Low-shrinkage acrylic ester type vacuum impregnation agent for sealing reinforcement

Abstract

The invention discloses a low-shrinkage acrylic ester type vacuum impregnation agent for sealing reinforcement. The impregnation agent is prepared by uniformly mixing a mono-functionality acrylate monomer, a bifunctionality acrylate monomer, a reactive emulsifier, inorganic rigid particles, an organic anti-shrinkage agent, an initiator and a polymerization inhibitor. The appearance of the impregnation agent is colorless and transparent oily liquid; the specific gravity is 0.950-1.100kg / m<3>; the gelation time lasts for 240-360 seconds; the viscosity is smaller than 10.03mPa.s; the hardness of cured gel bar is greater than 85Shore A; the volume shrinkage rate before and after curing is less than or equal to 9.00%. The impregnation agent is low in viscosity and low in toxicity; the gelation time and hardness of the cured gel bar can meet the requirements of industrial production; the impregnation agent is low in volume shrinkage rate, and large micropores can be efficiently plugged by the impregnation agent; the impregnation agent is high in efficiency of plugging the micropores at one time; the impregnation agent is an ideal impregnation agent for metal sealing reinforcement.

Description

technical field [0001] The invention relates to a low-shrinkage acrylate type vacuum impregnating agent for sealing reinforcement. Background technique [0002] In industrial production, pressure-bearing sealing castings occupy a relatively large proportion. During the casting process of metal castings, defects such as internal looseness, pores and inclusions are prone to occur, resulting in products being scrapped due to leakage and air tightness that do not meet the requirements for use. According to statistics, the rejection rate of castings can be as high as 6 to 20%, and the rejection rate of some castings that are subjected to gas and hydraulic pressure, such as cylinder heads and valve bodies, can reach more than 30%. These defects are generally not easy to detect, and can only be found after pressure testing after machining, resulting in a serious waste of labor, raw materials, and energy; If it enters the pores, it will cause internal corrosion and shorten the ser...

AI Technical Summary

Problems solved by technology

These defects are generally not easy to detect, and can only be found after pressure testing after machining, resulting in a serious waste of labor, raw materials, and energy; Into the pores, resulting in internal corrosion, shortening the service life, or bubbles or unevenness in surface treatment processes such as electroplating and painting due to the existence of micropores, resulting in product quality defects

Such a gap will reduce the airtightness of the casting, cannot improve the situation of point leakage and line leakage, weaken the effect of the impregnation process, and cannot fully meet the needs of industrial production; the solvent is also easy to enter the gap between the glue column and the pore wall due to capillary action. In the gap, compared with when the solvent is completely blocked, the solvent can only contact the casting wall from the end face. In this case, the contact area is larger, which is more likely to accelerate the corrosion of small holes in the casting, reduce the service life of the casting and bury safety hazards

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