JP2001031408A - Zinc magnesium ethylenediamine phosphate, its production and flame-retardant resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a flame retardant having high flame retardance by compounding zinc ethylenediamine phosphate with magnesium. SOLUTION: Zinc magnesium ethylenediamine phosphate is expressed by the formula [(a) is 0.01 to 0.8]. The compound is obtained by mixing an aqueous solution of ethylenediamine with the aqueous solution of zinc magnesium phosphate obtained by dissolving zinc and magnesium in phosphoric acid. Therein, the magnesium/zinc molar ratio, the phosphoric acid/(zinc + magnesium) molar ratio, and the ethylenediamine /(zinc + magnesium) are preferably 0.01 to 4, 1 to 2, and 0.5 to 1.0, respectively. The mixing time is preferably several minutes to several hours, and the mixing temperature is desirably 0 to 50 deg.C. The zinc magnesium ethylenediamine phosphate is crystallized at pH 3 to 8. After the pH is adjusted, the solution is stirred at 0 to 50 deg.C for 3 to 24 hours to age the crystals, which are washed, subjected to a solid liquid separation treatment, and then dried. The obtained flame retardant preferably in an amount of 150 to 300 pts.wt. is compounded with 100 pts.wt. of a resin to obtain the flame- retardant resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ethylenediamine zinc magnesium phosphate useful as a flame retardant for various electric appliances, automobile parts, building materials, electric wires, cables, etc., a method for producing the same, and a flame retardant resin obtained by blending the same. It relates to a composition.

[0002]

2. Description of the Related Art Conventionally, halogen-based flame retardants have been widely used for flame retardancy of resins because of their excellent flame retardancy, resin properties, and price. Due to problems such as the generation of toxic gases during combustion and the like, in recent years, the development of flame retardant formulations that do not use halogen-based compounds has been actively conducted.

Examples of flame retardants containing no halogen atom for the purpose of flame retardation of resins include phosphate compounds such as triphenyl phosphate and tricresyl phosphate (see Japanese Patent Publication No. 53-418), ethylenediamine phosphorus Amine phosphates such as acid salts (see JP-A-5-156116) and ammonium polyphosphate (JP-A-7-33)
No. 0968), phosphorus-based flame retardants such as red phosphorus, and inorganic flame retardants such as magnesium hydroxide, aluminum hydroxide and zinc borate.

[0004] However, many phosphate ester compounds have high volatility and insufficient heat resistance, and further improvement has been demanded due to the problems of flame retardancy and mechanical properties of the compounded resin. Phosphorus compounds represented by ammonium polyphosphate have the problem of poor flame retardancy, and the resin compositions containing amine phosphate have the problem that the flame resistance is high but the water resistance is poor. Therefore, an amine phosphate surface-treated with a metal has been proposed, but it has not been satisfactory in water resistance. On the other hand, the resin composition containing red phosphorus has problems such as coloring of the resin composition and generation of phosphine gas during processing. Further, at present, inorganic flame retardants represented by magnesium hydroxide and aluminum hydroxide are not always satisfied in terms of flame retardancy.

Under these circumstances, the present inventors have developed a general formula represented by Zn ₂ P ₂ O ₈ C ₂ N ₂ H ₁₀ as a novel flame retardant which can significantly suppress the generation of harmful gas and smoke during combustion. A zinc ethylenediamine phosphate has been found and a patent application has been filed (Japanese Patent Application Laid-Open No. 8-269230), but this ethylenediamine zinc phosphate has not been satisfactory in terms of flame retardancy.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a flame retardant having higher flame retardancy than conventional flame retardants containing no halogen atom. And a method for producing the flame retardant on an industrial scale, and a flame-retardant resin composition containing the flame retardant.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, compared with the conventional zinc zinc ethylenediamine phosphate, the zinc zinc ethylenediamine phosphate newly added with magnesium imparts flame retardancy. Excellent performance,
It has been found that by mixing with a resin or the like, not only sufficient flame retardancy can be exhibited, but also this zinc magnesium ethylenediaminephosphate can be produced by a simple method, and the present invention has been completed.

