Rubber plate is rubber as the main raw material processing with a certain thickness and large area of flake products, can be divided into non-vulcanized and vulcanized rubber plate, is widely used in industrial and mining enterprises, transportation and housing ground and other fields. In actual production, the performance requirements of rubber sheets for different use occasions are different, and the appropriate rubber varieties need to be selected. Recycled rubber is the main raw material to reduce the production cost of rubber sheet at present, and its variety and dosage directly determine the finished index and service life of rubber sheet.
1. Classification of rubber sheets
Rubber plate according to the performance and environment can be divided into ordinary rubber plate, acid and alkali resistant rubber plate, oil resistant rubber plate, heat resistant rubber plate, anti-static rubber plate, conductive rubber plate, flame retardant rubber plate, wear-resistant rubber plate, etc. According to the structural form, it can be divided into pure rubber rubber board, rubber and plastic rubber board, pattern rubber board, sponge rubber board, cloth rubber board, etc., different varieties of rubber board mechanical properties and technical conditions are different, need to choose the appropriate recycled rubber, reduce more production costs under the premise of ensuring product quality.
2. Ordinary rubber plate
Ordinary rubber plate is generally natural rubber, styrene butadiene rubber, butadiene rubber, recycled rubber as the main raw material processing, can be used alone, can also be used with the above rubber, in which the raw rubber content of the rubber plate is controlled at 20%-40%, appropriate adjustment of the amount of rubber and compounding agent can further optimize the comprehensive performance of ordinary rubber plate finished products. In the actual production, the ordinary rubber plate uses more tire recycled rubber HYL7Y9Y2YWFM, the product price is low, and the compatibility with the general rubber is good, and the rubber plate with stable performance is prepared alone or with the raw rubber, reducing the cost.
Ordinary rubber plates containing recycled rubber generally use sulfur vulcanization, with accelerator M, etc.; Appropriate amount of calcium carbonate, clay, barite powder and carbon black; Appropriate use of oil and coumaron to improve the process performance of the compound; Better coordinate the relationship between other physical properties of rubber sheet and the hardness and process properties of rubber material. In actual production, recycled rubber can also be used with natural rubber, styrene butadiene rubber, high pressure polyethylene, high styrene, etc., to prepare low-cost rubber and plastic composite rubber sheet.
3. Acid and alkali resistant rubber plate
The so-called acid and alkali resistant rubber plate, that is, the rubber plate that is not easy to expand, contract, soften or crack in the acid and alkali medium for a long time, is generally processed from natural rubber, neoprene rubber, EPidiene diene rubber or fluorine rubber as the main raw material, and can be used as acid and alkali lining, gasket and so on. In actual production, the acid and alkali resistance of the rubber plate mainly depends on the rubber itself, the chemical properties of EPigenetic-propylene diene recycled rubber and butyl recycled rubber are relatively stable, and can be used in a small amount of acid and alkali resistant rubber plate production to reduce costs under the premise of ensuring the quality of the rubber plate.
In actual production, appropriately increasing the cross-linking density of rubber material can improve the corrosion resistance of vulcanized rubber, such as increasing the amount of sulfur in the sulfur vulcanization system to 4-5 parts, and using resin vulcanization of butyl rubber. The selection of chemically inert fillers such as clay, barium sulfate, talc powder, etc. is more beneficial to improve the acid and alkali resistance of rubber sheets. In addition, the appropriate amount of 1-2 paraffin wax, the appropriate use of polyvinyl chloride, polyethylene and polypropylene can also improve the acid and alkali resistance of the rubber plate.
4. Oil-resistant rubber plate
The oil-resistant rubber plate needs to work in the oil medium for a long time, and the penetration of oil will cause the rubber to swell, destroy the vulcanized rubber network structure, and the mechanical properties of rubber will decline. In actual production, the swelling capacity of rubber in oil media mainly depends on the chemical properties of rubber and oil. Rubber with polar groups is difficult to swell in solvents, such as nitrile rubber, neoprene rubber, acrylic rubber and so on. Nitrile rubber and neoprene rubber can use recycled rubber to reduce costs when producing oil-resistant rubber plates.
