CN115073874A - Polypropylene composite material for automobile spoiler and preparation method thereof - Google Patents

Abstract

The invention discloses a polypropylene composite material for an automobile spoiler, which comprises the following raw materials in percentage by weight: 39.4-54.4% of polypropylene PP, 30-35% of high-performance inorganic filler, 15-25% of POE (polyolefin elastomer), 0.25-0.35% of antioxidant A and 0.25-0.35% of antioxidant B, wherein the high-performance inorganic filler is superfine talcum powder, and the particle size ranges of the high-performance inorganic filler and the superfine talcum powder are 1-3 mu m; the POE is linear ethylene-octene copolymer with density of 0.88-0.90g/cm ³ The melt index of the polyester resin is 0.5-10g/10min under the test condition of 190 ℃ and 2.16 kg. The polypropylene composite material has better rigidity-toughness balance performance and thermal stability performance, can replace PC/ABS (plastic alloy) materials to be used for manufacturing automobile spoilers, and reduces the part cost. At the same time, the invention also disclosesA preparation method of the polypropylene composite material for the automobile spoiler.

Description

A kind of polypropylene composite material for automobile spoiler and preparation method thereof

technical field

The invention relates to the technical field of polymer modification, in particular to a polypropylene composite material used for an automobile spoiler and a preparation method thereof.

Background technique

In order to effectively reduce the impact of air resistance when the car is running at high speed, a spoiler (also called a rear wing) is designed at the rear of the car. Its function is to make the air adhere to the car to the ground to offset part of the aerodynamic lift and control the car to float. So that the car can drive close to the road, so as to improve the driving stability of the car.

The current mainstream car spoiler material is PC/ABS (plastic alloy), and the cost is very high. As a general-purpose plastic, polypropylene is widely used in automobile interior and exterior decorations, such as automobile dashboards, bumpers, pillars, due to its advantages of low cost, low density, good chemical resistance, good processability, and easy recycling. , side panels, sub-dashboards, etc., the polyolefinization of automotive decorative parts has become a trend.

However, polypropylene also has the disadvantages of low mechanical strength, poor impact performance, high shrinkage rate, and high material cost. Therefore, it needs to be modified in the actual use process to meet the performance requirements of various parts.

SUMMARY OF THE INVENTION

In view of this, the present invention proposes a polypropylene composite material for an automobile spoiler and a preparation method thereof. The prepared polypropylene composite material not only has high strength, high toughness, but also has a low coefficient of linear expansion, The current PC/ABS (plastic alloy) spoiler can be directly switched vertically, reducing material costs.

In one aspect of the present invention, the present invention proposes a polypropylene composite material for an automobile spoiler, comprising:

Polypropylene PP, high performance inorganic filler, elastomer POE, antioxidant A, antioxidant B.

According to an embodiment of the present invention, the mass percentages of the polypropylene PP, high-performance inorganic filler, elastomer POE, antioxidant A, and antioxidant B are (39.4-54.4): (30-35): (15- 25): (0.25-0.35): (0.25-0.35).

Wherein, the polypropylene PP is a block copolymerized polypropylene produced by Shanghai Petrochemical, with a trade name of PP M2600R, and its melt index is 10-30g/10min under the test conditions of 230°C and 2.16kg. The weight percentage of the polypropylene PP is 39.4-54.4%, specifically, it can be 39.4%, 44.4%, 49.4%, 54.4% and other values within this range.

The high-performance inorganic filler is ultra-fine talc powder, and the particle size range is 1-3 μm. Specifically, the numerical value of the particle size can be 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm and other numerical values within this range. The addition of ultrafine talc in this particle size range can significantly improve the rigidity, surface scratch resistance and thermal stability of the obtained material, and also has a lubricating effect, which can improve the processability of the material.

The elastomer POE is a type of linear ethylene-octene copolymer produced by Dow Company in the United States. Because of its special molecular segment structure, it has the dual characteristics of rubber and plastic. The elastomer POE density is 0.88-0.90 g/cm ³ , its melt index is 0.5-10 g/10min under the test condition of 190° C. and 2.16kg, and the weight percentage of the elastomer POE is 15-25%, specifically, it can be 15%, 20%, 25% and other values within this range. After adding and mixing, the mechanical properties and heat aging resistance of the obtained material can be improved.

