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Filling rubber for preparing high-strength transparence room-temperature curing silicon rubber

A room temperature curing and filling technology, which is applied in adhesives, other chemical processes, chemical instruments and methods, etc., can solve the problem of the mechanical properties of room temperature curing silicone structural sealing silicone rubber, the limited effect of agglomeration and growth of silica particles, Affect the high transparency of sealing silicone rubber and other issues, and achieve the effect of inhibiting filler agglomeration, good optical and mechanical properties, and good mechanical properties

Inactive Publication Date: 2009-05-20
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this hydrophobic modification has a very limited effect on inhibiting the aggregation and growth of silica particles. In addition, the chain-like nano-silica aggregate structure is often not yet formed during the mixing process with polydimethylsiloxane. Due to the shearing and tearing provided by the equipment, it is fully stretched, and its surface is covered by rubber, making it difficult to realize its distribution in the polydimethylsiloxane matrix at the nanometer scale, which affects the filling room temperature. High transparency of cured silicone structural sealing silicone rubber
At the same time, the nano-silica agglomerated in the rubber compound cannot fully exert its reinforcing effect, but instead forms defects, which reduces the mechanical properties of the obtained room temperature curing silicone structural sealing silicone rubber.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 306.0g of methyl silicate (2.01mol) into alcohol water composed of 853.0g of absolute ethanol (concentration 99.5wt.%; the following examples are the same; the amount of substance converted into ethanol is 18.45mol) and 94.0g of distilled water In the solution, stir and dissolve, then add 50.0g of strong ammonia water (concentration 25wt.%, the same as in the following examples; the amount of substance converted into ammonia is 0.74mol, and the sum of the amount of substance contained in water and distilled water in ammonia is 7.54mol , the following calculation method is the same) and 70.0g hexamethyldisilazane (the amount of the hydrophobic group provided after hydrolysis is 0.87mol, the following calculation method is the same), stirred and reacted for 4 hours to obtain hydrophobic nano-silica alcohol water dispersion.

[0020] In a KL-2HV type kneader, premix the prepared hydrophobic nano-silica dispersion containing 7.7 parts by mass with 100 parts by mass of p...

Embodiment 2

[0024] Add 305.0g of methyl silicate (2.01mol) into the alcohol-water mixed solution composed of 855.0g of absolute ethanol (18.49mol) and 109.0g of distilled water, stir to dissolve, then add 32.0g of concentrated ammonia water (ammonia is 0.47mol, water The total amount is 7.63 mol) and 75.0 g of hexamethyldisilazane (0.87 mol of hydrophobic group), stirred and reacted for 2 hours to obtain a hydrophobic nano-silica dispersion.

[0025] In a KL-2HV type kneader, premix the prepared hydrophobic nano-silica dispersion containing 5.0 parts by mass with 100 parts by mass of polydimethylsiloxane for 5 minutes, then raise the temperature to 120°C, Mix at normal pressure for 2 hours, and then continue to mix for 1.5 hours under vacuum to obtain a colorless and transparent filler.

[0026] The acid glue was prepared according to the method of Example 1, and the test results: the tensile bond strength was 0.37MPa, the tensile strength was 1.02MPa, and the light transmittance was 89.6...

Embodiment 3

[0028] Add 305.0g of methyl silicate (2.01mol) into the alcohol-water mixed solution composed of 920.0g of absolute ethanol (19.90mol) and 70.0g of distilled water, stir to dissolve, then add 30.0g of concentrated ammonia water (ammonia is 0.44mol, water The total amount is 5.39 mol) and 71.0 g of hexamethyldisilazane (0.88 mol of hydrophobic group), stirred and reacted for 3 hours to obtain a hydrophobic nano-silica dispersion.

[0029] In a KL-2HV type kneader, premix the prepared hydrophobic nano-silica dispersion containing 7.0 parts by mass with 100 parts by mass of polydimethylsiloxane for 5 minutes, then raise the temperature to 130°C, Mix at normal pressure for 1.5 hours, and then continue to mix for 1.5 hours under vacuum to obtain a colorless and transparent filler.

[0030] The acid glue was prepared according to the method of Example 1, and the test results: the tensile bond strength was 0.49MPa, the tensile strength was 1.54MPa, and the light transmittance was 90....

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Abstract

The invention discloses a making method of fill gel of high-strength transparent indoor-temperature solidifying silicon rubber, which comprises the following steps: adding silicate ester in the alcohol-water composite solution to stir until dissolving; adding alkaline catalyst and surface hydrophobic agent; reacting for 1-12h; obtaining hydrophobic nanometer silica alcohol-water dispersant; blending 5-10% dispersant and 100% polydimethyl siloxane for 5-20 min; heating to 100-200 deg.c; smelting under normal pressure for 1-4h; extracting into vacuum to fuse continuously for 1-4h; obtaining colorless transparent flipper.

Description

technical field [0001] The invention belongs to the technical field of high-strength transparent room-temperature-curing silicone rubber, and in particular relates to a filler that can be used to prepare room-temperature-curing silicone structural sealing silicone rubber with good optical properties and mechanical properties. Background technique [0002] Although silicone rubber has a wide range of applications due to its excellent properties such as high temperature resistance, low temperature resistance, weather resistance, insulation, and aging resistance, it is widely used in room temperature curing silicone rubber for sealing and bonding in the construction industry. It is necessary to add reinforcing fillers to improve the mechanical properties and thixotropic properties of pure room temperature curing silicone rubber and obtain practical value. [0003] The reinforcing fillers added to room temperature curing silicone rubber are usually carbon black, nano-silica, nan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C09J183/04C09J11/04C09K3/10
Inventor 傅强王倩王跃林张琴
Owner SICHUAN UNIV
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