WO2013011941A1 - 硫酸マグネシウム系乾燥剤及びその製造方法 - Google Patents
硫酸マグネシウム系乾燥剤及びその製造方法 Download PDFInfo
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- WO2013011941A1 WO2013011941A1 PCT/JP2012/067925 JP2012067925W WO2013011941A1 WO 2013011941 A1 WO2013011941 A1 WO 2013011941A1 JP 2012067925 W JP2012067925 W JP 2012067925W WO 2013011941 A1 WO2013011941 A1 WO 2013011941A1
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/045—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium containing sulfur, e.g. sulfates, thiosulfates, gypsum
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- B01D53/26—Drying gases or vapours
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- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28004—Sorbent size or size distribution, e.g. particle size
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- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28016—Particle form
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3021—Milling, crushing or grinding
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
- B01J20/3204—Inorganic carriers, supports or substrates
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
- B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
- B01J20/3244—Non-macromolecular compounds
- B01J20/3246—Non-macromolecular compounds having a well defined chemical structure
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
- B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
- B01J20/3244—Non-macromolecular compounds
- B01J20/3246—Non-macromolecular compounds having a well defined chemical structure
- B01J20/3248—Non-macromolecular compounds having a well defined chemical structure the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3291—Characterised by the shape of the carrier, the coating or the obtained coated product
- B01J20/3293—Coatings on a core, the core being particle or fiber shaped, e.g. encapsulated particles, coated fibers
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/40—Magnesium sulfates
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- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/112—Metals or metal compounds not provided for in B01D2253/104 or B01D2253/106
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- B01D2253/25—Coated, impregnated or composite adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/30—Physical properties of adsorbents
- B01D2253/302—Dimensions
- B01D2253/304—Linear dimensions, e.g. particle shape, diameter
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- C01P2006/12—Surface area
Definitions
- the present invention relates to a novel magnesium sulfate-based desiccant and a method for producing the same.
- desiccants such as silica gel, calcium chloride, quick lime, zeolite, etc. have been used to prevent quality deterioration of products due to oxidation due to moisture absorption in the fields of food, pharmaceuticals, electronic parts, precision machinery, etc. Yes.
- desiccants are used in a granular or powder state, packaged with paper, nonwoven fabric, or the like, or put into a packaging material together with a product in a state of being enclosed in a container or the like.
- a specific desiccant for example, magnesium sulfate
- a thermoplastic resin has high moisture absorption and water retention, and does not cause defects such as liquid leakage due to scattering, moisture absorption or deliquescence. It has been proposed that a molded product itself obtained by processing and molding the composition into a film, sheet or the like is used as a desiccant, a packaging material or the like (for example, Patent Document 1, Patent Document) 2).
- thermoplastic resin selected from polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride, ABS, polyamide, polystyrene, polyvinyl alcohol, polycarbonate, ethylene-methacrylate copolymer, and polyacetal has an equilibrium vapor pressure.
- the desiccant is magnesium sulfate represented by the formula MgSO 4 ⁇ nH 2 O (where 0 ⁇ n ⁇ 3), and the surface of the desiccant Is coated with a fatty acid metal salt, and a desiccant is kneaded so that the secondary particle size when dispersed in a thermoplastic resin is 1 to 40 ⁇ m.
- thermoplastic resin Polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride
- increase / decrease the specific gravity of the thermoplastic resin by 0.01 Each time, the equilibrium humidity is increased / decreased by about 12% RH, and in the case of ABS, polyamide, polystyrene, polyvinyl alcohol, polycarbonate, ethylene-methacrylate copolymer, polyacetal, the specific gravity of the thermoplastic resin is increased by 0.01.
- a desiccant-containing thermoplastic resin composition capable of increasing / decreasing the equilibrium humidity by about RH 3% each time / reducing has been proposed.
- the desiccant according to Patent Document 3 still has room for improvement in the following two points.
- the main object of the present invention is to provide a magnesium sulfate-based desiccant that can exhibit better hydrophobicity.
- Another object of the present invention is to provide a magnesium sulfate-based desiccant having excellent storage stability.
- the present inventor has found that the above object can be achieved by performing a surface treatment on the magnesium sulfate particle surface by a specific method, and has completed the present invention. It was.
- a desiccant comprising a powder composed of coated particles in which a coating layer is formed on the particle surface of magnesium sulfate represented by the chemical formula MgSO 4 ⁇ nH 2 O (where 0 ⁇ n ⁇ 3), (1)
- the coating layer includes at least one coating material of carboxylic acid and a salt thereof, (2)
- the average particle diameter of the powder is 5 ⁇ m or less, (3)
- the contact angle of water with respect to the surface formed by the powder is 20 degrees or more.
- a magnesium sulfate-based desiccant characterized by that. 2. Item 2.
- the magnesium sulfate-based desiccant according to Item 1 wherein the magnesium sulfate is 85 to 99 parts by weight and the coating layer is 1 to 15 parts by weight in a total of 100 parts by weight of the magnesium sulfate and the coating layer. 3.
- Item 2. The magnesium sulfate-based desiccant according to Item 1, wherein the coating material contains at least one of a saturated monocarboxylic acid having 5 to 20 carbon atoms and a salt thereof. 4).
- Item 2. The magnesium sulfate-based desiccant according to Item 1, wherein the coating material contains at least one of stearic acid and calcium stearate. 5.
- a resin composition comprising the magnesium sulfate-based desiccant according to any one of items 1 to 5 and a thermoplastic resin. 7). 1) A mixed raw material containing at least one coating material of magnesium sulfate represented by the chemical formula MgSO 4 ⁇ nH 2 O (where 0 ⁇ n ⁇ 3) and 2) carboxylic acid and a salt thereof, the coating material exhibits plasticity.
