Scratch-resistant straw wood-plastic co-extrusion profile and preparation process thereof

Abstract

The invention relates to the technical field of wood-plastic co-extrusion plates, in particular to a scratch-resistant straw wood-plastic co-extrusion profile which comprises a base plate and a coating layer, the base plate comprises 30%-40% of waste plastics, 20%-35% of waste wood fibers, 5%-10% of inorganic filler, 3%-8% of flame retardant, 1%-3% of lubricant, 2%-5% of auxiliaries and 1%-3% of antioxidant; the coating layer comprises 0.5%-1% of a fiber reinforced material, 1%-1.5% of filling particles, 35%-40% of waste plastic, 20%-35% of waste rubber, 20%-35% of refined resin, 4%-8% of a flame retardant, 2%-5% of a lubricant, 3%-6% of an auxiliary agent, 1%-3% of an antioxidant and 2%-5% of a coloring agent. According to the wood-plastic co-extrusion plate, waste materials are recycled, most waste materials are adopted, and very few high-cost materials are adopted, so that the scratch resistance of the wood-plastic co-extrusion plate is guaranteed, and meanwhile, the manufacturing cost can be greatly saved.

Description

Technical Field

[0001] The invention relates to a scratch-resistant straw wood-plastic co-extruded profile, in particular to a scratch-resistant straw wood-plastic co-extruded profile and a preparation process thereof, belonging to the technical field of wood-plastic co-extruded boards. Background Art

[0002] Wood-plastic co-extrusion profiles refer to profile products made of wood-plastic composite materials as core materials and acrylonitrile-styrene-acrylate terpolymer (ASA), polymethyl methacrylate (PMMA), modified polyethylene (PE) or other polymers as surface materials through co-extrusion molding technology; This profile combines the advantages of two or more materials, significantly improves the performance of the raw materials, and overcomes the shortcomings of a single material. Compared with traditional wood-plastic materials, wood-plastic products produced by co-extrusion technology overcome fatal shortcomings such as fading, mildew, and cracking. Its advantages include stronger surface decoration design effects (such as wood texture, wood layering, and metal material effects), high-quality wear resistance, high surface strength and not easy to scratch, lower water absorption, excellent mildew resistance, outstanding physical properties (such as tensile strength, bending strength) and longer service life; The numerous advantages of wood-plastic composite materials have led to a rapid market growth. The rapidly expanding market has put forward higher performance requirements for the wider application of wood-plastic composite materials. For example, in the fields of outdoor construction, transportation, packaging, etc., wood-plastic materials are required to have high strength and good scratch resistance. At the same time, they still have good scratch resistance after outdoor exposure and aging, so as to increase the service life of wood-plastic materials. At present, the main method to enhance the scratch resistance of wood-plastic composite materials is to add inorganic fillers with higher hardness to the materials to improve the scratch resistance and extend the service life. However, the price of inorganic fillers is generally high, and the amount added is large. If added according to the usage amount, it will greatly increase the cost of the raw materials of wood-plastic profiles.

[0003] Therefore, it is urgent to improve the scratch-resistant straw-wood-plastic co-extruded profile to solve the above-mentioned problems. Summary of the invention

[0004] The purpose of the present invention is to provide a scratch-resistant straw wood-plastic co-extruded profile and a preparation process thereof, to recycle waste materials, to use more waste materials and to use very few high-cost materials, so that the scratch resistance of the wood-plastic co-extruded board itself is ensured and the manufacturing cost can be greatly saved.

[0005] In order to achieve the above-mentioned purpose, the main technical scheme adopted by the present invention includes: a scratch-resistant straw wood-plastic co-extruded profile, including a substrate and a coating layer, wherein the substrate includes 30%-40% of waste plastics, 20%-35% of waste wood fibers, 5%-10% of inorganic fillers, 3%-8% of flame retardants, 1%-3% of lubricants, 2%-5% of additives, and 1%-3% of antioxidants; The coating layer includes 0.5%-1% fiber reinforcement material, 1%-1.5% filling particles, 35%-40% waste plastics, 20%-35% waste rubber, 20%-35% refined resin, 4%-8% flame retardant, 2%-5% lubricant, 3%-6% additive, 1%-3% antioxidant, and 2%-5% colorant.

[0006] Preferably, the waste plastics are a mixture of one or more of polyethylene PE, polypropylene PP, and polyvinyl chloride PVC; Through the above technical scheme, waste plastics can be used as one of the raw materials for wood-plastic co-extrusion profiles after being crushed, cleaned and reprocessed before use. After being mixed with wood fibers, the hardness and wear resistance of the wood-plastic material can be increased, thereby improving its anti-scratch performance.

