KR102491341B1 - 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 preparing the same, and a molded article including the same, and more particularly, by adding a specific salt water resistant agent under a lubricant prescription, the salt water resistance is improved while maintaining the existing physical properties, thereby increasing the initial tensile strength and elongation characteristics It relates to a thermoplastic polyester elastomer resin composition that provides the advantage of maintaining a high level for a long period of time even under an environment exposed to salt water, a method for manufacturing the same, and a molded product including the same.

Description

Thermoplastic polyester elastomer resin composition and method for producing the same, and molded products including the same

The present invention relates to a thermoplastic polyester elastomer resin composition, a method for preparing the same, and a molded product including the same, and a thermoplastic polyester elastomer resin composition having improved salt water resistance while maintaining existing physical properties by adding a specific salt water resistant agent under a lubricant prescription, a method for preparing the same, and It relates to a molded article comprising the same.

In the automobile field, conventionally, cross-linked rubber molded by adding a vulcanizing agent to natural rubber or synthetic rubber has been used as a main material, but recently, cross-linked rubber parts are being replaced with plastic products due to demands for light weight and eco-friendliness. Therefore, the utilization of thermoplastic elastomer materials with low specific gravity, good processability and recyclability is increasing.

Constant Velocity Joint Boots (CVJ boots) for automobiles are parts connected to complex structures and exposed to environments of flexibility, high temperature, high pressure and high vibration. bonding, adhesion, and heat resistance at the same time, the material is smooth, and low noise, salt water resistance, and grease resistance are required.

The thermoplastic polyester elastomer corresponds to one of the material groups that can satisfy these required properties. In order to apply this to CVJ boots, a lubricant is essentially prescribed to reduce friction and noise in a high-pressure and high-vibration environment during compounding, which has a problem in that saltwater resistance is reduced.

Therefore, when compounding thermoplastic polyester elastomer, it is required to develop a material capable of improving salt water resistance while prescribing a lubricant.

Korean Patent Publication 2008-0061628 A

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 having improved salt water resistance while maintaining high existing physical properties by adding a specific salt water resistant agent under a lubricant prescription.

In addition, an object of the present invention is to provide a method for preparing the thermoplastic polyester elastomer resin composition and a molded product including the same.

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

In order to achieve the above object, the present invention includes 100 parts by weight of thermoplastic polyester elastomer resin, 0.05 to 1 part by weight of a chain extender, 0.1 to 1 part by weight of a lubricant, and 1 to 4.3 parts by weight of a salt water resistant agent, wherein the salt water resistant agent A thermoplastic polyester elastomer resin composition characterized in that it is a polyester-modified siloxane is provided.

In addition, the present invention includes the step of extruding including 100 parts by weight of thermoplastic polyester elastomer resin, 0.05 to 1 part by weight of a chain stabilizer, 0.1 to 1 part by weight of a lubricant, and 1 to 4.3 parts by weight of a salt water resistant agent, wherein the salt water resistant agent is poly It is an object of the present invention to provide a method for producing a thermoplastic polyester elastomer resin composition characterized in that it is an ester-modified siloxane.

Another object of the present invention is to provide a molded article characterized by comprising the thermoplastic polyester elastomer resin composition.

The thermoplastic polyester elastomer resin composition according to the present invention provides the advantage of improved salt water resistance while securing friction resistance and low noise characteristics as a specific salt water resistant agent is added under a lubricant prescription, and in particular, the initial tensile strength and elongation characteristics are exposed to salt water It provides the advantage of being kept high for a long time even under the environment, and can provide physical properties suitable for manufacturing constant velocity joint boots.

