WO2006090446A1 - 水酸化マグネシウム、その製造方法及びその水酸化マグネシウムからなる難燃剤並びにその水酸化マグネシウムを含む難燃性樹脂組成物 - Google Patents
水酸化マグネシウム、その製造方法及びその水酸化マグネシウムからなる難燃剤並びにその水酸化マグネシウムを含む難燃性樹脂組成物 Download PDFInfo
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- WO2006090446A1 WO2006090446A1 PCT/JP2005/002914 JP2005002914W WO2006090446A1 WO 2006090446 A1 WO2006090446 A1 WO 2006090446A1 JP 2005002914 W JP2005002914 W JP 2005002914W WO 2006090446 A1 WO2006090446 A1 WO 2006090446A1
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- magnesium hydroxide
- magnesium
- solution
- alkaline solution
- resin
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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
- 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
- C01P2006/80—Compositional purity
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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
Definitions
- MAGNESIUM HYDROXIDE PROCESS FOR PRODUCING THE SAME, AND FLAME RETARDANT COMPRISING THE MAGNESIUM HYDROXIDE AND FLAME RETARDANT RESIN COMPOSITION CONTAINING THE MAGNESIUM HYDROXIDE
- the present invention relates to magnesium hydroxide having a high specific surface area and a method for producing the same, and more particularly, magnesium hydroxide which can impart excellent reinforcing effect as well as flame retardancy by being blended with a resin It relates to the manufacturing method. Further, the present invention relates to a flame retardant which is the magnesium hydroxide and a flame retardant resin composition containing the magnesium hydroxide.
- thermoplastic resins are excellent in moldability as well as in mechanical properties and electrical properties.
- halogen-based flame retardants such as tetrabromobisphenol A and decab-port modiphenyl oxide are used.
- Blended flame retardant resin compositions are widely used, for example, in various industrial fields such as construction, electricity, machinery, transportation and the like.
- polyvinyl chloride resin compositions containing halogen-based flame retardants are excellent in flame retardancy, and therefore covering materials such as molded articles such as various building materials including floor materials, electric wires, cables, etc. It is widely used. However, such articles and coatings can cause serious environmental problems due to the generation of toxic gases once burned.
- metal hydroxides such as magnesium hydroxide and aluminum hydroxide have attracted attention from the environmental viewpoint such as generation of toxic gas such as hydrogen halide at the time of combustion which hardly generates dioxin at the time of incineration.
- This metal hydroxide is used as a flame retardant for plastics and the like because it thermally decomposes at the time of combustion to release water and absorb heat, and the thermal decomposition temperature of aluminum hydroxide is 200-350 ° C, water Since the thermal decomposition temperature of magnesium oxide is 340-490C, it can be said that magnesium hydroxide is more advantageous as a flame retardant.
- the flame retardancy is improved by uniformly dispersing a metal hydroxide having a high specific surface area, which has a specific surface area of the metal hydroxide as a factor governing the flame retardancy, and is uniformly dispersed in a resin.
- the upper limit of the specific surface area of magnesium hydroxide which is conventionally obtained, is about 30 m 2 / g.
- Patent Document 1 discloses magnesium hydroxide particles having a specific surface area of more than 30 m 2 / g
- the paragraph 0039 of the document only states that the specific surface area of the flame retardant is preferably 30 to 90 m 2 / g.
- the upper limit value of the specific surface area of the flame retardant described in the examples is only 62 m 2 / g, and a specific surface area of this level can not ensure sufficient flame retardancy.
- metal hydroxides such as magnesium hydroxide must be added in large amounts to the resin in order to impart effective flame retardancy to the resin composition, while metal hydroxides.
- the compound is a hydrophilic inorganic substance having a hydroxyl group, and has a problem that the dispersibility or compatibility with the resin which is an organic polymer substance is low and the dispersibility is poor.
- a metal hydroxide is compounded in a large amount into a resin to make a flame retardant resin composition, there is a risk that the resin itself may lose its desirable properties and characteristics.
