Rice hull silicon carbon modified polypropylene composite material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of automobile materials, and discloses a rice hull silicon carbon modified polypropylene composite material and a preparation method and application thereof, and the rice hull silicon carbon modified polypropylene composite material comprises the following components by weight: 65-80 parts of polypropylene; 5-20 parts of supported rice husk charcoal; 3 to 15 parts of a compatible toughening agent; 0.2 to 1.5 parts of an antioxidant; 0.5-2 parts of a lubricant; 0.3-1 part of a light stabilizer and 0.5-1.5 parts of a coupling agent, and the supported rice husk charcoal is rice husk charcoal containing negative oxygen ions. The supported rice husk charcoal is used as a filler, so that the mechanical property of the polypropylene composite material is improved, and the light weight of the material is realized; the load type rice husk charcoal is used as a carrier of the negative oxygen ion material, so that the high load rate and the slow release effect of the negative oxygen ion material are realized, the odor of the material is reduced, and negative oxygen ions are continuously released under thermal / mechanical stress to realize an air purification function; the rice hull waste is converted into a high-added-value material, so that resources are recycled, and the functionalization cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile materials, and in particular relates to a rice husk silicon-carbon modified polypropylene composite material, a preparation method and an application thereof. Background Art

[0002] Due to its excellent physical and mechanical properties and low price, polypropylene is widely used in automotive interior and exterior components such as door sill guards, trunk side panels, and fenders. However, the polypropylene used in currently manufactured automotive parts almost always produces volatile organic compounds (VOCs) during use, posing a health risk to vehicle occupants. With increasing awareness of health and environmental protection, the issue of in-vehicle air quality is receiving increasing attention.

[0003] Natural biomaterials are environmentally friendly, renewable, lightweight, and inexpensive, making them ideal green, low-carbon materials. Using them as fillers to toughen and modify polypropylene (PP)—improving mechanical properties, environmental performance, lightweighting, odor reduction, and air purification—has become a new research topic. Summary of the Invention

[0004] The purpose of the present invention is to provide a rice husk silicon-carbon modified polypropylene composite material, a preparation method and an application, wherein the loaded rice husk carbon is used as a filler to improve the mechanical properties of the polypropylene composite material and realize the lightweight of the material; the loaded rice husk carbon is used as a carrier of the negative oxygen ion material to achieve a high loading rate and sustained release effect of the negative oxygen ion material, reduce the odor of the material, and continuously release negative oxygen ions under thermal / mechanical stress to realize the air purification function; rice husk waste is converted into high-value-added materials, so that resources are recycled and the functionalization cost is reduced.

[0005] The specific plan is as follows:

[0006] A rice husk silicon-carbon modified polypropylene composite material comprises the following components, measured by weight: 65-80 parts of polypropylene; 5-20 parts of supported rice husk carbon; 3-15 parts of a compatible toughening agent; 0.2-1.5 parts of an antioxidant; 0.5-2 parts of a lubricant; 0.3-1 parts of a light stabilizer; and 0.5-1.5 parts of a coupling agent. The supported rice husk carbon contains negative oxygen ions.

[0007] Furthermore, the loaded rice husk charcoal is prepared by washing, drying and crushing the rice husk, carbonizing the crushed rice husk at high temperature in an inert gas to generate porous silicon carbon, and dissolving the impurities with a dilute acid; the purified silicon carbon is then immersed in a solution containing a negative oxygen ion material, and subjected to ultrasonic treatment and drying.

[0008] Furthermore, the negative oxygen ion material is tourmaline nanopowder or negative ion powder.

[0009] Furthermore, the rice husk is crushed to 100-200 mesh, and the crushed rice husk is carbonized in nitrogen at 600-800° C. for 2-4 hours to prepare porous silicon carbon, and then impurities are removed using dilute hydrochloric acid or dilute sulfuric acid.

[0010] Furthermore, the mass of the negative oxygen ion material in the loaded rice husk charcoal accounts for 5-20% of the mass of the rice husk silicon charcoal.

[0011] Furthermore, the polypropylene is homopolymer polypropylene or copolymer polypropylene, or a mixture of both.

[0012] Furthermore, the polypropylene melt index is 25 g / 10 min to 55 g / 10 min.

