JP2940320B2 - Composition for automotive relay box and automotive relay box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composition suitable for a material for an automotive relay box and an automotive relay box.

[0002]

2. Description of the Related Art In recent years, automobiles have become more and more electronic and electric components are often used. Many plastic materials are used in these electrical components for the purpose of reducing the weight and simplifying the process. Above all, as a material for a relay box, heat resistance, solvent resistance and mechanical strength are required, and fluidity and dimensional stability for forming a complicated shape with high dimensional accuracy are also required. 6,6-nylon is widely used as a material satisfying these requirements. 6,6-Nylon is a crystalline engineering plastic which is excellent in fluidity, heat resistance and solvent resistance, but has a drawback that physical properties are reduced and dimensional changes are caused by water absorption. In addition, there is a defect that cracks are generated by calcium chloride sprayed as a deicing agent in winter.

[0003] Further, the need for reducing the weight of automobiles is increasing, and there is a strong demand for materials which are lightweight and satisfy the performance as an automobile relay box. It is known to blend polyphenylene ether to improve the above-mentioned disadvantages of 6,6-nylon (Japanese Patent Publication No. 59-41663). However, when a material composed of 6,6-nylon and polyphenylene ether is used for an automobile relay box, although the physical properties and dimensional change due to water absorption are improved, the formability is reduced and the relay box having a complicated shape is required. However, there is a drawback that the fluidity and the releasability are not sufficient and the weld strength is low. Further, the resin composition of 6,6-nylon and polyphenylene ether is not sufficient in terms of recyclability required for recent automobiles. Various characteristics required for automotive relay boxes,
That is, heat resistance, solvent resistance, mechanical strength, weld strength,
There has been a strong demand for a lightweight material that satisfies moldability (particularly fluidity and mold release properties), weather resistance and recyclability, and is lightweight.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a relay box for an automobile and a material satisfying the above-mentioned characteristics for solving the above-mentioned problems in molding the same.

[0005]

Means for Solving the Problems To solve the above problems, the present inventors have made intensive studies and have found that a composition comprising a modified polyphenylene ether, 6,6-nylon, 6-nylon, polypropylene, and a metal salt of montanic acid. Have completed the present invention based on the finding that the above properties as a material for an automobile relay box are satisfied. That is, the present invention relates to a polyphenylene ether modified with (A) an unsaturated carboxylic acid having simultaneously a) an ethylenic double bond and b) a carboxyl group or an acid anhydride group.
~ 70% by weight and (B) 6,6-nylon 100
(C) a modified polyphenylene ether in the mixture comprising 30 to 80% by weight of a polyamide in which 10 to 100 parts by weight of 6-nylon is blended with respect to 10 parts by weight;
100 to 100 parts by weight of polypropylene 5 to 70 parts by weight,
And (D) a composition suitable for a material for an automotive relay box, wherein 0.1 to 3 parts by weight of a metal montanate is mixed with 100 parts by weight of the mixture, and an automobile obtained by molding the composition. The relay box is the gist. Hereinafter, the present invention will be described in detail.

The polyphenylene ether used in the resin composition of the present invention is represented by the general formula (I):

[0007]

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Wherein R ₁ is a lower alkyl group having 1 to 3 carbon atoms, and R ₂ and R ₃ are a hydrogen atom or a lower alkyl group having 1 to 3 carbon atoms. A polyphenylene ether obtained by polycondensing one or more kinds. The “polyphenylene ether” also includes a graft copolymer obtained by graft-polymerizing a vinyl aromatic compound to the above-mentioned polyphenylene ether and having a polyphenylene ether as a trunk. Polyphenylene ether is
It may be a homopolymer or a copolymer.

