Bio-based adhesive and preparation method thereof

An adhesive and base glue technology, applied in the field of polymer chemistry, can solve problems such as polluting the environment and endangering human health, and achieve the effects of overcoming adhesion performance, improving adhesion performance, and high adhesion

Inactive Publication Date: 2017-11-24
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional synthetic adhesives are easily soluble in organic solvents during use, and their molecular chains will undergo dynamic depolymerization equilibrium, releasing harmful synthetic monomers such as formaldehyde, polluting the environment, and endangering human health.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0032] The preparation method of bio-based adhesive of the present invention mainly comprises the following steps:

[0033] (1) Mix lignosulfonate, tea polyphenols, defatted starch and NaOH in a certain proportion, and the ratio of mass parts is: starch: 30-100 parts; lignosulfonate: 5-10 parts; tea Polyphenol: 1~5 parts; NaOH: 0.5~5 parts; Initiator: 0.5~2 parts;

[0034] After mixing and dissolving in a certain amount of aqueous solution, add an appropriate amount of initiator to the mixed solution, and control different stirring temperatures and stirring speeds. The mixing reaction temperature of starch, lignosulfonate and tea polyphenols is 30-80°C, and the reaction time is 4h~24h; the stirring rate is 200r / min~400r / min, so that the glycosidic bonds in the starch molecular chains are broken under the conditions of stirring temperature and stirring speed, forming double bonds, and freeing the double bonds in lignin radical reaction to bond lignin into the starch matrix. I...

Embodiment 1

[0042] (1) After dissolving 5g of guaiacol-based lignosulfonate, 1g of tea polyphenols, 30g of defatted soybean starch and 0.5g of NaOH in 100mL of aqueous solution, add 0.5g of initiator ammonium persulfate to the mixed solution, Control the stirring temperature to 30°C and the stirring rate to 200r / min. After reacting for 4 hours, stop the reaction to obtain the main ingredient of the starch-based adhesive.

[0043] (2) After mixing 20g of isophorone diisocyanate and 18g of sodium bisulfite at 25°C, add it to the main ingredient of the starch-based adhesive prepared in step (1), and prepare it evenly to obtain a starch-based adhesive agent.

Embodiment 2

[0045] (1) Dissolve 10g of syringyl lignosulfonate, 5g of tea polyphenols, 100g of defatted cornstarch and 5g of NaOH in 500mL of aqueous solution, add 2g of initiator sodium thiosulfate to the mixed solution, and control the stirring temperature 80°C, stirring rate 400r / min, after 24 hours of reaction, stop the reaction to obtain the main ingredient of starch-based adhesive.

[0046] (2) After mixing 50 g of toluene diisocyanate and 50 g of sodium bisulfite at 25°C, add it to the main ingredient of the starch-based adhesive prepared in step (1), and prepare it evenly to obtain a starch-based adhesive.

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PUM

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Abstract

The invention provides a bio-based adhesive and a preparation method thereof and belongs to the technical field of high-molecular chemistry. The bio-based adhesive contains the following main components in parts by weight: bio-based starch, lignin, tea polyphenol and isocyanate. The bio-based adhesive and the preparation method provided by the invention have the advantages that the traditional preparation method for the adhesives is changed, and under the condition without adding any organic solvent and aldehyde-containing monomer, the bio-based adhesive with higher adhesiveness and heat stability is prepared by adopting natural biomass starch as a main agent, the lignin and the tea polyphenol as additives, the isocyanate as a crosslinking agent and water as a green solvent as well as a series of environment-friendly paths.

Description

technical field [0001] The invention relates to the technical field of polymer chemistry, in particular to a bio-based adhesive and a preparation method thereof. Background technique [0002] Adhesive is a polymer material that can connect two or more homogeneous or heterogeneous materials through interfacial adhesion and cohesion. It has excellent interface wetting and adhesion properties, and continuous stress release. , light weight, low sealing process temperature and other advantages, it has been widely used in various fields of the national economy such as construction, packaging, electronics, medical care and textiles. According to different sources, it can be divided into natural adhesives and synthetic adhesives. Among them, the preparation method of natural adhesives is simple, cheap, fast in bonding speed, easy to degrade, and most of them are water-soluble, low-toxic or even non-toxic. However, its structure is single, its cohesive force is low, and the source ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J11/06C08G18/80C08G18/64C08F299/00
CPCC08F299/00C08G18/64C08G18/8054C08K5/1545C09J11/06C09J175/04
Inventor 夏南南孔凡功王守娟吴芹许仃仃
Owner QILU UNIV OF TECH
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