A deoxime type oil-resistant fluorosilicone sealant and preparation method thereof
A sealant and deoxime-type technology, which is applied to chemical instruments and methods, adhesives, and other chemical processes, can solve the problems of poor stability and poor oil resistance of sealants, and achieve less raw materials, outstanding oil resistance, and excellent craftsmanship. easy effect
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Embodiment 1
[0035] The preparation of oil-resistant deoxime-type fluorine-containing silicone sealant, the steps are as follows:
[0036] (1) Put 66 parts by weight of hydroxyl-terminated polydimethylsiloxane raw materials into a kneader, and add 25 parts by weight of hydroxyl-terminated polytrifluoropropylmethylsiloxane at a speed of 50 rpm alkanes, vacuumed to 1×10 -3 ~1×10 -4 Pa, stirred and mixed for 40 minutes to obtain pretreatment raw material A;
[0037] (2) Under stirring conditions, the surface of 12 parts by weight has been hydrophobically modified with hexamethyldisilazane, and the specific surface area is 80-250m 2 / g fumed white carbon black was added to the pretreatment raw material A in five times, and stirred for 3.5 hours at a speed of 60 rpm to obtain the mixture B;
[0038] (3) in 1×10 -3 ~1×10 -4 Under the condition of Pa vacuum, the temperature was raised to 110° C., the stirring was continued for 30 minutes, and after cooling to room temperature, mixture C was o...
Embodiment 2
[0043] The preparation of oil-resistant deoxime-type fluorine-containing silicone sealant, the steps are as follows:
[0044] (1) Put 72 parts by weight of hydroxyl-terminated polydimethylsiloxane raw materials into a kneader, and add 19 parts by weight of hydroxyl-terminated polytrifluoropropylmethylsiloxane at a speed of 50 rpm alkanes, vacuumed to 1×10 -3 ~1×10 -4 Pa, stirred and mixed for 35 minutes to obtain pretreatment raw material A;
[0045] (2) Under stirring conditions, the surface of 10 parts by weight has been hydrophobically modified with hexamethyldisilazane, and the specific surface area is 80-250m 2 / g fumed white carbon black was added to the pretreatment raw material A in five times, and stirred for 3.5 hours at a speed of 65 rpm to obtain the mixture B;
[0046] (3) in 1×10 -3 ~1×10 -4 Under the condition of Pa vacuum, the temperature was raised to 110°C, the stirring was continued for 35 minutes, and after cooling to room temperature, the mixture C wa...
Embodiment 3
[0051] The preparation of oil-resistant deoxime-type fluorine-containing silicone sealant, the steps are as follows:
[0052] (1) Put 78 parts by weight of hydroxyl-terminated polydimethylsiloxane raw materials into a kneader, and add 13 parts by weight of hydroxyl-terminated polytrifluoropropylmethylsiloxane at a speed of 55 rpm alkanes, vacuumed to 1×10 -3 ~1×10 -4 Pa, stirred and mixed for 40 minutes to obtain pretreatment raw material A;
[0053] (2) Under stirring conditions, the surface of 8 parts by weight has been hydrophobically modified with hexamethyldisilazane, and the specific surface area is 80-250m 2 / g fumed white carbon black was added to the pretreatment raw material A in five times, and stirred for 3 hours at a speed of 65 rpm to obtain the mixture B;
[0054] (3) in 1×10 -3 ~1×10 -4 Under the condition of Pa vacuum, the temperature was raised to 120°C, the stirring was continued for 50 minutes, and after cooling to room temperature, the mixture C was o...
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