CN112297168A - Bleaching method for sparrow-eye maple wood bark - Google Patents
Bleaching method for sparrow-eye maple wood bark Download PDFInfo
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- CN112297168A CN112297168A CN202011276017.1A CN202011276017A CN112297168A CN 112297168 A CN112297168 A CN 112297168A CN 202011276017 A CN202011276017 A CN 202011276017A CN 112297168 A CN112297168 A CN 112297168A
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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
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Abstract
The invention provides a bleaching method of a sparrow-eye maple bark, the new bleaching and whitening technology of the sparrow-eye maple bark is a one-bath two-step method, no new working procedure is added, the first step adopts a reducing agent to carry out reduction treatment for 2 hours at 60 ℃ under a neutral condition, most of pigments of lignin and lignin are removed, then hydrogen peroxide, hydrogen peroxide low-temperature activator cyclic adipic dihydrazide and a whitening agent 4BK are added, and low-temperature treatment is carried out for 3 hours at 65 ℃ under the condition of weak base pH8-9, the sparrow-eye maple treated by the new bleaching and whitening one-bath technology has the advantages that the bleaching temperature is reduced by 10-20 ℃, the bleaching time is saved by about 1-2 hours, the bleaching whiteness is improved by 20%, the grain and sparrow-eye definition of the bark is greatly improved compared with that of the traditional bleaching method, the glossiness is improved, after the bleaching of the sparrow-eye maple bark by the one-bath two-, the natural texture and the sparrow eyes are clearer, and the dried veneer is stable in size and not easy to deform.
Description
Technical Field
The invention relates to the technical field of bleaching, in particular to a bleaching method of a sparrow-eye maple bark.
Background
The natural sparrow-eye maple is one of the fantastic wood skins, has clear lines and light color, is most suitable for being used as hotel furniture, and looks luxurious. Maple and sparrow eyes, which are produced in the united states and canada, are commonly used as interior decoration veneers, have certain textures, are large and dense, and have better shadow quality.
The natural sparrow eyes are used as wood, and are natural materials with the highest affinity with human beings in three building materials, the wood skin can be used as various furniture, the application of the automobile industry and the like, the usability, the reproducibility and the important economic value are very high, along with the more and more profound understanding of people on environmental protection, the trend of future development is to replace the traditional chemical coating decoration with the pure natural wood skin, the natural sparrow eye maple wood skin is loose in material, uneven in surface material color and dark in color, and the wood skin is easy to change color in the placing process, so that the application of the natural sparrow eye maple wood skin in furniture, wood boards, automobiles and the like is limited to a certain extent.
The traditional bleaching of the sparrow-eye maple wood skin adopts three-high 'high-alkali, high-hydrogen peroxide and high-temperature' chemicals, the bleaching time is long, the temperature is high, the wood skin is easy to deform, the whiteness is low, and the surface and the internal structure of the bleached wood skin are greatly damaged.
The traditional bleaching process is adopted in the market at present, the usage amount of hydrogen peroxide is 60-100g/L, the usage amount of sodium hydroxide is 30-40g/L, the bleaching temperature is 80-85 ℃, and the bleaching time is 6-8 hours. The traditional bleaching process has the disadvantages of large chemical consumption, high temperature, long time, large COD (chemical oxygen demand) discharged by bleached sewage, high whiteness after the bleaching process of the peacock-eye maple wood, reduced natural texture and clarity of the peacock-eye maple wood bark, reduced grade quality of the bleached product, and easy deformation of the bleached wood bark after being dried due to long-time high-temperature bleaching. The traditional bleaching process of the peacock's eye maple wood bark restricts the development of the processing of the peacock's eye maple wood bark.
Therefore, it is necessary to provide a bleaching process for the maple wood bark. The invention provides an ecological high-efficiency natural bleaching technology for the natural sparrow eye maple wood bark, which replaces the traditional bleaching technology for the sparrow eye maple wood bark and has very great ecological benefit, economic benefit and social benefit.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a bleaching method for the maple wood bark with the peacock eyes, and the method does not increase the discharge amount of the sewage of the bleaching process. The whiteness of the bleached veneer can be improved by more than 20% compared with the whiteness of the traditional method, in addition, the appearance quality of the veneer is more beautiful, the natural texture and the sparrow eyes are clearer, the size of the dried veneer is stable, and the veneer is not easy to deform.