That is, the present invention relates to the following general formula (1) (Mg _a Zn _1-a ) ₂ P ₂ O ₈ C ₂ N ₂ H ₁₀ (1) (where a is 0.01 to 0.8) ), A method for producing the same, and a flame-retardant resin composition obtained by blending the same.

Hereinafter, the present invention will be described in detail.

In the present invention, zinc magnesium ethylenediamine phosphate refers to a compound represented by the above general formula (1). As specific examples of the ethylenediamine zinc magnesium phosphate of the present invention, compounds having at least the plane spacing shown in Table 1 as an X-ray pattern are exemplified.

[0011]

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Next, a method for producing the zinc magnesium ethylenediamine phosphate will be described.

Although the method for producing zinc magnesium ethylenediamine phosphate of the present invention is not particularly limited,
For example, it can be easily produced by the method of the present invention described below.

In the method of the present invention, first, an aqueous solution of zinc magnesium phosphate in which zinc and magnesium are dissolved in phosphoric acid and an aqueous solution of ethylenediamine are mixed.

In the method of the present invention, an aqueous solution of zinc magnesium phosphate is produced by mixing a zinc compound and a magnesium compound with an aqueous solution of phosphoric acid and uniformly dissolving the mixture.

Magnesium / zinc in the aqueous solution of zinc magnesium phosphate has a molar ratio in the range of 0.01 to 4,
And phosphoric acid / (zinc + magnesium) is 1 to 1 in molar ratio.
2, preferably in the range of 1 to 1.5. When the molar ratio of magnesium / zinc is less than 0.01, the desired flame retardancy cannot be obtained in the obtained product, and when the molar ratio of magnesium / zinc is 4 or more, ethylenediamine phosphorus is contained in the product. It is not preferable because impurities other than zinc magnesium oxide are mixed. On the other hand, when the molar ratio of phosphoric acid / (zinc + magnesium) is less than 1, it is not preferable because impurities other than ethylenediamine zinc magnesium phosphate are mixed into the product, and the molar ratio of phosphorus / (zinc + magnesium) is unfavorable. If it exceeds 2, the amount of unreacted phosphoric acid increases, which is uneconomical.

Specific examples of the zinc compound applicable to the method of the present invention include inorganic acid salts such as zinc sulfate, zinc nitrate, zinc chloride, zinc acetate, zinc perchlorate, zinc benzoate, and zinc citrate. Examples thereof include organic acid salts such as zinc formate, zinc lactate, zinc oleate, and zinc salicylate, zinc metal, zinc oxide, zinc hydroxide, and the like, but can be used without any particular limitation.

Further, as the magnesium compound applicable to the method of the present invention, specifically, magnesium sulfate,
Examples thereof include inorganic acid salts such as magnesium nitrate and magnesium chloride, organic acid salts such as magnesium acetate, magnesium benzoate and magnesium oleate, magnesium metal, magnesium oxide, and magnesium hydroxide, but are not particularly limited and used. It is possible.

When producing an aqueous solution of zinc magnesium phosphate, some zinc compounds or magnesium compounds may not be dissolved in the aqueous solution of phosphoric acid. In such a case, the zinc compound or the magnesium compound is dissolved by using phosphoric acid and an acid other than phosphoric acid. Examples of the acid other than phosphoric acid include hydrochloric acid, nitric acid, and sulfuric acid, but are not particularly limited.

The amount of the acid other than phosphoric acid is not particularly limited, and may be an amount that can uniformly dissolve the zinc compound or the magnesium compound. The zinc compound requiring the use of an acid other than phosphoric acid is metal zinc, zinc oxide, zinc hydroxide and the like, and the magnesium compound is metal magnesium, magnesium oxide, magnesium hydroxide and the like. The concentration of the zinc magnesium phosphate aqueous solution is not particularly limited, and the zinc concentration, the magnesium concentration, and the phosphoric acid concentration may be about several tens to several thousand mmol / l.

