TPO composite material, and preparation method therefor and use thereof

Abstract

Disclosed in the present invention is a TPO composite material, comprising the following components in parts by weight: 15-30 parts of low-melt-index copolymer PP; 20-35 parts of high-melt-index copolymer PP; 15-25 parts of an SEBS elastomer; 15-35 parts of a POE elastomer; and 5-15 parts of an OBC elastomer. The present invention utilizes an OBC material having a higher melting point than POE and a molecular structure of an ethylene-based olefin elastomer, which exhibits good compatibility with copolymer PP, POE, and SEBS, and when added, achieves the effects of compatibilization and dispersion promotion, so that the TPO composite material of the present invention has excellent low-temperature toughness and high-temperature tensile properties.

Description

A TPO composite material, its preparation method and application Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a TPO composite material, its preparation method, and its application. Background Technology

[0002] TPO materials are widely used in the automotive, home appliance, and construction industries due to their excellent heat resistance, chemical resistance, and processability. However, existing TPO materials exhibit a significant decrease in impact toughness at ultra-low temperatures (such as -40°C or lower), making them unsuitable for applications in extreme cold conditions. Furthermore, increasing the material's rigidity (high modulus) typically leads to a decrease in its low-temperature toughness, further limiting its application. Therefore, there is an urgent need to develop a TPO composite material that possesses both high modulus and ultra-low temperature impact resistance to meet the application requirements in extreme environments.

[0003] In existing technologies, SEBS materials have a relatively large molecular weight and good low-temperature toughening effect, but they are generally difficult to disperse under unfilled conditions; POE materials have a low melting point, and adding a large amount at once will affect the high-temperature performance of TPO materials. Therefore, it is difficult to produce TPO materials with both low-temperature toughness and high-temperature performance using existing technologies. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical defects and provide a TPO composite material with good low-temperature toughness and good high-temperature performance.

[0005] This invention is achieved through the following technical solution:

[0006] A TPO composite material, by weight, comprises the following components:

[0007] Low melt index copolymer PP 15-30 parts;

[0008] High melt index copolymer PP 20-35 parts;

[0009] 15-25 parts of SEBS elastomer;

[0010] 15-35 parts of POE elastomer;

[0011] 5-15 parts of OBC elastomer.

[0012] In the TPO composite material of this invention, the content of low melt flow index copolymer PP can be 15 parts, 18 parts, 20 parts, 23 parts, 25 parts, 28 parts, 30 parts, etc.; the content of high melt flow index copolymer PP can be 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 35 parts, etc.; the content of SEBS elastomer can be 15 parts, 17 parts, 19 parts, 21 parts, 23 parts, 25 parts, etc.; the content of POE elastomer can be 15 parts, 17 parts, 19 parts, 21 parts, 23 parts, 25 parts, 27 parts, 29 parts, 31 parts, 33 parts, 35 parts, etc.; and the content of OBC elastomer can be 5 parts, 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, etc.

[0013] The melt index of the low melt index copolymer PP is 1-15 g / 10 min, preferably 8-15 g / 10 min. The test conditions are 230℃ and 2.16 kg, and the test is conducted according to the ISO 1133-1-2011 standard method.

[0014] The comonomer in the low melt index copolymer PP is ethylene, and the ethylene monomer content ranges from 7-15 wt%.

[0015] The high melt flow index copolymer PP has a melt flow index of 23-55 g / 10 min, preferably 23-37 g / 10 min. The test conditions are 230℃ and 2.16 kg, and the test is conducted according to the ISO 1133-1-2011 standard method.

[0016] The comonomer in the high melt index copolymer PP is ethylene, and the ethylene monomer content ranges from 7-15 wt%.

[0017] The styrene monomer content in the SEBS elastomer is 9-31 wt%, preferably 10-20 wt%.

[0018] The POE elastomer is selected from ethylene-butene copolymer or ethylene-octene copolymer; preferably, the POE elastomer is selected from ethylene-octene copolymer. The melt index of the POE elastomer ranges from 0.2 to 30 g / 10 min, and the test conditions are 190°C and 2.16 kg, tested according to the ISO 1133-1-2011 standard method.

