KR101671903B1 - Thermoplastic elastomer composition for glass run and method of manufacturing the same - Google Patents

Abstract

More particularly, the present invention relates to a thermoplastic elastomer composition for glass run, and more particularly, to a thermoplastic elastomer composition containing an EPDM rubber and a polypropylene, To a thermoplastic elastomer composition for glass run capable of realizing weight reduction and profitability improvement of a product by weight reduction of 30% or more and further improving fuel consumption of an automobile, and a method of manufacturing the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic elastomer composition for glass run,

More particularly, the present invention relates to a thermoplastic elastomer composition for glass run, and more particularly, to a thermoplastic elastomer composition containing an EPDM rubber and a polypropylene, To a thermoplastic elastomer composition for glass run capable of realizing weight reduction and profitability improvement of a product by weight reduction of 30% or more and further improving fuel consumption of an automobile, and a method of manufacturing the same.

BACKGROUND ART Automobile glass run is a thin rod shape attached to a portion of a car door frame that contacts with a windshield, and serves as a guide when the windshield is moved up and down. In addition to maintaining airtightness and watertightness between the glass and the frame, it also absorbs the vibration of the window when driving or when the door is closed, thereby preventing noise and providing comfort and comfort for the automobile. Nylon is attached to the surface or urethane-based resin is coated to improve the adhesion to the window, and it is an automobile part that prevents freezing in cold regions.

Conventionally, Korean Patent Laid-Open Publication No. 2014-0049615 discloses a flame retardant thermoplastic elastomer composition obtained by mixing a rubber copolymerized with two or more? -Olefin components and a polypropylene having a high melt index having a long-chain branch. However, I do not know at all.

In recent years, demands for new technologies and new materials development have been gradually increasing for the purpose of customer's various emotional needs, light weight, high quality, and environment friendliness. In this respect, research on automobile light- need.

Korean Patent Publication No. 2014-0049615

In order to solve the above-mentioned problems, the present invention relates to a thermoplastic elastomer composition comprising a microcapsule foaming agent added to a conventional thermoplastic elastomer containing EPDM rubber and polypropylene and micro foamed to have a strength, durability and weather resistance similar to those of conventional thermoplastic elastomers The inventor of the present invention has realized that the light weight of the product can be realized by reducing the weight.

Accordingly, an object of the present invention is to provide a thermoplastic elastomer composition for glass run capable of reducing the weight of a product such as strength and durability.

Another object of the present invention is to provide a method for producing a thermoplastic elastomer composition for glass run capable of improving the fuel economy of an automobile.

The present invention relates to a thermoplastic resin composition comprising 100 parts by weight of a matrix resin comprising 30 to 70% by weight of ethylene propylene diene monomer and 30 to 70% by weight of polypropylene, 5 to 50 parts by weight of a microcapsule blowing agent, 5 to 30 parts by weight of a light stabilizer; And an inorganic filler in an amount of 20 to 50 parts by weight per 100 parts by weight of the thermoplastic elastomer composition.

The present invention also provides a method for producing a thermoplastic elastomer composition for glass run, comprising the step of mixing 5 to 50 parts by weight of a microcapsule blowing agent with 100 parts by weight of a matrix resin comprising 30 to 70% by weight of ethylene propylene diene monomer and 30 to 70% , 5 to 30 parts by weight of a light stabilizer; And 20 to 50 parts by weight of an inorganic filler to prepare a mixture; And extruding the mixture at an extrusion temperature of 200 to 220 DEG C at a rate of 80 to 120 RPM. The thermoplastic elastomer composition for glass run according to claim 1,

In the thermoplastic elastomer composition for glass run according to the present invention, microcapsule foaming agent is added to a thermoplastic elastomer containing a conventional EPDM rubber and polypropylene, and the microstructure is foamed to have strength, durability and weather resistance similar to those of conventional thermoplastic elastomers, Weight reduction of the weight of the product or more, the improvement of the weight and profitability of the product can be realized, and the fuel efficiency of the automobile can be further improved.

1 is a photograph showing a cross-section (a) of a conventional glass run and a cross-section (b) of a micro-expanded glass run according to the present invention.

Hereinafter, the present invention will be described in more detail with reference to one embodiment.

The thermoplastic elastomer composition for glass run of the present invention comprises 100 parts by weight of a matrix resin containing 30 to 70% by weight of ethylene propylene diene monomer and 30 to 70% by weight of polypropylene, 5 to 50 parts by weight of a microcapsule blowing agent, 5 to 30 parts by weight of a light stabilizer; And 20 to 50 parts by weight of an inorganic filler.

