Corrugated pipe inner wall composite material and preparation method and application thereof

Abstract

The invention relates to the technical field of plastic processing and application, in particular to a corrugated pipe inner wall composite material and a preparation method and application thereof. The corrugated pipe inner wall composite material is prepared from the following raw materials in parts by weight: 45 to 68 parts of regenerated plastic, 25 to 40 parts of ultra-high molecular weight polyethylene, 10 to 30 parts of paraffin, 10 to 18 parts of filler, 10 to 25 parts of silane coupling agent and 0.1 to 3 parts of additive. The ultra-high molecular weight polyethylene and the reprocessed plastic are selected as main materials, and the silane coupling agent, the filler and the paraffin can promote fusion of the ultra-high molecular weight polyethylene and the reprocessed plastic. Not only is the regenerated plastic well utilized, but also the production cost of the inner wall of the corrugated pipe is reduced. The corrugated pipe inner wall composite material provided by the invention has the advantages of better wear resistance, mechanical properties (bending modulus, impact strength, tensile strength, elongation at break and the like) and the like.

Description

Technical Field

[0001] The present application relates to the technical field of plastic processing and application, and in particular to a composite material for the inner wall of a corrugated pipe and a preparation method and application thereof. Background Art

[0002] The inner wall of the corrugated pipe needs to withstand different degrees of impact and cutting of airflow and liquid during use, which easily causes wear of the pipe wall. Therefore, ultra-high molecular weight polyethylene is currently used as the inner wall material to improve the wear resistance of the inner wall. However, the production cost of ultra-high molecular weight polyethylene is relatively high, which is not conducive to the promotion and use of this kind of corrugated pipe.

[0003] The use of recycled plastics can reduce the material of the inner wall of the bellows, but due to the poor basic mechanical properties of recycled plastics, the allowable addition amount is extremely low; and the difference in fluidity between ultra-high molecular weight polyethylene and recycled plastics makes it impossible to fully and evenly mix the two and then use the extrusion processing method for processing. Summary of the invention

[0004] To solve the above problems, the present application proposes a composite material for the inner wall of a corrugated pipe and a preparation method and application thereof. The composite material for the inner wall of a corrugated pipe is a composite material of recycled plastic, ultra-high molecular weight polyethylene and other materials, which has advantages such as good wear resistance.

[0005] This application is implemented through the following technical solutions:

[0006] One of the purposes of the present application is to provide a composite material for the inner wall of a corrugated pipe, comprising the following component raw materials in parts by weight:

[0007] 45 to 68 parts of recycled plastic, 25 to 40 parts of ultra-high molecular weight polyethylene, 10 to 30 parts of paraffin wax, 10 to 18 parts of filler, 10 to 25 parts of silane coupling agent and 0.1 to 3 parts of additives.

[0008] The composite material for the inner wall of the corrugated pipe provided by the present application uses ultra-high molecular weight polyethylene and recycled plastic as the main materials. Silane coupling agent, filler and paraffin can promote the fusion of ultra-high molecular weight polyethylene and recycled plastic, which not only makes good use of recycled plastic, but also reduces the production cost of the inner wall of the corrugated pipe; the additive can improve the stability, mechanical strength and wear resistance of the composite material for the inner wall of the corrugated pipe. The composite material for the inner wall of the corrugated pipe provided by the present application has the advantages of good wear resistance, mechanical properties (flexural modulus, impact strength, tensile strength, elongation at break, etc.).

[0009] In some possible implementations, the melting point of the ultra-high molecular weight polyethylene is 130°C to 136°C.

[0010] In some possible implementations, the melting point of the paraffin wax is 50°C to 70°C.

[0011] In some possible implementations, the particle size of the filler is 0.02 μm to 10 μm.

[0012] In some possible implementations, the composite material for the inner wall of the corrugated pipe further includes 1 to 5 parts by weight of a colorant.

[0013] In some possible implementations, the auxiliary agent includes tert-amyl peroxy-2-ethylhexyl carbonate, and also includes at least one of a defoaming agent and a leveling agent.

