Metallic-color high-shading PP (polypropylene) material as well as preparation method and application thereof

Abstract

The invention provides a metallic high-shading PP (polypropylene) material as well as a preparation method and application thereof, and the metallic high-shading PP material comprises the following components in parts by weight: 0-100 parts of homopolymerized PP resin, 0-100 parts of copolymerized PP resin, 1-5 parts of an opacifier, 0.2-1.5 parts of a weather-proof agent and 0.2-0.6 part of an antioxidant, the opacifying agent comprises the following components in parts by weight: 50-80 parts of metal powder, 10-30 parts of a metal powder modifier and 10-20 parts of a lubricant. The opacifying agent used in the invention comprises the metal powder and the metal powder modifier, and the metal powder modifier can pretreat the metal powder, so that agglomerates generated by local agglomeration of metal powder particles are dissociated, an electrostatic stabilization effect and a steric hindrance stabilization effect are formed, and the metal particles are uniformly distributed in a substrate and float on the surface to effectively form a mirror reflection layer; the glossiness and the lightness are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of PP material modification, and in particular to a metal color high-shading PP material and a preparation method and application thereof. BACKGROUND

[0002] PP (polypropylene) is a lightweight, chemical corrosion resistant and low cost thermoplastic, widely used in daily necessities, packaging, automotive parts and medical supplies and other fields. The commonly used shading material is mainly shading PP, followed by shading ABS, shading ASA, shading PPABS and other materials, which can be applied to camera shading cover, light shield, display frame and other parts, such as using PP for shading modification, which has cost advantage, and can replace other shading materials when the physical performance requirement of the part is not high, which has good application prospect.

[0003] The traditional shading PP material uses a large amount of carbon black or titanium dioxide for filling, and can only be made into black or white parts, which is monotonous in color. Under the market demand of product color diversity, some people try to introduce silica, mica powder and titanium dioxide as shading agents in the spray-free PP material, but ignore the antagonistic effect of these components on the aluminum powder used in the spray-free PP.

[0004] In the spray-free material, the aluminum powder has high reflection characteristics, and when it is uniformly distributed on the surface of the material, it can form a smooth reflective layer, and through mirror reflection, the surface of the part shows high brightness (L value) and high gloss, and has a metallic texture. The introduction of silica, mica powder, calcium carbonate and talc powder will make the surface of the material rough and the glossiness decrease. Titanium dioxide is a white pigment, and the addition of titanium dioxide in the spray-free material will directly cover the mirror reflection surface formed by the aluminum powder on the surface of the material, reduce the mirror reflection, and make the surface of the part mainly diffuse reflection. Although the glossiness does not decrease significantly, the material loses the metallic texture and has a strong plastic feel. In addition, the aluminum powder has stronger hiding power than titanium dioxide, and the aluminum powder that does not reflect light shows gray tone, which makes the L value of the material significantly lower than that of the single use of aluminum powder and titanium dioxide, and there is an antagonistic effect.

[0005] CN107759898B discloses a high-shading polypropylene composite material and a preparation method thereof. The invention proposes to use mica powder and titanium dioxide as shading agents to prepare a shading PP material, but the product can only be white, which greatly limits the diversity of product appearance color. And because a part of mica powder is used, compared with pure titanium dioxide shading, the invention has low cost, but the shading effect is not as good. SUMMARY

[0006] To overcome the problems in the related art, one of the purposes of the present application is to provide a metal color high-shading PP material, the shading agent additive amount of which is below 5wt%, which can meet the requirement of not higher than 0.01% of light transmittance at 1mm thickness, and ensure that the physical performance retention of the PP material is excellent.

[0007] A metal color high-shading PP material comprises the following components in parts by weight: homopolymer PP resin 0-100 parts, copolymer PP resin 0-100 parts, shading agent 1-5 parts, weathering agent 0.2-1.5 parts, antioxidant 0.2-0.6 parts.

[0008] The shading agent comprises the following components in parts by weight: metal powder 50-80 parts, metal powder modifier 10-30 parts, lubricant 10-20 parts.

[0009] In the preferable technical solution of the present application, the metal powder is aluminum powder.

[0010] In the preferable technical solution of the present application, the metal powder modifier is at least one of alkyl ammonium salt, alkyl phosphonium salt and alkyl sulfonium salt.

[0011] In the preferable technical solution of the present application, the lubricant is at least one of ethylene bis-stearamide, pentaerythritol stearate, oleic acid amide, erucic acid amide, magnesium stearate and calcium stearate.

[0012] In the preferable technical solution of the present application, the weathering agent comprises at least one of light stabilizer and ultraviolet light absorber.

[0013] In the preferable technical solution of the present application, the metal color high-shading PP material further comprises color powder 0.2-0.5 parts.

[0014] In the preferable technical solution of the present application, the melt index of the homopolymer PP resin is between 10-150g / 10min, and the melt index of the copolymer PP resin is between 2-40g / 10min.

