CN114571816A - Preparation method of passive humidity adjusting sheet - Google Patents
Preparation method of passive humidity adjusting sheet Download PDFInfo
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- CN114571816A CN114571816A CN202210144967.1A CN202210144967A CN114571816A CN 114571816 A CN114571816 A CN 114571816A CN 202210144967 A CN202210144967 A CN 202210144967A CN 114571816 A CN114571816 A CN 114571816A
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- humidity
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229920000642 polymer Polymers 0.000 claims abstract description 28
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 20
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 14
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims abstract description 12
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 12
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 12
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims abstract description 12
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims abstract description 12
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 10
- 239000000243 solution Substances 0.000 claims description 28
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 14
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 14
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 238000006386 neutralization reaction Methods 0.000 claims description 12
- 230000002745 absorbent Effects 0.000 claims description 11
- 239000002250 absorbent Substances 0.000 claims description 11
- 239000004745 nonwoven fabric Substances 0.000 claims description 11
- 239000011347 resin Substances 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 229920000742 Cotton Polymers 0.000 claims description 8
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims description 8
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 5
- 239000001110 calcium chloride Substances 0.000 claims description 5
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 5
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000005457 ice water Substances 0.000 claims description 4
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 4
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 4
- 239000011780 sodium chloride Substances 0.000 claims description 4
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- 238000005303 weighing Methods 0.000 claims description 4
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 2
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- 238000010521 absorption reaction Methods 0.000 abstract description 52
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- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
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- 230000002194 synthesizing effect Effects 0.000 description 1
Images
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/16—Auxiliary treatment of granules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/16—Drying; Softening; Cleaning
- B32B38/164—Drying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/16—Halogen-containing compounds
- C08K2003/162—Calcium, strontium or barium halides, e.g. calcium, strontium or barium chloride
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- Chemical & Material Sciences (AREA)
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The preparation method of the passive humidity adjusting sheet disclosed by the invention utilizes carboxymethyl cellulose, polyvinyl alcohol and acrylic acid to synthesize a high polymer, improves the water absorption performance of the high polymer, and utilizes organic alcohol to modify the surface of high polymer powder, so as to improve the content of hydroxyl on the surface of the polymer and the moisture absorption capacity. The preparation method is simple, low in cost, good in controllability and beneficial to large-scale industrial production. The humidity adjusting sheet prepared by the invention utilizes the composite moisture absorption characteristic of inorganic salt and organic polymer, has high moisture absorption capacity and excellent constant humidity capability, can maintain the relative humidity in a certain relative closed space to be constant about 50% when the external environment humidity changes randomly, can overcome the defects of easy deliquescence, space pollution and insufficient polymer moisture absorption power of the traditional inorganic salt, and achieves the purpose of adjusting the air humidity for a long time; in addition, the shape of the humidity adjusting sheet can be changed according to the requirement by utilizing the adhesive property of the polymer, and the use is convenient.
Description
Technical Field
The invention relates to the technical field of humidity adjusting sheets, in particular to a preparation method of a passive humidity adjusting sheet which is made of super absorbent resin as a main carrier and has efficient moisture absorption and release effects.
Background
The humidity adjusting sheet is a moisture absorption and moisture prevention product which senses the change of environmental humidity based on a humidity adjusting material, adjusts the humidity by absorbing moisture when the humidity is high and releasing the moisture when the humidity is low, keeps the humidity stable and keeps the dehumidification effect for a long time. The adjusting method does not consume artificial energy, belongs to passive adjustment, and accords with the concept of green sustainable development. The development of the high-performance passive humidity adjusting sheet has important significance in the fields of national defense, indoor buildings, electric moisture protection, cultural relic protection and the like.
The humidity controlling material can be largely classified into an organic humidity controlling material and an inorganic humidity controlling material depending on the matrix material for preparing the humidity controlling material. The currently used moisture-absorbing materials are mainly inorganic materials, such as calcium chloride, lime, silica gel, clay, etc., which are mainly based on physical adsorption, and water vapor molecules are diffused in the porous (or layered) structure and in the pores (or layers). When the partial pressure of water vapor in the air is higher than the saturated vapor pressure of water on the concave liquid surface in the hole, the water vapor is adsorbed, otherwise, the water vapor is desorbed. Inorganic humidity control materials have a high moisture absorption rate, but have various defects in moisture absorption capacity, stability, and the like.
