology section, the preparation of PA1 film-forming agent in the prior art has the problem of long process flow or poor performance. In order to solve this problem, the invention provides a kind of preparation method of high-temperature-resistant paint film-forming agent, it is characterized in that, comprising: aromatic polyanhydride and 4,4-diphenylmethane diisocyanate (MDI) in molar ratio 1: 0.5-2 The polymerization reaction is carried out in a solvent, and the reaction temperature is 120-200° C., and the reaction time is 1-4 hours to obtain a high-temperature-resistant coating film-forming agent.

[0019] The process of the above method is simple, the thermal stability of the film-forming agent is good, and it is applied to the inner layer coating of the compound plastic pipe extruder mold. It has compatibility and uniformity with tetrafluoroethylene powder and other additives, and the film-forming effect is good. Adhesion to the m...

Embodiment 1

[0041] Select pyromellitic anhydride (PMDA) and MDI equimolar to react, solvent DMAc dosage is 2.3 times (7:3) of raw material gross weight, reaction temperature 160 ℃, reaction time 3h, intrinsic viscosity lnη of product r / C is 0.26dL / g, the temperature is as high as 485°C when the mass loss of PAI coating is 10%, and the mass loss is at least 30.1% at 800°C. The adhesion of the compound high temperature resistant coating is 6.33N / cm 2 , The maximum operating temperature is 245°C, and there will be film release after 48 hours (230°C, 20Kg / cm 2 ).

Embodiment 2

[0043] Use pyromellitic anhydride (PMDA) and MDI equimolar to react, solvent DMAc consumption is 2 times (2:1) of raw material gross weight, reaction temperature 170 ℃, reaction time 2.5h, intrinsic viscosity lnη of the product r / C is 0.29dL / g, the temperature is 505°C when the mass loss of PAI coating is 10%, and the mass loss is 28.3% at 800°C. The adhesion of the compound high temperature resistant coating is 7.49N / cm 2 , The maximum operating temperature is 260°C, and there will be film release after 60 hours (230°C, 20Kg / cm 2 ).

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Abstract

The invention provides a film-forming agent for a high-temperature-resistant coating as well as a preparation method and application of the film-forming agent. The method comprises the step that aromatic polyanhydride and 4,4-diphenylmethane diisocyanate in a molar ratio of 1: (0.5-2) are subjected to a polymerization reaction in a solvent at a reaction temperature of 120-200 DEG C for 1-4 h so asto obtain the film-forming agent for the high-temperature-resistant coating. The method is simple in process; and the film-forming agent is good in thermal stability, is applied to the inner-layer coating of a compound plastic pipe extruder die, has good uniform intermiscibility with tetrafluoroethylene powder and other additives, shows good film-forming effect, improves the adhesion between thecoating and the metal surface of the extruder die, allows the surface of the extruder die to keep good smoothness and lubricity at a high temperature (230-280 DEG C) and high extrusion strength (20 Kg / cm<2>), prolongs the complete adhesion time of the coating on the metal surface of the extruder die, decreases the replacement frequency of the extruder die and improves production efficiency.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a film-forming agent for high-temperature resistant coatings, a preparation method and application thereof. Background technique [0002] The heat resistance of current polymer coatings (mainly represented by heat resistance and thermal stability) is generally poor. At high temperature (> 150°C), some polymer materials will lose their original mechanical strength and deform or start to decompose in the air. This makes the adhesion between the paint and the carrier drop rapidly at high temperatures, resulting in film stripping and paint falling off. At present, the research hotspots of heat-resistant polymer materials mainly focus on: aromatic ring polymers, heterocyclic polymers, ladder polymers, elemental organic polymers and inorganic polymers, among which aromatic heterocyclic heat-resistant polymer materials The fastest growing, two types of polymers, polyimide and aromatic polya...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/65C08G73/10C09D127/18C09D7/61
CPCC09D7/65C08G73/1035C09D127/18C09D5/18C09D7/61C08L2201/08
Inventor 张利粉徐铁军王健王永年张卫东刘红宇许绍东黄荣福郭洪元齐峰王跃东吕明贺李政钟庆志
Owner PETROCHINA CO LTD