Processing method of epoxy resin reinforced wood-plastic material and product thereof

Abstract

The invention discloses a processing method of an epoxy resin reinforced wood-plastic material and a product thereof. The processing method comprises the following steps: S1, conveying the reinforced fibers into the resin tank, and immersing the reinforced fibers into the degradable epoxy resin; s2, reinforced fibers are conveyed to a pre-curing system, and pre-cured resin is obtained; s3, conveying the wood-plastic granulated material and the pre-cured resin into a co-extrusion mold; s4, the elastic layer material and the surface layer material are subjected to high-temperature processing through a first co-extruder and high-temperature processing through a second co-extruder and then enter a co-extrusion mold; and S5, a wood-plastic profile is obtained through co-extrusion mold forming, the wood-plastic profile and the film are conveyed to an online embossing system for film covering and embossing treatment, and then the epoxy resin reinforced wood-plastic material and a product thereof are obtained through a cooling system and a cutting system. And S6, recycling the waste epoxy resin reinforced wood-plastic material and the product thereof to obtain micromolecular epoxy resin and recycled fibers. While the overall rigidity of the material is maintained, the elasticity and toughness of the surface layer of the composite material are improved by adding the elastic layer.

Description

Technical Field

[0001] The invention belongs to the technical field of composite material manufacturing and relates to a processing method of epoxy resin reinforced wood-plastic material. Background Art

[0002] Wood-plastic composite materials are a kind of recyclable green and environmentally friendly new materials made from waste thermoplastics, biomass fibers and various processing aids through extrusion, injection molding, hot pressing, 3D printing and other processes. They are widely used in garden landscapes such as outdoor decking, pavilions, pergolas, fences, wall panels, etc. However, due to the low strength of the main raw material polyolefin, the wood-plastic composite materials on the market generally lack strength and are difficult to use in engineering fields with high requirements for product performance, thus limiting the high-end application of wood-plastic composite materials.

[0003] In order to solve the problem of insufficient mechanical properties of wood plastic products, academia and industry have conducted a lot of exploration, which can be divided into the following aspects: (1) Using various engineering plastics such as PA, PET, ABS, etc. to replace polyolefins. Engineering plastics themselves have excellent performance, but their melting point and processing temperature are often high, while biomass fibers have poor thermal stability. Even if the melting point is lowered by plastic modification, the actual processing difficulty is still relatively large. For example, the melt viscosity is greatly increased, making it difficult to extrude stably; (2) Adding various reinforcing fibers such as glass fiber and carbon fiber to polyolefins or wood plastics, but due to the strong shearing effect of the extruder screw, the viscosity will increase. Strong fibers are sheared and become fibers with a relatively small length-diameter ratio, and the interface bonding between the fibers and the wood-plastic matrix is ​​poor, resulting in limited actual reinforcement effect; (3) Biomass fibers, such as hemp fibers and bamboo fibers, are modified by physical and chemical methods to improve the interface bonding force, but due to the limitations of fiber strength and the strong shearing effect of the extrusion screw, it is difficult to achieve a reinforcement effect in practice; (4) By using wood strips, aluminum alloys and other materials as core materials and co-extruding wood-plastic, the strength of the resulting product is greatly improved, but the cost and energy consumption of aluminum alloys are high, and wood strips are very absorbent. They are prone to absorbing water, swelling and cracking when used outdoors, so actual industrialization faces great difficulties.