In actual production, nitrile butadiene rubber is the most commonly used oil-resistant rubber variety, and the appropriate use of nitrile rubber recycled rubber in the oil-resistant rubber plate with nitrile rubber as the main raw material can ensure the oil resistance of the product while effectively reducing the cost of raw materials. When using nitrile rubber/recycled rubber and producing oil-resistant rubber plates with rubber, sulfur vulcanization is generally selected, and the amount is controlled between 1.5-2.5 parts; Appropriate use of carbon black, clay, calcium carbonate; Choose low molecular weight polyethylene, oil paste, use aromatic oil and ester as softener, not easy to be extracted by oil.
5. Heat-resistant rubber
Rubber at high temperature or under the action of hot oxygen will cause the cracking of the polymer main chain and the destruction of the crosslinking, and sometimes further crosslinking will occur, resulting in the rubber becoming hard, brittle, and mechanical properties decreasing. Generally, butyl rubber with low unsaturation, EPDM rubber, fluorine rubber with halogen elements on the molecular side chain, chlorinated butyl rubber, and silicone rubber with inorganic elements in the molecular main chain segment have excellent heat resistance.
In actual production, EPDM recycled rubber, butyl recycled rubber, chlorinated butyl recycled rubber and nitrile recycled rubber can be used for heat-resistant rubber plate production, effectively reducing raw material costs. Choose thiuram type sulfur carrier or effective vulcanization system vulcanization, recycled rubber vulcanization has better heat resistance, nitrile recycled rubber, ethylene propylene diene recycled rubber is recommended to choose peroxide vulcanization, butyl recycled rubber using resin vulcanization.
6. Conductive rubber plate
The resistance value of the conductive rubber plate is very small, generally using a larger polarity of nitrile rubber or neoprene rubber, with a high structure of acetylene carbon black, conductive furnace black and so on. Tire tread recycled rubber or nitrile recycled rubber can be added in the production of conductive rubber plate with NBR as the main raw material to effectively reduce the raw material cost of conductive rubber plate. Appropriate use of metal powder can further improve the conductivity of the conductive rubber plate; It is recommended to use phosphate esters as plasticizers.
7. Insulating rubber sheet
Non-polar rubber has a high resistivity, good electrical insulation properties, such as ethylene propylene rubber and butyl rubber, natural rubber can also be used as low-voltage electrical insulation rubber. In actual production, EPDM recycled rubber and butyl recycled rubber can be used with the corresponding varieties of rubber to prepare low-cost insulating rubber board, which can reduce the cost and improve the process performance of rubber material; Natural rubber production of low-voltage insulating rubber board can also be appropriate to use tire recycled rubber.
When using recycled rubber to produce insulating rubber board, it is recommended to select the reinforcing filling system composed of low structure carbon black, clay, talc powder, calcium carbonate, etc. Softener can choose paraffin wax or use paraffin wax with solid coumarone, or use petroleum jelly or naphthenic oil; The anti-aging system is recommended to use amine and p-phenylenediamine antioxidant, such as the appropriate addition of antioxidant H can further improve the electrical insulation of the insulating rubber board.
8. Flame retardant rubber plate
Generally containing halogen, benzene ring or conjugated double bond rubber has good flammability, such as neoprene rubber, fluorine rubber, silicone rubber, etc.; Styrene butadiene rubber, butadiene rubber and natural rubber are flammable rubber. Adding flame retardants such as chlorinated paraffin, antimony trioxide and aluminum hydroxide to flammable rubber can significantly improve the flame retardancy of the compound. Recycled rubber products in the tire recycled rubber, EPDM recycled rubber and other products can be mixed in the flame retardant rubber formula, effectively reduce the cost of raw materials.
9. Wear-resistant rubber plate
Wear-resistant rubber plate has high wear-resistance, good elasticity, low noise characteristics, requiring the use of rubber with wear-resistant, impact resistance, tear resistance, high strength, good elasticity and other characteristics, generally natural rubber or styrene butadiene rubber as the main raw material processing, appropriate use of latex recycled rubber, tire recycled rubber, nitrile recycled rubber can effectively reduce the cost of raw materials under the premise of ensuring product performance.
In actual production, rubber sheets can also fully use recycled rubber, and later Xiaobian has the opportunity to continue to share with you the specific application skills of recycled rubber in various types of rubber sheets.