Generally, glass run has a structure of a hard part, a base part and a soft part, and is made of a thermoplastic elastomer composition. The hard part is coated on the base part and the soft part to be used as a material for improving abrasion resistance, the soft part serves as a shape maintaining and supporting part, and the base part serves as a sealing function by the elasticity of the rubber.

In the thermoplastic elastomer composition for glass run, a microcapsule blowing agent is added to a thermoplastic elastomer containing a conventional EPDM rubber and polypropylene to micro-foam the entire glass run, thereby achieving weight reduction of the product by weight reduction of 30% or more compared to the conventional solid thermoplastic elastomer .

According to a preferred embodiment of the present invention, the ethylene propylene diene monomer (EPDM) may contain from 30 to 70% by weight of the matrix resin. Specifically, when the content is out of the above range, the elasticity of the product may be deteriorated. Also, the EPDM rubber preferably has a pattern viscosity of 80 or more at 125 DEG C, and preferably contains 8 to 20 wt% of 5-ethylidene-2-norbornene (ENB)

According to a preferred embodiment of the present invention, the polypropylene may be an olefinic thermoplastic elastomer, which is a high crystalline block copolymer having a melt flow index of 0.1 to 0.3 (230 DEG C, 2.16 kg). Polypropylene having such a melt index is advantageous for cell formation upon foaming. If the content of the polypropylene is less than 30% by weight, formation of the foamed cells is insignificant. If the content of the polypropylene is more than 70% by weight, the melt strength of the polypropylene resin is low, It is preferable to select the above range.

According to a preferred embodiment of the present invention, the microcapsule foaming agent is composed of a core-shell structure, the shell portion is made of acrylonitrile (AN Copolymer) Can be made of iso-octane, isopentane or a mixture of both, which are unsaturated hydrocarbons. The microcapsule blowing agent is different from a general chemical blowing agent which is formed by foaming due to a pressure drop instantaneously, which is thermally expanded inside the extruder by heat and pressure and is discharged to the outer die of the extruder. The content of the blowing agent may vary depending on the size of the extruder and the temperature condition of the microcapsule blowing agent, which may affect the foaming and the weight loss of the product. In addition, the core portion of the microcapsule blowing agent may be formed by softening the shell portion by heat in the form containing iso-octane, isopentane, or both of the unsaturated hydrocarbons in a liquid state, and the foaming agent is vaporized, Expanding type physical foaming agent in which the capsule foaming agent expands. The shell portion controls expansion or contraction of the core (foaming agent) below or below the foaming initiation temperature of the core (foaming agent) and may be expanded and expanded to a predetermined size and used as a high temperature foaming agent of the thermoplastic resin.

According to a preferred embodiment of the present invention, as the content of the microcapsule foaming agent is increased, there is a weight loss effect. Preferably, 5 to 50 parts by weight of the microcapsule foaming agent is used relative to 100 parts by weight of the matrix resin. Specifically, when the content is less than 5 parts by weight, the formation of the foamed cells may be insignificant. If the content is more than 50 parts by weight, it may act as a factor for increasing the cost of the product. mustache) is excessive, molding of the product may be difficult. In addition, durability and abrasion resistance may be deteriorated due to weight loss due to excessive foaming.

According to a preferred embodiment of the present invention, the microcapsule blowing agent may have an average particle size of 1 to 20 μm. Specifically, if the average particle size is less than 1 탆, uniform dispersion is difficult. If the average particle size is larger than 20 탆, the size of the foamed cell is uneven, and there may be a problem in target weight loss and product molding.

According to a preferred embodiment of the present invention, the inorganic filler may be calcium carbonate having an average particle size of 1 to 10 μm. Specifically, the amount of the inorganic filler is preferably 20 to 50 parts by weight based on 100 parts by weight of the matrix resin. When the content is less than 20 parts by weight, a path for expanding by the foaming agent is reduced, . On the other hand, when the amount is more than 50 parts by weight, the specific gravity of the product increases, and the foamed cells can be formed non-uniformly.

The light stabilizer may be a benzotriazole type UV absorber, a Hindered Amine Light Stabilizer (HALS), or a mixture of the two. The light stabilizer is preferably used in an amount of 5 to 30 parts by weight based on 100 parts by weight of the matrix resin. Specifically, when the amount of the light stabilizer is less than 5 parts by weight, surface whitening and fine cracks occur due to UV attack. When the amount is more than 30 parts by weight, the light stabilizer having a low molecular weight is transferred to the surface, ) May occur.

