CN108284499A - A method of rapid dyeing being carried out to wood single-plate using oriental blueberry leaf - Google Patents

Abstract

The invention relates to a method for quickly dyeing wood veneers by using southern candle leaves. First, the wood veneers are dried to constant weight at 45-55°C; Take it out, rinse it with distilled water, and dry it to a moisture content of 6‑10%; immerse the dried veneer in the extract of southern candle leaves, soak it at 75‑85°C for 1‑3 hours, remove it, wash and dry it. The present invention selects southern candle leaves as the dyeing agent, has better biodegradability and environmental compatibility, and is beneficial to environmental protection. The dyeing method of the invention has low equipment requirements, is easy to operate and has strong controllability, and can be used in large-scale production. The color of the dyed veneer obtained by the method of the invention is bright and full, the dyeing is uniform, the dyeing solution has high water fastness, the dyeing is strong and the dyeing speed is fast, the damage to wood is very small, and there is no formaldehyde release, and the color is long-lasting, which is suitable for decorative stickers Surface materials and indoor household materials that require a higher concentration of formaldehyde.

Description

A method for quickly dyeing wood veneer by using southern candle leaves

technical field

The invention relates to a method for quickly dyeing wood veneers by using southern candle leaves, and belongs to the technical field of wood dyeing.

Background technique

With the development of science and technology and material processing industry, wood resources are used as raw materials, and their application scope is becoming more and more extensive. The material properties constructed by the structure and chemical composition of wood resources are becoming more and more popular, especially the natural environmental protection performance. However, due to the shortage of wood and the monotonous color of wood itself, it is increasingly unable to meet people's material needs. For this reason, wood has been dyed to enrich the decorative properties of wood. At present, acid dyes and chemical dyes are the most widely used in wood dyeing. After chemical treatment of wood in the early stage, the wood is dyed in the later stage. The dyeing process is complicated, requires high equipment, and produces dyeing wastewater treatment problems, which is not suitable for large-scale production. Production, especially in the case of higher and higher environmental protection requirements, this demand is becoming more and more prominent. Many enterprises do not have sewage treatment equipment, and they directly discharge chemically treated soaking water into the ground or river water, which causes great pollution to the land and the environment. The government's punishment affects normal production.

Nanzhu, also known as black rice tree, is a Rhododendron family plant, which is widely distributed in my country. According to the records of Materia Medica, black rice leaf has a long history of application, which can benefit essence, strengthen bones and muscles, improve eyesight, benefit stomach and nourish bone marrow, etc. It is also reported that black rice leaf can promote resynthesis of retinoid, Vp-like function, improve blood Microcirculation, anti-ulcer, anti-inflammation, anti-aging, anti-ejaculation, antibacterial and other physiological activities. At present, the research on the southern candle leaf has not attracted enough attention at home and abroad, and it is an undeveloped plant resource. While there are studies on its application to food, there is very little research on its application to wood products.

Contents of the invention

The purpose of the present invention is to solve the deficiencies of the prior art and provide a method for quickly dyeing wood by using southern candle leaves.

Technical solutions

A method for quickly dyeing wood veneers by using southern candle leaves, comprising the steps of:

(1) Dry the wood veneer at 45-55°C until the weight does not change;

(2) Immerse the dried wood veneer in the ethanol solution, heat and cook, then remove it, rinse it with distilled water, put it into a drying kiln and dry it until the water content is 6-10%;

(3) Immerse the dried wood veneer in the extract of southern candle leaves, soak at 75-85°C for 1-3h, then take it out, wash and dry, and the dyeing process is completed.

Further, in step (2), the volume concentration of the ethanol solution is 10%.

Further, in step (2), the cooking temperature is 80-90° C. and the cooking time is 2-3 hours.

Further, in step (2), when cooking, add a plastic wrap to seal above the container to prevent ethanol from evaporating.

Further, in the step (3), the preparation method of the extract of the southern candle leaves: wash the picked fresh southern candle leaves within 3 days with distilled water, cut them into leaf strips, and put the leaf strips into a refrigerator at 75-85°C Stir and extract in distilled water for 1-3 hours, then filter, and the obtained liquid is Nanzhuye extract. The solid-liquid ratio of leaf strips to distilled water is preferably 1:120 (g/ml).

Beneficial effects of the present invention: the present invention selects the natural dye Nanzhuye as the dyeing agent, which is pure natural and pollution-free, has better biodegradability and environmental compatibility, and is beneficial to environmental protection, and Nanzhuye also has antibacterial and other health care properties. effect. The dyeing method of the invention has low equipment requirements, is easy to operate and has strong controllability, and can be used in large-scale industrial production. The dyed veneer obtained by adopting the dyeing method of the present invention has bright and full color, uniform dyeing, high water fastness of the dye solution, strong dyeing and fast dyeing speed, minimal damage to wood, and no formaldehyde release, and the color is durable. It is suitable for decorative veneer materials and indoor household materials that require a high concentration of formaldehyde.

Detailed ways

The present invention will be further described below in conjunction with specific examples.

