KR102196125B1 - Polyamide resin composition and method thereof - Google Patents

Abstract

The present invention relates to a polyamide resin composition and a method for producing the same, and more particularly, (a) 16 to 65% by weight of a polyamide resin; (b) 0.01 to 10% by weight of a flow modifier; (c) 31 to 69% by weight of filler; (d) 0.1 to 10% by weight of nigrosine; And (e) 0.1 to 10% by weight of a pigment, wherein (b) the flow modifier is a dendritic polymer, wherein the terminal functional group is a hydroxyl group, a sulfhydryl group, an amino group, a carboxyl group, an aldehyde group, and an epoxy group. It relates to a polyamide resin composition, characterized in that selected, and a method for producing the same.
According to the present invention, there is an effect of providing a polyamide resin composition having improved fluidity and appearance characteristics while having excellent mechanical properties such as impact strength and a method of manufacturing the same.

Description

Polyamide resin composition and its manufacturing method {POLYAMIDE RESIN COMPOSITION AND METHOD THEREOF}

The present invention relates to a polyamide resin composition and a method of manufacturing the same, and more particularly, to a polyamide resin composition having excellent mechanical properties such as impact strength and improved fluidity and appearance characteristics, and a method of manufacturing the same.

Greenhouse gas emission regulations and fuel economy regulations in countries around the world are being reinforced, and the need for lightweight materials through the development of metal replacement parts is emerging to improve fuel efficiency of transportation equipment. Existing automobile parts are made of steel, so they have good strength but are heavy, and magnesium and aluminum, which are substitute materials, are good for weight reduction, but their price competitiveness is insufficient.

Accordingly, various studies are being conducted on composite materials in which thermoplastic resins are applied as a substitute for steel or aluminum. Among these thermoplastic resins, polyamide resins are excellent in high mechanical strength, moldability, long-term physical properties, etc., and thus, research to be applied as interior and exterior materials for automobiles is actively underway.

Meanwhile, in order to improve physical properties such as tensile strength or tensile modulus so that polyamide resin can be suitable for interior and exterior materials of automobiles, inorganic fillers such as graphite, glass fiber, talc, etc. are dispersed in the resin as a filler to produce a polyamide composite. The method is widely used.

However, as the content of inorganic fillers such as glass fiber and talc increases, the specific gravity increases, so that the weight of the part increases, and there is a problem that the filler is lifted to the surface of the injection product.

In addition, a method of improving the appearance of the polyamide resin composition by adding an organic acid to improve fluidity is disclosed, but in this case, there is a limitation in that mechanical properties are greatly reduced.

Korean Patent Registration No. 10-0830133

In order to solve the problems of the prior art as described above, an object of the present invention is to provide a polyamide resin composition having excellent mechanical properties such as impact strength and improved fluidity and appearance characteristics, and a method of manufacturing the same.

All of the above and other objects of the present invention can be achieved by the present invention described below.

In order to achieve the above object, the present invention (a) polyamide resin 16 to 65% by weight; (b) 0.01 to 10% by weight of a flow modifier; (c) 31 to 69% by weight of filler; (d) 0.1 to 10% by weight of nigrosine; And (e) 0.1 to 10% by weight of a pigment, wherein (b) the flow modifier is a dendritic polymer, wherein the terminal functional group is a hydroxyl group, a sulfhydryl group, an amino group, a carboxyl group, an aldehyde group, and an epoxy group. It provides a polyamide resin composition, characterized in that selected.

In addition, the present invention (a) polyamide resin 16 to 65% by weight; (b) 0.01 to 10% by weight of a flow modifier; (c) 31 to 69% by weight of filler; (d) 0.1 to 10% by weight of nigrosine; And (e) extruding after melt-kneading 0.1 to 10% by weight of the pigment, wherein (b) the flow modifier is a dendritic polymer, and the terminal functional group is a hydroxyl group, a sulfhydryl group, an amino group, a carboxyl group, It provides a method for producing a polyamide resin composition, characterized in that selected from the group consisting of an aldehyde group and an epoxy group.

