Regenerated plastic composite material as well as preparation method and application thereof
By adding calcium carbonate, carbon material powder and silane coupling agent to the recycled plastics, forming a composite material, and mixing and remelting and extruding the premix and recycled plastics, the problem of poor mechanical properties of recycled plastics is solved, and the problem of recycled plastics is achieved. High mechanical properties of recycled plastic composites, suitable for high demanding products and reduce costs.
Patent Information
- Application Number
- CN202411408695.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2024-12-31
AI Technical Summary
The mechanical properties of existing recycled plastics are poor and difficult to use widely. The addition of new materials increases manufacturing costs and has lower performance than that of new plastics.
Recycled plastic composite materials are used to improve the mechanical properties of recycled plastic by adding calcium carbonate, carbon material powder and silane coupling agent, and enhance the dispersion of the material by mixing and remelting of premix and recycling plastic. and mechanical properties.
It significantly improves the bending modulus, impact strength, tensile strength and elongation of break of recycled plastics, and can be widely used in products with high mechanical performance requirements, such as the outer wall of corrugated pipes, reducing production costs.
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Abstract
Description
Technical Field
[0001] The present application relates to the technical field of plastic processing and application, and in particular to a recycled plastic composite material and a preparation method and application thereof. Background Art
[0002] Plastics are made from natural resources such as petroleum, natural gas, and coal. With the rapid development of the plastics industry, the demand for processing, production, or use has increased, and the amount of waste plastics generated has also increased day by day. Most of the waste plastics cannot be naturally degraded. These waste plastics that cannot be naturally degraded are generally landfilled or incinerated. Such treatment not only causes serious environmental pollution, but also causes great waste of the raw materials used to make plastics and waste plastics. Therefore, the use of recycled plastics has become an important way to protect the environment.
[0003] At present, the cheapest way to recycle waste plastics is direct recycling, which is to directly process waste plastics into recycled plastics after simple treatments such as cleaning, crushing, and plasticization. However, the basic mechanical properties of recycled plastics directly recycled from waste plastics are poor and difficult to be widely used. Summary of the invention
[0004] In order to solve the above problems, the present application proposes a recycled plastic composite material and its preparation method and application. The recycled plastic composite material is made of waste plastic as the main material and a small amount of material that increases the mechanical properties of plastic is added, and has good mechanical properties (flexural modulus, impact strength, tensile strength, elongation at break, etc.).
[0005] This application is implemented through the following technical solutions:
[0006] One of the purposes of the present application is to provide a recycled plastic composite material, comprising the following component raw materials in parts by weight:
[0007] 50 to 80 parts of recycled plastic, 10 to 18 parts of calcium carbonate, 1 to 2 parts of silane coupling agent, 0.5 to 1 part of carbon material powder and 0.03 to 0.8 parts of auxiliary agent.
[0008] The recycled plastic composite material provided by the present application, calcium carbonate and carbon material can enhance the mechanical properties of the recycled plastic, and the silane coupling agent can promote the dispersion and homogenization of calcium carbonate and carbon material in the recycled plastic. The recycled plastic composite material has good mechanical properties (flexural modulus, impact strength, tensile strength, elongation at break, etc.), and can be widely used in products such as the outer wall of a corrugated pipe.
[0009] In some possible implementations, the average particle size of the calcium carbonate is 0.02 μm to 3 μm.
[0010] In some possible implementations, the average particle size of the carbon material powder is 5 μm to 20 μm.
[0011] In some possible implementations, the carbon material includes at least one of carbon fiber, graphene, and carbon nanotubes.
[0012] In some possible implementations, the auxiliary agent includes tert-butyl peroxy 2-ethylhexyl carbonate and at least one of a defoaming agent and a leveling agent.
[0013] In some possible implementations, the recycled plastic composite material further includes 0.5 to 1 part by weight of metal powder and 0.1 to 0.5 part by weight of polyethylene.
[0014] In some possible implementations, the metal powder material includes a single metal and / or a metal alloy.
[0015] In some possible implementations, the particle size of the metal powder is 20 μm to 29.5 μm.
[0016] In some possible implementations, the molecular weight of the polyethylene is 1,000 to 10,000.
[0017] The second object of the present application is to provide a method for preparing a recycled plastic composite material, comprising the following steps:
[0018] The premix, recycled plastic and additives are mixed and then melt-extruded to obtain a recycled plastic composite material;
[0019] The premix comprises calcium carbonate, carbon material powder and a silane coupling agent.
