WO2015182305A1 - 耐熱水酸化アルミニウム及びその製造方法 - Google Patents
耐熱水酸化アルミニウム及びその製造方法 Download PDFInfo
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- 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
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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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
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal 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
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/021—After-treatment of oxides or hydroxides
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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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- 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
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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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
- C01P2006/12—Surface area
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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
- C01P2006/32—Thermal properties
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/006—Additives being defined by their surface area
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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
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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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
- C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
- C08L2666/66—Substances characterised by their function in the composition
- C08L2666/84—Flame-proofing or flame-retarding additives
Definitions
- the present invention relates to aluminum hydroxide having heat resistance and a method for producing the same.
- Gibbsite-type aluminum hydroxide is incorporated into various polymer materials used for electronic parts such as printed wiring boards, wire coating materials, insulation materials, etc., using a mechanism in which water contained in crystals is dehydrated by heating. It is used as a flame retardant for imparting flame retardancy.
- gibbsite-type aluminum hydroxide starts dehydration from around 220 to 230 ° C., and this dehydration region corresponds to the processing temperature range depending on the type of resin. In some cases, it was difficult to use.
- Patent Document 1 discloses that Al 2 O 3 .nH 2 O (where n is an average particle size of 0.3 to 4.5 ⁇ m) by preliminarily dehydrating aluminum hydroxide by heat treatment. Is the number of water of hydration), and it is described that it is excellent in heat resistance.
- Patent Document 2 discloses a method of improving the heat resistance by producing ⁇ -alumina by subjecting aluminum hydroxide particles to heat treatment at 230 to 270 ° C. in an air atmosphere. Furthermore, the Example of Patent Document 2 describes that aluminum hydroxide was heat-treated in an air atmosphere at 260 ° C. for a residence time of 30 minutes using a disk dryer.
- Patent Document 3 gibbsite-type aluminum hydroxide produced by the Bayer method is subjected to a heat treatment under a pressure of atmospheric pressure to 0.3 MPa and a water vapor mole fraction of 0.03 to 1. Thus, it is described that a thermal history can be imparted while suppressing generation of defects on the outermost surface, and the heat resistance of aluminum hydroxide is improved.
- Patent Document 4 aluminum hydroxide and a reaction retarding agent that delays boehmite formation are mixed, and by heating and pressurizing in a hydrothermal treatment or steam atmosphere in a pressure vessel, it is completely converted into boehmite. It is described that a heat history can be imparted while suppressing the boehmite formation only to a part, and the heat resistance of aluminum hydroxide is improved in an environment where phase transition occurs.
- Patent Document 5 discloses a method in which aluminum hydroxide particles are subjected to a heat treatment at 200 ° C. to 270 ° C. in a gas atmosphere containing fluorine, or the aluminum hydroxide particles are treated with a solution containing fluorine ions to obtain particles.
- a method is described in which a part of the hydroxyl groups of this is replaced with fluorine, followed by heat treatment at 200 ° C. to 270 ° C. According to these methods, aluminum hydroxide having high heat resistance that cannot be achieved only by heat treatment can be obtained.
- Patent Document 4 it is necessary to heat-treat aluminum hydroxide and the additive in an expensive pressure vessel. Further, the method of Patent Document 5 requires heat treatment with harmful fluorine gas, or heat treatment after treating the surface of aluminum hydroxide with harmful hydrofluoric acid. there were. For this reason, it has been difficult to produce heat-resistant aluminum hydroxide with safe and high productivity by the conventional method.
- aluminum hydroxide produced by the methods described in Patent Documents 4 and 5 has a very high dehydration temperature, and thus is suitable for engineering plastics having a very high melting point, but has a relatively low melting point such as polyethylene and polypropylene. Low general purpose resins have excessive heat resistance.
- aluminum hydroxide produced by the methods described in Patent Documents 1 to 3 may cause a dehydration reaction at the processing temperature at which a general-purpose resin is processed, and the heat resistance is not sufficient.
- an object of the present invention is to produce aluminum hydroxide having sufficient heat resistance for use in general-purpose resins, and heat-resistant aluminum hydroxide with safety and high productivity.
- the present inventor has arrived at the present invention as a result of detailed studies on heat-resistant aluminum hydroxide and a method for producing the same.
- [12] including mixing 100 parts by mass of an aluminum hydroxide powder having a boehmite precursor content of 10% by mass or less with 0.01 to 5 parts by mass of a fluorine atom-containing complex, [10] A method for producing the heat-resistant aluminum hydroxide according to any one of [10]. [13] The method according to [12], comprising producing an aluminum hydroxide powder by a buyer method.
- aluminum hydroxide having sufficient heat resistance for use in a general-purpose resin can be provided. Further, according to the present invention, heat-resistant aluminum hydroxide that can withstand the processing temperature of general-purpose resins can be produced safely and with high productivity without the need for heat treatment with an additive containing harmful fluorine.
- the heat-resistant aluminum hydroxide of the present invention contains an aluminum hydroxide powder and a fluorine atom-containing complex.
- the content of the boehmite precursor of the aluminum hydroxide powder is 10% by mass or less, preferably 7% by mass or less, more preferably 5% by mass or less, and further preferably 3% by mass or less. If the content of the boehmite precursor in the aluminum hydroxide powder is not more than the above upper limit value, boehmite hardly occurs when kneading the heat-melted resin and the heat-resistant aluminum hydroxide. Can exhibit heat resistance.
- the lower limit of the content of the boehmite precursor of the aluminum hydroxide powder is usually 0% by mass or more, for example, 0.1% by mass or more.
- the heat-resistant aluminum hydroxide of the present invention is 0.01 parts by mass or more, preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, and 5 parts by mass with respect to 100 parts by mass of the aluminum hydroxide powder.
- the fluorine atom-containing complex is preferably contained in an amount of 3 parts by mass or less, more preferably 1 part by mass or less.
- the content of the fluorine atom-containing complex in the heat-resistant aluminum hydroxide of the present invention is not more than the above upper limit value, the content ratio of the aluminum hydroxide powder in the heat-resistant aluminum hydroxide does not decrease too much, and the heat-resistant aluminum hydroxide further High heat resistance can be exhibited.