- the manufacturing method of the magnesium sulfate type desiccant characterized by including the process grind
- Item 8 The production method according to Item 7, wherein the coating material contains at least one of a saturated monocarboxylic acid having 5 to 20 carbon atoms and a salt thereof. 9.
- Item 8. The method according to Item 7, wherein the coating material contains at least one of stearic acid and calcium stearate. 10. 10.
- a coating layer is effectively formed on the surface of magnesium sulfate particles, so that a specific contact angle can be expressed.
- a desiccant superior to conventional products can be provided. That is, since hydrophobicity superior to that of conventional products can be exhibited, familiarity with thermoplastic resins that are also hydrophobic is improved, and high dispersibility can be expected.
- magnesium sulfate trihydrate can be formed at the time of moisture absorption, and the trihydrate can be maintained for a certain period of time. The time to reach can be delayed. For this reason, the amount of moisture absorption from immediately after manufacture to the time of use can be suppressed, and excellent storage stability can be obtained.
- the coating layer can be effectively formed over the entire particle surface by simultaneously pulverizing the magnesium sulfate particles and forming the coating layer.
- the resulting desiccant exhibits superior properties (especially hydrophobicity) as compared to conventional products, as well as being able to be manufactured more efficiently than conventional methods in which grinding and coating are performed separately. This is also industrially advantageous in that it can be performed.
- the magnesium sulfate-based desiccant of the present invention can be suitably used for adding to a thermoplastic resin as a desiccant. Then, the resin composition in which the desiccant of the present invention is added to the thermoplastic resin exhibits excellent moisture resistance, and captures moisture generated from the thermoplastic resin or the other (for example, the contents of the container), It is possible to prevent the quality of stored products from deteriorating.
- packaging materials such as food and electronic materials are required to have characteristics such as heat resistance, chemical resistance, and ultraviolet resistance depending on their use, and are also suitable for various gases (oxygen gas, nitrogen gas, carbon dioxide gas, water vapor, etc.).
- Barrier properties are required. Resins having such gas barrier properties are polyethylene terephthalate (PET), polyvinylidene chloride (PVDC), ethylene-vinyl acetate copolymer (EVA), polyvinyl alcohol (PVA), low density polyethylene (LDPE) ethylene-vinyl alcohol.
- a copolymer (EVOH), a copolymer of PVDC and methyl acrylate, etc. are exemplified, but a resin that is susceptible to humidity (eg, EVOH, PVA, etc.) to exhibit gas barrier properties is used in the present invention. By using a desiccant, the original gas barrier properties can be reliably exhibited.
- the magnesium sulfate-based desiccant of the present invention comprises coated particles in which a coating layer is formed on the surface of magnesium sulfate particles represented by the chemical formula MgSO 4 .nH 2 O (where 0 ⁇ n ⁇ 3).
- a desiccant containing powder (1) The coating layer includes at least one coating material of carboxylic acid and a salt thereof, (2) The average particle diameter of the powder is 5 ⁇ m or less, (3) The contact angle of water with respect to the surface formed by the powder is 20 degrees or more. It is characterized by that.
- the desiccant (particles) of the present invention is mainly composed of magnesium sulfate particles as a core and a coating layer formed on the surface thereof.
- Magnesium sulfate is represented by the chemical formula MgSO 4 ⁇ nH 2 O (where 0 ⁇ n ⁇ 3), and may be either anhydrous magnesium sulfate or magnesium sulfate hydrate.
- anhydrous magnesium sulfate (MgSO 4 .nH 2 O (where 0 ⁇ n ⁇ 1, especially 0 ⁇ n ⁇ 0.99) is used in that desired moisture absorption performance and the like can be expressed. desirable.
- the coating layer contains at least one coating material of carboxylic acid and its salt.
- the carboxylic acid is not particularly limited as long as it constitutes a carboxylate used as a surfactant and the like, and may be either a saturated carboxylic acid or an unsaturated carboxylic acid, and a monocarboxylic acid, dicarboxylic acid, etc. Either may be sufficient.
- saturated monocarboxylic acids can be exemplified. Specific examples include saturated monocarboxylic acids having about 5 to 20 carbon atoms (for example, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, etc.).
- At least one of a saturated monocarboxylic acid having about 5 to 20 carbon atoms and a salt thereof can be used as a coating material.
- a metal salt can be preferably used.
- calcium salt, magnesium salt, sodium salt, etc. can be mentioned.
- at least one of a saturated monocarboxylic acid having 5 to 20 carbon atoms and a calcium salt thereof can be suitably used as the coating material, and calcium stearate or the like can be preferably used.
- the ratio of the coating layer in the coating particles can be appropriately set according to the desired hydrophobicity and the like, but generally, magnesium sulfate is 85 to 99 wt% in a total of 100 parts by weight of magnesium sulfate and the coating layer. Parts (preferably 90 to 97 parts by weight) and a coating layer 1 to 15 parts by weight (preferably 3 to 10 parts by weight).
- the average particle size of the powder is 5 ⁇ m or less, and particularly preferably 4 ⁇ m or less.
- the coated particles of the present invention exhibit hydrophobicity, more specifically, the contact angle of water with respect to the surface formed by the powder is 20 degrees or more, preferably 30 degrees or more, more preferably 80 degrees or more. . By exhibiting such hydrophobicity, it is expected to exhibit high dispersibility in the thermoplastic resin.
- the method for measuring the contact angle may follow the method described in the examples described later.
- the desiccant of the present invention is basically composed of the coated particles, but may contain other additives as necessary.
- zeolite, molecular sieve, silica gel, activated carbon, magnesium oxide, etc. as gas adsorbent magnesium carbonate, magnesium oxide, synthetic hydrotalcite, magnesium silicate, silicon dioxide, aluminum oxide, magnesium hydroxide, water as infrared absorber
- as an ultraviolet absorber titanium oxide, zinc oxide, cerium oxide, etc. may be contained within a range not impairing the effects of the present invention.
