CN110712261A - Bleaching composition, preparation method thereof and bleaching treatment method of olive wood - Google Patents

Bleaching composition, preparation method thereof and bleaching treatment method of olive wood Download PDF

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Publication number
CN110712261A
CN110712261A CN201911085946.1A CN201911085946A CN110712261A CN 110712261 A CN110712261 A CN 110712261A CN 201911085946 A CN201911085946 A CN 201911085946A CN 110712261 A CN110712261 A CN 110712261A
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China
Prior art keywords
bleaching
wood
agent
bleaching composition
composition
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CN201911085946.1A
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Chinese (zh)
Inventor
佘学彬
仲利涛
张念椿
杨亮庆
欧阳倩雯
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ZHONGSHAN NATURE WOOD INDUSTRY Co Ltd
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ZHONGSHAN NATURE WOOD INDUSTRY Co Ltd
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Priority to CN201911085946.1A priority Critical patent/CN110712261A/en
Publication of CN110712261A publication Critical patent/CN110712261A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/02—Staining or dyeing wood; Bleaching wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/0228—Spraying apparatus, e.g. tunnels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/08—Impregnating by pressure, e.g. vacuum impregnation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/52—Impregnating agents containing mixtures of inorganic and organic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/04—Combined bleaching or impregnating and drying of wood

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Detergent Compositions (AREA)

Abstract

The invention is suitable for the chemical field, has provided a bleaching composition and its preparation method and bleaching processing method of the olive wood, this bleaching composition adopts toluenesulfonic acid or cysteine as bleaching agent, and use of dispersant and buffer in match, compared with traditional hydrogen peroxide solution bleaching agent, the consumption of bleaching agent is small, the mass ratio in this bleaching composition system is lower than 2%, and nonirritant to human skin, etc., the formulation is mild, non-toxic, the security is high; in addition, the bleaching composition is adopted to bleach wood, so that the bleaching stability is good, the wood is not easy to fade, the bleaching effect is good, the requirement of users on the whiteness of the wood can be met, and the bleaching composition has a good market application prospect.

Description

Bleaching composition, preparation method thereof and bleaching treatment method of olive wood
Technical Field
The invention belongs to the field of chemical industry, and particularly relates to a bleaching composition, a preparation method thereof and a bleaching treatment method of olive wood.
Background
With the increasing awareness of environmental protection, more and more people tend to return to green and environment-friendly living environment. The wood as a natural material is widely applied to the aspects of buildings, civil engineering, decoration, furniture and the like, and is closely related to the life of people.
The olive wood is a preferred raw material for producing various high-quality, high-positioning and high-requirement commodity wood parts due to high density, solid wood, bright color and clear and beautiful texture. As the olives belong to the tree species with large color difference, and the color of the newly processed wood surface is easy to generate various discoloring phenomena due to exposure in air or contact with light, heat, metal or acid-base substances, the value or use value of the raw materials, semi-finished products or finished products is seriously influenced. In addition, wood furniture has a high balance requirement on color, shape, structure and the like, and discolored wood cannot be well matched with indoor environment in many cases. In order to make the wood color uniform, it is necessary to bleach the wood before the surface finish treatment.
Most of the existing wood bleaches utilize high-concentration hydrogen peroxide (also called hydrogen peroxide) and ammonia water or chloride systems to bleach the surface of wood, wherein the bleaching effect of the hydrogen peroxide is better, but the concentration of the hydrogen peroxide is too low to achieve the bleaching effect, is too high to easily damage wood fibers, increases ineffective decomposition, and the high-concentration hydrogen peroxide (the concentration of the hydrogen peroxide reaches about 30 percent) is harmful to human bodies, stimulates respiratory mucosa, can cause human hair to turn yellow after long-term contact, has strong corrosivity and is inconvenient to transport, store and use. And the bleaching of the olive wood by using the bleaching agents still can not meet the whiteness requirement required by users.
Disclosure of Invention
The embodiment of the invention provides a bleaching composition, aiming at solving the problems that the bleaching effect of the existing wood bleaching agent on wood cannot meet the whiteness requirement required by a user and the safety is not high.
The embodiment of the invention is realized by that the bleaching composition comprises the following components in percentage by mass: 0.2-1.8% of bleaching agent, 0.5-1% of dispersing agent, 0.5-0.9% of buffering agent and the balance of deionized water; wherein the bleaching agent is toluenesulfonic acid or cysteine.
The embodiment of the invention also provides a preparation method of the bleaching composition, which comprises the following steps:
weighing the components according to the formula of the bleaching composition; and adding the bleaching agent, the dispersing agent and the buffering agent into the deionized water, and stirring for 4-6 hours at the temperature of 40-70 ℃ and the rotating speed of 1200-1500 rpm to obtain the bleaching composition.
