WO2011024919A1 - ハイドロタルサイト型粒子粉末、農業フィルム用保温剤、農業フィルム用マスターバッチ及び農業用フィルム - Google Patents
ハイドロタルサイト型粒子粉末、農業フィルム用保温剤、農業フィルム用マスターバッチ及び農業用フィルム Download PDFInfo
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- hydrotalcite
- particle powder
- type particle
- agricultural film
- aqueous solution
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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
- C01F5/14—Magnesium hydroxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/14—Greenhouses
- A01G9/1438—Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches
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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
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
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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
- C01F7/00—Compounds of aluminium
- C01F7/78—Compounds containing aluminium and two or more other elements, with the exception of oxygen and hydrogen
- C01F7/784—Layered double hydroxide, e.g. comprising nitrate, sulfate or carbonate ions as intercalating anions
- C01F7/785—Hydrotalcite
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
- C01G9/006—Compounds containing, besides zinc, two ore more other elements, with the exception of oxygen or hydrogen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
- C01G9/02—Oxides; Hydroxides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
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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
- C08L101/00—Compositions of unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/40—Compounds of aluminium
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/20—Two-dimensional structures
- C01P2002/22—Two-dimensional structures layered hydroxide-type, e.g. of the hydrotalcite-type
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/54—Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/11—Powder tap density
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/19—Oil-absorption capacity, e.g. DBP values
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
Definitions
- the present invention provides a heat insulating agent for agricultural film that exhibits excellent heat retention and transparency when incorporated in an agricultural film, an agricultural film masterbatch comprising the compound as an active ingredient, and an agricultural film. .
- Specific heat-insulating particles are compounds composed of colorless ions close to the refractive index of 1.45 to 1.55 of the resin in order to increase the daytime sunlight transmittance of agricultural films, the ground and plants Particles with high infrared absorption ability in the wavelength range of 5 to 30 ⁇ m, which is the energy distribution of infrared rays emitted from the particles, fine particles and good dispersibility so as not to impair mechanical strength when blended in agricultural films That is required.
- a smaller particle size is advantageous in order to be a hydrotalcite compound having excellent transparency when added to a resin.
- Patent Document 1 a technique for adjusting the bulk density by reducing the volume of hydrotalcite by vacuum degassing has been proposed.
- the conventional heat insulating agent for agricultural films satisfies the required heat retaining property, it causes a decrease in transparency when contained in a film.
- the heat-retaining agent is difficult to be applied to the resin, reducing the productivity of the masterbatch and increasing the adhesion to the equipment. .
- patent document 1 improves the fluidity
- the compatibility with the resin is not improved, and the transparency and the dispersibility in the resin when contained in the film are insufficient.
- Patent Document 2 The technique of Patent Document 2 is to coat the surface of hydrotalcite particles with an oxysilicate compound or a phosphoric acid compound to impart heat retention, but hydrotalcite itself is obtained by a conventionally known production method.
- the aspect ratio is high and good fluidity cannot be realized, and the dispersibility when contained in a film is insufficient.
- hydrotalcite-based heat insulating particles for agricultural films that have both transparency required for agricultural film heat insulating agents, dispersibility in resins and handling at a high level. To do.
- the present invention is a hydrotalcite-type particle powder having an oil absorption amount of 35 ml / 100 g or less and an oil absorption amount / plate surface diameter value of 140 to 190 (Invention 1).
- hydrotalcite-type particle powder according to claim 1, wherein the hydrotalcite-type particle powder is a compound represented by the following formula (1) (Invention 2).
- M 2+ in Formula is at least one metal element selected from the group consisting of Mg and Zn,
- a n-represents an n-valent anion, n represents the valence of the anion, 0.2 ⁇ x ⁇ 0.5, 0 ⁇ m ⁇ 1, and p x / n.
- the apparent density [rho a is hydrotalcite-type particles according to the present invention 1 or 2 is 0.25 g / cc or more (Invention 3).
- a hydrotalcite-type particles according to any one of Inventions 1 to 3, a tap density [rho t is at 0.55 g / cc or more (Invention 4).
- the hydrotalcite-type particle powder according to any one of the present inventions 1 to 4 having a plate surface diameter of 0.25 ⁇ m or less, a BET specific surface area of 30 m 2 / g or less, and an aspect ratio of 2.5 or less. (Invention 5).
- hydrotalcite-type particle powder according to any one of the present inventions 1 to 5 from which a part or all of the interlayer water has been removed (present invention 6).
- the present invention is an agricultural film heat insulating agent comprising the hydrotalcite-type particle powder according to any one of the present inventions 1 to 6 (present invention 7).
- the heat insulating agent for agricultural films using the hydrotalcite type particle powder according to the present invention achieves both transparency and dispersibility in a resin at a high level during film formation.
- the hydrotalcite type particle powder according to the present invention is a compound represented by the following formula (1).
- M 2+ in the formula (1) represents at least one metal element selected from the group consisting of Mg and Zn.
- a n ⁇ represents an n-valent anion, and n represents the valence of the anion.
- the types of anions (A n ⁇ ) contained in the hydrotalcite-type particle powder according to the present invention are hydroxide ions (OH ⁇ ), carbonate ions (CO 3 2 ⁇ ), and sulfate ions (SO 4 2 ⁇ ). Particularly preferred is carbonate ion.
- hydroxide ions OH ⁇
- carbonate ions CO 3 2 ⁇
- SO 4 2 ⁇ sulfate ions
- Particularly preferred is carbonate ion.
- an improvement in infrared absorption capability can be expected.
- the hydrotalcite-type particle powder according to the present invention has an oil absorption of 35 ml / 100 g or less, preferably 25 to 33 ml / 100 g.
- the oil absorption is a measure for judging the aggregation state of the hydrotalcite-type particles, that is, the formation of secondary particles.
- hydrotalcite-type particles are aggregated to form secondary particles, oil is absorbed in the gaps between the aggregated particles, so that the oil absorption is large, which means that the amount of secondary particles of hydrotalcite-type particles is large. That is, it means that the dispersibility of the hydrotalcite-type particles is poor and easy to aggregate.
- the ease with which the heat retaining agent particles can be applied to the resin can be determined to be more compatible with the resin as the value of the torque difference measured by the method in the examples described later is smaller, and the value of the torque difference is 0.21 kg ⁇ m or less. Preferably there is.
- the dispersibility of the hydrotalcite-type particles is preferably such that the average value of the number of aggregates of undispersed particles measured by the method in Examples described later is 4 or less (evaluation is ⁇ or ⁇ ).
- the hydrotalcite-type particle powder according to the present invention has an oil absorption amount / plate surface diameter value of 140 to 190.
- the value of oil absorption / plate surface diameter is less than 140, the plate surface diameter of the particles is large with respect to the amount of oil absorption, and transparency tends to be lowered when formed into a film.
- it exceeds 190 it becomes difficult for the particles to become familiar with the resin, resulting in poor dispersibility and poor productivity.
- a preferred value of oil absorption / plate surface diameter is 142 to 188, more preferably 145 to 185.
- the hydrotalcite-type particle powder according to the present invention is plate-like and preferably has a plate surface diameter of 0.25 ⁇ m or less. More preferably, it is 0.1 to 0.25 ⁇ m, and still more preferably 0.1 to 0.2 ⁇ m.
- the plate surface diameter is less than 0.1 ⁇ m, the dispersibility when kneaded into the resin tends to be insufficient.
- it exceeds 0.25 ⁇ m even if it can be uniformly dispersed in the resin, the transparency may be lowered.
- the hydrotalcite-type particle powder according to the present invention preferably has an apparent density ( ⁇ a ) of 0.25 g / cc or more. If it is less than 0.25 g / cc, the fluidity may be deteriorated. More preferably, it is 0.3 g / cc or more.
- the hydrotalcite-type particle powder according to the present invention preferably has a tap density ( ⁇ t ) of 0.55 g / cc or more. If it is less than 0.55 g / cc, the fluidity may be deteriorated. More preferably, it is 0.6 g / cc or more.
- the hydrotalcite-type particle powder according to the present invention preferably has a BET specific surface area of 30 m 2 / g or less. More preferably, it is 20 m 2 / g or less. When it exceeds 30 m 2 / g, it becomes fine particles and easily causes particle aggregation, which may cause poor dispersion.
