KR20150078240A - Polyamide Resin Composition - Google Patents

Abstract

The present invention relates to a polyamide resin composition, and more specifically, to a polyamide resin composition comprising: a polyamide resin; 9-65 parts by weight of an acrylonitrile butadiene styrene copolymer (ABS) resin with respect to 100 parts by weight of the polyamide resin; 2.5 to 18.5 parts by weight of a maleimide type copolymer including maleimide; 35 to 125 parts by weight of glass fiber; and 0.2 to 4.5 parts by weight of a phenol-based heat resistant agent. The polyamide resin composition has low ion elution degree, has less change of physical properties even if it is exposed to external environments at high temperature or low temperature, and shows excellent productivity, thereby being easily applied for a material for a membrane humidifier of a fuel cell vehicle.

Description

TECHNICAL FIELD [0001] The present invention relates to a polyamide resin composition,

TECHNICAL FIELD The present invention relates to a polyamide resin composition for use in a humidifier or a material surrounding a stack, which serves to maintain and improve the performance of a fuel cell apparatus of an automobile.

A fuel cell is a high efficiency, pollution-free power generation system that converts chemical energy of hydrogen and oxygen into electrical energy by electrochemical reaction. The cathode is supplied with oxygen and the anode with hydrogen. And the electricity is generated together with water and heat. Unlike conventional chemical batteries, such as batteries and accumulators, fuel cells can produce electricity continuously as long as hydrogen and oxygen are supplied, and they are twice as efficient as internal combustion engines because they have no heat loss. Therefore, the fuel cell is advantageous not only to be environmentally friendly, but also to reduce the fear of depletion of fossil fuel.

Such a fuel cell can be largely classified into a polymer electrolyte fuel cell, a phosphoric acid fuel cell, a molten carbonate fuel cell, a solid oxide fuel cell, and an alkaline fuel cell depending on the type of electrolyte used.

One of the most important factors in improving the performance of a polymer electrolyte fuel cell is to maintain a water content by supplying an appropriate temperature and predetermined moisture to a polymer electrolyte membrane of a membrane-electrode assembly. This is because, when the polymer electrolyte membrane is dried, the power generation efficiency sharply drops.

In order to maintain an appropriate temperature and humidity environment in the polymer electrolyte membrane of the membrane-electrode assembly, a humidifier is essential.

The humidifier has a merit that the water vapor in the unreacted gas is supplied to the polymer electrolyte membrane using a membrane that selectively permeates only the water vapor contained in the unreacted gas in the polymer electrolyte membrane, and the humidifier can be made lighter and smaller. A hollow fiber membrane having a large permeation area per unit volume is preferable for such a selective permeable membrane.

The material used in the humidifying membrane method should not adversely affect the performance of the hollow fiber membrane. Ions degrade the performance of the membrane over time. Therefore, the ion should not be eluted from the humidifier material, and should be low even if it is eluted. Also, when applied to automobiles, the characteristics of automobile vibration, heat resistance, cold resistance, etc. should be good.

Various polymer materials have been proposed to satisfy these properties. In particular, since the high heat-resistant polyamide resin is excellent not only in mechanical properties but also in heat resistance or cold resistance properties, its use as a humidifier material has been recently proposed.

However, in case of high heat-resistant polyamide resin, the productivity is not good because the cycle time is considerably long due to the high melting temperature during product molding.

In Korean patent (10-2012-0157459), polypropylene is bonded to polyamide and glass fiber reinforced form is proposed. At this time, although polypropylene used can exhibit low ion elution characteristics, the membrane humidifier module There is a problem that unstable dimensional stability and surface characteristics are poor.

Therefore, it is required to develop a material for a humidifier which satisfies both of low ion elution, high mechanical properties, heat resistance and cold resistance, shortening molding cycle time, and improving dimensional stability and surface characteristics.

An object of the present invention is to provide a polyamide resin composition which can exhibit excellent mechanical properties, heat resistance and cold resistance even when exposed to a high temperature and high humidity environment for a long period of time.

