Humidity adjusting material and preparation method thereof

Abstract

The invention belongs to the technical field of humidity control, and particularly relates to a humidity adjusting material and a preparation method thereof. According to the invention, water provides a dispersion and moisture absorption basic environment for other components, the moisture absorbent and the binder are dissolved in water and then interact with each other to form a system with certain viscosity and moisture absorption capability, and the strong moisture absorption characteristic of the moisture absorbent is combined with the auxiliary moisture absorption and binding effects of the binder, so that the moisture absorption capability of the adjusting material is enhanced. The high water absorption of the water-absorbent resin is cooperated with a system formed by the moisture absorbent and the binder, so that the moisture absorption capacity of the adjusting material is greatly improved, and a formed gel structure is beneficial to stabilizing moisture and realizing the long-term effect of humidity adjustment. The humidity adjusting material provided by the invention can automatically perform moisture absorption or moisture release operation according to the environment humidity without external energy supply, effectively adjusts the environment humidity, and has the advantages of large moisture absorption capacity and high moisture absorption speed.

Description

Technical Field

[0001] The present invention belongs to the technical field of humidity control, and particularly relates to a humidity regulating material and a preparation method thereof. Background Art

[0002] In the field of environmental humidity control, traditional moisture-absorbing materials mainly include desiccants such as silica gel and calcium chloride. The above desiccants are widely used in small enclosed spaces, such as electronic device packaging boxes and medicine bottles, to keep the internal environment dry by physically adsorbing moisture in the air.

[0003] However, the above desiccants also have the following defects: (1) Limited moisture absorption capacity: The moisture absorption amounts of desiccants such as silica gel and calcium chloride are relatively small, and they quickly reach saturation in a high-humidity environment, requiring frequent replacement, which increases the use cost and maintenance workload. (2) Slow moisture absorption speed: The moisture absorption process of the above desiccants is relatively slow, and it is difficult to effectively reduce the environmental humidity in a short time. In some environments sensitive to humidity changes, such as cultural relic protection sites, when the humidity rises rapidly, traditional desiccants cannot respond in time, which may cause damage to cultural relics. (3) No bidirectionality of humidity regulation: It can only perform moisture absorption operations and cannot release moisture to regulate humidity when the environmental humidity decreases, and cannot adapt to environments with large humidity fluctuations. Summary of the Invention

[0004] The purpose of the present invention is to provide a humidity regulating material and a preparation method thereof. The humidity regulating material provided by the present invention has the advantages of large moisture absorption capacity and fast moisture absorption speed, and can automatically perform moisture absorption or moisture release operations according to the environmental humidity to effectively regulate the environmental humidity.

[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] The present invention provides a humidity regulating material, which comprises the following components in mass percentage: 60-70% of water, 5-10% of a moisture absorbent, 8-12% of a binder, and 10-15% of a water-absorbing resin;

[0007] The moisture absorbent includes one or more of lithium chloride, calcium chloride, and magnesium sulfate;

[0008] The binder includes one or more of polyvinyl alcohol, polyacrylate, polyurethane, and epoxy resin;

[0009] The water-absorbing resin includes one or more of sodium polyacrylate, polyacrylamide, and polyethylene oxide.

[0010] Preferably, the humidity regulating material includes 61.61-69.61% of water, 8.74-9.74% of a moisture absorbent, 9.51-10% of a binder, and 12.14-14% of a water-absorbing resin.

[0011] Preferably, the humidity regulating material further comprises a wrapping layer, and the material of the wrapping layer has a porous structure;

[0012] The material of the wrapping layer includes non-woven fabric, cotton cloth, ramie cloth, silk, geotextile, felt cloth, dust-free cloth, artificial cotton, Lycra cotton, canvas, linen, denim, polyester fiber cloth, nylon cloth, spandex cloth, polytetrafluoroethylene film or polyurethane film.