The monocyclic phenol represented by the general formula (I) includes, for example, 2,6-dimethylphenol,
2,6-diethylphenol, 2,6-dipropylphenol, 2-methyl-6-ethylphenol, 2-methyl-6-propylphenol, 2-ethyl-6-propylphenol, o-cresol, 2,3- Dimethylphenol, 2,3-diethylphenol, 2,3-dipropylphenol, 2-methyl-3-ethylphenol, 2-methyl-3-propylphenol, 2-ethyl-3-methylphenol, 2-ethyl-3 -Propylphenol,
2-propyl-3-methylphenol, 2-propyl-
3-ethylphenol, 2,3,6-trimethylphenol, 2,3,6-triethylphenol, 2,3,6-tripropylphenol, 2,6-dimethyl-3-ethylphenol, 2,6-dimethyl- 3-propylphenol and the like.

The polyphenylene ethers obtained by polycondensation of one or more of these phenols include, for example, poly (2,6-dimethyl-1,4-phenylene) ether, poly (2,6-diethyl-1, 4-phenylene) ether, poly (2,6-dipropyl-1,4-phenylene) ether, poly (2-methyl-6-ethyl-1,4
-Phenylene) ether, poly (2-methyl-6-propyl-1,4-phenylene) ether, poly (2-ethyl-
6-propyl-1,4-phenylene) ether, 2,6-
Dimethylphenol / 2,3,6-trimethylphenol copolymer, 2,6-dimethylphenol / 2,3,6-triethylphenol copolymer, 2,6-diethylphenol / 2,3,6-trimethylphenol copolymer Polymer, 2,
6-dipropylphenol / 2,3,6-trimethylphenol copolymer, graft copolymer obtained by graft-polymerizing styrene to poly (2,6-dimethyl-1,4-phenylene) ether, 2,6-trimethylphenol A graft copolymer in which styrene is graft-polymerized to the copolymer is exemplified. In particular, poly (2,6-dimethyl-1,4-phenylene) ether, 2,6-dimethylphenol / 2,3,6-
Trimethylphenol copolymer is preferred as the polyphenylene ether used in the present invention. As the above polyphenylene ether, those having an intrinsic viscosity in chloroform at 25 ° C. of 0.1 to 0.7 dl / g are generally used, and those having a limiting viscosity of 0.3 to 0.6 dl / g are preferable. If the intrinsic viscosity of polyphenylene ether is less than 0.1 dl / g, the obtained resin composition becomes brittle, and if it exceeds 0.7 dl / g, the fluidity of the obtained resin composition becomes poor.

Next, the modifying agent used for modifying the polyphenylene ether contains (a) an ethylenic double bond and (b)
Organic compounds having a carboxyl group or an acid anhydride group at the same time. Examples of organic compounds having an ethylenic double bond and a carboxyl group in one molecule include α, β
-Unsaturated dicarboxylic acids, α, β-unsaturated monocarboxylic acids and the like. Specifically, examples of the α, β-unsaturated dicarboxylic acid include maleic acid, chloromaleic acid, fumaric acid, citraconic acid, itaconic acid and the like. Examples of the α, β-unsaturated monocarboxylic acid include acrylic acid, butenoic acid, crotonic acid, vinyl acetic acid, methacrylic acid, pentenoic acid, angelic acid and the like. Further, as an organic compound having both an ethylenic double bond and an acid anhydride group in the molecule,
For example, acid anhydrides of the above α, β-unsaturated dicarboxylic acids and α, β-unsaturated monocarboxylic acids can be mentioned. Among these, preferred are maleic acid, fumaric acid, acrylic acid, methacrylic acid, and maleic anhydride, and more preferred is maleic anhydride. The above-mentioned unsaturated dicarboxylic acid, unsaturated monocarboxylic acid,
Alternatively, the acid anhydrides can be used alone or in combination.

These modifiers are used in an amount of 0.01 to 10 parts by weight, preferably 0.1 to 3 parts by weight, based on 100 parts by weight of the polyphenylene ether. If the ratio is outside the above range, the compatibility between polyphenylene ether and nylon becomes poor, and the resulting resin composition becomes brittle, which is not preferable.

