Dustproof dynamic vulcanization thermoplastic elastomer applied to automotive trim and preparation method of dustproof dynamic vulcanization thermoplastic elastomer

Abstract

The invention provides a dustproof dynamic vulcanization thermoplastic elastomer applied to automotive interiors and a preparation method thereof, and relates to the field of high polymer materials. The elastomer is prepared from 30 to 60 parts of ethylene propylene diene monomer, 5 to 10 parts of permanent amphoteric antistatic master batch, 8 to 16 parts of low-odor high-viscosity mineral oil, 10 to 40 parts of low-odor high-viscosity polypropylene, 4 to 10 parts of vulcanizing agent, 0.2 to 0.4 part of antioxidant and 0.1 to 0.5 part of catalyst, the antistatic master batch in the formula takes ethylene propylene diene monomer as a base material, and meanwhile, an efficient and permanent amphoteric antistatic agent component is introduced, so that electrostatic dust adsorption on the surface of the elastomer is greatly reduced; and meanwhile, the low-purity catalyst is adopted to reduce the dynamic vulcanization reaction speed, so that the odor generated in the dynamic vulcanization reaction is reduced, and the prepared dynamic vulcanization thermoplastic elastomer is more suitable for being applied to automotive interiors.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a dustproof dynamically vulcanized thermoplastic elastomer used for automobile interior decoration and a preparation method thereof. Background Art

[0002] With the rapid development and iteration of the domestic automobile industry, automobile manufacturers have higher and higher requirements for automotive plastic parts. They are no longer limited to hard plastics, but pay more attention to the soft touch and comfort of automotive interior parts.

[0003] Elastomer materials have a soft touch and excellent resilience, and are increasingly valued by automobile manufacturers. They are widely used in interior decoration to improve consumers' driving experience. Elastomer materials are divided into polyurethane thermoplastic elastomers (TPU), dynamically vulcanized thermoplastic elastomers (TPV), styrene-based thermoplastic elastomers (TPS), etc.; among them, dynamically vulcanized thermoplastic elastomers are deeply loved by development engineers of automobile manufacturers because of their unique touch, matte texture, excellent heat and light resistance, and can meet the stringent requirements of automotive parts. However, since traditional dynamically vulcanized elastomers need to go through a dynamic vulcanization process, they will produce a special odor and cannot meet the increasingly stringent odor requirements of automotive interior decoration; and since elastomers are insulating plastic materials, they are prone to electrostatic adsorption and adsorb dust on the surface of parts. The long-term accumulation of dust will affect the user's perception and feel, which is also a long-term problem for automobile manufacturers. Summary of the invention

[0004] The purpose of the present invention is to provide a dust-proof dynamically vulcanized thermoplastic elastomer for automobile interior decoration and a preparation method thereof, by preparing a permanent amphoteric antistatic masterbatch based on EPDM rubber, improving the compatibility and dispersibility of the antistatic agent and the dynamically vulcanized elastomer, reducing the precipitation of the antistatic agent, improving the durability of the antistatic effect, and increasing the anti-dust time of automobile parts.

[0005] To achieve the above object, the present invention proposes the following technical solutions:

[0006] In the first aspect, a dustproof dynamically vulcanized thermoplastic elastomer for automobile interior is provided, comprising the following components in parts by weight:

[0007]

[0008] Furthermore, the Shore hardness of the dustproof dynamically vulcanized thermoplastic elastomer is 55A-95A and 35D-50D.

[0009] Furthermore, the EPDM rubber is non-oil-filled EPDM rubber or oil-filled EPDM rubber, and the Mooney viscosity ML 1+4 125 It is 45~65MU.

[0010] Furthermore, the permanent amphoteric antistatic masterbatch is an antistatic masterbatch with EPDM rubber as the base material and an antistatic agent content of 20% to 35%, and the antistatic agent is a permanent amphoteric antistatic agent and an ionic antistatic agent compounded in a mass ratio of 3:1;

[0011] The ionic antistatic agent is a quaternary ammonium salt antistatic agent;

[0012] The structure of the permanent amphoteric antistatic agent is as follows:

[0013]

[0014] In the formula, x and y are the percentages of the structural unit, x is 60% to 95%, y is 5% to 40%, and the weight average molecular weight of the permanent amphoteric antistatic agent is 1.0×10 4 ~8.0×10 4 The weight average molecular weight of the antistatic agent is 7.0×10 4 ~8.0×10 4 .

[0015] Furthermore, the low-odor high-viscosity mineral oil has a viscosity greater than 90 mm at 40°C. 2 / s of mineral oil, and the odor level of the mineral oil is less than level 3.5 according to the Volkswagen PV3900 odor standard.

