Preparation method of phase change energy storage transparent wood

Abstract

The application discloses a preparation method of phase change energy storage transparent wood, and the phase change energy storage transparent wood is prepared through ultraviolet light curing technology, the material has the advantages of rapid curing forming and low cost production, the material has good heat regulating performance, can maintain transparency, and enriches the aesthetic performance of building materials. The transparent wood is prepared by removing lignin in wood and filling phase change materials, so that the wood has super high transparency, the transparent wood is endowed with heat storage and energy storage capacity, the preparation efficiency is greatly improved compared with traditional technologies, and a key breakthrough is realized for the phase change energy storage transparent wood from laboratory to industrial application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wood processing, in particular to a preparation method of phase change energy storage transparent wood. BACKGROUND

[0002] At present, phase change materials are used to improve the energy efficiency of buildings because they can absorb and release heat within a specific temperature range. However, traditional phase change energy storage materials have good heat storage and temperature regulation capabilities, but they generally have problems such as complex processing, long curing time, high cost, and difficulty in achieving transparency, which limits their application in building materials. Phase change energy storage transparent wood has become a promising material for sustainable buildings due to its unique aesthetics, structure, and light transmission properties. However, the current preparation of phase change energy storage transparent wood requires a very long time and costs much higher than its application value, making it impossible to be industrialized and applied, which is a key problem to be solved. SUMMARY

[0003] The purpose of the present application is to provide a preparation method of phase change energy storage transparent wood. The present application can make the wood have transparent properties and also have excellent phase change energy storage effect, with the advantages of fast curing forming and low cost generation.

[0004] The technical solution of the present application is a preparation method of phase change energy storage transparent wood, comprising the following steps:

[0005] Step 1, preparation of phase change composite material: heat polyethylene glycol to its complete melting, add bisphenol A epoxy acrylate, triallyl isocyanurate, 2-hydroxy-2-methyl-1-phenyl-1-propanone and 2,4,6-trimethyl benzoyl diphenyl phosphate and stir to mix;

[0006] Among them, the mass proportion of polyethylene glycol in the total composite material is 30%-80%; the proportion of bisphenol A epoxy acrylate to triallyl isocyanurate is 2.5-3.5:1.8-2.3; the mass of 2-hydroxy-2-methyl-1-phenyl-1-propanone is 3-8% of the total weight of bisphenol A epoxy acrylate and triallyl isocyanurate; 2,4,6-trimethyl benzoyl diphenyl phosphate is 0.5-2% of the total weight of bisphenol A epoxy acrylate and triallyl isocyanurate;

[0007] Step 2, preparation of phase change energy storage transparent wood: immerse the delignified wood template in the composite phase change material, take out the wood template after immersion and irradiate it under ultraviolet light for 8-12 seconds to obtain the finished product.

[0008] The above-mentioned preparation method of phase change energy storage transparent wood, the proportion of bisphenol A epoxy acrylate to triallyl isocyanurate is 3:2.

[0009] The preparation method of the phase change energy storage transparent wood, the mass of the 2-hydroxy-2-methyl-1-phenyl-1-propanone is 5% of the total weight of the bisphenol A epoxy acrylate and the triallyl isocyanurate.

[0010] The preparation method of the phase change energy storage transparent wood, the 2,4,6-trimethylbenzoyl diphenyl phosphate is 1% of the total weight of the bisphenol A epoxy acrylate and the triallyl isocyanurate.

[0011] The preparation method of the phase change energy storage transparent wood, the preparation of the wood template after delignification is to configure a sodium chlorite solution with a mass concentration of 3-6%, adjust the pH to 4-5, then immerse the wood chips in the delignification solution, and boil until the wood chips are completely whitened; then wash the wood chips with deionized water to remove the residual solution of the wood chips, immerse the wood chips in anhydrous ethanol to replace the residual solution in the wood chips with anhydrous ethanol, and finally immerse the wood chips in acetone to replace the anhydrous ethanol in the wood chips with acetone, to obtain the wood template after delignification.

[0012] The preparation method of the phase change energy storage transparent wood, the mass concentration of the sodium chlorite solution is 4.5%, and the pH value is adjusted with glacial acetic acid.

[0013] The preparation method of the phase change energy storage transparent wood, the immersion is to immerse the wood template after delignification in the composite phase change material, keep for 30 min under normal pressure, then keep for 10 min under vacuum, then release the pressure, and repeat the cycle for 3 times.

[0014] The preparation method of the phase change energy storage transparent wood, after immersion, the wood template is taken out and irradiated under ultraviolet light for 10 seconds.

