Low-contraction acrylic acid ester vacuum infiltration agent used for sealed reinforcement

Abstract

The invention discloses a low contraction acrylic acid ester vacuum infiltration agent used for sealed reinforcement, which contains a monofuctional acrylate monomer, a difunctional acrylate monomer, a reaction emulsifier, inorganic rigid particles, an organic anti-contraction agent, an initiator and a polymerization inhibitor, the vacuum infiltration agent is obtained by uniformly mixing the above components under normal temperature, appearance of the vacuum infiltration agent is a colorless transparent oily liquid, proportion is 0.950-1.100kg / m<3>, gelling time is 240-360s, viscosity is less than 10.03mPa.s, the glue rod hardness after solidification is greater than 85Shore A, and the volume shrinkage before and after solidification is less than or equal to 9.00%. The infiltration agent has the advantages of low viscosity and little toxicity, gelling time and glue rod hardness after solidification can satisfy the requirement of industrial production, the vacuum infiltration agent has low volume shrinkage, has capability for plugging large micro apertures with high efficiency, the efficiency for plugging the micro aperture at one time is high, and the vacuum infiltration agent is the ideal infiltration agent for sealed 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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