[0016] Furthermore, the low-odor high-viscosity polypropylene is a polypropylene having a melt index of less than 12.0 g / 10 min under the conditions of 230° C.×5.0 kg, and the odor level of the polypropylene is less than 3.5 according to the Volkswagen PV3900 odor standard.

[0017] Furthermore, the vulcanizing agent is one of p-tert-butylphenol formaldehyde resin, p-tert-octylphenol formaldehyde resin, and 1,3-bis(tert-butylperoxyisopropyl)benzene.

[0018] Furthermore, the catalyst is one of stannous chloride containing crystal water and zinc chloride containing crystal water, and the purity of the stannous chloride containing crystal water and zinc chloride containing crystal water is 97% to 98%.

[0019] Furthermore, the antioxidant is prepared by compounding a main antioxidant and an auxiliary antioxidant in a mass ratio of 1:1 to 1:2, the main antioxidant is one of a hindered phenol antioxidant and a hindered amine antioxidant, and the auxiliary antioxidant is one of a phosphite antioxidant and a thiodipropionate antioxidant.

[0020] In a second aspect, a method for preparing a dustproof dynamically vulcanized thermoplastic elastomer for automobile interior decoration is proposed, characterized in that it comprises the following steps:

[0021] (1) Weighing each reaction component according to the preset weight proportion, including: 30-60 parts of EPDM rubber, 5-10 parts of permanent amphoteric antistatic masterbatch, 8-16 parts of low odor high viscosity mineral oil, 10-40 parts of low odor high viscosity polypropylene, 4-10 parts of vulcanizing agent, 0.2-0.4 parts of antioxidant, and 0.1-0.5 parts of catalyst;

[0022] (2) Put the EPDM rubber into a mixer and mix it for 3 to 5 minutes at a mixing temperature of 100 to 150°C;

[0023] (3) Add low-odor high-viscosity mineral oil to the kneaded EPDM rubber and continue kneading for 3 to 6 minutes;

[0024] (4) Add permanent amphoteric antistatic masterbatch and catalyst, and continue to mix for 3 to 5 minutes to obtain a mixing product;

[0025] (5) the banburying product is mixed by a single screw extruder, ground and hot-cut to obtain EPDM dynamic vulcanization masterbatch; wherein the temperature of the heating zone from the feed port to the die of the single screw extruder is set to: 140°C, 190°C, 190°C, 180°C, 180°C, 170°C, 170°C, 170°C, 150°C, 150°C, and the rotation speed is 300-500rpm;

[0026] (6) placing EPDM dynamic vulcanization masterbatch, low-odor high-viscosity polypropylene, vulcanizing agent, and antioxidant in a high-speed mixer and mixing them evenly, and then feeding them into a feeder, and feeding them into a twin-screw extruder by the feeder for dynamic vulcanization and extrusion granulation; wherein the screw of the twin-screw extruder is a high-shear screw, and the temperature of the heating zone of the twin-screw extruder from the feed port to the die is set to: 140°C, 200°C, 200°C, 190°C, 190°C, 180°C, 180°C, 160°C, 160°C, 150°C, 150°C, and the rotation speed is 300-500rpm.

[0027] It can be seen from the above technical solutions that the technical solutions of the present invention have the following beneficial effects:

[0028] The invention discloses a dustproof dynamically vulcanized thermoplastic elastomer used for automobile interior decoration and a preparation method thereof. The elastomer comprises: 30-60 parts of ethylene propylene diene monomer rubber, 5-10 parts of permanent amphoteric antistatic masterbatch, 8-16 parts of low-odor high-viscosity mineral oil, 10-40 parts of low-odor high-viscosity polypropylene, 4-10 parts of vulcanizer, 0.2-0.4 parts of antioxidant and 0.1-0.5 parts of catalyst. During the preparation, the antistatic masterbatch based on ethylene propylene diene monomer rubber is prepared to improve the compatibility and dispersibility of the antistatic agent and the dynamically vulcanized elastomer, reduce the precipitation of the antistatic agent, improve the durability of the antistatic effect, and increase the dust resistance time of automobile parts.

