Light-transmitting polypropylene material, preparation method thereof and automobile bumper

Abstract

The invention relates to a light-transmitting polypropylene material, a preparation method thereof and an automobile bumper. The light-transmitting polypropylene material is prepared from the following raw materials in parts by weight: 60 to 70 parts of metallocene atactic polypropylene, 10 to 20 parts of propylene-ethylene copolymer elastomer and 10 to 20 parts of mica powder. According to the light-transmitting polypropylene material, by adjusting the proportion of the metallocene atactic polypropylene, the propylene-ethylene copolymer elastomer and the mica powder, the light-transmitting polypropylene material can keep higher light transmittance on the premise of having high toughness and high rigidity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of functional synthetic resin, in particular to a light-transmitting polypropylene material, a preparation method thereof and an automobile bumper. BACKGROUND

[0002] In recent years, high-transmittance materials that can be used in cooperation with light-emitting objects have been favored by consumers, and the market demand for such products continues to grow.

[0003] Polypropylene is a thermoplastic synthetic resin with excellent performance, and has been widely used in the fields of automobile parts, industrial equipment, medical devices, etc. In order to obtain good mechanical properties, polypropylene materials usually contain a large amount of fillers, and the addition of fillers usually leads to a decrease in the light transmission performance of the material. At present, traditional polypropylene materials are difficult to have good mechanical properties and high light transmittance at the same time. SUMMARY

[0004] Therefore, it is necessary to provide a light-transmitting polypropylene material with excellent mechanical properties and high light transmittance, a preparation method thereof, and an automobile bumper.

[0005] In a first aspect, the present application provides a light-transmitting polypropylene material.

[0006] A light-transmitting polypropylene material includes the following raw materials in parts by weight:

[0007] 60-70 parts of metallocene random polypropylene;

[0008] 10-20 parts of propylene ethylene copolymer elastomer; and

[0009] 10-20 parts of mica powder.

[0010] In some embodiments, the metallocene random polypropylene has a polydispersity coefficient of 1.5-2.5; and / or

[0011] The metallocene random polypropylene has a 2.5mm light transmittance of 80%-90% and a haze of 35%-45% under D65 light source.

[0012] In some embodiments, the propylene ethylene copolymer elastomer has a melt index of 10g / 10min-20g / 10min at 2.16kg and 230℃.

[0013] In some embodiments, the mica powder includes phengite fluorophlogopite powder; and / or

[0014] The D50 of the mica powder is 5-50μm.

[0015] In some embodiments, the mass ratio of the propylene ethylene copolymer elastomer to the mica powder is 5:(2-5).

[0016] In some embodiments, the preparation raw materials of the light-transmitting polypropylene material further include, in parts by weight:

[0017] The anti-oxidation aid is 0.3-0.5 parts;

[0018] The light stabilizer is 0.3-0.5 parts;

[0019] The lubrication aid is 0.3-1 part.

[0020] In some embodiments, the light stabilizer includes one or more of a hindered amine light stabilizer and a UV absorbing light stabilizer; and / or

[0021] The lubrication aid includes a metal soap lubrication aid; and / or

[0022] The anti-oxidation aid includes one or more of a hindered phenol anti-oxidation aid, a phosphite anti-oxidation aid, and a thioester anti-oxidation aid.

[0023] In a second aspect, the present application provides a preparation method of the light-transmitting polypropylene material.

[0024] The preparation method of the light-transmitting polypropylene material includes the following steps:

[0025] The preparation raw materials of the light-transmitting polypropylene material are mixed according to the proportion to form a mixture;

[0026] The mixture is melt-blended and extruded and granulated.

[0027] In some embodiments, the temperature of the melt-blending is 150-220°C, and the temperature of the extrusion and granulation is 200-230°C.

[0028] In a third aspect, the present application provides an automobile bumper.

[0029] The automobile bumper includes the light-transmitting polypropylene material.

