High-temperature-resistant sealing gasket used for casting

Abstract

The invention relates to the field of sealing gaskets, in particular to a high-temperature-resistant sealing gasket used for casting. The high-temperature-resistant sealing gasket comprises rubber layers and a metal layer and is characterized in that a hard layer is arranged between the two rubber layers and connected through an adhesive; the hard layer is prepared from, by weight, 50-70 parts of quartz sand, 20-30 parts of ferric oxide, 5-7 parts of titanium and 6-8 parts of nickel; each rubber layer is prepared from, by weight, 100-110 parts of acrylate, 10-20 parts of carbon black, 2-3 parts of accelerant, 50-60 parts of tetrapropyl fluoro rubber, 5-9 parts of dicumyl peroxide, 6-11 parts of calcium sulfate, 11-15 parts of nanometer argil, 2-4 parts of tributyl citrate, 2-5 parts of glass fiber, 8-12 parts of bauxite powder, 1-2 parts of potassium fluoroaluminate, 13-16 parts of silicon dioxide powder, 0.5-2 parts of scorch retarder, 1-2 parts of antioxidants, and 1-2 parts of antiager. Good performance of the sealing gasket can be kept for a long time at high temperature.

Description

Technical field: [0001] The invention relates to the field of gaskets, in particular to a high-temperature-resistant gasket for casting. Background technique: [0002] Gaskets generally pay attention to the following conditions: high elasticity and resilience; appropriate mechanical strength, including expansion strength, elongation and tear strength, etc., stable performance, not easy to swell in the medium, heat shrinkage effect (Joule effect) It is small, easy to process and shape, and can maintain precise dimensions, does not corrode the contact surface, does not pollute the medium, etc. At present, in casting production, the sealing of the pouring system and the sand box must be strictly handled, which requires the use of gaskets. When exposed to high temperature for a long time, the elasticity and hardness of general gaskets will gradually decrease, and the sealing effect will become worse and worse. Invention content: [0003] The technical problem to be solved by ...

AI Technical Summary

Problems solved by technology

[0002] Gaskets generally pay attention to the following conditions: high elasticity and resilience; appropriate mechanical strength, including expansion strength, elongation and tear strength, etc., stable performance, not easy to swell in the medium, heat shrinkage effect (Joule effect) It is small, easy to process and shape, and can maintain precise dimensions, does not corrode the contact surface, does not pollute the medium, etc. At present, in casting production, the sealing of the pouring system and the sand box must be strictly handled, which requires the use of gaskets. When the temperature is very high, if exposed to high temperature for a long time, the elasticity and hardness of the general gasket will gradually decrease, and the sealing effect will become worse and worse.