Polyvinylpyrrolidone is used

polyvinyl pyrrolidone (PVP) is a non-ionic polymer compound. Has developed into non-ionic, cationic, anion 3 categories, industrial grade, pharmaceutical grade, food grade 3 specifications, relative molecular mass from thousands to more than one million homopolymer, copolymer and crosslinked polymer series products, and with its excellent unique properties have been widely used.

​PVP is divided into four stages according to its average molecular weight size, which is usually expressed by the K value, and different K values represent the corresponding average molecular weight range of PVP. The K value is actually an eigenvalue related to the relative viscosity of PVP aqueous solution, and the viscosity is a physical quantity related to the molecular weight of polymers, so the average molecular weight of PVP can be characterized by K value. Generally, the greater the K value, the greater the viscosity and the stronger the adhesion.
​pvp Application:
​​​As a synthetic water-soluble polymer compound, PVP has the general properties of water-soluble polymer compounds, colloidal protection, film formation, adhesion, hygroscopic, solubilization or condensation, and people pay attention to its excellent solubility and physiological compatibility. In synthetic polymers such as PVP both soluble in water, but also soluble in most organic solvents, very low toxicity, good physiological compatibility is rare, especially in medicine, food, cosmetics, which are closely related to people’s health in the field, with the reduction of the price of its raw material butyrolactone, will show its good prospects for development. The following is a specific introduction to its application areas:
​Medicine and health
​PVP has excellent physiological inertia, does not participate in human metabolism, and has excellent biocompatibility, and does not form any irritation to the skin, mucous membranes, eyes, etc. Pharmaceutical grade PVP is one of the three new pharmaceutical excipients advocated internationally. It can be used as binder for tablets, granules, co-solvent for injections and flow aid for capsules. Detoxifying agent, delay agent, lubricant and coating film forming agent, dispersing agent of liquid preparation and enzyme and heat sensitive stabilizer, also can be used as cryogenic preservation agent. Used in contact lenses to increase their hydrophilicity and lubricity. The PVP K30 has been officially approved by the national medical administration. The company also supplies POvidone K30 with approval number.
​​​Food processing
​PVP itself is not carcinogenic, has good food safety, can form complexes with specific polyphenol compounds (such as tannins), and is mainly used as a food clarifying agent and stabilizer in food processing such as beer, juice, wine. PVP can form complexes with specific polyphenol compounds (such as tannins), so that it plays a clarifying and anti-coagulation role in fruit juice drinks. For example, Buschke H et al added 0.01% ~0.02% soluble PVP in the fermenter, which can effectively reduce its freezing point. PVP can also be used in the production of wine, vinegar, etc. Cross-linked PVP is widely used in beer and tea drinks. Polyphenols in beer can combine with proteins in beer to produce tannin macromolecular complex, which will seriously affect the flavor of beer and shorten its shelf life. Cross-linked polyvinylpyrrolidone (PVPP) can be complex with tannins and anthocyanins in beer, so as to clarify beer, improve the storage stability of beer and extend the shelf life. In tea beverages, the use of PVPP can appropriately reduce the content of tea polyphenols, and PVPP does not remain in tea beverages, can be reused, greatly reducing the cost.
​Daily cosmetics
​In the consumption structure of PVP, the cosmetics industry in developed countries accounts for 30% to 50%, and China accounts for 70% to 80%. Because PVP has very low toxicity and physiological inertia, it is not irritating to the skin and eyes, and has a long-term use record in the field of medicine, so it is safe to use in cosmetics. In daily cosmetics, PVP and copolymer have good dispersion and film formation, PVP has a protective colloidal effect in emulsion, can be used in fat and non-fat paste, as a setting liquid, hair spray and mousse setting agent, hair care agent, shampoo foam stabilizer, wave setting agent and hair dye dispersant and affinity agent. Add PVP to cream, sunscreen and hair remover to enhance wetting and lubrication.
​abluent
​PVP has anti-fouling reprecipitation performance, can be used to prepare transparent liquid or heavy dirt detergent, adding PVP in detergent has a good anti-color effect, and can enhance the cleaning ability, washing fabrics can prevent synthetic detergent on the skin stimulation, especially for synthetic fibers, this performance is more prominent than carboxymethyl cellulose (CMC) detergent. PVP can be combined with borax as an effective ingredient in the formulation of phenol-containing disinfectant detergent. The detergent mixed with PVP and hydrogen peroxide has the function of bleaching and killing bacteria.
​Textile printing and dyeing
​PVP has a good affinity with many organic dyes, and it can be combined with hydrophobic synthetic fibers such as polyacrylonitrile, ester, nylon and fibrous materials to improve dyeing power and hydrophilicity.
​Paints and pigments
​PVP coated paint, coating film transparent without affecting the color, improve the gloss and dispersion of paint and pigment, improve thermal stability and improve the dispersion of ink and ink.
​Polymer surfactant
​Polyvinylpyrrolidone, as a polymer surfactant, can be used as dispersant, emulsifier, thickener, leveling agent, particle size regulator, anti-reprecipitating agent, coagulant, co-solvent and detergent in different dispersion systems.
​Catalyst preparation
​Stabilized colloidal particles as active agents are used in the preparation of core-shell catalysts.
​Other aspects
​PVP can be used as a gelling agent for tertiary oil recovery to improve oil recovery rate. As an additive for photosensitive materials, it helps to reduce the emulsibility and enhance the overlay ability of developed images. It is used as thickener, dispersion stabilizer and bond regulator in polymer polymerization. In the paper industry as a dispersant, in acrylamide gasification reaction as a cocatalyst. The application of PVP in separation film, light curing resin, laser video disc, drag reducing coatings, building materials, steel making and electroplating is also rising.