Zinc-aluminum-magnesium alloy steel-plastic co-extrusion composite material for floor and preparation method thereof

Abstract

The application relates to the technical field of high polymer composite materials, in particular to a zinc-aluminum-magnesium alloy steel-plastic co-extrusion floor composite material and a preparation method thereof, which comprises the following components in percentage by mass: 70-80% PE resin; 10-20% PMMA resin; 5-10% toughening agent; 2-5% compatilizer; 0.5-2% antioxidant; 0.5-1% light stabilizer; 1-5% light absorber; 1-2% lubricant; the above raw materials are weighed according to the proportion, mixed uniformly in a high-speed batching stirrer, melt-extruded and granulated in a double-screw extruder, and after water tank cooling, granulation and drying treatment, the composite material is obtained; through formula synergistic modification, the performance goals of low gloss, high wear resistance, excellent aging resistance and size stability of the material are realized; meanwhile, the application also provides a preparation method of the alloy material, which is simple, controllable and suitable for industrial large-scale production.

Description

Technical Field

[0001] This invention relates to the field of polymer composite materials technology, and in particular to a zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring composite material and its preparation method. Background Technology

[0002] Wood-plastic composites, as a new type of composite material that combines the advantages of plastics and wood, have been widely used in building decoration, transportation, industrial flooring, interior and exterior decoration and other fields due to their corrosion resistance, wear resistance, environmental protection and recyclability. At present, most wood-plastic composites on the market are made of general plastics such as polyethylene and polypropylene as the matrix and compounded with plant fibers.

[0003] However, existing wood-plastic composite materials still have significant technical defects when applied to the surface layer of zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring: First, insufficient aging resistance. The molecular structure of general-purpose plastics such as polyethylene contains easily oxidized tertiary carbon atoms, which are prone to photo-oxidative degradation and thermo-oxidative degradation reactions under outdoor ultraviolet radiation, high temperature environment, and humid conditions, leading to the breakage of material molecular chains, performance degradation, and a serious shortening of the service life of steel-plastic flooring; Second, the surface gloss of the products is too high. Existing wood-plastic materials are mostly high-gloss surfaces, which are significantly different from the matte texture of natural wood, resulting in insufficient aesthetics and difficulty in meeting the market demand for high-end building materials; Third, poor matching between dimensional stability and weather resistance. Zinc-aluminum-magnesium alloy steel substrate has a specific coefficient of thermal expansion, and the coefficient of thermal expansion of existing wood-plastic materials is poorly matched with that of steel. In environments with large temperature differences, problems such as peeling, warping, and cracking of the surface layer from the substrate are prone to occur.

[0004] Therefore, developing a PE-based composite material that combines low gloss, high aging resistance, and excellent dimensional stability to meet the application requirements of zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address the aforementioned problems in the existing technology, a zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring composite material and its preparation method are provided.

[0006] The specific technical solution is as follows: Design a composite material for zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring, comprising the following components by weight percentage: 70-80% PE resin; 10-20% PMMA resin; 5-10% toughening agent; 2-5% compatibilizer; 0.5-2% antioxidant; 0.5-1% light stabilizer; 1-5% matting agent; 1-2% lubricant.

[0007] Furthermore, the PE resin is high-density polyethylene resin, and its melt flow rate is 2-3 g / 10 min under 190℃ and 2.16 kg load conditions.

[0008] Furthermore, the melt flow rate of the PMMA resin is 10-15 g / 10 min at 230°C and 5 kg load.

[0009] Furthermore, the toughening agent is one or more of ethylene-methacrylic acid copolymer and ethylene-octene copolymer.

[0010] Furthermore, the compatibilizer is one or more of the following: ethylene-methyl acrylate-glycidyl methacrylate random terpolymer, maleic anhydride-grafted polyethylene, and maleic anhydride-grafted polypropylene.

[0011] Furthermore, the matting agent is one or more of cross-linked polystyrene resin (cross-linked SAN), silica, and ultrafine modified talc.

