KR101815577B1 - Polyamide based polymer compositions comprising hyperbranched polyamide having enhanced flowability and preparation method thereof - Google Patents

Abstract

The present invention relates to a polyamide-based polymer composition having improved flowability, and a method of preparing the same, wherein the polyamide-based polymer composition has improved flowability by containing, as a rheological modifier in a polyamide-based resin, a linear diamine compound and a hyperbranched polyamide produced from the amide formation between polyfunctional organic acids or organic acid chlorides. According to the present invention, the polyamide-based resin composition can be used in the production process of composite materials using reinforcing fibers such as glass fibers, carbon fibers, or the like to effectively disperse the reinforcing fibers, and due to improved flowability thereof, can be extremely useful in compounding, or extrusion and injection molding of polyamide-based engineering plastics containing a high content of glass fibers.

Description

TECHNICAL FIELD [0001] The present invention relates to a polyamide-based polymer composition having hyperbranched polyamide and an improved flowability of the polyamide-based polymer composition,

The present invention relates to a polyamide-based polymer composition having improved flowability and a method for producing the same.

More particularly, the present invention relates to a polyamide-based polymer composition having improved fluidity by including a hyperbranched polyamide as a flow modifier in a polyamide-based resin, and a method for producing the same.

In recent years, automakers have been making continuous efforts to reduce the weight of automobiles as the automobile fuel efficiency and exhaust emission regulations of governments around the world are strengthened. As a means to reduce vehicle weight, the number of parts is reduced by optimizing design and maximizing parts performance, and the application of lightweight substitute materials such as aluminum, magnesium, engineering plastics, fiber reinforced plastics and fiber reinforced composites. Among these, the application of lightweight substitute materials enables not only the weight reduction of the parts but also the optimum design and integration of parts, thus maximizing the effect of light weight.

Fiber reinforced plastic or fiber reinforced composite material is a general term of composite material reinforced with glass fiber, carbon fiber, aramid fiber and the like using plastic as a matrix. Recently, it is required to have high strength and heat resistance . In recent years, automobile and industrial products have become increasingly high performance and lightweight, and component parts are required to have more precise shapes than before, and performance such as high heat resistance and high rigidity is required.

Polyamide composite materials are excellent materials such as rigidity, toughness and chemical resistance. They are excellent in light weight, impact resistance, thermal expansion coefficient and economical efficiency, so they can be used as alternative materials such as aluminum and steel. It can be up to more than%, not only for automobile exterior use. When applied to internal parts including housings, it is possible to present solutions using advanced materials to the automotive market, which requires weight reduction, design flexibility and ease of molding.

Korean Patent Laid-Open No. 10-2009-0063382, which is related to the polyamide-based composite material as described above, relates to a polyamide-reinforced resin composition, and more particularly, to a TGA analysis at 300 ° C Of not less than 5%, the flowability according to ASTM evaluation method D1238 is not less than 20 g / 10 min, the grayscale after irradiation of 126 MJ / m 2 with an irradiation intensity of 65 W / m 2 by Xenon arc is not less than grade 3, and ASTM evaluation method D790 To have a flexural strength of 1,300 to 3,000 kg / m < 2 >.

However, in order to realize the high performance of polyamide-based composite materials, compounding technique with various reinforcing materials is essential. When a high amount of glass fiber is added, the flowability is not good. When the physical properties are satisfied, Or injection molding process. Since the processability of the polymer is limited by improvement of the monomer, control of the molecular weight and change of the molecular structure, it is necessary to use a flow control agent such as a lubricant which influences the viscosity behavior of the melt do.

Accordingly, the inventors of the present invention have been studying a polymer composition having excellent flowability. When the flow regulator is added to a hyperbranched polyamide as a polyamide resin flow modifier, fluidity of the polymer composition is improved, The present invention has been completed based on the discovery that the mechanical strength of the polymer composite material can be improved.

Korean Patent Publication No. 10-2009-0063382.

The present invention relates to a method for manufacturing a thermoplastic polymer composite material containing reinforcing fibers, which improves the fluidity of the composition in the processing and molding steps of a polymer resin mixed with reinforcing fibers to reduce friction between a molten resin and a processing machine, The goal is to enable effective dispersion of glass fibers.