The technical scheme of the invention is as follows: a bleaching method of a sparrow-eye maple bark comprises the following steps:
s1), the first bleaching,
loading the maple wood bark into a bark bleaching frame, adding a certain amount of sodium hydroxide, stirring and dissolving a certain amount of sodium borohydride, injecting into the bark bleaching frame, injecting a certain amount of thiourea dioxide into the bark bleaching frame, stirring uniformly, adding a large amount of bubbles when the frame is just opened, reacting violently, slowly heating to 50-60 ℃, and preserving heat for 2-3 hours;
s2), second bleaching
Stirring and dissolving a certain amount of the cyclic adipic acid dihydrazide with hot water at 50-65 ℃, injecting the solution into the veneer bleaching frame in the step S1), then slowly injecting a certain amount of hydrogen peroxide, sodium hydroxide and a whitening agent 4BK, keeping the temperature at 50-65 ℃ for 1-5 hours, and then dehydrating and drying.
Further, in step S1), the mass ratio of thiourea dioxide to sodium borohydride is 4: 1.
Further, the pH of the reaction system of the step S1) is 6.0 to 7.0.
Further, the bath ratio of the reaction system of step S1) was 1: 10.
Further, the pH of the reaction system of the step S2) is 8 to 9.
Further, in step S1), the amount of sodium borohydride is 0.5-2.0g/L, the amount of thiourea dioxide is 2.0-8.0g/L, and the amount of sodium hydroxide is 0.5-1.0 g/L.
Further, in step S2), the amount of hydrogen peroxide is 15.0 to 30g/L, the amount of the cyclic adipic acid dihydrazide (hydrogen peroxide activator) is 5 to 10g/L, the amount of the brightener 4BK is 4 to 6g/L, and the amount of the sodium hydroxide is 0.5 to 1.0 g/L.
The invention has the beneficial effects that:
1. the method adopts a mode of one bath and two steps, the discharge amount of the sewage of the bleaching process cannot be increased, the sodium borohydride and thiourea dioxide are adopted for reduction bleaching in the first step, and since the thiourea dioxide has certain acidity, sodium hydroxide is added in a proper amount during bleaching, so that the pH value of the bleaching solution is kept at 6.0-7.0, the reduction bleaching has good destructiveness on lignin and lignin pigment of the maple, the conjugate system of the pigment is easy to destroy, sulfonate is formed, the water solubility is good, the removal is easy, and the use amount of hydrogen peroxide in the second step is reduced;
2. the second step of the invention adopts an oxygen bleaching and whitening process, hydrogen peroxide, a hydrogen peroxide low-temperature activator, namely the cyclic adipic acid dihydrazide and a whitening agent 4BK are used for bleaching and whitening at a low temperature of 65 ℃ in one bath, the hydrogen peroxide low-temperature activator, namely the cyclic adipic acid dihydrazide, can reduce the bleaching and activation energy of the hydrogen peroxide, increase the effective decomposition of the hydrogen peroxide, only further decompose and destroy some residual pigments, and has small damage to other effective components, namely cellulose and hemicellulose, of the wood bark of the sparrow's eyes, so that the natural texture and the definition of the bleached wood bark of the sparrow's eyes are kept very good, the consumption of the used hydrogen peroxide is greatly reduced, and chemicals such as hydrogen peroxide stabilizers and chelating dispersants are not required to be added to help the stable decomposition of the hydrogen peroxide;
3. the invention adopts a hydrogen peroxide bleaching activator, namely the annular adipic acid dihydrazide, can have a low-temperature activation technology for hydrogen peroxide, can protect the effective decomposition of the hydrogen peroxide at the low temperature of 65 ℃, can prevent the excessive oxidation of the surface of the hippophae rhamnoides bark, generates oxidized cellulose, makes the grain of the hippophae rhamnoides bark become fuzzy, and can protect the hippophae rhamnoides bark from yellowing again when being dried;
4. the novel bleaching and whitening technology of the single-bath two-step method of the invention can improve the whiteness of bleached wood bark, the whiteness is improved by more than 20 percent compared with the whiteness of the bleached wood bark by the traditional method, and the bleached wood bark is more suitable for dyeing light color and bright color; after the bleaching of the maple wood bark with the peacock eyes by a one-bath two-step method, the appearance quality of the wood bark is more beautiful, the natural texture and the peacock eyes are clearer, the dried wood bark is stable in size and not easy to deform, and the quality grade of a product is improved by one grade;
5. the novel bleaching and whitening technology for the wood bark of the maidenhair maple is a one-bath two-step method, no new working procedure is added, a reducing agent is adopted to carry out reduction treatment for 2 hours at 60 ℃ under a neutral condition in the first step, most of pigments of lignin and lignin are removed, then hydrogen peroxide, hydrogen peroxide low-temperature activating agents such as annular adipic dihydrazide and a whitening agent 4BK are added, and low-temperature treatment is carried out for 3 hours at 65 ℃ under the condition of weak base pH8-9, the bleaching temperature of the maidenhair maple treated by the novel bleaching and whitening one-bath technology is reduced by 10-20 ℃, the bleaching time is saved by about 1-2 hours, the bleaching whiteness is improved by 20%, the definition of wood bark grains and the clarity of the maidenhair are greatly improved compared with that of a traditional bleaching method, the glossiness is increased, and finally.