[0019] The OBC elastomer is a polyvinyl olefin block copolymer, wherein the hard segment is a crystalline ethylene-octene copolymer and the soft segment is an amorphous ethylene-octene copolymer.

[0020] Those skilled in the art can choose whether to add 0-10 parts of filler according to actual needs, wherein the filler is selected from at least one of calcium carbonate, talc or kaolin.

[0021] Those skilled in the art can choose whether to add 0-2 parts of an additive based on actual needs. The additive is selected from at least one of antioxidants, lubricants, and light stabilizers.

[0022] The antioxidant may be one or more of antioxidant 1010, antioxidant 1076, antioxidant 1790, antioxidant 168, antioxidant DLTP, and antioxidant 626.

[0023] Optionally, the light stabilizer may be a mixture of hindered amine light stabilizers and triazine light stabilizers. The hindered amine light stabilizer may be one or more of light stabilizer 622, light stabilizer 944, light stabilizer 783, light stabilizer 3853, light stabilizer 292, or light stabilizer 123; the triazine light stabilizer may be one or more of UV-234, UV-236, or UV-237.

[0024] The preparation method of the TPO composite material of the present invention includes the following steps: mixing low melt index PP, SEBS elastomer, POE elastomer and OBC elastomer evenly, extruding and granulating by twin-screw extruder, side-feeding high melt index PP, and processing temperature range of 170-210℃ to obtain TPO composite material.

[0025] The TPO composite material of the present invention is used to prepare products that are resistant to low-temperature impact and high-temperature explosion, such as automotive airbag frames.

[0026] The present invention has the following beneficial effects:

[0027] This invention utilizes the fact that OBC material has a higher melting point than POE and its molecular structure is a vinyl olefin elastomer. It has good compatibility with copolymer PP, POE, and SEBS. Its addition has the effect of compatibilizing and promoting dispersion. At the same time, the compounding of high / low melt index copolymer PP with specific melt index can further promote the dispersion of elastomer, so that the TPO composite material of this invention has excellent low-temperature toughness and high-temperature performance.

[0028] Detailed Implementation

[0029] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0030] The raw materials used in this invention are sourced from the following sources:

[0031] Low melt flow index copolymer PP-1: melt flow index 10g / 10min (230℃ / 2.16kg), PP BX3500, manufacturer: SK Korea;

[0032] Low melt flow index copolymer PP-2: melt flow index 3g / 10min (230℃ / 2.16kg), K8003, manufacturer: Dushanzi Petrochemical;

[0033] Low melt flow index homopolymer PP: melt flow index 4g / 10min (230℃ / 2.16kg), PP7032E3, manufacturer ExxonMobil.

[0034] High melt flow rate ester copolymer PP-1: melt index 30g / 10min (230℃ / 2.16kg), PP BX3800, manufacturer: SK Korea;

[0035] High melt flow rate ester copolymer PP-2: melt index 25g / 10min (230℃ / 2.16kg), PP EP548R, manufacturer: Guangdong Zhongke.

[0036] High melt flow rate ester copolymer PP-3: melt index 35g / 10min (230℃ / 2.16kg), PP JM-370, manufacturer: Lotte Korea.

[0037] High melt flow rate ester copolymer PP-4: melt index 51g / 10min (230℃ / 2.16kg), PP EP640T, manufacturer: LyondellBasell;

[0038] High melt index homopolymer PP: Melt index 27g / 10min (230℃ / 2.16kg) PP N-Z30S, manufactured by Sinopec Maoming.

[0039] SEBS Elastomer-1: Grade MD6945, manufacturer: Kerté, styrene content 13%;

[0040] SEBS Elastomer-2: Grade G1643M, Manufacturer: Kerté, Styrene content 18%;

[0041] SEBS Elastomer-3: Grade G1642, manufactured by Kertész, styrene content 20%;

[0042] SEBS elastomer-4: Grade G1660, manufacturer: Kerté, styrene content 30%;

[0043] POE elastomer-1: Grade ENGAGE 8137, manufactured by Dow Chemical, ethylene-octene copolymer;

[0044] POE elastomer-2: Grade ENGAGE 7447, manufacturer: Dow Chemical, ethylene-butene copolymer;

[0045] OBC Elastomer-1: Brand name INFUS 9530, manufacturer: Dow Chemical.

