KR20190041429A - Polyamide Resin Composition and Resin Product Comprising the Same - Google Patents

Abstract

The present invention relates to a polyamide resin composition having improved electrical properties and heat resistance as well as eco-friendly flame-retardant properties, and to a resin molded article including the same. The polyamide resin composition of the present invention comprises: a polyamide resin; a polyester resin; and a polymer compatibilizer having at least one reactor.

Description

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

Cross-reference with related application (s)

This application claims the benefit of priority based on Korean Patent Application No. 10-2017-0132739, filed October 12, 2017, the entire contents of which are incorporated herein by reference.

The present invention relates to a polyamide resin composition, and more particularly, to a polyamide resin composition having environmentally friendly flame retardancy while having improved electrical properties and heat resistance.

The polyamide resins represented by nylon 6 and nylon 66 have various characteristics such as mechanical strength, heat resistance, abrasion resistance, and chemical resistance, and are thus attracting attention as materials applicable to various industries.

However, the polyamide resin has a problem that the mechanical properties are deteriorated when water is absorbed for a long time, and the CTI (Comparative Tracking Index), which is one of the electrical characteristics, is relatively inferior.

Further, the melting points of nylon 6 and nylon 66 are relatively low at 230 ° C and 260 ° C, respectively, and thus they have insufficient heat resistance to be applied to semiconductor processing equipment, circuit boards, automobile and aircraft parts.

Studies for solving the above problems have been progressing steadily, and for example, blending with another polymer resin having excellent heat resistance and hardly changing physical properties even at a relatively high humidity has been considered.

However, the polyamide resin has poor compatibility with other polymer resins, and even if blended, it may cause defects in the extrusion process, and the physical properties of the produced polymer resin molded article are likely to fall short of a desired level.

That is, since it is rarely easy for the polyamide resin and the other polymer resin to be compatible with each other easily, it is difficult to obtain a highly compatible polyamide resin while satisfying desired physical properties.

An object of the present invention is to provide a polyamide resin composition which is based on blending of a polyamide resin and a polyester resin and which has excellent compatibility and has an improved electrical property and heat resistance and a low saturated water content, And a polyamide resin composition in which the deterioration of physical properties is prevented.

In order to achieve the above object, the present inventors have found that blending a high heat-resistant thermoplastic polyester resin and a polyamide resin which are excellent in electrical characteristics (CTI) and heat resistance and hardly change physical properties under long-term moisture absorption conditions, The polyamide resin composition was successfully prepared by using a polymer compatibilizing agent having a reactive crosslinking agent with both polyester resins through stable crosslinking of the two resins. And it has been found that there is almost no deterioration of physical properties, and that a low saturated water content, electrical characteristics and heat resistance are greatly improved, thereby completing the present invention.

Hereinafter, the polyamide resin composition according to a specific embodiment of the present invention will be described in more detail.

Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the configurations shown in the embodiments described herein are merely the most preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention, so that various equivalents And variations are possible.

As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. In this specification, the terms " comprising, " " comprising, " or " having ", and the like are intended to specify the presence of stated features, But do not preclude the presence or addition of one or more other features, integers, steps, components, or combinations thereof.

The polyamide resin composition according to one embodiment of the present invention is a polyamide resin composition,

Polyamide resins;

Polyester resin; And

And a polymer compatibilizer having at least one reactor which reacts with both the terminal group of the polyamide resin and the terminal group of the polyester resin,

The weight ratio of the polyester resin to the polyamide resin (= polyester resin / polyamide resin) is 0.01 or more and less than 0.7.

Hereinafter, each component constituting the polyamide resin composition according to one embodiment will be described in detail.

The polyamide resin is not particularly limited, but it may be polyamide 6 or polyamide 66, and the production method thereof is well known in the art and therefore will not be described here.

The polyester resin may be polycyclohexylenedimethylene terephthalate (PCT) resin produced by polycondensation of terephthalic acid and 1,4-cyclohexylene di-methyl alcohol (CHDM) Or a polycyclohexylenedimethylene terephthalate resin modified with isophthalic acid or its anhydride.

The polycyclohexylenedimethylene terephthalate resin has a crystallization speed much faster than that of polyethylene terephthalate (PET), although it is later than polybutylene terephthalate (PBT), has high heat resistance while being capable of injection molding, and has relatively high price competitiveness Potential application possibilities are very high. In addition, the water absorption rate of the polyamide-based polymer is low and the discoloration resistance by heat is excellent.

