Low-characteristic-signal combustion restricting layer and preparation method
A characteristic signal and flame-limiting technology, applied in coatings, fire-resistant coatings, etc., can solve problems such as poor flow and leveling
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Embodiment 1
[0035] The weight parts of the formula composition are: 107 glue (5000c.p.), 100 parts; MOS, 3 parts; SiO 2 , 15 parts; Cr 2 o 3 , 3 parts; KH560, 0.5 parts. Add materials according to the above ratio and mix. After mixing evenly, degassing treatment is carried out in a degassing tank with a vacuum degree of not less than 0.5kPa. The degassing time is 30±5min. The degassed slurry is ready for use.
[0036] (1) Mechanical property test
[0037] Put the slurry after vacuum defoaming into the mold, and cure it at 20°C for 14 days. After the film sample is prepared, the mechanical properties of the body are tested. The test standard is the unidirectional tensile test method of solid rocket motor combustion chamber, heat insulation layer, and lining material. Q / Gt 335-2008 (the same below), the specific test conditions are 20°C, the pulling speed is 100mm / min, the tensile degree is 1.93MPa, and the elongation at break is 313.3%.
[0038] (2) Adhesive strength test
[0039] Pre...
Embodiment 2
[0041] The weight parts of the formula composition are: 107 glue (2000c.p.), 100 parts; VOS, 3 parts; SiO 2 , 8 parts; Fe 2 o 3 , 6 parts; KH550, 2 parts. Add materials according to the above ratio and mix. After mixing evenly, degassing treatment is carried out in a degassing tank with a vacuum degree of not less than 0.5kPa. The degassing time is 30±5min. The degassed slurry is ready for use.
[0042] After preparing samples of the film cured at 50°C for 3 days, the bulk mechanical properties were tested. The test conditions were 20°C, the pulling speed was 100mm / min, the tensile degree was 1.33MPa, and the elongation at break was 210.2%.
[0043] Prepare a joint bonded specimen of steel, silicone rubber and NEPE propellant, cure it at 50°C for 3 days, and test the joint bond strength of the specimen. The test condition is 20°C and the pulling speed is 20mm / min. Experimental results show that the bonding strength is 0.71MPa.
Embodiment 3
[0045] The weight parts of the formula composition are: 107 glue (10000c.p.), 100 parts; OOS, 2 parts; SiO 2 , 10 parts; MA, 10 parts; Mg(OH) 2 , 10 parts; WD-53, 1 part. Add materials according to the above ratio and mix. After mixing evenly, degassing treatment is carried out in a degassing tank with a vacuum degree of not less than 0.5kPa. The degassing time is 30±5min. The degassed slurry is ready for use.
[0046] After sample preparation of the film cured at 60°C for 3 days, the bulk mechanical performance test was carried out. The test condition was 20°C, the pulling speed was 100mm / min, the tensile degree was 1.59MPa, and the elongation at break was 433.1%.
[0047] A joint bonded specimen of steel, silicone rubber, and HTPB propellant was prepared, cured at 60°C for 3 days, and the joint bond strength of the specimen was tested at 20°C and a pulling speed of 20mm / min. Experimental results show that its bonding strength is 0.66MPa.
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