- the lower limit of the BET specific surface area is about 5 m 2 / g.
- the hydrotalcite-type particle powder according to the present invention preferably has an aspect ratio of 2.5 or less.
- an isotropic particle shape having an aspect ratio of 2.5 or less the bulk density is increased and the fluidity is improved. More preferably, it is 1.0 to 2.4.
- the hydrotalcite-type particle powder according to the present invention is prepared by mixing an alkaline aqueous solution containing anions, a magnesium salt aqueous solution and an aluminum salt aqueous solution at a pH value of 9 to 12 and 80 to 100 ° C.
- a primary reaction for aging for generating intermediate product 1 which is Mg—Al-based hydrotalcite-type particles and added to an aqueous suspension containing intermediate product 1 at the time of generation of intermediate product 1
- the pH is 9 Aging in the range of ⁇ 12 and temperature range of 80 ⁇ 100 ° C for 1 ⁇ 3 hours to produce intermediate product 2 which is Mg-Al hydrotalcite type particles
- An aqueous suspension containing the secondary reaction and the intermediate product 2 is transferred to a hydrothermal reaction vessel and aged for 2 to 9 hours in a temperature range of pH 9 to 12, 120 to 160 ° C. to be treated.
- an Mg-Zn-Al hydrotalcite type containing a desired amount of zinc by adding a zinc salt aqueous solution as necessary. It is also possible to obtain particle powder.
- the alkaline aqueous solution containing anions in the present invention is preferably a mixed alkaline aqueous solution of an aqueous solution containing anions and an aqueous alkali hydroxide solution.
- a sodium carbonate aqueous solution is preferable.
- a sodium hydroxide aqueous solution is preferable.
- magnesium salt aqueous solution in the present invention a magnesium sulfate aqueous solution, a magnesium chloride aqueous solution, a magnesium nitrate aqueous solution and the like can be used, and a magnesium sulfate aqueous solution and a magnesium chloride aqueous solution are preferable.
- an aqueous zinc sulfate solution an aqueous zinc chloride solution, an aqueous zinc nitrate solution and the like can be used, and an aqueous zinc sulfate solution and an aqueous zinc chloride solution are preferred.
- an aluminum sulfate aqueous solution an aluminum chloride aqueous solution, an aluminum nitrate aqueous solution and the like can be used, and an aluminum sulfate aqueous solution and an aluminum chloride aqueous solution are preferable.
- the mixing order of the aqueous alkali solution, magnesium salt aqueous solution and aluminum salt aqueous solution containing anions is not particularly limited, and each aqueous solution may be mixed simultaneously.
- an aqueous solution in which a magnesium salt aqueous solution and an aluminum salt aqueous solution are mixed in advance is added to an alkaline aqueous solution containing anions.
- the aqueous solution may be added at one time or continuously dropped.
- the concentration in the reaction solution obtained by mixing the aqueous alkali solution, magnesium salt aqueous solution and aluminum salt aqueous solution containing the anion in the primary reaction is preferably 0.1 to 1.5 mol / l, more preferably 0.5 to 1.5 mol / l. 1.2 mol / l, the aluminum salt is preferably 0.1 to 1.0 mol / l, more preferably 0.2 to 0.8 mol / l, and the anion is preferably 0.1 to 1.5 mol / l, more The amount is preferably 0.2 to 1.2 mol / l, and the alkali hydroxide aqueous solution is preferably 0.5 to 8 mol / l, more preferably 1 to 6 mol / l.
- the molar ratio of magnesium to aluminum to be added is preferably 0.8 to 5.0, more preferably 0.9 to 4.5.
- the temperature during the ripening reaction in the primary reaction is 80 to 100 ° C., preferably 85 to 100 ° C. Hydrotalcite-type particles are produced even when the temperature is lower than 80 ° C., but become fine particles, and the intermediate product 1 having a plate surface size suitable for resin kneading cannot be obtained.
- the pH value during the ripening reaction in the primary reaction is 9 to 12, preferably 9.5 to 11.5.
- the pH value is less than 9, the intermediate product 1 having an appropriate thickness cannot be obtained.
- the pH value exceeds 12, the plate surface diameter tends to increase, and isotropically shaped particles cannot be obtained.
- the reaction time of the ripening reaction in the primary reaction is preferably 2 to 8 hours.
- the aging time is less than 2 hours, it is difficult to obtain the intermediate product 1 having a large plate surface diameter and an appropriate thickness. Also, aging over 8 hours is not economical.
- the intermediate product 1 obtained by the primary reaction preferably has a plate surface diameter of 0.04 to 0.20 ⁇ m, more preferably 0.10 to 0.20 ⁇ m, and a thickness of 0.01 to 0.07 ⁇ m. More preferably, it is 0.01 to 0.05 ⁇ m, the aspect ratio is preferably 4 or less, and the BET specific surface area value is preferably 8 to 70 m 2 / g.
- the total number of moles of magnesium and aluminum added is 0.25 to 0.5 relative to the total number of moles of magnesium and aluminum added in the primary reaction. Preferably, it is 0.3 to 0.4.
- the reaction is conducted at a concentration that can secure a certain amount of industrial yield, when the total number of moles of magnesium and aluminum added in the secondary reaction is less than 0.25 with respect to the total number of moles of the primary reaction, 1
- the slurry viscosity of the next reaction becomes very high, the stirring tends to be insufficient, and as a result, particles having a uniform particle size distribution cannot be obtained.
- it exceeds 0.5 a large amount of fine particles are precipitated, and particles having a uniform particle size distribution cannot be obtained.
- the order of adding the magnesium salt aqueous solution and the aluminum salt aqueous solution is not particularly limited, and each aqueous solution may be added simultaneously.
- an aqueous solution obtained by mixing a magnesium salt aqueous solution and an aluminum salt aqueous solution in advance is added.
- the concentration in the reaction solution obtained by mixing the magnesium salt aqueous solution and the aluminum salt aqueous solution in the secondary reaction is preferably 0.2 to 1.5 mol / l for the magnesium salt, more preferably 0.5 to 1.3 mol / l.
- the salt is preferably 0.1 to 1 mol / l, more preferably 0.15 to 0.5 mol / l.
- the molar ratio of magnesium to aluminum to be added (Mg / Al) is preferably 0.8 to 5.0, more preferably 0.9 to 4.5.
- the temperature during the ripening reaction in the secondary reaction is 80 to 100 ° C., preferably 85 to 100 ° C. Hydrotalcite-type particles are produced even at a temperature lower than 80 ° C., but become fine particles, and the intermediate product 2 having a plate surface diameter suitable for resin kneading cannot be obtained.
- the pH value during the ripening reaction in the secondary reaction is 9 to 12, preferably 9.5 to 11.5.
- the pH value is less than 9, the intermediate product 2 having an appropriate thickness cannot be obtained.
- the pH value exceeds 12, the plate surface diameter tends to increase, and isotropically shaped particles cannot be obtained.
- the reaction time of the ripening reaction in the secondary reaction is preferably 1 to 3 hours.
- the aging time is less than 1 hour, it is difficult to obtain the intermediate product 2 having a large plate surface diameter and an appropriate thickness. Also, aging over 3 hours is not economical.
- the intermediate product 2 obtained by the secondary reaction preferably has a plate surface diameter of 0.06 to 0.20 ⁇ m, more preferably 0.10 to 0.20 ⁇ m, and a thickness of 0.01 to 0.07 ⁇ m. More preferably, it is 0.02 to 0.06 ⁇ m, the aspect ratio is preferably 3 or less, and the BET specific surface area value is preferably 8 to 70 m 2 / g.
- the temperature during the ripening reaction in the hydrothermal reaction is 120 to 160 ° C., preferably 130 to 160 ° C.
- Hydrotalcite-type particles are produced even at temperatures lower than 120 ° C., but isotropic hydrotalcite-type treated particles having a plate diameter suitable for resin kneading and an appropriate thickness. Can't get.
- the pH value during the ripening reaction in the hydrothermal reaction is 9 to 12, preferably 9.5 to 11.5.
- the pH value is less than 9, isotropic hydrotalcite-type treated particles having a large plate surface diameter and an appropriate thickness cannot be obtained.
- the reaction time of the aging reaction in the hydrothermal reaction is preferably 2 to 9 hours.