Detailed Description
The following further illustrates embodiments of the invention:
example 1
The embodiment provides a bleaching method of a sparrow-eye maple bark, which comprises the following steps:
s1), first bleaching
S101), reduction bleaching formula
S102), bleaching process
The method comprises the steps of putting the sparrow-eye maple wood bark into a 1000ml wood bark bleaching frame, adding 0.5g of sodium hydroxide into water, adding 0.5g of sodium borohydride into a small container, stirring uniformly and completely dissolving, then injecting the wood bark bleaching frame, then injecting 2.0g of thiourea dioxide into the wood bark bleaching frame, stirring uniformly, adding a large amount of bubbles when the wood bark bleaching frame is just opened, reacting violently, slowly heating to 60 ℃, and keeping the temperature for 2 hours.
S2), second bleaching
S201), oxidizing and bleaching formula
S202) bleaching process
Adding 5g of cyclic adipic dihydrazide into a small container, injecting the mixture into hot water at 60 ℃ for dissolution, stirring the mixture for dissolution, injecting the mixture into a veneer bleaching frame, then slowly injecting 15g of hydrogen peroxide and 4g of brightener, adding 0.5g of sodium hydroxide to control the pH value to be about 8-9, and keeping the temperature at 65 ℃ for 3 hours. Then dehydrating and drying.
Example 2
The embodiment provides a bleaching method of a sparrow-eye maple bark, which comprises the following steps:
s1), first bleaching
S101), reduction bleaching formula
S102), bleaching process
The method comprises the steps of putting the sparrow-eye maple wood bark into a 1000ml wood bark bleaching frame, adding 0.75g of sodium hydroxide into water, adding 1.25g of sodium borohydride into a small container, stirring uniformly and completely dissolving, then injecting the wood bark bleaching frame, then injecting 5g of thiourea dioxide into the wood bark bleaching frame, stirring uniformly, adding a large amount of bubbles when the wood bark bleaching frame is just opened, reacting violently, slowly heating to 60 ℃, and keeping the temperature for 2 hours.
S2), second bleaching
S201), oxidizing and bleaching formula
S202) bleaching process
Adding 7.5g of cyclic adipic dihydrazide into a small container, injecting the mixture into hot water at 60 ℃ for dissolution, stirring the mixture for dissolution, injecting the mixture into a veneer bleaching frame, then slowly injecting 22.5g of hydrogen peroxide and 5g of a brightener 4BK, adding 0.75g of sodium hydroxide to control the pH value to be about 8-9, and keeping the temperature at 65 ℃ for 3 hours. Then dehydrating and drying.
Example 3
The embodiment provides a bleaching method of a sparrow-eye maple bark, which comprises the following steps:
s1), first bleaching
S101), reduction bleaching formula
S102), bleaching process
The method comprises the steps of putting the sparrow-eye maple wood bark into a 1000ml wood bark bleaching frame, adding 1g of sodium hydroxide into water, adding 2g of sodium borohydride into a small container, stirring uniformly and completely dissolving, then injecting the wood bark bleaching frame, then injecting 8g of thiourea dioxide into the wood bark bleaching frame, stirring uniformly, adding a large amount of bubbles when the wood bark bleaching frame is just opened, reacting violently, slowly heating to 60 ℃, and keeping the temperature for 2 hours.
S2), second bleaching
S201), oxidizing and bleaching formula
S202) bleaching process
Adding 10g of cyclic adipic dihydrazide into a small container, injecting the mixture into hot water at 60 ℃ for dissolution, stirring the mixture for dissolution, injecting the mixture into a veneer bleaching frame, then slowly injecting 30g of hydrogen peroxide and 6g of a brightener, adding 1.0g of sodium hydroxide to control the pH value to be about 8-9, and keeping the temperature at 65 ℃ for 3 hours. Then dehydrating and drying.