[0030] The light-transmitting polypropylene material adds a certain amount of mica powder as a rigid filler to improve the mechanical properties, and adds a propylene ethylene copolymer elastomer which is compatible with the mica powder and the metallocene random polypropylene to assist the dispersion of the mica powder, thereby effectively avoiding the agglomeration of the filler in the light-transmitting polypropylene material, so that the light-transmitting polypropylene material can maintain a high light transmittance under the premise of high toughness and high stiffness. DETAILED DESCRIPTION

[0031] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different manners, which are different from those described herein, and it can be apparent that similar modifications of this kind can be made by those skilled in the art without departing from the scope of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0032] In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless specifically limited otherwise. In the present application, the meaning of "at least one" is one or more, such as one, two, and more than two. The meaning of "a plurality" or "several" is at least two, such as two, three, etc.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing specific embodiments of the present application, and is not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0034] When a numerical range is disclosed herein, the range is to be construed as continuous, and includes each and every value within the range, as well as the minimum and maximum values of the range. Further, when a range is stated to include integers, the range includes each and every integer within the range. In addition, when a plurality of ranges are provided, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood as encompassing any and all sub-ranges subsumed therein.

[0035] The percentage content involved in the present application, such as without specific indication, refers to mass percentage for solid-liquid mixing and solid-solid mixing, and refers to volume percentage for liquid-liquid mixing.

[0036] If not specifically stated, all steps of the present application can be performed in sequence, or randomly. For example, the method comprises steps (a) and (b), which means that the method can comprise steps (a) and (b) in sequence, or steps (b) and (a) in sequence. For example, the method is mentioned to further comprise step (c), which means that step (c) can be added to the method in any order, for example, the method can comprise steps (a), (b) and (c), or steps (a), (c) and (b), or steps (c), (a) and (b), etc.

[0037] In the present application, "above" or "below" includes the number itself. For example, 1 below includes 1.

[0038] The temperature parameters in the present application, if not particularly limited, allow for constant temperature treatment as well as for variations within a certain temperature interval. It is to be understood that the constant temperature treatment allows for fluctuations within the accuracy of the instrument control. Fluctuations within a range of, for example, ±5°C, ±4°C, ±3°C, ±2°C, ±1°C are allowed.

[0039] In recent years, high-transmittance materials that can be used in cooperation with light-emitting articles have been favored by consumers, and the market demand for such products continues to grow.

[0040] Polypropylene is a thermoplastic synthetic resin with excellent performance, and has been widely used in the fields of automobile parts, industrial equipment, medical devices, etc. In order to obtain good mechanical properties, polypropylene materials usually contain a large amount of fillers, and the addition of fillers usually leads to a straight decline in the light transmittance of the material, and polypropylene itself is generally white, making it difficult for traditional polypropylene materials to have both good mechanical properties and high light transmittance.

[0041] Based on this, the first aspect of the present application provides a light-transmitting polypropylene material with excellent mechanical properties and high light transmittance.

[0042] Exemplarily, the light-transmitting polypropylene material includes the following preparation raw materials in parts by weight:

[0043] 60-70 parts of metallocene random polypropylene;

[0044] 10-20 parts of propylene ethylene copolymer elastomer; and

[0045] 10-20 parts of mica powder.

[0046] The light-transmitting polypropylene material described above can effectively avoid the agglomeration of fillers in the light-transmitting polypropylene material by adding a certain amount of mica powder as a rigid filler to improve the mechanical properties, and adding a propylene ethylene copolymer elastomer that is compatible with the mica powder and the metallocene random polypropylene to assist in dispersion, so that the light-transmitting polypropylene material can maintain high light transmittance on the premise of high toughness and high stiffness.

[0047] Optionally, the mass fraction of the metallocene random polypropylene in the preparation raw materials of the light-transmitting polypropylene material can be, but is not limited to, 60 parts, 61 parts, 62 parts, 63 parts, 64 parts, 65 parts, 66 parts, 67 parts, 68 parts, 69 parts, 70 parts, or other values within the range of 60-70 parts. Compared with metallocene homopolymer polypropylene, metallocene copolymer polypropylene and traditional random polypropylene, metallocene random polypropylene has better light transmittance and is suitable for serving as a resin matrix, but if the addition amount is too high, the overall rigidity will be poor.