[0029] Specifically, 1) the dustproof dynamically vulcanized thermoplastic elastomer prepared by the present invention has excellent dustproof effect. The dust absorption of the material is reflected by detecting the change in glossiness of the material surface over a long period of time. After 1 year of monitoring under natural conditions, the glossiness changes at three lighting angles of 20°, 60°, and 85° are all less than 10%, and the dust absorption situation is significantly improved. 2) The dustproof dynamically vulcanized thermoplastic elastomer prepared by the present invention uses a low-purity catalyst to reduce the speed of the dynamic vulcanization reaction and reduce the generation of vulcanization odor, so that the obtained elastomer meets the Volkswagen PV3900 odor requirement of less than 3.5 levels; and a high-shear screw is used to ensure the dynamic vulcanization reaction, maintaining the excellent mechanical properties and good heat and light resistance of the elastomer. 3) The preparation method of the present invention has a significant effect on improving the dustproof performance of the dynamically vulcanized thermoplastic elastomer used in automotive interiors, and therefore has broad market application prospects.

[0030] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered to be part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent.

[0031] The foregoing and other aspects, embodiments and features of the present invention can be more fully understood from the following description in conjunction with the specific description. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or learned from the practice of the specific embodiments according to the present invention. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme of the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with general skills in the field to which the present invention belongs.

[0033] The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular form of "a", "an" or "the" and other similar words do not indicate a quantitative limitation, but indicate the existence of at least one. "Include" or "comprises" and other similar words mean that the elements or objects appearing before "include" or "comprises" include the features, wholes, steps, operations, elements and / or components listed after "include" or "comprises", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0034] Dynamically vulcanized thermoplastic elastomers are widely used in automobile interiors due to their excellent properties. However, traditional TPVs have a special odor that cannot meet the current requirements for the odor of automobile interiors. On the other hand, TPVs are insulating plastic materials, and their surfaces are prone to static electricity that adsorbs dust, affecting user experience. Therefore, the present invention aims to propose a dust-proof dynamically vulcanized thermoplastic elastomer for automobile interiors and a preparation method thereof. The elastomer obtained by the formula and preparation method has not only a low odor level but also significantly improved dust-proof performance.

[0035] Specifically, the method for preparing the dustproof dynamically vulcanized thermoplastic elastomer for automobile interior provided by the present invention comprises the following steps:

[0036] (1) Weighing each reaction component according to the preset weight proportion, including: 30-60 parts of EPDM rubber, 5-10 parts of permanent amphoteric antistatic masterbatch, 8-16 parts of low odor high viscosity mineral oil, 10-40 parts of low odor high viscosity polypropylene, 4-10 parts of vulcanizing agent, 0.2-0.4 parts of antioxidant, and 0.1-0.5 parts of catalyst;

[0037] (2) Put the EPDM rubber into a mixer and mix it for 3 to 5 minutes at a mixing temperature of 100 to 150°C;

[0038] Wherein, the EPDM rubber is non-oil-filled EPDM rubber or oil-filled EPDM rubber, and the Mooney viscosity ML 1+4 125 45~65MU;

[0039] (3) Add low-odor high-viscosity mineral oil to the kneaded EPDM rubber and continue kneading for 3 to 6 minutes;

[0040] Among them, low odor high viscosity mineral oil has a viscosity greater than 90mm at 40°C. 2 / s of mineral oil, and the odor level of the mineral oil is less than level 3.5 according to the Volkswagen PV3900 odor standard.

[0041] (4) Add permanent amphoteric antistatic masterbatch and catalyst, and continue to mix for 3 to 5 minutes to obtain a mixing product;

[0042] Among them, the permanent amphoteric antistatic masterbatch is an antistatic masterbatch with EPDM rubber as the base material and an antistatic agent content of 20% to 35%, and the antistatic agent is a permanent amphoteric antistatic agent and an ionic antistatic agent compounded in a mass ratio of 3:1;

[0043] The ionic antistatic agent is a quaternary ammonium salt antistatic agent, such as SH-105;

[0044] The structure of the permanent amphoteric antistatic agent is as follows:

[0045]

[0046] In the formula, x and y are the percentages of the structural unit, x is 60% to 95%, y is 5% to 40%, and the weight average molecular weight of the permanent amphoteric antistatic agent is 1.0×10 4 ~8.0×10 4 The weight average molecular weight of the antistatic agent is 7.0×10 4 ~8.0×10 4 In the embodiment, the weight average molecular weight of the selected permanent amphoteric antistatic agent is 7.0×10 4 .

[0047] The catalyst is one of stannous chloride containing crystal water and zinc chloride containing crystal water, and the purity of the stannous chloride containing crystal water and zinc chloride containing crystal water is 97% to 98%.

