CN108943261B

CN108943261B - Method for regulating and controlling color of fast growing wood by impregnating rosewood drying waste liquid

Info

Publication number: CN108943261B
Application number: CN201810987597.1A
Authority: CN
Inventors: 刘炀; 陈瑶; 高建民; 张鹏; 卫燕霞
Original assignee: Beijing Forestry University
Current assignee: Beijing Forestry University
Priority date: 2018-08-28
Filing date: 2018-08-28
Publication date: 2020-10-09
Anticipated expiration: 2038-08-28
Also published as: CN108943261A

Abstract

A method for regulating and controlling color of fast growing wood by impregnating rosewood drying waste liquid. During the drying of wood, part of the extractives in the wood components are evaporated and discharged. Researches show that volatile matters of the redwood wood contain a large amount of pigment components, and can be used as natural wood dye. Colored waste liquid generated in the drying process of the redwood is used for impregnating the light-colored fast growing wood, and the uniform, durable and natural wood color is obtained by adjusting the impregnation conditions, mordant and the like. The fast growing wood processed by the method has bright and beautiful color, the red-green chromaticity index change value delta a is more than or equal to 8, the yellow-blue chromaticity index change value delta b is more than or equal to 4, the brightness value change is not obvious, delta L is +/-3, and the obtained wood has uniform and natural color. The technology has the outstanding advantages that the extract component of the wood is utilized, and the wood is natural, pollution-free, green and environment-friendly. The method solves the problem of utilization of the dried waste liquor of the redwood while improving the additional value of the fast growing wood, and accords with the new concept of current environmental protection.

Description

Method for regulating and controlling color of fast growing wood by impregnating rosewood drying waste liquid

Technical Field

The invention relates to a method for regulating and controlling the color of fast growing wood by impregnating rosewood drying waste liquid, belonging to the technical field of wood color modification.

Background

China is a big rosewood consuming country, has hundreds of years of history as a special furniture material, and in recent years, along with the temperature rise of Chinese traditional culture, rosewood, as a carrier of Chinese traditional furniture culture, receives more and more attention, and the consumption of rosewood resources is increased year by year.

In the wood processing production process, drying is an essential link, and has important significance for preventing wood deformation, improving wood corrosion resistance, prolonging service life and the like. Common wood drying methods include conventional drying, vacuum drying, dehumidification drying, superheated steam drying and the like, waste liquid is discharged in the drying process, and the liquid contains pigment of the redwood and has certain utilization potential.

Common fast growing woods in China include poplar, eucalyptus, pine, willow and the like, have the advantages of short growth period and high wood forming rate, and can relieve the current wood shortage situation in China. But the fast-growing wood has lighter color and luster, does not accord with the aesthetic orientation of market consumers, and the fast-growing wood is dipped by the dry waste liquid, so that the fast-growing poplar dalbergia odorifera can be endowed with gorgeous color, the color is uniform, more color-developing color-assisting groups are provided for the fast-growing wood, the utilization problem of low-quality fast-growing wood is solved to a certain extent, and the grade and the use value of wood products are improved.

Disclosure of Invention

The invention aims to provide a method for regulating and controlling the color of fast growing wood by impregnating rosewood drying waste liquid aiming at the defects of the prior art. The method has the advantages of simple operation, low cost, easy control, improved color of fast growing wood, and increased use value of fast growing wood. The technical scheme adopted by the invention is as follows: a method for regulating and controlling the color of fast growing wood by impregnating rosewood drying waste liquid comprises the following specific steps:

(1) taking a certain amount of dry waste liquid, adding a certain mass of mordant into the dry waste liquid, and uniformly mixing to prepare a solution.

(2) Selecting a fast-growing plate which is free of corrosion and discoloration and uniform in material quality, sawing the plate polished by the abrasive paper into a certain size, and placing the plate into a vacuum reaction kettle.

(3) And (3) injecting the solution in the step (1) into a reaction kettle, completely immersing the plate in the solution, and vacuumizing for 12-36 h.

(4) Taking out the impregnated fast growing wood, and performing conventional drying treatment.

In the step (1), the mordant can be one of alum, blue vitriol and copperas, and the concentration is 0.05 mol/L-0.2 mol/L.

In the step (2), the fast-growing board can be one of fast-growing poplar, fast-growing eucalyptus and fast-growing pine, and the initial water content of the board is 6.5-9%.