[0013] The present invention also provides a preparation method of the humidity regulating material according to the above technical solution, comprising the following steps:

[0014] After preheating water, a hygroscopic agent and a binder are added in sequence and stirred and dissolved to obtain a mixed solution;

[0015] The mixed solution and a water-absorbing resin are mixed and then dried to obtain the humidity regulating material.

[0016] Preferably, the temperature of the preheating is 70-90 °C.

[0017] Preferably, the time of the stirring and dissolving is 2-4 h.

[0018] Preferably, the mixing sequence is: under the condition of stirring, the water-absorbing resin is added to the mixed solution, and continuous stirring is carried out after the addition; the time of the continuous stirring is 1-2 h.

[0019] Preferably, before drying, it further includes pressing the obtained slurry into a shape.

[0020] Preferably, the temperature of the drying is 90-100 °C and the time is 20-24 h.

[0021] Preferably, when the humidity regulating material further comprises a wrapping layer, the preparation method is:

[0022] After mixing the mixed solution and the water-absorbing resin, the obtained slurry is spread on the wrapping layer for wrapping and drying.

[0023] The present invention provides a humidity regulating material, comprising components with the following mass percentages: 60-70% of water, 5-10% of a hygroscopic agent, 8-12% of a binder and 10-15% of a water-absorbing resin; the hygroscopic agent includes one or more of lithium chloride, calcium chloride and magnesium sulfate; the binder includes one or more of polyvinyl alcohol, polyacrylate, polyurethane and epoxy resin; the water-absorbing resin includes one or more of sodium polyacrylate, polyacrylamide and polyethylene oxide.

[0024] In the present invention, water provides a basic environment for the dispersion and moisture absorption of other components. After the moisture absorbent and the binder are dissolved in water, they interact with each other to form a system with certain viscosity and moisture absorption capacity. The strong moisture absorption characteristics of the moisture absorbent are combined with the auxiliary moisture absorption and binding effects of the binder, enhancing the water adsorption capacity of the regulating material. The high water absorption of the water-absorbing resin synergizes with the system formed by the moisture absorbent and the binder, greatly improving the moisture absorption capacity of the regulating material. The gel structure formed by it helps to stabilize moisture and achieve the long-term effectiveness of humidity regulation. The humidity regulating material provided by the present invention can automatically absorb or release moisture according to the environmental humidity without external energy supply, effectively regulating the environmental humidity, having the advantages of large moisture absorption capacity, fast moisture absorption speed, and good stability and regenerability. At the same time, the humidity regulating material provided by the present invention has low cost, is easy to use, and the shape and volume of the humidity regulating material can be adjusted according to actual needs, with flexible use. During the use process, no external energy and power equipment are required, and no noise is generated, making it suitable for various places sensitive to noise and with limited energy supply, such as indoor air conditioning, moisture-proof of electronic equipment, cultural relic protection, food storage, etc.

[0025] Furthermore, the humidity regulating material provided by the present invention further includes a wrapping layer, which not only ensures the structural integrity and use safety of the regulating material, but also cooperates with the internal material with its breathability and self-moisture absorption performance, further optimizing the humidity regulation effect.

[0026] The present invention also provides a preparation method of the humidity regulating material described in the above technical solution, including the following steps: after preheating water, sequentially add the moisture absorbent and the binder, stir and dissolve to obtain a mixed solution; mix the mixed solution and the water-absorbing resin and then dry to obtain the humidity regulating material. The present invention ensures the full dissolution and uniform mixing of each material by controlling the addition sequence of each material, forming a moisture absorption system with stable performance. The raw materials provided by the present invention have low cost, and the preparation process is simple, without the need for complex equipment and high energy consumption, which is conducive to large-scale production and cost reduction. No harmful substances are generated during the whole preparation process and use process, and the waste regulating material has little impact on the environment, meeting the environmental protection requirements. Description of the Drawings

[0027] Figure 1 It is the humidity change curve of each regulating piece in Test Example 2;