[0013] Furthermore, the compatible toughening agent is one of maleic anhydride grafted and epoxy grafted polyolefin copolymers;

[0014] The antioxidant is one or a mixture of antioxidant 1010, antioxidant 168, antioxidant DSTP, antioxidant 3114, and antioxidant 619F;

[0015] The lubricant is one or a mixture of paraffin wax, polyethylene wax, stearic acid, stearic acid metal salt, ethylene bis stearic acid amide, and ethylene acrylic acid copolymer metal salt;

[0016] The light stabilizer is a hindered amine light stabilizer;

[0017] The coupling agent is a silane coupling agent.

[0018] A method for preparing a rice husk silicon-carbon modified polypropylene composite material, used for the rice husk silicon-carbon modified polypropylene composite material, comprising the following steps:

[0019] S1. After washing, drying, and crushing the rice husk, the crushed rice husk is carbonized at high temperature in an inert gas to produce porous silicon carbon, which is then dissolved with dilute acid to remove impurities; the purified silicon carbon is then immersed in a solution containing a negative oxygen ion material, and the supported rice husk carbon is obtained after ultrasonic treatment and drying;

[0020] S2. According to the raw material formula of the rice husk silicon-carbon modified polypropylene composite material, polypropylene, supported rice husk carbon, compatible toughening agent, antioxidant, lubricant, light stabilizer, and coupling agent are weighed in sequence;

[0021] S3, placing polypropylene, supported rice husk char, compatible toughening agent, antioxidant, lubricant, light stabilizer, and coupling agent in a mixer at a mixing temperature of 50-80° C. and performing high-speed premixing to obtain a premix;

[0022] S4, nitrogen is continuously introduced into the twin-screw extruder, and the premix prepared in step S3 is added to the main hopper of the twin-screw extruder, the extruder processing temperature is controlled at 180-200 ° C, the screw speed is controlled at 350-500 r / min, and the pellets are cut after melt extrusion by the twin-screw extruder. When the twin-screw extruder starts to discharge, the vacuum degree in the barrel of the twin-screw extruder is controlled at -0.02-0.05 MPa;

[0023] S5. Place the mixture particles obtained in step S4 in a homogenous mixing and drying device, and homogenize and dry them for more than 1 hour at a temperature of 70-90° C. and a vacuum degree of -0.02-0.05 MPa to obtain the rice husk silicon-carbon modified polypropylene composite material.

[0024] Automobile interior and exterior trim parts are prepared by adopting the rice husk silicon-carbon modified polypropylene composite material.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The rice husk silicon carbon used as an organic filler in the present invention not only improves the mechanical properties but also achieves lightweighting of the material;

[0027] 2. The rice husk silicon carbon of the present invention is used as a carrier of negative oxygen ion materials. Its porous structure achieves a high loading rate and a slow-release effect, reducing the material's odor and releasing negative oxygen ions, thus purifying the vehicle interior environment.

[0028] 3. The rice husk silicon carbon of the present invention is prepared from rice husk waste, which converts the waste into high value-added materials, enables the recycling of resources, and reduces the functionalization cost. DETAILED DESCRIPTION

[0029] The following is a detailed description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] The present invention provides a rice husk silicon carbon modified polypropylene composite material, which comprises the following components by weight: 65-80 parts of polypropylene; 5-20 parts of supported rice husk carbon; 3-15 parts of compatible toughening agent; 0.2-1.5 parts of antioxidant; 0.5-2 parts of lubricant; 0.3-1 parts of light stabilizer and 0.5-1.5 parts of coupling agent, wherein the supported rice husk carbon is rice husk carbon containing negative oxygen ions.

[0031] Loaded rice husk charcoal is prepared by washing, drying, and crushing rice husks, carbonizing the crushed rice husks at high temperature in an inert gas to generate porous silicon carbon, and then dissolving the impurities with dilute acid. The purified silicon carbon is then immersed in a solution containing negative oxygen ion materials, ultrasonically treated, and dried to obtain the product.

[0032] If negative ion materials are directly added to the raw material components of polypropylene composite materials, the negative ion materials may be covered by dust and moisture due to long-term exposure to the air, or the crystal structure may be destroyed due to high temperature during processing, causing the release of negative oxygen ions to gradually decrease over time; this application uses rice husk silicon carbon coating to protect the powder surface and extend the functional release cycle; compared with inorganic mineral fillers, rice husk silicon carbon achieves lightweight polypropylene composite materials.

[0033] The negative oxygen ion material is tourmaline nano powder or negative ion powder.

[0034] The rice husk is crushed into 100-200 mesh, and the crushed rice husk is carbonized in nitrogen at 600-800℃ for 2-4 hours to obtain porous silicon carbon, and then impurities are removed with dilute hydrochloric acid or dilute sulfuric acid.

