Resin alloy material as well as preparation method and application thereof

Abstract

The invention discloses a resin alloy material as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The resin alloy material comprises the following components: PET (Polyethylene Terephthalate) resin, PP (Polypropylene) resin and a compatilizer, the melting point of the PET resin is less than or equal to 200 DEG C; the cantilever beam notch impact strength of the PP resin is greater than or equal to 400J / m; the compatilizer comprises at least two of PP (Polypropylene) grafted maleic anhydride, POE (Polyolefin Elastomer) grafted maleic anhydride, POE grafted GMA (Glycidyl Methacrylate) and SEBS (Styrene-Ethylene-Butylene-Styrene) grafted maleic anhydride. According to the resin alloy material, through compounding of specific components, the mechanical strength of the resin alloy material is guaranteed, meanwhile, the shrinkage rate is reduced, the compatibility problem of PET and PP is solved, rigid-tough balance is achieved, a workpiece prepared from the obtained resin alloy material is not prone to being broken, the strength is high, and the resin alloy material is suitable for being used in the field of household appliance products and has wide application prospects. The method is especially suitable for preparing household appliance shells.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a resin alloy material, its preparation method, and its application. Background Technology

[0002] Polyethylene terephthalate (PET) is a milky white or light yellow, highly crystalline polymer with excellent physical and mechanical properties over a wide temperature range, with a service temperature up to 120°C. It also exhibits excellent electrical insulation. Furthermore, due to the presence of ester bonds in its structure, PET decomposes under the influence of strong acids, strong alkalis, and water vapor, thus possessing good resistance to organic solvents and weathering, making it an important engineering plastic. However, PET's slow crystallization rate and difficult molding process result in poor toughness and impact resistance, limiting its applications.

[0003] To overcome these limitations, researchers have attempted to optimize PET's properties and broaden its application areas by alloying it with other resins. Polypropylene (PP) has become a popular choice for alloying with PET resin due to its excellent processing fluidity, chemical stability, and cost advantages. However, PET and PP have significant differences in molecular structure and polarity, resulting in extremely poor interfacial compatibility and making it difficult to form alloys. Consequently, the mechanical strength of the alloyed materials is insufficient to meet practical application requirements. Furthermore, PET and PP have different stiffness and toughness, making it a major challenge to balance the rigidity and toughness of the resulting alloyed materials. Summary of the Invention

[0004] The present invention aims to at least solve one of the aforementioned technical problems existing in the prior art. Therefore, the object of the present invention is to provide a resin alloy material, which is formed by composite of a specific PET and PP, and by introducing a specific compatibilizer to solve the compatibility problem of the system, so that the resulting resin alloy material achieves a balance of rigidity and toughness, possessing high rigidity, high toughness, and low shrinkage.

[0005] A second aspect of the present invention is to provide a method for preparing a resin alloy material.

[0006] A third aspect of the present invention is to provide an application of a resin alloy material.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A first aspect of the present invention provides a resin alloy material, wherein the components of the resin alloy material include PET resin, PP resin and a compatibilizer; The melting point of the PET resin is ≤200℃; the notched cantilever impact strength of the PP resin is ≥400J / m; The compatibilizer includes at least two of the following: PP grafted with maleic anhydride, POE grafted with maleic anhydride, POE grafted with GMA, and SEBS grafted with maleic anhydride.

[0008] Conventional PET resin typically has a melting point above 250℃. When alloyed with PP resin (which generally has a processing temperature of 180-200℃), the large temperature difference leads to processing difficulties. This invention selects a low-melting-point PET resin to form a resin alloy with high-impact PP resin, improving the material's processing performance and compensating for the brittleness of PET resin, providing better toughness and reducing shrinkage. Furthermore, because PET resin is a polar resin and PP resin is a non-polar resin, the two materials have extremely poor compatibility when alloyed, easily leading to delamination and mechanical properties far lower than either PET or PP resin alone. Therefore, this invention selects specific compatibilizers, using at least two of the following: PP grafted with maleic anhydride, POE grafted with maleic anhydride, POE grafted with GMA (glycidyl methacrylate), and SEBS grafted with maleic anhydride. This significantly improves the PET and PP interface and enhances the overall performance of the resin alloy.

[0009] Preferably, the resin alloy material comprises the following components by mass parts: 20-70 parts PET resin, 20-70 parts PP resin, 2-8 parts compatibilizer, 0-20 parts filler, 0-1 part lubricant, and 0-0.5 parts antioxidant.

