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

A technology of wood adhesives and phenolic resins, applied in the direction of starch-derived adhesives, adhesives, aldehyde/ketone condensation polymer adhesives, etc., can solve the problems of lack of environmental protection resources for synthetic resin adhesives, and achieve poor water resistance and energy saving Energy and efficiency improvement effects

Inactive Publication Date: 2011-05-04
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, utilize the preparation method of oxidized starch modified phenolic resin wood adhesive, comprise the steps:

[0031] (1) Synthesis of phenolic resin oligomers. In a three-necked flask equipped with an electric stirrer, a thermometer, and a reflux condenser (dropping funnel), put molten phenol (37%) and formaldehyde solution with a molar ratio of 1: 2.4 and place them in a constant temperature water bath. Add 50% sodium hydroxide solution from the dropping funnel while stirring to make the pH value 9.5, then raise the temperature to 75°C, keep it warm for 60min to carry out the addition reaction of formaldehyde and phenol, then raise the temperature to 95°C, and keep the temperature for 30min while stirring , to further condense polymethylol phenol into phenolic resin oligomers. After the reaction is completed, cool down to 40°C and discharge; then use a rotary evaporator to distill water, free phenol, and free aldehyde to obtain a liquid with a v...

Embodiment 2

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

[0052] (1) Synthesis of phenolic resin oligomers. In a three-necked flask equipped with an electric stirrer, a thermometer, and a reflux condenser (dropping funnel), put molten phenol (37%) and formaldehyde solution with a molar ratio of 1: 2.6 and place it in a constant temperature water bath. Add 50% sodium hydroxide solution from the dropping funnel while stirring, so that the pH value is 11, then raise the temperature to 80°C, keep it warm for 40min to carry out the addition reaction of formaldehyde and phenol, then raise the temperature to 90°C, and keep the temperature for 40min while stirring , to further condense polymethylol phenol into phenolic resin oligomers. After the reaction was completed, the temperature was lowered to 40°C and the material was discharged. Then use a rotary evaporator to distill water, free phenol, and free aldehyde to obtain ...

Embodiment 3

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

[0060] (1) Synthesis of phenolic resin oligomers. In a three-necked flask equipped with an electric stirrer, a thermometer, and a reflux condenser (dropping funnel), put molten phenol (37%) and formaldehyde solution with a molar ratio of 1: 1.4 in a constant temperature water bath, and Add 50% sodium hydroxide solution from the dropping funnel while stirring to make the pH value 9, then raise the temperature to 60°C, keep it warm for 60min to carry out the addition reaction of formaldehyde and phenol, then raise the temperature to 100°C, and keep the temperature for 20min while stirring , to further condense polymethylol phenol into phenolic resin oligomers. After the reaction was completed, the temperature was lowered to 40°C and the material was discharged. Then use a rotary evaporator to distill water, free phenol, and free aldehyde to obtain a liquid with...

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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 wood adhesive and the preparation method thereof 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 adhesives, in particular to a method for preparing wood adhesives by modifying phenolic resin with oxidized starch. Background technique [0002] The timber industry plays an important role in the economy of many countries. The annual consumption of timber in our country reaches 21.5 billion m 3 , equivalent to 11.5 billion tons, equivalent to the sum of the annual consumption of steel and plastics in my country. Due to the lack of forest resources, there are few large-diameter trees, and the wood industry can only use small-diameter wood to glue or make wood-based panels to meet the needs of industry, agricultural production and people's lives. In this way, the wood industry uses glue. volume increased even more. [0003] Generally speaking, the amount of glue used in the general wood industry is: to produce 10 000m 3 Plywood requires 6t of adhesive; production takes 10 000m 3 Particleboard ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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