Hydroxypropyl Methylcellulose-What Is It?

Cellulose is a component naturally present in plant cell walls. There are many modified cellulose polymers including carboxymethyl cellulose calcium, carboxymethyl cellulose acetate butyrate, carboxymethyl cellulose hydroxyethyl cellulose, cellulose acetate, cellulose acetate butyrate, cellulose Gum, cellulose acetate propionate, cellulose acetate propionate, cellulose succinate, cetyl hydroxyethyl cellulose, ethyl cellulose, cellulose hydrolyzed chewing gum, Hydroxybutyl methyl cellulose, Hydroxyethylcellulose, hydroxy Ethyl ethyl cellulose, Hydroxypropylcellulose, hypromellose, methyl cellulose, hypromellose succinate/, methyl cellulose, methyl ethyl cellulose, methyl Hydroxyethylcellulose, microcrystalline cellulose that can be used in cosmetics and personal care products of potassium cellulose succinate and sodium cellulose sulfate. These cellulose ingredients may be used in cosmetics and personal care products, including bath products, hair products, eye and facial makeup, skin care products, and shaving products.

Why is it used in cosmetics and personal care products?

According to reports, these ingredients have the following functions.

Abrasives-Microcrystalline Cellulose

Adsorbent-cellulose, microcrystalline cellulose

Binder-hydroxyethyl cellulose, hydroxypropyl methyl cellulose, methyl hydroxyethyl cellulose

Anti-caking agent-microcrystalline cellulose

Binder-carboxymethyl hydroxyethyl cellulose, cellulose gum, cellulose acetate propionate carboxylate, ethyl cellulose, hydroxybutyl methyl cellulose, hydroxyethyl cellulose, hydroxyethyl cellulose, hydroxy propyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, methyl ethyl cellulose, sodium cellulose sulfate

Hydroxypropyl Methylcellulose

Raising agent-cellulose, microcrystalline cellulose

Emulsion stabilizer-carboxymethyl cellulose calcium, carboxymethyl cellulose acetate butyrate, carboxymethyl hydroxyethyl cellulose, cellulose gum, cellulose acetate propionate carboxylate, cetyl hydroxyethyl Cellulose, hydrolyzed cellulose gum, hydroxybutyl methyl cellulose, hydroxyethyl methylcellulose, hydroxyethyl cellulose, hydroxypropyl ethylcellulose, hydroxypropyl methyl cellulose, methyl cellulose, methyl ethyl cellulose, methyl hydroxyethyl cellulose, microcrystalline cellulose, sodium cellulose sulfate

Film forming agent-carboxymethyl cellulose calcium, carboxymethyl cellulose acetate butyrate, carboxymethyl hydroxyethyl cellulose, cellulose acetate, cellulose acetate butyrate, cellulose gum, cellulose acetate propionic acid Ester, cellulose acetate propionate, ethyl cellulose, hydrolyzed cellulose gum, hydroxybutyl methylcellulose, hydroxyethylcellulose, hydroxyethyl ethylcellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose , Hydroxypropyl methyl cellulose, hydroxypropyl methyl cellulose acetate/succinic acid

Opacifier-cellulose succinate, potassium cellulose succinate

Skin conditioner-humectant-cellulose succinate, potassium cellulose succinate

Anti-slip modifier-cellulose, microcrystalline cellulose

Tackifier-water-based-carboxymethyl cellulose calcium carboxymethyl cellulose acetate butyrate, carboxymethyl hydroxyethyl cellulose, cellulose gum, cellulose acetate propionate carboxylate, hydroxyethyl Cellulose, ethyl cellulose, hydrolyzed cellulose gum, hydroxybutyl methyl cellulose, hydroxyethyl cellulose, hydroxyethyl ethylcellulose, hydroxypropylcellulose, hydroxypropyl methyl cellulose, methyl cellulose, methyl ethyl cellulose, methyl hydroxyethyl cellulose, microcrystalline cellulose, sodium cellulose sulfate

Cellulose is a substance derived from plants. It is a large molecule composed of relatively small compounds called monomers. Cellulose is composed of glucose monomers, which is slightly different from starch, which is also composed of glucose monomers. The other ingredients in this group are modified cellulose polymers.

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How To Dissolve HPMC(Hydroxypropyl Methylcellulose) Correctly?

