JPH05112669A - Flame retardant, its production and flame-retardant resin composition incorporated with the same - Google Patents

Abstract

PURPOSE:To obtain a flame retardant for synthetic resins, etc., capable of providing such resins with flame retardancy at its low levels of formulation by reaction in an aqueous medium among halide(s) of divalent metal element(s) such as Mg, Co, Cu, Zn and Fe, etc., an inorganic or organic acid and an alkaline compound followed by aging. CONSTITUTION:Reaction is made in an aqueous medium among (A) halide(s) of at least one kind of divalent metal element selected from Mg, Co, Cu, Zn and Fe, etc. (e.g. magnesium chloride), (B) an inorganic or organic acid (e.g. stearic acid) and (C) an alkaline compound (e.g. calcium hydroxide), and the reaction product is aged at 100-250 deg.C, thus obtaining the objective flame retardant consisting of a hydrated metal oxide solid solution of the formula [M is divalent metal element such as Co, Cu, Zn, Fe, etc.; x and y satisfy the relationships: 0<=x<=0.3, 0<=y<=0.2 (where they are not zero at the same time)]. The other objective flame-retardant resin composition can be obtained by incorporating 100 pts.wt. of a synthetic resin with 10-250 pts.wt. of this flame retardant.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a flame retardant, a method for producing the same, and a flame retardant resin composition. More specifically, it relates to a flame retardant capable of providing a flame retardant resin composition having excellent mechanical strength, water resistance and acid resistance, a method for producing the same, and a flame retardant resin composition.

[0002]

2. Description of the Related Art As a method of making a synthetic resin flame-retardant, a technique of adding an organic halogen compound or antimony trioxide to a synthetic resin has been conventionally used. But this technology
When a fire occurs, a large amount of smoke is generated, and a toxic and corrosive gas is generated, which causes problems such as human injury and stopping the functions of peripheral devices. Therefore, a non-toxic inorganic hydroxide containing no halogen has attracted attention, and a technique of adding aluminum hydroxide to a synthetic resin has been proposed. However, this technique has a problem of foaming due to decomposition of aluminum hydroxide during resin molding.

As a solution to the above problems, BET
There has been proposed a technique of adding a flame retardant obtained by surface-treating magnesium hydroxide having a specific surface area of 20 m ² / g or less and hardly coagulating with a higher fatty acid or the like. This technology is widely used as a communication cable, a power cable, a housing for electric appliances, and the like.

[0004]

In the case of a technique using a flame retardant obtained by surface-treating magnesium hydroxide with a higher fatty acid or the like, in order to impart the required flame retardancy, the blending amount of the flame retardant with respect to the synthetic resin is required. Must be increased. Therefore, the excellent mechanical strength characteristics originally possessed by the synthetic resin are deteriorated, and the water resistance and acid resistance are also unsatisfactory.

[0005]

The present invention provides the formula (1) Mg _1-xy Ni _x M _y (OH) ₂ (1) [wherein M is a divalent metal element of Co, Cu, Zn or Fe, x and y represent 0 ≦ x ≦ 0.3 and 0 ≦ y ≦ 0.2 (where x and y are not 0 at the same time), and a flame retardant which is a hydrated metal oxide solid solution. Further, the present invention provides a method for producing the flame retardant and a flame retardant resin composition containing the flame retardant in a predetermined amount.

The hydrated metal oxide solid solution of the present invention exhibits excellent flame retardancy. The reason for this is not clear, but it is presumed that the carbonization promoting catalyst effect is greater than that of the magnesium hydroxide alone composition during combustion. For this reason, the flame retardant effect of synthetic resin can be achieved with a smaller amount than magnesium hydroxide,
This improves the mechanical properties, water resistance, acid resistance and molding appearance of the resin composition.

In the hydrated metal oxide solid solution of the present invention, a part of magnesium having a magnesium hydroxide structure is converted into Ni and C.
It is substituted with a divalent metal element such as o, Cu, Zn or Fe. Nickel hydroxide and cobalt hydroxide belong to the same cadmium iodide structure as magnesium hydroxide,
Further, since the sizes of the ionic radii are the same or very close to each other, the substitution solid solutions are formed without any limitation. The divalent metal elements of copper, zinc and iron are limited to solid solution in magnesium hydroxide.

