WO2016031803A1 - 新規水酸化マグネシウム系固溶体、およびそれを含む樹脂組成物および高活性酸化マグネシウムの前駆体 - Google Patents
新規水酸化マグネシウム系固溶体、およびそれを含む樹脂組成物および高活性酸化マグネシウムの前駆体 Download PDFInfo
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- magnesium hydroxide
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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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C53/00—Saturated compounds having only one carboxyl group bound to an acyclic carbon atom or hydrogen
- C07C53/02—Formic acid
- C07C53/06—Salts thereof
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C59/00—Compounds having carboxyl groups bound to acyclic carbon atoms and containing any of the groups OH, O—metal, —CHO, keto, ether, groups, groups, or groups
- C07C59/01—Saturated compounds having only one carboxyl group and containing hydroxy or O-metal groups
- C07C59/06—Glycolic acid
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C59/00—Compounds having carboxyl groups bound to acyclic carbon atoms and containing any of the groups OH, O—metal, —CHO, keto, ether, groups, groups, or groups
- C07C59/01—Saturated compounds having only one carboxyl group and containing hydroxy or O-metal groups
- C07C59/08—Lactic acid
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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
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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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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K21/00—Fireproofing materials
- C09K21/02—Inorganic materials
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K21/00—Fireproofing materials
- C09K21/06—Organic materials
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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
- 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
- C01F5/22—Magnesium hydroxide from magnesium compounds with alkali hydroxides or alkaline- earth oxides or hydroxides
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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
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
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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
- C08K9/00—Use of pretreated ingredients
- C08K9/02—Ingredients treated with inorganic substances
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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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
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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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
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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
- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
Definitions
- the present invention relates to a novel magnesium hydroxide solid solution represented by the following formula (1), a reinforcing flame retardant for a synthetic resin containing the magnesium hydroxide solid solution as an active ingredient, a synthetic resin composition, and a highly active magnesium oxide Relating to the precursor.
- Mg (OH) 2-x R x (Formula 1) (In the formula, R represents a monovalent organic acid, and x represents 0 ⁇ x ⁇ 1.)
- Magnesium hydroxide is a phytoacid (gastric acid neutralizer), laxative, PVC stabilizer, ceramic raw material, heavy oil additive, flue gas desulfurizer, bitter fertilizer, food additive (magnesium fortifier), etc. It is used in various fields such as resin flame retardants (utilization of endothermic properties during thermal decomposition). For example, magnesium hydroxide particles have attracted attention in order to meet the flame retardant requirements for synthetic resins. Magnesium hydroxide particles have an advantage that they can be applied to almost all resins since the dehydration start temperature is about 340 ° C.
- Patent Document 1 since a new method for synthesizing magnesium hydroxide particles with good crystal growth has been developed, it has become possible to obtain a good molded product using this method.
- These magnesium hydroxide particles have good affinity with resins such as polyolefins, no silver streak is generated during molding, and it is possible to obtain a molded product having an excellent appearance, and V-0 in UL standard 94VE. It describes that a flame-retardant polypropylene resin molded product that satisfies the requirements can be obtained.
- Patent Document 2 a flame retardant comprising magnesium hydroxide particles having an average secondary particle diameter of 0.4 to 1.0 ⁇ m measured by a laser diffraction / scattering method is used for polyolefin or a copolymer thereof.
- Patent Document 3 a fixed amount of magnesium hydroxide having an average secondary particle diameter of 0.01 to 10 ⁇ m measured by a laser diffraction scattering method is blended with hydrotalcite compound particles having specific properties.
- technologies for suppressing the foaming caused by carbon dioxide gas have been proposed.
- JP 52-115799 A Japanese Patent No. 4157560 WO2011 / 111487 JP-A-4-10330
- an object of the present invention is to provide a magnesium hydroxide-based compound having nano-level fine particles close to monodispersion and capable of making primary particles smaller than conventional magnesium hydroxide. Furthermore, it aims at providing the magnesium hydroxide type compound which can anticipate the improvement of the flame retardance etc. from which the dehydration start temperature fell from Mg (OH) 2 . Another object of the present invention is to produce a highly transparent liquid product capable of producing nano-level highly dispersed fine particles.
- the present invention newly competes with alkali-derived OH ⁇ in a conventional production method for producing magnesium hydroxide by adding an alkali such as NaOH or Ca (OH) 2 to an aqueous solution of a water-soluble magnesium salt such as MgCl 2.