Accordingly, when the polyamide resin composition according to the present invention contains the polycyclohexylenedimethylene terephthalate resin as the polyester resin, it is possible to provide a polyamide resin composition which has improved heat resistance, The water absorption rate is achieved and the electrical characteristics of the comparative tracking index (CTI), i.e., the ability of the material to withstand a relatively high voltage under the chemical conditions, can be improved.

However, when the ratio of the polycyclohexylenedimethylene terephthalate in the composition ratio of the polyamide and the polycyclohexylene dimethylene terephthalate resin is excessively low, the desired electrical characteristics and heat resistance are not guaranteed and conversely, the excessively high The mechanical properties of the composition, specifically, the tensile strength, the flexural strength, and the impact strength, etc., may be greatly reduced.

Therefore, in the polyamide resin composition according to one embodiment of the present invention, the weight ratio of the polyester resin to the polyamide resin (= polyester resin / polyamide resin) is 0.01 or more to less than 0.7, Ratio is relatively high, preferably 0.2 or more to 0.6 or less, and more preferably 0.25 or more to less than 0.54.

However, the inventors of the present invention have found that the polyamide resin has low compatibility with the polyester resin, so that it is difficult to achieve desired physical properties with the simple blend of the resins, and the processing characteristics of the resin composition are also poor Respectively.

Accordingly, the polyamide resin composition according to one embodiment of the present invention may include a polymer compatibilizer having at least one reactor which reacts with both the terminal group of the polyamide resin and the terminal group of the polyester resin have.

Such a polyamide resin composition has a molecular structure in which the above-mentioned polyester resin and the polyamide resin are connected via a compatibilizer, whereby the lowering of the molecular weight of the polyamide resin composition is suppressed and the physical properties can be maintained in a desired form have.

The polymer compatibilizing agent having the above reactor is a polyester resin, specifically, a glycidyl group capable of reacting with the terminal group of the polycyclohexylenedimethylene terephthalate resin and the terminal group of the polyamide resin to prevent the molecular weight from lowering, Specifically, a methacrylate glycidyl group may be contained as a reactor.

The polymer compatibilizing agent having the methacrylate glycidyl group as a reactor is preferably an unsaturated nitrile-aromatic vinyl-glycidyl (meth) acrylate copolymer, a saturated ethylene-alkyl acrylate-glycidyl methacrylate copolymer, Acrylate-glycidyl methacrylate copolymer, and more specifically styrene-acrylate-glycidyl methacrylate copolymer. The styrene-acrylate-glycidyl methacrylate copolymer may be a styrene-acrylate-glycidyl methacrylate copolymer.

When the polymer compatibilizing agent having the above reactor is included in an excessively low content, it is difficult to realize the desired compatibility, and when the content is too high, the molecular weight increase due to crosslinking during the extrusion process of the polyamide resin composition rapidly Resulting in generation of unnecessary carbides and a problem of poor extrusion process.

Accordingly, in the present invention, the polymer compatibilizing agent having the above reactor is preferably used in an amount of 0.01 to 2.0% by weight, more specifically 0.1 to 1.0% by weight, more specifically 0.3% By weight to 0.7% by weight.

The polyamide resin composition according to one embodiment may further include one or more additives selected from the group consisting of an anti-dripping agent, a flame retardant, an antioxidant, a pigment, a dye and a nucleating agent .

As the dye, materials such as anthraquinone, perinone, and methine may be considered, and any one or a mixture of two or more thereof may be used. When the total amount of the above-mentioned dyes is further included, 0.01 to 2 parts by weight, or 0.01 to 1 part by weight, or 0.01 to 0.5 part by weight, based on 100 of the total weight of the resin composition, may be included .

The antioxidant suppresses the yellowing of the polymer resin, thereby improving the appearance of the polyamide resin composition and the molded article, and suppressing oxidation or pyrolysis. Examples of the antioxidant include a phenol-based antioxidant, a phosphorus-based antioxidant, a sulfur-based antioxidant, a hindered amine-based light stabilizer, and the like, and a compound containing a monomer having a phenolic antioxidant and a phosphorus- Type antioxidant may be used.

As the antioxidant, a mixture of a phenol-based first antioxidant and a phosphorus-based second antioxidant, which are excellent in coloring of the molded article due to heat or oxidation without deterioration in heat resistance, and in preventing property deterioration, may be used. More specifically, A mixture of the first antioxidant and the second phosphorus antioxidant in a weight ratio of 2: 1 to 1: 2, or 1: 1 to 1: 2 may be used.