In consideration of the fact that the structural water desorption temperature of the solid solution moves to a lower temperature side as the solid solution amount increases, the specific gravity of the solid solution increases, and the economy is considered, the divalent metal element in the formula (1) is used. X and y, which represent the amount of solid solution, are each 0.
3 or less, 0.2 or less, and preferably 0.05 or less.

Manufacture of flame retardants which are solid solutions of hydrated metal oxides is made of magnesium and Co, Cu, Zn and Fe.
It is achieved by reacting at least one divalent metal element halide or inorganic acid or organic acid selected from the above with an alkaline substance in an aqueous medium, and aging the reaction product at 100 to 250 ° C. Examples of the alkaline substance include calcium hydroxide, ammonia, sodium hydroxide, potassium hydroxide and the like.

The flame retardant obtained can be blended with the synthetic resin as it is. Further, in order to improve the compatibility with the synthetic resin and to improve the mechanical properties, water resistance, acid resistance and the like, the surface treatment may be performed with a higher fatty acid or the like, and then the synthetic resin may be blended. The surface treatment agent is preferably used in an amount of about 0.1 to 10 parts by weight per 100 parts by weight of the flame retardant.

Examples of preferable surface treatment agents are as follows. Higher fatty acids such as oleic acid and stearic acid or alkali metal salts thereof, vinyl ethoxysilane, vinyl tris (2-methoxy) silane, gamma methacryloxypropyltrimethoxysilane, gamma aminopropyltrimethoxysilane, beta (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, gamma-glykydoxy-propyltrimethoxysilane, gamma-mercapdopropyltrimethoxysilane and other silane coupling agents, isopropyltriisostearoyl titanate, isopropyltris (dioctyl pyrophosphate) Titanate coupling agents such as titanate, isopropyltri (N-aminoethylaminoethyl) titanate, isopropyltridecylbenzenesulfonyl titanate, acetanate Aluminum-based coupling agents such as alkoxyaluminum diisopropionate, mono- or diesters of orthophosphoric acid with stearyl alcohol, palmityl alcohol, aralkyl alcohol, etc., which are dialcohol amine salts or phosphorus such as alkali metals. Acid partial esters, etc.

In the hydrated metal oxide solid solution of the present invention, it is preferable that the crystals grow well and the agglomeration is small in order to exhibit good moldability, mechanical strength and flame retardancy. That is, the BET specific surface area is in the range of ¹ to 30 m ² / g, particularly preferably 1 to 10 m ² / g, and the average of 2
The secondary particle size is 0.2 to 5 μm, particularly preferably 0.5 to 3 μm.
It is preferably in the range of m. If the BET specific surface area exceeds the above range, the moldability, mechanical strength, water resistance, acid resistance, etc. of the resin will decrease, and if it is less than the above range, flame retardancy, tensile strength, etc. will decrease. If the average secondary particle diameter is smaller than the above range, the resin moldability, mechanical strength, water resistance, acid resistance, etc. are lowered, and if it exceeds the above range, flame retardancy, tensile strength, etc. are lowered.

Examples of the resin used in the flame-retardant resin composition of the present invention include the following resins. In the present invention, the term resin means synthetic resin or synthetic rubber. Polyethylene, polypropylene, polybutene-1, poly-4-methylpentene-1, ethylene / propylene copolymer, ethylene / butene-1 copolymer, ethylene / 4-methylpentene-1 copolymer, propylene /
Butene-1 copolymer, propylene / 4-methylpentene-1 copolymer, ethylene / propylene / diene-copolymer, post-chlorinated resins thereof, polystyrene, ABS,
Styrene polymers or copolymers such as AAS, AES, AS, vinyl chloride resin, vinyl acetate resin, vinylidene chloride resin, ethylene / vinyl chloride copolymer, ethylene / vinyl acetate copolymer, vinyl chloride or acetic acid Vinyl-based polymers or copolymers, ethylene / ethyl acrylate copolymer, phenoxy resin, butadiene resin, fluororesin, polyacetal resin, polyamide resin, polyamideimide resin, polyarylate resin, polyurethane resin, polyethylene terephthalate, polybutylene Thermoplastic resins such as polyester resins such as terephthalate, polycarbonate resins, polysulfone resins, polyphenylene oxide resins, methacrylic resins, and further diallyl phthalate resins, vinyl ester resins, phenol resins, unsaturated polyesters. Resins, melamine resins, urea resins, epoxy resins, thermosetting resins such as alkyd resins, and ethylene propylene diene rubber, (hereinafter referred to as EPDM), SBR, NBR, butyl rubber, IR, EPM,
Synthetic rubber such as urethane rubber, acrylic rubber, chloroprene rubber, and chlorosulfonated polyethylene rubber.

