Regenerated nylon composite material, and preparation method and use therefor

Abstract

Provided in the present invention are a regenerated nylon composite material, and a preparation method and use therefor. The regenerated nylon composite material is prepared from nylon, recycled nylon particles A, recycled nylon particles B, maleic anhydride grafted ethylene propylene rubber, a toughening agent, a coupling agent, an antioxidant and a lubricant. The regenerated nylon composite material provided by the invention can improve the mechanical properties of recycled nylon, and achieve the reuse of recycled nylon. The mechanical properties of the regenerated nylon composite material reach the level close to that of nylon 6 or nylon 66.

Description

A regenerated nylon composite material and its preparation method and application Technical Field

[0001] The present invention belongs to the technical field of nylon composite materials, and in particular relates to a regenerated nylon composite material and a preparation method and application thereof. Background Art

[0002] Nylon, scientifically known as polyamide (PA), is one of the five major engineering plastics. It boasts excellent mechanical and physical properties, wear resistance, self-lubrication, oil resistance, and heat resistance. It is the most widely used thermoplastic engineering plastic both domestically and internationally, with nylon 6 and nylon 66 accounting for the largest share. A large amount of waste nylon plastic is generated globally each year. Its storage pollutes the environment and wastes significant management resources. In recent years, this issue has garnered increasing public attention, and its recycling, modification, and reuse are becoming increasingly urgent.

[0003] CN104004348A discloses a recycled nylon composite material with high thermal oxygen stability and heat resistance, and a preparation method thereof. The composite material is composed of the following components by mass: 46%-68.1% recycled nylon resin, 25%-35% glass fiber, 3%-8% toughening agent, 0.2%-1.0% antioxidant, 0.5%-2.0% lubricant, 2%-4% heat stabilizer, 1.0%-3.0% black masterbatch, and 0.2%-1.0% anti-hydrolysis agent. The recycled nylon composite material with high thermal oxygen stability and heat resistance provided by this technical solution utilizes the combined action of glass fiber and nylon to improve mechanical properties, heat resistance, and dimensional stability.

[0004] CN114672158A discloses a high-strength composite material based on regenerated nylon and a preparation method thereof. The high-strength composite material based on regenerated nylon comprises, by weight, 40-50 parts of regenerated nylon chips, 30-40 parts of matrix particles, 15-25 parts of polyolefin, 5-10 parts of reinforcing filler, 5-20 parts of glass fiber, and 1-5 parts of an additive. The regenerated nylon chips are prepared by the following steps: Step A1: Recycled nylon waste is crushed and added to a solution prepared by trifluoroethanol and phosphotungstic acid, the mixture is stirred and heated to 50-60°C to dissolve the recycled nylon, and then filtered and decolorized to obtain an impurity-removed solution; Step A2: The impurity-removed solution is mixed with an antioxidant, and the mixture is stirred at 75-80°C until the viscosity of the reaction system reaches 4000 cP. N-acetylcaprolactam and sodium hydroxide are dissolved in ethanol and added to the reaction system, and the mixture is heated to 145-160°C and stirred for 2-3 hours. The mixture is then cooled, dried, and crushed to obtain the regenerated nylon chips. The high-strength composite material based on recycled nylon provided by this technical solution contains about 30% recycled nylon added to its raw materials, and its strength index is similar to that of nylon 66, thus realizing the enhanced regeneration of nylon.

[0005] CN115044200A discloses a high-strength composite material for automotive structural parts made of recycled nylon. The material comprises the following raw materials: recycled nylon particles, a matrix resin, polyolefin, acrylic acid, methyl acrylate, and glass fiber. The recycled nylon particles are prepared by the following steps: Step A1: mixing the recycled nylon, a reinforcing agent, nano-montmorillonite, and an antioxidant, mixing the resulting melt into a molten material, extruding it, cooling, and cutting it to produce nylon slices; Step A2: adding the nylon slices, stearyl erucamide, and polyethylene glycol to N,N-dimethylformamide, heating and stirring to dissolve, then cooling to precipitate a solid, filtering, drying, and pulverizing it to produce the recycled nylon particles. The high-strength composite material for automotive structural parts made of recycled nylon provided by this technical solution has a tensile strength of 97 MPa and a notched impact strength of 19 kJ / m 2 , with good mechanical properties.

