Environment-friendly thermoplastic elastomer composition and molded article produced therefrom

Abstract

A thermoplastic elastomer composition of the present invention comprises about 100 parts by weight of a thermoplastic elastomer, about 30 to about 70 parts by weight of a polyolefin resin, about 40 to about 90 parts by weight of a vegetable oil, and about 100 to about 150 parts by weight of a phosphorus nitrogen-based flame retardant. The thermoplastic elastomer composition exhibits excellent environment-friendliness, flame retardancy, moldability, slip properties, and low hardness characteristics, and enables the reduction of unpleasant odors.

Description

Eco-friendly thermoplastic elastomer composition and molded article formed therefrom

[0001] The present invention relates to an environmentally friendly thermoplastic elastomer composition and a molded article formed therefrom. More specifically, the present invention relates to a thermoplastic elastomer composition that exhibits excellent environmental friendliness, flame retardancy, moldability, slipperiness, and low hardness properties, and that can reduce unpleasant odors, and a molded article formed therefrom.

[0002]

[0003] Thermoplastic elastomers (TPEs) exhibit the elasticity of solid rubber at room temperature due to physical cross-linking, unlike chemically cross-linked solid rubbers. This allows them to be processed through extrusion and injection molding. Thermoplastic elastomers are normally composed of long molecules twisted into irregular coils. When tensile force is applied to a thermoplastic elastomer, the molecules elongate in the direction of the force. When the force is removed, the molecules quickly return to their original, disordered arrangement. Due to their easy processability and elastic resilience, demand has rapidly grown as a replacement for non-recyclable rubber, leading to the development of a variety of products. For example, thermoplastic elastomers can be used in a variety of applications, including construction gaskets, automotive components, handles, hoses, cushioning materials, and wire insulators.

[0004] When petroleum-derived mineral oils, such as paraffin oil, are applied to thermoplastic elastomer compositions, hardness, moldability, and compression set (C. Set) can be controlled. However, these mineral oils can cause environmental degradation, unpleasant odors, and poor appearance.

[0005] Therefore, there is a need to develop a thermoplastic elastomer composition that has excellent environmental friendliness, flame retardancy, formability, slip, low hardness, and other properties, and can reduce unpleasant odors.

[0006] The background technology of the present invention is disclosed in Korean Patent Publication No. 10-2016-0114994, etc.

[0007]

[0008] The purpose of the present invention is to provide a thermoplastic elastomer composition having excellent environmental friendliness, flame retardancy, formability, slipperiness, low hardness, etc., and capable of reducing unpleasant odor.

[0009] Another object of the present invention is to provide a molded article formed from the thermoplastic elastomer composition.

[0010] The above and other objects of the present invention can all be achieved by the present invention described below.

[0011]

[0012] 1. One aspect of the present invention relates to a thermoplastic elastomer composition. The thermoplastic elastomer composition comprises: about 100 parts by weight of a thermoplastic elastomer; about 30 to about 70 parts by weight of a polyolefin resin; about 40 to about 90 parts by weight of a vegetable oil; and about 100 to about 150 parts by weight of a phosphorus-nitrogen-based flame retardant.

[0013] 2. In the above 1 specific example, the thermoplastic elastomer may have a weight average molecular weight of about 100,000 to about 450,000 g / mol.

[0014] 3. In the above 1 or 2 specific examples, the polyolefin resin may include at least one of polypropylene; a random copolymer in which two or more monomers of propylene, ethylene, butylene, and octene are polymerized; a block copolymer in which ethylene-propylene rubber is blended with polypropylene; polyethylene; an ethylene-vinylacetate copolymer; and a copolymer of α-olefin.

[0015] 4. In the above specific examples 1 to 3, the polyolefin resin may have a weight average molecular weight of about 100,000 to about 550,000 g / mol.

[0016] 5. In the above specific examples 1 to 4, the polyolefin resin may have a melt flow index (MI) of about 0.5 to about 40 g / 10 min, measured under conditions of 190°C and 2.16 kg according to ASTM D1238.

[0017] 6. In the above 1 to 5 specific examples, the vegetable oil may include at least one of olive oil, canola oil, grape seed oil, and castor oil.

[0018] 7. In the above 1 to 6 specific examples, the vegetable oil may have a thermal decomposition temperature of about 325 to about 360°C, measured using a thermogravimetric analyzer (TGA) under conditions of a heating rate of 20°C / min and a temperature range of 30 to 850°C.

