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A kind of method that carries out cellulose lactic acid modification in ionic liquid

An ionic liquid and cellulose technology, which is applied in the preparation of renewable degradable materials and in the field of green environmental protection, can solve problems such as harsh preparation conditions, and achieve the effects of simple and fast post-processing, mild conditions, and simple and easy process.

Inactive Publication Date: 2016-08-24
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the technical problem of harsh preparation conditions of existing cellulose ester materials, and provides a method for modifying cellulose lactic acid in ionic liquid

Method used

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  • A kind of method that carries out cellulose lactic acid modification in ionic liquid
  • A kind of method that carries out cellulose lactic acid modification in ionic liquid
  • A kind of method that carries out cellulose lactic acid modification in ionic liquid

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specific Embodiment approach 1

[0019] Embodiment 1: A method for modifying cellulose lactic acid in ionic liquid according to the present embodiment is carried out according to the following steps:

[0020] 1. Add the cellulose and the ionic liquid into the container, feed nitrogen gas and heat with an oil bath, stir and dissolve the cellulose in the solution to obtain a cellulose ionic liquid solution;

[0021] 2. Add lactic acid and catalyst to the cellulose ionic liquid solution prepared in step 1, then evacuate until the vacuum degree is -0.09~-0.095MPa, feed nitrogen gas to make the vacuum degree in the container reach -0.09~-0.1MPa, and heat up After reaching 75-120°C, keep stirring for 6-48 hours, and then lower to normal temperature to obtain the reaction product;

[0022] 3. Pour the reaction product obtained in step 2 into regeneration liquid to regenerate, wash with water or ethanol, and dry in vacuum to obtain cellulose lactate.

specific Embodiment approach 2

[0023] Embodiment 2: The difference between this embodiment and Embodiment 1 is that when the oil bath is heated in step 1, the temperature of the oil bath is 60-120°C. Others are the same as the first embodiment.

specific Embodiment approach 3

[0024] Embodiment 3: The difference between this embodiment and Embodiment 1 is that when the oil bath is heated in step 1, the temperature of the oil bath is 90-110°C. Others are the same as the first embodiment.

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Abstract

The invention relates to a method for modifying cellulose lactic acid in an ionic liquid. The invention relates to a method for modifying cellulose. The invention aims to solve the technical problem of harsh preparation conditions of existing cellulose ester materials. Method: Dissolve cellulose in ionic liquid, then add lactic acid and catalyst, under nitrogen protection, reduce pressure, heat to make cellulose and lactic acid undergo esterification reaction, then add the reaction product into the regeneration solution to regenerate, wash, After drying, cellulose lactate is obtained. The invention uses cheap raw materials, simple process, no pollution in the reaction process, reusable reaction system, and the prepared cellulose lactate can be used as a degradation material.

Description

technical field [0001] The invention relates to the preparation of a regenerated degradable material and environmental protection, in the field of renewable resources, in particular to a preparation method using ionic liquid cellulose lactate. Background technique [0002] Cellulose material is the earliest human use of natural polymer materials. However, with the rise of synthetic polymers, the proportion of cellulose materials in polymer materials has decreased year by year. However, since the 1970s, with the massive consumption of non-renewable resources (such as oil, natural gas, coal mines and metal deposits, etc.), the development and utilization of natural polymers has aroused the world's attention again. As the most abundant natural polymer material in nature, cellulose has attracted much attention in its development and utilization. Cellulose grows and exists in a large number of green plants. It is a highly crystalline polymer with high molecular weight. It does ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B3/14
Inventor 孙立国窦天威田君端学东
Owner HEILONGJIANG UNIV