[0012] Furthermore, the antioxidant is composed of a primary antioxidant and a secondary antioxidant in a mass ratio of 2:1; the primary antioxidant is tetrakis[β-(3,5-ditert-butyl-4-hydroxyphenyl)propionate] pentanetraol ester, and the secondary antioxidant is tris(2,4-di-tert-butylphenol) phosphite.

[0013] Furthermore, the lubricant is one or more of ethylene bis-stearamide and polyethylene wax.

[0014] A method for preparing the above-mentioned zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring composite material mainly includes the following steps: S1. Accurately weigh each raw material component according to the mass percentage described in claim 1, and set aside for later use; S2. Add the weighed PE resin, PMMA resin, toughening agent, compatibilizer, antioxidant, matting agent, and lubricant to the high-speed batching mixer in the order of addition, mix evenly, and obtain a premix. S3. The premixed material is fed into a twin-screw extruder for melt extrusion granulation. After cooling in a water tank, pelletizing, and drying, the composite material is obtained.

[0015] Furthermore, in step S2, the high-speed stirring speed is 400-600 r / min, and the stirring time is 5-10 min.

[0016] Further, in step S3, the twin-screw extruder is a co-rotating twin-screw extruder with a length-to-diameter ratio of 40:1-48:1, and the extrusion process conditions are: first stage temperature 170-190℃, second to fifth stage temperature 180-200℃, sixth to ninth stage temperature 190-210℃, and die head temperature 180-200℃; main screw speed 350-450 r / min, and feed screw speed 25-30 r / min.

[0017] The above technical solution has the following advantages or beneficial effects: 1. Excellent performance and strong adaptability: By compounding PE and PMMA resins and combining toughening agents and compatibilizers for synergistic modification, the composite material has both high tensile strength, high impact resistance and excellent dimensional stability. The coefficient of thermal expansion is highly compatible with the zinc-aluminum-magnesium alloy steel substrate. After compounding, there are no problems such as warping, peeling and cracking, which can meet the performance requirements of steel-plastic flooring for long-term use.

[0018] 2. Low gloss, high wear resistance, beautiful and practical: By adding specific types and amounts of matting agents, the microstructure of the material surface is controlled to achieve a gloss level of ≤60GS at 60°, and as low as 20GS under optimal conditions, which is close to the texture of natural wood. At the same time, PMMA resin increases the surface hardness of the material. With the help of antioxidants and lubricants, the products have excellent wear resistance and scratch resistance, and combine beauty and practicality.

[0019] 3. Outstanding aging and weather resistance: The compound antioxidant and light stabilizer form a dual protection system, which effectively inhibits the oxidative degradation and photoaging reaction of the material during processing and outdoor use. After 2000 hours of photoaging test, the color difference value ΔE≤0.81, which is far superior to existing materials and significantly extends the service life of steel plastic flooring.

[0020] 4. Controllable process, suitable for industrialization: The preparation method is simple, the raw material ratio is reasonable, the twin-screw extrusion process parameters are controllable, the raw materials are evenly dispersed, and there are no processing defects such as melt fracture and filler agglomeration. It can achieve continuous and large-scale production, the production cost is controllable, and it has good market promotion value. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0023] The present invention will be further described below with reference to specific embodiments, but these are not intended to limit the scope of the invention.

[0024] The following abbreviations are explained: PE resin refers to polyethylene, PMMA resin refers to polymethyl methacrylate, EAA refers to ethylene-methacrylic acid copolymer, POE refers to ethylene-octene copolymer, and cross-linked SAN refers to cross-linked polystyrene resin. A zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring composite material, comprising the following components by weight percentage: 70-80% PE resin; 10-20% PMMA resin; 5-10% toughening agent; 2-5% compatibilizer; 0.5-2% antioxidant; 0.5-1% light stabilizer; 1-5% matting agent; 1-2% lubricant.

[0025] In some alternative embodiments, the PE resin is high-density polyethylene resin with a melt flow rate of 2-3 g / 10 min at 190°C and a load of 2.16 kg.

[0026] In some alternative embodiments, the melt flow rate of PMMA resin is 10-15 g / 10 min at 230°C and 5 kg load.

[0027] In some alternative embodiments, the toughening agent is one or more of ethylene-methacrylic acid copolymer (EAA) and ethylene-octene copolymer (POE).

