A kind of pva boiling method

Abstract

The invention discloses a PVA (Polyvinyl Acetate) decocting method. The method comprises the steps of calculating; adding water; adding PVA; continuously adding water, and marking a water level; heating; stirring; cooling; removing rubber skin and preserving heat; replenishing water; stirring. According to the method, the water is added before and after the addition of the PVA, so that the PVA is prevented from being in direct contact with the inner wall of a heating stirrer, and the phenomenon that the PVA is bonded on the inner wall is prevented. Thus, the PVA powder is in full contact with water and can be sufficiently swelled below 35 DEG; meanwhile, the PVA is prevented from fluttering when stirred, so that the pollution to the environment is avoided. In addition, the water-bath heating is adopted, so that the heating is carried out more uniformly; meanwhile, the generation of air bubbles is reduced at the same time. Furthermore, the water is replenished before the application of the PVA, so that the water evaporation is prevented; the concentration of a PVA solution is influenced, namely that the constant concentration of the PVA solution is maintained. Therefore, the constant adding amount of the PVA is maintained.

Description

technical field [0001] The invention relates to a preparation method of a glue solution, in particular to a PVA boiling method. Background technique [0002] As an excellent adhesive, PVA is widely used in powder making or ceramic industry. In order to make the powdery powder spherical and granular and facilitate the subsequent molding and pressing, a PVA binder with a specified concentration is added before spraying and pelletizing. The final addition amount of PVA adhesive must be strictly controlled. If the addition amount is small, it will be difficult to form the required particle shape and shape; A large amount of volatilization will cause cracking, resulting in the scrapping of batch products. The amount of PVA added is controlled by the PVA concentration. When PVA is boiled, the PVA concentration will change due to uneven heating or volatilization of moisture in the mixer, making it difficult to control the amount added. Contents of the invention [0003] The te...

AI Technical Summary

Problems solved by technology

The final addition amount of PVA adhesive must be strictly controlled. If the addition amount is small, it will be difficult to form the required particle shape and shape; A large amount of volatilization, resulting in cracking, resulting in the scrapping of batch products

The amount of PVA added is controlled by the PVA concentration. When PVA is boiled, the PVA concentration will change due to uneven heating or moisture volatilization in the mixer, making it difficult to control the amount of PVA added.