Rubber is a highly elastic polymer. The word rubber comes from the Indian word cau-uchu, which means a tearful tree. Natural rubber is made by the latex that flows out of the clive tree when it is cut, which is solidified and dried. The nature and use of rubber rubber is a highly elastic polymer. The word rubber comes from the Indian word cau-uchu, which means a tearful tree. Natural rubber is made by the latex that flows out of the clive tree when it is cut, which is solidified and dried.
In 1770, the British chemist J. Priestley discovered that rubber cleaners could be used to erase pencil handwriting, a term that was used today. The molecular chain of rubber can be cross-linked, and when the rubber is deformed by external forces, it has the ability to recover quickly, and has good physical and physical properties and chemical stability. Rubber is the basic raw material of the rubber industry, widely used in the manufacture of tires, hoses, tape, cables and other rubber products.
Rubber is divided into natural rubber and synthetic rubber according to raw materials. It is divided into blocky raw rubber, latex, liquid rubber and powder rubber by form. Latex is a collide-like water dispersion of rubber, liquid rubber is a olimer of rubber, which is generally a viscous liquid before non-vulcanization, and powder rubber is a powdered latex processing for the use of ingredients and processing.
Thermoplastic rubber, developed in the 1960s, does not require chemical vulcanization, but is formed by processing thermoplastics. Rubber is divided into general type and special type according to its use. The comprehensive performance of general-purpose rubber is good and widely used. The main are: natural rubber. From the latex of the tri-leaf rubber tree, the basic chemical composition is shun-poly isoprene. Good elasticity, high strength, good overall performance.
Isoprene rubber. Full name Shun-1,4-poly isoprene rubber, made of isoprene high-shun synthetic rubber, because of its structure and performance and natural rubber similar, so also known as synthetic natural rubber.
Sbr. SBR, for short, is made from butylene and styrene co-ed. According to the production method, it is divided into emulsion polymerized butyl rubber and solution polymerized butyl rubber. Its comprehensive performance and chemical stability are good.
Shunding rubber. Full name Shun-1,4-polybutylene rubber, referred to as BR, is made from butene polymerization. Compared with other general-purpose rubbers, the cold resistance, wear resistance and elasticity of shunding rubber after vulcanization are particularly excellent, the dynamic load is less hot, the resistance to aging is good, easy to use with natural rubber, neoprene, butyl rubber and so on.
Special rubber refers to rubber with certain special properties. Mainly: neoprene. CR, for short, is produced by chlorobutylene polymerization. Good comprehensive performance, oil, fire, oxidation and ozone resistance. However, its density is large, easy to crystallize hard at room temperature, storage is not good, cold resistance is poor.
Nbr. NBR, for short, is made from butylene and acrylonitrile. Good oil resistance and aging resistance, it can be used in 120 air or in 150 oils for a long time. In addition, it has water resistance, air tightness and excellent bonding properties.
Silicone rubber. The main chain consists of silicon oxygen atoms alternating, with organic groups on the silicon atoms. High and low temperature resistance, ozone resistance, good electrical insulation.
Fluororubber. A synthetic rubber containing fluorine atoms in a molecular structure. It is usually expressed in the number of fluorine atoms containing fluorine units in the co-property, such as fluoroelastomer 23, which is a co-property of partial teflon and teflon. Fluoroelas rubber is resistant to high temperature, oil and chemical corrosion. Polysulfur rubber. It is composed of polysulphides of nihalides and alkali metals or alkaline earth metals. Excellent oil and solvent resistance, but the strength is not high, aging resistance, processing is not good, odor, more and butyl rubber.
In addition, there are polyurethane rubber, chlorol rubber, acrylate rubber and so on. Rubber processing editing this paragraph of the basic process includes plasticization, mixing, pressing or extrusion, molding and vulcanization and other basic processes, each process for products have different requirements, respectively, with a number of auxiliary operations.
In order to be able to add a variety of required compounds into rubber, raw rubber first needs to be molded to improve its plasticity, and then through the mixing of carbon black and various rubber additives and rubber evenly mixed into the glue, the glue is pressed out into a certain shape blank, and then combined with the pressed hanging or coated textile material (or with the metal material) into a semi-finished product, and finally by vulcanization and plastic semi-finished products into a highly elastic final product. The role of rubber agents can be divided into vulcanization, anti-wearing, anti-coking, promotion, bonding and other roles.