According to the present invention, there is an effect of providing a polyamide resin composition having improved fluidity and appearance characteristics while having excellent mechanical properties such as impact strength, and a method of manufacturing the same.

Hereinafter, the polyamide resin composition of the present disclosure and a method of manufacturing the same will be described in detail.

The present inventors have tried to develop a polyamide resin composition having excellent mechanical properties such as impact strength while solving the lifting phenomenon of the filler from the surface of the injection product generated when a filler is added in a high content. As a result, a specific type of flow modifier is used. When used, it was confirmed that the appearance of the surface of the injection product was improved. In addition, it was confirmed that when a specific type of polyamide resin was adjusted to a specific content range, mechanical properties such as fluidity and impact strength were excellent. Based on these results, the present invention was completed as a result of further research.

The polyamide resin composition of the present invention comprises (a) 16 to 65% by weight of a polyamide resin; (b) 0.01 to 10% by weight of a flow modifier; (c) 31 to 69% by weight of filler; (d) 0.1 to 10% by weight of nigrosine; And (e) 0.1 to 10% by weight of a pigment, wherein (b) the flow modifier is a dendritic polymer, wherein the terminal functional group is a hydroxyl group, a sulfhydryl group, an amino group, a carboxyl group, an aldehyde group, and an epoxy group. It is characterized by being selected.

Hereinafter, each component included in the polyamide resin composition will be described in detail.

(a) Polyamide Suzy

The (a) polyamide resin is, for example, 16 to 65% by weight, or 30 to 50% by weight based on the polyamide resin composition. Preferably, it may be contained in an amount of 45 to 50% by weight, and within this range, mechanical properties such as impact strength are excellent, and gloss and appearance characteristics are improved.

The (a) polyamide resin may be, for example, a cyclic lactam or a condensation polymerization of two or more w-amino acids, diacids and diamines may be used, and further homopolyamide , May be a copolyamide type.

The polyamide resin may be selected from one or more of polyamide 6, polyamide 12, polyamide 6,10, polyamide 6,12, polyphthalamide and polyamide 4,6, and improved appearance characteristics It is preferable to use polyamide 6.

The (a) polyamide resin may have, for example, a relative viscosity measured in a 96% sulfuric acid solvent greater than 2.0 to 3.4, 2.1 to 2.6, preferably 2.2 to 2.4, and impact within this range. It has excellent mechanical properties such as strength, improves fluidity, and has excellent appearance characteristics.

The relative viscosity of this substrate is obtained by dissolving 0.1 g of a sample in 96% sulfuric acid to a concentration of 0.4 g/100 ml for 90 minutes, transferring it to an Ubbelohde viscometer and maintaining it in a 30 thermostat for 10 minutes, and aspirating with a viscometer. The number of seconds to fall of the solution was calculated using an aspirator. The number of seconds to fall of the solvent was also determined by the same method, and then calculated by the following equation for calculating the relative viscosity (RV) value.

RV = number of seconds to fall of sample/number of seconds to fall of solvent

The polyamide resin according to the present invention may be prepared by a method known to a person of ordinary skill in the art to which the present invention pertains, or may be commercially available for use.

(b) Flow modifier

The polyamide resin composition of the present invention solves the problem of lifting of the filler to the surface of a molded article containing the polyamide resin composition when an excessive amount of the filler is used, and improves mechanical properties such as impact resistance, fluidity, and appearance characteristics. It contains a flow modifier to improve.

The (b) flow modifier is, for example, 0.01 to 10% by weight, or 0.1 to 3% by weight based on the polyamide resin composition. Preferably, it may be included in an amount of 0.1 to 1% by weight, and within this range, mechanical properties such as impact strength are excellent, and in particular, gloss and appearance characteristics are remarkably improved.

The flow modifier (b) is a dendritic polymer and has a reactive group at each end group, thereby preventing entanglement between polyamide chains and minimizing deterioration of mechanical properties of the polyamide resin composition.