[0014] The second object of the present application is to provide a method for preparing the composite material for the inner wall of a corrugated pipe provided in the present application, comprising the following steps:

[0015] The premix, recycled plastic and additives are mixed and melt-extruded to obtain a composite material for the inner wall of the corrugated pipe;

[0016] The premix comprises microcapsules, fillers and silane coupling agents;

[0017] In the microcapsule, the core material is ultra-high molecular weight polyethylene and the wall material is paraffin.

[0018] The preparation method of the composite material for the inner wall of a corrugated pipe provided by the present application, in the premix, the microcapsules and the filler are uniformly dispersed in the silane coupling agent, and when the premix and the recycled plastic are uniformly mixed and melted, the ultra-high molecular weight polyethylene released by the melting of the wall material of the microcapsules can be uniformly dispersed in the molten recycled plastic. The obtained composite material for the inner wall of the corrugated pipe has the advantages of good wear resistance, mechanical properties (flexural modulus, impact strength, tensile strength, elongation at break, etc.), etc.

[0019] In some possible implementations, the preparation of the premix comprises the following steps:

[0020] preparing microcapsules from the ultra-high molecular weight polyethylene and the paraffin;

[0021] The microcapsules and the fillers are dispersed in the silane coupling agent under stirring conditions.

[0022] In some possible implementations, the particle size of the microcapsule is 10 μm to 20 μm.

[0023] The third purpose of the present application is to provide an application of the composite material for inner wall of a corrugated pipe provided in the present application or the composite material for inner wall of a corrugated pipe obtained by the preparation method provided in the present application in the field of corrugated pipe processing technology. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] For the inner wall of the corrugated pipe, the most important thing is its wear resistance. At present, the material of the inner wall is usually ultra-high molecular weight polyethylene. However, due to the high cost of raw materials, complex production process, tight market demand and supply relationship, and increased environmental protection requirements, the production cost of ultra-high molecular weight polyethylene is relatively high, which in turn increases the production cost of the corrugated pipe.

[0029] At present, recycled plastics can be added to reduce the production cost of corrugated pipes, but due to the poor mechanical properties of recycled plastics themselves, the amount of addition cannot be increased. In addition, due to the poor fluidity of ultra-high molecular weight polyethylene and the high impurities in recycled plastics, both cannot be processed by extruders. If other production methods are used, the production cost of corrugated pipes will increase, and may even be higher than when recycled plastics are not used.

[0030] In order to balance reducing the production cost of the bellows and improving its wear resistance, mechanical properties, etc., the embodiment of the present application proposes a composite material for the inner wall of the bellows, its preparation method and application. The composite material for the inner wall of the bellows uses ultra-high molecular weight polyethylene and recycled plastic as the main materials, and silane coupling agent, filler and paraffin are used as additives to promote the fusion of ultra-high molecular weight polyethylene and recycled plastic. Not only does it make good use of the recycled plastic, but it also reduces the production cost of the inner wall of the bellows. The present application provides a composite material for the inner wall of the bellows with good wear resistance, mechanical properties (bending modulus, impact strength, tensile strength, elongation at break, etc.) and other advantages. The preparation method uses ultra-high molecular weight polyethylene as the core material and paraffin as the wall material to make microcapsules, which are then evenly dispersed in the silane coupling agent with the filler, and then mixed with the recycled plastic for melt extrusion, so that the ultra-high molecular weight polyethylene can be evenly dispersed in the molten recycled plastic.

[0031] The following is a detailed description of a composite material for the inner wall of a corrugated pipe and its preparation method and application in an embodiment of the present application.

[0032] [Composite materials for inner wall of corrugated pipe]

[0033] In a first aspect, an embodiment of the present application provides a composite material for the inner wall of a corrugated pipe, comprising the following component raw materials in parts by weight:

[0034] 45 to 68 parts of recycled plastic, 25 to 40 parts of ultra-high molecular weight polyethylene, 10 to 30 parts of paraffin wax, 10 to 18 parts of filler, 10 to 25 parts of silane coupling agent and 0.1 to 3 parts of additives.

