VIEWS: 3 PAGES: 3 POSTED ON: 3/22/2011
EVERGRAND GREEN MARKETING CORP A1-708 NEW TIMES BUSINESS STREET WUHU CHINA TEL: 0086-553-4222068 FAX: 0086-553-4223551/2 website: www.chemexchina.com e-mail: email@example.com PVP K SERIES PVP K Cosmetic grade Items K17 K17 (liquid) K30 K30(liquid) K90 K90 (liquid) K value 15-22 15-22 25-36 25-36 81-100 81-100 Vinylpyrrolidone % max 0.1 0.1 0.1 0.1 0.1 0.1 Moisture % max 5.0 --- 5.0 --- 5.0 --- Solid content % max 95 39-41 95 29-31 95 19-21 pH(5% solution) 3-7 3-7 3-7 3-7 5-9 5-9 Sulphate ash % max 0.1 0.1 0.1 0.1 0.1 0.1 .Solubility Polyvinyl Pyrrolidone has different solubility in different solvents,that is ,the extensive scope of variation In the table below, the solvents under the column of "Soluble" means that a satured solution of the polymer contains a mass fraction of at least 10%, while "Insoluble" means that the mass fraction of PVP of a satured solution is less than 1%. Soluble Soluble Soluble Insoluble Insoluble Chloroform Isopropyl Alcohol Normal Propyl Alcohol Cyclohexane Pentane Cyclohexanol Methyl Alcohol Polyethylene Glycol Ethyl Ether Carbon Tetrachloride Absolute Methylene Propylene Glycol Acetone Toluene Alcohol Chloride Normal Butyl Glycerin Triethanolmine Liquid Paraffin Dimethylbenzene Alcohol 2.Molecular Weight Molecular weight of polymer is generally expressed as weight average(Mw), number average and viscosity average. The most commonly used expression is weight average molecular weight, which is measured by light scattering method. Mw Values of PVP-K series products are shown as following: PVP-K12 2,000-------------------3,000 PVP-K17 7,000--------------1,1000 PVP-K25 28,000-----------------34,000 PVP-K30 44,000-----------------54,000 PVP-K60 320,000---------------380,000 PVP-K90 1,000,000-----------1,500,000 PVP-K120 1,600,000-----------2,000,000 3.Hygroscopicity PVP has hygroscopicity, and the amount of water that PVP can absorb is independent on the molecular weight of the polymer basically.. This fact is quite important in many applications. The equilibrium water content varies with the relative humidity in the air. 4.Viscosity Relation of PVP concentration in aquoues solution and viscosity is shown in Figure 2. 5.Complexing ablity Due to its unique structure, PVP can form complexes with a variety of compounds or simple substances, just like a lot of toxins, viruses, medicines and poisonous chemicals, to reduce their toxicity and irritability. 1)PVP can complex with iodine,the complex obtained is a kind of microbicide. 2)Water-soluble complexes can be formed by PVP complexing with insoluble effective ingredients.PVP can be used as dissolving assistant, control release agent and so on. 3)PVP has srong complexing ability with some substances,such as polyatomic phenol. The complexes deposit in neutral or acid materials. This feature can be utilized to remove polyatomic phenol and anthocyan from solutions or drinks. But if insoluble PVP is used, the effect will be better. Note: Strong alkali (such as potassium carbonate or sodium hydroxide) can make PVP cross-linked, which is easier to happen at high temperature. Under extreme conditions, it thickens liquid medicine, and prevents release of effective ingredients. PVP-K Series Application As an excipient, PVP K-90 is mainly used as a tablet binder, the dose used is less than 2% in terms of tablet weight because of better binding ability. Used as suspending stabilizer, K-90 can stabilize all kinds of effective components in medicines. And also K-90 can be used as viscosity-enhancing agent and film-forming agent for some oral liquids, effectiveness-prolonging agent and controlled-release agent for medicines. As excipients, PVP K-25 and K-30 are mainly used as tablet binders, the dose used is between 2% to 5% in terms of tablet weight. They can be used as dissolve-enhancing agents for some effective components in oral and external medicine. PVP K-25 and K-30 can also form complexs with a lot of insoluble effective components and help them to dissolve immediately to increase their bioavalability. It also can be used as suspanding stabilizer of some effective components such as sulfa and antibiotic, increase the contact time of eyedrops and eyes, improve the lubricating effect, reduce the irritation of medicines. It can prevent tablet coating from cracking and make pigments disperse evenly when used for tablet coating. As an excipient, PVPK15 can be used as solubilizer, dispersant and crystalization inhibitor for injection. It can be used as an excipient of eye medicine, reduce the irritation and prolong the effectiveness of medicine. In cosmetic industry, PVPK series can be used as film-forming agent in hair-care products such as mousse and gels. They can also be used as skin-lubricating agent in skin-care products, key component of eye and face makeups and lip-sticks, stablizer for creams and detergents, dispeisant for hair-dying agent, gel-forming agent for toothpaste. PVPK series also can be used as dispersant, film former, viscosity-enhancing agent, lubricator and adhesive in other industries. PVP whose K-value is no less than 30 can be used in handling surface of organic pigment, in order to get rid of the phenomena of pigment diffusion and improve the luster stablization and light stability. PVPK90 can be used in some special coatings such as electric conduction film, electrode paint and electricity leaking-avoided film, decrease the ageing speed made by light and heat, prolong the using life. PVPK series have good adhesive ability, they can be used in ink or printing ink to make handwriting tightly attached to the paper and difficult to come off or fade. PVP with low K-value 12 to 30 are good dispersion stabilizers to organic and inorganic pigment, when used in ink or printing ink they help to get an even and stable dispersion system with rewriting ability. As an auxiliary PVP can be used in papermaking products to improve the strength of paper, enhance the solubility of dyes, disperse pigments. When used as coating PVP can increase paper's luster, printability and grease resistance. In emulsion coating and aqueous coating, PVPK30 can increase colorability of pigment, eliminate floating color, disperse and stabilize pigment ingredients, improve luster and avoid flocculating settling of pigment. PVP may increase the affinity between hydrophobic fiber and dyes when used in textile dyeing and printing industry, thereby improve the printability of fiber. PVP also can improve the moisture regain and sun-proof ability. The K-value of PVP used in this aspect is usually between 30 to 70. In addition, we can make use of the variation of adhesive ability between PVP and different dyes to use PVP as partial dying-proof agent, to gain fabric that has vivid color and distinct outline. PVP also can avoid color transference or white ground pollution when used as detergent. In the process of polymerization, especially for emulsion or suspension polymerization, small amount of PVP can stablize dispersion system, enhance viscosity, control particle size and improve some properties of polymer. In the field of analysis chemistry and catalyst, PVP may help to measure the trace content of some metals or improve functions of catalysts because of good complexibility with some metals. PVP with relatively high K value such as K90 can greatly improve compression strength and shock resistance of cement when used as adhesive in building materials. PVP is the main element in hot-melt adhesives for special use because of its good adhesive power to glass, plastic and metals. PVP is also the key component of glue stick, pressure-sensitive adhesive, remoistenale adhesive and other products. PVP with low molecular weight can be used as dispersion stabilizer for silver halogenated emulsion in photographic industry. The above-mentioned introduction is just a part of application fields for PVP, with the development of technology, people will find a lot of new fields such as electronic material, sensitometric material, membrane material and biological engineering material.
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