[0006] In the prior art, regenerated nylon is usually produced by adding fillers and glass fibers to improve its mechanical properties. However, the addition of fillers and glass fibers will reduce its toughness, increase its brittleness, and deteriorate its fluidity. The resulting regenerated nylon has limited application areas. At the same time, it cannot improve the problem of severe oxidation and molecular chain damage caused by long-term use and multiple processing of regenerated nylon.

[0007] Therefore, it is necessary to provide a regenerated nylon composite material to improve the problem of molecular chain damage of recycled nylon and enhance the mechanical properties.

[0008] Summary of the Invention

[0009] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a regenerated nylon composite material and its preparation method and application, which can improve the problem of molecular chain damage in recycled nylon, improve mechanical properties, and realize the reuse of recycled nylon.

[0010] To achieve this object, the present invention adopts the following technical solutions:

[0011] In a first aspect, the present invention provides a regenerated nylon composite material, wherein the raw materials for preparing the regenerated nylon composite material include nylon, recycled nylon particles A, recycled nylon particles B, maleic anhydride grafted EPDM rubber, a toughening agent, a coupling agent, an antioxidant and a lubricant.

[0012] In the present invention, nylon, recycled nylon particles A, recycled nylon particles B, maleic anhydride grafted EPDM rubber, a toughening agent, a coupling agent, an antioxidant and a lubricant are compounded, wherein the coupling agent and the recycled nylon particles B serve as reaction aids. The maleic anhydride grafted EPDM rubber can react with the recycled nylon particles A and nylon to improve mechanical properties and viscoelasticity, thereby improving the compatibility of the components and making the recycled nylon and nylon more evenly dispersed. The mechanical properties of the prepared recycled nylon composite material reach a level similar to that of nylon 6 or nylon 66.

[0013] Preferably, the nylon comprises nylon 6 and / or nylon 66.

[0014] Preferably, the raw materials for preparing the recycled nylon particles A include 10-undecene-1-ol, recycled nylon and a toughening agent.

[0015] Preferably, the raw materials for preparing the recycled nylon particles A include the following components in parts by weight: 2-10 parts (for example, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts or 9 parts, etc.) of 10-undecen-1-ol, 85-97 parts (for example, 86 parts, 87 parts, 88 parts, 89 parts, 90 parts, 91 parts, 92 parts, 93 parts, 94 parts, 95 parts or 96 parts, etc.) of recycled nylon, and 1-5 parts (for example, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, etc.) of toughening agent.

[0016] In the present invention, the raw materials for preparing the recycled nylon particles A, 10-undecene-1-ol, recycled nylon, and a toughening agent are mixed and extruded, and the molecular chains of the recycled nylon are re-reacted, chain-extended, and cross-linked, so that the resulting recycled nylon particles A have good dispersion uniformity. If the weight fraction of 10-undecene-1-ol is too large, the recycled nylon particles A will be brittle. If the weight fraction of 10-undecene-1-ol is too small, the chain extension reaction of the recycled nylon particles A will not be complete, and the resulting recycled nylon composite material will have low mechanical properties.

[0017] Preferably, the raw materials for preparing the recycled nylon particles B include butene glycol, recycled nylon and a coupling agent.

[0018] Preferably, the raw materials for preparing the recycled nylon particles B include the following components in parts by weight: 1-5 parts (e.g., 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, etc.) of butene glycol, 90-98 parts (e.g., 91 parts, 92 parts, 93 parts, 94 parts, 95 parts, 96 parts or 97 parts, etc.) of recycled nylon, and 1-5 parts (e.g., 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, etc.) of coupling agent.

[0019] In the present invention, the coupling agent in the raw materials for preparing the recycled nylon particles B can induce and assist the reaction between butenediol and the recycled nylon, thereby reconnecting the molecular segments of the recycled nylon. The butenediol reacts with the recycled nylon to form a copolymer of butenediol and recycled nylon, reconnecting the molecular segments of the recycled nylon, improving the strength of the regenerated nylon composite material while maintaining the rigidity and toughness of the nylon. If the weight fraction of butenediol is too large, the recycled nylon particles B react excessively, making crosslinking difficult to extrude. If the weight fraction of butenediol is too small, the reaction of the recycled nylon particles B is incomplete, resulting in low mechanical properties of the resulting regenerated nylon composite material.