The modified polyphenylene ether used in the present invention is prepared by the following method, but is not particularly limited thereto. For example, the modified polyphenylene ether is prepared by melt-kneading the above-mentioned ratio of polyphenylene ether and the modifier at a temperature of 150 to 350 ° C. for 0.1 to 10 minutes using a roll mill, a Banbury mixer, an extruder, and the like, and reacting. And the above ratio of polyphenylene ether and modifier in a solvent exemplified by benzene, toluene, xylene and the like at a temperature of 50 to 150 ° C. and a temperature of 10 to 500.
It may be prepared by heating and reacting for minutes. In order to facilitate the denaturation reaction, the reaction system is preferably made of an organic peroxide such as benzoyl peroxide, di-t-butyl peroxide, dicumyl peroxide, t-butyl peroxybenzoate, or azobisisobutyro. It is also possible to allow a radical initiator represented by an azo compound exemplified by nitrile, azobisisovaleronitrile and the like to be present.

Next, 6,6-nylon which is one of the polyamide components (B) used in the present invention means a polymer having a --CONH-- group in the repeating unit structure, and is usually represented by the following formula: H ₂ N - (CH ₂₎ hexamethylene diamine represented by ₆ -NH _2, the following formula: HOOC- (CH ₂₎ adipic acid represented by ₄ -COOH or the following _{formula,: ROOC- (CH 2) 4} -COOR ( wherein Wherein R represents a methyl, ethyl, propyl, phenyl group or the like.) Or by condensation with the above-mentioned adipic acid and the following formula: OCN- (CH ₂ ) ₆ -NCO Obtained by condensation with a diisocyanate. As the above 6,6-nylon, in 98% sulfuric acid,
Relative viscosity at a concentration of 0.25g / 100ml and temperature of 25 ° C
η _r = 2.2 to 3.2 are generally used. In particular, η _r =
Those having 2.4 to 3.0 are preferred. The above relative viscosity is 2.
If it is less than 2, the strength of the molded article obtained from the resin composition will be low, and if it exceeds 3.2, the moldability of the obtained resin composition will be poor, which is not preferable.

The other 6-nylon is obtained by ring-opening polymerization of ε-caprolactam.
A substance having a relative viscosity of η _r = 2.2 to 3.2 in sulfuric acid at a concentration of 0.25 g / 100 ml and a temperature of 25 ° C. is generally used,
In particular, those having η _r = 2.3 to 3.0 are preferred. If the above relative viscosity is less than 2.2, the strength and heat resistance of a molded article obtained from the resin composition will be low. On the other hand, if it exceeds 3.2, the molding processability of the obtained resin composition is deteriorated, and there is no effect of improving the appearance of the weld portion, which is not preferable.

6,6-polyamide in the polyamide component (B)
As for the ratio of nylon and 6-nylon, 6-nylon is blended in 10 to 100 parts by weight, preferably 20 to 80 parts by weight, based on 100 parts by weight of 6,6-nylon. When the amount of 6-nylon is less than 10 parts by weight, there is almost no effect of improving the moldability and weld appearance, and when it is more than 100 parts by weight, the heat resistance of the molded article obtained from the resin composition decreases, which is preferable. Absent. The ratio of the modified polyphenylene ether component (A) to the polyamide component (B) is A: B = 20 to 70% by weight: 80 to 30% by weight, preferably 30 to 60% by weight: 70 to 40% by weight.
The proportion of A is less than 20% by weight, so that the proportion of B
If it exceeds 0% by weight, the mechanical strength, heat resistance and solvent resistance decrease, and if the proportion of A exceeds 70% by weight, and if the proportion of B is less than 30% by weight, the moldability (especially Releasability)
And the weld strength is also reduced.

The polypropylene as the component (C) used in the resin composition of the present invention may be a propylene homopolymer, an ethylene-propylene copolymer, a propylene
It is an ethylene-α-olefin copolymer and has an MFR (23
(0 ° C 2.16 kg) is preferably 1 to 100. The polypropylene is added in an amount of 5 to 70 parts by weight, preferably 7 to 65 parts by weight, based on 100 parts by weight of the modified polyphenylene ether. If the amount is less than 5 parts by weight, the effect of reducing the weight is not improved, and if it exceeds 70 parts by weight, the physical properties of the obtained molded article are undesirably reduced.