- an alkali such as NaOH or Ca (OH) 2
- a water-soluble magnesium salt such as MgCl 2.
- R represents a monovalent organic acid
- x represents 0 ⁇ x ⁇ 1, preferably 0 ⁇ x ⁇ 0.2.
- x is larger than 1, it exceeds the solid solubility limit of monovalent organic acid in magnesium hydroxide.
- the gist of the present invention is the magnesium hydroxide solid solution described in the following (1) to (7).
- Mg (OH) 2-x R x (Formula 1) In the formula, R represents a monovalent organic acid, and x represents 0 ⁇ x ⁇ 1.
- R represents a monovalent organic acid
- x 0 ⁇ x ⁇ 1.
- this invention makes a summary the flame retardant for synthetic resins as described in the following (8), the synthetic resin composition as described in (9) and (10), and its molded article.
- a flame retardant for a synthetic resin comprising the magnesium hydroxide solid solution according to any one of (1) to (6) as an active ingredient.
- (9) (a) 0.1 to 50 parts by weight of the magnesium hydroxide solid solution according to any one of (1) to (6) above is blended with 100 parts by weight of the synthetic resin.
- the magnesium hydroxide-based solid solution of the present invention is represented by the following formula, and primary particles and secondary particles can be made smaller than conventional magnesium hydroxide (Mg (OH) 2 ).
- Mg (OH) 2 magnesium hydroxide
- the reactivity with the acid is improved, and the flame retardancy and mechanical strength of the resin are improved.
- the dehydration start temperature is lower than Mg (OH) 2 and flame retardancy and the like are improved.
- it is useful as a precursor of nano-level highly dispersed fine particle MgO.
- Mg (OH) 2-x R x (Formula 1) (Where R is a monovalent organic acid, x is 0 ⁇ x ⁇ 1)
- the production of the magnesium hydroxide solid solution of the present invention is a new production method in which magnesium hydroxide is produced by adding an alkali such as NaOH or Ca (OH) 2 to an aqueous solution of a water-soluble magnesium salt such as MgCl 2.
- an alkali such as NaOH or Ca (OH) 2
- a water-soluble magnesium salt such as MgCl 2.
- the magnesium hydroxide solid solution of the present invention represented by the following formula can greatly suppress the growth of primary particles by substituting a part of OH of Mg (OH) 2 with monocarboxylic acid or monooxycarboxylic acid. .
- the reason is a structure close to close packing in the c-axis direction of the OH group by allowing the monocarboxylic acid having an ionic diameter larger than that of the OH group and having a stronger chemical bond strength with Mg than OH to exist during the reaction. This is because it suppresses and inhibits the crystal growth of Mg (OH) 2 .
- primary particles can be made smaller than conventional magnesium hydroxide, and hydrothermal treatment can be performed to synthesize nano-level fine particles close to monodispersion.
- Mg (OH) 2-x R x (Formula 1) (In the formula, R represents a monovalent organic acid, and x represents 0 ⁇ x ⁇ 1.)
- the solid solution of the present invention can be easily produced in which the primary particles are remarkably smaller than the conventional method and the specific surface area by the BET method is 100 m 2 / or more.
- the solid solution of the present invention can be made into nano-level fine particles having a secondary particle size of 0.3 ⁇ m or less, further 0.1 ⁇ m or less by wet grinding such as bead milling or hydrothermal treatment at about 150 ° C. or less.
- non-sedimentable and highly transparent slurry (liquid) can be produced.
- the dehydration start temperature by decomposition can be lowered by 40 to 50 ° C. from Mg (OH) 2 .
- the magnesium hydroxide solid solution of the present invention has the above characteristics, but other physical properties are similar to those of conventional magnesium hydroxide, and can be used without any problem in the conventional application field.
- the average secondary particle size of the magnesium hydroxide solid solution of the present invention is 300 nm or less, preferably 200 nm or less, and more preferably 100 nm or less.
- the magnesium hydroxide solid solution of the present invention has a mean secondary particle size of 300 nm or less, preferably 200 nm or less, and more preferably 100 nm or less. Therefore, it is a precursor of highly active magnesium oxide (MgO), and MgO is used. Can be used in many ways. Examples of the precursor include magnesium alkoxide (Mg (OR) 2 ), magnesium acetylacetone (Mg (acac) 2 ), magnesium hydroxide (Mg (OH) 2 ), magnesium carbonate (MgCO 2 ), magnesium chloride (MgCl 2 ).