The present invention also provides a molded article comprising the polyamide resin composition.

Accordingly, the present invention provides, as a first preferred embodiment, a polyamide resin; 9 to 65 parts by weight of an acrylonitrile butadiene styrene copolymer (ABS) resin, based on 100 parts by weight of the polyamide resin; 2.5 to 18.5 parts by weight of a maleimide type copolymer including maleimide; 35 to 125 parts by weight of glass fiber; And 0.2 to 4.5 parts by weight of a phenolic heat-resistant agent. A specimen having a surface area of 80 cm 2 was prepared, and the specimen was immersed in DEIONIZED WATER 200ML, heated at 80 ° C for 1,500 hours, The specimens were immersed in DEIONIZED WATER 200ML and heated at 80 DEG C for 168 hours, and then measured for sodium, potassium, magnesium, calcium, copper, iodine, phosphorus , And a total sum of cation concentrations including lithium, aluminum, manganese, iron and nickel is 8 ppm or less.

The polyamide resin according to this embodiment is preferably selected from the group consisting of polyamide 6, polyamide 12, polyamide 66, polyamide 6/66, polyamide 6/12, polyamide 6 / 6T, polyamide 6 / 6I and copolymers thereof And may include at least one selected.

The polyamide resin according to this embodiment may have a relative viscosity of 2.0 to 3.5.

The ABS resin according to the embodiment may have a melt index (MI, MELT INDEX) of 3 to 35 g / 10 min as measured according to ASTM D1238.

The glass fiber according to the embodiment may have a chop shape having a length of 3 to 6 mm and a cross-sectional diameter of 10 to 13 탆.

The phenolic heat resisting agent according to this embodiment may be represented by the following general formula (1).

Formula 1

Here, R 1 is a methyl group, and R 2 and R 3 are each an alkyl group having 1 to 5 carbon atoms.

The polyamide resin composition according to this embodiment may further comprise at least one additive selected from the group consisting of an antioxidant, a flame retardant, a fluorescent whitening agent, a plasticizer, a thickener, an antistatic agent, a releasing agent, a pigment and a nucleating agent.

The polyamide resin composition according to this embodiment has a tensile strength of 1,000 kg / cm 2 or more based on ASTM D638, a flexural strength of 1,500 kg / cm 2 or more based on ASTM D790, and a heat distortion temperature according to ASTM D64 of 4.6 kg / cm < 2 >.

The polyamide resin composition according to the present invention has excellent physical properties and thermal resistance characteristics even when it is left in a long-time vibration environment, high temperature and low temperature environment, and its mechanical properties are not greatly changed. Even if it is immersed in water for a long time, And is suitable for application to a membrane humidifier which serves to maintain and improve the performance of the fuel cell device.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a polyamide resin composition, 9 to 65 parts by weight of an acrylonitrile butadiene styrene copolymer (ABS) resin, based on 100 parts by weight of the polyamide resin; 2.5 to 18.5 parts by weight of a maleimide type copolymer including maleimide; 35 to 125 parts by weight of glass fiber; And 0.2 to 4.5 parts by weight of a phenolic heat resistant agent. The polyamide resin composition has a surface area of 80 cm < 2 >. The specimen is immersed in DEIONIZED WATER 200ML, After heating for 1500 hours, a specimen having a measured electrical conductivity of 80 micro Siemens or less and a surface area of 270 cm 2 was prepared. The specimen was immersed in DEIONIZED WATER 200ML, heated at 80 ° C for 168 hours, and then measured The total sum of cation concentrations including sodium, potassium, magnesium, calcium, copper, iodine, phosphorus, lithium, aluminum, manganese, iron and nickel is 8 ppm or less.

[Polyamide resin]

The polyamide resin according to the present invention is selected from polyamide 6, polyamide 12, polyamide 66, polyamide 6/66, polyamide 6/12, polyamide 6 / 6T, polyamide 6 / 6I and copolymers thereof And may include one or more species.