[0019] 8. In the above 1 to 7 specific examples, the phosphorus-based flame retardant may include at least one of piperazine pyrophosphate, melamine phosphate, melamine polyphosphate, melam pyrophosphate, melem pyrophosphate, melon pyrophosphate, melamine pyrophosphate, dimelamine pyrophosphate, melam polyphosphate, melon polyphosphate, melem polyphosphate, ammonium hydrogen phosphate, ammonium dihydrogen phosphate, and ammonium polyphosphate.

[0020] 9. In the above 1 to 8 specific examples, the thermoplastic elastomer composition may have a flame retardancy of V-0 or higher of a 1.5 mm thick specimen measured by the UL-94 vertical test method, and a total combustion time of the 1.5 mm thick specimen may be about 1 to about 29 seconds.

[0021] 10. In the above 1 to 9 specific examples, the thermoplastic elastomer composition may have a melt flow index (MI) of about 15 to about 40 g / 10 min, measured at 230°C and 5 kg according to ISO 1133.

[0022] 11. In the above 1 to 10 specific examples, the thermoplastic elastomer composition may have an adhesiveness of about 0.11 to about 0.30 as measured using a scratch hardness measuring device.

[0023] 12. In the above 1 to 11 specific examples, the thermoplastic elastomer composition may have a Shore A hardness of about 50 to about 85, measured by overlapping three 2 mm thick specimens using a Shore A durometer according to ISO 868.

[0024] 13. In the above 1 to 12 specific examples, the thermoplastic elastomer composition may have an odor generation level of 7 to 8 as measured according to the odor evaluation method of GEELY automobiles.

[0025] 14. Another aspect of the present invention relates to a molded article. The molded article is characterized in that it is formed from a thermoplastic elastomer composition according to any one of 1 to 13.

[0026]

[0027] The present invention has the effect of providing a thermoplastic elastomer composition having excellent environmental friendliness, flame retardancy, moldability, slipperiness, low hardness, etc., and capable of reducing unpleasant odor, and a molded article formed therefrom.

[0028]

[0029] Hereinafter, the present invention will be described in detail as follows.

[0030] A thermoplastic elastomer composition according to the present invention comprises (A) a thermoplastic elastomer; (B) a polyolefin resin; (C) a vegetable oil; and (D) a phosphorus-nitrogen-based flame retardant.

[0031] In this specification, “a to b” indicating a numerical range is defined as “≥a and ≤b”.

[0032]

[0033] (A) Thermoplastic elastomer

[0034] According to one specific example of the present invention, a thermoplastic elastomer can be applied together with a polyolefin resin, a specific vegetable oil, a phosphorus-based flame retardant, etc., to improve environmental friendliness, flame retardancy, moldability, slipperiness, low hardness characteristics, etc., without deteriorating the mechanical properties of the thermoplastic elastomer composition, and can reduce unpleasant odors. As such, styrenic thermoplastic elastomers, amide-based thermoplastic elastomers, urethane-based thermoplastic elastomers, ester-based thermoplastic elastomers, etc., which are used in conventional thermoplastic elastomer compositions can be used. Preferably, a styrenic thermoplastic elastomer such as a styrene-ethylene / butylene-styrene (SEBS) copolymer can be used.

[0035] In a specific example, the thermoplastic elastomer may have a weight average molecular weight measured by gel permeation chromatography (GPC) of about 100,000 to about 450,000 g / mol, for example, about 150,000 to about 400,000 g / mol. Within this range, the thermoplastic elastomer composition may have excellent mechanical properties, elastic recovery properties, etc.

[0036]

[0037] (B) Polyolefin resin

[0038] A polyolefin resin according to one specific example of the present invention can be applied together with a thermoplastic elastomer, a specific vegetable oil, a phosphorus-based flame retardant, etc., to improve environmental friendliness, flame retardancy, moldability, slipperiness, low hardness characteristics, etc., without deteriorating the mechanical properties of the thermoplastic elastomer composition, and can reduce unpleasant odors. A polyolefin resin used in a typical thermoplastic resin composition can be used.

[0039] In specific examples, the polyolefin resin may include polypropylene; a random copolymer in which two or more monomers of propylene, ethylene, butylene, and octene are polymerized; a block copolymer in which ethylene-propylene rubber is blended with polypropylene; polyethylene; an ethylene-vinylacetate copolymer; a copolymer of α-olefins; a combination thereof, and the like.