The metal salt of montanic acid, which is the component (D) used in the resin composition of the present invention, includes sodium montanate, potassium montanate, lithium montanate, calcium montanate, zinc montanate, barium montanate. And aluminum montanate. Among them, sodium montanate is preferred from the viewpoints of effects and industrial availability. The metal salt of montanic acid is 0.1 to 3 parts by weight, preferably 0.2 to 1 part by weight, based on 100 parts by weight of the modified polyphenylene (component (A)) and polyamide (component (B)). Add. If the amount is less than 0.1 part by weight, there is no effect of improving the releasability.

It is a preferred embodiment to add an elastomer when obtaining the resin composition of the present invention. This elastomer is an elastomer in a general sense. V. “Properties and Struct” by Tobolsky
ures of Polymers "(John Willy & Sons, In
c. The definition adopted on pages 71 to 78 can be cited, and an elastomer has a Young's modulus of 10 at room temperature.
5 to 109 dynes / cm2 (0.1 to 1,020 kg / cm2). Specific examples of the elastomer include a styrene-butadiene random copolymer, a styrene-butadiene block copolymer, a styrene-isoprene block copolymer, and a styrene-butadiene block copolymer in which a double bond in a polybutadiene portion is hydrogenated. Styrene-isoprene triblock copolymer in which the double bond of polyisoprene is hydrogenated, nitrile rubber,
Examples include ethylene-propylene copolymer, ethylene-propylene-diene copolymer (EPDM), thiocol rubber, polysulfide rubber, acrylic rubber, polyurethane rubber, grafted product of butyl rubber and polyethylene, polyester elastomer, polyamide elastomer and the like. In particular, an ABA′-type triblock copolymer is desirable. The terminal blocks A and A ′ of this block copolymer are polymerized vinyl aromatic hydrocarbon blocks, and B is a polymerized conjugated diene block or a conjugated diene block in which most of the double bonds are hydrogenated. Yes, it is desirable that the molecular weight of the B block be greater than the combined molecular weight of the A and A 'blocks. The terminal blocks A and A ′ may be the same or different, and the block is a thermoplastic homopolymer or copolymer derived from a vinyl aromatic compound in which the aromatic portion may be monocyclic or polycyclic. . Examples of such vinyl aromatic compounds include styrene, α-methylstyrene, vinyl toluene, vinyl xylene, ethyl vinyl xylene, vinyl naphthalene, and mixtures thereof. The central block B is an elastomeric polymer derived from conjugated diene hydrocarbons, such as 1,3-butadiene, 2,3-dimethylbutadiene, isoprene and 1,3-pentadiene and mixtures thereof, or a double bond. Most are hydrogenated. The molecular weight of each end block A and A 'is preferably from about 5,000 to about 50,000.
The molecular weight of the central block B is preferably in the range of about 25,000 to about 1,500,000. The elastomer is modified polyphenylene ether 10
2 to 50 parts by weight, preferably 5 to 40 parts by weight per 0 parts by weight
Add parts by weight. The tensile elongation at break can be increased by adding an elastomer, but if the amount exceeds 50 parts by weight based on 100 parts by weight of the modified polyphenylene ether, the tensile yield strength decreases.

In the resin composition of the present invention, if desired,
Other resins, flame retardants, flame retardant aids, stabilizers, UV absorbers,
Various additives such as plasticizers and lubricants, pigments, fillers, and other components can be appropriately compounded. Examples of other resins include polystyrene resins, epoxy resins, polycarbonate resins, polyester resins, polyphenylene sulfide, and the like.

In order to obtain the resin composition of the present invention from each component, it is general to melt and mix each component after mixing. The temperature of the melt mixing at that time is 230 to 370 ° C, preferably 250 to 320 ° C. The melt mixing method is performed using an extruder, a kneader, a Banbury mixer, a roll, and the like.

