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Fluorine Rubber Heat-resistant Oil Resistant Solvent

Edit:Anji Jiahe Fluorourubber Made Products Co.,Ltd      Date:Sep 04, 2017

Fluorine rubber refers to the main chain or side chain of carbon atoms connected to the fluorine atom of a synthetic polymer elastomer. This new polymer material has the characteristics of heat resistance, oil resistance, solvent resistance and strong oxidizing agent, and has good physical and mechanical properties. It is widely used in many fields such as national defense, military industry, aerospace, automobile, petrochemical and so on. At present, more than 60% of the world's fluorine rubber production for the automotive industry, fluorine rubber is its excellent performance continues to expand the scope of applications. [1] Viton is divided into vinylidene fluoride-based fluorine rubber (FKM), tetrafluoroethylene-propylene fluorine rubber (TFE-P), perfluoro rubber (ASTM name: FFKM), fluorosilicone rubber and fluorine-containing nitrile rubber Etc., in which the ordinary fluorine rubber represented by FKM contains a hydrocarbon group in the polymer, and under severe conditions such as attack in a chemical medium can cause deterioration of the rubber.

1. Overview of fluorine rubber

 For more than 30 years, fluorine rubber has maintained a large growth momentum. In the late 1960s, the annual growth rate of 20% to 30%, 70% growth in the 1970s, 80 years since the 7% to 8% growth rate, and this growth trend is expected to continue [3] The Fluorine rubber is widely used in the production of sealed products. According to reports, the United States 50% of the fluorine rubber for sealing products, Japan's application rate of 80%. Fluorine rubber has been applied throughout the scope of automotive, mechanical metallurgy, petrochemical, railway, aviation, aerospace, electronics and other departments, become indispensable to a high temperature, corrosion-resistant rubber material. So far, the world's annual output of about 15,000 tons of fluorine rubber. At present the world's largest production or 26-type fluorine rubber (equivalent to the United States DuPont's Viton A.Viton B), accounting for 90% of the total amount of fluorine rubber,

China has successfully developed in the 60's polyolefin-based fluorine rubber (23, 26, 246, TP-2 type), but also successfully synthesized the so-based nitroso fluorine rubber. In 1980 the development of perfluoroether rubber and fluoride fluoride eye rubber. These varieties of fluorine rubber are the first to aerospace, aviation and other national defense cutting-edge technology, military supporting the need to start, and gradually promote the application to the civilian industry sector, and its demand also with the national defense and national economic development and growing. At present, the production capacity and the actual needs are very inconsistent, very few manufacturers, not only low yield and variety of single, can not meet the needs of a variety of purposes. Therefore, the state every year to spend a lot of foreign exchange imports to meet domestic demand, many areas are directly imported fluorine rubber products.

2. The main performance of fluorine rubber

2.1 Physical properties of fluorine rubber

Fluorine rubber generally has a high tensile strength and hardness, but the flexibility is poor. Fluorine rubber friction coefficient of 0.80, smaller than the eye rubber (0.9-1.05) small, good wear resistance, but used as a dynamic seal, because there is a large movement speed, resulting in higher friction heat, so that wear Performance degradation.

2.2 Chemical properties of fluorine rubber

Fluorine rubber has a high heat resistance, can be 200 ~ 250oC long-term work, at 300oC can also be short-term application. In the anti-aging properties, fluorine rubber and silicone rubber is better than other varieties of rubber. The breaking strength and hardness of fluorine rubber decreased significantly with the increase of temperature. In the 150 ~ 260oC between the temperature rise with the slow decline. Based on the low breaking strength of fluororubber at high temperature, the fluorine rubber seal at high temperature should try to avoid the effect of non-assembly stress, so as to avoid early damage at high temperature. One of the characteristics of fluorine rubber is a very excellent corrosion resistance. It is superior to other rubber in terms of the stability of organic liquids (hydraulic media, fuel oil, solvents, etc.), concentrated acids and strong oxidants. In particular, perfluoroether rubber and nitrofluoroethylene rubber have exceptional corrosion resistance.

According to statistics, more than 50% of the fluorine rubber for sealing products, compression deformation is a major performance. DuPont has been committed to improving the compression deformation performance, its product compression deformation in 1964 when more than 80%, to 1973 has been significantly reduced by 13%. 26 type fluorine rubber cold resistance is poor, the flexibility to maintain the ultimate temperature of -15 ~ -20e. DuPont developed the United States Viton GLT, its low temperature performance has been improved, can be applied to the seal under the -54e, Alaska oil field with low temperature sealing material. Specific ultra-low temperature seal, sometimes with fluorine rubber. Fluorine rubber has a very low permeability, in high temperature, high vacuum conditions, with a very small amount of gas volatilization (weight loss), therefore, its high vacuum performance is particularly good. Fluorine rubber is very stable for sunlight, ozone and weather. Vulcanized rubber after 10 years of natural aging, but also to maintain good performance. Fluorine rubber and fire contact can burn, but leave the fire after the extinguished, it is self-extinguishing rubber. The fluorine rubber has an oxygen index of 61 to 64.