[0020] Preferably, the toughening agent in the raw material for preparing the regenerated nylon composite material and the toughening agent in the raw material for preparing the recycled nylon particles A each independently include any one or a combination of at least two of methyl methacrylate-butadiene-styrene copolymer, maleic anhydride grafted ethylene-octene copolymer elastomer, ethylene-butyl acrylate-glycidyl methacrylate copolymer, ethylene-methyl acrylate-glycidyl methacrylate copolymer or methyl methacrylate-styrene-silicone copolymer.

[0021] Preferably, the coupling agent in the raw material for preparing the regenerated nylon composite material and the coupling agent in the raw material for preparing the recycled nylon particles B each independently include any one of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidyloxypropyltrimethoxysilane or γ-glycidyloxypropyltriethoxysilane, or a combination of at least two thereof.

[0022] Preferably, the antioxidant includes any one or a combination of at least two of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 2,6-tributyl-4-methylphenol, bis(3,5-tributyl-4-hydroxyphenyl)sulfide, triethylene glycol bis-β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate or N,N'-bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine.

[0023] Preferably, the lubricant includes any one of pentaerythritol stearate, ethylene wax or silicone oil, or a combination of at least two of them.

[0024] Preferably, the raw materials for preparing the recycled nylon composite material include the following components in parts by weight: 15-75 parts of nylon, 20-85 parts of recycled nylon particles A, 2-10 parts of recycled nylon particles B, 1-5 parts of maleic anhydride grafted EPDM rubber, 0.1-2 parts of toughening agent, 0.5-5 parts of coupling agent, 0.01-5 parts of antioxidant and 0.01-5 parts of lubricant.

[0025] The weight proportions of nylon in the raw materials for preparing the regenerated nylon composite material may be 16 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts or 70 parts, etc.

[0026] The weight proportion of the recycled nylon particles A in the raw materials for preparing the regenerated nylon composite material can be 25 parts, 35 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts or 80 parts, etc.

[0027] The weight proportion of the recycled nylon particles B in the raw materials for preparing the regenerated nylon composite material can be 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts or 9 parts, etc.

[0028] The weight proportion of maleic anhydride grafted EPDM rubber in the raw materials for preparing the regenerated nylon composite material can be 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts.

[0029] The weight proportion of the toughening agent in the raw materials for preparing the regenerated nylon composite material can be 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, 1 part, 1.2 parts, 1.4 parts, 1.6 parts or 1.8 parts, etc.

[0030] The weight proportion of the coupling agent in the raw materials for preparing the regenerated nylon composite material may be 0.6 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts.

[0031] The weight proportion of the antioxidant in the raw materials for preparing the regenerated nylon composite material can be 0.1 parts, 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, etc.

[0032] The weight proportion of the lubricant in the raw materials for preparing the regenerated nylon composite material can be 0.1 parts, 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, etc.

[0033] In the present invention, if the mass fraction of maleic anhydride grafted EPDM rubber is too large, the regenerated nylon composite material will be excessively cross-linked and difficult to extrude; if the mass fraction of maleic anhydride grafted EPDM rubber is too small, the cross-linking reaction of the regenerated nylon composite material will be incomplete and the mechanical properties will not be significantly improved.

[0034] In a second aspect, the present invention provides a method for preparing the recycled nylon composite material as described in the first aspect, the preparation method comprising the following steps: mixing nylon, recycled nylon particles A, recycled nylon particles B, maleic anhydride grafted EPDM rubber, a toughening agent, a coupling agent, an antioxidant and a lubricant, and extruding to obtain the recycled nylon composite material.

[0035] In a third aspect, the present invention provides a use of the regenerated nylon composite material as described in the first aspect in the preparation of fasteners, coils, cable connectors or gears.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] In the present invention, a recycled nylon composite material is prepared by compounding nylon, recycled nylon particles A, recycled nylon particles B, maleic anhydride grafted EPDM rubber, a toughening agent, a coupling agent, an antioxidant, and a lubricant. This improves the mechanical properties of the recycled nylon and enables the reuse of the recycled nylon. The mechanical properties of the recycled nylon composite material reach a level similar to that of nylon 6 or nylon 66. The recycled nylon composite material has a tensile strength of 70-80 MPa, a flexural modulus of 3100-3410 MPa, a flexural strength of 112-123 MPa, and an impact strength of 5-8 kJ / m 2 , preferably, the tensile strength is 79-80MPa, the flexural modulus is 3200-3220MPa, the flexural strength is 119-120MPa, and the impact strength is 7.5-8KJ / m 2 . DETAILED DESCRIPTION