The dendritic polymer of the present disclosure is a polymer having a continuous branch structure and a large number of end groups, and is generally classified into a dendrimer and a hyperbranched polymer.

The dendrimer of the present disclosure refers to a polymer in which a chain of molecules is regularly spread in three dimensions from the center to the outside according to a certain rule.

In addition, the hyperbranched polymer of the present disclosure refers to a multi-branched polymer having a branched structure in a repeating unit, and has a chemical structure similar to that of a dendrimer, but a highly regular branched structure or a high degree of control of the molecular weight of the dendrimer. It does not lose, that is, there are some branch defects in the dendrimer structure, and branches are formed according to a probability distribution, and thus have a wide molecular weight distribution.

The dendrimer is, for example, a core unit positioned at the center of the entire spherical structure and a bridge unit, which is a unit structure that constantly repeats and extends around the core unit, increasing the generation, and is connected to the bridge unit. It may include a dendron unit located at the terminal (meaning "terminal functional group").

For example, the (b) flow modifier may have 1 to 15 generations, or 1 to 10, preferably 1 to 7, and in this case, the resin composition has excellent mechanical properties, gloss and appearance characteristics.

As an example, the (b) flow modifier is a dendrimer, and the terminal functional group may be selected from the group consisting of a hydroxyl group, a sulfohydryl group, an amino group, a carboxyl group, an aldehyde group, and an epoxy group, and consider mechanical properties, gloss and appearance characteristics. In this case, it is preferably an amino group.

For example, the (b) dendrimer as the flow modifier may be represented by the following Formula 1.

[Formula 1]

(In Formula 1, R is an alkyl group having 3 to 20 carbon atoms or an aryl group having 6 to 20 carbon atoms, m is an integer of 1 to 5, n is an integer of 1 to 10)

As a specific example, the (b) dendrimer as a flow modifier may be represented by the following Formula 2 or the following Formula 3,

[Formula 2]

[Formula 3]

In this case, the lifting phenomenon of the surface of the molded article generated by using a high content of filler is improved, and there is an effect of improving fluidity, gloss and appearance characteristics while having excellent mechanical properties such as impact strength.

In another example, the (b) flow modifier is a hyperbranched polymer, and the terminal functional group may be selected from the group consisting of a hydroxyl group, a sulfhydryl group, an amino group, a carboxyl group, an aldehyde group, and an epoxy group. In this case, flowability, gloss and There is an effect of improving the appearance characteristics.

As the flow modifier (b), the hyperbranched polymer has a highly branched (branched) structure as a core portion, and may have an acid group (eg, carboxylic acid) and an acid decomposable group (eg, carboxylic acid ester) at the molecular end, In this case, entanglement between molecules appearing in the linear polymer is small, and swelling by the solvent is also small compared to the molecular structure crosslinking the main chain.

For example, the hyperbranched polymer may be a hyperbranched polyester having a terminal functional group of a carboxyl group, and in this case, the lifting phenomenon of the surface of the molded article generated by using a high content filler is improved, and mechanical properties such as impact strength are improved. While excellent in physical properties, there is an effect of improving fluidity, gloss, and appearance characteristics.

As a specific example, the hyperbranched polymer may use VCA-1, which is available from Kempia.

(c) Filler

In the present invention, in order to improve the mechanical properties, heat resistance and dimensional stability of the polyamide resin composition, fillers having various particle shapes may be added.

In one example, the (c) filler is 31 to 69% by weight, or 40 to 60% by weight based on the polyamide resin composition. Preferably, it may be contained in an amount of 45 to 55% by weight, and within this range, mechanical properties such as impact strength and fluidity are excellent, and in particular, appearance properties are remarkably improved.

The filler may be an organic filler or inorganic filler commonly used in the technical field of the present invention. Specific examples include carbon fiber, glass fiber, boron fiber, glass beads, glass flakes, carbon black, talc, clay, kaolin, talc, mica, calcium carbonate, wollastonite, calcium titanate whisker, boric acid aluminum whisker, zinc oxide At least one selected from the group consisting of whiskers and calcium whiskers may be used.