- seawater-derived magnesium hydroxide has the advantage of having a small particle size that affects the properties and appearance of the resin, which has few impurities such as iron that affect the heat aging resistance of the resin, etc. It is often used.
- the purification process for highly purifying the seawater-derived magnesium hydroxide requires a large cost.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-129056
- the present invention has been made in view of the problems of the prior art, and its object is to provide magnesium hydroxide having a large specific surface area. Another object of the present invention is to provide a flame retardant having excellent dispersibility in resin. Furthermore, an object of the present invention is to provide a method by which magnesium hydroxide can be produced at low cost. An object of the present invention is to provide a flame retardant resin composition which is excellent in flame retardancy and high in mechanical strength.
- magnesium hydroxide of the present invention is magnesium hydroxide which can be obtained by chemically decomposing a magnesium-containing substance with an acid solution and then adjusting the pH with an alkaline solution. It is characterized by having a specific surface area of 95 to 300 m 2 / g. Further, the flame retardant of the present invention is characterized in that strong magnesium hydroxide is surface-treated with a surface treatment agent.
- the method for producing magnesium hydroxide of the present invention is a method for producing magnesium hydroxide by chemically decomposing a magnesium-containing substance with an acid solution and then adjusting the pH using an alkaline solution.
- a magnesium-containing substance is chemically decomposed by immersing it in an acid solution, and an alkaline solution is added to the obtained acid solution to obtain a weakly alkaline primary alkaline solution, and after removing impurities in the primary alkaline solution, the primary alkaline solution is further treated.
- An alkaline solution is added to the solution to obtain a strongly alkaline secondary alkaline solution, and magnesium hydroxide is precipitated in the secondary alkaline solution.
- the flame retardant resin composition of the present invention is characterized in that 50 to 200 parts by weight of the above-mentioned flame retardant is blended with 100 parts by weight of resin.
- magnesium hydroxide of the present invention By combining the magnesium hydroxide of the present invention with the sealing material, rubber, resin for wire covering material, etc., it is possible to maintain high mechanical strength while imparting high flame retardancy.
- Substances such as asbestos and asbestos-containing serpentinite, sepiolite, talc etc. are harmful to asbestos.
- the industrial use of asbestos is regulated worldwide.
- these substances are chemically Can be decomposed into non-asbestos, and can be regenerated as safe and highly functional magnesium hydroxide.
- asbestos has been used for many industrial materials so far, and the present invention is effective as a recycling means in the case of dismantling these building materials, which are particularly used as building materials, and becoming waste.
- the present invention can provide extremely effective means for utilizing the limited global resources.
- FIG. 1 is a schematic view showing the flow of an example of the method for producing magnesium hydroxide of the present invention.
- FIG. 2 is a schematic view showing a flow of a method for producing magnesium hydroxide of a comparative example.
- the magnesium hydroxide of the present invention has a high specific surface area, and the production process of the present invention for obtaining magnesium hydroxide with a high specific surface area has steps not found in conventional methods. And will be described in detail below.
- the reaction synthesis method includes, for example, a method of adding a slurry of caustic or slaked lime to seawater or bittern to make a reaction, a method of adding sodium hydroxide to magnesium hydroxide slurry and subjecting it to hydrothermal treatment (for example, JP-B 50-23680), a method of subjecting a basic magnesium salt slurry to hydrothermal treatment (eg, JP-A-52-115799), a method of reacting a magnesium salt solution with ammonia (eg, JP-A-61- No. 168522) and the like are known.
- the synthesized magnesium hydroxide is washed, surface-treated, dewatered, dried and pulverized to obtain a magnesium hydroxide flame retardant.
- natural mineral pulverization is a method of pulverizing natural brucite ore mainly composed of magnesium hydroxide and surface-treating it to make a magnesium hydroxide flame retardant, and the natural bullite site ore
- a method of wet-pulverizing as a slurry, surface-treating the pulverized product slurry with an emulsion of ammonium salt or amine salt of fatty acid, solid-liquid separation and drying for example, Japanese Patent Publication No. 7-42461). Issue).
- Magnesium hydroxide obtained by a reaction synthesis method has relatively well-defined particle properties and a fine and uniform particle size, so even if it is highly loaded in a resin, the decrease in mechanical properties is suppressed relatively small. Can be expected.