1 is a photograph showing the shape of a specimen manufactured according to an embodiment of the present invention.
2 is a photograph showing the appearance and surface of a specimen in a normal state and a specimen according to Comparative Example 3;

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

In order to solve the above-mentioned problems of the prior art, the inventors of the present invention, when compounding including a thermoplastic polyester elastomer resin and a lubricant, when adding polyester-modified siloxane as a salt water resistant agent within a specific range, friction resistance, wear resistance, and low noise characteristics It was confirmed that the saltwater resistance was improved while keeping the back high, and the problem of saline resistance degradation due to the conventional lubricant prescription was resolved, and based on this, further efforts were made to complete the present invention.

The thermoplastic polyester elastomer resin composition of the present invention comprises, for example, 100 parts by weight of the thermoplastic polyester elastomer resin, 0.05 to 1 part by weight of a chain extender, 0.1 to 1 part by weight of a lubricant, and 1 to 4.3 parts by weight of a salt water resistant agent. However, the salt water-resistant agent may be characterized in that it is a polyester-modified siloxane, and in this case, it provides an advantage that salt water resistance is improved under the formulation of a lubricant.

Hereinafter, each constituent component constituting the resin composition of the present disclosure will be described in detail.

Thermoplastic Polyester Elastomer Resin

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

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

For example, the thermoplastic polyester elastomer resin may be prepared by melt polymerization of an aromatic dicarboxylic acid or an ester-forming derivative thereof, an aliphatic diol, and a polyalkylene oxide. It can provide great benefits.

The thermoplastic polyester elastomer resin may be prepared by further solid-state polymerization of the resin prepared by the melt polymerization, and in this case, the balance of physical properties such as flexibility, mechanical strength and heat resistance is excellent, while providing further excellent moldability. .

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

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

The aromatic dicarboxylic acid or its ester-forming derivative may be included in 25 to 65% by weight, preferably 45 to 65% by weight, based on the total weight of the thermoplastic polyester elastomer resin, and the reaction is within this range. It is excellent in balance, so it is easy to react and provides the advantage of excellent physical property balance.

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, and preferably ethylene glycol, propylene glycol, 1,2-propanediol, 1,3-propanediol, 1 It may be at least one selected from 4-butanediol, 1,5-pentanediol, 1,6-hexanediol, and 1,4-cyclohexanedimethanol, and more preferably 1,4-butanediol.

In this description, unless otherwise specified, 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, at which time 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, and the reaction may proceed smoothly within this range, and physical properties such as flexibility and mechanical strength The balance is excellent.

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

The polyalkylene oxide preferably has a number average molecular weight of, for example, 600 to 3000 g/mol or 1000 to 2000 g/mol, and within this range, a thermoplastic polyester elastomer resin having a stable polymerization reaction and excellent physical property balance can be obtained. there is.

Unless otherwise specified, the number average molecular weight of the polyalkylene oxide may be measured at 40° C. by gel permeation chromatography (GPC) after dissolving the sample in tetrahydrofuran, for example, unless otherwise specified. In this case, polystyrene is used as a standard material. can

The thermoplastic polyester elastomer resin may have a melt index (230° C., 10 kg) of, for example, 1 to 10 g/10 min or 3 to 8 g/10 min, and has excellent moldability within this range.

Unless otherwise specified in this description, the melt index can be measured under the condition of 230 ° C. and a load of 10 kg according to the method specified in ASTM D1238.

The thermoplastic polyester elastomer resin may have, for example, a Shore D hardness of 30 to 50 or 35 to 45, and within this range, the composition has excellent flexibility and mechanical strength.

Shore D hardness can be measured according to the method specified in ASTM D2240 unless otherwise specified in the present description.

chain extender

A chain extender is added to the thermoplastic polyester elastomer resin composition of the present disclosure to secure durability and heat resistance of the composition, and the chain extender is, for example, 0.05 to 1 part by weight, 0.1 to 0.7 part by weight based on 100 parts by weight of the polyester elastomer resin. It is included in parts by weight or 0.2 to 0.5 parts by weight, and the moldability of the composition can be improved without adversely affecting the resin composition within this range.