[0035] The composite material for the inner wall of the corrugated pipe provided in the embodiment of the present application uses ultra-high molecular weight polyethylene and recycled plastic as the main materials, and the silane coupling agent, filler and paraffin can promote the dispersion and fusion of ultra-high molecular weight polyethylene and recycled plastic, and the additive can improve the stability, mechanical strength and wear resistance of the composite material for the inner wall of the corrugated pipe. Not only can the recycled plastic be well utilized, but also the production cost of the inner wall of the corrugated pipe is reduced. The composite material for the inner wall of the corrugated pipe provided in the present application has the advantages of good wear resistance, mechanical properties (flexural modulus, impact strength, tensile strength, elongation at break, etc.).

[0036] In the embodiment, the weight proportion of recycled plastic is 45 to 68 parts, which can be 45, 50, 60, 68 parts, etc., typical but non-limiting weight proportions or the range between any two weight proportions. The weight proportion of ultra-high molecular weight polyethylene is 25 to 40 parts, which can be 25, 30, 40 parts, etc., typical but non-limiting weight proportions or the range between any two weight proportions. The weight proportion of paraffin is 10 to 30 parts, which can be 10, 20, 30 parts, etc., typical but non-limiting weight proportions or the range between any two weight proportions. The weight proportion of filler is 10 to 18 parts, which can be 10, 15, 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 10 to 25 parts, which can be 10, 15, 20, 25 parts, etc., typical but non-limiting weight proportions or the range between any two weight proportions. The weight proportion of the additive is 0.1 to 3 parts, and can be 0.1, 0.5, 0.8, 1.1, 1.5, 2, 2.5, 3, and other typical but non-limiting weight proportions or the range between any two weight proportions. In this case, the recycled plastic is mixed with ultra-high molecular weight polyethylene, silane coupling agent, paraffin wax, and filler, which can increase the proportion of recycled plastic in the composite material of the inner wall of the corrugated pipe to reduce the production cost of the inner wall of the corrugated pipe; ultra-high molecular weight polyethylene and filler improve the mechanical properties and wear resistance of recycled plastic; paraffin wax promotes the melt mixing of ultra-high molecular weight polyethylene and recycled plastic, that is, improves the dispersibility of ultra-high molecular weight polyethylene, so that the composite material of the inner wall of the corrugated pipe has the advantages of good wear resistance, mechanical properties (flexural modulus, impact strength, tensile strength, elongation at break, etc.); the additive improves the stability, mechanical strength and wear resistance of the composite material of the inner wall of the corrugated pipe.

[0037] 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.

[0038] In some embodiments, the molecular weight of the ultra-high molecular weight polyethylene is greater than 1.5 million, preferably 1.5 million to 9 million. In some embodiments, the melting point of the ultra-high molecular weight polyethylene is 130°C to 136°C, and in the exemplary embodiment, it can be a typical but non-limiting melting point such as 130°C, 132°C, 136°C, or a range between any two melting points. In this case, the ultra-high molecular weight polyethylene has high wear resistance, corrosion resistance, low temperature resistance, impact resistance, and other properties.

[0039] In some embodiments, the melting point of paraffin wax is 50°C to 70°C. In exemplary embodiments, the melting point may be 50°C, 60°C, 70°C, or any other typical but non-limiting melting point or a range between any two melting points. In this case, the temperature of paraffin wax is lower than that of ultra-high molecular weight polyethylene, and it can be used as a wall material to uniformly wrap ultra-high molecular weight polyethylene to form microcapsules. It can also first melt and release ultra-high molecular weight polyethylene during melt extrusion, so that the ultra-high molecular weight polyethylene is evenly dispersed in the recycled plastic.

[0040] In some embodiments, the filler includes talc and / or calcium carbonate. In this case, the filler improves the mechanical properties (flexural modulus, impact strength, tensile strength, elongation at break, etc.) of the composite material of the inner wall of the corrugated pipe.

