JPH0356547A - Fire retardant polypropylene resin composition - Google Patents

Abstract

PURPOSE:To obtain the subject composition having excellent fire retardant properties without generation of toxic gas at molding or burning nor breeding of additive by mixing a combination of silane coupling agent, ammonium polyphosphate and nitrogen-containing organic compound, etc. CONSTITUTION:(A) 0.3-5 wt.% silane coupling agent is mixed with (B) 12-25 wt.% ammonium polyphosphate or melamine-modified ammonium polyphosphate, (C) 5-10 wt.% nitrogen-containing organic compound giving non-flammable gas product and carbonaceous residue with thermal decomposition in combination with the component B in the case of being mixed with polypropylene resin and (D) rest % of polypropylene resin so as to make a total amount as 100 wt.%. 1,3,5-triazine derivative, especially oligomer or polymer of 2- piperazinylene-4-morpholino-1,3,5-triazine is preferable as the component C.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a flame-retardant polypropylene resin composition. More specifically, the main ingredient is polypropylene/resin, which does not emit corrosive or toxic gases, has little deterioration in moldability, and has a high degree of flame retardant performance when molded. The present invention relates to a flame-retardant polypropylene resin composition that allows molded products with very little flame retardant to bleed onto the surface of the molded product under high humidity conditions.

? Since then, polypropylene resin has been known for its processability, chemical resistance,
Because of its good weather resistance, electrical properties, and mechanical strength, it is widely used in various fields such as household electrical products, buildings, interior decoration, and automobile parts.

(Prior art) Polypropylene resin is originally a resin that easily burns, but as the applications for which it is used expand, polypropylene resin is also required to have performance as a flame retardant material, and the performance requirements are becoming stricter year by year. There is. Various flame-retardant polypropylene resin compositions have been proposed to meet these demands.

For example, JP-A-53-92855, JP-A-54-2
9350, JP 54-77658, JP 56-26954, JP 5'l-87462
A composition in which a hydrous inorganic compound (for example, magnesium hydroxide, aluminum hydroxide, hydrotalcite, etc.) is added to a polypropylene resin, as disclosed in JP-A-60-110'738, etc. For example, as disclosed in Japanese Patent Publication No. 55-30'!39, polyethylene with a melt index of 0.01 to 2.0 and decapromo diphenyl ether (or dodecachlorododecahydromethanodipenzocyclooctene) and Composition in which one or more inorganic fillers selected from powdered talc, kaolinite, sericite, silica, and diatomaceous earth are added to polypropylene resin, JP-A-52-1464
As disclosed in Japanese Patent Application Laid-Open No. 59-147050, ammonium phosphate (or amine phosphate) and the group >C=O (or >C=S or) NH) inserted into the cyclic structure. A composition in which a reaction product of a nitrogen-containing organic compound and an aldehyde or an oligomer (or polymer) of a 1,3.5-triazine derivative is added to a polypropylene resin has been proposed.

However, in a composition in which a hydrous inorganic compound is added to a polypropylene resin, for example, a composition in which magnesium hydroxide is added, a large amount of the hydrous inorganic compound must be added in order to impart a high degree of flame retardance. As a result, the composition has poor moldability.

In addition, molded bottoms containing halogen compounds have relatively little deterioration in molding processability and can produce molded products with a high degree of flame retardancy, but when molded or when the molded product burns, corrosive gases and The drawback is that it generates toxic gases.

Also, JP-A-52-146452, JP-A-59-
The flame-retardant polypropylene resin composition disclosed in Publication No. 147050 has relatively little deterioration in formability, and corrosive gas or toxic gas may be generated during molding or when the molded product is burned. few.

However, due to the hygroscopic nature of ammonium phosphate (or amine phosphate) in the composition, ammonium phosphate (or amine phosphate) may be absorbed onto the surface of the molded product under high humidity conditions such as during the rainy season. Severe lead phenomenon occurs and the electrical resistance value of the shaped product is significantly reduced, so it has the disadvantage that it cannot be used as an electrical insulating material under high humidity conditions.

(Problems to be Solved by the Invention) The present inventors have developed a product that has a high degree of flame retardancy, does not generate corrosive gas or toxic gas during molding or combustion of the molded product, and has excellent moldability. We conducted extensive research in order to obtain a flame-retardant polypropylene/resin composition that can produce molded products with little deterioration and very little bleeding of the flame retardant component onto the surface of the molded product under high humidity conditions such as during the rainy season.

