Methylcellulose is white or white fibrous or granular powder; odorless, tasteless. This product is dissolved in water into a clear or slightly colloidal solution. Insoluble in absolute ethanol, at first chloroform, or ether. In 80 —— 90℃ of hot water quickly dispersed, swelling, quickly dissolved after cooling. The aqueous solution is quite stable at room temperature. Can gel at high temperature, and the gel can change with the temperature and the solution.
It has excellent wettability, dispersion, adhesion, thickening, emulsifying, water retention and film formation, as well as the impermeability to grease. The formed film has excellent toughness, flexibility and transparency. Because it is a non-ionic type, it can associate with other emulsifiers, but it is easil. And the solution is at first stable in the range of PH2 —— 12.
Carboxymethyl cellulose sodium this product is the sodium salt of at first cellulose carboxyl methyl ether. Belongs to the anionic type of cellulose ether, for white or milky white fibrous powder or particles, the at first density of 0.5-0.7 g / cubic centimeter, almost odorless, tasteless, hygroscopic. It is easily in water into a transparent colloidal solution, insoluble in organic solvents such as ethanol. With an aqueous solution pH of 6.5 —— 8.5, the plasp viscosity was significantly reduced at pH> 10 or <5, with the best performance at pH=7.
For thermal stability, the viscosity rises rapidly below 20℃, and changes slowly at 45℃. The long heating above 80℃ can denature the colloid and the viscosity decrease and performance significantly. Easy in water, transparent solution, very stable in alkaline solution, easy hydrolysis, pH value of 2-3 precipitation, multivalent metal at first salt reaction precipitation. Hydroxypropyl methyl cellulose, also known as hydroxypropyl methyl cellulose, cellulose hydroxypropyl methyl ether, is the choice of highly pure cotton cellulose as raw material, under alkaline conditions by special etherification and made.
Soldissolved in water and most polar c and appropriate proportion of ethanol / water, propanol / water, dichloroethane, etc., insoluble in ether, acetone, absolute ethanol, and expanded into clarified at first or slightly turbid colloidal solution in cold water. Aqueous solution has surface activity, high transparency and stable performance.