HPMC can be divided into instantaneous type (surface treatment) and hot melt type (non-surface treatment). The instant product disperses rapidly in cold water and disappears in the water. At this time, the liquid has no viscosity, because HPMC is only dispersed in water and not really dissolved. After about 2 minutes, the viscosity of the liquid gradually increased, forming a transparent viscous colloid. Hot-melt type, agglomerates in cold water, but quickly disperses in hot water, and disappears in hot water until the temperature drops to a certain temperature, and the viscosity slowly appears until a transparent viscous colloid is formed. The reason for the agglomeration in cold water is that the cellulose powder in the outer layer immediately begins to be sticky and thickens into a transparent colloid when it encounters cold water, while the inner cellulose is not in contact with water, is surrounded by colloids, or is powdery, but slowly dissolve. In practical applications, there is no need to use hot water to dissolve hot melt products, because putty powder or mortar is a powder. After dry mixing, the cellulose is separated by other substances. When it encounters water, it immediately becomes viscous and does not clump. Hot melt type can only be used in putty powder and mortar. In liquid glue and paint, there will be lumps. It is widely used in instant type (surface treatment), in putty powder and mortar, as well as liquid glue and paint. There are no contraindications. However, for the instant type (surface treatment), its water retention performance and stability cannot be compared with the hot melt type (non-surface treatment). Therefore, we recommend hot-melt (non-surface-treated) type in dry powders, such as putty powder and mortar.

In short, for different types of products, the correct method can fully dissolve them. If agglomeration occurs during the dissolution process, it is caused by insufficient stirring or direct addition of ordinary molds in cold water. At this point, it should be stirred quickly. In addition, if bubbles are generated during the dissolution process, they can be placed or defoamers can be added.

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HPMC

Viscosity Characteristics Of HPMC Aqueous Solution

The viscosity of aqueous solution of hydroxypropyl methyl cellulose is mainly affected by the degree of product polymerization, concentration of product in aqueous solution, shear rate and solution temperature. The viscosity of aqueous solution increases with the increase of product polymerization degree and concentration, and decreases with the increase of shear rate and solution temperature.Salt and safe insecticides can also be added to obtain better viscosity characteristics and application performance. Users should consider the actual situation and economy to choose hydroxypropyl methyl cellulose viscosity specifications and addition.

This product is industrial grade HPMC, mainly used as dispersant in polyvinyl chloride production, is the main auxiliary agent of PVC preparation by suspension polymerization. In addition in other petrochemical, building materials, paint remover, agricultural chemicals, printing ink, textile printing and dyeing, ceramics, paper, cosmetics and other products in the production of thickening agent, stabilizer, emulsifier, exciphers, water retention agent, film-forming agent.

Hydroxypropyl methyl cellulose HPMC in the application of synthetic resin, can make the product with particle neat, loose, appropriate specific gravity, good processing performance and other characteristics, which basically replaced gelatin and polyvinyl alcohol as dispersant.In addition, in the construction process of building industry, it is mainly used in the mechanized construction of wall, stucco and caulking. Special child decorates in construction, use as pasting ceramic tile, marble, plastic adornment, stickup intensity is high, still can reduce cement dosage.

Hydroxypropyl methyl cellulose HPMC in the coating industry for thickening agent, can make the coating bright and delicate, do not deduster, improve leveling performance. It can be used to paint gypsum, paste gypsum, caulking gypsum, water - resistant putty to improve its water retention and paste strength. Also can be used in functional ceramics, metallurgy, seed coating agent, water-based ink, cosmetics, electronics, printing and dyeing, paper and other fields.

The Difference In Physical And Chemical Properties of HPMC and HEMC(2)

Gel temperature is an important indicator of cellulose ether. The aqueous solution of cellulose ether has thermal gel properties. As the temperature increases, the viscosity continues to decrease. When the temperature of the solution reaches a certain value, the cellulose ether solution is no longer transparent, but forms a white colloid, and finally loses its viscosity. The gel temperature test means that the cellulose ether sample is slowly heated in a water bath from a 0.2% concentration of cellulose ether solution until the solution appears white or even white gel, and the viscosity is completely lost. The temperature of the solution is the gel temperature of the cellulose ether.

The ratio of methoxy, hydroxypropyl and HPMC has a certain effect on the water solubility, water holding capacity, surface activity and gel temperature of the product. Generally speaking, HPMC with high methoxy group content and low hydroxypropyl content has good water solubility and good surface activity, but the gel temperature is low: increasing the hydroxypropyl content and reducing the methoxy group content can increase the gel temperature. But excessive hydroxypropyl content will lower the gel temperature, reduce water solubility and surface activity. Therefore, cellulose ether manufacturers must strictly control the group content to ensure product quality and stability.

