Views: 87 Author: Yida Cellulose Publish Time: 27-04-2022 Origin: Site
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The development history of hydroxypropyl methylcellulose Manufacturer
Composition and structure of hydroxypropyl methylcellulose (HPMC)
The difference between hydroxypropyl methylcellulose and methylcellulose
What are the uses of hydroxypropyl methylcellulose (HPMC)?
The best hydroxypropyl methylcellulose manufacturer
Globally, the development of HPMC Manufacturers can be traced back to the beginning of the twentieth century:
In 1905, Suida reacted alkali-swelled cellulose with dimethyl sulfate to obtain cellulose ether that could not be separated;
In 1912, the first patent for the preparation of cellulose ethers appeared;
In 1927, the synthesis and separation of hydroxypropyl methylcellulose was successful;
In 1948, large-scale industrial production of hydroxypropyl methylcellulose was carried out in the United States;
From 1960 to 1970, the HPMC production process reached maturity;
In 2007, the HPMC production line of YIDA Cellulose Co., Ltd. was put into operation;
In 2010, the annual output of HPMC produced by YIDA reached 25,000 tons.
Hydroxypropyl methyl cellulose ether HPMC is a product obtained by replacing part of the hydroxyl groups on the unit with methoxy groups and the other part with hydroxypropyl groups. The structural formula is [C6H7O2(OH)3-m-n(OCH3)m[OCH2CH(OH) ) CH3] n]x and hydroxyethyl methyl cellulose ether HEMC, these are the main varieties that are widely used and sold in the market.
According to the type of substituents on the molecule: MC belongs to monoether, HPMC belongs to mixed ether.
Other differences are as follows:
| Difference between Methyl Cellulose (MC) and Hydroxypropyl Methyl Cellulose (HPMC) | ||
Difference | HPMC | MC |
Solubility | good | generally |
Viscosity | higher temperature lower | higher temperature lower |
PH | 6-8 | 4.2–9.2 |
Water retention | high | medium |
Mildew resistance | high | medium |
Adhesion | high | medium |
Fusion | water | cold water |
High water retention can fully hydrate the cement, significantly increase the bond strength, and properly increase the tensile strength and shear strength, greatly improve the construction effect to improve efficiency.
The putty in cellulose ether is mainly lubricated by water to avoid dehydration due to excessive dehydration. At the same time, it can enhance the adhesion of the putty, reduce the sagging phenomenon during the construction process, and make the construction more smooth.
In the gypsum series products, cellulose ether mainly plays the role of water, thickening, lubricating, flame retardant, etc., which solves the problems that the initial strength cannot be extended and the working time is prolonged during the construction of cylinder cracking.
Cellulose ethers play an important role in the adhesion of this material, increasing the effect of sand, making it easier to coat and improving work efficiency. At the same time, it has good anti-sag effect and high water retention performance. It can prolong the working time of the mortar, improve the ability of sand shrinkage and crack resistance, improve the surface quality and bond strength.
The higher water retention rate can eliminate the requirement of prepreg or wet tile and base layer, significantly improve the bonding strength, so that the slurry can be made into a long, fine, uniform and convenient structure, and at the same time, it has good anti-migration performance.
The ether addition of cellulose it has good adhesive edges, high abrasion resistance and low shrinkage, protects the substrate from mechanical damage, and avoids the effects of penetration throughout the building.
Cellulose ether can be used as a film-forming agent, thickener, emulsifier and stabilizer in the coating industry, making it have better wear resistance, film performance and adhesion, and the pH value of improving surface tension is qualitative, Compared with organic solvents, it is also better, with good water retention and good brushing performance.
At present, the relatively advanced HPMC production companies in the world mainly include:
1. Dow Chemical Co., Hercules Co.
2. China Hebei YIDA™ (Contact YIDA)
3. Clariant Co., Germany
4. Shinetsu Chemical Co., Japan,
5. Samsung Fine Chemical Co., South Korea
Q：Is Hydroxypropyl Methylcellulose Safe?
A：YES.HPMC does not pollute the environment.
Q：Does Hydroxypropyl Methylcellulose Have Side Effects?
A：In construction, HPMC has no side effects.
Q：What is the brand name of Hydroxypropyl Methylcellulose manufacturer
A：YIDA