[0007] Preferably, the waste wood fiber is a mixture of one or more of waste furniture, construction wood waste and wood packaging materials; Through the above technical solution, wood fiber, as the main wood component in wood-plastic co-extrusion profiles, can be mixed with other raw materials after proper treatment and processing. The fiber structure of waste wood can enhance the strength and hardness of wood-plastic materials, while the addition of wood fiber can improve its processing performance and physical properties.

[0008] Preferably, the waste rubber is a mixture of one or more of waste rubber or waste tires; Through the above technical scheme, waste rubber can be used as a toughening agent for wood-plastic co-extrusion profiles after crushing and processing. The addition of rubber can improve the toughness and impact resistance of wood-plastic materials, making them more durable, and can also increase their hardness to a certain extent.

[0009] Preferably, the refined resin is extracted from waste paper, discarded packaging boxes and waste textiles; Through the above technical solution, the materials extracted from waste paper, discarded packaging boxes and waste textiles can be used as fillers for wood-plastic co-extruded profiles after fiberization treatment, increasing their volume and density while providing a certain hardness.

[0010] Preferably, the inorganic filler is a mixture of one or more of calcium carbonate, wollastonite, talc, and clay, and the flame retardant is a halogen flame retardant, a phosphorus flame retardant, and a nitrogen flame retardant; Through the above technical scheme, the inorganic fillers specifically use talcum powder and clay, etc., which have good chemical stability and thermal stability and can play a role of reinforcement and filling in the wood-plastic co-extruded profile. The flame retardant specifically uses a nitrogen-based flame retardant, which can chemically react with the combustible components in the material, thereby inhibiting the spread of flames and improving its fireproof effect.

[0011] Preferably, the lubricant is one of stearic acid and stearate, the auxiliary agent is a mixture of one or more of a plasticizer, a stabilizer and an antistatic agent, the antioxidant is a phenolic antioxidant, and the colorant is a mixture of one or more pigments; Through the above technical scheme, the lubricant plays a role in reducing friction and improving fluidity in the production process of wood-plastic co-extrusion profiles, which is helpful to improve the surface quality and processing performance of the product. The additives use the above three at the same time, which can improve the stability of the substrate during use and the antistatic effect. The antioxidant uses a phenolic antioxidant to prevent oxidation of the substrate.

[0012] Preferably, the fiber reinforcement material is one or more of glass fiber, carbon fiber and aramid fiber, and the filling particles are one or more of mineral powder, ceramic particles and nanoparticles, and the fiber reinforcement material and filling particles are rarely used; Through the above technical scheme, the dye can use the corresponding pigment according to the demand to realize the later coloring treatment of the substrate. The fiber reinforcement material adopts glass fiber, and the fiber reinforcement material and filling particles are rarely used. The filling particles adopt mineral powder that is easier to blend. The use of a very small amount of fiber reinforcement material and filling particles can ensure the scratch resistance and hardness of the wood-plastic co-extruded board itself while ensuring the reduction of manufacturing costs.

[0013] A preparation process of a scratch-resistant straw-wood-plastic co-extruded profile comprises the following steps: S1: Crushing and grinding of waste materials: First, crush and grind the base plate according to the composition ratio of 30%-40% of waste plastic and 20%-35% of waste wood fiber, and classify and store them; then crush and grind the surface layer according to the composition ratio of 35%-40% of waste plastic, 20%-35% of waste rubber and 20%-35% of refined resin, and classify and store them; S2: Substrate and surface layer mixing and granulation: 2.1: Substrate granulation and mixing: 5%-10% of inorganic filler, 3%-8% of flame retardant, 1%-3% of lubricant, 2%-5% of additive and 1%-3% of antioxidant are taken out and put into a crusher and a grinder for crushing and grinding, then 30%-40% of the crushed and polished waste plastics and 20%-35% of waste wood fiber are taken out and put into the grinder again for grinding and mixing, and finally the mixed materials are mixed in a high-speed mixer for 6 minutes, and the whole mixing process is controlled below 65°C; then the mixed surface layer materials are added to the granulation extruder for granulation to obtain substrate granules; 2.2: Coating layer mixing and granulation: 0.5%-1% of fiber reinforcement material, 1%-1.5% of filling particles, 4%-8% of flame retardant, 2%-5% of lubricant, 3%-6% of additives, and 1%-3% of antioxidant are taken out and put into a crusher and a grinder for crushing and grinding. Then, 35%-40% of the crushed and polished waste plastics, 20%-35% of waste rubber, and 20%-35% of refined resin are put into the grinder again for grinding and mixing. Finally, the mixed materials are mixed in a high-speed mixer for 12 minutes, and the whole mixing process is controlled below 130°C; then the mixed surface material is added to the granulation extruder for granulation to obtain coating layer granules; S3: Mixing, extruding and coloring: The surface pellets and substrate materials obtained in S2 are dried and sent to the co-extrusion auxiliary machine, and then the main extruder and the auxiliary extruder are turned on. After the two materials pass through the co-extrusion die, a scratch-resistant co-extruded wood-plastic profile is obtained. Then, 2%-5% of the dye is taken out, and the surface of the obtained scratch-resistant co-extruded wood-plastic profile is colored, and finally the profile is put into a dryer for drying.

