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product description

1,*-Dimethyl**-imidazolidinone (DMI CAS: ******9) is a colorless, transparent, low-viscosity liquid with a characteristic odor of fatty amines. Viscosity (*5 ° C) 1.**4 cps, DMI can be miscible with water, ethanol, ether, acetone, chloroform and other organic solvents, but insoluble in petroleum ether, cyclohexane and so on. Strong polarity, excellent solubility, acid and alkali resistance. Boiling point: ******6 ° C Melting point: 8.2 ° C Flash point: **0 ° C Refractive index n*0 / D: 1.***0 Relative density: 1.**4.
use
As an aprotic strong polar solvent, 1,*-dimethyl**-imidazolidinone has special physical and chemical properties and is widely used in medicine, refining, dyes/pigments, microelectronics, engineering plastics, cleaning. With fields such as surface treatment.
In the field of medicine, it has a remarkable effect as a transdermal absorption agent for drugs. In the field of polymers, it can promote the mixing of raw materials and catalysts, improve the chemical, thermal and mechanical properties of polymers; in the field of liquid crystal materials, high-quality porous ultrafiltration membranes can be obtained. It is a liquid crystal locating agent with stable storage performance; it is used as an organic reaction solvent to promote intermolecular and intramolecular condensation reactions to prepare macromolecular heterocyclic compounds, and nucleophilic substitution, reduction, oxidation, elimination, halogen under alkaline conditions. The application of exchange reaction, Kolbe-Schmitt reaction and Ullmann reaction has good effects.
 
1 reaction solvent
Due to its excellent thermal and chemical stability, DMI has solubility in inorganic, organic compounds and various resins, and its catalytic action as an aprotic polar solvent makes it a particularly effective reaction solvent. . With DMI, it is possible to increase the yield and effectively control side reactions while shortening the reaction time.
DMI can effectively promote various nucleophilic substitution reactions, such as the synthesis of phenyl ether derivatives, amino compounds, and fluorobenzene derivatives. Its high dielectric constant and solvation of cations can catalyze anion nucleophilic reactions. These synthetic products are used as intermediates in the synthesis of agrochemicals, pharmaceuticals, dyes, and monomers of high performance resins.
 
2 petroleum products
DMI has high boiling point and high thermal stability and is not easy to form an azeotrope with other substances. Therefore, it can be applied in many industrial processes such as liquid-liquid extraction, countercurrent distribution, extractive distillation and countercurrent washing. DMI is a good BTX (benzene, toluene and xylene) extractant because it dissolves aromatic compounds and unsaturated hydrocarbons but does not dissolve paraffins.
 
3 polymer reaction solvent
DMI is the only solvent used in the production of heat-resistant thermoplastics. It is also effective as a solvent for various polymer synthesis processes and as a cleaning agent for polymerization and plastic molding. In the production of polyamide and polyimide resins, DMI accelerates the formation of amide and imine groups to give high molecular weight polymers, and the resulting solution is suitable for solution spinning to obtain high temperature resistant polyimide fibers.
In the production of polyphenylene sulfide resin (PPS), electronic materials having a very small amount of organic impurities can be obtained by DMI. In the production of polyphenylene ether sulfone resin, DMI can effectively control the occurrence of side reactions and obtain high quality polymer products. When the polyimide resin and the polysulfone resin are formed into a film and the polyetherketone resin film is stretched, treatment with DMI can make the film more uniform.
 
4 lithography process stripper
Due to its low viscosity and high dielectric constant, DMI can be used as an electrolyte solvent for high performance lithium batteries. In addition, it has strong penetrating power, high boiling point and high temperature resistance, and it can also be used as a stripping agent for silicon chip photoresist. Its rapid peeling and non-corrosive properties can greatly simplify the stripping process and accelerate the chip production rate.
 
5 detergent
Adding DMI to a mixture of surfactants, bases, alcohols and polyoxyethylene alkyl ethers gives a strong detergent. Because DMI is very easy to dissolve dirt, it can also be used to formulate a highly effective cleaning solution for cleaning glass and metal.
6 Dyes and pigments
The ink made by mixing DMI with solvent components and dyes and pigments can be printed with contrast and the image is clear.
 
 
7 surface treatment agent
DMI can be used as a surface treatment agent to improve the bonding strength of ABS, polyimide, PPS, PTFE and other materials to epoxy resin adhesives.
 
8 DMI and NMP (N-methylpyrrolidone)
DMI is similar in structure to NMP, with similar performance and application areas, but there are significant differences in performance between the two:

A. Toxicity
Although NMP is a low-volatility, low-toxic solvent, recent research has found that NMP has potential reproductive toxicity. Some parts of the United States and Europe have restricted its use. For example, paints, graffiti cleaners, pesticides, etc. may be exposed to NMP vapor in large quantities. All prohibited. More stringent restrictions may be imposed in the future. DMI currently has no relevant toxicity reports, it can widely replace the strong carcinogenic solvent HMPA (Hexamethylphosphoramide).
B. Hydrolysis resistance
Both NMP and DMI are lactams. Because the amide bond is easily hydrolyzed, the use conditions of the amide solvent are limited. For example, DMF decomposes itself to dimethylamine and carbon monoxide at a high temperature (**0 ° C), and decomposes at a small temperature at room temperature; in the presence of a strong base (such as KOH, NaOH, AcONa), which decomposes rapidly under anhydrous conditions at normal temperature and may explode at high temperatures. NMP is more stable than DMF, but it is also prone to decomposition under alkaline conditions (4% sodium hydroxide is decomposed by about ****0% for 8 h) and is stable under acidic conditions. Due to the structure of urea, DMI reduces the dipole due to the conjugation effect, and the carbonyl reactivity is lowered. On the other hand, the five atoms on the ring are coplanar, so that the chance of attacking the carbonyl group in the ring by the nucleophile is reduced. Therefore, DMI is quite stable under high temperature alkaline conditions and does not undergo rapid decomposition. Compared to NMP, DMI's range of applications has been extended to apply to reactions under alkaline conditions.
C. Organic reaction
The N atom on DMI corresponds to a larger pKa of the acid than NMP, which means that DMI is more suitable as a nucleophilic substitution reaction solvent. At the same time, DMI has a higher boiling point and stability and is suitable for use in areas where solvent evaporation is required. At the same time, DMI has better solubility, and the inorganic substance, the organic substance and the polymer can form a solution, and the reaction system is uniform, and the reaction is promoted sufficiently quickly. In particular, DMI as a solvent can accelerate the reaction rate and yield of a large amount of a metal salt (LiCl, CuI, etc.) as a catalyst.