- MgO highly active magnesium oxide
- MgSO 4 Magnesium sulfate
- Mg (NO 3 ) 2 magnesium nitrate
- MgC 2 O 4 magnesium oxalate
- MgO magnesium oxide
- the magnesium oxide (MgO) precursor is obtained by, for example, forming a porous semiconductor layer and then applying a heat treatment by applying a precursor solution of MgO, which is an insulating oxide, from the surface side of the porous semiconductor layer.
- the surface of the conductive semiconductor layer on the catalyst layer side can be covered with MgO to produce a photoelectric conversion element.
- the MgO film forming the protective layer is a printing method (thick film formation method) using an organic material that is a precursor of MgO. Can be done by.
- a printing method as disclosed in Patent Document 4, for example, a liquid organic material is mixed with a glass material, spin-coated on the surface of the panel glass, and fired at around 600 ° C. to crystallize MgO.
- the printing method has an advantage that the process is relatively simple and can be performed at a lower cost than the vacuum vapor deposition method, the EB method, and the sputtering method, and it is not necessary to use a vacuum process.
- the magnesium hydroxide solid solution of the present invention is preferably surface-treated when it is combined with a resin.
- the surface treatment agent include anionic surfactants such as higher fatty acids, phosphate esters, silane coupling agents, titanate coupling agents, aluminum coupling agents, and silicones.
- the surface treating agent is preferably used in an amount of 1 to 20% by weight with respect to magnesium hydroxide.
- the surface treatment is preferably performed by a wet method or a dry method. Wet is a method of dispersing a magnesium hydroxide solid solution in a solvent such as water or alcohol and adding a surface treatment agent with stirring.
- the dry method is a method of adding a surface treating agent to a powdered magnesium hydroxide solid solution under stirring with a high-speed stirrer such as a Henschel mixer.
- Examples of those preferably used as the surface treatment agent are as follows.
- (A) higher fatty acids having 10 or more carbon atoms such as stearic acid, erucic acid, palmitic acid, lauric acid, behenic acid,
- (b) alkali metal salt of the higher fatty acid (c) sulfate ester salt of polyethylene glycol ether, Amide bond sulfate ester salt, ester bond sulfate ester salt, ester bond sulfonate, amide bond sulfonate, ether bond sulfonate, ether bond alkylaryl sulfonate, ester bond alkylaryl sulfonate, amide bond alkylaryl sulfonate Anionic surfactants such as salts, (d) Mono- or diesters such as orthophosphoric acid and oleyl alcohol, stearyl alcohol, or a mixture thereof, and their acid forms or phosphates such as alkali metal salts or
- the surface-treated magnesium hydroxide particles can be made into a final product form by appropriately selecting, for example, means such as washing with water, dehydration, granulation, drying, pulverization, and classification as required.
- Examples of the water-soluble magnesium salt include magnesium chloride, magnesium nitrate, magnesium sulfate, and magnesium acetate.
- Examples of the alkali include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, alkaline earth metal hydroxides such as calcium hydroxide, and ammonium hydroxide.
- Examples of the monovalent organic acid include formic acid, glycolic acid, and lactic acid, and examples of the salt include water-soluble salts such as sodium salt and potassium salt.
- the hydrothermal treatment is performed at 100 ° C. or higher, preferably 105 ° C. to 150 ° C., more preferably 110 ° C. to 130 ° C.
- the treatment time is preferably 1 to 20 hours.
- the magnesium hydroxide solid solution of the present invention can be produced by appropriately selecting and performing conventional steps such as filtration, water washing, emulsification, surface treatment, filtration, drying, pulverization, and classification.
- the resin composition of the present invention is produced by blending magnesium hydroxide solid solution in an amount of 0.1 to 100 parts by weight, preferably 1 to 50 parts by weight with respect to 100 parts by weight of the resin.
- mixing and kneading method of the resin and the magnesium hydroxide solid solution of the present invention any method can be used as long as they can be mixed uniformly.
- they are mixed and kneaded by a single or twin screw extruder, roll, Banbury mixer or the like.
- molding method Per se well-known shaping
- the synthetic resin in which the magnesium hydroxide-based solid solution of the present invention is blended means a resin and / or rubber, and is usually used as a molded product.
- examples thereof include polyethylene, polypropylene, and ethylene / propylene copolymer.