[0038] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0039] Example 1

[0040] This embodiment provides a recycled nylon composite material and a preparation method thereof, wherein the recycled nylon composite material comprises the following components by weight: 36 parts of nylon (nylon 66, with a melt index of 15 g / 10 min at a temperature of 260° C. and a load of 2.16 kg), 50 parts of recycled nylon particles A, and 50 parts of recycled nylon particles B. 8 parts, maleic anhydride grafted EPDM rubber (grafting rate is 3%, the melt index at a temperature of 190°C and a load of 2.16 kg is 5 g / 10 min) 3 parts, a toughening agent (ethylene-methyl acrylate-glycidyl methacrylate copolymer, the content of methyl acrylate component in ethylene-methyl acrylate-glycidyl methacrylate copolymer is 24wt%, the content of glycidyl methacrylate component is 8wt%, the melt index at a temperature of 190°C and a load of 2.16 kg is 6 g / 10 min) 0.5 parts, a coupling agent (γ-aminopropyltrimethoxysilane) 2.2 parts, an antioxidant (β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate) 0.2 parts and a lubricant (pentaerythritol stearate) 0.1 parts.

[0041] The recycled nylon particles A are prepared by mixing 6 parts by weight of 10-undecen-1-ol, 92 parts by weight of recycled nylon (recycled nylon 66, with a melt index of 30 g / 10 min at a temperature of 260° C. and a load of 2.16 kg) and 2 parts by weight of a toughening agent (ethylene-methyl acrylate-glycidyl methacrylate copolymer, wherein the methyl acrylate component content of the ethylene-methyl acrylate-glycidyl methacrylate copolymer is 24% by weight and the glycidyl methacrylate component content is 8% by weight, and the melt index is 6 g / 10 min at a temperature of 190° C. and a load of 2.16 kg) and extruding the mixture through a twin-screw extruder at a temperature of 260° C. to obtain the recycled nylon particles A.

[0042] The recycled nylon particles B are prepared by mixing 2 parts by weight of butene glycol, 95 parts by weight of recycled nylon (recycled nylon 66, with a melt index of 30 g / 10 min at a temperature of 260° C. and a load of 2.16 kg) and 3 parts by weight of a coupling agent (γ-aminopropyltrimethoxysilane), and extruding the mixture through a twin-screw extruder at a temperature of 250° C. to obtain the recycled nylon particles B.

[0043] The preparation method of the regenerated nylon composite material is as follows:

[0044] Nylon, recycled nylon particles A, recycled nylon particles B, EPDM rubber grafted maleic anhydride, a toughening agent, a coupling agent, an antioxidant and a lubricant are mixed and extruded through a twin-screw extruder to obtain the regenerated nylon composite material.

[0045] Example 2

[0046] This embodiment provides a recycled nylon composite material and a preparation method thereof. The recycled nylon composite material comprises the following components by weight: 15 parts of nylon (nylon 66, with a melt index of 8 g / 10 min at a temperature of 260° C. and a load of 2.16 kg), 70 parts of recycled nylon particles A, and 100 parts of recycled nylon particles B. 2 parts, maleic anhydride grafted EPDM rubber (grafting rate is 1.5%, the melt index at a temperature of 190°C and a load of 2.16 kg is 8 g / 10 min) 5 parts, toughening agent (maleic anhydride grafted ethylene-octene copolymer elastomer, the octene content in the ethylene-octene copolymer is 30wt%, the grafting rate of maleic anhydride is 1.05%, the melt index at a temperature of 190°C and a load of 2.16 kg is 3 g / 10 min) 2 parts, coupling agent (γ-glycidyloxypropyltrimethoxysilane) 0.5 parts, antioxidant (2,6-tributyl-4-methylphenol) 5 parts and lubricant (ethylene wax) 0.5 parts.