[0046] OBC Elastomer-2: Brand name INFUS 9807, manufacturer: Dow Chemical.

[0047] Talc powder: TYT-777A, manufactured by Haicheng Tianyuan Chemical.

[0048] Antioxidant: It is obtained by compounding antioxidant 1076 and antioxidant 168 in a mass ratio of 1:2.

[0049] The lubricant is erucamide.

[0050] Preparation method of TPO composite material in examples and comparative examples: Low melt index PP, SEBS elastomer, POE elastomer and OBC elastomer are mixed evenly, extruded and granulated by twin-screw extruder, and high melt index PP is side-fed in. The processing temperature range is 170-210℃ to obtain TPO composite material.

[0051] Test methods:

[0052] (1) -45℃ cantilever beam impact test: Tested according to ISO 180-2023 standard method. The notched specimen was frozen and conditioned at -45℃ for 4 hours before the test.

[0053] (2) Tensile strength test at 85℃: The test was conducted according to the standard method of ISO 37-2017. The sample was kept at 85℃ for 4 hours before the tensile performance test was performed.

[0054] (3) Bending modulus test: Tested according to ISO 178 standard method, with a span of 64mm and a bending speed of 1mm / min.

[0055] (4) Melt index: Tested according to ISO 1133-1-2011 standard method, 230℃, 2.16kg conditions.

[0056] Table 1: TPO Composite Material Content and Test Results in Examples 1-6

[0057] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Low melt index copolymer PP-120 30 20 20 20 Low melt index copolymer PP-215 High melt index copolymer PP-130 High melt index copolymer PP-235 30 High melt index copolymer PP-320 30 High melt index copolymer PP-430 SEBS elastomer-120 25 15 20 20 20 20 POE elastomer-120 15 35 20 20 20 20 OBC elastomer-110 105 10 10 10 Talc 5-10 555 Antioxidant 0.1 0.1-0.1 0.1 0.1 Lubricant 0.1 0.1-0.1 0.1 0.1 Melt index g / 10min 9.2 3.5 6.7 7.9 10.4 13.8 -45℃ Cantilever beam impact J / m 2 78.581.271.382.871.745.785℃ Tensile Strength (MPa) 6.85.76.46.96.35.5 Flexural Modulus (MPa) 435343459415376365

[0058] As can be seen from Examples 1 / 4 / 5 / 6, if the melt index of high melt index copolymer PP is higher than 35 g / 10 min, the mechanical properties begin to decline.

[0059] Table 2: TPO Composite Material Content and Test Results in Examples 7-11

[0060] Example 7 Example 8 Example 9 Example 10 Example 11 Low melt index copolymer PP-12020202020 High melt index ester copolymer PP-13030303030 SEBS elastomer-12020 SEBS elastomer-220 SEBS elastomer-320 SEBS elastomer-420 POE elastomer-120202020 POE elastomer-220 OBC elastomer-110101010 OBC elastomer-210 Talc 55555 Antioxidant 0.1 0.1 0.1 0.1 0.1 Lubricant 0.1 0.1 0.1 0.1 0.1 Melt index g / 10min 8.6 8.3 3.5 8.6 10.2 -45℃ cantilever beam impact J / m 2 76.5 75.2 73.1 73.6 74.8 85℃ Tensile strength (MPa) 6.9 7.2 7.5 7.6 6.8 Flexural modulus (MPa) 448 466 479 485 427

[0061] As can be seen from Examples 1 / 7 / 8 / 9, the styrene monomer content in the SEBS elastomer is preferably 10-20wt% for better cantilever beam impact at -45℃.

[0062] As can be seen from Examples 1 / 10, the elastomer is preferably an ethylene-octene copolymer.

