WO2002077121A1

WO2002077121A1 - Flame retardant, method for preparation thereof and flame-retardant resin composition

Info

Publication number: WO2002077121A1
Application number: PCT/JP2002/002557
Authority: WO
Inventors: Kazumasa Kanemoto
Original assignee: Kyowa Chemical Industry Co., Ltd.
Priority date: 2001-03-27
Filing date: 2002-03-18
Publication date: 2002-10-03
Also published as: JP2002285162A; JP3803557B2

Abstract

A flame retardant, characterized in that it is obtainable by the surface treatment of magnesium hydroxide particles coated with water glass, with a silicone compound having a SiH group in the molecular structure thereof; and a flame-retardant resin composition comprising the flame retardant. The flame retardant exhibits excellent flame-retardant effect with a less content in a resin, compared to a conventional magnesium hydroxide flame retardant.

Description

Description Flame retardant, method for producing the same and flame retardant resin composition Detailed description of the invention

Technical field to which the invention belongs

The present invention relates to a flame retardant used for the purpose of flame retarding by mixing it with a shelf, and a flame retardant resin composition obtained by blending the flame retardant with a resin. More specifically, protect the polymer materials used in the housing of home appliances, electric wires, cables, automobile vehicles, ships, aircraft, railway vehicles, building materials, electronic devices, printed circuit boards, etc. from disasters caused by heat such as fire. The present invention relates to a flame retardant and a flame-retardant resin composition used for the purpose of carrying out.

Conventional technology

Heretofore, as a flame retardant used for the purpose of rendering the shelf flame-retardant by mixing with a resin, a halogen compound, an antimony trioxide, a phosphorus compound, a hydrated metal compound and the like have been used. In recent years, a technique for improving the flame retardancy of a flame retardant using a silicone compound as a surface treatment agent has been proposed. For example, JP-A-58-185645 discloses antimony trioxide by an alkoxysilane surface treatment, and JP-A-58-179269 discloses an antimony compound obtained by a polysiloxane surface treatment. In Japanese Patent Application Laid-Open No. 58-63747, aluminum hydroxide particles obtained by surface treatment with methylhydrdiene polysiloxane, and in Japanese Patent Application Laid-Open No. 5-295266, an organosiloxane surface treatment is used. Disclosed are magnesium hydroxide particles and the like. Halogen compounds and antimony trioxide are being shunned from environmental issues such as dioxin. On the other hand, it is considered that phosphorus-based compounds have a high cost unit price. At present, hydrated metal compounds with reduced polymer properties and expensive phosphorus compounds are used.

Problems to be solved by the invention

The hydrated metal compound used as a flame retardant requires a larger amount to achieve the same flame retardancy as other organic flame retardant compounds. Therefore, the physical properties of the polymer are significantly reduced. Further, a polymer-flame-retardant composition blended with a hydrated metal compound as a flame retardant and a silicone compound as a flame-retardant aid is known to slightly improve the flame-retardant properties. It is still necessary to use a large amount of the compound in order to obtain the same flame retardance as that of the system-based flame retardant compound, and it is difficult to reduce the compounding amount. The problems described above have not been solved when any of them is used as a flame retardant. An object of the present invention is to mainly reduce the amount of a hydrated metal compound in order to prevent this.

Means for solving the problem

The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, obtained magnesium hydroxide particles further coated with a silicone compound having a SiH group in the molecular structure on magnesium hydroxide particles coated with water glass. When blended in a polymer, they found that good flame retardancy was possible even with low filling compared to a flame retardant not subjected to the surface treatment, and completed the present invention.

That is, according to the present invention, there is provided a flame retardant characterized in that magnesium hydroxide particles coated with water glass are surface-treated with a silicone compound having a SiH group in a molecular structure.

Further, according to the present invention, there is provided a flame-retardant resin composition comprising a flame retardant of the present invention in which two coating layers, a water glass layer and a silicone layer, are formed on the surface of the above-mentioned magnesium hydroxide particles. Provided.

Hereinafter, the flame retardant of the present invention, its production method and the flame-retardant resin composition will be described more specifically.