[0004] Thermosetting resins such as epoxy resins are added with glass fiber, carbon fiber and other reinforcing fibers to prepare high-strength composite materials. They can be used as structural materials to partially replace metal materials. The products are widely used. They are used as reinforcing materials and co-extruded with wood plastics to meet the requirements in terms of cost and performance. However, since thermosetting resins are non-degradable, they are difficult to recycle and reprocess, and waste pollutes the environment. Therefore, the consensus in the wood plastic industry is that if thermosetting resins are used to reinforce wood plastics, they will become non-recyclable composite materials, which runs counter to green and environmentally friendly wood plastic products. Therefore, how to prepare wood plastic composite materials with moderate cost, green and renewable, and high performance has become a difficult problem for the wood plastic industry. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a processing method for epoxy resin reinforced wood-plastic material and its products that overcome the defects of the existing materials and have better performance. The technical solution adopted by the present invention is: a processing method for epoxy resin reinforced wood-plastic material, having the following steps: S1, conveying the reinforcing fiber to the resin tank through the yarn supply system, and immersing it in the degradable epoxy resin; S2, conveying the reinforcing fiber soaked with the degradable epoxy resin to the precuring system to obtain the precured resin; S3, subjecting the wood-molding pellets to high-temperature processing through the extruder, entering the co-extrusion mold, and conveying the precured resin to the co-extrusion mold; S4, subjecting the elastic layer material to high-temperature processing through the first co-extruder, entering the co-extrusion mold, and subjecting the surface layer material to high-temperature processing through the second co-extruder, entering the co-extrusion mold; S5, forming through the co-extrusion mold to obtain to the wood-plastic profile, transport it and the film to the online embossing system for laminating and embossing treatment, and then pass through the cooling system and the cutting system to obtain the epoxy resin reinforced wood-plastic material and its products; S6, recycle the waste epoxy resin reinforced wood-plastic material and its products, and obtain recycled epoxy resin particles and recycled wood-plastic particles by one or more combinations of cutting, planing, milling, grinding and crushing, and pyrolyze and / or acidolyze the recycled epoxy resin particles to obtain small molecule epoxy resin and recycled fiber; the recycled wood-plastic particles and recycled fiber are used to prepare the wood-plastic pellets required in step S3, and the small molecule epoxy resin is used to prepare the degradable epoxy resin required in step S1.

[0006] As a further improvement of the above method, the degradable epoxy resin comprises a degradable epoxy resin matrix and a curing agent, the degradable epoxy resin matrix contains one or more combinations of Schiff base bonds, disulfide bonds, hexahydrotriazine bonds, and acetal structures, and the curing agent is an amine curing agent; the reinforcing fiber is one or more combinations of glass fiber, basalt fiber, carbon fiber, wood fiber, and bamboo fiber, and the form of the reinforcing fiber is one or more combinations of fiber yarn, fiber cloth, and fiber felt.

[0007] As a further improvement of the above method, the wood plastic pellets contain the following components, and the weight proportions of each component are: PE: 20-30 parts, MAPE: 3-30 parts, biomass fiber: 10-65 parts, paraffin: 2-5 parts, calcium stearate: 2-5 parts; recycled fiber: 3-10 parts; recycled wood plastic particles: 5-10 parts.

[0008] As a further improvement of the above method, the elastic layer material comprises the following components, and the weight proportions of each component are: thermoplastic elastomer: 90-95 parts, DCP: 0.2-1 parts, MAH: 4-9.2 parts; the thermoplastic elastomer is one or more combinations of TPE, TPR, TPU, TPO, and TPV.

[0009] As a further improvement of the above method, the surface material comprises the following components, and the weight proportions of each component are respectively: ultra-high molecular weight polyethylene: 62-88 parts, MAPE: 5-15 parts, EVA: 5-15 parts, antioxidant 1010: 1-3 parts, pigment: 1-5 parts; the film comprises the following components: PVC: 30-75 parts, plasticizer: 10-30 parts, stabilizer: 5-10 parts; alumina: 10-30 parts.

[0010] As a further improvement of the above method, the co-extrusion mold includes an interface, a mold body, a transition plate, a bracket plate, a busbar, a die, a first co-extrusion plate, a second co-extrusion plate, and a third co-extrusion plate. The upper surface of the busbar is provided with a curing resin connection, and the pre-cured resin enters the co-extrusion mold through the pre-cured resin connection; a first co-extruder connection is provided on the side of the first co-extrusion plate, which is connected to the first co-extruder; a second co-extruder connection is provided on the side of the second co-extrusion plate, which is connected to the second co-extruder, and the first co-extruder and the second co-extruder are arranged on both sides of the co-extrusion mold.

[0011] As a further improvement of the above method, the yarn supply system is composed of a column, a yarn drum, a yarn guide plate, and a slot. The column has a plurality of slots, and the slots are composed of two movable blocks and screws. The movable blocks are fixed to the column by screws. The yarn drum and the yarn guide plate are connected to the column through the slots, and the reinforcing fibers are wound on the yarn drum. The yarn guide plate includes a yarn guide hole and / or a cloth guide hole, and the yarn guide hole is composed of one or more round holes.

