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Preparation method of recombined wood

A technology for recombining wood and wood veneer, which is applied in wood treatment, impregnating wood, manufacturing tools, etc. It can solve the problems of poor waterproof performance and low bond strength, and achieve the effect of improving bond strength

Inactive Publication Date: 2019-05-21
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing recombined wood has problems such as low bond strength and poor waterproof performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] The invention provides a method for preparing recombined wood, comprising the following steps:

[0030] a) The methyl silicate modified phenolic resin glue is impregnated in the wood veneer, and dried to obtain a sizing veneer;

[0031] B) impregnating the unmodified phenolic resin glue into the described primary sizing veneer, drying to obtain the secondary sizing veneer;

[0032] c) Molding the secondary sized veneer to obtain recombined wood.

[0033] In the present invention, the methyl silicate modified phenolic resin glue is first impregnated into the wood veneer. Wherein, the thickness of the wood veneer is preferably 0.5-2mm, specifically 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm. In the present invention, before impregnating, the wood veneer is preferably first subjected to alkali treatment, and the specific treatment steps include:

[0034] The wood veneer is alkali-cooked in an alkaline co...

Embodiment 1

[0051] The preparation technology of silicon-modified phenolic resin glue is: 100 parts of phenol, 140 parts of 36.7wt% formaldehyde aqueous solution, 6 parts of 32wt% sodium hydroxide aqueous solution, 30 parts of water, in the 500ml four parts that spherical condenser, thermometer and stirring device are housed Add metered phenol and sodium hydroxide aqueous solution into the flask, stir at 40°C for 40 minutes, then add formaldehyde solution dropwise, raise the temperature to 50°C and stir for 100 minutes, continue to raise the temperature to 70°C and stir for 100 minutes, and finally raise the temperature to 80°C Stir at constant temperature for 60 minutes, add water and 2 parts of sodium methyl silicate, and cool to room temperature to obtain silicon-modified phenolic resin glue; the viscosity of silicon-modified phenolic resin glue is 1cps (25°C), and the content of free formaldehyde is 0.25wt%. The content of phenol is 2.5wt%.

[0052] The preparation process of phenolic...

Embodiment 2

[0055] The preparation technology of silicon-modified phenolic resin glue is: 100 parts of phenol, 150 parts of 36.7wt% formaldehyde aqueous solution, 18 parts of 32wt% sodium hydroxide aqueous solution, 30 parts of water, in the 500ml four parts that spherical condenser, thermometer and stirring device are housed Add metered phenol and sodium hydroxide aqueous solution to the flask, stir at 40°C for 60 minutes, then add formaldehyde solution dropwise, raise the temperature to 50°C and stir for 140 minutes, continue to heat up to 70°C and stir for 150 minutes, and finally raise the temperature to 80°C Stir at constant temperature for 120 minutes, add water, 5 parts of sodium methyl silicate, and 5 parts of potassium methyl silicate, and cool to room temperature to obtain silicon-modified phenolic resin glue; the viscosity of silicon-modified phenolic resin glue is 12cps (25°C), free The content of formaldehyde is 0.12wt%, and the content of free phenol is 1.2wt%.

[0056] The ...

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Abstract

The invention belongs to the field of recombined wood and particularly relates to a preparation method of recombined wood. The provided preparation method comprises the following steps of a, soaking wood veneers into methyl-silicate-modified phenolic resin glue and drying the wood veneers to obtain primary sizing veneers; b, soaking the primary sizing veneers into unmodified phenolic resin glue and drying the veneers to obtain secondary sizing veneers; c, carrying out die pressing on the secondary sizing veneers to obtain the recombined wood. According to the method, different kinds of phenolic resin glue are adopted for carrying out two-step glue dipping on the wood veneers, so that the bonding strength of the recombined wood obtained by subsequent die pressing is greatly improved, and the saturated water absorption rate of the recombined wood is reduced. It is indicated by experimental results that the bonding strength of the recombinant wood prepared by the method can reach 2.2-4.0MPa, and the saturated water absorption rate is 15-17.5%.

Description

technical field [0001] The invention belongs to the field of recombined wood, in particular to a preparation method of recombined wood. Background technique [0002] my country is a country in short supply of forest resources, forest resources are very precious, and there is a big contradiction between timber supply and demand. According to customs statistics, in the first quarter of 2016, my country imported a total of 11 million cubic meters of logs. In the case of a serious shortage of forest resources in my country, after the full implementation of the natural forest resources protection project in China, the timber supply structure has undergone fundamental changes, using fast-growing timber, low-quality timber, small-diameter timber, thinning timber and non-wood plant fibers as raw materials It is the trend of the times to replace traditional large-diameter wood resources with high-quality recombined wood. [0003] Recombined wood is a kind of artificial wood with hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/20B27K3/36B27K5/04B27N7/00C08G8/10
Inventor 张蒙马韵升李双昌马凤国冯冶柳金章刘振学
Owner CHAMBROAD CHEM IND RES INST CO LTD
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