- the time until the mass is reduced by 1% by mass at 230 ° C. is preferably 5 minutes or more, more preferably 7 minutes or more, further preferably 10 minutes or more, preferably 60 minutes or less, More preferably, it is 30 minutes or less, More preferably, it is 20 minutes or less.
- Aluminum hydroxide powder can impart flame retardancy to the resin by blending with the resin.
- when blended with a resin it is necessary to knead with the resin melted by heating.
- the temperature of heat melting varies depending on the resin composition and blending composition, it is generally 230 ° C.
- melt kneading time also varies depending on the resin composition and blending composition, but in order to ensure the uniformity of the resin and aluminum hydroxide powder in the resin composition, it is preferable to knead for at least the above 5 minutes. . Therefore, when the time until the heat-resistant aluminum hydroxide of the present invention is reduced by 1% by mass at 230 ° C. is not less than the above lower limit value, the heat-resistant aluminum hydroxide is not easily decomposed during kneading with the resin.
- the moisture release rate does not decrease in the resin composition containing the resin and the heat-resistant aluminum hydroxide.
- the resin composition can exhibit excellent flame retardancy.
- the average particle diameter of the aluminum hydroxide powder contained in the heat-resistant aluminum hydroxide is preferably 0.5 ⁇ m or more, more preferably 1.0 ⁇ m or more, still more preferably 2.0 ⁇ m or more, preferably 15. It is 0 ⁇ m or less, more preferably 10.0 ⁇ m or less, and even more preferably 7.0 ⁇ m or less.
- the resin composition containing the resin and the heat-resistant aluminum hydroxide is particularly excellent in flame retardancy, and when used for a wire coating material, a printed wiring board, etc. In addition, the smoothness of the surface is difficult to decrease.
- the average particle diameter of the aluminum hydroxide powder is not less than the above lower limit, uniformity between the aluminum hydroxide powder and the fluorine atom-containing complex can be secured, and the heat resistance of the heat-resistant aluminum hydroxide is further improved. be able to.
- the total sodium content of the aluminum hydroxide powder is preferably 0.1% by mass or less, more preferably 0.05% by mass or less, in terms of Na 2 O.
- the heat resistance of the resulting heat-resistant aluminum hydroxide can be further increased.
- the lower limit of the total sodium content of the aluminum hydroxide powder in the present invention is usually 0.01% by mass or more, for example 0.03% by mass or more.
- the total sodium content can be measured by a spectroscopic analysis method as described in, for example, JIS-R9301-3-9.
- BET specific surface area of the aluminum hydroxide powder contained in the heat the aluminum hydroxide is preferably 0.5 m 2 / g or more, more preferably 0.7 m 2 / g or more, more preferably 1.0 m 2 / g or more, preferably 8.0 m 2 / g or less, more preferably 5.0 m 2 / g or less, and still more preferably 3.0 m 2 / g or less.
- the BET specific surface area of the aluminum hydroxide powder is not more than the above upper limit, the amount of adsorbed water on the surface of the aluminum hydroxide powder can be suppressed, and foaming due to dehydration can be suppressed during processing and use.
- the flame retardance of the resin composition containing resin and heat resistant aluminum hydroxide further improves that the BET specific surface area of aluminum hydroxide powder is more than the said lower limit.
- the aluminum hydroxide powder contained in the heat-resistant aluminum hydroxide of the present invention contains a coupling agent such as a silane coupling agent and a titanate coupling agent for improving the affinity with the resin and improving the filling property; oleic acid,
- a coupling agent such as a silane coupling agent and a titanate coupling agent for improving the affinity with the resin and improving the filling property
- oleic acid oleic acid
- Surface treatment may be carried out with an aliphatic carboxylic acid such as stearic acid; an aromatic carboxylic acid such as benzoic acid and esters thereof; an additive such as silicate and silicone.
- the surface treatment can be performed by either a dry process or a wet process.
- a dry surface treatment method for example, a method of mixing aluminum hydroxide powder and additive in a Henschel mixer or a Redige mixer, and a mixture of aluminum hydroxide powder and additive to coat the additive uniformly. And the like.
- Examples of the wet surface treatment method include a method in which an additive is dispersed or dissolved in a solvent, aluminum hydroxide powder is dispersed in the obtained solution, and the obtained dispersion is dried.
- the fluorine atom-containing complex in the present invention is preferably solid at 25 ° C. and 100 kPa. If the fluorine atom-containing complex is a gas or a liquid at 25 ° C. and 100 kPa, it becomes difficult to immobilize the fluorine atom-containing complex with respect to the aluminum hydroxide powder, resulting in generation of fluorine gas and elution of hydrofluoric acid in the production process. , Safety can be compromised.
- the fluorine atom-containing complex in the present invention is represented by, for example, a chemical formula MF n (wherein n represents an integer of 1 or more) by a central element (M) and a ligand fluorine (F).
- the central element M include boron (B), aluminum (Al), silicon (Si), phosphorus (P), titanium (Ti), and zirconium (Zr).
- the central element M is preferably boron (B), aluminum (Al), or phosphorus (P), and preferably aluminum (Al) or phosphorus (P) from the viewpoint of safety during production or use. More preferred.
- fluorine atom-containing complex represented by MF n examples include boron fluoride (BF 3 ), aluminum fluoride (AlF 3 ), and phosphorus fluoride (PF 3 ).
- the fluorine atom-containing complex in the present invention is composed of H p MF q (wherein p and q are each independently 1 due to the central element (M), the ligand fluorine (F), and hydrogen (H).
- the elements contained in the neutralized salt include alkali metals and alkaline earth metals, and specific examples include lithium, sodium, potassium, magnesium, and calcium.
- the acid and neutralized salts thereof include fluorinated boric acid (HBF 4 ), lithium fluorinated borate (LiBF 4 ), sodium fluorinated borate (NaBF 4 ), and fluorinated aluminate (H 3 AlF 6 ).
- Lithium fluoroaluminate Li 3 AlF 6
- sodium fluoroaluminate Na 3 AlF 6
- fluorophosphoric acid H 3 PF 6
- lithium fluorophosphate Li 3 PF 6
- fluorine Sodium phosphate Na 3 PF 6
- the fluorine atom-containing complex is more preferably aluminum fluoride or sodium fluorophosphate having low toxicity from the viewpoint of safety during production or use.