In order to manufacture a relay box for an automobile from the resin composition of the present invention, a method using an injection molding machine is generally used. The resin composition of the present invention is pelletized and, using an injection molding machine, a cylinder temperature of 250 to 320 ° C, a mold temperature of 40 to 120 ° C, and a molding pressure of 500 to 2,000 kg / cm ^2.
Injection molding is performed under the conditions described above to produce an automotive relay box. FIG. 1 shows an embodiment of an automotive relay box according to the present invention.

[0023]

EXAMPLES Next, in order to more specifically explain the present invention, a preparation example of a modified polyphenylene ether will be shown as a reference example, and preparation of a resin composition of the present invention, production of a relay box, and performance will be described. Illustrated by example. Of course, the present invention is not limited by these examples.

Reference Example 1 A 2,6-dimethylphenol polymer having an intrinsic viscosity of 0.45 (dl / g) measured in chloroform at 25 ° C.
To 1.86 kg, 450 g of Kraton G1651 (manufactured by Shell Chemical: hydrogenated styrene-butadiene-styrene type elastomer), 1.14 kg of K-1014 (manufactured by Chisso: polypropylene) and 24 g of maleic anhydride were added and mixed with a Henschel mixer. After that, it is melted and kneaded at a temperature of 280 to 320 ° C. for about 2 minutes with a twin screw extruder,
Pelletization provided a mixture containing maleic anhydride modified polyphenylene ether.

Comparative Reference Example 1 2,6-dimethylphenol polymer used in Reference Example 1
1.50kg Clayton G1651 450g and K-
After adding 1.50 kg of 1014 and 24 g of maleic anhydride and mixing with a Henschel mixer, the mixture was melt-kneaded with a twin screw extruder at a temperature of 280 to 320 ° C. for about 2 minutes,
Pelletization provided a mixture containing maleic anhydride modified polyphenylene ether.

Comparative Reference Example 2 2,6-dimethylphenol polymer used in Reference Example 1
To 3.00 kg, 450 g of Clayton G1651 and 24 g of maleic anhydride were added, mixed by a Henschel mixer, melt-kneaded at a temperature of 300 to 320 ° C. for about 2 minutes by a twin screw extruder, pelletized, and pelletized with maleic anhydride. A mixture containing the modified polyphenylene ether was obtained.

Examples 1 to 6 and Comparative Examples 1 to 5 Maleic anhydride-modified polyphenylene ether pellets obtained in Reference Example 1 (60 parts by weight, 6,6 parts by weight)
-Nylon (Toray: Amilan CM-3007-
N, in 98% sulfuric acid, concentration 0.25 g / dl, relative viscosity at a temperature of 25 ° C; η _r = 2.70) 28 parts by weight, 6-nylon (manufactured by Toray Industries: Amilan CM-1017, in 98% sulfuric acid) concentration 0.25 g / dl, the relative viscosity at a temperature 25 ° C.; eta _r
= 2.65) After mixing 12 parts by weight and the additives shown in Table 1, the mixture was melt-kneaded at 240 to 300 ° C by a twin-screw extruder to form pellets. The pellet was injection molded under the conditions described below to prepare a test piece for measuring physical properties and an automobile relay box.

Comparative Example 6 40 parts by weight of a pellet containing the maleic anhydride-modified polyphenylene ether obtained in Comparative Reference Example 2,
6,6-nylon (Amilan CM-300 manufactured by Toray Industries, Inc.)
7-N) 40 parts by weight, 20 parts by weight of 6-nylon (manufactured by Toray Industries: Amilan CM-1017), and 0.5 part by weight of sodium montanate are mixed and then melted at 240 to 300 ° C. by a twin screw extruder. The mixture was kneaded and formed into pellets. The pellet was injection molded under the conditions described below to prepare a test piece for measuring physical properties and an automobile relay box.

Example 7 Maleic anhydride-modified polyphenylene ether pellets obtained in Reference Example 1 (60 parts by weight, 6,6 parts by weight)
-Nylon (Toray: Amilan CM-3007-N)
32 parts by weight, 6-nylon (Amilan C manufactured by Toray Industries, Inc.)
M-1017) 8 parts by weight, and sodium montanate
After mixing 0.5 parts by weight, 240-
Melt kneading was performed at 300 ° C. to form pellets. The pellets were injection molded under the following conditions to prepare test pieces for measuring physical properties and a relay box for automobiles.