[0028] Figure 2 It is the weight change diagram of each regulating piece in Test Example 2;

[0029] Figure 3 It is the weight change percentage diagram of each regulating piece in Test Example 2;

[0030] Figure 4 It is the humidity change curve diagram of the regulating piece inside the electrical cabinet in Test Example 3. Detailed implementation mode

[0031] The present invention provides a humidity regulating material, comprising components in the following mass percentages: 60-70% of water, 5-10% of a hygroscopic agent, 8-12% of a binder, and 10-15% of a water-absorbing resin;

[0032] The hygroscopic agent includes one or more of lithium chloride, calcium chloride, and magnesium sulfate;

[0033] The binder includes one or more of polyvinyl alcohol, polyacrylate, polyurethane, and epoxy resin;

[0034] The water-absorbing resin includes one or more of sodium polyacrylate, polyacrylamide, and polyethylene oxide.

[0035] Calculated by mass percentage, the humidity regulating material provided by the present invention includes 60-70% of water, specifically preferably 60%, 61%, 62%, 63%, 64%, 65%, 65.61%, 66%, 67%, 68%, 69%, 69.61%, 70%. In the present invention, the water is preferably deionized water. The present invention selects water as a solvent, which not only provides a good dispersion medium, but also participates in the moisture absorption and desorption to a certain extent during the humidity regulation process, providing a basic environment for the dispersion and moisture absorption of other components.

[0036] Calculated by mass percentage, the humidity regulating material provided by the present invention includes 5-10% of a hygroscopic agent, specifically preferably 5%, 6%, 7%, 8%, 9%, 9.74%, 10%. In the present invention, the hygroscopic agent includes one or more of lithium chloride, calcium chloride, and magnesium sulfate. In the present invention, the hygroscopic agent has a high hygroscopic capacity and can still maintain good hygroscopic performance at relatively low relative humidity.

[0037] Calculated by mass percentage, the humidity regulating material provided by the present invention includes 8-12% of a binder, specifically preferably 8%, 9%, 9.51%, 10%, 10.51%, 11%, 12%. In the present invention, the binder includes one or more of polyvinyl alcohol, polyacrylate, polyurethane, and epoxy resin. In the present invention, the binder and the hygroscopic agent act together. On the one hand, it enhances the viscosity of the material and is beneficial to molding. On the other hand, its own hydroxyl structure can also form hydrogen bonds with water molecules to assist the moisture absorption process.

[0038] In terms of mass percentage, the humidity regulating material provided by the present invention comprises 10-15% of a water-absorbing resin, specifically preferably 10%, 11%, 11.14%, 12%, 13%, 14%, 14.14%, 15%. In the present invention, the water-absorbing resin comprises one or more of sodium polyacrylate (SAP), polyacrylamide, and polyethylene oxide. In the present invention, the water-absorbing resin has a super strong water absorption capacity, can greatly improve the moisture absorption capacity of the humidity regulating material, and forms a gel-like structure after absorbing water, which helps to lock in moisture and slowly release it when the humidity decreases.

[0039] In the present invention, the humidity regulating material preferably further comprises a wrapping layer, and the material of the wrapping layer preferably has a porous structure; the material of the wrapping layer preferably comprises non-woven fabric, cotton cloth, ramie cloth, silk, geotextile, felt cloth, cleanroom cloth, rayon, Lycra cotton, canvas, linen, denim, polyester fiber cloth, nylon cloth, spandex cloth, polytetrafluoroethylene (PTFE) film or polyurethane (PU) film. In the present invention, the wrapping layer has good air permeability, ensuring that air can freely enter and exit the regulating material, while preventing the internal material from scattering, and the wrapping layer itself also has a certain moisture absorption and water storage capacity, which can assist in regulating humidity.

[0040] In the present invention, the humidity regulating material preferably further comprises a humidity color card, which can change color according to humidity changes. In the present invention, when the humidity is less than 40%, the color of the humidity color card is light yellow; when the humidity is 40%, the color of the humidity color card is dark yellow; when the humidity is greater than 40%, the color of the humidity color card is brown. By setting the color card, the humidity change is visualized.

