Room-temperature curing high-temperature-resistant organic silicon rubber coating as well as preparations method and application of room-temperature curing high-temperature-resistant organic silicon rubber coating

A silicone rubber, room temperature curing technology, used in coatings, fire-resistant coatings, etc., can solve the problems of brittle application limitations, poor mechanical properties, loss of mechanical strength, molding process performance, etc., to simplify formula design and meet application requirements. Effect

Active Publication Date: 2019-04-09
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional resin-based thermal protective coatings, such as epoxy resin coatings and phenolic resin coatings, are often limited in application due to their brittleness.
Silicone rubber materials are preferred for high temperature resistance and high toughness thermal protection materials because of their good heat resistance, cold resistance, weather resistance, aging resistance, etc., but their mech

Method used

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  • Room-temperature curing high-temperature-resistant organic silicon rubber coating as well as preparations method and application of room-temperature curing high-temperature-resistant organic silicon rubber coating
  • Room-temperature curing high-temperature-resistant organic silicon rubber coating as well as preparations method and application of room-temperature curing high-temperature-resistant organic silicon rubber coating
  • Room-temperature curing high-temperature-resistant organic silicon rubber coating as well as preparations method and application of room-temperature curing high-temperature-resistant organic silicon rubber coating

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Experimental program
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Effect test

preparation example Construction

[0054] The preparation method of above-mentioned polysilazane, described method comprises the steps:

[0055] (1) Drying the solvent, ammonia gas, difunctional chlorosilane and trifunctional chlorosilane, and drying the reaction device;

[0056] (2) Add the dried solvent into the reaction device through a metering pump, add the dried difunctional chlorosilane and trifunctional chlorosilane into the reaction device through a metering pump respectively, and pass the dried ammonia through a mass flow meter. Enter under the liquid level of reaction device, carry out ammonolysis reaction;

[0057] (3) Put the "slurry" system containing a large amount of ammonium chloride after the reaction into the filter device through the mortar pump, filter and wash the filter residue with a solvent, and collect the filtrate;

[0058] (4) The filtrate containing the polysilazane product is introduced into a thin-film evaporator with continuous distillation function through a material transfer p...

preparation example 1

[0069] 600L of petroleum ether (boiling point 30-60°C) was dried through molecular sieves and added to a 1000L reactor through a metering pump, and 100kg of dimethyldichlorosilane and 100kg of methyltrichlorosilane were added to the reactor through the frequency control of the metering pump. Silane, start the stirring of the reactor at 5000rpm, control the temperature in the reactor at -20°C through a refrigerator, dry the ammonia gas through a molecular sieve, and then enter the reactor through mass flow meter control, and pass through 5 inlets arranged around the stirring shaft. The pores enter the reaction system in the form of microbubbles under the air pressure of 3MPa. 10kg of ceramic balls are placed in the reactor to break the ammonium chloride p-dimethyldichlorosilane and methyltrichlorosilane produced in situ. And the resulting polymethylsilazane coating. After 24 hours, no ammonia gas can be detected in the tail gas, and the reaction system stops passing ammonia. Du...

Embodiment 1

[0071] Component A of room temperature curing high temperature resistant silicone rubber thermal protective coating (the following parts represent parts by mass):

[0072] Methylpolysiloxane (the brand is 107 silicone rubber, the manufacturer is Xinghuo silicone, the viscosity is 7000cps, that is, R in the above formula (1) 1 and R 2 At the same time, 100 parts are selected from methyl), 25 parts of precipitated white carbon black (the brand is 779, the manufacturer is Fujian Zhengsheng), 6 parts of ferric oxide with micro-nano structure, and 10 parts of tin oxide with micro-nano structure , 10 parts of glass hollow microspheres with a hollow structure, 10 parts of glass fibers with a micro-nano structure, and 10 parts of cyclohexane.

[0073] The coating preparation process is as follows:

[0074] (1) Purify the used methylpolysiloxane using a molecular distillation device at a vacuum degree of 50Pa and a temperature of 140°C, and the volatile content of the purified methyl...

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Abstract

The invention provides a room-temperature curing high-temperature-resistant organic silicon rubber coating as well as a preparations method and application of the room-temperature curing high-temperature-resistant organic silicon rubber coating. The organic silicon rubber coating is prepared from an organic silicon rubber material; and the organic silicon rubber material is characterized in that amatching system of a hydroxy-terminated polysiloxane polymer containing different functional groups, modified white carbon black reinforced filler, high-temperature-resistant and antioxidant filler,high-temperature-resistant and ablation-resistant filler and fibers is designed and used and is matched with a proper polysilazane curing agent based on a mechanism of an interaction among an organicsilicon polymer chain, the reinforced filler, the high-temperature-resistant and antioxidant filler, the high-temperature-resistant and ablation-resistant filler and the fibers in order to meet the harsh requirement for excellent comprehensive performances such as room temperature curing, high temperature resistance and high mechanical properties required in the use of the high-temperature-resistant organic silicon thermal protection coating, so that the formula design of a high-temperature-resistant elastic coating is simplified, and the use of a char forming agent capable of generating hugeinfluences to the mechanical properties is reduced.

Description

technical field [0001] The invention relates to a room-temperature-cured high-temperature-resistant silicone rubber coating and a preparation method and application thereof, belonging to the technical field of high-temperature-resistant elastic materials and their preparation. Background technique [0002] With the rapid development of modern aerospace requirements, the flight speed of the required aircraft is getting faster and faster, which makes the temperature of the aircraft face higher and higher, which puts forward higher and higher requirements for high temperature resistant protective materials, such as Room temperature curing, high temperature resistance, high mechanical properties of protective materials. The traditional resin-based thermal protection coatings, such as epoxy resin coatings and phenolic resin coatings, are often limited in application due to their brittleness. Silicone rubber materials are preferred for high temperature resistance and high toughne...

Claims

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Application Information

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IPC IPC(8): C09D183/04C09D7/62C09D7/65C08G77/62
CPCC08G77/62C08K2003/2213C08K2003/2231C08K2003/2272C08K2003/2296C08L2201/08C09D5/18C09D7/62C09D7/65C09D7/70C09D183/04C08L83/16C08K13/06C08K9/10C08K9/06C08K3/36C08K3/22C08K7/28C08K7/14C08K7/26C08K7/00
Inventor 张学忠张志杰戴丽娜谭永霞汪倩赵云峰谢择民
Owner INST OF CHEM CHINESE ACAD OF SCI
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