KR20200077872A - Thermoplastic polyester elastomer resin composition, method for preparing the same and molding products comprising the same - Google Patents

Abstract

The present invention relates to a thermoplastic polyester elastomer resin composition, a method for manufacturing the same, and a molded article comprising the same. More specifically, the present invention relates to: a thermoplastic polyester elastomer resin composition in which a specific combination of a lubricant is mixed with a thermoplastic polyester elastomer resin to effectively attenuate the friction of a material, in particular the thermoplastic polyester elastomer resin composition quickly restores the friction resistance which decreases in severe conditions to effectively inhibit the increase in friction under adverse conditions, and as a result, a friction reduction effect can be kept high continuously; a method for manufacturing the same; and a molded article comprising the same.

Description

Thermoplastic polyester elastomer resin composition and method for manufacturing same, molded article including the same{THERMOPLASTIC POLYESTER ELASTOMER RESIN COMPOSITION, METHOD FOR PREPARING THE SAME AND MOLDING PRODUCTS COMPRISING THE SAME}

The present invention relates to a thermoplastic polyester elastomer resin composition, a method for manufacturing the same, and a molded article containing the same, which can effectively attenuate the friction of the material, and particularly rapidly recover the friction resistance, which is deteriorated in harsh conditions, to continuously reduce the friction. The present invention relates to a thermoplastic polyester elastomer resin composition capable of maintaining high, a manufacturing method thereof, and a molded article containing the same.

Thermoplastic polyester elastomer (TPEE) material is a high value-added product and is widely used in various fields, and the field of use is gradually expanding. Accordingly, there is an increasing need to secure more various physical properties.

In the automotive field, thermoplastic polyester elastomer is used as a constant velocity joint boot (CVJ boots), which is connected to a complex structure and is exposed to high temperature, high pressure, and high vibration environments. Castle, joint improvement, and low noise characteristics are required. In order to satisfy the above requirements, a method of applying a lubricant to a material as a means for reducing friction is typical. However, since the types of lubricants known in the art are very diverse, the combination of the lubricants is quite large, and since the amount of the lubricant can affect the frictional change of the material, there is a need to establish a lubricant formulation very finely suited to the purpose. In other words, it is potentially necessary to study the formulation of a lubricant suitable for an application field and optimizing the amount thereof, in line with the trend of expanding application fields of thermoplastic polyester elastomer materials.

In addition, the conventionally known lubricant combination may secure the initial slip property and reduce friction, but there is a problem that the friction resistance decreases as the driving distance increases, and the friction resistance decreases rapidly depending on external foreign matter inflow or climatic conditions. There was a problem. Therefore, it is necessary to develop a material capable of maintaining improved frictional resistance compared to the prior art, but maintaining high frictional resistance in the long term without deteriorating the frictional resistance even in harsh environments.

International Publication Number 2018/019614 A1

In order to solve the problems of the prior art as described above, an object of the present invention is to provide a thermoplastic polyester elastomer resin composition capable of effectively attenuating friction of a material by mixing a specific combination of lubricant with a thermoplastic polyester elastomer resin.

In addition, an object of the present invention is to provide a method of manufacturing the thermoplastic polyester elastomer resin composition and a molded article containing the same, specifically, a constant velocity joint boot.

In particular, the present invention aims to provide a constant velocity joint boot having better friction resistance than the prior art, and in addition, as an example of a harsh external environment, even when salt water is introduced from the road surface, the friction resistance does not decrease and can be maintained continuously high. It aims at contributing to further improving the quality of the constant velocity joint boots.

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 includes 100 parts by weight of a thermoplastic polyester elastomer resin, 0.3 to 2.5 parts by weight of the first lubricant and 0.3 to 1.5 parts by weight of the second lubricant, wherein the first lubricant comprises ethylene bis oleamide and It is a mixture of a polyester-modified siloxane, and the second lubricant provides a thermoplastic polyester elastomer resin composition comprising at least one compound selected from ethylene bis steramide and fatty acid amide having a melting point of 40 to 50°C. .

In addition, the present invention comprises the steps of melt kneading and extruding, including 100 parts by weight of a thermoplastic polyester elastomer resin, 0.3 to 2.5 parts by weight of the first lubricant and 0.3 to 1.5 parts by weight of the second lubricant, wherein the first lubricant is ethylene bis A thermoplastic polyester elastomer resin composition comprising a mixture of oleamide and polyester-modified siloxane, and the second lubricant comprises at least one compound selected from ethylene bis-steramide and fatty acid amide having a melting point of 40 to 50°C. It provides a method of manufacturing.