- the magnesium sulfate-based desiccant of the present invention is particularly preferably used for adding to a thermoplastic resin. That is, a resin composition containing the magnesium sulfate-based desiccant of the present invention and a thermoplastic resin is also included in the present invention.
- thermoplastic resin is not particularly limited and can be applied to any known or commercially available thermoplastic resin.
- EVA ethylene-vinyl acetate copolymer
- PVDC polyvinylidene chloride
- ethylene-methacrylate copolymer It is possible to select at least one of a polymer, an ethylene-vinyl alcohol copolymer (EVOH), a copolymer of PVDC and methyl acrylate, and a polyacetal.
- the amount added to the thermoplastic resin can be appropriately set according to the characteristics of the magnesium sulfate-based desiccant to be added, the use of the final product, etc., but this amount is usually based on 100 parts by weight of the thermoplastic resin.
- the invention desiccant is preferably 5 to 400 parts by weight.
- thermoplastic resin is not particularly limited, and may be performed in the same manner as a known desiccant addition method.
- a mixture containing a thermoplastic resin and the desiccant of the present invention may be mixed using a known apparatus such as a ribbon mixer, a tumbler mixer, a Henschel mixer, a mixing roll, and then kneaded at a temperature equal to or higher than the melting point of the thermoplastic resin.
- the resin composition according to the present invention can be easily processed and molded into an arbitrary shape according to applications such as a film shape, a sheet shape, a plate shape, a bag shape, a pellet shape, and a container shape.
- the molded product thus obtained is itself a desiccant and can be used as various products such as packaging materials, containers and lids. These products can be widely used, for example, in the fields of foods, pharmaceuticals, electronic parts, precision machines, etc., or gas barrier materials.
- the magnesium sulfate-based desiccant of the present invention is not particularly limited as long as the above-described particle structure (coating layer) can be obtained. For example, it can be more reliably produced by the following method.
- Inventive desiccant can be obtained. That is, 1) a mixed raw material containing at least one coating material of magnesium sulfate represented by the chemical formula MgSO 4 ⁇ nH 2 O (where 0 ⁇ n ⁇ 3) and 2) carboxylic acid and a salt thereof is plastic.
- a magnesium sulfate-based desiccant can be obtained by a production method characterized by including a step of pulverizing at a temperature higher than the above temperature (particularly a temperature higher than the melting point of the coating material).
- a method of coating the surface of magnesium sulfate powder (particles) already adjusted to a predetermined particle size with a fatty acid metal salt by a method such as dry mixing or wet coating is used.
- dry mixing the particle size of the fatty acid metal salt particles needs to be adjusted in advance with respect to the particle size of the magnesium sulfate particles, and the uniformity of the coating layer is significantly affected by the particle size distribution of the fatty acid metal salt particles. Therefore, it is very difficult to obtain a uniform coating layer.
- a fatty acid metal salt is liquefied by a method such as dissolution and suspension, and magnesium sulfate particles are fluidized using a stirring granulator, fluidized bed granulator, etc., and spray-dried. It is necessary to use an organic solvent when adjusting the metal salt solution. This complicates the coating process and increases costs, which is not economical. Further, the magnesium sulfate particles (powder) obtained by the conventional method are unsuitable as a desiccant or the like because aggregation occurs in the coating process and particles having a large particle diameter are generated.
- the production method of the present invention includes a step of pulverizing a mixed raw material containing magnesium sulfate particles and carboxylic acid or a salt thereof (coating material) at a constant temperature. That is, in the presence of carboxylic acid or a salt thereof, at least the magnesium sulfate particles are pulverized at a temperature at which the coating material exhibits plasticity (hereinafter also referred to as “plasticity development temperature”) or more (particularly, a temperature at or above the melting point of the coating material). Therefore, simultaneously with the formation of fine particles by pulverization, part or all of the coating material can be deformed or melted and fused to the surface of the magnesium sulfate fine particles.
- plasticity development temperature a temperature at which the coating material exhibits plasticity
- the coating layer is more reliably formed on almost the entire surface of the magnesium sulfate particles, and as a result, exhibits higher hydrophobicity than the conventional technique. That is, it is considered that the production method of the present invention can economically obtain a more excellent desiccant composition by simultaneously atomizing magnesium sulfate particles and forming a uniform coating layer.
- the pulverization temperature is preferably equal to or higher than the plastic development temperature of the coating material having the highest plasticity development temperature, and the coating material having the highest melting point More preferably, the melting point or higher.
- the pulverization method is not limited as long as it can reduce the particle size by pulverizing magnesium sulfate particles, and any known pulverization method can be adopted.
- a pulverization method performed by a known apparatus such as a ball mill, a jet mill, or a pulverizer (impact pulverizer) can be appropriately employed.
- the degree of pulverization can be appropriately set according to the desired average particle diameter and the like, but the coating layer is effectively formed and the dispersion into the thermoplastic resin is favorably performed.
- the average particle size before pulverization is 12 ⁇ m, it is desirable to adjust the average particle size after pulverization to 6 ⁇ m or less.
- the average particle size (that is, the median size (D50)) is 5 ⁇ m or less
- the particle size (D90) of 90% of the accumulated portion is 10 ⁇ m or less
- the maximum particle size (Dtop) is 15 ⁇ m or less. It is preferable to grind so that it may become.
- a mixed raw material containing magnesium sulfate powder as a starting raw material and a coating material in a predetermined ratio may be prepared, and the mixed raw material may be subjected to pulverization.
- the types of magnesium sulfate and coating materials used as starting materials, the blending amounts thereof, etc. are as described in 1. above. The thing similar to what was demonstrated in (4) can be used.
- Example 1 Average particle diameter
- the sample was ultrasonically stirred (frequency: 400 Hz), then dispersed in acetone, and measured in acetone by laser diffraction.