- Polymers copolymers of C 2 to C 8 olefins ( ⁇ -olefins) such as polybutene, poly-4-methylpentene-1, copolymers of these olefins and dienes, ethylene-acrylate copolymers Polymer, polystyrene, ABS resin, AAS resin, AS resin, MBS resin, ethylene / vinyl chloride copolymer resin, ethylene vinyl acetate copolymer resin, ethylene-vinyl chloride-vinyl acetate graft polymer resin, vinylidene chloride, polyvinyl chloride, chlorinated polyethylene, Chlorinated polypropylene, vinyl chloride propylene copolymer, vinyl acetate resin, pheno Shi resin, polyacetal, polyamide, polyimide, polycarbonate, polysulfone, polyphenylene oxide, polyphenylene sulfide, polyethylene terephthalate, polybutylene terephthalate, thermoplastic resins such as meth
- thermoplastic resins include polyolefins or copolymers thereof, specifically, polypropylene resins such as polypropylene homopolymer and ethylene propylene copolymer, high density polyethylene, low density polyethylene, Chain low density polyethylene, ultra low density polyethylene, EVA (ethylene vinyl acetate resin), EEA (ethylene ethyl acrylate resin), EMA (ethylene methyl acrylate copolymer resin), EAA (ethylene acrylic acid copolymer resin), ultra high Polyethylene resins such as molecular weight polyethylene, and polymers or copolymers of C 2 to C 6 olefins ( ⁇ -ethylene) such as polybutene and poly (4-methylpentene-1).
- polypropylene resins such as polypropylene homopolymer and ethylene propylene copolymer
- high density polyethylene low density polyethylene
- Chain low density polyethylene ultra low density polyethylene
- EVA ethylene vinyl acetate resin
- EEA ethylene ethyl acrylate resin
- thermosetting resins such as epoxy resins, phenol resins, melamine resins, unsaturated polyester resins, alkyd resins, urea resins, and EPDM, butyl rubber, isoprene rubber, SBR, NBR, chlorosulfonated polyethylene, NIR, urethane rubber, butadiene
- synthetic rubbers such as rubber, acrylic rubber, silicone rubber, and fluorine rubber.
- the resin composition of the present invention is substantially formed from the synthetic resin and the magnesium hydroxide-based solid solution, and can further contain a small amount of a flame retardant aid. By blending this flame retardant aid, the blending ratio of the magnesium hydroxide solid solution can be further reduced, and the flame retardant effect can be increased.
- the flame retardant aid is preferably red phosphorus, carbon powder or a mixture thereof.
- red phosphorus in addition to normal red phosphorus for flame retardants, for example, red phosphorus whose surface is coated with a thermosetting resin, polyolefin, carboxylic acid polymer, titanium oxide or titanium aluminum condensate can be used.
- the carbon powder include carbon black, activated carbon, and graphite. This carbon black is prepared by any of the oil furnace method, gas furnace method, channel method, thermal method, or acetylene method. May be.
- the ratio is suitably 0.5 to 20% by weight, preferably 1 to 15% by weight, based on the total weight of the thermoplastic resin and the magnesium hydroxide solid solution.
- the synthetic resin, the magnesium hydroxide solid solution, and if necessary, the flame retardant aid may be mixed by a means known per se in the above-described ratio.
- the resin composition of the present invention may be used in combination with conventionally known reinforcing agents such as talc, mica, glass fiber, basic magnesium sulfate fiber and the like.
- the compounding amount of these reinforcing agents is 1 to 50 parts by weight with respect to 100 parts by weight of the resin.
- other conventional additives such as antioxidants, ultraviolet absorbers, lubricants, pigments such as carbon black, brominated or phosphate ester flame retardants, fillers such as calcium carbonate should be appropriately selected and blended. Can do.
- additives are added in an amount of 0.01 to 5 parts by weight of an antioxidant, 0.01 to 5 parts by weight of an ultraviolet absorber, 0.1 to 5 parts by weight of a lubricant, 0.01 to 5 parts by weight pigment, 0.1 to 100 parts by weight flame retardant, and 1 to 50 parts by weight filler.
- 700 mg of the sample powder is added to 70 ml of water, and subjected to a dispersion treatment for 3 minutes with ultrasonic waves (manufactured by NISSEI, MODEL US-300, current 300 ⁇ A). Then, 2-4 ml of the dispersion is taken and 250 ml of degassed water.
- the analyzer is operated and the suspension is circulated for 8 minutes, and then the particle size distribution is measured. The measurement is performed twice in total, and the arithmetic average value of the 50% cumulative secondary particle diameter obtained for each measurement is calculated to obtain the average secondary particle diameter of the sample.
- the pulverized product obtained in Example 3 was dispersed in water with a homogenizer to obtain a suspension of Sample 4.
