Methyl room temperature vulcanized silicone rubber


Methyl room temperature vulcanized silicone rubber is an old variety of general-purpose silicone rubber, which has the advantages of water resistance, ozone resistance, arc resistance, corona resistance and weathering resistance. It can be used in a temperature range of 60 to 200 °C. Therefore, it is widely used as a filling and sealing material for electronic and electrical components, and as a moisture-proof, shock-proof, high-low temperature resistant perfusion and sealing material for instrumentation. It can also be used to make molds for casting polyester resins, epoxy resins and low melting point alloy parts. It can also be used as an impression material for dental products. It is coated on cotton cloth and paper bag with methyl room temperature vulcanized silicone rubber to form a conveyor belt and a packaging bag for conveying viscous articles.




2. Methyl bisphenyl room temperature vulcanized silicone rubber


Methyl bisphenyl room temperature vulcanized silicone rubber has a wider operating temperature range (-100 to 250 ° C) than methyl room temperature vulcanized silicone rubber, in addition to the excellent properties of methyl room temperature vulcanized silicone rubber. The low phenyl room temperature vulcanized silicone rubber (108-1) with a phenyl content of 2.5 to 5% can maintain elasticity at a low temperature of -120 ° C, which is the best low temperature performance of silicone rubber; the phenyl content is 10 ~20% of room temperature glue (108-2) has good resistance to radiation, ablation and self-extinguishing. If a certain amount of heat-resistant additives such as Fe2O3 are added to it, it can improve heat aging performance. Use at high temperatures above °C or as a resistive putty coating and encapsulating material.




Methyl phenyl room temperature glue can be used for dipping, stamping and stripping, just like other room temperature glues. In order to increase the adhesion to other materials, the material to be adhered must be surface treated before using the material. The surface treatment steps are as follows: the surface of the material is washed 1 or 2 times with acetone solvent, and then treated with a surface agent. ~2 times, baked in an oven at 60 ° C for a few minutes, at this time on the surface of the material to form a layer of less sticky film, you can glue.




3. Methyl block room temperature vulcanized silicone rubber


The methyl block room temperature vulcanization silicone rubber is a modified version of methyl room temperature vulcanized silicone rubber, which is a polydimethylsiloxane (107 gum) and a methyltriethoxysilane oligomer which are blocked by a hydroxyl group ( A copolymer having a molecular weight of 3 to 5). Under the catalysis of dibutyltin dilaurate, the hydroxyl group in the polydimethylsiloxane and the ethoxy group in the polymethyltriethoxysilane condense to form a three-directional polymer, the vulcanized bomb The body has higher mechanical strength and adhesion than methyl room temperature vulcanized silicone rubber, and can be used for a long time in a temperature range of 70 to 200 °C.




Methyl block room temperature vulcanized silicone rubber has anti-vibration, moisture-proof, waterproof, breathable, ozone-resistant, weather-resistant, weak acid and weak base properties. It has good electrical insulation properties, good adhesion and low cost. Therefore, it can be widely used for potting, coating, stamping, demoulding, releasing drug carriers and the like. The electronic components potted with methyl block room temperature glue have the functions of shockproof, moisture proof, sealing, insulation and stability. By directly coating the methyl block room temperature glue on the speaker, the intermediate frequency of the speaker can be reduced and eliminated, and the resonant frequency performance of the speaker after vulcanization can be reduced by about 20 Hz. It can be used as a paper release agent after blending a certain amount of additives into the methyl block room temperature gel. After coating a thin layer of methyl block room temperature glue on the confectionery and biscuit conveyor belt of the food industry, the anti-stick property of the canvas can be improved, thereby improving the appearance of the food and improving the utilization rate of the raw material.




Add appropriate amount of fumed silica to the methyl block room temperature gel for installation of window glass, curtain walls, window frames, joints for prefabricated panels, and expansion joints for airport runways. In addition, it can also be used as an adhesive for magnetic cores and stencils in electronic computer memory, and as an adhesive for conductive silicone rubber and non-conductive silicone rubber. Treatment of the fabric with methyl block room temperature vulcanized silicone rubber improves the hand, softness and resistance to sharpening of the fabric.




4. Room temperature vulcanized silicone rubber


Room temperature vulcanized silicone rubber is poly-β-nitrile ethyl methyl siloxane. The room temperature vulcanization silicone rubber has the characteristics of light resistance, ozone resistance, moisture resistance, high and low temperature resistance and excellent electrical insulation properties. The solvent is excellent in resistance to aliphatic and aromatic solvents, and its oil resistance is similar to that of ordinary oil-resistant nitrile rubber. It can be used as a sealed injection material for oil-contaminated parts and oil-resistant electronic components.




5. Room temperature vulcanized fluorosilicone rubber


The room temperature vulcanized fluorosilicone rubber is poly γ-trifluoropropyl methyl siloxane, which is mainly characterized by fuel oil resistance, solvent resistance and high temperature resistance to degradation, and also has good extrusion properties. Mainly used for sealing and caulking of supersonic aircraft integral fuel tank, fluorosilicone rubber gasket, gasket bonding; silicone rubber and fluorosilicone rubber bonding, chemical engineering and general industrial fuel oil resistance; solvent resistant parts Bonding.




6. Room temperature vulcanization of phenylene silicone rubber


The room temperature vulcanized phenylene silicone rubber is a silicon benzene (biphenyl) siloxane polymer, which has the outstanding advantage of having excellent high energy ray resistance. Tests have shown that after being subjected to 1x109 roentgen γ-ray or 1xl018 neutron/cm 2 neutron irradiation, the rubber elasticity can be maintained, which is 10-15 times larger than room temperature vulcanized methyl silicone rubber and 5~ larger than room temperature vulcanized phenyl silicone rubber. 10 times.




Room temperature vulcanized phenylene silicone rubber can be used as a high temperature resistant and radiation resistant adhesive sealing material and an insulating protective layer for motors in atomic energy industry, nuclear power plant and space flight.
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