The organic humidity-controlling material usually has a three-dimensional cross-linked network structure, such as starch, polyacrylic acid, sodium polyacrylate, and the like, and the molecular structure of such moisture-absorbing material contains a large amount of hydrophilic groups such as carboxyl, amino, hydroxyl, and the like, and the humidity-controlling mechanism thereof can be understood as the interaction of various van der waals forces between the surface of the organic molecule and water molecules, such as dipole-dipole effect, hydrogen bonding effect, and the like, and the more hydrophilic groups, the greater the moisture-absorbing amount. Generally, the organic humidity conditioning material has much higher adsorbability for liquid water molecules than for gaseous water molecules. For the moisture absorption process, the gaseous water molecules are preferentially adsorbed and gathered on the outer surface of the network, so that the aperture of the network is reduced, and the diffusion of the external gaseous water molecules to the inside becomes difficult; in the water absorption process, after liquid water molecules enter the network, the network is rapidly expanded under the combined action of hydrophilic groups, osmotic pressure and electrostatic repulsion among ions, the aperture of the network is enlarged, and the water molecules can further enter the network, so that the water absorption capacity is generally higher than the moisture absorption capacity.
The composite humidity-controlling material is prepared by compounding different humidity-controlling materials or reacting and mixing with other inorganic materials, so that the saturated moisture absorption capacity and the moisture absorption and release speed of the material are greatly improved. These composite humidity control materials include inorganic salt/organic polymer composite materials, inorganic mineral/organic polymer composite materials, metal/organic polymer composite materials, and the like. The current research on the composite humidity-controlling material has the defects of complex preparation method, limited moisture absorption capacity, poor constant humidity capability, unstable moisture absorption and desorption and the like. Therefore, the invention provides a preparation method of a passive humidity adjusting sheet, which is characterized in that different types of humidity adjusting materials are compounded from the aspects of moisture absorption capacity, constant humidity capacity, environmental protection, cost and the like, and the passive humidity adjusting sheet with high moisture absorption capacity, stable moisture absorption and release, environmental protection and low cost is obtained by optimizing the chemical composition, proportion and structure of an organic phase and an inorganic phase in the composite humidity adjusting material.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of a passive humidity adjusting sheet aiming at the defects of the prior art, and the prepared passive humidity adjusting sheet can overcome the defects of easy deliquescence, space pollution and insufficient macromolecule moisture absorption power of the traditional inorganic salt, and achieves the purpose of adjusting the air humidity for a long time.
The technical scheme adopted by the invention for solving the technical problems is as follows: a preparation method of a passive humidity regulating sheet comprises the following steps:
step 1, under the condition of ice-water bath, adding 200mL of 3-6M sodium hydroxide solution into 100mL of acrylic acid until the neutralization degree is 40-80%, and obtaining acrylic acid solution with the neutralization degree of 40-80%;
step 2, weighing 0.1-17 g of carboxymethyl cellulose, dissolving in 80mL of deionized water, and gelatinizing at 30-80 ℃ for 10-60 minutes to obtain a gelatinized solution;
step 3, under the nitrogen atmosphere, sequentially adding 100mL of 2-9 wt% polyvinyl alcohol aqueous solution, 100mL of 40-80% acrylic acid solution with the neutralization degree obtained in the step 1, 0.01-0.1 g of N, N-methylene bisacrylamide and 0.1-1.2 g of potassium persulfate into the gelatinized solution, and carrying out water bath at the temperature of 60-80 ℃ for 2-8 hours to obtain a sample;
step 4, drying the obtained sample at 70-100 ℃ for 8-12 hours, crushing, and sieving particles of 30-100 meshes to obtain high-molecular polymer powder;
step 5, dissolving organic alcohol in a solvent of water/isopropanol in a volume ratio of (1-3) to obtain an organic alcohol solution; uniformly spraying an organic alcohol solution on the surface of the high molecular polymer powder obtained in the step (4), and heating at 150-250 ℃ for 10-20 minutes to obtain the sodium polyacrylate based super absorbent resin;
step 6, adding 6-60 g of one or more of lithium chloride, sodium chloride and calcium chloride into 300mL of 10-18 wt% polyvinyl alcohol aqueous solution to prepare mixed liquid;
and 7, adding 36-58 g of the sodium polyacrylate based super absorbent resin obtained in the step 5 into the mixed liquid obtained in the step 6, uniformly stirring, pouring into a container filled with non-woven fabric, paving, covering a layer of non-woven fabric on the surface, and drying at 100-110 ℃ for 18-24 hours to obtain the passive humidity adjusting sheet.
