Fluororubber is a kind of rubber material widely used in various fields, which has excellent high temperature resistance, chemical corrosion resistance and oil resistance. However, the performance of fluorine rubber at low temperatures has been a problem. At low temperatures, fluorine rubber is easy to harden, become brittle, and even crack. This limits its use in some low-temperature environments. This paper will introduce several methods to improve the low temperature performance of fluorine rubber.
First, blending modification
Blending modification is a method by which two or more rubber materials are mixed together to improve their properties. By blending fluorine rubber with other rubber materials (such as silicone rubber, EPDM rubber, etc.), the low temperature performance of fluorine rubber can be significantly improved. Compatibility between these rubber materials is very important, so it is necessary to choose the right blend and ratio.
Second, filler modification
Filler modification is to improve the properties of fluorine rubber by adding some inorganic or organic fillers. Some common fillers include diatomaceous earth, nano-calcium carbonate, mica powder, etc. These fillers can enhance the mechanical properties of fluorine rubber and improve its low temperature resistance. The low temperature performance of fluororubber can be optimized by selecting the appropriate filler and adding amount.
3. Radiation crosslinking
Radiation crosslinking is a method of triggering rubber molecules to cross link by irradiation with high-energy rays. The hardness and low temperature resistance of fluorine rubber can be improved by radiation crosslinking. Radiation crosslinking can also improve the high temperature resistance and chemical corrosion resistance of fluorine rubber. However, dose and temperature control during radiation crosslinking is very important, otherwise it may negatively affect the properties of fluororubbers.
4. Graft modification
Grafting modification is to improve the properties of fluororubber by grafting some branch chains or functional groups on the molecular chain. These branched chains or functional groups can provide additional physical crosslinking points, improving the hardness and low temperature resistance of fluoroprubber. The graft modification can be achieved by chemical method or radiation method. The low temperature performance of fluorine rubber can be optimized by selecting suitable grafting monomer and conditions.
Five, nano composite material modification
Nano-composite material modification is to improve the properties of fluororubbers by combining them with some nanomaterials. These nanomaterials can provide additional physical crosslinking points and reinforcing effects to improve the hardness and low temperature resistance of fluororubbers. Some common nanomaterials include nano silica, nano carbon tube, nano oxide and so on. The low temperature performance of fluororubbers can be optimized by selecting suitable nanomaterials and ratio.
In short, there are many ways to improve the low temperature properties of fluororubbers, including blending modification, filler modification, radiation crosslinking, graft modification and nanocomposite modification. These methods can be used alone or in combination to optimize the low temperature properties of fluororubbers. However, each method has its advantages and disadvantages and scope of application, so it is necessary to choose the appropriate method according to the specific needs in practical application.
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