Next, an aqueous solution of ethylenediamine is added to this aqueous solution of zinc magnesium phosphate,
(Zinc + Magnesium) is mixed in an amount such that the molar ratio becomes 0.5 to 1.0. If the ethylenediamine / (zinc + magnesium) molar ratio is less than 0.5, it is not preferable because impurities other than ethylenediamine zinc magnesium phosphate are mixed in the product. Ethylenediamine / (Zinc +
If the molar ratio of (magnesium) exceeds 1.0, the amount of unreacted ethylenediamine increases, which is uneconomical.

The method of mixing the aqueous zinc magnesium phosphate solution and the aqueous ethylenediamine solution is not particularly limited. A mixing method such as a method of simultaneously adding an aqueous solution and an aqueous solution of zinc magnesium phosphate into a reaction tank is exemplified.
In the method of the present invention, the mixing of the aqueous solution of zinc magnesium phosphate and the aqueous solution of ethylenediamine is generally performed while stirring to keep the inside of the reaction tank uniform. When adding an aqueous solution of ethylenediamine to an aqueous solution of zinc magnesium phosphate or adding an aqueous solution of zinc magnesium phosphate to an aqueous solution of ethylenediamine, the addition time may be several minutes to several hours. The temperature at the time of mixing is preferably 0 ° C to 50 ° C, more preferably 0 ° C to 3 ° C, in order to prevent impurities other than ethylenediamine-zinc-magnesium phosphate from being mixed, and to manufacture economically.
0 ° C. is particularly preferred.

The concentration of the ethylenediamine aqueous solution is not particularly limited, and may be about several tens to several thousand mmol / l.

In the method of the present invention, the pH of a mixture of an aqueous solution of zinc magnesium phosphate and an aqueous solution of ethylenediamine is adjusted.
Is adjusted to a range of 3 to 8, whereby zinc magnesium ethylenediaminephosphate is crystallized. The pH of the solution obtained by mixing the aqueous solution of zinc magnesium phosphate and the aqueous solution of ethylenediamine is about 2, and at this pH, the solubility of the ethylenediamine zinc magnesium phosphate is low, so that the yield of the obtained ethylenediamine zinc magnesium phosphate is reduced. The pH is adjusted to increase the yield of ethylenediamine zinc magnesium phosphate.

The pH to be adjusted is in the range of 3 to 8 as described above. When the pH to be adjusted is less than 3, the effect of improving the yield of ethylenediamine zinc magnesium phosphate is small, and when the pH is more than 8, impurities other than ethylenediamine zinc magnesium are mixed in the product, which is not preferable.

The method for adjusting the pH to 3 to 8 is not particularly limited. For example, a method of adding an alkali to a mixture of an aqueous solution of zinc magnesium phosphate and an aqueous solution of ethylenediamine, a method of adding an alkali to an aqueous solution of zinc magnesium phosphate before mixing the aqueous solution of zinc magnesium phosphate and the aqueous solution of ethylenediamine, a method of adding an aqueous solution of ethylenediamine in advance And the like.

The alkali used for adjusting the pH is as follows:
Not particularly limited, sodium hydroxide, potassium hydroxide,
A powder such as urea or an aqueous solution thereof, or a gas such as ammonia or an aqueous solution thereof may be used.

In the method of the present invention, aging is performed after adjusting the pH. Aging is a process of mixing and homogenizing the slurry by continuing stirring. The aging time is not particularly limited, but is several minutes to several tens hours, particularly preferably 3 to 24 hours. The aging temperature is 0 to 50 ° C, particularly preferably 0 to 3 ° C.
0 ° C.

