Modified composite material and preparation method thereof

Abstract

The invention discloses a modified composite material and a preparation method thereof. The composite material is prepared from the following raw materials in parts by weight: 40-60 parts of a polypropylene material, 20-40 parts of a mineral filler, 10-15 parts of an auxiliary agent, 1-5 parts of a POE (Polyolefin Elastomer) flexibilizer, 5-15 parts of a flame retardant, 1-5 parts of a pigment, 1-5 parts of polyurethane toughened epoxy glue, 1-5 parts of thermoplastic polymer blending modified high-strength epoxy glue and 1-3 parts of nano silicon dioxide. The coating is prepared from the following components in parts by weight: 1-5 parts of polyol ester antioxidant spraying agent, 20-50 parts of high-density polyethylene, 2-10 parts of hydrotalcite, 10-20 parts of ethylene-acrylic acid copolymer, 5-15 parts of polypropylene, 5-10 parts of polyoxyethylene and 2-5 parts of organic montmorillonite. The ethylene acrylic acid copolymer is used as the compatilizer and the flexibilizer, the contradiction between the rigidity and the toughness of the composite material is solved, the toughness of the prepared high-density polyethylene / hydrotalcite nano composite material can be greatly improved, and hydrotalcite which is not organically modified can be adopted in the manner, so that the production cost is reduced; and no side reaction is generated in melt blending.

Description

Technical Field

[0001] This invention relates to the field of modified composite materials technology, and more specifically, to a modified composite material and its preparation method. Background Technology

[0002] Currently, polypropylene (PP) is one of the most commonly used plastic materials, widely applied in automobiles, home appliances, and pipes. However, the electrostatic discharge problem caused by the high insulation properties of polypropylene is becoming increasingly prominent. Its use in industries such as oil refining, chemicals, explosives, and coal production easily generates static electricity, potentially leading to explosions and fires; in the electronics industry, it can damage integrated circuits. Therefore, antistatic treatment of polypropylene is particularly important. Blending different types of polymer materials allows for the complementary properties of each component, thus broadening the material's performance and application areas. This is an important method for developing high-performance polymer materials. To further expand the application range of polypropylene, antistatic agents need to be added during blending to improve its antistatic properties. Polyolefin / hydrotalcite nanocomposites have attracted widespread attention due to their superior mechanical properties, barrier properties, thermal stability, and flame retardant properties compared to traditional composite materials. Currently, in the preparation of high-density polyethylene (HDPE) / hydrotalcite (LDH) nanocomposites, organically modified LDH, such as sodium dodecyl sulfonate or itaconic acid, is typically added. However, side reactions are inevitable during organic modification, leaving free monomers in the polymer. Furthermore, some polyfunctional compounds possess strong corrosive and irritating properties, limiting the application of composite materials. More importantly, improving the rigidity and flame retardant properties of composite materials often comes at the cost of sacrificing toughness. In addition, to protect user safety, automotive interior and exterior materials need to possess certain strength and toughness. However, existing polypropylene (PP) materials, used as automotive interior and exterior materials, are prone to deformation and breakage due to their simple molecular structure and weak intermolecular forces. Simultaneously, existing PP materials are partially crystalline resins, and under current processing conditions, their crystallization rate is relatively slow, easily forming large spherulites, resulting in poor smoothness of automotive interior and exterior materials. Furthermore, during injection molding, the shrinkage rates of PP material differ significantly between the melt flow direction (MD) and the perpendicular flow direction (TD), with the TD shrinkage rate being almost 2-3 times that of the MD shrinkage rate. This can easily lead to dimensional instability and fail to meet the requirements for existing automotive interior and exterior trim materials. Moreover, during the process of decorating a car, users or other objects are likely to come into contact with the automotive interior and exterior trim materials. Prolonged contact can easily cause scratches on the surface of the automotive interior and exterior trim materials, affecting the car's appearance. Summary of the Invention

[0003] (a) Technical problems to be solved In view of the problems existing in the prior art, the present invention provides a modified composite material and its preparation method to solve the technical problems mentioned in the background art.