3. Application of construction industry

HPMC and HEMC have similar functions in building materials. It can be used as a dispersant, water-retaining agent, thickener, binder, etc. It is mainly used for the molding of cement mortar and gypsum products. Used in cement mortar to increase its cohesiveness and workability, reduce flocculation, increase viscosity and shrinkage, and have the functions of retaining water, reducing water loss on the concrete surface, increasing strength, preventing cracks and weathering of water-soluble salts. It is widely used in cement, plaster, mortar and other materials. It can be used as a film-forming agent, thickener, emulsifier and stabilizer for latex coatings and water-soluble resin coatings. It has good abrasion resistance, uniformity and adhesion, and improves surface tension, acid-base stability and compatibility with metallic pigments. Due to its good viscosity storage stability, it is especially suitable for emulsion coatings as a dispersant. All in all, although the system is small in volume, it has good effects and is widely used.

The gel temperature of cellulose ether determines its thermal stability in application. The gel temperature of HPMC is usually between 60°C and 75°C, depending on different types, group content and production processes of different manufacturers. Due to the characteristics of the HEMC group, it has a higher gel temperature, usually above 80°C, so its stability at high temperatures is due to HPMC. In practical applications, in the hot summer construction environment, the water holding capacity of HEMC with the same viscosity and dosage is better than HPMC. Especially in the south, mortar is sometimes applied at high temperatures. The cellulose ether of the low-temperature gel will lose its thickening and water-holding effects at high temperatures, thereby accelerating the hardening of the cement mortar and directly affecting the construction and crack resistance.

Because there are more hydrophilic groups in the structure of HEMC, it has better hydrophilicity. In addition, the vertical flow resistance of HEMC is relatively good. The application of HPMC for tile adhesive will be better.

The Difference In Physical And Chemical Properties of HPMC and HEMC(1)

Cellulose is the oldest and most abundant natural polymer on earth. It is the inexhaustible and inexhaustible human's most precious natural renewable resource. Cellulose has the characteristics of low price, abundant materials, biodegradability, low heat, non-toxicity, and good biocompatibility. The basic ring of cellulose macromolecule is anhydroglucose, the molecular formula is (c6h1005) n, which contains 44.44% carbon, 6.17% hydrogen, and 49.39% oxygen. Each glucose residue ring contains three alcoholic hydroxyl groups, of which two secondary alcoholic hydroxyl groups and one primary alcoholic hydroxyl group play a decisive role in the properties of cellulose. By chemically modifying cellulose, a series of cellulose derivatives can be obtained. Using natural cellulose as raw material, cellulose ether can be obtained through processes such as alkalization, etherification, neutralization, purification, and drying.

Cellulose ether is one of the important derivatives of cellulose. It has the characteristics of solubility, viscosity, stability, non-toxicity and biocompatibility. According to the different types of substituents, ionization and solubility of cellulose ethers, there are different classifications. The substituents on the cellulose ether have a great influence on its performance. According to the different substituents, cellulose ethers can be divided into MC, HEC, CMC, HPMC, HEMC, etc.

1. Structure

1.1 HPMC

Hydroxypropyl methyl cellulose (HPMC) can be produced from refined cotton, wood pulp, methyl and polyhydroxypropyl ether cellulose. It is made by etherification of cellulose with propylene oxide and chloroform. The methoxy group on the methyl chloride replaces the hydroxyl group on the glucose ring, and the hydroxyl group is replaced by a hydroxypropoxy group, and chain polymerization occurs. HPMC has the characteristics of thermal gel, its solution does not carry ionic charge, does not interact with metal salts or ionic compounds, has strong anti-mold properties, and has good dispersibility, emulsification, thickening, adhesion, water retention and retention Colloidal.

1.2 HEMC

The production and preparation of hydroxyethyl methyl cellulose (HEMC) is slightly different from HPMC. After the cellulose is alkalized, propylene oxide is replaced by ethylene oxide to replace the hydroxyl group on the glucose ring. Compared with HPMC, the chemical structure of HEMC has more hydrophilic groups, so it is more stable at high temperatures and has good thermal stability. Compared with the common HPMC cellulose ether, it has a higher gel temperature and has advantages in high temperature. Like HPMC, HEMC has good mildew resistance, dispersibility, emulsification, thickening, adhesion, water retention and glue retention.