Among them, the polyamide 6 is a thermoplastic resin represented by the following Chemical Formula 2, and the polyamide 66 may be a thermoplastic resin represented by Chemical Formula 3 below.

The polyamide resin according to this embodiment may have a relative viscosity of 2.0 to 3.5.

The polyamide resin may be a polyamide 6 resin, a polyamide 66 resin,

(2)

_{- (NH- (CH 2) 5} -CO) n -

Here, n is an integer of 200 to 15,000.

(3)

_{- (NH- (CH 2) 6} -HN-CO- (CH 2) 4 -CO) n -

Here, n is an integer of 200 to 15,000.

The polyamide resin may have a relative viscosity of 2.0 to 3.5, and the relative viscosity is a value measured by adding 1 g of a polyamide resin to 100 ml of 96% sulfuric acid at 20 占 폚.

If the relative viscosity of the polyamide resin is less than 2.0, the rigidity and heat resistance may be deteriorated. If the relative viscosity is higher than 3.5, excessive friction heat may be generated between the screw and the polyamide resin in the molding machine during high- A high pressure is required for molding, which may be a burden on a molding machine and a mold, and injection molding may be difficult.

[ABS (acrylonitrile butadiene styrene copolymer) resin]

The acrylonitrile butadiene styrene copolymer (ABS) resin according to the present invention is a copolymer resin obtained by copolymerizing acrylonitrile, 1,3-butadiene, and styrene, and is an amorphous polymer. It retards the crystallization of the polyamide resin composition of the present invention It is possible to ensure an appropriate molding shrinkage ratio, thereby exhibiting an impact resistance characteristic.

The content of the ABS resin may be 9 to 65 parts by weight based on 100 parts by weight of the polyamide resin. If the content of the ABS resin is less than 9 parts by weight, the effect of improving the molding shrinkage is insignificant, And the shrinkage percentage of the article may be different from the standard, so that the assembly may be impossible and the ionic conductivity may be increased. When the amount exceeds 65 parts by weight, the heat stability may be poor and the heat resistance may be deteriorated.

The ABS resin may have a melt index (MI, MELT INDEX) of 3 to 35 g / 10 min as measured according to ASTM D1238. When the melt index is less than 3 g / 10 min but more than 35 g / 10 min, There is a possibility of occurrence of a problem of strength and a decrease in strength.

[Maleimide type copolymer]

The maleimide type copolymer according to the present invention serves as a compatibilizer. That is, since the ABS resin has poor compatibility with the polyamide resin, a copolymer containing maleimide as a compatibilizer may be used in order to improve the compatibility of the ABS resin and the polyamide resin.

The copolymer containing maleimide is collectively referred to as a material copolymerized with maleimide, and the copolymer containing maleimide may be an n-phenylmaleimide / styrene copolymer.

The content of the n-phenylmaleimide / styrene copolymer may be 2.5 to 18.5 parts by weight based on 100 parts by weight of the polyamide resin. When the content of the n-phenylmaleimide / styrene copolymer is less than 2.5 parts by weight, The compatibility between the resin and the ABS resin may be deteriorated. If the amount exceeds 18.5 parts by weight, the manufacturing cost may increase and the price competitiveness may be deteriorated. If the compatibility is not ensured, the cation concentration and the electrical conductivity are increased by the polyamide resin which is phase separation between the polyamide and the polypropylene resin and has a high ion elution property compared to the polypropylene resin. As a result, the copolymer containing maleimide And may be contained in the above-mentioned amounts.

[Fiberglass]

The glass fiber according to the present invention may be used to improve the rigidity of the polyamide resin composition, and the glass fiber may be represented by the following formula (4).

Formula 4

_{CaO · SiO 2 · Al 2 O} 3

The glass fiber may be one containing CaO 10 to 20 wt%, SiO ₂ 50 to 70% by weight and Al ₂ O _{3 2} to 25% by weight.

