CN114905588A - Transparent wood with editable shape and preparation method thereof - Google Patents
Transparent wood with editable shape and preparation method thereof Download PDFInfo
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- CN114905588A CN114905588A CN202210519447.4A CN202210519447A CN114905588A CN 114905588 A CN114905588 A CN 114905588A CN 202210519447 A CN202210519447 A CN 202210519447A CN 114905588 A CN114905588 A CN 114905588A
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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
- 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
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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
- 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
- B27K3/025—Controlling the process
-
- 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
- B27K3/16—Inorganic impregnating agents
- B27K3/20—Compounds of alkali metals or ammonium
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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
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/34—Organic impregnating agents
- B27K3/36—Aliphatic 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
- 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
- B27K5/0005—Cryogenic treatment
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- 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
- B27K2240/00—Purpose of the treatment
- B27K2240/15—Decontamination of previously treated wood
Abstract
The invention discloses a transparent wood with an editable shape and a preparation method thereof, wherein the preparation method comprises the following steps: step 1: soaking a wood sample in a delignification solution to prepare a delignification sample; step 2: preparing an impregnating resin solution, and mixing epoxy resin (E51) and trihydroxy methanePropanetris (3-mercaptopropionic acid) ester (Tri-SH) and catalyst (Sn (Oct) 2 ) Mixing and violently stirring to obtain an impregnating resin solution; and step 3: putting the delignified sample into an impregnating resin solution to prepare a sample immersed in resin, clamping the sample immersed in the resin between two polytetrafluoroethylene films and between two glass sheets, wrapping the sample with an aluminum foil, heating and curing the sample, taking out the sample, and cooling the sample to obtain the transparent wood with an editable shape. The invention ensures that the wood has certain light transmittance by performing delignification treatment on the wood and then impregnating functional resin and combining an in-situ polymerization process, and has the characteristics of shape memory, shape editing and the like.
Description
Technical Field
The invention belongs to the technical field of wood manufacturing and modification, and particularly relates to transparent wood with an editable shape and a preparation method thereof.
Background
With the increasing perfection of the transparent wood preparation technology, the research only aiming at the optical characteristics of the transparent wood is difficult to make breakthrough progress, and the related research on the functionalization of the transparent wood becomes a hot spot. At present, transparent wood has attracted great attention in the fields of light, heat, electromagnetism, energy management and the like, and functions related to fluorescence, luminescence, electrical conduction, magnetism, thermal storage, thermal shielding and the like are increasingly introduced into the research field of transparent wood. Shape memory materials are the most interesting class of smart materials. The intelligent characteristic of the cycle of original shape-temporary shape-shape recovery can be completed under the drive of external conditions (heat, chemical, mechanical, magnetic, electric and the like), and the intelligent characteristic is widely applied to the fields of textile industry, medical treatment and health, building packaging and the like. The transparent wood and the shape memory function are combined, so that the application range of the transparent wood is enriched, and the requirements of sustainable development and green development are met, because the wood has the characteristics of biodegradability and green environmental protection. How to realize the effective combination of the two, and the preparation of the transparent wood with the shape memory function becomes a problem which needs to be solved urgently.
Disclosure of Invention
The invention aims to provide a transparent wood with an editable shape and a preparation method thereof.
The technical scheme for realizing the purpose of the invention is as follows:
a method for preparing transparent wood with editable shape comprises the following steps:
step 1: soaking a wood sample in a delignification solution to prepare a delignification sample;
step 2: preparing an impregnating resin solution, and mixing epoxy resin (E51), trimethylolpropane Tri (3-mercaptopropionate) (Tri-SH) and a catalyst (Sn (Oct) 2 ) Mixing and violently stirring to obtain an impregnating resin solution;
and step 3: putting the delignified sample into an impregnating resin solution to prepare a sample immersed in resin, clamping the sample immersed in the resin between two polytetrafluoroethylene films and between two glass sheets, wrapping the sample with an aluminum foil, heating and curing the sample, taking out the sample, and cooling the sample to obtain the transparent wood with an editable shape.