The chain extender may be, for example, 2,2'-(1,3-phenylene) bis(2-oxazoline) [2,2'-(1,3-phenylene) bis(2-oxazoline)] , In this case, the molecular weight can be increased, and the moldability can be improved by increasing the melt viscosity.

lubricant

The thermoplastic polyester elastomer resin composition of the present substrate includes a lubricant to secure friction resistance, abrasion resistance, and low noise characteristics, and the lubricant is 0.1 to 1 part by weight, 0.3 to 0.8 weight part based on 100 parts by weight of the polyester elastomer resin. part, 0.5 to 0.8 parts by weight or 0.3 to 0.6 parts by weight, and within this range, friction resistance, wear resistance and low noise characteristics can be implemented without adversely affecting the physical properties of the composition.

The lubricant may include, for example, an amide-based lubricant.

The amide-based lubricant is, for example, stearamide, behanamide, ethylene bis steramide [ethylene bis (stearamide)], ethylene bis 12-hydroxy steramide [N, N'-ethylene bis (12-hydroxy stearamide)], erucamide, oleamide, and the like.

As another example, the lubricant may include an amide-based lubricant and Croda's Incroslip SL product. In this case, friction resistance, abrasion resistance, and low noise characteristics may be implemented without adversely affecting physical properties of the composition.

As a specific example, the lubricant is a mixture of 0.3 to 0.6 parts by weight of ethylene bis 12-hydroxy steramide and 0.2 to 0.5 parts by weight of Croda Incroslip SL based on 100 parts by weight of the polyester elastomer resin; or 0.4 to 0.6 parts by weight of ethylene bis steramide; in this case, the resin composition has excellent friction resistance, wear resistance and low noise characteristics.

salt water resistant

The thermoplastic polyester elastomer resin composition of the present description contains 1 to 4.3 parts by weight and 1.5 to 4.3 parts by weight of a salt water resistant agent based on 100 parts by weight of the thermoplastic polyester elastomer resin for the purpose of improving the problem of deterioration in salt water resistance due to the formulation of a lubricant. , 2 to 4 parts by weight or 3 to 4 parts by weight is added, and within this range, salt water resistance can be improved without adversely affecting the physical properties of the composition.

The salt water-resistant agent may be characterized in that it is a polyester-modified siloxane, which is structurally polar and has excellent compatibility with the polyester elastomer resin, so it can contribute to improving salt water resistance while maintaining high basic physical properties of the composition. .

The polyester-modified siloxane may include, for example, a main chain of polydimethylsiloxane, an organic group of the polydimethylsiloxane may be substituted with polyester, and may include polydimethylsiloxane as a main chain and polyester as a side chain. In this case, the compatibility with the polyester elastomer resin is further improved, providing an advantage of improving salt water resistance while maintaining a high balance of physical properties of the composition.

The polyester-modified siloxane may be a polyester-modified siloxane having a hydroxyl group at the terminal. In this case, the compatibility with the polyester elastomer resin is more excellent, so that the salt water resistance can be greatly improved while maintaining the overall physical property balance at a high level.

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 in that compounding with the thermoplastic polyester elastomer resin is easy.

Melting point in the present description can be measured by, for example, differential scanning calorimetry unless otherwise specified.

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

As another example, Evonik's TEGOMER H-Si-6441P product can be used as a salt water-resistant agent, and in this case, the salt water resistance improvement effect is more excellent.

Other Additives

The thermoplastic polyester elastomer resin composition of the present substrate may optionally further include additives as needed, and the additives include, for example, colorants, light stabilizers, heat stabilizers, antioxidants, plasticizers, carbon black, release agents, inorganic fillers, and nucleating agents. , Pigments, antistatic agents, crosslinking agents, antibacterial agents, processing aids, metal deactivators, anti-friction agents, anti-wear agents, flame retardants, coupling agents may be used, but is not limited thereto.