The flame-retardant resin composition of the present invention is the resin 1
About 10 to 250 parts by weight of a hydrated metal oxide solid solution surface-treated with a surface treatment agent is contained with respect to 00 parts by weight.

The flame-retardant resin composition of the present invention may contain other conventional additives in addition to the above components. Examples of such additives include antioxidants, ultraviolet absorbers, antistatic agents, lubricants, pigments, foaming agents, plasticizers, fillers, reinforcing agents, organic halogen flame retardants, carbon black, tin and tin compounds. Examples include flame retardant aids such as red phosphorus and crosslinking agents.

The flame-retardant resin composition of the present invention can be produced by an ordinary kneading method using a roll, a Banbury mixer, a kneader, a single screw extruder, a twin screw extruder or the like.

The method for measuring the BET specific surface area and the like is as follows.

BET specific surface area: measured by adsorption of nitrogen at liquid nitrogen temperature, average secondary particle diameter: 1% aqueous magnesium hydroxide slurry was ultrasonically dispersed for 3 minutes, and then Microtrac (Nikkiso Co., Ltd. Acid resistance: two test pieces of 127 × 13 × 3.2 mm were immersed in 500 ml of deionized water, and then carbon dioxide gas was continuously blown at 24 ° C. for 48 hours and then water. Quantitative analysis was performed on the magnesium ions eluted in by the atomic absorption method. Water resistance: Six test pieces of 100 × 100 × 2.08 mm were immersed in 1 liter of deionized water and left at 95 ° C. for 1 day. Immersion in 1 liter of deionized water at 30 ° C. for 15 minutes. The test piece was taken out, the water on the surface was wiped off, and then the test piece was left in a room at a temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 5% for 15 minutes. Then JIS K in the same room
Volume resistivity was measured according to 6911.

Tensile strength and bending strength: JIS K71
Izod impact strength with notch: measured according to JIS K7110 Flame retardancy: 1/8 inch thick test piece UL
It measured according to the 94 method.

The present invention will be described in more detail based on the following examples. In the examples,% and parts mean% by weight and parts by weight, respectively, unless otherwise specified.

Example 1 203 g of nickel chloride · 6H ₂ O was added and dissolved in 10 liters of a 1.8 mol / liter magnesium chloride aqueous solution. While stirring at room temperature (about 20 ° C.), 5.17 liters of 3.3 mol / liter calcium hydroxide solution was added and reacted. After stirring at room temperature for 2 hours, the reaction solution was put into an autoclave having a volume of about 40 liters and subjected to hydrothermal treatment at 170 ° C. for 2 hours.

After washing and filtering the product, 10 liters of a slurry in which the cake was dispersed in water and 34 parts of sodium stearate were added.
5 liter of an aqueous solution containing g was mixed and stirred at 80 ° C. for 1 hour. The stirring liquid is filtered, and the resulting cake is heated to 110 ° C.
And dried with hot air for 24 hours. The obtained flame retardant was a hydrated metal oxide having a composition represented by Mg _0.95 Ni _0.5 (OH) ₂ containing 3.1% of stearic acid from powder X-ray diffraction and chemical analysis results.

Chemical analysis value: MgO; 63.72%, Ni
O; 6.21%, Cl; 0.04%, stearic acid; 3.
1%, ablation loss: 29.9%, BET specific surface area; 6.0 m
² / g, average secondary particle diameter; 0.9 μm, specific gravity; 2.44.