Examples of the phenolic antioxidant include 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) Bis [3- (3,5-di-tert-butyl-4-hydroxy-benzyl) Phenyl] propionamido] hexane), 1,6-bis [3- (3,5-di (tert-butyldimethylsilyloxy) butyl-4-hydroxyphenyl) propionamido] propane), tetrakis [methylene ((1,1- Methyl-3,5-di-tert-butyl-4-hydroxyhydrocinnamate)] methane) Any one or a mixture of two or more may be used. Commercially available phenolic antioxidants include AO-60 from ADEKA.

Specific examples of the phosphorus-based second antioxidant include phosphoric acid, trimethyl phosphate, triethyl phosphate, triphenyl phosphate, triethylphosphonoacetate, bis (2,6-di-tert- butyl-4-methylphenyl) pentaerythritol Di-phosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol-di-phosphite, bis (2,4- (2,4-di-tert-butylphenyl) pentraerythritol-di-phosphite, and any one or a mixture of two or more thereof may be used. Commercially available phosphorus antioxidants include Irgafos 168 from Basf.

If the content of the antioxidant in the polyamide resin composition is too high, the mechanical properties, particularly the heat resistance, and the like of the polymer resin composition may be lowered. Therefore, when the antioxidant is further included, the total weight of the resin composition is set to 100 0.01 part by weight to 5 parts by weight, or 0.1 part by weight to 1 part by weight, or 0.1 part by weight to 0.5 part by weight, based on this amount.

In addition, the pigments include carbon black, titanium oxide, zinc, zinc sulfide, zinc sulfate, barium oxide, lithopone (lithopone, BaSO ₄ o ZnS), white lead (white lead, 2PbCO ₃ o Pb (OH) _2), Calcium carbonate, and alumina. Any one or a mixture of two or more of them may be used. When the total weight of the resin composition is further included, the pigment may be included in an amount of 0.01 to 5 parts by weight, or 0.1 to 1 part by weight, or 0.1 to 0.5 parts by weight, based on 100 of the total weight of the resin composition .

The nucleating agent functions as a nucleus of crystallization during molding of the resin composition to improve the crystallization rate of the resin composition and to improve the heat resistance and injection moldability of the blended polyester resin composition. Specific examples of the nucleating agent include a mixture of a talc / organometallic salt mixture, a sorbic acid metal salt, a phosphate metal salt, a quinacridone, a calcium carboxylate, a montane metal salt, an amide organic compound, an inorganic nucleating agent boron nitride (boron nitride, boron nitride, or talc. Any one or a mixture of two or more of them may be used. Among them, boron nitride which is an inorganic nucleating agent can be used in consideration of remarkable improvement effect by use of a nucleating agent, and IND-11 of Spear Advanced Material Company can be used in the case of a commercially available inorganic nucleating agent.

When the above-mentioned nucleating agent is further included, it may be contained in an amount of 0.01 to 5 parts by weight, or 0.1 to 1.0 parts by weight, or 0.1 to 0.5 parts by weight, based on 100 of the total weight of the resin composition have.

The flame retardant may be a phosphorus-based flame retardant, and the phosphorus flame retardant is eco-friendly and has an advantage of being excellent in compatibility with a polyamide resin and a polyester-based resin and excellent in fluidity, in place of a halogen-based flame retardant.

The phosphorus flame retardant may include, for example, trimethyl phosphate, triethyl phosphate, triphenyl phosphate (TPP), tricresyl phosphate (TCP), trixylenyl phosphate phosphate, TXP), Resorcinolbis (diphenyl phosphate), RDP, Phenyl diresorcinolphosphate, Bisphenol diphenyl phosphate (BDP), Cr (Phenylenediamine), cresyl diphenyl phosphate, xylenyl diphenyl phosphate, phenyldi (isopropylphenyl) phosphate, triisophenylphosphate, diphenylphosphate Diphenyl Phosphate, Resorcinol di Phosphate, and Aromatic Polyphosphate. Be at least one member selected from the group true luer, but is not limited to these.

Commercially available phosphorus flame retardants include OP-1230 and OP-1240 manufactured by Clariant, and OP-1230 or OP-1240 may be used alone for compatibility of a polyamide resin and a polyester resin , Or a mixture thereof can be used.