3. Application of fluorine rubber

Perfluorinated rubber is a high-performance high-priced sealing material, so far, it is still the world's most expensive compound. In recent years, its application from the beginning of the development of military, aerospace and other cutting-edge technology, and gradually extended to the electronics, pharmaceutical, chemical and other civilian areas.

In general, the total life cost of the seal is not only to consider the purchase price of the seal, but also to consider the life and failure, downtime, maintenance losses. In many cases, the high reliability of the perfluoro rubber is sufficient to justify the use of it because of the loss of parking and the cost of removing and reassembling the equipment. This does not take into account the long use times it normally has. Table 6 lists some areas of application of perfluoroelastomers. In these areas, perfluorinated rubber is increasingly used as an O-ring, film, seal ring, sheet (including reinforced sheet), tubes, tapes and special conventional molded parts.

3.1 Semiconductor products

The excellent performance of perfluorinated rubber makes its application deep into the entire manufacturing system of semiconductor products. In this rapidly evolving field, the reliability of the elastomer gasket is critical and the cost of replacing the gasket is extremely high, so every advantage of the FFKM is fully utilized here: chemical resistance, thermal stability, low Extraction, low permeability and low release of gas performance, these are very important. At present, the semiconductor manufacturing industry has the greatest demand for perfluorinated rubber. For example, waterless etching requires doors and windows, as well as exhaust valves can withstand highly corrosive chemicals; in the optical masking process, the filter, the coupling of the gasket and the valve also has a similar need ; Plasma CVD (ie, chemical vapor deposition) process, the vacuum chamber, box cover and other gas used in the gas must be able to withstand the destruction of the plasma; in the cathode vacuum and spray method, the gasket requires a minimum degree of leakage rate.

A semiconductor fixture manufacturer will be able to withstand chemical plasma attack several possible materials made of gasket, a large number of tests, the results shown in Table 7 (test methods and conditions slightly). The post-test visual inspection revealed that the perfluorinated rubber samples maintained a smooth surface condition, indicating that the material did not undergo significant decomposition. In fact, all tested perfluorinated rubbers are not significantly damaged, while the fluorine rubber and silicone rubber are completely decomposed.

3.2 Application of fluoroelastomer in automobile

3.2.1 Fluorine rubber material inside the fuel hose

With the introduction of lead-free cars and EFI devices in the car to promote the use of fuel hose structure and material changes, the inner layer has been developed with fluorine rubber instead of nitrile rubber, in order to reduce fuel permeability and further improvements Heat resistance, the inner layer of multi-use composite structure, that is, fluorine rubber and chloroprene rubber or acrylic rubber composition, due to the high price of fluorine rubber, fluorine rubber layer is relatively thin, are 0.2 ~ 0.7mm, this structure Fuel hose has become a foreign auto parts used in the mainstream products.

3.2.2 turbocharger hose

Turbocharger Hoses are one of the most demanding and costly hoses in automotive engines. The high cost of the hose is because the design of the hose requires a large number of hose layers, and in order to ensure the normal flow of the liquid, the cost of the required elastomer is also high. Previously, many of the use of AEM and other acrylic rubber hose has been changed to the use of silicone rubber, so that the hose at a higher temperature to maintain a stable performance. In this way, it is desirable to use a fluoroelastomer liner to provide the necessary oil resistance.

3.2.3 Engine oil seal

People used to use nitrile rubber to make oil on the engine. Nitrile rubber low cost, but the high temperature and high speed performance is poor, when the temperature exceeds 120oC or rotating shaft speed of more than 5000r / min or more, the oil seal lip aging and hardening, brittle, resulting in leakage. In the early 1990s, foreign companies have successfully developed a filled polytetrafluoroethylene (PTFE) oil seal that is widely used in internal combustion engines (especially high-power, heavy-duty internal combustion engines). Domestic introduction or joint venture production of Cummins and Caterpilar diesel engine and so on with polytetrafluoroethylene oil seal instead of the previous use of nitrile rubber and fluorine rubber and other lip rubber seal oil seal. As its crankshaft, auxiliary drive shaft and other rotary oil seal, successfully solved the engine due to oil seal seal is not good and leakage, oil leakage problem.

3.2.4 loading and unloading truck hydraulic system

In the field of chemical industry, many fluids contain strong acid, alkali or strong corrosive, conventional large-scale loading and unloading truck hydraulic system to be coated with a corrosion-resistant material in the wall can be used to transport them. Polytetrafluoroethylene because of a very high inertia, completely with aqua regia, hydrofluoric acid, concentrated sulfuric acid, nitric acid hydrogen peroxide and other effects, is an ideal anti-corrosion equipment lining material. The traditional polytetrafluoroethylene liner is a "steel-fluorine" two-body separation structure, and therefore there is a drawback that the lining is deflated due to the negative pressure of the pipe or the temperature of the medium caused by the fatigue failure of the polytetrafluoroethylene layer.

4. Concluding remarks

Polyolefin fluorine rubber varieties, products with good performance, with high temperature, strong corrosion resistance and so on. After several decades of improvement, the new fluorine rubber varieties and with auxiliaries (curing agent, co-vulcanizing agent) continue to appear to improve the process, so that in a variety of military, civilian products have been increasing applications.

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