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High-elasticity polyurethane modified epoxy-silicone ablation resistance paint

A technology for modification of epoxy silicone and polyurethane, applied in polyurea/polyurethane coatings, coatings, etc. Process and other issues, to meet the needs of ablation, excellent thermal stability, and reduce production costs

Inactive Publication Date: 2014-04-16
中昊北方涂料工业研究设计院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) EPDM rubber itself has low polarity, poor self-adhesive and mutual-adhesive properties. When making ablative coatings, tackifying resins or other rubbers are added to improve bonding properties. The substrate needs to be treated with a coupling agent. , otherwise the bonding strength will not meet the requirements of use, increasing the process
[0006] (2) The carbonization and ablation performance of EPDM rubber is limited, and it is generally necessary to add a large amount of high carbonation resin such as phenolic resin to improve the ablation performance
[0007] (3) The elasticity of EPDM rubber is average, and it is necessary to add reinforcing fibers to improve the elongation at break and other properties. After making ablative coatings, the elongation at break is not more than 10%, and the applicability is slightly poor
[0008] There are many literatures and patents about polyurethane modified epoxy resin ablation-resistant coatings, but polyurethane modified epoxy silicone ablation-resistant coatings have not been reported

Method used

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  • High-elasticity polyurethane modified epoxy-silicone ablation resistance paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 240g of phenyltriethoxysilane and 544g of diphenyldiethoxysilane into the three-necked reaction flask, start stirring, and evenly drop 21g of water into the reaction flask with a dropping funnel, and control the reaction temperature at 38°C for about 1h The dropwise addition is complete. Keep warm for 0.5h. Heat up to 80°C. The ethanol produced by the reaction reaches 88g. It takes 1.5h to raise the temperature to 133°C. After 1.5h, the amount of ethanol collected is 108g, and the temperature is lowered to 60°C. The ethoxy content is 30.3%, and the refractive index D20 is obtained: 1.512 silicone intermediates. Put 697g of organosilicon intermediate, 1162g of cyclohexanone, 581g of xylene, and 1046g of E-20 epoxy resin into a three-necked reaction flask in sequence, slowly raise the temperature, pass CO2 gas and turn on cooling water to cool, and raise the temperature to 160°C. After 6 hours of heat preservation, samples were taken to measure the gel time of the re...

Embodiment 2

[0046] Add 240g of phenyltriethoxysilane and 440g of phenylmethyldiethoxysilane into the three-necked reaction flask, start stirring, and evenly drop 31g of water into the reaction flask with a dropping funnel, control the reaction temperature at 38°C, about 1h dropwise addition is complete. Keep warm for 0.5h, heat up to 80°C, the ethanol produced by the reaction reaches 130g, take 1.5h to heat up to 133°C, collect 158g of ethanol after 2h, cool down to 60°C, and obtain ethoxy content of 30.3%, refractive index D20: 1.512 Silicone intermediates. Put 553g of organosilicon intermediate, 939g of cyclohexanone, 444g of xylene, and 830g of E-20 epoxy resin into a three-necked reaction bottle in sequence, slowly raise the temperature, pass CO2 gas and turn on cooling water to cool, and raise the temperature to 160°C. After 5.5 hours of heat preservation, samples were taken to measure the gelation time of the resin. When the gelation time was 2 minutes at 250 ° C, the temperature w...

Embodiment 3

[0056] Add 240g of phenyltriethoxysilane and 297g of dimethyldiethoxysilane into the three-necked reaction flask, start stirring, and evenly drop 40.8g of water into the reaction flask with a dropping funnel, and control the reaction temperature at 37°C for about 1h The dropwise addition is complete. Insulate for 0.5h. Heat up to 80°C. The ethanol produced by the reaction reaches 170g. It takes 1.5h to raise the temperature to 133°C. After 2h, the amount of ethanol collected is 206g, and the temperature is lowered to 60°C. The ethoxy content is 30.1%, and the refractive index D20: 1.511 Silicone intermediates. Put 372g of organosilicon intermediate, 613g of cyclohexanone, 307g of xylene, and 552g of E-20 epoxy resin into a three-necked reaction bottle in sequence, slowly raise the temperature, pass CO2 gas and turn on cooling water to cool, and raise the temperature to 160°C. After 6 hours of heat preservation, samples were taken to measure the gel time of the resin. When the...

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Abstract

The invention discloses high-elasticity polyurethane modified epoxy-silicone ablation resistance paint. According to the invention, an organic silicon intermediate prepared through alkoxy silane hydrolysis and epoxy resin are condensed into hydroxyl-terminated epoxy-silicone resin with high char yield and excellent ablation resistance; the elongation at break and the tensile strength of the resin system are improved through selecting high-elasticity polyurethane resin to toughen the epoxy-silicone resin; filler, a reinforcing agent, a thermal insulation material, an additive and a solvent are also added, so as to obtain the high-elasticity polyurethane modified epoxy-silicone ablation resistance paint. While the requirement that an outer shell coating is subjected to relatively large deformation due to internal pressure when grains are burnt is met, the coating has excellent ablativity, very low density and high thermal insulation performance.

Description

technical field [0001] The invention belongs to the technical field of coating compositions. Background technique [0002] When the flight speed of the rocket is above Mach 5, due to the blockage and friction of the atmosphere, serious surface aerodynamic heating will occur, causing the surface temperature of the rocket to rise above 1000°C. Therefore, it is necessary to provide thermal protection for the rocket to avoid the rocket's flight fail. Ablation coatings use their own phase change heat absorption and mass exchange to achieve the purpose of heat protection. Due to their high heat protection efficiency, reliable operation, and strong ability to adapt to changes in the flow field, they are widely used in the thermal protection of rocket shells. In addition to meeting the requirements of ablation performance, ablation coatings also have the following requirements: in order to improve the rocket’s carrying efficiency, reduce weight, reduce launch costs, and save fuel, ...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D7/12C09D5/00C08G77/388
Inventor 陈玉滨吴津城魏超王波孟军锋
Owner 中昊北方涂料工业研究设计院有限公司
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