Impact-resistant polypropylene and the above-mentioned hydrated metal oxide were premixed in the compounding ratios shown in Table 1, and then melt-kneaded at about 230 ° C. using a twin-screw extruder. A test piece was prepared from the obtained kneaded product using an injection molding machine at about 230 ° C. Table 1 for the obtained test pieces
The properties shown in were tested.

Example 2 1.73 mol / liter magnesium chloride aqueous solution 15
To the liter, 56 g of nickel chloride · 6H ₂ O was added and dissolved. While stirring at room temperature (about 25 ° C.), 10.5 liters of a 2.2 mol / liter calcium hydroxide solution was added and reacted. After stirring at room temperature for 1 hour, the reaction solution was put into an autoclave having a volume of about 40 liters and hydrothermally treated at 170 ° C. for 2 hours.

After washing and filtering the product, 10 liters of a slurry prepared by dispersing the cake in water and 5 liters of an aqueous solution containing 45 g of sodium salt of distearyl alcohol phosphate were mixed and stirred at 80 ° C. for 1 hour. The stirred liquid was filtered, and the obtained cake was dried with hot air at 110 ° C. for 24 hours. The obtained flame retardant was Mg _0.99 Ni containing 3.0% of stearic acid from the results of powder X-ray diffraction and chemical analysis.
It was a hydrated metal oxide having a composition represented by _0.01 (OH) ₂ .

Chemical analysis value: MgO; 67.30%, Ni
O; 1.29%, Cl; 0.03%, ether extraction of surface treatment agent; 2.5%, thermal ablation: 31.3%, BET specific surface area; 5.7 m ² / g, average secondary Particle size: 0.9 μm.

Impact-grade polypropylene and the above-mentioned hydrated metal oxide were premixed in the compounding ratio shown in Table 1, and then melt-kneaded at about 230 ° C. using a twin-screw extruder. A test piece was prepared from the obtained kneaded product using an injection molding machine at about 230 ° C. Table 1 for the obtained test pieces
The properties shown in were tested.

Example 3 Magnesium chloride aqueous solution of 1.36 mol / liter 10
To liter, 584 g of nickel chloride · 6H ₂ O was added and dissolved. While stirring at room temperature (about 20 ° C.), 4.68 liter of a calcium hydroxide solution of 3.15 mol / liter was added and reacted. After stirring at room temperature for 1 hour, the reaction solution was put into an autoclave having a volume of about 40 liters and hydrothermally treated at 170 ° C. for 2 hours.

After washing and filtering the product, 10 liters of a slurry prepared by dispersing the filtered cake with water and 5 liters of an aqueous solution containing 33 g of sodium stearate are mixed and the mixture is heated to 80 ° C.
It was stirred for 1 hour. The stirred liquid was filtered, and the obtained cake was dried with hot air at 110 ° C. for 24 hours. The obtained flame retardant is
Stearic acid from powder X-ray diffraction and chemical analysis results 3.
It was a hydrated metal oxide having a composition represented by Mg _0.83 Ni _0.17 (OH) ₂ containing 2%.

Chemical analysis value: MgO; 51.93%, Ni
O; 19.50%, Cl; 0.08%, stearic acid;
3.2%, ablation loss; 28.5%, BET specific surface area; 9.
0 m ² / g, average secondary particle size; 0.72 μm, specific gravity; 2.
62.

Impact-grade polypropylene and the above-mentioned hydrated metal oxide were premixed at the compounding parts shown in Table 1, and then melt-kneaded at about 230 ° C. using a twin-screw extruder. A test piece was prepared from the obtained kneaded product using an injection molding machine at about 230 ° C. Table 1 for the obtained test pieces
The properties shown in were tested.

EXAMPLE 4 1.36 mol / liter magnesium chloride aqueous solution 15
To liter, 219 g of cobalt chloride.6H ₂ O was added and dissolved. 3.15 mol / g with stirring at room temperature (about 25 ° C)
6.15 liters of calcium hydroxide solution was added and reacted. After stirring at room temperature for 1 hour, the reaction solution was put into an autoclave with a volume of about 40 liters, and heated at 170 ° C for 4 hours.
It was hydrothermally treated for an hour.