[0035] The mass of negative oxygen ion materials in the loaded rice husk charcoal accounts for 5-20% of the mass of the rice husk silicon carbon. This is the range of the amount of negative oxygen ion materials that the loaded rice husk charcoal can accommodate.

[0036] The polypropylene is either homopolypropylene or copolymer polypropylene, or a mixture of both.

[0037] The polypropylene melt index is 25 g / 10 min to 55 g / 10 min, and copolymerized polypropylene prepared by hydrogenation process is preferred.

[0038] The compatible toughening agent is one of maleic anhydride grafted and epoxy grafted polyolefin copolymers; preferably, non-grafted maleic anhydride grafted ethylene-octene copolymer (POE-g-MAH) is more environmentally friendly;

[0039] The antioxidant is one or a mixture of antioxidant 1010, antioxidant 168, antioxidant DSTP, antioxidant 3114, and antioxidant 619F;

[0040] The lubricant is one or a mixture of paraffin wax, polyethylene wax, stearic acid, stearic acid metal salt, ethylene bis stearic acid amide, and ethylene acrylic acid copolymer metal salt;

[0041] The light stabilizer is a hindered amine light stabilizer;

[0042] The coupling agent is a silane coupling agent, preferably γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0043] The present invention also provides a method for preparing a rice husk silicon-carbon modified polypropylene composite material, which comprises the following steps:

[0044] S1. After washing, drying, and crushing the rice husk, the crushed rice husk is carbonized at high temperature in an inert gas to produce porous silicon carbon, which is then dissolved with dilute acid to remove impurities; the purified silicon carbon is then immersed in a solution containing a negative oxygen ion material, and the supported rice husk carbon is obtained after ultrasonic treatment and drying;

[0045] S2. According to the raw material formula of the rice husk silicon-carbon modified polypropylene composite material, polypropylene, supported rice husk carbon, compatible toughening agent, antioxidant, lubricant, light stabilizer, and coupling agent are weighed in sequence;

[0046] S3, placing polypropylene, supported rice husk char, compatible toughening agent, antioxidant, lubricant, light stabilizer, and coupling agent in a mixer at a mixing temperature of 50-80° C. and performing high-speed premixing to obtain a premix;

[0047] S4, continuously introducing nitrogen into the twin-screw extruder, and adding the premix prepared in step S3 into the main hopper of the twin-screw extruder, controlling the extruder processing temperature at 180-200° C., and the screw speed at 350-500 r / min, and pelletizing after melt extrusion through the twin-screw extruder. When the twin-screw extruder starts to discharge, controlling the vacuum degree in the barrel of the twin-screw extruder at -0.02-0.05 MPa; vacuuming helps to emit odors and VOC small molecules generated during the processing, thereby reducing the odor level of the material;

[0048] S5. The mixture particles obtained in step S4 are placed in a homogenous mixing and drying apparatus and homogenized and dried for at least 1 hour at a temperature of 70°C to 90°C and a vacuum degree of -0.02 MPa to -0.05 MPa to obtain the rice husk silicon-carbon modified polypropylene composite material. The pellets are then baked and dried at high temperature under vacuum conditions and further devolatilized to reduce the odor level of the material and improve its environmental friendliness.

[0049] The present invention also provides automobile interior and exterior decoration parts prepared by using the rice husk silicon-carbon modified polypropylene composite material.

[0050] The technical solution of the present invention is described in detail below with reference to the embodiments and comparative examples:

[0051] Example 1:

[0052] The rice husk silicon-carbon modified polypropylene composite material comprises the following raw materials in parts by weight:

[0053] 70 parts of polypropylene,

[0054] 16 parts of supported rice husk charcoal,

[0055] Compatible toughening agent POE-g-MAH 12 parts,

[0056] 1.1 parts of antioxidant DSTDP,

[0057] Lubricant polyethylene wax 1.4 parts,

[0058] Light stabilizer UV 622 0.3 parts,

[0059] 1.3 parts of coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane;

[0060] The method for preparing the rice husk silicon-carbon modified polypropylene composite material comprises the following steps:

[0061] 1. Wash, dry and crush the rice husk to 180 mesh. Carbonize the crushed rice husk at 700℃ for 3 hours in a nitrogen atmosphere to generate porous silicon carbon. Finally, use dilute sulfuric acid to remove impurities and improve the purity of silicon carbon to obtain porous rice husk carbon.