The embodiment of the invention also provides a bleaching treatment method of olive wood, which comprises the following steps:
and determining the times of spraying the bleaching composition on each part to be sprayed according to the chromaticity of the part to be sprayed of the olive wood to be bleached, wherein the spraying amount is 123-220 g/m2 each time.
The embodiment of the invention also provides another bleaching treatment method of olive wood, which comprises the following steps:
drying the cut olive wood to reduce the water content to below 15%; putting dried olive wood into a bleaching treatment container, and adding the bleaching composition into the bleaching treatment container; adjusting the pH value of the wood bleaching composition in the bleaching treatment container to 7-9, heating to 50-60 ℃, and keeping for 3-4 hours under the pressure of 0.1-0.25 MPa; and after pressure relief, taking out the olive wood, and drying to constant weight to complete the bleaching treatment of the olive wood.
According to the bleaching composition provided by the embodiment of the invention, toluenesulfonic acid or cysteine is used as a bleaching agent, and a dispersing agent and a buffering agent are matched for use, compared with a traditional hydrogen peroxide bleaching agent, the usage amount of the bleaching agent is small, the mass ratio in a system of the bleaching composition is lower than 2%, and the bleaching composition has no irritation to human skin and the like, is mild and nontoxic in formula and is high in safety; in addition, the bleaching composition is adopted to bleach wood, so that the bleaching stability is good, the wood is not easy to fade, the bleaching effect is good, the requirement of users on the whiteness of the wood can be met, and the bleaching composition has a good market application prospect.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
According to the bleaching composition provided by the embodiment of the invention, toluenesulfonic acid or cysteine is used as a bleaching agent, and a dispersing agent and a buffering agent are matched for use, compared with a traditional hydrogen peroxide bleaching agent, the usage amount of the bleaching agent is small, the mass ratio in a system of the bleaching composition is lower than 2%, and the bleaching composition has no irritation to human skin and the like, is mild and nontoxic in formula and is high in safety; in addition, the bleaching composition is adopted to bleach wood, so that the bleaching stability is good, the wood is not easy to fade, the bleaching effect is good, the requirement of users on the whiteness of the wood can be met, and the bleaching composition has a good market application prospect.
The embodiment of the invention provides a bleaching composition which comprises the following components in percentage by mass: 0.2-1.8% of bleaching agent, 0.5-1% of dispersing agent, 0.5-0.9% of buffering agent and the balance of deionized water; wherein the bleaching agent is toluenesulfonic acid or cysteine.
Preferably, the bleaching agent is a toluenesulfonic acid solution with the purity of 95% and the concentration of 8-10%.
Preferably, the bleaching agent is a cysteine solution with the purity of 95% and the concentration of 8.5-10%.
Preferably, the dispersing agent is a sodium dodecyl sulfate solution with the purity of 98% and the concentration of 9.5-10%.
Preferably, the buffering agent is sodium carbonate with the purity of 99% and the concentration of 8-10%, sodium bicarbonate with the purity of 98% and the concentration of 9-10%, or sodium silicate with the purity of 97% and the concentration of 8.5-10%, or a mixture of any combination of the above.
In the embodiment of the invention, under the mutual cooperation of the bleaching agent with the concentration and the purity, the dispersing agent and the buffering agent, the bleaching effect is good, the treatment time period is short, the environmental pollution is small, and the bleaching cost is low.
Preferably, the bleaching composition comprises the following components in percentage by mass: 1.5% of bleaching agent, 0.5% of dispersing agent, 0.5% of buffering agent and the balance of deionized water.
The embodiment of the invention also provides a preparation method of the bleaching composition, which comprises the following steps:
weighing the components according to the formula of the bleaching composition; and adding the bleaching agent, the dispersing agent and the buffering agent into the deionized water, and stirring for 4-6 min under the conditions that the temperature is 40-70 ℃ and the rotating speed is 1000-1500 rpm, so as to obtain the bleaching composition.
In a preferred embodiment of the present invention, the bleaching agent, the dispersant and the buffering agent are added into the deionized water, and stirred for 5min at the temperature of 60 ℃, the pH value of 8 and the rotation speed of 1000 rpm, so as to obtain the bleaching composition.
The wood color is generated by two main reasons, namely that lignin contains C ═ C bonds and carbonyl groups (C ═ C)>C ═ O), vinyl (CH)2CHR), hydroxyl (-OH), and methoxy (-OCH)3) And carboxyl (-COOH) groups, which make the wood absorb visible light with certain wavelength to show certain color; secondly, the wood has extract, and the pigment, tannin and resin in the extract can make the wood colored. In addition, factors that affect wood discoloration and fading are light, enzymes, heat, oxygen, biological contamination (fungi), sources of chemical contamination (e.g., metals, acids, bases, etc.), and the like.