[0048] Optionally, the mass fraction of the propylene ethylene copolymer elastomer in the raw materials for preparing the light-transmitting polypropylene material can be, but is not limited to, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, or other values within the range of 10-20 parts. The propylene ethylene copolymer elastomer has good compatibility with the metallocene random polypropylene and the mica powder, and can play an auxiliary dispersion role, but if the amount is too high, the rigidity will be poor.

[0049] Optionally, the mass fraction of the mica powder in the raw materials for preparing the light-transmitting polypropylene material can be, but is not limited to, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, or other values within the range of 10-20 parts. The mica powder can effectively improve the mechanical properties of the light-transmitting polypropylene material, but if the amount is too high, agglomerates will be easily formed, resulting in a sharp decrease in the light transmittance.

[0050] In general, keeping the mass fractions of the metallocene random polypropylene, the propylene ethylene copolymer elastomer, and the mica powder within the above ranges can make the obtained light-transmitting polypropylene material have good mechanical properties and high light transmittance.

[0051] In some embodiments, the polydispersity index of the metallocene random polypropylene is 1.5-2.5.

[0052] Optionally, the polydispersity index of the metallocene random polypropylene can be, but is not limited to, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, or other values within the range of 1.5-2.5. When the polydispersity index of the metallocene random polypropylene is within the above narrower range, the crystalline morphology is more regular, thereby reducing problems such as light scattering caused by crystallization, which is helpful to further improve the light transmittance and facilitate processing.

[0053] In some embodiments, the 2.5 mm light transmittance of the metallocene random polypropylene under the D65 light source is 80%-90%, and the haze is 35%-45%.

[0054] Optionally, the 2.5 mm light transmittance of the metallocene random polypropylene under the D65 light source can be, but is not limited to, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, or other values within the range of 80-90%.

[0055] Optionally, the 2.5 mm haze of the metallocene random polypropylene under the D65 light source can be, but is not limited to, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, or other values within the range of 35-45%.

[0056] In some embodiments, the propylene ethylene copolymer elastomer has a melt index of 10 g / 10 min to 20 g / 10 min at 2.16 kg, 230°C, and the segment ratio of the propylene ethylene copolymer elastomer can be selected as desired. Alternatively, the propylene ethylene copolymer elastomer can have a melt index of, but not limited to, 10 g / 10 min, 11 g / 10 min, 12 g / 10 min, 13 g / 10 min, 14 g / 10 min, 15 g / 10 min, 16 g / 10 min, 17 g / 10 min, 18 g / 10 min, 19 g / 10 min, 20 g / 10 min, or other values within the range of 10 g / 10 min to 20 g / 10 min.

[0057] In some embodiments, the mica powder includes an orthorhombic fluorophlogopite powder, and the mica powder has a D50 of 5 μm to 50 μm. Alternatively, the mica powder can have a D50 of, but not limited to, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, or other values within the range of 5 μm to 50 μm. The orthorhombic fluorophlogopite powder has high purity and good structural regularity, which helps to improve the light transmittance.

[0058] In some embodiments, the mass ratio of the propylene ethylene copolymer elastomer to the mica powder is 5:(2-5). Alternatively, the mass ratio of the propylene ethylene copolymer elastomer to the mica powder can be, but not limited to, 5:2, 2:1, 5:3, 10:7, 5:4, 10:9, 1:1, or other values within the range of 5:(2-5). Maintaining the mass ratio of the propylene ethylene copolymer elastomer to the mica powder within the above range helps to balance the light transmittance, haze, and mechanical properties of the light-transmittance polypropylene material.