According to a preferred embodiment of the present invention, 0.2 to 1.0 part by weight of an antioxidant, 0.2 to 1.0 part by weight of a crosslinking agent, 0.2 to 1.5 parts by weight of a crosslinking auxiliary, 0.5 to 3.0 parts by weight of a polypropylene wax, To 100 parts by weight.

According to a preferred embodiment of the present invention, the antioxidant is selected from the group consisting of tetrakis (3,5-di-tert-butyl-4-hydroxyphenyl) propionate ) propionate, tetrakis- (3-dodecylthiopropionate), or a mixture of the two. The antioxidant is preferably used in an amount of 0.2 to 1.0 part by weight based on 100 parts by weight of the matrix resin. Specifically, if the content is less than 0.2 part by weight, the physical properties of the composition may be deteriorated. If the content is more than 1.0 part by weight, a product may be blooming.

According to a preferred embodiment of the present invention, the crosslinking agent is 2,5-dimethyl-2,5-di- (tertiarybutylperoxy) -hexane having a half-life temperature of 170 DEG C as a peroxide crosslinking agent, 2,5-di- (tert-butylperoxy) -hexane). When the content of the crosslinking agent is less than 0.2 parts by weight, the crosslinked rubber particles exist in a heterogeneous continuous phase, which is disadvantageous to the uniform foaming performance. When the content of the crosslinking agent is 1.0 If it is more than 100 parts by weight, the polypropylene chain may be broken to form an open cell structure.

According to a preferred embodiment of the present invention, the cross-linking assistant is selected from the group consisting of N, N'-m-phenylenedimaleimide, 1,2-polybutadiene, Can be used. The crosslinking aid is preferably used in an amount of 0.2-5 parts by weight based on 100 parts by weight of the matrix resin. When the content is less than 0.2 parts by weight, the effect on the effect of use is insignificant. When the amount is more than 1.5 parts by weight, May cause fish eye on the surface of the product, which may cause problems in the appearance of the product.

According to a preferred embodiment of the present invention, the polypropylene-based wax can be used to improve the surface slip property and the abrasion resistance of the product. The amount of the polypropylene wax is preferably 0.5 to 3.0 parts by weight based on 100 parts by weight of the matrix resin. If the content of the polypropylene wax is less than 0.5 parts by weight, the effect of improving the scratch resistance is insufficient, If there is more than one part, it may be transferred to the surface of the product and there may be problems in implementation of characteristics.

According to a preferred embodiment of the present invention, the process oil improves the processability of the composition, and the type of the process oil is not particularly limited, but it is preferable to use a high viscosity paraffinic oil. The process oil is preferably used in an amount of 60 to 100 parts by weight based on 100 parts by weight of the matrix resin. When the content of the process oil is less than 60 parts by weight, flowability during extrusion molding is poor, If it is more than 100 parts by weight, the melt strength may be lowered and cell collapse phenomenon may occur.

On the other hand, in the process for producing a thermoplastic elastomer composition for a glass run of the present invention, 100 parts by weight of a matrix resin containing 30 to 70% by weight of ethylene propylene diene monomer and 30 to 70% by weight of polypropylene, 5 to 30 parts by weight of a light stabilizer; And 20 to 50 parts by weight of an inorganic filler to prepare a mixture; And extruding the mixture at an extrusion temperature of 200 to 220 DEG C at a rate of 80 to 120 RPM.

According to a preferred embodiment of the present invention, the extrusion temperature is preferably 200 to 220 ° C. If the temperature is lower than 200 ° C, the weight loss is difficult and the moldability of the outer appearance of the product is deteriorated. Can be lowered.

According to a preferred embodiment of the present invention, the extrusion speed is preferably 80 to 120 RPM. If the extrusion speed is lower than 80 RPM, the appearance of the product is poor. If the extrusion speed is higher than 120 RPM, Due to the lowering of the shearing force, the materials are not melted and the molding of the product is not performed well.

According to a preferred embodiment of the present invention, 0.2 to 1.0 part by weight of an antioxidant, 0.2 to 1.0 part by weight of a crosslinking agent, 0.2 to 1.5 parts by weight of a crosslinking auxiliary, 0.5 to 3.0 parts by weight of a polypropylene wax, 60 to 100 parts by weight of the oil may be further mixed.

