JPH06141443A - Composition for automobile relay box and relay box for automobile - Google Patents

Abstract

PURPOSE:To make a relay box, for an automobile lightweight and to enhance the heat-resistant property, the solvent-resistant property, the mechanical strength and the molding property of the relay box for the car, by a method wherein the relay box for the car is formed of a resin composition composed of polyphenylene ether, 6, 6-nylon, 6-nylon, polypropylene and a montanic acid metal salt whose ratio its specific and which have been denatured. CONSTITUTION:A mixture composed of 20 to 70wt.% of polyphenylene ether which has been denatured by unsaturated carboxylic acids provided simultaneously with an ethylene dounble bond and a carboxylic group or an acid anhydride group and of 30 to 80wt.% of a polyamide in which 10 to 100 pts.wt. of 6-nylon has been mixed with 100 pts.wt. of 6,6-nylon is obtained. Then, 5 to 70 pts.wt. of polypropylene with reference to 100 pts.wt. of denatured polyphenylene ether in the mixture and 0.1 to 3 pts.wt. of a montanic acid metal salt with reference to 100 pts.wt. of the mixture are mixed with the mixture, and a resin composition for a relay box for an automobile is obtained. Thereby, the heat-resistant property, the solvent-resistant property, the mechanical strength, the molding property, the weatherability and the recycling property of the resin composition can be enhanced.

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 an automobile relay box material and an automobile relay box.

[0002]

2. Description of the Related Art In recent years, automobiles are becoming more electronic, and many electrical components are used. A large number of plastic materials are used for these electrical components for the purpose of weight reduction and simplification of the process. Above all, the material for the relay box is required to have heat resistance, solvent resistance, and mechanical strength, and also fluidity and dimensional stability for forming a complicated shape with dimensional accuracy. As a material satisfying these requirements, 6,6-nylon is widely used. 6,6-Nylon is a crystalline engineering plastic and is a material having excellent fluidity, heat resistance, and solvent resistance, but it has the drawback that physical properties decrease and dimensional change due to water absorption. Further, it has a defect that cracks occur due to calcium chloride sprayed as an antifreezing agent in winter.

Further, the need for weight reduction of automobiles is becoming stronger and stronger, and there is a strong demand for materials that are lightweight and satisfy the performance of automobile relay boxes. It is known to blend polyphenylene ether to improve the above-mentioned drawbacks of 6,6-nylon (Japanese Patent Publication No. 59-41663). However, when a material consisting of 6,6-nylon and polyphenylene ether is used in an automobile relay box, the physical properties and dimension change due to water absorption are improved, but the moldability is reduced and the relay box with a complicated shape is used. However, they have the drawbacks of insufficient fluidity and releasability and low weld strength. Further, in terms of recyclability required for automobiles in recent years, a resin composition of 6,6-nylon and polyphenylene ether is insufficient. Various characteristics required for automobile 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 releasability), weather resistance, and recyclability.

[0004]

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

[0005]

Means for Solving the Problems As a result of intensive studies by the present inventors in order to solve the above problems, a composition comprising a modified polyphenylene ether and 6,6-nylon, 6-nylon, polypropylene, a metal salt of montanic acid However, the present invention has been completed based on the finding that the above properties as a material for automobile relay boxes are satisfied. That is, the present invention provides a polyphenylene ether modified by an unsaturated carboxylic acid having (A) a) an ethylenic double bond and b) a carboxyl group or an acid anhydride group at the same time.
Up to 70% by weight, and (B) 6,6-nylon 100
30 to 80% by weight of polyamide in which 10 to 100 parts by weight of 6-nylon is blended with respect to 1 part by weight, and (C) the modified polyphenylene ether in the mixture.
5 to 70 parts by weight of polypropylene per 100 parts by weight,
And (D) a composition comprising 0.1 to 3 parts by weight of a metal salt of montanic acid based on 100 parts by weight of the mixture, which is suitable as a material for a relay box for an automobile, and an automobile formed by molding the composition. The main point is the relay box. The present invention will be described in detail below.

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

[0007]

[Chemical 1]

(Wherein R ₁ is a lower alkyl group having 1 to 3 carbon atoms, R ₂ and R ₃ are hydrogen atoms or a lower alkyl group having 1 to 3 carbon atoms). It is 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 on the above-mentioned polyphenylene ether and having a polyphenylene ether in the trunk. Polyphenylene ether is
It may be a homopolymer or a copolymer.

Examples of the monocyclic phenol represented by the general formula (I) include 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- Examples include 3-propylphenol and the like.