- the reaction synthesis method is economically disadvantageous because the production process is more complicated than the natural mineral grinding method, and the energy cost is required.
- the magnesium hydroxide flame retardant produced by the natural mineral powder method is a flame retardant having a relatively low cost and excellent economy, since it uses inexpensive natural brucite ore as a raw material. .
- the flame retardant effect of the magnesium hydroxide based flame retardant is far lower than that of the halogen based flame retardant, it is necessary to be blended in a large amount in the resin.
- magnesium hydroxide having a small specific surface area is used, sufficient flame retardancy may not be obtained unless it is blended in a large amount in the resin, resulting in the above-mentioned defects.
- the impurities can be made effective by a simple method of chemically decomposing a magnesium-containing substance with an acid solution and further adding an alkali solution to the acid solution to perform two-stage pH adjustment. It is possible to obtain hydroxide hydroxide with much higher specific surface area than conventional ones. And, by blending a flame retardant comprising such high specific surface area magnesium hydroxide in the resin, it is possible to provide a flame retardant resin composition which is excellent in flame retardancy and high in mechanical strength. .
- a magnesium-containing substance is chemically decomposed by immersing it in an acid solution, and an alkaline solution is added to the obtained acid solution to obtain a weakly alkaline primary alkaline solution, and the primary alkaline solution is obtained.
- an alkaline solution is further added to the primary alkaline solution to obtain a strongly alkaline secondary alkaline solution, and magnesium hydroxide is precipitated in the secondary alkaline solution, the first step for removing impurities Impurities can be effectively removed by the two-stage reaction of the second stage for precipitation of magnesium hydroxide and as a result, the purity of the resultant hydrous magnesium oxide can be improved.
- the resulting magnesium hydroxide contains iron, aluminum and calcium. And so on, so that the purity is lowered.
- magnesium-containing substance examples include asbestos, serpentine, vermiculite, talc, sepiolite, atapulgite, dolomite and the like.
- Examples of the acid for chemically decomposing the magnesium-containing substance include, but are not limited to, hydrochloric acid, sulfuric acid, nitric acid and the like.
- this acid solution is added by an amount of about 10 to 20% excess of the theoretical amount that is preferable to add the amount of the acid necessary for the dissolution of all MgO in the magnesium-containing material.
- Mg ⁇ are particularly preferable because they can be eluted without remaining.
- an alkaline solution used to adjust the pH of an acid solution in which a magnesium-containing substance is dissolved Is not limited, but may be sodium hydroxide, potassium hydroxide, sodium carbonate, ammonium hydroxide and the like.
- the pH of the primary alkaline solution is preferably 7.5 to 8.5.
- an alkaline aqueous solution is added to the primary alkaline solution to obtain a secondary alkaline solution.
- a secondary alkaline solution For example, when an alkaline aqueous solution is added to a primary alkaline solution having a pH of 8, the pH rises while producing a small amount of hydroxylated magnesium. Furthermore, when the addition of alkaline aqueous solution is continued, the rise of pH is stagnated at pH around 10.5, and precipitation of magnesium hydroxide proceeds. And, when the precipitation of magnesium hydroxide is completed, the pH rises rapidly. This is because magnesium and hydroxyl group react best at pH around 10.5.
- the pH of the secondary alkaline solution is preferably 10.0-11.0.
- magnesium hydroxide having a purity of 99% or more and a specific surface area of 95 to 300 m 2 / g.
- magnesium hydroxide having a specific surface area of less than 95 m 2 / g, sufficient flame retardancy can not be obtained.
- magnesium hydroxide having a specific surface area of more than 300 m 2 / g is subjected to the surface treatment described later, good dispersibility in the resin may not be obtained.
- magnesium hydroxide having a specific surface area of 100 to 200 m 2 Zg is particularly preferred. Magnesium hydroxide with a specific surface area of less than 100 m 2 Zg may not provide sufficient flame retardancy and reinforcement effects, and even if magnesium hydroxide with a specific surface area of greater than 200 m 2 / g is used, flame retardancy and reinforcement may be achieved. Of effect This is because further improvement can not be expected, and in some cases, good dispersibility in the resin may not be obtained.