[0062] 2. Immerse the porous rice husk charcoal in a solution containing tourmaline nanopowder, ultrasonicate it for 3 hours, and then dry it in an oven at 80°C to obtain the supported rice husk charcoal;

[0063] 3. Weigh 70 parts of polypropylene, 16 parts of supported rice husk charcoal, 12 parts of POE-g-MAH, 1.1 parts of antioxidant DSTDP, 1.4 parts of polyethylene wax, 0.3 parts of UV622, and 1.3 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane in order by weight;

[0064] 4. Place the above-mentioned polypropylene, supported rice husk char, POE-g-MAH, polyethylene wax, antioxidant DSTDP, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and UV 622 in a mixer at a mixing temperature of 70°C and a high speed of 350 r / min for 8 minutes to obtain a premix;

[0065] 5. Continuously introduce nitrogen into the twin-screw extruder, and add the premix in step 4 into the main hopper of the twin-screw extruder. Control the extruder processing temperature at 190°C and the screw speed at 350r / min. After melt extrusion through the twin-screw extruder, cut the pellets. When the twin-screw extruder starts to discharge, turn on the vacuum pump and control the vacuum degree in the barrel of the twin-screw extruder at 0.05MPa.

[0066] 6. The mixture particles obtained in step 5 were placed in a homogenous mixing and drying device, and homogenized and dried for 4 hours at a temperature of 80° C. and a vacuum degree of 0.05 MPa to obtain a rice husk silicon-carbon modified polypropylene composite material.

[0067] Example 2:

[0068] The rice husk silicon-carbon modified polypropylene composite material comprises the following raw materials in parts by weight:

[0069] 80 parts of polypropylene,

[0070] 5 parts of supported rice husk charcoal,

[0071] 3 parts of compatible toughening agent POE-g-MAH,

[0072] Antioxidant DSTDP 0.2 parts,

[0073] Lubricant polyethylene wax 0.5 parts,

[0074] Light stabilizer UV 622 0.5 parts,

[0075] 0.5 parts of coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane;

[0076] The method for preparing the rice husk silicon-carbon modified polypropylene composite material comprises the following steps:

[0077] 1. Wash, dry and crush the rice husk to 180 mesh. Carbonize the crushed rice husk at 700℃ for 3 hours in a nitrogen atmosphere to generate porous silicon carbon. Finally, use dilute sulfuric acid to remove impurities and improve the purity of silicon carbon to obtain porous rice husk carbon.

[0078] 2. Immerse the porous rice husk charcoal in a solution containing tourmaline nanopowder, ultrasonicate it for 3 hours, and then dry it in an oven at 80°C to obtain the supported rice husk charcoal;

[0079] 3. Weigh 80 parts of polypropylene, 5 parts of supported rice husk charcoal, 3 parts of POE-g-MAH, 0.2 parts of antioxidant DSTDP, 0.5 parts of polyethylene wax, 0.5 parts of UV 622, and 0.5 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane in order by weight;

[0080] 4. Place the above-mentioned polypropylene, supported rice husk char, POE-g-MAH, polyethylene wax, antioxidant DSTDP, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and UV 622 in a mixer at a mixing temperature of 70°C and a high speed of 350 r / min for 8 minutes to obtain a premix;

[0081] 5. Continuously introduce nitrogen into the twin-screw extruder, and add the premix in step 4 into the main hopper of the twin-screw extruder. Control the extruder processing temperature at 190°C and the screw speed at 350r / min. After melt extrusion through the twin-screw extruder, cut the pellets. When the twin-screw extruder starts to discharge, turn on the vacuum pump and control the vacuum degree in the barrel of the twin-screw extruder at 0.05MPa.

[0082] 6. The mixture particles obtained in step 5 were placed in a homogenous mixing and drying device, and homogenized and dried for 4 hours at a temperature of 80° C. and a vacuum degree of 0.05 MPa to obtain a rice husk silicon-carbon modified polypropylene composite material.

[0083] Example 3:

[0084] The rice husk silicon-carbon modified polypropylene composite material comprises the following raw materials in parts by weight:

[0085] 75 parts of polypropylene,

[0086] 10 parts of supported rice husk charcoal,

[0087] 8 parts of compatible toughening agent POE-g-MAH,

[0088] 0.8 parts of antioxidant DSTDP,

[0089] Lubricant polyethylene wax 0.8 parts,

[0090] Light stabilizer UV 622 0.7 parts,

[0091] 0.9 parts of coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane;

[0092] The method for preparing the rice husk silicon-carbon modified polypropylene composite material comprises the following steps:

[0093] 1. Wash, dry and crush the rice husk to 180 mesh. Carbonize the crushed rice husk at 700℃ for 3 hours in a nitrogen atmosphere to generate porous silicon carbon. Finally, use dilute sulfuric acid to remove impurities and improve the purity of silicon carbon to obtain porous rice husk carbon.

