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A technology of thermal insulation material and silicone resin, applied in the field of rubber compound, to achieve the effect of hard and dense carbon layer, improving the scope of application, and improving the ability of scouring external stress
Active Publication Date: 2018-03-20
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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As for other types of silicone resins, especially phenyl silicone resins and vinyl silicone resins, because of their excellent thermo-oxidative stability, cold resistance, weather resistance, electrical insulation, hydrophobicity and anti-adhesive release properties, they have been It is widely used in high and low temperature resistant insulating paints, special coatings, adhesives, molding compounds and other fields, but it is rarely reported as a filler in rubber
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Embodiment 1- Embodiment 5
[0039] Table 1 The formula and material type of embodiment 1-embodiment 5 *
[0040]
[0041] SR-1 is phenyl silicone rubber with grade 120-1; SR-2 is a phenyl silicone resin; SR-3 is a methyl silicone resin;
[0042] SR-4 is a cage-type silsesquioxane silicone resin.
[0043] (1) stocking: stocking according to the proportioning of each embodiment in table 1;
[0044] Description: The total number of fillers in Example 2-Example 5 is 169phr, respectively: EPDM, 100.0; ZnO, 3.0; SA, 1.0; vulcanizing agent, 3.0; surfactant, 3.0; tackifying resin, 10.0; Fiber, 8.0; Carbon Black (C), 5.0; SiO 2 , 10.0; smoke suppressant (MoO 3 ), 3.0; MMg, 3.0; silicone, 20.0. Embodiment 1 does not add silicone resin, and the total number of parts of material is 149phr.
[0045] (2) Mixing and sample preparation: operate according to the mixing and vulcanization process of the conventional thermal insulation layer.
[0046] (3) Performance test: Test the performance of the insulation ma...
Embodiment 6- Embodiment 9
[0052] The formula of table 3 embodiment 6-embodiment 9
[0053] (1)
[0054]
[0055] (2) stocking: stocking according to the proportioning of each embodiment in table 3;
[0056] The common basic formula of embodiment 6-embodiment 9 selects the material and proportion of embodiment 1, namely: EPDM, 100.0; ZnO, 3.0; SA, 1.0; DCP, 3.0; WD-70, 3.0; TR, 10.0; PA , 8.0; carbon black (C), 5.0; SiO 2 , 10.0; smoke suppressant (MoO 3 ), 3.0; MMg, 3.0, a total of 149phr.
[0057] (3) Mixing and sample preparation: operate according to the mixing and vulcanization process of the conventional heat insulation layer.
[0058] (4) Performance test: Test the performance of the insulation material according to the corresponding standard specifications, and the specific results are shown in Table 4.
[0059] Example 6-Example 9 adjusted the amount of two silicone resins, SR-2 and SR-4, and added an appropriate amount of magnesium salt (MMg). From the results in Table 5, it can be se...
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Abstract
A silicone resin filled EPDM thermal insulation material, its composition (parts by weight, phr) is EPDM rubber 100, silicone resin 20‑60, metal compound 3‑20, reinforcing agent 15‑20, organic fiber 8‑15 , tackifying resin 8‑12, other additives 3‑12. By adding an appropriate amount of silicone resin and metal compounds to the EPDM thermal insulation material, using its pyrolysis and reaction at high temperature, a molten silicate viscous liquid film is formed in situ, which can adhere to the surface of the cracked solid residue and pass through the liquid film. The bonding effect of the solid residue forms a solid network structure in the form of physical crosslinking, which increases the self-supporting ability of the carbonized layer of the thermal insulation layer and resists the scouring effect of external stress, and effectively improves the erosion resistance and ablation resistance of the thermal insulation material. . The invention can be widely used in manufacture of electric wire and cable materials which can be porcelained and other fields requiring fireproofing and flame retardant, besides being applicable to the rubber-type heat-insulating material of the engine.
Description
technical field [0001] The invention relates to a rubber compound filled with organosilicon polymers, in particular to a silicone-filled EPDM heat-insulating material, and at the same time relates to the effect of the silicone resin on the performance of the EPDM heat-insulated material. Background technique [0002] EPDM rubber has the advantages of low density, good weather resistance, aging resistance, heat resistance, etc., and its density is 0.86g / cm 3 Left and right, it has a large filling coefficient, and has good compatibility with various propellants and shell composite materials, and is an ideal thermal insulation material in the engine shell. At present, the commonly used EPDM insulation materials are mostly composed of organic fibers, flame retardants, tackifiers, reinforcing agents (mostly silica) and other functional additives. It is very easy to be cracked into small molecular gas by heat, and the pyrolysis carbon layer and inorganic filler remain. Since the ...
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