The inventors of the present invention have found that when a phosphorus flame retardant suitable for the polyamide resin and a phosphorus flame retardant suitable for the polyester are used in combination, the flame retardancy of the polyamide resin composition is more excellent.

The phosphorus flame retardant may be added in an amount of 5 wt% to 25 wt%, more preferably 10 wt% to 25 wt%, and even more preferably 14 wt% to 22 wt%, based on the total weight of the polyamide resin composition.

The anti-drip agent may be exemplified by silica (also serving as a reinforcing filler), asbestos, and fibrillating-type fluoropolymers.

Examples of the fluorinated polymer include polytetrafluoroethylene, tetrafluoroethylene / hexafluoropropylene copolymer, tetrafluoroethylene / ethylene copolymer, poly (vinylidene fluoride), poly (chlorotrifluoroethylene) A fluorinated polyolefin, and a mixture containing at least one of the above-mentioned antifriction agents.

In addition, as far as commercially available, FS-200 of Nanotek can be considered as a drip inhibitor.

When the total weight of the resin composition is 100, it may be contained in an amount of 0.01 to 5 parts by weight, or 0.1 to 1 part by weight, or 0.1 to 0.5 parts by weight, based on the total weight of the resin composition have.

The polyamide resin composition according to one embodiment of the present invention is a polyamide resin composition,

A phosphorus flame retardant in an amount of 5 wt% to 25 wt%, more specifically 10 wt% to 25 wt%, and more specifically 14 wt% to 22 wt%, based on the total weight of the polyamide resin composition; and

0.1 part by weight to 1.0 part by weight, more specifically 0.1 part by weight to 0.5 part by weight, more specifically 0.1 part by weight to 0.3 part by weight, based on 100 parts by weight of the polyamide resin composition.

The content of the phosphorus flame retardant should be carefully considered because the addition of the phosphorus flame retardant is proportional to the improvement of the flame retardancy. However, the excessive addition of the phosphorus flame retardant causes the mechanical properties of the polyamide resin composition, , Flexural strength, heat resistance, impact strength, and the like.

Therefore, the inventors of the present invention have found that when the phosphorus-based flame retardant is used in a content range of 5 wt% to 25 wt%, as described above, , When the polyamide resin composition had a thickness of 0.4 to 3.0 mm, V-0, which is the highest flame retardancy, was secured, and the above-mentioned mechanical properties were maintained at a level at which commercialization was possible.

Particularly preferably, in the polyamide resin composition according to an embodiment of the present invention, the phosphorus-based flame retardant may be added in an amount of 10 wt% to 25 wt%, more specifically 14 wt% to 22 wt%.

As described above, it is preferable to use a combination of the first phosphorus flame retardant suitable for the polyamide resin and the second phosphorus flame retardant suitable for the polyester, and the content of the first phosphorus flame retardant and the second phosphorus flame retardant The sum may fall within the above-mentioned content range.

In the case of the nucleating agent, the crystallization of the polyamide resin composition according to an embodiment of the present invention is improved, and the flame retardancy and the heat resistance can be improved. However, if the polyamide resin composition is excessively added, , In particular, the impact strength may be lowered.

Therefore, the amount of the nucleating agent is preferably in the range of 0.1 part by weight to 1.0 part by weight, more preferably 0.1 part by weight to 0.5 part by weight, relative to 100 parts by weight of the polyamide resin composition according to one embodiment of the present invention. More specifically 0.1 part by weight to 0.3 part by weight.

According to another embodiment of the present invention, a molded article manufactured using the polyamide resin composition may be provided.

The molded product may be produced by various molding methods such as injection molding, extrusion molding, extrusion blow molding, injection blow molding and profile extrusion molding, and post-processing such as thermoforming using the molding method, Can be obtained by molding.

The specific shape and size of the molded article are not particularly limited, but may be, for example, a shape such as a film, a sheet, a container, or a pellet. The application may include, for example, Interior and exterior parts, electrical and electronic parts including connectors, construction materials, textiles, and sports equipment.

The polyamide resin composition according to the present invention comprises a polyamide resin and a polyester resin and has an improved heat resistance and a high mechanical strength, a low saturated water absorption rate, an improved CTI and an improved electrical property, And a compatibilizer including a reactor for connecting the resin and the polyester resin, which is highly compatible.

