Rubber thermal protection material and preparation method thereof
A heat protection material and rubber technology, applied in the field of composite materials, can solve the problems of poor ablation resistance, poor heat insulation performance, poor mechanical properties of EPDM rubber, etc., achieve simple components and improve ablation resistance , the effect of small density
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[0025] The present invention further provides a preparation method of any of the above-mentioned rubber thermal protection materials. In one embodiment, the preparation method at least comprises the following steps:
[0026] Step (1), weigh each component according to the designed ratio, mix EPDM rubber, phenolic fiber and flame retardant evenly, under stirring conditions, mix at 20-60 ℃ temperature for 15-20min, add vulcanization agent, thin pass, sheet out, get mixed rubber;
[0027] In step (2), the mixed rubber is placed for 16-24 hours and then vulcanized to finally obtain the rubber thermal protection material.
[0028] The above preparation method is further explained below:
[0029] Preferably, in step (1), the stirring speed is 50-70r / min, and the number of thin passes is 5-8 times.
[0030] Specifically, the step (2) is placed for 16-24 h so that various components (especially phenolic fibers, flame retardants) can fully function with the raw rubber.
[0031] Pre...
Embodiment 1
[0035] A rubber thermal protection material, comprising the following raw material components in parts by weight: 15 parts of phenolic fibers (3 mm in length), 100 parts of EPDM rubber, 2 parts of black phosphorene, 7 parts of ammonium polyphosphate, and 1 part of vulcanizing agent share.
[0036] Preparation process: (1) Weigh phenolic fiber, EPDM rubber, black phosphorene and ammonium polyphosphate in proportion, mix EPDM rubber, phenolic fiber, black phosphorene and ammonium polyphosphate evenly, and the stirring speed is After mixing at 50r / min and 30℃ for 15min, add a vulcanizing agent, and after thinning for 8 times, produce a sheet to obtain a mixed rubber. (2) The mixed rubber was placed for 16 hours and then vulcanized, the vulcanization temperature was 160°C, and the vulcanization pressure was 15MPa, and finally the thermal protection material 1 was obtained.
Embodiment 2
[0038] A rubber thermal protection material, comprising the following raw material components in parts by weight: 10 parts of phenolic fibers (3 mm in length), 100 parts of EPDM rubber, 2 parts of black phosphorene, 6 parts of melamine borate, and a vulcanizing agent 0.6 servings.
[0039] Preparation process: (1) Weigh phenolic fiber, black phosphorene, melamine borate and EPDM rubber in proportion, mix EPDM rubber, phenolic fiber, melamine borate and black phosphorene evenly, stir The rotating speed is 60 r / min, the vulcanizing agent is added after mixing at 50 °C for 15 minutes, and the sheet is produced after thinning for 5 times to obtain a mixed rubber. (2) The mixed rubber was placed for 24 hours and then vulcanized. The vulcanization temperature was 170°C and the vulcanization pressure was 20MPa, and finally the thermal protection material 2 was obtained.
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