[0040] In a specific example, the polyolefin resin may have a weight average molecular weight measured by GPC of about 100,000 to about 550,000 g / mol, for example, about 150,000 to about 500,000 g / mol. Within this range, the mechanical properties, elastic recovery properties, moldability, etc. of the thermoplastic elastomer composition may be excellent.

[0041] In a specific example, the polyolefin resin may have a melt flow index (MI) of about 0.5 to about 40 g / 10 min, for example, about 0.8 to about 40 g / 10 min, measured under conditions of 190°C and 2.16 kg according to ASTM D1238. Within this range, the mechanical properties, elastic recovery properties, and moldability of the thermoplastic elastomer composition may be excellent.

[0042] In a specific example, the polyolefin resin may be included in an amount of about 30 to about 70 parts by weight, for example, about 35 to about 65 parts by weight, based on about 100 parts by weight of the thermoplastic elastomer. If the amount of the polyolefin resin is less than about 30 parts by weight based on about 100 parts by weight of the thermoplastic elastomer, there is a concern that the moldability, slipperiness, workability (miscibility between raw materials), etc. of the thermoplastic elastomer composition may be reduced, and if it exceeds about 70 parts by weight, there is a concern that the flame retardancy, slipperiness, workability (miscibility between raw materials), etc. of the thermoplastic elastomer composition may be reduced.

[0043]

[0044] (C) Vegetable oil

[0045] According to one specific example of the present invention, a vegetable oil is an environmentally friendly material, and when applied together with a thermoplastic elastomer, a polyolefin resin, a phosphorus-based flame retardant, etc., it can improve the environmental friendliness, flame retardancy, moldability, slipperiness, low hardness characteristics, etc., without deteriorating the mechanical properties of the thermoplastic elastomer composition, and can reduce unpleasant odors. As the vegetable oil, a vegetable oil derived from a plant can be used.

[0046] In a specific example, the vegetable oil may have a thermal decomposition temperature of about 325 to about 360°C, for example, about 329 to about 355°C, as measured using a thermogravimetric analyzer (TGA) under conditions of a heating rate of 20°C / min and a temperature range of 30 to 850°C. In this range, the thermoplastic elastomer composition has excellent slipperiness, workability (miscibility between raw materials), moldability, etc., and can reduce unpleasant odors.

[0047] In a specific example, the vegetable oil may include one or more of olive oil, canola oil, grapeseed oil, and castor oil.

[0048] In a specific example, the vegetable oil may have a kinematic viscosity measured at 40°C of about 90 to about 180 cSt, for example, about 100 to about 160 cSt, as determined by ASTM D445, but is not limited thereto. Within this range, the thermoplastic elastomer composition may exhibit excellent processability, flexibility, and the like.

[0049] In a specific example, the vegetable oil may be included in an amount of about 40 to about 90 parts by weight, for example, about 50 to about 80 parts by weight, based on about 100 parts by weight of the thermoplastic elastomer. If the amount of the vegetable oil is less than about 40 parts by weight based on about 100 parts by weight of the thermoplastic elastomer, there is a concern that the environmental friendliness, moldability, slipperiness, workability (miscibility between raw materials), etc. of the thermoplastic elastomer composition may be reduced, and if it exceeds about 90 parts by weight, there is a concern that the flame retardancy, workability (miscibility between raw materials), etc. of the thermoplastic elastomer composition may be reduced.

[0050] In a specific example, the weight ratio of the polyolefin resin and the vegetable oil may be from about 1:0.7 to about 1:2.5, for example from about 1:0.8 to about 1:2.1. Within this range, the flame retardancy, moldability, slipperiness, low hardness properties, etc. of the thermoplastic elastomer composition may be further improved, and an effect of reducing unpleasant odor may be obtained.

[0051]

[0052] (D) Nitrogen-based flame retardant

[0053] A phosphorus-nitrogen-based flame retardant according to one specific example of the present invention can be applied together with a thermoplastic elastomer, a polyolefin resin, a specific vegetable oil, etc., to improve environmental friendliness, flame retardancy, moldability, slipperiness, low hardness characteristics, etc., without deteriorating the mechanical properties of a thermoplastic elastomer composition, and can reduce unpleasant odors. A phosphorus-nitrogen-based flame retardant used in a typical thermoplastic elastomer composition can be used.

