High temperature resistant silicone rubber tube is the basic raw material of high temperature silicone rubber hose industry. It is widely used in the manufacture of tires, rubber hose, adhesive tape, cable and other high temperature silicone rubber hose products. Classification of high temperature silicone rubber hose:
1, according to the raw material is divided into natural high temperature silicone hose and synthetic high temperature silicone rubber hose.
2, according to the form is divided into block rubber, latex, high temperature resistant silicone liquid and powder of high temperature resistant silicone tube.
Colloidal water dispersion of high temperature silicone rubber latex;
High temperature resistant silicone rubber hose is an oligomer of rubber, which is viscous liquid before vulcanization;
Powdered rubber is to process the emulsion into powder, in order to facilitate the ingredients and processing.
3, according to the use of general and special type.
The general rubber has good comprehensive performance and wide application. The main contents are as follows: 1. Isoprene rubber, also known as synthetic natural rubber. Styrene butadiene rubber, referred to as SBR. The butadiene rubber, referred to as BR.
Special rubber is rubber with some special properties. Mainly there:
Silicone rubber, referred to as SILICONE
The main chain is composed of alternating layers of silicon oxygen atoms. High and low temperature resistance, ozone resistance, good electrical insulation. Use temperature of - 40 DEG C +220 DEG C; in high temperature, oil resistant, abrasion resistance, oil resistance! The utility model is especially suitable for the crankshaft oil seal of an automobile engine, which is not easy to be volatile and volatile oil (diesel oil, gasoline), and is resistant to oxygen, ozone and sunlight.
Fluorine rubber. Viton
Synthetic rubber containing fluorine atom in substructure. It is usually expressed as the number of fluorine atoms in the fluorine containing unit of the copolymer, such as fluorine rubber 23, which is a copolymer of vinylidene fluoride and fluorine, which is a kind of vinylidene fluoride with a range of two to three. High temperature resistance, oil resistance and chemical corrosion resistance. Oil resistance, high temperature resistance, chemical resistance, but also has the characteristics of acid and alkali. Use temperature - 30 DEG C +280 C. The utility model is suitable for the crankshaft oil seal, the timing oil seal, the O type ring and the sealing ring used for the chemical agent
Chloroprene rubber, referred to as CR.
Prepared by polymerization of chloroprene. Has a good comprehensive performance, oil resistance, fire resistance, oxidation resistance and ozone resistance. However, the density is large, easy to crystallize at room temperature, storage, poor cold resistance.
The nitrile rubber, referred to as NBR.
Prepared by copolymerization of butadiene and acrylonitrile. With good oil resistance, heat resistance, cold resistance, pressure resistance and water resistance, air tightness and excellent bonding properties, and abrasion resistance is suitable, the temperature is approximately 40 DEG C 120 commonly used, can be used for a long time at the temperature of 120 DEG C in the air or oil at 150 c..
The utility model is easy to be molded into any hydraulic seal with a metal shape, and therefore, the utility model is the most suitable for producing hydraulic cylinder sealing parts whose working pressure is not more than 32Mpa. The specially designed formula, easy to press the hair oil: wear resistance can withstand the mechanical vehicle shaft speed 3000 rev / min (at this time the rubber hardness of 70 degrees).
The polyurethane rubber
A kind of synthetic rubber, the highest tensile strength, it has excellent oil resistance, heat resistance, cold resistance, pressure resistance and wear resistance, usually using a temperature of - 40 DEG C to 80 DEG C, polyurethane rubber sealing performance at superior Ding Qing rubber, it is particularly suitable for pressure, high pressure and ultra high pressure hydraulic cylinder seals used in making.
The polysulfide rubber.
By sulfide polycondensation two halogenated and alkali metal or alkaline earth metal and. Has excellent oil resistance and solvent resistance, but the intensity is not high, aging resistance, good workability, smell, and used more with nitrile rubber.
In addition, polyurethane rubber, epichlorohydrin rubber, acrylic rubber, etc.