JP2010047703A - Flame-retardant resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flame-retardant resin composition having excellent acid resistance, and a synthetic resin flame-retardant treatment technology satisfactorily preventing occurrence of white fumes during a kneading process and silver streak in a molded product totally. <P>SOLUTION: The flame-retardant resin composition comprises 100 pts.wt. of a synthetic resin, 5-150 pts.wt. of an aluminum salt hydroxide particle flame retardant containing a mineral usually called alunite, 5-150 pts.wt. of the total of magnesium hydroxide particles and/or metallic oxide particles, and 20 pts.wt. of at least one selected from the following ingredients (A)-(C) as a flame-retardant assistant: (A) a phosphorus compound; (B) carbon powder; and (C) a silicone. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a flame retardant resin composition having acid resistance and a molded article formed therefrom. Specifically, it is selected from 5 to 150 parts by weight of aluminum salt hydroxide particles, 5 to 150 parts by weight of magnesium hydroxide particles and / or metal oxide particles, and (A) a phosphorus compound, (B) carbon powder and (C) silicone. In addition, the present invention relates to a flame retardant resin composition containing 20 parts by weight or less of at least one flame retardant aid.

As a non-halogen flame retardant technology having excellent acid resistance, Japanese Patent Application No. 2008-176742 proposed a flame retardant technology using aluminum salt hydroxide particle particles. However, the technology still has problems to be improved.
That is, the water adhering to the aluminum salt hydroxide particles during kneading generates white smoke during heating during the resin composition production, and if the molding method such as injection molding is not carefully molded, silver streaks are formed in the molded product. The problem that occurred was left.

Japanese Patent Application No. 2008-176742

Conventionally, there has been a method of adding aluminum hydroxide as a non-halogen flame retardant technology having excellent acid resistance. However, in the method of adding aluminum hydroxide, if kneading or injection molding is performed at a temperature of 170 ° C. or higher, particularly 200 ° C. or higher due to the release of water accompanying thermal decomposition of the structural water of aluminum hydroxide, foaming is dangerous. It was.

As a technique for solving this problem, Japanese Patent Application No. 2008-176742 proposed a flame retarding treatment technique using aluminum salt hydroxide particle particles.
This technique eliminates the risk of foaming during kneading and molding. However, the technology still has problems to be improved. That is, the water adhering to the aluminum salt hydroxide particles during kneading generates white smoke during heating during the resin composition production, and if the molding method such as injection molding is not carefully molded, silver streaks are formed in the molded product. The problem that occurred was left. The object of the present invention is to provide a technology for further preventing the generation of white smoke during kneading and silver streaks in molding methods such as injection molding in the flame retardant treatment technology of synthetic resins, while retaining the advantages of Japanese Patent Application No. 2008-176742. Is to provide.

The present inventor paid attention to the acid resistance exhibited by aluminum salt hydroxide particles containing a mineral called a so-called alunite, and examined whether it can be applied to a flame retardant technology. As a result, when only aluminum salt hydroxide particles are blended into a synthetic resin as a flame retardant, the acid resistance of the synthetic resin is very good, but if not carefully molded, white smoke is generated during kneading by heating, and injection molding As a result, a problem that silver streaks occur in a molded product in a molding method such as the above has been found. The present inventor further researched and selected from 5 to 150 parts by weight of aluminum salt hydroxide particles and 5 to 150 parts by weight of a total amount of magnesium hydroxide particles and / or metal oxide particles, and a phosphorus compound, carbon powder and silicone. In addition, it has been found that a synthetic resin composition in which flame retardancy and generation of silver streak are suppressed can be obtained by containing at least one kind as a flame retardant aid in an amount of 20 parts by weight or less, and the present invention has been completed.

