Method for bamboo liquifying substance phenolic glue

A production method, phenolic adhesive technology, applied in adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve problems such as long growth cycle, high requirements for liquefaction conditions, and difficult decomposition

Inactive Publication Date: 2007-01-24
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In a word, the existing technology uses wood as the main raw material to make glue. Due to the long growth cycle of wood, the raw material is increasingly in short supply, the wood fiber has a high degree of polymerization and is difficult to decompose, and the requirements for liquefaction are relatively high. Wood does not contain or rarely contains wax. It lacks the advantage that melting wax will improve the fluidity of liquefied liquid, and it is basically impossible to have the advantage of melting wax and phenolic substances to generate alkylphenols to improve the plasticity of liquefied liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Pour 200 parts by weight of phenol into the reaction kettle and stir, raise the temperature to 120°C, add 15 parts by weight of concentrated hydrochloric acid, and then add 150 parts by weight of bamboo powder with a particle size of 200 meshes, stir well, and keep warm for 1.5 hours to form bamboo phenol liquefaction. When it is cooled to 50°C, add NaoH to adjust the pH to 9, and add water and formaldehyde to the reactor in a weight ratio of bamboo phenol liquefaction: water: formaldehyde = 1: 1: 1, and keep it warm for 1 hour. Raise the temperature to 90°C and react for another 1 hour. After the reaction is complete, cool and discharge.

Embodiment 2

[0014] Pour 150 parts by weight of cresol into the reaction kettle, stir, heat up to 90°C, add 20 parts by weight of concentrated sulfuric acid, then add 100 parts by weight of 200-mesh bamboo powder, stir fully, keep warm for 20 minutes, and then add 50 parts by weight of bamboo powder , Stir, heat preservation reaction 2h Serve bamboo phenol liquefaction. The subsequent gel forming steps are the same as in Example 1, the catalyst is changed to KOH, and furfural is added in two times.

Embodiment 3

[0016] Pour 200 parts by weight of xylenol into the reaction kettle, stir, heat up to 140°C, add 20 parts by weight of phosphoric acid, then add 50 parts by weight of 200-mesh bamboo powder, fully stir, keep warm for 15 minutes, and then add 50 parts by weight of bamboo powder , fully stirred, and heat-preserved for 15 minutes, adding 50 parts by weight of bamboo powder for the third time, fully stirred and then heat-preserved for 2.5 hours. Subsequent gelation steps are the same as in Example 1, and the catalyst is changed to Ba(OH) 2 Acetaldehyde was added in two portions.

[0017] Above-mentioned three embodiments are preferred with embodiment 1. After the total reaction time of the three examples was completed, the viscosity of the phenolic adhesives all reached the set requirements.

[0018] The selected acidic catalysts, basic catalysts, phenols and aldehydes are mainly selected in consideration of raw material cost, source, reaction speed, quality and use of liquefied...

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Abstract

The bamboo liquefying phenolic glue is prepared through heating phenol compound in 50-200 weight portions to 90-140 deg.c inside a reactor; adding acid catalyst in 10 -20 weight portions and bamboo powder in 50-150 weight portions through stirring to react to obtain liquid matter; cooling to 55 deg.c, regulating pH value with alkali to 8-12, adding water and aldehyde to react for 1 hr, heating to 80-100 deg.c and reacting for 1 hr; cooling and discharging. The bamboo liquefying phenolic glue is used as adhesive for bamboo and wood product. The present invention has low cost, and the produced bamboo liquefying phenolic glue has high plasticity.

Description

technical field [0001] The invention relates to a method for producing liquefied products by reacting with phenols under acidic conditions after bamboo is crushed, and then carrying out addition polycondensation reaction with aldehydes under alkaline conditions to generate phenolic glue. Background technique [0002] In the late last century, Japan and other countries began to study wood liquefaction. Wood was heated and reacted with an acidic catalyst in phenol or polyol organic solvent to produce wood liquefaction and then made into glue. [0003] CN1554724A discloses the patent technology of "preparation method of liquefied wood phenolic adhesive" of the Institute of Wood Industry of the Chinese Academy of Forestry, adding polar small molecules as solvents, and reacting with wood flour under acidic catalyst conditions in the form of mixed solvents with phenol , After the wood liquefaction is obtained, the liquefied wood phenolic adhesive is produced in basically the same ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C09J161/00
Inventor 傅深渊刘力程书娜
Owner ZHEJIANG FORESTRY UNIVERSITY
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