Polyolefin plastic material with spraying-free flow line effect and preparation method of polyolefin plastic material

Abstract

The invention discloses a polyolefin plastic material with a spraying-free flow line effect and a preparation method of the polyolefin plastic material. The preparation method comprises the following steps: (1) preparing color master batches with a flow line effect, wherein the materials comprise ethylene-vinyl alcohol copolymer resin (EVOH), a compatilizer, an antioxidant 1 #, an antioxidant 2 #, a lubricant, a weather-proof agent and a toner 1 #; (2) a polyolefin plastic base material with a spraying-free flow line effect, wherein the materials comprise polypropylene, polyethylene, a compatilizer, a flexibilizer, an antioxidant 1 #, an antioxidant 2 #, a lubricant, a weather-proof agent and a toner 2 #; and (3) adding one or more than one color master batch with the flow-line effect into the polyolefin plastic base material, and mechanically and uniformly mixing to obtain the spraying-free polyolefin plastic material with the flow-line effect. The obtained polyolefin plastic material can be prepared into a plastic product with a spraying-free flow line effect, which has mechanical properties and aesthetic property, through injection molding processing.

Description

Technical Field

[0001] The invention belongs to the field of spray-free plastics and relates to a polyolefin plastic material with a spray-free flow pattern effect and a preparation method thereof. Background Art

[0002] Polyolefins have high density, good chemical and water resistance, excellent mechanical strength, and electrical insulation. Furthermore, due to their abundant raw materials, low price, ease of processing, and excellent overall performance, they are currently the most produced and widely used polymer materials. Polyethylene and polypropylene are the most important.

[0003] Spray-free plastic is a kind of plastic product with aesthetic appearance that is made by one-time injection molding without spraying. Since no spraying is required, the production cycle is shortened, energy-saving and environmental protection are achieved, and costs are reduced. At the same time, the surface of the product can be given aesthetic appearance. With the development of spray-free materials, various differentiated appearance effects are presented. The spray-free flow effect has a changeable and unique appearance texture, which is used to simulate marble, wood grain, jade, water flow and other effects, which can present different appearance experiences. At present, the implementation of the flow effect is to add a masterbatch with a flow effect to the base material. The masterbatch with a flow effect is often made of crystalline polymers. During the injection molding process, the masterbatch with a flow effect naturally flows in the base material and is distributed on the surface of the product, but is not completely dispersed in the base material. Instead, it forms a streamlined shape to produce an appearance effect. Regarding the development of the flow effect of polyolefins, Chinese invention patent CN 112745665 A discloses a polypropylene material injection molding flow effect masterbatch and its preparation method. The flow effect masterbatch comprises PA6 resin; HDPE resin; a compatibilizer; a styrene-based elastomer; PP resin; a dispersant; an antioxidant; a pigment; and a filler. The main resin component is PA6 resin. This invention achieves the flow effect of polypropylene materials, but the compatibility between PA6 resin and PP is very poor. After injection molding into parts, PA6 disperses on the surface of the polypropylene resin, causing "peeling", which limits its application. Summary of the Invention

[0004] The purpose of the present invention is to address the problems in the prior art and provide a polyolefin plastic material with a spray-free flow effect and a preparation method thereof. In order to prevent the compatibility problem between the base material used in the flow masterbatch and the matrix itself, the present invention selects a material with good compatibility with polyolefin as the main component of the flow masterbatch, thereby solving the poor compatibility and giving the flow effect a more stable and natural appearance.

[0005] In existing technology, to prepare polyolefin materials (PP or PE) with a flow effect, polyamide 6 (PA6) is typically used as the base resin for the flow masterbatch (PA6 and colorant), which can achieve a good flow effect. However, PA6 has poor compatibility with polyolefins. During the injection molding process, PA6 disperses on the surface of the polyolefin material, resulting in "peeling" on the surface of the polyolefin part. To improve the compatibility of the flow masterbatch, a compatibilizer (POE-g-MAH, PP-g-MAH, PE-g-MAH, etc.) is added to the flow masterbatch or polyolefin material to enhance the compatibility of PA6 with the polyolefin material. However, the majority of the material in the flow masterbatch is PA6, and the addition of a small amount of compatibilizer cannot completely correct this defect. To further improve the effect, more compatibilizer is added. However, as the amount of compatibilizer increases, the flow performance and stability are affected.