[0015] The second purpose of the present application is to provide a preparation method of a metal color high-shading PP material, which is used for preparing the metal color high-shading PP material as described above, and comprises the following steps:

[0016] The metal powder, metal powder modifier and lubricant are weighed according to the parts by weight, and are mixed uniformly to form a shading agent;

[0017] The homopolymer PP resin and / or copolymer PP resin, shading agent, weathering agent and antioxidant are weighed according to the parts by weight, and are mixed uniformly;

[0018] The uniformly mixed components are put into an extruder for sufficient melt blending, and the metal color high-shading PP material is obtained after extrusion, cooling and granulation.

[0019] In the preferable technical solution of the present application, the extruder is a double screw extruder, and when the metal color high light shielding PP material is prepared, the processing temperature of the double screw extruder is as follows: the temperature of the first zone is 180°C, the temperature of the second zone is 200°C, the temperature of the third zone is 200°C, the temperature of the fourth zone is 200°C, the temperature of the fifth zone is 190°C, the temperature of the sixth zone is 195°C, the temperature of the seventh zone is 200°C, the temperature of the eighth zone is 200°C, and the temperature of the die head is 200°C.

[0020] The third object of the present application is to provide an application of the metal color high light shielding PP material, and the metal color high light shielding PP material is used in the field of LED lighting.

[0021] The present application has the following advantages:

[0022] The metal color high light shielding PP material provided by the present application contains metal powder and metal powder modifier in the light shielding agent, the metal powder modifier can pretreat the metal powder, dissociate the agglomerates generated by the partial agglomeration of the metal powder particles, form electrostatic stabilization and steric hindrance stabilization, make the metal particles uniformly distributed in the base material and float on the surface, effectively form a mirror surface reflection layer, and improve the gloss and brightness. In the present application, the addition amount of the light shielding agent is less than 5wt%, which can meet the requirement of not more than 0.01% of the light transmittance under the thickness of 1mm, and ensure that the physical performance retention rate of the PP material is excellent.

[0023] The preparation method of the metal color high light shielding PP material provided by the present application is simple and efficient, and the metal color high light shielding PP material is obtained after the extruder is fully melt blended, extruded, cooled and granulated.

[0024] The metal color high light shielding PP material provided by the present application can be used in the field of LED lighting. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The flowchart for preparing the light shielding agent in the embodiment of the present application is shown;

[0026] Figure 2 The flowchart for preparing the metal color high light shielding PP material in the embodiment of the present application is shown. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0028] The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the description of the present application and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It also will be understood that the term "and / or," as used herein, refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0029] It should be understood that although the terms "first", "second", "third" and the like can be used herein to describe various information, these terms are not intended to denote a limitation, but are used only to distinguish one piece of information from another. For example, a first piece of information can also be referred to as a second piece of information, and similarly, a second piece of information can also be referred to as a first piece of information without departing from the scope of the present application. Thus, features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0030] The shading materials in the prior art can only be black and white, which cannot meet the demand for color diversity. When the product needs to achieve a very high shading, the addition amount of carbon black is not less than 5%, and the addition amount of titanium dioxide is not less than 12%. The addition of too much filler will reduce the physical properties of the material.

[0031] The present application is different from the existing shading PP material, and creatively selects to use metal powder, metal powder modifier and lubricant to prepare a shading agent, and a small amount of addition achieves a high shading effect. The shading agent used in the present application contains a metal powder modifier, which can pretreat the metal powder, dissociate the agglomerates generated by the local agglomeration of metal powder particles, form electrostatic stabilization and steric hindrance stabilization, make the metal particles uniformly distributed in the base material, float on the surface, effectively form a mirror surface reflection layer, and improve the gloss and brightness.

[0032] Meanwhile, the metal color shading PP material of the present application can be adjusted to various metal colors by adding different color powders, can meet the market demand for color diversity of appearance, and can achieve a metal texture effect, improve the product appearance and taste, and has high practicality and obvious cost advantage, and the process flow is simple.

[0033] The metal color high shading PP material provided by the present application comprises the following components in parts by weight: homopolymer PP resin 0-100 parts, copolymer PP resin 0-100 parts, shading agent 1-5 parts, weathering agent 0.2-1.5 parts, and antioxidant 0.2-0.6 parts.

[0034] The light-blocking agent comprises the following components in parts by weight: 50-80 parts of metal powder, 10-30 parts of metal powder modifier, and 10-20 parts of lubricant.

[0035] Specifically, the metallic powder in this application can be aluminum powder. The metallic powder provides light-blocking properties to the PP material, giving it a metallic appearance, and various metallic colors can be changed by adding color powder.

[0036] Metal powder modifiers are used to treat metal powders, causing the agglomerates formed between particles to disintegrate, creating electrostatic steric stabilization, promoting dispersion and maintaining stability, and making the metal powder particles more easily and neatly float on the material surface, thus improving light-blocking efficiency. Metal powder modifiers are at least one of alkylammonium salts, alkylphosphonium salts, and alkylsulfonium salts. Examples of alkylammonium salts include at least one of hexadecyltrimethylammonium bromide (CTAB), octadecyltrimethylammonium chloride (STAC), and dioctadecyldimethylammonium chloride (DODMAC). Examples of alkylphosphonium salts include tetradecyltributylphosphonium bromide. Among these, alkylphosphonium salts and alkylsulfonium salts, in addition to providing electrostatic steric stabilization for metal particles, also exhibit better heat resistance and can be used as antistatic agents in PP materials.