In the embodiment of the invention, toluenesulfonic acid or cysteine is used as an active ingredient of a bleaching agent, and the toluenesulfonic acid or the cysteine can react with a colored group such as tannic acid in wood to generate a colorless group under a certain alkaline condition, namely, the bleaching agent is used for destroying carbonyl and carbon atoms in a colored component of the woodBond between valence bonds and destruction of hydroxy (-OH), methoxy (-OCH)3) And carboxyl and other color assisting groups to realize the purpose of bleaching.
The embodiment of the invention also provides a bleaching treatment method of olive wood, which comprises the following steps: determining the times of spraying the bleaching composition on each part to be sprayed according to the chromaticity of the part to be sprayed of the olive wood to be bleached, wherein the spraying amount is 123-220 g/m2。
In the embodiment of the present invention, the parts of the wood that need to be bleached are compared by using a color plate, and then the number of times and the spraying amount of the bleaching composition need to be sprayed to each part are determined according to the color shade comparison condition of each part of the wood. For example, the number of times and the amount of spraying may be increased as appropriate for darker portions, and the amount of spraying may be decreased for lighter portions.
As an exemplary embodiment of the present invention, for the olive wood having a darker wood color (for example, the whiteness of a dark portion is 20% to 25%), in order to make the whiteness of the dark portion to be 40%, 200g/m may be sprayed on the dark portion of the surface of the olive wood2And spraying once. For wood parts that are particularly dark, e.g., less than 10% of the original whiteness, the spray application can be repeated one or more times until the desired whiteness is achieved. This allows for flexibility in practical use.
For the dark parts, the bleaching agent can be sprayed and coated again for 2 to 3 hours after each time until the bleached parts reach the whiteness required by a user.
In the embodiment of the invention, when a product (part) with a particularly dark color needs to be bleached, the proportion of the buffering agent of the invention in the bleaching composition can be adjusted and increased so that the pH value of the bleaching composition system reaches 7-9, and is optimally 8, thereby ensuring the bleaching effect and efficiency.
The embodiment of the invention also provides another bleaching treatment method of olive wood, which comprises the following steps:
drying the cut olive wood to reduce the water content to below 15%; putting dried olive wood into a bleaching treatment container, and adding the bleaching composition into the bleaching treatment container; adjusting the pH value of the wood bleaching composition in the bleaching treatment container to 7-9, heating to 50-60 ℃, and keeping for 3-4 hours under the pressure of 0.1-0.25 MPa; and after pressure relief, taking out the olive wood, and drying to constant weight to complete the bleaching treatment of the olive wood.
Under the conditions of medium and alkaline, the bleaching composition in the bleaching treatment container is heated to 50-60 ℃ and pressurized to 0.1-0.25 MPa for treatment, so that the reaction efficiency of the bleaching agent and the chromophoric groups of the olive wood can be accelerated, the bleaching efficiency is improved, and an ideal bleaching effect can be obtained.
In a preferred embodiment of the present invention, the step of adjusting the pH of the bleaching composition in the bleaching treatment container to 7 to 9, raising the temperature to 50 to 60 ℃, and maintaining the bleaching composition under a pressure of 0.1 to 0.25MPa for 3 to 4 hours specifically comprises: the bleaching composition in the bleaching treatment vessel was adjusted to pH 8 and heated to 50 ℃ for 4 hours at a pressure of 0.15 MPa.
The technical effects of the technical solution of the present invention will be further described below by specific examples.
Examples 1,
The bleaching agent composition provided by the embodiment of the invention is prepared by the following steps:
weighing the components according to the following formula of the bleaching composition for later use: 2g of toluenesulfonic acid solution with purity of 95% and concentration of 10%; 8g of sodium dodecyl sulfate solution with the purity of 98 percent and the concentration of 10 percent; 5g of sodium carbonate with the purity of 99 percent and the concentration of 10 percent; 98.5g of deionized water with the conductivity less than or equal to 0.056 us/cm.
And adding the bleaching agent, the dispersing agent and the buffering agent into the deionized water, and stirring for 5min at the temperature of 40 ℃ and the rotating speed of 1000 rpm to obtain the bleaching composition.
Examples 2,
The bleaching agent composition provided by the embodiment of the invention is prepared by the following steps:
weighing the components according to the following formula of the bleaching composition for later use: 0.5g of toluenesulfonic acid solution with purity of 95% and concentration of 8%; 5g of a sodium dodecyl sulfate solution with the purity of 98% and the concentration of 9.5%; 7g of sodium bicarbonate with the purity of 99% and the concentration of 10%; 98.3g of deionized water with the conductivity less than or equal to 0.056 us/cm.
And adding the bleaching agent, the dispersing agent and the buffering agent into the deionized water, and stirring for 5min at the temperature of 50 ℃ and the rotating speed of 1200 rpm to obtain the bleaching composition.
