Photocurable dehumidifying material, and preparation method and application thereof

Abstract

The application discloses a photocuring dehumidification material and a preparation method and application thereof, and the preparation method comprises the following steps: uniformly mixing a photocuring resin, a photoinitiator, a dehumidification filler, a pore-forming agent and an active diluent to prepare a mixed slurry; loading the mixed slurry on a first glass fiber paper, pressing the first glass fiber paper into a corrugated shape after loading, and then performing photocuring to prepare a corrugated paper; loading the mixed slurry on a second glass fiber paper, performing photocuring after loading to prepare a flat paper, and then arranging a silica sol layer on the surface of the flat paper; alternately stacking the corrugated paper and the flat paper provided with the silica sol layer to prepare an intermediate body, and baking the intermediate body; and the material prepared by the method has the advantages of short preparation period, large bonding strength and good dehumidification effect, and has great application potential in the field of preparation of a dehumidification runner core.

Description

Technical Field

[0001] This invention relates to the field of gas dehumidification technology, specifically to a photocurable dehumidification material, its preparation method, and its application. Background Technology

[0002] With the development of technology, humidity control has become an increasingly important issue in industrial and agricultural fields. Furthermore, the improvement of people's living standards has also promoted the development of civilian dehumidification equipment. Rotary dehumidification technology has attracted much attention due to its numerous advantages, including large dehumidification capacity, good dehumidification effect and continuity, wide applicability, and independence from seasonal influences. As the core component of a rotary dehumidification system, the dehumidification wheel core's production technology has long been controlled by developed countries. While domestic research in this area has made some progress in the past two decades, most dehumidifiers manufactured in China still rely on imported wheel cores. Therefore, the development of domestically produced wheel cores remains a long and arduous task. Summary of the Invention

[0003] The purpose of this invention is to overcome one or more shortcomings in the prior art and provide a novel method for preparing a photocurable dehumidifier. The photocurable dehumidifier prepared by this method has the advantages of good strength, low powder shedding, simple process, and short preparation cycle.

[0004] The present invention also provides a novel photocurable dehumidifying material prepared by the above method.

[0005] This invention also provides an application of the novel photocurable dehumidifying material prepared by the above method in the preparation of a dehumidifying rotor.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] A method for preparing a photocurable dehumidifying material, the method comprising:

[0008] The photocurable resin, photoinitiator, dehumidifying filler, pore-forming agent, and reactive diluent are mixed to form a mixed slurry;

[0009] The first glass fiber paper is loaded with the mixed pulp, and after loading, it is pressed into a corrugated shape, and then cured by light to produce corrugated paper;

[0010] The mixed pulp is loaded onto a second glass fiber paper, and after loading, it is photocured to form a sheet paper. Then, a silica sol layer is deposited on the surface of the sheet paper.

[0011] An intermediate body is formed by alternately stacking the corrugated paper and the sheet paper with the silica sol layer; wherein the silica sol layer is used to bond the corrugated paper and the sheet paper.

[0012] The intermediate is then calcined.

[0013] In some embodiments of the present invention, the acrylic resin is one or more combinations selected from polyurethane acrylate, polyester acrylate or epoxy acrylate.

[0014] In some embodiments of the present invention, the active diluent is one or more of the following: hydroxyethyl methacrylate, hydroxypropyl methacrylate, isobornyl methacrylate, diethylene glycol diacrylate, 1,4-butanediol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, and pentaerythritol tetraacrylate.

[0015] In some embodiments of the present invention, the photoinitiator is one or more combinations selected from 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylphenylpropanone, hydroxycyclohexanephenyl ketone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and isopropylthioxanthone.

[0016] In some embodiments of the present invention, the dehumidifying filler includes, as required, silica gel powder and, optionally, molecular sieve powder.

[0017] Furthermore, the silica powder may be selected from one or more of type A silica powder, type B silica powder, and type C silica powder.