After washing and filtering the product, 10 liters of the slurry obtained by dispersing the filtered cake with water and 5 liters of an aqueous solution containing 44 g of sodium stearate are mixed and the mixture is heated to 80 ° C.
It was stirred for 1 hour. The stirred liquid was filtered, and the obtained cake was dried with hot air at 110 ° C. for 24 hours. The obtained flame retardant is
Stearic acid from powder X-ray diffraction and chemical analysis results 3.
It was a hydrated metal oxide having a composition represented by Mg _0.949 Co _0.051 (OH) ₂ containing 5%.

Chemical analysis value: MgO; 62.7%, Co
O; 6.27%, Cl; 0.04%, stearic acid; 3.
5%, ablation loss; 30.2%, BET specific surface area; 18.0
m ² / g, average secondary particle diameter; 0.55 μm.

The impact-grade polypropylene and the above-mentioned hydrated metal oxide were premixed in the compounding ratios shown in Table 1, and then melt-kneaded at about 230 ° C. using a twin-screw extruder. A test piece was prepared from the obtained kneaded product using an injection molding machine at about 230 ° C. Table 1 for the obtained test pieces
The properties shown in were tested.

Example 5 Magnesium chloride aqueous solution of 1.73 mol / liter 10
To a liter, 37.4 g of nickel chloride.6H ₂ O and 21.5 g of zinc chloride were added and dissolved. While stirring at room temperature (about 20 ° C.), 7.22 liters of a 2.2 mol / liter calcium hydroxide solution was added and reacted. After stirring at room temperature for 1 hour, the reaction solution was put into an autoclave having a volume of about 40 liters and hydrothermally treated at 170 ° C. for 2 hours.

After washing and filtering the product, 10 liters of a slurry in which the filtered cake was dispersed in water and 5 liters of an aqueous solution containing 30 g of sodium stearate were mixed, and the mixture was heated to 80 ° C.
It was stirred for 1 hour. The stirred liquid was filtered, and the obtained cake was dried with hot air at 110 ° C. for 24 hours. The obtained flame retardant is
Stearic acid from powder X-ray diffraction and chemical analysis results 3.
It was a hydrated metal oxide having a composition represented by Mg _0.98 Ni _0.01 Zn _0.01 (OH) ₂ containing 0%.

Chemical analysis value: MgO; 66.9%, Ni
O; 1.27%, ZnO; 1.38%, Cl; 0.05
%, Stearic acid; 3.0%, heat loss: 30.3%, B
ET specific surface area; 5.9 m ² / g, average secondary particle diameter; 0.9
μm.

Impact-resistant polypropylene and the above-mentioned hydrated metal oxide were premixed in the compounding ratio shown in Table 1, and then melt-kneaded at about 230 ° C. using a twin-screw extruder. A test piece was prepared from the obtained kneaded product using an injection molding machine at about 230 ° C. Table 1 for the obtained test pieces
The properties shown in were tested.

Example 6 10 aqueous solution of 1.73 mol / l magnesium chloride
13.1 g of cupric chloride · 2H ₂ O was added to 1 liter and dissolved. While stirring at room temperature (about 26 ° C.), 5.04 liters of a 3.05 mol / liter calcium hydroxide solution was added and reacted. After stirring at room temperature for 3 hours, the reaction solution was put into an autoclave having a volume of about 40 liters and hydrothermally treated at 170 ° C. for 2 hours.

After washing and filtering the product, 10 liters of a slurry prepared by dispersing the filtered cake with water and 5 liters of an aqueous solution containing 29 g of sodium stearate are mixed and the mixture is heated to 80 ° C.
It was stirred for 1 hour. The stirred liquid was filtered, and the obtained cake was dried with hot air at 110 ° C. for 24 hours. The obtained flame retardant is
Stearic acid from powder X-ray diffraction and chemical analysis results 3.
It was a hydrated metal oxide having a composition represented by Mg _0.995 Cu _0.005 (OH) ₂ containing 0%.

Chemical analysis value: MgO; 67.76%, Cu
O; 0.68%, Cl; 0.07%, stearic acid; 3.
0%, ablation loss; 31.5%, BET specific surface area; 8.7m
² / g, average secondary particle diameter; 0.57 μm.