Examples 3,
The bleaching agent composition provided by the embodiment of the invention is prepared by the following steps:
weighing the components according to the following formula of the bleaching composition for later use: 9g of a 9% toluenesulfonic acid solution with a purity of 95%; 10g of sodium dodecyl sulfate solution with the purity of 98 percent and the concentration of 10 percent; 9g of sodium silicate with the purity of 99 percent and the concentration of 10 percent; 97.2g of deionized water with the conductivity less than or equal to 0.056 us/cm.
And adding the bleaching agent, the dispersing agent and the buffering agent into the deionized water, and stirring for 4min at the temperature of 60 ℃ and the rotating speed of 1000 rpm to obtain the bleaching composition.
Examples 4,
The bleaching agent composition provided by the embodiment of the invention is prepared by the following steps:
weighing the components according to the following formula of the bleaching composition for later use: 15g of toluenesulfonic acid solution with purity of 95% and concentration of 10%; 6g of sodium dodecyl sulfate solution with the purity of 98 percent and the concentration of 10 percent; 6.5g of sodium silicate with the purity of 99 percent and the concentration of 10 percent; 97.25g of deionized water with the conductivity less than or equal to 0.056 us/cm.
And adding the bleaching agent, the dispersing agent and the buffering agent into the deionized water, and stirring for 6min at the temperature of 50 ℃ and the rotating speed of 1500 rpm to obtain the bleaching composition.
Examples 5,
The bleaching agent composition provided by the embodiment of the invention is prepared by the following steps:
weighing the components according to the following formula of the bleaching composition for later use: 18g of toluenesulfonic acid solution with purity of 95% and concentration of 10%; 9g of sodium dodecyl sulfate solution with the purity of 98 percent and the concentration of 10 percent; 5.5g of sodium silicate with the purity of 99 percent and the concentration of 10 percent; 96.75g of deionized water with the conductivity less than or equal to 0.056 us/cm.
And adding the bleaching agent, the dispersing agent and the buffering agent into the deionized water, and stirring for 4min at the temperature of 60 ℃ and the rotating speed of 1000 rpm to obtain the bleaching composition.
Examples 6,
The bleaching agent composition provided by the embodiment of the invention is prepared by the following steps:
weighing the components according to the following formula of the bleaching composition for later use: 2g of cysteine solution with the purity of 95 percent and the concentration of 8.5 percent; 5.5g of a sodium dodecyl sulfate solution with the purity of 98% and the concentration of 9.5%; 6g of sodium silicate with the purity of 99 percent and the concentration of 10 percent; 98.65g of deionized water with the conductivity less than or equal to 0.056 us/cm.
And adding the bleaching agent, the dispersing agent and the buffering agent into the deionized water, and stirring for 5min at the temperature of 50 ℃ and the rotating speed of 1300 rpm to obtain the bleaching composition.
Example 7,
The bleaching agent composition provided by the embodiment of the invention is prepared by the following steps:
weighing the components according to the following formula of the bleaching composition for later use: 15g of cysteine solution with the purity of 95 percent and the concentration of 10 percent; 5g of sodium dodecyl sulfate solution with the purity of 98 percent and the concentration of 10 percent; 5g of sodium carbonate with the purity of 99 percent and the concentration of 10 percent; 97.5g of deionized water with the conductivity less than or equal to 0.056 us/cm.
And adding the bleaching agent, the dispersing agent and the buffering agent into the deionized water, and stirring for 5min at the temperature of 60 ℃ and the rotating speed of 1000 rpm to obtain the bleaching composition.
Example 8,
The bleaching agent composition provided by the embodiment of the invention is prepared by the following steps:
weighing the components according to the following formula of the bleaching composition for later use: 18g of cysteine solution with the purity of 95 percent and the concentration of 10 percent; 7.5g of sodium dodecyl sulfate solution with the purity of 98 percent and the concentration of 10 percent; 9g of sodium bicarbonate with the purity of 99% and the concentration of 8%; 96.55g of deionized water with the conductivity less than or equal to 0.056 us/cm.
And adding the bleaching agent, the dispersing agent and the buffering agent into the deionized water, and stirring for 5min at the temperature of 60 ℃ and the rotating speed of 1000 rpm to obtain the bleaching composition.
Examples 9,
The bleaching agent composition provided by the embodiment of the invention is prepared by the following steps:
weighing the components according to the following formula of the bleaching composition for later use: 12g of cysteine solution with the purity of 95 percent and the concentration of 10 percent; 10g of sodium dodecyl sulfate solution with the purity of 98 percent and the concentration of 10 percent; 7.5g of sodium bicarbonate with the purity of 99 percent and the concentration of 10 percent; 97.05g of deionized water with the conductivity less than or equal to 0.056 us/cm.
And adding the bleaching agent, the dispersing agent and the buffering agent into the deionized water, and stirring for 5min at the temperature of 60 ℃ and the rotating speed of 1000 rpm to obtain the bleaching composition.