[0010] More preferably, the mass fractions of the filler, lubricant, and antioxidant are not zero.

[0011] More preferably, the resin alloy material comprises the following components by mass fraction: 20-60 parts PET resin, 30-60 parts PP resin, 2-8 parts compatibilizer, 1-20 parts filler, 0.1-1 part lubricant, and 0.1-0.5 parts antioxidant.

[0012] More preferably, the resin alloy material comprises the following components by mass fraction: 20-40 parts PET resin, 40-60 parts PP resin, 2-8 parts compatibilizer, 10-20 parts filler, 0.1-1 part lubricant, and 0.1-0.5 parts antioxidant.

[0013] Preferably, the compatibilizer is a mixture of PP grafted with maleic anhydride and POE grafted with GMA.

[0014] More preferably, the mass ratio of the PP grafted with maleic anhydride to the PP grafted with GMA is 1:(1~2).

[0015] This invention further utilizes PP grafted with maleic anhydride and POE grafted with GMA as compatibilizers. The maleic anhydride groups can undergo esterification with the terminal hydroxyl groups of PET, forming chemical bonds that effectively reduce the interfacial tension between PET and PP, decrease phase separation, and improve the rigidity of the alloy material. Furthermore, PP grafted with maleic anhydride exhibits better compatibility with PP resin. The addition of POE grafted with GMA as a compatibilizer allows the epoxy groups in the POE grafted with GMA to react with the carboxyl or hydroxyl groups of PET, while the POE elastomer segments are compatible with PP. The elastic phase of POE is dispersed in the alloy, absorbing impact energy and simultaneously achieving compatibilization and toughening of the alloy material. The GMA reaction seals the polar end groups of PET, reducing the alloy's water absorption and improving dimensional stability. Therefore, this invention, by selecting a compound compatibilizer and controlling the ratio between the two, utilizes PP grafted with maleic anhydride to preferentially improve the PET / PP interface, while POE grafted with GMA fills interfacial defects, forming a "rigid-elastic" dual-network structure, thus better synergistically improving the overall performance of the material.

[0016] Preferably, the grafting rates of the PP grafted with maleic anhydride and the POE grafted with GMA are independently selected from any value of ≥0.8%.

[0017] More preferably, the grafting rate of the PP grafted with maleic anhydride and / or the POE grafted with GMA is 0.8-0.9%.

[0018] Choosing a compatibilizer with a specific grafting ratio can reduce the amount added and lower costs.

[0019] Preferably, the filler includes at least one of calcium carbonate, barium sulfate, and wollastonite.

[0020] Preferably, the average particle size of the filler is 0.1~10μm.

[0021] More preferably, the average particle size of the filler is 0.5~5μm.

[0022] More preferably, the average particle size of the filler is 0.5~3μm.

[0023] Preferably, the whiteness of the filler is ≥95%.

[0024] More preferably, the whiteness of the filler is 95-98%.

[0025] Specifically, this invention selects barium sulfate, calcium carbonate, or wollastonite with high whiteness and low particle size as fillers. On the one hand, adding these specific fillers can fill interfacial defects in resin alloy materials, which is beneficial to improving the compatibility of the resin alloy materials. Calcium carbonate and barium sulfate do not significantly change the crystal structure of PP or PET, while talc or other fillers promote heterogeneous nucleation, increasing crystallinity but leading to increased brittleness. On the other hand, these fillers are beneficial to improving the gloss and whiteness of resin alloy materials and reducing production costs. More preferably, the fillers are barium sulfate and / or calcium carbonate, which can further reduce costs and reduce the damage to toughness caused by fillers.

[0026] Preferably, the melting point of the PET resin is 160~200℃.

[0027] More preferably, the melting point of the PET resin is 180~200℃.

[0028] Preferably, the intrinsic viscosity of the PET resin at room temperature is 0.6~0.8 dl / g.

[0029] Preferably, the melt flow index of the PP resin at 230°C and 2.16 kg load is 5~35 g / 10 min.

[0030] More preferably, the melt flow index of the PP resin at 230°C and 2.16 kg load is 20~30 g / 10 min.

[0031] More preferably, the melt flow index of the PP resin at 230°C and 2.16 kg load is 25~30 g / 10 min.

[0032] Preferably, the lubricant is a silicone masterbatch with an effective ingredient content of >50%; the carrier of the silicone masterbatch is PP.

