CN101817192A - Temperature-sensitive reversible color wooden material and manufacturing method thereof - Google Patents
Temperature-sensitive reversible color wooden material and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a temperature-sensitive reversible color wooden material and a manufacturing method thereof. The surface of the temperature-sensitive reversible color wooden material is provided with a temperature-sensitive reversible color functional layer; the functional layer is formed by dipping temperature colour-changing agent into the wooden material from the surface and remaining the agent in the pore of wooden material; the temperature-sensitive reversible color functional layer can be reversibly changed into another color from one color along with the change of temperature in a preset temperature zone. The wooden material of the invention can be used as wooden structure material and can be used as wooden facing material. The invention also discloses a special temperature colour-changing agent which mainly comprises procrypsis agent, colour-developing agent and solvent, wherein the procrypsis agent determines color change, the colour-developing agent determines color change shade, and the solvent determines color change temperature; the proportion of three ingredients is adjusted to control color, color change degree and color change temperature zone of temperature colour-changing wooden material.
Description
Technical field
The present invention relates to a kind of can be in the uniform temperature interval with variation of ambient temperature the wood materials of intelligent color-changing and manufacture method thereof.
Background technology
At present, people are when using wood materials, usually adopt the mode of brushing paint to obtain needed color, when people want to make material surface to present different colors, then need to remove original paint, recoat the paint of the color that refreshes, this not only time-consuming taking a lot of work, but also can cause damage to material surface.And if wood materials self can bring convenience not only for people's use according to people's needs turn colors, and will further enrich the function of wood materials, expand its application greatly.
Summary of the invention
The object of the present invention is to provide a kind of temperature-sensitive reversible color wooden material and manufacture method thereof.
For achieving the above object, the surface of temperature-sensitive reversible color wooden material of the present invention has the temperature-sensitive reversible color functional layer, this functional layer by by dipping with the temperature induced color changing agent from the wood materials surface to its inner immerse and be retained in the wood materials hole form, the temperature-sensitive reversible color functional layer can reversibly change to another kind of predetermined color from a kind of predetermined color with variation of temperature in predetermined temperature range.
The manufacture method of temperature-sensitive reversible color wooden material of the present invention is: by dipping the temperature induced color changing agent is immersed from the wood materials surface to its inside, and the temperature induced color changing agent that makes immersion is retained in the wood materials hole, thereby form to its inner temperature-sensitive reversible color functional layer of extending on the wood materials surface, obtain temperature-sensitive reversible color wooden material of the present invention thus.
Can soak in the temperature induced color changing agent under the situation of whole wood materials, whole material promptly forms whole temperature-sensitive reversible color wooden material; Do not soak in the temperature induced color changing agent under the situation of wood materials, then form thickness and the corresponding temperature-sensitive reversible color functional layer of temperature induced color changing agent immersion depth on the wood materials surface.
For the ease of the immersion of temperature induced color changing agent, before the dipping, can carry out preliminary treatment to wood materials, as microwave treatment, steam treatment, or the like, help like this to open in the wood materials and to hinder the passage that fluid flows, be convenient to the temperature induced color changing agent and be full of the hole in the wood materials and immerse to its deep inside; In addition, can also adopt ultrasonic immersing and vacuum impregnation, so more help the temperature induced color changing agent and be full of the hole in the wood materials and improve immersion depth.
For chemical stability and the useful life that improves temperature induced color changing agent in the wood materials, can apply clear dope by the wood product surface after impregnation process, the temperature induced color changing agent in the wood materials is isolated from the outside.
If before dipping, utilize the agent of other materials parcel temperature induced color changing, be made into size and satisfy the capsule that in the wood materials micropore, immerses, as Nano capsule, and then it is impregnated in the wood materials, not only improve the chemical stability and the useful life of temperature induced color changing agent, and use the later stage of convenient temperature induced color changing agent.
The matrix material that temperature-sensitive reversible color wooden material of the present invention both can be used as woodwork uses, and the finishing material that also can be used as woodwork uses.
Used temperature induced color changing agent is special-purpose temperature induced color changing agent in the temperature-sensitive reversible color wooden material of the present invention, this colour-changing agent mainly comprises procrypsis agent, developer and three kinds of compositions of solvent, wherein, the temperature of the depth of procrypsis agent decision change in color, developer decision change color, solvent decision variable color can realize the color of temperature induced color changing wood materials, the degree of change color and the control in discoloring temperature interval by the proportioning of adjusting between three kinds of compositions.
