Preparation method of polypropylene PP nanoscale reinforced modified particles

Abstract

The invention discloses a preparation method of polypropylene PP nano-scale reinforced modified particles, which comprises the following steps: weighing polypropylene PP, nano calcium carbonate, a coupling agent, a surfactant, a compatibilizer, a lubricant and an antioxidant according to a predetermined proportion, carrying out surface modification treatment on a nano reinforcing agent to improve the compatibility of the nano reinforcing agent with a polypropylene matrix, and carrying out extrusion molding on the nano reinforcing agent to obtain the PP nano-scale reinforced modified particles. And adding the pretreated nano reinforcing agent, polypropylene PP, a coupling agent, a surfactant, a compatibilizer, a lubricant and an antioxidant into a kneading machine. According to the invention, melt mixing is carried out under specific temperature and shearing force, the melt extruder is provided with a plurality of heating zones, so that heating is more sufficient and uniform, the nano reinforcing agent is ensured to be uniformly dispersed in a polypropylene matrix, the melt-mixed material is extruded through the melt extruder, and primary particles are cooled, so that the nano reinforcing agent is obtained. And then the polypropylene is cut into particles with specified sizes by a cutting machine, so that the reaction process is more uniform, and the toughness, strength, hardness and processability of the polypropylene can be effectively improved.

Description

Technical Field

[0001] The invention relates to the field of composite materials, in particular to a method for preparing polypropylene (PP) nano-level enhanced modified particles. Background Art

[0002] With the rapid development of science and technology and industry, the application fields of polymer materials are becoming more and more extensive. Polypropylene, as an important polymer material, is widely used due to its excellent processing performance and low cost. Polypropylene (PP) is a thermoplastic plastic with excellent comprehensive performance and is widely used. PP has good processing performance, and its yield strength, tensile strength, surface hardness are relatively excellent, and it has outstanding stress cracking resistance and wear resistance. It is widely used in automobiles, household appliances, construction and other industries.

[0003] However, the commonly used methods currently include adding various reinforcing agents and modifiers. However, the traditional modification method has the problem of uneven dispersion of the reinforcing agent, and the material particles cannot be cut into uniform sizes. As a result, the particles of different sizes have different reaction speeds, which will affect the uniformity of the reinforcing agent reaction, poor compatibility with the polypropylene matrix, and low processing performance of polypropylene, which cannot meet the application requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing nano-scale reinforced modified polypropylene (PP) particles, which is used to solve the problem that the commonly used method includes adding various reinforcing agents and modifiers, but the traditional modification method has the problem that the reinforcing agent is not evenly dispersed, the material particles cannot be cut into uniform sizes, and the particles of different sizes have different reaction speeds, which will affect the uniformity of the reinforcing agent reaction, poor compatibility with the polypropylene matrix, low processing performance of the polypropylene, and cannot meet the application requirements.

[0005] Therefore, the present invention provides a polypropylene (PP) nano-scale enhanced modified particle, characterized in that the raw materials include 75-80 parts of polypropylene (PP), 15-20 parts of nano calcium carbonate, 2-4 parts of coupling agent, 0.5-1 part of surfactant, 0.5-1 part of compatibilizer, 0.5-1 part of lubricant and 0.5-1 part of antioxidant.

[0006] A method for preparing polypropylene (PP) nano-scale enhanced modified particles comprises the following steps:

[0007] Step A: Weigh polypropylene PP, nano calcium carbonate, coupling agent, surfactant, compatibilizer, lubricant and antioxidant according to a predetermined ratio.

[0008] Step B: performing surface modification on the nano-enhancer to improve its compatibility with the polypropylene matrix.

[0009] Step C: Add the pretreated nano-reinforcement agent, polypropylene PP, coupling agent, surfactant, compatibilizer, lubricant and antioxidant into a kneader for preliminary mixing.

[0010] Step D: The premixed materials are fed into a melt mixing device and melt mixed at a specific temperature and shear force to ensure that the nano-enhancer is evenly dispersed in the polypropylene matrix.

[0011] Step E: Extruding the melt-mixed material through a melt extruder to form preliminary particles.

[0012] Step F: The preliminary particles are cooled and then cut into particles of a specified size by a cutting machine.

[0013] Step G: The cut particles are refined to remove impurities and then packaged.

[0014] Preferably, the nano-enhancer pretreatment step includes using a coupling agent to perform surface modification treatment on the nano-enhancer.

[0015] Preferably, the premixing step is carried out at a temperature of 100°C to 120°C.