The antioxidant A includes one or more of 3114 and 1010 produced by Ciba company and DSTP produced by British ICE company, and the weight percentage of the antioxidant A is 0.25-0.35%, specifically, can be 0.25%, 0.3%, 0.35% and other values within this range.

The antioxidant B includes one or both of 618 and 168 produced by Ciba company, and the weight percentage of the antioxidant B is 0.25-0.35%, specifically, can be 0.25%, 0.3%, 0.35% % and other values within this range.

In some embodiments of the present invention, by adding high-performance ultra-fine talc and elastomer POE into the polypropylene composite material formulation system, the linear expansion coefficient of the prepared polypropylene composite material is significantly reduced. Therefore, the thermal The stability and thermal shock resistance have been significantly improved. In addition, the increase of high-performance talcum powder and elastomer POE also makes the obtained polypropylene composite material have stronger rigidity and toughness, and stronger impact resistance, thereby improving the stability of automobiles during driving.

In a second aspect of the present invention, the present invention proposes a method for preparing the above-mentioned polypropylene composite material for an automobile spoiler, comprising:

(1) fully mixing each component raw material in a high-speed mixer according to the proportioning ratio to obtain a mixture;

(2) The obtained mixture is transported to a twin-screw extruder for melt extrusion, granulation and drying to obtain the polypropylene composite material.

In some embodiments of the present invention, in the step (1), the rotational speed of the high-speed mixer is 600-1800 rpm, and the stirring time is 2-4 minutes.

In some embodiments of the present invention, in the step (2), the conditions for melt extrusion in the twin-screw extruder are: 190-200°C in the first zone, 200-210°C in the second zone, and 210-230°C in the third zone , Four zones 205-220℃, pressure 15-20MPa.

In some embodiments of the present invention, in the step (2), the screw speed of the twin-screw extruder is 150-300 rpm, and the residence time of the entire extrusion process is 1-3 minutes.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Detailed ways

The present invention will be described below with reference to specific embodiments. It should be noted that these embodiments are merely illustrative and do not limit the present invention in any way.

Example 1

Weigh 54.4% of polypropylene PP, 15% of elastomer POE, 30% of high-performance inorganic filler A, 0.3% of antioxidant A, and 0.3% of antioxidant B. It should be noted that in this example, The melt flow rate of the polypropylene PP is 25g/10min (test condition: 230° C., 2.16kg), the elastomer POE is a linear ethylene-octene copolymer, and the density is 0.88-0.90g/cm ³ . Under the test conditions of 190°C and 2.16kg, the melt index is 0.5-10g/10min, the inorganic filler A is 5000 mesh talcum powder, the average particle size is 2.5μm, and the antioxidant A is DSTP and 3114, so The antioxidant B is 168. The above-mentioned raw materials are stirred in a high-speed mixer for 2-4 minutes at a speed higher than 600 r/min, mixed uniformly to obtain a premix, and the premix is placed in a twin-screw extruder for melt extrusion and granulation. After drying, the polypropylene composite material is obtained.

The melt extrusion conditions of the twin-screw extruder are: 190-200°C in the first zone, 200-210°C in the second zone, 210-230°C in the third zone, 205-220°C in the fourth zone, and pressure 15-20MPa. The rotation speed of the screw is 150-300 rpm, and the residence time of the whole extrusion process is 1-3 minutes.

Example 2

Weigh 49.4% polypropylene PP, 20% elastomer POE, 30% high-performance inorganic filler A, 0.3% antioxidant A, and 0.3% antioxidant B. It should be noted that in this example, The melt flow rate of the polypropylene PP is 25g/10min (test condition: 230° C., 2.16kg), the elastomer POE is a linear ethylene-octene copolymer, and the density is 0.88-0.90g/cm ³ . Under the test conditions of 190°C and 2.16kg, the melt index is 0.5-10g/10min, the inorganic filler A is 5000 mesh talcum powder, the average particle size is 2.5μm, and the antioxidant A is DSTP and 3114, so The antioxidant B is 168. The above-mentioned raw materials are stirred in a high-speed mixer for 2-4 minutes at a speed higher than 600 r/min, mixed uniformly to obtain a premix, and the premix is placed in a twin-screw extruder for melt extrusion and granulation. After drying, the polypropylene composite material is obtained.