The magnesium hydroxide particles in the present invention are not limited as long as they are used as a flame retardant for a resin. It can be either synthetic or natural. The magnesium hydroxide particles are preferably those in which crystals have grown well, and those with little aggregation. The average particle size of the magnesium hydroxide particles, 2 0 m or less, preferably 0. 5 to 5 m is suitable, 8 £ Ding specific surface area of 2 0 111 ² 8 or less, preferably 2 to 1 0 m ² / g is appropriate.

Water glass coated on the surface of magnesium hydroxide particles is No. 1, 2 or 3 In addition to water glass, amorphous silica dissolved in Na〇H is used. In treating the surface of the magnesium hydroxide particles with water glass, the solvent used is preferably water or an alcohol-based solvent alone or as a mixed solvent. The amount of the coated water glass per 100 parts by weight of magnesium hydroxide is suitably 0.1 to 10 parts by weight, preferably 0.1 to 5 to 7 parts by weight.

The magnesium hydroxide particles surface-treated with water glass are further coated on the surface with a silicon compound.

Examples of the silicon compound used in the present invention include a polyorganosiloxane having a basic structure represented by the following general formula (1) and having a SiH group in the molecular structure.

R (1)

In the general formula (1), R is the same or different from each other; a saturated or unsaturated monovalent hydrocarbon group; R 'and R "are the same or different; a hydrogen atom, a saturated or unsaturated monovalent hydrocarbon; The group, n or m each represents an integer of 0 to 100,000, and each is preferably an integer of 0 to 50,000.S 11 equivalents are preferably in the range of 40 to 100, and 40 to 5 The value of R is more preferably in the range of 100 and most preferably in the range of 40 to 100. Preferred R is a saturated or unsaturated monovalent carbon atom having 1 to 10 carbon atoms such as a methyl group, an ethyl group or a phenyl group. Hydrocarbon group. Preferred R and R "include the same group as R, or a saturated or unsaturated monovalent hydrocarbon group having 1 to 10 carbon atoms selected from the group including a hydrogen atom.

The silicone compound having a SiH group in the molecular structure used in the present invention includes a reactive silicone, a crosslinking agent for silicone rubber, and the like. For example, Toray * Dow Corning 'Silicone, Shin-Etsu Chemical, Toshiba Silicon, Pecker-Chemie, Peyer and Rhone-Poulin Co., Ltd. And silicone oil for water repellent treatment.

The coating amount of the silicone compound is 100 parts by weight of the magnesium hydroxide particles. 0.1 to 50 parts by weight, preferably 0.5 to 20 parts by weight, is suitable.

When the OH group on the surface of water glass and the SiH group of the silicone compound are further reacted after the surface treatment of the magnesium hydroxide particles used in the present invention with water glass, a catalyst may be used if necessary. preferable. Such catalysts include tin catalysts such as dibutyltin dilaurate and dibutyltin diacetate; titanium catalysts such as tetrabutyl titanate; iron catalysts such as iron octoate; platinum catalysts such as chloroplatinic acid; And molybdenum-based catalysts. Particularly preferred among these are tin catalysts.

The catalyst is preferably added in an amount of 0.1 to 30 parts by weight, more preferably 5 to 10 parts by weight, based on 100 parts by weight of the silicone compound having a SiH group in the molecular structure. Use parts by weight.

The method for coating the magnesium hydroxide particles coated with water glass used in the present invention with a silicone compound having a SiH bond in the molecular structure includes, for example, a wet treatment in an organic solvent followed by drying or Spraying or spray-drying a silicone compound. The coating temperature is preferably 0 to 100 ° C., more preferably room temperature to 60, and particularly preferably room temperature. .

The reaction atmosphere for coating the magnesium hydroxide particles coated with water glass used in the present invention with a silicone compound having a SiH bond in the molecular structure can be either air or an inert gas atmosphere. Good, but desirably under an inert gas atmosphere.