[0048] (5) the banburying product is mixed by a single screw extruder, ground and hot-cut to obtain EPDM dynamic vulcanization masterbatch; wherein the temperature of the heating zone from the feed port to the die of the single screw extruder is set to: 140°C, 190°C, 190°C, 180°C, 180°C, 170°C, 170°C, 170°C, 150°C, 150°C, and the rotation speed is 300-500rpm;

[0049] (6) placing EPDM dynamic vulcanization masterbatch, low-odor high-viscosity polypropylene, vulcanizing agent, and antioxidant in a high-speed mixer and mixing them evenly, and then feeding them into a feeder, and feeding them into a twin-screw extruder by the feeder for dynamic vulcanization and extrusion granulation; wherein the screw of the twin-screw extruder is a high-shear screw, and the temperature of the heating zone of the twin-screw extruder from the feed port to the die is set to: 140°C, 200°C, 200°C, 190°C, 190°C, 180°C, 180°C, 160°C, 160°C, 150°C, 150°C, and the rotation speed is 300-500rpm;

[0050] Among them, the low-odor and high-viscosity polypropylene is selected from polypropylene with a melt index of less than 12.0g / 10min under the conditions of 230℃×5.0kg, and the odor level of the polypropylene is less than level 3.5 according to the Volkswagen PV3900 odor standard; the vulcanizing agent is selected from tert-butylphenol formaldehyde resin, tert-octylphenol formaldehyde resin or 1,3-bis(tert-butylperoxyisopropyl)benzene; the antioxidant is prepared by compounding the main antioxidant and the auxiliary antioxidant in a mass ratio of 1:1 to 1:2; the main antioxidant is selected from a hindered phenol antioxidant, such as antioxidant 1076, antioxidant 1135, or a hindered amine antioxidant, such as antioxidant 5057; the auxiliary antioxidant is selected from a phosphite antioxidant, such as antioxidant 168, or a thiodipropionate antioxidant, such as antioxidant 1035 and distearyl thiodipropionate.

[0051] The dustproof dynamically vulcanized thermoplastic elastomer for automobile interior decoration and the preparation method thereof disclosed in the present invention are further specifically introduced in combination with specific embodiments.

[0052] Example 1

[0053] The preparation method of the dust-proof dynamically vulcanized thermoplastic elastomer used in automobile interior decoration is as follows:

[0054] The raw material components are weighed according to the following weight proportions, including: 57.4 parts of 48MU Mooney viscosity oil-filled EPDM rubber; 7 parts of 30% content permanent amphoteric antistatic masterbatch; 100mm low odor 2 / s mineral oil 14 parts; low odor 8g / 10min polypropylene 14 parts; tert-butylphenol formaldehyde resin 7 parts; hindered phenol primary antioxidant 0.1 parts; phosphite secondary antioxidant 0.2 parts; purity 98% containing crystal water stannous chloride 0.3 parts;

[0055] Put 48MU Mooney viscosity oil-filled EPDM rubber into a mixer and mix for 3 minutes at a temperature of 125°C; add low-odor high-viscosity mineral oil to the mixed EPDM rubber and mix for 6 minutes, then add permanent amphoteric antistatic agent masterbatch and catalyst and mix for 4 minutes; after mixing, mix by a single screw extruder, grind and hot-cut granulate to obtain EPDM dynamic vulcanization masterbatch; wherein, the temperature of the heating zone of the single screw extruder from the feed port to the die is set as follows: 140°C, 190°C, 190°C, 180°C, 180°C, 170°C, 170°C, 170°C , 170℃, 150℃, 150℃, and a speed of 300rpm; place EPDM dynamic vulcanization masterbatch, low-odor and high-viscosity polypropylene, p-tert-butylphenol formaldehyde resin, and antioxidant in a high mixer and mix them evenly, then put them into a feeder, and feed them into a twin-screw extruder through the feeder for extrusion granulation; set the temperature of the heating zone of the twin-screw extruder from the feed port to the die to: 140℃, 200℃, 200℃, 190℃, 190℃, 180℃, 180℃, 160℃, 160℃, 150℃, 150℃, and a speed of 350rpm.

[0056] Three portions of sample particles were injected into 90 mm × 90 mm × 2 mm specimens, and the specimens were placed in a 23°C environment for 24 hours before testing. The test environment was 23°C and 50% RH. In addition, the hardness, mechanical properties and glossiness were tested in accordance with national standards GB / T531-2008, GB / T528-2008 and GB / T 8807-1988, respectively. The results are shown in Table 1.