[0006] To address this issue, the present invention considers using masterbatch base materials with a certain degree of compatibility with PP or PE. For example, when the polyolefin plastic base material is PE, using PP with a certain degree of compatibility as the masterbatch base material can reduce the "peeling" problem. However, this improved compatibility also deteriorates the flow effect, and the two cannot be achieved at the same time. The present invention has discovered that using ethylene-vinyl alcohol copolymer resin (EVOH) as a masterbatch base material to replace PA6 not only solves the "peeling" problem caused by compatibility with polyolefin materials, but also ensures the same flow effect as PA6 in PP or PE. Although the EVOH of the present invention has a certain degree of compatibility with PP or PE, it can solve the "peeling" problem by combining it with a compatibilizer. However, the flow effect is not deteriorated by increasing the compatibilizer dosage or improving the compatibility. In other words, it is less affected by the compatibilizer. At the same time, by limiting the ethylene / vinyl alcohol content in EVOH, it can produce a stable flow effect. The compatibilizer is primarily used to improve the compatibility of EVOH with the base material and reduce the impact of EVOH on the physical properties of the polyolefin plastic material.

[0007] The technical solutions of the present invention are as follows: The present invention provides a polyolefin plastic material with a spray-free flow effect, comprising a flow effect masterbatch and a polyolefin plastic base material; The flow effect masterbatch includes the following components in parts by weight: 100 parts of ethylene vinyl alcohol copolymer resin (EVOH); 2 to 10 parts of compatibilizer; 0.2-1 part of antioxidant; 0.3-1 part of lubricant; 0.3-1.2 parts of weathering agent; 1 to 3 parts of color powder 1#.

[0008] As an embodiment of the present invention, the addition amount of the flow effect masterbatch is 1% to 20% of the mass of the polyolefin plastic base material, preferably 3% to 8%.

[0009] In one embodiment of the present invention, the ethylene-vinyl alcohol copolymer resin (EVOH) has an ethylene content of 20% to 35% by mole and a vinyl alcohol content of 65% to 80% by mole. EVOH has a melting point of 170°C to 189°C. By limiting the ethylene / vinyl alcohol content in the EVOH, the present invention achieves a stable flow effect.

[0010] As an embodiment of the present invention, the compatibilizer is polypropylene or polyethylene grafted with maleic anhydride (MAH) and / or glycidyl methacrylate (GMA).

[0011] As an embodiment of the present invention, the antioxidant comprises 0.1-0.5 parts of antioxidant 1# and 0.1-0.5 parts of antioxidant 2#. Antioxidant 1# is antioxidant 1010 and / or antioxidant 1076; antioxidant 2# is antioxidant 168 and / or antioxidant 300.

[0012] As an embodiment of the present invention, the lubricant is one or more of stearate, polypropylene wax, ethylene bisstearamide, and silicone.

[0013] As an embodiment of the present invention, the toughening agent is a polyolefin toughening agent, such as one or more of EVA, POE, ethylene propylene rubber, and SEBS.

[0014] As an embodiment of the present invention, the weathering agent is a compound of a benzotriazole and a hindered amine weathering agent, wherein the mass ratio of the benzotriazole to the hindered amine weathering agent is 1:1.

[0015] As an embodiment of the present invention, the toner 1# is not limited to conventional pigments, but also includes effect powders such as metal, pearlescent, glass, and mica.

[0016] As one embodiment of the present invention, the polyolefin plastic base material comprises the following components in parts by weight: Polypropylene (PP) 0-100 parts Polyethylene (PE) 0-100 parts; 2 to 5 parts of compatibilizer; 2 to 15 parts of toughening agent; 0.2-0.6 parts of antioxidant; 0.3-3 parts of lubricant; 0.3-1.2 parts of weathering agent; Color powder 2# 0.1~1 part; The total mass fraction of polypropylene and polyethylene is 100 parts.

[0017] In polyolefin plastic base materials: The compatibilizer is polypropylene or polyethylene grafted with maleic anhydride (MAH) and / or glycidyl methacrylate (GMA); The toughening agent is a polyolefin toughening agent, such as one or more of EVA, POE, ethylene propylene rubber, and SEBS; The antioxidant includes 0.1 to 0.3 parts of antioxidant 1# and 0.1 to 0.3 parts of antioxidant 2#; antioxidant 1# is antioxidant 1010 and / or antioxidant 1076; antioxidant 2# is antioxidant 168 and / or antioxidant 300; The lubricant is one or more of stearate, polypropylene wax, ethylene bisstearamide, and silicone; The weathering agent is a compound of benzotriazole and hindered amine weathering agents. The mass ratio of benzotriazole and hindered amine weathering agents is 1:1; The color powder 2# is not limited to conventional pigments, but also includes metal, pearl, glass, mica and other effect powders.