Therefore, in the thermoplastic elastomer composition for glass run according to the present invention, the microcapsule foaming agent is added to the thermoplastic elastomer containing the conventional EPDM rubber and polypropylene, and the micro foam is foamed to have strength, durability and weather resistance similar to those of the conventional thermoplastic elastomer Weight reduction of 30% or more and improvement of profitability of the product can be realized, and the fuel efficiency of the automobile can be further improved.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by the following Examples.

Examples 1 to 3 and Comparative Examples 1 to 3

A thermoplastic elastomer composition for automobile glass run was prepared with the components and contents shown in Table 1 below. Further, the composition was prepared by an extrusion molding method according to a general manufacturing method known in the art.

[Components]

1) EPDM rubber: KEP-2480, KEP

2) Polypropylene: BP2000, Korean Oil Company

3) Crosslinking agent: 2,5-dimethyl-2,5-di- (tertiarybutylperoxy) -hexane [Luperox 101-50D, Atochem]

4) Crosslinking aid: N, N'-m-phenylene dimaleimide [TAC-50, DEGUSA]

5) Foaming agent: p, p'-oxybis (benzene-sulfonylhydrazide) [EE188E, EIWA]

6) Microcapsule blowing agent (average particle size 5 ~ 10 ㎛): The core part is isoctenoic unsaturated hydrocarbon and the shell part is made of acrylonitrile copolymer [MSH-990MB, MATSUMOTO]

7) Light stabilizer: benzotriazole type UV absorber, HALS [BASF]

8) Antioxidant: tetrakis (3,5-di-tertiary-butyl-4-hydroxyphenyl) propionate [S1010,

9) Inorganic filler: calcium carbonate [S1000 Rexem]

10) Polypropylene wax: [500 series, Lion Chemtech]

11) Paraffin oil: [KL900B, SJC]

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 EPDM rubber 65 65 65 65 65 65 Polypropylene 35 35 35 35 35 35 Cross-linking agent 0.8 0.8 0.8 0.8 0.8 0.8 Crosslinking auxiliary 0.4 0.4 0.4 0.4 0.4 0.4 Microcapsule foaming agent 10 20 30 - - - blowing agent - - - 10 20 30 UV stabilizer 9 9 9 9 9 9 Antioxidant 0.2 0.2 0.2 0.2 0.2 0.2 Polypropylenic wax 0.3 0.3 0.3 0.3 0.3 0.3 Inorganic filler 20 20 20 20 20 20 Paraffinic oil 70 70 70 70 70 70

Examples 4 to 7 and Comparative Examples 4 and 5

A thermoplastic elastomer composition for automobile glass run was prepared with the components and contents shown in Table 2 below. The composition was prepared by dry blending the additives into the compound (TPV).

[Components]

1) TPV: [80RY, HS material]

2) Microcapsule blowing agent: average particle size is 5 ~ 10 ㎛

3) General capsule blowing agent: average particle size is 30 ~ 40 ㎛

division Example 4 Example 5 Example 6 Example 7 Comparative Example 4 Comparative Example 5 TPV (parts by weight) 100 100 100 100 100 100 Microcapsule foaming agent (parts by weight) 3 5 7 10 - - General capsule blowing agent (parts by weight) - - - - - 10 Extrusion temperature (캜) 210 210 210 210 210 210 Extrusion speed (RPM) 100 100 100 100 100 100

Examples 8 to 10 and Comparative Examples 6 to 9

A thermoplastic elastomer composition for automobile glass run was prepared with the components and experimental conditions shown in Table 3 below. The composition was prepared by dry blending the additives into the compound (TPV).

division Example 8 Example 9 Example 10 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Extrusion temperature (캜) 200 210 220 160 170 180 190 Extrusion speed (RPM) 100 100 100 100 100 100 100 TPV (parts by weight) 100 100 100 100 100 100 100 Microcapsule foaming agent (parts by weight) 10 10 10 10 10 10 10

Examples 8 to 10 and Comparative Examples 6 to 9

A thermoplastic elastomer composition for automobile glass run was prepared from the components and experimental conditions shown in Table 4 below. The composition was prepared by dry blending the additives into the compound (TPV).

division Comparative Example 10 Example 9 Comparative Example 11 Comparative Example 12 Extrusion temperature (캜) 210 210 210 210 Extrusion speed (RPM) 50 100 150 200 (MAX) TPV (parts by weight) 100 100 100 100 Microcapsule foaming agent
(Parts by weight) 10 10 10 10

Experimental Example 1: Evaluation of physical properties

The properties of the thermoplastic elastomer composition for glass run prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were measured by the following test method and the results are shown in Table 5 below.

