1. What is polyethylene pyrrolidonePolyvinylpyrrolidone (PVP) is a kind of synthetic polymer, which is widely used in medicine, cosmetics and food industry because of its unique chemical stability, good solubility and non-reactivity. In recent years, due to these characteristics, PVP has also begun to play an important role in modern agriculture, especially in crop protection and yield enhancement.The chemical properties of PVP make it an ideal excipient that can be used to improve the formulation of pesticides and fertilizers. It can effectively enhance the stability of the active ingredient and improve its adhesion and durability on the crop. This not only helps to improve the efficiency of the use of pesticides and fertilizers, but also reduces pollution to the environment, because less pesticides and fertilizers can achieve the desired effect.In addition, the application of PVP in hydrogel technology is a major breakthrough. PVP based hydrogels can be used as intelligent…

1, 2-hexadiol is a kind of polyol, the appearance is colorless and transparent, has a mild sweet fragrance, as a cosmetic raw material, has a good bactericidal and moisturizing effect (antibacterial mechanism: can enter the cell membrane of microorganisms, and then destroy the integrity of the cell membrane, let the cell fluid penetrate out, and finally lead to the death of microorganisms), while no sensitive side effects on human skin. Physical and chemical properties1,2 hexadiol is soluble in water, ethanol and so on.12 hexanediol generally refers to 1, 2-hexanediol, which mainly has a moisturizing effect on the skin. It also has an antibacterial and antiseptic effect in various skin care products and cosmetics, and can improve the user’s skin feeling. It has many effects and effects on the skin, such as moisturizing, moisturizing, antibacterial and so on.1, moisturizing: 1, 2-hexadiol is a common moisturizing agent, with strong hygroscopic property, water…

Standards for UsePermitted for use in grape juice used for wine production and grape wine only.Shall be used at not more than 0.50 g/L in grape wine as copolymer of vinylimidazole/vinylpyrrolidone. When Copolymer of Vinylimidazole/ Vinylpyrrolidone is used in grape juice used for wine production, this additive is considered to be used in grape wine.The Copolymer of Vinylimidazole/Vinylpyrrolidone used shall be removed before the completion of the final product.Compositional SpecificationsSubstance Name Copolymer of Vinylimidazole/VinylpyrrolidoneDefinitionCopolymer of Vinylimidazole/Vinylpyrrolidone is produced by polymerization of 1-vinylimidazole and 1-vinyl-2-pyrrolidone, with a ratio of 9 : 1, in the presence ofcrosslinking agent 1,3-divinylimidazolin-2-one at a level of less than 2%.ContentCopolymer of Vinylimidazole/Vinylpyrrolidone, when calculated on the dried basis,contains 26.0–29.0% of nitrogen (N = 14.01).Description Copolymer of Vinylimidazole/Vinylpyrrolidone occurs as a white toyellowish-white powder.Identification Determine the absorption spectrum of Copolymer of Vinylimidazole/Vinylpyrrolidone as directed in the Disk Method under InfraredSpectrophotometry, and compare with the Reference Spectrum. Both…

Cu removal from wine with copolymer PVI/PVP: Effects on Cu fractions and bindersThe lower pH wines improved the total copper removal rate by PVI/PVP treatment.Abstract• PVI/PVP treatment effectively removes all forms of Cu in white wine.• H2-bound Cu is more easily removed from red wine than organic acid-bound copper.• H2 removes S with Cu, without removing other weaker Cu bindersCertain forms of copper in wine can affect the flavor and development of the wine. The copolymer polyethylimidazole/polyethylpyrrolidone (PVI/PVP) is known to remove copper from wine, but its effects on different forms of copper are uncertain. In this study, 3 Cu fractions in white wine were determined by colorimetric method, and 2 Cu fractions in red wine were determined by diatomite deep filtration and atomic spectrometry. PVI/PVP is formulated with silica or chitosan and reduces all three fractions of Cu measured in white wine, as well as sulfide-bound Cu in red…

N-methylpyrrolidone (NMP)N-methylpyrrolidone (NMP) has a series of excellent physical and chemical properties, is a non-toxic, high boiling point, strong polarity, low viscosity, small corrosion, high solubility, low volatility, good stability, easy recovery of efficient selective solvent.N-methylpyrrolidone (NMP) applications(1) Key players in the electronics industryIn the electronics industry, NMP is an important solvent for manufacturing electronic devices such as semiconductors, integrated circuits, and liquid crystal displays. It is capable of dissolving electronically active materials such as metals, oxides and polymers to help complete processes such as electroplating, etching and cleaning.(2) Important applications in the field of medicineIn the pharmaceutical industry, NMP also plays an important role. It is an ideal solvent for the synthesis of drugs and drug intermediates. NMP is involved in the preparation of some antiviral drugs and anti-tumor drugs. NMP can provide good solubility and stability, making the drug preparation process more efficient and safe.(3) generalists in chemical…

