Fireproof heat-insulation silicon rubber and preparation method thereof
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A technology of silicone rubber and additives, which is applied in the field of fire-proof and heat-insulating silicone rubber and its preparation
Active Publication Date: 2015-08-05
NORTHWEST RUBBER & PLASTIC RES & DESIGN INST CO LTD
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[0003] Compared with traditional nitrile rubber, neoprene, and EPDM, silicone rubber ablation-resistant materials have obvious advantages in heat resistance, ablation resistance, and smoke generation; the working time of supersonic missile ramjet More than 300S, traditional thermal insulation materials are difficult to meet the environmental requirements of its working conditions, and silicone rubber ablation-resistant materials can solve the problem of long-term thermal protection of the afterburner of ramjet engines
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preparation example Construction
[0064] A preparation method of fireproof and heat-insulating silicone rubber, comprising the following steps:
[0065] Step 1: Use a double-roll mill to adjust the roller distance to 3-5mm, and add the base material at a certain roller temperature;
[0066] Step 2: Add reinforcing agent, other additives, flame retardant and high-temperature-resistant functional fillers to the double-roller mill in sequence, mix and heat-treat after mixing;
[0067] Step 3: After the heat treatment is completed, after the temperature drops to room temperature, add other additives in the double-roll mill, and thin the film through multiple times;
[0068] Step 4: After the lower piece is parked for 24 hours, vulcanize it with a flat vulcanizing machine to make a fire-proof and heat-insulating silicone rubber sample.
[0069] The substrate in step 1 is 100 parts of phenyl silicone rubber;
[0070]The reinforcing agent in step 2 is 30 parts of meteorological silica; Described other additives a...
Embodiment
[0077] Using a double-roll mill, adjust the roll distance to 3-5 mm, add 100 grams of phenyl silicone rubber at a temperature of 0-50 ° C, then add 30 grams of meteorological white carbon black, diphenylsilanediol 4 grams, 10 grams of melamine polyphosphate, 30 grams of aluminum hydroxide, 12 grams of silicon carbide, and 10 grams of boron nitride, mixed for 20 minutes and then heat treated at 200°C for 1 hour. After the heat treatment is completed, wait until the temperature drops to room temperature , add 1 gram of vulcanizing agent dicumyl peroxide to the open mill, thin pass 3 times and take off the tablet; after parking for 24 hours, vulcanize with a flat vulcanizer at 10MPa, 160°C for 10 minutes to make a test sample.
[0078] The fire-proof test of the fire-proof and heat-insulating silicone rubber sample prepared by the above method is as follows:
[0079] 1. 3000K ablation test
[0080] ⑴. Test condition: 3000K×20s
[0081] ⑵. Test method: GJB323A-96
[0082] ⑶. ...
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Abstract
The invention discloses a fireproof heat-insulation silicon rubber and a preparation method thereof. The fireproof heat-insulation silicon rubber comprises the following components in percentage by mass: 45-55% of substrate, 10-15% of high-temperature-resistant functional filler, 15-25% of flame retardant, 10-20% of reinforcing agent and 1-5% of other assistants, totaling 100%. The preparation method of the fireproof heat-insulation silicon rubber comprises four steps. The invention provides a silicon rubber material with excellent fireproof and heat-insulation properties, which is prepared by compounding the high-temperature-resistant functional material, flame-retardant material, reinforcing material and other assistants according to the optimized formula. The fireproof heat-insulation silicon rubber is especially suitable for fireproof heat-insulation requirements of rocket engines and potential fire region working condition requirements of airplanes.
Description
technical field [0001] The invention belongs to the field of silicone rubber composite materials, and in particular relates to a fire-proof and heat-insulating silicone rubber and a preparation method thereof. Background technique [0002] Silicone rubber is a polymer elastic material with both inorganic and organic molecular chains. Its molecular main chain is composed of silicon atoms and oxygen atoms alternately (-Si-O-Si-), and the bond energy of silicon-oxygen bonds is as high as 370kj. / mol, has high thermal stability, and can reach 300°C in a short time. Introduce methyl, vinyl and diphenylsilane chain links into the main chain of the silicone rubber molecule, that is, phenyl silicone rubber. In addition to the high temperature and aging resistance of silicone rubber, it also has radiation resistance and ablation resistance. performance. [0003] Compared with traditional nitrile rubber, neoprene, and EPDM, silicone rubber ablation-resistant materials have obvious a...
Claims
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