[0018] Furthermore, the molecular sieve powder may be selected from one or more of type 4A molecular sieve powder, type 5A molecular sieve powder, and type 13X molecular sieve powder.

[0019] According to some specific aspects of the present invention, the dehumidifying filler is composed of silica gel powder and molecular sieve powder, wherein the molecular sieve powder accounts for about 10%-40% by mass percentage.

[0020] In some embodiments of the present invention, the pore-forming agent is one or more combinations selected from ammonium chloride, ammonium carbonate, ammonium bicarbonate, sodium carbonate, sodium bicarbonate, urea, and ammonium polyphosphate.

[0021] According to some preferred aspects of the present invention, the mixed slurry contains, by weight, 100 parts of photocurable resin, 0.1-15 parts of photoinitiator, 30-90 parts of dehumidifying filler, 10-50 parts of pore-forming agent, and 5-60 parts of reactive diluent.

[0022] According to some preferred aspects of the invention, the silica sol layer is formed by coating the surface of the sheet paper with silica sol, wherein the silica sol is a neutral silica sol with a mass concentration of 10%-30%.

[0023] In some specific and preferred embodiments of the present invention, before the calcination is performed, the intermediate is first dried to a constant weight, and the drying temperature is 30-60°C.

[0024] In some specific and preferred embodiments of the present invention, after the roasting is performed, the parts are washed and dried in sequence.

[0025] According to some preferred aspects of the invention, the calcination temperature is 300-600°C.

[0026] In some embodiments of the present invention, the roasting time is 0.5-5 hours.

[0027] In some embodiments of the present invention, the photocuring is performed by irradiating with ultraviolet light.

[0028] In some embodiments of the present invention, the preparation of the photocurable dehumidifier includes:

[0029] Acrylate, reactive diluent, photoinitiator, dehumidifying filler and pore-forming agent are formulated into a uniform slurry, and the viscosity of the system is adjusted by the amount of reactive diluent.

[0030] After the glass fiber paper is impregnated with the prepared pulp, it is fed into the corrugated roller and pressed into a corrugated shape. An ultraviolet lamp is set at the exit end of the corrugated roller so that the fiber paper can be cured and shaped as soon as it leaves the roller, thus producing corrugated paper.

[0031] Another glass fiber paper is brushed with the aforementioned slurry and then cured by irradiating with ultraviolet light to form a flat paper. Then, silica sol is brushed on and bonded to the aforementioned corrugated paper. The paper is stacked in the order of one layer of corrugated paper and one layer of flat paper to form a honeycomb-shaped block. After stacking to a certain size, it is dried at a low temperature.

[0032] The dried sample is placed in a muffle furnace for calcination. After cooling, the free dust remaining after calcination is washed away with ethanol and then dried to obtain the corresponding photocurable dehumidifying material.

[0033] Another technical solution provided by the present invention: a photocurable dehumidifier prepared by the above-described method for preparing photocurable dehumidifier.

[0034] Another technical solution provided by the present invention: the application of the above-mentioned photocurable dehumidifying material in the preparation of a dehumidifying rotor.

[0035] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0036] This invention innovatively uses photocurable resin as an adhesive, loading the dehumidifying filler onto the substrate surface during the substrate molding stage. This integrates substrate molding and effective component coating into a single process, saving time and effectively reducing adhesive usage, thus increasing the proportion of effective components in the entire sample. Furthermore, in the subsequent calcination step, most of the photocurable resin is burned off. Combined with the gas released by the pore-forming agent, this transforms the originally smooth coating into a porous structure, giving it adsorption capacity. Simultaneously, some of the pre-added dehumidifying filler and silica sol form a self-supporting silica ceramic structure during calcination, ultimately resulting in an adsorption material with both porous structure and sufficient strength. Therefore, this invention's photocurable dehumidifying material possesses advantages such as high strength, minimal powder shedding, simple process, and short preparation cycle. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the preparation process of corrugated paper in an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of dehumidification performance testing in an embodiment of the present invention. Detailed Implementation

[0039] The above-mentioned solution will be further described below with reference to specific embodiments; it should be understood that these embodiments are used to illustrate the basic principles, main features and advantages of the present invention, and the present invention is not limited to the scope of the following embodiments; the implementation conditions used in the embodiments can be further adjusted according to specific requirements, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0040] Unless otherwise specified in the following examples, all raw materials are commercially available or prepared by conventional methods in the art.