[0057] Table 1 is the performance data of the dustproof dynamically vulcanized thermoplastic elastomer obtained in Example 1

[0058]

[0059] Example 2

[0060] The preparation method of the dust-proof dynamically vulcanized thermoplastic elastomer used in automobile interior decoration is as follows:

[0061] The raw material components are weighed according to the following weight proportions, including: 49.1 parts of 55MU Mooney viscosity oil-filled EPDM rubber; 10 parts of 25% permanent amphoteric antistatic masterbatch; 108mm low odor 2 / s mineral oil 13 parts; low odor 6g / 10min polypropylene 22 parts; tert-octylphenol formaldehyde resin 5 parts; hindered amine primary antioxidant 0.2 parts; phosphite secondary antioxidant 0.2 parts; 97% zinc chloride containing crystal water 0.5 parts;

[0062] Put 55MU Mooney viscosity oil-filled EPDM rubber into a mixer and mix for 4 minutes at a temperature of 125°C; add low-odor high-viscosity mineral oil to the EPDM rubber and mix for 5 minutes, add permanent amphoteric antistatic masterbatch and catalyst and mix for 3 minutes; after mixing, mix in a single-screw extruder, grind and hot-cut granulate to obtain EPDM dynamic vulcanized masterbatch. The temperature of the heating zone of the single-screw extruder from the feed port to the die is set as: 140°C, 190°C, 190°C, 180°C, 180°C, 170°C, 170°C, 170°C, 150°C, 150°C, and the speed is 300rpm. The EPDM dynamic vulcanization masterbatch, low-odor high-viscosity polypropylene, p-tert-butylphenol formaldehyde resin and antioxidant are placed in a high-speed mixer and mixed evenly, then put into a feeder, and then fed into a twin-screw extruder by the feeder for extrusion granulation; the temperature of the twin-screw extruder from the feed port to the head heating zone is set to: 140°C, 200°C, 200°C, 190°C, 190°C, 180°C, 180°C, 160°C, 160°C, 150°C, 150°C, and the speed is 350rpm.

[0063] Three portions of sample particles were injected into 90 mm × 90 mm × 2 mm specimens, and the specimens were placed in a 23 ° C environment for 24 hours before testing. The test environment was 23 ° C, 50% RH; and the hardness, mechanical properties, and glossiness were tested in accordance with the national standards GB / T531-2008, GB / T528-2008, and GB / T 8807-1988, respectively. The results are shown in Table 2 below.

[0064] Table 2 is the performance data of the dustproof dynamically vulcanized thermoplastic elastomer obtained in Example 2

[0065]

[0066] Example 3

[0067] The preparation method of the dust-proof dynamically vulcanized thermoplastic elastomer used in automobile interior decoration is as follows:

[0068] The raw material components are weighed according to the following weight proportions, including: 25.5 parts of 62MU Mooney viscosity oil-filled EPDM rubber; 6 parts of 35% content permanent amphoteric antistatic masterbatch; 92mm low odor 2 / s mineral oil 14 parts; low odor 10g / 10min polypropylene 46 parts; tert-octylphenol formaldehyde resin 8 parts; hindered amine primary antioxidant 0.1 parts; thiodipropionate antioxidant 0.2 parts; 98% zinc chloride containing crystal water 0.2 parts;

[0069] Put 62MU Mooney viscosity oil-filled EPDM rubber into a mixer and mix for 5 minutes at a temperature of 125°C; add low-odor high-viscosity mineral oil to the EPDM rubber and mix for 6 minutes, then add permanent amphoteric antistatic masterbatch and catalyst and mix for 3 minutes; after mixing, mix in a single-screw extruder, grind and hot-cut granulate to obtain EPDM dynamic vulcanized masterbatch. The temperature of the heating zone of the single-screw extruder from the feed port to the die is set as: 140°C, 190°C, 190°C, 180°C, 180°C, 170°C, 170°C, 170°C, 150°C, 150°C, and the speed is 300rpm. Place EPDM dynamic vulcanization masterbatch, low-odor high-viscosity polypropylene, p-tert-butylphenol formaldehyde resin and antioxidant in a high-speed mixer and mix them evenly, then put them into a feeder, and feed them into a twin-screw extruder through the feeder for extrusion granulation; set the temperature of the heating zone of the twin-screw extruder from the feed port to the die to: 140°C, 200°C, 200°C, 190°C, 190°C, 180°C, 180°C, 160°C, 160°C, 150°C, 150°C, and the rotation speed is 350rpm.

[0070] Three portions of sample particles were injected into 90 mm × 90 mm × 2 mm specimens, and the specimens were placed in a 23 ° C environment for 24 hours before testing. The test environment was 23 ° C, 50% RH; and the hardness, mechanical properties, and glossiness were tested in accordance with the national standards GB / T531-2008, GB / T528-2008, and GB / T 8807-1988, respectively. The results are shown in Table 3 below.