[0020] The preparation method of the recycled plastic composite material provided by the present application comprises mixing a premix containing calcium carbonate, carbon material powder and silane coupling agent with recycled plastic and then melt-extruded, which can improve the dispersibility of the calcium carbonate and the carbon material powder in the recycled plastic. The obtained recycled plastic composite material has good mechanical properties (flexural modulus, impact strength, tensile strength, elongation at break, etc.), and can be widely used in products such as the outer wall of a corrugated pipe.
[0021] In some possible implementations, the premix further comprises metal microcapsules; the wall material of the metal microcapsules is polyethylene, and the core material is metal powder.
[0022] The third purpose of the present application is to provide an application of the recycled plastic composite material provided by the present application or the recycled plastic composite material prepared by the preparation method provided by the present application in the field of plastic recycling technology. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.
[0024] Obviously, the following descriptions are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in the field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.
[0025] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the following description is provided for those skilled in the art to fully understand the present application and is not intended to limit the subject matter described in the claims.
[0026] If not otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution, and all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.
[0027] The reason that affects the recycling and widespread use of waste plastics is that the mechanical properties of recycled plastics are poor and can only be used in products with low mechanical property requirements, such as garbage bags. The current way to improve the mechanical properties of recycled plastics is to mix recycled plastics with new plastic raw materials. Although this method can significantly improve the mechanical properties of recycled plastics, the content of recycled plastics is limited and cannot meet current environmental protection needs. In addition, adding new raw materials not only increases the manufacturing cost, but also the mechanical properties of the manufactured products are lower than those of new plastics, which is not worth the loss.
[0028] In order to reduce the recycling cost of recycled plastics and improve their mechanical properties, the present application embodiment proposes a recycled plastic composite material and its preparation method and application. The recycled plastic composite material is a material that increases the mechanical properties of plastics by compounding recycled plastics. It has good mechanical properties (flexural modulus, impact strength, tensile strength, elongation at break, etc.) and can be widely used.
[0029] The following is a detailed description of a recycled plastic composite material and its preparation method and application in an embodiment of the present application.
[0030]
Recycled plastic composite materials
[0031] In a first aspect, an embodiment of the present application provides a recycled plastic composite material, comprising the following component raw materials in parts by weight:
[0032] 50 to 80 parts of recycled plastic, 10 to 18 parts of calcium carbonate, 1 to 2 parts of silane coupling agent, 0.5 to 1 part of carbon material powder and 0.03 to 0.8 parts of auxiliary agent.
[0033] The recycled plastic composite material provided in the embodiments of the present application has good mechanical properties (flexural modulus, impact strength, tensile strength, elongation at break, etc.), and can be widely used in products such as the outer wall of a corrugated pipe.
[0034] In the embodiment, the weight proportion of recycled plastic is 50 to 80 parts, which can be 50, 60, 70, 80 parts, etc., typical but non-limiting weight proportions or the range between any two weight proportions. The weight proportion of calcium carbonate is 10 to 18 parts, which can be 10, 13, 16, 18 parts, etc., typical but non-limiting weight proportions or the range between any two weight proportions. The weight proportion of silane coupling agent is 1 to 2 parts, which can be 1, 1.5, 2 parts, etc., typical but non-limiting weight proportions or the range between any two weight proportions. The weight proportion of carbon material powder is 0.5 to 1 part, which can be 0.5, 0.8, 1 part, etc., typical but non-limiting weight proportions or the range between any two weight proportions. The weight percentage of the additive is 0.03 to 0.8 parts, and can be 0.03, 0.2, 0.6, 0.8, or any other typical but non-limiting weight percentages or a range between any two weight percentages. In this case, the calcium carbonate and carbon material powders can enhance the mechanical properties of the recycled plastic, the silane coupling agent can promote the dispersion and homogenization of the calcium carbonate and carbon material in the recycled plastic, and the additive can improve the mechanical strength and wear resistance of the composite material of the inner wall of the corrugated pipe.
[0035] In some embodiments, the recycled plastic is obtained by melt extrusion granulation after sorting, crushing and cleaning of waste plastic. The recycling of the waste plastic is a recycling method known in the art and is not particularly limited in this application. The source of the waste plastic is also selected according to the actual production process and is not particularly limited, but as an example, the source of the waste plastic can be waste plastic bottles, waste pipes, waste plastic packaging bags, etc.