- “MICROTRAC HRA Model No. 9320-X100” manufactured by Honeywell was used as a measuring apparatus. From the obtained particle size distribution, the particle size (D10) of accumulated portion 10%, the median diameter of accumulated portion (D50), the particle size (D90) of accumulated portion 90%, the maximum particle size (Dtop), The median diameter was defined as the average particle diameter.
- “measuring device” “Drop Master 701” manufactured by Kyowa Interface Science Co., Ltd. was used.
- "Drop method contact angle measurement” A 22-G (inner diameter 0.4 mm) stainless needle was attached to a 1 mL glass syringe, and distilled water was filled into the glass syringe. The piston of the glass syringe was gradually pushed out to form about 4 ⁇ L of water droplets on the tip of the stainless needle. The surface of the sample was gradually brought close to the water droplet, and the water droplet and the sample surface were brought into contact with the sample surface simultaneously with the start of photographing with a CCD camera, so that the water droplet landed on the sample surface.
- Example 1 Anhydrous magnesium sulfate (average particle size 12.5 ⁇ m, BET specific surface area 3.7 m 2 / g) 99.0% by weight and calcium stearate (average particle size 5.72 ⁇ m) 1.0 wt. % Mixed powder was subjected to a dry pulverization process using an impact pulverizer (pulverizer rotational speed of 6000 to 7000 rpm, classifier rotational speed of 3000 to 4000 rpm). About the obtained pulverized product, average particle diameter (D50), D10, D90, maximum particle diameter (Dtop), contact angle, and saturated moisture absorption were measured as particle diameters. The results are shown in Table 1.
- Example 1 Anhydrous magnesium sulfate indicated as “no treatment” was absorbed while water contact occurred at the same time as contact with the water droplet in the measurement of the contact angle, so that the water drop could not be retained on the sample surface and the contact angle was not obtained.
- the sample obtained in Example 1 showed a contact angle of 32.4 °, and apparent hydrophobic expression was observed.
- Example 2 A pulverization treatment was carried out in the same manner as in Example 1 except that the total amount of anhydrous magnesium sulfate 97.0% by weight and calcium stearate 3.0% by weight was 100% by weight. About the obtained pulverized product, average particle diameter (D50), D10, D90, maximum particle diameter (Dtop), contact angle, and saturated moisture absorption were measured as particle diameters. The results are shown in Table 1. The sample obtained in Example 2 showed a contact angle of 84.4 °, and apparent hydrophobic expression was observed.
- Example 3 A pulverization treatment was carried out in the same manner as in Example 1 except that the total amount was 95.0% by weight of anhydrous magnesium sulfate and 5.0% by weight of calcium stearate. About the obtained pulverized product, average particle diameter (D50), D10, D90, maximum particle diameter (Dtop), contact angle, and saturated moisture absorption were measured as particle diameters. The results are shown in Table 1. The sample obtained in Example 3 showed a contact angle of 113.2 °, and apparent hydrophobic expression was observed.
- Example 4 A pulverization treatment was carried out in the same manner as in Example 1 except that the total amount was 90.0% by weight of anhydrous magnesium sulfate and 10.0% by weight of calcium stearate. About the obtained pulverized product, average particle diameter (D50), D10, D90, maximum particle diameter (Dtop), contact angle, and saturated moisture absorption were measured as particle diameters. The results are shown in Table 1. The sample obtained in Example 4 showed a contact angle of 122.1 °, and apparent hydrophobicity was observed.
- Comparative Example 1 Anhydrous magnesium sulfate (average particle size 12.5 ⁇ m, BET specific surface area 3.7 m 2 / g) shown as “No treatment” in Table 1 was applied to an impact-type fine pulverizer (pulverizer rotational speed 6000 to 7000 rpm, classifier rotational speed 3000 to 4000 rpm), and a pulverization process was carried out by a dry method. Next, a mixture was obtained by mixing 100% by weight (without pulverization) of the obtained pulverized anhydrous magnesium sulfate 99.0% by weight and calcium stearate (average particle size 5.72 ⁇ m) 1.0% by weight. It was.
- Comparative Example 2 A mixture was prepared in the same manner as in Comparative Example 1 except that 97.0% by weight of pulverized anhydrous magnesium sulfate and 3.0% by weight of calcium stearate were mixed for a total of 100% by weight. About the obtained mixture, average particle diameter (D50), D10, D90, maximum particle diameter (Dtop), contact angle, and saturated moisture absorption were measured as particle diameter. The results are shown in Table 2. Similar to anhydrous magnesium sulfate indicated as “no treatment”, the sample obtained in Comparative Example 2 absorbed water at the same time as contact with the water droplet in the measurement of the contact angle, and could not hold the water droplet on the sample surface. The contact angle could not be obtained.
- Comparative Example 3 A mixture was prepared in the same manner as in Comparative Example 1 except that the mixture was mixed as a total of 100% by weight of pulverized anhydrous magnesium sulfate 95.0% by weight and calcium stearate 5.0% by weight. About the obtained mixture, average particle diameter (D50), D10, D90, maximum particle diameter (Dtop), contact angle, and saturated moisture absorption were measured as particle diameter. The results are shown in Table 2.
- the sample obtained in Comparative Example 3 like anhydrous magnesium sulfate indicated as “no treatment”, water absorption occurred simultaneously with contact with water droplets in the measurement of the contact angle, and water droplets could not be retained on the sample surface. The contact angle could not be obtained.
- Comparative Example 4 A mixture was prepared in the same manner as in Comparative Example 1 except that 90.0% by weight of pulverized anhydrous magnesium sulfate and 10.0% by weight of calcium stearate were mixed. About the obtained mixture, average particle diameter (D50), D10, D90, maximum particle diameter (Dtop), contact angle, and saturated moisture absorption were measured as particle diameter. The results are shown in Table 2. Similar to anhydrous magnesium sulfate indicated as “no treatment”, the sample obtained in Comparative Example 4 absorbed water at the same time as contact with the water droplet in the measurement of the contact angle, and could not hold the water droplet on the sample surface. The contact angle could not be obtained.