[0015] The preparation method of the phase change energy storage transparent wood, the wavelength of the ultraviolet light is 365 nm.

[0016] The preparation method of the phase change energy storage transparent wood, the stirring and mixing in step 1 is carried out in a water bath at 80°C, using a mechanical stirrer at a speed of 500 rad / min for 30 min.

[0017] Compared with the prior art, the present application provides a phase change energy storage transparent wood prepared by ultraviolet light curing technology, which has fast curing forming and low cost production, and has not only good thermal regulation performance, but also can maintain transparency, and enriches the aesthetic performance of building materials. The transparent wood is prepared by removing lignin in the wood and filling phase change material, so that the wood not only has ultra-high transparency, but also endows the transparent wood with the ability of heat storage and energy storage, and the preparation efficiency is greatly improved compared with the traditional technology, and a key breakthrough of the phase change energy storage transparent wood from laboratory to industrial application is realized. In the preparation of the phase change composite material, the curing speed is considered, and therefore bisphenol A epoxy acrylate and triallyl isocyanurate are selected as additives of the phase change composite material, the bisphenol A epoxy acrylate is a bifunctional oligomer, and the triallyl isocyanurate is a multifunctional monomer, and enough energy can be provided in a very short time by ultraviolet light to excite the initiator in the monomer to generate free radicals, so as to start the polymerization reaction, and then the curing speed is greatly accelerated by the multifunctional groups, and the purpose of fast curing forming is realized. In addition, the present application further optimizes the parameter ratio to make the effect best. The phase change energy storage transparent wood of the present application can be used for designing and developing new wood home products, intelligent windows, glass curtain walls and the like which can intelligently regulate temperature, store heat and save energy, and has important significance for developing low-carbon energy-saving building materials and promoting the transformation and upgrading of the wood industry. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a physical map of the phase change energy storage transparent wood (PCMTW) in the embodiment of the present application.

[0019] Figure 2 is a DSC exothermic performance (DSC) graph of the phase change energy storage transparent wood (PCMTW) in the embodiments 2, 3 and 4 of the present application.

[0020] Figure 3 is a DSC endothermic performance (DSC) graph of the phase change energy storage transparent wood (PCMTW) in the embodiments 2, 3 and 4 of the present application.

[0021] Figure 4 is a transmittance analysis graph of the phase change energy storage transparent wood (PCMTW) in the embodiments 2, 3 and 4 of the present application at 60 DEG C.

[0022] Figure 5 is a transmittance analysis graph of the phase change energy storage transparent wood (PCMTW) in the embodiments 2, 3 and 4 of the present application at 25 DEG C. DETAILED DESCRIPTION

[0023] The present application will be further described below in combination with the drawings and embodiments, but is not as the basis for limiting the present application.

[0024] Embodiment 1: A preparation method of phase change energy storage transparent wood, comprising the following steps:

[0025] Step 1, 55g of polyethylene glycol 2000 is heated to 60℃ to completely melt, 12g of bisphenol A epoxy acrylate, 8g of triallyl isocyanurate, 1g of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 0.2g of 2,4,6-trimethylbenzoyl diphenyl phosphate are added, and then placed in a 80℃ water bath, and stirred for 30min using a mechanical stirrer at a speed of 500rad / min.

[0026] Step 2, preparation of phase change energy storage transparent wood: the delignified wood template (size 40x20x1.5mm) is immersed in the composite phase change material, and after immersion, the wood template is taken out and irradiated under ultraviolet light for 8-12 seconds to obtain the finished product. The finished product is tested at 25℃ and 60℃, and the results are shown in Figure 1 Figure 1 The phase change energy storage transparent wood in the above embodiment is abbreviated as PCMTW, and it can be seen that the finished product has good transparency.

[0027] Embodiment 2: A preparation method of phase change energy storage transparent wood, comprising the following steps:

[0028] Step 1, preparation of delignification solution: a 4.5% sodium chlorite solution is prepared, and glacial acetic acid is added to adjust the pH to 4.6;

[0029] Step 2, preparation of wood template: a 40x20x1.5mm balsa wood sheet is prepared, then the wood sheet is immersed in the solution prepared in step 1, boiled until the wood sheet is completely white, then the wood sheet is washed with deionized water to remove the residual solution of the wood sheet, then the wood sheet is immersed in anhydrous ethanol to replace the residual solution in the wood sheet, and finally the wood sheet is immersed in acetone to replace the anhydrous ethanol in the wood sheet.