Accordingly, an object of the present invention is to provide an effective flow control agent capable of lowering the viscosity of a polyamide-based resin, and to provide a polyamide-based composition having improved flowability using the same and a method for producing the same.

In order to accomplish the above object, the present invention provides an improved polyamide-based resin composition comprising a polyamide-based resin as a flow modifier comprising a hyperbranched polyamide produced by an amide formation reaction between a linear diamine compound represented by the following formula A and a compound represented by the following formula The present invention provides a polyamide-based polymer composition having high flowability.

≪ Formula (A)

In the above formula (A), R is an alkyl group having 1 to 15 carbon atoms.

≪ Formula B >

In the above formula (B), X is -OH or -Cl.

The present invention also relates to a process for producing a polyamide-based resin flow control agent, which comprises mixing a hyperbranched polyamide produced by an amide formation reaction between a linear diamine compound represented by the above formula (A) and a compound represented by the above formula (B) A melt-kneading step of producing a melt-kneaded product; And a step of molding the melt-kneaded product. The present invention also provides a method for producing a polyamide-based composition having improved flowability.

The polymer composition according to the present invention is excellent in miscibility or compatibility with polyamide-based polymers using hyperbranched polyamide as a flow regulator, reduces friction between a molten resin and a processing machine and greatly improves fluidity, Based resin composition has the effect of significantly reducing the dispersion of reinforcing fibers and the torque applied to processing equipment in the process of manufacturing composite materials using reinforcing fibers such as glass fiber or carbon fiber.

Further, the polymer composition according to the present invention is a very effective material due to the improved fluidity in compounding, extrusion and injection molding of polyamide engineering plastics containing a high amount of glass fibers.

In addition, according to the present invention, since the flowability during processing is greatly improved by the addition of the flow control agent, uniform mixing of the reinforcing fiber and the polymer resin is induced, so that a polyamide composite material having excellent mechanical strength is produced even under relatively non- can do.

Figure 1 shows FT-IR spectra of hyperbranched polyamides Se-HBPA6, Se-HBPA8 and Se-HBPA12, flow modifiers prepared according to one embodiment of the present invention.
Figure 2 shows the results of differential scanning calorimetry (DSC) of hyperbranched polyamides Se-HBPA6, Se-HBPA8 and Se-HBPA12, flow modifiers prepared according to one embodiment of the present invention.
3 shows the viscosity of the polyamide-based polymer composition according to one embodiment of the present invention.

In the specification of the present invention, the terms or words used in the description and claims of the invention can be suitably defined in order to explain the invention in its best mode, and the term or word conforms to the idea of the invention . In addition, the configurations shown in the embodiments and the like described in the present specification are not specific to the technical idea of the present invention in a specific embodiment of the present invention. Accordingly, at the time of filing of the present invention, there can be various equivalents and modifications that can be substituted for the purpose of the present invention.

As used herein, the term " polyamide based resin " may be a homopolymer or a copolymer. The present invention can use one or more linear or branched polyamides as polyamides. The linear polyamides can be prepared from dicarboxylic acids and diamines, and the branched polyamides can be prepared from monomers that can contain more than two acid groups or amine groups, and thus from the amine and carboxylic acid Can be manufactured.

Examples of polyamides are lactam-derived polycaprolactam, polycaprolactam and polylauroractam having 7 to 13 ring members, or polyamides obtained by reaction of dicarboxylic acid with diamine.

Particularly useful dicarboxylic acids are the alkanedicarboxylic acids having 6 to 12, in particular 6 to 10 carbon atoms, and aromatic dicarboxylic acids, preferably adipic, azelaic, sebacic, dodecanedioic, And the like. Preferred diamines include alkane diamines having 6 to 12, especially 6 to 8 carbon atoms, and also m-xylylenediamine, di (4-aminophenyl) methane, di (4-aminocyclohexyl) methane, 2,2-di (4-aminophenyl) propane, 2,2-di (4-aminocyclohexyl) propane or 1,5-diamino- .