[0041] In some embodiments, the particle size of the filler is 0.02 μm to 10 μm. In the exemplary embodiment, the particle size may be 0.02 μm, 0.1 μm, 1 μm, 5 μm, 10 μm, etc., which are typical but non-limiting particle sizes, or a range between any two particle sizes. In this case, the filler is easily dispersed in organic materials such as recycled plastics and silane coupling agents, and will not agglomerate.

[0042] In some specific embodiments, the particle size of talc is 1 μm to 10 μm. In exemplary embodiments, the particle size may be 0.1 μm, 1 μm, 3 μm, 8 μm, 10 μm, or other typical but non-limiting particle sizes or a range between any two particle sizes.

[0043] In some specific embodiments, the particle size of calcium carbonate is 0.02 μm to 3 μm. In exemplary embodiments, the particle size may be 0.02 μm, 0.1 μm, 1 μm, 2 μm, 3 μm, or other typical but non-limiting particle sizes or a range between any two particle sizes.

[0044] 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.

[0045] In some embodiments, the composite material for the inner wall of the corrugated pipe further includes 1 to 5 parts by weight of a dye. In this case, the dye can make the composite material for the inner wall of the corrugated pipe present a desired color.

[0046] In some embodiments, the dye is a blue masterbatch, a white masterbatch, a red masterbatch, a yellow masterbatch or a black masterbatch. In this case, the dye can not only make the composite material of the inner wall of the corrugated pipe present the desired color, but also improve the wear resistance, corrosion resistance or heat resistance of the composite material of the inner wall of the corrugated pipe to a certain extent.

[0047] In some embodiments, the auxiliary agent includes tert-amyl peroxide-2-ethylhexyl carbonate, and also includes at least one of a defoamer and a leveling agent. In this case, tert-amyl peroxide-2-ethylhexyl carbonate promotes the cross-linking of silane coupling agent with recycled plastics and ultra-high molecular weight polyethylene to form a stable network structure, thereby improving the stability, mechanical strength and wear resistance of the composite material of the inner wall of the corrugated pipe; the defoamer can reduce and control the foam generated by the melt, significantly improve the surface quality and mechanical properties of recycled plastic products, reduce the defective rate, and ensure the dimensional stability and flatness of the product; the leveling agent can reduce the surface tension of the plastic 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.

[0048]

Method for preparing composite material for inner wall of corrugated pipe

[0049] A second aspect of the embodiment of the present application provides a method for preparing the composite material for the inner wall of a corrugated pipe provided in the embodiment of the present application, comprising the following steps:

[0050] The premix and the recycled plastic are mixed and melt-extruded to obtain a composite material for the inner wall of the corrugated pipe;

[0051] The premix contains microcapsules, fillers and silane coupling agents;

[0052] In the microcapsules, the core material is ultra-high molecular weight polyethylene and the wall material is paraffin.

[0053] In the preparation method of the composite material for the inner wall of a corrugated pipe provided in the embodiment of the present application, in the premix, microcapsules and fillers are uniformly dispersed in the silane coupling agent, and when the premix is ​​uniformly mixed with the recycled plastic and then melted, the ultra-high molecular weight polyethylene released by the melting of the wall material of the microcapsules can be uniformly dispersed in the molten recycled plastic. The obtained composite material for the inner wall of the corrugated pipe has the advantages of good wear resistance, mechanical properties (flexural modulus, impact strength, tensile strength, elongation at break, etc.), etc.

[0054] In some embodiments, the preparation of the premix comprises the following steps:

[0055] Ultra-high molecular weight polyethylene and paraffin wax are made into microcapsules;

[0056] Under stirring conditions, the microcapsules and fillers are dispersed in the silane coupling agent. In this case, stirring can make the microcapsules and fillers uniformly 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 uniformly dispersing the microcapsules and fillers in the silane coupling agent can be achieved.

[0057] In some embodiments, the particle size of the microcapsules is 10 μm to 20 μm. In this case, the microcapsules can be uniformly dispersed in the silane coupling agent and are not easily agglomerated.