The polyphenylene ether obtained by polycondensation of one or more of these phenols is, for example, poly (2,6-dimethyl-1,4-phenylene) ether or 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 obtained by graft-polymerizing styrene to the copolymer can be used. In particular, poly (2,6-dimethyl-1,4-phenylene) ether, 2,6-dimethylphenol / 2,3,6-
Trimethylphenol copolymer is the preferred 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 an intrinsic viscosity of 0.3 to 0.6 dl / g are preferable. If the intrinsic viscosity of the polyphenylene ether is less than 0.1 dl / g, the resin composition obtained will be brittle, and if it exceeds 0.7 dl / g, the fluidity of the resin composition obtained will be poor.

Next, the modifier used for modifying the polyphenylene ether is (a) an ethylenic double bond and (b) in the molecule.
It is an organic compound that simultaneously has a carboxyl group or an acid anhydride group. Examples of the organic compound having an ethylenic double bond and a carboxyl group in one molecule include α and β.
-Unsaturated dicarboxylic acids, α, β-unsaturated monocarboxylic acids and the like. Specific 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, vinylacetic acid, methacrylic acid, pentenoic acid, angelic acid and the like. Further, as the organic compound having an ethylenic double bond and an acid anhydride group at the same time in the molecule,
Examples thereof include acid anhydrides of the above α, β-unsaturated dicarboxylic acids and α, β-unsaturated monocarboxylic acids. Among these, preferred are maleic acid, fumaric acid, acrylic acid, methacrylic acid and maleic anhydride, and more preferred are maleic anhydride. The above-mentioned unsaturated dicarboxylic acid, unsaturated monocarboxylic acid,
Alternatively, the acid anhydride may 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 above polyphenylene ether. When the amount is out of the above range, the compatibility between the 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 obtained by melt-kneading the polyphenylene ether in the above proportion and the modifier with a roll mill, a Banbury mixer, an extruder or the like at a temperature of 150 to 350 ° C. for 0.1 to 10 minutes to react them. Alternatively, the polyphenylene ether and the modifier in the above proportions in a solvent exemplified by benzene, toluene, xylene and the like at a temperature of 50 to 150 ° C. for 10 to 500.
It may be prepared by heating and reacting for a minute. In order to facilitate the modification reaction, the reaction system may include organic peroxides such as benzoyl peroxide, di-t-butyl peroxide, dicumyl peroxide, t-butyl peroxybenzoate and azobisisobutyroate. It is also possible to allow a radical initiator typified by an azo compound exemplified by nitrile and azobisisovaleronitril 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 usually has 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 R represents a methyl, ethyl, propyl, phenyl group, etc.) or by the above-mentioned adipic acid and the following formula: OCN- (CH ₂ ) ₆ -NCO Obtained by condensation with diisocyanate. As the above 6,6-nylon, in 98% sulfuric acid,
Relative viscosity at a concentration of 0.25g / 100ml and temperature of 25 ℃
Those having η _r = 2.2 to 3.2 are generally used, and particularly η _r =
Those of 2.4 to 3.0 are preferable. 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 molding processability of the resin composition obtained will be poor, such being undesirable.

The other 6-nylon is obtained by ring-opening polymerization of ε-caprolactam and has a content of 98%.
In sulfuric acid, a concentration of 0.25 g / 100 ml and a relative viscosity at a temperature of 25 ° C. η _r = 2.2 to 3.2 are generally used,
It is particularly preferable that η _r = 2.3 to 3.0. If the relative viscosity is less than 2.2, the strength and heat resistance of the molded product obtained from the resin composition will be low. Further, when it exceeds 3.2, the moldability of the obtained resin composition is deteriorated, and there is no effect of improving the appearance of the welded portion, which is not preferable.

6,6 in the polyamide component (B)
The ratio of nylon to 6-nylon is 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 compounding amount of 6-nylon is 10 parts by weight or less, there is almost no effect of improving molding processability and weld appearance, and when it is more than 100 parts by weight, the heat resistance of the molded product obtained from the resin composition decreases, which is preferable. Absent. The ratio of the modified polyphenylene ether component (A) and 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 polypropylene as the component (C) used in the resin composition of the present invention is a propylene homopolymer, an ethylene-propylene copolymer, or a propylene-polymer.
It is an ethylene-α-offine copolymer and has MFR (23
It is preferably 1 to 100 at 0 ° C. 2.16 kg. 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 it is 5 parts by weight or less, there is no improvement effect of weight reduction, and if it is 70 parts by weight or more, the physical properties of the obtained molded product deteriorate, which is not preferable.