The melt extrusion conditions of the twin-screw extruder are: 190-200°C in the first zone, 200-210°C in the second zone, 210-230°C in the third zone, 205-220°C in the fourth zone, and pressure 15-20MPa. The rotation speed of the screw is 150-300 rpm, and the residence time of the whole extrusion process is 1-3 minutes.

Example 3

Weigh 44.4% polypropylene PP, 25% elastomer POE, 30% high-performance inorganic filler A, 0.3% antioxidant A, and 0.3% antioxidant B. It should be noted that in this example, The melt flow rate of the polypropylene PP is 25g/10min (test condition: 230° C., 2.16kg), the elastomer POE is a linear ethylene-octene copolymer, and the density is 0.88-0.90g/cm ³ . Under the test conditions of 190°C and 2.16kg, the melt index is 0.5-10g/10min, the inorganic filler A is 5000 mesh talcum powder, the average particle size is 2.5μm, and the antioxidant A is DSTP and 3114, so The antioxidant B is 168. The above-mentioned raw materials are stirred in a high-speed mixer for 2-4 minutes at a speed higher than 600 r/min, mixed uniformly to obtain a premix, and the premix is placed in a twin-screw extruder for melt extrusion and granulation. After drying, the polypropylene composite material is obtained.

The melt extrusion conditions of the twin-screw extruder are: 190-200°C in the first zone, 200-210°C in the second zone, 210-230°C in the third zone, 205-220°C in the fourth zone, and pressure 15-20MPa. The rotation speed of the screw is 150-300 rpm, and the residence time of the whole extrusion process is 1-3 minutes.

Example 4

Weigh 49.4% polypropylene PP, 15% elastomer POE, 35% high-performance inorganic filler A, 0.3% antioxidant A, and 0.3% antioxidant B. It should be noted that in this example, The melt flow rate of the polypropylene PP is 25g/10min (test condition: 230° C., 2.16kg), the elastomer POE is a linear ethylene-octene copolymer, and the density is 0.88-0.90g/cm ³ . Under the test conditions of 190°C and 2.16kg, the melt index is 0.5-10g/10min, the inorganic filler A is 5000 mesh talcum powder, the average particle size is 2.5μm, and the antioxidant A is DSTP and 3114, so The antioxidant B is 168. The above-mentioned raw materials are stirred in a high-speed mixer for 2-4 minutes at a speed higher than 600 r/min, mixed uniformly to obtain a premix, and the premix is placed in a twin-screw extruder for melt extrusion and granulation. After drying, the polypropylene composite material is obtained.

The melt extrusion conditions of the twin-screw extruder are: 190-200°C in the first zone, 200-210°C in the second zone, 210-230°C in the third zone, 205-220°C in the fourth zone, and pressure 15-20MPa. The rotation speed of the screw is 150-300 rpm, and the residence time of the whole extrusion process is 1-3 minutes.

Example 5

Weigh 44.4% polypropylene PP, 20% elastomer POE, 35% high-performance inorganic filler A, 0.3% antioxidant A, and 0.3% antioxidant B. It should be noted that in this example, The melt flow rate of the polypropylene PP is 25g/10min (test condition: 230° C., 2.16kg), the elastomer POE is a linear ethylene-octene copolymer, and the density is 0.88-0.90g/cm ³ . Under the test conditions of 190°C and 2.16kg, the melt index is 0.5-10g/10min, the inorganic filler A is 5000 mesh talcum powder, the average particle size is 2.5μm, and the antioxidant A is DSTP and 3114, so The antioxidant B is 168. The above-mentioned raw materials are stirred in a high-speed mixer for 2-4 minutes at a speed higher than 600 r/min, mixed uniformly to obtain a premix, and the premix is placed in a twin-screw extruder for melt extrusion and granulation. After drying, the polypropylene composite material is obtained.

The melt extrusion conditions of the twin-screw extruder are: 190-200°C in the first zone, 200-210°C in the second zone, 210-230°C in the third zone, 205-220°C in the fourth zone, and pressure 15-20MPa. The rotation speed of the screw is 150-300 rpm, and the residence time of the whole extrusion process is 1-3 minutes.