Thus, preferred polyamides are polyhexamethylene adipamide, polyhexamethylene cevacamide and polycaprolactam, and also nylon-6 / 6,6 copolyamides with a caprolactam unit content of 5 to 95% by weight. Other suitable polyamides are those which are obtainable through copolymerization of a mixture of polyamides of any desired mixing ratio or of two or more of the above-mentioned monomers.

Hereinafter, the polyamide-based polymer composition according to the present invention will be described in detail.

In order to achieve the above object, the present invention provides a flow control agent for improving the flowability of a polyamide-based resin, which comprises a hyperbranched poly (meth) acrylate formed by an amide formation reaction between a linear diamine compound represented by the following formula (A) Amide-containing polyamide-based polymer composition.

≪ Formula (A)

In the above formula (A), R is an alkyl group having 1 to 15 carbon atoms.

≪ Formula B >

In the above formula (B), X is -OH or -Cl.

In the polyamide-based polymer composition having improved fluidity according to the present invention, the polyamide-based resin may be a polyamide derived from a lactam, a polyamide obtained through a reaction between a dicarboxylic acid and a diamine, and a copolymerized polyamide And may be one or more polyamides selected.

The hyperbranched polyamide flow modifier used in the present invention preferably has a molecular weight in the range of 0.01 to 0.60 dL / g based on the intrinsic viscosity. When the molecular weight of the flow control agent is more than 0.60 dL / g, the viscosity of the flow control agent is increased, which is not suitable for improving the flowability. When the flow regulator is less than 0.01 dL / g, the viscosity is too low to improve the flowability The physical properties of the final molded product deteriorate, which is not preferable.

The hyperbranched polyamide flow control agent used in the present invention is excellent in miscibility or compatibility with polyamide based resins as compared with conventional flow control agents and has excellent fluidity when mixed with a polyamide based resin Lt; / RTI >

In the polyamide-based polymer composition having improved flowability according to the present invention, the hyperbranched polymer as the flow control agent may exhibit excellent flowability by containing 0.1 to 5 parts by weight based on 100 parts by weight of the polyamide-based resin.

If the amount of the flow control agent is less than 0.1 parts by weight based on the polyamide resin, there is a problem that excellent flowability can not be obtained by adding a flow control agent. When the amount of the flow control agent is more than 5.0 parts by weight, There is a problem in that the mechanical strength of the composite material produced from the mixture of the resin and the reinforcing fibers deteriorates.

When a composite material is produced from a polymer composition exhibiting excellent fluidity, it can be advantageously applied to compounding, extrusion and injection molding of a polyamide engineering plastic containing a high amount of glass fibers.

Specifically, the polymer composition according to the present invention exhibits an effect of decreasing viscosity toward the high-speed shear region, which improves fluidity under actual extrusion and extrusion conditions, thereby reducing the load on the equipment, thereby increasing the service life of the equipment , Lowering production power and output energy, and lowering the overall production cost. At the same time, since the polymer composition according to the present invention has excellent mechanical strength, it can be applied to various fields.

In the polyamide-based polymer composition having improved flowability according to the present invention, the hyperbranched polyamide which is the flow control agent is obtained by reacting a linear alkyl diamine compound with a carboxylic acid or a carboxylic acid chloride ). ≪ / RTI > Preferably a trimesic acid or trimesic acid chloride having three carboxyl groups and a diamine having an alkyl group of 1 to 15 carbon atoms. More preferably, the linear alkyldiamine compound may be diaminohexane, diaminooctane, or diaminododecane.

In the polyamide-based polymer composition having improved flowability according to the present invention, the hyperbranched polyamide which is the flow control agent can be prepared by the reaction represented by the following reaction formula A.

<Reaction Scheme A>

In the above reaction scheme A, R is an alkyl group having 1 to 15 carbon atoms.

Also, the present invention relates to a process for producing a polyamide-based resin flow regulator, which comprises mixing a hyperbranched polyamide produced by amide formation reaction between a linear diamine compound represented by the following formula A and a compound represented by the following formula B with a polyamide- A melt-kneading step of producing a melt-kneaded product; And a step of molding the melt-kneaded product. The present invention also provides a method for producing a polyamide-based composition having improved flowability.

&Lt; Formula (A)

In the above formula (A), R is an alkyl group having 1 to 15 carbon atoms.

&Lt; Formula B >

In the above formula (B), X is -OH or -Cl.