- the coprecipitate suspension was wet pulverized with zirconia beads having a diameter of 0.05 mm to obtain a suspension of Sample 5 having an average secondary particle diameter of 50 nm.
- the suspension of sample 5 was wet-pulverized with zirconia beads having a diameter of 0.03 mm to obtain a suspension of sample 6 having an average secondary particle diameter of 20 nm.
- the sedimentation properties of these suspensions were measured and are shown in Table 2.
- the magnesium hydroxide solid solution of the present invention can make primary particles and secondary particles smaller than conventional magnesium hydroxide [Mg (OH) 2 ].
- Mg (OH) 2 magnesium hydroxide
- the reactivity with the acid is improved and the flame retardancy and mechanical strength with the resin are improved.
- the dehydration start temperature is lower than Mg (OH) 2 , and flame retardancy is improved.
- it is useful as a precursor of nano-level polymer fine particles MgO.
- Magnesium hydroxide is a phytoacid (gastric acid neutralizer), laxative, PVC stabilizer, ceramic raw material, heavy oil additive, flue gas desulfurizer, bitter fertilizer, food additive (magnesium fortifier), etc. It is used in various fields such as resin flame retardants (utilization of endothermic properties during thermal decomposition) that take advantage of special characteristics, and because of the relatively large primary particles and secondary particles, The problem of reaching the limit is solved, and further expansion of use is expected.
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Abstract
Description
Mg(OH)2-xRx (式1)
(但し式中Rは1価の有機酸を、xは0<x<1を表す。)
例えば、合成樹脂に対する難燃性の要求に応えるべく水酸化マグネシウム粒子等が注目されるようになった。水酸化マグネシウム粒子は、脱水開始温度が約340℃であるため、殆どの樹脂に適用できるという利点を有している。さらに、特許文献1では、良く結晶成長させた新しい水酸化マグネシウム粒子の合成法が開発されたため、これを使用して良好な成形品を得ることができるようになった。そこには、従来の水酸化マグネシウム粒子に比べて、構造上の歪が小さく、粒子の二次凝集が少なく、また水分子および空気の残留が小さい特定性状の水酸化マグネシウム粒子が提案されている。この水酸化マグネシウム粒子は、ポリオレフィン等の樹脂との親和性がよく、成形時にシルバー・ストリークの発生がなく、外観の優れた成形品を得ることができること、およびUL規格94VEにおいて、V-0を満足する難燃性のポリプロピレン樹脂成形品を得ることができること等が記載されている。
また、特許文献2には、レーザー回析散乱法で測定された平均二次粒子径が0.4~1.0μmである水酸化マグネシウム粒子よりなる難燃剤をポリオレフィンまたはその共重合体に使用する技術が、特許文献3には、特定の性状を有するハイドロタルサイト類化合物粒子に、レーザー回折散乱法により測定した平均二次粒子径が0.01~10μmである水酸化マグネシウムを一定量配合し、炭酸ガスによる発泡に対し抑制効果を持たせる技術が、それぞれ提案されている。