[0037] When the metal powder is aluminum powder, the metal powder modifier can pretreat the aluminum powder, causing the agglomerates formed by the local aggregation of aluminum powder particles to dissociate, forming electrostatic stabilization and steric stabilization effects, so that the aluminum powder particles are evenly distributed in the substrate, effectively avoiding local light leakage in the final product, and indirectly reducing the amount of aluminum powder used.

[0038] The lubricant is used to ensure internal and external lubrication during the preparation of the opacifier and subsequent twin-screw extrusion granulation. The lubricant is at least one of ethylene bis-stearamide, pentaerythritol stearate, oleamide, erucamide, magnesium stearate, and calcium stearate.

[0039] Homopolymer PP resin has high strength and good flowability, but low toughness, while copolymer PP resin has very high toughness. The material properties can be comprehensively adjusted by changing the addition ratio. The melt index of homopolymer PP resin is between 10-150 g / 10 min, while that of copolymer PP resin is between 2-40 g / 10 min.

[0040] The opacifier provides high opacity to the material, and its high dispersibility can prevent local light leakage in the final product, ensuring stable opacity performance of the product with low addition amount.

[0041] The function of weathering agents is to ensure the long-term aging resistance of materials, ensuring that they retain their original color and do not yellow after many years of use. Weathering agents are at least one of light stabilizers 770 and 944 and ultraviolet absorbers UV-P, UV-234, and UV-360, preferably a combination of 770 and UV-P.

[0042] Antioxidants are used to resist aging during processing. The primary antioxidant binds to reactive free radicals generated during processing to form hydroperoxides, while the secondary antioxidant promotes the decomposition of hydroperoxides. The resulting small molecules are then removed by a vacuum pump. The antioxidant is at least one of 1010 and 168.

[0043] Pigments are used to adjust the final desired color appearance. Pigments are at least one of the common pigments such as 179 Red, Iron Red, Titanium Yellow, TS Yellow, 3G Orange, Ultramarine, Ultraviolet, 511A, 2B Blue, and Carbon Black.

[0044] like Figure 2 The method for preparing a metallic high-opacity PP material provided in this application includes:

[0045] S1: Weigh out homopolymer PP resin and / or copolymer PP resin, opacifier, weathering agent, antioxidant, and colorant according to the actual situation to form composition B.

[0046] Among them, such as Figure 1 As shown, the preparation method of the light-blocking agent includes:

[0047] S11: Weigh out the metal powder, metal powder modifier, and lubricant according to the weight parts to form composition A;

[0048] S12: Add composition A to a grinder and mix at high speed for 4 minutes;

[0049] S13: Pour out the treated composition A and use it as a light-blocking agent.

[0050] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0051] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0052] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare metallic high-opacity PP material particles, which can be used for injection molding into products.

[0053] The metallic high-light-shielding PP material provided in this application can be used in the field of LED lighting, specifically in components such as camera lens hoods, light shields, and monitor bezels.

[0054] The present application will be further explained and illustrated through the following embodiments, in which the materials are selected as follows:

[0055] The metal powder is aluminum strips (products containing 80% aluminum powder, the remainder being waxes and compatibilizers), purchased from Zhuhai Aika Special Pigments Co., Ltd., with at least one of the following grades: 09-20B, 12-20B, 15-20B, 19-20B, and 23-10B.

[0056] It should be noted that the first two digits of the aluminum powder grade represent the D50 particle size, the two digits after the "-" represent the carrier content, and "B" indicates that the product shape is strip.

[0057] The metal powder modifier was purchased from Sichuan Ruikaibang Chemical Co., Ltd., and is at least one of hexadecyltrimethylammonium bromide (CTAB), octadecyltrimethylammonium chloride (STAC), and dioctadecyldimethylammonium chloride (DODMAC).

[0058] The lubricant is at least one selected from ethylene bis-stearamide, pentaerythritol stearate, oleamide, erucamide, magnesium stearate, and calcium stearate. More preferably, the present invention uses pentaerythritol stearate, abbreviated as PETS. The selected PETS is preferably sourced from Lonza Corporation, USA, under the brand name LONZA.

[0059]

[0060] The melt index of homopolymer PP resin is between 10-150 g / 10 min, preferably from Formosa Plastics in Taiwan, with the grade PP-1124.

[0061] The melt flow index of the copolymer PP resin is between 2 and 40 g / 10 min. It is preferably sourced from Thai petrochemicals, with the grade PP-2500.

[0062] The opaque agent is prepared by the above-described method.

[0063] The weathering agent is at least one of light stabilizers 770 and 944 and ultraviolet absorbers UV-P, UV-234, and UV-360, preferably a combination of 770 and UV-P. All selected weathering agents were purchased from Tianjin Lianlong.

[0064] The antioxidants are at least one of 1010 and 168, both of which were purchased from Tianjin Lialong.

