Anxin Chemistry is reliable cellulose ether manufacturers from China, specialized in HPMC Hydroxypropyl methylcellulose pharmaceutical and industrial grade production,manufacture MHEC/HEMC Methyl hydroxyethyl cellulose ether factory, with annual capacity 27000ton/year.

The factory occupy 68000㎡.

Cellulose ether production process

use the refined cotton with sodium hydroxide under certain conditions to generate alkaline cellulose sodium, again by epoxy propane, epoxy ethane, methyl chloride and chloroacetic acid etherifying agent such as etherification, react under certain conditions to produce the varieties of different types of cellulose ether, again through the neutralization, recovered solvents, washing, drying and crushing of powder products; Due to the difference of etherifying agent, the base is different, so the name of the cellulose ether is different, the deficiency existing in this process is: to produce a high cost of cellulose ether, especially cotton prices continue to rise, in recent years has led to a rapid rise in the price of refined cotton, eventually all kinds of cellulose ether products cost also rises in price, directly affect the sales and promotion.

Cellulose ether

A polymer compound with an ether structure made from cellulose. It is the product of chemical reaction of cellulose (plant) with etherifying agent. According to the chemical structure classification of etherified substituents, can be divided into anionic, cationic and non-ionic ethers. Because of the different etherifying agent used, there are methyl cellulose, hydroxyethyl methyl cellulose, carboxymethyl cellulose, ethyl cellulose, benzyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, cyanoethyl cellulose, benzyl cyanoethyl cellulose, carboxymethyl hydroxyethyl cellulose and phenyl cellulose. In the construction industry, cellulose ether is also known as cellulose, is a non-standard name, the correct name of cellulose (or ether).

Thickening mechanism of cellulose ether thickener

Cellulose ether thickener is non-ionic thickener, mainly by hydration and winding between molecules to thicken.

Cellulose ether polymer chain is easy to form hydrogen bonds with water in water, hydrogen bonds make it has a high hydration and intermolecular entanglement.

When cellulose ether thickener is added to latex paint, absorb a lot of water, so that its volume greatly expanded, reduce the free activity space of yan filler and latex particles;

At the same time, cellulose ether molecular chains are intertwined to form a three-dimensional network structure, and the pigment filler and latex particles are surrounded in the middle of the mesh, and can not flow freely.

Under these two actions, the viscosity of the system is improved! That’s the thickening we need!

Common cellulose (ether):

The cellulose that says on the market commonly refers to hydroxyl propyl, hydroxyethyl mainly uses as paint, latex paint, hydroxyl propyl methyl cellulose is used in mortar, putty and other products. Carboxymethyl cellulose is used for inner wall ordinary putty powder.

Hydroxypropyl methyl cellulose (HPMC)

Hydroxypropyl methylcellulose (HPMC) is a kind of odorless, tasteless, non-toxic white powder, there are two kinds of instant and insoluble, instant, in cold water quickly dispersed, disappear in the water, at this time the liquid has no viscosity, about 2 minutes, the viscosity of the liquid becomes larger, the formation of transparent viscous colloid. Insoluble model: can use in be bored with child powder and cement mortar wait for dry powdery product in, in liquid glue and coating, cannot use, can appear hold together phenomenon.

The physical and chemical properties

Appearance: white or almost white powder, odorless and tasteless. Particle size :100 mesh pass rate is greater than 98.5%; The pass rate of 80 mesh is more than 100%. Carbonization temperature :280-300℃. Apparent density :0.25-0.70g/ (usually about 0.5g/ m2), specific gravity 1.26-1.31. Color changing temperature :190-200℃. Surface tension: 42-56dyn/cm for 20% aqueous solution. Solubility: Soluble in water and some organic solvents, such as appropriate proportion of ethanol/water, propanol/water, dichloroethane, etc. Aqueous solution has surface activity, high transparency and stable performance. Different specifications of the product gel temperature is different, this is the thermal gel properties of HPMC. Solubility changes with the viscosity, the lower the viscosity, the greater the solubility, different specifications of HPMC performance has a certain difference, HPMC in water solution is not affected by PH value. With the decrease of methoxyl content, the gel point increased, the water solubility decreased, and the surface activity also decreased. HPMC also has thickening ability, salt removal, low ash, PH stability, water retention, dimensional stability, excellent film forming and a wide range of resistance to enzyme, dispersity and bonding characteristics.