[0059] In some embodiments, the raw materials for preparing the light-transmittance polypropylene material further include, by weight parts:

[0060] antioxidant 0.3 parts to 0.5 parts;

[0061] light stabilizer 0.3 parts to 0.5 parts;

[0062] lubricating aid 0.3 parts to 1 part.

[0063] Alternatively, the weight parts of the antioxidant in the raw materials for preparing the light-transmittance polypropylene material can be, but not limited to, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, 0.5 parts, or other values within the range of 0.3 parts to 0.5 parts.

[0064] Optionally, the weight fraction of the light stabilizer in the raw materials for preparing the light-transmissive polypropylene material can be, but is not limited to, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 part, or other values within the range of 0.3 parts to 1 part.

[0065] Optionally, the weight fraction of the lubricant aid in the raw materials for preparing the light-transmissive polypropylene material can be, but is not limited to, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, 0.5 parts, or other values within the range of 0.3 parts to 0.5 parts.

[0066] In some embodiments, the light stabilizer comprises one or more of a hindered amine light stabilizer and an ultraviolet absorbing light stabilizer.

[0067] In some embodiments, the lubricant aid comprises a metal soap lubricant aid.

[0068] In some embodiments, the antioxidant aid comprises one or more of a hindered phenol antioxidant, a phosphite antioxidant, and a thioester antioxidant.

[0069] In a second aspect, the present application provides a method for preparing the light-transmissive polypropylene material.

[0070] The method for preparing the light-transmissive polypropylene material comprises the following steps:

[0071] The raw materials for preparing the light-transmissive polypropylene material are mixed according to the proportions to form a mixture;

[0072] The mixture is melt-blended and extruded and granulated.

[0073] In some embodiments, a twin-screw extruder is used to melt-blend and extrude and granulate the mixture;

[0074] The process parameters of the twin-screw extruder include:

[0075] The main motor speed for melt-blending is 350 rpm to 400 rpm;

[0076] The temperature for melt-blending is 150°C to 220°C;

[0077] The temperature for extruding and granulating is 200°C to 230°C.

[0078] In some embodiments, the time for melt-blending is 10 min to 15 min.

[0079] In a third aspect, the application provides an automobile bumper. The automobile bumper comprises the light-transmitting polypropylene material. By using the light-transmitting polypropylene material, the automobile bumper not only has strong mechanical properties, but also has high light transmittance and high haze, and has good market prospects.

[0080] The application will be further described in detail below with reference to specific examples.

[0081] In the following specific examples and comparative examples, the raw materials used, unless otherwise specified, are commercially available products; the instruments used, unless otherwise specified, are commercially available products; and the processes used, unless otherwise specified, are routinely selected by those skilled in the art.

[0082] Example 1

[0083] This example provides a light-transmitting polypropylene material.

[0084] The raw materials for preparing the light-transmitting polypropylene material of this example are as follows in terms of mass fraction:

[0085] 70 parts of metallocene random polypropylene;

[0086] 10 parts of propylene ethylene copolymer elastomer;

[0087] 18 parts of fluorophlogopite powder;

[0088] 0.5 parts of antioxidant aid;

[0089] 0.5 parts of light stabilizer; and

[0090] 1 part of lubricating aid.

[0091] The metallocene random polypropylene has a polydispersity coefficient of 1.5 and a melt index of 24 g / 10 min at 2.16 kg and 230°C; the propylene ethylene copolymer elastomer has a melt index of 20 g / 10 min at 2.16 kg and 230°C; the fluorophlogopite powder has a D50 of 45 μm; the antioxidant aid is an equal mass ratio mixture of hindered phenol, phosphite, and thioester antioxidant aids; the light stabilizer is an equal mass ratio mixture of hindered amine and ultraviolet absorbing light stabilizers; and the lubricant is a metal soap lubricant.

[0092] The preparation method of the light-transmitting polypropylene material of this example is as follows:

[0093] The metallocene random polypropylene, propylene ethylene copolymer elastomer, fluorophlogopite powder, antioxidant aid, light stabilizer, and lubricating aid are mixed in a mass ratio to form a mixture;

[0094] The mixture is melt blended and extruded into granules in a twin-screw extruder.

