Long glass fiber reinforced polypropylene composite material and preparation method thereof

Abstract

The present invention discloses a long glass fiber reinforced polypropylene composite material and a preparation method thereof, which belongs to the technical field of composite material. The technical key points thereof are composed of polypropylene resin, long glass fiber and auxiliary agent. The raw materials are prepared according to the formula ratio. The polypropylene resin and the long glass fiber should be pretreated to remove impurities and moisture therein. The glass fiber is impregnated by impregnating the long glass fiber in the polypropylene resin by a pre-impregnation method so that a layer of resin film is covered on its surface. The pre-impregnation method can be a solution method or a melting method, which is specifically determined according to the type and properties of the polypropylene resin. Due to the introduction of the long glass fiber, the mechanical properties of the composite material such as tensile strength, bending strength and impact strength are significantly improved. Compared with the short glass fiber reinforced polypropylene composite material, the composite material of the present invention has higher strength and rigidity.

Description

Technical Field

[0001] The invention relates to the field of composite materials, in particular to a long glass fiber reinforced polypropylene composite material and a preparation method thereof. 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. However, the mechanical properties and heat resistance of polypropylene materials are relatively poor, which makes it difficult to meet the needs of some high-end fields. In order to improve the performance of polypropylene, people usually use the method of adding reinforcing materials. Among them, long glass fiber reinforced polypropylene composites (LFRT) have attracted much attention due to their excellent mechanical properties and heat resistance. The introduction of long glass fibers can significantly improve the rigidity and strength of polypropylene while maintaining good processing performance. However, the uniform dispersion and effective bonding of long glass fibers are key technical difficulties in the preparation of high-performance LFRT.

[0003] However, although some preparation methods for long glass fiber reinforced polypropylene composites have been reported, which use methods of adding reinforcing materials, such as adding glass fibers, these methods often have problems such as uneven fiber dispersion and weak bonding between fibers and resins, resulting in unstable performance of the composite materials. Summary of the invention

[0004] The object of the present invention is to provide a long glass fiber reinforced polypropylene composite material and a preparation method thereof, so as to solve the problem that although some preparation methods for long glass fiber reinforced polypropylene composite materials have been reported, the methods of adding reinforcing materials, such as adding glass fibers, are often used. However, these methods often have problems such as uneven fiber dispersion and weak bonding between fibers and resins, resulting in unstable performance of the composite materials.

[0005] Therefore, the present invention provides a long glass fiber reinforced polypropylene composite material, which consists of polypropylene resin, long glass fibers and additives.

[0006] A long glass fiber reinforced polypropylene composite material and a preparation method thereof, comprising the following steps:

[0007] Raw material preparation: Prepare polypropylene resin, long glass fiber and additives according to the formula ratio. Among them, polypropylene resin and long glass fiber should be pre-treated to remove impurities and moisture.

[0008] Glass fiber impregnation is to impregnate the long glass fiber in the polypropylene resin through the pre-impregnation method, so that the surface of the long glass fiber is covered with a layer of resin film. The pre-impregnation method can be a solution method or a melting method, which is determined by the type and properties of the polypropylene resin.

[0009] Glass fiber dispersion: The impregnated long glass fiber is mixed with polypropylene resin in a mixing device to ensure that the fiber is evenly dispersed in the resin. The mixing equipment can be a high shear mixer, a twin-screw extruder, etc. By controlling the speed, temperature, mixing time and other parameters of the mixing equipment, the dispersion of the fiber in the resin can be effectively improved.

[0010] The molding process is to mold the uniformly mixed composite material through injection molding, extrusion and other processes to obtain the desired product. During the molding process, parameters such as molding temperature and pressure should be controlled to ensure the dimensional accuracy and performance stability of the product.

[0011] Post-processing is necessary to perform post-processing on the formed products, such as cutting, grinding, spraying, etc., to meet specific application requirements.

[0012] Preferably, the rotation speed of the mixing device is set to 500 rpm and the temperature is set to 180°C.

[0013] Preferably, the polypropylene resin is used as a base material to provide a matrix of the composite material.

[0014] Preferably, the long glass fiber is used as a reinforcing material, and its length is between 10-30 mm, and is used to improve the mechanical properties and heat resistance of the composite material.

[0015] Preferably, the auxiliary agents include coupling agents, antioxidants, lubricants, etc., which are used to improve the processing performance and durability of the composite material.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In the present invention, due to the introduction of long glass fibers, mechanical properties such as tensile strength, bending strength and impact strength of the composite material are significantly improved. Compared with the short glass fiber reinforced polypropylene composite material, the composite material of the present invention has higher strength and rigidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the first dosage ratio for preparing the composite material of the present invention.

[0019] Figure 2 This is the second dosage ratio for preparing the composite material of the present invention.

[0020] Figure 3 This is the third dosage ratio for preparing the composite material of the present invention. DETAILED DESCRIPTION

[0021] 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.

[0022] Example 1

[0023] A preferred embodiment of the present invention is a long glass fiber reinforced polypropylene composite material and a preparation method thereof, comprising 70 parts of polypropylene resin, 25 parts of long glass fibers, 2 parts of coupling agents, 2 parts of antioxidants and 1 part of lubricants;

[0024] Step A: Polypropylene resin and long glass fibers should be pre-treated to remove impurities and moisture;

[0025] Step B: Mix the impregnated long glass fiber with polypropylene resin in a mixing device to ensure that the fiber is evenly dispersed in the resin. The mixing device can be a high shear mixer, a twin-screw extruder, etc. By controlling the speed of the mixing device to 500 rpm, the temperature to 180° and the mixing time to 20 minutes, the dispersion of the fiber in the resin can be effectively improved.