In the method for producing a polyamide-based polymer composition having improved fluidity according to the present invention, the polyamide-based resin is a polyamide obtained by reacting a lactam-derived polyamide, a dicarboxylic acid and a diamine, and a copolymerized polyamide Lt; RTI ID = 0.0 &gt; polyamide &lt; / RTI &gt;

In the process for preparing a polyamide-based polymer composition having improved flowability according to the present invention, the hyperbranched polyamide which is the flow control agent is prepared by reacting a linear alkyldiamine-based compound and at least three organic carboxylic acid or carboxylic acid chloride or by an amide formation reaction with a carboxylic acid chloride. Preferably a trimesic acid or trimesic acid chloride having three carboxyl groups and a diamine having an alkyl group of 1 to 15 carbon atoms. More preferably, the linear alkyldiamine compound may be diaminohexane, diaminooctane, or diaminododecane.

In the process for preparing a polyamide-based polymer composition having improved flowability according to the present invention, the hyperbranched polyamide as the flow control agent can be prepared by the reaction represented by the following reaction formula A.

<Reaction Scheme A>

In the above reaction scheme A, R is an alkyl group having 1 to 15 carbon atoms.

In the process for preparing a polyamide-based polymer composition having improved flowability according to the present invention, the melt-kneading step may be performed at a temperature of 200 to 500 ° C., and the step of producing a molded product using the melt- A molding method can be used.

The molded product manufacturing step may be a step of extrusion molding or injection molding the melt-kneaded product. First, the extrusion molding is preferably performed at a temperature of 200 ° C to 350 ° C. If the extrusion molding is carried out at a temperature lower than 200 ° C, it is difficult to uniformly mix. If the extrusion molding is performed at a temperature higher than 350 ° C, the mechanical properties of the polyamide composite material to be produced decrease, There is a problem that economical efficiency is deteriorated. Meanwhile, in the method for producing a polyamide composite material according to the present invention, the injection molding may be performed by a known method using an apparatus such as an injection molding machine.

Further, the melt-kneading step is not limited as long as it is capable of melting the polyamide-based resin, and may be performed at a temperature of 200 ° C to 500 ° C.

The reinforced fiber may be any one of glass fiber and carbon fiber in the production of a composite material using the polyamide polymer composition having improved fluidity according to the present invention. For effective mixing, Fiber is preferable, and glass fiber is more preferable in view of economy and the like.

It is preferable that 20 to 90% by weight of the polyamide resin composition and 10 to 80% by weight of the reinforcing fiber are blended in the production of the composite material, and 20 to 50% by weight of the polyamide- ; And 50 to 80% by weight of glass fibers.

The polyamide resin composition having improved flowability according to the present invention can be used as a composition for producing a high content of glass fiber reinforced composite material containing 50 wt% or more of glass fiber.

Conventionally, when such a high content of glass fiber is included, productivity and improvement of properties due to breakage of glass fiber have been limited. However, in the polymer composition according to the present invention, the hyperbranched polymer derived from alkyldiaminobenzoate monomer is subjected to flow control The use of zero can exhibit excellent fluidity as well as excellent mechanical strength.

Hereinafter, the present invention will be described in detail with reference to the following Preparation Examples and Examples. However, the following Preparation Examples and Examples are illustrative of the present invention and the scope of the invention is not limited by Examples and Experimental Examples.

The hyperbranched polyamides Se-HBPA6, Se-HBPA8 and Se-HBPA12 according to the present invention are prepared by the reaction represented by the following reaction formula A.

<Reaction Scheme A>

In the above reaction scheme A, R is a hexyl group in the case of Se-HBPA6, Se-HBPA8 is an octyl group, and dodecyl group in the case of Se-HBPA12.

