Fluororubber preparation method capable of modifying

Abstract

A modified preparation method for fluorine rubber comprises the following steps: nano tin dioxide powder with the particle diameter ranging within 10 to 50nm and the purity of above 99.0 percent is used as the enhancing and heat-resistant filler of fluorine rubber; the weight of fluorine premixing rubber is counted as 100 parts, the weight parts of the nano tin dioxide is 3 to 40, the fluorine premixing rubber and the nano tin dioxide are put into an internal mixer for mixing, or the fluorine premixing rubber is first plasticized for 5min on a mill and then the nano tin dioxide is added in accordance with the ratio for mixing; when the mixing is finished, the roller space of the mill is adjusted to 0.5 to 1mm, and then the mixing rubber is grinded for 6 to 7 times; next, when the roller space is enlarged to about 2mm, the film is taken down and parked; finally, modified fluorine rubber can be obtained; under the room temperature, the tensile strength of the modified fluorine rubber isenhanced by 28 percent than the tensile strength before the modification; after being aged for 48h in hot air at 250 DEG C, the tensile strength of the modified fluorine rubber is improved by 12 percent than the tensile strength before the modification; and the tensile strength of the modified fluorine rubber is increased by 30 percent than the tensile strength before the modification after beingaged for 48h in sea water at 70 DEG C.

Description

technical field [0001] The invention belongs to the technical field of non-metallic materials, and in particular relates to a method for preparing a modifiable fluororubber. Background technique [0002] Due to the special molecular structure and high chemical inertness of fluorine rubber, there are very limited ways to chemically modify it to improve its mechanical and medium resistance properties. In some applications with high strength requirements, the existing common brands of fluororubber can no longer meet the requirements of use, so it is necessary to use physical means to modify to improve its application performance. [0003] Chinese patent 94195024.7 introduces a fluororubber composition and molded products. This patent uses 0.1-5 parts by weight of fatty acid monoamide relative to 100 parts by weight of fluororubber to improve the mold release properties of fluororubber products. It has no effect on improving the mechanical properties of the product. [0004] C...

AI Technical Summary

Problems solved by technology

In some applications with high strength requirements, the existing common brands of fluororubber can no longer meet the requirements of use, so it is necessary to use physical means to modify to improve its application performance

[0003] Chinese patent 94195024.7 introduces a fluororubber composition and molded products. This patent uses 0.1-5 parts by weight of fatty acid monoamide relative to 100 parts by weight of fluororubber to improve the mold release properties of fluororubber products. No improvement on the mechanical properties of the product

[0004] Chinese patent 200510029059.4 introduces a high-hardness fluororubber compound with low-temperature flexibility. This invention only improves the wear resistance of the product, and does not affect the mechanical properties.

[0006] The above technologies only partially involve or do not involve the mechanical and mechanical properties of fluororubber, but the main mechanical and mechanical properties such as tensile strength and medium resistance of fluororubber are not involved, so the modification of fluororubber can greatly improve its mechanical and mechanical properties and Media resistance is particularly important