Compared with the prior art, the invention has the following advantages and effects:

1. after the modification treatment, the wood color of the fast growing wood is close to the color of the pterocarpus macrocarpus, the color difference value of the wood color after the three mordanting agents are used and the color of the pterocarpus macrocarpus is compared, the three are all less than 3, the human naked eyes can not distinguish obviously in the range, wherein the blue vitriol effect is optimal, the melanterite effect is the worst, and the red-green chromaticity index change value △ a of the fast growing wood is △ a after the three mordanting agents are treated^*Not less than 8, yellow-blue chromaticity index variation value △ b^*Not less than 4, unobvious change in lightness value, △ L^*±3。

2. In the whole modification process, the colored waste liquid in the drying process of the rosewood is utilized, the utilization problem of the dried product is solved, the maximum utilization of resources is realized, and the concept of green industry is well explained.

3. The pigment of the natural rosewood is utilized to realize the color modification of the fast growing wood, compared with other treatment means, the color is more natural and more friendly, and the requirements of market consumers are met.

4. The preparation method is derived in the wood drying process, is simple to operate, simple and convenient in process, low in cost, easy to control, and suitable for the environmental protection concept, has a certain popularization value, and has a certain practical significance for improving the utilization value of the fast-growing poplar.

Detailed Description

The present invention will be described in detail with reference to specific examples below:

example 1

(3) And (3) injecting the solution in the step (1) into a reaction kettle, completely immersing the plate with the solution, vacuumizing, and immersing for 36 hours.

In the step (1), the mordant is alum, and the concentration is 0.1 mol/L.

In the step (2), the fast-growing plate is fast-growing poplar, and the initial water content of the plate is 8%.

After modification, the red-green chromaticity index change value delta a of the fast-growing poplar is 8.5, the yellow-blue chromaticity index change value delta b of the fast-growing poplar is 4.8, the lightness value delta L of the fast-growing poplar is 1.5, and the value delta E of the fast-growing poplar is 2.4 compared with the red sandalwood (L of the normal wood color is 40.5, a of the fast-growing poplar is 14.2, and b of the fast-growing poplar is 16.6).

Example 2

(3) And (3) injecting the solution in the step (1) into a reaction kettle, completely immersing the plate with the solution, and vacuumizing for 24 hours.

In the step (1), the mordant is blue vitriol, and the concentration is 0.15 mol/L.

In the step (2), the fast-growing plate is fast-growing eucalyptus and the like, and the initial water content of the plate is 7.8%.

After modification, the red-green chromaticity index change value delta a of the fast-growing eucalyptus wood is 9.8, the yellow-blue chromaticity index change value delta b of the fast-growing eucalyptus wood is 3.6, the lightness value delta L of the fast-growing eucalyptus wood is 0.8, and the value delta E of the fast-growing eucalyptus wood is 2.8 compared with the big fruit rosewood of normal material color (L of 40.5, a of 14.2, b of 16.6).

Claims

1. A method for regulating and controlling the color of fast growing wood by impregnating rosewood drying waste liquid is characterized by comprising the following steps;

(1) taking a certain amount of dry waste liquid, adding a certain mass of mordant into the dry waste liquid, and uniformly mixing to prepare a solution;

(2) selecting a fast-growing plate which is free of corrosion and discoloration and uniform in material quality, sawing the plate polished by abrasive paper into a certain size, and placing the plate into a vacuum reaction kettle;

(3) injecting the solution in the step (1) into a reaction kettle, completely immersing the plate in the solution, vacuumizing, and soaking for 12-36 hours;

(4) and taking out the dipped board and carrying out conventional drying treatment.

2. The method for regulating and controlling the color of the fast growing wood by using the waste rosewood drying liquid in an impregnation mode according to claim 1 is characterized in that: in the step (1), the mordant can be one of alum, blue vitriol and melanterite, and the concentration is 0.05 mol/L-0.2 mol/L.

3. The method for regulating and controlling the color of the fast growing wood by using the waste rosewood drying liquid in an impregnation mode according to claim 1 is characterized in that: in the step (2), the fast-growing board can be one of fast-growing poplar, fast-growing eucalyptus and fast-growing pine, and the initial water content of the board is 6.5-16%.