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Method for preparing high specific strength polyethylene/alkali lignin foam material

A technology of alkali lignin and foaming materials, which is applied in the field of preparation of high specific strength polyethylene/alkali lignin foaming materials, can solve the problems of flammability, poor heat resistance, and low strength, and achieve molecular polarity reduction, Improved compatibility and enhanced strength

Inactive Publication Date: 2014-04-30
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method for preparing high specific strength polyethylene / alkali lignin foam material in order to solve the problems of low strength, poor heat resistance and flammability of the low density polyethylene foam material in the prior art

Method used

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  • Method for preparing high specific strength polyethylene/alkali lignin foam material
  • Method for preparing high specific strength polyethylene/alkali lignin foam material
  • Method for preparing high specific strength polyethylene/alkali lignin foam material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Purification and alkylation modification of alkali lignin

[0033] Extraction of alkali lignin: Fully dissolve an appropriate amount of alkali lignin in 1mol / L sodium hydroxide solution, filter to remove insoluble impurities, then adjust the pH value of the solution to 2 with 1mol / L hydrochloric acid, filter, and distill the precipitate Wash well to neutral.

[0034] Alkylation modification: fully dissolve the above-mentioned purified alkali lignin in a mixed solvent of isopropanol-water with a volume ratio of 2:1, adjust the pH to 12 with NaOH, and react with bromododecane at 140°C for 3 hours, The mass ratio of alkali lignin to bromododecane is 10:3. The product is precipitated and washed in aqueous hydrochloric acid solution, and the unreacted long-chain haloalkanes are washed away with dichloroethane. The product is dried at 100°C for 12 hours for use.

[0035] (2) Plasticizing:

[0036] Prepare the raw materials in the following parts by mass:

[0037]

...

Embodiment 2

[0043] Except that the mass parts of the alkylated modified alkali lignin in step (2) was changed to 30 parts, other steps were carried out in the same manner as in Example 1.

Embodiment 3

[0045] Except that the mass parts in step (2) are changed to: 30 parts of alkylated modified alkali lignin, 5 parts of azodicarbonamide, 2.5 parts of sodium bicarbonate, 1 part of zinc oxide, 1.25 parts of citric acid, and others according to The same steps as in Example 1 were carried out.

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Abstract

The invention provides a method for preparing a high specific strength polyethylene / alkali lignin foam material. According to the method, low density polyethylene and alkylation modified alkali lignin are taken as the raw materials, a lubricant, an antioxidant, a cross-linking agent, a foaming agent and a blowing promoter are added, and the foam material is prepared through plastication and mold pressing foaming. Alkylation modification is carried out on the alkali lignin by chloralkane or alkyl bromide, the molecular polarity of the alkali lignin is lowered, the compatibility of the alkali lignin and the foam material is improved, the alkali lignin can improve the strength and heat stability of the foam material, furthermore, the problem of treatment of alkali lignin waste is solved at a certain degree, so that the method has certain environmental benefits.

Description

technical field [0001] The invention relates to a preparation method of a high-specific-strength polyethylene / alkali lignin foaming material, and belongs to the technical field of polymer foaming materials. Background technique [0002] Low-density polyethylene foam has low density, large specific volume, good thermal insulation and flexibility, and excellent sound absorption, so it is widely used in construction, chemical and packaging fields. But at present, there are some deficiencies in low-density polyethylene foam, such as poor heat resistance, low strength, easy to burn, etc., so it is of practical significance to modify it. [0003] Lignin is a renewable and widely sourced organic resource, second only to cellulose in reserves, and is a three-dimensional polymer network compound with phenylpropane structural units. Alkali lignin is a by-product of alkaline pulping in my country's paper industry. This industrial alkali lignin retains the lignin macromolecular skeleto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L97/00C08J9/10C08J9/08C08K13/02C08K3/22C08K5/09C08K5/14C08K5/134B29C44/60
CPCC08L23/06B29C44/60C08J9/0061C08J9/08C08J9/103C08J2203/02C08J2203/04C08J2203/18C08J2323/06C08J2497/00C08L2201/08C08L2203/14C08L2205/025C08L2205/03C08L2207/066
Inventor 冯钠李季张桂霞樊明帅谷宇
Owner DALIAN POLYTECHNIC UNIVERSITY
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