[0036] In some embodiments, the average particle size of calcium carbonate is 0.02 μm to 3 μm, and in exemplary embodiments, it can be 0.02 μm, 0.1 μm, 1 μm, 2 μm, 3 μm, etc., which are typical but non-limiting average particle sizes, or a range between any two average particle sizes. In this case, calcium carbonate with a smaller average particle size is evenly dispersed in the recycled plastic, thereby enhancing the mechanical properties of the recycled plastic.
[0037] In some embodiments, the average particle size of the carbon material powder is 5 μm to 20 μm. In the exemplary embodiment, the average particle size may be 5 μm, 10 μm, 15 μm, 20 μm, or any range between two average particle sizes. In this case, the carbon material powder within the average particle size range is evenly dispersed in the recycled plastic, thereby improving the mechanical properties of the recycled plastic.
[0038] In some embodiments, the carbon material powder includes at least one of carbon fiber, graphene, and carbon nanotubes. In this case, the carbon fiber, graphene, and carbon nanotubes can cooperate with calcium carbonate to enhance the mechanical properties of the recycled plastic.
[0039] In some embodiments, the silane coupling agent includes at least one of vinyltriethoxysilane, vinyltrimethoxysilane, γ-(methacryloyloxy)propyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, and anilinemethyltriethoxysilane.
[0040] In some embodiments, the auxiliary agent includes tert-butyl peroxide 2-ethylhexyl carbonate, and also includes at least one of a defoamer and a leveling agent. In this case, tert-butyl peroxide 2-ethylhexyl carbonate promotes the cross-linking of the silane coupling agent and the recycled plastic to form a stable network structure, thereby improving the mechanical strength and wear resistance of the recycled plastic composite material; the defoamer can reduce and control the foam generated by the melt, significantly improve the surface quality and mechanical properties of the recycled plastic composite material, reduce the defective product rate, and ensure the dimensional stability and flatness of the product; the leveling agent can reduce the surface tension of the melt, making it easier to form a flat and smooth surface during extrusion, injection molding or pressing. The specific materials and mass ratios of the defoamer and the leveling agent are selected according to the actual production situation. As long as the effects of the defoamer and the leveling agent can be achieved, the embodiments of this application do not make special requirements for this.
[0041] In some embodiments, the recycled plastic composite material also includes 0.5 to 1 parts by weight of metal powder and 0.1 to 0.5 parts of polyethylene. In the exemplary embodiment, the weight of the metal powder can be 0.5, 0.8, 1, etc. typical but non-limiting weight parts or a range between any two weight parts; the weight of the polyethylene can be 0.1, 0.2, 0.3, 0.4, 0.5, etc. typical but non-limiting weight parts or a range between any two weight parts. In this case, a small amount of metal powder can not only improve the mechanical properties of the recycled plastic, but also has little effect on the electrical conductivity of the plastic; polyethylene can improve the mechanical strength of the recycled plastic. In addition, when preparing the recycled plastic composite material, polyethylene and metal powder are made into metal microcapsules, which can promote the uniform dispersion of the metal powder.
[0042] In some embodiments, the metal powder material includes a metal element and / or a metal alloy. In this case, the metal and / or metal alloy can cooperate with the calcium carbonate and carbon material powder to improve the mechanical properties of the recycled plastic.
[0043] In some embodiments, the metal element includes at least one of iron, nickel, copper, aluminum, tin, and zinc.
[0044] In some embodiments, the metal alloy includes an alloy of two or more metals selected from the group consisting of iron, nickel, copper, aluminum, tin, and zinc.
[0045] In some embodiments, the particle size of the metal powder is 20 μm to 29.5 μm. In an exemplary embodiment, the particle size may be 20 μm, 27 μm, 29.5 μm, or any range between two particle sizes. In this case, the metal powder within the particle size range is uniformly dispersed in the recycled plastic, thereby enhancing the mechanical properties of the recycled plastic.
[0046] In some embodiments, the molecular weight of polyethylene is 1000-10000, and in exemplary embodiments, it can be 1000, 5000, 10000, or any other typical but non-limiting molecular weight or a range between any two molecular weights. In this case, polyethylene has a relatively low melting point (approximately 110° C.-125° C.), and can well coat metal powder to form metal microcapsules.
[0047]
Preparation method of recycled plastic composite material
[0048] A second aspect of the present application provides a method for preparing a recycled plastic composite material, comprising the following steps:
[0049] S1. The premix, the recycled plastic and the additive are mixed and melt-extruded to obtain a recycled plastic composite material;
[0050] The premix contains calcium carbonate, carbon material powder and a silane coupling agent.