As a result, when mixed with olefinic synthetic rubber or silane coupling agents (or both), ammonium polyphosphate or melamine-modified ammonium polyphosphate as well as polypropylene resins, the combination with ammonium polyphosphate or melamine-modified ammonium polyphosphate A specific type of nitrogen-containing organic compound or a mixture of two or more types of Fi (hereinafter referred to as a nitrogen-containing organic metal compound) that can give a non-flammable gas product and a carbonaceous residue by thermal decomposition is blended into a polypropylene resin. The inventors have discovered that the above-mentioned composition can solve the above-mentioned problems, and have completed the present invention based on this knowledge.

As is clear from the above description, an object of the present invention is to provide a flame-retardant polypropylene resin composition from which a molded article having a high degree of flame retardancy can be obtained, which solves the above-mentioned problems.

(Means for Solving the Problems) The flame-retardant polypropylene resin composition of the present invention has the following three types of configurations.

(1) Considering the total of (A) to CD) below as 100 weight units, (A) Silane coupling agent 0.3 to 5 weight units (B) Ammonium polyphosphate or melamine modified ammonium polyphosphate 12 to 25 weight units (C) 5 to 10 nitrogen-containing organic compounds by weight? A flame-retardant polypropylene resin composition that is a DJ remaining polypropylene resin.

(2) Assuming that the total from (B) to (El below is 100% by weight), (El ole7-based synthetic rubber 3-251ii% (Bl ammonium polyphosphate or melan modified ammonium polyphosphate 12-25% by weight fc ) A nitrogen-containing organic compound (5 to 10% by weight) (D) A flame-retardant polypropylene resin composition.

(3) From the following (A) to (assuming the total of El to 100 weight units) silane coupling agent 0.3 to 5 weight units (E) olefinic synthetic rubber 3 to 25 weight units B) ammonium polyphosphate or Melamine-modified ammonium polyphosphate 2 to 25% by weight (C) Nitrogen-containing organic compound 5 to 10% by weight (D) A flame-retardant polypropylene resin composition with the remainder being polypropylene/resin.

(4) As the nitrogen-containing organic compound, a reaction product of ethylene urea and formaldehyde, a reaction product of ethylene thiourea and formaldehyde, or the following general formula [! 1,3.5-} riazine derivatives having the structure represented by the following formula or 28I [according to any one of the above items 1, 2, or 3 using a mixture of the above. Flame retardant polypropylene resin composition.

X [wherein, ] The polypropylene resin used in the present invention includes crystalline propylene homopolymer, propylene as a main component, propylene and ethylene, butene-1, pentene-1, hexene-1, 4-methylpentene-1, heptene-1, octene-1, and octene-1. -l1 A crystalline copolymer with one or more selected from the group of decene-1 or a mixture of two or more of these can be mentioned. In particular, crystalline ethylene-propylene block cold polymers are desirable.

The Shirai coupling agent used in the present invention is generally a hydrocarbon group containing a vinyl group, a chloro group, an amino group, a mercapto group, etc., or a hydrolyzable organic group. , R′ minus R or X,
Each R (when there are two R's) and each X may be different from each other. ). For example, vinyltrimethoxysilane, vinyltriethoxysilane, 3-aminopropyltriethoxysilane, N-(2-aminoethyl)3-aminopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-chloro It refers to probyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-mercaptobrobyltrimethoxysilane, and the like. It is preferable to use vinyltrimethoxysilane, vinyltriethoxysilane, and 3-mercaptobrobyltrimethoxysilane from the viewpoint of preventing the flame retardant from bleeding under high humidity conditions.

The blending ratio of the silane coupling agent is 0.3 to 5 weight, preferably 0.5 to 3 weight, particularly preferably 0.5 to 1 weight, based on the composition. The blending ratio is 0.
If the weight is less than 3 weight, the effect of preventing the flame retardant from bleeding under high humidity conditions is poor, and if it exceeds 5 weight, the flame retardancy will decrease, which is not preferable.

Examples of the olefin-based synthetic rubber used in the present invention include tri, for example: r = , ethylene-propylene rubber, ethylene-propylene-diene rubber, ethylene-1-butene rubber, ethylene-vinyl acetate rubber, and the like. Among them, it is preferable to use ethylene-propylene rubber and ethylene-propylene-diene rubber from the viewpoint of maintaining a high degree of flame retardancy.

The blending ratio of the olefin synthetic rubber is 3 to the composition.
-25% by weight, preferably 3-20% by weight, particularly preferably 3-15% by weight.