The glass fiber may have a chop shape having a length of 3 to 6 mm and a cross-sectional diameter of 10 to 13 탆.

When the content of the glass fiber is less than 35 parts by weight, the tensile strength and the bending strength may be lowered. When the amount of the glass fiber is more than 100 parts by weight, the glass fiber content may be in the range of 35 to 100 parts by weight based on 100 parts by weight of the polyamide resin. Surface defects may occur or electric conductivity may be increased during manufacture.

On the other hand, the glass fiber may be a glass fiber surface treated with a silane coupling treatment for interfacial adhesion with other components. Since glass fibers are composed mainly of cations such as Ca, Si and Al, they can be the biggest factors that increase the cation concentration and electrical conductivity. Therefore, in order to inhibit cation elution due to hydrolysis, the surface treated with silane, such as the glass fiber used in the present invention, is effective, and the adhesive strength to the polyamide resin and the polypropylene resin is improved to prevent the glass fiber from being exposed to water Is most effective in inhibiting cation elution.

[Phenolic heat-resistant agent]

The phenolic heat resisting agent according to the present invention has a role of lowering the decomposition of the polymer, thereby suppressing the decomposition of the polymer and suppressing the increase of the electric conductivity due to ions from the polymer.

The phenolic heat resistant agent may be represented by the following formula (1).

Formula 1

Here, R 1 is a methyl group, and R 2 and R 3 are each an alkyl group having 1 to 5 carbon atoms.

The content of the phenolic heat-resistant agent may be 0.2 to 4.5 parts by weight based on 100 parts by weight of the polyamide resin. If the content of the phenolic heat-resistant agent is 0.2 parts by weight, the effect of improving the heat resistance may be insufficient. There may be no benefit from exceeding the content.

The polyamide resin composition according to the present invention can be applied to a membrane humidifier for maintaining and improving the performance of an automotive fuel system. The polyamide resin composition has a surface area of 80 cm 2, and the specimen is subjected to DEIONIZED WATER 200ML And then heated at 80 DEG C for 1500 hours, and the measured electrical conductivity may be 80 micro-Siemens or less. If the electrical conductivity of the polyamide resin composition exceeds 80 micro Siemens, the total sulfonic acid group of the membrane humidifier membrane is contaminated by 5% or more, resulting in a change in the water flux. Thus, the membrane humidifier membrane, Which may cause a reduction in the service life.

Specifically, the electrical conductivity was measured by injection molding a specimen having a surface area of 80 cm 2, sealing the specimen in a hard glass bottle containing DEIONIZED WATER 200ML so as not to protrude above the water surface, sealing it in an oven at 80 ° C And then allowed to stand at room temperature, and then measured through an electric conductivity meter. DEIONIZED WATER refers to water from which all dissolved ions have been removed, usually ion exchange resin is used, and it is used for industrial water, drinking water, etc. Siemens is also expressed as the concentration of ions, that is, the unit of electrical conductivity, divided by ohm, the unit of electrical resistance. The electrical conductivity can be measured using an InLab 741 sensor in a SEVEN COMPACT product from METTLER TOLEDO.

The specimen having a surface area of 270 cm 2 of the polyamide resin composition was prepared, and the specimen was immersed in DEIONIZED WATER 200ML, heated at 80 ° C for 168 hours, and then measured for sodium, potassium, magnesium, calcium, copper, iodine And the total sum of cation concentrations including phosphorus, lithium, aluminum, manganese, iron and nickel is 8 ppm or less. If the total sum of the cation concentrations exceeds 8 ppm, the hollow fiber membrane in the humidifier is contaminated, There is a problem of reducing the efficiency of the stack.

Further, the polyamide resin composition preferably has a tensile strength of 1,000 kg / cm 2 or more based on ASTM D638, a flexural strength of 1,500 kg / cm 2 or more based on ASTM D790, a heat distortion temperature of 4.6 kg / Lt; 2 > load.