[0054] In specific examples, the phosphorus-nitrogen-based flame retardant may include piperazine pyrophosphate, melamine phosphate, melamine polyphosphate, melam pyrophosphate, melem pyrophosphate, melon pyrophosphate, melamine pyrophosphate, dimelamine pyrophosphate, melam polyphosphate, melon polyphosphate, melem polyphosphate, ammonium hydrogen phosphate, ammonium dihydrogen phosphate, ammonium polyphosphate, combinations thereof, multiple salts thereof, and the like. For example, the phosphorus-nitrogen-based flame retardant may include melamine polyphosphate, piperazine pyrophosphate, combinations thereof, and the like.

[0055] In a specific example, the phosphorus-nitrogen-based flame retardant may be included in an amount of about 100 to about 150 parts by weight, for example, about 100 to about 140 parts by weight, based on about 100 parts by weight of the thermoplastic elastomer. If the content of the phosphorus-nitrogen-based flame retardant is less than about 100 parts by weight based on about 100 parts by weight of the thermoplastic elastomer, there is a concern that the flame retardancy, moldability, slipperiness, etc. of the thermoplastic elastomer composition may be reduced, and if it exceeds about 150 parts by weight, there is a concern that the slipperiness, etc. of the thermoplastic elastomer composition may be reduced, and the effect of reducing unpleasant odor may not be obtained.

[0056] In a specific example, the weight ratio of the polyolefin resin and the phosphorus-nitrogen-based flame retardant may be from about 1:1.5 to about 1:4, for example from about 1:1.8 to about 1:3.5. Within this range, the flame retardancy, moldability, slip properties, etc. of the thermoplastic elastomer composition may be more excellent.

[0057] In a specific example, the weight ratio of the vegetable oil and the phosphorus-based flame retardant may be from about 1:1.2 to about 1:3, for example from about 1:1.4 to about 1:2.5. Within this range, the flame retardancy, moldability, slipperiness, low hardness properties, etc. of the thermoplastic elastomer composition may be further improved, and an effect of reducing unpleasant odor may be obtained.

[0058]

[0059] A thermoplastic elastomer composition according to one embodiment of the present invention may further include additives included in conventional thermoplastic elastomer compositions. Examples of the additives include, but are not limited to, antioxidants, anti-drip agents, heat stabilizers, fillers, UV stabilizers, lubricants, dyes, pigments, and mixtures thereof. When the additives are used, the content thereof may be about 0.001 to about 40 parts by weight, for example, about 0.1 to about 10 parts by weight, based on about 100 parts by weight of the thermoplastic elastomer.

[0060]

[0061] A thermoplastic elastomer composition according to one specific example of the present invention may be in the form of pellets obtained by mixing the above components and melt-extruding them at about 150 to about 250°C, for example, about 170 to about 230°C, using a conventional twin-screw extruder.

[0062] In a specific example, the thermoplastic elastomer composition is environmentally friendly because the content of the environmentally friendly material (vegetable oil) is about 15 wt% or more out of 100 wt% of the total thermoplastic elastomer composition.

[0063] In a specific example, the thermoplastic elastomer composition may have a flame retardancy of V-0 or higher on a 1.5 mm thick specimen measured by the UL-94 vertical test method.

[0064] In a specific example, the thermoplastic elastomer composition may have a total burning time of about 1 to about 29 seconds, for example, about 5 to about 27 seconds, of a 1.5 mm thick specimen as measured by the UL-94 vertical test method.

[0065] In a specific example, the thermoplastic elastomer composition may have a melt flow index (MI) of about 15 to about 40 g / 10 min, for example, about 17 to about 35 g / 10 min, measured under conditions of 230°C and 5 kg according to ISO 1133.

[0066] In specific examples, the thermoplastic elastomer composition may have a tackiness measured using a scratch hardness tester of from about 0.11 to about 0.30, for example from about 0.12 to about 0.25.

[0067] In a specific example, the thermoplastic elastomer composition may have a Shore A hardness of about 50 to about 85, for example, about 55 to about 80, as measured by overlapping three 2 mm thick specimens using a Shore A durometer according to ISO 868. If it is outside the above range, appropriate elasticity may not be obtained, and thus may not be suitable for the use of the present invention.

[0068] In a specific example, the thermoplastic elastomer composition may have an odor generation level of 7 to 8 as measured according to the odor evaluation method of GEELY automobiles.