Impact-resistant polypropylene and the above-mentioned hydrated metal oxide were premixed in the mixing parts shown in Table 1, and then melt-kneaded at about 230 ° C. using a twin-screw extruder. A test piece was prepared from the obtained kneaded product using an injection molding machine at about 230 ° C. Table 1 for the obtained test pieces
The properties shown in were tested.

Example 7 Magnesium chloride.6H ₂ O, nickel chloride 6H ₂ O and ferrous chloride were boiled in advance for about 30 minutes, and then dissolved in water saturated with nitrogen through high purity nitrogen gas to obtain Mg, respectively. 10 l of a solution containing ²⁺ = 1.73 mol / l, Ni ²⁺ = 25.4 mol / l and Fe ²⁺ = 6.4 mol / l were prepared. Separately, the same pretreatment was carried out to dissolve sodium hydroxide in water saturated with nitrogen to prepare 8 liters of a solution having sodium ions of 4 mol / liter.

While stirring 10 liters of a solution containing iron ions, etc., 8 liters of a solution of sodium hydroxide was poured into and reacted in a reaction vessel with air cut off. The obtained slurry was hydrothermally treated at 170 ° C. for 2 hours in a non-oxidizing atmosphere. Then, after dehydration washing in a non-oxidizing atmosphere, 10 liters of a slurry dispersed in water saturated with nitrogen, 30 g of sodium stearate and 5 liters of nitrogen saturated water were mixed in a non-oxidizing atmosphere and stirred at 80 ° C. for 1 hour. .. The obtained slurry was dehydrated in a non-oxidizing atmosphere and then vacuum dried.

The obtained flame retardant was Mg _0.98 N containing 3.0% of stearic acid from the results of powder X-ray diffraction and chemical analysis.
It was a hydrated metal oxide having a composition represented by i _0.016 Fe _0.004 (OH) ₂ .

Chemical analysis value: MgO; 66.9%, Ni
O; 2.02%, FeO 0.49%, Cl; 0.04%,
Stearic acid; 3.0%, BET specific surface area; 6.0 m ² /
g, average secondary particle diameter; 0.79 μm. Impact-resistant polypropylene and the above-mentioned hydrated metal oxide were premixed in the compounding ratios shown in Table 1, and then mixed with a twin-screw extruder to about 23
Melt kneading was carried out at 0 ° C. A test piece was prepared from the obtained kneaded product using an injection molding machine at about 230 ° C. The obtained test piece was tested for the characteristics shown in Table 1.

Comparative Example 1 A test piece of impact-resistant polypropylene was prepared at about 230 ° C. using an injection molding machine. The obtained test piece was tested for the characteristics shown in Table 1.

Comparative Examples 2 and 3 The same impact-grade polypropylene and magnesium hydroxide as in Comparative Example 1 (BET specific surface area 6.0 m ² / g, average particle size 0.8 μm, surface with 3.0% stearic acid). processing)
And (3) were mixed in advance with the compounding numbers shown in Table 1, and then melt-kneaded at about 230 ° C. using a twin-screw extruder. The obtained kneaded product was injection-molded by the same method as in Comparative Example 1. The obtained test piece was tested for the characteristics shown in Table 1.

Comparative Example 4 A high density polyethylene (hereinafter referred to as HDPE) having a density of 0.954 (g / cc) was molded at about 250 ° C. using an injection molding machine to prepare a test piece. The obtained test piece was tested for the characteristics shown in Table 1.

Comparative Example 5 The same HDPE as in Comparative Example 4 and the same magnesium hydroxide as in Comparative Example 2 were premixed in the compounding ratio shown in Table 1, and then melt-kneaded at about 250 ° C. using a twin-screw extruder. .. The kneaded material thus obtained was injection-molded in the same manner as in Comparative Example 4 to obtain a test piece. The obtained test piece was tested for the characteristics shown in Table 1.

Example 8 The same HDPE as in Comparative Example 4 and the hydrated metal oxide shown in Table 1 were melt-kneaded and injection-molded in the same manner as in Comparative Example 5 with the compounding parts shown in Table 1 to prepare a test piece. did. The obtained test piece was tested for the characteristics shown in Table 1.