In the above exemplified coating method, the organic solvent used when the magnesium hydroxide particles used in the present invention are surface-treated with water glass and then surface-treated with a silicon compound having a SiH group in the molecular structure. Examples thereof include alcohol compounds such as methanol, ethanol, cyclohexanol, n-butanol, n-hexanol, isopropyl alcohol, n-amyl alcohol, and ethylene glycol; tetrahydrofuran, getyl ether Amide compounds such as ethylformamide, dimethylformamide, and glycerolformamide; benzene, toluene, xylene, ethylbenzene, aniline, pyridine, benzol Aromatic compounds such as nitrile; ketone compounds such as acetone, methyl ethyl ketone, getyl ketone, methyl ethyl ketone, methyl propyl ketone, methyl isopropyl pyr ketone; ethyl acetate, butyl acetate, isoptyl acetate, acetic acid Ester compounds such as isopropyl; hydrocarbon compounds such as n-octane, n-heptane, and cyclohexane; amine compounds such as methylamine and getylamine; carbon tetrachloride, carbon form, isobutyl chloride, trichloroethylene, methyl chloride Examples include halogen-based organic compounds such as styrene, and nitromethane, acrylic acid, acetonitrile, dimethyl sulfoxide, and the like. The organic solvents exemplified above are used alone or as a mixed solvent of two or more kinds.

After the magnesium hydroxide particles used in the present invention are surface-treated with water glass, and further subjected to a surface treatment with a silicone compound having a SiH group in the molecular structure, the heat treatment temperature is 0 to 200 ° C. It is preferably from 80 to 120 ° C, particularly preferably from 100 to 120 ° C.

After the magnesium hydroxide particles used in the present invention are surface-treated with water glass and then surface-treated with a silicone compound having a SiH group in the molecular structure, the heat treatment atmosphere is air or inert gas. either will do.

The magnesium hydroxide particles coated with the water glass layer and the silicone compound layer described above are excellent as flame retardants for resins.

The resin of the flame-retardant resin composition of the present invention is any moldable thermoplastic resin or thermosetting resin. Examples of such resins include polyethylene, polypropylene, polybutene-11, poly4-methylpentene, ethylene-propylene copolymer, ethylene-butene-11 copolymer, ethylene-4-methylpentene copolymer, propylene-butene Olefin-based polymers or copolymers such as 11-copolymer, propylene-14-methylpentene copolymer, ethylene-acrylic acid ester copolymer, ethylene-monoacetate biel copolymer; polystyrene; Styrene-based polymers or copolymers such as acrylonitrile lube styrene-styrene copolymer, acrylonitrile-styrene copolymer, acrylonitrile-styrene-acrylic acid ester copolymer; vinyl chloride resin, vinyl acetate resin, chloride Vinylidene resin, ethylene monosalt Vinyl polymers or copolymers such as vinyl chloride copolymers; phenoxy resin, butyl resin, fluororesin, polyacetal resin, polyamide resin, polyurethane resin, polyester resin, polycarbonate resin J3, polyketone B , Methacrylic resin, diaryl phthalate resin, phenolic resin, epoxy resin, melamine resin, urea resin; others, ethylene-propylene-gen copolymer, butane rubber, styrene-butadiene rubber, chloroprene rubber, chlorine Rubbers such as fluorinated polyethylene, chlorosulfonated polyethylene, nitrile rubber, isoprene rubber, butyl rubber, and fluoro rubber.

Among these, preferred are olefin-based polymers or copolymers such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer and ethylene-acrylate copolymer.

In the present invention, the blending ratio of the flame retardant blended with the resin is, for example, 0.1 to 200 parts by weight, preferably 30 to 150 parts by weight, per 100 parts by weight of the resin. More preferably, 50 to 120 parts by weight is most preferable. If the amount is less than 0.1 part by weight, the flame retardancy is inferior. If the amount exceeds 200 parts by weight, the mechanical properties deteriorate, which is not preferable.

The flame retardant resin composition of the present invention has an oxygen index defined by JISK 7201 of 25 or more, and achieves 26 or more and most preferably 27 or more under suitable conditions.