[0012] As a further improvement of the above method, it also includes an online embossing system connected to the co-extrusion die; the online embossing system includes a film roller, a plain roller and an embossing roller; a film is wound around the film roller, and the film is conveyed to the plain roller and the embossing roller to coat and emboss the wood-plastic profile; the surface of the plain roller is smooth, and the surface of the embossing roller is engraved with patterns.

[0013] As a further improvement of the above method, it also includes a cooling system and a cutting system, which are sequentially arranged after the online embossing system, and are used to cool and cut to obtain epoxy resin reinforced wood-plastic materials and products thereof; the pre-curing system is one or more combinations of microwave drying, ultraviolet curing, and infrared drying; and one or more ultrasonic vibrators are installed on the surface of the co-extrusion mold.

[0014] Preferably, the epoxy resin reinforced wood-plastic material product prepared by any one of the above methods comprises a coating layer, a surface layer, an elastic layer, a base layer and a core layer.

[0015] The beneficial effects of the present invention are:

[0016] 1. The degradable epoxy resin and reinforcing fiber are pre-cured in the pre-curing system, so that the surface of the degradable epoxy resin still has some highly active epoxy groups. In the co-extrusion mold, these epoxy groups can undergo a ring-opening reaction with the hydroxyl groups and anhydride groups in the wood plastic pellets to produce covalent bonds, thereby enhancing the interfacial bonding force between the degradable epoxy resin and the wood plastic.

[0017] 2. The wood-plastic composite materials on the market contain a high amount of biomass fibers filled with good rigidity, but poor toughness and elasticity. The present invention increases the elasticity and toughness of the surface layer of the composite material while maintaining the overall rigidity of the material, thereby expanding its scope of application. By using DCP and MAH to carry out an in-situ grafting reaction on the thermoplastic elastomer, the thermoplastic elastomer is grafted with MAH groups, which can react chemically with the biomass fibers of the base layer and the surface layer respectively, thereby improving the interfacial bonding force between the elastic layer and the base layer and the surface layer. The surface layer uses ultra-high molecular weight polyethylene as the main material, combined with an online embossing system, so as to provide tear-resistant and realistic wood-grain wood-plastic products. The surface layer is covered with a layer of film to increase wear resistance, thereby protecting the three-dimensional wood grain from wear and tear and increasing the service life of the product.

[0018] 3. The unique design of the co-extrusion mold can ensure that the four materials enter the mold from four different parts, and under the conditions of high temperature and high pressure in the mold, corresponding chemical reactions occur at the interface, which improves the bonding force of each interface. Combined with the online embossing system, it finally forms a five-layer high-performance epoxy resin reinforced wood-plastic material and its products with a coating layer, a surface layer, an elastic layer, a base layer, and a core layer.

[0019] 4. The flow channel length of the co-extrusion die is limited. If only relying on heat and pressure, the interface reaction is not sufficient. Therefore, multiple ultrasonic vibrators are installed on the surface of the co-extrusion die to provide additional energy on the one hand and increase the contact of the molecules on the interface on the other hand, thereby intensifying the chemical reaction rate and reaction probability, making the interface reaction more sufficient and further improving the bonding strength of each interface.

[0020] 5. The wood-plastic products of the present invention can be recycled as a whole after being discarded, and can be separated into recycled epoxy resin particles and recycled wood-plastic particles through mechanical processing. The recycled epoxy resin particles can be degraded into low-molecular epoxy resins under high temperature or acidic conditions due to the dynamic covalent chemical bonds they contain. The reinforcing fibers in the resin can be non-destructively recycled for processing wood-plastic or other materials, while the low-molecular epoxy resin can be used to prepare degradable epoxy resins, and the recycled wood-plastic particles can be used to prepare wood-plastic materials, so that thermosetting epoxy resins, thermoplastic plastics and other additives can be repeatedly recycled and processed in the wood-plastic products of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a side view of the processing equipment of the epoxy resin reinforced wood-plastic material in the present invention.

[0022] Figure 2 It is a top view of the processing equipment of the epoxy resin reinforced wood-plastic material in the present invention.

[0023] Figure 3 It is the left side view of the coextrusion die in the present invention.