The flame retardant composition of the present invention comprises aluminum salt hydroxide particles, magnesium hydroxide particles and / or metal oxide particles, and at least one kind of difficulty selected from the following (A), (B) and (C): Contains 20 parts by weight or less of a fuel aid.
(A) Phosphorus compound (B) Carbon powder (C) Silicone

The aluminum salt hydroxide particles used in the present invention are essential to ensure acid resistance, but by themselves, the effect of imparting flame retardancy to the resin is extremely low, and the use of aluminum salt hydroxide particles at a high concentration is as described above. Since there is a problem of white smoke and silver streak generation, it is highly effective in imparting flame retardancy to the resin, and magnesium hydroxide particles that do not have the problem of white smoke and silver streak generation are used in combination, or a metal oxide is used in combination. . When a metal oxide is added, it not only absorbs moisture released from the aluminum salt hydroxide particles in the heating step of kneading and molding the resin composition, but also becomes a metal hydroxide as a flame retardant as a result of moisture absorption. Also works. Such moisture absorption prevents the generation of white smoke and silver streaks.
In addition, the above components (A), (B) and (C) are generally used as flame retardant aids for metal hydroxide flame retardants, but these flame retardant aids only give flame retardancy to the resin. It is difficult to do.

The present inventors combine aluminum salt hydroxide particles, magnesium hydroxide particles and / or metal oxides, and further at least one selected from the components (A), (B) and (C) up to 20 parts by weight. It was possible to improve not only the flame retardancy with respect to the resin but also improve it.

The aluminum salt hydroxide particles used in the present invention are represented by the following formula 1.
Wherein M is at least one cation selected from the group consisting of Na ⁺ , K ⁺ , NH ₄ ⁺ , H ₃ O ⁺ and Ca ²⁺ , and M ′ is Zn ²⁺ , Ni ²⁺ , Sn ⁴⁺ , Zr ^At least one metal cation selected from the group consisting of ⁴⁺ and Ti ⁴⁺ , A represents at least one organic acid anion, B represents at least one inorganic acid anion, and a, b, m, n, x, y and z are 0.7 ≦ a ≦ 1.35, 2.7 ≦ b ≦ 3.3, 0 ≦ m ≦ 5, 4 ≦ n ≦ 7, 0 ≦ x ≦ 0.6, 1.7 ≦ y ≦ 2.4, 0 ≦ z ≦ 0.5)
There are no other constraints for using the aluminum salt hydroxide particles in the present invention, but in order to use them suitably, the average secondary particle diameter is 0.5-2 μm, and the BET specific surface area is 1-20 m ² / g which is close to the monodispersion shown in WO2005 / 085168 and WO2006 / 109847 is preferred.
The magnesium hydroxide particles used in the present invention have an average secondary particle size of 0.1 to 5 μm, preferably 0.4 to 2.0 μm, and a BET specific surface area of 1 to 30 m ² / g, preferably 1 to 10 m ² /. g. The metal oxide particles used in the present invention have an average secondary particle size of 0.1 to 10 μm, preferably 0.5 to 3 μm, and a BET specific surface area of 1 to 200 m ² / g, preferably 10 to 60 m ² / g. is there. Examples of the metal oxide particles include oxides composed of elements such as magnesium, calcium, zinc, nickel, and titanium, but they may be solid solutions. Magnesium oxide is preferred because it absorbs moisture, and as a result of absorbing moisture, it becomes magnesium hydroxide and has high flame retardancy.

In the above formula 1, the organic acid anion represented by A is at least one selected from oxalate ion, citrate ion, malate ion, tartrate ion, glycerate ion, gallate ion and lactate ion. preferable.

In the above formula 1, the inorganic acid anion represented by B is at least one selected from SO ₄ ²⁻ , PO ₄ ³⁻ , NO ₃ ⁻ , SiO ₃ ²⁻ , SiO ₄ ⁴⁻ , HSi ₂ O ₅ ^−. However, SO ₄ ²⁻ is most preferable in terms of uniform particle diameter.

A, b, m, n, x, y and z in the above formula 1 are 0.7 ≦ a ≦ 1.35, 2.7 ≦ b ≦ 3.3, 0 ≦ m ≦ 5, 4 ≦ n. ≦ 7, 0 ≦ x ≦ 0.6, 1.7 ≦ y ≦ 2.4, 0 ≦ z ≦ 0.5 are preferred, but the most preferred range is 3.6 ≦ a + b ≦ 4.4, 0 <= M <= 2, 0 <= x <= 0.3, 7.5 <= y + n <= 8.5.

The aluminum salt hydroxide particles used in the present invention can be easily synthesized by referring to the methods and examples described on page 13, line 23 to page 13, line 25 of the republished patent specification WO2005 / 085168. Can do.
In particular, when z = 0 in the above formula 1, that is, aluminum salt hydroxide particles not containing organic acid ions, see the methods and examples described in paragraphs 0016 to 0020 and paragraphs 0045 to 0059 of WO 2006/109847. It can be easily synthesized.

