Adhesive for silicone mica tape and preparation method of adhesive

[0023] Example 1:

[0024] An adhesive for silicone-less tape of the present invention is prepared by dehydration polycondensation of phenyl vinyl silicone rubber and vinyl MQ silicone resin with a mass ratio of 10:11 under the action of a catalyst dibutyl tin dilaurate.

[0025] In phenyl vinyl silicone rubber, the molar ratio of methyl, phenyl and vinyl is 100:20:3, and the dynamic viscosity of phenyl vinyl silicone rubber is 8×10 4 cP.

[0026] The general formula of the molecular structure of phenyl vinyl silicone rubber in this embodiment is:

[0027]

[0028] Among them, a, b, and c are all positive integers.

[0029] In vinyl MQ silicone resin, the molar ratio of M/Q is 0.7:1, and the molar ratio of methyl to vinyl is 100:7.

[0030] A method for preparing the adhesive for silicone-less tape of this embodiment described above includes the following steps:

[0031] 100g of phenyl vinyl silicone rubber is completely dissolved in 40g of toluene. The molar ratio of methyl, phenyl and vinyl in the phenyl vinyl silicone rubber is 100:20:3. The dynamic viscosity is 8×10 4 cP; 110g vinyl MQ silicone resin is completely dissolved in 110g toluene, the molar ratio of M/Q in the vinyl MQ silicone resin is 0.7:1, and the molar ratio of methyl to vinyl is 100:7; the resulting benzene The toluene solution of vinyl-based organosilicon rubber and the toluene solution of vinyl MQ silicone resin are added to a reactor with an oil-water separation device and a condensation system, and 4g of dibutyltin dilaurate is added to the reactor to react to the mixture in the reactor. Stir and heat to react at 110°C. During the reaction, take samples every 15 minutes to determine the solid content and dynamic viscosity. When the measured solid content is 57% and the dynamic viscosity at 23°C is 60,000 cP, discharge the material while it is hot. Adhesive for silicone-less tape.

[0032] Analysis of main indicators

[0033] 1. Compound 120g/m of the adhesive for silicone-less tape prepared in this embodiment above 2 Mica paper, 33.3g/m 2 The glass cloth was used to obtain the silicone-less tape, and the conventional performance of the silicone-less tape was tested. The results are shown in Table 1.

[0034] Table 1 Conventional performance table of silicone tape

[0035]

[0036] 2. Mix the above-prepared adhesive for silicone tape with solvent-free silicone dipping varnish (produced by Wacker, Germany, brand H62C) in a mass ratio of 1:3, and the adhesive paint mixture is obtained after curing. The electrical performance data of the obtained glue paint mixture was tested, and the results are shown in Table 2.

[0037] Table 2 Electrical performance data table of glue paint mixture

[0038]

[0039] 3. Wrap the electromagnetic coil film and the above-prepared silicone tape, etc., and then treat it with a solvent-free silicone dipping varnish (produced by Wacker, Germany, brand H62C) and bake and solidify to prepare a coil test sample. The electrical performance test results of the coil test samples are shown in Table 3.

[0040] Table 3 Electrical performance test results of the coil

[0041]

[0042] Example 2:

[0043] An adhesive for silicone-less tape of the present invention is prepared by dehydration polycondensation of phenyl vinyl silicone rubber and vinyl MQ silicone resin with a mass ratio of 10:10 under the action of a catalyst dibutyl tin dilaurate.

[0044] In phenyl vinyl silicone rubber, the molar ratio of methyl, phenyl and vinyl is 100:33:7, and the dynamic viscosity of phenyl vinyl silicone rubber is 8.5×10 4 cP.

[0045] The general formula of the molecular structure of phenyl vinyl silicone rubber in this embodiment is:

[0046]

[0047] Among them, a, b, and c are all positive integers.

[0048] In vinyl MQ silicone resin, the molar ratio of M/Q is 0.8:1, and the molar ratio of methyl to vinyl is 100:6.

[0049] A method for preparing the adhesive for silicone-less tape of this embodiment described above includes the following steps:

[0050] 100g of phenyl vinyl silicone rubber is completely dissolved in 80g of toluene. The molar ratio of methyl, phenyl and vinyl in the phenyl vinyl silicone rubber is 100:33:7. The phenyl vinyl silicone rubber The dynamic viscosity is 8.5×10 4 cP; 100g vinyl MQ silicone resin is completely dissolved in 100g toluene, the molar ratio of M/Q in the vinyl MQ silicone resin is 0.8:1, and the molar ratio of methyl to vinyl is 100:6; the resulting benzene The toluene solution of vinyl-based organosilicon rubber and the toluene solution of vinyl MQ silicone resin are added to a reactor with an oil-water separation device and a condensation system, and 4g of dibutyltin dilaurate is added to the reactor to react to the mixture in the reactor. Stir and heat to react at 110°C. During the reaction, take samples every 15 minutes to determine the solid content and dynamic viscosity. When the measured solid content is 55% and the dynamic viscosity at 23°C is 50000cP, discharge the material while it is hot to obtain Adhesive for silicone-less tape.

[0051] Example 3:

[0052] The adhesive for silicone-less tape of the present invention is prepared by dehydration polycondensation of phenyl vinyl silicone rubber and vinyl MQ silicone resin with a mass ratio of 10:9 under the action of a catalyst dibutyl tin dilaurate.

[0053] In phenyl vinyl silicone rubber, the molar ratio of methyl, phenyl, and vinyl is 100:10:6, and the dynamic viscosity of phenyl vinyl silicone rubber is 6.8×10 4 cP.

[0054] The general formula of the molecular structure of phenyl vinyl silicone rubber in this embodiment is:

[0055]

[0056] Among them, a, b, and c are all positive integers.

[0057] In vinyl MQ silicone resin, the molar ratio of M/Q is 0.85:1, and the molar ratio of methyl to vinyl is 100:7.

[0058] A method for preparing the adhesive for silicone-less tape of this embodiment described above includes the following steps:

[0059] 100g of phenyl vinyl silicone rubber is completely dissolved in 80g of toluene. The molar ratio of methyl, phenyl and vinyl in the phenyl vinyl silicone rubber is 100:10:6. The dynamic viscosity is 6.8×10 4 cP; 90g vinyl MQ silicone resin is completely dissolved in 100g toluene, the molar ratio of M/Q in the vinyl MQ silicone resin is 0.85:1, and the molar ratio of methyl to vinyl is 100:7; the obtained benzene The toluene solution of vinyl-based organosilicon rubber and the toluene solution of vinyl MQ silicone resin are added to a reactor with an oil-water separation device and a condensation system, and 4g of dibutyltin dilaurate is added to the reactor. The mixture is stirred and heated to 110°C to react. During the reaction, samples are taken every 15 minutes to determine the solid content and dynamic viscosity. When the measured solid content is 55% and the dynamic viscosity at 23°C is 45000cP, discharge the material while it is hot. The adhesive for silicone tape is obtained.

[0060] In the above specific embodiments of the present invention, the catalyst can also be an acid (preferably dilute hydrochloric acid), a base (preferably triethylamine, sodium hydroxide), or other organotin compounds (preferably dibutyltin dibenzoate, dibutyltin oxide) ).