In addition to the conventional production process of recycled fluoroplastics, it should have a cross-linking process (similar to cross-linked heat shrinkable tubes) in the blank making process, so that independent molecular chains are connected into a whole through chemical bonds to ensure that they are not melted and deformed during preheating before blowing. It can return to its original shape and size when heated after inflation. At present, at home and abroad, crosslinking usually uses electron accelerator to generate electron beam to complete, also uses drill radioactive source to carry out crosslinking, also uses gamma ray to complete the gel content of normal blank tube after irradiation is more appropriate. Whether the equipment is advanced or not in the processing of fluorine plastics is the key to product quality. At the same time, different processing methods, the equipment used is also different.

The main equipment of heat shrinkable tube is the main equipment of blade pressing and forming tube blank forming machine (press) and other auxiliary equipment. Heat shrinkable tube inflation molding equipment using mechanical inflation process when the equipment is relatively simple, but this method of production of inflation tube, the length is limited, production for intermittent, production capacity is not large. There are mainly umbrella core molds. Different specifications have different core molds heating devices for heating blank tubes, namely heating furnaces or ovens. All core molds and other components are also installed in the furnace,Recycling fluoroplasticsManufacturers through automatic or manual operation in the furnace at a time.

The main equipment used in the inflatable blowing process includes compressor air supply and blow mold sizing sleeve heating equipment. In addition to the oven, there is also a set of special equipment designed according to actual needs to install the blow mold sizing sleeve and other auxiliary equipment in it, which is non-stereotyped equipment. Fluorine resin due to its excellent weather resistance, heat resistance and chemical resistance has been recycled fluorine plastic manufacturers are familiar with, but the fluorine resin is not soluble in commonly used solvents, to its coating has brought great difficulties. Fluorinated copolymers with vinyl fluoride as the main comonomer and vinyl ether or vinyl ester as the main functional group are widely used because of their excellent chemical properties of fluororesin and coating properties of general-purpose coatings. At the end of the 1970 s, a number of Japanese companies, led by Asahi Nitro, Japan, began to develop soluble room temperature curing fluorine coating resins. Among them, the first to be commercialized and widely recognized for use is the Lumiflon of Japan's Asahi Nitro Company. In 1993, its output reached 2500t/a and increased at an annual growth rate of about 30.

In the molecular structure of Lumiflon, chlorotrifluoroethylene as the main monomer, due to its maximum electronegativity of fluorine atom and small atomic radius, the C- F bond formed by chlorotrifluoroethylene and carbon atom is extremely short, the bond energy is relatively high (486KJ/mol), which is much larger than the bond energy of C- H bond and C- C bond. From the perspective of space structure and chemistry, fluoroolefin unit protects the unstable vinyl ether unit, it is difficult to be attacked by oxidation, improves the weather resistance and chemical resistance of the resin, and provides the necessary hardness for the resin. Recycled fluoroplastics manufacturers introduced cyclohexyl, so that it can be dissolved in most organic solvents at room temperature. The flexibility of the resin is increased. The resin has the properties of curing in a wide temperature range from room temperature to high temperature, and the application range is greatly expanded. The wettability of the resin to the pigment is improved, and the compatibility of the resin with the curing agent and the organic pigment is increased.

This article comes from:www.tflpfa.com

Popular Articles:Not all fluoroplastics can be recycled.