[0026] Step C: Molding The uniformly mixed composite material is molded by injection molding, extrusion and other processes to obtain the desired product. During the molding process, parameters such as molding temperature and pressure should be controlled to ensure the dimensional accuracy and performance stability of the product.

[0027] Step D: Post-processing The formed products are subjected to necessary post-processing, such as cutting, grinding, spraying, etc., to meet specific application requirements.

[0028] The obtained long glass fiber reinforced polypropylene composite material particles have significantly improved mechanical properties such as tensile strength, flexural strength and impact strength of the composite material due to the introduction of long glass fibers. Compared with short glass fiber reinforced polypropylene composite materials, they have higher strength and rigidity.

[0029] Example 2

[0030] A long glass fiber reinforced polypropylene composite material and a preparation method thereof, comprising 65 parts of polypropylene resin, 30 parts of long glass fibers, 3 parts of coupling agents, 1 part of antioxidants and 1 part of lubricants;

[0031] Step A: Polypropylene resin and long glass fibers should be pre-treated to remove impurities and moisture;

[0032] Step B: Mix the impregnated long glass fiber with polypropylene resin in a mixing device to ensure that the fiber is evenly dispersed in the resin. The mixing device can be a high shear mixer, a twin-screw extruder, etc. By controlling the speed of the mixing device to 500 rpm, the temperature to 180° and the mixing time to 20 minutes, the dispersion of the fiber in the resin can be effectively improved.

[0033] Step C: Molding The uniformly mixed composite material is molded by injection molding, extrusion and other processes to obtain the desired product. During the molding process, parameters such as molding temperature and pressure should be controlled to ensure the dimensional accuracy and performance stability of the product.

[0034] Step D: Post-processing The formed products are subjected to necessary post-processing, such as cutting, grinding, spraying, etc., to meet specific application requirements.

[0035] The obtained long glass fiber reinforced polypropylene composite material particles have significantly improved mechanical properties such as tensile strength, flexural strength and impact strength of the composite material due to the introduction of long glass fibers. Compared with short glass fiber reinforced polypropylene composite materials, they have higher strength and rigidity.

[0036] Example 3

[0037] A long glass fiber reinforced polypropylene composite material and a preparation method thereof, comprising 75 parts of polypropylene resin, 20 parts of long glass fibers, 2 parts of coupling agents, 2 parts of antioxidants and 1 part of lubricants;

[0038] Step A: Polypropylene resin and long glass fibers should be pre-treated to remove impurities and moisture;

[0039] Step B: Mix the impregnated long glass fiber with polypropylene resin in a mixing device to ensure that the fiber is evenly dispersed in the resin. The mixing device can be a high shear mixer, a twin-screw extruder, etc. By controlling the speed of the mixing device to 500 rpm, the temperature to 180° and the mixing time to 20 minutes, the dispersion of the fiber in the resin can be effectively improved.

[0040] Step C: Molding The uniformly mixed composite material is molded by injection molding, extrusion and other processes to obtain the desired product. During the molding process, parameters such as molding temperature and pressure should be controlled to ensure the dimensional accuracy and performance stability of the product.

[0041] Step D: Post-processing The formed products are subjected to necessary post-processing, such as cutting, grinding, spraying, etc., to meet specific application requirements.

[0042] The obtained long glass fiber reinforced polypropylene composite material particles have significantly improved mechanical properties such as tensile strength, flexural strength and impact strength of the composite material due to the introduction of long glass fibers. Compared with short glass fiber reinforced polypropylene composite materials, they have higher strength and rigidity.

[0043] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, some simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the scope of protection determined by the claims submitted for the present invention.

Claims

1. A long glass fiber reinforced polypropylene composite material, characterized in that: It is composed of polypropylene resin, long glass fiber and additives.

2. The long glass fiber reinforced polypropylene composite material and the preparation method thereof according to claim 1, characterized in that: The following steps are involved: Raw material preparation: Prepare polypropylene resin, long glass fiber and additives according to the formula ratio. Among them, polypropylene resin and long glass fiber should be pre-treated to remove impurities and moisture; Glass fiber impregnation: The long glass fiber is impregnated in the polypropylene resin by the pre-impregnation method, so that the surface is covered with a layer of resin film. The pre-impregnation method can be a solution method or a melting method, which is determined according to the type and properties of the polypropylene resin; Glass fiber dispersion: The impregnated long glass fiber is mixed with the polypropylene resin in a mixing device to ensure that the fiber is evenly dispersed in the resin. The mixing device can be a high shear mixer, a twin-screw extruder, etc. By controlling the speed, temperature, mixing time and other parameters of the mixing device, the dispersion of the fiber in the resin can be effectively improved; Molding: The uniformly mixed composite material is molded through injection molding, extrusion and other processes to obtain the desired product. During the molding process, parameters such as molding temperature and pressure should be controlled to ensure the dimensional accuracy and performance stability of the product; Post-processing is necessary to perform post-processing on the formed products, such as cutting, grinding, spraying, etc., to meet specific application requirements.

3. A long glass fiber reinforced polypropylene composite material and a preparation method thereof according to claim 2, characterized in that: The speed of the mixing device was set to 500 rpm and the temperature was 180°C.

4. The long glass fiber reinforced polypropylene composite material and the preparation method thereof according to claim 2, characterized in that: The polypropylene resin serves as a base material and provides a matrix for the composite material.

5. The long glass fiber reinforced polypropylene composite material and the preparation method thereof according to claim 2, characterized in that: The long glass fibers are used as reinforcing materials, and have a length between 10 and 30 mm, and are used to improve the mechanical properties and heat resistance of the composite material.

6. The long glass fiber reinforced polypropylene composite material and the preparation method thereof according to claim 2, characterized in that: The auxiliary agents include coupling agents, antioxidants, lubricants, etc., which are used to improve the processing performance and durability of the composite material.

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