[0033] This invention further adds high-concentration PP carrier silicone masterbatch. Silicone masterbatch is a modified additive with organosilicon compounds as its core. When the resin alloy material melts, it releases organosilicon components, reduces friction between the melt and the equipment, reduces energy loss, and avoids scratches on the material surface. In injection molding, extrusion and other processes, it helps the finished product to quickly leave the mold by forming a uniform silicone oil layer. The alloy materials of PET and PP have poor compatibility. By adding silicone masterbatch, it makes it easier to demold during injection molding and reduces defective products caused by ejection cracking.

[0034] Preferably, the antioxidant includes at least one of hindered phenolic antioxidants and phosphite antioxidants.

[0035] A second aspect of the present invention provides a method for preparing the resin alloy material described in the first aspect of the present invention, comprising the following steps: The resin alloy material is obtained by mixing, melting, and extruding the components of the resin alloy material.

[0036] Specifically, the “components” refer to the components of the resin alloy material, including PET resin, PP resin and compatibilizer, and further include fillers, lubricants and antioxidants.

[0037] Preferably, the extrusion temperature is 180~220℃.

[0038] More preferably, the extrusion is performed using a twin-screw extruder.

[0039] A third aspect of the present invention provides the application of the resin alloy material described in the first aspect of the present invention in the manufacture of household appliances.

[0040] The resin alloy material obtained by this invention combines the characteristics of PET and PP through formula design and component control, and solves the problems of system compatibility, rigidity-toughness balance and processing performance. This makes the alloy material more rigid and tough, and the parts do not delaminate. It has the advantages of balanced rigidity and toughness and low shrinkage rate, and can be used in the preparation of home appliances.

[0041] Compared with the prior art, the beneficial effects of the present invention are: 1) The resin alloy material provided by this invention solves the temperature difference problem in the processing of PET and PP by selecting PET resin and PP resin with specific parameters. Simultaneously, the high-impact PP resin compensates for the brittleness of PET resin, providing good toughness to the alloy material, thereby achieving a balance between rigidity and toughness and improving the overall performance of the material. Specifically, the cantilever beam impact strength of the resin alloy material obtained by this invention is ≥100 J / m, elongation at break is ≥80%, tensile strength is ≥25 MPa, and flexural strength is ≥35 MPa.

[0042] 2) The resin alloy material provided by this invention incorporates two compatibilizers containing maleic anhydride groups and / or epoxy groups of GMA, thereby improving the compatibility of the resin alloy material system and enhancing its overall performance, especially its processing performance and reducing its shrinkage rate to ≤1.5%. Furthermore, the compatibilizer is a combination of PP grafted with maleic anhydride and POE grafted with GMA. The maleic anhydride groups undergo esterification with the terminal hydroxyl groups of PET, forming chemical bonds that effectively reduce the interfacial tension between PET and PP resins, decrease phase separation, and improve the rigidity of the resin alloy material. The epoxy groups react with the carboxyl or hydroxyl groups of PET resin, while the POE elastomer segments are compatible with PP resin. The elastic phase of POE is dispersed in the alloy material, absorbing impact energy and simultaneously achieving compatibilization and toughening of the resin alloy material. This solves the problems of poor compatibility and high brittleness of traditional PET and PP alloys, significantly improving both tensile and flexural strength.

[0043] 3) By further selecting specific fillers, the present invention reduces the destructive effect of fillers on the toughness of resin alloy materials, thereby giving the resin alloy materials of the present invention better toughness.

[0044] 4) The resin alloy material preparation method provided by the present invention is simple, and the product quality is stable and the production cost is low, making it suitable for large-scale production.

[0045] 5) The resin alloy material obtained by this invention not only has high mechanical strength, good rigidity and toughness, but also solves the compatibility problem between PET resin and PP resin. The parts do not delaminate and have the advantages of balanced rigidity and toughness and low shrinkage. It has a wide range of applications, especially suitable for the preparation of household appliances. Detailed Implementation

[0046] The present invention will be further described in detail below through specific embodiments. Unless otherwise specified, the raw materials, reagents, or apparatus used in the embodiments and comparative examples are all available from conventional commercial sources or can be obtained by existing technical methods. Unless otherwise specified, the test or experimental methods are conventional methods in the art.