[0071] Table 3 is the performance data of the dustproof dynamically vulcanized thermoplastic elastomer obtained in Example 3

[0072]

[0073] Comparative Example 1

[0074] The preparation method of the dust-proof dynamically vulcanized thermoplastic elastomer used in automobile interior decoration is as follows:

[0075] The raw material components are weighed according to the following weight parts, including: 59.4 parts of 48MU Mooney viscosity oil-filled EPDM rubber; 100mm low odor 2 / s mineral oil 16 parts; 8g / 10min polypropylene 16 parts; tert-butylphenol formaldehyde resin 8 parts; hindered phenol primary antioxidant 0.1 parts; phosphite secondary antioxidant 0.2 parts; 99% analytically pure stannous chloride containing crystal water 0.3 parts;

[0076] Put 48MU Mooney viscosity oil-filled EPDM rubber into a mixer and mix for 3 minutes at a temperature of 125°C; add low-odor high-viscosity mineral oil to the rubber and mix for 6 minutes, then add a catalyst and mix for 4 minutes; after mixing, mix it in a single-screw extruder, grind it and hot-cut it into granules to obtain EPDM dynamic vulcanization masterbatch. The temperature of the heating zone of the single-screw extruder from the feed port to the die is set as: 140°C, 190°C, 190°C, 180°C, 180°C, 170°C, 170°C, 170°C, 150°C, 150°C, and the speed is 300rpm. Place EPDM dynamic vulcanization masterbatch, low-odor high-viscosity polypropylene, p-tert-butylphenol formaldehyde resin and antioxidant in a high-speed mixer and mix them evenly, then put them into a feeder, and feed them into a twin-screw extruder through the feeder for extrusion granulation; set the temperature of the heating zone of the twin-screw extruder from the feed port to the die to: 140°C, 200°C, 200°C, 190°C, 190°C, 180°C, 180°C, 160°C, 160°C, 150°C, 150°C, and the rotation speed is 350rpm.

[0077] Three portions of sample particles were injected into 90 mm × 90 mm × 2 mm specimens, and the specimens were placed in a 23°C environment for 24 hours before testing. The test environment was 23°C and 50% RH. In addition, the hardness, mechanical properties and glossiness were tested in accordance with national standards GB / T531-2008, GB / T528-2008 and GB / T 8807-1988, respectively. The results are shown in Table 4 below.

[0078] Table 4 is the performance data of the dustproof dynamically vulcanized thermoplastic elastomer prepared in Comparative Example 1

[0079]

[0080] Comparative Example 2

[0081] The preparation method of the dust-proof dynamically vulcanized thermoplastic elastomer used in automobile interior decoration is as follows:

[0082] The raw material components are weighed according to the following weight proportions, including: 25.5 parts of 62MU Mooney viscosity oil-filled EPDM rubber; 6 parts of 35% content permanent amphoteric antistatic masterbatch; 92mm low odor 2 / s mineral oil 14 parts; 10g / 10min polypropylene 46 parts; tert-octylphenol formaldehyde resin 8 parts; hindered amine primary antioxidant 0.1 parts; thiodipropionate antioxidant 0.2 parts; 99% analytically pure zinc chloride containing crystal water 0.2 parts;

[0083] Put 62MU Mooney viscosity oil-filled EPDM rubber into a mixer and mix for 5 minutes at a temperature of 125°C; add low-odor high-viscosity mineral oil to the rubber and mix for 6 minutes, then add permanent amphoteric antistatic masterbatch and catalyst and mix for 3 minutes. After mixing, mix it in a single-screw extruder, grind it and hot-cut it to make EPDM dynamic vulcanized masterbatch; the temperature of the heating zone of the single-screw extruder from the feed port to the die is set as: 140°C, 190°C, 190°C, 180°C, 180°C, 170°C, 170°C, 170°C, 150°C, 150°C, and the speed is 300rpm. Place EPDM dynamic vulcanization masterbatch, low-odor high-viscosity polypropylene, tert-octylphenol formaldehyde resin and antioxidant in a high-speed mixer and mix them evenly, then put them into a feeder, and feed them into a twin-screw extruder through the feeder for extrusion granulation; set the temperature of the heating zone of the twin-screw extruder from the feed port to the die to: 140°C, 200°C, 200°C, 190°C, 190°C, 180°C, 180°C, 160°C, 160°C, 150°C, 150°C, and the rotation speed is 350rpm.