[0018] The present invention also provides a method for preparing the polyolefin plastic material having the spray-free flow pattern effect, comprising the following steps: (1) Preparation of rhytm effect masterbatch Ethylene-vinyl alcohol copolymer resin (EVOH), compatibilizer, antioxidant 1#, antioxidant 2#, lubricant, weathering agent, and color powder 1# are mixed and then added to a twin-screw extruder. The temperatures of zones 1 to 5 of the twin-screw extruder are 160-180°C, 170-190°C, 180-200°C, 190-210°C, and 200-220°C, respectively. The twin-screw speed is 400-600 r / min. The mixture is melt-extruded and granulated to obtain a flow effect masterbatch for polyolefin plastic materials, which is set aside for use. (2) Preparation of polyolefin plastic base material The polyolefin, compatibilizer, toughening agent, antioxidant 1#, antioxidant 2#, lubricant, weathering agent and color powder 2# are mixed and then added into a twin-screw extruder. The temperatures of zones 1 to 5 of the twin-screw extruder are 140-160°C, 150-170°C, 160-180°C, 170-190°C and 180-200°C, respectively. The twin-screw speed is 400-600 r / min, and the polyolefin plastic base material is obtained by melt extrusion and granulation. (3) Preparation of spray-free flow effect polyolefin plastic materials One or more flow effect masterbatches are added to a polyolefin plastic base material and mechanically mixed to obtain a spray-free flow effect polyolefin plastic material.

[0019] Preparation of polyolefin plastic parts: Setting the injection molding temperature: The injection molding machine setting temperature is 140-170°C, 150-180°C, 160-190°C, 170-200°C. After the obtained spray-free flow pattern effect polyolefin plastic material is injection molded, a spray-free flow pattern effect polyolefin plastic part is obtained.

[0020] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects: In the past, crystalline materials PA6 or PBT were often used to achieve flow effects on polyolefins. However, the polarity of polyamide 6 (PA6) or polybutylene terephthalate (PBT) and polypropylene (PP) is very different, resulting in poor compatibility. During the injection molding process, polyamide 6 (PA6) or polybutylene terephthalate (PBT) is dispersed on the surface of polypropylene (PP), resulting in "peeling" on the surface of polypropylene (PP) parts, which cannot be used in practice. Ethylene-vinyl alcohol copolymer resin (EVOH) is a highly crystalline polymer with a polarity comparable to polypropylene (PP) and good compatibility. It can solve the problem of poor compatibility in previous patents, and there is no "peeling" on the surface of the injection-molded parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings: Figure 1 This is the appearance of the plastic sample obtained in Example 1 of the present invention; Figure 2 This is the appearance of the plastic sample obtained in Example 6 of the present invention; Figure 3 This is the appearance of the plastic sample obtained in Example 7 of the present invention; Figure 4 This is the appearance of the plastic sample obtained in Comparative Example 1 of the present invention; Figure 5 This is the appearance of the plastic sample obtained in Comparative Example 2 of the present invention; Figure 6 This is the appearance of the plastic sample obtained in Comparative Example 3 of the present invention; Figure 7 This is the appearance of the plastic sample obtained in Comparative Example 4 of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the examples. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that those skilled in the art may make several adjustments and improvements without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0023] The flow effect masterbatch and the polyolefin plastic base material used in the spray-free flow effect polyolefin plastic material in the embodiment of the present invention are prepared according to the following steps.

[0024] (1) Preparation of flow effect masterbatch: The composition of the flow effect masterbatch is shown in Table 1. Ethylene-vinyl alcohol copolymer resin (EVOH), compatibilizer, antioxidant 1#, antioxidant 2#, lubricant, weathering agent, and color powder 1# are mixed and added to a twin-screw extruder. The temperatures of zones 1 to 5 of the twin-screw extruder are 170°C, 180°C, 190°C, 200°C, and 210°C, respectively. The twin-screw speed is 500r / min, and the flow effect masterbatch for polyolefin plastic materials is obtained by melt extrusion and granulation, and is set aside.