[0028] In some alternative embodiments, the compatibilizer is one or more of ethylene-methyl acrylate-glycidyl methacrylate random terpolymer, maleic anhydride-grafted polyethylene, and maleic anhydride-grafted polypropylene.

[0029] In some alternative embodiments, the matting agent is one or more of cross-linked polystyrene resin (cross-linked SAN), silica, and ultrafine modified talc.

[0030] In some optional embodiments, the antioxidant is composed of a primary antioxidant and a secondary antioxidant in a mass ratio of 2:1; the primary antioxidant is tetrakis[β-(3,5-ditert-butyl-4-hydroxyphenyl)propionate] pentanetraol ester, and the secondary antioxidant is tris(2,4-di-tert-butylphenol) phosphite.

[0031] In some alternative embodiments, the lubricant is one or more of ethylene bis-stearamide and polyethylene wax.

[0032] A method for preparing the above-mentioned zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring composite material mainly includes the following steps: S1. Accurately weigh each raw material component according to the mass percentage described in claim 1, and set aside for later use; S2. Add the weighed PE resin, PMMA resin, toughening agent, compatibilizer, antioxidant, matting agent, and lubricant to the high-speed batching mixer in the order of addition, mix evenly, and obtain a premix. S3. The premixed material is fed into a twin-screw extruder for melt extrusion granulation. After cooling in a water tank, pelletizing, and drying, the composite material is obtained.

[0033] In some alternative embodiments, in step S2, the high-speed stirring speed is 400-600 r / min and the stirring time is 5-10 min.

[0034] In some optional embodiments, in step S3, the twin-screw extruder is selected as a co-rotating twin-screw extruder with a length-to-diameter ratio of 40:1-48:1, and the extrusion process conditions are: first stage temperature 170-190℃, second to fifth stage temperature 180-200℃, sixth to ninth stage temperature 190-210℃, and die head temperature 180-200℃; main screw speed 350-450 r / min, and feed screw speed 25-30 r / min.

[0035] All raw materials used are commercially available industrial-grade raw materials. The specific grades and sources are as follows: PE resin: 5000S, Sinopec; PMMA resin: V150, Arkema; Toughening agent: EAA 20E482, DuPont; Compatibilizer: SMA 1000, DuPont; Matting agent: Cross-linked polystyrene resin, Compton; Lubricant: EBS, Indonesia; Antioxidant: 1010+168 (mass ratio 2:1), extremely prone to chemical reactions; Light stabilizer: UV-326, extremely easy to process.

[0036] The following examples illustrate the specific application of the present invention. Examples 1-5 all employ the formulation system and preparation method of the present invention. The mass percentage ratio of each raw material component is detailed in Table 1.

[0037] The preparation method is as follows: 1. Accurately weigh each raw material according to the proportions shown in Table 1; 2. Add the raw materials in the following order: PE resin, PMMA resin, toughening agent, compatibilizer, antioxidant, light stabilizer, matting agent, and lubricant to a high-speed batching mixer. Stir at 500 r / min for 8 minutes until the mixture is homogeneous. 3. The premixed material is fed into a co-rotating twin-screw extruder with a length-to-diameter ratio of 44:1. The extrusion process parameters are set as follows: first stage temperature 180℃, second to fifth stage temperature 190℃, sixth to ninth stage temperature 200℃, and die head temperature 190℃; main screw speed 400r / min, and feed screw speed 28r / min. After melt extrusion, cooling, pelletizing, and drying, the composite material is obtained. Example 1

[0038] This invention discloses a composite material for zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring, specifically comprising the following steps: S1. Weigh each raw material according to the mass fraction: 70% PE resin, 20% PMMA resin, 4% toughening agent, 2% compatibilizer, 1% matting agent, 1% lubricant, 1% antioxidant, and 1% light stabilizer.

[0039] S2. Add PE resin, PMMA resin, toughening agent, compatibilizer, antioxidant, matting agent, lubricant, and light stabilizer to a high-speed batching mixer in sequence and mix evenly; set the low-speed mixing speed to 500 r / min and the mixing time to 8 min.