[0084] Three portions of sample particles were injected into 90 mm × 90 mm × 2 mm specimens, and the specimens were placed in a 23°C environment for 24 hours before testing. The test environment was 23°C and 50% RH. In addition, the hardness, mechanical properties and glossiness were tested in accordance with national standards GB / T531-2008, GB / T528-2008 and GB / T 8807-1988, respectively. The results are shown in Table 5 below.

[0085] Table 5 is the performance data of the dustproof dynamically vulcanized thermoplastic elastomer prepared in Comparative Example 2

[0086]

[0087] Comparative Example 3

[0088] The preparation method of the dust-proof dynamically vulcanized thermoplastic elastomer used in automobile interior decoration is as follows:

[0089] The raw material components are weighed according to the following weight parts, including: 25.5 parts of 62MU Mooney viscosity oil-filled EPDM rubber; 92mm low odor 2 / s mineral oil 14 parts; low odor 10g / 10min polypropylene 46 parts; tert-octylphenol formaldehyde resin 8 parts; hindered amine primary antioxidant 0.1 parts; thiodipropionate antioxidant 0.2 parts; 98% zinc chloride containing crystal water 0.2 parts;

[0090] Put 62MU Mooney viscosity oil-filled EPDM rubber into a mixer and mix for 5 minutes at a temperature of 125°C. Add low-odor high-viscosity mineral oil to the rubber and mix for 6 minutes, then add a catalyst and mix for 3 minutes. After mixing, mix it in a single-screw extruder, grind it and hot-cut it into granules to obtain EPDM dynamic vulcanization masterbatch; wherein, the temperature of the heating zone of the single-screw extruder from the feed port to the die is set as: 140°C, 190°C, 190°C, 180°C, 180°C, 170°C, 170°C, 170°C, 150°C, 150°C, and the speed is 300rpm. Place EPDM dynamic vulcanization masterbatch, low-odor high-viscosity polypropylene, tert-octylphenol formaldehyde resin and antioxidant in a high-speed mixer and mix them evenly, then put them into a feeder, and feed them into a twin-screw extruder through the feeder for extrusion granulation; set the temperature of the heating zone of the twin-screw extruder from the feed port to the die to: 140°C, 200°C, 200°C, 190°C, 190°C, 180°C, 180°C, 160°C, 160°C, 150°C, 150°C, and the rotation speed is 350rpm.

[0091] Three portions of sample particles were injected into 90 mm × 90 mm × 2 mm specimens, and the specimens were placed in a 23°C environment for 24 hours before testing. The test environment was 23°C and 50% RH. In addition, the hardness, mechanical properties and glossiness were tested in accordance with national standards GB / T531-2008, GB / T528-2008 and GB / T 8807-1988, respectively. The results are shown in Table 6 below.

[0092] Table 6 is the performance data of the dustproof dynamically vulcanized thermoplastic elastomer prepared in Comparative Example 3

[0093]

[0094] As can be seen from the above embodiments, the dustproof dynamically vulcanized thermoplastic elastomer prepared by the present invention for automobile interior decoration has a greatly improved dustproof effect compared with traditional elastomers, and the effective time reaches more than one year, because an antistatic masterbatch based on EPDM rubber is added to its formula, and a high-efficiency permanent amphoteric antistatic agent component is introduced at the same time; at the same time, a low-purity catalyst is used to reduce the dynamic vulcanization reaction rate, and the odor of the elastomer prepared in accordance with the formula conditions is also greatly improved compared with the traditional dynamically vulcanized elastomer, which basically meets the odor requirements of automobile manufacturers. Comprehensive analysis of Example 3 and Comparative Examples 2-3 shows that the permanent amphoteric antistatic masterbatch is conducive to reducing the odor of the dynamically vulcanized elastomer, and has a certain synergistic effect with the catalyst with a low reaction rate, thereby significantly reducing the odor level of the prepared elastomer.

[0095] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A dustproof dynamically vulcanized thermoplastic elastomer for automobile interior, characterized in that: The composition comprises the following components in parts by weight:

2. The dustproof dynamically vulcanized thermoplastic elastomer for automobile interior decoration according to claim 1, characterized in that: The Shore hardness of the dustproof dynamically vulcanized thermoplastic elastomer is 55A-95A and 35D-50D.

3. The dustproof dynamically vulcanized thermoplastic elastomer for automobile interior decoration according to claim 1, characterized in that: The EPDM rubber is non-oil-filled EPDM rubber or oil-filled EPDM rubber, with a Mooney viscosity of ML 1+4 125 It is 45~65MU.