Example 4
Testing
Traditional bleaching process
In order to compare with the examples, the traditional process adopts the usage of hydrogen peroxide of 100g/L, sodium hydroxide of 40g/L, brightener 4BK of 6g/L, bleaching temperature of 85 ℃ and bleaching time of 8 hours.
And (3) comparing test effects:
and (3) wood veneer whiteness: measured by a whiteness instrument ZB-B type whiteness, expressed by a whiteness index
And (3) sewage COD test: determination of national standard GB11914-89 chemical oxygen demand
Wood veneer appearance: visual inspection to see the texture and sparrow eye cleaning degree.
The test results are shown in Table 1
TABLE 1 comparison of the results of two different bleaching processes
| Bleaching technical mode of sparrow-eye maple | Sewage COD (mg/l) | Index of whiteness | Bleached veneer appearance |
| Traditional bleaching process | 964 | 62 | Natural texture and sparrow eye paste |
| Example 1 | 721 | 77 | Natural texture and clear sparrow eyes |
| Example 2 | 724 | 80 | Natural texture and clear sparrow eyes |
| Example 3 | 732 | 88 | Natural texture and clear sparrow eyes |
As can be seen from the test results in Table 1, the COD discharged by the conventional bleaching process is 964ppm, and the COD is reduced by adopting the bleaching techniques of examples 1,2 and 3, and the COD is between 721 and 732 ppm. The whiteness indexes of examples 1,2 and 3 are improved to 20-37.5% compared with the traditional bleaching process, and example 3 has the best whiteness, so that later-stage dyeing is facilitated. The appearance of bleached maple wood bark was assessed directly by visual inspection, using examples 1,2, 3, the natural texture and the clarity of the peacock eyes were better than those of the traditional bleaching process.
The bleaching and whitening technology of the invention has the principle that one bath is carried out in two steps, and the discharge amount of the sewage in the bleaching process is not increased. Sodium borohydride and thiourea dioxide are adopted for reduction bleaching in the first step, and since the thiourea dioxide has certain acidity, sodium hydroxide is added in a proper amount during bleaching, so that the pH of bleaching liquid is kept at 6.0-7.0, the reduction bleaching has good destructiveness on lignin and lignin pigments of the maple, the conjugated system of the pigments is easy to damage, sulfonate is formed, the water solubility is good, the lignin and the lignin pigments are easy to remove, and the using amount of hydrogen peroxide in the second step is reduced. The second step adopts an oxygen bleaching and whitening process, hydrogen peroxide, a hydrogen peroxide low-temperature activator, namely the cyclic adipic acid dihydrazide and the whitening agent 4BK are used for bleaching and whitening at 65 ℃ at the same time, the hydrogen peroxide low-temperature activator, namely the cyclic adipic acid dihydrazide, can reduce the bleaching activation energy of the hydrogen peroxide, increase the effective decomposition of the hydrogen peroxide, only further decompose and destroy some residual pigments, and have small damage to other effective components, namely cellulose and hemicellulose, of the wood bark of the sparrow eye, so that the natural texture and the definition of the bleached wood bark of the sparrow eye are kept very good, the consumption of the used hydrogen peroxide is greatly reduced, and chemicals such as hydrogen peroxide stabilizers and chelating dispersants do not need to be added to help the stable decomposition of the hydrogen peroxide, the hydrogen peroxide is fully utilized, and the. The adoption of the hydrogen peroxide bleaching activator, namely the annular adipic acid dihydrazide, has the advantages of having a low-temperature activation technology for hydrogen peroxide, protecting the effective decomposition of the hydrogen peroxide at the low temperature of 65 ℃, and preventing the excessive oxidation of the surface of the wood bark of the hippophae rhamnoides from generating oxidized cellulose, so that the grain of the wood bark of the hippophae rhamnoides becomes fuzzy. And can protect the yellow of the maple wood skin again when the maple wood skin is dried.
Compared with the traditional bleaching technology, the novel bleaching and whitening technology for the maple wood bark with one-bath two-step method has the main innovation points that the traditional bleaching technology has quite large chemical consumption, long time, low efficiency and high COD (chemical oxygen demand) of sewage; the novel bleaching and whitening technology for the maple wood bark with the peacock eyes by a one-bath two-step method can improve the whiteness after bleaching, the whiteness is improved by 20 percent compared with the whiteness of the traditional method, and the wood bark bleached by the novel technology is more suitable for dyeing light color and bright color; after the bleaching of the maple wood bark with the peacock eyes by a one-bath two-step method, the appearance quality of the wood bark is more beautiful, the natural textures and the peacock eyes are clearer, the dried wood bark is stable in size and not easy to deform, and the quality grade of a product is improved by one grade. The novel bleaching and whitening technology for the maple wood bark by the one-bath two-step method does not need to add new equipment, can continue to use the traditional bleaching equipment, and does not need to modify the equipment.