- Aluminum fluoride is a solid at 25 ° C. and 100 kPa. When aluminum fluoride is used, it is preferably used after being pulverized. By pulverizing, the activity of aluminum fluoride can be increased, and the heat resistance of aluminum hydroxide can be further improved.
- the pulverization method is not particularly limited, and it can be performed by either a dry or wet processing method.
- a hydrate may be used as aluminum fluoride, but an anhydride represented by AlF 3 is preferably used.
- content of the fluorine atom containing complex in heat-resistant aluminum hydroxide is calculated in terms of an anhydride.
- the average particle diameter of aluminum fluoride is preferably 0.01 ⁇ m or more, more preferably 0.05 ⁇ m or more, further preferably 0.1 ⁇ m or more, particularly preferably 0.2 ⁇ m or more, preferably 5 ⁇ m or less, more preferably It is 1 ⁇ m or less, more preferably 0.8 ⁇ m or less, and particularly preferably 0.5 ⁇ m or less.
- the average particle diameter of aluminum fluoride is not less than the above lower limit value, aggregation of aluminum fluoride hardly occurs and mixing with aluminum hydroxide powder is easy.
- the average particle diameter of aluminum fluoride is not more than the above upper limit value, the aluminum fluoride can sufficiently come into contact with the aluminum hydroxide powder, and the heat resistance can be further improved.
- the BET specific surface area of aluminum fluoride is preferably 10 m 2 / g or more, more preferably 20 m 2 / g or more, still more preferably 30 m 2 / g or more, still more preferably 35 m 2 / g or more, preferably 300 m. 2 / less than, More preferably, it is 200 m ⁇ 2 > / g or less, More preferably, it is 100 m ⁇ 2 > / g or less, More preferably, it is 70 m ⁇ 2 > / g or less.
- the BET specific surface area of aluminum fluoride is not less than the above lower limit, the aluminum fluoride can sufficiently come into contact with the aluminum hydroxide powder, and the heat resistance can be further improved. Further, when the BET specific surface area of aluminum fluoride is not more than the above upper limit, the amount of adsorbed water on the aluminum fluoride surface can be suppressed, and foaming due to dehydration can be suppressed during processing and use.
- Sodium fluorophosphate is solid at 25 ° C. and 100 kPa. When sodium fluorophosphate is used, it may be pulverized. By pulverizing, the dispersibility of sodium fluorophosphate can be improved, and the heat resistance of aluminum hydroxide can be further improved.
- the pulverization method is not particularly limited and can be performed by either dry or wet treatment methods. However, since sodium fluorophosphate has high solubility in water and alcohols such as methanol and ethanol, dry pulverization is possible. Is preferred.
- sodium fluorophosphate When sodium fluorophosphate is used in wet processing such as wet pulverization and wet mixing, it is highly soluble in water and alcohols such as methanol and ethanol, so a part or all of sodium fluorophosphate is fully fluorinated. It exists in the state ionized into the phosphate ion and sodium ion. In that case, it can be recrystallized as sodium fluorophosphate by removing the solvent by drying.
- the average particle diameter of sodium fluorophosphate is preferably 0.01 ⁇ m or more, more preferably 0.05 ⁇ m or more, preferably 500 ⁇ m or less, more preferably 100 ⁇ m or less.
- the average particle diameter of sodium fluorophosphate is not less than the above lower limit, aggregation of sodium fluorophosphate is difficult to occur, and mixing with aluminum hydroxide powder is easy. Further, when the average particle size of sodium fluorophosphate is not more than the above upper limit value, sodium fluorophosphate can sufficiently come into contact with the aluminum hydroxide powder, and the heat resistance can be further improved.
- the BET specific surface area of sodium fluorophosphate is preferably 0.01 m 2 / g or more, more preferably 1 m 2 / g or more, still more preferably 10 m 2 / g or more, and even more preferably 35 m 2 / g or more. , preferably 300 meters 2 / less, more preferably 200 meters 2 / g or less, more preferably 100 m 2 / g or less, still more preferably not more than 70m 2 / g.
- sodium fluorophosphate can sufficiently come into contact with the aluminum hydroxide powder, and the heat resistance can be further improved.
- the BET specific surface area of sodium fluorophosphate is not more than the above upper limit value, the amount of adsorbed water on the surface of sodium fluorophosphate can be suppressed, and foaming due to dehydration can be suppressed during processing and use.
- the average particle diameter of the heat-resistant aluminum hydroxide of the present invention is preferably 0.5 ⁇ m or more, more preferably 1.0 ⁇ m or more, further preferably 2.0 ⁇ m or more, preferably 15 ⁇ m or less, more preferably 10.0 ⁇ m or less. More preferably, it is 7.0 ⁇ m or less.
- the resin and the resin composition containing the heat-resistant aluminum hydroxide are particularly excellent in flame retardancy, and when used for a wire coating material or a printed wiring board In addition, the smoothness of the surface is difficult to decrease.
- the average particle size of the heat-resistant aluminum hydroxide is not less than the above lower limit value, the viscosity of the resin composition containing the resin and the heat-resistant aluminum hydroxide does not become too high, and the resin and the heat-resistant aluminum hydroxide in the resin composition The uniformity can be ensured, and the resin composition can be appropriately produced.
- the average particle size refers to a particle size of 50% on a volume basis in the particle size distribution measured by the laser scattering method.
- the BET specific surface area of the heat-resistant aluminum hydroxide of the present invention is preferably 0.5 m 2 / g or more, more preferably 0.7 m 2 / g or more, further preferably 1.0 m 2 / g or more, preferably 8 .0m 2 / g or less, more preferably 3.0 m 2 / g, more preferably not more than 1.8 m 2 / g.
- the BET specific surface area of the heat-resistant aluminum hydroxide is not more than the above upper limit, the amount of adsorbed water on the surface of the heat-resistant aluminum hydroxide is suppressed, and foaming due to dehydration can be suppressed during processing and use.
- the flame retardance of the resin composition containing resin and heat resistant aluminum hydroxide further improves that the BET specific surface area of heat resistant aluminum hydroxide is more than the said lower limit.