PREPARATION EXAMPLE 1 Synthesis of Hyperbranched Polyamide Se-HBPA6

A 250 mL three-necked flask equipped with a nitrogen passage, a condenser, a magnetic stirrer, and 50 mL of dimethylacetamide (DMAc) containing lithium bromide (LiBr) was charged with 1,3,5-benzenetricarbonyl chloride Diaminohexane (HMDA, 10 mmol) was added to the reaction mixture at 0 ° C for 15 minutes. The mixture was stirred for 1 hour at room temperature, The monomer is dissolved in 50 ml of dimethylacetamide (DMAc) in which lithium bromide (LiBr) is dissolved, and then slowly added for 10 hours using a syringe pump. After stirring for 2 hours, slowly raise the temperature to room temperature, and proceed further for 6 hours. Thereafter, an appropriate amount of trimethylamine is added and precipitated in acetone to obtain a product after filtration. The product was further washed with methanol or acetone after the filter, and vacuum-dried at 120 DEG C for 24 hours to obtain a clean product. The viscosity of the product was 0.12 dL / g (0.5 g / dL in DMSO 30 ° C, Ostwald viscometer).

PREPARATION EXAMPLE 2 Synthesis of Hyperbranched Polyamide Se-HBPA8

A 250 mL three-necked flask equipped with a nitrogen passage, a condenser, a magnetic stirrer, and 50 mL of dimethylacetamide (DMAc) containing lithium bromide (LiBr) was charged with 1,3,5-benzenetricarbonyl chloride 1,8-diaminooctane (1,8-diaminooctane) (OMDA, 5-benzenetricarbonyl chloride, aka trismetic acid chloride) was added to the reaction mixture at 0 ° C for 15 minutes. 10 mmol) is dissolved in 50 ml of dimethylacetamide (DMAc) in which lithium bromide (LiBr) is dissolved, and then slowly added for 10 hours using a syringe pump. After stirring for 2 hours, slowly raise the temperature to room temperature, and proceed further for 6 hours. Thereafter, an appropriate amount of trimethylamine is added and precipitated in acetone to obtain a product after filtration. The product was further washed with methanol or acetone after the filter, and vacuum-dried at 120 DEG C for 24 hours to obtain a clean product. The viscosity of the product was 0.12 dL / g (0.5 g / dL in DMSO 30 ° C, Ostwald viscometer).

PREPARATION EXAMPLE 3 Synthesis of Hyperbranched Polyamide Se-HBPA12

A 250 mL three-necked flask equipped with a nitrogen passage, a condenser, a magnetic stirrer, and 50 mL of dimethylacetamide (DMAc) containing lithium bromide (LiBr) was charged with 1,3,5-benzenetricarbonyl chloride (TMC, 10 mmol), 5-benzenetricarbonyl chloride (aka trismetic acid chloride), and stirred at 0 ° C. for 15 minutes. Then, 1,12-diaminododecane (DMDA , 10 mmol) was dissolved in 50 ml of dimethylacetamide (DMAc) in which lithium bromide (LiBr) was dissolved, followed by slow addition for 10 hours using a syringe pump. After stirring for 2 hours, slowly raise the temperature to room temperature, and proceed further for 6 hours. Thereafter, an appropriate amount of trimethylamine is added and precipitated in acetone to obtain a product after filtration. The product was further washed with methanol or acetone after the filter, and vacuum-dried at 120 DEG C for 24 hours to obtain a clean product. The viscosity of the product was 0.45 dL / g (0.5 g / dL in DMSO 30 ° C, Ostwald viscometer).

1 shows FT-IR spectra of hyperbranched polyamides Se-HBPA6, Se-HBPA8 and Se-HBPA12, flow modifiers prepared according to one embodiment of the present invention. Stretching, aromatic CH stretching at 3000-3100 cm -1, stretching of alkyl at 2850-3000 cm -1, C═O stretching of amide at 1640-1690 cm -1, NH bending of the amide at 1550-1640 cm -1, Identification of the aromatic C = C stretching band at 1400-1600 cm &lt; -1 &gt; confirmed the production of three flow control agents, hyperbranched polyamide.

A solution of 0.5 g / dL of DMSO as a solvent was prepared for each of the hyperbranched polyamides Se-HBPA6, Se-HBPA8 and Se-HBPA12 synthesized in the Production Example, and the intrinsic viscosity The intrinsic viscosity values of 0.12, 0.07 and 0.45 dL / g were obtained, respectively.