- the aging time is less than 2 hours, it is difficult to obtain isotropic hydrotalcite-type treated particles having a large plate surface diameter and an appropriate thickness. Also, aging over 9 hours is not economical.
- the hydrotalcite-type treated particles obtained by the hydrothermal reaction preferably have a plate surface diameter of 0.25 ⁇ m or less, a thickness of 0.03 to 0.10 ⁇ m, an aspect ratio of 2.5 or less, and a BET
- the specific surface area value is preferably 8 to 50 m 2 / g.
- the hydrotalcite-type particles to be treated can be obtained by washing with water and drying by a conventional method.
- the obtained particle powder to be treated is preferably subjected to a lipophilic surface treatment in order to improve the dispersibility in the resin.
- a lipophilic surface treatment As the surface treatment agent, higher fatty acids, organosilane compounds, rosin and the like are used, and the particle surface can be coated by either dry surface treatment or wet surface treatment.
- an aqueous suspension obtained by dispersing hydrotalcite-type treated particle powder is used in the surface treatment agent described above.
- an aqueous solution in which any of them is completely dissolved and adjusting the water temperature to 20 to 90 ° C. and mixing and stirring, or if necessary, adjusting the pH value after mixing and stirring the hydrotalcite type
- the surface of the particles to be treated is coated with a higher fatty acid, an organic silane compound, rosin or the like, then filtered, washed with water, dried and pulverized.
- Higher fatty acids are higher fatty acids when wet surface treatment is performed: behenic acid, behenic acid, stearic acid, palmitic acid, myristic acid, lauric acid, 12-hydroxystearic acid, sodium stearate, sodium lauric acid benzenesulfonate Sodium oleate or the like can be used.
- behenic acid, behenic acid, stearic acid, palmitic acid, myristic acid, lauric acid, 12-hydroxystearic acid, oleic acid and the like can be used.
- the coating amount with higher fatty acid is preferably 0.2 to 20.0% by weight in terms of C with respect to the hydrotalcite type particle powder, more preferably 0.5 to 18.0% by weight.
- the coating amount is less than 0.2% by weight, the coating effect by higher fatty acids cannot be obtained. If it exceeds 20.0% by weight, the coating effect is saturated, so it is meaningless to coat more than necessary.
- decyltrimethoxysilane, ⁇ -aminopropyltriethoxysilane, ⁇ -aminopropyltrimethoxysilane, etc. can be used for both wet and dry surface treatment. Of these, decyltrimethoxysilane and ⁇ -aminopropyltriethoxysilane are preferred.
- the coating amount with the organic silane compound is preferably 0.2 to 18.0% by weight in terms of C with respect to the hydrotalcite type particle powder, more preferably. Is 0.4 to 16.5% by weight.
- the coating amount is less than 0.2% by weight, the coating effect by the organosilane compound cannot be obtained. If it exceeds 18.0% by weight, the coating effect is saturated, so there is no point in coating more than necessary.
- water-soluble rosin can be used when wet surface treatment is performed, and natural rosin, hydrogenated rosin or the like can be used when dry surface treatment is performed.
- the coating amount with rosins is preferably 0.2 to 25.0% by weight in terms of C with respect to the hydrotalcite particle powder, more preferably 0.5 to 20.0% by weight.
- the coating amount is less than 0.2% by weight, the coating effect by rosins cannot be obtained. If it exceeds 25.0% by weight, the coating effect is saturated, so it is meaningless to coat more than necessary.
- the surface treatment can be performed in one step or two steps. In the case of two steps, it is preferable to perform a dry surface treatment after the wet surface treatment.
- the hydrotalcite-type particle powder according to the present invention does not change its effect as a heat retaining agent even when part or all of the interlayer water is removed. Rather, by removing part or all of the interlayer water, foaming during resin kneading can be suppressed, leading to an improvement in productivity.
- the hydrotalcite-type particle powder from which part or all of the interlayer water has been removed preferably has a value of m in the above formula (1) of 0 to 0.6.
- Examples of the resin used in the master batch for agricultural films according to the present invention include polymers or copolymers of olefins such as ethylene, propylene, butene-1, and vinyl acetate, such as low density polyethylene and linear low density polyethylene.
- examples thereof include polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-butene-1 copolymer, ethylene-vinyl acetate copolymer, and ethylene- ⁇ -olefin copolymer.
- polyethylene, an ethylene- ⁇ -olefin copolymer, and an ethylene-vinyl acetate copolymer having a vinyl acetate content of 25% by weight or less are preferable in view of transparency, weather resistance, and cost.
- the composition of the resin used for the masterbatch may be the same resin as the dilution resin used when manufacturing the agricultural film according to the present invention, or a different resin. When different resins are used, it is preferable to consider various characteristics determined by the compatibility between the resins.
- the content of the hydrotalcite-type particle powder in the master batch for agricultural film according to the present invention is preferably 10 to 250 parts by weight, more preferably 20 to 220 parts by weight with respect to 100 parts by weight of the resin.
- the amount is less than 10 parts by weight, the melt viscosity at the time of resin kneading is insufficient, and it is difficult to achieve good dispersion mixing of the heat retaining agent.
- the amount exceeds 250 parts by weight, the resin is insufficient, which makes it difficult to disperse and mix the heat retaining agent, which is not preferable.
- Agricultural film masterbatch according to the present invention is prepared by mixing a resin and a heat-retaining agent in a mixer such as a ribbon blender, a Nauter mixer, a Henschel mixer, a super mixer, etc. It is produced by kneading and molding with a machine or the like and then cutting, or by kneading or molding and cutting the kneaded product obtained by kneading the above mixture with a Banbury mixer, a pressure kneader or the like.
- a mixer such as a ribbon blender, a Nauter mixer, a Henschel mixer, a super mixer, etc. It is produced by kneading and molding with a machine or the like and then cutting, or by kneading or molding and cutting the kneaded product obtained by kneading the above mixture with a Banbury mixer, a pressure kneader or the like.
- the pellet of the agricultural film masterbatch according to the present invention preferably has an average major axis of 1 to 6 mm, more preferably 2 to 5 mm.
- the average minor axis is preferably 2 to 5 mm, more preferably 2.5 to 4 mm.
- the average major axis is less than 1 mm, the workability of pellet production is poor, which is not preferable.
- the size exceeds 6 mm, the difference from the size of the dilution resin is large, and it becomes difficult to sufficiently disperse and mix.
- the pellet shape can be various, and can be processed into a granular shape such as an irregular shape or a spherical shape, a cylindrical shape, a flake shape, or the like.
- Examples of the resin used for the agricultural film according to the present invention include polymers or copolymers of olefins such as ethylene, propylene, butene-1, and vinyl acetate, such as polyethylene such as low density polyethylene and linear low density polyethylene, Examples thereof include polypropylene, ethylene-propylene copolymer, ethylene-butene-1 copolymer, ethylene-vinyl acetate copolymer, and ethylene- ⁇ -olefin copolymer. Of these, polyethylene, an ethylene- ⁇ -olefin copolymer, and an ethylene-vinyl acetate copolymer having a vinyl acetate content of 25% by weight or less are preferable in view of transparency, weather resistance, and cost.
- the agricultural film according to the present invention may have a laminated structure as necessary.
- the content of the hydrotalcite-type particle powder in the agricultural film according to the present invention is preferably 1 to 30 parts by weight, more preferably 2 to 25 parts by weight with respect to 100 parts by weight of the resin.
- the amount is less than 1 part by weight, the effect of improving the heat retaining performance is insufficient.
- it exceeds 30 parts by weight the transparency of the agricultural film is lowered, which is not preferable.
- the heat retention of the agricultural film according to the present invention is a heat retention index measured according to an evaluation method described later, and is preferably 70% or more, and more preferably 80% or more.
- the transparency of the agricultural film according to the present invention is evaluated by a haze value measured according to an evaluation method described later.
- the haze value is preferably 6.0% or less, and more preferably 5.0% or less.
- the hydrotalcite-type particle powder and resin according to the present invention are introduced into a blender such as a ribbon blender, a nauter mixer, a Banbury mixer, a super mixer, a Henschel mixer, etc. according to a conventional method.
- a blender such as a ribbon blender, a nauter mixer, a Banbury mixer, a super mixer, a Henschel mixer, etc.