The additives may be used within a range that does not degrade the effect of the present invention, and as a preferred example, 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 one example, the additive may be a heat stabilizer, and in a preferred example, the heat stabilizer may be an inorganic heat stabilizer. In this case, there is an advantage in that the heat stability is improved without adversely affecting the physical properties of the composition.

The inorganic thermal stabilizer may be, for example, at least one selected from copper iodide and potassium iodide.

The inorganic heat stabilizer may be included in an amount of, for example, 0.05 to 0.3 parts by weight, 0.1 to 0.2 parts by weight, preferably 0.1 to 0.15 parts by weight, and within this range, the composition has excellent physical property balance and provides the advantage of improving thermal stability. do.

Hereinafter, a method for preparing the thermoplastic polyester elastomer resin composition of the present substrate will be described. The manufacturing method includes all the technical features of the thermoplastic polyester elastomer resin composition described above, and thus, overlapping descriptions above will be omitted.

The method for producing the thermoplastic polyester elastomer resin composition of the present disclosure includes, for example, 100 parts by weight of the thermoplastic polyester elastomer resin, 0.05 to 1 part by weight of a chain extender, 0.1 to 1 part by weight of a lubricant, and 1 to 4.3 parts by weight of a salt water resistant agent by extrusion. The salt water resistance agent may be a polyester-modified siloxane, and in this case, the salt water resistance is improved even under the formulation of a lubricant.

For the extrusion, a type of extruder commonly used in the art may be used, and a single screw extruder or a twin screw extruder may be used as a preferred example.

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

The thermoplastic polyester elastomer resin composition obtained through the extrusion may be selectively formed into pellets as needed using a pelletizer.

Furthermore, the resin composition can be manufactured into molded articles 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, and for example, the molded article may be an automobile part, more preferably a constant velocity joint boot.

The molded article provides physical properties suitable for constant velocity joint boots by including the resin composition of the present disclosure having improved salt water resistance while having wear resistance, friction resistance, and low noise characteristics due to the formulation of a lubricant.

In describing the thermoplastic polyester elastomer resin composition of the present disclosure, its manufacturing method, and molded products including the same, other additives not explicitly described, manufacturing process conditions, manufacturing equipment, etc. are within the range commonly practiced in the art. It can be appropriately selected from, and it is specified that it is not particularly limited.

Hereinafter, preferred embodiments are presented to aid understanding of the present invention, but the following examples are merely illustrative of the present invention, and various changes and modifications are possible within the scope and spirit of the present invention. It is obvious to those skilled in the art, It goes without saying that these 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

Using polybutylene terephthalate as a hard segment and polytetramethylene ether glycol as a soft segment, LG Chem's BT2140DK1 product with a melt index (230 ℃, 10 kg) of 5.6 g/10min and a shore D hardness of 39 did

B) chain extender

2,2'-(1,3-phenylene) bis(2-oxazoline) (hereinafter referred to as '1,3-PBO') was used.

C) lubricant

C1) Ethylene bis 12-hydroxy steramide (hereinafter referred to as 'EBHS')

C2) Croda Incroslip SL product

C3) ethylene bis steramide (hereinafter referred to as 'EBS')

D) salt water resistant

A polyester-modified siloxane having a hydroxyl group at the terminal was used, and a pellet-type product (TEGOMER H-Si-6441P, manufactured by Evonik) having a melting point of 54° C. was used.

E) Other additives

As an inorganic heat stabilizer, 0.1 part by weight of copper iodide (CuI) and 0.05 part by weight of potassium iodide (KI) were added.

[ Example and comparative example ]

The ingredients and contents shown in Table 1 were blended, and extruded using a twin-screw extruder (SMPLATEK's TEK20) (extrusion conditions: 230 ° C., 300 rpm), and pellets were obtained using a pelletizer. The prepared pellets were injected into a square disk with a thickness of 2 mm (injection condition: 230 ° C, injection speed 70 mm / min), and a dumbbell-shaped specimen (manufactured according to the type 2 standard specified in ISO 37) was prepared for measuring physical properties. The shape of the specimen is shown in Figure 1. In FIG. 1, the left side of the arrow is an injection-molded product in the form of a square disk with a thickness of 2 mm, and the right side of the arrow is a dumbbell-shaped specimen manufactured therefrom.