[0051] The preparation method of the recycled plastic composite material provided in the embodiment of the present application can improve the dispersibility of calcium carbonate and carbon material powder in the recycled plastic by mixing the premix containing calcium carbonate, carbon material powder and silane coupling agent with the recycled plastic and then melt-extrude. The obtained recycled plastic composite material has good mechanical properties (flexural modulus, impact strength, tensile strength, elongation at break, etc.) and can be widely used.
[0052] In some embodiments, the preparation of the premix includes: dispersing calcium carbonate and carbon material powders in a silane coupling agent under stirring conditions. In this case, stirring can make the calcium carbonate and carbon material powders evenly dispersed in the silane coupling agent. The stirring speed and stirring method can be adjusted according to the actual preparation process, as long as the purpose of evenly dispersing the calcium carbonate and carbon material powders can be achieved.
[0053] In some embodiments, the premix further comprises metal microcapsules. In some embodiments, the wall material of the metal microcapsules is polyethylene, and the core material is metal powder. In this case, when the metal microcapsules are melted after the premix and the recycled plastic are mixed, the wall material melts and releases the metal powder, which is evenly dispersed in the recycled plastic, thereby improving the mechanical properties of the recycled plastic.
[0054] In some specific embodiments, the method for preparing metal microcapsules comprises the following steps:
[0055] The metal powder is dispersed in molten polyethylene to form a stable emulsion, and then the emulsion is cooled at a cooling rate of 3°C / s to 8°C / s to below the solidification point of polyethylene to obtain a wet metal microcapsule material; the metal microcapsules are then obtained after washing and drying.
[0056] In the preparation method of the metal microcapsules, the metal powder is evenly dispersed in molten polyethylene and then cooled and solidified into a film, so that the polyethylene evenly wraps the metal powder, and the wet material is washed to remove excess impurities such as unwrapped polyethylene and metal powder.
[0057] In some embodiments, the particle size of the metal microcapsule is 20.5 μm to 37.5 μm. In the exemplary embodiment, it can be a typical but non-limiting particle size such as 20.5 μm, 25.1 μm, 30 μm, 37.5 μm, or a range between any two particle sizes. In some embodiments, the thickness of the metal microcapsule wall material is 0.5 μm to 8 μm. In the exemplary embodiment, it can be a typical but non-limiting thickness such as 0.5 μm, 1 μm, 3 μm, 6 μm, 8 μm, or a range between any two thicknesses. In this case, the wall material of the metal microcapsule is not easily destroyed when it is prepared into a premix, and when it is melted, the wall material melts to release the metal powder and is evenly dispersed in the recycled plastic, thereby improving the mechanical properties of the recycled plastic.
[0058] In some embodiments, when the premix contains metal microcapsules, the preparation of the premix includes: dispersing calcium carbonate, carbon material powder and metal microcapsules in a silane coupling agent.
[0059] In some embodiments, a single screw extruder is used to mix the premix and the recycled plastic and then melt extrudes. It should be noted that the temperature of the melt extrusion is actually set according to the existing actual production process, and may not be limited to the use of a single screw extruder for melt extrusion; no matter what method and temperature is used, as long as the recycled plastic can be produced, there is no limitation. As an example, the melting point of waste plastic is the same as that of the new same material, so the melting temperature can be 70°C to 150°C.
[0060]
application
[0061] A third aspect of the embodiments of the present application provides an application of the recycled plastic composite material provided by the embodiments of the present application or the recycled plastic composite material prepared by the preparation method provided by the embodiments of the present application in the field of plastic recycling technology.
[0062] In some embodiments, the recycled plastic composite material provided in the embodiments of the present application or the recycled plastic composite material obtained by the preparation method provided in the embodiments of the present application is used as a special material for the outer wall of the corrugated pipe. In this case, the outer wall of the corrugated pipe meets the use requirements and effectively reduces the production cost.
[0063] The following is further described in conjunction with specific embodiments.
[0064] Example 1
[0065] Example 1 provides a recycled plastic composite material, comprising the following component raw materials in parts by weight:
[0066] 70 parts of recycled plastic, 15 parts of calcium carbonate, 1.3 parts of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 0.7 parts of carbon fiber powder and 0.08 parts of tert-butyl peroxy 2-ethylhexyl carbonate;
[0067] Among them, recycled plastics are waste plastic bottles.