[0004] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a modified composite material, comprising the following raw materials in parts by weight: 40-60 parts of polypropylene, 20-40 parts of mineral filler, 10-15 parts of additives, 1-5 parts of POE toughening agent, 5-15 parts of flame retardant, 1-5 parts of pigment, 1-5 parts of polyurethane toughened epoxy resin, 1-5 parts of thermoplastic polymer blended modified high-strength epoxy resin, 1-3 parts of nano-silica; 1-5 parts of polyol ester antioxidant spraying agent, 20-50 parts of high-density polyethylene, 2-10 parts of hydrotalcite, 10-20 parts of ethylene-acrylic acid copolymer, 5-15 parts of polypropylene, 5-10 parts of polyethylene oxide, and 2-5 parts of organomontmorillonite.

[0005] The present invention is further configured such that the POE toughening agent comprises a polydimethylsiloxane toughening agent.

[0006] The present invention is further configured such that the mineral filler includes at least one of calcium carbonate, talc, mica powder, or silica powder.

[0007] The present invention is further configured such that the additives include plasticizers, stabilizers and antioxidants.

[0008] This invention also includes a method for preparing a modified composite material, comprising the following steps: Step 1: After pretreatment, polypropylene, polyethylene oxide and organomontmorillonite are mixed in a mixer, and then the mixture is added to a twin-screw extruder for extrusion. After extrusion granulation, the finished product is obtained. Step 2: First, the ethylene-acrylic acid copolymer and hydrotalcite are thoroughly mixed in a high-speed mixer, and then extruded and granulated by a twin-screw extruder to obtain ethylene-acrylic acid / hydrotalcite masterbatch; then the ethylene-acrylic acid / hydrotalcite masterbatch is mixed evenly with high-density polyethylene, and then extruded by a twin-screw extruder to obtain high-performance high-density polyethylene / hydrotalcite nanocomposite material. Step 3: Mix the remaining raw materials except for the polyol ester antioxidant spray, and then perform hot melt treatment, opening treatment and hot pressing treatment on the mixed materials in sequence. Step 4: After heat preservation, the product is cooled, shaped, cleaned, and tested in sequence to obtain the automotive interior and exterior composite modified material.

[0009] The present invention is further configured such that the hydrotalcite and ethylene acrylic acid / hydrotalcite masterbatch are dried at 80°C for 16 hours before use.

[0010] The present invention is further configured such that the screw speed of the twin-screw extruder is 300 rpm and the extrusion temperature is controlled at 170-205℃.

[0011] The present invention is further configured such that the pretreatment involves drying organomontmorillonite at 80°C for 10 hours, drying polyethylene oxide at 40°C for 4 hours, and drying polypropylene at 80°C for 10 hours.

[0012] The present invention is further configured such that the polypropylene, polyethylene oxide and organomontmorillonite are mixed in a mixer for 15 minutes, the mixer speed is 200 rpm and the temperature is 40°C.

[0013] The present invention is further configured such that the screw speed of the twin-screw extruder is 400 rpm, the temperature zones one to five of the extrusion section are 165°C, 170°C, 175°C, 180°C and 185°C respectively, and the die head temperature is 185°C.

[0014] (III) Beneficial Effects Compared with the prior art, the present invention provides a modified composite material and its preparation method, which has the following beneficial effects: This invention uses ethylene-acrylic acid copolymer as a compatibilizer and toughening agent, resolving the contradiction between rigidity and toughness in composite materials. This significantly improves the toughness of the prepared high-density polyethylene / hydrotalcite nanocomposite material. This method allows the use of unmodified hydrotalcite, thus reducing production costs, and avoids side reactions during melt blending. The preparation method of this invention is simple and easy to operate, suitable for industrial production, further expanding the application value and scope of high-density polyethylene / hydrotalcite nanocomposite materials. Furthermore, by incorporating polypropylene materials, mineral fillers, and additives… A composite modified material prepared from POE toughening agent, flame retardant, pigment, polyurethane toughened epoxy adhesive, thermoplastic polymer blended modified high-strength epoxy adhesive, nano silica, and polyol ester antioxidant spray agent improves the hardness, tensile strength, impact strength, and wear resistance of the composite modified material. This results in products with lower shrinkage and better dimensional stability. Furthermore, by enhancing the adhesion to the polyol ester antioxidant spray agent, the wear resistance of the modified composite material is improved, preventing scratches on the surface and making the composite modified material more aesthetically pleasing. Detailed Implementation