[0047] The raw materials used in the following embodiments and comparative examples of the present invention are described below: PP resin 1 (polypropylene resin 1): K9930, Maoming Petrochemical, melt index 28g / 10min (230℃ / 2.16Kg), cantilever beam notched impact strength 700J / m; PP Resin 2 (Polypropylene Resin 2): PP EP548R, CNOOC Shell, melt index 28g / 10min (230℃ / 2.16Kg), cantilever beam notched impact strength 120J / m; PP resin 3 (polypropylene resin 2): PP EP300H, CNOOC Shell, melt index 3g / 10min (230℃ / 2.16Kg), cantilever beam notched impact strength 650J / m; PET resin 1 (polyethylene terephthalate resin 1): GX302H, Jiangyin Huashang New Materials, intrinsic viscosity 0.7dl / g, melting point 180℃; PET resin 2 (polyethylene terephthalate resin 2): YS-W01, Hainan Yisheng, intrinsic viscosity 0.8dl / g, melting point 250℃; Compatibilizer 1: PP grafted with maleic anhydride, GPM200JS, Ningbo Nengzhiguang, grafting rate 0.8%; Compatibilizer 2: POE grafted with GMA, E515, Ningbo Nengzhiguang, grafting rate 0.8%; Compatibilizer 3: POE grafted with maleic anhydride, W1, KOAS Chemical, grafting rate 0.8%; Filler 1: Calcium carbonate, Dongguan Wuxin New Materials, whiteness 96.5%, average particle size 3.0μm; Filler 2: Barium sulfate, Hongzhi New Materials, M700, whiteness 97%, average particle size 0.7μm; Filler 3: Talc, Dongguan Wuxin New Material, HY-TA08, whiteness 93%, average particle size 4.75μm; Lubricant: PP carrier silicone masterbatch, Dow Corning, MB50-001; Antioxidants: Hindered phenolic and phosphite compound antioxidants, B215, Mitutoyo.

[0048] The following detailed description is provided in conjunction with specific embodiments and comparative examples.

[0049] Examples 1-5 Examples 1-5 provide a resin alloy material, the formulation of which is shown in Table 1. The preparation method includes the following steps: PP resin, PET resin, compatibilizer, filler, lubricant and antioxidant are mixed and added to a twin-screw extruder through the main feed port. After mixing and melting, the mixture is extruded and granulated by the twin-screw extruder to obtain a resin alloy material. The extrusion temperatures of zones one to eleven of the twin-screw extruder are 190℃, 200℃, 210℃, 210℃, 205℃, 205℃, 205℃, 200℃, 200℃, 200℃ and 190℃, respectively.

[0050] Table 1. Formulation table (parts by weight) of resin alloy materials in Examples 1-5

[0051] Comparative Example 1 This comparative example provides a resin alloy material, which differs from Example 1 in that PET resin 1 (GX302H) is replaced with an equal amount of PET resin 2 (YS-W01); the specific formulation and dosage are shown in Table 2, and the preparation method is the same as in Example 1.

[0052] Comparative Example 2 This comparative example provides a resin alloy material, which differs from Example 3 in that PP resin 1 (K9930) is replaced with an equal amount of PP resin 2 (EP548R); the specific formulation and dosage are shown in Table 2, and the preparation method is the same as in Example 3.

[0053] Comparative Example 3 This comparative example provides a resin alloy material, which differs from Example 3 in that PP resin 1 (K9930) is replaced with an equal amount of PP resin 3 (EP300H); the specific formulation and dosage are shown in Table 2, and the preparation method is the same as in Example 3.

[0054] Comparative Example 4 This comparative example provides a resin alloy material, which differs from Example 2 in that compatibilizer 2 (E515) is replaced with compatibilizer 1 (GPM200JS) in equal amounts; the specific formulation and dosage are shown in Table 2, and the preparation method is the same as in Example 2.

[0055] Comparative Example 5 This comparative example provides a resin alloy material, which differs from Example 2 in that compatibilizer 1 (GPM200JS) is replaced with compatibilizer 2 (E515) in equal amounts; the specific formulation and dosage are shown in Table 2, and the preparation method is the same as in Example 2.

[0056] Comparative Example 6 This comparative example provides a resin alloy material, which differs from Example 3 in that compatibilizer 2 (E515) is replaced by compatibilizer 3 (W1) in equal amounts; the specific formulation and dosage are shown in Table 2, and the preparation method is the same as in Example 3.

[0057] Comparative Example 7 This comparative example provides a resin alloy material, which differs from Example 4 in that: the two compatibilizers are replaced with PET resin 1 in equal amounts; the specific formulation and dosage are shown in Table 2, and the preparation method is the same as in Example 4.

[0058] Comparative Example 8 This comparative example provides a resin alloy material, which differs from Example 3 in that the amounts of compatibilizer 1 and compatibilizer 2 are adjusted; the specific formulation amounts are shown in Table 2, and the preparation method is the same as in Example 3.