[0094] 2. Immerse the porous rice husk charcoal in a solution containing negative ion powder, ultrasonically treat for 3 hours, and then place it in an oven at 80°C for drying to obtain the supported rice husk charcoal;

[0095] 3. Weigh 75 parts of polypropylene, 10 parts of supported rice husk charcoal, 8 parts of POE-g-MAH, 0.8 parts of antioxidant DSTDP, 0.8 parts of polyethylene wax, 0.7 parts of UV 622, and 0.9 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane in order by weight;

[0096] 4. Place the above-mentioned polypropylene, supported rice husk char, POE-g-MAH, polyethylene wax, antioxidant DSTDP, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and UV 622 in a mixer at a mixing temperature of 70°C and a high speed of 350 r / min for 8 minutes to obtain a premix;

[0097] 5. Continuously introduce nitrogen into the twin-screw extruder, and add the premix in step 4 into the main hopper of the twin-screw extruder. Control the extruder processing temperature at 190°C and the screw speed at 350r / min. After melt extrusion through the twin-screw extruder, cut the pellets. When the twin-screw extruder starts to discharge, turn on the vacuum pump and control the vacuum degree in the barrel of the twin-screw extruder at 0.05MPa.

[0098] 6. The mixture particles obtained in step 5 were placed in a homogenous mixing and drying device, and homogenized and dried for 4 hours at a temperature of 80° C. and a vacuum degree of 0.05 MPa to obtain a rice husk silicon-carbon modified polypropylene composite material.

[0099] Example 4:

[0100] The rice husk silicon-carbon modified polypropylene composite material comprises the following raw materials in parts by weight:

[0101] 65 parts of polypropylene,

[0102] 20 parts of supported rice husk charcoal,

[0103] Compatible toughening agent POE-g-MAH 15 parts,

[0104] 1.5 parts of antioxidant DSTDP,

[0105] Lubricant polyethylene wax 2 parts,

[0106] 1 part of light stabilizer UV 622,

[0107] 1.5 parts of coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane;

[0108] The method for preparing the rice husk silicon-carbon modified polypropylene composite material comprises the following steps:

[0109] 1. Wash, dry and crush the rice husk to 180 mesh. Carbonize the crushed rice husk at 700℃ for 3 hours in a nitrogen atmosphere to generate porous silicon carbon. Finally, use dilute sulfuric acid to remove impurities and improve the purity of silicon carbon to obtain porous rice husk carbon.

[0110] 2. Immerse the porous rice husk charcoal in a solution containing tourmaline nanopowder, ultrasonicate it for 3 hours, and then dry it in an oven at 80°C to obtain the supported rice husk charcoal;

[0111] 3. Weigh 65 parts of polypropylene, 20 parts of supported rice husk charcoal, 15 parts of POE-g-MAH, 1.5 parts of antioxidant DSTDP, 2 parts of polyethylene wax, 1 part of UV 622, and 1.5 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane in order by weight;

[0112] 4. Place the above-mentioned polypropylene, supported rice husk char, POE-g-MAH, polyethylene wax, antioxidant DSTDP, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and UV 622 in a mixer at a mixing temperature of 70°C and a high speed of 350 r / min for 8 minutes to obtain a premix;

[0113] 5. Continuously introduce nitrogen into the twin-screw extruder, and add the premix in step 4 into the main hopper of the twin-screw extruder. Control the extruder processing temperature at 190°C and the screw speed at 350r / min. After melt extrusion through the twin-screw extruder, cut the pellets. When the twin-screw extruder starts to discharge, turn on the vacuum pump and control the vacuum degree in the barrel of the twin-screw extruder at 0.05MPa.

[0114] 6. The mixture particles obtained in step 5 were placed in a homogenous mixing and drying device, and homogenized and dried for 4 hours at a temperature of 80° C. and a vacuum degree of 0.05 MPa to obtain a rice husk silicon-carbon modified polypropylene composite material.