The zinc magnesium ethylenediaminephosphate obtained by the above-mentioned method is washed and then separated into a solid and a liquid. The amount of washing water is not particularly limited, and may be an amount by which unreacted substances are removed. Examples of the solid-liquid separation method include, but are not particularly limited to, Nutsche, drum filters, filter presses, belt filters, and the like.

After washing and solid-liquid separation, the amine-containing zinc phosphate containing the piperazine skeleton is dried. The drying temperature is not particularly limited, and may be about 60 to 250 ° C., and the drying time may be several hours to several tens of hours.

By the above method, zinc magnesium ethylenediaminephosphate is produced.

Next, the flame-retardant resin composition of the present invention will be described.

The flame-retardant resin composition of the present invention is a flame-retardant resin composition containing ethylenediamine zinc magnesium phosphate, and if necessary, red phosphorus, a phosphorus compound, a metal compound and 1,3,5- It may contain one or more flame retardants selected from the group consisting of triazine derivatives. Although the detailed reason is unknown, among these flame retardants, red phosphorus and a phosphorus compound are particularly preferable because they exhibit a remarkable synergistic effect on the flame retardant effect with ethylenediamine zinc magnesium phosphate.

Examples of the phosphorus compound include phosphate esters, ammonium polyphosphate, amide-modified ammonium polyphosphate, melamine phosphate, melamine polyphosphate, guanidine phosphate, ethylenediamine phosphate and 1,4-butanediamine phosphate. A preferred example is given.

Examples of the metal compound include magnesium hydroxide, aluminum hydroxide, calcium hydroxide, zinc hydroxystannate, zinc stannate, nickel oxide, cobalt oxide, iron oxide, copper oxide, molybdenum oxide, tin oxide, zinc oxide, Suitable examples include silicon oxide, zeolite, zinc borate, zirconium oxide, antimony trioxide and antimony pentoxide.

The 1,3,5-triazine derivatives include:
Preferable examples include melamine, cyanuric acid, cyanuric acid derivative, isocyanuric acid, isocyanuric acid derivative, melamine cyanurate, melamine isocyanurate and the like.

The resin in which the ethylenediamine zinc magnesium phosphate of the present invention can be blended includes a phenol resin,
Urea resin, melamine resin, unsaturated polyester resin,
Thermosetting resin such as polyurethane, alkyd resin, epoxy resin, low density polyethylene, high density polyethylene,
Ethylene-vinyl acetate copolymer, polystyrene,
Impact-resistant polystyrene, expanded polystyrene, acrylonitrile-styrene copolymer, acrylonitrile-styrene-butadiene copolymer (hereinafter abbreviated as ABS), polypropylene, petroleum resin, polymethyl methacrylate, polyamide, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, Examples thereof include thermoplastic resins such as polyphenylene ether, and further include polymer alloys represented by polycarbonate-ABS, polyphenylene ether-polystyrene and the like in which two or more kinds of thermoplastic resins are mixed. Among these, low-density polyethylene, high-density polyethylene, ethylene-vinyl acetate copolymer, polystyrene, high-impact polystyrene,
Thermoplastic resins such as expanded polystyrene, acrylonitrile-styrene copolymer, acrylonitrile-styrene-butadiene copolymer, polypropylene, petroleum resin, polymethyl methacrylate, polyamide, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, and polyphenylene ether; 2 resin
Polymer alloys typified by polycarbonate-ABS, polyphenylene ether-polystyrene and the like mixed together are exemplified as suitable resins.

The amount of the zinc magnesium ethylenediamine phosphate of the present invention to be mixed with the resin depends on the type of the resin to be mixed and the intended flame retardant performance.
Usually, 150 to 300 parts by weight are blended with respect to parts by weight. Further, the ethylenediamine zinc magnesium phosphate of the present invention, red phosphorus, phosphorus compound, metal compound and 1,
When one or more flame retardants selected from the group consisting of 3,5-triazine derivatives are added, the resin 100
Usually, 5 to 100 parts by weight of the ethylenediamine zinc magnesium phosphate of the present invention, and one or two selected from the group consisting of red phosphorus, a phosphorus compound, a metal compound and a 1,3,5-triazine derivative with respect to parts by weight. 5 or more kinds of flame retardants
２００200 parts by weight.