Example 8 Maleic anhydride-modified polyphenylene ether pellets obtained in Reference Example 1 (60 parts by weight, 6,6 parts by weight)
-Nylon (Toray: Amilan CM-3007-
N) 24 parts by weight, 16 parts by weight of 6-nylon (manufactured by Toray Industries: Amilan CM-1017), and 0.5 part by weight of sodium montanate were mixed and then melt-kneaded at 240 to 300 ° C. by a twin screw extruder. And pelletized. The pellets were injection molded under the following conditions to prepare test pieces for measuring physical properties and a relay box for automobiles.

Comparative Example 7 Maleic anhydride-modified polyphenylene ether pellets obtained in Reference Example 1 (60 parts by weight, 6,6 parts by weight)
-Nylon (Toray: Amilan CM-3007-
N) 10 parts by weight, 30 parts by weight of 6-nylon (manufactured by Toray Industries: Amilan CM-1017), and 0.5 part by weight of sodium montanate were mixed, and then melt-kneaded at 240 to 300 ° C. using a twin screw extruder. And pelletized. The pellets were injection molded under the following conditions to prepare test pieces for measuring physical properties and a relay box for automobiles.

Comparative Example 8 Maleic anhydride-modified polyphenylene ether pellets obtained in Reference Example 1 (60 parts by weight, 6,6 parts by weight)
-Nylon (Toray: Amilan CM-3007-
N) 38 parts by weight, 2 parts by weight of 6-nylon (manufactured by Toray Industries: Amilan CM-1017) and 0.5 part by weight of sodium montanate are mixed, and then melt-kneaded at 240 to 300 ° C. by a twin screw extruder. Pelletized. The pellets were injection molded under the following conditions to prepare test pieces for measuring physical properties. An attempt was made to mold a relay box for an automobile, but the flowability of the resin was poor, and a relay box could not be obtained.

Comparative Example 9 60 parts by weight of pellets containing the polyphenylene ether modified with maleic anhydride obtained in Reference Example 1,
-Nylon (Toray: Amilan CM-3007-
N) 28 parts by weight, 6-nylon (Ube Industries, Ltd .: UB
E nylon 1011FB, 98% sulfuric acid, concentration 0.2
5 g / dl, relative viscosity at 25 ° C .; η _r = 2.10)
After mixing 12 parts by weight and 0.5 part by weight of sodium montanate, the mixture was melt-kneaded at 240 to 300 ° C. using a twin-screw extruder to form pellets. The pellets were injection molded under the following conditions to prepare test pieces for measuring physical properties and automobile relay boxes.

Comparative Example 10 60 parts by weight of a pellet containing the polyphenylene ether modified with maleic anhydride obtained in Comparative Reference Example 1,
6,6-nylon (Amilan CM-300 manufactured by Toray Industries, Inc.)
7-N) 28 parts by weight, 12 parts by weight of 6-nylon (manufactured by Toray Industries: Amilan CM-1017), and 0.5 part by weight of sodium montanate are mixed, and then melted at 240 to 300 ° C. by a twin screw extruder. The mixture was kneaded and formed into pellets. The pellets were injection molded under the following conditions to prepare test pieces for measuring physical properties and a relay box for automobiles.

Performance Evaluation The following various physical properties were measured using the test pieces and the automobile relay box obtained as described above.

(1) Release Property Cylinder temperature 280 ° C., mold temperature 80 ° C., molding pressure 80
Under a condition of 0 kg / cm ² , a box-shaped molded product was injection-molded, the resistance value when the molded product was ejected was measured, and the releasability was evaluated. Table 1 shows the results.