[0068] This embodiment also provides a method for preparing the recycled plastic composite material provided in this embodiment, comprising the following steps:
[0069] 1) Preparing a premix: Dispersing calcium carbonate and carbon material powders in a silane coupling agent under stirring conditions.
[0070] 2) A single screw extruder is used to mix the premix and the recycled plastic and then melt-extrude them to obtain a recycled plastic composite material.
[0071] Example 2
[0072] Example 2 provides a recycled plastic composite material, comprising the following component raw materials in parts by weight:
[0073] 50 parts of recycled plastic, 10 parts of calcium carbonate, 1 part of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 0.5 parts of carbon fiber powder and 0.05 parts of tert-butyl peroxy 2-ethylhexyl carbonate;
[0074] Among them, recycled plastics are waste plastic bottles.
[0075] This embodiment also provides a method for preparing the recycled plastic composite material provided in this embodiment, and the steps are basically the same as those in Embodiment 1.
[0076] Example 3
[0077] Example 3 provides a recycled plastic composite material, comprising the following component raw materials in parts by weight:
[0078] 80 parts of recycled plastic, 18 parts of calcium carbonate, 2 parts of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 1 part of carbon fiber powder and 0.8 parts of tert-butyl peroxy 2-ethylhexyl carbonate.
[0079] This embodiment also provides a method for preparing the recycled plastic composite material provided in this embodiment, and the steps are basically the same as those in Embodiment 1.
[0080] Example 4
[0081] Example 4 proposes a recycled plastic composite material, the component raw materials of which are basically the same as those of Example 1.
[0082] This embodiment also proposes a method for preparing the recycled plastic composite material proposed in this embodiment, and the steps are basically the same as those in Example 1, except that: 0.3 parts of defoamer and leveling agent are added after the premix and the recycled plastic are mixed, and the mass fraction ratio of the defoamer and the leveling agent is 1:1.
[0083] Example 5
[0084] Example 5 provides a recycled plastic composite material, comprising the following component raw materials in parts by weight:
[0085] 70 parts of recycled plastics, 15 parts of calcium carbonate, 1.3 parts of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 0.7 parts of carbon fiber powder, 0.08 parts of tert-butyl peroxy 2-ethylhexyl carbonate, 0.5 parts of iron powder and 0.1 parts of polyethylene; among which, the relative molecular weight of polyethylene is 5000, and the recycled plastic is waste plastic bottles.
[0086] This embodiment also provides a method for preparing the recycled plastic composite material provided in this embodiment, and the steps are basically the same as those in Example 1, except that:
[0087] The preparation of the premix in step 1) is to first prepare metal microcapsules from iron powder and polyethylene, and then disperse calcium carbonate, carbon material powder and metal microcapsules in a silane coupling agent.
[0088] Example 6
[0089] Example 6 provides a recycled plastic composite material, comprising the following component raw materials in parts by weight:
[0090] 70 parts of recycled plastics, 15 parts of calcium carbonate, 1.3 parts of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 0.7 parts of carbon fiber powder, 0.08 parts of tert-butyl peroxy 2-ethylhexyl carbonate, 1 part of iron powder and 0.5 parts of polyethylene; among which, the relative molecular weight of polyethylene is 5000, and the recycled plastic is waste plastic bottles.
[0091] This embodiment also provides a method for preparing the recycled plastic composite material provided in this embodiment, and the steps are basically the same as those in Embodiment 5.
[0092] Example 7
[0093] Example 7 provides a recycled plastic composite material, comprising the following component raw materials in parts by weight:
[0094] 70 parts of recycled plastics, 15 parts of calcium carbonate, 1.3 parts of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 0.7 parts of carbon fiber powder, 0.08 parts of tert-butyl peroxy 2-ethylhexyl carbonate, 0.5 parts of iron powder and 0.1 parts of polyethylene; among which, the relative molecular weight of polyethylene is 5000, and the recycled plastic is waste plastic bottles.
[0095] This embodiment also proposes a method for preparing the recycled plastic composite material proposed in this embodiment, and the steps are basically the same as those in Example 5, except that: 0.3 parts of defoamer and leveling agent are added after the premix and the recycled plastic are mixed, and the mass fraction ratio of the defoamer and the leveling agent is 1:1.
[0096] Comparative Example 1
[0097] Comparative Example 1 proposes a recycled plastic, which is the same as the recycled plastic material of Example 1.