Examples 10,
The bleaching agent composition provided by the embodiment of the invention is prepared by the following steps:
weighing the components according to the following formula of the bleaching composition for later use: 6g of cysteine solution with the purity of 95 percent and the concentration of 10 percent; 7g of sodium dodecyl sulfate solution with the purity of 98 percent and the concentration of 10 percent; 7g of sodium bicarbonate with the purity of 99% and the concentration of 10%; 98g of deionized water with the conductivity less than or equal to 0.056 us/cm.
And adding the bleaching agent, the dispersing agent and the buffering agent into the deionized water, and stirring for 5min at the temperature of 60 ℃ and the rotating speed of 1100 r/min to obtain the bleaching composition.
Test one,
The bleaching compositions prepared by the methods of the present invention in examples 1 to 10The bleaching composition is subjected to a performance test, and the specific test method is as follows: 10 parts of an olive wood sample with 18.5% of original whiteness are prepared in advance and are respectively numbered as No. 1-10, wherein the No. 1 sample uses the bleaching agent composition provided by the embodiment 1 of the invention, the No. 2 sample uses the bleaching agent composition provided by the embodiment 2 of the invention, the No. 3 sample uses the bleaching composition … … provided by the embodiment 3 of the invention, and the like, and the No. 10 sample uses the bleaching composition provided by the embodiment 10 of the invention. During the test, each group of samples was sprayed 2 times, each time at 185g/m2And the spraying interval is 2 hours each time, standing is carried out for 4 hours after spraying, after the wood is dried, the whiteness of each sample is detected and recorded by adopting a DP-3 type full-automatic color measurement colorimeter, each sample is measured at 3 different positions, the average value is obtained, and the specific test result is shown in the following table 1:
wherein, the higher the whiteness, the better the bleaching effect is, otherwise, the worse is.
TABLE 1
Bleaching composition sample Whiteness of sample before spray coating Whiteness of sprayed sample Degree of whiteness increase
Example 1 18.5％ 31.5％ +13％
Example 2 18.5％ 35.5％ +15％
Example 3 18.5％ 33％ +12.5％
Example 4 18.5％ 37.6％ +19.1％
Example 5 18.5％ 37.2％ +18.7％
Example 6 18.5％ 39.3％ +20.8％
Example 7 18.5％ 43.5％ +25％
Example 8 18.5％ 41％ +22.5％
Example 9 18.5％ 41.5％ +23％
Example 10 18.5％ 39.5％ +21％
As can be seen from the test results in table 1 above, when the bleaching composition provided in embodiments 1 to 10 of the present invention is used to perform a bleaching test on olive wood with an original whiteness of 18.5%, the test results show that the bleaching composition provided in embodiments of the present invention can increase the whiteness of olive wood with an original whiteness of 18.5% to 31.5% to 43.5% after bleaching, and the maximum whiteness increase range can reach 25%, so that the bleaching composition provided in embodiments of the present invention has a good bleaching effect on wood. And after the test, the bleached wood is not discolored, so that the bleaching effect stability of the bleaching composition is good.
Test II,
1. Test reagents ① bleaching composition according to example 7 of the present invention, ②% hydrogen peroxide (30% strength), ③% sodium sulfite solution (2.5% strength), ④% sulfur dioxide solution (1.5% strength), ⑤% glacial acetic acid solution (1% strength), ⑥% sodium hypochlorite solution (2% strength).
2. The test method comprises the following steps:
preparing 6 parts of an olive wood sample with 18.5% of original whiteness, numbering 1-6, wherein the No. 1 sample is correspondingly sprayed by the reagent ①, the No. 2 sample is correspondingly sprayed by the reagent ②, the No. 3 sample is correspondingly sprayed by the reagent ③ … …, and the like, the No. 6 sample is correspondingly sprayed by the reagent ⑥, in the testing process, each group of samples is sprayed by the reagents ① - ⑥ to corresponding test wood samples, each group of samples is sprayed for 2 times, and the spraying amount of each time is 185g/m2Spraying for 2 hours at intervals, standing for 4 hours after spraying, drying the wood, detecting the whiteness of each sample by using a DP-3 type full-automatic color measurement colorimeter, recording, and measuring 3 different samplesThe position of (a) is averaged, and the specific test results are shown in table 2 below:
TABLE 2
Test reagent Whiteness of sample before spray coating Whiteness of sprayed sample Degree of whiteness increase
Reagent ① 18.5％ 43.5％ +25％
Reagent ② 18.5％ 37％ +18.5％
Reagent ③ 18.5％ 29.8％ +11.3％
Reagent ④ 18.5％ 34.6％ +16.1％
Reagent ⑤ 18.5％ 32.7％ +14.2％
Reagent ⑥ 18.5％ 31.5％ +13％
As can be seen from the test results in table 2 above, the bleaching composition provided in example 7 of the present invention has better bleaching effect on the olive wood with 18.5% original whiteness than the bleaching composition provided in the above agents ② - ⑥, and the whiteness of the olive wood is improved by 25%.