Figure 2 shows the results of differential scanning calorimetry (DSC) of hyperbranched polyamides Se-HBPA6, Se-HBPA8 and Se-HBPA12, flow modifiers prepared according to one embodiment of the present invention. Se- Se-HBPA8 exhibited a glass transition temperature (Tg) of 211 ° C. and Se-HBPA 12 exhibited a glass transition temperature (Tg) of 204 ° C. That is, the longer the alkyl group length of the diamine was, the lower the glass transition temperature And a low maintenance ionization temperature can effectively lower the viscosity of the composition during the molding process even at a lower temperature in use as a flow regulator of the polymer.

&Lt; Comparative Example 1 > Preparation of polymer composition

100 wt% of a polyamide resin (Vydyne 21ZLV manufactured by ASCEND) was kneaded for 4 minutes at a temperature of 280 캜 and a screw rotation speed of 80 rpm using a 15 cc microcompounder (DSM Xplore) in the form of a twin screw, Was prepared

&Lt; Comparative Example 2 > Introduction of low viscosity hyperbranched polymer

100 parts by weight of a polyamide-based resin (Vydyne 21ZLV from ASCEND) and 1 part by weight (based on 100 parts by weight of the total polymer composition) of Se-HBPA6 as a flow control agent were uniformly mixed. The intrinsic viscosity of Se-HBPA6 used was 0.005 dL / g.

Then, the mixture was kneaded for 4 minutes at a temperature of 280 DEG C and a screw rotating speed of 80 rpm using a 15 cc microcomposer (DSM Xplore) in the form of a biaxial screw screw, to prepare a polymer composition.

&Lt; Comparative Example 3 > Introduction of high viscosity hyperbranched polymer

100 parts by weight of a polyamide resin (Vydyne 21ZLV manufactured by ASCEND) and 1 part by weight (based on 100 parts by weight of the entire polymer composition) of Se-HBPA12 as a flow control agent were uniformly mixed. The intrinsic viscosity of Se-HBPA12 used was 0.65 dL / g.

Then, the mixture was kneaded for 4 minutes at a temperature of 280 DEG C and a screw rotating speed of 80 rpm using a 15 cc microcomposer (DSM Xplore) in the form of a biaxial screw screw, to prepare a polymer composition.

&Lt; Example 1 >

100 parts by weight of a polyamide-based resin (Vydyne 21ZLV from ASCEND) and 1 part by weight (based on 100 parts by weight of the total polymer composition) of Se-HBPA6 as a flow control agent were uniformly mixed.

Then, the mixture was kneaded for 4 minutes at a temperature of 280 DEG C and a screw rotating speed of 80 rpm using a 15 cc microcomposer (DSM Xplore) in the form of a biaxial screw screw, to prepare a polymer composition.

&Lt; Example 2 >

A polymer composition was prepared in the same manner as in Comparative Example 1 except that 1 phr of Se-HBPA8 (parts by weight based on 100 parts by weight of the whole polymer composition) was used as a flow control agent in Comparative Example 1.

&Lt; Example 3 >

A polymer composition was prepared in the same manner as in Comparative Example 1, except that 1 phr of Se-HBPA 12 (parts by weight based on 100 parts by weight of the whole polymer composition) was used as a flow control agent in Comparative Example 1.

&Lt; Experimental Example > Viscosity reduction rate analysis of polymer composition

The following experiment was conducted to measure the viscosity decrease rate of the polymer composition according to the present invention.

The viscosity of the polymer composition prepared in Comparative Example 1 and Examples 1 to 3 was measured using a capillary viscometer (GOTTFERT Co., RHEOGRAPH25) as compared to Comparative Example 1. The results are shown in FIG. 3, Table 1 summarizes the results.

Polyamide resin
(weight%) Flow regulator
Kinds Intrinsic viscosity
(dL / g) content
(phr) Viscosity reduction rate
(%) Comparative Example 1 100 - - - Comparative Example 2 100 HBPA6 0.005 One - Comparative Example 3 100 HPBA12 0.65 One -3.5 Example 1 100 HBPA6 0.12 One +0.5 Example 2 100 HBPA8 0.07 One +10.6 Example 3 100 HPBA12 0.45 One +15.1

3 shows the viscosity of the polyamide-based polymer composition according to one embodiment of the present invention. As can be seen from FIG. 3, the polymer composition according to one embodiment of the present invention exhibits an effect of decreasing the viscosity toward the high-speed shear region, which improves the fluidity under the actual extrusion and injection conditions, It has a great effect on lowering the overall production cost by lowering production power and output energy. At the same time, since the polymer composition according to the present invention has excellent mechanical strength, it can be applied to various fields.