- the boehmite content of the heat-resistant aluminum hydroxide of the present invention is preferably 15% by mass or less, more preferably 11% by mass or less, still more preferably 5% by mass or less, still more preferably 1% by mass or less, and particularly preferably 0.8%. 7% by weight or less, very preferably 0.5% by weight or less.
- the heat-resistant aluminum hydroxide boehmite content is not more than the above upper limit, the transparency unique to aluminum hydroxide is not impaired when blended in the resin, and the resin composition exhibits excellent flame retardancy. be able to.
- the lower limit of the boehmite content of the heat-resistant aluminum hydroxide is usually 0% by mass or more, for example, 0.01% by mass or more.
- the heat-resistant aluminum hydroxide of the present invention can be produced by a method including a step of mixing aluminum hydroxide powder and a fluorine atom-containing complex (also referred to as the production method of the present invention).
- 100 parts by weight of aluminum hydroxide powder 0.01 parts by weight or more, preferably 0.05 parts by weight or more, more preferably 0.1 parts by weight or more, and 5 parts by weight or less, preferably Is mixed with a fluorine atom-containing complex of 3 parts by mass or less, more preferably 1 part by mass or less.
- the fluorine atom-containing complex and the aluminum hydroxide powder can be sufficiently brought into contact with each other in the resulting heat-resistant aluminum hydroxide, thereby further improving the heat resistance. be able to.
- the mixing amount of the fluorine atom-containing complex is not more than the above upper limit value, the content ratio of the aluminum hydroxide powder in the resulting heat-resistant aluminum hydroxide does not decrease excessively, and the heat-resistant aluminum hydroxide exhibits higher heat resistance. be able to.
- the aluminum hydroxide powder has a boehmite precursor content of 10% by mass or less, preferably 7% by mass or less, more preferably 5% by mass or less, and further preferably 3% by mass or less. If the content of the boehmite precursor of the aluminum hydroxide powder is not more than the above upper limit, it is difficult for boehmite to occur when kneading the heat-melted resin and the resulting heat-resistant aluminum hydroxide. Excellent heat resistance can be demonstrated. In addition, the lower limit of the content of the boehmite precursor of the aluminum hydroxide powder is usually 0.1% by mass or more, for example, 0.3% by mass or more.
- the production method of the aluminum hydroxide powder is not particularly limited, but the production method of the present invention preferably includes producing the aluminum hydroxide powder by the Bayer method from the viewpoint of production cost.
- the Bayer method is a method of producing a supersaturated sodium aluminate aqueous solution, adding seeds to this aqueous solution to precipitate the aluminum component contained in the aqueous solution, washing the resulting slurry containing aluminum hydroxide, By drying, an aluminum hydroxide powder can be obtained.
- the content of the boehmite precursor in the aluminum hydroxide powder corresponds to the amount of intraparticle defects contained in the gibbsite type aluminum hydroxide powder produced by the Bayer method.
- the intragranular defects contained in the gibbsite-type aluminum hydroxide powder disappear by gradually generating boehmite by receiving heat of about 220 ° C. in an air atmosphere. For this reason, it is possible to reduce defects in the particles by performing a heat treatment in advance, but it is preferable to use an aluminum hydroxide powder with few defects in the particles without performing the heat treatment.
- the lower the content of the boehmite precursor in the aluminum hydroxide powder the better.
- advanced techniques are required, the production cost of the aluminum hydroxide powder increases. When the amount is too large, the effect of improving heat resistance by the fluorine atom-containing complex to be mixed becomes small.
- the aluminum hydroxide powder produced by the Bayer method is a gibbsite type aluminum hydroxide powder, and the crystal structure is represented by the formula of Al (OH) 3 or Al 2 O 3 .3H 2 O.
- the aluminum hydroxide powder in the present invention may be a mixture in which boehmite is partially generated by performing heat treatment in advance.
- the aluminum hydroxide powder can be mixed with the fluorine atom-containing complex not only in the form of powder but also in a cake or water slurry containing water.
- the pressure is usually from atmospheric pressure to 0.3 MPa, preferably 0.2 MPa or less, 180 ° C to 300 ° C, preferably 200 ° C.
- the heat treatment is performed at a temperature of 280 ° C. or lower, more preferably 220 ° C. or higher and 260 ° C. or lower.
- the mixing method of the aluminum hydroxide powder and the fluorine atom-containing complex is not particularly limited, and it can be performed by either a dry or wet processing method.
- Examples of the dry processing method include a method of mixing in a Henschel mixer or a Redige mixer, and a method of adding a mixture of aluminum hydroxide powder and a fluorine atom-containing complex to a pulverizer to pulverize the mixture uniformly.
- Examples of the wet processing method include a method of dispersing or dissolving a fluorine atom-containing complex in a liquid, spraying the obtained solution onto aluminum hydroxide powder, and drying the obtained wet cake.
- the liquid serving as the dispersion medium is not particularly limited, but water that can be easily removed by drying is preferable.
- the aluminum hydroxide powder can be uniformly treated using the fluorine atom-containing complex regardless of the average particle and BET specific surface area of the fluorine atom-containing complex. .
- the heat-resistant aluminum hydroxide of the present invention has a coupling agent such as a silane coupling agent or a titanate coupling agent; an aliphatic carboxylic acid such as oleic acid or stearic acid, in order to improve the affinity with the resin and the filling property.
- a coupling agent such as a silane coupling agent or a titanate coupling agent
- an aliphatic carboxylic acid such as oleic acid or stearic acid
- Surface treatment may be performed with an acid; an aromatic carboxylic acid such as benzoic acid and an ester thereof; and an additive such as silicate and silicone.
- the surface treatment can be performed by either a dry process or a wet process.
- a dry surface treatment method for example, a method of mixing an aluminum hydroxide powder and an additive in a Henschel mixer or a Redige mixer, and a mixture of a heat-resistant aluminum hydroxide and an additive to coat the additive uniformly. And the like.
- Examples of the wet surface treatment method include a method in which an additive is dispersed or dissolved in a solvent, heat-resistant aluminum hydroxide is dispersed in the obtained solution, and the obtained dispersion is dried.