- Test example 1 The desiccant compositions obtained in each Example and Comparative Example, and the appearance of anhydrous magnesium sulfate and calcium stearate particles as “no treatment” were confirmed with a scanning electron microscope. The results are shown in FIGS. 2 to 4, the “no treatment” (anhydrous magnesium sulfate particles) is FIG. 2 (a), the calcium stearate particles are FIG. 2 (b), and the sample obtained in Example 1 is FIG. 3 (c). 3 (d) shows the sample obtained in Example 2, FIG. 3 (e) shows the sample obtained in Example 3, FIG. 3 (f) shows the sample obtained in Example 4, and FIG. The obtained sample is FIG. 4 (g), the sample obtained in Comparative Example 2 is FIG.
- Test example 2 The moisture absorption rates of the desiccant compositions obtained in each Example and Comparative Example, and anhydrous magnesium sulfate and calcium stearate shown as “no treatment” were determined from the amount of moisture absorption (g / g) at each time. The results are shown in Table 3 and FIG.
- the moisture absorption rate of the untreated sample and the comparative sample is considerably high.
- the moisture absorption rate was horizontal when the moisture content was changed from anhydrous magnesium sulfate to magnesium sulfate trihydrate as the moisture was absorbed (the moisture absorption amount was around 0.49 g / g).
- the moisture absorption amount was around 0.49 g / g.
- FIG. 6 shows an enlarged view of a portion where the above phenomenon is recognized.
- the above phenomenon was particularly noticeable in Example 2, Example 3 and Example 4, and the start point and end point of the portion where the moisture absorption rate was inclined to be almost horizontal were the same in all Examples. Therefore, in order to obtain the above phenomenon more reliably, the amount of coating material is preferably 3 parts by weight or more. However, when the amount of coating material increases, the amount of magnesium sulfate in the desiccant decreases. Therefore, the moisture absorption amount of the desiccant is reduced. In view of industrial utility value, it is considered that the coating amount is preferably 15 parts by weight or less.
- the desiccant of the present invention has a portion where the moisture absorption rate becomes slow, so that the time until saturation can be delayed, which is advantageous in terms of storage stability.
- Example 5 A pulverization treatment was carried out in the same manner as in Example 1 except that the total amount of anhydrous magnesium sulfate was 97.0% and stearic acid was 3.0%. About the obtained pulverized product, average particle size (D50), D10, D90, maximum particle size (Dtop), contact angle, and saturated moisture absorption were measured as the particle size. The results are shown in Table 4. The sample obtained in Example 5 showed a contact angle of 72.1 degrees, and good hydrophobicity was confirmed.
- Example 6 The total amount of anhydrous magnesium sulfate 94.0% by weight and stearic acid 6.0% by weight was 100% by weight. About the obtained pulverized product, average particle size (D50), D10, D90, maximum particle size (Dtop), contact angle, and saturated moisture absorption were measured as the particle size. The results are shown in Table 4. The sample obtained in Example 6 showed a contact angle of 128.6 degrees and was confirmed to have high hydrophobicity.
- Example 7 A pulverization treatment was performed in the same manner as in Example 1 except that the total amount of anhydrous magnesium sulfate was 90.0% by weight and stearic acid was 10.0% by weight in total. About the obtained pulverized product, average particle size (D50), D10, D90, maximum particle size (Dtop), contact angle, and saturated moisture absorption were measured as the particle size. The results are shown in Table 4. The sample obtained in Example 7 showed a contact angle of 127.4 degrees and was confirmed to have high hydrophobicity.
- Example 8 A pulverization treatment was performed in the same manner as in Example 1 except that the total amount of anhydrous magnesium sulfate 97.0% by weight and magnesium stearate 3.0% by weight was 100% by weight. About the obtained pulverized product, average particle size (D50), D10, D90, maximum particle size (Dtop), contact angle, and saturated moisture absorption were measured as the particle size. The results are shown in Table 5. The sample obtained in Example 8 showed a contact angle of 141.3 degrees and was confirmed to have high hydrophobicity.
- Example 9 A pulverization treatment was carried out in the same manner as in Example 1 except that the total amount was 94.0% by weight of anhydrous magnesium sulfate and 6.0% by weight of magnesium stearate. About the obtained pulverized product, average particle size (D50), D10, D90, maximum particle size (Dtop), contact angle, and saturated moisture absorption were measured as the particle size. The results are shown in Table 5. The sample obtained in Example 9 showed a contact angle of 147.3 degrees and was confirmed to have high hydrophobicity.
- Example 10 A pulverization treatment was performed in the same manner as in Example 1 except that the total amount was 90.0% by weight of anhydrous magnesium sulfate and 10.0% by weight of magnesium stearate. About the obtained pulverized product, the average particle size (D50), D10, D90, the maximum particle size (Dtop), the contact angle, and the saturated moisture absorption were measured as the particle size. The results are shown in Table 5. The sample obtained in Example 10 showed a contact angle of 151.6 degrees and was confirmed to have high hydrophobicity.
- Example 11 A pulverization treatment was carried out in the same manner as in Example 1 except that the total amount of anhydrous magnesium sulfate 97.0% by weight and palmitic acid 3.0% by weight was 100% by weight. About the obtained pulverized product, average particle size (D50), D10, D90, maximum particle size (Dtop), contact angle, and saturated moisture absorption were measured as the particle size. The results are shown in Table 6. The sample obtained in Example 11 showed a contact angle of 124.7 degrees and was confirmed to have high hydrophobicity.
- Example 12 A pulverization treatment was carried out in the same manner as in Example 1 except that the total amount of anhydrous magnesium sulfate 94.0% by weight and palmitic acid 6.0% by weight was 100% by weight. About the obtained pulverized product, average particle size (D50), D10, D90, maximum particle size (Dtop), contact angle, and saturated moisture absorption were measured as the particle size. The results are shown in Table 6. The sample obtained in Example 12 showed a contact angle of 109.2 degrees and was confirmed to have high hydrophobicity.