(2) Tensile yield strength Tensile rupture elongation Cylinder temperature 280 ° C., mold temperature 80 ° C., molding pressure 1,
Under a condition of 000 kg / cm ^2, a 1/8 inch thick dumbbell piece for tensile test was injection-molded, and the tensile yield strength and tensile elongation at break of the obtained test piece were measured by the method of ASTM D-638. The results are shown in Tables 1 and 2. Also, under the same conditions as above, a 1/8 inch thick dumbbell piece having a weld portion (hereinafter referred to as a weld dumbbell piece) is injection-molded.
The weld depth of the obtained weld dumbbell pieces was measured, and the tensile yield strength and tensile elongation at break were measured.
Table 2 shows the results.

(3) Lance strength Cylinder temperature 290 ° C., mold temperature 50 ° C., molding pressure 1,
The relay box shown in FIG. 2 was injection-molded under the condition of 000 kg / cm ² . The lance strength was measured by inserting a metal terminal into the lance inside the terminal insertion port of the relay box and performing a tensile test. In addition, 120 ° C
Also, the lance strength was measured for the relay box heat-treated at 150 ° C. for 1000 hours. Table 3 shows the results.

(4) Thermal aging test The dumbbell piece for the tensile test of (2) was heated at 120 ° C. and 160 ° C.
The tensile yield strength and tensile elongation at break after each holding in a hot air dryer at a predetermined temperature for a predetermined time were measured to evaluate heat resistance. Table 4 shows the results.

(5) Weather Resistance Test The dumbbell piece for the tensile test of (2) was subjected to a weather resistance test for 1000 hours using a sunshine weatherometer.
The weatherometer black panel temperature was 60 ° C. and the rain cycle was 18 minutes / 120 minutes. After the test, while measuring the color change (ΔE) and observing the appearance with an optical microscope, the tensile strength and the elongation at break were measured to evaluate the weather resistance. Table 5 shows the results.

(6) Reusability test Cylinder temperature 280 ° C, mold temperature 80 ° C, molding pressure 1,
Under a condition of 000 kg / cm ² , a 1/8 inch thick dumbbell piece for a tensile test was injection-molded, crushed, and a similar dumbbell piece was injection-molded again under the same conditions. This is called once playback,
Thereafter, this operation was repeated up to 10 times. The reusability was evaluated by measuring the tensile strength and elongation at break of the test dumbbell piece for each molding. Table 6 shows the results.

[0042]

[Table 1]

[0043]

[Table 2]

[0044]

[Table 3]

[0045]

[Table 4]

[0046]

[Table 5]

[0047]

[Table 6]

[0048]

As described above, the resin composition of the present invention has excellent moldability (particularly fluidity and mold release properties), and the relay box for automobiles molded from the resin composition has heat resistance and mechanical properties. Satisfies the requirements for mechanical strength, weld strength, weather resistance, solvent resistance, and reusability. Further, since the automotive relay box of the present invention is manufactured from a lightweight composition, it is not only lighter than the conventional relay box, but also simplifies the manufacturing process because there is no need for moisture absorption treatment or the like. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view of an automotive relay box according to an embodiment of the present invention.

FIG. 2 is a plan view of an automotive relay box used for performance evaluation.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02G 3/16 H02G 3/16 A

Claims (3)

(57) [Claims] 1. A polyphenylene ether modified with (A) a) an ethylenic double bond and b) an unsaturated carboxylic acid having a carboxyl group or an acid anhydride group at the same time.
70% by weight and 100 parts by weight of (B) 6,6-nylon
6-nylon having a relative viscosity of 2.2 or more at a concentration of 0.25 g / 100 ml in 25% sulfuric acid at a temperature of 25 ° C.
(C) a modified polyphenylene ether in the mixture of 30 to 80% by weight of the blended polyamide;
A relay box for automobiles, comprising: 5 to 70 parts by weight of polypropylene with respect to 0 parts by weight; and (D) 0.1 to 3 parts by weight of a metal montanate based on 100 parts by weight of the mixture. Composition. 2. The composition for an automotive relay box according to claim 1, further comprising 2 to 50 parts by weight of an elastomer based on 100 parts by weight of the modified polyphenylene ether in the mixture. 3. An automotive relay box comprising the composition of claim 1.