[0095] Example 2

[0096] The present example provides a light-transmitting polypropylene material.

[0097] The raw materials and the preparation method of the light-transmitting polypropylene material of the present example are basically the same as those of Example 1, except that:

[0098] The raw materials of the light-transmitting polypropylene material contain 15 parts of propylene ethylene copolymer elastomer and 13 parts of fluorphlogopite powder by mass fraction.

[0099] Example 3

[0100] The present example provides a light-transmitting polypropylene material.

[0101] The raw materials and the preparation method of the light-transmitting polypropylene material of the present example are basically the same as those of Example 1, except that:

[0102] The raw materials of the light-transmitting polypropylene material contain 18 parts of propylene ethylene copolymer elastomer and 10 parts of fluorphlogopite powder by mass fraction.

[0103] Example 4

[0104] The present example provides a light-transmitting polypropylene material.

[0105] The raw materials and the preparation method of the light-transmitting polypropylene material of the present example are basically the same as those of Example 1, except that:

[0106] The raw materials of the light-transmitting polypropylene material contain 21 parts of propylene ethylene copolymer elastomer and 7 parts of fluorphlogopite powder by mass fraction.

[0107] Example 5

[0108] The present example provides a light-transmitting polypropylene material.

[0109] The raw materials and the preparation method of the light-transmitting polypropylene material of the present example are basically the same as those of Example 1, except that:

[0110] The raw materials of the light-transmitting polypropylene material contain 65 parts of metallocene random polypropylene, 13 parts of propylene ethylene copolymer elastomer and 20 parts of fluorphlogopite powder by mass fraction.

[0111] Example 6

[0112] The present example provides a light-transmitting polypropylene material.

[0113] The raw materials and the preparation method of the light-transmitting polypropylene material of the present example are basically the same as those of Example 1, except that:

[0114] The raw material for preparing the light-transmitting polypropylene material contains 65 parts of metallocene random polypropylene, 16 parts of propylene ethylene copolymer elastomer and 17 parts of fluorphlogopite powder in terms of mass fraction.

[0115] Example 7

[0116] The present example provides a light-transmitting polypropylene material.

[0117] The raw material for preparing the light-transmitting polypropylene material and the preparation method of the present example are basically the same as those of Example 1, except that:

[0118] The raw material for preparing the light-transmitting polypropylene material contains 65 parts of metallocene random polypropylene, 16 parts of propylene ethylene copolymer elastomer and 17 parts of fluorphlogopite powder in terms of mass fraction.

[0119] Example 8

[0120] The present example provides a light-transmitting polypropylene material.

[0121] The raw material for preparing the light-transmitting polypropylene material and the preparation method of the present example are basically the same as those of Example 1, except that:

[0122] The raw material for preparing the light-transmitting polypropylene material contains 65 parts of metallocene random polypropylene, 16 parts of propylene ethylene copolymer elastomer and 17 parts of fluorphlogopite powder in terms of mass fraction.

[0123] Example 9

[0124] The present example provides a light-transmitting polypropylene material.

[0125] The raw material for preparing the light-transmitting polypropylene material and the preparation method of the present example are basically the same as those of Example 1, except that:

[0126] The raw material for preparing the light-transmitting polypropylene material contains 65 parts of metallocene random polypropylene, 16 parts of propylene ethylene copolymer elastomer and 17 parts of fluorphlogopite powder in terms of mass fraction.

[0127] Comparative Example 1

[0128] The present example provides a light-transmitting polypropylene material.

[0129] The preparation method of the light-transmitting polypropylene material of the present example is basically the same as that of Example 1, except that the raw material for preparing the light-transmitting polypropylene material contains:

[0130] 70 parts of common random polypropylene;

[0131] 18 parts of propylene ethylene copolymer elastomer;

[0132] Fluorophlogopite powder 10 parts;

[0133] Antioxidant aid 0.5 parts;

[0134] Light stabilizer 0.5 parts; and

[0135] Lubricating aid 1 part.