[0059] Comparative Example 9 This comparative example provides a resin alloy material, which differs from Example 1 in that filler 1 (calcium carbonate) is replaced by an equal amount of filler 3 (talc); the specific formulation and dosage are shown in Table 2, and the preparation method is the same as in Example 1.

[0060] Comparative Example 10 A material made solely from PET resin 1.

[0061] Comparative Example 11 A material made solely from PP resin 1.

[0062] Table 2 Formulation table (parts by mass) of resin alloy materials for comparative examples 1-10

[0063] Result detection The materials obtained in Examples 1-5 and Comparative Examples 1-11 were injection molded using a horizontal injection molding machine to obtain samples. The injection molding conditions were as follows: the injection temperatures at the four stages from the feed port to the nozzle were 195℃, 200℃, 200℃, and 195℃ respectively; the injection pressure was 65MPa, the holding time was 8s, and the cooling time was 12s. The specifications of the samples were determined according to the specifications required for testing. The obtained samples were used for performance testing, and the testing methods are as follows: Density: Tested according to ASTM D792-20 standard, at room temperature 23℃; Tensile strength and elongation at break: tested according to ASTM D638-2010 standard, with a sample thickness of 3.0 mm; Bending performance was tested according to ASTM D790-2017 standard, with a sample thickness of 3.0 mm; Notched impact strength of cantilever beam: Tested according to ASTM D256-2010 standard, with a specimen thickness of 3.0 mm; Heat distortion temperature: Tested according to ASTM D648-2010 standard, with a sample thickness of 6.0 mm; Shrinkage rate: For injection molded square plates (150mm*150mm*3.0mm), the width of the square plates is tested after cooling, and the shrinkage rate is calculated based on the width difference.

[0064] Bending performance test: The bending resistance and toughness of the tensile specimen are evaluated by repeated bending.

[0065] The test results are shown in Tables 3-11.

[0066] Table 3 Performance test results of resin alloy materials in Examples 1-5

[0067] As shown in Table 3, the injection-molded parts made of the resin alloy materials obtained in Examples 1-5 of this invention have an elongation at break of no less than 80%, a notched cantilever beam impact strength of no less than 100 J / m, a shrinkage rate significantly lower than that of PP resin, and tensile strength and flexural strength significantly higher than those of PP resin. Therefore, the resin alloy material of this invention not only possesses high mechanical strength, good rigidity and toughness, but also solves the compatibility problem between PET and PP, preventing delamination in the parts. It exhibits advantages such as balanced rigidity and toughness, and low shrinkage, making it suitable for use in the manufacture of household appliances.

[0068] Table 4. Performance test results of resin alloy materials in Example 1 and Comparative Example 1

[0069] As can be seen from Table 4, compared with Example 1, PET resin was replaced in Comparative Example 1. Because PET resin 2 has a higher melting point, it is difficult to process during extrusion granulation. There is a processing temperature difference with PP resin, resulting in poor plasticization of PET resin 2, which leads to poor compatibility and high brittleness.

[0070] Table 5. Performance test results of resin alloy materials in Examples 2 and Comparative Examples 4-5

[0071] As can be seen from Table 5, compared with Example 2, Comparative Examples 4 and 5 replaced one of the compatibilizer components, that is, only one compatibilizer was used. The mechanical properties of the resulting resin alloy materials decreased significantly. This shows that the use of two compatibilizers in the present invention helps to synergistically improve the comprehensive performance of the resin alloy materials.

[0072] Table 6 Performance test results of the resin alloy materials of Examples 3 and Comparative Examples 2-3

[0073] As can be seen from Table 6, compared with Example 3, Comparative Example 2 used PP resin with a cantilever beam notched impact strength of less than 400 J / m. Although the rigidity of the resin alloy material increased, the toughness decreased significantly, and a balance between rigidity and toughness could not be achieved. Comparative Example 3 used PP resin with a low melt index. Although the various physical properties were not significantly different from those of Example 3, the fluidity decreased, which affected the processing of subsequent products.

[0074] Table 7 Performance test results of the resin alloy materials of Example 3 and Comparative Example 6

[0075] As can be seen from Table 7, compared with Example 3, the compatibilizer type was changed in Comparative Example 6. POE grafted with maleic anhydride was used instead of POE grafted with GMA. The compatibilizer lacked the epoxy groups provided by GMA, which could not solve the compatibility problem between PP and PET well, resulting in a decrease in toughness.

