polyvinylpyrrolidone pvp solution

Polyvinylpyrrolidone is referred to as PVP, which is a polymer of vinylpyrrolidone, and is divided into soluble PVP and insoluble PVPP(polyvinyl polypyrrolidone) because of its different polymerization degree. The relative molecular weight of soluble PVP is about 8000-10000, which can be used as a precipitating agent and precipitated by interaction with polyphenols. Using this method, PVP is easy to remain in the wine. Polyvinylpyrrolidone (PVP) is not susceptible to chemical reactions. Stored under normal conditions, dry PVP is very stable. Mildew resistant solutions are also stable. When heated to 150℃ in air or mixed with ammonium persulfate at 90℃ for 30min, PVP will be exchanged into water insoluble compounds. In the presence of azo compounds or oxidants such as dichromate, light turns the PVP solution into a gel. The solution is precipitated when co-heated with a strong base (such as sodium silicate or trisodium phosphate).

Solubility in various solvents (e.g., water, alcohols, amides, chlorine)
Heat resistance (Tg=160-170℃)
High hygroscopicity
Film-forming property
Gumming property
complexability
Function details
Excellent menstrual stability
In the presence of air, the K value decreased less, showing a higher time stability.
Excellent hygroscopicity
Compared with other water-soluble non-ionic polymers, it shows higher hygroscopicity.
Excellent viscosity stability
For changes in salt concentration or pH, an aqueous solution with stable viscosity can be obtained.
Excellent adhesion
It has good adhesion to various substrates.
Excellent heat resistance
Compared with other water-soluble non-ionic polymers, it exhibits higher heat resistance.
Excellent hydrophilicity
After mixing with the resin, the surface of the resin can be hydrophilized.
Excellent dispersion
It can disperse CB and CNT well.
Common applications:
1, used as gas chromatography fixed liquid is widely used as thickening agent, emulsifier, lubricant and clarifying agent, but also as a disinfection agent PVP-I complex.
2, used as colloidal stabilizer and clarifying agent, can be used for beer clarification.
3. Disinfectant for medical, aquaculture and animal husbandry. Used for skin and mucous membrane disinfection.

Solubility and solution properties of polyvinylpyrrolidone PVP
Because PVP molecules contain both hydrophilic groups and oleophilic groups, it can interact with many solvents so that it can be dissolved in water, but also in many alcohols, carboxylic acids, amines, halogenated hydrocarbons and other organic solvents. The solubility of PVP in water is limited only by its own viscosity. Examples of organic solvents that can dissolve more than 10% PVP at room temperature are as follows:

· Alcohol: methanol, ethanol, propanol, isopropanol, butanol, isobutanol, amyl alcohol, cyclohexanol, methylcyclohexanol, phenol, ethylene glycol, propylene glycol, butanediol, glycerol, diacetone alcohol

· Acid formates, acetic acid, propionic acid

· Ether-alcohol glycol ethers, diethylene glycol, triethylene glycol, 1, 6-hexadiol, polyethylene glycol 400, 2,2′ -thiodiethanol

· Lactones gamma-butyrolactones

· Ester ethyl lactate

· Ketones methyl cyclohexanone, cyclohexanone (hot)

· Chlorinated hydrocarbons dichloromethane, chloroform, 1, 2-dichloroethane

· Lactamides 2-pyrrolidone, N-methylpyrrolidone, N-vinylpyrrolidone, N-ethylpyrrolidone

· Amines Butylamine, cyclohexylamine, aniline, ethylenediamine, pyridine, morpholine, ethanolamine, diethanolamine, triethanolamine, aminoethylethanolamine, 2-hydroxyethylmorpholine, 2-amino-2-methylpropanol

· Nitrohydrocarbon nitromethane, nitroethane

· Hydrocarbon benzene, toluene, xylene, petroleum, ether, tetrahydrobenzene, pentane, dry cleaning solvent oil *, kerosene *, solvent oil, mineral oil, cyclohexane, methyl cyclohexane, turpentine

Ethers dioxane, diethyl ether, dimethyl ether, ethyl vinyl ether, isobutyl vinyl ether, tetrahydrofuran