そこで、本発明は、従来の水酸化マグネシウムと比べ、1次粒子を小さくできるとともに、単分散に近いナノレベルの微粒子の水酸化マグネシウム系化合物を提供することを目的とする。更にMg(OH)2より脱水開始温度が下がった難燃性等の向上が期待できる水酸化マグネシウム系化合物を提供することを目的とする。また、更にナノレベルの高分散微粒子を製造でき、透明性の高い液状品を製造することを目的とする。
Mg(OH)2-xRx (式1)
但し式中Rは1価の有機酸を、xは0<x<1、好ましくは0<x≦0.2、を表す。xが1より大きい場合は水酸化マグネシウムに対する1価有機酸の固溶限界を超える。
(1)下記式1で表される水酸化マグネシウム系固溶体。
Mg(OH)2-xRx (式1)
但し式中Rは1価の有機酸を、xは0<x<1を表す。
(2)xが0<x≦0.2である上記(1)記載の水酸化マグネシウム系固溶体。
(3)1価の有機酸がギ酸、グリコール酸、乳酸の1種以上である上記(1)または(2)記載の水酸化マグネシウム系固溶体。
(4)平均2次粒子経が200nm以下である上記(1)ないし(3)のいずれかに記載の水酸化マグネシウム系固溶体。
(5)脱水開始温度が約300℃である上記(1)ないし(4)のいずれかに記載の水酸化マグネシウム系固溶体。
(6)高級脂肪酸類、高級脂肪酸のアルカリ金属塩、アニオン系界面活性剤、リン酸エステル類、シラン系、チタネート系、アルミニウム系のカップリング剤、多価アルコールと脂肪酸のエステル類、高級アルコールの硫酸エステル、珪素化合物、リン系化合物、アルミニウム系化合物、無機酸または有機酸、シリコーンからなる群から選ばれた少なくとも一種の表面処理剤により表面処理されている上記(1)ないし(5)のいずれかに記載の水酸化マグネシウム系固溶体。
(7)酸化マグネシウム(MgO)前駆体である上記(1)ないし(6)のいずれかに記載の水酸化マグネシウム系固溶体。
(8)上記(1)ないし(6)のいずれかに記載の水酸化マグネシウム系固溶体を有効成分とする合成樹脂用難燃剤。
(9)(a)合成樹脂 100重量部に対して、(b)上記(1)ないし(6)のいずれかに記載の水酸化マグネシウム系固溶体を0.1~50重量部配合することを特徴とする合成樹脂組成物及びその成型品。
(10)合成樹脂がポリオレフィンまたはその共重合体である上記(9)記載の合成樹脂組成物及びその成型品。
Mg(OH)2-xRx (式1)
(但し式中Rは1価の有機酸を、xは0<x<1)
Mg(OH)2-xRx (式1)
(但し式中Rは1価の有機酸を、xは0<x<1を表す。)
本発明の水酸化マグネシウム系固溶体の平均二次粒子経は300nm以下、好ましくは200nm以下、更に、好ましくは100nm以下である。
前駆体としては、例えば、マグネシウムアルコキシド(Mg(OR)2)、マグネシウムアセチルアセトン(Mg(acac)2)、水酸化マグネシウム(Mg(OH)2)、炭酸マグネシウム(MgCO2)、塩化マグネシウム(MgCl2)、硫酸マグネシウム(MgSO4)、硝酸マグネシウム(Mg(NO3)2)、シュウ酸マグネシウム(MgC2O4)の内のいずれか1種以上の化合物がすでに知られている。それら化合物によっては、通常、水和物の形態をとることもある。前駆体として、水和物を用いることもできる。酸化マグネシウム(MgO)前駆体は、例えば、多孔性半導体層を形成した後、絶縁性酸化物であるMgOの前駆体溶液を多孔性半導体層の表面側から塗布して熱処理を行う方法により、多孔性半導体層の触媒層側の表面(空孔の内表面を含む)をMgOで被覆して光電変換素子を作製するなどの使い方が可能である。また、保護層をなすMgOの成膜は、真空蒸着法やEB法、スパッタ法等の薄膜形成法の他に、MgOの前駆体である有機材料を用いた印刷法(厚膜形成法)等によって行うことができる。このうち印刷法では、例えば特許文献4に開示されているように、液体の有機材料をガラス材料と混合し、これをパネルガラス表面にスピンコートし、600℃付近で焼成することによりMgOを結晶化させて保護層を形成する。印刷法は真空蒸着法やEB法、スパッタ法に比べ、工程が比較的簡単で低コストで行えるメリットがあり、また真空プロセスを用いなくてもよいので、スループットの面からも優れている。
本発明の水酸化マグネシウム系固溶体は、樹脂と複合化する場合は表面処理することが好ましい。表面処理剤として、高級脂肪酸等のアニオン経界面活性剤、リン酸エステル、シランカップリング剤、チタネートカップリング剤、アルミニウムカップリング剤、シリコーン等が挙げられる。表面処理剤は、水酸化マグネシウムに対し好ましくは1~20重量%の量用いる。
表面処理は、湿式または乾式で行うことが好ましい。湿式とは、水とかアルコール等の溶媒に水酸化マグネシウム系固溶体を分散し、撹拌下に表面処理剤を添加する方法である。乾式とは、ヘンシェルミキサー等の高速撹拌機で撹拌下の粉末状の水酸化マグネシウム系固溶体に、表面処理剤を添加する方法である。