[0041] In the following description, polyurethane acrylate was purchased from Sartoma, grade CN981 NS; polyester acrylate was purchased from Sartoma, grade CN2254 NS; epoxy acrylate was purchased from Sartoma, grade CN104 NS; type A silica powder was purchased from Qingdao Chenrong New Materials Co., Ltd.; type B silica powder was purchased from Qingdao Chenrong New Materials Co., Ltd.; type C silica powder was purchased from Qingdao Chenrong New Materials Co., Ltd.; type 4A molecular sieve powder was purchased from Aladdin; type 5A molecular sieve powder was purchased from Aladdin; type 13X molecular sieve powder was purchased from Aladdin; ammonium polyphosphate was purchased from Aladdin; and neutral silica sol was purchased from Shanghai Yuanye Biotechnology Co., Ltd., diluted to a mass concentration of 20% before use.

[0042] Example 1

[0043] This example provides a method for preparing a photocurable dehumidifier and the resulting photocurable dehumidifier. The preparation method includes:

[0044] Take 100 parts by weight of polyurethane acrylate, 30 parts by weight of diethylene glycol diacrylate, 20 parts by weight of pentaerythritol triacrylate, 6 parts by weight of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 38 parts by weight of type B silica powder, 10 parts by weight of ammonium chloride, and 8 parts by weight of ammonium polyphosphate. Mix all raw materials together and stir evenly. Then, ultrasonically disperse for 30 minutes to obtain the desired mixed slurry.

[0045] Glass fiber paper is impregnated with a mixed slurry and then pressed into a corrugated shape using corrugated rollers. An ultraviolet irradiation zone is set at the exit of the corrugated rollers, so that the glass fiber paper is cured and set as soon as it leaves the corrugations, resulting in corrugated paper loaded with UV-curable resin (see schematic diagram of the preparation process). Figure 1 (As shown). Another glass fiber paper was brushed with the mixed slurry and cured by UV irradiation to obtain a sheet paper loaded with UV-curable resin. Then, a 20% (w / w) neutral silica sol was brushed onto the surface of the sheet paper and it was attached to the corrugated paper. The corrugated paper and sheet paper were stacked alternately to obtain a honeycomb-shaped block, which was then baked at 40°C to constant weight.

[0046] The obtained block was placed in a muffle furnace and calcined at 500°C for 2 hours. After cooling, the free dust remaining after calcination was washed away with anhydrous ethanol, and then dried to obtain the desired light-curing dehumidifying material.

[0047] Example 2

[0048] This example provides a method for preparing a photocurable dehumidifier and the resulting photocurable dehumidifier. The preparation method includes:

[0049] Take 100 parts by weight of polyester acrylate, 10 parts by weight of hydroxyethyl methacrylate, 30 parts by weight of trimethylolpropane triacrylate, 5 parts by weight of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 5 parts by weight of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylphenylpropanone, 10 parts by weight of type A silica gel powder, 10 parts by weight of type B silica gel powder, 10 parts by weight of type 4A molecular sieve powder, 5 parts by weight of ammonium carbonate, and 5 parts by weight of sodium bicarbonate. Mix all raw materials together and stir evenly, then ultrasonically disperse for 30 minutes to obtain the desired mixed slurry.