Hydroxypropyl methyl cellulose function:

Can make the new mix mortar to thicken so as to have a certain wet viscosity, prevent segregation. Water retention (thickening) is also the most important property, helping to maintain the amount of free water in the mortar, thus giving the cementitious material more time to hydrate after the mortar is applied. (water retention) its own air, can introduce uniform

small bubbles, improve the construction of mortar.

Advantages of hydroxypropyl methyl cellulose in the field of building materials

Performance:

Easy to mix with dry powder formula. It has the characteristics of cold water dispersion. So that the solid particles effectively suspended, so that the mixture is more fine and smooth.

Mixing:

Dry blend formulations containing cellulose ether can be easily mixed with water. Get the desired consistency quickly. Cellulose ether dissolves more quickly and without clumps.

Construction:

Improve lubricity and plasticity to enhance workability and make the construction of products more convenient and fast. Enhance water retention and extend working time. Helps prevent vertical flow of mortar, mortar and tile. Prolong the cooling time, improve the work efficiency. Improve the bonding strength of ceramic tile adhesive. Enhance crack shrinkage and crack strength of mortar and plate sealant. Improved air content in mortar greatly reduces the possibility of cracks. Can enhance tile adhesive vertical flow resistance.

Application of hydroxypropyl methyl cellulose in construction field

Water resistant putty for inner and outer walls:

Excellent water retention, can prolong the construction time and improve work efficiency. High lubricity makes construction easier and smoother. Provides a smooth and even texture for a smooth putty surface. High viscosity, commonly in 10~ 150 thousand stick, make be bored with the agglutination sex with metope stronger. Improve shrinkage resistance and cracking resistance, improve surface quality. Reference dosage: internal wall 0.3-0.4%; Exterior wall 0.4 ~ 0.5%;

Exterior wall insulation mortar

Enhance the adhesion with the wall surface, and can enhance the water retention, so that the strength of mortar can be improved. Improved lubricity and plasticity to improve construction performance, combined with Shenglu starch ether can strengthen mortar, easier to construct save time and improve cost effectiveness. Controlling air penetration eliminates micro-cracks in the coating, resulting in an ideal smooth surface.?

Machinery plastering and gypsum plaster products

Improves uniformity, makes plastering easier to spread, improves vertical flow resistance and

improves fluidity and pumpability. Thus improve work efficiency. High water retention, prolong the working time of mortar, and produce high mechanical strength during solidification. By controlling the uniformity of mortar consistency, high quality surface coating is formed.

Cement-based plastering and masonry mortar

Improve the homogeneity, make insulation mortar more easy to coating, and improve the anti-vertical flow capacity. High water retention, prolong the working time of mortar, improve work efficiency, and help mortar to form high mechanical strength during solidification. With special water retention, more suitable for high water absorption brick.

Plate joint filler

Excellent water retention, can prolong the cooling time and improve work efficiency. High lubricity makes construction easier and smoother. Improve shrinkage resistance and cracking resistance, improve surface quality. Provides a smooth and even texture, and makes the joint surface more cohesive.

Ceramic tile adhesive

Make the dry mix ingredients easy to mix, do not produce lumps, thus saving the working time. And make the construction faster and more effective, can improve the construction, and reduce the cost. By prolonging the cooling time, the efficiency of brick pasting is improved. Provides excellent adhesion effect with high slip resistance.

Self leveling floor material

Provides viscosity and can be used as an anti-precipitation aid. Increased fluidity and pumpability to improve the efficiency of floor coverings. Control water retention, thus greatly reducing cracking and shrinkage.

Water based paint and paint remover

The storage life is extended by preventing solids from settling. It has excellent compatibility with other components and high biological stability. Rapid dissolution without clumping helps simplify the mixing process. Produces favorable fluidity, including low sputtering and good leveling, which ensures excellent surface finish and prevents paint from flowing down. Enhance the viscosity of water-based paint remover and organic solvent paint remover, so that the paint remover will not flow out of the workpiece surface.

