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Benzimidazole ionic liquid aid used in rubber processing and preparation method thereof

A technology of benzimidazole and ionic liquid, applied in the field of rubber processing aids, can solve the problems of easy leaving mold scale and traces, uncommon release agent, mold corrosion, etc., and achieves low price, low production cost, and increased mechanical performance effect

Inactive Publication Date: 2011-09-07
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The external lubricants, film release agents, and mold release agents currently used in the market are generally not compatible with each other, and have the disadvantages of easily leaving mold scale and traces, corrosive effect on the mold, and relatively expensive.

Method used

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  • Benzimidazole ionic liquid aid used in rubber processing and preparation method thereof
  • Benzimidazole ionic liquid aid used in rubber processing and preparation method thereof
  • Benzimidazole ionic liquid aid used in rubber processing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of 1-benzylbenzimidazolium bromide ionic liquid

[0022] 1, the preparation of 1-benzylbenzimidazole

[0023] Add 2g benzimidazole, 20mL 40% NaOH and 0.2g (C 4 h 9 ) 4 NBr was heated to 55°C, and 2.4 mL of benzyl chloride was added under stirring. After reacting for 1 hour, a white solid precipitated out. The reaction mixture was poured into 50 mL of water and filtered. The filtered precipitate was dissolved in chloroform, washed 3 times with distilled water, and the organic phase was washed with anhydrous Na 2 SO 4 After drying, the solvent was evaporated under reduced pressure and recrystallized from benzene to obtain 1-benzylbenzimidazole.

[0024] 2. Preparation of 1-benzylbenzimidazolium bromate ionic liquid

[0025] Add 2.00 g of 1-benzylbenzimidazole and 30 mL of ethanol into the three-necked flask, and slowly add 2.00 mL of 6.93 mol / L HBr dropwise with stirring at room temperature. The reaction was stirred at room temperature for 2 hours. Et...

Embodiment 2

[0027] Preparation of 1-benzylbenzimidazole tetrafluoroborate ionic liquid

[0028] 1, the preparation of 1-benzylbenzimidazole

[0029] Add 2g benzimidazole, 30mL 40% NaOH aqueous solution and 0.3g (C 4 h 9 ) 4 NBr was heated to 55°C, and 3.5 mL of benzyl chloride was added under stirring. After 1.5 hours of reaction, a white solid precipitated. The reaction mixture was poured into 50 mL of water and filtered. The solid was dissolved in chloroform, washed three times with distilled water, and anhydrous Na 2 SO 4 dry. The solvent was distilled off under reduced pressure, and 1-benzylbenzimidazole was obtained by recrystallization from benzene.

[0030] 2. Preparation of 1-benzylbenzimidazole tetrafluoroborate ionic liquid

[0031] Weigh 2.45g of 1-benzylbenzimidazole, place it in a 100mL three-neck flask, add 30mL of acetone as a solvent, and stir at room temperature to completely dissolve the solid. Add 4mL 8mol / L HBF 4 aqueous solution, stirred at room temperature ...

Embodiment 3

[0033] Preparation of Ionic Liquid of 1-Benzylbenzimidazole Hexafluorophosphate

[0034] Weigh 2g of 1-benzylbenzimidazole obtained in Example 1, place it in a 250mL bottom flask, add 50ml of distilled water, then add 2mL of 10mol / L KPF 6 aqueous solution, stirred at room temperature for 1.5 hours, and evaporated the solvent under reduced pressure to obtain a crude product. The crude product was washed three times with ether, recrystallized from ethanol-ether (V / V, 1:1), and dried under vacuum at 70°C for 12 hours to obtain 1-benzylbenzimidazole hexafluorophosphate ionic liquid.

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Abstract

The invention relates to a benzimidazole ionic liquid aid used in rubber processing and a preparation method thereof. The method comprises the following steps of: (1) mixing benzimidazole, aqueous solution of NaOH and (C4H9)4NBr, heating to the temperature of 55DEG C, adding a reactant of benzyl chloride, reacting for 1 to 1.5 hours, cooling, filtering, dissolving a solid by using chloroform, washing with distilled water, drying with anhydrous Na2SO4, steaming out a solvent under reduced pressure, and recrystallizing with benzene to obtain 1-benzyl-benzimidazole; and (2) dissolving the 1-benzyl-benzimidazole in a solvent, adding aqueous solution of HB for reaction, steaming out the solvent under reduced pressure, and performing washing, recrystallization and vacuum drying to obtain 1-benzyl-benzimidazole ionic liquid. Required raw materials of the benzimidazole ionic liquid aid are sold in market, wide in sources and low in prices; and the product yield in each step is high, the process is simple, and the production cost is low. The product can serve as an external lubricant, film separant and release agent in rubber processing.

Description

technical field [0001] The invention relates to a rubber processing aid, in particular to a benzimidazole ionic liquid, which can be used as an external lubricant, a film release agent and a release agent in the rubber processing process. Background technique [0002] In the molding process of rubber products, rubber must be vulcanized under high temperature and high pressure to become rubber products of various shapes with excellent mechanical properties. During the processing, the mold sticking problem often occurs when the mold is removed, resulting in surface defects of the product and affecting product quality. In order to prevent sticking to the mold when the rubber is vulcanized, in addition to a reasonable mold design, lubrication measures are usually taken. Lubricants are divided into external lubricants and internal lubricants. The main function of the external lubricant is to form an isolation layer, reduce the adhesion between the rubber and the surface of the ...

Claims

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Application Information

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IPC IPC(8): B29C33/60C07D235/08C08L21/00
Inventor 高勇陈庆华肖荔人刘欣萍游楚楚姜明汤营茂
Owner FUJIAN NORMAL UNIV
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