Treatment method for adjusting color difference of wood veneer

A technology of wood veneer and treatment method, which is applied in the direction of wood treatment, wood treatment details, wood impregnation, etc., can solve the problems of deepening the color of wood veneer, veneer color difference, large surface corrosion, high processing cost, etc. The effect of chromatic aberration, improving whiteness, and mitigating corrosion conditions

Active Publication Date: 2021-09-03
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of chromophoric groups (such as carbonyl, carboxyl and alkene conjugated to benzene rings) and auxochromic groups (such as phenolic hydroxyl and alcoholic hydroxyl) in the lignin structure, it is inevitable to cause the excessive color of wood veneer. In addition, in the actual production process, improper log storage and mechanical processing have further deepened the color of the wood veneer and the color difference of the veneer, seriously affecting the utilization of raw materials and the quality of the product. quality
[0003] For the above-mentioned problems, in the prior art, high-concentration hydrogen peroxide, common decolorizers and other reagents that corrode the wood surface more seriously are often used to bleach the veneer, but these methods only affect the blackening of the wood caused by the erosion of color-changing bacteria. The color change of the material has an effect, and the higher concentration of hydrogen peroxide has a greater corrosion on the surface of the wood board, while organic reagents such as ethylene oxide will cause greater pollution to the environment, and the treatment cost is high

Method used

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  • Treatment method for adjusting color difference of wood veneer
  • Treatment method for adjusting color difference of wood veneer
  • Treatment method for adjusting color difference of wood veneer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Wood has a natural tone, and lignin is one of the main reasons why wood has different colors. There are chromophoric groups (such as carbonyl, carboxyl and alkene conjugated to benzene ring) and auxochromic groups (such as phenolic hydroxyl and alcoholic hydroxyl) in the lignin structure. In this embodiment, for the condition of darker wood color, the secondary toning method is adopted. Specifically, poplar veneer is selected as the experimental object for processing, including a total of 4 veneers, which are respectively marked as A, B, C, and D. The specific process flow diagram is attached figure 1 shown.

[0040] S1: configure buffer solution;

[0041] Sodium carbonate and sodium bicarbonate are added to water to obtain a buffer solution I, wherein the mass fraction of the sodium carbonate is 2 to 5%, and the mass fraction of the sodium bicarbonate is 1 to 5%;

[0042] adding glacial acetic acid and sodium acetate to water to obtain buffer solution II, wherein th...

Embodiment 2

[0058] In this embodiment, the poplar veneer is treated, including 4 veneers, which are respectively marked as A, B, C, and D. The specific method is as follows. figure 2 shown.

[0059] S1: prepare buffer solution;

[0060] adding glacial acetic acid and sodium acetate into water to obtain a buffer solution, wherein the mass fraction of the glacial acetic acid is 5-10%, and the mass fraction of the sodium acetate is 2-5%;

[0061] S2: toning;

[0062] The first stage: take the buffer solution, place the wood veneer in the buffer solution, add the toner, heat to 60-80°C, control the pH value of the solution to 4, and treat for 60 minutes;

[0063] The second stage: adjust the pH value of the solution to 6, and treat for 60 minutes.

[0064] S3: post-processing;

[0065] Take out the wood veneer after toning, wash it in water, and dry it for use;

[0066] Wherein, the toner is a sodium chlorite solution with a mass fraction of 2.0%, and the mass ratio of the buffer soluti...

Embodiment 3

[0069] In this embodiment, bamboo and wood veneers are treated, including 4 veneers, which are respectively marked as A, B, C, and D. The specific method is the same as in Example 2. The whiteness comparison diagram of bamboo and wood veneers before and after treatment is as attached image 3 Shown below.

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Abstract

The invention provides a treatment method for adjusting color difference of a wood veneer. The method comprises the steps of buffer solution preparation, color matching, post-treatment and the like, wherein a toner is a sodium chlorite solution with the mass fraction of 1.0-3.0%, the mass ratio of the buffer solution to the toner is (5-15): 1, and in the color matching process, the pH value of the solution is controlled to be 4-6. According to the method for toning the wood veneer by using the toner with the chlorous acid as the main component in the acidic buffer solution, chromophoric groups and auxochrome groups of lignin can be effectively destroyed, and compared with a traditional method for bleaching wood by using high-concentration hydrogen peroxide, the corrosion condition of the surface of the toner wood veneer can be better retarded, the whiteness of the wood veneer is improved and the color difference of the veneer is reduced while the original texture of the wood is not influenced.

Description

technical field [0001] The invention relates to the technical field of wood treatment, in particular to a treatment method for adjusting color difference of wood veneers. Background technique [0002] At present, the logs used for decorative materials are mainly artificial fast-growing materials, mainly Ayous, poplar, basswood, etc., and the lignin structure widely exists in the wood. Due to the existence of chromophoric groups (such as carbonyl, carboxyl and alkene conjugated to benzene rings) and auxochromic groups (such as phenolic hydroxyl and alcoholic hydroxyl) in the lignin structure, it is inevitable to cause the excessive color of wood veneer. In addition, in the actual production process, improper log storage and mechanical processing have further deepened the color of the wood veneer and the color difference of the veneer, seriously affecting the utilization of raw materials and the quality of the product. quality. [0003] For the above-mentioned problems, in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/50B27K5/02B27K5/04
CPCB27K3/50B27K5/02B27K5/04
Inventor 张晓春马妞妞尤龙尨
Owner ZHEJIANG FORESTRY UNIVERSITY
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