In particular, it is preferable to use glass fibers in consideration of the moldability of the resin composition and mechanical properties and appearance characteristics such as tensile strength, impact strength, and the like of a molded article formed from the resin composition.

The glass fiber may be, for example, a chopped glass fiber surface-treated with aminosilane, and in this case, the effect of maintaining a very strong bonding force with the polyamide resin to supplement the rigidity of the resin composition and improve the warpage characteristics and surface smoothness There is.

The glass fiber may be surface-treated with 0.1 to 10% by weight, or 0.1 to 5% by weight, preferably 0.1 to 1% by weight, with the aminosilane as an example, and within this range, strong bonding strength in the polyamide resin composition By maintaining the stiffness there is an effect of increasing.

The glass fiber may be, for example, an E-glass type glass fiber, and in this case, there is an effect of increasing rigidity by maintaining a strong bonding force in the polyamide resin composition.

The glass fiber is, for example, silica (SiO ₂ ) is 50 to 60% by weight, or 52 to 58% by weight, preferably 53 to 57% by weight, boron oxide (B ₂ O ₃ ) is 0.1 to 15% by weight, Alternatively, it may be included in an amount of 1 to 10% by weight, preferably 5 to 10% by weight, and there is an effect of improving the rigidity of the polyamide resin composition within this range.

The glass fiber may be, for example, a cylindrical, cocoon, or flat type, and in this case, there is an effect of improving the rigidity of the polyamide resin composition.

The glass fiber may have a square, circular, or elliptical cross section in a direction perpendicular to the length direction.

In the present description, the cross section of the glass fiber of the cylindrical, cocoon type, flat type, square, circular and elliptical shape is not particularly limited if it is a shape commonly recognized by a person skilled in the art, and these shapes are unclear to those skilled in the art. Does not, and is clearly distinguished.

The glass fiber, for example, may have a length of 1 to 5 mm and a diameter of 5 to 15 μm, and mechanical properties such as impact strength are improved within this range, thereby replacing metals when processing plastic parts such as automobiles. There is an effect that can be done.

As a specific example, the glass fiber may have a length of 2 to 5 mm, preferably 3 to 4 mm, and a diameter of 7 to 13 μm, preferably 9 to 13 μm, and within this range, the rigidity of the resin composition is increased. It works.

The glass fiber has an aspect ratio (L/D) of length (length L of glass fiber)/cross-section (section D of glass fiber), for example, 100 to 400, or 200 to 350, preferably 280 to 310 days In addition, there is an effect of increasing the stiffness of the polyamide resin composition within the above range to replace expensive resins and metals when processing plastic parts such as automobiles.

The cross-section D corresponds to the length of the longest side of the cross-section when the cross-section of the glass fiber is cut perpendicular to the length direction is rectangular, and corresponds to the length of the longest diameter of the cross-section when the cross-section is elliptical.

The length and diameter of the glass fibers are average values, for example, and can be measured with a SEM (scanning electron microscope) or a microscope.

(d) nigrosine

In the present invention, in consideration of the thermal stability of the polyamide resin composition, nigrosine was used as a dye.

The (d) nigrosine is, for example, 0.1 to 10% by weight, or 0.1 to 5% by weight based on the polyamide resin composition. Preferably, it may be included in an amount of 0.1 to 1% by weight, and within this range, mechanical properties such as impact strength are excellent, and in particular, gloss and appearance characteristics are remarkably improved.

(e) pigment

The (e) pigment is, for example, 0.1 to 10% by weight, or 0.1 to 5% by weight based on the polyamide resin composition. Preferably, it may be included in an amount of 1 to 3% by weight, and within this range, mechanical properties such as impact strength are excellent, and in particular, gloss and appearance characteristics are remarkably improved.

It is preferable to use the pigment (e) has excellent heat resistance, weather resistance, and chemical resistance, does not contain heavy metal compounds, and does not seep into various solvents. Examples of the pigment include a black pigment, a white pigment, a yellow pigment, a red pigment, and a blue pigment.