The preparation process of PVP includes the synthesis of monomer NVP and polymer PVP. During the synthesis of monomer NVP, the key techniques include the synthesis and purification of monomer. In the synthetic process of polymer PVP, the key technologies mainly involve polymerization technology and drying technology. Acetylene method and gamma-butyrolactone methodAcetylene process is the mainstream NVP production process at present, with high maturity. The method takes acetylene and formaldehyde as starting materials, and obtains NVP monomer through multi-step reaction.Firstly, the PVP monomer NVP is produced by the acetylene method through the synthesis of 1, 4-butanediol (BDO), and then through catalytic dehydrogenation to ring, ammonolysis and acetylene addition.Acetylene process has the advantages of mature technology, cheap and easy to obtain raw materials, and suitable for large-scale industrial production. However, the acetylene process is long, the investment of fixed assets is large, the operating conditions are strict, and the main raw…

DMSO (‌ dimethyl sulfoxide) ‌ is an organic compound with the formula ‌ (CH3)2SO(CH_{3})_{2}SO(CH 3)2SO. ‌DMSO has shown its unique properties and applications in many fields, ‌ including but not limited to as solvent, ‌ catalyst and in the synthesis of medicine and ‌ pesticide. ‌ The following is an overview of the main working principles and application areas of DMSO: ‌ As a solvent: ‌DMSO has a high boiling point and a low freezing point, ‌, which makes it suitable as a solvent for high temperature reactions, ‌ is also suitable for use at low temperatures. ‌, for example, ‌ in pesticide synthesis, ‌DMSO is used as reaction solvent, ‌ can improve the conversion and yield of the reaction. ‌ As a catalyst: ‌ In organic synthetic chemistry, ‌DMSO can participate as a catalyst in reactions, ‌ especially in the process of promoting C-H bond chlorination of (heteroaromatic) hydrocarbons.…

DMSO, or dimethyl sulfoxide, is a versatile solvent that has a wide range of applications in various industries. It is commonly used as a solvent for chemical reactions, as a cryoprotectant in cell preservation, and as a topical analgesic and anti-inflammatory for pain relief. Many people also use DMSO as a home remedy for various ailments, such as arthritis and skin conditions. If you are looking to buy DMSO, there are several options available to you. One option is to purchase it online from a reputable chemical supplier such as Shanghai Yearn Chemical Technology Co., Ltd. As a trusted supplier of chemical raw materials, they offer a variety of products to meet your industrial and personal needs. Shanghai Yearn Chemical Technology Co., Ltd. is a comprehensive import and export trading company that covers the Jiangsu, Zhejiang, Shanghai and Anhui regions of China. When purchasing DMSO online, it is important to…

Dimethyl sulfoxide (‌DMSO) ‌ is a kind of sulfur-containing organic compound, ‌ is known as “universal solvent”, ‌ because of its unique physical and chemical properties, ‌ has been widely used in many fields. ‌ Here are some instructions on how to use DMSO: ‌ Physical and chemical properties: ‌ Dimethyl sulfoxide is a colorless and odorless transparent liquid at room temperature, ‌ has strong hygroscopic property, ‌ freezing point is 18.55℃, ‌ density is close to water. ‌Chemically, ‌DMSO has the molecular formula (CH3)2SO, ‌ for having one hydrophilic thionyl group and two hydrophobic methyl groups in its structure, ‌ it is miscible with both aqueous solution and most organic solvents except petroleum ether. ‌ can dissolve about 80% of the compounds, ‌ including most of the water-soluble compounds and fat-soluble compounds. ‌Application field: ‌ Medical field: ‌DMSO is mainly used for drug dissolution in animal experiments, and the…

Raw materials: ‌ The main raw materials of Pvi /pvp copolymer include N-vinylpyrrolidone (‌NVP) ‌ and 1-vinylimidazole (‌VI) ‌. ‌ These raw materials need to be carefully prepared and screened ‌ to ensure their purity and quality. ‌ Polymerization reaction: ‌ mixture of raw material and initiator, ‌ added into the reactor, ‌ and polymerization reaction. ‌ The polymerization reaction can be carried out by solution polymerization, ‌ suspension polymerization or emulsion polymerization. ‌ In the process of reaction, ‌ need to control the appropriate temperature, ‌ pressure and reaction time, ‌ to ensure the effect and yield of polymerization. ‌ Separation and purification: ‌ After the polymerization, ‌ needs to be separated from the polymer for purification. ‌ The commonly used separation methods are solvent precipitation, ‌ distillation and concentration, etc. ‌ By these methods, ‌ can remove impurities and other by-products, ‌ to obtain relatively pure Pvi /pvp…