In the flame retardant resin composition of the present invention, the flame retardant of the present invention is blended in the resin. However, the flame-retardant resin composition of the present invention may further contain other flame-retardant substances, if necessary. For example, boric acid-containing compounds such as zinc borate hydrate, barium metaborate, and borax; ammonium phosphate, ammonium polyphosphate, melamine phosphate, red phosphorus, phosphate ester, tris (chloroethyl) Phosphate, Tris (monochloropropyl propyl) phosphate, Tris (dichrolic propyl) phosphate, triallyl phosphate, tris (3-hydroxypropyl) phosphate, tris (tribromophenyl) phosphate, tris3) Monopropyl propyl phosphate, tris (dibromophenyl) phosphate, Lis (tripromoneopentyl) phosphate, tetrakis (2-chloroethyl) ethylene diphosphate, dimethyl methyl phosphate, tris (2-chloroethyl) orthophosphate, aromatic condensed phosphate, halogen-containing condensate Organophosphates, Ethylene 'bis' tris (2-cyanoethyl) phosphonium-promide, Ammonium polyphosphate, i3-Chloroethyl acetic acid phosphate, Butyl pyrophosphate, Butyl acetic acid phosphate, Butoxy melamine phosphate Phosphorus-containing compounds such as salts, halogen-containing phossonates, and phenyl'phosphonic acid; ammonium-based flame-retardant compounds such as ammonium sulfate; iron oxide-based combustion catalysts such as fuecopene; Such as titanium oxide Tan-containing compounds, guanidine compounds such as guanidine sulfamate, and others, zirconium compounds, molybdenum compounds, tin compounds, carbonate compounds such as potassium carbonate, and hydroxides such as aluminum hydroxide and magnesium hydroxide Inorganic flame-retardant compounds such as Japanese metal and its modified products; Flame-retardant compounds containing nitrogen, such as cyanurate compounds having a triazine ring; chlorinated paraffin, perchlorocyclopenedecane, hexabromobenzene, dekabu mouth Modifeniroxyside, bis (triplomophenoxy) ethane, ethylenebis dibu-mouth monolpropanedicarboxyimide, ethylenebis-tetrabromophthalimide, dibromoethyl dibu-mocyclohexane, dibromoneopentyldaricol, 2,4 , 6— Promophenol, tribromophenylaryl ether, tetrabromo'bisphenol A derivative, tetrabromo'bisphenol S derivative, tetradecabromo.diphenoxybenzene, tris- (2,3-dibromopropyl-111) -isocyanurate, 2 , 2_bis (4-hydroxy-3,5-dibromophenyl;!) Propane, 2,2-bis (4-hydroxyethoxy-3,5-dibromophenyl) propane, poly (benzoyl bromobenzyl acrylate), Tribromostyrene, tribromophenylmaleinide, tripromoneopentyl alcohol, n-bromophenol, pen-bromotoluene, pentabromodiphenyloxy M, cyclohexide mouth cyclododecan, hexabromodiphenyl ether, octabolofenolenetel, octane dibromodiphenyl ether, octabromodiphenyloxide, dibromoneopentyldaricoltetracarbonate, bis

(Tribromophenyl) Flame-retardant compounds containing halogens, such as fumaramide, N-methylhexabrodiphenylamine, styrene bromide, and diarylchlorendate; chlorendic anhydride, phthalic anhydride, and bisphenol Examples include compounds containing A, glycidyl compounds such as glycidyl ether, polyhydric alcohols such as diethylene glycol and erythritol, and modified carpamide. These are used alone or in combination of two or more.

The flame-retardant resin composition of the present invention may contain other additives as necessary. For example, crosslinking agents, crosslinking accelerators, crosslinking accelerators, activators, crosslinking inhibitors, antioxidants, antioxidants, ozone deterioration inhibitors, ultraviolet absorbers, light stabilizers, tackifiers , Plasticizers, softeners, reinforcing agents, reinforcing agents, foaming agents, foaming aids, stabilizers, lubricants, release agents, antistatic agents, denaturing agents, coloring agents, coupling agents, preservatives, anti-capi agents, Modifiers, adhesives, fragrances, polymerization catalysts, polymerization initiators, polymerization inhibitors, polymerization inhibitors, polymerization regulators, polymerization initiators, crystal nucleating agents, compatibilizers, dispersants, defoamers, etc. No. These are used alone or in combination of two or more.