- magnesium hydroxide is pulverized and subjected to a refining treatment, and then the magnesium hydroxide particles are surface-treated with a surface treatment agent.
- a flame retardant can be obtained by processing.
- a surface treatment agent is added to the slurry of magnesium hydroxide to wet-surface-treat magnesium hydroxide, and then dried.
- the flame retardant can be obtained by pulverizing.
- the surface treatment agent at least one member selected from the group consisting of silane coupling agents or higher fatty acids, higher fatty acid metal salts, higher fatty acid esters, higher fatty acid amides, higher alcohols or hydrogenated oils can be used. .
- Such surface treatment agents are generally preferably used in the range of 0.5 to 5.0% by weight with respect to magnesium hydroxide.
- the amount of the surface treatment agent is less than 0.5% by weight, the tensile elongation of the resin composition is lowered, and the flowability and the formability of the kneaded product containing the resin and the surface treatment agent are lowered.
- the amount of the surface treatment agent is more than 5.0% by weight, the flame retardancy and mechanical properties decrease.
- the surface treatment agent is a coating layer that covers the surface of the magnesium hydroxide particles, and higher fatty acid means 8 or more carbon atoms and preferably 30 or less carbon atoms, and may be linear or branched, or may be saturated or not. It doesn't matter if it's saturated.
- Such a surface treatment agent is excellent in dispersibility in powder, improves fluidity when mixed with resin, and improves mechanical strength when compounded.
- silane coupling agent non-limiting examples of which include, but are not limited to, for example, vinylethoxysilane, buturis (2-methoxymethoxy) silane, ⁇ -methacryloxypropyltrimethoxysilane, ⁇ -aminopropyl Examples thereof include trimethoxysilane, j3- (3,4-epoxycyclohexyl) ethoxyletrimethoxysilane, ⁇ _glucidoxypropyltrimethoxysilane, and ⁇ -mercaptopropyltrimethoxysilane.
- titanate coupling agents and aluminum coupling agents can also be used.
- higher fatty acids include, but are not limited to, stearic acid, foreic acid, palmitic acid, linoleic acid, lauric acid, purilic acid, behenic acid and montanic acid. It is possible to do S.
- Examples of higher fatty acid metal salts include, but are not limited to, stearic acid, oleic acid salt, palmitic acid salt, lino mononoyl acid salt, lauric acid salt, purilic acid salt, Mention may be made of helic acid salts and montanic acid salts, and examples of metals include Na, K, Al, Ca, Mg, Zn, Ba and the like.
- higher fatty acid esters include, but are not limited to, methyl laurate, methyl myristate, methyl palmitate, methyl stearate, methyl oleate, methyl erucate, behenic acid, for example.
- examples thereof include fatty acid higher alcohol esters, phenyl behenate and cetyl myristate.
- higher fatty acid amides include, but are not limited to, stearic acid amide, oleic acid amide, palmitic acid amide, linoleic acid amide, lauric acid amide, purilic acid amide, Examples thereof include nicotinic acid amide and montanic acid amide.
- higher alcohols include, but are not limited to, octyl alcohol, decyl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol and the like.
- Examples of the hardened oil include beef tallow hardened oil, castor hardened oil and the like.
- the grinder is equipped with a heating means so that the coating of the magnesium hydroxide particles with the surface treatment agent can be performed promptly.
- a heating means such as a jacket through which hot water flows or an electric heater.
- the grinding media alumina balls, zircoia balls, metal balls, metal rods, etc. that can be harder than magnesium hydroxide can be used, and the grinding media or the casing of the grinding machine is worn away during grinding.
- the coloring agent from Ceramics such as mina zirconia are preferred.
- the flame retardant resin composition of the present invention can be obtained by uniformly blending the above-mentioned flame retardant with a resin.
- the blending ratio of magnesium hydroxide to resin varies depending on the use and required properties of the resin composition to be obtained, usually, the above-mentioned flame retardant is uniformly blended in 50 to 200 parts by weight with respect to 100 parts by weight of resin.