[0065] The combined color powder is at least one of the common color powders such as 179 Red, Iron Red, Titanium Yellow, TS Yellow, 3G Orange, Ultramarine, Ultraviolet, 511A, 2B Blue, and Carbon Black.

[0066] The carbon black mentioned in the comparative example was purchased from Cabot, and its grade is M800.

[0067] The titanium dioxide mentioned in the comparative example was purchased from ChamuduPont, and its grade was R-105.

[0068] The mica powder mentioned in the comparative example was purchased from Chuzhou Kaijin Silk Mica Co., Ltd., and its brand name is KJ-4.

[0069] Example 1

[0070] This embodiment provides a metallic high-opacity PP material, comprising the following components in parts by weight: 50 parts homopolymer PP resin, 50 parts copolymer PP resin, 2 parts opacifier, 0.4 parts weather resistant agent, and 0.4 parts antioxidant. The opacifier comprises the following components in parts by weight: 60 parts aluminum powder of type 09-20B, 20 parts metallic powder modifier, and 20 parts lubricant.

[0071] This embodiment provides a method for preparing a metallic-colored, high-opacity PP material, including:

[0072] S1: Weigh out homopolymer PP resin and / or copolymer PP resin, opacifier, weather resistant agent, and antioxidant according to the weight parts to form composition B.

[0073] The methods for preparing the opacifier include:

[0074] S11: Weigh out the metal powder, metal powder modifier, and lubricant according to the weight parts to form composition A;

[0075] S12: Add composition A to a grinder and mix at high speed for 4 minutes;

[0076] S13: Pour out the treated composition A and use it as a light-blocking agent.

[0077] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0078] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0079] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare metallic high-opacity PP material particles, which can be used for injection molding into products.

[0080] Example 2

[0081] This embodiment provides a metallic high-opacity PP material, comprising the following components in parts by weight: 50 parts homopolymer PP resin, 50 parts copolymer PP resin, 2 parts opacifier, 0.4 parts weather resistant agent, and 0.4 parts antioxidant. The opacifier comprises the following components in parts by weight: 60 parts aluminum powder of type 12-20B, 20 parts metallic powder modifier, and 20 parts lubricant.

[0082] This embodiment provides a method for preparing a metallic-colored, high-opacity PP material, including:

[0083] S1: Weigh out homopolymer PP resin and / or copolymer PP resin, opacifier, weather resistant agent, and antioxidant according to the weight parts to form composition B.

[0084] The methods for preparing the opacifier include:

[0085] S11: Weigh out the metal powder, metal powder modifier, and lubricant according to the weight parts to form composition A;

[0086] S12: Add composition A to a grinder and mix at high speed for 4 minutes;

[0087] S13: Pour out the treated composition A and use it as a light-blocking agent.

[0088] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0089] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0090] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare metallic high-opacity PP material particles, which can be used for injection molding into products.

[0091] Example 3

[0092] This embodiment provides a metallic high-opacity PP material, comprising the following components in parts by weight: 50 parts homopolymer PP resin, 50 parts copolymer PP resin, 2 parts opacifier, 0.4 parts weather resistant agent, and 0.4 parts antioxidant. The opacifier comprises the following components in parts by weight: 60 parts aluminum powder of type 15-20B, 20 parts metallic powder modifier, and 20 parts lubricant.

[0093] This embodiment provides a method for preparing a metallic-colored, high-opacity PP material, including:

[0094] S1: Weigh out homopolymer PP resin and / or copolymer PP resin, opacifier, weather resistant agent, and antioxidant according to the weight parts to form composition B.

[0095] The methods for preparing the opacifier include:

[0096] S11: Weigh out the metal powder, metal powder modifier, and lubricant according to the weight parts to form composition A;

[0097] S12: Add composition A to a grinder and mix at high speed for 4 minutes;

[0098] S13: Pour out the treated composition A and use it as a light-blocking agent.

[0099] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0100] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0101] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare metallic high-opacity PP material particles, which can be used for injection molding into products.

[0102] Example 4

[0103] This embodiment provides a metallic high-opacity PP material, comprising the following components in parts by weight: 50 parts homopolymer PP resin, 50 parts copolymer PP resin, 2 parts opacifier, 0.4 parts weather resistant agent, and 0.4 parts antioxidant. The opacifier comprises the following components in parts by weight: 60 parts aluminum powder of type 19-20B, 20 parts metallic powder modifier, and 20 parts lubricant.

[0104] This embodiment provides a method for preparing a metallic-colored, high-opacity PP material, including:

[0105] S1: Weigh out homopolymer PP resin and / or copolymer PP resin, opacifier, weather resistant agent, and antioxidant according to the weight parts to form composition B.

[0106] The methods for preparing the opacifier include:

[0107] S11: Weigh out the metal powder, metal powder modifier, and lubricant according to the weight parts to form composition A;

[0108] S12: Add composition A to a grinder and mix at high speed for 4 minutes;

[0109] S13: Pour out the treated composition A and use it as a light-blocking agent.

[0110] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0111] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0112] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare metallic high-opacity PP material particles, which can be used for injection molding into products.