A B C1 C2 C3 D E Example One 100 0.2 0.5 0.3 - 2.0 0.1/0.05 Example 2 100 0.2 - - 0.5 2.0 - Example 3 100 0.2 - - 0.5 4.0 - comparative example One 100 0.2 0.5 0.3 - - 0.1/0.05 comparative example 2 100 0.2 0.5 0.3 - 0.5 0.1/0.05 comparative example 3 100 0.2 - - 0.5 5.0 -

(In Table 1, the unit of content of each component is parts by weight, and the contents of components B to E are based on 100 parts by weight of component A.)

[ test example ]

The physical properties of the specimens prepared in the Examples and Comparative Examples were measured by the following method, and the results are shown in Table 2 and FIG. 2 below. 2 is a photograph showing the comparison of the surface state of a specimen prepared with the same composition as in Comparative Example 3 with that of a specimen in a normal state.

* elongation and tensile strength

Elongation at break (unit: %) of the dumbbell-shaped specimen prepared as described above using a universal testing machine under the condition of a tensile speed of 5 cm / min under a temperature of 23 ° C and a humidity of 50% according to the method specified in ISO 37 and tensile strength (unit: MPa) were measured.

* Salt water resistance

For salt water resistance, immerse a dumbbell-shaped specimen in an autoclave containing an aqueous solution of CaCl ₂ with a concentration of 25% by weight, store it at a temperature of 100 ° C for 2 weeks, and measure elongation and tensile strength at 1 week intervals in the same manner and conditions as above Based on this, elongation and tensile strength retention were calculated and analyzed. The higher the retention rate, the higher the elongation and tensile strength, which means that the initial measurement value is maintained without deterioration, and therefore, it can be determined that it has strong resistance to salt water.

Properties Early ^a 1 week
lapse retention rate 1 ^b
[%] 2 weeks
lapse retention rate 2 ^c
[%] Example One Tensile strength [Mpa] 19.1 17.1 89.1 14.5 75.5 Elongation [%] 268.3 241.9 90.2 226.0 84.2 Example 2 Tensile strength [Mpa] 20.4 17.3 85.0 14.2 69.7 Elongation [%] 262.8 274.3 104.4 213.6 81.3 Example 3 Tensile strength [Mpa] 17.3 15.9 92.4 13.5 78 Elongation [%] 217.2 229.3 105.6 194.3 89.5 comparative example One Tensile strength [Mpa] 19.7 17.0 86.1 14.2 71.7 Elongation [%] 255.9 252.7 98.7 195.4 76.3 comparative example 2 Tensile strength [Mpa] 19.4 16.9 87.1 14.1 72.6 Elongation [%] 250.6 245.7 98.0 196.8 78.5 comparative example 3 Tensile strength [Mpa] 15.2 - - - - Elongation [%] 180.3 - - - -

(In Table 1, the initial tensile strength and elongation ^a indicate the tensile strength and elongation of the specimen measured before being immersed in salt water, and the retention rate 1 ^b is the ratio of elongation and tensile strength after 1 week of measuring salt water resistance to initial elongation and tensile strength is calculated as a percentage, and the retention rate ^2c is calculated as a percentage of the ratio of elongation and tensile strength after 2 weeks of measurement of salt water resistance to initial elongation and tensile strength.)

Referring to Table 2, it can be seen that Examples 1 to 3 in which the lubricant and the salt water-resistant agent were prescribed according to the present invention showed higher retention of tensile strength and elongation compared to Comparative Example 1 in which the salt water-resistant agent was not prescribed, and in the first week As the second week progressed, it was confirmed that the retention rate of tensile strength and elongation was more excellent than that of the comparative example, and it could be confirmed that the problem of deterioration in salt water resistance due to the conventional lubricant formulation could be effectively improved.