[0069]

[0070] A molded article according to the present invention is formed from the thermoplastic elastomer composition. The thermoplastic elastomer composition can be manufactured in the form of pellets, and the manufactured pellets can be manufactured into various molded articles (products) through various molding methods such as injection molding, extrusion molding, vacuum molding, and casting molding. Such molding methods are well known to those skilled in the art to which the present invention pertains. The molded article has excellent environmental friendliness, flame retardancy, moldability, slipperiness, and low hardness properties, and can reduce unpleasant odors, and is useful as sealing parts, shock absorbing parts, and the like, and is particularly useful as construction gaskets, cables, and the like.

[0071]

[0072] Hereinafter, the present invention will be described in more detail through examples; however, these examples are for the purpose of explanation only and should not be construed as limiting the present invention.

[0073]

[0074] Example

[0075] Below, the specifications of each component used in the examples and comparative examples are as follows.

[0076] (A) Thermoplastic elastomer

[0077] Styrene-ethylene / butylene-styrene (SEBS) copolymer (manufacturer: Kraton Polymers, product name: G1651, weight average molecular weight: approximately 350,000 g / mol) was used.

[0078] (B) Polyolefin resin

[0079] Polypropylene (random copolymer, manufacturer: Lotte Chemical, product name: SB-520, weight average molecular weight: approximately 450,000 g / mol, melt flow index (MI, 190°C, 2.16 kg conditions): approximately 1 g / 10 min) was used.

[0080] (C) Oil

[0081] (C1) Canola oil (Manufacturer: Lotte Wellfood, Product name: Lotte Canola Oil, Thermal decomposition start temperature: approximately 355℃) was used.

[0082] (C2) Olive oil (Manufacturer: Lotte Wellfood, Product name: Lotte Olive Oil, Thermal decomposition start temperature: approximately 333℃) was used.

[0083] (C3) Paraffin oil (Manufacturer: Michang Petrochemical, Product Name: W-1900H, Thermal Decomposition Start Temperature: Approximately 230℃) was used.

[0084] (D) Nitrogen-based flame retardant

[0085] A mixture of melamine polyphosphate and piperazine pyrophosphate (Manufacturer: Shangdong Sunris, Product name: SR-202) was used.

[0086]

[0087] Examples 1 to 8 and Comparative Examples 1 to 7

[0088] Each of the above components was added in the contents as shown in Tables 2, 3, 4, and 5 below, and then extruded at about 220°C to produce pellets. The extrusion was performed using a twin-screw extruder with an L / D of 36 and a diameter of 45 mm. The manufactured pellets were dried at about 100°C for more than 4 hours, and then injection-molded in a 150-ton injection molding machine (molding temperature: about 200°C, mold temperature: about 40°C) to produce specimens. The physical properties of the manufactured specimens were evaluated by the following methods, and the results are shown in Tables 2, 3, 4, and 5 below.

[0089]

[0090] Method of measuring physical properties

[0091] (1) Flame retardancy evaluation: The flame retardancy and total burning time (sum of the burning time after the first contact (T1) and the burning time after the second contact (T2), unit: seconds) of a 1.5 mm thick injection molded specimen were measured using the UL-94 vertical test method.

[0092] (2) Melt-flow Index (MI, unit: g / 10 min): The melt-flow index was measured at 230℃ and 5 kg according to ISO 1133.

[0093] (3) Slippage evaluation: Adhesion was calculated according to Equation 1 below.

[0094] [Formula 1]

[0095] Adhesion (μ) = Coefficient of static friction (μs) - Coefficient of dynamic friction (μk)

[0096] In the above equation 1, the static friction coefficient and the dynamic friction coefficient were measured by contacting a flat plate specimen measuring 2 mm × 50 mm × 150 mm with an indenter containing an aluminum tip (R-processed tip) with a load of 0.5 kgf using a Scratch Resistance Tester (manufacturer: Heidon, model number: type 18L) at a speed of 100 mm / sec. The friction coefficient measured from the force applied to the indenter in a stationary state was defined as the static friction coefficient, and the friction coefficient measured from the force applied to the indenter when moving was defined as the dynamic friction coefficient. It was determined that the lower the adhesiveness, the better the slipperiness.

[0097] (4) Hardness evaluation: According to ISO 868, the Shore A hardness of three 2 mm thick specimens was measured using a Shore A Durometer.