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0016] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0018] Example 1: A modified composite material is prepared from the following raw materials in parts by weight: 40 parts polypropylene, 20 parts mineral filler, 10 parts additives, 1 part POE toughening agent, 5 parts flame retardant, 1 part pigment, 1 part polyurethane toughened epoxy adhesive, 1 part thermoplastic polymer blended modified high-strength epoxy adhesive, 1 part nano silica; 1 part polyol ester antioxidant spraying agent, 20 parts high-density polyethylene, 2 parts hydrotalcite, 10 parts ethylene-acrylic acid copolymer, 5 parts polypropylene, 5 parts polyethylene oxide, and 2 parts organomontmorillonite; wherein the POE toughening agent includes polydimethylsiloxane toughening agent; the mineral filler includes at least one of calcium carbonate, talc powder, mica powder, or silica powder; and the additives include plasticizers, stabilizers, and antioxidants.

[0019] A modified composite material is prepared from the following raw materials in parts by weight: 40-60 parts of polypropylene, 40 parts of mineral filler, 15 parts of additives, 5 parts of POE toughening agent, 15 parts of flame retardant, 5 parts of pigment, 5 parts of polyurethane toughened epoxy adhesive, 5 parts of thermoplastic polymer blended modified high-strength epoxy adhesive, 3 parts of nano-silica; 5 parts of polyol ester antioxidant spraying agent, 50 parts of high-density polyethylene, 10 parts of hydrotalcite, 20 parts of ethylene-acrylic acid copolymer, 15 parts of polypropylene, 10 parts of polyethylene oxide, and 5 parts of organomontmorillonite; wherein the POE toughening agent includes polydimethylsiloxane toughening agent; the mineral filler includes at least one of calcium carbonate, talc powder, mica powder, or silica powder; and the additives include plasticizers, stabilizers, and antioxidants.

[0020] Example 2: This invention also includes a method for preparing a modified composite material, comprising the following steps: Step 1: After pretreatment, polypropylene, polyethylene oxide and organomontmorillonite are mixed in a mixer, and then the mixture is added to a twin-screw extruder for extrusion. After extrusion granulation, the finished product is obtained. Step 2: First, the ethylene-acrylic acid copolymer and hydrotalcite are thoroughly mixed in a high-speed mixer, and then extruded and granulated by a twin-screw extruder to obtain ethylene-acrylic acid / hydrotalcite masterbatch; then the ethylene-acrylic acid / hydrotalcite masterbatch is mixed evenly with high-density polyethylene, and then extruded by a twin-screw extruder to obtain high-performance high-density polyethylene / hydrotalcite nanocomposite material. Step 3: Mix the remaining raw materials except for the polyol ester antioxidant spray, and then perform hot melt treatment, opening treatment and hot pressing treatment on the mixed materials in sequence. Step 4: After heat preservation, the product is cooled, shaped, cleaned, and tested in sequence to obtain the automotive interior and exterior composite modified material.

[0021] In a further embodiment of this application, the hydrotalcite and ethylene acrylate / hydrotalcite masterbatch are dried at 80°C for 16 hours before use.

[0022] In a further embodiment of this application, the screw speed of the twin-screw extruder is 300 rpm, and the extrusion temperature is controlled at 170°C; the pretreatment involves drying organomontmorillonite at 80°C for 10 hours, drying polyethylene oxide at 40°C for 4 hours, and drying polypropylene at 80°C for 10 hours; the mixing time of polypropylene, polyethylene oxide, and organomontmorillonite in the mixer is 15 minutes, the mixer speed is 200 rpm, and the temperature is 40°C; the screw speed of the twin-screw extruder is 400 rpm, and the temperature zones one to five of the extrusion section are 165°C, 170°C, 175°C, 180°C, and 185°C respectively, with the die head temperature at 185°C.

[0023] Example 3: This invention also includes a method for preparing a modified composite material, comprising the following steps: Step 1: After pretreatment, polypropylene, polyethylene oxide and organomontmorillonite are mixed in a mixer, and then the mixture is added to a twin-screw extruder for extrusion. After extrusion granulation, the finished product is obtained. Step 2: First, the ethylene-acrylic acid copolymer and hydrotalcite are thoroughly mixed in a high-speed mixer, and then extruded and granulated by a twin-screw extruder to obtain ethylene-acrylic acid / hydrotalcite masterbatch; then the ethylene-acrylic acid / hydrotalcite masterbatch is mixed evenly with high-density polyethylene, and then extruded by a twin-screw extruder to obtain high-performance high-density polyethylene / hydrotalcite nanocomposite material. Step 3: Mix the remaining raw materials except for the polyol ester antioxidant spray, and then perform hot melt treatment, opening treatment and hot pressing treatment on the mixed materials in sequence. Step 4: After heat preservation, the product is cooled, shaped, cleaned, and tested in sequence to obtain the automotive interior and exterior composite modified material.

