Polymer synthesis of fluorine rubber material synthesis technology is not the hardest, most key lies in fluorine rubber modified and processing technology.At present domestic sichuan the morning chemical research, Shanghai three love rich new material Co., LTD., jiangsu meilan chemical Co., LTD, fluorine rubber production technology are more mature, the total production capacity has reached 2500 t/a.
With the development of science and technology at home and abroad and to develop various types of fluorine rubber, mainly through the change polymerization monomer to realize, realize fluorine rubber composition and properties of different, in addition to the monomer composition, the processes of sulfide system is decided to fluorine rubber physical properties of the key factors.Processing technology is the key is sulfide system and processing AIDS.At present already developed vulcanization system has 3 kinds: molecule containing two amino compounds containing the 2 amine, two group of polyols compounds, peroxide and functionality of the compounds.One of the most widely used is polyols vulcanization system, using the polyols with the chemical limited to AF, and traditional 2 amine curing system, compared with compression system polyols permanent deformation of coke burning small and high security two advantages.Peroxide vulcanization system of the LianDian contains more stable in C-C key, so the vulcanizates of the resistance to chemicals corrosion performance more superior.In addition, the monomer containing ether cold level fluorine rubber, due to from partial fluorine ethylene key currently removal, so must by peroxide for sulfide.
Fluorine rubber processing AIDS many, add quantity, and also because the role of sulfide system, fluorine rubber type different and different, both at home and abroad, the main polyols vulcanization system.Plasticizer, domestic usually use stearic acid salt or low molecular weight fluorine rubber;The focal agent, when the glue material consumption, a high degree of automation of injection moulding out or in the process of coke prone to burn, also need to add a certain amount of the focal agent.NA£»Usually choose to nitro phenol, adjacent to the nitro benzoic acid, hydroxyl benzoic acid and the focal agent NA¡£Promoting agents, use polyols vulcanization system requirements promote agent should not only in the mixed refine and processing stage has good focal and performance, and with higher vulcanization rate.There is good accelerator is season phosphorus salt, such as 1-adjacent benzene 2 formex and amino acid base-4-butyl three phosphorus bromides, phenyl double (components simply pph3) imine chloride, three components simply phenyl trichloride, etc.;Activator, can not only promote the requirements of sulfide reaction, and can rise to absorb acid role, commonly used activator have magnesium oxide, calcium hydroxide, lamps, zinc oxide.Usually highly active magnesium oxide improve heat resistance;Resistance to permanent deformation calcium hydroxide improve compression sex;Zinc oxide can improve water resistance£»Lamps can improve acid proof;Other additives, in order to increase the melt strength, hardness, reduce the elongation, improve abrasion resistance, heat resistance, resistance to tear performance, often use MT carbon black (particles in the hot cracking furnace black) as reinforcing agent, of course, also can add ¡¾, calcium carbonate, such as high dispersion barite ore, mixed use as reinforcing agent¡£Join the low molecular weight polyethylene as film-former off.
Although fluorine rubber has many excellent performance, but there are also moulded poor liquidity, easy to compression deformation, raw rubber processing process performance and the physical properties of the vulcanizates bad etc.In order to solve fluorine rubber liquidity, can use high molecular weight (molecular weight at 200000 or more) and low molecular weight (molecular weight below 100000) fluorine rubber share, also can adjust the production process through a wide molecular weight distribution of fluorine rubber.In order to solve fluorine rubber compression permanent deformation properties, by adding the sulfide crosslinking agent, promoting agents and heat resistant additives way of making fluorine rubber obtain low compression permanent deformation, so as to solve GaoFu rubber and the physical and mechanical properties.In addition, there is a way to add inorganic packing of fluorine rubber modified.
Acm rubber is fluorine rubber or acrylic esters acrylate rubber and plastic blend thermoplastic elastomer of the formation of the new typeAcm rubber is mainly used for the auto industry and is known as the "car glue", fluorine rubber is mainly used in cars, so will fluorine rubber and price relatively low acrylates rubber blending could guarantee the performance under the precondition of not decline significantly reduce the production cost.Contains epoxy cures of sulfide point acm rubber through the dipole a dipole interaction and fluorine rubber form of immiscible blending glue, thus improving the blending of glue mechanical properties;In addition in the emulsion polymerization rubber fluorine surfactants used in the remnants of the existing carboxyl can through the hydrogen bonding weeks acrylates reaction get mixed solubleBut in use process found acrylates rubber and fluorine rubber blending the rubber in the heat and fluid swelling conditions cannot be very good work, in order to solve this problem, foreign research and development by the acm rubber, fluorine rubber and by multiple senses the derivation of acrylic esters acrylate plastic rubber blending made of new oil resistant and heat resistant thermoplastic elastomer.
Because fluorine rubber excellent technology performance, and its application to develop unceasingly, products type is more and more, the main products have all sorts of sealing materials, rubber, tape, tape, insulation material, etc.In the domestic main application in automobile and aviation aerospace field, and the domestic auto parts with fluorine rubber material¡¯s main products have engine crankshaft before oil seal, after the crankshaft oil seal, valve cylinder engine oil seal, diaphragm, engine cylinder liner resistance hydrosphere, refueling hose, China China high temperqture fuel hose, oil filter single asked valve, come on cover O-ring, gearbox and reduction gear oil seal, and so on.Fluorine rubber, silicone rubber and acm rubber elastomers and heat resistance in the future, with a rubber material development tendency and the mainstream, many car parts pieces by the performance of more excellent fluorine rubber to replace the traditional materials.
As lead-free petrol and efi device etc in cars use, fuel hose structure and material changes a lot, inside the fillet has developed using fluorine rubber instead of butyl rubber, in order to reduce fuel penetration and further improve the thermal stability, cover with composite structure in more, namely the fluorine rubber and LvChun rubber or acrylates rubber composition, because fluorine rubber are expensive, so fluorine rubber layer is thin, about 0.2 ~ 0.7 mm, the fuel hose structure has become the mainstream of foreign products, our country also has already developed the fluorine rubber lining for the hose, and in the santana, audi, jetta, fukang car use on model, etc.
High technology content in the car engine, transmission, valve oil seal on the selection of material mainly fluorine rubber, HNBR industry, etc.;Fluorine rubber and silicone rubber compound oil seal has become the most commonly used engine crankshaft oil seal.
Loading and unloading car hydraulic system, large loading and unloading car hydraulic system work continuously for a long time, the oil temperature and part temperature rises quickly, ordinary rubber can¡¯t meet the job requirements, and fluorine rubber products with its good heat resistance performance can meet all kinds of harsh technical requirements.
In addition to the auto industry application beyond, fluorine rubber seals are applied in drilling machine, oil refining equipment, natural gas and power plant, the desulfurization device, can also withstand high temperature and high pressure, the oil and strong corrosive medium and harsh conditions;In the chemical production in fluorine rubber seal is used in the pump, tube fittings, equipment of containers, for sealing inorganic acid, organic chemicals, etc.As plastics extrusion additives, polyethylene, polypropylene extrusion processing, low viscosity fluorine rubber can squeeze in that surface of mouth very thin film, thus increasing extrusion rate and make products obtain ideal appearance.In the space, building materials, machinery and so on many fields fluorine rubber also has a very important applications.