[0098] Comparative Example 2
[0099] Comparative Example 2 proposes a recycled plastic composite material, the components of which are substantially the same as those of the recycled plastic composite plastic of Example 1, except that the components do not contain calcium carbonate.
[0100] Comparative Example 3
[0101] Comparative Example 3 proposes a recycled plastic composite material, the components of which are substantially the same as those of the recycled plastic composite plastic of Example 1, except that the components do not contain carbon fiber powder.
[0102] Comparative Example 4
[0103] Comparative Example 4 proposes a recycled plastic composite material, the components of which are substantially the same as those of the recycled plastic composite plastic of Example 1, except that the components do not contain calcium carbonate and carbon fiber powder.
[0104] Comparative Example 5
[0105] Comparative Example 5 proposes a recycled plastic composite material, the components of which are substantially the same as those of the recycled plastic composite plastic of Example 1, except that no silane coupling agent is added to the components.
[0106] In order to verify the progressiveness of the recycled plastic composite material and the preparation method thereof proposed in the examples of the present application, mechanical property tests were conducted on the recycled plastic composite material provided in the examples and the recycled plastic provided in the comparative examples. Among them, the test standards for flexural modulus refer to GB / T9341-2008, the test standards for notched impact strength refer to GB / T1843, the test standards for tensile strength refer to GB / T1040-2006, and the test standards for elongation at break refer to GB / T1040-2006; the test results are shown in Table 1 below.
[0107] Table 1
[0108]
[0109] From Table 1 above, we can at least draw the following conclusions:
[0110] ① It can be seen from the embodiments and comparative examples that the addition of calcium carbonate and carbon fiber powder to recycled plastics can significantly improve the mechanical properties of recycled plastics; although the added metal powder has some effect on the tensile strength and elongation at break of the composite material, the notched impact strength of the material is still improved.
[0111] ② It can be seen from Example 1 and Comparative Examples 1 to 5 that calcium carbonate, carbon fiber powder and silane coupling agent in the recycled plastic composite material of the present application are indispensable. In addition, the silane coupling agent affects the dispersion and homogenization of calcium carbonate and carbon materials in the recycled plastic, and the uniform dispersion and homogenization have a greater impact on the mechanical properties of the composite material.
[0112] ③ When preparing the recycled plastic composite material of the embodiment of the present application, a defoaming agent and a leveling agent are added, which can improve the melt index of the composite material, thereby improving the fluidity of the molten material and promoting the extrusion molding of the material.
[0113] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.
Claims
1. A recycled plastic composite material, characterized in that: The composition includes the following components in parts by weight: 50 to 80 parts of recycled plastic, 10 to 18 parts of calcium carbonate, 1 to 2 parts of silane coupling agent, 0.5 to 1 part of carbon material powder and 0.03 to 0.8 parts of auxiliary agent.
2. The recycled plastic composite material according to claim 1, characterized in that: The average particle size of the calcium carbonate is 0.02 μm to 3 μm.
3. The recycled plastic composite material according to claim 1, characterized in that: The average particle size of the carbon material powder is 5 μm to 20 μm; And / or, the carbon material includes at least one of carbon fiber, graphene, and carbon nanotube.
4. The recycled plastic composite material according to any one of claims 1 to 3, characterized in that: The auxiliary agent includes tert-butyl peroxy 2-ethylhexyl carbonate and at least one of a defoamer and a leveling agent.
5. The recycled plastic composite material according to claim 4, characterized in that: The recycled plastic composite material also includes 0.5 to 1 part by weight of metal powder and 0.1 to 0.5 part by weight of polyethylene.
6. The recycled plastic composite material according to claim 5, characterized in that: The metal powder material includes a single metal and / or a metal alloy.
7. The recycled plastic composite material according to claim 6, characterized in that: The particle size of the metal powder is 20 μm to 29.5 μm; And / or, the molecular weight of the polyethylene is 1,000 to 10,000.
8. A method for preparing a recycled plastic composite material, characterized in that: The steps include: The premix, recycled plastic and additives are mixed and then melt-extruded to obtain a recycled plastic composite material; The premix comprises calcium carbonate, carbon material powder and a silane coupling agent.
9. The method for preparing a recycled plastic composite material according to claim 8, characterized in that: The premix further comprises metal microcapsules; the wall material of the metal microcapsules is polyethylene, and the core material is metal powder.
10. Use of the recycled plastic composite material as claimed in any one of claims 1 to 7 or the recycled plastic composite material prepared by the preparation method as claimed in any one of claims 8 to 9 in the field of plastic recycling technology.