[0047] The recycled nylon particles A are prepared by mixing 10 parts by weight of 10-undecene-1-ol, 85 parts by weight of recycled nylon (recycled nylon 66, with a melt index of 20 g / 10 min at a temperature of 260° C. and a load of 2.16 kg), and 5 parts by weight of a toughening agent (maleic anhydride-grafted ethylene-octene copolymer elastomer, with an octene content of 30 wt %, a maleic anhydride grafting rate of 1.05%, and a melt index of 3 g / 10 min at a temperature of 190° C. and a load of 2.16 kg), and extruding the mixture through a twin-screw extruder at a temperature of 250° C. to obtain the recycled nylon particles A.

[0048] The recycled nylon particles B were prepared by mixing 5 parts by weight of butene glycol, 90 parts by weight of recycled nylon (recycled nylon 66, melt index of 20 g / 10 min at a temperature of 260° C. and a load of 2.16 kg) and 5 parts by weight of a coupling agent (γ-glycidyloxypropyltrimethoxysilane), and extruding the mixture through a twin-screw extruder at a temperature of 240° C. to obtain the recycled nylon particles B.

[0049] The preparation method of the regenerated nylon composite material is as follows:

[0050] Nylon, recycled nylon particles A, recycled nylon particles B, maleic anhydride grafted EPDM rubber, a toughening agent, a coupling agent, an antioxidant and a lubricant are mixed and extruded through a twin-screw extruder to obtain the regenerated nylon composite material.

[0051] Example 3

[0052] This embodiment provides a regenerated nylon composite material and a preparation method thereof. The regenerated nylon composite material comprises the following components in parts by weight: 58.4 parts of nylon (nylon 66, with a melt index of 25 g / 10 min at a temperature of 260° C. and a load of 2.16 kg), 20 parts of recycled nylon particles A, 10 parts of recycled nylon particles B, 1 part of maleic anhydride grafted EPDM rubber (grafting rate of 4%, melt index of 3 g / 10 min at a temperature of 190° C. and a load of 2.16 kg), and 1 part of a toughening agent (ethylene-propylene diene monomer). The present invention relates to a novel ethylene-methyl acrylate-glycidyl methacrylate copolymer, wherein the content of methyl acrylate component in ethylene-methyl acrylate-glycidyl methacrylate copolymer is 24wt%, the content of glycidyl methacrylate component is 8wt%, and the melt index at a temperature of 190°C and a load of 2.16 kg is 6 g / 10min), 0.1 part of a coupling agent (γ-aminopropyltriethoxysilane), 5 parts of an antioxidant (bis(3,5-tributyl-4-hydroxyphenyl) sulfide) and 5 parts of a lubricant (pentaerythritol stearate).

[0053] The recycled nylon particles A were prepared by mixing 2 parts by weight of 10-undecen-1-ol, 97 parts by weight of recycled nylon (recycled nylon 66, with a melt index of 40 g / 10 min at a temperature of 260° C. and a load of 2.16 kg), and 1 part by weight of a toughening agent (ethylene-methyl acrylate-glycidyl methacrylate copolymer, wherein the methyl acrylate component content of the ethylene-methyl acrylate-glycidyl methacrylate copolymer is 24% by weight and the glycidyl methacrylate component content is 8% by weight, and the melt index is 6 g / 10 min at a temperature of 190° C. and a load of 2.16 kg). The mixture was extruded through a twin-screw extruder at a temperature of 270° C. to obtain the recycled nylon particles A.

[0054] The recycled nylon particles B are prepared by mixing 1 part by weight of butene glycol, 98 parts by weight of recycled nylon (recycled nylon 66, with a melt index of 40 g / 10 min at a temperature of 260° C. and a load of 2.16 kg) and 1 part by weight of a coupling agent (γ-aminopropyltriethoxysilane), and extruding the mixture through a twin-screw extruder at a temperature of 260° C. to obtain the recycled nylon particles B.

[0055] The preparation method of the regenerated nylon composite material is as follows:

[0056] Nylon, recycled nylon particles A, recycled nylon particles B, maleic anhydride grafted EPDM rubber, a toughening agent, a coupling agent, an antioxidant and a lubricant are mixed and extruded through a twin-screw extruder to obtain the regenerated nylon composite material.

[0057] Example 4

[0058] This embodiment provides a recycled nylon composite material and a preparation method thereof. The only difference between this embodiment and Example 1 is that, in the preparation of the recycled nylon particles A, the weight fraction of 10-undecen-1-ol is adjusted to 1, and the rest is the same as Example 1.