The flame-retardant resin composition of the present invention comprises a resin, a flame retardant and, if necessary, other components selected from the group of, for example, a roll, a bider, a Banbury mixer, an intermix, a single-screw extruder, and a twin-screw extruder. The flame-retardant resin composition is prepared by kneading with one or more kneaders, for example, a press molding machine, an injection molding machine, a mold molding machine, a blow molding machine, an extrusion molding machine, and a spinning machine. It can be molded by one or more molding machines selected from the group of molding machines.

INDUSTRIAL APPLICABILITY The flame-retardant resin composition of the present invention is used for plastic parts of machinery and equipment, plastic parts of buildings, and plastic parts of vehicles, which can be a heat source such as electricity, gas, petroleum, coal, and nuclear power. You. For example, air conditioners, radios, televisions, fans, dishwashers, microwave ovens, mixers, cookers, washing machines, sound equipment, video and other appliances, snap switches, cord wires, plugs Receptacles, printed circuit boards, cord sets, power cords, temperature display control panels, electronic components such as transformers, electric wires, connector products, power cables, wallpaper, walls, beams, floors, power materials and other building materials, Examples include vehicle materials such as seats, panels, floors, and insulating materials.

Example

Hereinafter, the present invention will be described specifically with reference to Examples. However, the present invention is not limited to the following examples.

Flame retardant synthesis examples 1-9

Synthesis Example 1 (Reference example)

100 g of magnesium hydroxide particles (Kisuma 5 manufactured by Kyowa Chemical Co., Ltd.) and 10 g of a silicone compound having a SiH bond in the molecular structure (DMS-H25 manufactured by Azmax: Table 1) were stirred at room temperature for 1 hour in 30 OmL of tetrahydrofuran. Then, tetrahydrofuran (THF) was removed by a single evaporator. Next, the material from which the solvent had been removed was heat-treated with a dryer at 12 to 12 hours to obtain a flame retardant.

Synthesis example 2

Water 90 OML magnesium hydroxide particles (manufactured by Kyowa Chemical Kisuma 5) 1 100 g was攪拌, water glass (Co. Tokuyama Ltd. Kei sodium # 31) with respect to the magnesium hydroxide particles member at S i0 ₂ terms g, and after stirring for 30 minutes, dehydrate and dry. 100 g of the obtained water-glass-treated magnesium hydroxide particles were mixed with 10 g of a silicone compound having a SiH bond (DMS-H25 manufactured by Azmax) and dibutyltin dilaurate lg in 300 mL of tetrahydrofuran at room temperature. After stirring for 1 hour, tetrahydrofuran (THF) was removed with a single evaporator. Next, the material from which the solvent had been removed was subjected to a heat treatment at 120 ° C. for 12 hours in a dryer to obtain a flame retardant of the present invention.

Synthesis example 3

A flame retardant of the present invention was obtained in the same manner as in Synthesis Example 2 except that dibutyltin dilaurate was not added.

Synthesis Examples 4 to 9 The flame retardant of the present invention was obtained in the same manner as in Synthesis Example 3 except that the silicone compound to be added was a compound shown in Table 1 below. Table 1 also shows the silicon compounds used in Synthesis Examples 1-3.

Types of silicone compounds with SiH bonds

The silicone conjugate having a SiH group in the molecular structure of the products obtained in Synthesis Examples 1 to 9 and the magnesium hydroxide particles treated with water glass were used for the magnesium hydroxide particles treated with water glass (K1). The amount of SiH bond and the amount of non-SiH chemical bond (unit: PPH) were examined. In a 30 ml beaker, 1 g of the prepared product and 10 g of THF are stirred at room temperature for 1 hour. The mixture is filtered through Millipore, and the filtrate is dried in a vacuum oven at 120 ° C for 3 hours. The weight of the filtrate is measured. Since the weight of the filtrate dried product is the amount of non-chemical bond, the value obtained by subtracting that value from the charged amount is used as the amount of chemical bond. The results are shown in Table 2 below.