[Property measurement test]

1) Abrasion resistance: The test was conducted under conditions of a speed of 50 rpm / min and a friction distance of 130 mm using a cotton cloth as a friction cloth at a load of 1 kgf.

2) Product texture: Tested according to Hyundai Kia Automobile spec MS261-27.

3) Cell size: Measured using SEM (electron microscope, model: S2400, HITACHI). (Evaluation results were evaluated as very good (?), Good (?), Normal (?) And X (not good).

4) Specific Gravity: The specific gravity was measured at room temperature (23 ° C) according to the ASTM D-792 measurement method using a specific gravity meter.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Abrasion resistance ○ ○ ○ △ △ △ Product appearance ○ ◎ ○ X X X Foaming rate
(% Weight loss) 30% ↓ 31% ↓ 38% ↓ 20% ↓ 22% ↓ 20% ↓ Cell Size (탆) 50 to 80 10 to 30 30 to 60? 120-180 120-180 150 ~ 180

According to the results shown in Table 5, the compositions of Examples 1 to 3 containing the microcapsule foaming agent were found to have similar abrasion resistance and appearance to the conventional ones. In addition, the foaming ratio (weight loss) of 30% or more was exhibited as compared with Comparative Examples 1 to 3 using a general foaming agent, and it was confirmed that the weight of the product could be reduced and the cell size was small and densely micro foamed.

Experimental Example 2: Evaluation of Physical Properties of Capsule Foaming Agent According to Particle Size

The physical properties of the capsular foaming agent according to the particle size of the thermoplastic elastomer composition for glass run prepared in Examples 4 to 7 and Comparative Examples 4 and 5 were measured in the same manner as in Experimental Example 1, 6.

division Example 4 Example 5 Example 6 Example 7 Comparative Example 4 Comparative Example 5 Product appearance ○ ○ ○ ○ ○ X Foaming rate
(% Weight loss) 35% ↓ 42% ↓ 48% ↓ 49% ↓ - 41% ↓ Cell Size (탆) 30 to 50 30 to 50 10 to 30 10 ~ 30 ↓ - 120-180

According to the results shown in Table 6, the comparative example 5 using the general capsule blowing agent had poor formability due to poor appearance of the product and a cell size of 100 탆 or more, while the microcapsule foaming agent having a small average particle size It can be confirmed that the compositions of Examples 4 to 7 are excellent in appearance of the product, and that the cell size is small and densely micro foamed. Thus, when a microcapsule foaming agent having a small average particle size is used, the thermoplastic elastomer is excellent in physical properties such as strength and durability, and at the same time, the weight of the product can be maximized by reducing the specific gravity of 30% or more.

Experimental Example 3: Evaluation of physical properties according to extrusion temperature

The properties of the thermoplastic elastomer composition for glass run prepared in Examples 8 to 10 and Comparative Examples 6 to 9 were measured according to the extrusion temperature in the same manner as in Experimental Example 1 and the results are shown in Table 7 .

division Example 8 Example 9 Example 10 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Product appearance ○ ○ ○ X X △ △ Foaming rate
(% Weight loss) 45% ↓ 49% ↓ 44% ↓ 15% ↓ 17% ↓ 23% ↓ 39% ↓ Cell Size (탆) 10 to 30 10 to 30 20 to 50 100 to 150 100 to 150 60 to 90 30 to 50

According to the results shown in Table 7, when microcellular foaming was carried out under the same conditions of the microcapsule foaming agent content and extrusion speed, in Comparative Examples 6 to 9 where the extrusion temperature was 160 to 190 ° C, In Examples 8 to 10, in which the temperature was 200 to 220 占 폚, excellent appearance and foaming rate were secured and fine results were obtained in cell size.

Experimental Example 4: Evaluation of physical properties according to extrusion speed

The physical properties of the thermoplastic elastomer composition for glass run prepared in Example 9 and Comparative Examples 10 to 12 were measured in the same manner as in Experimental Example 1. The results are shown in Table 8 below.

division Comparative Example 10 Example 9 Comparative Example 11 Comparative Example 12 Product appearance △ ◎ △ X Foaming rate
(% Weight loss) 40% ↓ 49% ↓ 47% ↓ 53% ↓ Cell Size (탆) 30 to 50 10 to 30 10 to 30 10 to 30

According to the results of Table 8, when the microcellular foaming was performed under the same conditions of the microcapsule foaming agent content and the extrusion temperature, the appearance of the product, the foaming ratio, and the cell size were excellent in Example 9 in which the extrusion rate was 100 RPM. On the other hand, in Comparative Examples 10 and 12, in which the extrusion speeds were 50, 150, and 200 RPM, respectively, the appearance of the product was poor, and in particular, in Comparative Example 12 having an extrusion speed of 200 RPM, Due to the lowering of the shear force of the screw, the materials were unmelted and the unformed product occurred.