- melt-kneading using an extruder, a Banbury mixer, a pressure kneader or the like and then forming into a film by a method such as an inflation method or a T-die method can be used.
- a master batch pellet in which a predetermined amount of the above-described resin and hydrotalcite-type particle powder is mixed may be prepared in advance, and the agricultural film may be manufactured using the pellet.
- An important point in the present invention is that a primary reaction for generating an intermediate product 1 which is hydrotalcite-type particles by a coprecipitation reaction, an aqueous magnesium salt solution and an aluminum salt in an aqueous suspension containing the intermediate product 1
- an intermediate product 2 which is a hydrotalcite-type particle having an isotropic shape having an appropriate thickness with respect to the plate surface diameter under normal pressure is obtained.
- the present inventor has a rapid growth of the plate surface of the intermediate product 1 produced by maintaining the pH at 12 or less in the primary reaction. I think that it was effective to suppress the above and make the balance between the plate surface diameter and the thickness isotropic.
- the hydrotalcite layer is epitaxially formed by coprecipitation of magnesium ions and aluminum ions added by the secondary reaction on the surface of the intermediate product 1 generated by the primary reaction, the pH is set to 12 as well. It is also important by the following that the particles can be grown while maintaining the isotropic shape of the intermediate product 1 obtained by the primary reaction.
- the pH when the pH is 12 or less, the growth in the plate surface direction is suppressed, and it was possible to grow to a size suitable for resin kneading while maintaining an isotropic shape. thinking.
- hydrotalcite-type particle powder and agricultural film according to the present invention were evaluated by the following methods.
- the constituent phase of the hydrotalcite-type particle powder was identified with a powder X-ray diffractometer (RINT-2500, manufactured by Rigaku Corporation). Measurement was performed under the conditions of a diffraction angle 2 ⁇ of 3 to 80 °, a step angle of 0.03 °, and an FT of 0.3 sec. Cu was used as the radiation source type.
- the index x is in the composition formula M 2+ 1-x Al x ( OH) 2 A n- p mH 2 O in the hydrotalcite-type particles, dissolved in the hydrotalcite-type particles of the acid, the plasma emission spectrometer ( It was determined by analysis using yttrium as an internal standard with Thermo Electron Co., Ltd. (iCAP6500).
- the plate surface diameter of the hydrotalcite-type particle powder is shown by the average value measured from a transmission electron micrograph.
- the transmission electron microscope used is “JEM-1200EX II (manufactured by JEOL)”.
- Hydrotalcite powder was dispersed with water or alcohol, and the solution was deposited on a mesh and dried to prepare an observation sample. Particles (200 points) with the plate surface adhering horizontally to the mesh in the observation sample were selected, the plate surface diameter was measured, and the average value was taken as the plate surface diameter.
- the thickness of the hydrotalcite-type particle powder is the average value of the values measured from the transmission electron micrograph, as with the plate surface diameter. Particles (100 points) with the plate surface adhering perpendicularly to the mesh in the observation sample were selected, the thickness was measured, and the average value was taken as the thickness. The aspect ratio is calculated from the plate surface diameter / thickness.
- the apparent density ( ⁇ a ) and the tap density ( ⁇ t ) were measured.
- the measuring method was based on JIS Z2504: 2000 and JIS Z2512: 2006.
- the specific surface area value is B. E. T.A. Measured by the method. As a measuring device, “Monosorb MS-21 (manufactured by QUANTA CHROME)” was used.
- the resin was mixed into a master batch by using a twin-screw kneader so that the hydrotalcite type heat retaining agent particle powder had a concentration of 40%.
- the kneading conditions were a preheating time of 10 minutes, a kneading temperature of 120 ° C., a rotational speed of 120 rpm, and a kneading time of 15 minutes, and kneading was performed with a Laboplast mill (manufactured by Toyo Seiki Seisakusho).
- the ease of adapting the heat-insulating particles to the resin was determined by calculating the difference between the maximum torque at the initial stage of kneading and the stable torque after 5 minutes from the start of kneading in the measured value of the lab plast mill torque. The smaller the value, the easier it is to get used to the resin.
- a master batch having a heat retention agent of 40% was press-molded by hot pressing to obtain a press film having a thickness of 100 ⁇ m.
- the pressurization conditions are a press temperature of 160 ° C., a press pressure of 150 kg weight / cm 2 , a press time of 1 minute, and a throughput of 0.8 g.
- the haze value (cloudiness) was measured with a haze meter.
- the heat retention was evaluated by a heat retention index.
- Fourier transform infrared spectrophotometer infrared absorption spectrum of the agricultural film using FTIR-8700 ((Ltd.) manufactured by Shimadzu Corporation) (measured every 1 cm -1 in the range of 2,000 ⁇ 400 cm -1, The corrected absorptivity of each wave number was obtained by correcting with a film thickness of 100 ⁇ m, and the relative black body radiant energy absorption rate was calculated by multiplying the corrected absorptivity by the relative black body radiant energy of 15 ° C. for each wave number.
- the relative black body radiant energy absorption rate of wave numbers was integrated, and the value was divided by the total relative black body radiant energy of 2,000 to 400 cm ⁇ 1 to obtain a heat retention index.
- the dispersibility in the resin exists in the range of 1 cm square when the above-mentioned press film having a film thickness of 100 ⁇ m is cut into 5 cm squares and marked with a lattice pattern at 1 cm intervals with an optical microscope. The average value of the number of aggregates of undispersed particles was evaluated.
- Example 1 200 ml of an aqueous sodium carbonate solution having a CO 3 2- ion concentration of 3.17 mol / l, 300 ml of an aqueous sodium hydroxide solution of 9.57 mol / l and 400 ml of water were mixed to make a total amount of 900 ml, and then kept at 60 ° C. Stir in the reaction vessel. A mixed solution of 350 ml of an aqueous magnesium sulfate solution having an Mg 2+ ion concentration of 2.07 mol / l and 50 ml of an aqueous aluminum sulfate solution having an Al 3+ ion concentration of 3 mol / l was added thereto, and 100 ml of water was further added.
- the obtained intermediate product 1 had a plate surface diameter of 0.08 ⁇ m and a specific surface area of 45.5 m 2 / g (primary reaction).
- a mixed solution of 150 ml of an aqueous magnesium sulfate solution having an Mg 2+ concentration of 1.94 mol / l, 20 ml of an aqueous aluminum sulfate solution having an Al 3+ ion concentration of 3 mol / l, and 130 ml of water was gradually added to the slurry over 30 minutes.
- the mixture was further aged for 1 hour at a pH value of 9.4 and 95 ° C. to produce a slurry containing a white precipitate.
- the intermediate product 2 obtained had a plate surface diameter of 0.10 ⁇ m and a specific surface area of 38.1 m 2 / g (secondary reaction).
- the ratio of the total number of moles of magnesium and aluminum added in the secondary reaction to the total number of moles of magnesium and aluminum added in the primary reaction is 0.4.
- This slurry was transferred to an autoclave reaction vessel and aged at a pH value of 9.8 and 145 ° C. for 5 hours to obtain a slurry containing a white precipitate (hydrothermal reaction).
- the white precipitate was filtered, washed with water, and dried at 120 ° C. to obtain white particle powder.
- the obtained hydrotalcite-type treated particles had a plate surface diameter of 0.20 ⁇ m, a thickness of 0.09 ⁇ m, and a specific surface area of 15.3 m 2 / g (solid content: 65.3 g / l).
- the molar amount of Mg with respect to Al was 2.4 times.
- the obtained hydrotalcite-type particle powder has an oil absorption of 32 ml / 100 g, a specific surface area of 11 m 2 / g, an aspect ratio of 2.2, ⁇ a of 0.34 g / cc, and ⁇ t of 0.64 g / cc. there were.
- the oil absorption / particle diameter was 160.
- hydrotalcite type particle powder was mixed with polyethylene resin (CX2001, manufactured by Sumitomo Chemical Co., Ltd.) using a twin-screw kneader so as to have a concentration of 40% to form a master batch.
- the difference between the maximum torque at the initial stage of kneading and the stable torque after 5 minutes was 0.17 kg ⁇ m.
- the obtained master batch was press-molded with a hot press to obtain a press film having a thickness of 100 ⁇ m.