[0040] S3. The premixed material is added from the main feed port into a co-rotating twin-screw extruder with a length-to-diameter ratio of 44:1 for melt extrusion and granulation. After cooling in a water tank, pelletizing, and drying, a special alloy material for the co-extruded surface layer of zinc-aluminum-magnesium alloy steel-plastic is prepared. The process conditions of the twin-screw extruder are as follows: the temperature of the first stage of the twin screw is 170-190℃, the second stage is 180-200℃, the third stage is 190-200℃, the fourth stage is 190-200℃, the fifth stage is 190-200℃, the sixth stage is 190-200℃, the seventh stage is 190-210℃, the eighth stage is 190-210℃, the ninth stage is 190-210℃, the tenth stage is 190-200℃, the die head temperature is 180-200℃, the screw speed of the main extruder is 350-450 r / min, and the speed of the hopper feed screw is 25-30 r / min. Example 2

[0041] This invention discloses a composite material for zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring, specifically comprising the following steps: S1. Weigh each raw material according to the mass fraction: 70% PE resin, 17% PMMA resin, 5% toughening agent, 3% compatibilizer, 2% matting agent, 1% lubricant, 1% antioxidant, and 1% light stabilizer.

[0042] S2. Add PE resin, PMMA resin, toughening agent, compatibilizer, antioxidant, matting agent, lubricant, and light stabilizer to a high-speed batching mixer in sequence and mix evenly; set the low-speed mixing speed to 500 r / min and the mixing time to 8 min.

[0043] S3. The premixed material is added from the main feed port into a co-rotating twin-screw extruder with a length-to-diameter ratio of 44:1 for melt extrusion and granulation. After cooling in a water tank, pelletizing, and drying, a special alloy material for the co-extruded surface layer of zinc-aluminum-magnesium alloy steel-plastic is prepared. The process conditions of the twin-screw extruder are as follows: the temperature of the first stage of the twin screw is 170-190℃, the second stage is 180-200℃, the third stage is 190-200℃, the fourth stage is 190-200℃, the fifth stage is 190-200℃, the sixth stage is 190-200℃, the seventh stage is 190-210℃, the eighth stage is 190-210℃, the ninth stage is 190-210℃, the tenth stage is 190-200℃, the die head temperature is 180-200℃, the screw speed of the main extruder is 350-450 r / min, and the speed of the hopper feed screw is 25-30 r / min. Example 3

[0044] This invention discloses a composite material for zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring, specifically comprising the following steps: S1. Weigh each raw material according to the mass fraction: 70% PE resin, 15% PMMA resin, 5% toughening agent, 3% compatibilizer, 3% matting agent, 1% lubricant, 2% antioxidant, and 1% light stabilizer.

[0045] S2. Add PE resin, PMMA resin, toughening agent, compatibilizer, antioxidant, matting agent, lubricant, and light stabilizer to a high-speed batching mixer in sequence and mix evenly; set the low-speed mixing speed to 500 r / min and the mixing time to 8 min.

[0046] S3. The premixed material is added from the main feed port into a co-rotating twin-screw extruder with a length-to-diameter ratio of 44:1 for melt extrusion and granulation. After cooling in a water tank, pelletizing, and drying, a special alloy material for the co-extruded surface layer of zinc-aluminum-magnesium alloy steel-plastic is prepared. The process conditions of the twin-screw extruder are as follows: the temperature of the first stage of the twin screw is 170-190℃, the second stage is 180-200℃, the third stage is 190-200℃, the fourth stage is 190-200℃, the fifth stage is 190-200℃, the sixth stage is 190-200℃, the seventh stage is 190-210℃, the eighth stage is 190-210℃, the ninth stage is 190-210℃, the tenth stage is 190-200℃, the die head temperature is 180-200℃, the screw speed of the main extruder is 350-450 r / min, and the speed of the hopper feed screw is 25-30 r / min. Example 4

[0047] This invention discloses a composite material for zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring, specifically comprising the following steps: S1. Weigh each raw material according to the mass fraction: 70% PE resin, 15% PMMA resin, 5% toughening agent, 3% compatibilizer, 4% matting agent, 1% lubricant, 1% antioxidant, and 1% light stabilizer.