[0041] The present invention also provides a preparation method of the humidity regulating material described in the above technical solution, comprising the following steps:

[0042] After preheating water, a moisture absorbent and a binder are added in sequence and stirred and dissolved to obtain a mixed solution;

[0043] The mixed solution and the water-absorbing resin are mixed and then dried to obtain the humidity regulating material.

[0044] In the present invention, after preheating water, a moisture absorbent and a binder are added in sequence and stirred and dissolved to obtain a mixed solution. In the present invention, the temperature of the preheating is preferably 70-90°C, more preferably 80°C. In the present invention, the time for the stirring and dissolving is preferably 2-4 h.

[0045] After obtaining the mixed solution, the present invention mixes the mixed solution with the water-absorbing resin and then dries it to obtain the humidity-adjusting material. In the present invention, the order of mixing is preferably: adding the water-absorbing resin to the mixed solution under stirring conditions, and continuously stirring after the addition is completed; the time of continuous stirring is preferably 1 to 2 h.

[0046] In the present invention, before drying, it preferably further includes pressing the obtained slurry into a shape. The present invention has no special limitation on the process of pressing into a shape, and specifically preferably presses it into a sheet shape. The present invention has no special limitation on the thickness of the sheet shape, which can be adjusted according to actual use requirements.

[0047] In the present invention, the drying temperature is preferably 90 to 100 °C, the time is preferably 20 to 24 h, and more preferably 21 to 22 h. In the present invention, when it is necessary to press into a shape, the drying is preferably carried out in two steps, specifically: the first drying is carried out under the condition of maintaining pressure, and the second drying is carried out after removing the pressure; the temperature of the first drying is preferably 100 °C, and the time is preferably 10 h; the temperature of the second drying is preferably 90 to 100 °C, and the time is preferably 12 h.

[0048] In the present invention, when the humidity-adjusting material further includes a wrapping layer, the preparation method is preferably: after mixing the mixed solution with the water-absorbing resin, spreading the obtained slurry on the wrapping layer for wrapping and drying.

[0049] The humidity-adjusting material provided by the present invention can quickly respond to humidity changes in an environment with a relative humidity of 30 to 95%: when the environmental humidity is higher than 70%, the moisture absorption rate can reach 10 to 15 g / kg·h, and the environmental humidity can be quickly reduced; when the environmental humidity is lower than 40%, it can slowly release moisture to keep the environmental humidity stable.

[0050] Unless otherwise specified, the materials and equipment used in the present invention are all commercially available products in the art.

[0051] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the embodiments in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0052] Example 1

[0053] In this example, the mass percentage content of each component is: deionized water 69.61%, lithium chloride 9.74%, polyvinyl alcohol 9.51%, and sodium polyacrylate 11.14%;

[0054] Heat deionized water to 80°C, and sequentially add lithium chloride and polyvinyl alcohol. Stir and dissolve for 3 h until clear and transparent to obtain a mixed solution;

[0055] Under stirring conditions, add sodium polyacrylate to the mixed solution and stir for 1 h until it becomes viscous to obtain a slurry;

[0056] Press the obtained slurry into sheets, perform the first drying under pressure-maintaining conditions, and then perform the second drying after removing the pressure; the temperature of the first drying is 100°C and the time is 10 h; the temperature of the second drying is 90°C and the time is 12 h, thus obtaining a humidity regulating material, specifically in sheet form, hereinafter referred to as the regulating sheet.

[0057] Example 2

[0058] Obtain a slurry in the manner of Example 1;

[0059] Spread the obtained slurry on a non-woven fabric, cover it with another layer of non-woven fabric, press it into sheets after covering, perform the first drying under pressure-maintaining conditions, and then perform the second drying after removing the pressure; the temperature of the first drying is 100°C and the time is 10 h; the temperature of the second drying is 95°C and the time is 12 h, thus obtaining a humidity regulating material wrapped with non-woven fabric.