Table 2

According to Table 2 above, Synthesis Example 1 in which a magnesium compound not having been treated with water glass was treated with a silicone compound having a SiH group in the molecular structure was treated with magnesium hydroxide particles treated with water glass in the molecular structure. Comparing Synthetic Examples 2 to 9 in which a silicone compound having a SiH group was treated, the particles of Synthetic Examples 2 to 9 had higher SiH chemical bond amounts than Synthetic Example 1. This is based on the reactivity of the H groups on the surface of the magnesium hydroxide particles with the SiH groups of the silicone compound, indicating that the OH groups on the waterglass-treated magnesium hydroxide particles and the SiH of the silicone compound were not. This is probably due to the high reactivity of the group.

Examples 1 to 8

A flame retardant resin composition was prepared by blending 100 parts by weight of a polyethylene resin with 100 parts by weight of the flame retardant prepared in Synthesis Examples 2 to 9 above, and a flame retardancy test was performed. Samples were prepared using a twin-screw kneader and a press molding machine, respectively, 15 O mmX 3 mmX 3 mm Was molded. Biaxial kneading conditions are as follows: material supply section 160 ° C, kneading section 190 ° C, discharge section 170 ° C, press molding 180 ° C X 10 minutes, water cooling 10 minutes, annealing, flame retardant Test specimens were prepared. The flame retardancy test method was measured according to JIS K 7201 for oxygen index measurement.

Comparative Example 1

A flame-retardant resin composition was prepared by blending 100 parts by weight of a polyethylene resin with 100 parts by weight of magnesium hydroxide particles treated with water glass. The sample was prepared into a 15 Omm X 3 mm X 3 mm test piece using a biaxial kneader and press molding machine. Biaxial kneading conditions are as follows: material supply section 160 ° C, kneading section 190 ° C, discharge section 170 ° C, press molding 180 ° C X 10 minutes, water cooling 10 minutes, annealing for flame retardancy test Test pieces were prepared. The flame retardancy test method was measured in accordance with the oxygen index measurement JIS K 7201.

Comparative Example 2

A flame-retardant resin composition was prepared by mixing 100 parts by weight of magnesium hydroxide treated with water glass, 10 parts by weight of a silicone compound (DMS-H25 manufactured by Azmax), and 100 parts by weight of polyethylene resin. Was done. The sample was prepared by using a twin-screw kneader and a press molding machine to form a test piece of 150111111 3111] 11 3111111. Biaxial kneading conditions were as follows: material supply section 160, kneading section 190, discharge section 170 ° C, press molding 180 ° C X 10 minutes, water cooling 10 minutes, annealing to prepare test specimen for flame retardancy test did. The flame retardancy test method was measured in accordance with the oxygen index measurement JIS K 7201.

The results of Examples 1 to 8 and Comparative Examples 1 and 2 are summarized in Table 3 below. Table 3

From the results in Table 3 above, the following (a) to (d) are understood.

(a) Magnesium hydroxide particles with only 100 parts by weight of polyethylene resin treated with water glass Comparative Example 1 with 100 parts by weight of polyethylene resin and magnesium hydroxide particles with only 100 parts by weight of polyethylene resin treated with water glass In Comparative Example 2 in which 100 parts by weight and a silicone compound having a SiH group in the molecular structure were separately kneaded to the magnesium hydroxide particles without a chemical bond, the oxygen index was slightly improved. The oxygen index of the resin is about 17).

(b) Examples in which a water-glass-treated magnesium hydroxide particle is coated with a silicone compound having a SiH group in the molecular structure:! to 8 show that the water-glass-treated magnesium hydroxide particle has an intramolecular structure. The oxygen index was uniformly higher than that of Comparative Example 2 in which no silicone compound having a SiH group was bonded. .

(c) Next, a comparison of Example 1 in which dibutyltin dilaurate was added as a catalyst for accelerating the reaction between the OH group of water glass and the SiH group of the silicone compound and Example 2 in which dibutyltin dilaurate was not added was compared. Oxygen index of Example 1 with added rate Was high.