(A)水溶性マグネシウム塩と1価有機酸もしくはその塩との混合水溶液に、ほぼMgと等量のアルカリを加え共沈させる。必要に応じ、この後反応物のスラリーを必要に応じこの後、加熱熟成する。好ましくは100℃以上で水熱処理する。
(B)水溶性マグネシウム塩の水溶液に、アルカリの水溶液を加え共沈させた水酸化マグネシウムに、1価有機酸もしくはその塩を添加し、100℃以上で水熱処理する。
(C)(A)及び/または(B)法で得られた固溶体をビーズミル等による湿式粉砕処理を行い、2次粒子を更に小さくする方法により製造することができる。
アルカリとして、水酸化ナトリウム、水酸化カリウム等のアルカリ金属水酸化物、水酸化カルシウム等のアルカリ土類金属水酸化物、水酸化アンモニウム等が挙げられる。
1価有機酸としてギ酸、グリコール酸、乳酸等が挙げられ、その塩としてはナトリウム塩カリウム塩等水溶性の塩が挙げられる。
水熱処理後、濾過、水洗、乳化、表面処理、濾過、乾燥、粉砕、分級等の慣用の工程を適宜選択して行うことにより、本発明の水酸化マグネシウム系固溶体を製造できる。
本発明の樹脂組成物は、水酸化マグネシウム系固溶体を、樹脂100重量部に対し、0.1~100重量部、好ましくは1~50重量部配合して製造される。
樹脂と本発明水酸化マグネシウム系固溶体との混合、混練方法には特別の制約はなく、両者を均一に混合できる方法であればよい。例えば、1軸または2軸押出機、ロール、バンバリーミキサー等により混合、混練される。成型方法にも特別の制約はなく、樹脂およびゴムの種類、所望成型品の種類等に応じて、それ自体公知の成型手段を任意に採用できる。例えば射出成型、押出成型、ブロー成型、プレス成型、回転成型カレンダー成型、シートフォーミング成型、トランスファー成型、積層成型、真空成型等である。
さらに、エポキシ樹脂、フェノール樹脂、メラミン樹脂、不飽和ポリエステル樹脂、アルキド樹脂、尿素樹脂等の熱硬化性樹脂およびEPDM、ブチルゴム、イソプレンゴム、SBR,NBR,クロロスルホン化ポリエチレン、NIR、ウレタンゴム、ブタジエンゴム、アクリルゴム、シリコーンゴム、フッ素ゴム等の合成ゴムを例示することができる。
更に、慣用の他の添加材例えば酸化防止剤、紫外線吸収剤、滑剤、カーボンブラック等の顔料、臭素系とかリン酸エステル系の難燃剤、炭酸カルシウム等の充填剤を適宜選択して配合することができる。
これら添加材の配合量は、樹脂100重量部に対し、0.01~5重量部の酸化防止剤、0.01~5重量部の紫外線吸収剤、0.1~5重量部の滑剤、0.01~5重量部の顔料、0.1~100重量部の難燃剤、1~50重量部の充填剤である。
実施例中、水酸化マグネシウム系固溶体の(A)平均2次粒子径、(B)分解開始温度、(C)沈降性、(D)全光線透過率(透明性)は以下に記載する測定方法によって測定された。
(A)平均2次粒子径
MICROTRAC粒度分布計SPAタイプ(LEEDS&NORTHRUP INSTRUMENTS社製)を用いて測定決定する。
試料粉末700mgを70mlの水に加えて、超音波(NISSEI 社製、MODEL US-300,電流300μA)で3分間分散処理した後、その分散液の2-4mlを採って、250mlの脱気水を収容した上記粒度分布計の試料室に加え、分析計を作動させて8分間その懸濁液を循環した後、粒度分布を測定する。合計2回の測定を行い、それぞれの測定について得られた50%累積2次粒子径の算術平均値を算出して、試料の平均2次粒子径とする。
(B)分解開始温度
昇温速度5℃/分、大気雰囲気で測定したTG-DTAから決定。
(C)沈降性
固形物濃度25g/Lのサスペンジョンを50mLのメスシリンダーに入れ、上澄み液部の液量の経時変化を測定する。
(D)全光線透過率(透明性)
JIS K-7361に準じて測定。
この懸濁液にギ酸ナトリウム65gを投入して混ぜ合わせた。次にこの懸濁液を1L容量のオートクレーブにて140℃で2時間熟成した。熟成後、懸濁液を固液分離、洗浄、脱水、乾燥、粉砕することで試料1を得た。
1.5mol/Lの塩化マグネシウム溶液320mLを入れた1L容量のステンレス製反応槽に、撹拌下で3mol/Lの水酸化ナトリウム溶液320mL投入し、水酸化マグネシウム懸濁液を作製した。
得られた懸濁液を1L容量のオートクレーブにて150℃で2時間熟成した。熟成後、懸濁液を固液分離、洗浄、脱水、乾燥、粉砕した。
水酸化マグネシウムは、制酸剤(胃酸中和剤)、緩下剤、塩ビの安定剤、セラミック原料、重油添加剤、排煙脱硫剤、苦土肥料、食品添加剤(マグネシウム強化剤)等と、物理的特徴を生かした樹脂の難燃剤(熱分解時の吸熱性の利用)等多方面で使用されているところ、1次粒子および2次粒子が比較的大きいために、種々の利用分野で性能の限界に達しているという問題点が解決され、さらなる利用拡大が期待される。
Claims (10)
- 下記式(1)で表される水酸化マグネシウム系固溶体。
Mg(OH)2-xRx (式1)
但し式中Rは1価の有機酸を、xは0<x<1を表す。 - xが0<x≦0.2である請求項1記載の水酸化マグネシウム系固溶体。