The shape of the aluminum salt hydroxide particles synthesized by the method described in the above document varies depending on the types of metal cations M and M ′ and organic acid anion A in Formula 1 above. The shape is known to exhibit a spherical shape, a meteorite shape (disc shape), a cubic shape, a hexagonal plate shape, a disc shape, a rice grain shape, and the like, but the effects of the present invention are manifested regardless of the shape.

In the flame retardant used in the present invention, red phosphorus, phosphate ester, condensed phosphate ester, and polyphosphate can be used as the phosphorus compound as component (A).

In the flame retardant aid used in the present invention, carbon black, graphite, and activated carbon can be used as the carbon powder as the component (B).

In the flame retardant aid used in the present invention, as the silicone of component (C), compounds containing organopolysiloxane as a main component, that is, silicone resin, silicone grease, silicone rubber and silicone oil can be used.

The synthetic resin used in the present invention may be any resin as long as it is usually used as a molded product. Examples thereof include polyethylene, polypropylene, ethylene / propylene copolymer, polybutene, and poly-4-methylpentene-1. Polymers or copolymers of such C2 to C8 olefins (α-olefins), copolymers of these olefins and dienes, ethylene-ethyl acrylate copolymers, TPO resins, ethylene vinyl acetate copolymer resins, polyvinyl chloride , Vinyl resins such as vinyl acetate resin, polystyrene resins such as polystyrene, ABS resin, AAS resin, AS resin, MBS resin, phenoxy resin, polyacetal, nylon 6, nylon 66, nylon 12, nylon 46, nylon 11, etc. Thermoplastic resins such as polyamide resin and methacrylic resin It can be shown.
Furthermore, thermosetting resins such as epoxy resin, phenol resin, melamine resin, unsaturated polyester resin, alkyd resin, urea resin, and EPDM, butyl rubber, isoprene rubber, SBR, NIR, urethane rubber, butadiene rubber, acrylic rubber, silicone rubber A synthetic rubber such as

Judging from the aspects of flame retardancy, white smoke generation prevention, and silver streak generation prevention, in the flame retardant resin composition of the present invention, the blending amount of the aluminum salt hydroxide particles with respect to 100 parts by weight of the synthetic resin is 5 to 150. It may be in the range of parts by weight, more preferably 5 to 100 parts by weight, and most preferably 5 to 50 parts by weight. The total amount of magnesium hydroxide and / or metal oxide may be in the range of 5 to 150 parts by weight, more preferably 5 to 100 parts by weight, and most preferably 5 to 50 parts by weight. The main purpose of the metal oxide is to prevent generation of white smoke and silver streak and is preferably 50 parts by weight or less. If the total amount of magnesium hydroxide and / or metal oxide exceeds 150 parts by weight, the acid resistance may decrease.

From the same aspect, in the flame retardant resin composition of the present invention, the total amount of the flame retardant aids (A), (B) and (C) with respect to 100 parts by weight of the synthetic resin is 20 parts by weight or less, Preferably it is 0.5-20 weight part. When the total amount of aluminum salt hydroxide particles and magnesium hydroxide is 100 parts by weight or more, the flame retardant aid is not necessarily used. Addition of more than 20 parts by weight of a flame retardant aid does not particularly improve flame retardancy and mechanical strength, and is also uneconomical.

Although the flame retardant of the present invention can be blended in the resin as it is, it can be used after being treated with a surface treatment agent. Examples of such a surface treatment agent include at least one selected from the group consisting of higher fatty acids, coupling agents, (silane-based, titanate-based, aluminum-based) and alcohol phosphate esters. These surface treatments are performed using a surface treatment agent of 10% by weight or less, preferably 5% by weight or less based on the flame retardant.

In the present invention, the surface of the flame retardant is acid-resistant coated with at least one selected from the group consisting of a silicon compound, a boron compound and an aluminum compound, and if necessary, the higher fatty acids, titanate coupling agent, silane cup By using a surface treatment with at least one surface treatment agent selected from the group consisting of a ring agent, an aluminate coupling agent, and an alcohol phosphate ester, a resin composition having a higher acid resistance can be obtained. .
These surface treatment agents are coated at 2% by weight or less with respect to each of the aluminum salt hydroxide particles and the magnesium hydroxide particles. Similarly, the surface treatment may be applied to the metal oxide.