1 is a photograph showing a cross-section (a) of a conventional glass run and a cross-section (b) of a micro-expanded glass run according to the present invention. 1 (b) is a cross-sectional view in which the inner surface is small and densely micro-expanded, while the entire glass run of the present invention is micro-expanded It is lightweight.

Therefore, in the thermoplastic elastomer composition for glass run according to the present invention, the microcapsule foaming agent is added to the thermoplastic elastomer containing the conventional EPDM rubber and polypropylene, and the micro foam is foamed to have strength, durability and weather resistance similar to those of the conventional thermoplastic elastomer Weight reduction of 30% or more and improvement of profitability of the product can be realized, and the fuel efficiency of the automobile can be further improved.

Claims (12)

100 parts by weight of a matrix resin containing 30 to 70% by weight of ethylene propylene diene monomer and 30 to 70% by weight of polypropylene,
10 to 30 parts by weight of a microcapsule foaming agent;
5 to 30 parts by weight of a light stabilizer; And
20 to 50 parts by weight of an inorganic filler;
, ≪ / RTI &
The polypropylene is a high-crystallization block copolymer having a melt flow index of 0.1 to 0.3 g / 10 min (230 DEG C, 2.16 kg)
The microcapsule blowing agent is composed of a core-shell structure, the shell portion is made of an acrylonitrile copolymer, the core portion is made of iso-octene-unsaturated hydrocarbon, and the average particle size is 5 to 10 μm Wherein the thermoplastic elastomer composition is a thermoplastic elastomer composition for glass run.
The method according to claim 1,
Wherein the ethylene propylene diene monomer comprises 8 to 20% by weight of 5-ethylidene-2-norbornene.
delete delete delete The method according to claim 1,
Wherein the inorganic filler is calcium carbonate having an average particle size of 1 to 10 占 퐉.
The method according to claim 1,
Wherein the thermoplastic elastomer composition further contains 0.2 to 1.0 part by weight of an antioxidant, 0.2 to 1.0 part by weight of a crosslinking agent, 0.2 to 1.5 parts by weight of a crosslinking auxiliary, 0.5 to 3.0 parts by weight of a polypropylene wax, and 60 to 100 parts by weight of a process oil. Thermoplastic elastomer composition.
8. The method of claim 7,
The antioxidant is preferably a tetrakis (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, tetrakis- (3-dodecylthiopropionate) By weight based on the total weight of the thermoplastic elastomer composition.
8. The method of claim 7,
Wherein the crosslinking agent is 2,5-dimethyl-2,5-di- (tertiarybutylperoxy) -hexane.
8. The method of claim 7,
Wherein the crosslinking assistant is N, N'-m-phenylene dimaleimide, 1,2-polybutadiene or a mixture of the two.
A method for producing a thermoplastic elastomer composition for glass run,
10 to 30 parts by weight of a microcapsule blowing agent, 5 to 30 parts by weight of a light stabilizer, and 20 to 50 parts by weight of an inorganic filler are added to 100 parts by weight of a matrix resin containing 30 to 70% by weight of ethylene propylene diene monomer and 30 to 70% Mixing the components to prepare a mixture; And
Extruding the mixture at an extrusion temperature of 200 to 220 DEG C at a rate of 80 to 120 RPM;
Lt; / RTI >
The polypropylene is a high-crystallization block copolymer having a melt flow index of 0.1 to 0.3 g / 10 min (230 DEG C, 2.16 kg)
The microcapsule blowing agent is composed of a core-shell structure, the shell portion is made of an acrylonitrile copolymer, the core portion is made of iso-octene-unsaturated hydrocarbon, and the average particle size is 5 to 10 μm Wherein the thermoplastic elastomer composition for glass run is a thermoplastic elastomer composition.
12. The method of claim 11,
0.2 to 1.0 part by weight of an antioxidant, 0.2 to 1.0 part by weight of a crosslinking agent, 0.2 to 1.5 parts by weight of a crosslinking auxiliary, 0.5 to 3.0 parts by weight of a polypropylene wax and 60 to 100 parts by weight of a process oil are further mixed By weight based on the total weight of the thermoplastic elastomer composition for glass run.

Images