- the heat-resistant aluminum hydroxide of the present invention has high heat resistance and a small amount of adsorbed water, is suitable as a filler for resin, and can be used as a filler for resin.
- the resin is not particularly limited, and examples thereof include rubber, thermoplastic resins such as polypropylene and polyethylene, and thermosetting resins such as epoxy resins. Since the heat-resistant aluminum hydroxide of the present invention has excellent heat resistance at 230 ° C., the resin is preferably a general-purpose thermoplastic resin having a heat melting temperature of about 230 ° C. or less.
- thermoplastic resins examples include polyolefins such as polypropylene and polyethylene, polyamides, polystyrene, polyvinyl chloride, ABS (acrylonitrile butadiene styrene) resins, and the like.
- the heat-resistant aluminum hydroxide of the present invention can be suitably used as a filler for general-purpose resins having a heat melting temperature of about 230 ° C. or less.
- the resin composition containing the heat-resistant aluminum hydroxide and the resin of the present invention can be obtained by mixing the heat-resistant aluminum hydroxide and the resin using a commonly used known method.
- the resin composition containing the heat-resistant aluminum hydroxide and the resin of the present invention is, for example, a member such as a printed wiring board or an electronic component of an electronic device such as a prepreg constituting the printed wiring board, a wire covering material, a polyolefin molding material, a tire.
- a member such as a printed wiring board or an electronic component of an electronic device such as a prepreg constituting the printed wiring board, a wire covering material, a polyolefin molding material, a tire.
- building materials such as artificial marble can be mentioned, and particularly preferable applications are parts of electronic devices such as printed wiring boards and sealing materials that require high heat resistance during processing and use, and wire coating materials.
- Average particle size As a measuring device, a laser scattering type particle size distribution measuring device [“MICROTRACK MT-3300EXII” manufactured by Nikkiso Co., Ltd.] was used. A sample was added to a 0.2 mass% sodium hexametaphosphate aqueous solution, adjusted to a measurable concentration, then irradiated with an ultrasonic wave with an output of 25 W for 120 seconds and then measured with 2 samples. From the average value, the particle diameter and particle diameter were measured. A distribution curve was determined. The average particle size was determined as a 50% by mass equivalent particle size (D50 ( ⁇ m)). Moreover, when the average particle diameter calculated
- BET specific surface area of the sample was measured by a nitrogen adsorption method using a fully automatic specific surface area measuring device (“Macsorb HM-1201” manufactured by Mountaintech) according to the method specified in JIS-Z-8830. Asked.
- Total sodium content The total sodium content contained in the sample was determined according to the ICP emission spectroscopic method defined in JIS-R9301-3-9.
- Boehmite precursor content 10 g of a sample is placed in a hot air dryer with an internal volume of 216 L and an atmospheric temperature of 220 ° C., and heat treatment is performed under atmospheric pressure and atmospheric pressure for 4 hours to completely convert the boehmite precursor to boehmite. Crystal transition occurred.
- the boehmite precursor content was measured under the following measurement conditions using a powder X-ray diffractometer (“RINT-2000” manufactured by Rigaku Corporation) using Cu as the X-ray source. Step width: 0.02 deg Scan speed: 0.04 deg / sec Acceleration voltage: 40 kV Acceleration current: 30 mA
- the result of measurement under the above measurement conditions is compared with JCPDS card 70-2038 (equivalent to gibbsite type aluminum hydroxide) to calculate the peak area S (002) corresponding to the (002) plane of gibbsite type aluminum hydroxide.
- the measurement results were compared with JCPDS card 83-1505 (corresponding to boehmite) to obtain the peak area S (020) corresponding to the (020) plane of boehmite.
- the boehmite content was calculated using these two peak areas and the following equation.
- Boehmite content (% by mass) ⁇ S (020) / [S (020) + S (002)] ⁇ ⁇ 100
- Boehmite precursor content (mass%) ⁇ (boehmite content ⁇ 78/60) / [boehmite content ⁇ 78/60) + (100 ⁇ boehmite content)] ⁇ ⁇ 100
- Boehmite content The Cu was used as the X-ray source, and the boehmite content of the sample was measured under the following measurement conditions in a powder X-ray diffractometer ("RINT-2000" manufactured by Rigaku Corporation). Step width: 0.02 deg Scan speed: 0.04 deg / sec Acceleration voltage: 40 kV Acceleration current: 30 mA
- Example 1 In accordance with the method described in WO2014 / 133049 [Example 1] using the aluminum hydroxide powder [“CL-303” manufactured by Sumitomo Chemical Co., Ltd.] used as a raw material in Comparative Example 4 described later, the hydroxylation shown in Table 1 Aluminum powder was produced. 100 mass parts of aluminum hydroxide powder shown in Table 1 and a 10 mass% water slurry of fine powder having a BET specific surface area of 36 m 2 / g and an average particle size of 0.3 ⁇ m obtained by grinding aluminum fluoride (Morita Chemical Co., Ltd.) powder 5 parts by mass was wet-mixed in a plastic bag and dried at 120 ° C. to obtain heat-resistant aluminum hydroxide (1). The physical properties of this heat-resistant aluminum hydroxide (1) were measured according to the above measurement method. The results are shown in Table 1.
- Example 2 100 parts by mass of the aluminum hydroxide powder shown in Table 1 prepared in Example 1, 0.3 parts by mass of sodium fluorophosphate [manufactured by Wako Pure Chemical Industries, Ltd.] powder, and 1.5 parts by mass of pure water Wet and mixed in a plastic bag and dried at 120 ° C. to obtain heat-resistant aluminum hydroxide (2).
- the physical properties of this heat-resistant aluminum hydroxide (2) were measured according to the above measuring method. The results are shown in Table 1.
- Example 3 100 parts by mass of the aluminum hydroxide powder shown in Table 1 prepared in Example 1, 0.3 parts by mass of sodium fluorophosphate (manufactured by Wako Pure Chemical Industries, Ltd.) powder, and methyl silicate ("Mitsubishi Chemical” MS -51 ", silicon content 51% by mass in terms of SiO 2 , mass average molecular weight 500 to 700] 0.6 parts by mass and 0.9 parts by mass of ethanol were wet-mixed in a plastic bag at 120 ° C. It dried and obtained heat-resistant aluminum hydroxide (3). The physical properties of this heat-resistant aluminum hydroxide (3) were measured according to the above measuring method. The results are shown in Table 1.