The aluminum salt hydroxide particles used in the present invention are previously dried at 100 to 320 ° C. before blending with the resin, and when kneading with the resin, a hopper dryer is used to prevent white smoke and silver streak during kneading. It is even more effective.
If it is not pre-dried, the effect of preventing white smoke and silver streak during mixing is low.

In the flame-retardant resin composition of the present invention, there are no particular restrictions on the method of blending, filling, and molding the flame retardant into the synthetic resin, and any means that can uniformly mix, fill, and mold these can be used. This method can also be adopted. For example, the above components and other additives may be mixed in advance, and then melt kneaded with an open roll, a single or twin screw kneading extruder, a Banbury mixer, or the like. There is no special provision in the molding method of the obtained resin composition, and examples thereof include molding methods such as injection molding, extrusion molding, and press molding.
In particular, from the viewpoint of preventing silver streak, the kneading extruder and the molding machine are preferably vented.

The above-mentioned flame retardant resin composition of the present invention is molded at a temperature of 320 ° C. or less, thereby obtaining a flame retardant resin molded product having excellent characteristics in which the object is achieved.

Various additives, reinforcing agents, fillers, polymer alloy compatibilizers and the like that are usually added can be added to the flame-retardant resin composition of the present invention within a range that does not impair the object of the present invention.

Specific examples of the polymer alloy compatibilizer include maleic anhydride-modified styrene-ethylene-butylene resin, maleic anhydride-modified styrene-ethylene-butadiene resin, maleic anhydride-modified polyethylene, maleic anhydride-modified EPR, maleic anhydride-modified. Examples include polypropylene, carboxyl-modified polyethylene, and epoxy-modified polystyrene / PMMA.

That is, the present invention is 1. 5 to 200 parts by weight of an aluminum salt hydroxide particle flame retardant represented by the following formula 1 with respect to 100 parts by weight of a synthetic resin, 5 to 150 parts by weight of magnesium hydroxide particles and 5 to 150 parts by weight of metal oxide particles, and A flame retardant resin composition comprising at least one selected from the following (A), (B), and (C) as a flame retardant aid in an amount of 20 parts by weight or less;
(A) Phosphorus compound (B) Carbon powder (C) Silicone
Wherein M is at least one cation selected from the group consisting of Na ⁺ , K ⁺ , NH ₄ ⁺ , H ₃ O ⁺ and Ca ²⁺ , and M ′ is Zn ²⁺ , Ni ²⁺ , Sn ⁴⁺ , Zr ^At least one metal cation selected from the group consisting of ⁴⁺ and Ti ⁴⁺ , A represents at least one organic acid anion, B represents at least one inorganic acid anion, and a, b, m, n, x, y and z are 0.7 ≦ a ≦ 1.35, 2.7 ≦ b ≦ 3.3, 0 ≦ m ≦ 5, 4 ≦ n ≦ 7, 0 ≦ x ≦ 0.6, 1.7 ≦ y ≦ 2.4, 0 ≦ z ≦ 0.5)
2. The flame retardant resin composition according to item 1, wherein 0.5 to 20 parts by weight of the flame retardant aid is blended with respect to 100 parts by weight of the synthetic resin.
3. The flame retardant resin composition according to item 1 above, wherein the phosphorus compound is at least one selected from the group consisting of red phosphorus, phosphate ester, condensed phosphate ester and polyphosphate,
4). The flame retardant resin composition according to item 1 above, wherein the carbon powder is at least one selected from the group consisting of carbon black, activated carbon and graphite,
5). The flame retardant resin composition according to item 1 above, wherein the silicone is at least one selected from the group consisting of silicone resin, silicone oil, silicone grease, and silicone rubber;
6). The aluminum salt hydroxide particles are treated with at least one surface treatment agent selected from the group consisting of higher fatty acids, titanate coupling agents, silane coupling agents, aluminate coupling agents, and alcohol phosphate esters. The flame retardant resin composition according to item 1,
7). The flame retardant resin composition according to item 1, wherein the synthetic resin is a polyolefin resin, a polystyrene resin, a polyamide resin, or an ABS resin.
8). The flame retardant resin composition according to item 1, wherein the magnesium hydroxide particles have a BET specific surface area of 1 to 30 m ² / g and an average secondary particle size of 0.1 to 5 μm.
9. The flame retardant resin composition according to item 1, wherein the metal oxide particles are magnesium oxide,
It is.