- the ability to obtain the flame retardant resin composition of the invention S can be obtained.
- a resin obtained by blending 50 to 100 parts by weight of the above-mentioned flame retardant with 100 parts by weight of resin. Compositions are preferably used.
- a resin composition comprising 100 parts by weight of the above-mentioned flame retardant per 100 parts by weight of resin is preferably used, .
- the blending amount of the flame retardant exceeds 200 parts by weight with respect to 100 parts by weight of the resin, there is fear that the preferable mechanical properties of the resin are deteriorated.
- thermosetting resins such as phenol resin, epoxy resin, unsaturated polyester, polyurethane and the like can also be used as the resin. These resins can be used alone or in combination of two or more. Among these, polyolefin resins are preferred because they have a large flame retardant effect by magnesium hydroxide.
- other additives can be added as needed in addition to the above-mentioned flame retardant.
- additives for example, plasticizers, lubricants, fillers, antioxidants, heat stabilizers, crosslinking agents, crosslinking aids, antistatic agents, compatibilizers, light stabilizers, pigments, foaming agents And anti-static agents and the like.
- Such a resin composition is required to be added to the above-mentioned flame retardant by an appropriate kneading means such as, for example, a single-screw extruder, a twin-screw extruder, a roll kneader, a kneader, a Banbury-one mixer, etc. It can obtain by mixing and knead
- the flame-retardant resin composition of the present invention thus obtained can be appropriately selected from, for example, injection molding, extrusion molding, blow molding, press molding, vacuum molding, calendar molding, transfer molding, etc. according to the application and purpose.
- the force S can be suitably used for the production of various molded articles.
- a powder obtained by grinding and classifying serpentine (passed through a 50 mesh screen, average particle diameter 300 zm, BET specific surface area 8 m 2 / g) is suspended in water to obtain a slurry, On the other hand, a 15% excess of sulfuric acid (concentration 98%) was slowly added to the theoretical amount required for the dissolution of total MgO in the serpentine, and the solution was stirred for 2 hours while heating to 100.degree.
- the slurry was filtered to obtain a magnesium sulfate solution.
- the pH of the solution was adjusted to 10.5 by adding a 20% sodium hydroxide solution to the primary alkaline solution from which impurities were removed while stirring, and stirring was continued for 2 hours to precipitate magnesium hydroxide.
- the magnesium hydroxide was recovered by filtering the secondary alkaline solution, and the magnesium hydroxide was washed with pure water and then dried.
- sodium sulfate is recovered as a residue by concentrating the alkali solution after extraction of magnesium hydroxide from the secondary alkali solution, and this can be used as a raw material for required industrial use.
- Magnesium hydroxide of the present invention example 1 obtained through the above steps (1) and (5) and magnesium hydroxide of a comparative example obtained by reacting sodium hydroxide in seawater and adding them The results of measuring the specific surface area and the purity are as follows.
- the specific surface area was measured by the BET three-point method, and the purity was measured by the fluorescent X-ray method.
- the specific surface area of the magnesium hydroxide of Example 1 of the present invention is 6 times or more than that of magnesium hydroxide obtained by the conventional seawater extraction method, and the magnesium hydroxide of Example 1 of the present invention is the seawater extraction method. It is more pure than the magnesium hydroxide obtained.
- the magnesium hydroxide of Example 1 of the present invention obtained through the above steps (1) and (5), or magnesium hydroxide of a comparative example obtained by adding sodium hydroxide to seawater and reacting them And 180 weight per 100 weight parts of resin (ethylene-ethylene-acrylic acid ethyl copolymer, trade name "A-1150” manufactured by Nippon Polyethylene Corporation) used for wire coating
- resin ethylene-ethylene-acrylic acid ethyl copolymer, trade name "A-1150” manufactured by Nippon Polyethylene Corporation
- the following molding conditions were obtained by blending parts by weight and further blending 0.5. 5 parts by weight of these resins with an antioxidant (Hindered phenol, trade name “Irganox” manufactured by Ciba Geigy Co., Ltd.).