[0050] Glass fiber paper is impregnated with a mixed slurry and then pressed into a corrugated shape using a corrugated roller. A UV irradiation zone is set at the exit of the corrugated roller, so that the glass fiber paper is cured and shaped as soon as it leaves the corrugation, resulting in corrugated paper loaded with UV-curable resin. Separately, glass fiber paper is brushed with the mixed slurry and cured by UV irradiation, resulting in sheet paper loaded with UV-curable resin. Then, a 20% (w / w) neutral silica sol is brushed onto the surface of the sheet paper and bonded to the corrugated paper. The corrugated paper and sheet paper are alternately stacked to form a honeycomb-shaped block, which is then baked at 30°C to constant weight.

[0051] The obtained block was placed in a muffle furnace and calcined at 350°C for 4 hours. After cooling, the free dust remaining after calcination was washed away with anhydrous ethanol, and then dried to obtain the desired light-curing dehumidifying material.

[0052] Example 3

[0053] This example provides a method for preparing a photocurable dehumidifier and the resulting photocurable dehumidifier. The preparation method includes:

[0054] Take 100 parts by weight of epoxy acrylate, 25 parts by weight of isobornyl methacrylate, 30 parts by weight of 1,4-butanediol diacrylate, 25 parts by weight of pentaerythritol tetraacrylate, 12 parts by weight of hydroxycyclohexane benzophenone, 25 parts by weight of type A silica powder, 25 parts by weight of type C silica powder, 10 parts by weight of type 13X molecular sieve powder, 15 parts by weight of ammonium chloride, 5 parts by weight of ammonium carbonate, and 16 parts by weight of urea. Mix all raw materials together and stir evenly. Then, ultrasonically disperse for 30 minutes to obtain the desired mixed slurry.

[0055] Glass fiber paper is impregnated with a mixed slurry and then pressed into a corrugated shape using a corrugated roller. A UV irradiation zone is set at the exit of the corrugated roller, so that the glass fiber paper is cured and shaped as soon as it leaves the corrugation, resulting in corrugated paper loaded with UV-curable resin. Separately, glass fiber paper is brushed with the mixed slurry and cured by UV irradiation, resulting in sheet paper loaded with UV-curable resin. Then, a 20% (w / w) neutral silica sol is brushed onto the surface of the sheet paper and bonded to the corrugated paper. The corrugated and sheet papers are alternately stacked to form a honeycomb-like block, which is then baked at 50°C to constant weight.

[0056] The obtained block was placed in a muffle furnace and calcined at 600°C for 1 hour. After cooling, the free dust remaining after calcination was washed away with anhydrous ethanol, and then dried to obtain the desired light-curing dehumidifying material.

[0057] Comparative Example 1

[0058] This example provides a method for preparing a dehumidifying material, which is basically the same as in Example 1, except that the subsequent calcination process is not performed.

[0059] The specific steps include:

[0060] Take 100 parts by weight of polyurethane acrylate, 30 parts by weight of diethylene glycol diacrylate, 20 parts by weight of pentaerythritol triacrylate, 6 parts by weight of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 38 parts by weight of type B silica powder, 10 parts by weight of ammonium chloride, and 8 parts by weight of ammonium polyphosphate. Mix all raw materials together and stir evenly. Then, ultrasonically disperse for 30 minutes to obtain the desired mixed slurry.

[0061] Glass fiber paper is impregnated with a mixed slurry and then pressed into a corrugated shape using a corrugated roller. An ultraviolet (UV) irradiation zone is set at the exit of the corrugated roller, allowing the glass fiber paper to be cured and set immediately upon leaving the corrugation, resulting in corrugated paper loaded with UV-curable resin. Separately, glass fiber paper is brushed with the mixed slurry and cured under UV light, resulting in sheet paper loaded with UV-curable resin. Then, a 20% (w / w) neutral silica sol is brushed onto the surface of the sheet paper and adhered to the corrugated paper. The corrugated and sheet papers are alternately stacked to form a honeycomb-like block, which is then dried at 40°C to constant weight, yielding the corresponding dehumidifying material.