[0030] Step 3, preparation of phase change composite material: 30g of polyethylene glycol 2000 is heated to 60℃ to completely melt, 12g of bisphenol A epoxy acrylate, 8g of triallyl isocyanurate, 1g of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 0.2g of 2,4,6-trimethylbenzoyl diphenyl phosphate are added, and then placed in a 80℃ water bath, and stirred for 30min using a mechanical stirrer at a speed of 500rad / min.

[0031] ​Step 4, preparation of the phase change energy storage transparent wood: the wood piece prepared in step 2 is immersed in the composite phase change material prepared in step 3, kept under normal pressure for 30 min, then kept under vacuum for 10 min, then the pressure is released, and the cycle is repeated for 3 times, so that the phase change composite material in step 3 is sufficiently impregnated in the wood template, then the wood template is taken out, clamped between two glass plates, and irradiated under ultraviolet light with a wavelength of 365 nm for 10 seconds to obtain the phase change energy storage transparent wood.

[0032] Example 3: a preparation method of a phase change energy storage transparent wood, comprising the following steps:

[0033] Step 1, preparation of a delignification solution: a sodium chlorite solution with a concentration of 4.5% is configured, and glacial acetic acid is added to adjust the pH to 4.6.

[0034] Step 2, preparation of a wood template: a balsa wood sheet with a size of 40x20x1.5mm is prepared, then the wood piece is immersed in the solution prepared in step 1, boiled until the wood piece is completely white, then the wood piece is washed with deionized water to remove the residual solution of the wood piece, then the wood piece is immersed in anhydrous ethanol to replace the residual solution in the wood piece with anhydrous ethanol, and finally the wood piece is immersed in acetone to replace the anhydrous ethanol in the wood piece with acetone.

[0035] Step 3, preparation of a phase change composite material: 46.7g of polyethylene glycol 2000 is heated to 60℃ to completely melt, 12g of bisphenol A epoxy acrylate, 8g of triallyl isocyanurate, 1g of 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 0.2g of 2,4,6-trimethylbenzoyldiphenyl phosphine oxide are added, then placed in a 80℃ water bath, and stirred for 30 min at a speed of 500 rad / min using a mechanical stirrer.

[0036] Step 4, preparation of the phase change energy storage transparent wood: the wood piece prepared in step 2 is immersed in the composite phase change material prepared in step 3, kept under normal pressure for 30 min, then kept under vacuum for 10 min, then the pressure is released, and the cycle is repeated for 3 times, so that the phase change composite material in step 3 is sufficiently impregnated in the wood template, then the wood template is taken out, clamped between two glass plates, and irradiated under ultraviolet light with a wavelength of 365 nm for 10 seconds to obtain the phase change energy storage transparent wood.

[0037] Example 4: a preparation method of a phase change energy storage transparent wood, comprising the following steps:

[0038] Step 1, preparation of a delignification solution: a sodium chlorite solution with a concentration of 4.5% is configured, and glacial acetic acid is added to adjust the pH to 4.6.

[0039] Step 2, Preparation of wood template: Prepare 40x20x1.5mm balsa wood sheet, then immerse the wood sheet in the solution prepared in step 1, boil until the wood sheet is completely white, then wash the wood sheet with deionized water to remove the residual solution of the wood sheet, then immerse the wood sheet in anhydrous ethanol, replace the residual solution in the wood sheet with anhydrous ethanol, and finally immerse the wood sheet in acetone to replace the anhydrous ethanol in the wood sheet.

[0040] Step 3, Preparation of phase change composite material: Heat 80g of polyethylene glycol 2000 to 60℃ to completely melt it, add 12g of bisphenol A epoxy acrylate, 8g of triallyl isocyanurate, 1g of 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 0.2g of 2,4,6-trimethylbenzoyldiphenyl phosphine oxide, then place it in a 80℃ water bath, and use a mechanical stirrer to stir for 30min at a speed of 500rad / min.

[0041] Step 4, Preparation of phase change energy storage transparent wood: immerse the wood sheet prepared in step 2 in the composite phase change material prepared in step 3, keep it under normal pressure for 30min, then keep it under vacuum for 10min, then release the pressure, and repeat this cycle 3 times to ensure that the phase change composite material in step 3 is fully impregnated in the wood template, then take out the wood template and clamp it between two glass plates under ultraviolet light for 10 seconds to obtain the phase change energy storage transparent wood.