[0115] Comparative Example 1:

[0116] The polypropylene composite material comprises the following raw materials in parts by weight:

[0117] 70 parts of polypropylene,

[0118] 16 parts of talcum powder,

[0119] Compatible toughening agent POE-g-MAH 12 parts,

[0120] 1.1 parts of antioxidant DSTDP,

[0121] Lubricant polyethylene wax 1.4 parts,

[0122] Light stabilizer UV 622 0.3 parts,

[0123] 1.3 parts of coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane;

[0124] The preparation method of the above-mentioned polypropylene composite material comprises the following steps:

[0125] 1. Weigh 70 parts of polypropylene, 16 parts of talc, 12 parts of compatible toughening agent POE-g-MAH, 1.1 parts of antioxidant DSTDP, 1.4 parts of lubricant polyethylene wax, 0.3 parts of light stabilizer UV 622, and 1.3 parts of coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane in order by weight;

[0126] 2. Place the above-mentioned polypropylene, talc, POE-g-MAH, polyethylene wax, antioxidant DSTDP, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and UV 622 in a mixer at a mixing temperature of 70°C and a high speed mixing rate of 350 r / min for 8 minutes to obtain a premix;

[0127] 3. Continuously introduce argon into the twin-screw extruder, and add the premix in step 4 into the main hopper of the twin-screw extruder. Control the extruder processing temperature at 190°C and the screw speed at 350r / min. After melt extrusion through the twin-screw extruder, cut the pellets. When the twin-screw extruder starts to discharge, turn on the vacuum pump and control the vacuum degree in the barrel of the twin-screw extruder to 0.05MPa.

[0128] 4. The mixture particles obtained in step 3 were placed in a homogenous mixing and drying device, and homogenized and dried for 4 hours at a temperature of 80° C. and a vacuum degree of 0.05 MPa to obtain a polypropylene composite material.

[0129] Comparative Example 2:

[0130] The polypropylene composite material comprises the following raw materials in parts by weight:

[0131] 80 parts of polypropylene,

[0132] 5 parts of talcum powder,

[0133] 3 parts of compatible toughening agent POE-g-MAH,

[0134] 0.5 parts of antioxidant DSTDP,

[0135] Lubricant polyethylene wax 0.8 parts,

[0136] Light stabilizer UV 622 0.5 parts,

[0137] 0.5 parts of coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane;

[0138] The preparation method of the above-mentioned polypropylene composite material comprises the following steps:

[0139] 1. Weigh 80 parts of polypropylene, 5 parts of talc, 3 parts of compatible toughening agent POE-g-MAH, 0.5 parts of antioxidant DSTDP, 0.8 parts of lubricant polyethylene wax, 0.5 parts of light stabilizer UV 622, and 0.5 parts of coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane in order by weight;

[0140] 2. Place the above-mentioned polypropylene, talc, POE-g-MAH, polyethylene wax, antioxidant DSTDP, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and UV 622 in a mixer at a mixing temperature of 70°C and a high speed mixing rate of 350 r / min for 8 minutes to obtain a premix;

[0141] 3. Continuously introduce argon into the twin-screw extruder, and add the premix in step 4 into the main hopper of the twin-screw extruder. Control the extruder processing temperature at 190°C and the screw speed at 350r / min. After melt extrusion through the twin-screw extruder, cut the pellets. When the twin-screw extruder starts to discharge, turn on the vacuum pump and control the vacuum degree in the barrel of the twin-screw extruder to 0.05MPa.

[0142] 4. The mixture particles obtained in step 3 were placed in a homogenous mixing and drying device, and homogenized and dried for 4 hours at a temperature of 80° C. and a vacuum degree of 0.05 MPa to obtain a polypropylene composite material.

[0143] Comparative Example 3:

[0144] The polypropylene composite material comprises the following raw materials in parts by weight:

[0145] 65 parts of polypropylene,

[0146] 20 parts of talcum powder,

[0147] Compatible toughening agent POE-g-MAH 15 parts,

[0148] 1.5 parts of antioxidant DSTDP,

[0149] Lubricant polyethylene wax 2 parts,

[0150] 1 part of light stabilizer UV 622,

[0151] 1.5 parts of coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane;

[0152] The above-mentioned method for preparing the polypropylene composite material comprises the following steps:

[0153] 1. Weigh 65 parts of polypropylene, 20 parts of talc, 15 parts of compatible toughening agent POE-g-MAH, 1.5 parts of antioxidant DSTDP, 2 parts of lubricant polyethylene wax, 1 part of light stabilizer UV 622, and 1.5 parts of coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane in order by weight;

[0154] 2. Place the above-mentioned polypropylene, talc, POE-g-MAH, polyethylene wax, antioxidant DSTDP, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and UV 622 in a mixer at a mixing temperature of 70°C and a high speed mixing rate of 350 r / min for 8 minutes to obtain a premix;

[0155] 3. Continuously introduce nitrogen into the twin-screw extruder, and add the premix in step 4 into the main hopper of the twin-screw extruder. Control the extruder processing temperature at 190°C and the screw speed at 350r / min. After melt extrusion through the twin-screw extruder, pelletize. When the twin-screw extruder starts to discharge, turn on the vacuum pump and control the vacuum degree in the barrel of the twin-screw extruder at 0.05MPa.