[0062] Comparative Example 2

[0063] This example provides a method for preparing a dehumidifying material, the specific steps of which include:

[0064] Take 150 parts by weight of a 20% neutral silica sol, add 38 parts by weight of type B silica powder, stir evenly, and then ultrasonically disperse for 30 minutes to obtain the desired mixed slurry. Take a commercially available honeycomb glass fiber carrier, impregnate it with the mixed slurry, and then bake it at 40°C to constant weight to obtain the corresponding dehumidifying material.

[0065] Comparative Example 3

[0066] This example provides a method for preparing an in-situ synthesized silica gel desiccant material, the specific steps of which include:

[0067] Prepare 10 kg of 40% sodium silicate (modulus 3.1). Immerse a commercially available honeycomb glass fiber carrier in the sodium silicate for 2 hours with continuous stirring. Then remove the carrier and dry it in an oven. After the carrier is completely dry, place it in a 20% hydrochloric acid solution and react at 45°C for 6 hours (with continuous stirring during the reaction). After the reaction is complete, remove the carrier and soak it in clean water for 72 hours for aging, changing the clean water every 24 hours. After removing the sample, rinse it with running water for 10 minutes, and then dry it in an oven at 250°C for 6 hours to obtain the corresponding dehumidifying material.

[0068] Performance testing

[0069] Take the materials obtained in Examples 1-3 and Comparative Examples 1-3, and cut out 100mm pieces respectively. 3 The test blocks were dried to constant weight, and their initial mass m0 was recorded. They were then placed in a testing machine to test their dehumidification performance (e.g., ...). Figure 2 As shown, the cavity cross-section of the testing machine is 100mm. 2A square sample was placed inside, ensuring no air leakage (the honeycomb surface being the windward side). An internal airflow with a temperature of 15℃, relative humidity of 85%, and a surface velocity of 2.0 m / s was provided. The sample was allowed to adsorb for 7.5 minutes, after which its mass (m1) was recorded. The dehumidification performance of the material was characterized by the mass difference before and after adsorption, i.e., the adsorption amount (Δm). The test results are shown in Table 1.

[0070] △m=m1-m0

[0071] The sample was placed in the test chamber, the face wind speed was adjusted to 5.0 m / s, and a dark paper was placed at the rear end of the sample. The presence of powder on the paper was observed to characterize the bonding strength of the effective components on the sample surface. The test results were also recorded in Table 1.

[0072] Table 1 Performance test results of each sample

[0073] Adsorption capacity Δm(g) Does it lose powder? Example 1 36.1 no Example 2 33.2 no Example 3 35.9 no Comparative Example 1 6.7 no Comparative Example 2 26.3 yes Comparative Example 3 36.9 no

[0074] A comparison between Example 1 and Comparative Example 1 shows that the dehumidification effect of the material obtained without calcination is very poor. Analysis suggests this is because the UV-cured resin embeds most of the dehumidifying filler within the coating, and the UV-cured resin itself has a hydrophobic and smooth surface, which is not conducive to the adsorption of water vapor. However, the material obtained after calcination has most of the UV-cured resin burned off, and the pore-forming agent releases gas due to decomposition at high temperatures. The combined effect of these two factors creates a large number of porous structures, and the embedded silica gel is exposed to the surface, effectively capturing water vapor. Therefore, its dehumidification performance is significantly improved.

[0075] Compared to Comparative Example 2, Example 1 not only exhibits higher powder bonding strength but also better dehumidification effect. Comparative Example 2 relies solely on the adhesive properties of silica sol to coat the dehumidifying filler onto the substrate surface. When the amount of dehumidifying filler is small, its dehumidification performance decreases; conversely, increasing the amount of dehumidifying filler leads to a decrease in the powder's bonding strength. Example 1, however, first fixes the dehumidifying filler inside the photocurable resin. During subsequent calcination, the silica gel itself produces an effect similar to sintered ceramics, thus improving its strength and reducing the likelihood of powder shedding.