The procrypsis agent can select for use triarylmethane compound, Material of Fluoran, indoline phthalide-type, phenothiazines, spiral shell pyrrole to feed class, Schiff bases, volution class, two a kind of or wherein several mixing of fearing in the procrypsis agent such as ketone;
Developer is available phenolic hydroxyl group compound and derivative, carboxyl compound and a derivative thereof, and some can provide the lewis acid of proton, or the like;
Solvent can be selected a kind of or wherein several mixing in senior aliphatic ketone, alcohol, ester, ether, acid amides, the carboxylic acid compound equal solvent for use.
The special-purpose temperature induced color changing agent of the present invention in the preparation, at first get certain amount of solvent and put into the impregnation process jar, and be heated into liquid state, then by procrypsis agent, developer, solvent quality than 1: (0.1-30): (1-200) take by weighing procrypsis agent and developer and put into the impregnation process jar, fully stir, make procrypsis agent, developer, solvent even, promptly make the special-purpose temperature induced color changing agent of the present invention.
Except comprising procrypsis agent, developer and three kinds of main components of solvent, also can increase other auxiliary elements such as sensitizer, antioxidant, ultra-violet absorber in the special-purpose temperature induced color changing agent of the present invention; And, according to the discoloring temperature scope of final design temperature-sensitive reversible color wooden material, both can select to use a kind of solvent, also can select two kinds and the use of two or more solvent; Simultaneously,, both can select a kind of monochromatic procrypsis agent to use separately, and also can select the procrypsis agent of two kinds and two or more colors to mix and use according to the color of final design temperature-sensitive reversible color wooden material.
Temperature-sensitive reversible color wooden material of the present invention is compared with common wood materials, two new functions have been increased: intelligent color-changing and thermal power transfer function, be that temperature-sensitive reversible color wooden material can be in certain temperature range, with the thermal power transfer function of intelligence between its color generation intelligent color-changing function of variation of environment temperature and material itself and the surrounding environment.When environment temperature is higher than the initial discoloring temperature of temperature-sensitive reversible color wooden material, material can become another kind of color from a kind of color intelligence, material absorbed heat energy and was stored in material internal from environment this moment, and the heat energy total amount of storage equals material color before the variable color and becomes the required energy of color after the variable color; When environment temperature is lower than when stopping discoloring temperature, material becomes color before the variable color by the color intelligence after variable color, and material will be stored in inner energy and be discharged in the surrounding environment this moment, regulate the balance of environment temperature.
Temperature-sensitive reversible color wooden material of the present invention can realize from desired color to the wood materials true qualities, from the wood materials true qualities to desired color as required and a kind of desired color to the reversible variation the another kind of desired color; This material both can be used as the structural material of timber product, also can be used as the finishing material of timber product; Promptly can be used for indoor use, also can be used for outdoor application.When temperature-sensitive reversible color wooden material is used for when outdoor, discoloring temperature can be controlled in-40 ℃---between 80 ℃; When temperature-sensitive reversible color wooden material is used for when indoor, discoloring temperature can be controlled in 0 ℃---between 50 ℃.In addition, the discoloration of temperature-sensitive reversible color wooden material is stable, variable color sensitivity height, and dimensional stability is good.
Temperature-sensitive reversible color wooden material of the present invention can not only satisfy the instructions for use of consumer to normal wood material goods, other demands of consumer and value can also be provided, as: for people provide different color environment under different temperatures, regulate environment temperature by absorbing outside heat, the people that are transformed under different temperatures are separated out different functional areas in the environment around by color, and by color transformed for people provide eye-catching deixis, or the like.
Relevant product, research report and patent documentation are not seen in wood materials field at home and abroad at present.Therefore, the manufacture method of development temperature-sensitive reversible color wooden material, the exploitation temperature-sensitive reversible color wooden material is significant to the development and the products innovation of timber industry.Wood materials integral body of the present invention in addition or its surperficial functional layer have certain thickness, even if machine away the part skin-material during post-production, and under the situation about functional layer all not being removed, the colour change function of still remaining valid, therefore, made things convenient for the later stage of material to use.Material of the present invention will become new market vitality point of wood materials and timber industry new growth engines, be applied to high-end product especially, have huge market potential and prospect.
