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Preparing method for hydroxypropyl methyl cellulose crosslinked membrane

A technology of hydroxypropyl methylcellulose and cross-linked film is applied in the preparation of corn silk cellulose acetate nanocrystal reinforced hydroxypropyl methyl cellulose cross-linked film, and in the field of polymer transparent film, which can solve the problem of resource utilization Low utilization rate, on-site incineration of corn stalks, low economic coefficient and other problems, to achieve the effects of low environmental degradability, high quality, low toxicity, and strong light transmission

Active Publication Date: 2017-03-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the output of corn stalks is huge, its economic coefficient is low and the utilization rate of resources is low. Most of the corn stalks are wasted or burned on site, causing serious waste of resources and environmental pollution.
In the stage of laboratory research, most of the raw materials used are corn husks and corn husks, but there are few targeted studies on other parts of corn plants, such as corn silk

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0029] Example 1: The preparation method of the corn silk cellulose acetate nanocrystalline reinforced hydroxypropyl methylcellulose cross-linked film, the specific operation is as follows:

[0030] (1) Preparation process of corn silk

[0031] Corn silk is separated and collected from corn plants and air-dried. The water content of the air-dried raw material is 8%. Then the air-dried material is cut to 5cm and crushed mechanically. It is sieved with a standard sieve and passed through a 80-mesh sieve. , but only the part of the 150-mesh sieve is qualified raw material;

[0032] (2) Preparation process of cellulose acetate nanocrystals

[0033] Take 0.1g of absolute dry corn silk raw material (because the air-dried raw material contains 8% water, weighing 0.1 / (100-8)%=0.11g air-dried material) into 1.0g of TBAA / DMAc mixed solution (0.14gTBAA and 0.86gDAMc) , stirred at 50°C for 60 minutes, added dropwise 0.5g of acetic anhydride, and continued to react at the same temperatur...

Embodiment 2

[0041] Embodiment 2: The preparation method of this corn silk cellulose acetate nanocrystalline reinforced hydroxypropyl methylcellulose cross-linked film, the specific operation is as follows:

[0042] (1) Preparation process of corn silk

[0043] Corn silk is separated and collected from corn plants and air-dried. The water content of the air-dried raw material is 20%. Then the air-dried material is cut to 3cm and crushed mechanically. It is sieved with a standard sieve and passed through a 180-mesh sieve. , but only the part of the 300-mesh sieve is a qualified raw material;

[0044] (2) Preparation process of cellulose acetate nanocrystals

[0045] Take 0.5g of absolute dry corn silk raw material (because the air-dried raw material contains 20% water, weighing 0.5 / (100-20)%=0.63g air-dried material) into 30g of TBAA / DMAc mixed solution (1.8gTBAA and 28.2gDAMc), Stir at 65°C for 30 minutes, add 4.0 g of acetic anhydride dropwise, and continue to react for 2 hours at the s...

Embodiment 3

[0053] Embodiment 3: The preparation method of this corn silk cellulose acetate nanocrystal reinforced hydroxypropyl methylcellulose cross-linked film, the specific operation is as follows:

[0054] (1) Preparation process of corn silk

[0055] Corn silk is separated and collected from corn plants and air-dried. The water content of the air-dried raw material is 30%. Then the air-dried material is cut to 1cm and crushed mechanically. It is sieved with a standard sieve and passed through a 220-mesh sieve. , but only the part of the 400-mesh sieve is a qualified raw material;

[0056] (2) Preparation process of cellulose acetate nanocrystals

[0057]Take 1g of absolute dry corn silk raw material (because the air-dried raw material contains 30% water, weighing 1 / (100-30)%=1.43g air-dried material) into 100g of TBAA / DMAc mixed solution (4.8gTBAA and 96.0gDAMc), in Stir at 80°C for 10 minutes, add 10 g of acetic anhydride dropwise, and continue the reaction at the same temperatur...

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Abstract

The invention discloses a preparing method for a hydroxypropyl methyl cellulose crosslinked membrane. According to the method, collected corn stigmas are subjected to air drying, clipping, grinding and screening, powdery raw materials are obtained, the screened corn stigmas are scattered in a TBAA / DMAc ionic solution, cellulose nanocrystalline is dissociated and subjected to the esterification reaction with dripped acetic anhydride, and cellulose acetate nanocrystalline is prepared; the above modified cellulose nanocrystalline and the hydroxypropyl methyl cellulose DMAc dissolving solution are mixed, glutaric anhydride is added, after forming in a die and low-temperature drying film forming, the heating esterification cross-linking reaction is conducted, a product is cleaned, and after cold drying, the corn stigma modified cellulose blended film is obtained. A mulching film prepared through the method is a transparent film, high tensile performance and pull-up performance are achieved, and good waterproof performance and oxygen isolation performance are achieved.

Description

technical field [0001] The invention relates to a process technology for preparing an environment-friendly and high-mechanical-strength polymer transparent film by utilizing the agricultural solid waste---corn silk, especially a kind of corn silk cellulose acetate nanocrystal reinforced hydroxypropyl The invention discloses a method for preparing a methyl cellulose cross-linked film, belonging to the technical field of natural polymer modified materials. Background technique [0002] Thin films have been developed and used since the early 19th century. At that time, most of the films used by people were polyolefin films, among which the high barrier polyvinyl dichloride (PVDC) films successfully developed by the American DOW Chemical Company in the 1940s were widely used. [1] , plays an important role in many fields such as food, medicine, chemicals, and electronic device packaging, but PVDC films will release harmful gases during long-term use, which is not good for the hu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/12C08L1/28C08K5/09C08J5/18C08J3/24C08B3/06
CPCC08B3/06C08J3/246C08J5/18C08L1/12C08J2301/12C08L2203/16C08L2201/10C08J2401/28C08L1/284C08K5/09
Inventor 高欣张恒陈克利何洁
Owner KUNMING UNIV OF SCI & TECH
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