[0025] Table 1 Ratio of flow effect masterbatch for spray-free flow effect polyolefin plastic material

[0026] The components of the rhyolite masterbatch in Table 1 are as follows: Ethylene-vinyl alcohol copolymer resin (EVOH), with a melting point of 178°C. The ethylene content (molar fraction) in EVOH is usually 30% and the vinyl alcohol content (molar fraction) is 70%; The compatibilizer is polypropylene grafted with maleic anhydride (MAH); Antioxidant 1# is antioxidant 1010; Antioxidant 2# is antioxidant 168; The lubricant is zinc stearate; The weathering agent is a combination of UVP and hindered amine (mass ratio 1:1); The toner 1# is titanium dioxide.

[0027] (2) Preparation of polyolefin plastic base material: The composition of the polyolefin plastic base material is shown in Table 2. Polyolefin, compatibilizer, toughening agent, antioxidant 1#, antioxidant 2#, lubricant, weathering agent, and color powder 2# are mixed and added into a twin-screw extruder. The twin-screw speed is 500 r / min and the melt extrusion granulation is carried out to obtain a polypropylene plastic base material with a spray-free flow pattern effect.

[0028] When the polyolefin is polypropylene, the temperatures of zones 1 to 5 of the twin-screw extruder are 160°C, 170°C, 180°C, 190°C, and 200°C, respectively; When the polyolefin is polyethylene, the temperatures of zones 1 to 5 of the twin-screw extruder are 140°C, 150°C, 160°C, 170°C, and 180°C, respectively; When the polyolefin is polypropylene and polyethylene, the temperatures of zones 1 to 5 of the twin-screw extruder are 150°C, 160°C, 170°C, 180°C, and 190°C, respectively; Table 2 A spray-free flow effect polyolefin plastic material Polyolefin plastic base material ratio

[0029] The components of the polyolefin plastic base material in Table 2 are as follows: The polypropylene (PP) resin is copolymerized PP, and its melt index is 12 g / 10 min when tested at 230°C and 2.16 kg. The polyethylene (PE) resin is high-density polyethylene, and its melt index is 5g / 10min when tested under the conditions of 190℃*2.16kg; The compatibilizer is polypropylene grafted maleic anhydride (MAH); The toughening agent is POE; Antioxidant 1# is antioxidant 1010; Antioxidant 2# is antioxidant 168; The lubricant is zinc stearate; The weathering agent is a combination of UVP and hindered amine (mass ratio is 1:1); Toner 2# is carbon black.

[0030] Examples 1-18 This embodiment provides a spray-free flow effect polyolefin plastic material and a preparation method thereof. The compositions of the flow effect masterbatch and the polyolefin plastic base material used are shown in Table 3.

[0031] Preparation method: Add 5wt% of flow effect masterbatch into the polyolefin plastic base material and mix mechanically to obtain a spray-free flow effect polypropylene plastic material.

[0032] Table 3 Composition of a polyolefin plastic material with a spray-free flow effect

[0033] Example 19 The difference from Example 6 is that the rhyolite masterbatch in Table 1, ethylene-vinyl alcohol copolymer resin (EVOH), has a melting point of 178°C, and the ethylene content (molar fraction) in EVOH is generally 42%, and the vinyl alcohol content is 58%; Example 20 The difference from Example 6 is that the compatibilizer for the rhytide effect masterbatch in Table 1 is polypropylene grafted glycidyl methacrylate (GMA); Example 20 The difference from Example 6 is that in the flow effect masterbatch in Table 1, antioxidant 1# is antioxidant 1076, and antioxidant 2# is antioxidant 300, and the mass ratio thereof is 1:1.

[0034] Example 21 The difference from Example 6 is that the lubricant for the rhytide effect masterbatch in Table 1 is polypropylene wax.

[0035] Example 22 The difference from Example 6 is that the lubricant for the rhytide effect masterbatch in Table 1 is ethylene bisstearamide.

[0036] Example 23 The difference from Example 6 is that the lubricant for the rhytide effect masterbatch in Table 1 is a silicone.

[0037] Example 24 The difference from Example 6 is that the lubricant of the rhytide effect masterbatch in Table 1 is a compound of zinc stearate and silicone, and the mass ratio thereof is 1:1.

[0038] Example 25 The difference from Example 6 is that the polyolefin plastic base material in Table 2, the polypropylene (PP) resin is copolymerized PP, and its melt index tested under the conditions of 230°C*2.16kg is 17g / 10min.