Further, the step 1 specifically includes:
step 1.1: preparing a wood sample into a required specification size;
step 1.2: preparing a sodium hypochlorite solution with a preset mass fraction, adjusting the pH value of the solution to a preset value by using acetic acid to obtain a delignification solution, and soaking a wood sample in the delignification solution at 80 ℃ for several hours;
step 1.3: replacing the delignifying solution once every predetermined time;
step 1.4: washing the soaked wood sample with hot water;
step 1.5: the cleaned wood samples were freeze dried to obtain delignified samples.
Further, the thickness of the wood sample in step 1.1 is within 3 mm.
Further, the mass fraction of the sodium hypochlorite solution in the step 1.2 is 1%. The pH of the solution was adjusted to 4.6 using acetic acid and the length of time the wood sample was soaked in the delignifying solution was 12-24 h.
Further, the delignifying solution is replaced every 6 hours in the step 1.3, and the replacement times are 2-3 times.
Further, epoxy groups and mercapto groups in the impregnating resin solution in the step 2Molar ratio of clusters 1:1, Sn (Oct) 2 The molar ratio to thiol groups was 5%.
Further, the preparation of the resin-impregnated sample in step 3 specifically comprises: putting the delignified sample at the bottom of a beaker, pouring enough impregnating resin solution into the beaker to ensure that the liquid level of the impregnating resin solution obviously exceeds that of the delignified sample, then putting the beaker in a vacuum drying oven, vacuumizing for 30min, turning off a vacuum pump, and standing for 30-60min to obtain the sample immersed in the resin.
Further, an oven is adopted in the step 3 for heating and curing, wherein the oven temperature is 60-120 ℃, and the heating time is 10-12 h.
Further, the wood sample is a board of balsa wood.
A shape-editable transparent wood material is prepared by the method.
Compared with the prior art, the invention has the remarkable advantages that:
(1) the method comprises the steps of delignifying original wood, and soaking in resin solution with matched refractive index (the refractive index of the resin is constant, data can be checked, delignification of the wood is carried out to obtain a cellulose framework, and the refractive index of the cellulose is about 1.5, so that the refractive index of the cured resin can be about 1.5), so that the wood is transparent and has certain transmittance;
(2) the sample has the shape memory function under the thermal stimulation by dipping the polymer with the shape memory function;
(3) the original shape of the wood can be edited again automatically through high temperature;
(4) the transparent wood is combined with intelligent characteristics such as shape memory and shape editing, the application range of the transparent wood is effectively widened, and the transparent wood has good application prospect.
Drawings
Fig. 1 is a display view of the shape-editable transparent wood of the invention.
FIG. 2 is a schematic diagram of the editable shape memory of the shape-editable transparent wood according to the invention.
Detailed Description
A method for preparing transparent wood with editable shape comprises the following steps:
1) the wood samples were prepared to specification size with thickness strictly controlled within 3 mm.
2) Preparing a sodium hypochlorite solution with the mass fraction of 1%, adjusting the pH value of the solution to 4.6 by using acetic acid to obtain a delignification solution, and soaking a wood sample in the delignification solution at the temperature of 80 ℃ for hours.
3) The delignifying solution was replaced every 6 hours.
4) The treated sample was rinsed with hot water to remove residual chemicals (sodium hypochlorite and acetic acid) from the sample.
5) The washed samples were freeze dried to obtain delignified samples. (Wood is mainly composed of cellulose, hemicellulose and lignin, wherein the lignin contains chromophoric groups and color-assisting groups, which are main reasons for the color of wood.A lignin and hemicellulose components can be removed by delignification treatment to obtain a white cellulose skeleton, and then the white cellulose skeleton is impregnated with resin with matched refractive index to obtain transparent wood.)
6) And preparing an impregnating resin solution. Epoxy resin (E51) was mixed with trimethylolpropane tris (3-mercaptopropionate) (Tri-SH) and catalyst (Sn (Oct)2) and vigorously stirred. Ensuring that the molar ratio of the epoxy group to the mercapto group is equal, and the molar ratio of Sn (Oct)2 to the thiol group is 5%. (the epoxy group of the epoxy resin (E51) reacts with trimethylolpropane tris (3-mercaptopropionic acid) ester (Tri-SH) under the action of a catalyst (Sn (Oct)2) to generate a dynamic covalent bond which is stable at low temperature and undergoes an exchange reaction at high temperature, namely balanced fracture and generation behaviors, so that the cured resin has intelligent functions of temperature response, such as shape memory and the like.)