The polyamide resin composition exhibiting such physical properties does not significantly change its mechanical properties even when it is left in a vibration environment for a long time, a high temperature or a low temperature environment, and has excellent physical properties and thermal resistance characteristics. Therefore, it can be easily applied to a humidifier, Can be applied.

That is, the polyamide resin composition of the present invention is excellent in ion elution even when exposed to a high temperature and high humidity environment for a long time, and also has excellent mechanical properties, heat resistance, cold resistance, high productivity, dimensional stability, It can be applied to humidifier, CATHODE OXYGEN DEVICE, AIR DUCT, WATER TRAP material which is the parts around STACK of STACK.

[Manufacturing method]

The polyamide resin composition according to the present invention is a polyamide resin composition comprising a polyamide resin, an acrylonitrile butadiene styrene copolymer (ABS) resin, an n-phenylmaleimide / styrene copolymer, a glass fiber and a phenolic heat- And melt-kneading at 260 占 폚. If the temperature during the melt-kneading is less than 220 ° C, the melting point of the polyamide resin becomes substantially similar to that of the polyamide resin, so that the melt-kneading can not be sufficiently carried out. If the temperature is higher than 260 ° C, the additive or the polyamide resin may be thermally decomposed or volatilized. You can.

For the production of the polyamide resin composition, a commonly used melt-kneading method and equipment can be used. Specific examples of the equipment used for such melt-kneading include a uniaxial or biaxial screw extruder, Two or more injection ports may be provided for one kneading. In the case of using the uniaxial or biaxial screw extruder having the first and second injection ports, a polyamide resin, an ABS (acrylonitrile butadiene styrene copolymer) resin and a heat resistant agent are introduced into the first inlet, It is preferable to inject the glass fiber into the extruder because the effect of homogeneous kneading by the shear of the screw in the extruder can be obtained.

In order to reduce the volatilization of the additive during melt kneading and to maximize the physical properties of the composition, it is desirable to minimize the residence time in an apparatus such as an extruder. Antioxidants, flame retardants, fluorescent whitening agents, plasticizers, thickeners, antistatic agents, release agents, pigments, nucleating agents and mixtures thereof may be added within the range not contradictory to the object of the present invention.

The polyamide resin composition as described above can be easily applied to a humidifier because it has excellent physical properties and thermal resistance characteristics without significantly changing its mechanical properties even when it is left in a vibration environment for a long time, a high temperature and a low temperature environment. The polyamide resin composition described above is used as a hollow fiber membrane humidifier, which is a device necessary for increasing the power generation efficiency of a stack of a fuel cell vehicle. The humidification device has a circular or rectangular structure with a thickness of 1 to 10 mm. The polyamide resin composition may also be used as a humidifier device for a fuel cell membrane for buildings.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are only for describing the present invention in more detail and that the scope of the present invention is not limited by these embodiments.

Examples 1 to 4 8

According to the composition shown in Table 1, a polyamide resin, an ABS resin, an n-phenyl maleimide / n-butyl acrylate copolymer, and a nylon resin were added to the primary raw material inlet of a twin screw extruder (COPERION, Germany), which was sequentially heated from the feed feeder FEEDER to the product discharging portion, Glass fiber (CS-311, KCC) was added to the inlet of the third raw material, and the heat melting and kneading process (IRFANOX 1010, BASF) To prepare a polyamide resin composition.

Comparative Example  1 and Comparative Example 2

A polyamide resin composition was prepared in the same manner as in Example 1, except that the content of the ASB resin was changed as shown in Table 1.

Comparative Example  3 and Comparative Example 4

A polyamide resin composition was prepared in the same manner as in Example 1, except that the glass fiber content was changed as shown in Table 1.

Comparative Example  5

A polyamide resin composition was prepared in the same manner as in Example 1, except that the content of the phenolic heat resistant agent was changed as shown in Table 1.

