Natural rubber can be divided into standard rubber (also known as particle glue), smoke film, condensed rubber, white film, light-colored film, rubber clear rubber and air-dry film, etc. The most commonly used are standard glue and smoke film. The standard glue is divided into four grades: SCR5, SCR10, SCR20, and SCR50. Cigarette glue is divided into five grades, namely, No. 1 to No. 5 smoke film (RSS1~RSS5).
Standard rubber: Standard rubber is mainly divided into No. 5 glue, No. 10 glue and No. 20 glue. No. 5 glue is a glue, which is the best glue, containing 0.05% of impurities; No. 10 glue is a secondary glue, which contains 0.10% of impurities; No. 20 glue is a third-grade glue, containing impurities It is 0.20%. The use of different types of glue is not the same: No. 5 glue is generally used to make tire inner tubes; No. 10 glue and No. 20 glue are generally used to make tires.
Smoke film: Dongguan rubber material is used to burn the smoke and heat generated from the coconut shell. The purpose of the smoke is to dry the film and inject the creosote that is resistant to oxidation and corrosion. Smoke film belongs to the primary shape of natural rubber.
Concentrate glue: It can be used as adhesive material.
Films:
Special grade thin white film
The goods must be very white and uniform, dry, solid rubber.
No signs of discoloration, sour odor, dust, crumb spots, grit or other foreign matter, oil or other smudges, oxidation, or overheating are allowed. First class thin white film
The deliveries must be white, dry, solid rubber. Allows slight differences in shades of shade.
No signs of discoloration, sour odor, dust, crumb spots, grit or other foreign matter, oil or other smudges, oxidation, or overheating are allowed. A thin light color film
The deliveries must be very light and uniform, dry, solid rubber.
No signs of discoloration, sour odor, dust, crumb spots, grit or other foreign matter, oil or other smudges, oxidation, or overheating are allowed. A thin light color film
The deliveries must be light, dry, solid rubber. Allows slight differences in shades of shade. No signs of discoloration, sour odor, dust, crumb spots, grit or other foreign matter, oil or other smudges, oxidation, or overheating are allowed. Secondary thin light color film
The deliveries must be dry, solid rubber. The color is slightly deeper than a thin, light-colored film. Allows slight differences in shades of shade. Rubber with streaks and streaks to the extent indicated by the specimen is allowed. However, the number of such plastic bags in the tested plastic bags must not exceed 10% of the number of test plastic bags.
No discoloration, dust, crumb spots, grit or other foreign substances, oil or other stains, oxidation or overheating may be caused by any cause other than those permitted above.
Three thin light color film
The deliveries must be light yellow, dry, solid rubber. Differences in shades are allowed.
Rubber with streaks and streaks to the extent indicated by the specimen is allowed. However, in plastic bags where Dongguan rubber materials are inspected, the number of such plastic bags must not exceed 20% of the number of test plastic bags.
synthetic rubber
1, according to the finished product
Can be divided into liquid rubber (such as hydroxyl-terminated polybutadiene), solid rubber, latex and powdered rubber. Latex: rubber colloidal water dispersion;
Liquid rubber: An oligomer of rubber that is generally viscous before it has been vulcanized;
Powder rubber: The latex is processed into a powder for the benefit of ingredients and processing.
2, according to raw rubber filling other non-rubber components
It can be divided into oil-filled masterbatch, carbon-filled black masterbatch and filled lignin masterbatch.
3, according to the formation of rubber products
Can be divided into thermoplastic rubber (such as three-block thermoplastic styrene butadiene styrene rubber can be repeatedly processed), vulcanized rubber (to be obtained through the vulcanization of finished products, most of the synthetic rubber is such).
Thermoplastic rubber developed in the 1960s: Instead of being chemically vulcanized, it was formed using thermoplastic processing methods.
4, in practical applications, according to the use of characteristics
Divided into general-purpose rubber and special rubber two categories. General-purpose rubber refers to rubber that can be partially or completely replaced by natural rubber, such as styrene-butadiene rubber, isoprene rubber, and butadiene rubber, and is mainly used for manufacturing various tires and general industrial rubber products. General rubber has a large demand and is the main product of synthetic rubber.
Special rubber refers to rubbers with characteristics of high temperature resistance, oil resistance, ozone resistance, aging resistance, and high airtightness. Silicon rubber, various fluorine rubbers, polysulfide rubbers, chlorine alcohol rubbers, nitrile rubbers, and polyacrylic acids are commonly used. Ester rubber, urethane rubber and butyl rubber are mainly used in special occasions where certain characteristics are required.
SBR
SBR is made of butadiene and styrene copolymers, is the largest production of general-purpose synthetic rubber, rubber materials in Dongguan, SBR, SBR and thermoplastic rubber (SBR).
Butadiene rubber
The butadiene is obtained by solution polymerization. The butadiene rubber has particularly excellent cold resistance, abrasion resistance and elasticity, and also has good aging resistance. The majority of butadiene rubber is used to produce tires, and a small part is used to make cold-resistant products, cushioning materials, tapes, and rubber shoes. The disadvantages of butadiene rubber are poor tear resistance and poor wet skid resistance.
Isoprene rubber
Isoprene rubber is an abbreviation for polyisoprene rubber and is produced by solution polymerization. Isoprene rubber, like natural rubber, has good elasticity and wear resistance, excellent heat resistance and good chemical stability. The raw rubber of isoprene rubber (before processing) has a significantly lower strength than natural rubber, but its quality uniformity and processing performance are superior to natural rubber. Isoprene rubber can be used instead of natural rubber to make heavy-duty tires and off-road tires. It can also be used to produce a variety of rubber products.
Ethylene propylene rubber
Ethylene-propylene rubber is synthesized with ethylene and propylene as the main raw materials, and its aging resistance, electrical insulation properties and ozone resistance are outstanding. Ethylene-propylene rubber can be filled with oil and filled with carbon black. The price of the product is low, and the ethylene-propylene rubber is chemically stable. The wear resistance, elasticity, oil resistance and styrene-butadiene rubber are close. Ethylene-propylene rubber has a wide range of uses. It can be used as tire sidewalls, rubber strips and inner tubes, as well as parts for automobiles. It can also be used for wire and cable sheathing and high-voltage, ultra-high-voltage insulation materials. Can also manufacture rubber shoes, hygiene products and other light-colored products.
Neoprene rubber
It is based on chloroprene as the main raw material and is made by homopolymerization or a small amount of other monomers. Dongguan rubber materials such as high tensile strength, heat resistance, light resistance, excellent aging resistance, oil resistance are better than natural rubber, styrene butadiene rubber, butadiene rubber. It has strong flame resistance and excellent resistance to flammability, high chemical stability and good water resistance. The disadvantages of neoprene rubber are electrical insulation, poor cold resistance, and raw rubber is not stable during storage. Neoprene is used in a wide range of applications, such as for the manufacture of conveyor belts and transmission belts, wire and cable sheathing materials, oil-resistant hoses, gaskets, and chemical-resistant equipment linings