[0048] S2. Add PE resin, PMMA resin, toughening agent, compatibilizer, antioxidant, matting agent, lubricant, and light stabilizer to a high-speed batching mixer in sequence and mix evenly; set the low-speed mixing speed to 500 r / min and the mixing time to 8 min.

[0049] S3. The premixed material is added from the main feed port into a co-rotating twin-screw extruder with a length-to-diameter ratio of 44:1 for melt extrusion and granulation. After cooling in a water tank, pelletizing, and drying, a special alloy material for the co-extruded surface layer of zinc-aluminum-magnesium alloy steel-plastic is prepared. The process conditions of the twin-screw extruder are as follows: the temperature of the first stage of the twin screw is 170-190℃, the second stage is 180-200℃, the third stage is 190-200℃, the fourth stage is 190-200℃, the fifth stage is 190-200℃, the sixth stage is 190-200℃, the seventh stage is 190-210℃, the eighth stage is 190-210℃, the ninth stage is 190-210℃, the tenth stage is 190-200℃, the die head temperature is 180-200℃, the screw speed of the main extruder is 350-450 r / min, and the speed of the hopper feed screw is 25-30 r / min. Example 5

[0050] This invention discloses a composite material for zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring, specifically comprising the following steps: S1. Weigh each raw material according to the mass fraction: 70% PE resin, 13% PMMA resin, 5% toughening agent, 3% compatibilizer, 5% matting agent, 1% lubricant, 2% antioxidant, and 1% light stabilizer.

[0051] S2. Add PE resin, PMMA resin, toughening agent, compatibilizer, antioxidant, matting agent, lubricant, and light stabilizer to a high-speed batching mixer in sequence and mix evenly; set the low-speed mixing speed to 500 r / min and the mixing time to 8 min.

[0052] S3. The premixed material is added from the main feed port into a co-rotating twin-screw extruder with a length-to-diameter ratio of 44:1 for melt extrusion and granulation. After cooling in a water tank, pelletizing, and drying, a special alloy material for the co-extruded surface layer of zinc-aluminum-magnesium alloy steel-plastic is prepared. The process conditions of the twin-screw extruder are as follows: the temperature of the first stage of the twin screw is 170-190℃, the second stage is 180-200℃, the third stage is 190-200℃, the fourth stage is 190-200℃, the fifth stage is 190-200℃, the sixth stage is 190-200℃, the seventh stage is 190-210℃, the eighth stage is 190-210℃, the ninth stage is 190-210℃, the tenth stage is 190-200℃, the die head temperature is 180-200℃, the screw speed of the main extruder is 350-450 r / min, and the speed of the hopper feed screw is 25-30 r / min.

[0053] In addition, to highlight the effects of the present invention, the following two sets of comparative examples are provided: Comparative Example 1

[0054] This comparative example describes a zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring composite material, which specifically includes the following steps: S1. Weigh each raw material according to the mass fraction: 70% PE resin, 17% PMMA resin, 5% toughening agent, 3% compatibilizer, 2% matting agent, 1% lubricant, 0.5% antioxidant, and 0.5% light stabilizer.

[0055] S2. Add PE resin, PMMA resin, toughening agent, compatibilizer, matting agent, antioxidant, lubricant, and light stabilizer to a high-speed batching mixer in sequence and mix evenly; set the low-speed mixing speed to 500 r / min and the mixing time to 8 min.

[0056] S3. The premixed material is added from the main feed port into a co-rotating twin-screw extruder with a length-to-diameter ratio of 44:1 for melt extrusion and granulation. After cooling in a water tank, pelletizing, and drying, a special alloy material for the co-extruded surface layer of zinc-aluminum-magnesium alloy steel-plastic is prepared. The process conditions of the twin-screw extruder are as follows: the temperature of the first stage of the twin screw is 170-190℃, the second stage is 180-200℃, the third stage is 190-200℃, the fourth stage is 190-200℃, the fifth stage is 190-200℃, the sixth stage is 190-200℃, the seventh stage is 190-210℃, the eighth stage is 190-210℃, the ninth stage is 190-210℃, the tenth stage is 190-200℃, the die head temperature is 180-200℃, the screw speed of the main extruder is 350-450 r / min, and the speed of the hopper feed screw is 25-30 r / min. Comparative Example 2

[0057] This comparative example describes a zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring composite material, which specifically includes the following steps: S1. Weigh each raw material according to the mass fraction: 70% PE resin, 21% PMMA resin, 5% toughening agent, 3% compatibilizer, and 1% lubricant.

