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Preparation method of modified cellulose/polylactic acid composite material

A composite material and cellulose technology, applied in chemical instruments and methods, lignin derivatives, organic chemistry, etc., to achieve the effects of increasing distance, facilitating chemical modification, and enhancing cellulose strength

Active Publication Date: 2019-05-24
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of polylactic acid to modified cellulose overcomes the application difficulties caused by the defects of high price, poor toughness, and low thermal deformation temperature of polylactic acid, reduces production costs, and makes polylactic acid a large-scale application in the industrial field. possible

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] A kind of preparation method of modified cellulose / polylactic acid composite material, this preparation method comprises the steps:

[0085] Step 1. Hydrolysis of hemicellulose

[0086] Take corn stalks and grind them to a length of 5cm to 10cm, mix the crushed corn stalks with a sulfuric acid solution with a concentration of 2wt% at a mass ratio of 1:5, hydrolyze under normal pressure for 60 minutes, and filter to obtain xylose after hydrolysis solution and hydrolyzed slag, concentrate the xylose solution to a concentration of 10wt% to 20wt%, transfer it to a furfural workshop, and prepare furfural by sulfuric acid catalyzed dehydration of xylose;

[0087] Step 2. Alkali-soluble lignin

[0088] Mix the hydrolyzed slag obtained in step 1 with a sodium hydroxide solution with a concentration of 5wt% at a mass ratio of 1:5, transfer the mixed material to a reactor, heat up to 120°C, and after constant temperature alkali treatment for 180min, cool down to 50°C. ℃~60℃, fi...

Embodiment 2

[0094] A kind of preparation method of modified cellulose / polylactic acid composite material, this preparation method comprises the steps:

[0095] Step 1. Hydrolysis of hemicellulose

[0096] Take corn stalks and grind them to a length of 5cm to 10cm, mix the crushed corn stalks with a sulfuric acid solution with a concentration of 2wt% at a mass ratio of 1:5, hydrolyze under normal pressure for 60 minutes, and filter to obtain xylose after hydrolysis solution and hydrolyzed slag, concentrate the xylose solution to a concentration of 10wt% to 20wt%, transfer it to a furfural workshop, and prepare furfural by sulfuric acid catalyzed dehydration of xylose;

[0097] Step 2. Alkali-soluble lignin

[0098] Mix the hydrolyzed slag obtained in step 1 with a sodium hydroxide solution with a concentration of 5wt% at a mass ratio of 1:5, transfer the mixed material to a reactor, heat up to 120°C, and after constant temperature alkali treatment for 180min, cool down to 50°C. ℃~60℃, fi...

Embodiment 3

[0106] A kind of preparation method of modified cellulose / polylactic acid composite material, this preparation method comprises the steps:

[0107] Step 1. Hydrolysis of hemicellulose

[0108] Take corn stalks and grind them to a length of 5cm-10cm, mix the crushed corn stalks with 2wt% sulfuric acid solution at a mass ratio of 1:5, hydrolyze under normal pressure for 60 minutes, and filter to obtain xylose after hydrolysis solution and hydrolyzed slag, concentrate the xylose solution to a concentration of 10wt% to 20wt%, transfer it to a furfural workshop, and prepare furfural by sulfuric acid catalyzed dehydration of xylose;

[0109] Step 2. Alkali-soluble lignin

[0110] Mix the hydrolyzed slag obtained in step 1 with 5 wt% sodium hydroxide solution at a mass ratio of 1:5, transfer the mixed material to a reactor, heat up to 120°C, and after constant temperature alkali treatment for 180min, cool down to 50°C. ℃~60℃, filter and separate to obtain alkali-dissolved slag and ...

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Abstract

A modified cellulose / polylactic acid composite preparation method belongs to the technical field of biomass energy chemical engineering and comprises the following steps: hemicellulose of maize straw is hydrolyzed through acid, and then maize straw is pretreated by alkaline-soluble lignin to prepare a cellulose precursor; the cellulose precursor is crushed and dispersed to prepare fibrillation cellulose, and then fire-retardant impregnation and low-temperature oxidation treatment are performed to obtain dehydroxylation cellulose; dehydroxylation cellulose is scattered, and low-temperature carbonization is performed to prepare carbon fibers; the fibrillation cellulose is oxidized by sodium hypochlorite to prepare carboxylated cellulose, and carboxylated cellulose and polyethylene glycol are esterified to prepare esterified cellulose; and dehydroxylation cellulose, the carbon fibers and the esterified cellulose are added into an internal mixer to be subjected to kneading mixing with polylactic acid, and an open mill is adopted for homogenization scattering to prepare a modified cellulose / polylactic acid composite. Cellulose is modified by different methods, particularly mechanical scattering and crushing, flame-retardant impregnation, low-temperature oxidation, high-temperature carbonization, carboxylation and esterification, so that the strength and the mobility of cellulose are improved, and the polylactic acid interfacial compatibility is improved.

Description

technical field [0001] The invention belongs to the technical field of biomass energy chemical industry, and relates to a preparation method of modified cellulose / polylactic acid composite material, in particular to mechanical dispersing and crushing, fire retardant impregnation, low-temperature oxidation, high-temperature carbonization, carboxylation and esterification, etc. Modified method, adding dehydroxylated cellulose, carbonized cellulose and esterified cellulose into internal mixer and kneading and mixing with polylactic acid, and then homogenized and dispersed through open mixer to prepare modified cellulose / polylactic acid composite material method. Background technique [0002] Polylactic acid (PLA) is a natural starch plastic, [0003] Moreover, it is the "pioneer" of biopolymers in the commercial market, which not only prepares raw materials from a wide range of sources, but also has sustainable development. Polylactic acid has good biocompatibility, degradabi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/02C08L67/04C08L1/08C08L1/32C08K7/06C08K3/04C08B37/14C08H7/00C08H8/00
CPCC07G1/00C08B37/0003C08H8/00C08K3/04C08K7/06C08L1/02C08L1/08C08L1/32C08L2201/08C08L67/04
Inventor 王晓峰崔希周玉朱燕超杨晓敏王子忱
Owner JILIN UNIV
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