In the present invention, as an example, carbon black may be used as a black pigment. The carbon black of the present invention is not limited as long as it is a carbon black commonly used in the art. For example, one or two or more types may be selected from the group consisting of ketjen black, acetylene black, furnace black, channel black, and combinations thereof.

The carbon black may have an average particle diameter of 10 to 50 nm, 10 to 30 nm, preferably 15 to 20 nm, and within this range, weather resistance and pigment colorability of the resin composition may be improved together with the nigrosine.

The average particle diameter of the present substrate can be measured using a laser diffraction method.

The pigment can be used alone or mixed with a polyamide resin to be used in a master batch type. In this case, the dispersibility of the pigment in the resin composition is improved to improve molding processability and further improve weather resistance and pigment colorability. I can make it.

In a specific example, the master batch is 10 to 30% by weight of carbon black, or 10 to 25% by weight. Preferably it may contain 15 to 25% by weight and 70 to 90% by weight of the polyamide resin, or 75 to 10% by weight, preferably 75 to 85% by weight as a carrier resin, in this case, the pigment in the resin composition By improving the dispersibility, molding processability can be improved, and weather resistance and pigment coloring properties can be further improved.

(f) additive

The polyamide resin composition according to the present invention may further include an additive. As the additive, for example, a heat stabilizer, a UV stabilizer, a lubricant, an antioxidant, a light stabilizer, a release agent, an antistatic agent, a crosslinking agent, an antibacterial agent, a processing aid, a metal deactivator, an antifriction agent, an antiwear agent, and a coupling agent selected from the group consisting of One or more types may be used, but the present invention is not limited thereto, and it may be understood by those skilled in the art that the additives may be used as needed or according to the manufacturer's instructions for use.

The additive may be, for example, 0.1 to 10 parts by weight, 0.1 to 5 parts by weight, or 1 to 5 parts by weight based on the total 100 parts by weight of the compounds (A) to (e), and within this range, the object of the present invention There is an effect of expressing the desired physical properties without inhibiting the.

The polyamide and resin composition can be for example, ASTM D256 by the impact strength measurement of 95 to 140J / m ^2, or of 100 to 130J / m ^2, preferably between 100 and 128J / m ² on the basis of, within this range There is an effect of excellent physical property balance in

The polyamide resin composition may have a flow index of 5 to 20 g/min, or 5 to 15 g/min, preferably 6 to 13 g/min, measured at 260° C. and 5 kg according to ASTM D1238, for example, Within this range, there is an effect of excellent fluidity and excellent physical property balance.

A method of preparing the polyamide resin composition of the present disclosure may include, for example, (a) 16 to 65% by weight of a polyamide resin; (b) 0.01 to 10% by weight of a flow modifier; (c) 31 to 69% by weight of filler; (d) 0.1 to 10% by weight of nigrosine; And (e) extruding after melt-kneading 0.1 to 10% by weight of a pigment, wherein the (b) flow modifier is a dendrimer or a hyperbranched polymer, wherein the terminal functional group is a hydroxyl group, a sulfhydryl group, an amino group, and a carboxyl group. , Characterized in that it is selected from the group consisting of an aldehyde group and an epoxy group.

The melt kneading may be melt-extruded at 240 to 290°C, or 250 to 290°C, preferably at 260 to 280°C, and at 200 to 300 rpm, or 200 to 250 rpm with a twin screw extruder, within this range. Due to the high physical and chemical affinity between components, it has an excellent balance of properties.

The twin-screw extruder, for example, may have a diameter (Φ) of 30 to 45mm, or 35 to 45mm, preferably 37 to 43mm, and a ratio of diameter (L/D) of 20 to 50, or 30 to 45, preferably May be 40 to 54, and within this range, there is an excellent effect of the physical property balance.

The molded article according to the present invention is characterized in that it contains the polyamide resin composition.

The molded article may be used, for example, for an electric/electronic case, an exterior material for an automobile, etc., but is not limited thereto, and may be easily formed by a person having ordinary knowledge in the field to which the present invention belongs.