[0059] Example 5

[0060] This embodiment provides a recycled nylon composite material and a preparation method thereof. The only difference between this embodiment and Example 1 is that, in the preparation of the recycled nylon particles A, the weight fraction of 10-undecen-1-ol is adjusted to 12, and the rest is the same as Example 1.

[0061] Example 6

[0062] This embodiment provides a recycled nylon composite material and a preparation method thereof. The only difference between this embodiment and Example 1 is that the weight fraction of the recycled nylon particles B is adjusted to 1 part, and the weight fraction of nylon 66 is adjusted to 43 parts. The rest is the same as Example 1.

[0063] Example 7

[0064] This embodiment provides a recycled nylon composite material and a preparation method thereof. The only difference between this embodiment and Example 1 is that the weight fraction of the recycled nylon particles B is adjusted to 11 parts, and the weight fraction of nylon 66 is adjusted to 33 parts. The rest is the same as Example 1.

[0065] Comparative Example 1

[0066] This comparative example provides a regenerated nylon composite material and a preparation method thereof. The only difference between the comparative example and Example 1 is that the raw materials for preparing the regenerated nylon composite material do not include recycled nylon particles B and maleic anhydride-grafted EPDM rubber, and the weight proportion of nylon 66 is adjusted to 47 parts. The rest is the same as Example 1.

[0067] Comparative Example 2

[0068] This comparative example provides a regenerated nylon composite material and a preparation method thereof. The only difference between the comparative example and Example 1 is that the raw materials for preparing the regenerated nylon composite material do not include maleic anhydride grafted EPDM rubber, the weight portion of nylon 66 is adjusted to 39 parts, and the rest is the same as Example 1.

[0069] Comparative Example 3

[0070] This comparative example provides a regenerated nylon composite material and a preparation method thereof. The only difference between the comparative example and Example 1 is that the raw materials for preparing the regenerated nylon composite material do not include recycled nylon particles B, the weight portion of nylon 66 is adjusted to 44 parts, and the rest is the same as Example 1.

[0071] The following performance tests were performed on the recycled nylon composite materials provided in the examples and comparative examples.

[0072] (1) Tensile properties: Elongation at break and tensile strength were tested according to ISO 527-1.

[0073] (2) Flexural properties: Flexural modulus and flexural strength were tested according to ISO 178.

[0074] (3) Impact performance: The notched impact strength of a simply supported beam was tested according to ISO 179. The test environment temperature was 23° C. and the humidity was 50%.

[0075] The test results are shown in Table 1.

[0076] Table 1

[0077] According to the test results in Table 1, the tensile strength of the recycled nylon composite materials provided by Examples 1-7 is 70-80 MPa, the flexural modulus is 3100-3410 MPa, the flexural strength is 112-123 MPa, and the impact strength is 5-8 KJ / m2 The recycled nylon composite materials provided in Examples 1-3 have a tensile strength of 79-80 MPa, a flexural modulus of 3200-3220 MPa, a flexural strength of 119-120 MPa, and an impact strength of 7.5-8 KJ / m 2 .

[0078] Compared with Example 1, if the weight fraction of 10-undecene-1-ol in the preparation of recycled nylon particles A is too low (Example 4), the toughness of the obtained regenerated nylon composite material is reduced, and both the tensile strength and impact strength are reduced; if the weight fraction of 10-undecene-1-ol in the preparation of recycled nylon particles A is too high (Example 5), the regenerated nylon composite material has high rigidity and high brittleness, and the tensile strength and impact strength are reduced. It is proved that when the weight fraction of 10-undecene-1-ol in the preparation of recycled nylon particles A is within a specific range, the performance of the prepared regenerated nylon composite material is better.

[0079] Compared with Example 1, if the weight percentage of recycled nylon particles B is too low (Example 6), the material's toughness decreases, and its tensile strength, flexural strength, and impact strength all decline. If the weight percentage of recycled nylon particles B is too high (Example 7), the flexural modulus and flexural strength decrease. This demonstrates that within a specific weight range of recycled nylon particles B, the prepared regenerated nylon composite material exhibits superior performance.

[0080] Compared with Example 1, if the recycled nylon particles B and maleic anhydride grafted EPDM rubber are not added (Comparative Example 1), the rigidity and toughness of the prepared recycled nylon composite material are low, and the tensile strength, flexural strength and impact strength are all low.