[0042] Example 5: A method for preparing a phase change energy storage transparent wood, comprising the following steps:

[0043] Step 1, Preparation of delignification solution: Prepare a 4.5% sodium chlorite solution. Add glacial acetic acid to adjust the pH to 4.6;

[0044] Step 2, Preparation of wood template: Prepare 40x20x1.5mm balsa wood sheet, then immerse the wood sheet in the solution prepared in step 1, boil until the wood sheet is completely white, then wash the wood sheet with deionized water to remove the residual solution of the wood sheet, then immerse the wood sheet in anhydrous ethanol, replace the residual solution in the wood sheet with anhydrous ethanol, and finally immerse the wood sheet in acetone to replace the anhydrous ethanol in the wood sheet.

[0045] Step 3, Preparation of phase change composite material: Heat 80g of polyethylene glycol 1000 to 60℃ to completely melt it, add 12g of bisphenol A epoxy acrylate, 8g of triallyl isocyanurate, 1g of 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 0.2g of 2,4,6-trimethylbenzoyldiphenyl phosphine oxide, then place it in a 80℃ water bath, and use a mechanical stirrer to stir for 30min at a speed of 500rad / min.

[0046] Step 4, preparation of the phase change energy storage transparent wood: the wood piece prepared in step 2 is immersed in the composite phase change material prepared in step 3, kept for 30 min under normal pressure, then kept for 10 min under vacuum, then the pressure is released, and the above process is repeated for 3 times, so that the phase change composite material in step 3 is sufficiently impregnated in the wood template. Then the wood template is taken out, clamped between two glass plates, and irradiated under ultraviolet light for 10 seconds to obtain the phase change energy storage transparent wood.

[0047] Example 6: a method for preparing a phase change energy storage transparent wood, comprising the following steps:

[0048] Step 1, preparation of the delignification solution: a 4.5% sodium chlorite solution is prepared, and glacial acetic acid is added to adjust the pH to 4.6.

[0049] Step 2, preparation of the wood template: a 40x20x1.5mm balsa wood sheet is prepared, then the wood piece is immersed in the solution prepared in step 1, boiled until the wood piece is completely white, then the wood piece is washed with deionized water to remove the residual solution, then the wood piece is immersed in anhydrous ethanol to replace the residual solution in the wood piece, and finally the wood piece is immersed in acetone to replace the anhydrous ethanol in the wood piece;

[0050] Step 3, preparation of the phase change composite material: 80g of polyethylene glycol 800 is heated to 60℃ to completely melt, then 12g of bisphenol A epoxy acrylate, 8g of triallyl isocyanurate, 1g of 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 0.2g of 2,4,6-trimethylbenzoyldiphenyl phosphine oxide are added, then the mixture is placed in a 80℃ water bath, and stirred for 30 min at a speed of 500 rad / min using a mechanical stirrer;

[0051] Step 4, preparation of the phase change energy storage transparent wood: the wood piece prepared in step 2 is immersed in the composite phase change material prepared in step 3, kept for 30 min under normal pressure, then kept for 10 min under vacuum, then the pressure is released, and the above process is repeated for 3 times, so that the phase change composite material in step 3 is sufficiently impregnated in the wood template. Then the wood template is taken out, clamped between two glass plates, and irradiated under ultraviolet light for 10 seconds to obtain the phase change energy storage transparent wood.

[0052] Further, the performance of the phase change energy storage transparent wood prepared in examples 2 to 4 is analyzed, Figure 2 is the DSC exothermic performance (DSC) diagram of the phase change energy storage transparent wood (PCMTW) in examples 2, 3, and 4 of the present application, from Figure 2 As can be seen from the above table, the heat flow of the phase change energy storage transparent wood prepared in the present application reaches 80J / g or more at room temperature, which proves that it has good exothermic capacity. Figure 3is a DSC endothermic performance (DSC) graph of the phase change energy storage transparent wood (PCMTW) in examples 2, 3, 4 of the present application. Figure 3 It can be seen from the above that the phase change energy storage transparent wood prepared by the present application has good heat storage capacity at high temperature. Figure 4 is a transmittance analysis graph of the phase change energy storage transparent wood (PCMTW) in examples 2, 3, 4 of the present application at 60℃. Figure 5 is a transmittance analysis graph of the phase change energy storage transparent wood (PCMTW) in examples 1, 2, 3 of the present application at 25℃. Figure 4 and Figure 5 It can be seen from the above that the transmittance can reach more than 60% in light with wavelength greater than 450 nm, and the transmittance can reach more than 80% at higher temperature. The above experimental results fully demonstrate that the phase change energy storage transparent wood prepared by the present application has good light transmission and energy storage effect.