Best Mode for Carrying Out the Invention Hereinafter, the function and effect of the present invention will be described in more detail through specific examples of the present invention. It is to be understood, however, that these embodiments are merely illustrative of the invention and are not intended to limit the scope of the invention.

The materials used in the following Examples and Comparative Examples are as follows:

Polyamide-6: 1011BRT from Hyosung Co.

Polyamide 66: Ultramid C31 01 from BASF

Polycyclohexylenedimethylene terephthalate (PCT): SKYPURA 0302 from SK Chemical Co.

Phosphorous Flame Retardant 1: Clariant OP-1230

Phosphorus flame retardant 2: Clariant OP-1240

Commercialization 1: Joncryl 4368C (styrene-acrylate-glycidyl methacrylate copolymer) from BASF Co.,

Phenolic primary antioxidant: ADEKA AO-60

Secondary antioxidant: BASF's Irgafos 168

Anti-drip agent: FS-200 from Han NanoTec Co.

Nucleating agent: IND-11 from Spear Advanced Materials Co., Ltd.

Example 1

To the resin composition consisting of 69.5% by weight of polyamide-66, 30% by weight of polycyclohexylenedimethylene terephthalate (PCT) and 0.5% by weight of compatibilizing agent 1, 0.15 part by weight of a phenolic primary antioxidant, And 0.15 parts by weight of an inhibitor were uniformly kneaded and extruded using a twin-screw kneading extruder (?: 40 mm, L / D = 44) to prepare pellets.

Example 2

A resin composition comprising 63.5% by weight of polyamide-66, 16% by weight of polycyclohexylenedimethylene terephthalate (PCT), 0.5% by weight of compatibilizing agent 1 and 20% by weight of phosphorus flame retarding agent 1 (for nylon) 0.15 part by weight of a secondary oxidation stabilizer, 0.15 part by weight of a phosphorus secondary stabilizer, and 0.20 part by weight of an anti-drip agent were uniformly kneaded and extruded using a twin-screw kneading extruder (Φ: 40 mm, L / D = 44) to prepare pellets.

Example 3

63% by weight of polyamide-66, 16% by weight of polycyclohexylenedimethylene terephthalate (PCT), 0.5% by weight of compatibilizer 1, 16% by weight of phosphorus flame retarding agent 1 (for nylon) 0.15 parts by weight of a phenolic primary oxidation stabilizer, 0.15 parts by weight of a phosphorus-based secondary oxidation stabilizer and 0.20 parts by weight of an antifogging agent were added to a resin composition consisting of 4 wt% And uniformly kneaded and extruded to prepare pellets.

Example 4

63% by weight of polyamide-66, 16% by weight of polycyclohexylenedimethylene terephthalate (PCT), 0.5% by weight of compatibilizer 1, 16% by weight of phosphorus flame retarding agent 1 (for nylon) 0.15 part by weight of a phenolic primary oxidation stabilizer, 0.15 part by weight of a phosphorus-based secondary oxidation stabilizer, 0.20 part by weight of an anti-dripping agent and 0.1 part by weight of a nucleating agent were added to a resin composition consisting of 4% 44) to prepare pellets.

Example 5

, 63% by weight of polyamide-6, 16% by weight of polycyclohexylenedimethylene terephthalate (PCT), 0.5% by weight of compatibilizer 1, 16% by weight of phosphorus flame retardant 1 (for nylon) 0.15 part by weight of a phenolic primary oxidation stabilizer, 0.15 part by weight of a phosphorus-based secondary oxidation stabilizer, 0.20 part by weight of an anti-dripping agent and 0.1 part by weight of a nucleating agent were added to a resin composition consisting of 4% 44) to prepare pellets.

Example 6

A resin composition consisting of 55.5 wt% of polyamide-66, 24 wt% of polycyclohexylenedimethylene terephthalate (PCT), 0.5 wt% of compatibilizing agent 1, and 20 wt% of phosphorus flame retarding agent 1 (for nylon) 0.15 part by weight of a secondary oxidation stabilizer, 0.15 part by weight of a phosphorus secondary stabilizer, and 0.20 part by weight of an anti-drip agent were uniformly kneaded and extruded using a twin-screw kneading extruder (Φ: 40 mm, L / D = 44) to prepare pellets.