[0058] S2. Add PE resin, PMMA resin, toughening agent, compatibilizer, and lubricant to the high-speed batching mixer in sequence and mix evenly; set the low-speed mixing speed to 500 r / min and the mixing time to 8 min.

[0059] S3. The premixed material is added from the main feed port into a co-rotating twin-screw extruder with a length-to-diameter ratio of 44:1 for melt extrusion and granulation. After cooling in a water tank, pelletizing, and drying, a special alloy material for the co-extruded surface layer of zinc-aluminum-magnesium alloy steel-plastic is prepared. The process conditions of the twin-screw extruder are as follows: the temperature of the first stage of the twin screw is 170-190℃, the second stage is 180-200℃, the third stage is 190-200℃, the fourth stage is 190-200℃, the fifth stage is 190-200℃, the sixth stage is 190-200℃, the seventh stage is 190-210℃, the eighth stage is 190-210℃, the ninth stage is 190-210℃, the tenth stage is 190-200℃, the die head temperature is 180-200℃, the screw speed of the main extruder is 350-450 r / min, and the speed of the hopper feed screw is 25-30 r / min.

[0060] Table 1: Formulations of Examples 1-5 and Comparative Examples 1-2 raw material components Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 PE resin 70% 70% 70% 70% 70% 70% 70% PMMA resin 20% 17% 15% 15% 13% 17% 21% toughening agent 4% 5% 5% 5% 5% 5% 5% compatibilizer 2% 3% 3% 3% 3% 3% 3% matting agent 1% 2% 3% 4% 5% 2% 0 lubricant 1% 1% 1% 1% 1% 1% 1% antioxidants 1% 1% 2% 1% 2% 0.5% 0 Light stabilizers 1% 1% 1% 1% 1% 0.5% 0 Performance testing The PE / PMMA zinc-aluminum-magnesium alloy steel-plastic co-extruded surface alloy materials prepared in Examples 1-5 were tested for cantilever beam notched impact strength, tensile strength, elongation at break, flexural strength, flexural modulus, gloss, and melt flow index. The test results are detailed in Table 2. The cantilever beam notched impact strength test was conducted according to ASTM D256 standard, the tensile strength and elongation at break test were conducted according to ASTM D638 standard, the flexural strength and flexural modulus test were conducted according to ASTM D790 standard, the gloss test was conducted according to ASTM D523 standard, the melt flow index test was conducted according to ASTM D1238 standard, and the light aging test was conducted according to GB / T14522-2008 cyclic standard.

[0061] Table 2: Performance test table of composite materials prepared in Examples 1-5 and Comparative Examples 1-2 Test Project Test conditions Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Notched impact strength of cantilever beam (J / m) 1 / 8〞,23℃ 123.45 137.26 140.56 168.23 183.28 125.32 102.28 Tensile strength (MPa) 50mm / min 40.38 44.61 48.13 53.28 56.77 40.65 43.55 Elongation at break (%) 50mm / min 25.80 28.16 30.56 40.18 55.24 27.42 24.56 Bending strength (MPa) 2mm / min 70.36 63.36 62.75 60.64 61.28 65.57 66.23 Flexural modulus (MPa) 2mm / min 2458.56 2375.32 2358.12 2326.3 2256.21 2475.36 2511.47 Gloss (GS) 60° 56 42 35 23 20 60 68 Melt index (g / 10min) 190℃, 2.16KG 9.61 9.38 8.26 7.64 7.22 9.56 10.12 Photoaging test (2000 hours) Irradiation: 8h, (60±3)℃; Condensation: 4h, (50±3)℃ ΔE≤0.75 ΔE≤0.81 ΔE≤0.55 ΔE≤0.62 ΔE≤0.76 ΔE≤1.17 ΔE≤1.67

