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Carbohydrate derived adhesive as well as preparation method and application thereof

A technology of carbohydrates and adhesives, applied in chemical instruments and methods, aldehyde/ketone condensation polymer adhesives, adhesives, etc., can solve the problems of different chemical structures, unstable performance of derived adhesives, low reactivity, etc. problems, to achieve the effect of enhancing glueing, overcoming large differences in raw material structure and properties, and low dependence on fossil resources

Active Publication Date: 2022-04-08
SHANDONG BAIWO BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low reactivity of biomass macromolecules such as lignin and plant protein in the prior art, different chemical structures of macromolecules from different sources, and unstable performance of adhesives derived from raw materials from different sources. Method for preparing adhesive directly from carbohydrates in biomass such as wood and straw

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Adhesive preparation:

[0033] First, add 8 g of glucose, 8 g of deionized water, 24 g of lithium bromide, 60 g of acetone, and 0.44 mL of hydrochloric acid with a mass content of 37% into a 350 mL thick-walled pressure bottle. After tightening the cap of the thick-walled pressure bottle, The thick-walled pressure-resistant bottle was fixed in an oil bath at 120 °C for 1 h. After the reaction was completed, the solid-liquid mixture produced by the rotary steaming reaction was used to reclaim the unreacted acetone; the residue produced by the rotary steaming was extracted with dichloromethane, centrifuged, and the dichloromethane phase, the water phase and the solid matter were collected; Dichloromethane in the dichloromethane phase was evaporated to obtain a furan-based adhesive.

[0034] Adhesive curing:

[0035] Add phosphoric acid, acetone, diphenylmethane diisocyanate and furan-based adhesive into the three-necked flask. Based on the quality of the furan-based ad...

Embodiment 2

[0042] Except that the added 8 g of glucose was replaced by 8 g of eucalyptus wood powder and the volume of 37% hydrochloric acid added in the adhesive preparation process was 0.88 mL, the particle size of the wood powder was 40-80 mesh, and other steps were the same as Example 1 is the same.

[0043] It has been determined that the bonding strength of the three-layer plywood is 0.85 Mpa.

Embodiment 3

[0045] Except that the added 8 g of glucose was replaced by 8 g of masson pine wood powder and the volume of 37% hydrochloric acid added in the adhesive preparation process was 0.88 mL, the particle size of the wood powder was 40-80 mesh, other steps and examples 1 is the same.

[0046] It has been determined that the bonding strength of the three-layer plywood is 0.83 Mpa.

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PUM

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Abstract

The invention discloses a preparation method of a carbohydrate derivative adhesive, which comprises the following steps: (1) preparing an adhesive: adding acetone, water, a catalyst and a carbohydrate-containing raw material into a reaction kettle for reaction, after the reaction is completed, distilling to remove acetone in the mixture to obtain a solid residue, and then extracting the solid residue by using an organic solvent to obtain the carbohydrate derivative adhesive; and separating the extract liquor, and removing the organic solvent in the extract liquor to obtain the adhesive. And (2) curing the adhesive: mixing the adhesive, a curing agent, a solvent and an auxiliary agent to obtain the formaldehyde-free bio-based adhesive which can be directly applied to hot-pressing curing, namely the carbohydrate derived adhesive. According to the invention, the defects of large difference of raw material structures and properties, unstable adhesive performance and the like in the traditional method can be overcome, and the green biomass-based formaldehyde-free adhesive with stable performance and low dependency on fossil resources can be prepared.

Description

Background technique [0001] Adhesives are important intermediate raw materials for the preparation of wood-based panels and other wood products. With the increase in the demand and quality of wood products in human society, the demand for high-quality adhesives in the wood industry continues to increase. At present, the adhesives used in the wood industry are mainly formaldehyde-based adhesives such as urea-formaldehyde resins, phenolic resins, and melamine-formaldehyde resins. Formaldehyde-based adhesives have been widely used in the wood industry because of their strong bonding properties, water resistance, and heat resistance. However, formaldehyde-based adhesives not only involve the disadvantages of high internal stress in the adhesive layer and easy cracking of the surface, but also the raw materials required for the preparation of such adhesives are highly dependent on fossil resources. With the rapid consumption of fossil resources, the supply of raw materials for for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/00C09J11/06C08G16/00B32B7/12B32B21/13B32B37/06B32B37/10B32B37/12
Inventor 罗小林孙文昌帅李
Owner SHANDONG BAIWO BIOTECHNOLOGY CO LTD
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