Example 7

The resin composition consisting of 63.0 wt% of polyamide-66, 16 wt% of polycyclohexylenedimethylene terephthalate (PCT), 1.0 wt% of compatibilizing agent 1, and 20 wt% of phosphorus flame retarding agent 1 (for nylon) 0.15 part by weight of a secondary oxidation stabilizer, 0.15 part by weight of a phosphorus secondary stabilizer, and 0.20 part by weight of an anti-drip agent were uniformly kneaded and extruded using a twin-screw kneading extruder (Φ: 40 mm, L / D = 44) to prepare pellets.

Comparative Example 1

0.15 part by weight of a phenolic primary oxidation stabilizer and 0.15 part by weight of a phosphorus secondary stabilizer were added to a resin composition consisting of 100% by weight of polycyclohexylenedimethylene terephthalate (PCT) in a twin-screw kneading extruder (Φ: 40 mm, L / D = 44) to prepare pellets.

Comparative Example 2

0.15 part by weight of a phenol-based primary oxidation stabilizer and 0.15 part by weight of a phosphorus-based secondary oxidation stabilizer were uniformly kneaded using a twin-screw kneading extruder (Φ: 40 mm, L / D = 44) to a resin composition comprising 100% by weight of polyamide- To prepare pellets.

Comparative Example 3

0.15 parts by weight of a phenol-based primary oxidation stabilizer and 0.15 parts by weight of a phosphorus-based secondary oxidation stabilizer were uniformly kneaded using a twin-screw kneading extruder (?: 40 mm, L / D = 44) To prepare pellets.

Comparative Example 4

A resin composition consisting of 70% by weight of polyamide-66 and 30% by weight of polycyclohexylenedimethylene terephthalate (PCT) was mixed with 0.15 part by weight of a phenol-based primary oxidation stabilizer and 0.15 part by weight of a phosphorus-based secondary oxidation stabilizer, (陸: 40 mm, L / D = 44) to prepare pellets.

Comparative Example 5

A resin composition comprising 80% by weight of polyamide-66 and 20% by weight of phosphorus-based flame retarding agent 1 (for nylon), 0.15 part by weight of a phenol primary oxidizing stabilizer, 0.15 part by weight of a phosphorus secondary oxidizing stabilizer and 0.20 parts by weight of an anti- Using a kneading extruder (?: 40 mm, L / D = 44), the mixture was uniformly kneaded and extruded to produce pellets.

Comparative Example 6

A resin composition consisting of 64% by weight of polyamide-66, 16% by weight of polycyclohexylenedimethylene terephthalate (PCT) and 20% by weight of phosphorus-based flame retardant 1 (for nylon), 0.15 parts by weight of a phenolic primary oxidation stabilizer, 0.15 part by weight of a phosphorus secondary stabilizer and 0.20 part by weight of an antifogging agent were uniformly kneaded and extruded using a twin screw extruder (?: 40 mm, L / D = 44) to prepare pellets.

Test Example 1: Evaluation of mechanical properties of resin composition

The mechanical properties of the polymeric resin compositions prepared in Example 1, Comparative Example 1 and Comparative Example 2 were evaluated, and the results are shown in Table 1 below.

Example 1 Comparative Example 1 Comparative Example 2 Tensile strength (kgf / cm ² ) 760 314 889 Flexural Strength (kgf / cm ² ) 1012 530 1012 Impact strength (3.2t, J / m) 45 32 45 Heat resistance (18 MPa, `C) 95 102 86

It was confirmed that the comparative example 1 using the polyester resin alone had significantly lower mechanical properties as compared with the example 1 and the comparative example 2 using the polyamide resin alone exhibited almost similar mechanical properties.

Furthermore, it can be seen that the composition of Example 1 significantly improved the heat resistance as compared with Example 1 and Comparative Example 2 in which the compatibilizing agent and polycyclohexylenedimethylene terephthalate (PCT) were not separately added.

Test Example 2: Drop test of resin composition, compatibility, heat resistance, flame retardancy and CTI, evaluation of saturated water content

The properties of the polymeric resin compositions prepared in Examples 2 to 5 and Comparative Examples 1 to 6 were evaluated, and the results are shown in Table 2 below.

Table 2 summarizes the following results.

First, the polyamide resin composition-based molded articles of Examples 2 to 7 including the compatibilizer of the " styrene-acrylate-glycidyl methacrylate copolymer " component were cracked as a result of a drop test Cracks and the like were not generated, and it can be understood that excellent physical properties are inherent based on relatively good compatibility.