[0063] Table 3: TPO content and test results of comparative examples 1-7

[0064] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Low Melt Flow Index Copolymer PP-120 10 40 50 Low Melt Flow Index Homopolymer PP-20 20 High Melt Flow Ester Copolymer PP-130 50 40 10 High Melt Flow Ester Homopolymer PP-30 30 SEBS Elastomer-120 ... 2 17.525.612.336.356.773.468.885℃ Tensile strength (MPa) 7.87.58.16.46.56.86.9 Flexural modulus (MPa) 497472515452452462472

[0065] As can be seen from Comparative Examples 1-3, low melt flow index homopolymer PP and high melt flow index homopolymer PP cannot replace the copolymer PP of the present invention.

[0066] As can be seen from Comparative Examples 4-7, when low melt index copolymer PP, high melt index ester copolymer PP or the content of both is not within the scope of this invention, it is not possible to obtain the characteristics of excellent melt index and good mechanical properties at the same time.

[0067] Table 4: Content and Test Results of TPO Composite Materials in Comparative Examples 8-10

[0068] Comparative Example 8, Comparative Example 9, Comparative Example 10: Low melt index copolymer PP-120, 2020; High melt index ester copolymer PP-130, 3030; SEBS elastomer-125, 33.3; POE elastomer-125, 33.3; OBC elastomer-1, 16.7, 16.7; Talc 555; Antioxidant 0.1, 0.1, 0.1; Lubricant 0.1, 0.1, 0.1; Melt index (g / 10min): 8.2, 6.9, 9.5; Cantilever beam impact (J / m) at -45℃. 2 11.84 7.83 9.385℃ Tensile strength (MPa) 5.8 7.2 5.4 Flexural modulus (MPa) 455 492 421

[0069] As shown in Comparative Examples 8-10, the mechanical properties are also poor when one of the elastomers is missing but the total elastomer content remains unchanged. In particular, Comparative Example 8, which lacks the OBC elastomer, exhibits very poor mechanical properties due to insufficient compatibility between the two elastomers, especially poor toughness at -45℃.

Claims

1. A TPO composite material, characterized in that, By weight, it includes the following components: Low melt index copolymer PP 15-30 parts; High melt index copolymer PP 20-35 parts; 15-25 parts of SEBS elastomer; 15-35 parts of POE elastomer; 5-15 parts of OBC elastomer.

2. The TPO composite material according to claim 1, characterized in that, The low melt index copolymer PP has a melt index of 1-15 g / 10 min, preferably 8-15 g / 10 min, and is tested under the conditions of 230℃ and 2.16 kg, according to the ISO 1133-1-2011 standard method.

3. The TPO composite material according to claim 1, characterized in that, The high melt flow index copolymer PP has a melt flow index of 23-55 g / 10 min, preferably 23-37 g / 10 min, and is tested under the conditions of 230℃ and 2.16 kg, according to the ISO 1133-1-2011 standard method.

4. The TPO composite material according to claim 1, characterized in that, The styrene monomer content in the SEBS elastomer is 9-31 wt%, preferably 10-20 wt%.

5. The TPO composite material according to claim 1, characterized in that, The POE elastomer is selected from ethylene-butene copolymer or ethylene-octene copolymer; preferably, the POE elastomer is selected from ethylene-octene copolymer.

6. The TPO composite material according to claim 1, characterized in that, The OBC elastomer is a polyvinyl olefin block copolymer, wherein the hard segment is a crystalline ethylene-octene copolymer and the soft segment is an amorphous ethylene-octene copolymer.

7. The TPO composite material according to claim 1, characterized in that, The product also includes 0-10 parts by weight of filler, wherein the filler is selected from at least one of calcium carbonate, talc or kaolin.

8. The TPO composite material according to claim 1, characterized in that, The product also includes 0-2 parts by weight of additives, wherein the additives are selected from at least one of antioxidants, lubricants, and light stabilizers.

9. A method for preparing the TPO composite material according to any one of claims 1-8, characterized in that, The process includes the following steps: mixing low melt flow index PP, SEBS elastomer, POE elastomer, and OBC elastomer evenly, extruding and granulating the mixture through a twin-screw extruder, side-feeding high melt flow index PP, and processing at a temperature range of 170-210℃ to obtain TPO composite material.

10. The application of the TPO composite material according to any one of claims 1-8, characterized in that, Used to prepare products resistant to low-temperature impact and high-temperature explosion.