Method for preparing corn straw cellulose membrane by using corn straw as raw material

Abstract

The invention provides a method for preparing a corn straw cellulose membrane by using corn straw as a raw material. The method is characterized by specifically comprising the following steps: crushing corn straw pulp, and adding into a sodium hydroxide solution; stirring for reaction for 2-3h under the condition that the temperature is 55-90 DEG C; performing suction filtration, washing and vacuum drying; adding an acetic acid/nitric acid mixed solution into cellulose after drying; stirring for reaction for 10-40min under the condition that the temperature is 70-90 DEG C; performing suction filtration, washing and vacuum drying to obtain corn straw cellulose; preparing a sodium hydroxide/thiourea mixed aqueous solution, and pre-cooling to -18--8 DEG C; adding the corn straw cellulose into the sodium hydroxide/thiourea mixed aqueous solution, and stirring for 10-30min to obtain a membrane casting solution; and performing membrane scraping on a glass plate, and forming a membrane by putting into an acetone/water mixture, thereby obtaining a corn cellulose membrane. The corn cellulose membrane prepared by the method provided by the invention has good mechanical properties, can be applied as a packaging film, a mulching film and a separation membrane, is low in raw material price and simple in operation and has a broad application prospect.

Description

technical field [0001] The invention belongs to the field of cellulose films, in particular to a method for preparing corn stalk cellulose films by using corn stalks as raw materials. Background technique [0002] my country is a large agricultural country, with an annual renewable capacity of 600 million tons of straw, among which corn stalk resources rank first in the world, and it is the renewable biomass energy with the largest output in my country, with an annual output of 220 million tons (Wang Guanbin, Zhao Guanghui, Li Jun Ping. Comprehensive Utilization of Corn Cob Resources [J]. Food and Drugs, 2006, 8(01A): 55-57.) Corn stalks are rich in cellulose, hemicellulose, lignin and other important chemical raw materials, if Being able to extract these raw materials from straw will reduce the burden of fossil fuels. However, in my country, corn straw, an important biomass resource, is absolutely used to replace wood to make paper, artificial boards and fields, except for a ...

AI Technical Summary

Problems solved by technology

[0002] my country is a large agricultural country, with an annual renewable capacity of 600 million tons of straw, among which corn stalk resources rank first in the world, and it is the renewable biomass energy with the largest output in my country, with an annual output of 220 million tons (Wang Guanbin, Zhao Guanghui, Li Jun Ping. Comprehensive Utilization of Corn Cob Resources [J]. Food and Drugs, 2006, 8(01A): 55-57.) Corn stalks are rich in cellulose, hemicellulose, lignin and other important chemical raw materials, if Being able to extract these raw materials from straw will reduce the burden of fossil fuels. However, in my country, corn straw, an important biomass resource, is absolutely used to replace wood to make paper, artificial boards and fields, except for a small part. Most of them are used by people to burn for heating, which not only wastes resources, but also pollutes people's living environment with the smoke and particles produced by burning, causing great harm to people's health

In some rural areas of our country, corn stalks are also used to feed livestock, etc. Most of the corn stalks are cellulose, which cannot be fully digested and absorbed in the livestock body, making its nutritional value low and not suitable for direct use.

[0003] Natural biomass has existed in nature for tens of thousands of years, and its composition and structure must be very stable. This has become the biggest difficulty for us to use cellulose. At present, the utilization rate of straw cellulose is very low.