Example 6

Weigh 39.4% polypropylene PP, 25% elastomer POE, 35% high-performance inorganic filler A, 0.3% antioxidant A, and 0.3% antioxidant B. It should be noted that in this example, The melt flow rate of the polypropylene PP is 25g/10min (test condition: 230° C., 2.16kg), the elastomer POE is a linear ethylene-octene copolymer, and the density is 0.88-0.90g/cm ³ . Under the test conditions of 190°C and 2.16kg, the melt index is 0.5-10g/10min, the inorganic filler A is 5000 mesh talcum powder, the average particle size is 2.5μm, and the antioxidant A is DSTP and 3114, so The antioxidant B is 168. The above-mentioned raw materials are stirred in a high-speed mixer for 2-4 minutes at a speed higher than 600 rpm, and the premix is uniformly mixed to obtain a premix. The premix is placed in a twin-screw extruder for melt extrusion and granulation. After drying, the polypropylene composite material is obtained.

The melt extrusion conditions of the twin-screw extruder are: 190-200°C in the first zone, 200-210°C in the second zone, 210-230°C in the third zone, 205-220°C in the fourth zone, and pressure 15-20MPa. The rotation speed of the screw is 150-300 rpm, and the residence time of the whole extrusion process is 1-3 minutes.

Comparative Example 1

Weigh 49.4% polypropylene PP, 20% elastomer POE, 30% high-performance inorganic filler B, 0.3% antioxidant A, and 0.3% antioxidant B. It should be noted that in this comparative example, The melt flow rate of the polypropylene PP is 25g/10min (test condition: 230° C., 2.16kg), the elastomer POE is a linear ethylene-octene copolymer, and the density is 0.88-0.90g/cm ³ . Under the test conditions of 190°C and 2.16kg, the melt index is 0.5-10g/10min, the high-performance inorganic filler B is 1250 mesh talcum powder, the average particle size is 10μm, the antioxidant A is DSTP and 3114, The antioxidant B is 168. The above-mentioned raw materials are stirred in a high-speed mixer for 2-4 minutes at a speed higher than 600 r/min, mixed uniformly to obtain a premix, and the premix is placed in a twin-screw extruder for melt extrusion and granulation. After drying, the polypropylene composite material is obtained.

The melt extrusion conditions of the twin-screw extruder are: 190-200°C in the first zone, 200-210°C in the second zone, 210-230°C in the third zone, 205-220°C in the fourth zone, and pressure 15-20MPa. The rotation speed of the screw is 150-300 rpm, and the residence time of the whole extrusion process is 1-3 minutes.

Comparative Example 2

Weigh 44.4% polypropylene PP, 20% elastomer POE, 35% high-performance inorganic filler B, 0.3% antioxidant A, and 0.3% antioxidant B. It should be noted that in this comparative example, The melt flow rate of the polypropylene PP is 25g/10min (test condition: 230° C., 2.16kg), the elastomer POE is a linear ethylene-octene copolymer, and the density is 0.88-0.90g/cm ³ . Under the test conditions of 190°C and 2.16kg, the melt index is 0.5-10g/10min, the high-performance inorganic filler B is 1250 mesh talcum powder, the average particle size is 10μm, the antioxidant A is DSTP and 3114, The antioxidant B is 168. The above-mentioned raw materials are stirred in a high-speed mixer for 2-4 minutes at a speed higher than 600 r/min, mixed uniformly to obtain a premix, and the premix is placed in a twin-screw extruder for melt extrusion and granulation. After drying, the polypropylene composite material is obtained.

The melt extrusion conditions of the twin-screw extruder are: 190-200°C in the first zone, 200-210°C in the second zone, 210-230°C in the third zone, 205-220°C in the fourth zone, and pressure 15-20MPa. The rotation speed of the screw is 150-300 rpm, and the residence time of the whole extrusion process is 1-3 minutes.