[0024] Figure 4 Right side view of the coextrusion die.

[0025] Figure 5 Top view of the coextrusion die.

[0026] Figure 6 Front view of the yarn supply system.

[0027] Figure 7 Side view of the yarn supply system.

[0028] Figure 8 Schematic diagram of the card slot installation structure in the yarn supply system.

[0029] Fig. 9 Schematic diagram of the movable block in the card slot installation structure.

[0030] Fig.10 Schematic diagram of the online embossing system.

[0031] Fig.11 Schematic diagram of epoxy resin reinforced wood plastic material. DETAILED DESCRIPTION

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the embodiments are briefly described below. Obviously, what is described is only a part of the embodiments of the present invention, not all of them, and those skilled in the art can also obtain other design solutions based on the schematic diagram without paying creative work.

[0033] like Figures 1 to 11As shown, the present invention provides a processing method for epoxy resin reinforced wood-plastic material, which has the following steps: S1, conveying the reinforcing fiber to the resin tank through the yarn supply system, and immersing it in the degradable epoxy resin; S2, conveying the reinforcing fiber soaked with the degradable epoxy resin to the precuring system to obtain the precured resin; S3, subjecting the wood-plastic pellets to high-temperature processing through an extruder, entering the co-extrusion mold, and conveying the precured resin to the co-extrusion mold; S4, subjecting the elastic layer material to high-temperature processing through a first co-extruder, entering the co-extrusion mold, and subjecting the surface layer material to high-temperature processing through a second co-extruder, entering the co-extrusion mold; S5, forming through the co-extrusion mold to obtain The wood-plastic profile and the film are transported to the online embossing system for laminating and embossing, and then the epoxy resin reinforced wood-plastic material and its products are obtained through the cooling system and the cutting system; S6, the waste epoxy resin reinforced wood-plastic material and its products are recycled, and the recycled epoxy resin particles and recycled wood-plastic particles are obtained by cutting, planing, milling, grinding, crushing or one or more combinations thereof, and the recycled epoxy resin particles are subjected to pyrolysis and / or acid hydrolysis to obtain small molecule epoxy resin and recycled fiber; the recycled wood-plastic particles and recycled fiber are used to prepare the wood-plastic granules required for step S3, and the small molecule epoxy resin is used to prepare the degradable epoxy resin required for step S1. The beneficial effect of this embodiment is: breaking the industry taboo that thermosetting epoxy resin cannot be used in wood-plastic composite materials, using the combination of degradable epoxy resin with dynamic covalent bonds and reinforcing fibers to improve the strength of wood-plastic composite materials, and the product can be recycled and reused after being discarded.

[0034] As a further improvement of the above method, the degradable epoxy resin comprises a degradable epoxy resin matrix and a curing agent, wherein the degradable epoxy resin matrix contains one or more combinations of Schiff base bonds, disulfide bonds, hexahydrotriazine bonds, and acetal structures, and the curing agent is an amine curing agent. The reinforcing fiber is one or more combinations of glass fiber, basalt fiber, carbon fiber, wood fiber, and bamboo fiber, and the form of the reinforcing fiber is one or more combinations of fiber yarn, fiber cloth, and fiber felt. The beneficial effect of this embodiment is that the epoxy resin has a dynamic covalent bond, and when the composite material is discarded and recycled, the epoxy resin with a three-dimensional network cross-linked structure is degraded into a small molecule compound by high temperature or acidic conditions, and the degradable epoxy resin can be prepared again, and the reinforcing fiber in the epoxy resin can be recycled without loss, so that the epoxy resin and the reinforcing fiber can be recycled repeatedly, and truly become a green recyclable material. In addition, the strength of the epoxy resin itself is not too high, and only by adding reinforcing fibers to prepare composite materials can the mechanical properties of metal materials such as steel be achieved or exceeded. The types and forms of reinforcing fibers are diverse, and the performance and cost of the products prepared are different, so that products can be customized for different customers and application sites.

[0035] As a further improvement of the above method, the wood plastic pellets contain the following components, and the weight proportions of each component are: PE: 20-30 parts, MAPE: 3-30 parts, biomass fiber: 10-65 parts, paraffin: 2-5 parts, calcium stearate: 2-5 parts; recycled fiber: 3-10 parts; recycled wood plastic particles: 5-10 parts. The beneficial effect of this embodiment is that after the wood plastic material and its products of the present invention are used and recycled, except for the epoxy resin, the remaining components including the reinforcing fiber can be used as raw materials to prepare the wood plastic base layer of the present invention again.