[0016] Preferably, the melt mixing step is performed at a temperature of 190°C to 230°C and a shear force of 150 rpm to 300 rpm.

[0017] Preferably, the melt extruder used in the melt extrusion step has multiple heating zones, and the temperature of each heating zone is controlled at 170°C to 200°C.

[0018] Preferably, in the cooling and cutting steps, the cooling temperature is controlled at 50° C. to 70° C., and the particle size after cutting is 1 mm to 5 mm.

[0019] Preferably, in the refining and packaging steps, the refining process includes sieve filtration and hot air drying.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The invention performs surface modification treatment on a nano-enhancer to improve its compatibility with a polypropylene matrix, adds the pretreated nano-enhancer, polypropylene PP, a coupling agent, a surfactant, a compatibilizer, a lubricant and an antioxidant into a kneader for preliminary mixing, sends the premixed materials into a melt mixing device for melt mixing under a specific temperature and shear force, the melt extruder has a plurality of heating zones to make the heating more sufficient and uniform, ensures that the nano-enhancer is uniformly dispersed in the polypropylene matrix, extrude the melt mixed materials through a melt extruder to form preliminary particles, cools the preliminary particles, and then cuts them into particles of a specified size through a cutter, so that the reaction process is more uniform, and the toughness, strength, hardness and processing performance of the polypropylene can be effectively improved. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the 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.

[0023] Example 1

[0024] A method for preparing polypropylene (PP) nano-scale enhanced modified particles comprises the following steps:

[0025] Raw material preparation: 80 parts of polypropylene PP, 15 parts of nano calcium carbonate, 2 parts of coupling agent, 1 part of surfactant, 1 part of compatibilizer, 0.5 parts of lubricant, and 0.5 parts of antioxidant;

[0026] Nano-enhancer pretreatment: Surface modification of nano-calcium carbonate using coupling agent;

[0027] Premixing: Add the pretreated nano calcium carbonate, polypropylene PP, surfactant, compatibilizer, lubricant and antioxidant into a kneader and premix at 110°C for 10 minutes;

[0028] Melt mixing: The premixed materials were fed into a melt mixing device and melt mixed at 200°C and 200 rpm shear force for 20 minutes;

[0029] Melt extrusion: The melt-mixed materials are extruded through a melt extruder to form preliminary particles;

[0030] Cooling and cutting: The preliminary particles are cooled and then cut into particles of specified size by a cutting machine;

[0031] Refining and packaging: The cut particles are refined to remove impurities and then packaged.

[0032] Through the above ratio processing, melt mixing is carried out at a specific temperature and shear force. The melt extruder has multiple heating zones to make the heating more sufficient and uniform, ensuring that the nano-enhancer is evenly dispersed in the polypropylene matrix. The melt-mixed materials are extruded through the melt extruder to form preliminary particles, the preliminary particles are cooled, and then cut into particles of a specified size by a cutting machine, so that the reaction process is more uniform, which can effectively improve the toughness, strength, hardness and processing performance of polypropylene.

[0033] Example 2

[0034] A method for preparing polypropylene (PP) nano-scale enhanced modified particles comprises the following steps:

[0035] Raw material preparation: 75 parts of polypropylene PP, 20 parts of nano calcium carbonate, 2 parts of coupling agent, 1 part of surfactant, 1 part of compatibilizer, 0.5 parts of lubricant, and 0.5 parts of antioxidant;

[0036] Nano-enhancer pretreatment: Surface modification of nano-calcium carbonate using coupling agent;

[0037] Premixing: Add the pretreated nano calcium carbonate, polypropylene PP, surfactant, compatibilizer, lubricant and antioxidant into a kneader and premix at 110°C for 10 minutes;

[0038] Melt mixing: The premixed materials were fed into a melt mixing device and melt mixed at 200°C and 200 rpm shear force for 20 minutes;

[0039] Melt extrusion: The melt-mixed materials are extruded through a melt extruder to form preliminary particles;

[0040] Cooling and cutting: The preliminary particles are cooled and then cut into particles of specified size by a cutting machine;

[0041] Refining and packaging: The cut particles are refined to remove impurities and then packaged.

[0042] Through the above ratio processing, melt mixing is carried out at a specific temperature and shear force. The melt extruder has multiple heating zones to make the heating more sufficient and uniform, ensuring that the nano-reinforcement agent is evenly dispersed in the polypropylene matrix. The melt-mixed material is extruded through the melt extruder to form preliminary particles, the preliminary particles are cooled, and then cut into particles of a specified size by a cutting machine, so that the reaction process is more uniform, and the toughness, strength, hardness and processing performance of polypropylene can still be effectively improved.