Tensile strength, flexural strength, heat distortion temperature, electrical conductivity, cation concentration and surface characteristics were measured for the polyamide resin compositions prepared in Examples and Comparative Examples, and the results are shown in Table 2.

(1) Tensile strength

According to ASTM D638, a 1/8 inch specimen was fabricated and a value of less than 1,100 kg / cm2 was judged to be defective.

(2) Flexural strength

A 1/8 inch specimen was prepared according to ASTM D790, and a value less than 1,500 kg / cm 2 was judged to be defective.

(3) Heat deformation temperature

A 1/4 inch specimen was prepared according to ASTM D648 and measured at a load of 4.6 kg / cm 2 was judged as poor.

(4) Electrical conductivity

A specimen having a surface area of 80 cm 2 was prepared using the polyamide resin compositions of the examples and the comparative examples, and the specimens were completely immersed in DEIONIZED WATER 200ML, and the electrical conductivity was measured after 1500 hours at 80 ° C.

(5) Cation concentration

A specimen having a surface area of 270 cm 2 was prepared using the polyamide resin compositions of the examples and the comparative examples and completely immersed in DEIONIZED WATER 200ML. After 168 hours at 80 ° C, ICP-MS was used to measure sodium, potassium, magnesium, The cation concentrations of calcium, copper, iodine, phosphorus, lithium, aluminum, manganese, iron and nickel were measured.

(6) Surface properties

The polyamide resin compositions of the examples and comparative examples were dried in a chip state at 90 DEG C for 5 hours using a dehumidifying type dryer, and then extruded by a 150-ton injection molding machine manufactured by Nissei, in a width of 350 mm, a length of 100 mm, Injection temperature was set to 270 ℃ and mold temperature was set to 20 ℃ using a rectangular mold with a diameter of 7mm and a length of 80mm and a primary injection pressure of only 1,100kg / 3 seconds, and a cooling time of 10 seconds, the flow marks of the gate portion among the molded products released from the mold were visually observed, and the surface characteristics were evaluated according to the following criteria.

- Good: Flow mark not confirmed

- Bad: Flow mark confirmed

Unit: parts by weight Polyamide
Suzy ABS resin n-phenylmaleimide / styrene copolymer Glass fiber Phenolic heat-resistant agent Example 1 100 A1 21.7 6.5 87.0 2.2 Example 2 100 A1 60.6 18.2 121.2 3.0 Example 3 100 A1 9.5 2.9 76.2 1.9 Example 4 100 A1 21.3 6.4 85.3 0.2 Example 5 100 A2 37.7 11.3 37.7 1.9 Example 6 100 A3 21.7 6.5 87.0 2.2 Example 7 100 A4 22.2 6.7 88.9 4.4 Example 8 100 A5 22.2 6.7 88.9 4.4 Comparative Example 1 100 A1 5.5 1.8 72.7 1.8 Comparative Example 2 100 A1 92.6 25.9 148.1 3.7 Comparative Example 3 100 A1 12.3 3.7 12.3 1.2 Comparative Example 4 100 A1 27.8 8.3 138.9 2.8 Comparative Example 5 100 A1 20.0 6.0 80.1 0.1 * A1: POLYAMIDE 6 (COLON INDUSTRIES)
* A2: POLYAMIDE 66 (ASCEND)
* A3: POLYAMIDE 6 90% weight, POLYAMIDE 66 10% weight
* A4: POLYAMIDE 6 10% weight, POLYAMIDE 66 90% weight
* A5: POLYAMIDE 6 (Relative viscosity 3.3) (KOLON INDUSTRIES)
* A1 ~ A4: Relative viscosity 2.7