- Example 4 A heat-resistant aluminum hydroxide (4) was obtained in the same manner as in Example 1 except that the aluminum hydroxide powder shown in Table 1 [“CL-310” manufactured by Sumitomo Chemical Co., Ltd.] was used. The physical properties of this heat-resistant aluminum hydroxide (4) were measured according to the above measuring method. The results are shown in Table 1.
- Example 5 A heat-resistant aluminum hydroxide (5) was obtained in the same manner as in Example 2 except that the aluminum hydroxide powder shown in Table 1 [“CL-310” manufactured by Sumitomo Chemical Co., Ltd.] was used. The physical properties of this heat-resistant aluminum hydroxide (5) were measured according to the above measuring method. The results are shown in Table 1.
- Example 6 A heat-resistant aluminum hydroxide (6) was obtained in the same manner as in Example 2 except that the aluminum hydroxide powder shown in Table 1 [“C-301N” manufactured by Sumitomo Chemical Co., Ltd.] was used. The physical properties of this heat-resistant aluminum hydroxide (6) were measured according to the above measuring method. The results are shown in Table 1.
- Comparative Example 1 The aluminum hydroxide powder shown in Table 1 produced in Example 1 was used as aluminum hydroxide (1), and the physical properties of this aluminum hydroxide (1) were measured according to the above measuring method. The results are shown in Table 1.
- Comparative Example 2 The aluminum hydroxide powder (“CL-310” manufactured by Sumitomo Chemical Co., Ltd.) used as a raw material in Example 4 was aluminum hydroxide (2), and the physical properties of this aluminum hydroxide (2) were measured according to the measurement methods described above. went. The results are shown in Table 1.
- Comparative Example 3 The aluminum hydroxide powder (“C-301N” manufactured by Sumitomo Chemical Co., Ltd.) used as a raw material in Example 6 was aluminum hydroxide (3), and the physical properties of this aluminum hydroxide (3) were measured according to the above measurement methods. went. The results are shown in Table 1.
- Comparative Example 4 Aluminum hydroxide (4) was obtained in the same manner as in Example 2 except that the aluminum hydroxide powder shown in Table 1 [“CL-303” manufactured by Sumitomo Chemical Co., Ltd.] was used. Each physical property of this aluminum hydroxide (4) was measured according to the above measuring method. The results are shown in Table 1.
- Comparative Example 5 The aluminum hydroxide powder (“CL-303” manufactured by Sumitomo Chemical Co., Ltd.) used as a raw material in Comparative Example 4 was aluminum hydroxide (5), and the physical properties of this aluminum hydroxide (5) were measured according to the above measurement methods. went. The results are shown in Table 1.
- Example 6 Aluminum hydroxide (6) was obtained in the same manner as in Example 2 except that the aluminum hydroxide powder shown in Table 1 [“C-303” manufactured by Sumitomo Chemical Co., Ltd.] was used. Each physical property of this aluminum hydroxide (6) was measured according to the above measuring method. The results are shown in Table 1.
