Ash content requirement of hydroxypropyl methyl cellulose HPMC

Hydroxypropyl methyl cellulose HPMC is mainly used for thickening, emulsifying, film forming, colloid protection, water retention, adhesion, enzyme resistance and metabolic inertia, etc. It is widely used in many fields of industry, which can be roughly divided into the following aspects:

(1) Construction: the main role is to retain water, thickening, viscosity, lubrication, flow to improve cement and gypsum workability, pumping. Architectural coatings, latex coatings are mainly used as protective colloid, film forming, thickening agent and pigment suspension aid.

(2) POLYvinyl chloride: mainly used as a dispersant in the polymerization reaction of suspension polymerization system.

(3) daily chemicals: mainly used as protective articles, it can improve the product emulsification, anti-enzyme, dispersion, bonding, surface activity, film forming, moisturizing, foaming, forming, release agent, softener, lubricant and other properties;

(4) pharmaceutical industry: in the pharmaceutical industry is mainly used for preparation production, as a solid preparation of coating agent, hollow capsule capsule material, binder, for the framework of sustained release agents, film forming, pore-causing agent, as a liquid, semi-solid preparation of thickening, emulsification, suspension, matrix application;

(5) ceramics: used as bonding forming agent of ceramic industrial blank, dispersant of glaze color;

(6) paper: dispersion, coloring, strengthening agent;

(7) Textile printing and dyeing: cloth pulp, color, color extension agent:

(8) in agricultural production: used in agriculture to treat crop seeds, can improve germination rate, can moisturize and prevent mildew, fruit preservation, sustained release of chemical fertilizers and pesticides.

From the feedback of the above long-term application experience and the summary of internal control standards of some foreign and domestic enterprises, it can be seen that only some products of PVC polymerization and daily chemical products require salt control < 0.010, and the pharmacopoeia of various countries requires salt control < 0.015. And other uses of salt control can be relatively wider, especially construction grade products in addition to the production of putty, coating salt has certain requirements outside the rest can control salt < 0.05 can basically meet the use.