· Chlorinated carbon tetrachloride and chlorobenzene

· Ketone acetone, 2-butanone, cyclohexanone

· Ethyl acetate, isobutyl acetate

* When 25% butanol is used as a co-solvent, the solubility of PVP can exceed 5%.
From the above solubility of PVP, it can be seen that it is generally soluble in solvents with strong polarity, but not soluble in solvents with weak polarity. However, when PVP is water-free (which is very difficult), it is soluble in dioxane, acetone, toluene and other weak polar solvents; When the helpful solvent is present, it can be dissolved in non-polar solvents such as hydrocarbons. For example, PVP can be directly dissolved in some propellants containing -CHX2 groups, such as F21(dichloro-fluoromethane), F22(monochlorodifluoromethane), and 20-30% ethanol can also be used as a cosolvent to dissolve in F11(trichloro-fluoromethane), F12(dichlorodifluoromethane). F113,2,2 (1,1,2 – acetone – 1-3 ethane), F114,1,2,2 (1, 2 – dichloro – 1 – four fluorine ethane), F142 (1 – chlorine – 1, 1-2 fluorine ethane).
The properties of PVP aqueous solution and non-aqueous solution have been studied by foreign researchers. Nomura and Miyahara reported that the specific volume V0 of PVP dilute solution has an obvious linear relationship with temperature in the range of 5-55 ℃. The effective density of PVP dilute solution at 25℃ was 1.264±0.016gcm-3, with the temperature coefficient of 9.5d4/℃ removed.

Henstenberg, Levy, Elias et al. determined the specific refraction index of PVP aqueous solutions. The specific refractive index increment at 436nm,546nm, and 589nm is 0.179±0.007cm3g-1 at 20-25 ℃. When PVP is dissolved in NaCl solution (0.2M or 0.2m), its behavior properties, such as viscosity, are only slightly different from that of PVP solution, which is an excellent feature that distinguishes PVP from most other polymers.

Fikentscher and Herrle studied the solubility of PVP in mixed solvents, and the results showed that almost all PVP entered the aqueous phase in the mixed solvent of water/dichloromethane, which was the opposite of the situation of monomer NVP. Almost all NVP enters the dichloromethane phase in this binary solvent system. Dobry also studied the distribution of PVP in four two-phase mixed solvent systems. For water/amyl alcohol system, PVP completely entered the water phase, but for water/phenol system, PVP was more inclined to enter the phenol phase, and the partition coefficient was 10. In glycerol/isoamyl alcohol, PVP completely enters the glycerol phase. Since acetone is almost insoluble to PVP, when a large amount of acetone is added to the aqueous solution of PVP, part of PVP will precipitate with acetone and form two phases. The position of the three phase solution point tends to increase the proportion of acetone with the decrease of K value. In other words, for a certain molecular weight distribution of PVP polymers, when acetone is added to its aqueous solution, the first precipitation into the acetone phase is the larger part of the molecular weight. Therefore, PVP with different molecular weight can be separated by fractional precipitation. For the same reason, acetone can be titrated into PVP aqueous solution to determine the K value of the sample, the smaller the K value, the greater the amount of acetone required when turbidity occurs.

Application, for example
Water treatment industry
PVP can be used as the pore making agent of ultrafiltration membrane in the water treatment industry and has many excellent properties, which can effectively control the size of the membrane pore and the distribution of the hole, increase the density of the die hole, improve the permeability of the membrane, and improve the hydrophilicity of the membrane surface. The ultrafiltration membrane industry generally chooses K30, which has narrow molecular weight distribution and good pore formation effect.
Cosmetics industry
PVP can be used as film agent, thickener, lubricant and adhesive in the cosmetics industry, used as eruption agent, hair fixing mousse, hair fixing gel; In skin care products and hair dye, modifier, shampoo, lip balm, sunscreen, toothpaste and other aspects and suitable for use as excipients.
Textile printing and dyeing
PVP has a good affinity with many organic dyes, combined with hydrophobic synthetic fibers such as polyacrylonitrile, ester, nylon and fibrous materials, can improve dyeing power and hydrophilicity, and is commonly used as bleach and dyeing agent. However, the binding force of PVP and different dyes is different, so it can be used as an anti-dye.
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.
abluent
Polyvinylpyrrolidone PVP is an excellent anti-fouling redeposition agent, anti-stain agent and cleaning agent, which can prevent color change in detergent, enhance the cleaning ability and have no irritation to the skin.
The performance of synthetic fibers is more prominent than that of carboxymethyl cellulose (CMC) detergent. In addition, PVP can be combined with borax and hydrogen peroxide solid in the formula of disinfection detergent, which has the function of bleaching and killing germs.
glue
PVP has special adhesion to paper, metal and plastic, fabric surface; Coupled with its characteristics of hydrophilicity, dispersion stability, non-thixotropy, thickening, etc., it is widely used in various binder formulations.
Other industrial applications
Used as dispersant, thickener and adhesive in inks, coatings and paints.
In agriculture, it can be used as a seed coating agent for surface treatment of crops or other plant seeds.
Office supplies as printing ribbon, ink, graphite, ink thickener, lubricant, dispersant, solid glue, adhesive raw materials, paper and so on.
In the water treatment industry, it can be used as a pore-causing agent for water treatment film.
Batteries, electronics, electroplating, etc.