[0076] Furthermore, the porous material prepared by the method described in this invention has the advantages of simple process flow and short preparation cycle. Typically, high-performance silica gel dehumidifying materials require in-situ synthesis, which involves loading a liquid silicon source onto a honeycomb substrate, drying it, and then performing an acidification reaction. Subsequent steps include aging and activation, with the aging step alone potentially taking longer than the entire process described in this invention. A comparison between Example 1 and Comparative Example 3 shows comparable moisture absorption, indicating that the material obtained by this process can achieve better dehumidification performance.

[0077] In summary, the photocurable dehumidifier prepared by the method described in this invention has the advantages of short preparation cycle, high bonding strength and good dehumidification effect, and has great application potential in the preparation of dehumidifier rotor cores.

[0078] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

[0079] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

Claims

1. A method for preparing a photocurable dehumidifying material, characterized in that, The preparation method includes: The photocurable resin, photoinitiator, dehumidifying filler, pore-forming agent, and reactive diluent are mixed to form a mixed slurry; The first glass fiber paper is loaded with the mixed pulp, and after loading, it is pressed into a corrugated shape, and then cured by light to produce corrugated paper; The mixed pulp is loaded onto a second glass fiber paper, and after loading, it is photocured to form a sheet paper. Then, a silica sol layer is deposited on the surface of the sheet paper. An intermediate body is formed by alternately stacking the corrugated paper and the sheet paper with the silica sol layer; wherein the silica sol layer is used to bond the corrugated paper and the sheet paper. The intermediate is then calcined.

2. The method for preparing the photocurable dehumidifying material according to claim 1, characterized in that, The photocurable resin is an acrylic resin, which is selected from one or more combinations of polyurethane acrylate, polyester acrylate or epoxy acrylate.

3. The preparation method of the photocurable dehumidifier according to claim 1, characterized in that, The reactive diluent is selected from one or more combinations of hydroxyethyl methacrylate, hydroxypropyl methacrylate, isobornyl methacrylate, diethylene glycol diacrylate, 1,4-butanediol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, and pentaerythritol tetraacrylate; and / or, the photoinitiator is selected from one or more combinations of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylphenylpropanone, hydroxycyclohexanephenyl ketone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and isopropylthioxanthone.

4. The method for preparing the photocurable dehumidifying material according to claim 1, characterized in that, The dehumidifying filler includes, by choice, silica gel powder and, optionally, molecular sieve powder; and / or, the pore-forming agent is one or more combinations selected from ammonium chloride, ammonium carbonate, ammonium bicarbonate, sodium carbonate, sodium bicarbonate, urea, and ammonium polyphosphate.

5. The method for preparing the photocurable dehumidifying material according to claim 1, characterized in that, By mass, the mixed slurry contains 100 parts of photocurable resin, 0.1-15 parts of photoinitiator, 30-90 parts of dehumidifying filler, 10-50 parts of pore-forming agent, and 5-60 parts of reactive diluent.

6. The method for preparing the photocurable dehumidifying material according to claim 1, characterized in that, The silica sol layer is formed by coating the surface of the sheet paper with silica sol, wherein the silica sol is a neutral silica sol with a mass concentration of 10%-30%.

7. The method for preparing the photocurable dehumidifying material according to claim 1, characterized in that, Before the calcination, the intermediate is dried to a constant weight at a temperature of 30-60°C; and / or, after the calcination, it is washed and dried sequentially.

8. The method for preparing the photocurable dehumidifying material according to claim 1, characterized in that, The roasting temperature is 300-600℃.

9. A photocurable dehumidifier prepared by the method described in any one of claims 1-8.

10. The application of the photocurable dehumidifying material according to claim 9 in the preparation of a dehumidifying impeller.

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