Preferably, the organic alcohol used in step 5 is one or more of methanol, ethanol, ethylene glycol and propanol.
In some embodiments, the nonwoven used in step 7 is replaced with cotton wool.
Compared with the prior art, the invention has the following advantages:
1) according to the preparation method, carboxymethyl cellulose, polyvinyl alcohol and acrylic acid are used for synthesizing a high polymer, the carboxymethyl cellulose is used as a natural renewable material, the preparation method has the advantages of environmental friendliness, biodegradability and low price, the carboxymethyl cellulose can be used as a substrate for preparing the high polymer, and meanwhile, the carboxymethyl cellulose and the polyvinyl alcohol contain a large amount of hydroxyl groups and have strong hydrophilicity, and the high polymer is compounded with the carboxymethyl cellulose and the polyvinyl alcohol, so that the water absorption performance of the high polymer can be improved;
2) the preparation method of the invention utilizes organic alcohol to modify the surface of high molecular polymer powder, and improves the content of hydroxyl on the surface of the polymer, thereby improving the moisture absorption capacity of the polymer;
3) the preparation method is simple, low in cost and good in controllability, and is beneficial to large-scale industrial production, and the materials used in the preparation method are all environment-friendly materials, so that the environment is not polluted, the domestic garbage can be treated, and the green environment-friendly requirement is met;
4) the passive humidity adjusting sheet prepared by the invention has long service life and can be recycled, and the humidity adjusting sheet has high moisture absorption capacity and excellent constant humidity capacity by utilizing the moisture absorption characteristic of the inorganic salt and organic polymer composite. When the external environment humidity changes randomly, the humidity adjusting sheet can maintain the relative humidity in a certain relative closed space to be constant at about 50%, can overcome the defects that the traditional inorganic salt is easy to deliquesce and pollutes the space and the macromolecule moisture absorption power is insufficient, and achieves the purpose of adjusting the air humidity for a long time; in addition, the shape of the humidity adjusting sheet can be changed according to the requirement by utilizing the adhesive property of the polymer, and the use is convenient.
Drawings
Fig. 1 is a schematic structural view of a passive humidity control sheet prepared in example 1 and example 2;
FIG. 2 is a schematic view showing the appearance of a vacuum drying oven with a hygrometer used for testing the humidity control effect;
FIG. 3 is a graph showing the humidity adjustment effect of the passive humidity adjustment sheet of embodiment 1 on the humidity change of the outdoor environment;
fig. 4 is a comparison graph of the moisture absorption effect of the passive humidity control sheet of examples 1 and 2, the allochroic silica gel, the conventional sodium polyacrylate organic humidity control material, and the commercial moisture absorption sheet.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The method of making a passive humidity conditioner of embodiment 1, comprising the steps of:
step 1, under the condition of ice-water bath, adding 200mL of sodium hydroxide solution with the concentration of 4.5M into 100mL of analytically pure acrylic acid with the concentration of 99% until the neutralization degree is 60%, and obtaining acrylic acid solution with the neutralization degree of 60%;
step 2, weighing 8g of carboxymethyl cellulose, dissolving the carboxymethyl cellulose in 80mL of deionized water, and gelatinizing the mixture for 20 minutes at 40 ℃ to obtain a gelatinized solution;
step 3, under the nitrogen atmosphere, sequentially adding 100mL of polyvinyl alcohol aqueous solution with the concentration of 6 wt%, 100mL of acrylic acid solution with the neutralization degree of 60% obtained in the step 1, 0.02g of N, N-methylene bisacrylamide and 0.2g of potassium persulfate into the gelatinized solution, and carrying out water bath at 70 ℃ for 6 hours to obtain a sample;
step 4, drying the obtained sample at 100 ℃ for 8 hours, crushing, and sieving particles of 30-100 meshes to obtain high molecular polymer powder;
step 5, dissolving 20mL of ethylene glycol in 30mL of water/isopropanol solvent with the volume ratio of 1:1 to obtain an organic alcohol solution; uniformly spraying an organic alcohol solution on the surface of the high molecular polymer powder obtained in the step (4), and heating for 20 minutes at 200 ℃ to obtain the sodium polyacrylate based super absorbent resin;
step 6, adding 15-25 g of lithium chloride, 6-10 g of sodium chloride and 15-25 g of calcium chloride into 300mL of polyvinyl alcohol aqueous solution with the concentration of 10-18 wt% to prepare mixed liquid;
and 7, adding 36-58 g of the sodium polyacrylate based super absorbent resin obtained in the step 5 into the mixed liquid obtained in the step 6, uniformly stirring, pouring into a container filled with non-woven fabrics (or fireproof cotton) and having the size of 250mm × 170mm × 150mm, forming a moisture absorption layer by the flattened sodium polyacrylate based super absorbent resin, covering a layer of non-woven fabrics (or fireproof cotton) on the surface of the moisture absorption layer, forming a packaging layer by the non-woven fabrics (or fireproof cotton) positioned on the upper side and the lower side of the moisture absorption layer, and finally drying at 100 ℃ for 18-24 hours to obtain the passive humidity adjusting sheet in the embodiment 1, wherein the structural schematic diagram is shown in fig. 1.