[0081] Compared with Example 1, if maleic anhydride grafted EPDM rubber is not added (Comparative Example 2), the rigidity and toughness are low, and the tensile strength, flexural strength and impact strength are all low.

[0082] Compared with Example 1, if the recycled nylon particles B are not added (Comparative Example 3), the rigidity and toughness are low, and the tensile strength, flexural strength and impact strength are also low.

[0083] The applicant declares that the present invention uses the above-described embodiments to illustrate a regenerated nylon composite material, its preparation method, and its application. However, the present invention is not limited to the above-described embodiments, and this does not necessarily mean that the present invention must rely on the above-described embodiments in order to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions for various raw materials in the present invention, additions of auxiliary components, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A recycled nylon composite material, characterized in that: The raw materials for preparing the regenerated nylon composite material include nylon, recycled nylon particles A, recycled nylon particles B, maleic anhydride grafted ethylene propylene rubber, a toughening agent, a coupling agent, an antioxidant and a lubricant.

2. The recycled nylon composite material according to claim 1, characterized in that: The nylon includes nylon 6 and / or nylon 66; Preferably, the raw materials for preparing the recycled nylon particles A include 10-undecene-1-ol, recycled nylon and a toughening agent; Preferably, the raw materials for preparing the recycled nylon particles A include the following components by weight: 2-10 parts of 10-undecene-1-ol, 5-97 parts of recycled nylon 8 and 1-5 parts of a toughening agent.

3. The regenerated nylon composite material according to claim 1 or 2, characterized in that: The raw materials for preparing the recycled nylon particles B include butene glycol, recycled nylon and a coupling agent; Preferably, the raw materials for preparing the recycled nylon particles B include the following components by weight: 1-5 parts of butene glycol, 90-98 parts of recycled nylon and 1-5 parts of coupling agent.

4. The regenerated nylon composite material according to claim 2 or 3, characterized in that: The toughening agent in the raw material for preparing the regenerated nylon composite material and the toughening agent in the raw material for preparing the recycled nylon particles A independently include any one of methyl methacrylate-butadiene-styrene copolymer, maleic anhydride grafted ethylene-octene copolymer elastomer, ethylene-butyl acrylate-glycidyl methacrylate copolymer, ethylene-methyl acrylate-glycidyl methacrylate copolymer or methyl methacrylate-styrene-silicone copolymer or a combination of at least two thereof.

5. The regenerated nylon composite material according to claim 3 or 4, characterized in that: The coupling agent in the raw material for preparing the regenerated nylon composite material and the coupling agent in the raw material for preparing the recycled nylon particles B independently include any one of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidyloxypropyltrimethoxysilane or γ-glycidyloxypropyltriethoxysilane or a combination of at least two thereof.

6. The regenerated nylon composite material according to any one of claims 1 to 5, characterized in that: The antioxidant includes any one or a combination of at least two of β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 2,6-tributyl-4-methylphenol, bis(3,5-tributyl-4-hydroxyphenyl) sulfide, triethylene glycol bis-β-(3-tert-butyl-4-hydroxy-5-methylphenyl) propionate or N,N'-bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexanediamine.

7. The regenerated nylon composite material according to any one of claims 1 to 6, characterized in that: The lubricant includes any one of pentaerythritol stearate, ethylene wax or silicone oil, or a combination of at least two of them.

8. The regenerated nylon composite material according to any one of claims 1 to 7, characterized in that: The raw materials for preparing the recycled nylon composite material include the following components in parts by weight: 15-75 parts of nylon, 20-85 parts of recycled nylon particles A, 2-10 parts of recycled nylon particles B, 1-5 parts of maleic anhydride grafted EPDM rubber, 0.1-2 parts of toughening agent, 0.5-5 parts of coupling agent, 0.01-5 parts of antioxidant and 0.01-5 parts of lubricant.

9. The method for preparing a regenerated nylon composite material according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: mixing nylon, recycled nylon particles A, recycled nylon particles B, maleic anhydride grafted EPDM rubber, toughening agent, coupling agent, antioxidant and lubricant, and extruding to obtain the recycled nylon composite material.

10. Use of the regenerated nylon composite material according to any one of claims 1 to 8 in the preparation of fasteners, coils, cable connectors or gears.

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