[0036] As a further improvement of the above method, the elastic layer material comprises the following components, and the weight proportions of each component are respectively: thermoplastic elastomer: 90-95 parts, DCP: 0.2-1 parts, MAH: 4-9.2 parts. The thermoplastic elastomer is one or more combinations of TPE, TPR, TPU, TPO, and TPV. The beneficial effect of this embodiment is: while ensuring that the overall rigidity of the product is not reduced, the elasticity and toughness of the surface layer are improved, and people can experience a better foot feel when stepping on the product.

[0037] As a further improvement of the above method, the surface material comprises the following components, and the weight proportions of each component are respectively: ultra-high molecular weight polyethylene: 62-88 parts, MAPE: 5-15 parts, EVA: 5-15 parts, antioxidant 1010: 1-3 parts, pigment: 1-5 parts. The film comprises the following components: PVC: 30-75 parts, plasticizer: 10-30 parts, stabilizer: 5-10 parts; aluminum oxide: 10-30 parts. The beneficial effects of this implementation scheme are: MAPE can react chemically with the elastic layer and the core layer of wood plastic to improve the interface bonding force. EVA and ultra-high molecular weight polyethylene ensure that the surface layer is tear-resistant, and the coating layer contains aluminum oxide, which can improve the wear resistance of the material, thereby increasing the service life of the wood plastic.

[0038] like Figures 3 to 5 As shown, as a further improvement of the above method, the co-extrusion die includes an interface, a die body, a transition plate, a bracket plate, a manifold, a die, a first co-extrusion plate, a second co-extrusion plate, and a third co-extrusion plate. The upper surface of the manifold is provided with a curing resin connection, and the pre-cured resin enters the co-extrusion die through the pre-cured resin connection; the first co-extrusion plate is provided with a first co-extruder connection on the side, which is connected to the first co-extruder; the second co-extrusion plate is provided with a second co-extruder connection on the side, which is connected to the second co-extruder. The first co-extruder and the second co-extruder are arranged on both sides of the co-extrusion die. The beneficial effect of this embodiment is that the co-extrusion die structure of the present invention allows epoxy resin, elastic layer material, surface material, and wood-plastic base layer to enter the die in a certain order, and the high pressure and high temperature of the die cause chemical reactions at each interface, thereby improving the bonding strength of each interface.

[0039] like Figures 6 to 9 As shown, as a further improvement of the above method, the yarn supply system is composed of a column, a yarn drum, a yarn guide plate, and a slot. The column has a plurality of slots, and the slots are composed of two movable blocks and screws. The movable blocks are fixed to the column by screws, and the yarn drum and the yarn guide plate are connected to the column through the slots. The reinforcing fibers are wound on the yarn drum. The yarn guide plate includes a yarn guide hole and / or a cloth guide hole, and the yarn guide hole is composed of one or more circular holes. The beneficial effect of this embodiment is that various forms of reinforcing fibers such as continuous fibers, fiber mats, and fiber cloth can be transported to the next process through the yarn guide plate, thereby solving the problem that different forms of fibers require different equipment. In addition, the design of the slot makes it easier to install and disassemble the reinforcing fibers. At the same time, the slot is modular and universal, and the position and quantity of the yarn drum and the yarn guide plate can be flexibly adjusted to meet the needs of the process.

[0040] like Fig.10 As shown, as a further improvement of the above method, an online embossing system is also included, which is connected to the co-extrusion mold. The online embossing system includes a film roller, a plain roller and an embossing roller. A film is wrapped around the film roller, and the film is transported to the plain roller and the embossing roller to coat and emboss the wood-plastic profile. The surface of the plain roller is smooth, and the surface of the embossing roller is engraved with patterns. The beneficial effect of this embodiment is that the temperature of the wood-plastic product extruded from the mold is relatively high, and the online embossing system can easily extrude deeper textures on the wood-plastic surface to form realistic wood grains. A layer of transparent wear-resistant plastic film is coated on the surface to increase wear resistance and improve the service life of the product.