Table 1 Synthetic resin Hydrated metal Blend part Flame retardance (A) Oxide (B) (A) (B) UL94VE 1/8 inch Comparative example 1 Polypropylene C 100 0 Nonstandard Comparative example 2 Polypropylene C 100 110 HB Comparative Example 3 Polypropylene C 100 150 V-0 Example 1 Polypropylene D 100 110 V-0 Example 2 Polypropylene E 100 110 V-0 Example 3 Polypropylene F 100 110 V-0 Example 4 Polypropylene G 100 110 V-0 Example 5 Polypropylene H 100 110 V-0 Example 6 Polypropylene I 100 110 V-0 Example 7 Polypropylene J 100 110 V-0 Comparative Example 4 HDPE C 100 0 Nonstandard Comparative Example 5 HDPE C 100 130 HB Example 8 HDPE E 100 130 V-1 Note C; Mg (OH)₂  D; Mg_0.95Ni_0.5(OH)₂  E; Mg_0.99Ni_0.01(OH)₂  F; Mg_0.83Ni_0.17(OH)₂  G; Mg_0.949Co_0.051(OH)₂  H; Mg_0.995Cu_0.005(OH)₂  I; Mg_0.98Ni_0.016Fe_0.004(OH)₂  Table 1 (continued) Tensile strength Bending strength Acid resistance Water resistance, volume resistivityYield point Maximum point Carbon dioxide resistance Before test After the test Comparative Example 1 300 430 0 1 × 10¹⁷ 3 x 10¹⁶  Comparative Example 2 220 423 3 1 × 10¹⁶ 4 x 10¹⁵  Comparative Example 3 192 369 6 1 × 10¹⁶ 1 x 10¹⁵  Example 1 221 425 2 2 × 10¹⁶ 5 x 10¹⁵  Example 2 225 429 1 2 × 10¹⁶ 5 x 10¹⁵  Example 3 233 439 1 2 × 10¹⁶ 5 x 10¹⁵  Example 4 230 436 2 1x10¹⁶ 5 x 10¹⁵  Example 5 229 430 22 x 10¹⁶ 5 x 10¹⁵  Example 6 218 421 2 1x10¹⁶ 5 x 10¹⁵  Example 7 215 423 22 x 10¹⁶ 5 x 10¹⁵  Comparative Example 4 270 260 0 1 × 10¹⁷ 3 x 10¹⁶  Comparative Example 5 195 308 4 1 × 10¹⁶ 3 x 10¹⁵  Example 8 196 310 3 1x10¹⁶ 4 x 10¹⁶ Note: Unit of tensile strength and bending strength kgf / cm², Acid resistance of magnesium oxide after soaking for 48 hours at 24 ℃
Elution amount (ppm), water resistance is 95 ° C, volume specific resistance (Ω ・
cm).

[0055]

According to the present invention, flame retardancy, mechanical properties,
Provided are a flame-retardant resin composition having excellent acid resistance and water resistance, and a flame retardant used for the flame-retardant resin composition.

Claims (4)

[Claims] 1. A formula _{(1) Mg 1-xy Ni} x M y (OH) 2 (1) [ divalent metal element M in the formula Co, Cu, Zn or Fe, x and y are 0 ≦ x ≦ 0.3, 0 ≦ y ≦ 0.2 (where x and y are not 0 at the same time)], which is a hydrated metal oxide solid solution flame retardant. 2. A flame retardant obtained by surface-treating the flame retardant according to claim 1 with a higher fatty acid salt or a phosphate ester salt. 3. The synthetic resin 100 containing the flame retardant according to claim 1.
A flame-retardant resin composition comprising 10 to 250 parts by weight based on parts by weight. 4. Magnesium, and Co, Cu, Zn
And a halide of at least one divalent metal element selected from Fe and Fe, an inorganic acid or an organic acid, and an alkaline substance are reacted in an aqueous medium, and the reaction product is added to 100 to 25
The method for producing a flame retardant according to claim 1, which comprises aging at 0 ° C.