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Imidazole-type ionic liquid and application thereof to degradation of polyformaldehyde

A technology of ionic liquid and imidazole type, which is applied in the field of imidazole type ionic liquid and its application in the degradation of polyoxymethylene, can solve the problems of slow degradation of polyoxymethylene, difficult disposal of waste residue, environmental pollution, etc., and achieve consumption saving, thorough decomposition, Effect of reducing solvent volatilization loss

Active Publication Date: 2017-02-15
LINZHOU KENENG MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of use, there will be natural aging phenomena such as cracking, deformation, and pulverization, resulting in a large amount of waste polyoxymethylene. In addition to slow natural weathering, the conventional polyoxymethylene degradation uses strong acid as a catalyst. The use of strong acid is harmful to the environment. Cause pollution, the inevitable volatilization during use will also cause harm to human body and equipment, and the generated waste residue is difficult to deal with

Method used

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  • Imidazole-type ionic liquid and application thereof to degradation of polyformaldehyde
  • Imidazole-type ionic liquid and application thereof to degradation of polyformaldehyde
  • Imidazole-type ionic liquid and application thereof to degradation of polyformaldehyde

Examples

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Effect test

Embodiment 1

[0026] A kind of imidazole type ionic liquid, its cationic composition is: [ATMIM] 3+ (1,2,3-(3-N-methylimidazolyl)-1-propene), the structural formula is shown in formula (1), and the anion is [p-TSA] - 、[CH 3 COO] - , [HSO 4 ] - , [H 2 PO 4 ] - 、[CF 3 SO 3 ] - 、[CH 3 SO 3 ] - any one or a mixture of two or more;

[0027] Formula 1).

[0028] The preparation method of imidazole type ionic liquid as above may further comprise the steps:

[0029] (1) [ATMIM]Cl 3 Preparation of [1,2,3-(3-N-methylimidazolyl)-1-propene trichloride]: Take 1,2,3-trichloropropene and N-methylimidazole, add to hydrothermal reaction kettle , the molar ratio of the two is 1: (3-6); add 0.1%-1.0% of the raw material mass of γ-alumina and 0.5‰-10‰ of octadecyltrimethylammonium chloride as a catalyst, seal , heated to 220-280°C and stirred for 24-72h, cooled, extracted and purified with ethyl acetate, chloroform, acetone or carbon tetrachloride, and dried to obtain [ATMIM]Cl 3 ;

[00...

Embodiment 2

[0040] The ionic liquid provided by this embodiment is [ATMIM][HSO 4 ] 3 (1,2,3-(3-N-methylimidazolyl)-1-propene trihydrogensulfate), the cation is [1,2,3-(3-N-methylimidazolyl)-1-propene 】 3+ , the anion is [HSO 4 ] - , its preparation method and the method of catalyzing polyoxymethylene are as follows:

[0041] 1. [ATMIM]Cl 3 Preparation of (1,2,3-(3-N-methylimidazolyl)-1-propene trichloride)

[0042]Take 145.41g (1.00mol) of 1,2,3-trichloropropene and 396.45g (4.50mol) of N-methylimidazole, put them into a hydrothermal reaction kettle, add 3.00g of γ-alumina and 1.00g of Octadecyltrimethylammonium chloride, sealed, heated to 280°C and stirred for 48 hours, cooled to room temperature, washed and filtered three times with 400mL ethyl acetate each time, and the white solid obtained was stored in a vacuum drying oven using di Phosphorus was dried at 80°C for 36 hours to finally obtain 254.8 g of a white solid product with a yield of 65.0%.

[0043] 2. [ATMIM][HSO 4 ] ...

Embodiment 3

[0047] Except adding 12.0g of polyoxymethylene particles, all the others are the same as in Example 2. Under this condition, the degradation rate of polyoxymethylene is 93.23%, and the formaldehyde is collected to 92.73%.

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Abstract

The invention discloses an imidazole-type ionic liquid. Positive ions of the ionic liquid consist of [ATMIM]<3+>, and negative ions consist of a mixture of any or more than two of [p-TSA]<->, [CH3COO]<->, [HSO4]<->, [H2PO4]<->, [CF3SO3]<-> and [CH3SO3]<->. Compared with the prior art, the imidazole-type ionic liquid has the advantages that the positive ions have three positive charges, and the negative ions have three ionic groups, so that the imidazole-type ionic liquid has higher acidity than the conventional ionic liquid; when being applied to catalytic degradation of polyformaldehyde, the imidazole-type ionic liquid has the advantages that the steam pressure is eliminated basically, volatilization pollution is avoided, solvent volatilization loss is reduced greatly, and the environmental pollution is lowered; the polyformaldehyde degradation reaction condition is mild, the degradation time is short, the degradation rate is high, and complete decomposition is realized; the using amount of an acid catalyst can be reduced, and equipment corrosion is lowered; the imidazole-type ionic liquid is easy to recover after being catalyzed, and can be recycled after a reaction.

Description

technical field [0001] The invention belongs to the technical field of ionic liquids, in particular to an imidazole-type ionic liquid and its application in degrading polyoxymethylene. Background technique [0002] Polyoxymethylene is a thermoplastic resin and an important engineering plastic. It is the toughest among thermoplastic resins. It has high heat resistance, bending strength and fatigue resistance, and excellent wear resistance and electrical properties. POM has been widely used in electronics, machinery, instrumentation, daily light industry, automobiles, building materials, agriculture and other fields. In many new fields of application, such as medical technology, sports equipment, etc., polyoxymethylene also shows a good growth trend. However, in the process of use, there will be natural aging phenomena such as cracking, deformation, and pulverization, resulting in a large amount of waste polyoxymethylene. In addition to slow natural weathering, the convention...

Claims

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Application Information

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IPC IPC(8): C07D233/58B01J31/02C07C45/55C07C47/045
CPCB01J31/0284C07C45/55C07D233/58C07C47/04
Inventor 李凯明李伟董志勇鲍超郑勇张君芳
Owner LINZHOU KENENG MATERIAL TECH
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