Chemical knowledge: fiber, cellulose, cellulose ether definition and difference, worth collecting!

original title: Chemical knowledge: fiber, cellulose, cellulose ether definition and difference, worth collecting!putty powder is mainly composed of film-forming materials (adhesive materials), fillers, water retention agents, thickeners, defoamers and so on. The common organic chemical raw materials in putty powder are: cellulose, pre-paste starch, starch ether, polyethylene alcohol, can be dispersed latex powder and so on. The following is a polymer cat for you to analyze each of the performance and use of various chemical raw materials.fiberfiber (US: Fiber; In: Fiber) is a substance consisting of continuous or discontinuous filaments. Such as plant fibers, animal hair, silk fibers, synthetic fibers, etc.cellulosecellulose is a large molecule polysaccharide made of glucose, which is the main structural component of plant cell walls. At room temperature, cellulose is not soluble in water, but also in general organic solvents. Cotton has a cellulose content of nearly 100%, making it the purest natural source of cellulose. In general wood, cellulose accounts for 40 to 50%, there are 10 to 30% of hemicellulose and 20 to 30% lignin.the difference between cellulose (right) and starch (left):generally speaking, starch and cellulose are macromolecule polysaccharides, molecular formula can be expressed as (C6H10O5) n, cellulose molecular weight is larger than starch, cellulose can break down to produce starch, cellulose is D-glucose with beta-1, 4 sugar bonds, and starch is based on alpha-1, 4 glycoside bonds. Cellulose is generally non-branched, while starch reliable 1,6 glycoside bonds for branching. Cellulose is not soluble in water, while starch is soluble in hot water. Cellulose is insensitive to amylase, and iodine is unchanged blue.cellulose ethera polymer compound with ether structure made from cellulose ether. It is the product of the chemical reaction of cellulose (plant) by ether. According to the chemical structure of the replacement base after etherization, it can be divided into anion, cation and non-ionized ether. Methyl cellulose, hydroxyethyl methyl cellulose, methyl cellulose, ethyl cellulose, ceylon cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, ethyl cellulose, ceylon cellulose, celiac cellulose, celiac ethyl cellulose, xylene methyl ethyl cellulose and phenyl cellulose. In the construction industry, cellulose ether, also known as cellulose, is an irregular term, correctly called "base cellulose ( or ether).the thickening mechanism of cellulose ether thickener cellulose ether thickener is a non-ionized thickener, mainly by water cooperation and entanglement between molecules to thicken.the polymer chain of cellulose ether is easy to form a hydrogen bond with water in water, and the hydrogen bond makes it have a high hydrosynthesis and entanglement between its molecules.when cellulose ether thickener is added to the latex paint, absorbing a large amount of water, so that its own volume expands greatly, reducing the free space of the yan filler and latex particle s;under these two effects, the system viscosity is improved! Achieve the thickening effect we need!common cellulose (ether):generally marketed cellulose refers to hydroxypropyl, hydroxyethyl is mainly used as coatings, latex paint, hydroxypropyl methyl cellulose for mortar, putty and other products. Methyl cellulose is used in the inner wall of ordinary putty powder.methyl cellulose, also known as sodium methyl cellulose, referred to as cMC: methyl cellulose (CMC) is a non-toxic, odorless white floc-like powder, stable performance, soluble in water, its water solution is neutral or alkaline transparent viscous liquid, soluble in other water-soluble colloquilates and resins, insoluble in ethanol and other organic solvents. . CMC can be used as an adhesive, thickener, suspension, emulsifier, dispersant, stabilizer, slurry, etc. Methyl cellulose (CMC) is the most productive, versatile and convenient product in the cellulose ether category, commonly known as "industrial MSG". Methyl cellulose has the role of bonding, thickening, strengthening, emulsification, water retention, suspension and so on. application of sodium methyl cellulose in the food industry: sodium methyl cellulose is not only a good emulsified stabilizer and thickener in food applications, but also has excellent freezing and melting stability, and can improve the flavor of the product and extend storage time. the use of sodium methyl cellulose in the pharmaceutical industry: emulsified stabilizers, tablet binders and film-forming agents that can be used as needles in the pharmaceutical industry. . CMC can be used as an anti-sinker, emulsifier, dispersant, leveling agent, adhesive, can make the solid part of the coating evenly distributed in the solvent, so that the coating is not layered for a long time, but also a large number of applications in the paint. sodium methyl cellulose can be used as flocculation agent, chelating agent, emulsifier, thickener, water retention agent, slurry, film-forming materials, etc., but also widely used in electronics, pesticides, leather, plastics, printing, ceramics, daily chemical industry and other fields, and because of its excellent performance and wide use, but also continue to open up new applications, the market is extremely broad. application examples: exterior parety powder formula inner wall putty powder formula double fly powder: 600-650kg 1 double fly powder: 1000 kg white cement: 400-350kg 2 pre-paste starch: 5-6 kg pre-paste starch: 5-6kg 3 CMC: 10-15 kg HP or MC2.5 -3kg CMC:10-15kg or HPMC2.5-3kg putty powder after adding methyl cellulose CMC, pre-paste starch performance: has a good ability to rapidly thicken; after drying the surface smooth, do not de-powder, film good, no scratches. more important is the small amount of dosage, very low addition can achieve a high effect, while the production cost is reduced by 10 to 20%. the construction industry with CMC in the production of concrete parts, can reduce the water loss of slow coagulation, even in large-scale construction, but also improve the strength of concrete, but also to facilitate the production of parts from the film off. Another major use is the wall scraping large white and putty powder, putty paste, can save a lot of building materials, so that the wall enhances the protective layer and brightness. hydroxyethylene methyl cellulose, or (HEC): chemical: Hydroxyethyl cellulose introduction Hydroxyeethylene cellulose (HEC) is based on natural polymer icing material cellulose, after a series of chemical processing and production of non-ionic cellulose ether. It is a odorless, odorless, non-toxic white powder or particle that dissolves