High-performance composite material for conical breaker plate and preparation method thereof

Abstract

The application belongs to the technical field of composite materials, and particularly relates to a high-performance composite material for a conical breaking lining plate and a preparation method thereof. The composite material comprises the following components in parts by weight: 70-90 parts of semi-aromatic polyamide, 20-30 parts of fiber reinforced filler, 10-20 parts of toughening agent, 10-20 parts of brominated polystyrene, 10-15 parts of graphene, 1-5 parts of diatomite nanoparticles, 2-6 parts of metal compound flame retardant additive, 0.5-3 parts of coupling agent, 0.5-3 parts of lubricant, and 0.5-3 parts of antioxidant. In the brominated polystyrene flame-retardant resin, graphene and diatomite nanoparticles are added, which can not only improve the dispersibility of the brominated polystyrene and the compatibility with the polyamide resin, improve the flame retardancy and thermal stability of the composite material, but also improve the mechanical properties of the composite material, and meet the use requirements of devices in the conical breaking lining plate and other equipment.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology, specifically relating to a high-performance composite material for cone crusher liners and its preparation method. Background Technology

[0002] Cone crushers, commonly used in the construction industry, work by using the gyratory motion of the moving cone to subject materials to immense compressive force, resulting in crushing. The moving and fixed cone liners, as structures in direct contact with the material, endure the compressive force and friction generated by relative sliding over extended periods, operating in a harsh environment. Due to the continuous vibration during operation, the components require high mechanical properties to maintain stability. While metal-based components offer good stability, they are expensive and difficult to process. Polymer materials, being easily processed, have gained widespread attention in the machinery industry.

[0003] Polyamide, commonly known as nylon, is a general term for a class of polymers containing a large number of amide bonds in their molecular chains. It is a semi-crystalline plastic, with a higher density in the crystalline phase than in the amorphous phase. Its density is closely related to its crystallinity; when the methylene content in the main chain increases or the amide bond content decreases, the crystallinity and density of nylon decrease. Therefore, except for a very small number of random copolymers of transparent nylon, most nylons are opaque, hard, milky-white granules. As the most widely used of the five major engineering plastics, nylon's polar amide bonds in its molecular chains can form hydrogen bonds between molecules, making the molecular chains more regularly arranged. Therefore, it has excellent mechanical properties, and other properties such as heat resistance, chemical corrosion resistance, self-lubrication, barrier properties, and electrical insulation are also superior to similar materials. This makes nylon and its modified products widely used in the automotive, medical, aerospace, machinery, electrical, and packaging fields. The synthesis methods of nylon are mainly divided into two types: one is through the dehydration condensation reaction of diamines and diacids; the other is through the ring-opening reaction of lactams or the condensation polymerization of amino acids. Based on the differences in repeating units, polyamides are mainly divided into three categories: aliphatic polyamides, semi-aromatic polyamides, and fully aromatic polyamides.

[0004] Aliphatic polyamides have a linear molecular chain composed of alternating amide and methylene groups. The length of the methylene segment affects the material's flexibility; when the number of methylene groups exceeds five, low-temperature impact resistance is significantly enhanced. Hydrogen bonding between amide groups forms a three-dimensional network structure, imparting high strength and adjustable moisture absorption properties. Fully aromatic polyamides refer to polyamides in which all monomers contain benzene rings, primarily represented by poly(m-phenylene isophthalamide) and poly(p-phenylene terephthalamide). These polyamides have a high benzene ring content in their molecular chains, resulting in high temperature resistance, high mechanical strength, and high modulus. Their low amide bond content leads to lower water absorption and better dimensional stability of the manufactured parts. However, due to the high benzene ring content, their melting temperature is higher than their decomposition temperature, making melt processing difficult and increasing production costs. These materials are often spun using solution processing, producing fibers with excellent heat resistance, high strength, and impact resistance, commonly used to manufacture high-end products such as protective clothing and bulletproof equipment. Semi-aromatic polyamides refer to polyamides in which only one monomer (diamine or diacid) contains a benzene ring. They are polyamide polymers with a partially aromatic ring structure prepared by polycondensation of aliphatic diamines or diacids with diacids or diamines containing a benzene ring. Due to their good heat resistance, mechanical properties, molding and processing performance, and low water absorption, semi-aromatic polyamides are widely used in automotive engine peripheral parts, electronic connectors, LED brackets, mechanical bearing cages, weaponry, aerospace, and other fields. However, the poor flame retardancy of polyamides limits their application. Brominated polystyrene is an excellent environmentally friendly flame retardant. However, when applied to polyamides, its flame retardancy improvement is limited due to compatibility issues, and it can easily lead to a decrease in the mechanical properties of polyamide composites. Summary of the Invention

