1st, polyanionic cellulose (PAC,PAC HV,PAC LV,PAC R,PAC RG,CMC HV,CMC LV) PAC Introduction is made from natural cotton short fibers through a series of complex chemical reactions and the obtained cellulose ether derivatives, is an important water-soluble anionic cellulose ether. With "three high and one low" features: high stability, high temperature resistance, high acid salt, low usage.
2nd, the basic properties of the PAC: Physical Properties: Appearance is white, white or yellowish powder or granules, non-toxic, odorless, hygroscopic, soluble in cold water and hot water. Excellent chemical properties:
1. The high degree of substitution: substitution value 0.85-1.4.
2. Heat stability: water below 80 ℃ stable performance, when the temperature can be displayed up to close to 150 ℃ certain viscosity.
3. Acid Salt: PH value stable within the range of 3-11, can be applied to various types of polar harsh environments.
4. Good compatibility: and other cellulose ethers, water soluble adhesive, softener, resin, etc. can be compatible.
5. The good solubility: using simple stirring equipment can be rapidly dissolved in cold water and hot water, dissolved in hot water faster.
6. Good stability: PAC solution with a light stability, longer shelf life; strong mildew anti-bacterial properties, not fermented.
7. The low dosage: PAC because of the high degree of substitution, high stability characteristics, in the same environment is very small amounts, generally add about 0.2% to about 0.6%, equivalent to only other cellulose ethers ( as about CMC, etc.) 30-50%, reducing the cost, with a higher price advantage.
8. Green: PAC is the main raw material for refined cotton, itself has no pharmacological effect on humans, the production process of green.
3rd, PAC uses and effects: polyanionic cellulose sodium salt (PAC) is a water-soluble organic polymer, soluble in water to form a transparent liquid having a certain viscosity, and can be widely used in industrial production in many areas, play a good thickening, thickening, binding, suspension, water, emulsifying, dispersing, stabilizing role.
4th, PAC's main application industries Description:
1. for oil drilling, wells and other projects: PAC is a water-soluble polymer compounds, easily dispersed in all water-based drilling fluids, including fresh water, sea water, saturated brine and other fluids can be applied, mainly used in offshore drilling and land deep in the low solids drilling fluids, PAC can significantly reduce the amount of fluid loss, thinning cake thickness, and pages have a strong inhibition of the brine. Divided viscosity (HV), low viscosity (LV), medium viscosity (R) three.
2. For the chemical industry: Can be used for synthetic detergent, soap, toothpaste, skin cream, shampoo, as a stabilizer, emulsifier, skin care agent, played adjust the viscosity, stable solution, enhanced detergency and so on, is one of the active additives on the industry best. For use in detergents is the use of emulsifying and suspending its thickening properties of a protective colloid, during the washing process so that it produces the anion can be washed simultaneously with surface dirt particles are negatively charged, so that the dirt particles in the aqueous phase was divided phase resistance, and the solid phase was washed surface repellency, thus preventing redeposition on the laundry, can maintain the whiteness of white fabric, fabric color bright color; for soap soap, perfume can even dye released in body soap. Recommend the use of medium viscosity products.
3. For the coatings industry: in water-based paint as a thickening agent, suspending agent and film-forming agent, which allows the storage stability of the product exhibition uniform color, anti-mildew properties, good leveling easy to construct and improve the flexibility of the coating and gloss. The use of high viscosity model has better thickening effect and storage stability.
4. For the paper industry: the paper industry, widely used in surface sizing coated paper, LWC, and can be used as a paper smoothing agents, coating agents, sizing and so on. PAC has a film-forming, 0.1% -0.3% in the PAC to make paper pulp strength increased by 50%, the surface tension increases 1-2-fold, while the paper uniform, when printing ink is easy to penetrate, a print sharp edges. PAC treated with an aqueous solution of paper coated with iron, lead, metal salt solution can be made waterproof, greaseproof paper. Application Type: General use of low viscosity and ultra sticky models to increase the solid content of the slurry.
5. For the food industry: PAC tasteless, non-toxic, easy to dissolve, long-term preservation is not corruption, high viscosity, shape retention and strong, can be widely used in the food industry. As in the processing of jam, syrup, juice and Worcestershire sauce as a viscous agent and extenders; for snack foods can make homogeneous, fine, beautiful appearance; when used in the manufacture of ice cream as a stabilizer; for the manufacture of lemon, Easy edible oil rancidity grapes and other beverages as well as semi-fluid state fixative; also as a film forming agent used for the surface treatment of vegetables, fruits, eggs, tea, so that long-term to maintain the original color and flavor. Use of high-purity, high degree of substitution of the acid-type PAC products to minimize the usage, improve food quality and extend shelf life.
6. used in the construction industry: in building construction, for mechanized construction drywall, stucco, caulking, etc., after joining the PAC, can thicken water retention, play retarding effect, both for large-scale construction, and can improve the strength of the building. For wall plaster, gypsum paste, plaster caulking, water putty, can significantly increase water retention and adhesive strength, and has good workability, cracking and other characteristics. Application Type: Instant generally used in high-viscosity models.
7. For the ceramic industry: In ceramics You pulp, PAC primarily as water retention, thickening, suspending, and bonding and so on, in order to control You slurry rheology and drying time, and increase the adhesive bond strength glaze . Application Type: According to the type of porcelain, You pulp properties and seasonal temperature differences, such as, high and low viscosity products are various models of the application; in the ceramic body as a body enhancer PAC general use, it can improve plasticity and body blank flexural strength, improve yield green, very suitable for large size tiles, high raw material content Baipi barren porcelain tiles, special ceramics, aluminum and other materials.
8. PAC applications in other industrial areas: PAC is widely used in other industries, even very special, such as: graphite industry as a thickener for suspension; formaldehyde production and storage as a polymerization inhibitor; flotation Cu -Zn mine, you can replace cyanide environmental significance; in the adhesive industry, PAC acrylate copolymer adhesive system suitable for furniture, concrete, material containing sticky and gray matter; but also as a film and other photographic materials The surface treatment agent; latex stabilizer; thickener dispersant pesticides and plastics industry, stabilizers and emulsifiers; used as a binder in efficient coal / pellet / charcoal / Mineral products such as molding The amount of low and good bonding properties, and is suitable for other types of non-sticky powder bonded material molding; play a role in the thickening of the suspension stabilizing system CWS; bentonite is good tackifier, and played the role of fluid loss; in the textile industry as a thickening thickening suspensions, can also be used alginate thickener; for desiccant and calcium oxide mixed co-additive; incense stick Industry junction and the like.
5th, PAC dissolution method: PAC (especially high-viscosity PAC) dissolved in water has a certain viscosity, such as improper dissolution will lead to a greater clumping, affecting normal use. Correct dissolution method: you must first amount of water to the container Riga, who stirred rapidly while slowly stirring stick, uniform dispersion join PAC powder, stir and then add the need for a complete, attention to try not to make it into larger clumps, then stir for a half an hour later. This half-hour swelling time is PAC, PAC process is first dissolved in water and then dissolving water-swellable, water until completely wet PAC powder, and then stir it. If a large group at the junction can be broken down into small pieces, and then continue to stir after waiting for the water to fully dissolve completely wetted. PAC and the ratio of water to dissolve in accordance with the actual need, as proposed by 0.5-3%, the maximum solubility of less than 10%. If you wish to accelerate the dissolution: 1. Use warm or hot water to dissolve; two high-speed mixer; three chosen instant type PAC, this product is easy to agglomerate after surface modification...