Hereinafter, a preferred embodiment is presented to aid the understanding of the present invention, but the following examples are only illustrative of the present invention, and it is obvious to those skilled in the art that various changes and modifications are possible within the scope and spirit of the present invention, It is natural that such modifications and modifications fall within the appended claims.

[Example]

Example 1 to 5 and Comparative example 1 to 8

(a) a polyamide resin, (b) a flow modifier, (c) a filler, (d) nigrosine, (e) a pigment and (F) an additive in the amount (% by weight) shown in Table 1 and Table 2 below. (Super mixer) was used to mix, and the strands melt-kneaded at a temperature of 260 to 280°C were pulled out using a twin screw extruder (L/D=42, Φ=40 mm), and the strands were immersed in cooling water to control the temperature. A resin composition in the form of a pellet was prepared.

The prepared pellet-type resin composition was dried at 120° C. for 3 hours, and then molded at an injection temperature of 260° C. and a mold temperature of 80° C. to prepare a specimen, which was left at room temperature (23° C.) at about 60% relative humidity for 48 hours After measuring the physical properties.

Each component of Table 1 and Table 2 is as follows.

*(a) Polyamide resin

(A-1) PA6 with a relative viscosity of 2.3 (KP Chemtech, PAMIDE EN200)

(A-2) PA6 with a relative viscosity of 2.0 (Rodia, Media M2000)

(A-3) PA6,6 with a relative viscosity of 2.7 (Rodia, N66 27AE)

*(b) flow modifier

(B-1) Dendrimer represented by Chemical Formula 2 (Weihai CY Dendrimer Technology company spewi CYD-701)

(B-2) Hyper branched polyesters (Kempia, VCA-1)

*(C) Filler: Surface-treated glass fiber with a diameter of 10 to 13 µm and a chop length of 3 to 4 mm (manufacturer: CPIC, ESC 301HP)

*(D) Nigrosine (NPK, KHM K007D)

*(E) Pigment: 20% carbon black, 80% nylon carrier pigment (MPK, KHM K003)

*(F) Other additives: heat stabilizer, UV stabilizer, lubricant, etc.

[Test Example]

The properties of the specimens prepared with the polyamide resin compositions prepared in Examples 1 to 5 and Comparative Examples 1 to 8 were measured by the following method, and the results are shown in Tables 1 and 2 below.

*Impact strength (IMP, J/m ² ): According to ASTM D256, Izod impact strength was measured using a specimen having a thickness of 1/4".

*Flow index (MFI, g/10min): The melt flow index (MI) was measured at 260°C and 5kg load condition according to ASTM D1238.

* Gloss: The gloss at an angle of 60° was measured using a gloss meter according to ASTM D528.

*Appearance: The appearance of the molded article was evaluated with the naked eye based on the following criteria.

○: No filler lift, △: There is partially lifted filler, ｘ: The lift is severe.

division Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 A-1 47.4 47.2 47.0 46.0 46.8 46 - A-2 - - - - - - 46 A-3 - - - - - - - B-1 0.1 0.3 0.5 - - - - B-2 - - - 0.5 0.7 - - C 50 50 50 50 50 50 50 D 0.5 0.5 0.5 0.5 0.5 - - E One One One 2 One 3 3 F One One One One One One One Properties MFI
(g/10min) 8.5 11.0 12.8 9.0 11.4 6.8 7.5 Gloss 59~76 67~74 70~73 55~70 59~72 21~45 30~46 Exterior ○ ○ ○ ○ ○ ｘ △ IMP
(J/m ² ) 128 120 118 106 100 130 103

division Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 A-1 46 46 - 68 67 27.5 A-2 - - - - - - A-3 - - 47.5 - - - B-1 3 - 0.5 - 0.5 0.5 B-2 - - - - - - C 50 50 50 30 30 70 D - 3 - - 0.5 - E One One One One One One F One One One One One One Properties MFI
(g/10min) 15.3 7.0 6.0 18 21 3.5 Gloss 46~58 50~67 43~58 53~66 56~70 10~32 Exterior △ △ ｘ ○ ○ ｘ IMP
(J/m ² ) 92 113 102 87 85 140

As shown in Tables 1 and 2, in the case of Examples 1 to 5 prepared according to the present invention, mechanical properties such as impact strength and the like are excellent compared to Comparative Examples, and at the same time, fluidity, gloss and appearance are remarkably improved. I could confirm.

