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Method for preparing cellulose eleostearate

A technology of cellulose and eleostearate, which is applied in the field of homogeneous preparation of cellulose eleuate, can solve the problems of no continuous cross-linking reaction, inability to further form molecular weight products, etc., and achieves good thermoplastic effect.

Inactive Publication Date: 2012-04-25
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These cellulose higher fatty acid esters do not have the characteristics of continuing the cross-linking reaction, and cannot further form products with higher molecular weight

Method used

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  • Method for preparing cellulose eleostearate
  • Method for preparing cellulose eleostearate
  • Method for preparing cellulose eleostearate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 1 gram of microcrystalline cellulose and 9 grams of 1-N-n-butyl-3-trimethylimidazolium chloride into a 50-ml round-bottomed flask, raise the temperature to 100°C, and stir for about 20 minutes to make the microcrystalline cellulose The element was completely dissolved in 1-N-n-butyl-3-trimethylimidazolium chloride. Heating was stopped, and the temperature of the solution was maintained at 90° C., 9.34 g of stearyl chloride was added dropwise, and the reaction was completed in 1.5 hours. Add 200 milliliters of methanol in the reaction flask, and stir for 10 minutes, the cellulose sulphonic acid ester is precipitated from the solution, and is suction-filtered under reduced pressure with a Buchner funnel, and then 400 milliliters of methanol are used to depressurize the cellulose sulphonic acid ester in Buchner's suction. Wash and suction filter in the filter funnel 3 times, store the filtrates after suction filtration, put the solid product on the filter paper into a ...

Embodiment 2

[0027] Dissolve 10 g of the cellulose savage ester prepared in Example 1 in chloroform, apply it evenly on the polished and derusted tinplate test piece with an applicator, and dry it naturally at a temperature of 25 ° C for 24 hours, and the coating film thickness is 25 to 40 Microns. The samples were then further cross-linked under UV light for 2 hours. The samples before cross-linking and after cross-linking were tested according to the standard GB / T 6739-1996 for the pencil hardness test of the paint film, according to the standard GB / T1732-93 for the impact strength test of the paint film, and for the paint film according to the standard GB 1720-79 Adhesion test, according to the standard GB 1731-93 to perform the paint film flexibility test. Scrape the samples before and after crosslinking from the tinplate sheet with a knife, prepare 10% tetrahydrofuran solution and filter them, and test the weight average molecular weight on the American waters 1515 gel chromatograph,...

Embodiment 3

[0031] 600 ml of the suction-filtered filtrate described in Example 1 was added into a 2000 ml round-bottomed flask, methanol was distilled off, and 590 ml of methanol was recovered. The remaining liquid is distilled to recover 1-N-n-butyl-3-trimethylimidazolium chloride.

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Abstract

The invention discloses a method for preparing cellulose eleostearate, which comprises the following steps of: dissolving cellulose into ionic liquid to obtain 1 to 10 percent cellulose solution, adding eleostearic acid acyl chloride in an amount which is 3 to 5 times the amount of substances of glycidyl glucose units in the cellulose drop by drop, reacting the mixture for 1 to 2 hours at the temperature of between 80 and 90 DEG C, adding methanol into the reaction product, stirring and settling to obtain a raw product, suction filtering under reduced pressure, washing the raw product by using methanol, and drying in vacuum to obtain a product. The product can be further cross-linked into a material with higher molecular weight and better performance under the irradiation of ultraviolet light. The product has low glass transition temperature and melting temperature, and the melting range is between 33.86 and 81.75. Compared with a method using N,N-dimethyl formamide and lithium chloride salt as a solvent system, the method has the advantages that the solvent is easy to reclaim, an acid binding agent is not needed and the prepared cellulose eleostearate has good plasticity.

Description

technical field [0001] The invention relates to a new method for preparing cellulose higher fatty acid esters, in particular to a method for homogeneously preparing cellulose lyceate with an ionic liquid as a solvent. Background technique [0002] Cellulose is the most abundant natural polymer in nature. Natural and modified celluloses are of great commercial and scientific importance in industrial production. The previous heterogeneous synthesis of cellulose derivatives can only be modified in the amorphous region of cellulose, the reaction accessibility is not high, and the changes to various physical and chemical properties of cellulose are extremely limited. In order to change the solubility and thermoplastic properties of cellulose, the homogeneous synthesis of cellulose fatty acid esters is a hot research field in the chemical modification of cellulose. [0003] Higher cellulose fatty acid esters can be dissolved in various organic solvents, have good thermoplasticit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B3/10
Inventor 夏建陵黄坤李梅万厉杨小华张燕陈瑶
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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