(d) In Examples 1 to 8, in which a substance having a different molecular structure of a silicone compound having a SiH group in the molecular structure was chemically bonded to magnesium hydroxide particles treated with water glass, in particular, Si was included in the molecular structure. Example 6 having a SiH equivalent of 65 in the silicon compound having an H group showed a high oxygen index. It was an unexpected result that the flame retardant properties of the flame retardant resin composition containing the water glass-treated magnesium hydroxide particles bonded with the silicone compound having a low SiH equivalent were very good.

The invention's effect

According to the present invention, the flame retardant of the present invention in which a silicone compound having a SiH group in its molecular structure is coated on water-glass-treated magnesium hydroxide particles and chemically bonded thereto has the following excellent effects. can get.

(1) The flame retardant of the present invention, which is obtained by coating a silicone compound having a SiH group in its molecular structure with water-glass-treated magnesium hydroxide particles and chemically bonding the same, comprises magnesium hydroxide particles that are not treated with water glass. The figure shows a higher chemical bond amount than that obtained by treating a silicone compound having a SiH group in the molecular structure.

(2) The flame retardant of the present invention in which a silicone compound having a SiH group in the molecular structure is chemically bonded to magnesium hydroxide particles treated with water glass is compared with a flame retardant not having the chemical bonding property. High flame retardancy.

(3) The flame retardant of the present invention in which a silicone compound having a SiH group in the molecular structure and having a low SiH equivalent is chemically bonded to magnesium hydroxide particles treated with water glass has particularly high flame retardancy. Show.

(4) The flame retardant of the present invention, in which a silicone compound having a SiH group in the molecular structure is chemically bonded to magnesium hydroxide particles treated with waterglass, comprises an OH group of waterglass and a silicon compound of silicon compound. Higher flame retardancy is exhibited by adding a catalyst that promotes the reaction of the H group.

Claims

The scope of the claims

1. A flame retardant characterized in that magnesium hydroxide particles coated with water glass are surface-treated with a silicone compound having a SiH group in the molecular structure.

2. The flame retardant according to claim 1, wherein the silicone compound having a SiH group in the molecular structure is a polyorganosiloxane represented by the following general formula (1) and containing a SiH group at a terminal or between molecules. .

R

R "~ Si— 0 '(1)

R

(Wherein, R represents a saturated or unsaturated monovalent hydrocarbon group, and R 'and R "are the same or different and represent a hydrogen atom, a saturated or unsaturated monovalent hydrocarbon group. , N and m each represent an integer from 0 to 100,000)

3. The flame retardant according to claim 1, wherein the coating amount of the water glass is 0.1 to 10 parts by weight based on 100 parts by weight of the magnesium hydroxide particles.

4. The silicone compound having a SiH group in the molecular structure is a polyorganosiloxane containing a SiH group at a terminal or between molecules and having an S1 ^ 1 equivalent of 40 to 1,

2. The flame retardant according to claim 1, which is 000.

5. The flame retardant according to claim 1, wherein the coating amount of the silicone compound having a SiH group in the molecular structure is 0.1 to 50 parts by weight based on 100 parts by weight of the magnesium hydroxide particles.

6. When the magnesium hydroxide particles coated with water glass with a silicone compound having a SiH group in the molecular structure are further coated, 2. The flame retardant according to claim 1, wherein the catalyst promotes the reaction of the SiH group of the compound.

7. When coating magnesium hydroxide particles coated with water glass with a silicone compound having a SiH group in the molecular structure, they are wet-treated in an organic solvent and then dried or spray-dried. Method for producing a flame retardant.

8. A flame-retardant resin composition comprising the flame retardant according to claim 1 blended in a resin.

9. The flame-retardant resin composition according to claim 8, comprising 0.1 to 200 parts by weight per 100 parts by weight of the flame retardant according to claim 1.

10. The flame-retardant resin composition according to claim 8, wherein the resin is an olefin-based polymer or copolymer.

9. The flame-retardant resin composition according to claim 8, wherein the oxygen index defined by 111. JIS 7201 is 25 or more.

1 2. A molded article formed from the resin composition according to claim 8.