Extruded concrete sheet

Enhance the machinability of extruded products, with high bonding strength and lubricity. Improve wet strength and adhesion of sheet after extrusion.

Packing, storage and transportation matters needing attention

Packing: Plastic coated polypropylene woven bag, net weight of each bag :25kg. In storage and transportation process to prevent sun and rain and moisture.

Carboxymethyl cellulose, also known as sodium carboxymethyl cellulose, referred to as CMC:

Carboxymethyl cellulose (CMC) is a nontoxic and tasteless white floc powder with stable performance and easy solubility in water. Its aqueous solution is neutral or alkaline transparent viscous liquid, soluble in other water-soluble adhesives and resins, insoluble in ethanol and other organic solvents.

CMC can be used as adhesive, thickening agent, suspending agent, emulsifier, dispersant, stabilizer, sizing agent, etc. Carboxymethyl cellulose (CMC) is the largest yield of cellulose ether, the most widely used, the most convenient product, commonly known as “industrial MONOsodium glutamate”. Carboxymethyl cellulose has the functions of adhesion, thickening, enhancement, emulsification, water retention and suspension.

Sodium carboxymethyl cellulose in food industry application: sodium carboxymethyl cellulose in food application is not only a good emulsifying stabilizer, thickening agent, and has excellent freezing, melting stability, and can improve the flavor of the product, prolong storage time. Sodium carboxymethyl cellulose in the pharmaceutical industry uses: in the pharmaceutical industry can be used as injection emulsifying stabilizer, tablet binder and film forming agent. CMC can be used as coating anti-sedimentation agent, emulsifier, dispersant, leveling agent, adhesive, can make the solid part of the coating evenly distributed in the solvent, so that the coating is not stratified for a long time, but also a large number of applications in the paint. Sodium carboxymethyl cellulose can be used as a flocculating agent, chelating agent, emulsifier, thickener, water retention agent, sizing agent, film forming material and so on, also widely used in electronics, pesticide, leather, plastic, printing, ceramics, daily chemical and other fields, and due to its excellent properties and wide range of USES, and constantly develop new application areas, the market prospect is extremely broad.

Application examples:

Exterior wall putty powder formula interior wall putty powder formula

Shuangfei powder :600-650kg 1 Shuangfei powder :1000 kg White cement :400-350kg 2 pre-gelatinized starch :5-6kg pre-gelatinized starch :5-6kg 3 CMC:10-15kg or HPMC2.5-3kg CMC:10-15kg or HPMC2.5-3kg

Properties of putty powder after adding carboxymethyl cellulose CMC and pre-gelatinized starch:

Has good rapid thickening ability; Adhesive property, at the same time has certain water retention; Improve the anti-sliding ability of the material (flow hanging), improve the operating performance of the material, make the operation more smooth; Extend the opening time of materials. Dry after the surface is smooth, do not take off powder, film forming good, no scratches. More importantly, the dosage is small, very low amount of addition can achieve a high effect; At the same time, the production cost can be reduced by about 10~20%.

CMC used in the construction industry in the production of concrete prefabricated parts, can reduce water loss and slow setting, even in large-scale construction, and can improve the strength of concrete, but also facilitate the prefabricated parts falling off from the film. Another main use is wall scraping white and putty powder, putty paste, can save a lot of building materials, so that the wall enhanced protective layer and brightness.

Hydroxyethyl methyl cellulose (HEC):

Hydroxyethyl cellulose (HEC) is a non-ionic cellulose ether obtained by a series of chemical processing with natural polymer material cellulose as raw material. It is a odorless, tasteless, non-toxic white powder or particle that can dissolve in cold water to form a transparent viscous solution that is not affected by PH. With thickening, adhesion, dispersion, emulsification, film formation, suspension, adsorption, surface activity, moisture retention and salt resistance, etc.

Hydroxyethyl cellulose has the advantage of high thickening effect

Hydroxyethyl cellulose provides excellent coating properties for latex coatings, especially for high PVA coatings. When the coating is thick, flocculation will not occur. Hydroxyethyl cellulose has a higher thickening effect. It can reduce the dosage, improve the economy of the formula, and improve the washing resistance of the coating.