- Example 13 A pulverization treatment was carried out in the same manner as in Example 1 except that the total amount of anhydrous magnesium sulfate 90.0% by weight and palmitic acid 10.0% by weight was 100% by weight. About the obtained pulverized product, average particle size (D50), D10, D90, maximum particle size (Dtop), contact angle, and saturated moisture absorption were measured as the particle size. The results are shown in Table 6. The sample obtained in Example 13 showed a contact angle of 86.4 degrees and was confirmed to have good hydrophobicity.
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Abstract
Description
1. 化学式MgSO4・nH2O(但し、0≦n≦3)で示される硫酸マグネシウムの粒子表面に被覆層が形成された被覆粒子からなる粉末を含む乾燥剤であって、
(1)前記被覆層が、カルボン酸及びその塩の少なくとも1種の被覆材を含み、
(2)前記粉末の平均粒子径が5μm以下であり、
(3)前記粉末により形成された面に対する水の接触角が20度以上である、
ことを特徴とする硫酸マグネシウム系乾燥剤。
2. 硫酸マグネシウムと被覆層との合計100重量部中、硫酸マグネシウムが85~99重量部及び被覆層1~15重量部である、前記項1に記載の硫酸マグネシウム系乾燥剤。
3. 前記被覆材が、炭素数5~20の飽和モノカルボン酸及びその塩の少なくとも1種を含む、前記項1に記載の硫酸マグネシウム系乾燥剤。
4. 前記被覆材が、ステアリン酸及びステアリン酸カルシウムの少なくとも1種を含む、前記項1に記載の硫酸マグネシウム系乾燥剤。
5. 硫酸マグネシウムが無水硫酸マグネシウムであって、吸湿時において硫酸マグネシウム・3水和物を生成し得る、前記項1に記載の硫酸マグネシウム系乾燥剤。
6. 前記項1~5のいずれかに記載の硫酸マグネシウム系乾燥剤と熱可塑性樹脂とを含む樹脂組成物。
7. 1)化学式MgSO4・nH2O(但し、0≦n≦3)で示される硫酸マグネシウム及び2)カルボン酸及びその塩の少なくとも1種の被覆材を含む混合原料を当該被覆材が可塑性を呈する温度以上で粉砕する工程を含むことを特徴とする硫酸マグネシウム系乾燥剤の製造方法。
8. 前記被覆材が、炭素数5~20の飽和モノカルボン酸及びその塩の少なくとも1種を含む、前記項7に記載の製造方法。
9. 前記被覆材が、ステアリン酸及びステアリン酸カルシウムの少なくとも1種を含む、前記項7に記載の製造方法。
10.前記項7~9のいずれかに記載の方法により製造される硫酸マグネシウム系乾燥剤。
本発明の硫酸マグネシウム系乾燥剤は、化学式MgSO4・nH2O(但し、0≦n≦3)で示される硫酸マグネシウムの粒子表面に被覆層が形成された被覆粒子からなる粉末を含む乾燥剤であって、
(1)前記被覆層が、カルボン酸及びその塩の少なくとも1種の被覆材を含み、
(2)前記粉末の平均粒子径が5μm以下であり、
(3)前記粉末により形成された面に対する水の接触角が20度以上である、
ことを特徴とする。
本発明の硫酸マグネシウム系乾燥剤は、上記の粒子構造(被覆層)が得られる限り、特に限定されないが、例えば下記の方法で製造することにより、より確実に本発明乾燥剤を得ることができる。すなわち、1)化学式MgSO4・nH2O(但し、0≦n≦3)で示される硫酸マグネシウム及び2)カルボン酸及びその塩の少なくとも1種の被覆材を含む混合原料を当該被覆材が可塑性を呈する温度以上(特に当該被覆材の融点以上の温度)で粉砕する工程を含むことを特徴とする製造方法によって硫酸マグネシウム系乾燥剤を得ることができる。
(1)平均粒子径
試料を超音波攪拌(周波数400Hz)した後にアセトン中に分散させてレーザー回折法によりアセトン中にて測定を行った。測定装置として「MICROTRAC HRA Model No.9320-X100」Honeywell社製を用いた。得られた粒度分布より、通過分積算10%の粒子径(D10)、通過分積算のメジアン径(D50)、通過分積算90%の粒子径(D90)、最大粒子径(Dtop)を求め、メジアン径を平均粒子径とした。
(2)粒子観察
走査型電子顕微鏡(「JSM-5500LV」日本電子製、15kv、5000倍)により観察した。
(3)比表面積
試料約50mgを前処理し(減圧下、105℃、1時間)、窒素ガス吸着法にて比表面積を測定した。測定装置として「高速比表面積・細孔分布測定装置 NOVA 4000e」 ユアサアイオニクス社製を用いた。
(4)接触角
『試料表面の調整』
内寸 W55mm×D24mm×H18.5mm の石英ガラスセル(容器)に試料を充填し、表面を平らに調整した。
『測定装置』
「Drop Master 701」協和界面科学株式会社製を用いた。
『液滴法接触角測定』
1mLのガラス注射筒に22G(内径0.4mm)のステンレス針を装着し、ガラス注射筒内に蒸留水を充填した。ガラス注射筒のピストンを徐々に押し出して、ステンレス針の先端に約4μLの水滴を形成した。
この水滴に試料表面を徐々に近づけ、CCDカメラにて撮影開始と同時に水滴と試料表面を接触させ、水滴を試料表面上に着液させた。
撮影した画像から試料表面上の水滴の輪郭形状を円の一部と近似し、図1に示した計算式をもとに、試料表面と水滴の接触点における接線とのなす角度を接触角(θ)として解析・算出した。
(5)飽和吸湿量及び吸湿速度
試料5gを恒温恒湿器(「KCL-2000」EYELA社製、温度20℃及び湿度90%RH)の中に配置し、配置後0時間後、0.5時間後、1時間後、1.5時間後、2時間後、3時間後、4時間後、6時間後、8時間後、10時間後、22時間後、34時間後、48時間後、121時間後及び144時間後の各吸湿量(試料1g当たりの重量増加g)を測定した。なお、無水硫酸マグネシウムの理論飽和吸湿量は1.05g/gである。