Description of drawings
Fig. 1 is the embodiment of the invention 1 effect contrast figure;
Fig. 2 is the embodiment of the invention 2 effect contrast figures;
Fig. 3 is the embodiment of the invention 3 effect contrast figures.
The specific embodiment
Embodiment 1
(1) wood materials is prepared
Both preliminary treatment can be carried out before the wood materials dipping, also impregnation process can be directly carried out.Wood materials is carried out preliminary treatment such as microwave, steam, helps to open and hinder the inaccessible passage of fluid in the timber internal flow, help the temperature induced color changing agent be full of in the wood materials microvoid and to wood materials inside deep bit transition more.
(2) temperature induced color changing agent preparation
Select for use crystal violet lactone as the procrypsis agent, bisphenol-A is as developer, and n-dodecanol is as solvent.At first getting a certain amount of lauryl alcohol adds in the impregnating autoclave, as 50kg, then by procrypsis agent, developer, solvent quality than 1: (0.1-30): (1-200) get crystal violet lactone and bisphenol-A and add impregnating autoclave, as crystal violet lactone 50kg, bisphenol-A 10kg, fully stir, three kinds of compositions are mixed, promptly make required temperature induced color changing agent.
(3) dipping of wood materials
To put into impregnating autoclave without pretreated wood materials, the control dipping temperature is 70 ℃, floods 4h, promptly finishes the dipping of wood materials.
(4) processing behind the wood materials dipping
From impregnating autoclave, take out the good wood materials of dipping, will promptly obtain temperature-sensitive reversible color wooden material shown in Figure 1 after the temperature induced color changing agent cleaning, drying attached to the wood materials surface with 50-100 ℃ clear water.
This wood materials can temperature be 17 ℃ blueness and temperature be 22 ℃ natural wood color between reversibly variable color, that is: temperature is when 17 ℃ rise to 22 ℃, the color of wood materials becomes natural wood color B by blue A gradually, otherwise, temperature is when 22 ℃ are reduced to 17 ℃, and the color of wood materials becomes blue A again by natural wood color B again gradually.
Above-mentioned technology is the basic impregnation process technology of wood materials, dipping temperature is controlled at 20-200 ℃ can obtains more satisfactory color changeable effect; And dip time is long more, and the degree of depth that the temperature induced color changing agent is invaded in the wood materials is dark more also abundant more, therefore, selects dip time according to the kind of impregnating depth that will reach and concrete wood materials usually, and this time roughly is being 30-240min.
The present application people is through studying discovery for a long period of time, in dipping, if in maceration extract, apply ultrasonic wave, the acoustic cavitation effect that ultrasonic wave produces can destroy the boundary layer of maceration extract and base material, improve the contact probability of maceration extract and base material, improve the diffusion velocity of maceration extract, reduce the concentration class of maceration extract, improve solubility, therefore, also can adopt ultrasonic wave impregnation process technology to above-mentioned wood materials, compare with above-mentioned basic impregnation technology, the ultrasonic wave dipping has energy-conservation, shorten dip time, improve temperature induced color changing agent utilization rate, advantage such as enhance productivity.
Can adopt the ultrasonic wave of common cleaning groove type to apply mode and ultrasonic device in the ultrasonic wave impregnation technology, parameters such as concrete ultrasonic power, dip time, dipping temperature, those skilled in the art then can obtain by simple experiment.Can in the 0-500W scope, select as ultrasonic power.
In addition, also can adopt the vacuum impregnation treatment process, that is: under the certain vacuum degree, wood materials be carried out impregnation process, like this, not only can accelerate the diffusion of temperature induced color changing agent in wood materials, but also can strengthen diffusion depth.Technological parameters such as the related vacuum of vacuum impregnation technique, dip time, dipping temperature, those skilled in the art can obtain by simple experiment on reference to basic immersion condition basis.As: vacuum can be in 0-5 * 10
4Select in the Pa scope, the range of choice of dip time and dipping temperature is respectively: 30-240min and 20-200 ℃.