In addition, an object of the present invention is to provide a molded article comprising the thermoplastic polyester elastomer resin composition.

The thermoplastic polyester elastomer resin composition according to the present invention can effectively attenuate the friction of the material, and quickly restores the friction resistance, which is significantly lowered, especially in harsh conditions (for example, salt water application and 2 kg load) It is possible to effectively suppress the increase in friction under adverse conditions, and as a result, it is possible to provide an advantage that the friction reducing effect is maintained high for a long time.

Hereinafter, the thermoplastic polyester elastomer resin composition of the present description will be described in detail.

In order to solve the problems of the prior art described above, the present inventors have three lubricants selected from ethylene bis oleamide, ethylene bis steramide, polyester modified siloxane, and fatty acid amide having a melting point of 40 to 50°C in a thermoplastic polyester elastomer resin. When blending, it is possible to effectively attenuate the friction of the material, and it is possible to effectively suppress the increase in friction under adverse conditions by quickly restoring the friction resistance, which is deteriorated in harsh conditions, and to ensure that the excellent friction resistance is maintained high for a long time. And based on this, it was further sold out to complete the present invention.

The thermoplastic polyester elastomer resin composition of the present invention includes, for example, 100 parts by weight of a thermoplastic polyester elastomer resin, 0.3 to 2.5 parts by weight of the first lubricant, and 0.3 to 1.5 parts by weight of the second lubricant, and the first lubricant is ethylene bis-ole It is a mixture of an amide and a polyester-modified siloxane, and the second lubricant may be characterized by comprising at least one compound selected from ethylene bis steramide and fatty acid amide having a melting point of 40 to 50°C, in which case the final molded article It has excellent friction resistance, and effectively suppresses the increase in friction caused by external foreign substances, so that the friction reducing effect can be maintained high for a long time.

Hereinafter, each component constituting the thermoplastic polyester elastomer resin composition of the present description will be described in detail.

Thermoplastic polyester elastomer resin

The thermoplastic polyester elastomer resin is a thermoplastic elastomer comprising an aromatic dicarboxylic acid or an ester-forming derivative thereof and a crystalline hard segment formed from an aliphatic diol, and a soft soft segment formed from a polyalkylene oxide.

The crystalline hard segment and the soft soft segment may be randomly arranged, for example.

The thermoplastic polyester elastomer resin may be, for example, prepared by melt polymerization of an aromatic dicarboxylic acid or an ester-forming derivative thereof, an aliphatic diol, and polyalkylene oxide, and in this case, physical properties such as flexibility, mechanical strength and heat resistance It can provide excellent advantages.

The thermoplastic polyester elastomer resin may be produced by further solid-phase polymerization of the resin produced by the melt polymerization, and in this case, provides an advantage of easy molding.

The aromatic dicarboxylic acid may be, for example, one or more selected from terephthalic acid, isophthalic acid, 2,6-naphthalene dicarboxylic acid, 1,5-naphthalene dicarboxylic acid and 1,4-cyclohexane dicarboxylic acid , Preferably it may be at least one selected from terephthalic acid and isoterephthalic acid.

The ester-forming derivative of the aromatic dicarboxylic acid may be, for example, one or more selected from dimethyl terephthalate, dimethyl isophthalate, 2,6-dimethyl naphthalene dicarboxylate and dimethyl 1,4-cyclohexane dicarboxylate, , Preferably it may be one or more selected from dimethyl terephthalate and dimethyl isophthalate.

The aromatic dicarboxylic acid or its ester-forming derivative may be included in an amount of 25 to 65% by weight based on the total weight of the thermoplastic polyester elastomer resin, preferably 45 to 65% by weight, in which case the physical property balance is It provides excellent advantages.

The aliphatic diol may be, for example, a diol having a number average molecular weight of 300 g/mol or less or 62 to 300 g/mol, preferably ethylene glycol, propylene glycol, 1,2-propanediol, 1,3-propanediol, 1 ,4-butanediol, 1,5-pentanediol, 1,6-hexanediol and 1,4-cyclohexanedimethanol may be at least one selected from, and more preferably 1,4-butanediol.