表1の「処理なし」として示す無水硫酸マグネシウム(平均粒子径12.5μm、BET比表面積3.7m2/g)99.0重量%とステアリン酸カルシウム(平均粒子径5.72μm)1.0重量%を含む混合粉末を衝撃式微粉砕機(粉砕機回転速度6000~7000rpm、分級機回転速度3000~4000rpm)を用い、乾式にて粉砕処理を実施した。得られた粉砕物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表1に示す。「処理なし」として示す無水硫酸マグネシウムは、接触角の測定において水滴と接触すると同時に吸水が起こり、試料表面上に水滴を保持することができず、接触角が得られなかったのに対し、実施例1で得られた試料は、32.4°の接触角を示し、明らかな疎水性の発現が認められた。
無水硫酸マグネシウム97.0重量%とステアリン酸カルシウム3.0重量%の合計100重量%としたほか、実施例1と同様にして粉砕処理を実施した。得られた粉砕物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表1に示す。実施例2で得られた試料は、84.4°の接触角を示し、明らかな疎水性の発現が認められた。
無水硫酸マグネシウム95.0重量%とステアリン酸カルシウム5.0重量%の合計100重量%としたほか、実施例1と同様にして粉砕処理を実施した。得られた粉砕物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表1に示す。実施例3で得られた試料は、113.2°の接触角を示し、明らかな疎水性の発現が認められた。
無水硫酸マグネシウム90.0重量%とステアリン酸カルシウム10.0重量%の合計100重量%としたほか、実施例1と同様にして粉砕処理を実施した。得られた粉砕物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表1に示す。実施例4で得られた試料は、122.1°の接触角を示し、明らかな疎水性の発現が認められた。
表1の「処理なし」として示す無水硫酸マグネシウム(平均粒子径12.5μm、BET比表面積3.7m2/g)を衝撃式微粉砕機(粉砕機回転速度6000~7000rpm、分級機回転速度3000~4000rpm)を用い、乾式にて粉砕処理を実施した。次いで、得られた粉砕無水硫酸マグネシウム99.0重量%とステアリン酸カルシウム(平均粒子径5.72μm)1.0重量%の合計100重量%を(粉砕することなく)混合することにより、混合物を得た。得られた混合物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表2に示す。比較例1で得られた試料は、「処理なし」として示す無水硫酸マグネシウムと同様に、接触角の測定において水滴と接触すると同時に吸水が起こり、試料表面上に水滴を保持することができず、接触角が得られなかった。
粉砕無水硫酸マグネシウム97.0重量%とステアリン酸カルシウム3.0重量%の合計100重量%として混合したほか、比較例1と同様にして混合物を調製した。得られた混合物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表2に示す。比較例2で得られた試料は、「処理なし」として示す無水硫酸マグネシウムと同様に、接触角の測定において水滴と接触すると同時に吸水が起こり、試料表面上に水滴を保持することができず、接触角が得られなかった。
粉砕無水硫酸マグネシウム95.0重量%とステアリン酸カルシウム5.0重量%の合計100重量%として混合したほか、比較例1と同様にして混合物を調製した。得られた混合物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表2に示す。比較例3で得られた試料は、「処理なし」として示す無水硫酸マグネシウムと同様に、接触角の測定において水滴と接触すると同時に吸水が起こり、試料表面上に水滴を保持することができず、接触角が得られなかった。
粉砕無水硫酸マグネシウム90.0重量%とステアリン酸カルシウム10.0重量%の合計100重量%として混合したほか、比較例1と同様にして混合物を調製した。得られた混合物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表2に示す。比較例4で得られた試料は、「処理なし」として示す無水硫酸マグネシウムと同様に、接触角の測定において水滴と接触すると同時に吸水が起こり、試料表面上に水滴を保持することができず、接触角が得られなかった。
各実施例及び比較例で得られた乾燥剤組成物、並びに「処理なし」として示す無水硫酸マグネシウム、ステアリン酸カルシウムの粒子外観を走査型電子顕微鏡にて確認した。その結果を図2~図4に示す。図2~図4中において、前記「処理なし」(無水硫酸マグネシウム粒子)は図2(a)、ステアリン酸カルシウム粒子は図2(b)、実施例1で得られた試料は図3(c)、実施例2で得られた試料は図3(d)、実施例3で得られた試料は図3(e)、実施例4で得られた試料は図3(f)、比較例1で得られた試料は図4(g)、比較例2で得られた試料は図4(h)、比較例3で得られた試料は図4(i)、比較例4で得られた試料は図4(j)にそれぞれ示す。これらの結果からも明らかなように、比較例の試料では、粒子表面に凹凸が多く、表面が粗くなっている。これに対し、実施例の試料では粒子表面が比較的滑らかになっていることがわかる。すなわち、本発明に係る硫酸マグネシウム粒子の表面全体にわたって被覆層によりほぼ均一に覆われていることがわかる。これは、ステアリン酸カルシウムの一部又は全部が変形又は融解して粒子表面にステアリン酸カルシウムの被覆層が展延し、被覆層が硫酸マグネシウム粒子の表面全体にわたってほぼ均一に覆ったことによるものと考えられる。
各実施例及び比較例で得られた乾燥剤組成物、並びに「処理なし」として示す無水硫酸マグネシウム、ステアリン酸カルシウムの吸湿速度を各時間における吸湿量(g/g)から求めた。その結果を表3及び図5に示す。
無水硫酸マグネシウム97.0重量%とステアリン酸3.0重量%の合計100重量%としたほか、実施例1と同様にして粉砕処理を実施した。得られた粉砕物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表4に示す。実施例5で得られた試料は72.1度の接触角を示し、良好な疎水性が確認された。