According to the present invention, it is possible to provide a flame retardant resin composition that is excellent in acid resistance and that suppresses the generation of white smoke during kneading and the generation of silver streaks in a molded product.

Hereinafter, the present invention will be described in detail based on examples. The specific surface area by BET method in each example, an average secondary particle diameter, generation | occurrence | production of the white smoke at the time of kneading | mixing, and the measuring method of the silver streak of a molded article are demonstrated below.

(1) Component analysis method Na: Atomic absorption Ca, Al, Ni, Zn and Sn: Chelate analysis NH ₄ , Ti: Colorimetric method SO ₄ , Zr: Gravimetric method H ₂ C ₂ O ₄ , H ₃ C ₆ H ₅ O ₇ , H ₂ C ₄ H ₄ O ₆ : redox method H ₂ O: measured by weight loss after drying at 120 ° C. for 1 hour stearic acid: ether extraction (2) specific surface area by BET method; Yuasa Ionics Co., Ltd. ) Of 12 specimens was measured with Multisorb-12.
(3) Average secondary particle size and particle size distribution sharpness device: Microtrac MT3300 (Leed & Norrup Instruments Company method): 700 mg of sample powder was added to 70 mL of 0.2 wt% sodium hexametaphosphate aqueous solution, and ultrasonic waves (manufactured by NISSEI, After 3 minutes dispersion with MODEL US-300, current 300 μA), 2-4 mL of the dispersion was taken while stirring with a stirrer and added to the sample chamber of the particle size distribution analyzer containing 250 mL of deaerated water, After operating the analyzer and circulating the suspension for 3 minutes, the particle size distribution is measured, a total of two measurements are taken, and the mv obtained for each measurement is taken as the average particle size of the sample.
As an evaluation method of particle size uniformity and monodispersity, the particle diameter is plotted on the horizontal axis, the cumulative frequency is plotted on the vertical axis, and the particle size from the smallest particle size to the cumulative frequency of 25% with respect to the total number of particles. The particle diameter at which D ₂₅ , 75% is D _75, and the ratio D ₇₅ / D _{25 of} these ratios, that is, the particle size distribution sharpness, represents the spread of the particle size distribution.
(4) Acid resistance test: The following aluminum or magnesium elution test was evaluated as an acid resistance test. One 1/8 inch thick UL94 vertical test piece was cut in half length, immersed in 200 mL of 3.6 N sulfuric acid solution, and allowed to stand at 50 ° C. for 7 days for evaluation. The aluminum or magnesium content of the aqueous solution was evaluated by ICP analysis. The smaller the aluminum or magnesium content of the aqueous solution, the better the acid resistance because the elution amount of aluminum or magnesium from the test piece is smaller.
(5) Flame retardancy: Measured by UL94 vertical test and UL94HB method.
(6) Yield point tensile strength; measured according to JIS K7113. However, polypropylene was measured at a test speed of 50 mm / min, and ABS and nylon 6 were measured at a test speed of 5 mm / min.
(7) Generation of white smoke during kneading; Using a biaxial kneading extruder with a vent, the white smoke in the kneading zone and the vent zone was visually observed. No white smoke is indicated by ○, and white smoke is indicated by ×.
(8) Silver streak on the surface of the molded product; A disk having a thickness of 2.1 mm and a diameter of 50 mm was injection-molded at 230 ° C. using an injection molding machine with a vent. The degree of silver streak generated in this disk was visually ranked in the following grades 1-4. Grade 3 or higher is the degree of occurrence of silver streak that causes no problem in appearance, and is preferably grade 2 or higher.
1st grade: No silver streak 2nd grade: Slightly silver streak near the gate 3rd grade: Slight silver streak 4th grade: Remarkable silver streak on the entire surface