[0113] Example 5

[0114] This embodiment provides a metallic high-opacity PP material, comprising the following components in parts by weight: 50 parts homopolymer PP resin, 50 parts copolymer PP resin, 2 parts opacifier, 0.4 parts weather resistant agent, and 0.4 parts antioxidant. The opacifier comprises the following components in parts by weight: 60 parts aluminum powder of type 23-10B, 20 parts metallic powder modifier, and 20 parts lubricant.

[0115] This embodiment provides a method for preparing a metallic-colored, high-opacity PP material, including:

[0116] S1: Weigh out homopolymer PP resin and / or copolymer PP resin, opacifier, weather resistant agent, and antioxidant according to the weight parts to form composition B.

[0117] The methods for preparing the opacifier include:

[0118] S11: Weigh out the metal powder, metal powder modifier, and lubricant according to the weight parts to form composition A;

[0119] S12: Add composition A to a grinder and mix at high speed for 4 minutes;

[0120] S13: Pour out the treated composition A and use it as a light-blocking agent.

[0121] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0122] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0123] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare metallic high-opacity PP material particles, which can be used for injection molding into products.

[0124] Example 6

[0125] This embodiment provides a metallic high-opacity PP material, comprising the following components in parts by weight: 50 parts homopolymer PP resin, 50 parts copolymer PP resin, 1 part opacifier, 0.4 parts weather resistant agent, and 0.4 parts antioxidant. The opacifier comprises the following components in parts by weight: 60 parts aluminum powder of type 09-20B, 20 parts metallic powder modifier, and 20 parts lubricant.

[0126] This embodiment provides a method for preparing a metallic-colored, high-opacity PP material, including:

[0127] S1: Weigh out homopolymer PP resin and / or copolymer PP resin, opacifier, weather resistant agent, and antioxidant according to the weight parts to form composition B.

[0128] The methods for preparing the opacifier include:

[0129] S11: Weigh out the metal powder, metal powder modifier, and lubricant according to the weight parts to form composition A;

[0130] S12: Add composition A to a grinder and mix at high speed for 4 minutes;

[0131] S13: Pour out the treated composition A and use it as a light-blocking agent.

[0132] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0133] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0134] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare metallic high-opacity PP material particles, which can be used for injection molding into products.

[0135] Example 7

[0136] This embodiment provides a metallic high-opacity PP material, comprising the following components in parts by weight: 50 parts homopolymer PP resin, 50 parts copolymer PP resin, 1 part opacifier, 0.4 parts weather resistant agent, and 0.4 parts antioxidant. The opacifier comprises the following components in parts by weight: 60 parts aluminum powder of type 12-20B, 20 parts metallic powder modifier, and 20 parts lubricant.

[0137] This embodiment provides a method for preparing a metallic-colored, high-opacity PP material, including:

[0138] S1: Weigh out homopolymer PP resin and / or copolymer PP resin, opacifier, weather resistant agent, and antioxidant according to the weight parts to form composition B.

[0139] The methods for preparing the opacifier include:

[0140] S11: Weigh out the metal powder, metal powder modifier, and lubricant according to the weight parts to form composition A;

[0141] S12: Add composition A to a grinder and mix at high speed for 4 minutes;

[0142] S13: Pour out the treated composition A and use it as a light-blocking agent.

[0143] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0144] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0145] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare metallic high-opacity PP material particles, which can be used for injection molding into products.

[0146] Example 8

[0147] This embodiment provides a metallic high-opacity PP material, comprising the following components in parts by weight: 0-100 parts homopolymer PP resin, 0-100 parts copolymer PP resin, 3 parts toughening agent, 2 parts opacifier, 0.4 parts weathering agent, 0.4 parts antioxidant, 0.5 parts abrasion resistant agent, and 0.11 parts colorant; wherein the opacifier comprises the following components in parts by weight: 60 parts aluminum powder (model 09-20B), 20 parts metallic powder modifier, and 20 parts lubricant. The colorant comprises 0.03 parts 179 red and 0.08 parts 3G orange.

[0148] This embodiment provides a method for preparing a metallic-colored, high-opacity PP material, including:

[0149] S1: Weigh out homopolymer PP resin and / or copolymer PP resin, opacifier, weather resistant agent, antioxidant, and colorant according to the weight parts to form composition B.

[0150] The methods for preparing the opacifier include:

[0151] S11: Weigh out the metal powder, metal powder modifier, and lubricant according to the weight parts to form composition A;

[0152] S12: Add composition A to a grinder and mix at high speed for 4 minutes;

[0153] S13: Pour out the treated composition A and use it as a light-blocking agent.

[0154] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0155] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0156] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare metallic high-opacity PP material particles, which can be used for injection molding into products.

[0157] Example 9

[0158] This embodiment provides a metallic high-opacity PP material, comprising the following components in parts by weight: 0-100 parts homopolymer PP resin, 0-100 parts copolymer PP resin, 3 parts toughening agent, 2 parts opacifier, 0.4 parts weathering agent, 0.4 parts antioxidant, 0.5 parts abrasion resistant agent, and 0.05 parts colorant; wherein the opacifier comprises the following components in parts by weight: 60 parts aluminum powder of type 09-20B, 20 parts metallic powder modifier, and 20 parts lubricant. The colorant comprises 0.04 parts M800 carbon black and 0.01 parts 2B blue.