[0076] Table 8 Performance test results of the resin alloy materials of Example 4 and Comparative Example 7

[0077] As can be seen from Table 8, compared with Example 4, Comparative Example 7 did not add a compatibilizer. Due to the lack of the intermediate bridging effect of the compatibilizer, the compatibility of the resin alloy material was very poor, resulting in delamination and high brittleness of the prepared sample.

[0078] Table 9 Performance test results of the resin alloy materials of Example 3 and Comparative Example 7

[0079] As can be seen from Table 9, compared with Example 3, the proportion of compatibilizer in Comparative Example 8 was adjusted, and the proportion of PP grafted maleic anhydride in the two compatibilizers was increased. Although the strength of the resin alloy material was improved, the elongation at break and impact strength were significantly reduced, and the toughness was reduced. It was impossible to achieve both high rigidity and high toughness.

[0080] Table 10 Performance test results of the resin alloy materials of Example 1 and Comparative Example 9

[0081] As shown in Table 10, compared with Example 1, replacing the filler calcium carbonate with talc in Comparative Example 8 resulted in a significant decrease in both impact strength and elongation at break. The prepared specimens were also more prone to breakage, indicating reduced toughness. This demonstrates that the present invention, through the selection of a preferred filler, can improve the toughness of resin alloy materials.

[0082] Table 11 Performance test results of resin alloy materials in Examples 1-4 and Comparative Examples 10-11

[0083] As can be seen from Table 11, compared with Comparative Examples 10-11, Examples 1-4 exhibit high rigidity and high toughness, achieving a balance between rigidity and toughness, and their shrinkage rate is significantly lower than that of PP resin. It is evident that the resin alloy adjustment of the present invention, through specific formulation and component parameter adjustments, solves the compatibility problem between PET and PP resins, resulting in an alloy material with high rigidity, high toughness, and low shrinkage rate.

[0084] In summary, the resin alloy material of the present invention, through the compounding of specific components, reduces shrinkage while ensuring the mechanical strength of the resin alloy material, and solves the compatibility problem of PET and PP, achieving a balance between rigidity and toughness. The parts made from the resin alloy material are not easy to break and have high strength, making them suitable for the field of home appliances, especially for the manufacture of home appliance shells.

[0085] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A resin alloy material, characterized in that, The resin alloy material comprises PET resin, PP resin, and a compatibilizer; The melting point of the PET resin is ≤200℃; the notched cantilever impact strength of the PP resin is ≥400J / m; The compatibilizer includes at least two of the following: PP grafted with maleic anhydride, POE grafted with maleic anhydride, POE grafted with GMA, and SEBS grafted with maleic anhydride.

2. The resin alloy material according to claim 1, characterized in that, The resin alloy material comprises the following components by mass parts: 20-70 parts PET resin, 20-70 parts PP resin, 2-8 parts compatibilizer, 0-20 parts filler, 0-1 part lubricant, and 0-0.5 parts antioxidant.

3. The resin alloy material according to claim 1 or 2, characterized in that, The compatibilizer is a mixture of PP grafted with maleic anhydride and POE grafted with GMA; preferably, the mass ratio of the PP grafted with maleic anhydride to the PP grafted with GMA is 1:(1~2).

4. The resin alloy material according to claim 3, characterized in that, The grafting rates of the PP grafted with maleic anhydride and the POE grafted with GMA are independently selected from any value of ≥0.8%.

5. The resin alloy material according to claim 2, characterized in that, The filler includes at least one of calcium carbonate, barium sulfate, and wollastonite; And / or, the average particle size of the filler is 0.1~10 μm; And / or, the whiteness of the filler is ≥95%.

6. The resin alloy material according to claim 1 or 2, characterized in that, The melting point of the PET resin is 160~200℃; And / or, the intrinsic viscosity of the PET resin at room temperature is 0.6~0.8 dl / g.

7. The resin alloy material according to claim 1 or 2, characterized in that, The melt flow index of the PP resin at 230℃ and 2.16kg load is 5~35g / 10min.

8. A method for preparing a resin alloy material as described in any one of claims 1 to 7, characterized in that, The preparation method includes the following steps: The resin alloy material is obtained by mixing, melting, and extruding the components of the resin alloy material.

9. The method for preparing the resin alloy material according to claim 8, characterized in that, The extrusion temperature is 180~220℃.

10. The application of the resin alloy material according to any one of claims 1 to 7 in the manufacture of household appliances.

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