[0005] To address the technical problems existing in the prior art, this invention provides a high-performance composite material for cone crusher liners and its preparation method. While maintaining the mechanical properties of the composite material, its flame retardant effect is further improved, and it has wide applications in the field of mechanical equipment such as cone crusher liners.

[0006] This invention is achieved through the following technical solution:

[0007] A high-performance composite material for cone crusher liners comprises the following components in parts by weight:

[0008] The ingredients are: 70-90 parts semi-aromatic polyamide, 20-30 parts fiber-reinforced filler, 10-20 parts toughening agent, 10-20 parts brominated polystyrene, 10-15 parts graphene, 1-5 parts diatomaceous earth nanoparticles, 2-6 parts metal compound flame retardant additive, 0.5-3 parts coupling agent, 0.5-3 parts lubricant, and 0.5-3 parts antioxidant.

[0009] The benzene rings in the macromolecular structure of semi-aromatic polyamides endow them with superior mechanical properties, heat resistance, and low water absorption compared to aliphatic polyamides. Meanwhile, the aliphatic segments provide processing fluidity lacking in fully aromatic polyamides. By inheriting the advantages of both aliphatic and aromatic polyamides while overcoming their shortcomings, semi-aromatic polyamides exhibit excellent overall performance. Therefore, choosing semi-aromatic polyamides as the matrix resin can satisfy the dual requirements of material strength and toughness.

[0010] Brominated polystyrene is a commonly used environmentally friendly brominated flame retardant in this field. Furthermore, the dosage of brominated polystyrene is 12-17 parts; an appropriate amount of brominated polystyrene can balance flame retardancy and mechanical properties. Commonly used brominated polystyrene has a weight-average molecular weight generally between 5000-250000, and a bromine content generally between 60%-70 wt%. Specifically, this invention can choose to use Albemarle's SAYTEX HP-7010 brominated polystyrene. Brominated polystyrene has high flame retardant efficiency, requires a small dosage, and has good flame retardant effect, which can reduce or even avoid personal injury and property damage caused by fire, and has a high cost-performance ratio. Moreover, brominated polystyrene itself is composed of organic macromolecules, and no dioxins are generated during high-temperature decomposition or combustion, and no harmful gases are produced. The entire process from the production, sale, and use of high-molecular-weight brominated flame retardants is non-toxic and harmless, and its applications are widespread. However, during melt processing, brominated polystyrene and highly polar polyamides are prone to compatibility issues, leading to agglomeration or separation of the brominated polystyrene, which in turn affects the improvement of the composite material's mechanical strength and flame retardant properties. To address these issues, this invention incorporates a certain amount of graphene and diatomaceous earth nanoparticles.