- 1価の有機酸がギ酸、グリコール酸、乳酸の1種以上である請求項1または2記載の水酸化マグネシウム系固溶体。
- 平均2次粒子経が200nm以下である請求項1ないし3のいずれかに記載の水酸化マグネシウム系固溶体。
- 脱水開始温度が約300℃である請求項1ないし4のいずれかに記載の水酸化マグネシウム系固溶体。
- 高級脂肪酸類、高級脂肪酸のアルカリ金属塩、アニオン系界面活性剤、リン酸エステル類、シラン系、チタネート系、アルミニウム系のカップリング剤、多価アルコールと脂肪酸のエステル類、高級アルコールの硫酸エステル、珪素化合物、リン系化合物、アルミニウム系化合物、無機酸または有機酸、シリコーンからなる群から選ばれた少なくとも一種の表面処理剤により表面処理されている請求項1ないし5のいずれかに記載の水酸化マグネシウム系固溶体。
- 酸化マグネシウム(MgO)前駆体である請求項1ないし6のいずれかに記載の水酸化マグネシウム系固溶体。
- 請求項1ないし6のいずれかに記載の水酸化マグネシウム系固溶体を有効成分とする合成樹脂用難燃剤。
- (a)合成樹脂 100重量部に対して、(b)請求項1ないし6のいずれかに記載の水酸化マグネシウム系固溶体を0.1~50重量部配合することを特徴とする合成樹脂組成物及びその成型品。
- 合成樹脂がポリオレフィンまたはその共重合体である請求項9記載の合成樹脂組成物及びその成型品。
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CN201580045348.5A CN106573869A (zh) | 2014-08-26 | 2015-08-25 | 新型氢氧化镁系固溶体、及含有其的树脂组合物以及高活性氧化镁的前驱物 |
KR1020177001176A KR20170047212A (ko) | 2014-08-26 | 2015-08-25 | 신규 수산화마그네슘계 고용체, 및 그것을 포함하는 수지 조성물 및 고활성 산화마그네슘의 전구체 |
ES15835860T ES2751278T3 (es) | 2014-08-26 | 2015-08-25 | Nueva solución sólida a base de hidróxido de magnesio y composición de resina y precursor para óxido de magnesio altamente activo que incluye los mismos |
EP15835860.6A EP3187483B1 (en) | 2014-08-26 | 2015-08-25 | Novel magnesium hydroxide-based solid solution, and resin composition and precursor for highly active magnesium oxide which include same |
US15/506,454 US10233305B2 (en) | 2014-08-26 | 2015-08-25 | Magnesium hydroxide-based solid solution, and resin composition and precursor for highly active magnesium oxide which include same |
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CN109052437B (zh) * | 2018-09-19 | 2020-07-07 | 常州大学 | 一种由纳米粒子组成的花状形貌的介孔氧化镁的制备方法 |
KR20200077133A (ko) | 2018-12-20 | 2020-06-30 | 빈운택 | 스마트 건조 시스템 |
CN113086998B (zh) * | 2021-04-07 | 2022-06-24 | 长治学院 | 一种Mg6Al2(OH)18·4.5H2O纳米片及其制备方法和应用 |
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EP3187483A1 (en) | 2017-07-05 |
TW201615647A (zh) | 2016-05-01 |
EP3187483B1 (en) | 2019-08-14 |
US10233305B2 (en) | 2019-03-19 |
US20170260356A1 (en) | 2017-09-14 |
KR20170047212A (ko) | 2017-05-04 |
JPWO2016031803A1 (ja) | 2017-06-08 |
CN106573869A (zh) | 2017-04-19 |
ES2751278T3 (es) | 2020-03-31 |
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