[0062] The core properties of the alloy material, the performance differences between the examples and the comparative examples, and the internal performance change patterns of the examples are clear. The specific analysis is as follows: Combining the formulation in Table 1 and the performance data in Table 2, it can be seen that the synergistic effect of each component in this invention is significant, and the dosage of the formulation directly determines the product performance. I. The effect of matting agents on the regulation of surface gloss The amount of matting agent used is significantly negatively correlated with gloss. In Examples 1-5, the amount of matting agent was gradually increased from 1% to 5%, and the gloss at a 60° angle gradually decreased from 56GS to 20GS, with the matte effect improving step by step, fully meeting the low-gloss requirements of high-end building materials. Comparative Example 2, without the addition of matting agent, had a gloss as high as 68GS, exhibiting the high-gloss texture of conventional wood-plastic composite materials, but with poor appearance. Comparative Example 1 had the same amount of matting agent added as Example 2, but insufficient amounts of antioxidants and light stabilizers, resulting in a gloss of 60GS, slightly higher than Example 2, indicating that weather-resistant additives can also slightly assist in optimizing the surface condition. This proves that matting agent is the core component for achieving a low-matte texture, and the gloss can be flexibly adjusted within the 1-5% dosage range to adapt to different scenario requirements.

[0063] II. The decisive influence of antioxidants and light stabilizers on weather resistance The color difference value ΔE in the 2000-hour accelerated photoaging test directly reflects the weather resistance. In Examples 1-5, the total amount of antioxidant and light stabilizer was 2-3%, and the color difference value was controlled within 0.81. Among them, the color difference value of Example 3, after optimizing the antioxidant ratio, was as low as 0.55, with the best aging resistance. There was no obvious yellowing, discoloration, or embrittlement after long-term outdoor use. Comparative Example 1 only added 0.5% antioxidant and 0.5% light stabilizer, and the amount of additives was insufficient. The color difference value rose to 1.17, and the weather resistance was greatly reduced. Comparative Example 2 did not add any antioxidants or light stabilizers. The color difference value was as high as 1.67, and the aging degradation was serious. It could not meet the requirements for outdoor use at all. This fully demonstrates that the compounding of antioxidants and light stabilizers is the key to improving the weather resistance of materials. The synergistic effect of the two can effectively block photo-oxidative and thermo-oxidative degradation and ensure the long service life of the flooring.

[0064] III. Synergistic Optimization of Mechanical Properties by Toughening Agents and Compatibilizers The impact strength, tensile strength, and elongation at break of the cantilever beam gradually improved with the optimization of the toughening agent and compatibilizer dosage. In Example 1, the dosage of toughening agent and compatibilizer was relatively low, resulting in relatively low impact strength and tensile strength. In Examples 2-5, the dosage of toughening agent and compatibilizer was optimized to the optimal ratio, and the PMMA dosage was moderately reduced. The impact strength increased from 123.45 J / m to 183.28 J / m, and the elongation at break increased from 25.80% to 55.24%, with a significant improvement in toughness. At the same time, the tensile strength maintained a steady increase, achieving a perfect balance between rigidity and toughness. The flexural strength and flexural modulus decreased slightly, which is a normal fluctuation after toughening modification. They are still far higher than the standards for steel-plastic flooring and fully meet the requirements for load-bearing and impact resistance. Comparative Example 2, without the addition of weathering additives and matting agents, had the worst toughness, with an impact strength of only 102.28 J / m. This indicates that the lack of functional additives not only affects weather resistance and appearance but also indirectly damages the system compatibility and reduces mechanical properties.

[0065] IV. Melt Flow Index and Processing Compatibility Analysis In Examples 1-5, the melt flow index gradually decreased with formulation optimization, resulting in moderate fluidity suitable for co-extrusion processes of zinc-aluminum-magnesium alloy steel and plastics. This avoided unstable extrusion due to poor fluidity or uneven co-extrusion surface thickness due to excessive fluidity. In Comparative Example 2, no functional additives were added, resulting in a melt flow index as high as 10.12 g / 10 min, leading to poor processing stability and difficulty in co-extrusion molding. Under the formulations of the Examples, the melt flow index was controlled in the range of 7.22-9.61 g / 10 min, exhibiting optimal processing fluidity and making it suitable for industrial continuous co-extrusion production.