[0011] Graphene is a two-dimensional nanomaterial composed of a single layer of carbon atoms, arranged in a honeycomb structure with periodic carbon six-membered rings, typically with a lateral dimension of 1-10 µm. Graphene's unique two-dimensional layered structure provides excellent physical barrier properties and reduces the heat release rate in brominated polystyrene flame-retardant polyamide resins, thus achieving flame retardancy. The carbon walls formed by stacked graphene create an excellent gas barrier layer, delaying the oxidative degradation of polyamide during ignition. Furthermore, graphene's large specific surface area induces the formation of numerous dense carbon layers, preventing further thermal decomposition of the resin matrix. More importantly, during processing, the layered graphene structure can interact with granular nano-diatomaceous earth to promote the dispersion of brominated polystyrene, improving the mechanical properties and flame retardant effect of the composite material. Diatomaceous earth, mainly composed of silicon dioxide, possesses a unique porous structure, relatively low density, large specific surface area, and high chemical stability. The addition of diatomaceous earth nanoparticles can simultaneously improve component dispersibility and enhance flame retardancy. Diatomaceous earth primarily functions as a flame retardant in the condensed phase by increasing the thermal decomposition temperature, decreasing the thermal decomposition rate, and reducing the heat release rate. The resulting char layer slows down the thermal decomposition of the material and prevents the generated heat from being conducted into the material, thus achieving a flame retardant effect. Furthermore, its granular structure can interact with layered graphene, promoting their dispersion. Simultaneously, the unique porous structure of diatomaceous earth can exert an adsorption effect, effectively improving the compatibility between components and further enhancing the dispersion of brominated polystyrene, thereby improving the mechanical properties and flame retardant effect of the system.

[0012] In summary, adding graphene and diatomaceous earth nanoparticles to brominated polystyrene flame-retardant polyamide resin can improve the dispersibility of brominated polystyrene and its compatibility with polyamide resin, thereby enhancing the flame retardancy and thermal stability of the composite material. Simultaneously, it can also improve the mechanical properties of the composite material, enabling it to meet the usage requirements of cone liner breakers, especially components in cone liner breaker equipment.

[0013] In one embodiment, the semi-aromatic polyamide is one or more of PA6T, PA6I, PA9T, PA9T / 66, PA10T, PA10T / 66, PA10T / 10I, PA10T / 1010, PA12T, and PA12I. Further, semi-aromatic polyamides with long carbon aliphatic chains, such as PA9T, PA9T / 66, PA10T, PA10T / 66, PA10T / 10I, PA10T / 1010, PA12T, and PA12I, can be selected. Long-chain semi-aromatic polyamides combine the strength and toughness of polyamides, better meeting the requirements of components such as sealing rings, gaskets, buffers, and shock absorbers in cone crushers, especially cone crusher plate equipment.

[0014] In one embodiment, the fiber-reinforced filler is glass fiber. The type of glass fiber is not particularly limited; any fiber commonly used in the art is acceptable.

[0015] In one embodiment, the toughening agent is one or more of maleic anhydride-grafted polyethylene, maleic anhydride-grafted polypropylene, maleic anhydride-grafted ethylene propylene diene monomer (EPDM) rubber, maleic anhydride-grafted ethylene-octene copolymer, and maleic anhydride-grafted SEBS.

[0016] In one embodiment, the mass ratio of graphene to diatomaceous earth nanoparticles is (3-6):1. The particle size of the diatomaceous earth nanoparticles is not particularly limited, but their volume average particle size D50 can be 50-1000 nm; further, it can be 100-800 nm, and even further, it can be 200-700 nm or 300-500 nm. A suitable diatomaceous earth particle size can, on the one hand, better promote the dispersion of flame-retardant components and improve the flame-retardant effect of brominated polystyrene; on the other hand, particles of a suitable size can act as separators for sheet-like graphene, promoting graphene dispersion and improving the mechanical properties of the composite material.

[0017] In one embodiment, the metal compound flame retardant is antimony trioxide.

[0018] In one embodiment, the coupling agent is one or more of a silane coupling agent and a titanate coupling agent. The addition of the coupling agent enhances the adhesion between the polyamide matrix and the inorganic filler, thereby improving the mechanical properties and dimensional stability of the composite material.

[0019] In one embodiment, the lubricant is one or more of talc, silicone oil, calcium stearate, zinc stearate, polytetrafluoroethylene, paraffin wax, and polyethylene wax.