The foregoing embodiments and description have been presented only to illustrate the principles and preferred embodiments of the invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention as hereinafter claimed.
Claims (7)
1. The bleaching method of the maple wood bark with the peacock eyes is characterized by comprising the following steps:
s1), the first bleaching,
loading the maple wood bark into a bark bleaching frame, adding a certain amount of sodium hydroxide, stirring and dissolving a certain amount of sodium borohydride, injecting into the bark bleaching frame, injecting a certain amount of thiourea dioxide into the bark bleaching frame, stirring uniformly, adding a large amount of bubbles when the frame is just opened, reacting violently, slowly heating to 50-60 ℃, and preserving heat for 2-3 hours;
s2), second bleaching
Stirring and dissolving a certain amount of the cyclic adipic acid dihydrazide with hot water at 50-65 ℃, injecting the solution into the veneer bleaching frame in the step S1), then slowly injecting a certain amount of hydrogen peroxide, sodium hydroxide and a whitening agent 4BK, keeping the temperature at 50-65 ℃ for 1-5 hours, and then dehydrating and drying.
2. The bleaching method of the maple wood bark of claim 1, further comprising: in the step S1), the mass ratio of thiourea dioxide to sodium borohydride is 4: 1.
3. The bleaching method of the maple wood bark of claim 2, further comprising: the pH of the reaction system in the step S1) is 6.0 to 7.0.
4. The bleaching method of the maple wood bark of claim 3, further comprising: the bath ratio of the reaction system in step S1) was 1: 10.
5. The bleaching method of the maple wood bark of claim 4, further comprising: in the step S1), the amount of the sodium borohydride is 0.5-2.0g/L, the amount of the thiourea dioxide is 2.0-8.0g/L, and the amount of the sodium hydroxide is 0.5-1.0 g/L.
6. The bleaching method of the maple wood bark of claim 1, further comprising: the pH of the reaction system of step S2) is 8 to 9.
7. The bleaching method of the maple wood bark of claim 1, further comprising: in the step S2), the amount of hydrogen peroxide is 15.0-30g/L, the amount of the cyclic adipic acid dihydrazide (hydrogen peroxide activator) is 5-10g/L, the amount of the brightener 4BK is 4-6g/L, and the amount of the sodium hydroxide is 0.5-1.0 g/L.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101121278A (en) * | 2007-08-31 | 2008-02-13 | 成都川雅木业有限公司 | Wood surface bleaching technology and its special-purpose apparatus |
| CN102926186A (en) * | 2012-10-12 | 2013-02-13 | 濮阳宏业汇龙化工有限公司 | Powerful reduced powder |
| CN105799026A (en) * | 2016-06-01 | 2016-07-27 | 嘉善久顺木业有限公司 | Wood veneer/batten whitening technology |
| CN106272792A (en) * | 2016-08-05 | 2017-01-04 | 沭阳县旺强木制品有限公司 | A kind of formula modified for wood powder |
| CN109403011A (en) * | 2018-10-24 | 2019-03-01 | 江苏华东纺织产品检测有限公司 | A kind of hydrogen peroxide bleaching treatment process of wool fiber |
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2020
- 2020-11-16 CN CN202011276017.1A patent/CN112297168B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101121278A (en) * | 2007-08-31 | 2008-02-13 | 成都川雅木业有限公司 | Wood surface bleaching technology and its special-purpose apparatus |
| CN102926186A (en) * | 2012-10-12 | 2013-02-13 | 濮阳宏业汇龙化工有限公司 | Powerful reduced powder |
| CN105799026A (en) * | 2016-06-01 | 2016-07-27 | 嘉善久顺木业有限公司 | Wood veneer/batten whitening technology |
| CN106272792A (en) * | 2016-08-05 | 2017-01-04 | 沭阳县旺强木制品有限公司 | A kind of formula modified for wood powder |
| CN109403011A (en) * | 2018-10-24 | 2019-03-01 | 江苏华东纺织产品检测有限公司 | A kind of hydrogen peroxide bleaching treatment process of wool fiber |
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