[0058] In some embodiments, preparing microcapsules from ultra-high molecular weight polyethylene and paraffin wax comprises the following steps:

[0059] Ultra-high molecular weight polyethylene is made into tiny particles by crushing or solution dispersion;

[0060] Add paraffin additive to the molten paraffin and stir evenly to form molten paraffin;

[0061] The ultra-high molecular weight polyethylene of tiny particles is dispersed in molten paraffin to form a stable emulsion, and then the emulsion is cooled at a cooling rate of 5°C / s to 10°C / s to below the solidification point of the paraffin to obtain a microcapsule wet material; and then the microcapsules are obtained after washing and drying.

[0062] In the above method for preparing microcapsules, the core material and the wall material of the microcapsules are prepared separately, and then mixed into an emulsion and rapidly cooled to solidify the paraffin and wrap the ultra-high molecular weight polyethylene microparticles. The cooling rate of 5°C / s to 10°C / s makes the droplets in the paraffin emulsion gradually solidify into a film, so that the paraffin can evenly and tightly wrap the core material (ultra-high molecular weight polyethylene microparticles). The wet material is washed to remove impurities such as excess additives. The microcapsules prepared by this method have a stable structure.

[0063] In some specific embodiments, the particle size of the ultra-high molecular weight polyethylene microparticles is 100 μm to 200 μm, and in exemplary embodiments, it can be a typical but non-limiting particle size such as 100 μm, 150 μm, 200 μm, or a range between any two particle sizes. In this case, the ultra-high molecular weight polyethylene microparticles are easily evenly dispersed in the molten paraffin and are not easy to agglomerate.

[0064] In some specific embodiments, the paraffin additive includes at least one of an emulsifier, a dispersant, a surfactant, a crosslinking agent, and a stabilizer. In some specific embodiments, the weight portion of the paraffin additive is 0.01 to 0.2 parts. In this case, the additive can promote the uniform dispersion of microparticles of ultra-high molecular weight polyethylene in paraffin and enhance the structural stability and performance of the microcapsules. It should be noted that the materials of the emulsifier, dispersant, surfactant, crosslinking agent, and stabilizer are conventional choices in the art and do not need to be specifically limited in the embodiments of the present application.

[0065] In some specific embodiments, the dispersion method of the ultra-high molecular weight polyethylene particles in the molten paraffin is mechanical stirring or ultrasonic dispersion. It should be noted that the stirring speed of the mechanical stirring can be determined according to the amount of microcapsules actually prepared, and it only needs to be stirred evenly, without special restrictions; similarly, the frequency of ultrasonic dispersion is also determined according to the amount of microcapsules actually prepared; but whether it is mechanical stirring or ultrasonic dispersion, the temperature during dispersion is above the melting point of paraffin and below the melting point of ultra-high molecular weight polyethylene.

[0066] In some specific embodiments, at least one of cyclohexane, chloroform, methanol, and ethanol is used to wash the wet microcapsule material. In this case, these detergents can remove impurities such as additives. It should be noted that the number of washings is selected according to the actual preparation situation and is not particularly limited, but as an example, it can be washed at least twice.

[0067] In some specific embodiments, the drying temperature of the wet microcapsule material is below 40°C. In this case, the drying temperature is set below the melting point of paraffin to prevent the paraffin from melting and destroying the structure of the microcapsules. The drying time is selected according to the actual preparation situation and is not particularly limited, but as an example, 1h to 6h can be selected.

[0068] In some specific embodiments, the wet microcapsule material is dried in an oven, a microwave, a vacuum drying oven, or the like.

[0069] In some embodiments, the particle size of the microcapsules is 300 μm to 500 μm, and in exemplary embodiments, it can be 300 μm, 400 μm, 500 μm, or any other typical but non-limiting particle size or a range between any two particle sizes. In this case, the microcapsules are easily dispersed in the silane coupling agent and are not easy to agglomerate.

[0070] In some embodiments, the particle size of the recycled plastic is 1 mm to 5 mm, and in exemplary embodiments, it can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc., which are typical but non-limiting particle sizes, or a range between any two particle sizes. In this case, the recycled plastic is easily dispersed evenly with the premix.