[0159] This embodiment provides a method for preparing a metallic-colored, high-opacity PP material, including:

[0160] S1: Weigh out homopolymer PP resin and / or copolymer PP resin, opacifier, weather resistant agent, antioxidant, and colorant according to the weight parts to form composition B.

[0161] The methods for preparing the opacifier include:

[0162] S11: Weigh out the metal powder, metal powder modifier, and lubricant according to the weight parts to form composition A;

[0163] S12: Add composition A to a grinder and mix at high speed for 4 minutes;

[0164] S13: Pour out the treated composition A and use it as a light-blocking agent.

[0165] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0166] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0167] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare metallic high-opacity PP material particles, which can be used for injection molding into products.

[0168] Comparative Example 1

[0169] Comparative Example 1 provides a metallic high-opacity PP material, comprising the following components in parts by weight: 50 parts homopolymer PP resin, 50 parts copolymer PP resin, 1 part opacifier, 0.4 parts weather resistant agent, and 0.4 parts antioxidant. The opacifier comprises the following components in parts by weight: 60 parts aluminum powder of type 15-20B, 20 parts metallic powder modifier, and 20 parts lubricant.

[0170] Comparative Example 1 provides a method for preparing a metallic-colored, high-opacity PP material, comprising:

[0171] S1: Weigh out homopolymer PP resin and / or copolymer PP resin, opacifier, weather resistant agent, and antioxidant according to the weight parts to form composition B.

[0172] The methods for preparing the opacifier include:

[0173] S11: Weigh out the metal powder, metal powder modifier, and lubricant according to the weight parts to form composition A;

[0174] S12: Add composition A to a grinder and mix at high speed for 4 minutes;

[0175] S13: Pour out the treated composition A and use it as a light-blocking agent.

[0176] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0177] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0178] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare metallic high-opacity PP material particles, which can be used for injection molding into products.

[0179] Comparative Example 2

[0180] Comparative Example 2 provides a metallic high-opacity PP material, comprising the following components in parts by weight: 50 parts homopolymer PP resin, 50 parts copolymer PP resin, 1 part opacifier, 0.4 parts weather resistant agent, and 0.4 parts antioxidant. The opacifier comprises the following components in parts by weight: 60 parts aluminum powder of type 19-20B, 20 parts metallic powder modifier, and 20 parts lubricant.

[0181] Comparative Example 2 provides a method for preparing a metallic-colored high-opacity PP material, comprising:

[0182] S1: Weigh out homopolymer PP resin and / or copolymer PP resin, opacifier, weather resistant agent, and antioxidant according to the weight parts to form composition B.

[0183] The methods for preparing the opacifier include:

[0184] S11: Weigh out the metal powder, metal powder modifier, and lubricant according to the weight parts to form composition A;

[0185] S12: Add composition A to a grinder and mix at high speed for 4 minutes;

[0186] S13: Pour out the treated composition A and use it as a light-blocking agent.

[0187] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0188] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0189] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare metallic high-opacity PP material particles, which can be used for injection molding into products.

[0190] Comparative Example 3

[0191] Comparative Example 3 provides a metallic high-opacity PP material, comprising the following components in parts by weight: 50 parts homopolymer PP resin, 50 parts copolymer PP resin, 1 part opacifier, 0.4 parts weather resistant agent, and 0.4 parts antioxidant. The opacifier comprises the following components in parts by weight: 60 parts aluminum powder of type 23-10B, 20 parts metallic powder modifier, and 20 parts lubricant.

[0192] Comparative Example 3 provides a method for preparing a metallic-colored, high-opacity PP material, comprising:

[0193] S1: Weigh out homopolymer PP resin and / or copolymer PP resin, opacifier, weather resistant agent, and antioxidant according to the weight parts to form composition B.

[0194] The methods for preparing the opacifier include:

[0195] S11: Weigh out the metal powder, metal powder modifier, and lubricant according to the weight parts to form composition A;

[0196] S12: Add composition A to a grinder and mix at high speed for 4 minutes;

[0197] S13: Pour out the treated composition A and use it as a light-blocking agent.

[0198] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0199] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0200] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare metallic high-opacity PP material particles, which can be used for injection molding into products.

[0201] Comparative Example 4

[0202] Comparative Example 4 provides a metallic high-opacity PP material, comprising the following components in parts by weight: 50 parts homopolymer PP resin, 50 parts copolymer PP resin, 1 part opacifier, 0.4 parts weather resistant agent, and 0.4 parts antioxidant. The opacifier comprises the following components in parts by weight: 60 parts aluminum powder of type 09-20B and 40 parts lubricant.

[0203] Comparative Example 4 provides a method for preparing a metallic-colored high-opacity PP material, comprising:

[0204] S1: Weigh out homopolymer PP resin and / or copolymer PP resin, opacifier, weather resistant agent, and antioxidant according to the weight parts to form composition B.