[0039] Example 26 The difference from Example 6 is that the polyolefin plastic base material in Table 2, the polyethylene (PE) resin is high-density polyethylene, and its melt index tested under the conditions of 190°C*2.16kg is 10g / 10min.

[0040] Example 27 The difference from Example 6 is that the compatibilizer for the polyolefin plastic base material in Table 2 is polypropylene grafted glycidyl methacrylate (GMA).

[0041] Example 28 The difference from Example 6 is that the polyolefin plastic base material in Table 2 is EVA as the toughening agent.

[0042] Example 29 The difference from Example 6 is that the polyolefin plastic base material in Table 2 is ethylene propylene rubber as the toughening agent.

[0043] Example 30 The difference from Example 6 is that the polyolefin plastic base material in Table 2 is SEBS as the toughening agent.

[0044] Example 31 The difference from Example 6 is that the polyolefin plastic base material in Table 2 and the toughening agent are EVA and SEBS, and the mass ratio thereof is 1:1.

[0045] Example 32 The difference from Example 6 is that in the polyolefin plastic base material in Table 2, antioxidant 1# is antioxidant 1076, and antioxidant 2# is antioxidant 300, and the mass fraction thereof is 1:1.

[0046] Example 33 The difference from Example 6 is that the polyolefin plastic base material in Table 2 is polypropylene wax as the lubricant.

[0047] Example 34 The difference from Example 6 is that the polyolefin plastic base material in Table 2 is ethylene bisstearamide as the lubricant.

[0048] Example 35 The difference from Example 6 is that the polyolefin plastic base material in Table 2 is a type of silicone lubricant.

[0049] Example 36 The difference from Example 6 is that the polyolefin plastic base material in Table 2 and the lubricant are a compound of zinc stearate and silicone, and the mass ratio thereof is 1:1.

[0050] Example 37 The difference from Example 6 is that the polyolefin plastic base material in Table 2 and the lubricant are a compound of zinc stearate and silicone, and the mass ratio thereof is 1:1.

[0051] Comparative Example 1 The difference between Comparative Example 1 and Example 6 is that Example 1 in patent CN 112745665 A is used: 48 parts of PA6 resin, 10 parts of HDPE resin, 4 parts of compatibilizer POE-g-MAH, 4 parts of styrene elastomer, 5 parts of polypropylene resin, 2 parts of dispersant, 7 parts of pigment, and 10 parts of wollastonite filler, and the flow effect masterbatch is prepared according to the process and method of Example 1.

[0052] Comparative Example 2 Comparative Example 2 differs from Example 6 in that the ethylene-vinyl alcohol copolymer resin (EVOH) is replaced with an equal amount of polypropylene resin.

[0053] Comparative Example 3 Comparative Example 3 differs from Example 6 in that the ethylene-vinyl alcohol copolymer resin (EVOH) is replaced with an equal amount of polyethylene resin.

[0054] Comparative Example 4 The difference between Comparative Example 4 and Example 6 is that the molar percentage of ethylene in the ethylene-vinyl alcohol copolymer resin (EVOH) is 45%, and the molar percentage of vinyl alcohol is 55%.

[0055] The polyolefin plastic materials of the embodiment and the comparative example are prepared into polyolefin plastic parts: the injection molding temperature is set, and a polypropylene plastic sample with a spray-free flow pattern effect is obtained after injection molding.

[0056] When the polyolefin is polypropylene, set the injection molding machine temperature to 170℃, 180℃, 190℃, and 200℃; When the polyolefin is polyethylene, set the injection molding machine temperature to 140℃, 150℃, 160℃, and 170℃; When the polyolefin is polypropylene and polyethylene, the injection molding machine temperature is set to 150℃, 160℃, 170℃, and 180℃.

[0057] The performance of the two processing temperatures of the above examples and comparative examples were evaluated and compared through three dimensions of appearance inspection: "unmelted masterbatch, completely melted masterbatch immersed in substrate, and flow effect", as shown in Table 4: Table 4 Flow effect

[0058] The plastic sample obtained in Example 1 is as follows Figure 1 As shown, the plastic sample obtained in Example 6 is as follows Figure 2 As shown, the plastic sample obtained in Example 7 is as follows Figure 3 As shown in the figure, although the amount of compatibilizer increases, the three samples have good mechanical properties, good flow effect and no peeling.