In the present description, the number average molecular weight of the aliphatic diol can be measured at 40° C. by gel permeation chromatography (GPC) after dissolving the sample in tetrahydrofuran as an example, unless otherwise specified, wherein polystyrene is used as a standard material. Can.

The aliphatic diol may be included, for example, in an amount of 20 to 40% by weight or 25 to 35% by weight based on the total weight of the thermoplastic polyester elastomer resin. In this case, physical properties such as flexibility and mechanical strength are excellent.

The polyalkylene oxide is composed of a soft soft segment of an aliphatic polyester, for example, polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol, polyhexamethylene glycol, copolymers of ethylene oxide and propylene oxide, polypropylene glycol It may be one or more selected from ethylene oxide addition polymers and copolymers of ethylene oxide and tetrahydrofuran, preferably polytetramethylene glycol.

The polyalkylene oxide may be included in an amount of 10 to 50% by weight or 15 to 45% by weight based on the total weight of the thermoplastic polyester elastomer resin, and has excellent flexibility and excellent mechanical strength within this range.

The polyalkylene oxide preferably has a number average molecular weight of 600 to 3000 g/mol or 1000 to 2000 g/mol as an example, and has excellent physical property balance within this range.

Unless otherwise specified in the present description, the number average molecular weight of polyalkylene oxide is measured using gel permeation chromatography (GPC). Specifically, a number average molecular weight was measured using a PL GPC220 instrument of Agilent Technologies using a PL Olexis column of Polymer Laboratories, but the column temperature was 160° C., trichlorobenzene was used as a solvent, and a flow rate of 1.0 ml/min. It was measured by. Samples were prepared at a concentration of 1.0 mg/ml, and then supplied in an amount of 200 μl. The number average molecular weight value was derived based on the calibration curve (corrected by a cubic function) formed using a polystyrene standard.

1st lubricant

The first lubricant is a mixture of ethylene bis oleamide and a polyester-modified siloxane, and in this case, the friction resistance of the material is improved, and at the same time, the ability to reduce the friction resistance by foreign substances such as salt water is quickly restored to maintain a high friction reduction effect. Can.

The first lubricant may be included, for example, 0.3 to 2.5 parts by weight, 0.4 to 2.2 parts by weight, preferably 1 to 2.2 parts by weight based on 100 parts by weight of the thermoplastic polyester elastomer resin, and the friction reducing effect is further within this range. It has an excellent advantage.

The ethylene bis oleamide may be included in an amount of 0.1 to 0.5 parts by weight, 0.2 to 0.4 parts by weight, and preferably 0.2 to 0.3 parts by weight, for example, based on 100 parts by weight of the thermoplastic polyester elastomer resin. It has an excellent advantage.

The polyester-modified siloxane may be included in an amount of 0.1 to 2.2 parts by weight, 0.2 to 2.2 parts by weight, or 1 to 2 parts by weight based on 100 parts by weight of the thermoplastic polyester elastomer resin, and within this range, deterioration of frictional resistance due to foreign substances such as brine The ability to recover quickly and maintain high friction resistance in the long run.

The polyester-modified siloxane is structurally polarized and has excellent compatibility with a polyester elastomer resin.

In the polyester-modified siloxane, for example, the main chain is polydimethylsiloxane, and the organic group of the polydimethylsiloxane is substituted with polyester, polydimethylsiloxane is used as the main chain, and polyester may be included as the side chain. In this case, the compatibility with the polyester elastomer resin is further improved to provide an advantage that the frictional resistance is further improved while maintaining a high physical property balance.

The polyester-modified siloxane may be a polyester-modified siloxane having a hydroxy group at the terminal, and in this case, compatibility with a polyester elastomer resin is more excellent, thereby maintaining a high overall physical property balance and significantly improving friction resistance.

The polyester-modified siloxane may have a melting point of 50 to 55°C or 52 to 55°C, and within this range, there is an advantage of easy compounding with the thermoplastic polyester elastomer resin.

Melting point in the present description can be measured under the condition that the heating rate is 5 to 20 ℃ / min by differential scanning calorimetry as an example unless otherwise specified.

The polyester-modified siloxane may be characterized in that it is in a pellet form, and in this case, it is easy to compound with the thermoplastic polyester elastomer resin, thereby improving productivity.