The method of making a passive humidity conditioner of embodiment 2, comprising the steps of:
step 1, under the condition of ice-water bath, adding 200mL of sodium hydroxide solution with the concentration of 4.5M into 100mL of analytically pure acrylic acid with the concentration of 99% until the neutralization degree is 60%, and obtaining acrylic acid solution with the neutralization degree of 60%;
step 2, weighing 8g of carboxymethyl cellulose, dissolving the carboxymethyl cellulose in 100mL of deionized water, and gelatinizing the mixture for 20 minutes at 40 ℃ to obtain a gelatinized solution;
step 3, under the nitrogen atmosphere, sequentially adding 100mL of polyvinyl alcohol aqueous solution with the concentration of 6 wt%, 100mL of acrylic acid solution with the neutralization degree of 60% obtained in the step 1, 0.02g of N, N-methylene bisacrylamide and 0.2g of potassium persulfate into the gelatinized solution, and carrying out water bath at 70 ℃ for 6 hours to obtain a sample;
step 4, drying the obtained sample at 100 ℃ for 8 hours, crushing, and sieving particles of 30-100 meshes to obtain high molecular polymer powder;
step 5, dissolving 20mL of ethylene glycol in 30mL of water/isopropanol solvent with the volume ratio of 1:1 to obtain an organic alcohol solution; uniformly spraying an organic alcohol solution on the surface of the high molecular polymer powder obtained in the step (4), and heating for 20 minutes at 200 ℃ to obtain the sodium polyacrylate based super absorbent resin;
step 6, adding 20-30 g of lithium chloride, 10-18 g of sodium chloride and 6-12 g of calcium chloride into 300mL of polyvinyl alcohol aqueous solution with the concentration of 10-18 wt% to prepare mixed liquid;
and 7, adding 36-58 g of the sodium polyacrylate based super absorbent resin obtained in the step 5 into the mixed liquid obtained in the step 6, uniformly stirring, pouring into a container filled with non-woven fabrics (or fireproof cotton) and having the size of 250mm × 170mm × 150mm, forming a moisture absorption layer by the flattened sodium polyacrylate based super absorbent resin, covering a layer of non-woven fabrics (or fireproof cotton) on the surface of the moisture absorption layer, forming a packaging layer by the non-woven fabrics (or fireproof cotton) positioned on the upper side and the lower side of the moisture absorption layer, and finally drying at 100 ℃ for 18-24 hours to obtain the passive humidity adjusting sheet in the embodiment 2, wherein the structural schematic diagram of the passive humidity adjusting sheet is shown in fig. 1.
The humidity control effect of the passive humidity control sheet of example 1 was tested using a vacuum drying oven with a hygrometer shown in fig. 2. During testing, the passive humidity adjusting sheet in the embodiment 1 is placed in a box body, and the box body is placed in an outdoor environment; the box body is provided with a small opening with the diameter of about 6mm and two small openings with the diameter of about 4mm, and the external dimension of the box body is 390mm multiplied by 270 mm. The humidity adjusting effect of the passive humidity adjusting sheet of embodiment 1 on the humidity change of the outdoor environment is shown in fig. 3. As can be seen from fig. 3, when the humidity of the outdoor environment changes randomly, the humidity adjusting sheet placed in the vacuum drying oven can maintain the relative humidity in the cabinet at about 50% for 4 months, and the time is prolonged.