- the haze value (cloudiness) of the film was 5.3, and the heat retention index was 93.4.
- the haze value of a blank film is 0.5.
- the dispersibility was (circle).
- Example 2 Hydrotalcite-type particle powder 100 g surface-treated with stearic acid obtained in Example 1 and 1 g of stearic acid were placed in a Taninaka grinder and pulverized and mixed for 5 minutes. The hydrotalc coated with stearic acid Site-type particle powder was obtained.
- the obtained hydrotalcite-type particle powder has an oil absorption of 31 ml / 100 g, a specific surface area of 11 m 2 / g, an aspect ratio of 2.2, ⁇ a of 0.32 g / cc, and ⁇ t of 0.62 g / cc. there were.
- the oil absorption / particle diameter was 155.
- the torque difference during the kneading of the polyethylene resin was 0.15 kg ⁇ m, the haze of the film was 5.4, the heat retention index was 93.3, and the dispersibility was ⁇ .
- Example 3 100 g of hydrotalcite-type particle powder surface-treated with stearic acid obtained in Example 1 and 1.5 g of lauric acid were placed in a Taninaka grinder and pulverized and mixed for 5 minutes, and coated with lauric acid. Hydrotalcite-type particle powder was obtained.
- the obtained hydrotalcite-type particle powder has an oil absorption of 28 ml / 100 g, a specific surface area of 11 m 2 / g, an aspect ratio of 2.2, ⁇ a of 0.34 g / cc, and ⁇ t of 0.62 g / cc. there were.
- the oil absorption / particle diameter was 140.
- the difference in torque during kneading of the polyethylene resin was 0.09 kg ⁇ m, the haze of the film was 5.3, the heat retention index was 93.5, and the dispersibility was ⁇ .
- Example 4 In the hydrothermal reaction of Example 1, when the pH value was 9.6 and aged at 140 ° C. for 4 hours, a slurry containing a white precipitate was obtained. The white precipitate was filtered, washed with water, and dried at 120 ° C. to obtain white particle powder. As a result of identifying this white particle powder, it was recognized that it was a hydrotalcite type particle powder.
- the obtained hydrotalcite-type treated particles had a plate surface diameter of 0.18 ⁇ m, a thickness of 0.08 ⁇ m, and a specific surface area of 17.4 m 2 / g (solid content: 65.3 g / l). Moreover, the molar amount of Mg with respect to Al was 2.4 times.
- Sodium stearate 4.30 g was added to 300 ml of warm water and completely dissolved.
- the surface treatment was carried out by transferring 1.53 l of the slurry taken out from the autoclave reaction vessel to another reaction vessel, adding sodium stearate aqueous solution while keeping it at 65 ° C. and stirring, and keeping it for 20 minutes.
- the slurry was filtered, washed with water, and dried at 120 ° C. to obtain hydrotalcite-type particles surface-treated with stearic acid.
- the obtained hydrotalcite-type particles and 1.04 g of lauric acid were put in a Taninaka grinder and pulverized and mixed for 5 minutes to obtain hydrotalcite-type particle powder coated with lauric acid.
- the obtained hydrotalcite-type particle powder has an oil absorption of 33 ml / 100 g, a specific surface area of 14 m 2 / g, an aspect ratio of 2.3, ⁇ a of 0.31 g / cc, and ⁇ t of 0.62 g / cc. there were.
- the oil absorption / particle diameter was 183.
- the torque difference during resin kneading was 0.08 kg ⁇ m, the haze of the film was 5.5, the heat retention index was 93.5, and the dispersibility was ⁇ .
- Example 5 The hydrotalcite-treated particle powder obtained by filtering and washing the slurry after the hydrothermal reaction of Example 1 was placed in an electric furnace set at 260 ° C. for 2 hours to remove all interlayer water. 100 g of hydrotalcite-type particles from which interlayer water was removed and 3.5 g of stearic acid were placed in a Taninaka pulverizer and pulverized and mixed for 5 minutes to obtain dehydrated particles of hydrotalcite coated with stearic acid.
- the obtained hydrotalcite-type particle powder has an oil absorption of 34 ml / 100 g, a specific surface area of 11 m 2 / g, an aspect ratio of 2.5, ⁇ a of 0.32 g / cc, and ⁇ t of 0.60 g / cc. there were.
- the oil absorption / particle diameter was 140.
- the difference in torque during kneading of the polyethylene resin was 0.19 kg ⁇ m, the haze of the film was 5.6, the heat retention index was 95.4, and the dispersibility was ⁇ .
- Example 6 200 ml of a sodium carbonate aqueous solution having a CO 3 2- ion concentration of 2.82 mol / l, 300 ml of a 9.28 mol / l sodium hydroxide aqueous solution and 400 ml of water were mixed to make a total amount of 900 ml, and then kept at 60 ° C. Stir in the reaction vessel. To this, a mixed solution of 350 ml of magnesium sulfate aqueous solution having an Mg 2+ ion concentration of 2.07 mol / l and 50 ml of aluminum sulfate aqueous solution having an Al 3+ ion concentration of 2.68 mol / l was added, and 100 ml of water was further added.
- the obtained intermediate product 1 had a plate surface diameter of 0.10 ⁇ m and a specific surface area of 37.3 m 2 / g (primary reaction).
- a mixed solution of 150 ml of magnesium sulfate aqueous solution with an Mg 2+ concentration of 1.93 mol / l, 20 ml of aluminum sulfate aqueous solution with an Al 3+ ion concentration of 2.7 mol / l, and 130 ml of water is gradually added to the slurry over 30 minutes. did.
- the mixture was further aged for 1 hour at a pH value of 9.7 and 95 ° C. to produce a slurry containing a white precipitate.
- the intermediate product 2 obtained had a plate surface diameter of 0.12 ⁇ m and a specific surface area of 34.1 m 2 / g (secondary reaction).
- the ratio of the total number of moles of magnesium and aluminum added in the secondary reaction to the total number of moles of magnesium and aluminum added in the primary reaction is 0.4.
- the slurry was transferred to an autoclave reaction vessel and aged at pH 9.8 and 140 ° C. for 5 hours to obtain a slurry containing a white precipitate (hydrothermal reaction).
- the white precipitate was filtered, washed with water, and dried at 120 ° C. to obtain white particle powder.
- the obtained hydrotalcite-type treated particles had a plate surface diameter of 0.20 ⁇ m, a thickness of 0.09 ⁇ m, and a specific surface area of 14.9 m 2 / g (solid content 62.5 g / l).
- the molar amount of Mg with respect to Al was 2.7 times.
- the obtained hydrotalcite-type particle powder has an oil absorption of 32 ml / 100 g, a specific surface area of 11 m 2 / g, an aspect ratio of 2.2, ⁇ a of 0.34 g / cc, and ⁇ t of 0.64 g / cc. there were.
- the oil absorption / particle diameter was 160.
- the torque difference during kneading of the polyethylene resin was 0.17 kg ⁇ m, the haze of the film was 4.3, the heat retention index was 94.0, and the dispersibility was ⁇ .
- Example 7 200 ml of an aqueous solution of sodium carbonate having a CO 3 2- ion concentration of 3.01 mol / l, 300 ml of an aqueous solution of sodium hydroxide having an amount of 11.2 mol / l and 400 ml of water were mixed to bring the total amount to 900 ml, and then maintained at 60 ° C. Stir in the reaction vessel. Add a mixed solution of 350 ml of magnesium sulfate aqueous solution with Mg 2+ ion concentration of 2.46 mol / l and 50 ml of aqueous solution of aluminum sulfate with Al 3+ ion concentration of 2.9 mol / l, add 100 ml of water, 1.4 l.
- the obtained intermediate product 1 had a plate surface diameter of 0.10 ⁇ m and a specific surface area of 37.2 m 2 / g (primary reaction).
- This slurry was transferred to an autoclave reaction vessel and aged at a pH value of 10.7 and 135 ° C. for 5 hours to obtain a slurry containing a white precipitate.
- the white precipitate was filtered, washed with water, and dried at 120 ° C. to obtain a white particle powder (hydrothermal reaction).
- hydrotalcite type particle powder As a result of identifying this white particle powder, it was recognized that it was a hydrotalcite type particle powder.
