Preparation of hydroxyethylmethylcellulose(HEMC)


Background and overview Fibrotoxic ether is a versatile polymer fine chemical material made from natural polymer cellulose through chemical chemistry.

After the production of cellulose in the 19th century and cellulose acetate in the 19th century, chemists have developed many series of cellulose derivatives, new application fields, and involving many industrial sectors, fiber toxic ether products such as sodium (CMC) .

Its cellulose (TEC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), methyl hydroxyl 7 based cellulose (MHEC) and methylhydroxypropyl cellulose (MHPC) are known as: “industrial monosodium glutamate”, has been widely used in oil drilling, construction, coatings, food, medicine and daily chemicals.

Hydroxyethylmethyl cellulose (MHPC) is a tasteless, tasteless, non-toxic white powder that dissolves dry cold water to form a transparent sticky solution.With thickening, adhesion, dispersion, emulsification, film, suspension, adsorption, coagulation, surface activity, keep water and protect colloid, by dry water solution has surface activity, can be used as colloidal protective agent, multinator and dispersant, hydroxyl

Its cellulose water volume has good hydrophilic, is a high water retention, hydroxy.

Its fiber toxicity contains hydroxyl b, its group, so has good mildew resistance, long-term storage has good viscosity stability and mildew resistance.

Hydroxyethylmethyl cellulose (HEMC) is made by introducing cyclic hydroethyl (MS 0.3~0.4) in methyl cellulose (MC).

Its salt resistance is better than the unmodified polymer, and the gel temperature of its cellulose is higher than that of MC.

Apply Hydroxyethyl methylcellulose can be used as a hydroidal protective agent, emulsifier and dispersant due to the surface active function of aqueous solution.Examples of its application are as follows.

Base methyl cellulose influence on cement properties.

Hydroxyethylcellulose is a free, tasteless, non-toxic white powder.It can dissolve dry cold water and form a transparent and sticky solution

Because aqueous solution has surface activity function

it can be used as colloidal protective agent, emulsifier and dispersant.Hydroxy, base methyl cellulose aqueous solution has good hydrophilic, is a high water retention agent.

Prepare a relief paint with high flexibility, Made of the following weight parts of raw material: deionized water 150-200q.

Pure C emulsion 60-70q;

Heavy calcium: 550-650q; Talc powder 70-90g;

Hydroxyethylmethylcellulose aqueous solution 30-40q;

Lnocellulosic aqueous solution 10-20q;

Membrane-forming additives: 4-6g;

Antiseptic and fungicide 1.5-2.5q;

Dispersant agent 1.8-2.2q;

Moisture agent 1.8-2.2q;

Thickener, 3.5-4.5q;

Ethylene glycol 9-11g;

The hydroxyethylmethylcellulose solution is made of 2-4% hydroxyethylmethyl cellulose dissolved in water;

The lignocellulosic aqueous solution is made of 1-3% lignocellulose in dissolved dry water.

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