[0020] In one embodiment, the antioxidant is one or more of hindered phenolic antioxidants and phosphite antioxidants. The addition of antioxidants can improve the thermal stability of each component in the composite material and prevent aging and decomposition during processing or use.

[0021] On the other hand, the present invention also provides a method for preparing a high-performance conical breaker liner composite material, comprising the following steps:

[0022] (1) Mix semi-aromatic polyamide, toughening agent, brominated polystyrene, graphene, diatomaceous earth nanoparticles, metal compound flame retardant, coupling agent, lubricant and antioxidant evenly to obtain a mixture;

[0023] (2) The mixture is added into the twin-screw extruder from the main feed port, and the fiber-reinforced filler is added into the twin-screw extruder from the side feed port. The mixture is then extruded and granulated to obtain a high-performance conical breaker liner composite material.

[0024] In one embodiment, the twin-screw extruder has a screw speed of 300-600 r / min and an extrusion temperature of 260-330℃.

[0025] Beneficial effects:

[0026] Adding graphene and diatomaceous earth nanoparticles to brominated polystyrene flame-retardant polyamide resin can improve the dispersibility of brominated polystyrene and its compatibility with polyamide resin, enhance the flame retardancy and thermal stability of the composite material, and at the same time improve the mechanical properties of the composite material, enabling it to meet the usage requirements of components in cone crushers, especially cone crusher plates and other equipment. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0028] Unless otherwise specified, the raw material types and preparation processes used in the following examples and comparative examples are the same. The semi-aromatic polyamide is polyamide 10T, the fiber-reinforcing filler is glass fiber, the metal compound flame retardant is antimony trioxide, and the average transverse dimension of the graphene is 3 μm.

[0029] The method for preparing the high-performance conical breaker liner material includes the following steps:

[0030] (1) Mix semi-aromatic polyamide, toughening agent, brominated polystyrene, graphene, diatomaceous earth nanoparticles, metal compound flame retardant, coupling agent, lubricant and antioxidant evenly to obtain a mixture;

[0031] (2) The mixture is added to the twin-screw extruder from the main feed port, and the fiber-reinforced filler is added to the twin-screw extruder from the side feed port. The mixture is extruded and granulated to obtain a high-performance composite material for cone crusher liners. The twin-screw extruder has a screw speed of 500 r / min and an extrusion temperature of 320℃.

[0032] Example 1

[0033] A high-performance composite material for cone crusher liners comprises the following components in parts by weight:

[0034] 70 parts of semi-aromatic polyamide, 20 parts of fiber-reinforced filler, 10 parts of toughening agent maleic anhydride-grafted ethylene-octene copolymer, 10 parts of brominated polystyrene, 10 parts of graphene, 1 part of diatomaceous earth nanoparticles with an average particle size of 100 nm, 2 parts of metal compound flame retardant, 0.5 parts of coupling agent KH-550, 0.5 parts of lubricant calcium stearate, and 0.5 parts of antioxidant 1010.

[0035] Example 2

[0036] A high-performance composite material for cone crusher liners comprises the following components in parts by weight:

[0037] 90 parts of semi-aromatic polyamide, 30 parts of fiber-reinforced filler, 20 parts of toughening agent maleic anhydride-grafted SEBS, 18 parts of brominated polystyrene, 15 parts of graphene, 5 parts of diatomaceous earth nanoparticles with an average particle size of 700 nm, 6 parts of metal compound flame retardant, 3 parts of coupling agent KH-550, 3 parts of lubricant talc, and 3 parts of antioxidant 1010.

[0038] Example 3

[0039] A high-performance composite material for cone crusher liners comprises the following components in parts by weight:

[0040] 80 parts of semi-aromatic polyamide, 25 parts of fiber-reinforced filler, 15 parts of toughening agent maleic anhydride-grafted ethylene-octene copolymer, 20 parts of brominated polystyrene, 12 parts of graphene, 2 parts of diatomaceous earth nanoparticles with an average particle size of 400 nm, 4 parts of metal compound flame retardant additive, 2 parts of coupling agent KH-550, 2 parts of lubricant talc, and 2 parts of antioxidant 1010.