If necessary, a benzotriazole-based ultraviolet absorber, a light stabilizer of a 2,2,6,6-tetramethylpiperidine derivative, a hindered phenol-based antioxidant, and the like may be added. In this case, the amount is usually 0.05 to 100 parts by weight of the flame-retardant resin composition of the present invention.
5 parts by weight are added. In addition to these, if necessary, an inorganic filler such as an antistatic agent, talc, or glass fiber may be added.

The method of compounding the zinc zinc ethylenediamine phosphate of the present invention into a resin may be, for example, a method in which the zinc magnesium ethylenediamine phosphate of the present invention is dispersed in a resin raw material before mixing with a thermosetting resin. What is necessary is just to harden. When compounding with a thermoplastic resin, for example, a necessary compounding agent may be mixed using a conical blender or a tumbler mixer, and pelletized using a twin-screw extruder or the like. The method for processing the flame-retardant resin composition obtained by these methods is not particularly limited. For example, extrusion molding, injection molding, or the like can be performed to obtain a desired molded product.

[0041]

As is apparent from the above description, the zinc magnesium ethylenediamine phosphate of the present invention is a very useful flame retardant containing no halogen element, and particularly when it is blended with a thermosetting resin or a thermoplastic resin. High flame retardancy can be exhibited. Further, according to the production method of the present invention, the ethylenediamine zinc magnesium phosphate of the present invention can be produced by a simple method, which is an industrially extremely useful technique.

[0042]

EXAMPLES The present invention will be described below in more detail with reference to examples, but the present invention is not limited to these examples.

EXAMPLE 1 225 g of water and 178 g of 75% phosphoric acid were mixed, followed by dissolution of 291 g of zinc sulfate heptahydrate and 23 g of magnesium chloride hexahydrate to form phosphoric acid / (zinc + magnesium). ) = 1.21 molar ratio of zinc magnesium phosphate aqueous solution was prepared. The charging ratio of zinc and magnesium corresponds to a molar ratio of zinc: magnesium = 9: 1.

In the above zinc magnesium phosphate aqueous solution, 22
An aqueous ethylenediamine solution prepared by mixing 5 g of water and 41 g of ethylenediamine was added (ethylenediamine / (zinc + magnesium) = 0.60 molar ratio), and 48%
After adjusting the pH to 7.0 with an aqueous sodium hydroxide solution,
Aged at 30 ° C. for 22 hours to obtain a white powder slurry. Solid-liquid separation of the obtained white powder slurry by Nutsche,
After washing with 2000 g of water, drying at 120 ° C. for 16 hours,
211 g of ethylenediamine zinc magnesium phosphate were obtained.

The yield of the obtained zinc magnesium ethylenediamine phosphate was 99% or more with respect to the total amount of zinc sulfate and magnesium chloride charged. The X-ray diffraction pattern of ethylenediamine zinc magnesium phosphate appeared at the positions shown in Table 1. In addition, elemental analysis was performed on carbon and hydrogen by an elemental analyzer, phosphorus and zinc by an inductively coupled plasma emission spectrometer, and nitrogen by a trace total nitrogen analyzer. As a result, this compound
(Mg _0.1 Zn _0.9) it became clear that compound having a composition of _{2 P 2 O 8 C 2 N} 2 H 10.

Hereinafter, the obtained ethylenediamine zinc magnesium phosphate is referred to as “flame retardant 1”.

Example 2 225 g of water and 178 g of 75% phosphoric acid were mixed, followed by dissolution of 259 g of zinc sulfate heptahydrate and 46 g of magnesium chloride hexahydrate to form phosphoric acid / (zinc + magnesium). ) = 1.21 molar ratio of zinc magnesium phosphate aqueous solution was prepared. The charging ratio of zinc to magnesium corresponds to a molar ratio of zinc: magnesium = 4: 1.