[0014] Preferably, the rotation speed of the co-extrusion auxiliary machine in S3 is 8-20r / min, the temperature is 160-190°C, the rotation speed of the co-extrusion main machine is 6-10r / min, the temperature is 160-185°C, the temperature of the co-extrusion mold is 150-170, the temperature of the dryer is 120°C-140°C, and the drying time of the dryer is 20min-30min.

[0015] The present invention has at least the following beneficial effects: 1. By utilizing waste plastics, waste wood fibers, inorganic fillers, flame retardants, lubricants, additives, antioxidants, fiber-reinforced materials, filling particles, waste plastics, waste rubber, refined resins, flame retardants, lubricants, additives, antioxidants and dyes, waste materials can be recycled when manufacturing wood-plastic co-extrusion profiles. More waste materials are used, and very few high-cost materials are used. This not only ensures the scratch resistance of the wood-plastic co-extrusion board itself, but also greatly saves manufacturing costs, and also achieves environmental protection and resource conservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 is a flow chart of the preparation process of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the straw-wood-plastic co-extruded profile of the present invention.

[0017] In the figure, 1-substrate; 2-coating layer. DETAILED DESCRIPTION

[0018] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0019] It includes a substrate and a coating layer. The substrate includes 30%-40% of waste plastics, 20%-35% of waste wood fibers, 5%-10% of inorganic fillers, 3%-8% of flame retardants, 1%-3% of lubricants, 2%-5% of additives, and 1%-3% of antioxidants. The coating layer includes 0.5%-1% fiber reinforcement material, 1%-1.5% filling particles, 35%-40% waste plastics, 20%-35% waste rubber, 20%-35% refined resin, 4%-8% flame retardant, 2%-5% lubricant, 3%-6% additive, 1%-3% antioxidant and 2%-5% colorant.