Synthesis of flame retardant (Synthesis Example 1)
(1) Synthesis of aluminum salt hydroxide particles 160 mol of aluminum sulfate and 0.2 mol of sodium sulfate were dissolved in 700 L of ion-exchanged water, and 0.1 mol of oxalic acid (H ₂ C ₂ O ₄ ) was added thereto to add 1 m ³ The reaction vessel was stirred. Further, 633 mol of sodium hydroxide was added to the mixed solution while stirring, and hydrothermal treatment was performed at 170 ° C. for 3 hours. The cooled reaction liquid was filtered, washed with water, dried at 120 ° C. and pulverized for 24 hours. As a result, disk-shaped (meteorite) aluminum salt hydroxide particles (hereinafter referred to as flame retardant C) shown in FIG. 1 were obtained. .
(2) 2 kg of the surface-treated flame retardant of aluminum salt hydroxide particles was suspended in 20 L of ion-exchanged water to obtain a slurry.
60 g of sodium stearate was added to the aluminum salt hydroxide particle slurry, stirred at 80 ° C. for 1 hour, filtered, washed with water, dried and pulverized at 120 ° C. for 10 hours. Flame retardants A and B in amounts of 2% and 3% by weight).

Hereinafter, the 13th page, the 23rd line to the 13th page, the 25th line and Examples 1-A to 2-C and Examples 1-A to 2-D of WO2006 / 09847 in the republished patent publication specification WO2005 / 085168. The flame retardants D to K were synthesized based on the method described in 1). However, flame retardant F was prepared by adding flame retardant A to a saturated calcium hydroxide aqueous solution and replacing Na ions with Ca ions while stirring at 60 ° C. for 1 hour.
Flame retardant I was synthesized in the same manner as flame retardant D by using tin sulfate instead of nickel sulfate.
Table 1 shows the characteristics of each flame retardant.

(Resin composition production example 1)
100 parts by weight of impact-grade polypropylene for injection molding, 0.5 parts by weight of antioxidant 1 (trade name: IRGANOX 1010 / Ciba Specialty Chemicals), antioxidant 2 (DLTDP; trade name: DLTP / manufactured by Yoshitomi Pharmaceutical) Compound pellets prepared by adding 0.5 parts by weight and 100 parts by weight of a flame retardant surface-treated with sodium stearate prepared in Synthesis Example 1 and kneading at 200 ° C. using a vented twin screw extruder. Was made.
As the flame retardant, flame retardants A to K prepared in Example 1 were used, and magnesium hydroxide particles used were X, Y and Z shown in Table-1-2.
V and W shown in Table 1-3 were used for the metal oxide particles.
Depending on the production example, red phosphorus (trade name: Nova Excel F5 / manufactured by Rin Chemical Industry Co., Ltd.), carbon black (oil furnace method FEF) and silicone resin powder (trade name: Dow Corning 4-7081 / manufactured by Toray Dow Corning) One or more flame retardant aids selected from
The obtained compound pellets were dried with hot air at 120 ° C. for 5 hours and then injection molded at 230 ° C. using an injection molding machine with a vent to prepare test pieces. Tables 2 and 3 show the silver streak, white smoke, yield point tensile strength, elongation at break, acid resistance, and flame resistance of the test pieces.

(Resin composition production example 2)
Resin composition production example 1 except that injection molding grade ABS resin was used instead of polypropylene, the kneading temperature was changed to 230 ° C., and the drying conditions of the compound pellets were changed to vacuum drying at 70 ° C. for 16 hours. A test piece was prepared in the same manner as described above. Table 4 shows the results of each test.

(Resin composition production example 3)
Resin composition production example 1 except that injection-grade nylon 6 was used instead of polypropylene, the kneading temperature was changed to 230 ° C, and the drying conditions of the compound pellets were changed to vacuum drying at 70 ° C for 16 hours. A test piece was prepared in the same manner as described above. However, antioxidant 3 (trade name: IRGANOX 1098 / Ciba Specialty Chemicals) was used as an antioxidant. Table 4 shows the results of each test.

(Acid resistance test)
In the test pieces manufactured in the above resin composition production examples, the results of sulfuric acid resistance by the above-described method are shown in Tables 2 and 3.
As can be seen from Tables 2 and 3, the molded product produced with the resin composition of the present invention is superior in acid resistance compared to the molded product produced with a conventional resin composition containing only a large amount of magnesium hydroxide particles. .

