Characteristics and Application of HTV Silicone Rubber Mixer (2)

(1) silicone rubber has thermal conductivity.
The thermal conductivity of silicone is larger than that of general organic rubber. The thermal conductivity of silicone rubber can be improved by adding a large number of inorganic fillers. These materials can be used in heat sink and heating roller.

(2) silicone rubber has steam resistance.
Even after a long soak in water, silicone rubber absorbs only 1% of the water. And the mechanical strength and electrical characteristics are almost not affected at all (whether in cold water, warm water, boiled water, almost no change). However, in the high-pressure steam environment of 150℃, organosilicon will degrade and its performance will decline. The steam resistance can be improved by improving the formula, selecting the curing agent, prolonging the time of the second sulfurization, and the products with especially high steam resistance and heat resistance and water resistance can be developed.

(3) the radiation resistance of silicone rubber.
But it should be noted that the radiation resistance of ordinary dimethyl silicone rubber is not better than that of other organic rubber. Only the phenyl silicone rubber which is introduced into the organosilicone polymer has the radiation resistance property and has entered the practical stage in the cable and connector of nuclear power plant.

(4) the oil resistance, solvent resistance and chemical resistance of silicone rubber.
The oil resistance of silicone rubber at 100℃ is slightly worse than that of nitrile rubber and neoprene rubber. In & gt; In 100℃ environment, silicone rubber can play a better oil resistance. Silicone rubber will almost not be polar solvents and weak acid and weak base erosion, in non-polar solvents to swell, insoluble, remove the solvent can be restored to its original state. Silicone rubber is not resistant to strong acid and alkali. Solvent chemicals on silicone rubber swelling, softening, strength decline and other phenomena, different kinds of solvent on silicone rubber influence is not the same.

(5) the compression permanent deformation, bending fatigue and strength of silicone rubber.

Compression permanent deformation: organic rubber in room temperature compression permanent deformation is small, but with the change of temperature will increase significantly. The compression permanent deformation of silicone rubber in -60~250℃ is stable, that is to say, silicone rubber is better than organic rubber at very high temperature.

Resistance to bending fatigue: the bending fatigue resistance of silicone rubber is not better than that of organic rubber. Measures must be taken to develop varieties with 8~10 times fatigue resistance, such as KE951-U, 9510-U, 9511-U, 5152-U, etc. Used in keyboard, conveyor parts, etc.

Strength: at room temperature, the strength of silicone rubber is lower than that of organic rubber, but the strength retention rate is higher at high temperature, and the strength is better than that of organic rubber. The tear strength of silicone rubber is low. Only by improving the synthesis process of basic rubber and the filling agent and crosslinking agent of mixed rubber, can the tear strength of 30-50 kN/m high strength products be prepared, which is suitable for the use of reverse cone mold and forming materials of large forming products.

(6) silicone rubber has flame retardant properties.
Ordinary silicone rubber does not burn easily. Once it is ignited, it will burn up and finally become white silicon dioxide. If a small amount of flame retardant (such as platinum complex) is added to the silicone rubber, the flame retardant and self-extinguishing silicone rubber can be prepared. Grade UL94V-0 silicone rubber, because it contains no halogen compounds, produces almost no smoke and toxic gases. Applicable to household appliances, office supplies, electrical and even aircraft, subway and other closed space and building materials, become an indispensable product for safety.

(7) silicone rubber has permeability and physiological inertia.
Due to the large molecular gap of silicone rubber film, the transmission rate of its gas and steam is very good, which is much better than other organic rubber dozens of times to hundreds of times. At the same time, it is selective to the gas through, so it can be used as the separation membrane of gas and water in the rich oxidation equipment. Silicone rubber has better physiological inertia than other polymer materials, so it can be used in infusion tubes, artificial joints, nipples, swimming caps, diving goggles, cosmetics and so on.

(8) silicone rubber has anti-seismic, transparent, colorant, anti-stick and non-corrosive.
Ordinary silicone rubber has relatively small seismic resistance. On the product KE5501BU, which has improved seismic performance, it shows very stable seismic resistance within -50~100℃. Silicone rubber with high transparency and high strength can be prepared by adding very fine white carbon black and proper technology. Silicone has excellent demoulding and will not be corroded by other substances. Therefore, it is used in the fields of photocopier fixed roller, printing roller, sealing ring and lost wax casting mold.