- Comparative Example 7 The aluminum hydroxide powder (“C-303” manufactured by Sumitomo Chemical Co., Ltd.) used as a raw material in Comparative Example 6 was aluminum hydroxide (7), and the physical properties of this aluminum hydroxide (7) were measured by the above measuring method. Went according to. The results are shown in Table 1.
- the heat-resistant aluminum hydroxides (1) to (6) obtained in Examples 1 to 6 had a long time to decrease by 1% by mass at 230 ° C. and resulted in high heat resistance.
- the aluminum hydroxides (1) to (7) in Comparative Examples 1 to 7 have a short time to decrease by 1% by mass at 230 ° C., indicating that the heat resistance is low.
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Abstract
Description
(1)Al2O3・3H2O ⇒ Al2O3・H2O + 2H2O
(2)Al2O3・3H2O ⇒ Al2O3 + 3H2O
(1)は、ギブサイト型の水酸化アルミニウムからアルミナ一水和物であるベーマイトへの脱水、(2)はアルミナへの脱水である。一般的に(1)の脱水は低温側(220℃程度)から起こりやすく、(2)は(1)と同時または高温側(230℃程度)から開始される。このため、ギブサイト型の水酸化アルミニウムの耐熱性を向上させるために、種々の条件下で加熱処理し、予め低温側で起こる(1)の脱水および、(2)の脱水の一部を進行させておくことが行われてきた。
〔1〕ベーマイト前駆体の含有量が10質量%以下の水酸化アルミニウム粉末100質量部と、フッ素原子含有錯体0.01質量部以上5質量部以下とを含む、耐熱水酸化アルミニウム。
〔2〕水酸化アルミニウム粉末の平均粒子径は0.5μm以上15μm以下である、〔1〕に記載の耐熱水酸化アルミニウム。
〔3〕水酸化アルミニウム粉末の全ナトリウム含有量は、Na2O換算で0.01質量%以上0.1質量%以下である、〔1〕または〔2〕に記載の耐熱水酸化アルミニウム。
〔4〕フッ素原子含有錯体は、25℃、100kPaにおいて固体である、〔1〕~〔3〕のいずれかに記載の耐熱水酸化アルミニウム。
〔5〕フッ素原子含有錯体の中心元素は、ホウ素(B)、アルミニウム(Al)またはリン(P)である、〔1〕~〔4〕のいずれかに記載の耐熱水酸化アルミニウム。
〔6〕フッ素原子含有錯体はフッ化アルミニウムまたはフッ化リン酸ナトリウムである、〔1〕~〔5〕のいずれかに記載の耐熱水酸化アルミニウム。
〔7〕230℃において1質量%減少するまでの時間は5分以上60分以下である、耐熱水酸化アルミニウム。
〔8〕平均粒子径が0.5μm以上15μm以下である、〔1〕~〔7〕のいずれかに記載の耐熱水酸化アルミニウム。
〔9〕BET比表面積が0.5m2/g以上1.8m2/g以下である、〔1〕~〔8〕のいずれかに記載の耐熱水酸化アルミニウム。
〔10〕ベーマイト含有量が15質量%以下である、〔1〕~〔9〕のいずれかに記載の耐熱水酸化アルミニウム。
〔11〕樹脂および〔1〕~〔10〕のいずれかに記載の耐熱水酸化アルミニウムを含む樹脂組成物。
〔12〕ベーマイト前駆体の含有量が10質量%以下の水酸化アルミニウム粉末100質量部と、フッ素原子含有錯体0.01質量部以上5質量部以下とを混合することを含む、〔1〕~〔10〕のいずれかに記載の耐熱水酸化アルミニウムを製造する方法。
〔13〕水酸化アルミニウム粉末をバイヤー法によって製造することを含む、〔12〕に記載の方法。
本発明の耐熱水酸化アルミニウムは、水酸化アルミニウム粉末とフッ素原子含有錯体とを含む。本発明において、水酸化アルミニウム粉末のベーマイト前駆体の含有量は、10質量%以下、好ましくは7質量%以下、より好ましくは5質量%以下、さらに好ましくは3質量%以下である。水酸化アルミニウム粉末のベーマイト前駆体の含有量が上記上限値以下であれば、加熱溶融された樹脂と耐熱水酸化アルミニウムとを混練する際にベーマイトが生じ難いため、耐熱水酸化アルミニウムがさらに優れた耐熱性を発揮できる。なお、水酸化アルミニウム粉末のベーマイト前駆体の含有量の下限値は、通常0質量%以上、例えば0.1質量%以上である。
水酸化アルミニウム粉末は、樹脂に配合することで樹脂に難燃性を付与することができる。一方で、樹脂に配合する際は、加熱溶融された樹脂と混練する必要がある。加熱溶融の温度は、樹脂組成や配合組成に応じて異なるが、ポリプロピレンやポリエチレンなどの汎用樹脂であれば概ね230℃以下であることから、配合する材料には230℃において混練した際に分解しないことが好ましい。溶融混練の時間についても、樹脂組成や配合組成に応じて異なるが、樹脂組成物における樹脂および水酸化アルミニウム粉末の均一性を確保するためには、少なくとも上記5分以上の時間混練することが好ましい。そのため、本発明の耐熱水酸化アルミニウムは、230℃において1質量%減少するまでの時間が上記下限値以上であると、樹脂との混練の際に耐熱水酸化アルミニウムが分解し難い。また、本発明の耐熱水酸化アルミニウムは、230℃において1質量%減少するまでの時間が上記上限値以下であると、樹脂および耐熱水酸化アルミニウムを含む樹脂組成物において水分放出速度が低下せず、樹脂組成物は優れた難燃性を発揮することができる。
なお、実施例および比較例における水酸化アルミニウム粉末について、以下に示す測定方法に従って、平均粒子径、BET比表面積、全ナトリウム含有量、ベーマイト前駆体含有量、およびベーマイト含有量を測定した。また、以下に示す方法に従って、実施例および比較例における耐熱水酸化アルミニウムについて、平均粒子径、BET比表面積、ベーマイト含有量、および耐熱性を測定した。
測定装置として、レーザー散乱式粒子径分布測定装置〔日機装社製「マイクロトラックMT-3300EXII」〕を用いた。試料を0.2質量%ヘキサメタリン酸ナトリウム水溶液中に加え、測定可能濃度に調整した後、出力25Wの超音波を120秒間照射した後に試料数2で測定し、その平均値から粒子径および粒子径分布曲線を求めた。平均粒子径は、50質量%相当粒子径(D50(μm))として求めた。また、前記の方法にて求めた平均粒子径が2μm以下を示した場合は測定条件を変更し、出力40Wの超音波を300秒間照射した後に測定した値を採用した。
試料のBET比表面積を、JIS-Z-8830に規定された方法に従い、全自動比表面積測定装置〔Mountech社製「Macsorb HM-1201」〕を用いて、窒素吸着法により求めた。
試料中に含まれる全ナトリウム含有量を、JIS-R9301-3-9に規定されたICP発光分光分析法に従い求めた。
試料を、内容積216L、雰囲気温度220℃の熱風乾燥機内に10g仕込み、大気雰囲気、大気圧下4時間加熱処理を行うことで、ベーマイト前駆体を完全にベーマイトへ結晶転移させた。
次に、X線源としてCuを用い、粉末X線回折測定装置〔リガク社製「RINT-2000」〕において、以下の測定条件でベーマイト前駆体含有量の測定を行った。
