Adhesive for silicone mica tape and preparation method of adhesive

A silicone rubber, silicone technology, applied in the direction of adhesives, coatings, etc., can solve the problems of inability to undergo cross-linking and curing, unfavorable electrical insulation performance of motors, and reduce the final performance of silicone-less tapes, and achieve good chemical compatibility. properties, high viscosity, and the effect of improving insulation performance

Active Publication Date: 2014-01-22
ZHUZHOU TIMES ELECTRIC INSULATION
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AI-Extracted Technical Summary

Problems solved by technology

But the disadvantage is that the silicon-hydrogen bonds in the adhesive are easy to react with uneliminated hydroxyl groups, water, organic acids, alcohols, etc. during production and storage, thereby reducing the final performance of the silicone-less adhesive tape, which is not conducive to the electrical properties of the...
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Abstract

The invention discloses an adhesive for a silicone mica tape and a preparation method of the adhesive. The adhesive for the silicone mica tape is prepared from phenyl vinyl organic silicon rubber and MQ silicon resin through dehydration condensation under the action of a catalyst. The preparation method comprises the steps of completely dissolving the phenyl vinyl organic silicon rubber and the MQ silicon resin in an organic solvent, respectively; mixing and stirring a phenyl vinyl organic silicon rubber solution, a vinyl MQ silicon resin solution and the catalyst in a reactor, heating to 100-120 DEG C and reacting, and discharging when solid content is 50-60% and dynamic viscosity at 23 DEG C is (2-8)*10<4>cP, thus obtaining the adhesive for the silicone mica tape. The adhesive for the silicone mica tape has excellent physical compatibility and chemical compatibility with solvent-free silicone impregnating varnish, and the preparation method is simple and convenient, and low in cost.

Application Domain

CoatingsAdhesives

Technology Topic

SolventAdhesive +12

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  • Adhesive for silicone mica tape and preparation method of adhesive
  • Adhesive for silicone mica tape and preparation method of adhesive
  • Adhesive for silicone mica tape and preparation method of adhesive

Examples

  • Experimental program(3)

Example Embodiment

[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]

Example Embodiment

[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.

Example Embodiment

[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) ).

PUM

PropertyMeasurementUnit
Dynamic viscosity80000.0cp
Dynamic viscosity85000.0cp
Dynamic viscosity68000.0cp

Description & Claims & Application Information

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