On vacuum impregnation treatment process basis, can further develop out the vacuum pressed treatment process, that is: at first vacuumize, pressurize, and then pressurization, pressurize, each self-sustaining appropriate time of two processing steps is finished the impregnation process of wood materials, this processing mode, on the basis of vacuum impregnation effect, can further improve the diffusion depth of temperature induced color changing agent in wood materials, and help the micropore in the full fully wood materials of temperature induced color changing agent.The vacuum that vacuumizes can be in 0-5 * 10
4Select in the Pa scope, moulding pressure then can be selected in 0 to 5Mpa scope.
Embodiment 2
(1) wood materials is prepared
Treat the impreg material and carry out the steam preliminary treatment, 180 ℃ of vapor (steam) temperatures, processing time 10min.After the processing, be 8-12% with the drying of wood to moisture content.
(2) temperature induced color changing agent preparation
Select that temperature-sensitive is red, temperature-sensitive is yellow as the procrypsis agent for use, bisphenol-A is as developer, and positive hexadecanol is as the agent of solvent preparation temperature induced color changing.
(3) dipping of wood materials
Wood materials is carried out ultrasonic immersing handle 70 ℃ of dipping temperatures, dip time 3h, ultrasonic power 120W.
(4) processing behind the wood materials dipping
Promptly obtain temperature-sensitive reversible color wooden material shown in Figure 2 with the clean dipping back wood materials of 50-100 ℃ clear water and after being dried.
This temperature-sensitive reversible color wooden material can be that 26 ℃ orange-yellow and temperature is reversibly variable color between 32 ℃ the natural wood color in temperature, be temperature when 26 ℃ rise to 32 ℃, the color of wood materials becomes natural wood color B by orange-yellow A gradually, otherwise, temperature is when 32 ℃ are reduced to 26 ℃, and the color of wood materials changes back to orange-yellow A by natural wood color B again gradually.
Embodiment 3
(1) wood materials is prepared
The control moisture content is 20-40%, and utilizes microwave that timber is carried out preliminary treatment.Timber is carried out Microwave Pretreatment, and under the prerequisite of not destroying the timber self structure, passage that can mediation timber internal constraint fluid flow as much as possible improves length of penetration, osmotic evenness and the globality of temperature induced color changing agent on wood matrix.Microwave irradiation power density is controlled at 0.1-10w/cm3, radiation temperature to be controlled at 80 ℃-120 ℃, radiated time and to be controlled at 1-30min and can to obtain more satisfactory timber pickling effect.
(2) temperature induced color changing agent preparation
Select that temperature-sensitive is red, temperature-sensitive is green as the procrypsis agent for use, bisphenol-A is as developer, and positive tetradecyl alchohol is as the agent of solvent preparation temperature induced color changing.
(3) dipping of wood materials
Wood materials is carried out vacuum impregnation handle vacuum 2 * 10
4Pa, 70 ℃ of dipping temperatures, dip time 3h.
(4) processing behind the wood materials dipping
Promptly obtain temperature-sensitive reversible color wooden material shown in Figure 3 with the clean dipping back wood materials of 50-100 ℃ clear water and after being dried.
This temperature-sensitive reversible color wooden material can temperature be 31 ℃ peony and temperature be 37 ℃ natural wood color between reversibly variable color, be temperature when 31 ℃ rise to 37 ℃, the color of wood materials becomes natural wood color B by peony A gradually, otherwise, temperature is when 37 ℃ are reduced to 31 ℃, and the color of wood materials changes back to peony A by natural wood color B gradually.
Crystal violet lactone, temperature-sensitive used in the foregoing description is red, temperature-sensitive is yellow, temperature-sensitive is green is the agent of triarylmethane compound procrypsis, and in addition, the agent of triarylmethane compound procrypsis also has peacock green lactone, cresol red, or the like.In addition, also can select for use Material of Fluoran, indoline phthalide-type, phenothiazines, spiral shell pyrrole to feed class, Schiff bases, volution class, twoly fear cloudy toner such as ketone.
Developer is available phenolic hydroxyl group compound and derivative, carboxyl compound and a derivative thereof, and some can provide the lewis acid of proton etc., as bisphenol-A, benzyl p-hydroxybenzoate, caproic acid, sad, stearic acid, terephthalic acid (TPA) etc.
Solvent is available senior aliphatic ketone, alcohol, ester, ether, acid amides, carboxylic acid compound, n-dodecanol, positive tetradecyl alchohol, positive hexadecanol, positive 18 alcohol etc.