If the blending ratio is less than 3% by weight, the effect of preventing flame retardant from bleeding under high humidity conditions will be poor, and if it exceeds 25% by weight, the rigidity will decrease and the good mechanical strength and heat resistance inherent to polypropylene will be lost, so it is preferable. do not have.

As the ammonium polyphosphate or melamine-modified ammonium polyphosphate used in the present invention, commercially available products may be used as they are, and examples of commercially available ammonium polyphosphate include Sumisaf P (trade name, manufactured by Sumitomo Chemical Co., Ltd.).
and Exolit 4 2 2 (trade name, manufactured by Hoechst), melamine-modified ammonium polyphosphate such as Sumisaf PM (trade name, manufactured by Sumitomo Chemical Co., Ltd.) and E
xolit 4 6 2 (product name, Hoechst jO!)
etc. can be given. The blending ratio of the ammonium polyphosphate or melamine-modified ammonium polyphosphate is 12 to 25 weight s based on the composition. The blending ratio is 12
If the amount is less than 25 parts by weight, a composition that achieves a high degree of flame retardancy cannot be obtained, and even if it exceeds 25 parts by weight, no further flame retardant improvement effect can be obtained.

When the nitrogen-containing organic compound used in the present invention is mixed with polypropylene resin in combination with ammonium polyphosphate or melamine-modified ammonium polyphosphate, non-flammable gas products or It is a mixture or reaction product of two or more types. Examples of these compounds include ethylene urea, ethylene thiourea, hydantoin, hexahydropyrimidin-2-one, piperazine-3,6-dione, parbituric acid, uric acid, dicyandiamide and their reaction products with aldehydes, piperazine and reaction product with diphenyl carbonate, reaction product of imidazolidin-2-one with diphenyl carbonate, oligomer or polymer of 2-biperazinylene-4-morpholino 1.3.5-}riazine or 2-piperazinylene-4-piveridino −
1.3.5 -} Examples include oligomers or polymers of riazine.

Among these, it is a reaction product of ethylene urea and formaldehyde, a reaction product of ethylene thiourea and formaldehyde, or a 1,3.5-triazine derivative having a structure represented by the following general formula [I]. 2-
Piperazinylene-4-morpholino 1.3.5 − }
The use of lyazine oligomers or polymers and 2-piperazinylene-4-piperidino-1.3.5-}lyazine oligomers or polymers is
It is preferable from the viewpoint of maintaining a high degree of flame retardancy.

Y [wherein, X is a morpholino group or a piperidino group, Y is a divalent group of piperazine, and n is an integer of 2 to 50. ] The blending ratio of the nitrogen-containing organic compound to the composition is 5 to 5.
10 weight condolences. If the blending ratio is less than 5% by weight, a composition that achieves a high degree of flame retardancy cannot be obtained, and even if the blending ratio exceeds 10% by weight, no further flame retardant improvement effect can be obtained.

In addition, the nitrogen-containing organic compound, the reaction product of the above-mentioned ethylene urea and formaldehyde, or the reaction product of ethylene thiourea and formaldehyde, or 2-
Biperazinylene-4-morpholino 1.3.5-}
The oligomer or polymer of liazine and the oligomer or polymer of 2-biperazinylene-4-piperidino-1.3.5-triazine can be obtained, for example, by the following method.

Reaction of ethylene thiourea and formaldehyde To obtain a certain product, dissolve ethylene thiourea 50F in 1 liter of water, adjust the pH in the solution to 2 by mixing dilute acid (e.g. sulfuric acid or phosphoric acid), and proceed with the reaction. Heat the solution to 90°C, drop 37% by weight of an aqueous solution of formaldehyde into the ethylenethiourea solution until the molar ratio of C}1.07 ethylenethiourea is equal to 2, and stir vigorously while maintaining the temperature at 90°C. . The precipitate obtained in the form of a very fine powder can be obtained by filtration, washing with water and drying. Moreover, when obtaining a reaction product of ethylene urea and formaldehyde, it can be obtained by the same method as above.

The oligomer or polymer of 2-biperazinylene-4-morpholinol,3,5-triazine is prepared in equal moles of 2
．． 6-dihalo-4-morpholino 1.3.5-}riazine (e.g. 2,6-dichloro-4-morpholino 1
．． 3.5-triazine or 2,6-dipromo-
4-morpholino 1.3.5-}riazine) and piperazine in the presence of an organic or inorganic base (e.g. triethylamine, triptylamine, sodium hydroxide, potassium hydroxide, sodium carbonate, etc.) in an inert solvent such as xylene. After the reaction is completed, the reaction mixture is filtered to separate the solids, and the solids are washed with boiling water to remove the by-product salts. It can be obtained by dissolving and removing boiling water and then drying the remaining solid matter.