Table 1 Formulations of Examples 1-6 and Comparative Examples 1-2 (unit: %)

The polypropylene composite materials obtained in Examples 1-6 and Comparative Examples 1-2 were tested, and their notched impact strength, tensile strength, flexural modulus and coefficient of linear expansion were evaluated. The test methods and standards are as follows:

The plastic particle material produced by the above method is placed in a blast drying oven at 100° C. to dry for 2-4 hours, and then the dried pellets are injected into an injection molding machine for sample preparation. Tensile properties were carried out according to ISO 527, the size of the specimen was 170×10×4mm dumbbell-shaped splines, and the tensile speed was 50mm/min; the bending performance test was carried out according to ISO 178, and the size of the specimen was 80×10×4mm, and the bending speed was The notch is 2mm/min, the span is 64mm; the impact strength of the simply supported beam is carried out according to ISO 179, the size of the sample is 80×10×4mm, the type of notch is the A-notch in this standard, the coefficient of linear expansion is according to ISO11359, the sample is The size is 8×8×4mm.

The performance test results of Examples 1-6 and Comparative Examples 1-2 are shown in Table 2:

Table 2 Test results of Examples 1-6 and Comparative Examples 1-2

From the comparison of the test results of Examples 1-6 and Comparative Examples 1-2, it can be seen that by adding high-performance talc, namely inorganic filler A, the tensile strength and flexural modulus of the prepared polypropylene composite material are obvious. increases, while the linear expansion coefficient decreases significantly, indicating that the addition of high-performance talc can improve the rigidity and toughness of the resulting material. It can be seen from examples 1-3 and 4-6 that with the POE content of the elastomer With the increase of , the linear expansion coefficient gradually decreases, and the impact performance gradually increases, indicating that the increase of the POE of the elastomer can enhance the thermal stability performance and impact resistance performance of the obtained material; it can be seen from the comparison of Example 4-6 with Example 1-3 , with the increase of talc content, the tensile strength and flexural modulus gradually increase, but the impact performance gradually decreases, and the linear expansion coefficient decreases partially, indicating that high-performance talc powder is not added as much as possible. within a suitable range. Therefore, in the present invention, by adding an appropriate amount of high-performance ultrafine talcum powder, elastomer POE, and a reasonable combination of the proportions of each component, the prepared polypropylene composite material has high strength, high toughness and good thermal stability, which meets the requirements of Requirements for automotive spoiler materials.

The polypropylene composite material proposed by the present invention can be used in automobile spoilers, and the current PC/ABS (plastic alloy) spoilers can be directly and vertically switched without increasing the cost of mold opening. Parts in the field of alloy) material solutions can be effectively replaced to reduce manufacturing costs.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (8)

1. a polypropylene composite material for automobile spoiler, is characterized in that, comprises the raw material by following weight percentage:

The high-performance inorganic filler is ultra-fine talc, and its particle size range is 1-3 μm; the elastomer POE is a linear ethylene-octene copolymer, the density is 0.88-0.90g/cm ³ , and its temperature is 190° C. , Under the test conditions of 2.16kg, the melt index is 0.5-10g/10min. 2 . The polypropylene composite material for automobile spoiler according to claim 1 , wherein the polypropylene is a block copolymerized polypropylene, and the melt index is 10 at 230° C. under the test condition of 2.16 kg. 3 . -30g/10min. 3. The polypropylene composite material for automobile spoiler according to claim 1, wherein the antioxidant A is one or more of 3114, 1010 and DSTP. 4. The polypropylene composite material for automobile spoiler according to claim 1, wherein the antioxidant B is one or both of 618 and 168. 5. the preparation method of the polypropylene composite material for automobile spoiler as described in any one of claim 1-4, is characterized in that, comprises the following steps: Fully mix the raw materials of each component in a high-speed mixer according to the proportion to obtain a mixture; The obtained mixture is transported to a twin-screw extruder for melt extrusion, granulation and drying to obtain the polypropylene composite material. 6 . The method for preparing a polypropylene composite material for an automobile spoiler according to claim 5 , wherein the rotating speed of the high-speed mixer is 600-1800 rpm, and the stirring time is 2-4 minutes. 7 . 7. The method for preparing a polypropylene composite material for an automobile spoiler according to claim 5, wherein the conditions for melt extrusion in the twin-screw extruder are: a zone of 190-200°C, The second zone is 200-210°C, the third zone is 210-230°C, the fourth zone is 205-220°C, and the pressure is 15-20MPa. 8. The method for preparing a polypropylene composite material for an automobile spoiler as claimed in claim 5, wherein the screw speed of the twin-screw extruder is 150-300 rpm, and the entire extrusion The residence time of the process is 1-3 minutes.