Example 1

Select 3 pieces of white oak veneer (number 1-1, 1-2, 1-3) and 3 pieces of oak wood veneer (number 1-4, 1-5, 1-6) for dyeing, the size of the veneer is 50mm ×60mm×2mm. The dyeing method comprises the following steps:

(1) Dry the wood veneer at 50°C until the weight does not change;

(2) Immerse the dried wood veneer in 10% ethanol solution, heat to 85°C and cook for 2.5 hours, separate the veneers with glass rods to ensure that the impregnating liquid is evenly soaked, and seal the container mouth with plastic wrap to prevent Ethanol evaporates; then pull out, rinse with distilled water, put into drying kiln and dry to moisture content 6%;

(3) Preparation of Nanzhu leaf extract: wash the fresh Nanzhu leaves picked within 3 days with distilled water, cut them into 0.5cm wide and 2.0cm long leaf strips, put the leaf strips into distilled water at 80°C, The ratio of solid to liquid is 1:120 (g/ml), stirring and extracting for 1.5h, and then filtering, the obtained liquid is the extract of Nanzhu Leaf. Dip the dried wood veneer in the step (2) into the extract of Nanzhu Leaf for 1.2 hours, then take it out, wash and dry, and the dyeing process is completed.

1. Color difference test before and after dyeing

Randomly select 3 points on the front of the white oak veneer (number 1-1, 1-2, 1-3) and oak veneer (number 1-4, 1-5, 1-6) before staining, and use X -rite RM200 colorimeter to measure, record the parameters, and take the average value. See Table 1 for the specific data. After adopting the method dyeing of embodiment 1, measure the chromaticity parameter of marking point again and record, adopt CIE (1976) L*, a*, b* chromaticity parameter to calculate ΔL*, Δa*, Δb* and △E*, see Table 2 for details,

△E*＝(△L* ² +△a* ² +△b* ² ) ^1/2

In the formula: △E* is the color difference, also known as the overall color difference. The larger the value, the greater the color difference between the tested object and the control sample. The judgment criteria are shown in Table 3.

Table 1 Color difference of white oak and oak before staining

Table 2 Color difference of white oak and oak wood after staining

Table 3 Relationship between color difference value and human visual perception

According to the value of △E*, that is, the difference in chromaticity before and after dyeing, it can be seen that after dyeing by the method of the present invention, the color difference is above 12.0, which shows that the color difference of the veneer before and after dyeing is very large, and the dyeing effect is good.

2. Color difference test after washing

White oak veneer (numbering 1-1, 1-2, 1-3) and oak veneer (numbering 1-4, 1-5, 1-6) after adopting the staining method dyeing of embodiment 1 are put into Put it in a beaker filled with distilled water and seal it, heat it in a water bath at 80°C for 3 hours, take it out to dry naturally, and measure the colorimetric parameters again at the marked point. Establish a record table and use CIE (1976) L*, a*, b* colorimetric parameters to calculate △L*, △a*, △b* and △E*, △E*=(△L* ² +△a* ² +△b* ² ) ^1/2 . See Table 4 for specific data. The smaller the color difference value, the greater the corresponding washing fastness.

Table 4 Color difference of white oak and oak wood after washing

According to the value of △E*, that is, the chromaticity value difference after washing, it can be seen that the veneer dyed by the dyeing method of Example 1 has little color difference before and after washing, indicating that the dyeing method of the present invention is used to dye white oak, oak The effect of wood is good, and it is not easy to fade.

Claims (6)

1. a kind of method carrying out rapid dyeing to wood single-plate using oriental blueberry leaf, which is characterized in that include the following steps：

(1) wood single-plate is dried at 45-55 DEG C, until weight does not change；

(2) wood single-plate after drying to be immersed in ethanol solution, heating carries out boiling, then pulls out, after distilled water flushing, It is put into dry kiln and dries to moisture content 6-10%；

(3) wood single-plate after drying is immersed in oriental blueberry leaf extracting solution, then 75-85 DEG C of immersion 1-3h is pulled out, carried out clear It washes, dry, that is, complete dyeing course.

2. the method as described in claim 1 for carrying out rapid dyeing to wood single-plate using oriental blueberry leaf, which is characterized in that step (2) in, ethanol solution concentration 10%.

3. the method as described in claim 1 for carrying out rapid dyeing to wood single-plate using oriental blueberry leaf, which is characterized in that step (2) in, boiling temperature is 80-90 DEG C, time 2-3h.

4. the method as described in claim 1 for carrying out rapid dyeing to wood single-plate using oriental blueberry leaf, which is characterized in that step (2) in, when boiling, above container plus preservative film sealing, ethanol evaporation is prevented.

5. such as the method that Claims 1-4 any one of them carries out rapid dyeing using oriental blueberry leaf to wood single-plate, feature It is, in step (3), the preparation method of the oriental blueberry leaf extracting solution：By the fresh oriental blueberry leaf distilled water within the 3d of picking After cleaning, it is cut into leaf item, leaf item is put into 75-85 DEG C of distilled water, then stirring extraction 1-3h is filtered, obtained liquid As oriental blueberry leaf extracting solution.

6. the method as claimed in claim 5 for carrying out rapid dyeing to wood single-plate using oriental blueberry leaf, which is characterized in that leaf item Solid-liquid ratio with distilled water is 1：120(g/ml).