[0098] (5) Degree of odor occurrence (unit: grade): For 100 g of a sample of a thermoplastic elastomer composition in the form of pellets, in accordance with the odor evaluation method of GEELY automobiles, Q / JLY J7110538C, five trained evaluators with experience in evaluating the standard more than 10 times evaluated the odor grade according to the criteria in Table 1 below, and the odor grades of each evaluator were averaged including the decimal point, and then the final grade was selected. According to Table 1 below, the lower the odor grade, the more unpleasant the odor.

[0099] Odor rating Detailed description Human senses 10 No odor Comfortable 9 Barely perceptible, difficult to identify the type of odor 8 Presence of odor detected, slightly comfortable 7 Non-irritating odor, clearly detected Certain irritating, tolerable 6 Slightly irritating odor, clearly detected 5 Moderately irritating odor, clearly detected Somewhat annoying, intolerable 4 Unpleasant odor, slightly less disgusting 3 Irritating odor, disgusting Irritating, nauseating 2 Irritating odor, very disgusting 1 Feeling short of breath, intolerable

[0100]

[0101] Example 1234 (A) (parts by weight) 100 100 100 100 (B) (parts by weight) 35 50 6550 (C1) (parts by weight) 65 65 6550 (C2) (parts by weight) ---- (C3) (parts by weight) ---- (D) (parts by weight) 120 120 120 120 Flame retardancy V-0 V-0 V-0 V-0 Total burning time 15 17 19 10 Melt flow index 20 24 28 22 Tackiness 0.16 0.14 0.12 0.12 Shore A hardness 65 7 18 0 75 Odor rating 88 88

[0102]

[0103] Example 5678 (A) (parts by weight) 100 100 100 100 (B) (parts by weight) 50 50 50 50 (C1) (parts by weight) 80 - 65 65 (C2) (parts by weight) - 65 -- (C3) (parts by weight) ---- (D) (parts by weight) 120 120 100 140 Flame retardancy V-0 V-0 V-0 V-0 Total burning time 20 17 255 Melt flow index 33 18 18 27 Tackiness 0.2 10.2 10.2 30.13 Shore A hardness 55 6 56 270 Odor rating 88 88

[0104]

[0105] Comparative Example 1234 (A) (parts by weight) 100 100 100 100 (B) (parts by weight) 257 550 50 (C1) (parts by weight) 65 653 5100 (C2) (parts by weight) ---- (C3) (parts by weight) ---- (D) (parts by weight) 120 120 120 120 Flame retardancy V-0 V-1 V-0 V-1 Total burning time 21 33 2238 Melt flow index 11 35 1234 Tackiness 0.39 0.31 0.45 0.21 Shore A hardness 50 80 70 55 Odor rating 7778

[0106]

[0107] Comparative Example 567 (A) (parts by weight) 100 100 100 (B) (parts by weight) 50 6 5 65 (C1) (parts by weight) -65 65 (C2) (parts by weight) --- (C3) (parts by weight) 65 --- (D) (parts by weight) 120 90 160 Flame retardancy V-0 V-1 V-0 Total burning time 18 40 15 Melt flow index 15 1 3 34 Tackiness 0.37 0.32 0.38 Shore A hardness 62 6 480 Odor rating 676

[0108]

[0109] From the above results, it can be seen that the thermoplastic elastomer composition of the present invention has excellent environmental friendliness, flame retardancy (flame retardancy, total combustion time), moldability (melt flow index), slipperiness (adhesion), low hardness characteristics (Shore A hardness), etc., and is capable of reducing unpleasant odor.

[0110] On the other hand, in the case of Comparative Example 1 in which the content of the polyolefin resin is less than the range of the present invention, it can be seen that the formability, slipperiness, etc. are reduced, and in the case of Comparative Example 2 in which the content of the polyolefin resin exceeds the range of the present invention, it can be seen that the flame retardancy, slipperiness, etc. are reduced. In the case of Comparative Example 3 in which the content of the vegetable oil is less than the range of the present invention, it can be seen that the eco-friendliness, formability, slipperiness, etc. are reduced, and in the case of Comparative Example 4 in which the content of the vegetable oil exceeds the range of the present invention, it can be seen that the flame retardancy, etc. are reduced, and in the case of Comparative Example 5 in which paraffin oil (C3) having a heat distortion temperature less than the range of the present invention is applied instead of the vegetable oil of the present invention, it can be seen that the slipperiness, etc. are reduced, and the effect of reducing unpleasant odor cannot be obtained. In addition, in the case of Comparative Example 6, where the content of the phosphorus-nitrogen-based flame retardant is below the range of the present invention, it can be seen that the flame retardancy, moldability, slipperiness, etc. are reduced, and in the case of Comparative Example 7, where the content of the phosphorus-nitrogen-based flame retardant exceeds the range of the present invention, it can be seen that the slipperiness, etc. are reduced and the effect of reducing unpleasant odor cannot be obtained.