[0060] Example 3

[0061] In this example, the mass percentage content of each component is: deionized water 65.61%, calcium chloride 9.74%, polyvinyl alcohol 10.51%, and sodium polyacrylate 14.14%;

[0062] Heat deionized water to 85°C, sequentially add calcium chloride and polyvinyl alcohol, stir and dissolve for 2 h until clear and transparent to obtain a mixed solution;

[0063] Under stirring conditions, add sodium polyacrylate to the mixed solution and stir for 1 h until it becomes viscous to obtain a slurry;

[0064] Press the obtained slurry into sheets, perform the first drying under pressure-maintaining conditions, and then perform the second drying after removing the pressure; the temperature of the first drying is 110°C and the time is 8 h; the temperature of the second drying is 90°C and the time is 12 h, thus obtaining a humidity regulating material, specifically in sheet form, hereinafter referred to as the regulating sheet.

[0065] Example 4

[0066] Obtain a slurry in the manner of Example 2;

[0067] The obtained slurry is spread on a porous polytetrafluoroethylene (PTFE) membrane, and then covered with another layer of porous polytetrafluoroethylene (PTFE) membrane. After covering, it is pressed into a sheet, and the first drying is carried out under pressure, and the second drying is carried out after removing the pressure; the temperature of the first drying is 100 °C and the time is 10 h; the temperature of the second drying is 95 °C and the time is 12 h, thus obtaining a humidity regulating material wrapped with a polytetrafluoroethylene membrane.

[0068] Performance Test

[0069] Test Example 1

[0070] In a 20 m 3 indoor space test, the initial humidity is 80%. After using the regulating sheet (with a mass of 50 g and a size of 30*40 cm) obtained in Example 1 for 2 - 3 hours, the humidity can be reduced to about 60%. It has a large moisture absorption capacity, and the saturated moisture absorption amount can reach 50% - 60% of its own mass, which is 2 - 3 times higher than that of traditional silica gel desiccants. It has good two-way humidity regulation, can adapt to environments with large humidity fluctuations, and effectively maintains the environmental humidity within a suitable range.

[0071] After 100 moisture absorption - desorption cycle tests, the structure of the regulating sheet is intact, and the moisture absorption performance decreases by no more than 10%, showing good stability. When the moisture absorption is saturated, it can be regenerated by heating at 60 - 80 °C for 2 - 3 hours, and the recovery rate of the moisture absorption performance after regeneration can reach more than 90%, and it can be reused multiple times.

[0072] Test Example 2

[0073] Taking commercially available regulating sheets as a comparison, the humidity change and the weight change of the regulating sheets are tested. Among them, the commercially available regulating sheets include Anhui Huofeng MF humidity regulating sheet, Nuoneng NN - T humidity regulating sheet, and Shenzhen Kechuang KC4000 humidity regulating sheet. The mass of each regulating sheet is 300 g, and the size is 20*30 cm;

[0074] The test process is as follows: Four kinds of humidity regulating sheets are respectively placed in a ventilation box in the outdoor environment, and a blank ventilation box is set up. A thermometer and a hygrometer are placed in each ventilation box, and readings are taken regularly; the one without a humidity regulating sheet is used as a blank control (denoted as the balcony environment);

[0075] The obtained humidity change curve is as Figure 1 shown, where the self - made one is the regulating sheet provided in Example 1 of the present invention. From Figure 1 it can be seen that the humidity in the environment where the self - made regulating sheet is located remains at about 60% with little change over time; the humidity of the products of the other three companies fluctuates greatly over time, and the change curve is similar to that of the balcony environment;

[0076] The weight change diagram of the regulating sheet is as Figure 2as shown (where blue represents the weight before absorption and yellow represents the weight after absorption), the percentage change in the weight of the regulating sheet is as Figure 3 shown, from Figure 2 and 3 it can be seen that the water absorption of the self-made humidity regulating sheet is much greater than that of the other three products.