4. The dustproof dynamically vulcanized thermoplastic elastomer for automobile interior decoration according to claim 1, characterized in that: The permanent amphoteric antistatic masterbatch is an antistatic masterbatch with EPDM rubber as the base material and an antistatic agent content of 20% to 35%, and the antistatic agent is a permanent amphoteric antistatic agent and an ionic antistatic agent compounded in a mass ratio of 3:1; The ionic antistatic agent is a quaternary ammonium salt antistatic agent; The structure of the permanent amphoteric antistatic agent is as follows: In the formula, x and y are the percentages of the structural unit, x is 60% to 95%, y is 5% to 40%, and the weight average molecular weight of the permanent amphoteric antistatic agent is 1.0×10 4 ~8.0×10 4 The weight average molecular weight of the antistatic agent is 7.0×10 4 ~8.0×10 4 .

5. The dustproof dynamically vulcanized thermoplastic elastomer for automobile interior decoration according to claim 1, characterized in that: The low-odor high-viscosity mineral oil has a viscosity greater than 90 mm at 40°C. 2 / s of mineral oil, and the odor level of the mineral oil is less than level 3.5 according to the Volkswagen PV3900 odor standard.

6. The dustproof dynamically vulcanized thermoplastic elastomer for automobile interior decoration according to claim 1, characterized in that: The low-odor high-viscosity polypropylene is a polypropylene having a melt index of less than 12.0 g / 10 min under the conditions of 230° C.×5.0 kg, and the odor level of the polypropylene is less than 3.5 according to the Volkswagen PV3900 odor standard.

7. The dustproof dynamically vulcanized thermoplastic elastomer for automobile interior decoration according to claim 1, characterized in that: The vulcanizing agent is one of p-tert-butylphenol formaldehyde resin, p-tert-octylphenol formaldehyde resin and 1,3-bis(tert-butylperoxyisopropyl)benzene.

8. The dustproof dynamically vulcanized thermoplastic elastomer for automobile interior decoration according to claim 1, characterized in that: The catalyst is one of stannous chloride containing crystal water and zinc chloride containing crystal water, and the purity of the stannous chloride containing crystal water and zinc chloride containing crystal water is 97% to 98%.

9. The dustproof dynamically vulcanized thermoplastic elastomer for automobile interior decoration according to claim 1, characterized in that: The antioxidant is prepared by compounding a main antioxidant and an auxiliary antioxidant in a mass ratio of 1:1 to 1:

2. The main antioxidant is one of a hindered phenol antioxidant and a hindered amine antioxidant, and the auxiliary antioxidant is one of a phosphite antioxidant and a thiodipropionate antioxidant.

10. A method for preparing a dust-proof dynamically vulcanized thermoplastic elastomer for automobile interior, characterized in that: The steps include: (1) Weighing each reaction component according to the preset weight proportion, including: 30-60 parts of EPDM rubber, 5-10 parts of permanent amphoteric antistatic masterbatch, 8-16 parts of low odor high viscosity mineral oil, 10-40 parts of low odor high viscosity polypropylene, 4-10 parts of vulcanizing agent, 0.2-0.4 parts of antioxidant, and 0.1-0.5 parts of catalyst; (2) Put the EPDM rubber into a mixer and mix it for 3 to 5 minutes at a mixing temperature of 100 to 150°C; (3) Add low-odor high-viscosity mineral oil to the kneaded EPDM rubber and continue kneading for 3 to 6 minutes; (4) Add permanent amphoteric antistatic masterbatch and catalyst, and continue to mix for 3 to 5 minutes to obtain a mixing product; (5) the banburying product is mixed by a single screw extruder, ground and hot-cut to obtain EPDM dynamic vulcanization masterbatch; wherein the temperature of the heating zone from the feed port to the die of the single screw extruder is set to: 140°C, 190°C, 190°C, 180°C, 180°C, 170°C, 170°C, 170°C, 150°C, 150°C, and the rotation speed is 300-500rpm; (6) placing EPDM dynamic vulcanization masterbatch, low-odor high-viscosity polypropylene, vulcanizing agent, and antioxidant in a high-speed mixer and mixing them evenly, and then feeding them into a feeder, and feeding them into a twin-screw extruder by the feeder for dynamic vulcanization and extrusion granulation; wherein the screw of the twin-screw extruder is a high-shear screw, and the temperature of the heating zone of the twin-screw extruder from the feed port to the die is set to: 140°C, 200°C, 200°C, 190°C, 190°C, 180°C, 180°C, 160°C, 160°C, 150°C, 150°C, and the rotation speed is 300-500rpm.

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