Second lubricant

The second lubricant includes, for example, at least one compound selected from ethylene bis steramide and a fatty acid amide having a melting point of 40 to 50°C, in which case the composition has a significantly improved friction resistance and a long-term high friction resistance. It provides an advantage.

The second lubricant may be included in an amount of 0.1 to 1.5 parts by weight, 0.3 to 1 part by weight, and preferably 0.6 to 1 part by weight based on 100 parts by weight of the thermoplastic polyester elastomer resin, and in this case, the frictional resistance of the composition is greatly improved. It provides the advantage of being high in friction resistance in the long term.

The ethylene bis-steramide may be included in 0.3 to 1.2 parts by weight, 0.5 to 1.2 parts by weight, or 0.6 to 1 parts by weight based on 100 parts by weight of the thermoplastic polyester elastomer resin, and within this range, the composition has high long-term friction resistance. Can be maintained.

The fatty acid amide having a melting point of 40 to 50° C. may be included in an amount of 0.05 to 0.5 parts by weight or 0.1 to 0.3 parts by weight based on 100 parts by weight of the thermoplastic polyester elastomer resin, and provides excellent friction resistance of the composition within this range.

The melting point of the fatty acid amide may be, for example, 40 to 50°C, 43 to 46°C, or 44 to 45°C, and in this case, it has a relatively low melting point compared to an amide-based lubricant such as ethylene bis oleamide or ethylene bis steramide. Since the speed is large, the initial slip property is secured to provide an effect of reducing friction between materials.

Melting point in the present description can be measured under the condition that the heating rate is 5 to 20 ℃ / min by differential scanning calorimetry as an example unless otherwise specified.

Other additives

The thermoplastic polyester elastomer resin composition of the present disclosure may optionally further contain additives as necessary, and the additives may be, for example, chain extenders, colorants, heat stabilizers, antioxidants, light stabilizers, plasticizers, carbon black, mold release agents, One or more selected from inorganic fillers, nucleating agents, pigments, antistatic agents, crosslinking agents, antibacterial agents, processing aids, metal deactivators, antifriction agents, abrasion resistant agents, flame retardants, and coupling agents may be used, but are not limited thereto.

The additive may be used within a range that does not deteriorate the effect of the present invention, and is preferably included in 0 to 10 parts by weight, 0.01 to 5 parts by weight, or 0.1 to 3 parts by weight based on 100 parts by weight of the thermoplastic polyester elastomer resin. Can.

In a preferred example, the thermoplastic polyester elastomer resin composition may include 100 parts by weight of a thermoplastic polyester elastomer resin; 0.1 to 0.5 parts by weight of ethylene bis oleamide and 0.1 to 2.2 parts by weight of polyester modified siloxane as a first lubricant; And 0.05 to 0.5 parts by weight of a fatty acid amide having a melting point of 40 to 50°C as a second lubricant. In this case, since the diffusion rate of fatty acid amide having a melting point of 40 to 50°C is large, the initial slipping property is secured. It provides an effect of alleviating liver friction, and afterwards, by adding ethylene bis oleamide having a relatively high melting point compared to this, friction is alleviated instead of fatty acid amide lost in initial friction suppression, thereby significantly improving friction resistance compared to the prior art. It can remain high in the long run. The polyester-modified siloxane also contributes to the improvement of frictional resistance, and can provide an advantage that the frictional resistance does not decrease and remains high even in a particularly harsh environment (eg, an environment exposed to salt water, which is an external foreign substance).

As another example, the thermoplastic polyester elastomer resin composition, 100 parts by weight of a thermoplastic polyester elastomer resin; 0.1 to 0.5 parts by weight of ethylene bis oleamide and 0.1 to 2.2 parts by weight of polyester modified siloxane as a first lubricant; And 0.3 to 1.2 parts by weight of ethylene bis steramide as a second lubricant. In this case, the friction resistance is large compared to a conventional resin composition composed of ethylene bis oleamide and ethylene bis steramide as an example of an amide type lubricant combination. It is possible to provide an advantage of being improved and maintaining high friction resistance for a long period of time without deteriorating the friction resistance even in a particularly harsh environment. In addition, in this case, even if the amount of lubricant is increased, there is no blooming phenomenon that the lubricant exudes to the surface of the molded article, and thus the appearance of the product is more excellent.