[0059] The plastic sample obtained in Comparative Example 1 is as follows Figure 4 As shown, peeling occurs.

[0060] The plastic samples obtained in Comparative Examples 2-4 are as follows Figure 5-7 As shown, there is no flow effect.

[0061] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A polyolefin plastic material with a spray-free flow effect, characterized in that: Including flow effect masterbatch and polyolefin plastic base material; The addition amount of flow effect masterbatch is 1% to 20% of the mass of polyolefin plastic base material; The flow effect masterbatch includes the following components in parts by weight: 100 parts of ethylene-vinyl alcohol copolymer resin; 2 to 10 parts of compatibilizer; 0.2-1 part of antioxidant; 0.3-1 part of lubricant; 0.3-1.2 parts of weathering agent; 1 to 3 parts of color powder 1#.

2. The polyolefin plastic material with spray-free flow effect according to claim 1, characterized in that: In the ethylene-vinyl alcohol copolymer resin, the molar percentage of ethylene is 20% to 35%, and the molar percentage of vinyl alcohol is 65% to 80%.

3. The polyolefin plastic material with spray-free flow effect according to claim 1, characterized in that: The compatibilizer is one or more of polypropylene grafted maleic anhydride, polypropylene grafted glycidyl methacrylate, polyethylene grafted maleic anhydride, and polyethylene grafted glycidyl methacrylate.

4. The polyolefin plastic material with spray-free flow effect according to claim 1, characterized in that: The antioxidant includes 0.1 to 0.5 parts of antioxidant 1# and 0.1 to 0.5 parts of antioxidant 2#; Antioxidant 1# is antioxidant 1010 and / or antioxidant 1076; Antioxidant 2# is antioxidant 168 and / or antioxidant 300.

5. The polyolefin plastic material with spray-free flow effect according to claim 1, characterized in that: The lubricant is one or more of stearate, polypropylene wax, ethylene bisstearamide and silicone.

6. The polyolefin plastic material with spray-free flow effect according to claim 1, characterized in that: The toughening agent is a polyolefin toughening agent; the polyolefin toughening agent includes one or more of EVA, POE, ethylene propylene rubber, and SEBS.

7. The polyolefin plastic material with spray-free flow effect according to claim 1, characterized in that: The weathering agent is a compound of benzotriazole and hindered amine weathering agents.

8. The polyolefin plastic material with spray-free flow effect according to claim 1, characterized in that: The color powder 1# includes one or more of pigment and effect powder.

9. The polyolefin plastic material with spray-free flow effect according to claim 1, characterized in that: The polyolefin plastic base material comprises the following components in parts by weight: Polypropylene 0-100 parts Polyethylene 0-100 parts; 2 to 5 parts of compatibilizer; 2 to 15 parts of toughening agent; 0.2-0.6 parts of antioxidant; 0.3-3 parts of lubricant; 0.3-1.2 parts of weathering agent; Color powder 2# 0.1~1 part; In the polyolefin plastic base material, the total mass parts of polypropylene and polyethylene is 100 parts.

10. A method for preparing a polyolefin plastic material according to claim 1, characterized in that: The steps include: (1) Preparation of rhytm effect masterbatch Ethylene-vinyl alcohol copolymer resin, compatibilizer, antioxidant 1#, antioxidant 2#, lubricant, weathering agent, and color powder 1# are mixed and then added into a twin-screw extruder. The temperatures of zones 1 to 5 of the twin-screw extruder are 160-180°C, 170-190°C, 180-200°C, 190-210°C, and 200-220°C, respectively. The twin-screw speed is 400-600 r / min. The mixture is melt-extruded and granulated to obtain a flow effect masterbatch for polyolefin plastic materials, which is set aside for use. (2) Preparation of polyolefin plastic base material The polyolefin, compatibilizer, toughening agent, antioxidant 1#, antioxidant 2#, lubricant, weathering agent and color powder 2# are mixed and then added into a twin-screw extruder. The temperatures of zones 1 to 5 of the twin-screw extruder are 140-160°C, 150-170°C, 160-180°C, 170-190°C and 180-200°C, respectively. The twin-screw speed is 400-600 r / min, and the polyolefin plastic base material is obtained by melt extrusion and granulation. (3) Preparation of spray-free flow effect polyolefin plastic materials One or more flow effect masterbatches are added to a polyolefin plastic base material and mechanically mixed to obtain a spray-free flow effect polyolefin plastic material.

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