- the test piece for tensile stress measurement is formed into a size of 2 mm ⁇ 105 mm ⁇ 125 mm in width, and the test piece for ignition time and average heating rate measurement is 2 mm in thickness ⁇ 100 mm in width ⁇ X width It was molded into a size of 100 mm, and tensile stress (MPa), ignition time (seconds) and average heat generation rate (kWZm 2 ) were measured. The results are shown in Table 1.
- the tensile stress was measured by a method in accordance with JIS-K7113, and the ignition time (seconds) and the average heat generation rate were measured by a method in accordance with ISO 5560-1.
- Molding conditions After kneading for 20 minutes at 140 ° C using a roll mill, pressing was carried out at 150 ° C and a pressure of 17 MPa for 2 minutes.
- Pulverized and classified waste materials of asbestos-containing building materials contained, as The powder (which passed through the open 450 ⁇ m screen) was recovered.
- the asbestos powder is suspended in water to obtain a slurry, to which a 15% excess of sulfuric acid (98% concentration) in excess of the theoretical amount required to dissolve all the MgO in the asbestos is slowly added.
- the mixture was stirred for 2 hours while heating to 100 ° C.
- the slurry was filtered to obtain a magnesium sulfate solution.
- the pH of the solution was adjusted to 8 by stirring while adding 20% sodium hydroxide solution to the magnesium sulfate solution.
- impurities such as iron hydroxide
- the pH of the solution was adjusted to 10.5 by adding a 20% sodium hydroxide solution to the primary alkaline solution from which impurities were removed while stirring, and stirring was continued for 2 hours to precipitate magnesium hydroxide.
- the magnesium hydroxide was recovered by filtering the secondary alkaline solution, and the magnesium hydroxide was washed with pure water and then dried.
- Magnesium hydroxide of the present invention example 2 obtained through the above steps (1) and (6) and a commercial product which is a comparative example (specific surface area 7 m 2 / g, trade name of Kyowa Chemical Co., Ltd.)
- the magnesium hydroxide of “Kismar 5A” was subjected to a dispersion treatment in water for 5 minutes using an ultrasonic dispersion apparatus (trade name “DG 2000” manufactured by Zitech Co., Ltd.), and then the specific surface area and purity were measured.
- the results are as follows.
- the specific surface area was measured by the BET three-point method, and the purity was measured by the fluorescent X-ray method.
- the specific surface area of the magnesium hydroxide of Inventive Example 2 is 8 times that of the commercially available magnesium hydroxide, and the magnesium hydroxide of Inventive Example 2 has a higher purity than the commercially available magnesium hydroxide. .
- magnesium hydroxide of Example 2 of the present invention obtained through the above steps (1) and (6), stearic acid is added to the magnesium hydroxide powder of the present invention before it is added to the resin described later. After addition of 2.5% by weight and mixing in ethanol for 10 minutes, ethanol was stripped off at 60 ° C., followed by vacuum drying.
- the surface-treated magnesium hydroxide powder according to the present invention and the commercially available magnesium hydroxide powder are resins used for wire coating (ethylene-co-acetic acid bule copolymer, manufactured by Nippon Polyethylene Co., Ltd.) 150 parts by weight to 100 parts by weight of “Novatec E VA”, and an antioxidant (Hindered phenol-based, trade name “Irganox” manufactured by Ciba Geigy Co., Ltd.) was added to these resins. Test pieces of the same size were molded under the same molding conditions as in Example 1 for 0.5 parts by weight of the compound, and the bow I tensile stress (MPa), the ignition time (seconds) and the average heating rate (kW / m 2 ) was measured. The results are shown in Table 2.
- the measurement method of the tensile stress, the ignition time (seconds) and the average heat generation rate is the same as in Example 1.
- the magnesium hydroxide is treated with a surface treatment agent to form a resin of magnesium hydroxide. It can be seen that it can be uniformly dispersed in it and improve mechanical properties and flame retardancy.