- the obtained hydrotalcite-type treated particles had a plate surface diameter of 0.19 ⁇ m, a thickness of 0.09 ⁇ m, and a specific surface area of 15.9 m 2 / g (solid content: 71.4 g / l).
- the molar amount of Mg with respect to Al was 3 times.
- the obtained hydrotalcite-type particle powder has an oil absorption of 32 ml / 100 g, a specific surface area of 11 m 2 / g, an aspect ratio of 2.2, ⁇ a of 0.34 g / cc, and ⁇ t of 0.64 g / cc. there were.
- the oil absorption / particle diameter was 160.
- the difference in torque during kneading of the polyethylene resin was 0.17 kg ⁇ m, the haze of the film was 3.7, the heat retention index was 94.3, and the dispersibility was ⁇ .
- Example 8 200 ml of a sodium carbonate aqueous solution having a CO 3 2- ion concentration of 3.62 mol / l, 300 ml of a 10.1 mol / l sodium hydroxide aqueous solution and 400 ml of water were mixed to make a total amount of 900 ml, and then maintained at 60 ° C., Stir in the reaction vessel.
- This slurry was transferred to an autoclave reaction vessel and aged at a pH value of 9.8 and 145 ° C. for 5 hours to obtain a slurry containing a white precipitate (hydrothermal reaction).
- the white precipitate was filtered, washed with water, and dried at 120 ° C. to obtain white particle powder.
- the obtained hydrotalcite-type treated particles had a plate surface diameter of 0.20 ⁇ m, a thickness of 0.1 ⁇ m, and a specific surface area of 15.1 m 2 / g (solid content 68.3 g / l).
- the molar amount of Mg with respect to Al was 2.1 times.
- the obtained hydrotalcite-type particle powder has an oil absorption of 32 ml / 100 g, a specific surface area of 11 m 2 / g, an aspect ratio of 2.2, ⁇ a of 0.34 g / cc, and ⁇ t of 0.64 g / cc. there were.
- the oil absorption / particle diameter was 160.
- the torque difference during kneading of the polyethylene resin was 0.17 kg ⁇ m, the haze of the film was 5.9, the heat retention index was 93.0, and the dispersibility was ⁇ .
- Example 9 Using a biaxial kneader so that the hydrotalcite-type particle powder coated with lauric acid obtained in Example 1 has a concentration of 40%, EVA resin (PES-400 VA content 15% manufactured by Nihon Unicar) was used. Mix to make a masterbatch. The difference between the maximum torque at the initial stage of kneading and the stable torque after 5 minutes was 0.16 kg ⁇ m, the haze of the film was 8.6, the heat retention index was 96.8, and the dispersibility was ⁇ . The haze of the blank film is 0.9.
- EVA resin PES-400 VA content 15% manufactured by Nihon Unicar
- Example 10 When 10 ml of 1.5 mol / l sodium hydroxide was added to 300 ml of water and heated to 60 ° C., 2.5 g of lauric acid was added and completely dissolved with stirring. The surface treatment was carried out by transferring 1.53 l of the slurry obtained after the hydrothermal reaction in Example 1 to another reaction vessel, adding the lauric acid aqueous solution while maintaining the stirring at 65 ° C., and maintaining for 20 minutes. Went. The slurry was filtered, washed with water, and dried at 120 ° C. to obtain hydrotalcite-type particles surface-treated with lauric acid. The obtained hydrotalcite type particles and 1.03 g of stearic acid were put in a Taninaka grinder and pulverized and mixed for 5 minutes to obtain hydrotalcite type particle powder coated with stearic acid.
- the obtained hydrotalcite-type particle powder has an oil absorption of 35 ml / 100 g, a specific surface area of 11 m 2 / g, an aspect ratio of 2.2, ⁇ a of 0.33 g / cc, and ⁇ t of 0.63 g / cc. there were.
- the oil absorption / particle diameter was 175.
- the torque difference during kneading of the polyethylene resin was 0.21 kg ⁇ m, the haze of the film was 5.6, the heat retention index was 93.4, and the dispersibility was ⁇ .
- Example 11 When 10 ml of 1.5 mol / l sodium hydroxide was added to 300 ml of water and heated to 60 ° C., 3.7 g of 12 hydroxystearic acid was added and completely dissolved with stirring. Transfer 1.53 l of the slurry obtained after hydrothermal reaction in Example 1 to another reaction vessel, add 12 hydroxystearic acid aqueous solution while maintaining at 65 ° C. and stirring, and hold for 20 minutes, Surface treatment was performed. The slurry was filtered, washed with water, and dried at 120 ° C. to obtain hydrotalcite-type particles surface-treated with 12 hydroxystearic acid. The obtained hydrotalcite-type particles and 1.04 g of lauric acid were put in a Taninaka grinder and pulverized and mixed for 5 minutes to obtain hydrotalcite-type particle powder coated with lauric acid.
- the obtained hydrotalcite-type particle powder has an oil absorption of 34 ml / 100 g, a specific surface area of 11 m 2 / g, an aspect ratio of 2.2, ⁇ a of 0.32 g / cc, and ⁇ t of 0.63 g / cc. there were.
- the oil absorption / particle diameter was 170.
- the torque difference during kneading of the polyethylene resin was 0.2 kg ⁇ m, the haze of the film was 5.7, the heat retention index was 93.3, and the dispersibility was ⁇ .
- Example 12 100 g of hydrotalcite-type particle powder surface-treated with stearic acid obtained in Example 1 and 1 g of 12 hydroxystearic acid were placed in a Taninaka grinder and pulverized and mixed for 5 minutes, and coated with stearic acid. Hydrotalcite-type particle powder was obtained.
- the obtained hydrotalcite-type particle powder has an oil absorption of 34 ml / 100 g, a specific surface area of 11 m 2 / g, an aspect ratio of 2.2, ⁇ a of 0.33 g / cc, and ⁇ t of 0.64 g / cc. there were.
- the oil absorption / particle diameter was 170.
- the torque difference during kneading of the polyethylene resin was 0.18 kg ⁇ m, the haze of the film was 5.3, the heat retention index was 93.3, and the dispersibility was ⁇ .
- Comparative Example 1 200 ml of a sodium carbonate aqueous solution with a CO 3 2- ion concentration of 3.17 mol / l, 450 ml of a 10 mol / l aqueous sodium hydroxide solution and 250 ml of water were mixed to make a total volume of 900 ml, and then kept at 60 ° C. Stir in. A mixed solution of 350 ml of an aqueous magnesium sulfate solution having an Mg 2+ ion concentration of 2.07 mol / l and 50 ml of an aqueous aluminum sulfate solution having an Al 3+ ion concentration of 3 mol / l was added thereto, and 100 ml of water was further added.
- the obtained hydrotalcite-type particle powder has an oil absorption of 48 ml / 100 g, a specific surface area of 60 m 2 / g, an aspect ratio of 2.5, ⁇ a of 0.15 g / cc, and ⁇ t of 0.29 g / cc. there were.
- the oil absorption / particle diameter was 1067.
- the torque difference during kneading of the polyethylene resin was 0.30 kg ⁇ m, the haze of the film was 9.8, the heat retention index was 92.9, and the dispersibility was x.
- Comparative Example 2 The reaction time of the primary reaction of Example 1 was set to 3.5 hours, and thereafter, the secondary reaction was performed in the same manner to produce a slurry containing a white precipitate.
- the white precipitate was filtered, washed with water, and dried at 120 ° C. to obtain white particle powder.
- the obtained hydrotalcite-type particles had a plate surface diameter of 0.07 ⁇ m and a specific surface area of 39 m 2 / g (solid content: 65.3 g / l).
- the molar amount of Mg with respect to Al was 2.4 times.
- the obtained hydrotalcite-type particle powder has an oil absorption of 44 ml / 100 g, a specific surface area of 37 m 2 / g, an aspect ratio of 2.7, ⁇ a of 0.17 g / cc, and ⁇ t of 0.32 g / cc. there were.
- the oil absorption / particle diameter was 629.
- the torque difference during kneading of the polyethylene resin was 0.28 kg ⁇ m, the haze of the film was 9.5, the heat retention index was 93.0, and the dispersibility was x.