[0041] like Figure 2 As shown, as a further improvement of the above method, it also includes a cooling system and a cutting system, which are sequentially arranged after the online embossing system, for cooling and cutting to obtain epoxy resin reinforced wood-plastic materials and products thereof. The precuring system is a combination of one or more of microwave drying, ultraviolet curing, and infrared drying. One or more ultrasonic vibrators are installed on the surface of the co-extrusion mold. The beneficial effect of this embodiment is that after the epoxy resin is precured, some epoxy groups are still unreacted, so that the epoxy resin can be chemically reacted with the adjacent materials in the co-extrusion mold, thereby improving the interface bonding force. In addition, the ultrasonic vibrator can intensify the vibration of the molecules, increase the contact opportunity of each molecule, accelerate the reaction rate and reaction probability, and thus improve the bonding force of each interface.

[0042] like Fig.11As shown, preferably, the epoxy resin reinforced wood-plastic material product prepared by any of the above methods comprises a coating layer, a surface layer, an elastic layer, a base layer, and a core layer. The beneficial effect of this embodiment is that after being processed by the online embossing system, the surface layer has realistic three-dimensional wood grain and is wear-resistant, the elastic layer has good toughness and elasticity, the base layer provides the product skeleton, and the core layer has extremely high mechanical strength, thereby improving the overall strength of the product.

[0043] Example 1:

[0044] The weight proportions of the components of the wood plastic pellets are: PE: 25 parts, MAPE: 5 parts, wood fiber: 55 parts, paraffin: 3 parts, calcium stearate: 2 parts; recycled fiber: 5 parts; recycled wood plastic particles: 5 parts.

[0045] The weight proportions of the components of the elastic layer material are: TPE: 94 parts, DCP: 0.5 parts, MAH: 5.5 parts.

[0046] The weight proportions of the components of the surface material are: ultra-high molecular weight polyethylene: 85 parts, MAPE: 5 parts, EVA: 5 parts, antioxidant 1010: 1 part, and pigment: 4 parts.

[0047] The weight proportions of the components of the film are as follows: PVC: 40 parts, plasticizer: 30 parts, stabilizer: 10 parts, and aluminum oxide: 20 parts.

[0048] The glass fiber cloth is immersed in a biodegradable epoxy resin and an amine curing agent containing an acetal structure through a yarn supply system, and a pre-cured resin is obtained through an infrared drying pre-curing system and transported to a co-extrusion mold. The wood plastic pellets are extruded into the co-extrusion mold at high temperature through an extruder, and the elastic layer material and the surface layer material are extruded into the co-extrusion mold at high temperature through two co-extruders, respectively, to obtain a wood plastic profile with a four-layer structure. An ultrasonic vibrator is installed on the upper surface, lower surface, and two side surfaces of the co-extrusion mold. Subsequently, the film coating and embossing treatment are carried out through an online embossing system, and finally, an epoxy resin reinforced wood plastic product with a five-layer structure is obtained through a cooling system and a cutting system.

[0049] Example 2:

[0050] The weight proportions of the components of the wood plastic pellets are: PE: 30 parts, MAPE: 5 parts, wood fiber: 50 parts, paraffin: 3 parts, calcium stearate: 2 parts; recycled fiber: 5 parts; recycled wood plastic particles: 5 parts.

[0051] The weight proportions of the components of the elastic layer material are: TPV: 93.5 parts, DCP: 0.5 parts, MAH: 6 parts.

[0052] The weight proportions of the components of the surface material are as follows: ultra-high molecular weight polyethylene: 80 parts, MAPE: 10 parts, EVA: 5 parts, antioxidant 1010: 1 part, and pigment: 4 parts.

[0053] The weight proportions of the components of the film are as follows: PVC: 30 parts, plasticizer: 30 parts, stabilizer: 10 parts, and aluminum oxide: 30 parts.

[0054] The basalt fiber yarn is immersed in the degradable epoxy resin and amine curing agent containing Schiff base bonds through the yarn supply system, and the pre-cured resin is obtained through the infrared drying pre-curing system and transported to the co-extrusion mold. The wood plastic pellets are extruded into the co-extrusion mold at high temperature through the extruder, and the elastic layer material and the surface layer material are extruded into the co-extrusion mold at high temperature through two co-extruders, respectively, to obtain a wood plastic profile with a four-layer structure. An ultrasonic vibrator is installed on the upper and lower surfaces of the co-extrusion mold. Then, it passes through the online embossing system for lamination and embossing, and finally, the epoxy resin reinforced wood plastic product with a five-layer structure is obtained through the cooling system and cutting system.