Claims (10)
1. temperature-sensitive reversible color wooden material, it is characterized in that, the surface of described temperature-sensitive reversible color wooden material has the temperature-sensitive reversible color functional layer, this functional layer by by dipping with the temperature induced color changing agent from the wood materials surface to its inner immerse and be retained in the wood materials hole form, the temperature-sensitive reversible color functional layer can reversibly change to another kind of predetermined color from a kind of predetermined color with variation of temperature in predetermined temperature range.
2. temperature-sensitive reversible color wooden material as claimed in claim 1 is characterized in that, described temperature-sensitive reversible color wooden material structurally its integral body all has colour change function.
3. temperature-sensitive reversible color wooden material as claimed in claim 1 is characterized in that, the controlled discoloring temperature interval of this temperature-sensitive reversible color wooden material is: be used for when outdoor ,-40 ℃-80 ℃, be used for when indoor 0 ℃-50 ℃.
4. the manufacture method of the described material of claim 1-3, it is characterized in that, by dipping the temperature induced color changing agent is immersed from the wood materials surface to its inside, and the temperature induced color changing agent that makes immersion is retained in the wood materials hole, thereby form to its inner temperature-sensitive reversible color functional layer of extending on the wood materials surface, obtain temperature-sensitive reversible color wooden material of the present invention thus.
5. manufacture method as claimed in claim 4 is characterized in that, can soak in the temperature induced color changing agent under the situation of whole wood materials, and whole material promptly forms whole temperature-sensitive reversible color wooden material; Do not soak in the temperature induced color changing agent under the situation of wood materials, then form thickness and the corresponding temperature-sensitive reversible color functional layer of temperature induced color changing agent immersion depth on the wood materials surface.
6. manufacture method as claimed in claim 4, it is characterized in that, before wood materials is carried out impregnation process, at first it is carried out Microwave Pretreatment or steam pre-treatment, hinder the passage that fluid flows to open in the wood materials, be convenient to the temperature induced color changing agent and be full of the hole in the wood materials and immerse to its deep inside; Described dipping is ultrasonic immersing or vacuum impregnation or vacuum pressed dipping.
7. manufacture method as claimed in claim 4, it is characterized in that, also comprise the subsequent treatment process after wood materials floods, be specially: utilize 50-100 ℃ clear water to clean attached to the temperature induced color changing agent on wood materials surface, to wash the back temperature-sensitive reversible color wooden material again and carry out the drying processing, obtain required temperature-sensitive reversible color wooden material.
8. used special-purpose temperature induced color changing agent in the described method of claim 4-7, it is characterized in that, this colour-changing agent mainly comprises procrypsis agent, developer and three kinds of compositions of solvent, wherein, the temperature of the depth of procrypsis agent decision change in color, developer decision change color, solvent decision variable color, and the proportioning of passing through to adjust between three kinds of compositions realizes the color of temperature induced color changing wood materials, the degree of change color and the control in discoloring temperature interval; The mass ratio of procrypsis agent, developer, three kinds of compositions of solvent is 1: (0.1-30): (1-200); The procrypsis agent is triarylmethane compound, Material of Fluoran, indoline phthalide-type, phenothiazines, spiral shell pyrrole food in one's mouth class, Schiff bases, volution class, two a kind of or wherein several mixing of fearing in the agent of ketone procrypsis; Developer maybe can provide the lewis acid of proton for phenolic hydroxyl group compound and derivative, carboxyl compound and derivative thereof; Solvent is a kind of or wherein several mixing in senior aliphatic ketone, alcohol, ester, ether, acid amides, the carboxylic acid compound solvent.
9. temperature induced color changing agent as claimed in claim 8 is characterized in that, also includes auxiliary element in the described temperature induced color changing agent: sensitizer and/or antioxidant and/or ultra-violet absorber.
10. the using method of the described wood materials of claim 1-3 is characterized in that, described temperature-sensitive reversible color wooden material both can be used as the structural material of wood materials goods, also can be used as the finishing material of wood materials goods; Both can be in outdoor application, also can be in indoor use; The matrix material that both can be used as woodwork uses, and the finishing material that also can be used as woodwork uses; After being processed into woodwork, the wood materials surface also is coated with the clear dope that the temperature induced color changing agent in the wood materials is isolated from the outside.
