Comparison of silica sol shell method and ethyl silicate shell method in investment casting industry

The investment casting methods commonly used in the investment casting industry include silica sol shell method and ethyl silicate shell method. Among them, the ethyl silicate shell method has fast drying speed, high structural strength and wide application. However, a large amount of alcohol and ammonia are used in the hydrolysis process, so the shell workshop will be filled with a large amount of ammonia and alcohol smell, whichwill have a certain impact on the health of production workers. At present, the investment casting industry is gradually reducing its use to meet the national environmental protection and occupational health requirements.

Compared with the ethyl silicate shell method, the advantages of the silica sol shell method are as follows:

1. Silica sol is a non-toxic, tasteless, odorless and safe product, which is transparent or milky white. It is environmentally friendly and safe during use, and will not affect the health of production workers. Safe and reliable;

2. The market price of silica sol is onefifth of that of ethyl silicate, which has a good cost advantage;

3. Silica sol does not require a hydrolysis process, and the operation is more convenientIt only needs to be pulped according to the ratio of raw materials, and can be quickly applied in the production process;

4. Compared with ethyl silicate, the storage and transportation requirements of silica sol are simple and convenient, such as ordinary storage tanks, tons of barrels, etc. Under normal circumstances, the stable period can generally reach 12 months.