[0055] Example 3:

[0056] The weight proportions of the components of the wood plastic pellets are: PE: 28 parts, MAPE: 10 parts, wood fiber: 45 parts, paraffin: 3 parts, calcium stearate: 2 parts; recycled fiber: 6 parts; recycled wood plastic particles: 6 parts.

[0057] The weight proportions of the components of the elastic layer material are: TPE: 91 parts, DCP: 0.4 parts, MAH: 8.6 parts.

[0058] The weight proportions of the components of the surface material are: ultra-high molecular weight polyethylene: 75 parts, MAPE: 10 parts, EVA: 10 parts, antioxidant 1010: 1 part, and pigment: 4 parts.

[0059] The weight proportions of the components of the film are as follows: PVC: 50 parts, plasticizer: 25 parts, stabilizer: 10 parts, and aluminum oxide: 15 parts.

[0060] The carbon fiber cloth is immersed in a biodegradable epoxy resin containing disulfide bonds and an amine curing agent through a yarn supply system, and a pre-cured resin is obtained through a microwave drying pre-curing system and transported to a co-extrusion mold. The wood plastic pellets are extruded into the co-extrusion mold at high temperature through an extruder, and the elastic layer material and the surface layer material are extruded into the co-extrusion mold through two co-extruders at high temperature, respectively, to obtain a wood plastic profile with a four-layer structure. An ultrasonic vibrator is installed on the upper surface, lower surface, and two side surfaces of the co-extrusion mold. Subsequently, the film is coated and embossed through an online embossing system, and finally a five-layer structure of epoxy resin reinforced wood plastic products is obtained through a cooling system and a cutting system.

[0061]

Claims

1. A method for processing epoxy resin reinforced wood-plastic material, characterized in that: The steps are as follows: S1, conveying the reinforcing fiber (1) to the resin tank (3) through the yarn supply system (2), and immersing the reinforcing fiber (1) in the degradable epoxy resin (4); S2, transporting the reinforcing fiber (1) impregnated with the degradable epoxy resin (4) to a precuring system (5) to obtain a precured resin (6); S3, the wood molding pellets are processed at high temperature by an extruder (7), enter a co-extrusion mold (8), and the pre-cured resin (6) is transported into the co-extrusion mold (8); S4, the elastic layer material is processed at high temperature through a first co-extruder (9) and enters a co-extrusion die (8), and the surface layer material is processed at high temperature through a second co-extruder (10) and enters a co-extrusion die (8); S5, after being formed by a co-extrusion die (8) to obtain a wood-plastic profile (14), the profile and the film (16) are transported to an online embossing system (11) for lamination and embossing, and then the epoxy resin reinforced wood-plastic material (15) and its products are obtained by a cooling system (12) and a cutting system (13); S6, recycling the waste epoxy resin reinforced wood-plastic material (15) and its products, obtaining recycled epoxy resin particles and recycled wood-plastic particles by one or more combinations of cutting, planing, milling, grinding and crushing, and subjecting the recycled epoxy resin particles to pyrolysis and / or acid hydrolysis to obtain small molecule epoxy resin and recycled fiber; the recycled wood-plastic particles and recycled fiber are used to prepare the wood-plastic pellets required in step S3, and the small molecule epoxy resin is used to prepare the degradable epoxy resin required in step S1.

2. The method for processing epoxy resin reinforced wood-plastic material according to claim 1, characterized in that: The degradable epoxy resin comprises a degradable epoxy resin matrix and a curing agent, wherein the degradable epoxy resin matrix contains one or more combinations of Schiff base bonds, disulfide bonds, hexahydrotriazine bonds, and acetal structures, and the curing agent is an amine curing agent; the reinforcing fiber is one or more combinations of glass fiber, basalt fiber, carbon fiber, wood fiber, and bamboo fiber, and the form of the reinforcing fiber is one or more combinations of fiber yarn, fiber cloth, and fiber felt.