In the above zinc magnesium phosphate aqueous solution, 22
An aqueous ethylenediamine solution prepared by mixing 5 g of water and 41 g of ethylenediamine was added (ethylenediamine / (zinc + magnesium) = 0.60 molar ratio), and 48%
After adjusting the pH to 7.0 with an aqueous sodium hydroxide solution,
Aged at 30 ° C. for 22 hours to obtain a white powder slurry. Solid-liquid separation of the obtained white powder slurry by Nutsche,
After washing with 2000 g of water, drying at 120 ° C. for 16 hours,
206 g of ethylenediamine zinc magnesium phosphate were obtained.

The yield of the obtained zinc magnesium ethylenediamine phosphate was 99% or more with respect to the total amount of the charged zinc sulfate and magnesium chloride. The X-ray diffraction pattern of ethylenediamine zinc magnesium phosphate appeared at the positions shown in Table 1.

The result of elemental analysis performed in the same manner as in Example 1 revealed that the compound was a compound having a composition of (Mg _0.2 Zn _0.8 ) ₂ P ₂ O ₈ C ₂ N ₂ H ₁₀ .

Hereinafter, the obtained zinc magnesium ethylenediaminephosphate is referred to as “flame retardant 2”.

Example 3 225 g of water and 178 g of 75% phosphoric acid were mixed, followed by dissolution of 162 g of zinc sulfate heptahydrate and 114 g of magnesium chloride hexahydrate to form phosphoric acid / (zinc + magnesium). ) = 1.21 molar ratio of zinc magnesium phosphate aqueous solution was prepared. The charging ratio between zinc and magnesium corresponds to a molar ratio of zinc: magnesium = 1: 1.

In the above-mentioned aqueous solution of zinc magnesium phosphate, 22
An aqueous ethylenediamine solution prepared by mixing 5 g of water and 41 g of ethylenediamine was added (ethylenediamine / (zinc + magnesium) = 0.60 molar ratio), and 48%
After adjusting the pH to 7.0 with an aqueous sodium hydroxide solution,
Aged at 30 ° C. for 22 hours to obtain a white powder slurry. Solid-liquid separation of the obtained white powder slurry by Nutsche,
After washing with 2000 g of water, drying at 120 ° C. for 16 hours,
192 g of zinc magnesium ethylenediamine phosphate were obtained.

The yield of the zinc magnesium ethylenediamine phosphate thus obtained was 99% or more based on the total amount of the charged zinc sulfate and magnesium chloride. The X-ray diffraction pattern of ethylenediamine zinc magnesium phosphate appeared at the positions shown in Table 1. Table 2 shows the results of the elemental analysis of the obtained compound.

As a result of elemental analysis in the same manner as in Example 1, it was found that the compound had a composition of (Mg _0.5 Zn _0.5 ) ₂ P ₂ O ₈ C ₂ N ₂ H ₁₀ .

Hereinafter, the obtained zinc magnesium ethylenediaminephosphate is referred to as “flame retardant 3”.

Examples 4 to 9 An ethylene-vinyl acetate copolymer (trade name: Ultracene UE635, manufactured by Tosoh Corporation) was added to the flame retardants 1 to 3 obtained in Examples 1 to 3 and polyphosphoric acid. Ammonic acid (manufactured by Hoechst, trade name: Exolit 462) was blended in parts by weight as shown in Table 2, roll-kneaded at a temperature of 120 ° C, and press-molded at 150 ° C to prepare a flame-retardant resin composition.