According to each test result shown in Tables 2-4,
As can be seen from Comparative Example 1, when only aluminum salt hydroxide particles are used as a flame retardant, it does not have a practical flame retardant effect and does not form an embodiment as a flame retardant resin composition. There is also a problem of occurrence of silver streaks in molded products.
As can be seen from Comparative Example 2, when only the flame retardant aids red phosphorus and carbon black are used, there is no practical flame retardant effect and the embodiment as a flame retardant resin composition is not achieved.
As can be seen from Comparative Example 3, when only magnesium hydroxide particles are used as a flame retardant, although there is a practical flame retardant effect, the acid resistance and elongation at break are very low.
(4) On the other hand, in the embodiment of the flame retardant resin composition comprising aluminum salt hydroxide particles, magnesium hydroxide particles and / or metal oxide particles, and 20 parts by weight or less of a flame retardant aid according to the present invention, it is sufficient. While maintaining acid resistance, flame retardant effect, and mechanical strength, there is no problem of white smoke generation at the time of kneading and silver streak generation in the molded product. That is, the problems of acid resistance, flame retardancy, mechanical strength, white smoke generation during kneading, and molded article silver streak are solved in a well-balanced manner.

As described above, the flame-retardant resin composition and molded product of the present invention are excellent in acid resistance, flame retardancy, and mechanical properties, and simultaneously satisfy the prevention of white smoke generation and silver streak generation during kneading. I understood it.

FIG. 1 is an SEM photograph of the disk-shaped aluminum salt hydroxide particles (flame retardant C) of Synthesis Example 1 of the example taken at 20000 times.

Claims (9)

5 to 150 parts by weight of aluminum salt hydroxide particles represented by the following formula 1 with respect to 100 parts by weight of the synthetic resin, 5 to 150 parts by weight of magnesium hydroxide particles and / or metal oxide particles, and (A ), (B) and (C) at least one selected from the group consisting of 20 parts by weight or less as a flame retardant aid.
(A) Phosphorus compound (B) Carbon powder (C) Silicone
Wherein M is at least one cation selected from the group consisting of Na ⁺ , K ⁺ , NH ₄ ⁺ , H ₃ O ⁺ and Ca ²⁺ , and M ′ is Zn ²⁺ , Ni ²⁺ , Sn ⁴⁺ , Zr ^At least one metal cation selected from the group consisting of ⁴⁺ and Ti ⁴⁺ , A represents at least one organic acid anion, B represents at least one inorganic acid anion, and a, b, m, n, x, y and z are 0.7 ≦ a ≦ 1.35, 2.7 ≦ b ≦ 3.3, 0 ≦ m ≦ 5, 4 ≦ n ≦ 7, 0 ≦ x ≦ 0.6, 1.7 ≦ y ≦ 2.4, 0 ≦ z ≦ 0.5) The flame retardant resin composition according to claim 1, wherein 0.5 to 20 parts by weight of at least one selected from the above (A), (B) and (C) is contained as a flame retardant aid. The flame-retardant resin composition according to claim 1. The flame retardant resin composition according to claim 1, wherein the phosphorus compound is at least one selected from the group consisting of red phosphorus, phosphate ester, condensed phosphate ester and polyphosphate. The flame retardant resin composition according to claim 1, wherein the carbon powder is at least one selected from the group consisting of carbon black, activated carbon, and graphite. The flame retardant resin composition according to claim 1, wherein the silicone is at least one selected from the group consisting of silicone resin, silicone oil, silicone grease, and silicone rubber. The aluminum salt hydroxide particles are treated with at least one surface treatment agent selected from the group consisting of higher fatty acids, titanate coupling agents, silane coupling agents, aluminate coupling agents, and alcohol phosphate esters. The flame-retardant resin composition according to claim 1. The flame retardant resin composition according to claim 1, wherein the synthetic resin is a polyolefin resin, a polystyrene resin, or a polyamide resin. 2. The flame retardant resin composition according to claim 1, wherein the magnesium hydroxide particles have a BET specific surface area of 1 to 30 m ² / g and an average secondary particle diameter of 0.1 to 5 μm. The flame retardant resin composition according to claim 1, wherein the metal oxide particles are magnesium oxide particles.