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Oxidized starch modified phenolic resin lumber adhesion agent, preparation method and application thereof

A wood adhesive, phenolic resin technology, applied in starch-derived adhesives, adhesives, aldehyde/ketone condensation polymer adhesives and other directions, can solve the problems of lack of environmental protection resources for synthetic resin adhesives, etc. Energy, low cost effect

Inactive Publication Date: 2008-07-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the present invention, starch, a clean and renewable resource, is used in the production of wood adhesives, which solves the problems of environmental protection and resource scarcity faced by synthetic resin adhesives

Method used

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  • Oxidized starch modified phenolic resin lumber adhesion agent, preparation method and application thereof
  • Oxidized starch modified phenolic resin lumber adhesion agent, preparation method and application thereof
  • Oxidized starch modified phenolic resin lumber adhesion agent, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] As shown in Figure 1, the preparation method of utilizing oxidized starch to modify phenolic resin wood adhesive comprises the following steps:

[0031] (1) Synthesis of phenolic resin oligomers. In a three-necked flask equipped with an electric stirrer, a thermometer, and a reflux condenser (a dripping funnel is attached to the top), a molten phenol (37%) and a formaldehyde solution with a molar ratio of 1:2.4 were placed in a constant temperature water bath. While stirring, add 50% sodium hydroxide solution from the dropping funnel to make the pH value 9.5, then heat up to 75°C, keep the temperature for 60 minutes to carry out the addition reaction of formaldehyde and phenol, then heat up to 95°C, and keep the temperature constant for 30 minutes while stirring. , to further condense polymethylol phenol into phenolic resin oligomers. After the reaction is completed, the temperature is lowered to 40 °C for discharging; the water, free phenol and free aldehyde are disti...

Embodiment 2

[0051] Utilize the preparation method of oxidized starch modified phenolic resin wood adhesive, comprising the following steps:

[0052] (1) Synthesis of phenolic resin oligomers. In a three-necked flask equipped with an electric stirrer, a thermometer, and a reflux condenser (a dropping funnel is attached to the top), put the molten phenol (37%) and formaldehyde solution with a molar ratio of 1:2.6 and place them in a constant temperature water bath. While stirring, add 50% sodium hydroxide solution from the dropping funnel to make the pH value at 11, then heat up to 80 °C, keep the temperature for 40 minutes to carry out the addition reaction of formaldehyde and phenol, then heat up to 90 °C, and keep the temperature constant for 40 minutes while stirring. , to further condense polymethylol phenol into phenolic resin oligomers. After the completion of the reaction, the temperature was lowered to 40 °C and the material was discharged. Then, a rotary evaporator was used to d...

Embodiment 3

[0059] Utilize the preparation method of oxidized starch modified phenolic resin wood adhesive, comprising the following steps:

[0060] (1) Synthesis of phenolic resin oligomers. In a three-necked flask equipped with an electric stirrer, a thermometer, and a reflux condenser (a dropping funnel is attached to the top), put the molten phenol (37%) and formaldehyde solution with a molar ratio of 1:1.4 and place them in a constant temperature water bath. While stirring, add 50% sodium hydroxide solution from the dropping funnel to make the pH value 9, then heat up to 60 °C, keep the temperature for 60 minutes to carry out the addition reaction of formaldehyde and phenol, then heat up to 100 °C, and keep the temperature constant for 20 minutes while stirring. , to further condense polymethylol phenol into phenolic resin oligomers. After the completion of the reaction, the temperature was lowered to 40 °C and the material was discharged. Then use a rotary evaporator to distill ou...

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Abstract

The invention discloses an oxidized starch modified phenol-formaldehyde resin wood adhesive and a preparation method, wherein, the wood adhesive is prepared by firstly compounding molten phenol and formaldehyde into a thermosetting phenolic resin low polymer, then enzymolysis is added into the oxidized starch to obtain oxidized starch substrate, and then a novel environmental protection wood adhesive is attained by modifying the phenolic resin with the obtained oxidized starch substrate. The invention also discloses an application of the wood adhesive in the wood industry. The invention has the advantages that efficiency is improved and energy is saved by hydrolyzing the oxidized starch with heat resistant-Alpha amylase and by modifying the phenolic resin wood adhesive with the oxidized starch substrate.

Description

technical field [0001] The invention relates to a technology for producing wood adhesive, in particular to a method for preparing wood adhesive by using oxidized starch modified phenolic resin. Background technique [0002] The wood industry plays an important role in the economy of many countries. The annual consumption of wood in my country reaches 21.5 billion m 3 , equivalent to 11.5 billion t, equivalent to the sum of the annual consumption of steel and plastics in my country. Due to the lack of forest resources and few large-diameter trees, the wood industry can only use small-diameter wood to glue or manufacture wood-based panels to meet the needs of industrial and agricultural production and people's lives. In this way, the wood industry uses glue The amount increased even more. [0003] Generally speaking, the amount of glue used in the general wood industry is: production of 10 000m 3 Plywood needs adhesive 6t; production 10 000m 3 Particleboard requires 1200t ...

Claims

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Application Information

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IPC IPC(8): C09J161/14C09J103/10B27D1/04
Inventor 李琳谭惠凤李冰陈玲张喜梅李晓玺盖作启
Owner SOUTH CHINA UNIV OF TECH
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