- An acid was obtained by the same process as in Example 1 (see the flow in FIG. 1) except that a powder obtained by crushing and classifying serpentine (a powder which passed through a screen with an aperture of 450 ⁇ m) was used as the magnesium-containing material.
- Chemical decomposition of a magnesium-containing substance by solution, filtration of a magnesium-containing slurry, preparation of a primary alkaline solution, preparation of a secondary alkaline solution, and recovery of magnesium hydroxide are carried out according to Invention Example 3 of the present invention. Magnesium hydroxide was obtained.
- the preparation process of the primary alkaline solution is removed from the manufacturing flow of magnesium hydroxide shown in FIG. 1 (the one without impurity removal process, FIG. 2) (see flow). That is, using the powder obtained by crushing and classifying the serpentine, which is a magnesium-containing material, as a process of the comparative example (a powder passing through a 450 ⁇ m screen), the same method as in Example 1 is used. Chemical decomposition of magnesium-containing material with acid solution and filtration of magnesium-containing slurry, and magnesium sulfate solution obtained after filtration of magnesium-containing slurry 20. /.
- the pH of the solution was adjusted to 10.5 while stirring with sodium hydroxide solution, and magnesium hydroxide was precipitated by continuing stirring for 2 hours.
- the magnesium hydroxide was recovered by filtering the alkali solution containing magnesium hydroxide, and the magnesium hydroxide was washed with pure water and then dried to obtain the magnesium hydroxide of the comparative example.
- the specific surface area was measured by the BET three-point method, and the purity was measured by the fluorescent X-ray method.
- magnesium hydroxide of Example 3 of the present invention has high purity
- the magnesium hydroxide of Comparative Example has low purity because impurities are removed and there is no impurity.
- FIG. 1 is a schematic view showing a flow of an example of the method for producing magnesium hydroxide of the present invention.
- FIG. 2 is a schematic view showing a flow of a method for producing magnesium hydroxide of a comparative example.
- the present invention can use asbestos or asbestos separated from asbestos-containing minerals or industrial products containing asbestos as a magnesium-containing substance. Therefore, according to the present invention, asbestos-containing materials can be used as industrial products with high added value. It can be played back.
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2005/002914 WO2006090446A1 (ja) | 2005-02-23 | 2005-02-23 | 水酸化マグネシウム、その製造方法及びその水酸化マグネシウムからなる難燃剤並びにその水酸化マグネシウムを含む難燃性樹脂組成物 |
CN2005800482342A CN101119931B (zh) | 2005-02-23 | 2005-02-23 | 氢氧化镁的制造方法 |
US11/816,967 US20100069555A1 (en) | 2005-02-23 | 2005-02-23 | Magnesium hydroxide, method for producing magnesium hydroxide and a fire retardant comprising the magnesium hydroxide, and a fire-retarded resin composition containing the magnesium hydroxide |
JP2005512262A JP4303724B2 (ja) | 2005-02-23 | 2005-02-23 | 水酸化マグネシウム、その製造方法及びその水酸化マグネシウムからなる難燃剤並びにその水酸化マグネシウムを含む難燃性樹脂組成物 |
CA002597863A CA2597863A1 (en) | 2005-02-23 | 2005-02-23 | Magnesium hydroxide, method for producing thereof and fire-retardant comprising the magnesium hydroxide, and fire-retardant resin composition containing the magnesium hydroxide |