Further, as the metal salt of montanic acid which is the component (D) used in the resin composition of the present invention, sodium montanate, potassium montanate, lithium montanate, calcium montanate, zinc montanate, barium montanate. , Aluminum montanate, etc. Among them, sodium montanate is preferable because of its effect 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 the polyamide (component (B)). Add. If the amount is less than 0.1 parts by weight, the effect of improving the releasability is not obtained, and if the amount is more than 3 parts by weight, the physical properties of the obtained molded product are deteriorated, which is not preferable.

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, and is, for example, A.I. V. Tobolsky's “Properties and Struct”
ures of Polymers "(John Willy & Sons, In
c. , 1960) 71 to 78 can be cited, and an elastomer has a Young's modulus at room temperature of 10
^It means a polymer having ⁵ to 10 ⁹ dynes / cm ² (0.1 to 1,020 kg / cm ² ). 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 triblock copolymer in which a double bond of a polybutadiene portion is hydrogenated. , Styrene-isoprene triblock copolymer in which the double bond of polyisoprene is hydrogenated, nitrile rubber, ethylene-propylene copolymer, ethylene-propylene-diene copolymer (EPDM), thiochol rubber, polysulfide rubber, acrylic acid Examples thereof include rubber, polyurethane rubber, a graft product of butyl rubber and polyethylene, polyester elastomer, and polyamide elastomer. Above all, an ABA 'type triblock copolymer is preferable. End blocks A and A'of this block copolymer
Is a polymerized vinyl aromatic hydrocarbon block,
B is a polymerized conjugated diene block or a conjugated diene block in which most of the double bonds are hydrogenated.
Desirably, the molecular weight of the blocks is 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 blocks are thermoplastic homopolymers or copolymers derived from vinyl aromatic compounds whose aromatic moieties may be monocyclic or polycyclic. . Examples of such vinyl-based aromatic compounds include styrene, α-methylstyrene, vinyltoluene, vinylxylene, ethylvinylxylene, vinylnaphthalene and mixtures thereof. The central block B is
Conjugated diene hydrocarbons such as 1,3-butadiene, 2,
Elastomeric polymers derived from 3-dimethylbutadiene, isoprene and 1,3-pentadiene and mixtures thereof, or the majority of the double bonds are hydrogenated. The molecular weight of each end block A and A'is preferably in the range of about 5,000 to about 50,000, while the molecular weight of the central block B is preferably about 25,
The range is from 000 to about 1,500,000. The elastomer is 2 to 5 based on the modified polyphenylene ether.
Add 0 parts by weight, preferably 5 to 40 parts by weight.

The resin composition of the present invention may optionally contain
Other resins, flame retardants, flame retardant aids, stabilizers, UV absorbers,
Various additives such as a plasticizer and a lubricant, a pigment, a filler, and other components may be appropriately mixed. 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 the respective constituent components, it is general that the respective components are mixed and then melt-mixed. The temperature of 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 or the like.

In order to manufacture an automobile relay box from the resin composition of the present invention, an injection molding machine is generally used. The resin composition of the present invention is pelletized, using an injection molding machine, a cylinder temperature of 250 to 320 ° C., a mold temperature of 40 to 120 ° C., a molding pressure of 500 to 2,000 kg / cm ^2.
A relay box for automobiles is manufactured by injection molding under the conditions. FIG. 1 shows an embodiment of an automobile relay box of the present invention.

[0023]

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

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

Comparative Reference Example 1 2,5-dimethylphenol polymer used in Reference Example 1 1.50 kg, Kraton G1651 450 g and K-
1.14 1.50 kg and maleic anhydride 24 g were added, mixed by a Henschel mixer, and then melt-kneaded with a twin-screw extruder at a temperature of 280 to 320 ° C. for about 2 minutes,
Pelletization gave a mixture containing maleic anhydride modified polyphenylene ether.

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

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

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

Example 7 Pellets containing the polyphenylene ether modified with maleic anhydride obtained in Reference Example 1 60 parts by weight, 6,6
-Nylon (Toray Industries: Amilan CM-3007-N)
32 parts by weight, 6-nylon (manufactured by Toray Industries: Amilan C
M-1017) 8 parts by weight and sodium montanate 0.5 part by weight, and then mixed with a twin-screw extruder to 240
Melt kneading was performed at ˜300 ° C. to form pellets. The pellets were injection-molded under the conditions shown below to prepare test pieces for measuring physical properties and automobile relay boxes.

Example 8 Pellets containing the polyphenylene ether modified with maleic anhydride obtained in Reference Example 1 60 parts by weight, 6,6
-Nylon (manufactured by Toray Industries: Amilan CM-3007-
N) 24 parts by weight, 16 parts by weight of 6-nylon (manufactured by Toray Industries Inc .: Amylan CM-1017), and 0.5 parts by weight of sodium montanate are mixed and then melt-kneaded at 240 to 300 ° C. by a twin-screw extruder. It was made into pellets. The pellets were injection-molded under the conditions shown below to prepare test pieces for measuring physical properties and automobile relay boxes.