On the other hand, (D) in the case of Comparative Examples 3, 5, 6 and 8 containing no nigrosine, it was confirmed that the appearance characteristics and impact strength were poor, and (B) Comparative Examples 1, 2, 4 and without using a flow modifier In the case of 6, it was confirmed that the fluidity, gloss and appearance were remarkably poor compared to the example.

In addition, in the case of Comparative Example 7 using 30% by weight of glass fibers, it was confirmed that the impact strength was significantly lowered.

Claims (16)

(a) 30 to 50% by weight of a polyamide resin;
(b) 0.1 to 1% by weight of a flow modifier;
(c) 40 to 60% by weight of filler;
(d) 0.1 to 5% by weight of nigrosine; And
(e) 0.1 to 10% by weight of a pigment,
The (b) flow modifier is a dendrimer or a hyperbranched polymer, and the terminal functional group is independently selected from the group consisting of a hydroxyl group, a sulfhydryl group, an amino group, a carboxyl group, an aldehyde group and an epoxy group,
The dendrimer is a compound represented by the following formula 2 or 3,
[Formula 2]

[Formula 3]

The (a) polyamide resin is polyamide 6, and the relative viscosity measured in 96% sulfuric acid solvent is 2.1 to 2.6,
The (c) filler is glass fiber,
Polyamide resin composition, characterized in that the impact strength measured according to ASTM D256 95 to 140 J / m ² .
delete delete delete delete delete delete The method of claim 1,
The glass fiber is a polyamide resin composition, characterized in that the length is 1 to 5mm, the diameter is 5 to 15㎛.
The method of claim 1,
The glass fiber is a polyamide resin composition, characterized in that the surface treatment with aminosilane.
The method of claim 1,
The (e) pigment is a polyamide resin composition comprising 10 to 30% by weight of carbon black and 70 to 90% by weight of a polyamide resin.
The method of claim 1,
The polyamide resin composition is 1 selected from the group consisting of a heat stabilizer, a UV stabilizer, a lubricant, an antioxidant, a light stabilizer, a release agent, an antistatic agent, a crosslinking agent, an antibacterial agent, a processing aid, a metal inactivator, an antifriction agent, an antiwear agent, and a coupling agent. Polyamide resin composition, characterized in that it further comprises more than one additive.
delete (a) 30 to 50% by weight of a polyamide resin; (b) 0.1 to 1% by weight of a flow modifier; (c) 40 to 60% by weight of filler; (d) 0.1 to 5% by weight of nigrosine; And (e) melt-kneading 0.1 to 10% by weight of a pigment and then extruding, wherein the (b) flow modifier is a dendrimer or a dendrimer or a hyperbranched polymer, wherein the terminal functional group is independently hydrogenated. It is selected from the group consisting of a hydroxyl group, a sulfhydryl group, an amino group, a carboxyl group, an aldehyde group and an epoxy group,
The dendrimer is a compound represented by the following Formula 2 or 3,
[Formula 2]

[Formula 3]

The (a) polyamide resin is polyamide 6, and the relative viscosity measured in 96% sulfuric acid solvent is 2.1 to 2.6,
The (c) filler is glass fiber,
The polyamide resin composition is a method of producing a polyamide resin composition, characterized in that the impact strength measured according to ASTM D256 is 95 to 140 J / m ² .
The method of claim 13,
The melt-kneading method for producing a polyamide resin composition, characterized in that carried out at 240 to 290 ℃ with a twin screw extruder.
A molded article comprising the polyamide resin composition of any one of claims 1 or 8 to 11.
The method of claim 15,
The molded article, characterized in that the automobile interior and exterior material.