Specifically, comparing the results of Example 1 and Comparative Example 1, it can be seen that the tensile strength and elongation retention rate at 2 weeks of Example 1, in which 2 parts by weight of the salt water resistant agent was prescribed, were high, and the salt water resistance was improved, and Examples 2 and 3 From the above, it can be seen that the tensile strength and elongation retention at 2 weeks are further improved when the content of the salt water-resistant agent is increased from 2 parts by weight to 4 parts by weight.

In addition, looking at the results of Comparative Example 2, when a small amount of 0.5 parts by weight of the salt water resistant agent is applied, the effect of improving the salt water resistance is very weak compared to Comparative Example 1 in which the salt water resistant agent is not prescribed, and other conditions except for the prescribed amount of the salt water resistant agent are equivalent. Compared to Example 1, it was confirmed that the salt water resistance was inferior.

On the other hand, FIG. 2 is a photograph showing the appearance and surface of a specimen in a normal state and a specimen according to Comparative Example 3. Referring to this, the square disk specimen of Comparative Example 3 containing an excessive amount of salt water-resistant agent is excessively bent compared to the specimen in a normal state. You can check what is bad. 2, the surface of the specimen of Comparative Example 3 is uneven due to phase separation, and the surface of the specimen looks white due to a blooming phenomenon that seeps into the specimen surface due to the excessive use of lubricant and salt water. there is.

In addition, it can be confirmed that the initial tensile strength and elongation of Comparative Example 3 are very poor compared to Examples 2 and 3 where the conditions are equivalent except for the prescription amount of the salt water resistant agent due to the above appearance and surface condition defects, and the salt water resistance evaluation is it was impossible

Claims (11)

100 parts by weight of a thermoplastic polyester elastomer resin, 0.05 to 1 part by weight of a chain extender, 0.1 to 1 part by weight of a lubricant, and 1 to 4.3 parts by weight of a salt water resistant agent,
The salt water-resistant agent is a polyester-modified siloxane,
Characterized in that the lubricant comprises an amide-based lubricant
A thermoplastic polyester elastomer resin composition. According to claim 1,
The polyester-modified siloxane is characterized in that the melting point is 50 to 55 ℃
A thermoplastic polyester elastomer resin composition. According to claim 1,
The polyester-modified siloxane is characterized in that the pellet form
A thermoplastic polyester elastomer resin composition. According to claim 1,
Characterized in that the polyester-modified siloxane is a polyester-modified siloxane having a hydroxyl group at the terminal.
A thermoplastic polyester elastomer resin composition. delete According to claim 1,
The thermoplastic polyester elastomer resin is characterized in that the melt index (230 ℃, 10kg) of 1 to 10g / 10min
A thermoplastic polyester elastomer resin composition. According to claim 1,
Characterized in that the thermoplastic polyester elastomer resin has a Shore D hardness of 30 to 50
A thermoplastic polyester elastomer resin composition. According to claim 1,
Characterized in that the chain extender is 2,2'-(1,3-phenylene) bis(2-oxazoline) [2,2'-(1,3-phenylene) bis(2-oxazoline)]
A thermoplastic polyester elastomer resin composition. According to claim 1,
The composition further comprises 0.05 to 0.3 parts by weight of an inorganic heat stabilizer
A thermoplastic polyester elastomer resin composition. 100 parts by weight of a thermoplastic polyester elastomer resin, 0.05 to 1 part by weight of a chain extender, 0.1 to 1 part by weight of a lubricant, and 1 to 4.3 parts by weight of a salt water resistant agent, and extruding the mixture,
The salt water-resistant agent is a polyester-modified siloxane, characterized in that the lubricant includes an amide-based lubricant
Method for producing a thermoplastic polyester elastomer resin composition. Characterized in that it comprises the composition of any one of claims 1 to 4 and 6 to 9
molding.

Images