In another example, the thermoplastic polyester elastomer resin composition may include 100 parts by weight of a thermoplastic polyester elastomer resin; 0.2 to 0.3 parts by weight of ethylene bis oleamide and 1 to 2 parts by weight of polyester-modified siloxane as first lubricant; And 0.5 to 1.2 parts by weight of ethylene bis-steramide as the second lubricant. In this case, it is excellent in friction resistance and has no blooming phenomenon. It can be maintained high for a long period of time without deteriorating friction.

In another example, the thermoplastic polyester elastomer resin composition may include 100 parts by weight of a thermoplastic polyester elastomer resin; 0.2 to 0.3 parts by weight of ethylene bis oleamide and 1 to 2 parts by weight of polyester-modified siloxane as first lubricant; And 0.6 to 1 part by weight of ethylene bis-steramide as the second lubricant. In this case, the friction resistance is more excellent, and the appearance of the final molded product is excellent due to no blooming, and external foreign matter such as brine flows in. The friction resistance is not deteriorated and can be maintained high for a long time.

Hereinafter, a method of manufacturing the thermoplastic polyester elastomer resin composition of the present substrate will be described. The manufacturing method includes all the technical features of the above-mentioned thermoplastic polyester elastomer resin composition, and the description overlapping with the above will be omitted.

The manufacturing method of the thermoplastic polyester elastomer resin composition of the present disclosure includes, for example, melt kneading and extruding, including 100 parts by weight of a thermoplastic polyester elastomer resin, 0.3 to 2.5 parts by weight of the first lubricant, and 0.3 to 1.5 parts by weight of the second lubricant. Including, wherein the first lubricant is a mixture of ethylene bis oleamide and polyester-modified siloxane, and the second lubricant comprises at least one compound selected from ethylene bis steramide and fatty acid amides having a melting point of 40 to 50°C. It can be characterized in that, in this case, the friction resistance is significantly improved compared to the conventional resin composition, it can provide the advantage that the friction resistance is not lowered and maintained high for a long time even in harsh environments.

The melt kneading and extrusion may use an extruder of a type commonly used in the art, and a single screw extruder or a twin screw extruder may be used as a preferred example.

The melt kneading and extrusion is, for example, a temperature range of 200 to 300°C or 210 to 250°C; And it can be performed under a rotational speed of 100 to 600rpm or 200 to 400rpm, within this range is excellent extrusion efficiency and physical properties of the composition.

When melt-kneading, the composition may be prepared by further including one or more of the above-described additives.

The thermoplastic polyester elastomer resin composition obtained through the extrusion may be prepared into pellets, optionally using a pelletizer, if necessary.

Furthermore, the resin composition may be manufactured into molded products in various industrial fields through injection molding.

The molded article of the present substrate may be characterized by including the thermoplastic polyester elastomer resin composition, for example, the molded article may be an automobile part, more preferably a constant velocity joint boot.

The resin composition greatly improves the friction resistance due to the formulation of a specific combination of lubricants, and in particular, the high friction resistance in the long term by rapidly recovering the friction resistance rapidly deteriorating in a harsh environment such as the introduction of foreign substances (components such as calcium chloride for snow removal) Since it can maintain the quality, it can contribute to quality improvement when it is used as a material for constant speed joint boots.

In describing the thermoplastic polyester elastomer resin composition of the present disclosure, a method for manufacturing the same, and a molded article containing the same, other additives not explicitly described, manufacturing process conditions, manufacturing facilities, etc. are within the range generally practiced in the art. It can be appropriately selected from, and is not particularly limited.

Hereinafter, a preferred embodiment is provided to help the understanding of the present invention, but the following examples are merely illustrative of the present invention, and it is apparent to those skilled in the art that various changes and modifications are possible within the scope and technical scope of the present invention. It is no wonder that such variations and modifications fall within the scope of the appended claims.

Materials used in the following examples and comparative examples are as follows.

A) Thermoplastic polyester elastomer resin

A thermoplastic polyester elastomer of LG Chem, which contains polybutylene terephthalate as a hard segment and polytetrapropylene ether glycol as a soft segment, was used.

B) 1st lubricant

B-1) Ethylene bis oleamide: Crobo's EBO product was used.

B-2) Polyester-modified siloxane: A polyester-modified siloxane having a hydroxyl group at the terminal was used, the melting point was 54°C, and a pellet-shaped product (TEGOMER H-Si 6441P from Evonik) was used.