[0205] The methods for preparing the opacifier include:

[0206] S11: Weigh out the metal powder and lubricant according to the weight parts to form composition A;

[0207] S12: Add composition A to a grinder and mix at high speed for 4 minutes;

[0208] S13: Pour out the treated composition A and use it as a light-blocking agent.

[0209] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0210] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0211] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare metallic high-opacity PP material particles, which can be used for injection molding into products.

[0212] Comparative Example 5

[0213] Comparative Example 5 provides a white high-opacity PP material comprising the following components in parts by weight: 50 parts homopolymer PP resin, 50 parts copolymer PP resin, 12 parts titanium dioxide R-105, 0.4 parts weather resistant agent, and 0.4 parts antioxidant.

[0214] Comparative Example 5 provides a method for preparing a white, high-opacity PP material, comprising:

[0215] S1: Weigh out homopolymer PP resin, copolymer PP resin, titanium dioxide R-105, weathering agent, and antioxidant according to the specified weight parts to form composition B.

[0216] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0217] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0218] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare white high-opacity PP material particles, which can be used for injection molding into products.

[0219] Comparative Example 6

[0220] Comparative Example 6 provides a black high-opacity PP material comprising the following components in parts by weight: 50 parts homopolymer PP resin, 50 parts copolymer PP resin, 56 parts carbon black R-10, 0.4 parts weather resistant agent, and 0.4 parts antioxidant.

[0221] Comparative Example 6 provides a method for preparing a black high-opacity PP material, comprising:

[0222] S1: Homopolymer PP resin, copolymer PP resin, carbon black, weathering agent, antioxidant, constitute composition B.

[0223] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0224] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0225] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare black high-opacity PP material particles, which can be used for injection molding into products.

[0226] Comparative Example 7

[0227] Comparative Example 7 provides a white high-opacity PP material comprising the following components in parts by weight: 50 parts homopolymer PP resin, 50 parts copolymer PP resin, 8 parts mica powder, 4 parts titanium dioxide, 0.4 parts weathering agent, 0.4 parts antioxidant, and 0.6 parts aluminum strip 09-20B as colorant.

[0228] Comparative Example 7 provides a method for preparing a white, high-opacity PP material, comprising:

[0229] S1: Homopolymer PP resin, copolymer PP resin, mica powder, titanium dioxide, weathering agent, antioxidant, and aluminum strip constitute composition B.

[0230] S2: Add composition B to a high-speed mixer and mix for 2 minutes at room temperature with a speed of 1200 rad / min. After the material is mixed, remove it for further processing.

[0231] S3: Set the temperature of the twin-screw extruder. The temperature zones of the twin-screw extruder are set as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 200℃, Zone 4: 200℃, Zone 5: 190℃, Zone 6: 195℃, Zone 7: 200℃, Zone 8: 200℃, and the die head temperature is 200℃.

[0232] S4: After the temperature of the processing equipment stabilizes, turn on the equipment and clean it. Then add composition B to the main feed, adjust the twin screw speed, feeding speed and water passage length, and granulate it through a pelletizer to prepare white high-opacity PP material particles, which can be used for injection molding into products.

[0233] The formulations of the opacifiers in the above embodiments and comparative examples are shown in Table 1, the formulations of the metallic high opacity PP materials are shown in Table 2, and the corresponding test results are shown in Table 3.

[0234] The testing methods are described below:

[0235] Tensile strength testing is conducted according to standard GB / T 1040;

[0236] Bending strength and bending modulus tests are conducted in accordance with standard GB / T 9341;

[0237] The notched impact strength test of cantilever beams is conducted according to standard GB / T 1843.

[0238] Light transmittance was measured directly using a haze meter. The same experiment was repeated 7 times on different plates, and the average value was taken.

[0239] The transmittance tolerance is calculated by measuring the transmittance at the maximum value minus the minimum value for 7 different plates in the same experiment.

[0240] Brightness was measured directly using a colorimeter, and the L value was the brightness result.

[0241] Gloss was measured directly using a gloss meter, and the result was taken at an incident angle of 60°.

[0242] Appearance color evaluation method: Name it directly based on visual color comparison with standard sample.

[0243] Table 1. Formulations of the light-blocking agents in the examples and comparative examples.

[0244]

[0245]

[0246] Table 2. Formulations of metallic high-opacity PP materials in the examples and comparative examples.

[0247]

[0248]

[0249] Table 3. Test results of metallic high-opacity PP materials in the examples and comparative examples.

[0250]

[0251]

[0252] Based on the above test results, the analysis is as follows:

[0253] Comparative analysis of Examples 1-5 shows that with the addition of 2 parts of opaque agent, that is, when the amount of opaque agent added is 2wt% relative to the mass fraction of AS resin, 1mm of metallic high opaque PP material can achieve a high opacity of no more than 0.01% light transmittance, without the risk of local light leakage.

[0254] Comparative analysis of Examples 6-7 and Comparative Examples 1-3 revealed that the light-blocking properties of the opaque agent decreased as the particle size of the selected aluminum powder increased. With an addition of 1 part opaque agent, if the particle size D50 of the selected metal powder is 12 μm or less, the light transmittance of a 1 mm thick metallic high-opaque PP material can be ensured to be no higher than 0.01%, achieving a high light-blocking effect. When the particle size D50 of the metal powder is greater than 12 μm, adding only 1 part opaque agent cannot guarantee that the light transmittance of a 1 mm thick metallic high-opaque PP material will not exceed 0.01%, and the corresponding formulation needs to be applied to thicker opaque parts.