[0020] A preparation process of a scratch-resistant straw-wood-plastic co-extruded profile comprises the following steps: S1: Crushing and grinding of waste materials: First, crush and grind the base plate according to the composition ratio of 30%-40% of waste plastic and 20%-35% of waste wood fiber, and classify and store them; then crush and grind the surface layer according to the composition ratio of 35%-40% of waste plastic, 20%-35% of waste rubber and 20%-35% of refined resin, and classify and store them; S2: Substrate and surface layer mixing and granulation: 2.1: Substrate granulation and mixing: 5%-10% of inorganic filler, 3%-8% of flame retardant, 1%-3% of lubricant, 2%-5% of additive and 1%-3% of antioxidant are taken out and put into a crusher and a grinder for crushing and grinding, then 30%-40% of the crushed and polished waste plastics and 20%-35% of waste wood fiber are taken out and put into the grinder again for grinding and mixing, and finally the mixed materials are mixed in a high-speed mixer for 6 minutes, and the whole mixing process is controlled below 65°C; then the mixed surface layer materials are added to the granulation extruder for granulation to obtain substrate granules; 2.2: Coating layer mixing and granulation: 0.5%-1% of fiber reinforcement material, 1%-1.5% of filling particles, 4%-8% of flame retardant, 2%-5% of lubricant, 3%-6% of additives, and 1%-3% of antioxidant are taken out and put into a crusher and a grinder for crushing and grinding. Then, 35%-40% of the crushed and polished waste plastics, 20%-35% of waste rubber, and 20%-35% of refined resin are put into the grinder again for grinding and mixing. Finally, the mixed materials are mixed in a high-speed mixer for 12 minutes, and the whole mixing process is controlled below 130°C; then the mixed surface material is added to the granulation extruder for granulation to obtain coating layer granules; S3: Mixed extrusion and coloring: The surface pellets and substrate materials obtained in S2 are dried and sent to the co-extrusion auxiliary machine, and then the main extruder and the auxiliary extruder are turned on. After the two materials pass through the co-extrusion die, a scratch-resistant co-extruded plastic wood profile is obtained, and then 2%-5% of the dye is taken out to color the surface of the obtained scratch-resistant co-extruded plastic wood profile, and finally put into the dryer for drying. In S3, the speed of the co-extrusion auxiliary machine is 8-20r / min, the temperature is 160-190°C, the speed of the co-extrusion main machine is 6-10r / min, the temperature is 160-185°C, the temperature of the co-extrusion die is 150-170, the temperature of the dryer is 120°C-140°C, and the drying time of the dryer is 20min-30min; Waste plastics use one or more mixtures of polyethylene PE, polypropylene PP, and polyvinyl chloride PVC. Waste plastics specifically use a mixture of polyethylene PE and polypropylene PP. Before use, after being crushed, cleaned and reprocessed, they can be used as one of the raw materials for wood-plastic co-extrusion profiles. After being mixed with wood fiber, the hardness and wear resistance of the wood-plastic material can be increased, thereby improving its anti-scratch performance; waste wood fiber uses one or more mixtures of waste furniture, construction wood waste, and wood packaging materials. These materials are the main wood components in the wood-plastic co-extrusion profiles. After proper treatment and processing, they can be mixed with other raw materials. The fiber structure of waste wood can enhance the strength and hardness of the wood-plastic material, and the addition of wood fiber can improve its processing performance and physical properties; waste rubber uses one or more mixtures of waste rubber or waste tires. After being crushed and processed, the waste rubber can be used as a toughening agent for wood-plastic co-extrusion profiles. The addition of rubber can improve the toughness and impact resistance of the wood-plastic material, making it more durable, and can also increase its hardness to a certain extent; Refined resin is extracted from waste paper, discarded packaging boxes and waste textiles. After fiberization, these materials can be used as fillers for wood-plastic co-extruded profiles to increase their volume and density while providing a certain hardness. The inorganic filler is a mixture of one or more of calcium carbonate, wollastonite, talcum powder, and clay. The flame retardant is a halogen flame retardant, a phosphorus flame retardant, and a nitrogen flame retardant. The inorganic filler specifically uses talcum powder and clay, etc. They have good chemical stability and thermal stability and can play a role in reinforcing and filling in the wood-plastic co-extruded profile. The flame retardant specifically uses a nitrogen flame retardant, which can react chemically with the combustible components in the material, thereby inhibiting the spread of flames and improving its fireproof effect. The lubricant is one of stearic acid and stearate. The lubricant plays a role in reducing friction and improving fluidity in the production process of the wood-plastic co-extruded profile, which helps to improve the surface quality and processing performance of the product. The auxiliary agent is a mixture of one or more of a plasticizer, a stabilizer, and an antistatic agent. The additives adopt the above three at the same time, which can improve the stability and antistatic effect of the substrate during use. The antioxidant adopts phenolic antioxidant to prevent the oxidation of the substrate. The dye adopts a mixture of one or more pigments, and the corresponding pigments can be used according to the needs to achieve the later coloring treatment of the substrate; the fiber reinforcement material adopts one or more of glass fiber, carbon fiber and aramid fiber, the fiber reinforcement material adopts glass fiber, and the filling particles adopt one or more of mineral powder, ceramic particles and nanoparticles. The fiber reinforcement material and the filling particles are rarely used, and the filling particles adopt mineral powder that is easier to integrate. The use of a very small amount of fiber reinforcement materials and filling particles can ensure the reduction of manufacturing costs while also ensuring the scratch resistance and hardness of the wood-plastic co-extruded board itself.

[0021] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0022] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0023] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A scratch-resistant straw-wood-plastic co-extruded profile, comprising a substrate (1) and a coating layer (2), Features: The substrate (1) comprises 30%-40% of waste plastic, 20%-35% of waste wood fiber, 5%-10% of inorganic filler, 3%-8% of flame retardant, 1%-3% of lubricant, 2%-5% of additive, and 1%-3% of antioxidant; The coating layer (2) comprises 0.5%-1% of fiber reinforcement material, 1%-1.5% of filler particles, 35%-40% of waste plastics, 20%-35% of waste rubber, 20%-35% of refined resin, 4%-8% of flame retardant, 2%-5% of lubricant, 3%-6% of additive, 1%-3% of antioxidant, and 2%-5% of dye.