Test No. three,
The concentration of the cysteine solution in the bleaching composition of example 7 of the present invention was preferably selected by a one-way test method, the performance of each of the bleaching compositions prepared by fixing the other components in the bleaching composition and changing the concentration of the cysteine solution to 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11% was tested. The test method comprises the following steps: the bleaching compositions were used to spray samples of olive wood having a whiteness of 18.5% 1 time per sample, at a rate of 165g/m2Standing for 4 hours after spraying, airing the wood, detecting the whiteness of each sample by adopting a DP-3 type full-automatic color measurement colorimeter and recording, measuring 3 different positions of each sample, and taking an average value, wherein the specific test result is shown in the following table 3:
TABLE 3
Testing reagent concentration Spraying of paintWhiteness of front sample Whiteness of sprayed sample Degree of whiteness increase
7％ 18.5％ 20.3％ +1.8％
7.5％ 18.5％ 22.3％ +3.8％
8％ 18.5％ 24.6％ +6.1％
8.5％ 18.5％ 28.8％ +10.3％
9％ 18.5％ 30.5％ +12％
9.5％ 18.5％ 31.9％ +13.3％
10％ 18.5％ 30％ +11.5％
10.5％ 18.5％ 25.4％ +6.9％
11％ 18.5％ 24.2％ +5.7％
From the test results in table 3 above, it can be seen that the bleaching effect is gradually increased when the concentration of the cysteine solution is gradually increased from 7%, the whiteness increasing range of the wood is obvious and can reach 10.3% when the concentration of the cysteine solution reaches 8.5%, the whiteness increasing range reaches a peak value when the concentration of the cysteine solution is increased to 9.5%, and then the whiteness increasing range gradually decreases, and the whiteness decreasing range is obvious when the concentration of the cysteine solution is increased to 10.5%, so that the concentration of the cysteine solution is preferably in the range of 8.5% -10% in consideration of the bleaching effect and the cost.
Test four,
The bleaching compositions of example 7 of the present invention were optimized for concentration in the toluene sulfonic acid solution using a one-way test method, with the other components of the bleaching composition fixed and the toluene sulfonic acid solution concentration varied to 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, and the resulting groups of bleaching compositions were tested for performance. The test method comprises the following steps: the bleaching compositions were used to spray a sample of olive wood having 18.5% whiteness, 1 time at 165g/m2After spraying, standing for 4 hours, after the wood is dried, detecting the whiteness of each sample by using a DP-3 type full-automatic color measurement colorimeter and recording, measuring 3 different positions of each sample, and taking an average value, wherein the specific test result is shown in the following table 4:
TABLE 4
Testing reagent concentration Whiteness of sample before spray coating Whiteness of sprayed sample Degree of whiteness increase
7％ 18.5％ 20％ +1.5％
7.5％ 18.5％ 21.5％ +3％
8％ 18.5％ 27.4％ +8.9％
8.5％ 18.5％ 28％ +9.5％
9％ 18.5％ 30.6％ +12.1％
9.5％ 18.5％ 31.2％ +12.7％
10％ 18.5％ 30.8％ +12.3％
10.5％ 18.5％ 23.9％ +5.4％
11％ 18.5％ 23.7％ +5.2％
From the test results in table 4 above, it can be known that the bleaching effect of the toluene sulfonic acid solution is gradually increased when the concentration of the toluene sulfonic acid solution is gradually increased from 7%, the whiteness increasing range of the wood is obvious and can reach 8.9% when the concentration of the toluene sulfonic acid solution reaches 8%, the whiteness increasing range reaches a peak value when the concentration of the toluene sulfonic acid solution is increased to 9.5%, the whiteness increasing range gradually decreases thereafter, and the whiteness decreasing range is obvious when the concentration of the toluene sulfonic acid solution is increased to 10.5%, therefore, the concentration of the toluene sulfonic acid solution is preferably in the range of 8% -10% in consideration of the bleaching effect and the cost.
Test five,
Comparative example 1, which differs from example 7 above only in that, in preparing the bleaching composition, the procedure "adding the bleaching agent, the dispersant and the buffer to the deionized water and stirring at a temperature of 60 ℃ and a rotation speed of 1000 rpm for 5 min" was modified to "adding the bleaching agent, the dispersant and the buffer to the deionized water and stirring at a temperature of 20 ℃ and a rotation speed of 1000 rpm for 5 min". I.e. the temperatures of the two are different.