7) And placing the delignified sample at the bottom of the beaker, and pouring enough prepared impregnating resin solution into the beaker to ensure that the liquid level of the impregnating resin solution obviously exceeds that of the delignified sample.
8) The whole apparatus (beaker with impregnating resin solution and delignified sample) was placed in a vacuum oven and evacuated for 30 min. And (4) closing the vacuum pump, standing for a period of time, and completely impregnating the resin in the pore structure of the delignified wood.
9) The resin-impregnated sample was sandwiched between two sheets of teflon film and between two sheets of glass. And (3) putting the sample soaked in the resin in an aluminum foil wrapping device (a system in which the sample is wrapped in the polytetrafluoroethylene film, the glass sheet and the aluminum foil) in an oven for heating and curing.
10) And taking out the device and cooling to obtain the transparent wood with the shape editing function.
Preferably, the wood is a balsa board, and the lumber can be cross-cut or longitudinal-cut.
Preferably, the effect of the step 3) after sample treatment is as follows: the texture was uniform and nearly colorless.
Preferably, the standing time in the step 8) is 30-60min, so that the standing environment is a dry environment, and the influence of the environmental humidity is avoided.
Preferably, the temperature of the oven in the step 9) is 60-120 ℃, and the heating time is 10-12 h.
Fig. 1 is a diagram showing the shape-editable transparent wood of the present invention, and it can be seen that the transparent wood with the thickness of 1-3mm prepared by the method of the present invention has better transparency.
Fig. 2 is a schematic diagram showing an editable shape memory of the shape-editable transparent wood of the invention, and the shape-editable transparent wood is expected to be applied to some optical fields instead of curved glass and the like.
The transparent wood disclosed by the invention has good optical performance, cold-induced shape fixing, heat-induced shape recovery, programmable stimulus response performance and good cycle performance, and can widen the application field of the transparent wood in functional and intelligent transparent materials.
It is obvious that the embodiments described above are only some examples of the present invention, and not all embodiments. According to the above-mentioned disclosure, various changes and modifications can be made by workers without departing from the technical spirit of the present invention, including modification of the size of the heat exchanger structure and use of selected materials. The technical scope of the present invention is not limited to the content described in the specification, and must be determined according to the scope of claims in engineering practice.
Claims (10)
1. A method for preparing transparent wood with editable shape is characterized by comprising the following steps:
step 1: soaking a wood sample in a delignification solution to prepare a delignification sample;
step 2: preparing an impregnating resin solution, namely preparing epoxy resin (E51), trimethylolpropane Tri (3-mercaptopropionic acid) ester (Tri-SH) and a catalyst (Sn (Oct) 2 ) Mixing and violently stirring to obtain an impregnating resin solution;
and step 3: putting the delignified sample into an impregnating resin solution to prepare a sample immersed in resin, clamping the sample immersed in the resin between two polytetrafluoroethylene films and between two glass sheets, wrapping the sample with an aluminum foil, heating and curing the sample, taking out the sample, and cooling the sample to obtain the transparent wood with an editable shape.
2. The method for preparing a shape-editable transparent wood according to claim 1, wherein the step 1 specifically comprises the following steps:
step 1.1: preparing a wood sample into a required specification size;
step 1.2: preparing a sodium hypochlorite solution with a preset mass fraction, adjusting the pH value of the solution to a preset value by using acetic acid to obtain a delignification solution, and soaking a wood sample in the delignification solution at 80 ℃ for several hours;
step 1.3: replacing the delignifying solution once every predetermined time;
step 1.4: washing the soaked wood sample with hot water;
step 1.5: the cleaned wood samples were freeze dried to obtain delignified samples.
3. The method for preparing a shape-editable transparent wood according to claim 2, wherein the thickness of the wood sample in the step 1.1 is within 3 mm.