The flame retardancy was evaluated by a combustion test method for a polymer material according to the oxygen index method standardized in JIS K7201, and underwriters laboratory in the United States.
The test was performed according to UL94V (1/8 inch thickness of test piece) which is a standard of Tories. The water resistance test was performed on a test piece (3 × 3 × 0.3 cm) prepared by the above method.
It was evaluated by measuring the dissolution rate of the flame retardant when immersed in 100 ml of hot water at 0 ° C. for 2 days. The amount of each flame retardant,
Table 2 shows the evaluation results of the flammability and the water resistance of the resin composition. Table 2 shows the amounts of the respective flame retardants, the evaluation results of the flammability of the resin composition, and the evaluation results of the water resistance.

[0059]

[Table 2]

Comparative Example 1 225 g of water and 178 g of 75% phosphoric acid were mixed, followed by dissolution of 323 g of zinc sulfate heptahydrate to obtain a zinc phosphate aqueous solution having a molar ratio of phosphoric acid / zinc = 1.21. Prepared.

225 g of water and 4
An aqueous solution of ethylenediamine prepared by mixing 1 g of ethylenediamine was added (ethylenediamine / zinc = 0.
(60 mol ratio), the pH was adjusted to 7.0 with a 48% aqueous sodium hydroxide solution, and then aged at 30 ° C. for 22 hours to obtain a white powder slurry. The obtained white powder slurry was solid-liquid separated by Nutsche, washed with 2000 g of water, and then washed with 120 g of water.
At 16 ° C. for 16 hours.
5 g were obtained.

The yield of the obtained zinc ethylenediamine phosphate was 99% or more based on the zinc sulfate charged.

Hereinafter, the obtained ethylenediamine zinc phosphate is referred to as “flame retardant 4”.

Comparative Examples 2 to 8 The ethylene-vinyl acetate copolymer (trade name: Ultracene UE635, manufactured by Tosoh Corporation) was mixed with the ethylenediamine zinc phosphate obtained in Comparative Example 1 and a predetermined amount of the flame retardant in Table 2. Roll kneading at a temperature of 120 ° C.
Press molding was performed at 150 ° C. to prepare a flame-retardant resin composition.

Evaluation of flame retardancy was carried out in the same manner as in Examples 4 to 9. Table 2 shows the amounts of the respective flame retardants and the evaluation results of the flammability of the resin composition.

[0066]

Claims (7)

[Claims] 1. The following general formula (1) (Mg _a Zn _1-a ) ₂ P ₂ O ₈ C ₂ N ₂ H ₁₀ (1) (where a is 0.01 to 0.8) An ethylenediamine zinc magnesium phosphate represented by the formula: 2. A magnesium / zinc molar ratio of 0.01.
To 4 and the molar ratio of phosphoric acid / (zinc + magnesium) is in the range of 1-2, ethylenediamine / (zinc + magnesium) in the molar ratio of 0.5-1. After mixing an amount of the aqueous solution of ethylenediamine in the range described above, the pH of the mixture was adjusted to 3 to 11
2. The method for producing zinc magnesium ethylenediaminephosphate according to claim 1, wherein the preparation is performed in the range described above and further aging is performed. 3. A flame retardant comprising the ethylenediamine zinc magnesium phosphate according to claim 1. 4. A flame-retardant resin composition obtained by blending the flame retardant according to claim 3 with a resin. 5. The flame-retardant resin composition according to claim 4, wherein 150 to 300 parts by weight of the flame retardant of claim 3 is mixed with 100 parts by weight of the resin. 6. A resin comprising the flame retardant according to claim 3 and one or more flame retardants selected from the group consisting of red phosphorus, a phosphorus compound, a metal compound and a 1,3,5-triazine derivative. A flame-retardant resin composition obtained by blending. 7. A resin selected from the group consisting of 5 to 100 parts by weight of the flame retardant of claim 3 in 100 parts by weight of a resin, red phosphorus, a phosphorus compound, a metal compound and a 1,3,5-triazine derivative. The flame-retardant resin composition according to claim 6, wherein 5 to 100 parts by weight of two or more flame retardants are blended.