The bleaching compositions provided in comparative example 1 and example 7 were used to spray 2 times a sample of olive wood having 18.5% of its original whiteness, each time at 180g/m2After spraying, standing for 4h, after the wood is dried, detecting the whiteness of each sample by using a DP-3 type full-automatic color measurement colorimeter and recording, measuring 3 different positions of each sample, and taking an average value, wherein the specific test result is shown in the following table 5:
TABLE 5
Test reagent Whiteness of sample before spray coating Whiteness of sprayed sample Degree of whiteness increase
Comparative example 1 18.5％ 40.2％ +21.7％
Example 7 18.5％ 43.5％ +25％
As can be seen from the test results of table 5 above, the bleaching composition prepared by adding the bleaching agent, the dispersant and the buffer to deionized water at 60 ℃ and stirring in example 7 according to the present invention has better bleaching effect than the bleaching composition prepared by adding the bleaching agent, the dispersant and the buffer to deionized water at 20 ℃ and stirring in comparative example 1. This is because raising the temperature to 60 c accelerates the rate of molecular movement of the bleach, dispersant and buffering agent in the deionized water, increases the effective collisions between molecules, and accelerates the binding action between the bleach active ingredient and the colored groups of the wood, thereby accelerating the rate of bleaching of the wood.
Test six,
The bleach composition of example 7 of the present invention was optimized for performance using a one-way test method, with the other components of the bleaching composition being fixed and the bleach composition being varied to 0.1%, 0.2%, 0.5%, 1%, 1.2%, 1.5%, 1.8%, 2%, 2.5%, and each of the resulting bleach composition groups being tested for performance. The test method comprises the following steps: the bleaching compositions are used for spraying olive wood samples with 18.5% of original whiteness, and the spraying amount is 165g/m for 2 times2After spraying, standing for 4h, after the wood is dried, detecting the whiteness of each sample by using a DP-3 type full-automatic color measurement colorimeter and recording, measuring 3 different positions of each sample, and taking an average value, wherein the specific test result is shown in the following table 6:
TABLE 6
Figure BDA0002264848130000141
As can be seen from the test results in table 6 above, when the amount of the bleaching agent is 0.1%, the whiteness of the bleached wood is increased by 5.8%, when the amount of the bleaching agent is gradually increased, the bleaching effect of the bleached wood is gradually enhanced, when the amount of the bleaching agent is 1.5%, the bleaching effect is optimal, and then, when the amount of the bleaching agent is increased, the bleaching effect is not increased greatly and shows a gradual decrease trend, and when the amount of the bleaching agent is increased to 2%, the decrease is significant, so that, in consideration of the bleaching effect and the cost, the amount of the bleaching agent used in the embodiment of the present invention is preferably 0.2% to 1.8%.
Test seven,
Comparative examples 2,
Drying the cut olive wood to reduce the water content to below 15%, and testing the original whiteness of the wood; putting the dried olive wood into a bleaching treatment container, adding the bleaching composition provided by the embodiment 7 of the invention into the bleaching treatment container, and immersing the olive wood; adjusting the pH of the wood bleaching composition in the bleaching vessel to 8, raising the temperature to 60 ℃, and maintaining the pressure at 0.15MPa for 4 hours; after pressure relief, the olive wood is taken out and dried to constant weight, the whiteness of each sample is detected and recorded by a DP-3 type full-automatic color measurement colorimeter, each sample is measured at 3 different positions, and an average value is obtained.
Comparative examples 3,
This comparative example is essentially the same as the test procedure of comparative example 2 above, except that the pH of the wood bleaching composition in the bleaching treatment vessel was adjusted to 8 and the temperature was raised to 60 ℃ for 4 hours at a pressure of 0.1 MPa.
Comparative examples 4,
This comparative example is essentially the same as the test procedure of comparative example 2 above, except that the pH of the wood bleaching composition in the bleaching treatment vessel was adjusted to 8 and the temperature was raised to 60 ℃ for 4 hours at a pressure of 0.25 MPa.
Comparative examples 5,
This comparative example is essentially the same as the test procedure of comparative example 2 above, except that the pH of the wood bleaching composition in the bleaching treatment vessel was adjusted to 8 and the temperature was raised to 60 ℃ for 4 hours at a pressure of 0.30 MPa.
Comparative examples 6,
This comparative example is essentially the same as the test procedure of comparative example 2 above, except that the pH of the wood bleaching composition in the bleaching treatment vessel was adjusted to 8 and the temperature was raised to 60 ℃ for 4 hours.
The above comparative examples 2 and 3 were repeated for 3 times, and the test results of the 3 tests were averaged, and are shown in Table 7 below.