Also, 2-piperazinylene-4-piperidino-1.3
．． 5-triazine oligomer or polymer, equimolar amounts of 2,6-cyhalo-4-piperidino-1.3.
5-}riazine (e.g. 2,6-dichloro-4-biperidino-1.3.5-triazine or 2.6
-dipromo-4-piperidino-1.3.5-triazine) and piperazine with an organic or inorganic base (e.g. triethylamine, triptylamine, sodium hydroxide,
Using an inert solvent such as triisoglobylbenzene in the presence of potassium hydroxide, sodium carbonate, etc., under heating, preferably at the boiling point of the inert solvent, and after the reaction is complete, the reaction mixture is filtered. It can be obtained by separating the solid matter, washing the solid matter with boiling water to remove the by-product salt by dissolving it in the boiling water, and then drying the remaining solid matter.

In the composition of the present invention, various additives normally added to polypropylene resins, such as antioxidants, antistatic agents, lubricants, neutralizing agents (metal stearate, hydrotalcite, etc.), and pigments may be used in combination. I can do it.

The flame-retardant polypropylene/resin composition of the present invention can be produced, for example, by the following method.

That is, the above-mentioned silane coupling agent or olefin synthetic rubber (or both) is added to the polypropylene resin,
Ammonium polyphosphate or melamine-modified ammonium polyphosphate, one or more mixtures selected from nitrogen-containing organic compounds, and predetermined amounts of the above-mentioned various additives are stirred and mixed in a mixing device such as a Hensel mixer (trade name),
Super mixer tumbler mixer 1, 1~1
After stirring and mixing for o minutes, the resulting mixture is melt-kneaded using a roll, an extruder, etc. at a melt-kneading temperature of 170 to 220°C, and the mixture is pelletized.

(Examples) Hereinafter, the present invention will be specifically explained using Examples and Comparative Examples, but the present invention is not limited thereto. The evaluation method used in Examples and Comparative Examples was as follows.

1) Compliant with the vertical combustion test of Flame Retardant UL Subject 94 (Underwriter Laboratories Inc.) "Flammation Test of Plastic Materials for Equipment Parts". The wall thickness of the test piece was 3.0fl.

2) Evaluation of bleedability under high humidity conditions A test piece with a length of 95 wa x width of 95 tm x 2 H of thickness was molded using an injection molding machine, and was heated at a constant temperature of 80°C and humidity of EOL. It was left standing in a constant humidity tank (manufactured by Tapai MFG) and taken out every day.

The removed test piece was dried for 2 hours in a constant temperature dryer (manufactured by Sanyo Electric Co., Ltd.) adjusted to a temperature of 80°C, and left overnight in a desiccator at room temperature. I looked under the eye. Furthermore, the surface electrical resistance value of each test piece before the humidification treatment and after 7 days of the humidification treatment was measured using a vibrating volume type microcurrent electrometer (manufactured by Takeda Riken).

Example 1, Comparative Example 1 Polypropylene/resin, ethylene content 8.5% by weight, melt flow rate (temperature 230°C, load 2.1%)
Discharge amount of molten resin for 10 minutes when adding #6)
2 0 f/. 10 minutes crystalline ethylene-propylene block copolymer 6.9 kg, vinyltrimethoxylan [Cyla Ace (trademark) 8210, manufactured by Chisso Corporation] l
oot, ammonium polyphosphate [Sumisafe P (trademark)
manufactured by Sumitomo Chemical Co., Ltd.] 2.1 kg, 2-biperazinylene-4-morpholino 1,3 as a nitrogen-containing organic compound
．． 800 tons of 5-triazine polymer (n=11, molecular weight about 2770), 15 tons of 2,6-di-t-butyl-p-cresol, dimyristyl-β, β-thiodibropionate 2Of and calcium stearate lots as various additives. Hensel mixer (product name)
and stirred and mixed for 3 minutes. The resulting mixture was
The mixture was melt-cross-extruded using a 5 m extruder at a melt cross-wire temperature of 200° C. and pelletized.