The tensile strength
(Kg / cm2) Flexural strength
(Kg / cm2) Heat distortion temperature
(° C) Electrical conductivity
(μS) Cation concentration (ppm) Surface property Example 1 1450 2150 218 58 3.9 Good Example 2 1263 1865 179 44 3.2 Good Example 3 1755 2689 221 78 7.6 Good Example 4 1462 2145 217 77 7.8 Good Example 5 1145 1646 181 42 3.1 Good Example 6 1492 2230 215 60 4 Good Example 7 1485 2285 241 62 4.3 Good Example 8 1498 2245 216 57 4.2 Good Comparative Example 1 1875 2851 217 84 8.2 Good Comparative Example 2 1078 1630 169 43 3.1 Good Comparative Example 3 912 1490 148 42 3.2 Good Comparative Example 4 1749 2563 220 87 8.3 Bad Comparative Example 5 1568 2257 216 102 9.1 Good

As shown in Table 2, when the ABS resin was less than the proper amount, the electrical conductivity and the cation concentration were increased (Comparative Example 1), and when the ABS resin was more than the proper amount, the tensile strength was decreased Example 2).

In addition, when the glass fiber is less than the proper amount, the tensile strength and the heat distortion temperature are lowered (Comparative Example 3), and when the glass fiber exceeds the proper amount, the electrical conductivity and the cation concentration are increased and the surface property is also poor 4).

In addition, when the content of the phenolic heat resistant agent is less than the proper amount, the electric conductivity and the cation concentration are increased (Comparative Example 5).

On the other hand, polyamide resin, ASB resin, n-phenylmaleimide / styrene copolymer, The polyamide resin composition containing both the glass fiber and the phenolic heat-resistant agent in an appropriate amount has excellent tensile strength, bending strength, thermal deformation temperature, electrical conductivity, cation concentration and surface characteristics and is excellent as a material for a fuel cell membrane humidifier It was found appropriate.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will appreciate that such specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereto will be. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.

Claims (8)

Polyamide resins;
With respect to 100 parts by weight of the polyamide resin,
9 to 65 parts by weight of an acrylonitrile butadiene styrene copolymer (ABS) resin;
2.5 to 18.5 parts by weight of a maleimide type copolymer including maleimide;
35 to 125 parts by weight of glass fiber; And
0.2 to 4.5 parts by weight of a phenolic heat resistant agent,
A specimen having a surface area of 80 cm 2 was prepared, and the specimen was immersed in DEIONIZED WATER 200ML and heated at 80 ° C for 1,500 hours. The measured electrical conductivity was 80 micro Siemens or less,
The specimens were immersed in DEIONIZED WATER 200ML and heated at 80 ° C for 168 hours. The specimens were measured for sodium, potassium, magnesium, calcium, copper, iodine, phosphorus, Manganese, iron, and nickel is 8 ppm or less. The method according to claim 1,
The polyamide resin is at least one selected from the group consisting of polyamide 6, polyamide 12, polyamide 66, polyamide 6/66, polyamide 6/12, polyamide 6 / 6T, polyamide 6/6 I, Wherein the polyamide resin composition is a polyamide resin composition. The method according to claim 1,
Wherein the polyamide resin has a relative viscosity of 2.0 to 3.5. The method according to claim 1,
Wherein the ABS resin has a melt index (MI, MELT INDEX) of 3 to 35 g / 10 min as measured according to ASTM D1238. The method according to claim 1,
Wherein the maleimide-containing copolymer is an n-phenylmaleimide / styrene copolymer. The method according to claim 1,
Wherein the phenolic heat resistant agent is represented by the following formula (1).
Formula 1

Here, R 1 is a methyl group, and R 2 and R 3 are each an alkyl group having 1 to 5 carbon atoms. The method according to claim 1,
Wherein the polyamide resin composition further comprises at least one additive selected from the group consisting of an antioxidant, a flame retardant, a fluorescent whitening agent, a plasticizer, a thickener, an antistatic agent, a releasing agent, a pigment and a nucleating agent. The method according to claim 1,
A tensile strength according to ASTM D638 of not less than 1,000 kg /
The flexural strength according to ASTM D790 is 1,500 kg / cm < 2 > or more,
Wherein the heat distortion temperature according to ASTM D64 is 150 DEG C or higher at a load of 4.6 kg / cm < 2 >.