[0041] Example 4

[0042] A high-performance composite material for cone crusher liners comprises the following components in parts by weight:

[0043] 75 parts of semi-aromatic polyamide, 22 parts of fiber-reinforced filler, 13 parts of toughening agent maleic anhydride-grafted SEBS, 13 parts of brominated polystyrene, 12 parts of graphene, 2 parts of diatomaceous earth nanoparticles with an average particle size of 100 nm, 3 parts of metal compound flame retardant, 1 part of coupling agent KH-550, 1 part of lubricant calcium stearate, and 1 part of antioxidant 1010.

[0044] Example 5

[0045] A high-performance composite material for cone crusher liners comprises the following components in parts by weight:

[0046] 80 parts of semi-aromatic polyamide, 25 parts of fiber-reinforced filler, 15 parts of toughening agent maleic anhydride-grafted ethylene-octene copolymer, 15 parts of brominated polystyrene, 12 parts of graphene, 2 parts of diatomaceous earth nanoparticles with an average particle size of 100 nm, 4 parts of metal compound flame retardant additive, 2 parts of coupling agent KH-550, 2 parts of lubricant talc, and 2 parts of antioxidant 1010.

[0047] Example 6

[0048] A high-performance composite material for cone crusher liners comprises the following components in parts by weight:

[0049] The composition includes 85 parts of semi-aromatic polyamide, 27 parts of fiber-reinforced filler, 18 parts of toughening agent maleic anhydride-grafted SEBS, 17 parts of brominated polystyrene, 14 parts of graphene, 4 parts of diatomaceous earth nanoparticles with an average particle size of 700 nm, 5 parts of metal compound flame retardant, 2 parts of coupling agent KH-550, 2 parts of lubricant zinc stearate, and 2 parts of antioxidant 1010.

[0050] Example 7

[0051] A high-performance composite material for cone crusher liners comprises the following components in parts by weight:

[0052] 80 parts of semi-aromatic polyamide, 25 parts of fiber-reinforced filler, 15 parts of toughening agent maleic anhydride-grafted ethylene-octene copolymer, 15 parts of brominated polystyrene, 12 parts of graphene, 2 parts of diatomaceous earth nanoparticles with an average particle size of 700 nm, 4 parts of metal compound flame retardant additive, 2 parts of coupling agent KH-550, 2 parts of lubricant talc, and 2 parts of antioxidant 1010.

[0053] Example 8

[0054] A high-performance composite material for cone crusher liners comprises the following components in parts by weight:

[0055] The composition includes 79 parts of semi-aromatic polyamide, 23.5 parts of fiber-reinforced filler, 16.5 parts of toughening agent maleic anhydride-grafted SEBS, 14 parts of brominated polystyrene, 12.5 parts of graphene, 2.5 parts of diatomaceous earth nanoparticles with an average particle size of 400 nm, 3.3 parts of metal compound flame retardant, 1.5 parts of coupling agent KH-550, 1.5 parts of lubricant talc, and 2.5 parts of antioxidant 1010.

[0056] Example 9

[0057] A high-performance composite material for cone crusher liners comprises the following components in parts by weight:

[0058] The composition includes 84 parts of semi-aromatic polyamide, 26 parts of fiber-reinforced filler, 15.5 parts of toughening agent maleic anhydride-grafted ethylene-octene copolymer, 16.5 parts of brominated polystyrene, 11.5 parts of graphene, 3.5 parts of diatomaceous earth nanoparticles with an average particle size of 700 nm, 4.2 parts of metal compound flame retardant, 2.2 parts of coupling agent KH-550, 1.8 parts of lubricant calcium stearate, and 2.1 parts of antioxidant 1010.