[0077] Test Example 3

[0078] The regulating sheet (Material No. 1) obtained in Example 1, Anhui Huofeng MF humidity regulating sheet (Material No. 2), and calcium chloride desiccant were subjected to an anti-condensation test; before the test, the samples were pre-treated by drying at 85°C for 48 h.

[0079] Test method:

[0080] The electrical cabinet containing the three samples was placed in an environmental chamber, and the condensation / temperature-humidity combined cycle test was carried out 10 times in accordance with GB / T 2423.34-2012. Each cycle was 24 h. Any 5 of the first 9 cycles should include a low-temperature sub-cycle, and the rest should not. The 10th cycle does not include a low-temperature sub-cycle.

[0081] The humidity change curve inside the electrical cabinet is as Figure 4 shown, from Figure 4 it can be seen that the main function of the regulating sheet provided by the present invention is to control the humidity within a certain range. When there is too much humidity, it absorbs, and when there is too little humidity, it emits, preventing the humidity from changing with the environment. It is obvious from the figure that the humidity control effect of No. 1 is about 40% in the early stage and 60% in the later stage. The other two change with the environment, and the humidity control effect is very significant compared with the third-party products.

[0082] Although the above embodiments have described the present invention in detail, they are only a part of the embodiments of the present invention, not all embodiments. Other embodiments can be obtained according to these embodiments without creative work, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A humidity conditioning material, characterized in that: The invention comprises the following components in percentage by weight: 60-70% of water, 5-10% of moisture absorbent, 8-12% of binder and 10-15% of water-absorbing resin; The desiccant includes one or more of lithium chloride, calcium chloride and magnesium sulfate; The binder includes one or more of polyvinyl alcohol, polyacrylate, polyurethane and epoxy resin; The water-absorbing resin includes one or more of sodium polyacrylate, polyacrylamide and polyethylene oxide.

2. The humidity conditioning material according to claim 1, characterized in that The humidity regulating material comprises 61.61-69.61% of water, 8.74-9.74% of moisture absorbent, 9.51-10% of binder and 12.14-14% of water absorbing resin.

3. The humidity conditioning material according to claim 1 or 2, characterized in that The humidity regulating material further comprises a wrapping layer, wherein the material of the wrapping layer has a porous structure; The material of the wrapping layer includes non-woven fabric, cotton fabric, ramie fabric, silk, geotextile, felt fabric, dust-free fabric, rayon, lycra cotton, canvas, linen, denim, polyester fabric, nylon fabric, spandex fabric, polytetrafluoroethylene film or polyurethane film.

4. The method for preparing the humidity conditioning material according to any one of claims 1 to 3, characterized in that: The following steps are involved: After preheating the water, the moisture absorbent and the binder are added in sequence, stirred and dissolved to obtain a mixed solution; The mixed liquid and the water-absorbing resin are mixed and then dried to obtain the humidity-conditioning material.

5. The preparation method according to claim 4, characterized in that: The preheating temperature is 70-90°C.

6. The preparation method according to claim 4, characterized in that: The stirring and dissolving time is 2 to 4 hours.

7. The preparation method according to claim 4, characterized in that: The mixing sequence is: adding the water-absorbing resin to the mixed solution under stirring, and continuously stirring after the addition is completed; the continuous stirring time is 1 to 2 hours.

8. The preparation method according to claim 4, characterized in that: Before the drying, the mixed slurry is pressed into shape.

9. The preparation method according to claim 4 or 8, characterized in that: The drying temperature is 90-100° C. and the drying time is 20-24 hours.

10. The preparation method according to claim 4, characterized in that: When the humidity regulating material further comprises a wrapping layer, the preparation method is: After the mixed liquid and the water-absorbing resin are mixed, the obtained slurry is spread on a wrapping layer for wrapping and drying.

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