3. The method for processing epoxy resin reinforced wood-plastic material according to claim 1, characterized in that: The wood shaping pellets include the following components, and the weight percentages of the components are: PE: 20-30 parts, MAPE: 3-30 parts, biomass fiber: 10-65 parts, paraffin: 2-5 parts, calcium stearate: 2-5 parts; recycled fiber: 3-10 parts; recycled wood plastic particles: 5-10 parts.

4. The method for processing epoxy resin reinforced wood-plastic material according to claim 1, characterized in that: The elastic layer material comprises the following components, and the weight proportions of the components are respectively: thermoplastic elastomer: 90-95 parts, DCP: 0.2-1 parts, MAH: 4-9.2 parts, and the thermoplastic elastomer is one or more combinations of TPE, TPR, TPU, TPO, and TPV.

5. The method for processing epoxy resin reinforced wood-plastic material according to claim 1, characterized in that: The surface material comprises the following components, and the weight proportions of the components are respectively: ultra-high molecular weight polyethylene: 62-88 parts, MAPE: 5-15 parts, EVA: 5-15 parts, antioxidant 1010: 1-3 parts, pigment: 1-5 parts; the film comprises the following components: PVC: 30-75 parts, plasticizer: 10-30 parts, stabilizer: 5-10 parts; Alumina: 10-30 parts.

6. The method for processing epoxy resin reinforced wood-plastic material according to claim 1, characterized in that: The co-extrusion die (8) comprises an interface (81), a die body (82), a transition plate (83), a bracket plate (84), a busbar (85), a die (86), a first co-extrusion plate (87), a second co-extrusion plate (88), and a third co-extrusion plate (89). The upper surface of the busbar (85) is provided with a pre-cured resin connection (851), and the pre-cured resin (6) enters the co-extrusion die (8) through the pre-cured resin connection (851); the side of the first co-extrusion plate (87) is provided with a first co-extruder connection (871), which is connected to the first co-extruder (9); the side of the second co-extrusion plate (88) is provided with a second co-extruder connection (881), which is connected to the second co-extruder (10); the first co-extruder (9) and the second co-extruder (10) are arranged on both sides of the co-extrusion die (8).

7. The method for processing epoxy resin reinforced wood-plastic material according to claim 1, characterized in that: The yarn supply system (2) is composed of a column (21), a yarn drum (22), a yarn guide plate (23), and a slot (24); the column (21) has a plurality of slots (24); the slots (24) are composed of two movable blocks (241) and screws (242); the movable blocks (241) are fixed to the column (21) by screws (242); the yarn drum (22) and the yarn guide plate (23) are connected to the column (21) by the slots (24); the reinforcing fibers (1) are wound around the yarn drum (22); the yarn guide plate (23) comprises a yarn guide hole (231) and / or a cloth guide hole (232); the yarn guide hole (231) is composed of one or more circular holes.

8. The method for processing epoxy resin reinforced wood-plastic material according to claim 1, characterized in that: The invention also comprises an online embossing system (11) connected to the co-extrusion die (8), wherein the online embossing system (11) comprises a film roller (111), a plain roller (112) and an embossing roller (113), wherein a film (16) is wound around the film roller (111), and the film (16) is transported to the plain roller (112) and the embossing roller (113), so as to perform film coating and embossing treatment on the wood-plastic profile (14), wherein the surface of the plain roller (112) is smooth, and the surface of the embossing roller (113) is engraved with patterns.

9. The method for processing epoxy resin reinforced wood-plastic material according to claim 1, characterized in that: The invention also comprises a cooling system (12) and a cutting system (13), which are sequentially arranged after the online embossing system (11) and are used for cooling and cutting to obtain epoxy resin reinforced wood-plastic material (15) and products thereof; the pre-curing system (5) is one or more combinations of microwave drying, ultraviolet curing, and infrared drying; and one or more ultrasonic vibrators (17) are installed on the surface of the co-extrusion mold (8).

10. An epoxy resin reinforced wood-plastic material product, characterized in that: The epoxy resin reinforced wood-plastic material product is produced by any one of the methods of claims 1 to 9, and comprises a coating layer (151), a surface layer (152), an elastic layer (153), a base layer (154), and a core layer (155).

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