無水硫酸マグネシウム94.0重量%とステアリン酸6.0重量%の合計100重量%としたほか、実施例1と同様にして粉砕処理を実施した。得られた粉砕物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表4に示す。実施例6で得られた試料は128.6度の接触角を示し、高い疎水性を有していることが確認された。
無水硫酸マグネシウム90.0重量%とステアリン酸10.0重量%の合計100重量%としたほか、実施例1と同様にして粉砕処理を実施した。得られた粉砕物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表4に示す。実施例7で得られた試料は127.4度の接触角を示し、高い疎水性を有していることが確認された。
無水硫酸マグネシウム97.0重量%とステアリン酸マグネシウム3.0重量%の合計100重量%としたほか、実施例1と同様にして粉砕処理を実施した。得られた粉砕物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表5に示す。実施例8で得られた試料は141.3度の接触角を示し、高い疎水性を有していることが確認された。
無水硫酸マグネシウム94.0重量%とステアリン酸マグネシウム6.0重量%の合計100重量%としたほか、実施例1と同様にして粉砕処理を実施した。得られた粉砕物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表5に示す。実施例9で得られた試料は147.3度の接触角を示し、高い疎水性を有していることが確認された。
無水硫酸マグネシウム90.0重量%とステアリン酸マグネシウム10.0重量%の合計100重量%としたほか、実施例1と同様にして粉砕処理を実施した。得られた粉砕物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角、および飽和吸湿量を測定した。その結果を表5に示す。実施例10で得られた試料は151.6度の接触角を示し、高い疎水性を有していることが確認された。
無水硫酸マグネシウム97.0重量%とパルミチン酸3.0重量%の合計100重量%としたほか、実施例1と同様にして粉砕処理を実施した。得られた粉砕物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表6に示す。実施例11で得られた試料は124.7度の接触角を示し、高い疎水性を有していることが確認された。
無水硫酸マグネシウム94.0重量%とパルミチン酸6.0重量%の合計100重量%としたほか、実施例1と同様にして粉砕処理を実施した。得られた粉砕物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表6に示す。実施例12で得られた試料は109.2度の接触角を示し、高い疎水性を有していることが確認された。
無水硫酸マグネシウム90.0重量%とパルミチン酸10.0重量%の合計100重量%としたほか、実施例1と同様にして粉砕処理を実施した。得られた粉砕物について、粒子径として平均粒子径(D50)、D10、D90、最大粒子径(Dtop)、接触角及び飽和吸湿量を測定した。その結果を表6に示す。実施例13で得られた試料は86.4度の接触角を示し、良好な疎水性を有することが確認された。
Claims (10)
- 化学式MgSO4・nH2O(但し、0≦n≦3)で示される硫酸マグネシウムの粒子表面に被覆層が形成された被覆粒子からなる粉末を含む乾燥剤であって、
(1)前記被覆層が、カルボン酸及びその塩の少なくとも1種の被覆材を含み、
(2)前記粉末の平均粒子径が5μm以下であり、
(3)前記粉末により形成された面に対する水の接触角が20度以上である、
ことを特徴とする硫酸マグネシウム系乾燥剤。 - 硫酸マグネシウムと被覆層との合計100重量部中、硫酸マグネシウムが85~99重量部及び被覆層1~15重量部である、請求項1に記載の硫酸マグネシウム系乾燥剤。
- 前記被覆材が、炭素数5~20の飽和モノカルボン酸及びその塩の少なくとも1種を含む、請求項1に記載の硫酸マグネシウム系乾燥剤。
- 前記被覆材が、ステアリン酸及びステアリン酸カルシウムの少なくとも1種を含む、請求項1に記載の硫酸マグネシウム系乾燥剤。
- 硫酸マグネシウムが無水硫酸マグネシウムであって、吸湿時において硫酸マグネシウム・3水和物を生成し得る、請求項1に記載の硫酸マグネシウム系乾燥剤。
- 請求項1~5のいずれかに記載の硫酸マグネシウム系乾燥剤と熱可塑性樹脂とを含む樹脂組成物。
- 1)化学式MgSO4・nH2O(但し、0≦n≦3)で示される硫酸マグネシウム及び2)カルボン酸及びその塩の少なくとも1種の被覆材を含む混合原料を当該被覆材が可塑性を呈する温度以上で粉砕する工程を含むことを特徴とする硫酸マグネシウム系乾燥剤の製造方法。
- 前記被覆材が、炭素数5~20の飽和モノカルボン酸及びその塩の少なくとも1種を含む、請求項7に記載の製造方法。
- 前記被覆材が、ステアリン酸及びステアリン酸カルシウムの少なくとも1種を含む、前記項7に記載の製造方法。
- 請求項7~9のいずれかに記載の方法により製造される硫酸マグネシウム系乾燥剤。
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JP2012551427A JP5272260B1 (ja) | 2011-07-15 | 2012-07-13 | 硫酸マグネシウム系乾燥剤及びその製造方法 |
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JP2015526270A (ja) * | 2012-06-08 | 2015-09-10 | サエス・ゲッターズ・エッセ・ピ・ア | 感湿デバイスの製造及び保護に役立つ、表面改質された金属酸化物の粉末を含む乾燥剤組成物 |
JP5858311B1 (ja) * | 2015-01-23 | 2016-02-10 | 富田製薬株式会社 | 吸湿性無機フィラー含有ポリオレフィン組成物及びこれを用いた成型体 |
JP2016516261A (ja) * | 2013-11-21 | 2016-06-02 | エルジー・ケム・リミテッド | ゲッター材及びこれを含む吸湿性フィルム |
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