[0059] Example 10

[0060] A high-performance composite material for cone crusher liners comprises the following components in parts by weight:

[0061] 80 parts of semi-aromatic polyamide, 25 parts of fiber-reinforced filler, 15 parts of toughening agent maleic anhydride-grafted ethylene-octene copolymer, 15 parts of brominated polystyrene, 12 parts of graphene, 2 parts of diatomaceous earth nanoparticles with an average particle size of 400 nm, 4 parts of metal compound flame retardant additive, 2 parts of coupling agent KH-550, 2 parts of lubricant talc, and 2 parts of antioxidant 1010.

[0062] Comparative Example 1

[0063] A high-performance composite material for cone crusher liners comprises the following components in parts by weight:

[0064] 80 parts of semi-aromatic polyamide, 25 parts of fiber-reinforced filler, 15 parts of toughening agent maleic anhydride-grafted ethylene-octene copolymer, 15 parts of brominated polystyrene, 14 parts of graphene, 0 parts of diatomaceous earth nanoparticles with an average particle size of 400 nm, 4 parts of metal compound flame retardant additive, 2 parts of coupling agent KH-550, 2 parts of lubricant talc, and 2 parts of antioxidant 1010.

[0065] Comparative Example 2

[0066] A high-performance composite material for cone crusher liners comprises the following components in parts by weight:

[0067] 80 parts of semi-aromatic polyamide, 25 parts of fiber-reinforced filler, 15 parts of toughening agent maleic anhydride-grafted ethylene-octene copolymer, 15 parts of brominated polystyrene, 0 parts of graphene, 14 parts of diatomaceous earth nanoparticles with an average particle size of 400 nm, 4 parts of metal compound flame retardant additive, 2 parts of coupling agent KH-550, 2 parts of lubricant talc, and 2 parts of antioxidant 1010.

[0068] Comparative Example 3

[0069] A high-performance composite material for cone crusher liners comprises the following components in parts by weight:

[0070] 80 parts of semi-aromatic polyamide, 25 parts of fiber-reinforced filler, 15 parts of toughening agent maleic anhydride-grafted ethylene-octene copolymer, 15 parts of brominated polystyrene, 2 parts of graphene, 12 parts of diatomaceous earth nanoparticles with an average particle size of 400 nm, 4 parts of metal compound flame retardant additive, 2 parts of coupling agent KH-550, 2 parts of lubricant talc, and 2 parts of antioxidant 1010.

[0071] The high-performance conical breaker liner plates prepared in the above embodiments and comparative examples were injection molded into standard samples using composite materials. Their tensile strength was tested according to ISO 527, their flexural strength according to ISO 178, their notched impact strength according to ISO 179, and their flame retardancy according to UL94. The results are shown in the table below:

[0072]

[0073]

[0074] As shown in Tables 1 and 2, the unique two-dimensional layered structure of graphene in this invention can exert an excellent physical barrier effect and reduce the heat release rate in brominated polystyrene flame-retardant polyamide resin, thereby achieving a flame-retardant effect. The carbon walls formed by the stacked graphene create an excellent gas barrier layer, delaying the oxidative degradation of polyamide during ignition. In addition, the extremely large specific surface area of ​​graphene can induce the formation of a large number of dense carbon layers, preventing further thermal decomposition of the resin matrix. More importantly, during processing, the layered graphene structure can work synergistically with granular nano-diatomaceous earth to promote the dispersion of brominated polystyrene, improving the mechanical properties and flame-retardant effect of the composite material. The addition of diatomaceous earth nanoparticles can achieve the dual effect of improving component dispersibility and enhancing flame retardancy. Diatomaceous earth primarily functions as a flame retardant in the condensed phase by increasing the thermal decomposition temperature, decreasing the thermal decomposition rate, and reducing the heat release rate. The resulting char layer slows down the thermal decomposition of the material and prevents the generated heat from being conducted into the material's interior, thus achieving a flame retardant effect. Meanwhile, its granular structure interacts with layered graphene, promoting their dispersion. Simultaneously, the unique porous structure of diatomaceous earth can adsorb substances, effectively improving the compatibility between components and further enhancing the dispersion of brominated polystyrene, thereby improving the system's mechanical properties and flame retardant effect.