4. The method for preparing a shape-editable transparent wood according to claim 2, wherein the mass fraction of the sodium hypochlorite solution in the step 1.2 is 1%. The pH of the solution was adjusted to 4.6 using acetic acid and the length of time the wood sample was soaked in the delignifying solution was 12-24 h.
5. The method for preparing a shape-editable transparent wood according to claim 2, wherein the delignifying solution is replaced every 6 hours in the step 1.3, and the replacement times are 2-3 times.
6. The method for preparing shape-editable transparent wood according to any one of claims 1 to 5, wherein the molar ratio of the epoxy group to the mercapto group in the impregnating resin solution in the step 2 is 1:1, Sn (Oct) 2 The molar ratio to thiol groups was 5%.
7. The method for preparing a shape-editable transparent wood according to claim 6, wherein the sample impregnated with the resin prepared in step 3 is specifically: putting the delignified sample at the bottom of a beaker, pouring enough impregnating resin solution into the beaker to ensure that the liquid level of the impregnating resin solution obviously exceeds that of the delignified sample, then putting the beaker in a vacuum drying oven, vacuumizing for 30min, turning off a vacuum pump, and standing for 30-60min to obtain the sample immersed in the resin.
8. The method for preparing transparent wood with editable shape according to the claim 7, wherein the step 3 is carried out by heating and curing in an oven, the temperature of the oven is 60-120 ℃, and the heating time is 10-12 h.
9. The method for preparing a shape-editable transparent wood according to claim 5, wherein the wood sample is a plate of balsa wood.
10. A shape-editable transparent wood, characterized in that it is produced by the method according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210519447.4A CN114905588A (en) | 2022-05-13 | 2022-05-13 | Transparent wood with editable shape and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210519447.4A CN114905588A (en) | 2022-05-13 | 2022-05-13 | Transparent wood with editable shape and preparation method thereof |
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| Publication Number | Publication Date |
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| CN114905588A true CN114905588A (en) | 2022-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210519447.4A Pending CN114905588A (en) | 2022-05-13 | 2022-05-13 | Transparent wood with editable shape and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115958669A (en) * | 2022-12-13 | 2023-04-14 | 南京林业大学 | Preparation method of transparent luminous wood composite material |
| CN116604661A (en) * | 2023-05-25 | 2023-08-18 | 北京林业大学 | Shape and color synchronous double-response wood composite material under thermal stimulus, preparation method and application |
| CN116604661B (en) * | 2023-05-25 | 2024-04-26 | 北京林业大学 | Shape and color synchronous double-response wood composite material under thermal stimulus, preparation method and application |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105037702A (en) * | 2015-07-23 | 2015-11-11 | 浙江大学 | Application method of plasticity shape memory polymer based on ester exchange |
| CN108250412A (en) * | 2018-01-29 | 2018-07-06 | 哈尔滨工业大学 | A kind of shape memory polymer networks formation system of reversible curing lock based on disulfide bond and preparation method thereof |
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2022
- 2022-05-13 CN CN202210519447.4A patent/CN114905588A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105037702A (en) * | 2015-07-23 | 2015-11-11 | 浙江大学 | Application method of plasticity shape memory polymer based on ester exchange |
| CN108250412A (en) * | 2018-01-29 | 2018-07-06 | 哈尔滨工业大学 | A kind of shape memory polymer networks formation system of reversible curing lock based on disulfide bond and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| KAILI WANGA ET AL.: "Transparent wood developed by introducing epoxy vitrimers into a delignified wood template", 《COMPOSITES SCIENCE AND TECHNOLOGY》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115958669A (en) * | 2022-12-13 | 2023-04-14 | 南京林业大学 | Preparation method of transparent luminous wood composite material |
| CN116604661A (en) * | 2023-05-25 | 2023-08-18 | 北京林业大学 | Shape and color synchronous double-response wood composite material under thermal stimulus, preparation method and application |
| CN116604661B (en) * | 2023-05-25 | 2024-04-26 | 北京林业大学 | Shape and color synchronous double-response wood composite material under thermal stimulus, preparation method and application |
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