[0024] In a further embodiment of the present invention, the hydrotalcite and ethylene-acrylic acid / hydrotalcite masterbatch are dried at 80°C for 16 hours before use; the screw speed of the twin-screw extruder is 300 rpm, and the extrusion temperature is controlled at 205°C; the pretreatment involves drying organomontmorillonite at 80°C for 10 hours, drying polyethylene oxide at 40°C for 4 hours, and drying polypropylene at 80°C for 10 hours; the polypropylene, polyethylene oxide, and organomontmorillonite are mixed in a mixer for 15 minutes at a speed of 200 rpm and a temperature of 40°C.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A modified composite material, characterized in that, It is prepared from the following raw materials in parts by weight: 40-60 parts polypropylene, 20-40 parts mineral filler, 10-15 parts additives, 1-5 parts POE toughening agent, 5-15 parts flame retardant, 1-5 parts pigment, 1-5 parts polyurethane toughened epoxy adhesive, 1-5 parts thermoplastic polymer blended modified high-strength epoxy adhesive, 1-3 parts nano silica; 1-5 parts polyol ester antioxidant spraying agent, 20-50 parts high-density polyethylene, 2-10 parts hydrotalcite, 10-20 parts ethylene acrylic acid copolymer, 5-15 parts polypropylene, 5-10 parts polyethylene oxide, and 2-5 parts organomontmorillonite.

2. The modified composite material according to claim 1, characterized in that: The POE toughening agent includes a polydimethylsiloxane toughening agent.

3. The modified composite material according to claim 2, characterized in that: The mineral filler includes at least one of calcium carbonate, talc, mica powder, or silica powder.

4. The modified composite material according to claim 3, characterized in that: The additives include plasticizers, stabilizers, and antioxidants.

5. The present invention also includes a method for preparing a modified composite material, characterized in that: Includes the following steps: Step 1: After pretreatment, polypropylene, polyethylene oxide and organomontmorillonite are mixed in a mixer, and then the mixture is added to a twin-screw extruder for extrusion. After extrusion granulation, the finished product is obtained. Step 2: First, the ethylene-acrylic acid copolymer and hydrotalcite are thoroughly mixed in a high-speed mixer, and then extruded and granulated by a twin-screw extruder to obtain ethylene-acrylic acid / hydrotalcite masterbatch; then the ethylene-acrylic acid / hydrotalcite masterbatch is mixed evenly with high-density polyethylene, and then extruded by a twin-screw extruder to obtain high-performance high-density polyethylene / hydrotalcite nanocomposite material. Step 3: Mix the remaining raw materials except for the polyol ester antioxidant spray, and then perform hot melt treatment, opening treatment and hot pressing treatment on the mixed materials in sequence. Step 4: After heat preservation, the product is cooled, shaped, cleaned, and tested in sequence to obtain the automotive interior and exterior composite modified material.

6. The method for preparing a modified composite material according to claim 5, characterized in that: The hydrotalcite and ethylene acrylic acid / hydrotalcite masterbatch are dried at 80°C for 16 hours before use.

7. The method for preparing a modified composite material according to claim 6, characterized in that: The twin-screw extruder has a screw speed of 300 rpm and an extrusion temperature controlled at 170-205℃.

8. The method for preparing a modified composite material according to claim 7, characterized in that: The pretreatment involves drying organomontmorillonite at 80°C for 10 hours, drying polyethylene oxide at 40°C for 4 hours, and drying polypropylene at 80°C for 10 hours.

9. The method for preparing a modified composite material according to claim 7, characterized in that: The polypropylene, polyethylene oxide, and organomontmorillonite are mixed in a mixer for 15 minutes at a speed of 200 rpm and a temperature of 40°C.

10. The method for preparing a modified composite material according to claim 7, characterized in that: The twin-screw extruder has a screw speed of 400 rpm, and the temperature zones of the extrusion section are 165℃, 170℃, 175℃, 180℃ and 185℃ respectively, with the die head temperature at 185℃.