2. Physical and chemical properties

The physical and chemical properties of this standard include: appearance, fineness, dry weight loss, sulfate ash, pH value, solution transmittance, solution viscosity, gel temperature, group content (excluding mortar application test).

Appearance, fineness, loss on drying, sulfate ash, pH, solution transmittance, viscosity, etc. are all related to the model and function of the product. Different manufacturers have different levels, so I won’t discuss them here.

2.1 Cellulose ether base content

Due to the different substituents of HPMC and HEMC, the cellulose ether sample can be heated and reacted in a closed reactor. Under the catalysis of adipic acid, the substituted alkoxy group is quantitatively cracked by hydroiodic acid to generate the corresponding iodoalkane. The reaction product is extracted with o-xylene, and the extract is injected into a gas chromatograph for component separation, which can distinguish between hydroxypropoxy and hydroxyethoxy. The internal standard method was used to quantitatively calculate the content of the components to be tested in the sample.

2.2 Gel temperature

Why Add Hydroxypropyl Methyl Cellulose To The Mortar?

Hydroxypropyl methyl cellulose is a non-ionic cellulose ether prepared from pure cotton through a series of chemical treatments. Mainly used in the construction industry: waterproof putty powder, putty paste, steel putty, paint glue, masonry mortar, dry powder insulation mortar and other dry building materials.

Hydroxypropyl methylcellulose (HPMC) has good water retention, convenient construction, wide viscosity, and meets various needs.

The good performance of hydroxypropyl methylcellulose (HPMC) can significantly improve the performance of mortar, pumping and spraying performance. It is an important additive in mortar.

Hydroxypropyl methylcellulose (HPMC) has excellent water retention and is widely used in various mortars, including masonry mortar, plastering mortar and floor leveling mortar, to improve the bleeding of mortar.

Hydroxypropyl methylcellulose (HPMC) has a significant thickening effect, improves the construction performance and workability of the mortar, changes the fluidity of the product, achieves the expected appearance effect, and improves the fullness and volume of the mortar .

Hydroxypropyl methylcellulose (HPMC) can improve the cohesiveness and operability of mortar, overcome common problems such as shelling and hollowing of ordinary mortar, reduce blanking, save materials, and reduce costs.

Hydroxypropyl methylcellulose (HPMC) has a certain retarding effect, which can ensure the use time of the mortar and improve the plasticity and construction effect of the mortar.

Hydroxypropyl methyl cellulose (HPMC) can introduce a proper amount of air bubbles, which can greatly improve the frost resistance and durability of the mortar.

Cellulose ethers combine physical and chemical functions to maintain water and thicken. During the hydration process, substances that cause micro-expansion properties are produced, so that the mortar has a certain degree of micro-expansion performance and prevents the mortar from hydration in the later stage. The cracks caused by shrinkage increase the service life of the building.

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What Is Redispersible Polymer Powder?

Redispersible polymer powder is a polymer emulsion that is converted into a powdered thermoplastic resin material through a series of processes such as high temperature and high pressure, spray drying, and surface treatment. When mixed with water, these powdery organic binders can be re-dispersed in water back into a new emulsion, and their properties are basically the same as the original copolymer emulsion.

Adding redispersible polymer powder to the mortar can improve the cohesiveness, cohesion and elasticity of the mortar. One is to improve the water retention of the mortar, form a film, and reduce the evaporation of water. Secondly, the bonding strength of the mortar can be improved.

This redispersible polymer powder was invented by the German Wacker Hemie in 1953, which made it possible to produce polymer-modified RDP For Dry mix mortar. The development of redispersible polymer powders has only a history of more than 50 years. In 1953, Germany invented the world's first practical redispersible powders. With the continuous innovation and progress of the follow-up product production process, combined with the follow-up application, a series of results have been achieved and a series of products have been developed.

The world's first redispersible polymer powder is vinyl acetate homopolymer powder. But this kind of polymer powder can only be used in non-alkaline systems, because esters or polymers with ester bonds react under alkaline conditions to generate free alcohols or acid salts, so that the performance changes from insoluble to water solubility, and that the increase in the glass transition temperature will lose the required elasticity, or due to other reasons. In 1960, ethylene-vinyl acetate copolymer powder (EVA) was successfully produced. EVA mainly uses ethylene, a non-saponifiable organic monomer, to internally plasticize the redispersible polymer powder, which significantly improves the flexibility of the polymer powder. The polymer powder can be used in the alkaline system of Portland cement.

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