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PCT/JP2005/002914 WO2006090446A1 (ja) | 2005-02-23 | 2005-02-23 | 水酸化マグネシウム、その製造方法及びその水酸化マグネシウムからなる難燃剤並びにその水酸化マグネシウムを含む難燃性樹脂組成物 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011006600A (ja) * | 2009-06-26 | 2011-01-13 | Yokohama Rubber Co Ltd:The | 無機フィラー系難燃剤およびこれを用いる湿気硬化型樹脂組成物 |
JP2016515988A (ja) * | 2013-10-29 | 2016-06-02 | オトクリトエ アクツィオネルノエ オブシェストヴォ “カウスティク” | 水酸化マグネシウム難燃剤ナノ粒子及びその生産方法 |
Families Citing this family (4)
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FR2888243B1 (fr) * | 2005-07-06 | 2007-09-14 | Michelin Soc Tech | Composition de caoutchouc pour pneumatique renforcee de plaquettes d'hydroxyde de magnesium. |
CN102417196B (zh) * | 2011-09-16 | 2014-02-12 | 沈阳化工大学 | 一种阻燃剂型氢氧化镁的生产方法 |
CN112777617B (zh) * | 2021-02-18 | 2022-08-12 | 西部矿业集团有限公司 | 一种工业级氢氧化镁微波法制备阻燃剂用氢氧化镁的方法 |
CN115403872A (zh) * | 2022-09-29 | 2022-11-29 | 广东聚石化学股份有限公司 | 一种阻燃弹性复合材料及其制备方法和应用 |
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JPS60100302A (ja) * | 1983-11-02 | 1985-06-04 | 日立電線株式会社 | 難燃性電気絶縁組成物 |
JPH03170324A (ja) * | 1989-11-27 | 1991-07-23 | Mitsubishi Materials Corp | 水酸化マグネシウムの表面処理方法 |
JP2001302232A (ja) * | 2000-04-19 | 2001-10-31 | Ube Material Industries Ltd | 高分散性高純度水酸化マグネシウム粉末及びその製造方法、及び水酸化マグネシウムスラリー |
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US6784023B2 (en) * | 1996-05-20 | 2004-08-31 | Micron Technology, Inc. | Method of fabrication of stacked semiconductor devices |
ES2284278T3 (es) * | 1998-12-14 | 2007-11-01 | Kyowa Chemical Industry Co., Ltd. | Particulas de hidroxido de magnesio, metodo de produccion de las mismas, composicion de resina que contiene las mismas. |
JP2002359346A (ja) * | 2001-05-30 | 2002-12-13 | Sharp Corp | 半導体装置および半導体チップの積層方法 |
TWI303873B (en) * | 2005-09-23 | 2008-12-01 | Freescale Semiconductor Inc | Method of making stacked die package |
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2005
- 2005-02-23 CN CN2005800482342A patent/CN101119931B/zh not_active Expired - Fee Related
- 2005-02-23 JP JP2005512262A patent/JP4303724B2/ja active Active
- 2005-02-23 US US11/816,967 patent/US20100069555A1/en not_active Abandoned
- 2005-02-23 WO PCT/JP2005/002914 patent/WO2006090446A1/ja active Application Filing
- 2005-02-23 CA CA002597863A patent/CA2597863A1/en not_active Abandoned
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JPS60100302A (ja) * | 1983-11-02 | 1985-06-04 | 日立電線株式会社 | 難燃性電気絶縁組成物 |
JPH03170324A (ja) * | 1989-11-27 | 1991-07-23 | Mitsubishi Materials Corp | 水酸化マグネシウムの表面処理方法 |
JP2001302232A (ja) * | 2000-04-19 | 2001-10-31 | Ube Material Industries Ltd | 高分散性高純度水酸化マグネシウム粉末及びその製造方法、及び水酸化マグネシウムスラリー |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011006600A (ja) * | 2009-06-26 | 2011-01-13 | Yokohama Rubber Co Ltd:The | 無機フィラー系難燃剤およびこれを用いる湿気硬化型樹脂組成物 |
JP2016515988A (ja) * | 2013-10-29 | 2016-06-02 | オトクリトエ アクツィオネルノエ オブシェストヴォ “カウスティク” | 水酸化マグネシウム難燃剤ナノ粒子及びその生産方法 |
JP2017036449A (ja) * | 2013-10-29 | 2017-02-16 | ジョイント ストック カンパニー カウスティク | 水酸化マグネシウム難燃剤ナノ粒子及びその生産方法 |
Also Published As
Publication number | Publication date |
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CN101119931B (zh) | 2011-12-14 |
JP4303724B2 (ja) | 2009-07-29 |
CA2597863A1 (en) | 2006-08-31 |
CN101119931A (zh) | 2008-02-06 |
US20100069555A1 (en) | 2010-03-18 |
JPWO2006090446A1 (ja) | 2008-07-17 |
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