in cold water to form a transparent viscous solution that is not affected by the PH value. With thickening, bonding, dispersion, emulsification, film formation, suspension, adsorption, surfactivity, moisture retention and salt resistance and other characteristics. technical indicators the advantages of hydroxyethyl cellulose high thickening effect hydroxyethyl cellulose for latex coatings, especially high PVA coatings, to provide excellent coating performance. When the coating is thick, it does not produce flocculation. hydroxyethyl cellulose has a higher thickening effect. You can reduce the amount of use, improve the economy of the formulation, and improve the brush resistance of the coating. excellent rheodynamic properties hydroxyethyl cellulose aqueous solution is a non-Newtonian system, and its solution has a performance called touch degeneration. at rest, the coating system remains optimally thickened and opened after the product has been completely dissolved. in the dumping state, the system maintains a moderate degree of viscosity, so that the product has excellent fluidity, and does not splash. the product is easy to spread on the substrate when painting and rolling. Easy construction. At the same time, with good anti-splash. finally when the coating is completed, the system viscosity immediately restored, the coating immediately produced a flow hanging. dispersion and solubility hydroxyethyl cellulose are treated with delayed dissolution, and can effectively prevent clumps when dry powder is added. After ensuring that the HEC powder is sufficiently dispersed, it begins to be used for hydrosynthesis. properly surfacetreated hydroxyethyl cellulose, the product's dissolution rate and viscosity rise rate are well adjusted. storage stability hydroxyethyl cellulose has good anti-mold properties and provides sufficient coating storage time. Effective prevention and control of pigment and filler settlement. , use method: directly in production to join this method is the simplest, short time. Here's the following: add pure water to a large bucket with a high-cut mixer. start stirring at low speed and slowly sift the hydroxyethyl cellulose evenly into the solution. continue to stir until all particles are wet. then add mold inhibitors, various additives. Such as pigments, dispersive additives, ammonia, etc. stir until all hydroxyethyl cellulose is completely dissolved (the solution viscosity is significantly increased) before adding the other components of the formula to react. equipped with master liquid: This method is to first be equipped with a higher concentration of master liquor, and then added to the product. The advantage of this method is that it has greater flexibility and can be added directly to the finished product, but only if properly stored. The steps are similar to the steps in method (i) (1-4): the difference is that there is no need for a high-cut agitator, only a few of the power is sufficient to keep hydroxyeethylene cellulose in the solution evenly dispersed agitator, continue to stir until completely dissolved into a viscous solution. It is important to note that the anti-mold agent must be added to the mother liquor as early as possible. uses for water-based latex paint coatings: HEC as a protective colloid can be used for ethylene acetate emulsion polymerization, improving the stability of the polymerization system over a wide P-value range. In the finished product manufacturing, the use of pigments, fillers and other additives evenly dispersed, stable and provide thickening. It can also be used as a dispersant of suspended polymers such as styrene, acrylic fat and acrylic. Used in latex paint can significantly improve thickening and leveling performance. oil drilling: HEC is used as a thickener in the various mud required for drilling, logging, cementing and fracturing operations, resulting in good fluidity and stability for the mud. Increase mud carrying capacity in drilling and prevent large amounts of water from mud into the oil layer, stabilizing the production capacity of the oil layer. for construction and building materials: due to the strong water retention capacity, HEC is cement mud, mortar effective thickener and binder, it is mixed with mortar to improve fluidity and construction performance, and can extend the evaporation time of water, improve the initial strength of concrete and avoid cracks. Used to paint gypsum, bonded gypsum, gypsum putty can significantly improve its water retention and bonding strength. used in toothpaste: because of strong anti-salt and anti-acid, HEC can guarantee the stability of toothpaste paste. In addition, due to water retention, emulsification ability makes toothpaste not easy to dry. used in water-based inks, HEC can make inkdry quickly impermeable. In addition, HEC is also widely used in textile printing and dyeing, papermaking, daily chemicals and so on. Precautions for using HEC moisture absorption: each model of hydroxyethyl cellulose HEC is hygroscousing. At the factory water content is generally less than 5%, but due to different transport and storage environment, the water content will be higher than the factory, when used as long as the water content, and in the calculation of the weight of water can be deducted, do not expose it to the atmosphere. dust powder explosive: such as all organic powder, hydroxyethyl cellulose dust powder in the air a certain proportion, encounterfire will also explode, should be appropriate operation, try to avoid the atmosphere to produce dust powder. packaging specifications:
products using paper-plastic composite bag lining polyethylene bag, net weight of 25 kg. When hiding, place in the indoor ventilation and dry place, pay attention to moisture protection. In the course of transportation, pay attention to rain and sun protection. hydroxypropyl methyl cellulose (HPMC) hydroxypropyl methyl cellulose (HPMC) is a odorless, odorless, non-toxic white powder, there are instant and non-instant type two, instant type, in case of cold water rapid dispersion, disappear edited in the water, at this time the liquid has no viscosity, about 2 minutes, the viscosity of the liquid becomes larger, forming a transparent viscosity. Non-soluble type: can only be used in the dry powder-like products such as putty powder and cement mortar, in liquid glue and coatings, can not be used, there will be a clump phenomenon. chemical name and structure: physical and chemical properties appearance: white or white powder, no smell and tasteless. particle stake: 100 eye pass rate is greater than 98.5%; carbonation temperature: 280-300 degrees C. visual density: 0.25-0.70g/ (usually 0.5g/around), gravity 1.26-1.31. discoloration temperature: 190-200 degrees C. surface tension: 20% aqueous solution.