ステップ幅:0.02deg
スキャンスピード:0.04deg/sec
加速電圧:40kV
加速電流:30mA
ベーマイト含有量(質量%)={S(020)/〔S(020)+S(002)〕}×100
求めたベーマイト含有量と以下の式を用いて、加熱処理前の試料が含有するベーマイト前駆体含有量を算出した。
ベーマイト前駆体含有量(質量%)={(ベーマイト含有量×78/60)/〔ベーマイト含有量×78/60)+(100-ベーマイト含有量)〕}×100
X線源としてはCuを用いて、粉末X線回折測定装置〔リガク社製「RINT-2000」〕において、以下の測定条件で試料のベーマイト含有量の測定を行った。
ステップ幅:0.02deg
スキャンスピード:0.04deg/sec
加速電圧:40kV
加速電流:30mA
ベーマイト含有量(質量%)={S(020)/〔S(020)+S(002)〕}×100
示差熱重量分析装置〔リガク社製「Thermo Plus TG8120」〕において、約10mgの試料を用いて、測定を行った。露点温度-20℃以下の空気を流量100ml/分で流し、温度を、昇温速度10℃/分で常温から230℃まで昇温し、そのまま保持した。230℃到達時点を基準として、重量が1%減少した時間を測定して耐熱性を評価した。
後述の比較例4において原料として用いた水酸化アルミニウム粉末〔住友化学社製「CL-303」〕を用いて、WO2014/133049〔実施例1〕記載の方法に準じて、表1に示す水酸化アルミニウム粉末を作製した。表1に示す水酸化アルミニウム粉末100質量部と、フッ化アルミニウム〔森田化学工業社製〕粉末を粉砕したBET比表面積36m2/g、平均粒子径0.3μmの微粉末の10質量%水スラリー5質量部とをポリ袋内で湿式振とう混合し、120℃で乾燥し、耐熱水酸化アルミニウム(1)を得た。この耐熱水酸化アルミニウム(1)の各物性の測定を、上記測定方法に従って行った。その結果を表1に示す。
実施例1で作製した表1に示す水酸化アルミニウム粉末100質量部と、フッ化リン酸ナトリウム〔和光純薬工業株式会社製〕粉末0.3質量部と、純水1.5質量部とをポリ袋内で湿式振とう混合し、120℃で乾燥し、耐熱水酸化アルミニウム(2)を得た。この耐熱水酸化アルミニウム(2)の各物性の測定を、上記測定方法に従って行った。その結果を表1に示す。
実施例1で作製した表1に示す水酸化アルミニウム粉末100質量部と、フッ化リン酸ナトリウム〔和光純薬工業株式会社製〕粉末0.3質量部と、メチルシリケート〔三菱化学社製「MS-51」、SiO2換算のケイ素含有量51質量%、質量平均分子量500~700〕0.6質量部と、エタノール0.9質量部とをポリ袋内で湿式振とう混合し、120℃で乾燥し、耐熱水酸化アルミニウム(3)を得た。この耐熱水酸化アルミニウム(3)の各物性の測定を、上記測定方法に従って行った。その結果を表1に示す。
表1に示す水酸化アルミニウム粉末〔住友化学社製「CL-310」〕を用いた以外は、実施例1と同様の方法により、耐熱水酸化アルミニウム(4)を得た。この耐熱水酸化アルミニウム(4)の各物性の測定を、上記測定方法に従って行った。その結果を表1に示す。
表1に示す水酸化アルミニウム粉末〔住友化学社製「CL-310」〕を用いた以外は、実施例2と同様の方法により耐熱水酸化アルミニウム(5)を得た。この耐熱水酸化アルミニウム(5)の各物性の測定を、上記測定方法に従って行った。その結果を表1に示す。
表1に示す水酸化アルミニウム粉末〔住友化学社製「C-301N」〕を用いた以外は、実施例2と同様の方法により耐熱水酸化アルミニウム(6)を得た。この耐熱水酸化アルミニウム(6)の各物性の測定を、上記測定方法に従って行った。その結果を表1に示す。
実施例1で作製した表1に示す水酸化アルミニウム粉末を水酸化アルミニウム(1)とし、この水酸化アルミニウム(1)の各物性の測定を、上記測定方法に従って行った。その結果を表1に示す。
実施例4において原料として用いた水酸化アルミニウム粉末〔住友化学社製「CL-310」〕を水酸化アルミニウム(2)とし、この水酸化アルミニウム(2)の各物性の測定を、上記測定方法に従って行った。その結果を表1に示す。
実施例6において原料として用いた水酸化アルミニウム粉末〔住友化学社製「C-301N」〕を水酸化アルミニウム(3)とし、この水酸化アルミニウム(3)の各物性の測定を、上記測定方法に従って行った。その結果を表1に示す。
表1に示す水酸化アルミニウム粉末〔住友化学社製「CL-303」〕を用いた以外は、実施例2と同様の方法により水酸化アルミニウム(4)を得た。この水酸化アルミニウム(4)の各物性の測定を、上記測定方法に従って行った。その結果を表1に示す。
比較例4において原料として用いた水酸化アルミニウム粉末〔住友化学社製「CL-303」〕を水酸化アルミニウム(5)とし、この水酸化アルミニウム(5)の各物性の測定を、上記測定方法に従って行った。その結果を表1に示す。
表1に示す水酸化アルミニウム粉末〔住友化学社製「C-303」〕を用いた以外は、実施例2と同様の方法により水酸化アルミニウム(6)を得た。この水酸化アルミニウム(6)の各物性の測定を、上記測定方法に従って行った。その結果を表1に示す。
比較例6において原料として用いた、水酸化アルミニウム粉末〔住友化学社製「C-303」〕を水酸化アルミニウム(7)とし、この水酸化アルミニウム(7)の各物性の測定を、上記測定方法に従って行った。その結果を表1に示す。
Claims (13)
- ベーマイト前駆体の含有量が10質量%以下の水酸化アルミニウム粉末100質量部と、フッ素原子含有錯体0.01質量部以上5質量部以下とを含む、耐熱水酸化アルミニウム。
- 水酸化アルミニウム粉末の平均粒子径は0.5μm以上15μm以下である、請求項1に記載の耐熱水酸化アルミニウム。
- 水酸化アルミニウム粉末の全ナトリウム含有量は、Na2O換算で0.01質量%以上0.1質量%以下である、請求項1または2に記載の耐熱水酸化アルミニウム。
- フッ素原子含有錯体は、25℃、100kPaにおいて固体である、請求項1~3のいずれかに記載の耐熱水酸化アルミニウム。
- フッ素原子含有錯体の中心元素は、ホウ素(B)、アルミニウム(Al)またはリン(P)である、請求項1~4のいずれかに記載の耐熱水酸化アルミニウム。
- フッ素原子含有錯体はフッ化アルミニウムまたはフッ化リン酸ナトリウムである、請求項1~5のいずれかに記載の耐熱水酸化アルミニウム。
- 230℃において1質量%減少するまでの時間は5分以上60分以下である、耐熱水酸化アルミニウム。
- 平均粒子径が0.5μm以上15μm以下である、請求項1~7のいずれかに記載の耐熱水酸化アルミニウム。
- BET比表面積が0.5m2/g以上1.8m2/g以下である、請求項1~8のいずれかに記載の耐熱水酸化アルミニウム。
- ベーマイト含有量が15質量%以下である、請求項1~9のいずれかに記載の耐熱水酸化アルミニウム。
- 樹脂および請求項1~10のいずれかに記載の耐熱水酸化アルミニウムを含む樹脂組成物。
- ベーマイト前駆体の含有量が10質量%以下の水酸化アルミニウム粉末100質量部と、フッ素原子含有錯体0.01質量部以上5質量部以下とを混合することを含む、請求項1~10のいずれかに記載の耐熱水酸化アルミニウムを製造する方法。
- 水酸化アルミニウム粉末をバイヤー法によって製造することを含む、請求項12に記載の方法。
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