TABLE 7
Test example Whiteness of sample before spray coating Whiteness of sprayed sample Degree of whiteness increase
Comparative example 2 19.6％ 42.5％ +22.9％
Comparative example 3 19.6％ 41.2％ +21.69％
Comparative example 4 19.6％ 40.9％ +21.3％
Comparative example 5 19.6％ 41.0％ +21.4％
Comparative example 6 19.6％ 36.4％ +16.8％
From the test results in table 7 above, it can be seen that when the bleaching composition in the bleaching treatment container is pressurized to 0.1-0.25 MPa, the original whiteness of the wood can be increased from 19.6% to 40.9% -42.5%; when the whiteness of the wood is increased continuously, the increase amplitude of the whiteness of the wood tends to be smooth, and the increase amplitude of the whiteness of the wood is obviously lower than the whiteness obtained by pressurization treatment without pressurization, so that the production cost and the bleaching effect are comprehensively considered, the bleaching composition in a bleaching treatment container is pressurized to 0.1-0.25 MPa, the reaction efficiency of a bleaching agent and chromophoric groups of the olive wood is favorably accelerated, the bleaching efficiency is improved, an ideal bleaching effect is obtained, most of substances contained in the olive wood can be removed after soaking treatment, and the use value and the value of the olive wood are improved.
In summary, the bleaching composition provided by the embodiment of the invention adopts toluenesulfonic acid or cysteine as the bleaching agent, and is matched with the dispersant and the buffer for use, compared with the traditional hydrogen peroxide bleaching agent, the usage amount of the bleaching agent is small, the mass ratio in the system of the bleaching composition is lower than 2%, so that a good bleaching effect can be achieved, and the bleaching composition has no irritation to human skin and the like, and is mild and non-toxic in formula and high in safety; in addition, the bleaching composition is adopted to bleach wood, so that the bleaching stability is good, the wood is not easy to fade, the bleaching effect is good, the requirement of users on the whiteness of the wood can be met, and the bleaching composition has a good market application prospect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A bleaching composition is characterized by comprising the following components in parts by mass:
0.2 ~ 1.8.8% of bleaching agent, 0.5 ~ 1% of dispersing agent, 0.5 ~ 0.9.9% of buffering agent and the balance of deionized water;
wherein the bleaching agent is toluenesulfonic acid or cysteine.
2. The bleaching composition according to claim 1 wherein said bleaching agent is a 95% pure, 8 ~ 10% strength solution in toluene sulfonic acid.
3. The bleaching composition according to claim 1 wherein the bleaching agent is a 95% pure, 8.5 ~ 10% strength cysteine solution.
4. The bleaching composition of claim 1 wherein the dispersant is a sodium lauryl sulfate solution having a purity of 98% and a concentration of 9.5 ~ 10%.
5. The bleaching composition according to claim 1 wherein the buffering agent is sodium carbonate of 99% purity and 8 ~ 10% concentration, sodium bicarbonate of 98% purity and 9 ~ 10% concentration, or sodium silicate of 97% purity and 8.5 ~ 10% concentration, or a mixture of any combination thereof.
6. The bleaching composition according to claim 1, comprising the following components in parts by mass:
1.5% of bleaching agent, 0.5% of dispersing agent, 0.5% of buffering agent and the balance of deionized water.
7. A method of preparing a bleaching composition according to any one of claims 1 ~ 6, comprising the steps of:
weighing the components according to the formulation of the bleaching composition of any of claims 1 ~ 6;
and adding the bleaching agent, the dispersing agent and the buffering agent into the deionized water, and stirring for 4 ~ 6min at the temperature of 40 ~ 70 ℃ and the rotating speed of 1000 ~ 1500 rpm/min to obtain the bleaching composition.
8. A bleaching treatment method of olive wood is characterized by comprising the following steps:
the number of times the bleaching composition according to claim 7 is sprayed per part to be sprayed is determined according to the color of the part to be sprayed of the olive wood to be bleached, wherein the spraying amount per time is 123 ~ 220g/m2。
9. A bleaching treatment method of olive wood is characterized by comprising the following steps:
drying the cut olive wood to reduce the water content to below 15%;
placing the dried olive wood in a bleaching treatment vessel, adding the bleaching composition of claim 7 to the bleaching treatment vessel;
adjusting the pH of the wood bleaching composition in the bleaching treatment vessel to 7 ~ 9 and raising the temperature to 50 ~ 60 ℃ for 3 ~ 4 hours at a pressure of 0.1 ~ 0.25.25 MPa;
and after pressure relief, taking out the olive wood, and drying to constant weight to complete the bleaching treatment of the olive wood.
10. The method for bleaching olive wood according to claim 9, wherein the step of adjusting the pH of the bleaching composition in the bleaching container to 7 ~ 9, raising the temperature to 50 ~ 60 ℃, and maintaining the pressure at 0.1 ~ 0.25MPa for 3 ~ 4 hours is specifically:
the bleaching composition in the bleaching treatment vessel was adjusted to pH 8 and heated to 50 ℃ for 4 hours at a pressure of 0.15 MPa.
CN201911085946.1A 2019-11-07 2019-11-07 Bleaching composition, preparation method thereof and bleaching treatment method of olive wood Pending CN110712261A (en)

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