- Comparative Example 3 200 ml of an aqueous sodium carbonate solution having a CO 3 2- ion concentration of 3.17 mol / l, 300 ml of an aqueous sodium hydroxide solution of 9.57 mol / l and 400 ml of water were mixed to make a total amount of 900 ml, and then kept at 30 ° C. Stir in the reaction vessel. To this, a mixed solution of 500 ml of magnesium sulfate aqueous solution having an Mg 2+ ion concentration of 2.03 mol / l and 200 ml of aluminum sulfate aqueous solution having an Al 3+ ion concentration of 1.06 mol / l was added. 1.7 l.
- This slurry was transferred to an autoclave reaction vessel and aged at a pH value of 10.0 and 140 ° C. for 3 hours to obtain a slurry containing a white precipitate.
- the white precipitate was filtered, washed with water, and dried at 120 ° C. to obtain white particle powder.
- the obtained hydrotalcite-type particles had a plate surface diameter of 0.26 ⁇ m, a thickness of 0.05 ⁇ m, and a specific surface area of 17.3 m 2 / g (solid content: 65.3 g / l).
- the molar amount of Mg with respect to Al was 2.4 times.
- the obtained hydrotalcite-type particle powder has an oil absorption of 36 ml / 100 g, a specific surface area of 15 m 2 / g, an aspect ratio of 5.2, ⁇ a of 0.23 g / cc, and ⁇ t of 0.52 g / cc. there were.
- the oil absorption / particle diameter was 138.
- the torque difference during kneading of the polyethylene resin was 0.23 kg ⁇ m, the haze of the film was 8.7, the heat retention index was 93.3, and the dispersibility was ⁇ .
- Comparative Example 4 The reaction conditions in the hydrothermal reaction of Example 1 were performed at pH values of 10.0 and 160 ° C. for 6 hours to obtain a slurry containing a white precipitate. The white precipitate was filtered, washed with water, and dried at 120 ° C. to obtain white particle powder. As a result of identifying this white particle powder, it was recognized that it was a hydrotalcite type particle powder.
- the obtained hydrotalcite-type particles had a plate surface diameter of 0.24 ⁇ m, a thickness of 0.084 ⁇ m, and a specific surface area of 13.2 m 2 / g (solid content: 65.3 g / l). Moreover, the molar amount of Mg with respect to Al was 2.4 times.
- the obtained hydrotalcite-type particle powder has an oil absorption of 39 ml / 100 g, a specific surface area of 9 m 2 / g, an aspect ratio of 2.9, ⁇ a of 0.21 g / cc, and ⁇ t of 0.49 g / cc. there were.
- the oil absorption / particle diameter was 163.
- the torque difference during kneading of the polyethylene resin was 0.25 kg ⁇ m, the haze of the film was 8.8, the heat retention index was 93.2, and the dispersibility was ⁇ .
- Comparative Example 5 DHT-4A manufactured by Kyowa Chemical Industry Co., Ltd. was used as Comparative Example 5.
- Comparative Example 6 HT-P manufactured by Sakai Chemical Industry Co., Ltd. was designated as Comparative Example 6.
- Table 1 shows the synthesis conditions of Examples and Comparative Examples, and Table 2 shows various characteristics of the obtained hydrotalcite-type particle powder.
- the hydrotalcite-type particle powder according to the present invention does not decrease transparency when contained in an agricultural film, has good compatibility with a resin, and has a very high dispersibility. It is suitably used as an agent.
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Abstract
Description
0≦m≦1
p=x/n
本発明において重要な点は、共沈反応によりハイドロタルサイト型粒子である中間生成物1を生成させる1次反応と、該中間生成物1を含有する水性懸濁液にマグネシウム塩水溶液とアルミニウム塩水溶液を添加し熟成する2次反応を行うことにより、常圧下で板面径に対して適度な厚みを有する、等方的な形状のハイドロタルサイト型粒子である中間生成物2を得た上で、さらに水熱反応を行うことにより等方的な形状を保ちながら、樹脂分散に適した大きさまで成長させたハイドロタルサイト型粒子を得ることである。
△・・・2個~4個
×・・・5個以上
CO3 2-イオン濃度が3.17mol/lの炭酸ナトリウム水溶液200mlと9.57mol/lの水酸化ナトリウム水溶液300ml及び水400mlを混合し、全量を900mlとした後、60℃に保持して、反応容器中で撹拌しておく。ここに、Mg2+イオン濃度が2.07mol/lの硫酸マグネシウム水溶液350mlとAl3+イオン濃度が3mol/lの硫酸アルミニウム水溶液50mlの混合溶液を添加し、さらに水を100ml加えて、全量を1.4lとした。添加し終わったら加温し、pH値が10.7、95℃で5時間熟成して白色沈殿物を含むスラリーを生成した。得られた中間生成物1の板面径は0.08μm、比表面積は45.5m2/gであった(1次反応)。
実施例1で得られた、ステアリン酸で表面処理されたハイドロタルサイト型粒子粉末100gと、ステアリン酸1gをタニナカ式粉砕機に入れ、5分間粉砕混合して、ステアリン酸で被覆されたハイドロタルサイト型粒子粉末を得た。
実施例1で得られた、ステアリン酸で表面処理されたハイドロタルサイト型粒子粉末100gと、ラウリン酸1.5gをタニナカ式粉砕機に入れ、5分間粉砕混合して、ラウリン酸で被覆されたハイドロタルサイト型粒子粉末を得た。
実施例1の水熱反応において、pH値が9.6、140℃で4時間熟成したところ、白色沈殿物を含むスラリーを得た。この白色沈殿物を濾過、水洗の後、120℃にて乾燥することにより白色粒子粉末を得た。この白色粒子粉末を同定した結果、ハイドロタルサイト型粒子粉末であることが認められた。得られたハイドロタルサイト型被処理粒子の板面径は0.18μm、厚みは0.08μm、比表面積は17.4m2/gであった(固形分量65.3g/l)。また、Alに対するMgのモル量は2.4倍であった。
実施例1の水熱反応後のスラリーを濾過、水洗して得られた、ハイドロタルサイト被処理粒子粉末を、260℃に設定した電気炉に2時間入れて層間水の全てを除去した。層間水を除去したハイドロタルサイト型粒子100gとステアリン酸3.5gを、タニナカ式粉砕機に入れ、5分間粉砕混合して、ステアリン酸で被覆されたハイドロタルサイトの脱水粒子粉末を得た。
