Modified formula for enhancing rapidly-dried silica sol

Abstract

The invention relates to a modified formula for enhancing rapidly-dried silica sol. The technical scheme is that: the modified formula consists of the following components in part by weight: 8,500 to 9,800 parts of silica sol, 100 to 1,200 parts of emulsion, 80 to 160 parts of fiber, and 20 to 180 parts of antifoaming agent. The modified formula has the advantages that: by using the interpenetrating and complementary characteristics of the silica sol and the emulsion, coatings coated on the surface of a wax mold are in net distribution, the wet strength of the coatings is improved, and the next-layer sizing agent can be applied to the incompletely dried upper-layer sizing agent; by using the water conduction function of the fiber, the water inside and outside the coatings is balanced, the inner stress is reduced, the mold shell cracking probability is reduced, the evaporation of the water is accelerated, and the drying time is shortened; an ultra-micro gap of the fiber formed by high temperature carbonization can reduce the retained strength of the mold shell, also can improve the air permeability of the mold shell, and comprehensively improves the quality of casting products; and the period of shell making technology is shortened from 5-7 days to 1-2 days.

Description

1. Technical field: [0001] The invention relates to the technical field of investment casting adhesives, in particular to an adhesive for mold shell materials in investment casting. 2. Background technology: [0002] The existing investment casting (precision casting) uses ordinary silica sol instead of ethyl acetate, which was very polluted in the early stage, as a binder for shell-making materials, which is clean and environmentally friendly and has been widely used. Due to the low wet strength of silica sol slurry, the operation of the next layer of slurry must be carried out after the bottom layer of slurry is fully dried. According to different drying conditions, the production cycle is generally 7-8 days, accounting for about 10% of the entire production cycle. 85%; if the temperature and humidity of the mold shell are not properly controlled during the drying or sintering process, cracking and deformation are likely to occur, resulting in unqualified castings; due to ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-efficiency, energy-saving and environmentally friendly quick-drying silica sol formula for the defects of low wet strength, high residual strength, and easy cracking of the existing ordinary silica sol.