Overview Introduction of Hydroxypropyl methyl cellulose（HPMC）

Identification

Product Name:    Hydroxypropyl methyl cellulose    

Synonyms:  hpmcd;hydroxylpropylmethylcellulose;Hydroxymethylpropylcellulose;isoptoalkaline;isoptoplain;isoptotears;methocele,f,k;HydroxypropylMethylCellulose(Hpmc)    

CAS:    9004-65-3    

MF:    C3H7O

MW:    59.08708

EINECS:    618-389-6

Properties

Melting point 225-230 °C

Density 1.39

Solubility H2O: 50 mg/mL, clear to very faintly turbid, faintly yellow

Form powder

Color White to cream

Odor Odorless

Water Solubility SOLUBLE

Description

Cellulose is a natural substance normally present in most diets because it is the major structural carbohydrate of green plants. Cellulose is essentially a linear polymer of glucopyranose units connected by (3-1,4-glucoside links. In nature, cellulose is present in plant cell walls as fibers. The molecular weight of isolated cellulose is approximately 50,000. The principal sources of cellulose for food related purposes are cotton linters and wood pulp. Chemical processing converts cellulose into forms or derivatives suitable for incorporation into food products, or for use in food packaging materials. Hydroxypropylmethyl cellulose is synthesized from methyl cellulose by the action of alkali and propylene oxide. The resultant product is a water soluble ether derivative of cellulose containing both methoxy and hydroxypropyl groups. The degree of substitution is 1.08 to 1.83 with the hydroxypropyl groups as the minor constituent. It is used as a thickening agent, stabilizer, and emulsifier.

Uses

1. Thickener, stabilizer, emulsifier, emulsifier, suspending agent.

2. It is used as a synthetic resin dispersing agent, and the coating agent,also used as a thickener.

3. This product is used as a thickener, dispersant, binder, emulsifier and stabilizer in the textile industry. It is also widely used in synthetic resin, petrochemical, ceramics, paper, leather, medicine, food, cosmetics and other industries.

4. Used in synthetic resin, petroleum chemical industry, ceramics, paper, leather, textile, medicine, food, cosmetics and other daily chemicals and as dispersing agent, thickening agent, binders, excipients, capsules, oil resistant coating and packing etc.

Production Method

1.The refined cotton cellulose with alkali treatment at 35-40 ℃ for half an hour, press, crushed the cellulose, aging at 35 ℃, so that the average degree of polymerization of alkali cellulose is in a desired range. The alkali fiber into etherification reactor, followed by adding epoxy propane and methane chloride, etherification at 50-80 ℃ for 5h, the maximum pressure is about 1.8MPa. The reaction products were produced by postprocessing (hydrochloric acid and oxalic acid, washing and drying). The consumption of raw material of cotton pulp 1100kg/t, methyl chloride and propylene oxide 4300kg/t, solid alkali 1200kg/t, hydrochloride 30kg/t, oxalic acid 50kg/t.

2.100 kg refined cotton linters immersed in 45% solution, temperature is 35 to 40℃, time is 0.5 to 1 h, and then remove the press. The pressure to weight is 2.7 times as the weight of lint, stop pressure. Carry out the crushing. At 35℃, aging for 16h.

In the reaction kettle, the chlorinated methane, propylene oxide were added into the reaction kettle. At 80℃, the pressure was 1.8 MPa, the reaction time is 5 to 8 h, and the amount of hydrochloric acid and oxalic acid were added to the hot water at 90℃. Dewatering with centrifuge, washing to neutral, when the water content of the material is below to 60% , 130℃ of hot air flow dried to the moisture content is below 5%. Finally, the finished product sieved by 20 mesh.

3. Prepared by cellulose, methyl chloride, and ethylene oxide.

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