Non-cohesive high temperature resistant organic silicon sealant and preparation method thereof
A sealant and silicone technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of removal, difficult sealant, high sealing pressure only reaching 2.5M, etc., to achieve simple process characteristics, improve brittleness, strengthen The effect of toughness
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Embodiment 1
[0023] Embodiment 1, preparation organosilicon sealant
[0024] 1. Preparation of polysilazane
[0025] First add a certain amount of toluene as the solvent in the three-necked flask, and then add the chlorosilane mixture, which is composed of methylhydrogendichlorosilane, methylvinyldichlorosilane and diphenyldichlorosilane, and the moles of the three The ratio is 2:1:0.5, the volume ratio of solvent to chlorosilane mixture is 3:1, NH 3 , to NH 3 No more absorption (there is a bubbling gas after the reaction device, if the ammonia gas is no longer absorbed, the ammonia gas passed through will escape through the bubbler), reduce the NH 3 The speed of feeding was continued for 1 hour, the reaction was stopped, the ammonium chloride was removed by filtration, and the solvent toluene was washed 3 times, and the solvent and oligomers were removed by a reduced pressure method, and the obtained liquid was polysilazane. The prepared polysilazane has a number average molecular weig...
Embodiment 2
[0034] Embodiment 2, preparation organosilicon sealant
[0035] 1. Preparation of polysilazane
[0036] First add a certain amount of toluene as the solvent in the three-necked flask, and then add the chlorosilane mixture. The chlorosilane mixture is composed of dimethyldichlorosilane, methylvinyldichlorosilane and diphenyldichlorosilane. The moles of the three The ratio is 1:2:0.5, and the volume ratio of the solvent to the chlorosilane mixture is 4:1. Stir and feed NH at 20°C 3 , to NH 3 no longer absorbed, lowering NH 3 The speed of feeding was continued for 2 hours, the reaction was stopped, the ammonium chloride was removed by filtration, and the solvent toluene was washed 3 times, and the solvent and oligomers were removed by a decompression method, and the obtained liquid was polysilazane. The prepared polysilazane has a number average molecular weight of 740 and a viscosity of 4500cp.
[0037] 2. Preparation of silicone sealant
[0038] According to the ratio of e...
Embodiment 3
[0045] Embodiment 3, preparation organosilicon sealant
[0046] 1. To prepare polysilazane, first add a certain amount of toluene as a solvent in a three-necked flask, and then add a chlorosilane mixture, which consists of methyltrichlorosilane, methylvinyldichlorosilane and diphenyldichlorosilane Composition, the molar ratio of the three is 1.8:1:0.5, the volume ratio of the solvent to the chlorosilane mixture is 5:1, NH 3 , to NH 3 no longer absorbed, lowering NH 3 The speed of feeding was continued for 2 hours, the reaction was stopped, the ammonium chloride was removed by filtration, and the solvent toluene was washed 3 times, and the solvent and oligomers were removed by a decompression method, and the obtained liquid was polysilazane. The prepared polysilazane has a number average molecular weight of 630 and a viscosity of 50000cp.
[0047] 2. Preparation of silicone sealant
[0048] According to the ratio of each component shown in Table 5, mix each component evenly, ...
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