[0053] In summary, the present application provides a phase change energy storage transparent wood prepared by ultraviolet curing technology, which has fast curing forming and low cost production, and not only has good heat regulating performance, but also can maintain transparency, enriching the aesthetic performance of building materials. The transparent wood removes lignin in wood and fills phase change material, so that the wood not only has ultra-high transparency, but also has heat storage and energy storage capacity, and the preparation efficiency is greatly improved compared with traditional technology, realizing the key breakthrough of phase change energy storage transparent wood from laboratory to industrial application. In the preparation of the phase change composite material, the curing speed is considered, so bisphenol A epoxy acrylate and triallyl isocyanurate are selected as additives of the phase change composite material. Bisphenol A epoxy acrylate is a bifunctional oligomer, and triallyl isocyanurate is a multifunctional monomer. The ultraviolet light can provide enough energy in a very short time to excite the initiator in the monomer to generate free radicals, thereby starting the polymerization reaction, and then the multifunctional group greatly accelerates the curing speed, realizing the purpose of fast curing forming. In addition, the present application further optimizes the parameter ratio to make the effect best. The phase change energy storage transparent wood of the present application can be used to design and develop new wood home products, intelligent windows, glass curtain walls, etc. which can intelligently regulate temperature, store heat and save energy, and has important significance for developing low-carbon energy-saving building materials and promoting the transformation and upgrading of the wood industry.

Claims

1. A method for preparing transparent wood for phase change energy storage, characterized in that: Includes the following steps: Step 1, Preparation of phase change composite material: Polyethylene glycol is heated until it is completely melted, and bisphenol A epoxy acrylate, triallyl isocyanurate, 2-hydroxy-2-methyl-1-phenyl-1-propanone and 2,4,6-trimethylbenzoyldiphenoxyphosphorus are added and stirred and mixed. In this composite material, polyethylene glycol accounts for 30%-80% of the total mass; the ratio of bisphenol A epoxy acrylate to triallyl isocyanurate is 2.5-3.5:1.8-2.3; the mass of 2-hydroxy-2-methyl-1-phenyl-1-propanone is 3-8% of the total weight of bisphenol A epoxy acrylate and triallyl isocyanurate; and 2,4,6-trimethylbenzoyl diphenoxyphosphorus accounts for 0.5-2% of the total weight of bisphenol A epoxy acrylate and triallyl isocyanurate. Step 2, Preparation of transparent wood for phase change energy storage: The delignified wood template is impregnated in the composite phase change material. After impregnation, the wood template is taken out and irradiated under ultraviolet light for 8-12 seconds to obtain the finished product.

2. The method for preparing phase change energy storage transparent wood according to claim 1, characterized in that: The ratio of bisphenol A epoxy acrylate to triallyl isocyanurate is 3:

2.

3. The method for preparing phase change energy storage transparent wood according to claim 1, characterized in that: The mass of the 2-hydroxy-2-methyl-1-phenyl-1-propanone is 5% of the total weight of bisphenol A epoxy acrylate and triallyl isocyanurate.

4. The method for preparing phase change energy storage transparent wood according to claim 1, characterized in that: The 2,4,6-trimethylbenzoyl diphenoxyphosphine is 1% of the total weight of bisphenol A epoxy acrylate and triallyl isocyanurate.

5. The method for preparing phase change energy storage transparent wood according to claim 1, characterized in that: The preparation of the delignified wood template involves preparing a 3-6% sodium chlorite solution, adjusting the pH to 4-5, then immersing the wood chips in the delignified solution and boiling them until they turn completely white. Next, the wood chips are washed with deionized water to remove any residual solution. The wood chips are then immersed in anhydrous ethanol to replace any remaining solution, and finally immersed in acetone to replace the anhydrous ethanol, thus obtaining the delignified wood template.

6. The method for preparing phase change energy storage transparent wood according to claim 5, characterized in that: The sodium chlorite solution has a mass concentration of 4.5%, and the pH value is adjusted using glacial acetic acid.

7. The method for preparing phase change energy storage transparent wood according to claim 1, characterized in that: The impregnation process involves first impregnating the delignified wood template in a composite phase change material, maintaining it under normal pressure for 30 minutes, then holding it under vacuum for 10 minutes, and finally releasing the pressure. This cycle is repeated three times.

8. The method for preparing phase change energy storage transparent wood according to claim 1, characterized in that: After soaking, remove the wooden template and place it under ultraviolet light for 10 seconds.

9. The method for preparing phase change energy storage transparent wood according to claim 1, characterized in that: The wavelength of the ultraviolet light is 365nm.

10. The method for preparing phase change energy storage transparent wood according to claim 1, characterized in that: The mixing in step 1 is carried out in an 80°C water bath using a mechanical stirrer for 30 minutes at a speed of 500 rad / min.

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