C) Second lubricant

C-1) Ethylene bis-steramide: Croda's EBS product was used.

C-2) Fatty acid amide: Croda's IncroMax 100 product (melting point 44 to 45°C) was used.

[ Example And Comparative example ]

Example 1 to 5 and Comparative example 1 to 3

Blended according to the components and contents shown in Table 1 below, melt-kneaded and extruded using a twin-screw extruder, and pellets were obtained using a pelletizer. The prepared pellets were injected in the form of a disk, and punched to a thickness of 2 mm and a diameter of 2.5 cm to prepare specimens for measuring physical properties.

[ Reference example ]

Reference example One

Using a commercially available DUPONT Hytrel HTR8685 product as a material for manufacturing a constant velocity joint boot of a vehicle, a specimen for measuring physical properties having the same specifications as in Example 1 was prepared.

Reference example 2

A specimen for measuring physical properties of the same standard as in Example 1 was prepared using Arnitel PP7932 manufactured by DSM Engineering Plastics, which is commercially available as a material for manufacturing a constant velocity joint boot of an automobile.

[ Test example ]

The physical properties of the specimens prepared in Examples and Comparative Examples were measured by the following method, and the results are shown in Table 1 below.

Friction resistance evaluation

Pre-treatment of the sample: After preparing two specimens for measuring physical properties prepared as described above, dipping them in a saline solution for more than 1 hour and taking them out and wiping them with a tissue to remove foreign substances and lubricant from the surface. Specifically, the brine solution is an aqueous solution containing Ca(OH) ₂ at a concentration of 10% by weight and CaCl ₂ at a concentration of 10% by weight.

Friction test: A friction test was performed under the condition of 60 rpm, by contacting two identical specimens using the ETC Oven Tribo-Rheometry equipment of TA. It was set to be applied. At this time, the time taken to the onset point, the point at which the torque due to friction rises rapidly, was measured to evaluate the friction resistance. At this time, the longer the time it takes to the onset point, the better the friction resistance of the material.

Melt Index (Unit: g/ 10min )

The melt index of the specimen was measured under a load of 10 kg and 230° C. according to the method specified in the standard ISO1133. (Target value: 5 to 15g/10min)

Tensile elongation (unit: % ) And tensile strength (unit: MPa )

Tensile elongation and tensile strength of tensile specimens were measured using a universal testing machine (manufactured by Zwick's Z020) according to the methods specified in ISO527-1 and 2.

(Tensile elongation target value: 200% or more, Tensile strength target value: 15 MPa or more)

division 1st lubricant Second lubricant Onset point(sec) Melt Index (g/10min) Tensile Elongation (%) Tensile strength (MPa) B-1 B-2 C-1 C-2 Example 1 0.3 0.3 - 0.3 400 8.4 236.5 21.1 Example 2 0.2 One One - 1200 7.4 302.2 24.0 Example 3 0.2 2 0.5 - 343 12.8 261.4 18.4 Example 4 0.2 2 One - 1200 12.5 339.3 22.1 Example 5 0.2 0.2 - 0.1 154 11.3 311.9 22.2 Comparative Example 1 0.2 2 - - 253 8.7 255.3 22.6 Comparative Example 2 - 2 One - One 7.1 348.6 23.5 Comparative Example 3 0.2 - 0.5 - 4 6.4 203.6 17.5 Reference Example 1 unknown 12.1 8.0 - - Reference Example 2 unknown 5.8 14.6 - - B-1) Ethylene Bis Oleamide
B-2) Polyester modified siloxane
C-1) Ethylene bis-steramide
C-2) Melting point 44 to 45°C Fatty acid amide

(In Table 1, the content unit of each lubricant is parts by weight, and is based on 100 parts by weight of the thermoplastic polyester elastomer resin.)

As shown in Table 1, the resin composition of Examples 1 to 5 according to the present invention can be confirmed that the onset point is significantly slower than the comparative example and the reference example as it contains a specific combination of lubricant, from which the conventional composition It can be seen that it provides improved abrasion resistance and can maintain high abrasion resistance even in an environment in which foreign substances such as salt are present.

In addition, when a specific lubricant is used in combination with Examples 2 to 4, while the amount of the lubricant is excessive compared to other examples, the physical properties such as melt index, tensile strength, and tensile elongation are maintained at a high level, but the friction resistance is large compared to the prior art. It can be seen that it shows an improved effect.