[0075] Specifically, compared to Example 10, Comparative Example 1 lacked diatomaceous earth nanoparticles. Although the tensile strength of the composite material did not change significantly, its impact toughness decreased substantially. Comparative Example 2 lacked graphene, resulting in a significant reduction in both mechanical properties and flame retardant effect. Comparative Examples 1 and 2 demonstrate that the absence of diatomaceous earth nanoparticles and graphene cannot effectively promote the dispersion of brominated polystyrene and its compatibility with polyamide resin. Furthermore, the addition of diatomaceous earth nanoparticles or graphene alone also leads to poor filler dispersibility, resulting in reduced flame retardancy and mechanical properties of the composite material. Comparative Example 3 shows that the addition of diatomaceous earth nanoparticles mainly improves component dispersibility and enhances flame retardancy. When the amount of diatomaceous earth nanoparticles or graphene is outside the scope of this invention, their improvement effect is limited; neither the flame-retardant and reinforcing effect of graphene nor the dispersing effect of diatomaceous earth nanoparticles can be utilized, leading to a decrease in the performance of the composite material.

[0076] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite material for high-performance conical breaker liners, characterized in that, The components include the following parts by weight: The composition includes 70-90 parts of semi-aromatic polyamide, 20-30 parts of fiber-reinforced filler, 10-20 parts of toughening agent, 10-20 parts of brominated polystyrene, 10-15 parts of graphene, 1-5 parts of diatomaceous earth nanoparticles, 2-6 parts of metal compound flame retardant, 0.5-3 parts of coupling agent, 0.5-3 parts of lubricant, and 0.5-3 parts of antioxidant; wherein the semi-aromatic polyamide is one or more of PA6T, PA6I, PA9T, PA9T / 66, PA10T, PA10T / 66, PA10T / 10I, PA10T / 1010, PA12T, and PA12I; the fiber-reinforced filler is glass fiber; and the metal compound flame retardant is antimony trioxide.

2. The composite material for a high-performance conical breaker liner as described in claim 1, characterized in that, The toughening agent is one or more of maleic anhydride-grafted polyethylene, maleic anhydride-grafted polypropylene, maleic anhydride-grafted ethylene propylene diene monomer (EPDM) rubber, maleic anhydride-grafted ethylene-octene copolymer, and maleic anhydride-grafted SEBS.

3. The composite material for a high-performance conical breaker liner as described in claim 1, characterized in that, The coupling agent is one or more of silane coupling agents and titanate coupling agents.

4. The composite material for a high-performance conical breaker liner as described in claim 1, characterized in that, The lubricant is one or more of the following: talc, silicone oil, calcium stearate, zinc stearate, polytetrafluoroethylene, paraffin wax, and polyethylene wax.

5. The composite material for a high-performance conical breaker liner as described in claim 1, characterized in that, The antioxidant is one or more of hindered phenolic antioxidants and phosphite antioxidants.

6. A method for preparing a high-performance conical breaker liner composite material as described in any one of claims 1-5, characterized in that, Includes the following steps: (1) Mix semi-aromatic polyamide, toughening agent, brominated polystyrene, graphene, diatomaceous earth nanoparticles, metal compound flame retardant, coupling agent, lubricant and antioxidant evenly to obtain a mixture; (2) The mixture is added into the twin-screw extruder from the main feed port, and the fiber-reinforced filler is added into the twin-screw extruder from the side feed port. The mixture is then extruded and granulated to obtain a high-performance conical breaker liner composite material.

7. The method for preparing a high-performance conical breaker liner composite material as described in claim 6, characterized in that, The twin-screw extruder has a screw speed of 300-600 r / min and an extrusion temperature of 260-330℃.

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