In addition, as Comparative Example 1, 1,000 ml of polypropylene resin was used.
Each compounded component was put into a Hensel mixer (trade name) at the mixing ratio according to Example 1, except that no silane coupling agent was added, and the mixture was stirred and mixed, melt-cross-extruded, and pelletized according to Example 1. It became.

Examples 2 to 6 Pelletization was carried out in accordance with Example 1, except that the type of silane coupling agent was changed to one listed in Table 1.

Examples '7 to 9, Comparative Examples 2 to 3 Pelletization was performed according to Example 1, except that the blending ratios of the polypropylene resin and the silane coupling agent were changed to those shown in Table 1.

Example 10 Pelletization was carried out in accordance with Example 1, except that a reaction product of ethylene urea and formaldehyde was used as the nitrogen-containing organic compound.

The pellets obtained in Examples 1 to 101 and Comparative Examples 1 to 3 were
After drying at a temperature of 00°C for 3 hours, the pellets were used to evaluate flame retardancy and bleedability under brining in an injection molding machine with the maximum cylinder temperature set at 220°C. The results are shown in Table 1.

As is clear from Table 1, by blending the silane coupling agent, the lead properties under high temperature and high humidity conditions are improved, and the blending ratio of the silane coupling agent is 0.3.
It can be seen that a weight ratio of 1 to 5 weight is preferable.

Example 11, Comparative Example 4 As polypropylene resin, ethylene content was 8.5% by weight, melt flow rate (temperature 230°C, load 2.1%).
Discharge amount of molten resin for 10 minutes when adding #6)2
0f/10 min crystalline ethylene-propylene block copolymer 6.0 #I, 1.0 kg of ethylene-propylene rubber (Ep-02F1 manufactured by Japan Synthetic Rubber Co., Ltd.) as an olefin-based synthetic rubber, ammonium polyphosphate [Sumise] 7
P (trademark) manufactured by Sumitomo Chemical Co., Ltd.] 2.1k9, 2-piperazinylene-4-morpholino 1.3.5 -} lyazine polymer (n-11) as a nitrogen-containing organic compound
, molecular weight approximately 2g 7o) 800t, as various additives 2,
15 tons of 6-di-t-butyl-p-cresol, 20F of di-i-listyl-[beta],[beta]-thiodipropione], and a lot of calcium stearate were placed in a Hensel mixer (trade name) and stirred and mixed for 3 minutes. The obtained mixture was melt-cross-extruded using an extruder with a diameter of 45 fl at a melt-mixing temperature of 200° C. to form pellets.

In addition, as Comparative Example 4, a polypropylene resin material was used. Okgt
The ingredients were put into a Hensel mixer (trade name) at the mixing ratio according to Example 11, except that ethylene-propylene rubber was not mixed, and the mixture was stirred and mixed, melt-cross-extruded, and pelletized according to Example 11. did.

Examples 12 to 13, Comparative Example 5 Pelletization was performed in accordance with Example 11, except that the blending ratios of the polypropylene resin and ethylene-propylene rubber were changed to the blending ratios shown in Table 2.

After drying the pellets obtained in Examples 11 to 13 and Comparative Examples 4 to 5 for 3 hours at a temperature of 100°C, the pellets were used to mold flame retardants using an injection molding machine with the maximum temperature of the cylinder set at 220°C. , and predetermined test pieces for evaluation of leadability were shaped. The test pieces were used to evaluate flame retardancy and lead properties under high temperature and high humidity conditions. The results are shown in Table 2.

As is clear from Table 2, by blending ethylene-propylene rubber, the lead properties under high temperature and high humidity conditions are improved, and it can be seen that the blending ratio of ethylene-propylene rubber is preferably 3 to 25% by weight. .

Example 14, Comparative Example 6 As polyglobylene resin, ethylene content was 8.5% by weight, melt flow rate (temperature [230°C, load 2.1%).
Discharge amount of molten resin per 10 minutes when adding #6)2
Crystalline ethylene-propylene block copolymer 5.9 # of 0 f/lo, ethylene-propylene rubber (BP-02P, Japan Gokai Rubber Co., Ltd.) as an ole7-based synthetic rubber
[manufactured by] 1.0#, vinyltrimethoxysilane [SiLaAce <am> S210, manufactured by Chisso Corporation] root, ammonium polyphosphate [Sumisafe P (trademark) manufactured by Sumitomo Chemical Industries, Ltd.] 2. 1ic9,
As a nitrogen-containing organic compound, a polymer of 2-piperazinylene-4-morpholino 1,3.15-triazine (
n-1 1, molecular weight approximately 2770) 800t, 2.6-di-t-butyl-p-cresol 15F as various additives. 20 tons of dimyristyl β,β-thiodiglobionate and a lot of calcium stearate were placed in a Hensel mixer (trade name) and mixed by stirring for 3 minutes. The resulting mixture was melted in an extruder with a diameter of 45 mm at a temperature of 20 mm.
In addition, as Comparative Example 6, polypropylene resin was prepared by melt cross-extrusion at 0°C and pelletized. Using an O-mixer, put each compounded component into a mixer (trade name) at the mixing ratio according to Example 14, except for mixing ethylene-propylene rubber and silane coupling agent, and mix according to Example 14. The mixture was stirred and mixed, melted and extruded into pellets.