On the other hand, drop-test of the molded articles based on the resin compositions of Comparative Example 4 and Comparative Example 6 in which the compatibilizer was not added resulted in obvious defects, which were not satisfied with the desired compatibility, .

Second, the molded articles based on the polyamide resin compositions of Examples 2 to 7 were compared with those of Comparative Examples 2 to 3 composed of a polyamide resin alone or Comparative Example 4 which did not separately contain a compatibilizer, It can be seen that the heat resistance is remarkably improved.

Particularly, in Example 5 and Comparative Example 3 in which direct comparison is possible, it can be confirmed that the resin composition composed of the polyamide-6 resin and the polyester resin has better heat resistance than the polyamide-6 resin alone. It should be noted that in Example 5, the heat resistance was improved despite containing a flame retardant.

Third, it can be seen that the polyamide resin compositions of Examples 2 to 7 have a relatively low saturated moisture content as compared with Comparative Examples 2 and 3 composed of a polyamide resin alone.

As a result, it can be understood that the polyamide resin compositions of Examples 2 to 7 overcome the limitation of the polyamide resin in which mechanical properties are deteriorated when water is absorbed.

Fourth, the polyamide resin compositions of Examples 2 to 4, Examples 6 and 7 have an excellent flame retardant grade, and in particular, the flame retardant 1 for the polyamide resin and the flame retardant for the polyester resin 2 and Example 4, which are added in combination, have the highest flame retardancy.

On the other hand, in the case of Comparative Example 6, the flame retardancy was relatively poor even though the flame retardant was added.

For reference, in Comparative Example 5, excellent flame retardancy was secured, but CTI characteristics and saturated moisture content were poor.

Fifth, in the case of Examples 2 to 4, Examples 6 and 7, it can be seen that CTI characteristics corresponding to the highest grade are possessed. In Comparative Example 5, which can be directly compared with this, the polyester resin In detail, CTI characteristics were not secured due to the absence of polycyclohexylene dimethylene terephthalate resin. In Comparative Example 6, CTI characteristics were secured, but it was found that there was a problem in flame retardancy.

In summary, the polyamide composition comprising a polyamide resin, a polyester resin, and a compatibilizing agent of the " styrene-acrylate-glycidyl methacrylate copolymer " component has a mechanical property similar to that of a well-known polyamide resin While both the heat resistance, the flame retardancy, the CTI characteristics and the saturated moisture content are improved, while the use of the polyester alone, polyamide alone, or the compatibilizer of the " styrene-acrylate-glycidyl methacrylate copolymer & In one composition, all of the above properties are not improved, so that the intended effect of the present invention is difficult to achieve.

Claims (11)

Polyamide resins;
Polyester resin; And
And a polymer compatibilizer having at least one reactor which reacts with both the terminal group of the polyamide resin and the terminal group of the polyester resin,
Wherein the weight ratio of the polyester resin to the polyamide resin (= polyester resin / polyamide resin) is 0.01 or more to less than 0.7. The method according to claim 1,
In the polyamide resin,
Polyamide 6, or polyamide 66. [ The method according to claim 1,
Wherein the polyester resin is a polycyclohexylene dimethylene terephthalate resin. The method according to claim 1,
The polymer compatibilizer having the above reactor is a styrene-acrylate copolymer having a methacrylate glycidyl group as the reactor. The method according to claim 1,
Wherein the polymer compatibilizer having the reactor is 0.01 to 2.0% by weight based on the total weight of the polyamide resin composition. The method according to claim 1,
Wherein the weight ratio of the polyester resin to the polyamide resin is 0.2 or more to 0.6 or less. The method according to claim 1,
Wherein the weight ratio of the polyester resin to the polyamide resin is from 0.25 or more to less than 0.54. The method according to claim 1,
Wherein the polyamide resin composition further comprises any one or two or more additives selected from the group consisting of anti-dripping agents, flame retardants, antioxidants, pigments , dyes, and nucleating agents. 9. The method of claim 8,
The anti-
Wherein the antioxidant comprises a phenol-based antioxidant and a phosphorus-based antioxidant in a weight ratio of 2: 1 to 1: 2. The method according to claim 1,
5% to 25% by weight of a phosphorus-based flame retardant, based on the total weight of the polyamide resin composition, and
Wherein the polyamide resin composition further comprises 0.1 to 1.0 part by weight of a nucleating agent based on 100 parts by weight of the polyamide resin composition. A molded article comprising the polyamide resin composition according to any one of claims 1 to 10.