[0071] In some embodiments, the preparation method further comprises the step of: adding a colorant after mixing the premix and the recycled plastic. In this case, the composite material of the inner wall of the corrugated pipe can present a desired color.

[0072] In other embodiments, the preparation method further comprises the step of: adding 0.1 to 0.5 parts of an additive and a dye after mixing the premix and the recycled plastic. In this case, adding the additive and then melt extruding can improve the uniformity, fluidity and stability of the melt. The dye can make the composite material of the inner wall of the corrugated pipe present the desired color.

[0073] 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 are used, as long as the recycled plastic can be produced, there is no special limitation. As an example, the melting point of waste plastic is the same as that of the new same material, and the melting point of ultra-high molecular weight polyethylene is usually 130°C to 136°C, so the melting temperature can be 150°C to 180°C.

[0074]

application

[0075] A third aspect of the embodiments of the present application provides an application of the composite material for inner wall of a corrugated pipe provided in the embodiments of the present application in the technical field of corrugated pipe production.

[0076] In some embodiments, the composite material for the inner wall of the corrugated pipe provided in the embodiments of the present application is used as a special material for the inner wall of the double-walled corrugated pipe. In this case, the inner wall of the corrugated pipe meets the use requirements and effectively reduces the production cost.

[0077] The following is further described in conjunction with specific embodiments.

[0078] Example 1

[0079] Example 1 provides a composite material for the inner wall of a corrugated pipe, comprising the following component raw materials in parts by weight:

[0080] 50 parts of recycled plastic, 30 parts of ultra-high molecular weight polyethylene, 28 parts of paraffin, 15 parts of calcium carbonate, 20 parts of N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane and 2 parts of tert-amyl peroxide-2-ethylhexyl carbonate; among them, the recycled plastic is waste plastic bottles and the molecular weight of the ultra-high molecular weight polyethylene is 7 million.

[0081] This embodiment also provides a method for preparing the composite material for the inner wall of a corrugated pipe provided in this embodiment, comprising the following steps:

[0082] 1) Preparation of microcapsules:

[0083] ①Ultra-high molecular weight polyethylene is crushed or dispersed in solution to form tiny particles with a particle size range of 100 μm to 200 μm;

[0084] ② Add 0.1 parts of emulsifier to the molten paraffin and stir evenly to form molten paraffin;

[0085] ③ Disperse tiny particles of ultra-high molecular weight polyethylene in molten paraffin to form a stable emulsion, then cool the emulsion at a cooling rate of 8°C / s to below the solidification point of the paraffin to obtain a wet microcapsule material; then wash it with ethanol three times and dry it at 30°C for 3h to obtain microcapsules.

[0086] 2) Under stirring conditions, dispersing microcapsules and calcium carbonate in a silane coupling agent to obtain a premix.

[0087] 3) A single-screw extruder is used to mix the premix, recycled plastic and tert-amyl peroxide-2-ethylhexyl carbonate, and the mixture is melt-extruded at 160° C. to obtain a composite material for the inner wall of a corrugated pipe.

[0088] Example 2

[0089] Example 2 provides a composite material for the inner wall of a corrugated pipe, comprising the following component raw materials in parts by weight:

[0090] 45 parts of recycled plastics, 25 parts of ultra-high molecular weight polyethylene, 10 parts of paraffin, 18 parts of calcium carbonate, 10 parts of N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane and 0.8 parts of tert-amyl peroxide-2-ethylhexyl carbonate; among them, the recycled plastic is waste plastic bottles and the molecular weight of the ultra-high molecular weight polyethylene is 7 million.

[0091] This embodiment also provides a method for preparing the composite material for the inner wall of a corrugated pipe provided in this embodiment, and the steps are basically the same as those in Embodiment 1.

