Lignin/polyvinyl alcohol composite material and preparation method thereof

A technology of polyvinyl alcohol and composite materials, applied in the field of polymer materials, can solve the problems of low toughness, low composite film strength, and poor compatibility of PVA composite films, and achieve improved interface compatibility, low cost, and promotion of dispersion Effect

Active Publication Date: 2018-12-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

People such as Guanhao Xu directly blend alkali lignin with PVA solution, and the compatibility between lignin and PVA is poor, and the composite film strength obtained is low, toughness is poor; People such as Ling Su [BioResources.2014,9 (3): 4477-4488.] Blending industrial alkali lignin with PVA, adding formaldehyde as a crosslinking agent, the obtained PVA composite film has low toughness, and the preparation process uses the toxic reagent formaldehyde

Method used

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  • Lignin/polyvinyl alcohol composite material and preparation method thereof
  • Lignin/polyvinyl alcohol composite material and preparation method thereof
  • Lignin/polyvinyl alcohol composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Parts by mass, g / mL, take 4.975 parts by mass of polyvinyl alcohol, 0.025 parts by mass of lignin, 0.025 parts by mass of sodium chloride, and add 100 parts by volume of water; at a heating temperature of 90°C, stir mechanically at 50 rpm for 3 hours, and fully dissolve The mixed solution of the mixed solution is cast into a film, and the lignin / polyvinyl alcohol composite material can be obtained after the water is naturally volatilized at room temperature. Wherein, the selected polyvinyl alcohol Mw=130000g / mol, and the degree of hydrolysis is 99%. The selected lignin is lignosulfonic acid, a by-product of sulfite pulping.

Embodiment 2

[0032] Parts by mass, g / mL, take 4.95 parts by mass of polyvinyl alcohol, 0.05 parts by mass of lignin, 0.05 parts by mass of sodium chloride, and add 100 parts by volume of water; at a heating temperature of 80°C, stir mechanically at 100 rpm for 2 hours, and fully dissolve The mixed solution of the mixed solution is cast into a film, and the lignin / polyvinyl alcohol composite material can be obtained after the water is naturally volatilized at room temperature. Wherein, the selected polyvinyl alcohol Mw=30000g / mol, and the degree of hydrolysis is 99%. The selected lignin is lignosulfonic acid, a by-product of sulfite pulping.

Embodiment 3

[0034] Parts by mass, g / mL, take 4.90 parts by mass of polyvinyl alcohol and 0.10 parts by mass of lignin, 0.5 parts by mass of 1-(3-aminopropyl) imidazole, add 100 parts by volume of water; under the condition of heating temperature 70°C, 300rpm After mechanical stirring for 5 hours, the fully dissolved mixed solution was cast into a film, and the lignin / polyvinyl alcohol composite material was obtained after the water was naturally volatilized at room temperature. Wherein, the selected polyvinyl alcohol Mw=89000g / mol, the degree of hydrolysis is 99%. The selected lignin is lignosulfonic acid, a by-product of sulfite pulping.

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Abstract

The invention belongs to the technical field of high molecular materials, and discloses a lignin / polyvinyl alcohol composite material and a preparation method thereof. The composite material comprisesthe following components by mass percentage: 70-99.4% of polyvinyl alcohol, 0.5-30% of lignin and 0.1-10% of additive, wherein the additive comprises at least one of 3-amino-1,2,4 triazole, 4-aminopyridine, 1-(3-aminopropyl) imidazole, 4-(2-ethylamino) benzene-1,2-diphenol, 2-amino-3-imidazolylpropionic acid, tannic acid, 3,3,3',3'-tetramethyl-1,1-helix biindolyl-5,5',6,6'-tetraol, zinc chloride,zinc acetate, ferric chloride, calcium chloride, copper chloride, iron oxide, and sodium chloride. The present invention also provides a composite material preparation method. The tensile strength ofthe lignin / polyvinyl alcohol composite material can reach up to 140 MPa, and the elongation at break of the lignin / polyvinyl alcohol composite material can reach up to 800%.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a lignin / polyvinyl alcohol composite material and a preparation method thereof. Background technique [0002] Polyvinyl alcohol (PVA) is a kind of water-soluble polymer, which has excellent mechanical properties, good transparency, high oxygen barrier properties, biodegradability and other advantages, and is widely used in various product packaging [Polym.Int2009; 58 :97–104.]. At the same time, polyvinyl alcohol has no toxic and side effects on the human body and is a good biomedical material. The main chain of polyvinyl alcohol contains a large number of hydroxyl groups, a large number of hydrogen bonds are formed between molecules and intramolecules, there are many physical cross-linking points, and the density is high, resulting in the melting temperature of polyvinyl alcohol (200 ℃ ~ 250 ℃) is very close to the decomposition temperature, so it cannot b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L97/00C08J5/18
CPCC08J5/18C08J2329/04C08J2497/00
Inventor 刘伟峰邱学青张晓黄锦浩杨东杰楼宏铭
Owner SOUTH CHINA UNIV OF TECH
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