In addition, as shown in Table 1, in the case of including the lubricant combination according to the present invention, the friction resistance is significantly improved compared to the prior art, while the level required to be used as a constant velocity joint boots, or higher melt index, tensile elongation and tensile strength It can be confirmed that, although not specifically specified above, it was confirmed that the melt index, tensile elongation and tensile strength are equal to or higher than those of Reference Examples 1 and 2, which are commercially available products.

Continuing to refer to Table 1 above, in the case of Comparative Example 1 in which the polyester-modified siloxane was omitted as the first lubricant, it was confirmed that the onset point time point was significantly shortened compared to Examples 2 and 3, which are equivalent conditions, and as the first lubricant. In the case of Comparative Example 2 in which the ethylene bis oleamide was omitted, it was confirmed that the onset point appeared within 1 second after the friction test, and the friction resistance was significantly lower than that of the Example.

In addition, in the case of Comparative Example 3, which includes a conventionally known lubricant combination, the onset point time point is very short compared to the example and deviates from the object of the present application, except that the polyester-modified siloxane is omitted as the first lubricant. It can be seen that the tensile strength and tensile elongation are inferior despite the fact that the amount of lubricant used is less than 3.

Above all, the present inventor provides a higher level of friction resistance as compared to the prior art, as well as whether it is possible to maintain high friction resistance for a long time and various foreign substances introduced from the outside of the vehicle when used as an actual constant velocity joint boot (for example, brine) In order to prove that the problem of rapidly deteriorating the frictional resistance can be solved, a specimen pretreated with brine was used during the friction test, and a friction test was performed under the harsh conditions of applying a load of about 20N to the specimen. Even under the abrasion resistance, it was confirmed that the result was significantly improved compared to the prior art. From this, it can be predicted that the thermoplastic polyester elastomer resin composition according to the present invention will greatly contribute to improving the quality of the constant velocity joint boots.

Claims (10)

100 parts by weight of a thermoplastic polyester elastomer resin, 0.3 to 2.5 parts by weight of the first lubricant and 0.1 to 1.5 parts by weight of the second lubricant,
The first lubricant is a mixture of ethylene bis oleamide and polyester modified siloxane,
The second lubricant comprises at least one compound selected from ethylene bis steramide and fatty acid amide having a melting point of 40 to 50°C.
Thermoplastic polyester elastomer resin composition. According to claim 1,
The ethylene bis oleamide is characterized in that contained in 0.1 to 0.5 parts by weight based on 100 parts by weight of the thermoplastic polyester elastomer resin
Thermoplastic polyester elastomer resin composition. According to claim 1,
The polyester-modified siloxane is characterized in that contained in 0.1 to 2.2 parts by weight based on 100 parts by weight of the thermoplastic polyester elastomer resin
Thermoplastic polyester elastomer resin composition. According to claim 1,
The ethylene bis-steramide is characterized in that it is included as 0.3 to 1.2 parts by weight based on 100 parts by weight of the thermoplastic polyester elastomer resin
Thermoplastic polyester elastomer resin composition. According to claim 1,
The melting point of 40 to 50 ℃ fatty acid amide is characterized in that it is included as 0.05 to 0.5 parts by weight based on 100 parts by weight of the thermoplastic polyester elastomer resin
Thermoplastic polyester elastomer resin composition. According to claim 1,
The polyester-modified siloxane is characterized in that the melting point is 50 to 55 ℃
Thermoplastic polyester elastomer resin composition. According to claim 1,
The polyester-modified siloxane is characterized in that the pellet form
Thermoplastic polyester elastomer resin composition. According to claim 1,
The polyester-modified siloxane is characterized in that the polyester-modified siloxane having a hydroxyl group at the terminal
Thermoplastic polyester elastomer resin composition. Including 100 parts by weight of a thermoplastic polyester elastomer resin, 0.3 to 2.5 parts by weight of the first lubricant and 0.3 to 1.5 parts by weight of the second lubricant, including melt-kneading and extruding,
The first lubricant is a mixture of ethylene bis oleamide and polyester-modified siloxane, and the second lubricant comprises at least one compound selected from ethylene bis steramide and fatty acid amide having a melting point of 40 to 50°C. doing
Method for producing a thermoplastic polyester elastomer resin composition. It characterized in that it comprises the resin composition of any one of claims 1 to 8
Molded article.