[0092] Example 3

[0093] Example 3 provides a composite material for the inner wall of a corrugated pipe, comprising the following component raw materials in parts by weight:

[0094] 68 parts of recycled plastics, 40 parts of ultra-high molecular weight polyethylene, 30 parts of paraffin, 10 parts of calcium carbonate, 25 parts of N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane and 2.8 parts of tert-amyl peroxide-2-ethylhexyl carbonate; among them, the recycled plastic is waste plastic bottles and the molecular weight of the ultra-high molecular weight polyethylene is 7 million.

[0095] This embodiment also provides a method for preparing the composite material for the inner wall of a corrugated pipe provided in this embodiment, and the steps are basically the same as those in Embodiment 1.

[0096] Example 4

[0097] Example 4 proposes a composite material for the inner wall of a corrugated pipe, and its component raw materials are basically the same as those in Example 1.

[0098] This embodiment also proposes a method for preparing the composite material for the inner wall of a corrugated pipe proposed in this embodiment. The steps are basically the same as those in Example 1, except that: 0.3 parts of a defoamer and a 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.

[0099] Example 5

[0100] Example 5 provides a composite material for the inner wall of a corrugated pipe, comprising the following component raw materials in parts by weight:

[0101] 50 parts of recycled plastic, 30 parts of ultra-high molecular weight polyethylene, 28 parts of paraffin, 15 parts of calcium carbonate, 20 parts of N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, 2 parts of tert-amyl peroxy-2-ethylhexyl carbonate and 3 parts of white masterbatch.

[0102] This embodiment also provides a method for preparing the composite material for the inner wall of a corrugated pipe provided in this embodiment, and the steps are basically the same as those in Embodiment 1, except that:

[0103] In step 2), microcapsules, calcium carbonate and white masterbatch are dispersed in the silane coupling agent under stirring conditions.

[0104] Comparative Example 1

[0105] Comparative Example 1 proposes a recycled plastic, which is the same as the recycled plastic material of Example 1.

[0106] Comparative Example 2

[0107] Comparative Example 2 proposes a composite material for the inner wall of a corrugated pipe, the components and the number of parts of which are substantially the same as those of the composite material for the inner wall of a corrugated pipe in Example 1, except that the components do not contain paraffin.

[0108] This comparative example also proposes a method for preparing the composite material for the inner wall of a corrugated pipe proposed in this comparative example, and the steps are basically the same as those in Example 1, except that:

[0109] Step 1) Ultra-high molecular weight polyethylene is crushed or dispersed in a solution to form tiny particles with a particle size ranging from 100 μm to 200 μm.

[0110] Step 2) Dispersing the prepared microparticles and calcium carbonate in a silane coupling agent under stirring conditions to obtain a premix.

[0111] Comparative Example 3

[0112] Comparative Example 3 proposes a composite material for the inner wall of a corrugated pipe, the components of which are substantially the same as the recycled plastic composite plastic of Example 1, except that the components do not contain a silane coupling agent.

[0113] This comparative example also proposes a method for preparing the composite material for the inner wall of a corrugated pipe proposed in this comparative example, and the steps are basically the same as those in Example 1, except that:

[0114] Step 2) The microcapsules and calcium carbonate are mixed evenly to obtain a premix.

[0115] Step 3) using a single screw extruder to mix the premix and the recycled plastic and then melt extrude them to obtain a composite material for the inner wall of the corrugated pipe.

[0116] Comparative Example 4

[0117] Comparative Example 4 proposes a composite material for the inner wall of a corrugated pipe, the components of which are substantially the same as those of the recycled plastic composite plastic in Example 1.

[0118] This comparative example also proposes a method for preparing the composite material for the inner wall of a corrugated pipe proposed in this comparative example, and the steps are basically the same as those in Example 1, except that:

[0119] Without performing step 1), step 2) is directly performed, that is, ultra-high molecular weight polyethylene, paraffin, calcium carbonate and silane coupling agent are mixed to obtain a premix.

[0120] Step 3) using a single screw extruder to mix the premix and the recycled plastic and then melt extrude them to obtain a composite material for the inner wall of the corrugated pipe.