CO3 2-イオン濃度が2.82mol/lの炭酸ナトリウム水溶液200mlと9.28mol/lの水酸化ナトリウム水溶液300ml及び水400mlを混合し、全量を900mlとした後、60℃に保持して、反応容器中で撹拌しておく。ここに、Mg2+イオン濃度が2.07mol/lの硫酸マグネシウム水溶液350mlとAl3+イオン濃度が2.68mol/lの硫酸アルミニウム水溶液50mlの混合溶液を添加し、さらに水を100ml加えて、全量を1.4lとした。添加し終わったら加温し、pH値が10.5、95℃で3.5時間熟成して白色沈殿物を含むスラリーを生成した。得られた中間生成物1の板面径は0.10μm、比表面積は37.3m2/gであった(1次反応)。
CO3 2-イオン濃度が3.01mol/lの炭酸ナトリウム水溶液200mlと11.2mol/lの水酸化ナトリウム水溶液300ml及び水400mlを混合し、全量を900mlとした後、60℃に保持して、反応容器中で撹拌しておく。ここに、Mg2+イオン濃度が2.46mol/lの硫酸マグネシウム水溶液350mlとAl3+イオン濃度が2.9mol/lの硫酸アルミニウム水溶液50mlの混合溶液を添加し、さらに水を100ml加えて、全量を1.4lとした。添加し終わったら加温し、pH値が10.7、95℃で3時間熟成して白色沈殿物を含むスラリーを生成した。得られた中間生成物1の板面径は0.10μm、比表面積は37.2m2/gであった(1次反応)。
CO3 2-イオン濃度が3.62mol/lの炭酸ナトリウム水溶液200mlと10.1mol/lの水酸化ナトリウム水溶液300ml及び水400mlを混合し、全量を900mlとした後、60℃に保持して、反応容器中で撹拌しておく。ここに、Mg2+イオン濃度が2.07mol/lの硫酸マグネシウム水溶液350mlとAl3+イオン濃度が3.45mol/lの硫酸アルミニウム水溶液50mlの混合溶液を添加し、さらに水を100ml加えて、全量を1.4lとした。添加し終わったら加温し、pH値が10.7、95℃で5時間熟成して白色沈殿物を含むスラリーを生成した。得られた中間生成物1の板面径は0.10μm、比表面積は36.9m2/gであった(1次反応)。
実施例1で得られたラウリン酸で被覆されたハイドロタルサイト型粒子粉末を40%濃度になるように2軸混練機を用いて、EVA樹脂(日本ユニカー製 PES-400 VAコンテント15%)を混ぜてマスターバッチ化した。混練初期の最大トルクと5分経過後の安定したトルクの差は0.16kg・mで、フィルムのヘイズは8.6、保温性指数は96.8、分散性は○であった。なお、ブランクフィルムのヘイズは0.9である。
300mlの水に1.5mol/lの水酸化ナトリウム10mlを加えて60℃に加温したところに、ラウリン酸2.5gを加えて撹拌しながら完全に溶解させた。実施例1で水熱反応後に得られたスラリー1.53lを別の反応容器に移し、65℃に保持して撹拌しながら、ラウリン酸水溶液を添加して、20分間保持することによって、表面処理を行った。スラリーを濾過、水洗の後、120℃にて乾燥することにより、ラウリン酸によって表面処理されたハイドロタルサイト型粒子を得た。得られたハイドロタルサイト型粒子とステアリン酸1.03gをタニナカ式粉砕機に入れ、5分間粉砕混合して、ステアリン酸で被覆されたハイドロタルサイト型粒子粉末を得た。
300mlの水に1.5mol/lの水酸化ナトリウム10mlを加えて60℃に加温したところに、12ヒドロキシステアリン酸3.7gを加えて撹拌しながら完全に溶解させた。実施例1で水熱反応後に得られたスラリー1.53lを別の反応容器に移し、65℃に保持して撹拌しながら、12ヒドロキシステアリン酸水溶液を添加して、20分間保持することによって、表面処理を行った。スラリーを濾過、水洗の後、120℃にて乾燥することにより、12ヒドロキシステアリン酸によって表面処理されたハイドロタルサイト型粒子を得た。得られたハイドロタルサイト型粒子とラウリン酸1.04gをタニナカ式粉砕機に入れ、5分間粉砕混合して、ラウリン酸で被覆されたハイドロタルサイト型粒子粉末を得た。
実施例1で得られた、ステアリン酸で表面処理されたハイドロタルサイト型粒子粉末100gと、12ヒドロキシステアリン酸1gをタニナカ式粉砕機に入れ、5分間粉砕混合して、ステアリン酸で被覆されたハイドロタルサイト型粒子粉末を得た。
CO3 2-イオン濃度が3.17mol/lの炭酸ナトリウム水溶液200mlと10mol/lの水酸化ナトリウム水溶液450ml及び水250mlを混合し、全量を900mlとした後、60℃に保持して、反応容器中で撹拌しておく。ここに、Mg2+イオン濃度が2.07mol/lの硫酸マグネシウム水溶液350mlとAl3+イオン濃度が3mol/lの硫酸アルミニウム水溶液50mlの混合溶液を添加し、さらに水を100ml加えて、全量を1.4lとした。添加し終わったら加温し、pH値が12.5、65℃で5時間熟成して白色沈殿物を含むスラリーを生成した。この白色沈殿物を濾過、水洗の後、120℃にて乾燥することにより白色粒子粉末を得た。この白色粒子粉末を同定した結果、ハイドロタルサイト型粒子粉末であることが認められた。得られたハイドロタルサイト型被処理粒子の板面径は0.045μm、比表面積は60m2/gであった(固形分量65.3g/l)。また、Alに対するMgのモル量は2.4倍であった。
実施例1の1次反応の反応時間を3.5時間として、それ以降は同様に2次反応を行い、白色沈殿物を含むスラリーを生成した。この白色沈殿物を濾過、水洗の後、120℃にて乾燥することにより白色粒子粉末を得た。この白色粒子粉末を同定した結果、ハイドロタルサイト型粒子粉末であることが認められた。得られたハイドロタルサイト型粒子の板面径は0.07μm、比表面積は39m2/gであった(固形分量65.3g/l)。また、Alに対するMgのモル量は2.4倍であった。
CO3 2-イオン濃度が3.17mol/lの炭酸ナトリウム水溶液200mlと9.57mol/lの水酸化ナトリウム水溶液300ml及び水400mlを混合し、全量を900mlとした後、30℃に保持して、反応容器中で撹拌しておく。ここに、Mg2+イオン濃度が2.03mol/lの硫酸マグネシウム水溶液500mlとAl3+イオン濃度が1.06mol/lの硫酸アルミニウム水溶液200mlの混合溶液を添加し、さらに水を100ml加えて、全量を1.7lとした。このスラリーをオートクレーブ反応容器に移し、pH値が10.0、140℃で3時間熟成して、白色沈殿物を含むスラリーを得た。この白色沈殿物を濾過、水洗の後、120℃にて乾燥することにより白色粒子粉末を得た。この白色粒子粉末を同定した結果、ハイドロタルサイト型粒子粉末であることが認められた。得られたハイドロタルサイト型粒子の板面径は0.26μm、厚みは0.05μm、比表面積は17.3m2/gであった(固形分量65.3g/l)。また、Alに対するMgのモル量は2.4倍であった。
実施例1の水熱反応において反応条件をpH値が10.0、160℃、6時間で行い、白色沈殿物を含むスラリーを得た。この白色沈殿物を濾過、水洗の後、120℃にて乾燥することにより白色粒子粉末を得た。この白色粒子粉末を同定した結果、ハイドロタルサイト型粒子粉末であることが認められた。得られたハイドロタルサイト型粒子の板面径は0.24μm、厚みは0.084μm、比表面積は13.2m2/gであった(固形分量65.3g/l)。また、Alに対するMgのモル量は2.4倍であった。
協和化学工業(株)製DHT-4Aを比較例5とした。
堺化学工業(株)製HT-Pを比較例6とした。
Claims (9)
- 吸油量が35ml/100g以下で、吸油量/板面径の値が140~190であることを特徴とするハイドロタルサイト型粒子粉末。
- ハイドロタルサイト型粒子粉末が下記式(1)に表される化合物である請求項1に記載のハイドロタルサイト型粒子粉末。
M2+ 1-x Alx(OH)2 An- p mH2O (1)
(1)式におけるM2+はMgおよびZnよりなる群から選ばれた少なくとも一種の金属元素を示し、An-はn価のアニオンを示し、nは該アニオンの価数を示し、0.2≦x≦0.5、0≦m≦1、p=x/nである。 - 見掛け密度ρaが0.25g/cc以上である請求項1または2に記載のハイドロタルサイト型粒子粉末。
- タップ密度ρtが0.55g/cc以上である請求項1~3のいずれかに記載のハイドロタルサイト型粒子粉末。
- 板面径が0.25μm以下、BET比表面積が30m2/g以下、且つアスペクト比が2.5以下である請求項1~4のいずれかに記載のハイドロタルサイト型粒子粉末。
- 層間水を一部もしくは全部除去した請求項1~5のいずれかに記載のハイドロタルサイト型粒子粉末。
- 請求項1~6のいずれかに記載のハイドロタルサイト型粒子粉末からなる農業フィルム用保温剤。
- 請求項7に記載の農業フィルム用保温剤をオレフィン系樹脂中に含有する農業フィルム用マスターバッチ。
- 請求項7に記載の農業フィルム用保温剤を含有する農業用フィルム。
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US13/392,671 US8946336B2 (en) | 2009-08-26 | 2010-08-26 | Hydrotalcite-type particles, heat retaining agent for agriculture films, master batch for agricultural films, and agricultural film |
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JP2011068877A (ja) | 2011-04-07 |
JP4877539B2 (ja) | 2012-02-15 |
US20120228539A1 (en) | 2012-09-13 |
CN102482109A (zh) | 2012-05-30 |
CN102482109B (zh) | 2015-05-20 |
KR20120058523A (ko) | 2012-06-07 |
EP2471742A1 (en) | 2012-07-04 |
US8946336B2 (en) | 2015-02-03 |
EP2471742A4 (en) | 2014-06-11 |
KR101757488B1 (ko) | 2017-07-12 |
EP2471742B1 (en) | 2018-11-07 |
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