[0156] 4. The mixture particles obtained in step 3 were placed in a homogenous mixing and drying device, and homogenized and dried for 4 hours at a temperature of 80° C. and a vacuum degree of 0.05 MPa to obtain a polypropylene composite material.

[0157] Table 1 is a table showing the composition of the polypropylene composite materials of Examples 1 to 4 and Comparative Examples 1 to 3, as shown below:

[0158]

[0159] Table 2 shows the test data obtained by testing the rice husk silicon-carbon modified polypropylene composite materials prepared in Examples 1 to 4 and the polypropylene composite materials prepared in Comparative Examples 1 to 3 according to the unified standard.

[0160]

[0161] The performance and odor tests were conducted according to the following standards:

[0162] (1) Density: in accordance with GB / T 1033.1

[0163] (2) Tensile strength: in accordance with GB / T 1040.2

[0164] (3) Flexural modulus: in accordance with GB / T 9341

[0165] (4) Impact strength: in accordance with GB / T 1043.1

[0166] (5) Odor: According to VDA 270

[0167] (6) Negative oxygen ion release: According to JC / T 2110-2012 indoor air ion concentration test method.

[0168] Note: Odor evaluation score level (lower the better):

[0169] 1 point: no odor detected;

[0170] 2 points: The smell can be felt but is not irritating to humans;

[0171] 3 points: The odor is clearly felt, but not irritating to humans;

[0172] 4 points: The odor can be clearly felt and is irritating to people;

[0173] 5 points: The smell is very irritating to people;

[0174] 6 points: The smell is very irritating and unbearable.

[0175] The mechanical performance parameters of Examples 1 to 4 show that the mechanical properties of the rice husk silicon-carbon modified polypropylene composite material have been greatly improved, the odor level has been reduced, and the release of negative oxygen ions is more beneficial to the health of the occupants and improves the riding comfort; the loaded rice husk carbon as a filler makes the material lightweight.

[0176] Comparing Example 4 with Examples 1 to 3, the weight portion of the loaded rice husk charcoal added is the largest, and the odor level of the prepared rice husk silicon-carbon modified polypropylene composite material is the lowest among Examples 1 to 4, and the negative oxygen ion release is the highest. This indicates that the more loaded rice husk charcoal is added, the lower the odor level of the polypropylene composite material and the greater the negative oxygen ion release. However, the other mechanical parameters of Example 4 are not the best, indicating that the components of the polypropylene composite material need to cooperate with each other to obtain a rice husk silicon-carbon modified polypropylene composite material with low odor, large negative oxygen ion release, and high mechanical properties. This proves that the weight portions of the raw materials of this application are obtained after complex and in-depth research and experiments.

[0177] Example 1 and Comparative Example 1, Example 2 and Comparative Example 2, Example 4 and Comparative Example 3 are compared respectively. The filler used in the example is loaded rice husk charcoal, while the filler used in the comparative example is talcum powder. The weight proportions of the components corresponding to each other in Example 1 and Comparative Example 1, Example 2 and Comparative Example 2, and Example 4 and Comparative Example 3 are the same. From Table 2, it can be seen that the performance parameters of the prepared polypropylene composite material are as follows: although the mechanical parameters of the example are slightly inferior to those of the comparative example, the mechanical properties are still greatly improved, which can meet the needs of automotive interior and exterior parts; the odor level of the example is much lower than that of the comparative example, and the polypropylene composite material prepared in the example can continuously release negative oxygen ions, while the comparative example cannot release negative oxygen ions. In summary, it can be concluded that the mechanical properties of the rice husk silicon carbon modified polypropylene composite material prepared by the component formula of the example are not much different from those of the polypropylene composite material prepared in the comparative example with inorganic mineral powder as filler, and the odor level is lower, it has an air purification function, greatly improves the riding experience, and achieves lightweight material.