Excellent rheological properties

Hydroxyethyl cellulose aqueous solution is a non-Newtonian system, and the properties of its solution are called thixotropy. At rest, after the product is completely dissolved, the coating system remains in its optimum thickening and canning state. In the dumped state, the system maintains a moderate viscosity, resulting in excellent fluidity and no splashing. During brushing and roller coating, the product is easy to spread on the substrate. Convenient construction. At the same time, with good splash resistance. Finally, when the coating is finished, the viscosity of the system is restored immediately, and the coating immediately produces flow.

Dispersion and solubility

Hydroxyethyl cellulose is treated with delayed dissolution, which can effectively prevent caking when dry powder is added. When HEC powder is fully dispersed, hydration begins. Hydroxyethyl cellulose with proper surface treatment can well adjust the dissolution rate and viscosity rise rate of the product.

Storage stability

Hydroxyethyl cellulose has good mildew resistance and provides sufficient coating storage time. Effectively prevent pigment and filler settlement.

use method:

This method is the simplest and short to be added directly in production. The steps are as follows:

Add purified water in a VAT with a high – cut agitator. Start stirring at a low speed and slowly sieve the hydroxyethyl cellulose into the solution. Continue stirring until all particles are soggy. Then add the mildew inhibitor, various additives. Such as pigment, dispersant additives, ammonia and so on. Stir until all hydroxyethyl cellulose is completely dissolved (the viscosity of the solution increases significantly) before adding the other components of the formula for reaction.

With mother liquid waiting: this method is first equipped with a higher concentration of mother liquid, and then added to the product. The advantage of this method is that it has greater flexibility and can be directly added to the finished product, but it must be properly stored.

The steps are similar to steps 1-4 in Method 1: the difference is that there is no need for a high cutting agitator, but only some agitators with enough power to keep hydroxyethyl cellulose evenly dispersed in the solution, and continue to stir until it completely dissolves into a thick solution. Note that the mildew inhibitor must be added to the mother liquor as soon as possible.

use

As a protective colloid, HEC can be used for vinyl acetate emulsion polymerization to improve the stability of the polymerization system in a wide PH range. Additives such as pigments and fillers are used in the manufacture of finished products to disperse evenly, stabilize and provide thickening. It can also be used for styrene, acrylic, acrylic and other suspended polymers as dispersants. Used in latex paint can significantly improve the thickening and leveling performance. Oil drilling: HEC is used as a thickener in a variety of muds required for drilling, well setting, cementing and fracturing operations to achieve good fluidity and stability. Improved mud transport during drilling and prevention of large amounts of water from mud into the reservoir stabilize the production capacity of the reservoir. Used in building construction and building materials: because of its strong water retention ability, HEC is an effective thickener and binder for cement slurry and mortar. Mixing it into mortar can improve fluidity and construction performance, and can prolong water evaporation time, improve the initial strength of concrete and avoid cracks. Used for plastering gypsum, bonding gypsum, gypsum putty can significantly improve its water retention and bonding strength. Used in toothpaste: because of its strong salt resistance and acid resistance, HEC can ensure the stability of toothpaste paste. In addition,

because of water retention and emulsifying ability, toothpaste is not easy to dry. Used in water-based ink, HEC can make ink dry fast and impermeable. In addition, HEC is also widely used in textile printing and dyeing, paper making, daily chemicals and other aspects.

Considerations for using HEC

Hygroscopicity: all types of hydroxyethyl cellulose HEC have hygroscopicity. The moisture content is generally below 5% when leaving the factory, but due to different transportation and storage environments, the moisture content will be higher than when leaving the factory. As long as the water content is measured when using and the weight of water is deducted when calculating, it must not be exposed to the atmosphere. Dust powder explosive: such as all organic powder, hydroxyethyl cellulose dust powder in a certain proportion of the air, meet the point of fire will also explode, should be appropriate operation, as far as possible to avoid dust powder in the atmosphere.

Packing specification: the product is made of paper plastic compound bag lined with polyethylene inner bag, net weight 25 kg. Store it indoors in a dry and ventilated place. Pay attention to rain and sun protection during transportation.