Comparative Example 7 Pellets containing the polyphenylene ether modified with maleic anhydride obtained in Reference Example 1 60 parts by weight, 6,6
-Nylon (manufactured by Toray Industries: Amilan CM-3007-
N) 10 parts by weight, 30 parts by weight of 6-nylon (Amylan CM-1017 manufactured by Toray Industries, Inc.), and 0.5 parts by weight of sodium montanate are mixed and then melt-kneaded at 240 to 300 ° C. by a twin-screw extruder. It was made into pellets. The pellets were injection-molded under the conditions shown below to prepare test pieces for measuring physical properties and automobile relay boxes.

Comparative Example 8 Pellets containing the polyphenylene ether modified with maleic anhydride obtained in Reference Example 1 60 parts by weight, 6,6
-Nylon (manufactured by Toray Industries: 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 parts 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 conditions shown below to prepare test pieces for measuring physical properties. Attempts were made to mold a relay box for automobiles, but the fluidity of the resin was poor, and a relay box could not be obtained.

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

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

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

(1) Releasability Cylinder temperature 280 ° C., mold temperature 80 ° C., molding pressure 80
A box-shaped molded product was injection-molded under the condition of 0 kg / cm ² , and the resistance value when the molded product was ejected was measured to evaluate the releasability. The results are shown in Table 1.

(2) Tensile yield strength Tensile breaking elongation Cylinder temperature 280 ° C., mold temperature 80 ° C., molding pressure 1,
A dumbbell piece for tensile test having a thickness of 1/8 inch was injection-molded under the condition of 000 kg / cm ² , 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. In addition, under the same conditions as above, a dumbbell piece having a weld portion having a thickness of 1/8 inch (hereinafter referred to as a weld dumbbell piece) is injection-molded,
The weld depth of the obtained weld dumbbell piece was measured, and the tensile yield strength and tensile break elongation were measured.
The results are shown in Table 2.

(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 opening of the relay box and conducting a tensile test. 120 ° C
Also, the lance strength was measured for the relay box that was heat-treated at 150 ° C. for 1000 hours. The results are shown in Table 3.

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

(5) Weather resistance test The dumbbell piece for 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 rainfall cycle was 18 minutes / 120 minutes. After the test, the color change (ΔE) was measured and the appearance was observed with an optical microscope, and the tensile strength and the elongation at break were measured to evaluate the weather resistance. The results are shown in Table 5.

(6) Reusability test Cylinder temperature 280 ° C., mold temperature 80 ° C., molding pressure 1,
A 1 / 8-inch thick dumbbell piece for tensile test was injection-molded under the condition of 000 kg / cm ² , and this was crushed and the same dumbbell piece was injection-molded under the same condition. Play this once,
Thereafter, this operation was repeated up to 10 times. The reusability was evaluated by measuring the tensile strength and breaking elongation of the test dumbbell piece for each molding. The results are shown in Table 6.

[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 is excellent in moldability (particularly fluidity and mold releasability), and an automobile relay box molded from the resin composition has heat resistance and mechanical properties. Satisfies the requirements for dynamic strength, weld strength, weather resistance, solvent resistance, and reusability. Furthermore, since the automobile relay box of the present invention is manufactured from a lightweight composition, not only is it lighter in weight than conventional relay boxes, but also a manufacturing process is simplified because there is no need for moisture absorption treatment or the like. it can.

[Brief description of drawings]

FIG. 1 is a perspective view of a vehicle relay box that is an embodiment of the present invention.

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

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical indication C08L 71/12 LQM 9167-4J LQP 9167-4J 77/00 LQS 9286-4J LQV 9286-4J H02G 3 / 16 A 9175-5G

Claims (3)

[Claims] 1. A polyphenylene ether modified with an unsaturated carboxylic acid having (A) an ethylenic double bond and b) a carboxyl group or an acid anhydride group at the same time.
70% by weight, and (B) 6,6-nylon 100 parts by weight of 6-nylon compounded with 10-100 parts by weight of polyamide 30
To 80% by weight of the mixture, (C) the modified polyphenylene ether in the mixture.
5 to 70 parts by weight of polypropylene based on 0 part by weight, and (D) 0.1 to 3 parts by weight of metal salt of montanic acid based on 100 parts by weight of the mixture; Composition. 2. The composition for an automobile 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. A relay box for an automobile, comprising the composition according to claim 1 or 2.