Examples 15-21, Comparative Examples 1-9 Pelletization was performed according to Example 14, except that the blending ratios of polypropylene resin, ethylene-propylene rubber, and silane coupling agent were changed to those shown in Table 3.

After drying the pellets obtained in Examples 14 to 21 and Comparative Examples 6 to 9 for 3 hours at a temperature of 100°C, the koji flammability was evaluated using an injection molding machine with the maximum temperature of the cylinder set at 220°C. , and predetermined test pieces for evaluation of leadability were shaped. The test pieces were used to evaluate flammability and lead properties under high temperature and high humidity conditions. The results are shown in Table 3.

As is clear from Table 3, it can be seen that even when both the 7-run coupling agent and ethylene-propylene rubber are used in combination, the lead properties under high temperature and high humidity conditions are improved.

(Effects of the Invention) The composition of the present invention has very little tendency to bleed onto the surface of molded products even under high humidity conditions, has a high degree of flame retardancy, and is corrosive when forming or burning molded products. It is a combustible polypropylene resin composite that can be used to obtain molded products that do not emit gas or toxic gases, and is therefore suitable for buildings, interior decoration,
It can be suitably used for manufacturing parts of household electrical appliances, parts for automobiles, etc.

that's all

Claims (1)

[Scope of Claims] (1) The total of the following (A) to (D) is 100 weight, (A) Silane coupling agent 0.3 to 5% by weight (B) Ammonium polyphosphate or melamine-modified polyphosphoric acid 12-25 wt. ammonium, (C) in combination with ammonium polyphosphate or melamine-modified ammonium polyphosphate when mixed with polypropylene resin, capable of giving non-flammable gaseous products and carbonaceous residues upon pyrolysis; One type or a mixture of two or more types of nitrogen-containing organic compounds (hereinafter referred to as nitrogen-containing organic compounds) 5 to 10% by weight (D) A flame-retardant polypropylene resin composition with the remainder being polypropylene resin. (2) The total of (B) to (E) below is 100% by weight.
(E) 3 to 25% by weight of olefinic synthetic rubber (B) 12 to 25% by weight of ammonium polyphosphate or melamine-modified ammonium polyphosphate (C) 5 to 10% by weight of nitrogen-containing organic compound (D) The remaining polypropylene resin A flame retardant polypropylene resin composition. (3) The total of the following (A) to (E) is 100% by weight.
(A) 0.3-5% by weight of silane coupling agent (E) 3-25% by weight of olefin synthetic rubber (B) 12-25% by weight of ammonium polyphosphate or melamine-modified ammonium polyphosphate (C) Nitrogen-containing 5 to 10% by weight of organic compound (D) A flame-retardant polypropylene resin composition with the remaining polypropylene resin. (4) As a nitrogen-containing organic compound, a reaction product of ethylene urea and formaldehyde, a reaction product of ethylene thiourea and formaldehyde, or a 1,3,5- having a structure represented by the following general formula [I] Any one of claim 1, claim 2, and claim 3 in which one or a mixture of two or more selected from triazine derivatives is used.
The flame-retardant polypropylene resin composition described in . ▲There are mathematical formulas, chemical formulas, tables, etc.▼ [I] [In the formula, X is a morpholino group or piperidino group, Y is a divalent group of piperazine, and n is an integer from 2 to 50. (5) As polypropylene resin, crystalline propylene homopolymer, propylene as main component, propylene and ethylene, butene-1, pentene-1, hexene-1, 4-
Claim 1, Claim 2, or Claim 2, wherein a crystalline copolymer with one or more selected from methylpentene-1, heptene-1, octene-1, and decene-1 or a mixture of two or more thereof is used. 3. The flame-retardant polypropylene resin composition according to any one of 3.