2. A scratch-resistant straw-wood-plastic co-extruded profile according to claim 1, Features: The waste plastics are a mixture of one or more of polyethylene PE, polypropylene PP, and polyvinyl chloride PVC.

3. A scratch-resistant straw-wood-plastic co-extruded profile according to claim 1, Features: The waste wood fibers are a mixture of one or more of waste furniture, construction wood waste and wood packaging materials.

4. The scratch-resistant straw-wood-plastic co-extruded profile according to claim 1, Features: The waste rubber is a mixture of one or more of waste rubber and waste tires.

5. The scratch-resistant straw-wood-plastic co-extruded profile according to claim 1, Features: The refined resin is extracted from waste paper, discarded packaging boxes and waste textiles.

6. The scratch-resistant straw-wood-plastic co-extruded profile according to claim 1, Features: The inorganic filler is a mixture of one or more of calcium carbonate, wollastonite, talcum powder and clay, and the flame retardant is a halogen flame retardant, a phosphorus flame retardant and a nitrogen flame retardant.

7. The scratch-resistant straw-wood-plastic co-extruded profile according to claim 1, Features: The lubricant is one of stearic acid and stearate, the auxiliary agent is a mixture of one or more of plasticizer, stabilizer and antistatic agent, the antioxidant is a phenolic antioxidant, and the colorant is a mixture of one or more pigments.

8. The scratch-resistant straw-wood-plastic co-extruded profile according to claim 1, Features: The fiber reinforcement material is one or more of glass fiber, carbon fiber and aramid fiber, and the filling particles are one or more of mineral powder, ceramic particles and nanoparticles. The fiber reinforcement material and filling particles are rarely used.

9. A preparation process for a scratch-resistant straw-wood-plastic co-extrusion profile. Features: The steps include: S1: Crushing and grinding of waste materials: First, crush and grind the base plate according to the composition ratio of 30%-40% of waste plastic and 20%-35% of waste wood fiber, and classify and store them; then crush and grind the surface layer according to the composition ratio of 35%-40% of waste plastic, 20%-35% of waste rubber and 20%-35% of refined resin, and classify and store them; S2: Substrate and surface layer mixing and granulation: 2.1: Substrate granulation and mixing: 5%-10% of inorganic filler, 3%-8% of flame retardant, 1%-3% of lubricant, 2%-5% of additive and 1%-3% of antioxidant are taken out and put into a crusher and a grinder for crushing and grinding, then 30%-40% of the crushed and polished waste plastics and 20%-35% of waste wood fiber are taken out and put into the grinder again for grinding and mixing, and finally the mixed materials are mixed in a high-speed mixer for 6 minutes, and the whole mixing process is controlled below 65°C; then the mixed surface layer materials are added to the granulation extruder for granulation to obtain substrate granules; 2.2: Coating layer mixing and granulation: 0.5%-1% of fiber reinforcement material, 1%-1.5% of filling particles, 4%-8% of flame retardant, 2%-5% of lubricant, 3%-6% of additives, and 1%-3% of antioxidant are taken out and put into a crusher and a grinder for crushing and grinding. Then, 35%-40% of the crushed and polished waste plastics, 20%-35% of waste rubber, and 20%-35% of refined resin are put into the grinder again for grinding and mixing. Finally, the mixed materials are mixed in a high-speed mixer for 12 minutes, and the whole mixing process is controlled below 130°C; then the mixed surface material is added to the granulation extruder for granulation to obtain coating layer granules; S3: Mixing, extruding and coloring: The surface pellets and substrate materials obtained in S2 are dried and sent to the co-extrusion auxiliary machine, and then the main extruder and the auxiliary extruder are turned on. After the two materials pass through the co-extrusion die, a scratch-resistant co-extruded wood-plastic profile is obtained. Then, 2%-5% of the dye is taken out, and the surface of the obtained scratch-resistant co-extruded wood-plastic profile is colored, and finally the profile is put into a dryer for drying.

10. The preparation process of the scratch-resistant straw-wood-plastic co-extruded profile according to claim 9, Features: The rotation speed of the co-extrusion auxiliary machine in S3 is 8-20r / min, the temperature is 160-190°C, the rotation speed of the co-extrusion main machine is 6-10r / min, the temperature is 160-185°C, the temperature of the co-extrusion mold is 150-170, the temperature of the dryer is 120°C-140°C, and the drying time of the dryer is 20min-30min.

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