[0255] Comparative analysis of Examples 1-7 and Comparative Examples 1-3 revealed that the brightness L value of the part increased with the increase of the amount added and decreased with the increase of the selected aluminum strip particle size.

[0256] Comparative analysis of Example 1 and Examples 8-9 revealed that by adding color powder, a variety of metallic appearance color effects can be achieved.

[0257] Comparative analysis of Example 6 and Comparative Example 4 shows that, without the use of metallic powder modifiers, the light transmittance of the opaque PP product in this application was continuously tested on different color samples of the same case. The opaque PP product exhibited poor opaque stability, and reducing the amount added to save costs posed a risk of localized light leakage. Furthermore, due to insufficient dispersibility of aluminum powder, the material properties were slightly affected, and the gloss level decreased.

[0258] Comparative analysis of Comparative Examples 5-6 and Examples 1-9 revealed that the extensive use of titanium dioxide and carbon black fillers can affect the toughness of the material.

[0259] Comparative analysis of Comparative Example 7 with Examples 1-9 and Comparative Example 5 revealed that mica powder, titanium dioxide and aluminum pigment, which are used as opacifiers, have an antagonistic effect, mainly manifested as low gloss, lack of metallic texture, decreased lightness L value and grayish color.

[0260] The metallic high-opacity PP material provided in this application can meet the market's demand for diverse appearance colors and achieve a metallic texture effect, thereby enhancing the product's look and taste.

[0261] The metallic high-opacity PP material provided in this application only requires an addition of 2% of the opacifier to achieve a light transmittance of no more than 0.01% at a thickness of 1 mm, while maintaining excellent physical properties. It can be directly used to replace traditional opacifier materials.

[0262] The metallic high-opacity PP material provided in this application uses an opacifier containing a metallic powder modifier, which can pre-treat the metallic powder, causing the agglomerates formed by the local aggregation of metallic powder particles to dissociate, forming electrostatic stabilization and steric stabilization effects, so that the metallic particles are evenly distributed in the substrate, float on the surface, effectively form a mirror reflection layer, and improve gloss and brightness.

[0263] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0264] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A metallic-colored, high-light-blocking PP material, characterized in that, It includes the following components in parts by weight: 0-100 parts homopolymer PP resin, 0-100 parts copolymer PP resin, 1-5 parts opacifier, 0.2-1.5 parts weather resistant agent, and 0.2-0.6 parts antioxidant; The light-blocking agent comprises the following components in parts by weight: 50-80 parts of metal powder, 10-30 parts of metal powder modifier, and 10-20 parts of lubricant.

2. The metallic high-opacity PP material according to claim 1, characterized in that, The metal powder is aluminum powder.

3. The metallic high-opacity PP material according to claim 1, characterized in that, The metal powder modifier is at least one of alkylammonium salt, alkylphosphonium salt, and alkylsulfonium salt.

4. The metallic high-opacity PP material according to claim 3, characterized in that, The lubricant is at least one of ethylene bis-stearamide, pentaerythritol stearate, oleamide, erucamide, magnesium stearate, and calcium stearate.

5. The metallic high-opacity PP material according to claim 1, characterized in that, The weather-resistant agent includes at least one of light stabilizers and ultraviolet absorbers.

6. The metallic high-opacity PP material according to claim 1, characterized in that, The metallic high-opacity PP material also includes 0.2-0.5 parts of color powder.

7. The metallic high-opacity PP material according to claim 1, characterized in that, The melt index of the homopolymer PP resin is between 10-150 g / 10 min, and the melt index of the copolymer PP resin is between 2-40 g / 10 min.

8. A method for preparing a metallic high-opacity PP material, characterized in that, The preparation of a metallic high-opacity PP material according to any one of claims 1-7 comprises: Weigh out the metal powder, metal powder modifier and lubricant according to the weight proportions, mix them evenly to form a light-blocking agent; Weigh out the homopolymer PP resin and / or copolymer PP resin, opacifier, weather resistant agent, and antioxidant according to the weight parts, and mix them evenly; The uniformly mixed components are fed into an extruder for full melting and blending. After extrusion, cooling, and pelletizing, a metallic high-opacity PP material is obtained.

9. The method for preparing a metallic high-opacity PP material according to claim 8, characterized in that, The extruder is a twin-screw extruder. When preparing the metallic high-opacity PP material, the processing temperatures of the twin-screw extruder are as follows: Zone 1: 180°C; Zone 2: 200°C; Zone 3: 200°C; Zone 4: 200°C; Zone 5: 190°C; Zone 6: 195°C; Zone 7: 200°C; Zone 8: 200°C; and Die head: 200°C.

10. An application of a metallic-colored, high-opacity PP material, characterized in that, The metallic high-opacity PP material according to any one of claims 1-7 is used in the field of LED lighting.

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