[0043] Example 3

[0044] A method for preparing polypropylene (PP) nano-scale enhanced modified particles comprises the following steps:

[0045] Raw material preparation: 80 parts of polypropylene PP, 15 parts of nano calcium carbonate, 2 parts of coupling agent, 1 part of surfactant, 1 part of compatibilizer, 0.5 parts of lubricant, and 0.5 parts of antioxidant;

[0046] Nano-enhancer pretreatment: Surface modification of nano-calcium carbonate using coupling agent;

[0047] Premixing: Add the pretreated nano calcium carbonate, polypropylene PP, surfactant, compatibilizer, lubricant and antioxidant into a kneader and premix at 110°C for 10 minutes;

[0048] Melt mixing: The premixed materials were fed into a melt mixing device and melt mixed at 220°C and 200 rpm shear force for 20 minutes;

[0049] Melt extrusion: The melt-mixed materials are extruded through a melt extruder to form preliminary particles;

[0050] Cooling and cutting: The preliminary particles are cooled and then cut into particles of specified size by a cutting machine;

[0051] Refining and packaging: The cut particles are refined to remove impurities and then packaged.

[0052] Through the above ratio processing, melt mixing is carried out at a specific temperature and shear force. The melt extruder has multiple heating zones to make the heating more sufficient and uniform, ensuring that the nano-reinforcement agent is evenly dispersed in the polypropylene matrix. The melt-mixed material is extruded through the melt extruder to form preliminary particles, the preliminary particles are cooled, and then cut into particles of a specified size by a cutting machine, so that the reaction process is more uniform, and the toughness, strength, hardness and processing performance of polypropylene can still be effectively improved.

Claims

1. A polypropylene (PP) nano-scale enhanced modified particle, characterized in that: The raw materials include 75-80 parts of polypropylene PP, 15-20 parts of nano calcium carbonate, 2-4 parts of coupling agent, 0.5-1 part of surfactant, 0.5-1 part of compatibilizer, 0.5-1 part of lubricant and 0.5-1 part of antioxidant.

2. The method for preparing a polypropylene (PP) nano-scale enhanced and modified particle according to claim 1, characterized in that: The following steps are involved: Step A: Weigh polypropylene PP, nano calcium carbonate, coupling agent, surfactant, compatibilizer, lubricant and antioxidant according to a predetermined ratio. Step B: performing surface modification on the nano-enhancer to improve its compatibility with the polypropylene matrix. Step C: Add the pretreated nano-reinforcement agent, polypropylene PP, coupling agent, surfactant, compatibilizer, lubricant and antioxidant into a kneader for preliminary mixing. Step D: The premixed materials are fed into a melt mixing device and melt mixed at a specific temperature and shear force to ensure that the nano-reinforcement agent is evenly dispersed in the polypropylene matrix. Step E: Extruding the melt-mixed material through a melt extruder to form preliminary particles. Step F: The preliminary particles are cooled and then cut into particles of a specified size by a cutting machine. Step G: The cut particles are refined to remove impurities and then packaged.

3. The method for preparing a polypropylene (PP) nano-scale enhanced modified particle according to claim 2, characterized in that: The nano-enhancer pretreatment step includes using a coupling agent to perform surface modification on the nano-enhancer.

4. The method for preparing a polypropylene (PP) nano-scale enhanced modified particle according to claim 2, characterized in that: The premixing step is performed at a temperature of 100°C to 120°C.

5. The method for preparing a polypropylene (PP) nano-scale enhanced modified particle according to claim 2, characterized in that: The melt mixing step is performed at a temperature of 190° C. to 230° C. and a shear force of 150 rpm to 300 rpm.

6. The method for preparing polypropylene (PP) nano-scale enhanced modified particles according to claim 2, characterized in that: The melt extruder used in the melt extrusion step has multiple heating zones, and the temperature of each heating zone is controlled at 170° C. to 200° C.

7. The method for preparing polypropylene (PP) nano-scale enhanced modified particles according to claim 2, characterized in that: In the cooling and cutting steps, the cooling temperature is controlled at 50° C. to 70° C., and the particle size after cutting is 1 mm to 5 mm.

8. The method for preparing polypropylene (PP) nano-scale enhanced and modified particles according to claim 2, characterized in that: In the refining and packaging steps, the refining process includes sieve filtration and hot air drying.