In recent years, with the rapid development of automobile industry, the temperature of automobile engine room increases, the use of modified fuel and strong corrosive engine fuel is more and more common, fluorine rubber heat shrinkable pipe is more widely used in automobile sealing protection than in the past.
In order to improve the power of the car engine, save fuel, ensure the safety of the car driving, the emergence of a new fuel injection system. In this system, the car flows from the tank into the engine and then back to the tank to circulate, and gasoline and oxygen are mixed to produce hydrogen peroxides. Gasoline containing hydrogen peroxide is called "acidic gasoline", which can soften or harden a variety of hydrocarbon rubber. and fluorine rubber will not be exposed to acidic gasoline resulting in deterioration and deterioration.
Every year, countries around the world enact new environmental protection regulations. The total hydrocarbon emissions of automobiles are increasingly restricted, and it is becoming increasingly difficult for the automotive industry to meet this requirement. In the United States, cars must be tested by shed (sealing box evaporation determination) test. Fluorine rubber has excellent barrier to hydrocarbon penetration, and the application of fluorine rubber heat shrinkable tube in the structure of fuel hose can reduce the permeability of hydrocarbon.
The products of the automotive fuel system must function normally in the temperature range of the -40℃~150℃. However, fluorine rubber with the increase of fluoride resistance to low-temperature performance deterioration (vitrification temperature rise), in order to manufacture in the -40℃ under the normal performance of products, it is necessary to improve the poor cold resistance of fluoride products. Today, perfluorinated ether rubber has been developed and marketed, effectively improving the low temperature performance of fluorine rubber, but at present due to price problems is difficult to popularize a lot.
The automotive industry is closely concerned with the methanol of fuels, and is eagerly engaged in the study of FFV (Flexible Fuel Vehicle), which may be adapted to any fuel, and the FFV of rubber parts is particularly urgent. When methanol is mixed with gasoline, the volume swelling of fluorine rubber is about 10%. However, in the case of methanol alone, due to the different fluorine content, the volume swelling difference of fluorine rubber is very large. When the fluorine content is high, there is almost no swelling, but with the decrease of fluorine content, the swelling in the low temperature area becomes larger, especially in the case of fluorine content of 66%, the volume swelling will increase significantly. This can be thought to be due to the proximity of the methanol binding produced by hydrogen bonds at low temperatures to the SP values of polymers with a fluorine content of 66%.
In a sense, fluorine rubber is also the product of growth with the progress and development of the Times. Although these materials are expensive, they have high practical value because of their excellent abrasion resistance, oil resistance and reliability, so it is not surprising that their dosage is gradually rising. The development of fluoride has great potential and possibilities, and it is expected that fluorine polymers with higher value will be developed in the future.
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