Fluororubber/polyhydroxy fluororubber-based polyurethane interpenetrating network reinforcing material and preparation method thereof

Abstract

The invention discloses a fluororubber / polyhydroxy fluororubber-based polyurethane interpenetrating network reinforcing material and a preparation method thereof. The fluororubber / polyhydroxy fluororubber-based polyurethane interpenetrating network reinforcing material is prepared from the following components in percentage by weight: 30-95% of fluororubber, 3-40% of polyhydroxy fluororubber, 2-30% of polyisocyanate and 0.001-1% of a polyurethane gel type catalyst. The preparation method can be a solution blending-coating drying-heating curing method, and can also be a melt blending-shaping-heating curing method. Compared with a traditional fluororubber reinforced modification method, the preparation method has the advantages that through curing of the polyhydroxy fluororubber, the crosslinking temperature of the fluororubber can be greatly reduced to 60-100 DEG C, and various properties of the material can be flexibly designed by adjusting the content and variety of the polyhydroxy fluororubber, so that the properties such as mechanical property, creep resistance, hardness, toughness and low temperature resistance of the fluororubber are improved.

Description

technical field [0001] The invention relates to the technical field of fluororubber reinforcing materials, in particular to fluororubber / polyhydroxyl fluororubber-based polyurethane interpenetrating network reinforcing materials and a preparation method thereof. Background technique [0002] Fluorine rubber has a series of excellent properties such as good chemical medium resistance, heat resistance and oil resistance, and is widely used in national defense, automobile, aerospace, petrochemical and other fields. However, compared with other rubbers, the strength and toughness of fluorine rubber are average, such as: higher tensile strength, lower elongation at break, and average tear performance. At present, the commonly used reinforcing fillers in fluororubber formulations are mostly inorganic carbon black, white carbon black, calcium fluoride, barium sulfate, talcum powder, mica powder, diatomaceous earth, calcium silicate, graphite, clay and magnesium silicate. The addit...

AI Technical Summary

Problems solved by technology

At present, the commonly used reinforcing fillers in fluororubber formulations are mostly inorganic carbon black, white carbon black, calcium fluoride, barium sulfate, talcum powder, mica powder, diatomaceous earth, calcium silicate, graphite, clay and magnesium silicate. The addition of such reinforcing fillers will increase the hardness of the vulcanized rubber and reduce the elongation at break while enhancing the tensile strength and tear strength of fluororubber. That is, the commonly used reinforcing fillers cannot balance the fluorine Improve the hardness, toughness and strength of rubber, and greatly increase the viscosity of the system, thereby increasing the difficulty of processing

Another commonly used reinforcement method is to use amines, phenols, organic peroxides and other substances to cure for a long time at around 180°C, which brings inconvenience to processing and consumes a lot of energy.

The above status limits the application of fluorine rubber under certain circumstances.

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