[0066] V. Overall Performance Conclusion This invention, through the precise proportions and synergistic effects of PE resin, PMMA resin, toughening agent, compatibilizer, compounded weather-resistant additives, and matting agent, prepares a PE / PMMA alloy material that completely solves the pain points of conventional wood-plastic composite materials, such as high gloss, poor weather resistance, and uneven mechanical properties. It possesses a low-gloss texture, excellent aging resistance, high toughness and rigidity, good processing fluidity, and strong compatibility with zinc-aluminum-magnesium alloy steel substrates. After co-extrusion, there are no warping, cracking, or peeling issues. Comparative Example 1, due to insufficient weather-resistant additives, and Comparative Example 2, due to the absence of weather-resistant additives and matting agent, have significantly inferior overall performance compared to the embodiments of this invention, further confirming the scientific nature and innovation of the formulation of this invention.

[0067] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite material for zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring, characterized in that, By weight percentage, it includes the following components: 70-80% PE resin; 10-20% PMMA resin; 5-10% toughening agent; 2-5% compatibilizer; 0.5-2% antioxidant; 0.5-1% light stabilizer; 1-5% matting agent; 1-2% lubricant.

2. The composite material for zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring according to claim 1, characterized in that, The PE resin is high-density polyethylene resin, and its melt flow rate is 2-3 g / 10 min under 190℃ and 2.16 kg load conditions.

3. The composite material for zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring according to claim 1, characterized in that, The melt flow rate of the PMMA resin is 10-15 g / 10 min at 230°C and 5 kg load.

4. The composite material for zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring according to claim 1, characterized in that, The toughening agent is one or more of ethylene-methacrylic acid copolymer (EAA) and ethylene-octene copolymer (POE).

5. The composite material for zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring according to claim 4, characterized in that, The compatibilizer is one or more of the following: ethylene-methyl acrylate-glycidyl methacrylate random terpolymer, maleic anhydride-grafted polyethylene, and maleic anhydride-grafted polypropylene.

6. The composite material for zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring according to claim 1, characterized in that, The matting agent is one or more of cross-linked polystyrene resin (cross-linked SAN), silica, and ultrafine modified talc.

7. The composite material for zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring according to claim 1, characterized in that, The antioxidant is composed of a primary antioxidant and a secondary antioxidant in a mass ratio of 2:1; the primary antioxidant is tetrakis[β-(3,5-ditert-butyl-4-hydroxyphenyl)propionate] pentanetraol ester, and the secondary antioxidant is tris(2,4-di-tert-butylphenol) phosphite.

8. The composite material for zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring according to claim 1, characterized in that, The lubricant is one or more of ethylene bis-stearamide and polyethylene wax.

9. A method for preparing the zinc-aluminum-magnesium alloy steel-plastic co-extruded flooring composite material according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Accurately weigh each raw material component according to the mass percentage described in claim 1, and set aside for later use; S2. Add the weighed PE resin, PMMA resin, toughening agent, compatibilizer, antioxidant, matting agent, and lubricant to the high-speed batching mixer in the order of addition, mix evenly, and obtain a premix; S3. The premixed material is fed into a twin-screw extruder for melt extrusion granulation. After cooling in a water tank, pelletizing, and drying, the composite material is obtained.

10. The preparation method according to claim 9, characterized in that, In step S2, the high-speed stirring speed is 400-600 r / min, and the stirring time is 5-10 min.

11. The preparation method according to claim 9, characterized in that, In step S3, the twin-screw extruder is a co-rotating twin-screw extruder with a length-to-diameter ratio of 40:1-48:1, and the extrusion process conditions are: first stage temperature 170-190℃, second to fifth stage temperature 180-200℃, sixth to ninth stage temperature 190-210℃, and die head temperature 180-200℃; main screw speed 350-450 r / min, and feed screw speed 25-30 r / min.