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A kind of oxygen barrier coating and preparation method thereof

An oxygen barrier and coating technology, applied in the field of materials, can solve the problems of inorganic coating cracking and peeling, inorganic coating cracking, large roughness, etc., and achieve the effect of avoiding cracking and peeling, excellent adhesion, and blocking erosion.

Active Publication Date: 2022-07-29
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, polymers or polymer-based composites with high thermal expansion coefficients will undergo large deformation after being subjected to high and low temperature impacts, which will lead to cracking and peeling off of inorganic coatings with low thermal expansion coefficients.
In addition, the surface of polymer-based composite materials is generally rough, and a thicker protective layer is required to achieve the effect of blocking atomic oxygen, which makes the inorganic coating more prone to cracking and falling off.

Method used

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  • A kind of oxygen barrier coating and preparation method thereof
  • A kind of oxygen barrier coating and preparation method thereof
  • A kind of oxygen barrier coating and preparation method thereof

Examples

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Effect test

preparation example 1

[0094] Preparation Example 1 Preparation of Polysilazane

[0095] Synthesis of polysilazane A: use a 1000mL three-necked glass flask as a reaction vessel, assemble mechanical stirring, rotate at 400 rpm, first replace the air in the reaction flask with nitrogen three times, make the reaction vessel a nitrogen atmosphere, add 500mL of solvent toluene , the temperature in the reaction flask was lowered to -10°C. join (CH 3 ) 2 SiCl 2 64.5g (0.5mol) and CH 3 (CH=CH 2 )SiCl 2 141g (1mol), after stirring for 20min, start to feed raw ammonia gas, the feed rate is 40mL / min, the ammonia gas is 0.77g / L under normal pressure, equivalent to a total of 84g (5mol), and the system is maintained during the process of passing ammonia. The temperature was -10°C. After the ammonia passing was completed, the stirring reaction was continued for 4 hours. After the reaction product was static for 6 hours, it was filtered with a 0.1 micron membrane filter, and the filtrate was further conc...

preparation example 2

[0097] Preparation Example 2 Preparation of Polysilazane

[0098] Synthesis of polysilazane B: using a 1000mL three-necked glass flask as a reaction vessel, equipped with mechanical stirring, rotating at 400 rev / min, first replacing the air in the reaction flask with nitrogen three times, making the reaction vessel a nitrogen atmosphere, adding the solvent xylene 500mL, and the temperature in the reaction flask was lowered to -10°C. join (CH 3 ) 2 SiCl 2 77.4g (0.6mol) and CH 3 SiHCl 2 115g (1mol), after stirring for 20min, start feeding raw ammonia gas, feeding rate is 40mL / min, ammonia gas is 0.77g / L under normal pressure state, equivalent to feeding 84g (5mol) in total, keep the system during the ammonia feeding process The temperature was -10°C. After the ammonia passing was completed, the stirring reaction was continued for 4 hours. After the reaction product was static for 6 hours, 0.1 micron membrane was used for filtration, and the filtrate was further concent...

preparation example 3

[0100] Preparation Example 3 Preparation of Polysilazane

[0101] Synthesis of polysilazane C: use a 1000mL three-necked glass flask as a reaction vessel, assemble mechanical stirring, rotate at 400 rpm, first replace the air in the reaction flask with nitrogen three times, make the reaction vessel a nitrogen atmosphere, add the solvent xylene 500mL, and the temperature in the reaction flask was lowered to -20°C. join H 2 SiCl 2 101g (1mol) and CH 3 SiHCl 2 115g (1mol), after stirring for 20min, start feeding raw ammonia gas, the feeding rate is 40mL / min, the ammonia gas is 0.77g / L under normal pressure, equivalent to 102g (6mol), and the system is maintained during the ammonia feeding process The temperature is -20°C. After the ammonia passing was completed, the stirring reaction was continued for 4 hours. After the reaction product was static for 6 hours, it was filtered with a 0.1 micron membrane filter, and the filtrate was further concentrated under vacuum heating...

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Abstract

The invention belongs to the technical field of materials, and in particular relates to an oxygen barrier coating and a preparation method and application thereof. The oxygen barrier coating of the present invention includes an undercoat layer, a buffer layer and a topcoat layer. The undercoat layer plays the role of increasing adhesion, the buffer layer can adjust the thermal expansion coefficient of the coating layer, and the topcoat layer can effectively block oxygen, especially atomic oxygen. The coating is prepared based on liquid polysilazane, and the coating method is flexible; the cured coating is an organic-inorganic hybrid coating, and the main component is silicon oxide. When the atomic oxygen flux is 5.2x10 21 atoms / cm 2 When the coating-protected polymer material has a peeling rate of only 0.015 mg / cm 2 . From the base coat to the buffer layer to the top coat, there is an increasing gradient of inorganic components in the chemical structure, and the thermal expansion coefficient can be adjusted, which is suitable for materials with a large thermal expansion coefficient.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to an oxygen barrier coating and a preparation method thereof. Background technique [0002] The development of long-life, lightweight aerospace vehicles has made polymers and polymer-based composites widely used in spacecraft solar cell arrays, solar sails, sun visors, and docking system insulators. In the low-Earth orbit environment, most of the oxygen is dissociated into atomic oxygen with extremely high oxidative activity by ultraviolet light, and its oxidative corrosion causes the decomposition and strength reduction of space polymer materials. By applying a coating material on the surface of the polymer material, oxygen, especially atomic oxygen, can be effectively blocked, thereby improving the service life of the polymer material. Coating materials can be divided into organic protective coatings and inorganic protective coatings. Among them, organic coatings ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/16C09D7/61C09D5/00C08J7/048C08G77/62
CPCC09D183/16C09D7/61C09D5/002C08J7/042C08G77/62C08K2003/2227C08J2367/02C08J2361/16C08J2379/08C08L2201/14C08K3/36C08K3/22C08K3/34C08K5/17
Inventor 张宗波王丹徐彩虹黄文文
Owner INST OF CHEM CHINESE ACAD OF SCI
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