[0111]

[0112] The present invention has been described with reference to exemplary embodiments. Those skilled in the art will appreciate that the present invention can be implemented in modified forms without departing from its essential characteristics. Therefore, the disclosed embodiments should be considered illustrative rather than limiting. The scope of the present invention is set forth in the claims, not the foregoing description, and all differences within the scope equivalent thereto should be construed as being encompassed by the present invention.

Claims

1. About 100 parts by weight of thermoplastic elastomer; About 30 to about 70 parts by weight of polyolefin resin; About 40 to about 90 parts by weight of vegetable oil; and A thermoplastic elastomer composition comprising about 100 to about 150 parts by weight of a nitrogen-based flame retardant.

2. A thermoplastic elastomer composition according to claim 1, characterized in that the thermoplastic elastomer has a weight average molecular weight of about 100,000 to about 450,000 g / mol.

3. A thermoplastic elastomer composition according to claim 1 or 2, wherein the polyolefin resin comprises at least one of: polypropylene; a random copolymer in which two or more monomers of propylene, ethylene, butylene, and octene are polymerized; a block copolymer in which ethylene-propylene rubber is blended into polypropylene; polyethylene; an ethylene-vinylacetate copolymer; and a copolymer of α-olefin.

4. A thermoplastic elastomer composition according to any one of claims 1 to 3, wherein the polyolefin resin has a weight average molecular weight of about 100,000 to about 550,000 g / mol.

5. A thermoplastic elastomer composition according to any one of claims 1 to 4, wherein the polyolefin resin has a melt flow index of about 0.5 to about 40 g / 10 min as measured under the conditions of 190° C. and 2.16 kg according to ASTM D1238.

6. A thermoplastic elastomer composition according to any one of claims 1 to 5, characterized in that the vegetable oil comprises at least one of olive oil, canola oil, grape seed oil, and castor oil.

7. A thermoplastic elastomer composition according to any one of claims 1 to 6, wherein the vegetable oil has a thermal decomposition temperature of about 325 to about 360°C, as measured using a thermogravimetric analyzer (TGA) under conditions of a heating rate of 20°C / min and a temperature range of 30 to 850°C.

8. A thermoplastic elastomer composition according to any one of claims 1 to 7, wherein the phosphorus-based flame retardant comprises at least one of piperazine pyrophosphate, melamine phosphate, melamine polyphosphate, melam pyrophosphate, melem pyrophosphate, melon pyrophosphate, melamine pyrophosphate, dimelamine pyrophosphate, melam polyphosphate, melon polyphosphate, melem polyphosphate, ammonium hydrogen phosphate, ammonium dihydrogen phosphate, and ammonium polyphosphate.

9. A thermoplastic elastomer composition according to any one of claims 1 to 8, characterized in that the thermoplastic elastomer composition has a flame retardancy of V-0 or higher on a 1.5 mm thick specimen as measured by the UL-94 vertical test method, and a total combustion time of the 1.5 mm thick specimen is about 1 to about 29 seconds.

10. A thermoplastic elastomer composition according to any one of claims 1 to 9, characterized in that the thermoplastic elastomer composition has a melt flow index of about 15 to about 40 g / 10 min as measured under conditions of 230° C. and 5 kg according to ISO 1133.

11. A thermoplastic elastomer composition according to any one of claims 1 to 10, characterized in that the thermoplastic elastomer composition has an adhesiveness of about 0.11 to about 0.30 as measured using a scratch hardness measuring device.

12. A thermoplastic elastomer composition according to any one of claims 1 to 11, characterized in that the thermoplastic elastomer composition has a Shore A hardness of about 50 to about 85 as measured by overlapping three 2 mm thick specimens using a Shore A durometer according to ISO 868.

13. A thermoplastic elastomer composition according to any one of claims 1 to 12, characterized in that the thermoplastic elastomer composition has an odor generation level of 7 to 8 as measured according to the odor evaluation method of GEELY automobiles.

14. A molded product characterized by being formed from a thermoplastic elastomer composition according to any one of claims 1 to 13.