The passive humidity adjusting sheet prepared by the invention has long service life and can be recycled, and the humidity adjusting sheet overcomes the defects of easy deliquescence, space pollution and insufficient moisture absorption power of high polymers of the traditional inorganic salt by utilizing the moisture absorption characteristic of the inorganic salt and the organic high polymer, thereby achieving the purpose of adjusting the air humidity for a long time. The concrete expression is as follows: the hygroscopicity of the inorganic/organic compound shows a synergistic effect, firstly, inorganic salt enters the interior of the polymer to improve the concentration of internal ions, so that the osmotic pressure of the inner surface and the outer surface of the polymer is increased, and the moisture on the outer surface of the polymer is accelerated to enter the interior; secondly, the inorganic salt has extremely strong hydrophilicity, so that gaseous water molecules are condensed into liquid and then absorbed by the polymer network, the moisture absorption process tends to be a water absorption process, but the moisture absorption process is different from a water absorption process (the material is in a gaseous environment), the moisture absorption amount is large, and the humidity can be kept constant for a long time.
The passive humidity control sheet of examples 1 and 2, together with allochromatic silica gel, conventional sodium polyacrylate organic humidity control material, and commercially available moisture absorption sheet were tested and compared for moisture absorption effect under 25 ℃ and 90% RH, and the test results are shown in fig. 4.
The method for calculating the moisture absorption multiplying power Q comprises the following steps:
wherein m is2Mass after moisture absorption, unit g; m is1Is the mass before moisture absorption, in g.
From the moisture absorption detection results shown in fig. 4, compared with the three control groups, the moisture absorption rate of the passive humidity control sheet in the embodiments 1 and 2 of the present invention reaches the moisture absorption rate of the inorganic humidity control material allochroic silica gel, the moisture absorption capacity is higher than that of the conventional sodium polyacrylate organic humidity control material and commercially available commercial moisture absorption sheets, the service life is significantly prolonged, and the moisture absorption performance is significant.
Claims (3)
1. A preparation method of a passive humidity regulating sheet is characterized by comprising the following steps:
step 1, under the condition of ice-water bath, adding 200mL of 3-6M sodium hydroxide solution into 100mL of acrylic acid until the neutralization degree is 40-80%, and obtaining acrylic acid solution with the neutralization degree of 40-80%;
step 2, weighing 0.1-17 g of carboxymethyl cellulose, dissolving in 80mL of deionized water, and gelatinizing at 30-80 ℃ for 10-60 minutes to obtain a gelatinized solution;
step 3, under the nitrogen atmosphere, sequentially adding 100mL of 2-9 wt% polyvinyl alcohol aqueous solution, 100mL of 40-80% acrylic acid solution with the neutralization degree obtained in the step 1, 0.01-0.1 g of N, N-methylene bisacrylamide and 0.1-1.2 g of potassium persulfate into the gelatinized solution, and carrying out water bath at the temperature of 60-80 ℃ for 2-8 hours to obtain a sample;
step 4, drying the obtained sample for 8-12 hours at 70-100 ℃, crushing, and sieving particles of 30-100 meshes to obtain high molecular polymer powder;
step 5, dissolving organic alcohol in a solvent of water/isopropanol in a volume ratio of (1-3) to obtain an organic alcohol solution; uniformly spraying an organic alcohol solution on the surface of the high molecular polymer powder obtained in the step (4), and heating at 150-250 ℃ for 10-20 minutes to obtain the sodium polyacrylate based super absorbent resin;
step 6, adding 6-60 g of one or more of lithium chloride, sodium chloride and calcium chloride into 300mL of polyvinyl alcohol aqueous solution with the concentration of 10-18 wt% to prepare mixed liquid;
and 7, adding 36-58 g of the sodium polyacrylate based super absorbent resin obtained in the step 5 into the mixed liquid obtained in the step 6, uniformly stirring, pouring into a container filled with non-woven fabric, paving, covering a layer of non-woven fabric on the surface, and drying at 100-110 ℃ for 18-24 hours to obtain the passive humidity adjusting sheet.
2. The method as claimed in claim 1, wherein the organic alcohol used in step 5 is one or more selected from methanol, ethanol, ethylene glycol and propanol.
3. The method as claimed in claim 1, wherein the non-woven fabric used in step 7 is replaced with cotton wool.
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