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Modified phenolic resin adhesive and preparation method and application thereof and preparation method of bamboo-wood composite board

A technology of phenolic resin glue and modifier, which is applied in the jointing and application of wooden veneers, and other household appliances. It can solve the problems of insufficient glue absorption, increased energy consumption, and long baking time to achieve free phenol Low content, avoid release effect

Active Publication Date: 2018-07-13
FUJIAN HEQIZU FORESTRY SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The moisture content of the dried board is clearly limited, and the moisture content of the dried bamboo board is required to be lower than 6%. If the board with a moisture content that does not meet the requirements is directly used for dipping, it will affect the smooth progress of the dipping. Insufficient glue absorption during the dipping process
In order to increase the amount of glue absorbed, the dipping time will be extended, which will lead to the absorption of more water during the dipping process, and the drying time after dipping will also be extended accordingly. The requireme

Method used

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  • Modified phenolic resin adhesive and preparation method and application thereof and preparation method of bamboo-wood composite board

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preparation example Construction

[0031] The invention provides a kind of preparation method of modified phenolic resin adhesive, comprises the following steps:

[0032] (1) Adding phenol, formaldehyde and tea polyphenols to obtain an addition product; the temperature of the addition reaction is 90-95° C., and the time of the addition reaction is 1-2 hours;

[0033] (2) performing a modification reaction on the addition product obtained in the step (1), the first modifier and the second modifier, to obtain a modified phenolic resin adhesive;

[0034] The temperature of the modification reaction is 60-80°C, and the time of the modification reaction is 1-1.5h;

[0035] The first modifier is resorcinol; the second modifier includes propylene carbonate, epoxy resin or silicone resin.

[0036] In the invention, the addition reaction is carried out on phenol, formaldehyde and tea polyphenol to obtain the addition product. In the present invention, the molar ratio of the phenol to formaldehyde is preferably 1:1.8-2...

Embodiment 1

[0075] (1) Ultrasonic-assisted extraction of tea polyphenols solution: prepare an ethanol solution with a mass fraction of 60%, add tea stalk powder in a proportion of 10% of the total mass of the ethanol solution, limit the ultrasonic frequency to 20KHz, and extract at a temperature of 60°C. The time is 20 minutes.

[0076] (2) Preparation of modified phenolic resin adhesive: Weigh phenol and formaldehyde according to the molar ratio of 1:2, the mass of tea polyphenols in the tea stem extract is 10% of the mass of phenol, resorcinol modifier The quality of propylene carbonate is 15% of the phenol mass, and the quality of propylene carbonate is 6% of the phenol mass.

[0077] Addition reaction of phenol, formaldehyde and tea polyphenols at 90°C for 60 minutes, after the reaction is completed, cool to 70°C, add resorcinol and propylene carbonate, react for 1 hour, and obtain a modified phenolic resin adhesive.

[0078] The main performance test results of the obtained modified...

Embodiment 2

[0084] (1) Ultrasonic-assisted extraction of tea polyphenols solution: prepare an ethanol solution with a mass fraction of 70%, add tea stem powder in a proportion of 20% of the total mass of the ethanol solution, limit the ultrasonic frequency to 20KHz, and extract at a temperature of 70°C. The time is 30 minutes.

[0085] (2) Preparation of modified phenolic resin adhesive: Weigh phenol and formaldehyde according to the molar ratio of 1:2, the mass of tea polyphenols in the tea stalk extract is 30% of the mass of phenol, resorcinol modifier The quality of propylene carbonate is 10% of the phenol mass, and the quality of propylene carbonate is 4% of the phenol mass.

[0086] Addition reaction of phenol, formaldehyde and tea polyphenols at 95°C for 70 minutes, after the reaction was completed, cooled to 65°C, added resorcinol and propylene carbonate, reacted for 1 hour to obtain a modified phenolic resin adhesive.

[0087] The main performance test results of the obtained mod...

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Abstract

The invention provides a modified phenolic resin adhesive and a preparation method thereof. Tea polyphenol is used for replacing part of phenol; and through combination of the effects of two modifyingagents, the obtained phenolic resin adhesive is high in viscosity, so that quick impregnation of bamboos can be realized, high gluing strength is achieved, firm bonding between bamboo boards and woodboards can be realized, the glue sucking quantity is increased without prolonging the impregnation time, and reduction of the energy consumption is facilitated. Results of the embodiment show that when the modified phenolic resin adhesive is adopted to prepare bamboo-wood composite boards, the water content of the bamboos is only controlled within the range from 25% to 45% without enabling the bamboo water content to be below 6%, so that the composite boards meeting corresponding performance requirements can be obtained. The invention further provides a preparation method of the bamboo-wood composite boards; and the modified phenolic resin adhesive is used as impregnation liquid, and a centrifugal impregnation mode is adopted to dehydrate the bamboos during impregnating, so that impregnation can be realized in a high-moisture state, and the bamboo drying energy consumption is saved.

Description

technical field [0001] The invention belongs to the technical field of composite board preparation, and in particular relates to a modified phenolic resin adhesive, a preparation method and application thereof, and a preparation method of a bamboo-wood composite board. Background technique [0002] Container is the general term for the group of tools for transporting packaged or unpackaged goods. The container floor is an important part and main load-bearing accessory of the container, which affects the transportation safety and quality of the goods. The traditional container floor is mainly made of wooden plywood made of tropical hard hardwood. Due to the reduction of hard broad-leaved timber resources in the world and the implementation of natural forest protection measures, countries around the world are gradually adopting alternative materials to reduce the use of tropical broad-leaved timber. The bamboo-wood container floor adopts the production method of bamboo-wood c...

Claims

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Application Information

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IPC IPC(8): B27D1/04B27D1/08B27K3/04B27K3/36B27K5/04B27K9/00
CPCB27D1/04B27D1/08B27K3/04B27K3/36B27K5/04B27K9/002B27N3/02
Inventor 侯伦灯俞艳吴黄贵郑忠福郑志伟
Owner FUJIAN HEQIZU FORESTRY SCI & TECH CO LTD
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