As shown in Table 1, it can be confirmed that the polymer composition comprising the hyperbranched polyamide as the flow control agent according to the present invention exhibits an effect of decreasing the viscosity. In particular, as the length of the linear diamine chain becomes longer, the viscosity decreases more. This is consistent with the trend of low glass transition temperature of the results of differential scanning calorimetry analyzed above. That is, as the length of the linear diamine chain becomes longer, the glass transition temperature to the hyperbranched polyamide flow control is lowered, which may result in lower viscosity at the same processing conditions, resulting in improved processability.

In addition, a polymer composition containing a low molecular weight hyperbranched polyamide as a flow modifier (as a result of introducing the low-viscosity hyperbranched polymer of Comparative Example 2) had no effect of lowering the melt viscosity and a high molecular weight hyperbranched polyamide (The result of introducing the high-viscosity hyperbranched polymer of Comparative Example 3) exhibited a higher melt viscosity rather than lowering the overall melt viscosity of the polymer composition due to the difficulty of self-molecular behavior.

Accordingly, the polymer composition according to the present invention can be usefully used for compounding, extrusion and injection molding of a polyamide engineering plastic containing a high amount of glass fibers. Further, the addition of the flow control agent according to the present invention As a result, the flowability of the polyamide-based composite material is remarkably improved. Accordingly, it is possible to produce a polyamide-based composite material having excellent mechanical strength even under relatively unfavorable processing conditions.

Claims (8)

An intrinsic viscosity of 0.01 to 0.5 dL / g, which is formed by amide formation reaction between a linear diamine compound represented by the following formula (A) and a polyvalent organic acid or an organic acid chloride represented by the following formula (B) as a flow modifier in a polyamide- Characterized in that the polyamide-based polymer composition comprises hyperbranched polyamide.
&Lt; Formula (A)

In the above formula (A), R is an alkyl group having 1 to 15 carbon atoms.
&Lt; Formula B &gt;

In the above formula (B), X is -OH or -Cl. The method according to claim 1,
Wherein the polyamide-based resin is at least one polyamide selected from the group consisting of a polyamide derived from a lactam, a polyamide obtained through reaction of a dicarboxylic acid with a diamine, and a copolymerized polyamide. Based polymer composition. The method according to claim 1,
Wherein the polyamide-based polymer composition comprises 0.1 to 5 parts by weight of hyperbranched polyamide as a flow control agent based on 100 parts by weight of the polyamide-based resin. The method according to claim 1,
Wherein the hyperbranched polyamide as the flow control agent is prepared by the reaction of the following reaction formula A:
<Reaction Scheme A>

In the above reaction scheme A, R is an alkyl group having 1 to 15 carbon atoms. An intrinsic viscosity of not less than 0.01 dL / g and not more than 0.5 dL / g produced by an amide formation reaction between a linear diamine compound represented by the following formula (A) and a polyvalent organic acid or an organic acid chloride represented by the following formula A melting kneading step of mixing and heating a hyperbranched polyamide with a polyamide-based resin to produce a melt-kneaded product; And
And a step for molding the melt-kneaded product. The method for producing a polyamide-based composition having improved flowability comprises:
&Lt; Formula (A)

In the above formula (A), R is an alkyl group having 1 to 15 carbon atoms.
&Lt; Formula B &gt;

In the above formula (B), X is -OH or -Cl. The method of claim 5,
Wherein the polyamide-based resin is at least one polyamide selected from the group consisting of polyamides derived from lactam, polyamides obtained through reaction of dicarboxylic acid with diamine, and copolymerized polyamides. Lt; / RTI &gt; The method of claim 5,
Wherein the hyperbranched polyamide as the flow control agent is prepared by the reaction of the following reaction formula A:
<Reaction Scheme A>

In the above reaction scheme A, R is an alkyl group having 1 to 15 carbon atoms. Claim 5
Wherein the melt-kneading step is performed at a temperature of 200 to 500 ° C.

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