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| CN102345231A (en) * | 2011-07-13 | 2012-02-08 | 东华大学 | Silica nanoscale hybridized sol thermochromatic finishing method for fabric |
| CN102873726A (en) * | 2012-10-23 | 2013-01-16 | 东北林业大学 | Wood-base photochromic composite preparation method |
| CN102873725A (en) * | 2012-10-23 | 2013-01-16 | 东北林业大学 | Hydrophobic wood-base photochromic composite preparation method |
| CN102922578A (en) * | 2012-11-26 | 2013-02-13 | 昆山市大金机械设备厂 | Dyeing method for wooden parts |
| CN104369243A (en) * | 2014-12-12 | 2015-02-25 | 北京林业大学 | Ultrasonic-assisted wood veneer dyeing method |
| CN106182211A (en) * | 2016-07-06 | 2016-12-07 | 宜华生活科技股份有限公司 | A kind of preparation method of wood substrate reversible temperature induced color changing composite |
| CN106182283A (en) * | 2016-07-06 | 2016-12-07 | 东北林业大学 | A kind of preparation method of innovation wood substrate reversible temperature induced color changing composite |
| CN109971190A (en) * | 2019-03-18 | 2019-07-05 | 东南大学 | A kind of thermochromism pitch and preparation method thereof of the reversible regulation of temperature |
| CN110625721A (en) * | 2019-09-24 | 2019-12-31 | 浙江农林大学 | Preparation method of phase-change energy-storage wood |
| CN111098374A (en) * | 2019-12-13 | 2020-05-05 | 深圳共享网络科技发展有限公司 | Preparation method of reversible thermochromic functional wood |
| CN112564030A (en) * | 2020-11-25 | 2021-03-26 | 国网福建省电力有限公司大田县供电公司 | Reversible color-changing insulating heat shrinkable sleeve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102345231A (en) * | 2011-07-13 | 2012-02-08 | 东华大学 | Silica nanoscale hybridized sol thermochromatic finishing method for fabric |
| CN102345231B (en) * | 2011-07-13 | 2013-12-11 | 东华大学 | Silica nanoscale hybridized sol thermochromatic finishing method for fabric |
| CN102873726B (en) * | 2012-10-23 | 2014-07-02 | 东北林业大学 | Wood-base photochromic composite preparation method |
| CN102873726A (en) * | 2012-10-23 | 2013-01-16 | 东北林业大学 | Wood-base photochromic composite preparation method |
| CN102873725A (en) * | 2012-10-23 | 2013-01-16 | 东北林业大学 | Hydrophobic wood-base photochromic composite preparation method |
| CN102873725B (en) * | 2012-10-23 | 2014-07-02 | 东北林业大学 | Hydrophobic wood-base photochromic composite preparation method |
| CN102922578A (en) * | 2012-11-26 | 2013-02-13 | 昆山市大金机械设备厂 | Dyeing method for wooden parts |
| CN104369243A (en) * | 2014-12-12 | 2015-02-25 | 北京林业大学 | Ultrasonic-assisted wood veneer dyeing method |
| CN104369243B (en) * | 2014-12-12 | 2016-07-06 | 北京林业大学 | A kind of method of ultrasonic assistant wood veneer dyeing |
| CN106182211A (en) * | 2016-07-06 | 2016-12-07 | 宜华生活科技股份有限公司 | A kind of preparation method of wood substrate reversible temperature induced color changing composite |
| CN106182283A (en) * | 2016-07-06 | 2016-12-07 | 东北林业大学 | A kind of preparation method of innovation wood substrate reversible temperature induced color changing composite |
| CN109971190A (en) * | 2019-03-18 | 2019-07-05 | 东南大学 | A kind of thermochromism pitch and preparation method thereof of the reversible regulation of temperature |
| CN110625721A (en) * | 2019-09-24 | 2019-12-31 | 浙江农林大学 | Preparation method of phase-change energy-storage wood |
| CN111098374A (en) * | 2019-12-13 | 2020-05-05 | 深圳共享网络科技发展有限公司 | Preparation method of reversible thermochromic functional wood |
| CN112564030A (en) * | 2020-11-25 | 2021-03-26 | 国网福建省电力有限公司大田县供电公司 | Reversible color-changing insulating heat shrinkable sleeve |
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