[0178] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A rice husk silicon-carbon modified polypropylene composite material, characterized in that: The invention comprises the following components by weight: 65-80 parts of polypropylene; 5-20 parts of supported rice husk charcoal; 3-15 parts of compatible toughening agent; 0.2-1.5 parts of antioxidant; 0.5-2 parts of lubricant; 0.3-1 parts of light stabilizer and 0.5-1.5 parts of coupling agent, wherein the supported rice husk charcoal is rice husk charcoal containing negative oxygen ions.

2. The rice husk silicon-carbon modified polypropylene composite material according to claim 1, characterized in that: The loaded rice husk charcoal is prepared by washing, drying and crushing rice husks, carbonizing the crushed rice husks at high temperature in an inert gas to generate porous silicon carbon, and then dissolving the carbon with dilute acid to remove impurities. The purified silicon carbon is then immersed in a solution containing a negative oxygen ion material, ultrasonically treated and dried.

3. The rice husk silicon-carbon modified polypropylene composite material according to claim 2, characterized in that: The negative oxygen ion material is tourmaline nano powder or negative ion powder.

4. The rice husk silicon-carbon modified polypropylene composite material according to claim 2, characterized in that: The rice husk is crushed into 100-200 meshes, and the crushed rice husk is carbonized in nitrogen at 600-800° C. for 2-4 hours to prepare porous silicon carbon, and then impurities are removed using dilute hydrochloric acid or dilute sulfuric acid.

5. The rice husk silicon-carbon modified polypropylene composite material according to claim 1, characterized in that: The mass of the negative oxygen ion material in the supported rice husk charcoal accounts for 5-20% of the mass of the rice husk silicon charcoal.

6. The rice husk silicon-carbon modified polypropylene composite material according to claim 1, characterized in that: The polypropylene is homopolymer polypropylene or copolymer polypropylene, or a mixture of the two.

7. The rice husk silicon-carbon modified polypropylene composite material according to claim 1, characterized in that: The polypropylene melt index is 25 g / 10min~55 g / 10min.

8. The rice husk silicon-carbon modified polypropylene composite material according to claim 1, characterized in that: The compatible toughening agent is one of maleic anhydride grafted and epoxy grafted polyolefin copolymers; The antioxidant is one or a mixture of antioxidant 1010, antioxidant 168, antioxidant DSTP, antioxidant 3114, and antioxidant 619F; The lubricant is one or a mixture of paraffin wax, polyethylene wax, stearic acid, stearic acid metal salt, ethylene bis stearic acid amide, and ethylene acrylic acid copolymer metal salt; The light stabilizer is a hindered amine light stabilizer; The coupling agent is a silane coupling agent.

9. A method for preparing a rice husk silicon-carbon modified polypropylene composite material, for preparing the rice husk silicon-carbon modified polypropylene composite material according to any one of claims 1 to 8, characterized in that the steps include: S1. After washing, drying and crushing the rice husk, the crushed rice husk is carbonized at high temperature in an inert gas to form porous silicon carbon, and impurities are removed by dissolving with dilute acid; The purified silicon carbon is then immersed in a solution containing negative oxygen ion materials, and then subjected to ultrasonic treatment and drying to obtain supported rice husk carbon; S2. According to the raw material formula of the rice husk silicon-carbon modified polypropylene composite material, polypropylene, supported rice husk carbon, compatible toughening agent, antioxidant, lubricant, light stabilizer, and coupling agent are weighed in sequence; S3, placing polypropylene, supported rice husk char, compatible toughening agent, antioxidant, lubricant, light stabilizer, and coupling agent in a mixer at a mixing temperature of 50-80° C. and performing high-speed premixing to obtain a premix; S4, nitrogen is continuously introduced into the twin-screw extruder, and the premix prepared in step S3 is added to the main hopper of the twin-screw extruder, the extruder processing temperature is controlled at 180-200 ° C, the screw speed is controlled at 350-500 r / min, and the pellets are cut after melt extrusion by the twin-screw extruder. When the twin-screw extruder starts to discharge, the vacuum degree in the barrel of the twin-screw extruder is controlled at -0.02-0.05 MPa; S5. Place the mixture particles obtained in step S4 in a homogenous mixing and drying device, and homogenize and dry them for more than 1 hour at a temperature of 70-90° C. and a vacuum degree of -0.02-0.05 MPa to obtain the rice husk silicon-carbon modified polypropylene composite material.

10. Automobile interior and exterior parts, characterized in that: The composite material is prepared by using the rice husk silicon-carbon modified polypropylene composite material according to any one of claims 1 to 8.

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