[0121] In order to verify the advancement of the composite material for the inner wall of a corrugated pipe and the preparation method thereof proposed in the examples of the present application, the composite material for the inner wall of a corrugated pipe provided in the examples and the recycled plastic or composite material for the inner wall of a corrugated pipe provided in the comparative example were tested for wear resistance according to the reference standard GB / T 42122-2022. The test results are shown in Table 1 below.

[0122] Table 1

[0123] Wear rate (%) Example 1 1.91 Example 2 1.89 Example 3 1.74 Example 4 1.93 Example 5 1.92 Comparative Example 1 10.1 Comparative Example 2 4.53 Comparative Example 3 5.77 Comparative Example 4 3.91

[0124] From Table 1 above, we can at least draw the following conclusions:

[0125] ① It can be seen from Examples 1 to 5 and Comparative Examples 1 to 3 that the wear rate of the composite material for the inner wall of the corrugated pipe provided by the embodiments of the present application is less than 2%, and has very high wear resistance.

[0126] ② It can be seen from Example 1 and Comparative Example 4 that the preparation method of the composite material for the inner wall of the corrugated pipe of the embodiment of the present application is to first make ultra-high molecular weight polyethylene and paraffin into microcapsules and then mix them with a silane coupling agent, and finally mix them with recycled plastics and additives for melt extrusion. The ultra-high molecular weight polyethylene and the recycled plastic are evenly mixed, thereby significantly improving the wear resistance of the composite material for the inner wall of the corrugated pipe.

[0127] ③ It can be seen from Example 1 and Comparative Example 3 that the silane coupling agent affects the dispersion and homogenization of calcium carbonate and microcapsules in the recycled plastic, resulting in reduced wear resistance of the composite material of the inner wall of the corrugated pipe.

[0128] 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 composite material for the inner wall of a corrugated pipe, characterized in that: The composition includes the following components in parts by weight: 45 to 68 parts of recycled plastic, 25 to 40 parts of ultra-high molecular weight polyethylene, 10 to 30 parts of paraffin wax, 10 to 18 parts of filler, 10 to 25 parts of silane coupling agent and 0.1 to 3 parts of additives.

2. The composite material for inner wall of a corrugated pipe according to claim 1, characterized in that: The melting point of the ultra-high molecular weight polyethylene is 130°C to 136°C.

3. The composite material for inner wall of a corrugated pipe according to claim 2, characterized in that: The melting point of the paraffin wax is 50°C to 70°C.

4. The composite material for inner wall of a corrugated pipe according to any one of claims 1 to 3, characterized in that: The particle size of the filler is 0.02 μm to 10 μm.

5. The composite material for inner wall of a corrugated pipe according to claim 4, characterized in that: The composite material for the inner wall of the corrugated pipe also includes 1 to 5 parts by weight of a dye.

6. The method for preparing the composite material for the inner wall of a corrugated pipe according to claim 5, characterized in that: The auxiliary agent includes tert-amyl peroxy-2-ethylhexyl carbonate, and also includes at least one of a defoaming agent and a leveling agent.

7. A method for preparing the composite material for the inner wall of a corrugated pipe according to any one of claims 1 to 6, characterized in that: The steps include: The premix, recycled plastic and additives are mixed and melt-extruded to obtain a composite material for the inner wall of the corrugated pipe; The premix comprises microcapsules, fillers and silane coupling agents; In the microcapsule, the core material is ultra-high molecular weight polyethylene and the wall material is paraffin.

8. The method for preparing the composite material for the inner wall of a corrugated pipe according to claim 7, characterized in that: The preparation of the premix comprises the following steps: Ultra-high molecular weight polyethylene and paraffin wax are made into microcapsules; The microcapsules and fillers are dispersed in the silane coupling agent under stirring conditions.

9. The method for preparing the composite material for the inner wall of a corrugated pipe according to claim 8, characterized in that: The particle size of the microcapsule is 10 μm to 20 μm.

10. Use of the composite material for inner wall of a corrugated pipe as claimed in any one of claims 1 to 6 or the composite material for inner wall of a corrugated pipe obtained by the preparation method as claimed in any one of claims 7 to 9 in the field of corrugated pipe processing technology.