[0136] The ordinary random polypropylene is Ziegler-Natta catalyst random polypropylene PPRP344R.

[0137] Comparative Example 2

[0138] The present comparative example provides a light-transmitting polypropylene material.

[0139] The raw materials and the preparation method of the light-transmitting polypropylene material of the present comparative example are basically the same as those of Comparative Example 1, except that the polypropylene is copolymerized polypropylene PP EP548R prepared by Spherizone gas phase process.

[0140] Comparative Example 3

[0141] The present comparative example provides a light-transmitting polypropylene material.

[0142] The preparation method of the light-transmitting polypropylene material of the present comparative example is basically the same as that of Example 1, except that the raw materials of the light-transmitting polypropylene material are, in parts by mass:

[0143] Comparative Example 4

[0144] The present comparative example provides a light-transmitting polypropylene material.

[0145] The preparation method of the light-transmitting polypropylene material of the present comparative example is basically the same as that of Example 1, except that the raw materials of the light-transmitting polypropylene material are, in parts by mass:

[0146] Metallocene random polypropylene 70 parts;

[0147] Ethylene-1-butene elastomer 10 parts;

[0148] Fluorophlogopite powder 18 parts;

[0149] Antioxidant aid 0.5 parts;

[0150] Light stabilizer 0.5 parts; and

[0151] Lubricating aid 1 part.

[0152] Comparative Example 5

[0153] The present comparative example provides a light-transmitting polypropylene material.

[0154] The preparation raw materials and the preparation method of the light-transmitting polypropylene material of the present comparative example are basically the same as those of Comparative Example 4, except that the preparation raw materials of the light-transmitting polypropylene material contain 18 parts of ethylene-1-butene elastomer and 10 parts of fluorphlogopite powder by mass fraction.

[0155] Comparative Example 6

[0156] The present comparative example provides a light-transmitting polypropylene material.

[0157] The preparation method of the light-transmitting polypropylene material of the present comparative example is basically the same as that of Example 1, except that the preparation raw materials of the light-transmitting polypropylene material are as follows by mass fraction:

[0158] 70 parts of metallocene random polypropylene;

[0159] 10 parts of ethylene-1-octene elastomer;

[0160] 18 parts of fluorphlogopite powder;

[0161] 0.5 parts of antioxidant aid;

[0162] 0.5 parts of light stabilizer; and

[0163] 1 part of lubricating aid.

[0164] Comparative Example 7

[0165] The present comparative example provides a light-transmitting polypropylene material.

[0166] The preparation raw materials and the preparation method of the light-transmitting polypropylene material of the present comparative example are basically the same as those of Comparative Example 6, except that the preparation raw materials of the light-transmitting polypropylene material contain 18 parts of ethylene-1-octene elastomer and 10 parts of fluorphlogopite powder by mass fraction.

[0167] Comparative Example 8

[0168] The present comparative example provides a light-transmitting polypropylene material.

[0169] The preparation raw materials and the preparation method of the light-transmitting polypropylene material of the present comparative example are basically the same as those of Example 3, except that the preparation raw materials of the light-transmitting polypropylene material contain 10 parts of talc powder by mass fraction.

[0170] Comparative Example 9

[0171] The present comparative example provides a light-transmitting polypropylene material.

[0172] The preparation raw materials and the preparation method of the light-transmitting polypropylene material of the present comparative example are basically the same as those of Example 3, except that the preparation raw materials of the light-transmitting polypropylene material contain 10 parts of calcium carbonate by mass fraction, and do not contain fluoromica powder.

[0173] Comparative Example 10

[0174] The present comparative example provides a light-transmitting polypropylene material.

[0175] The preparation raw materials and the preparation method of the light-transmitting polypropylene material of the present comparative example are basically the same as those of Example 3, except that the preparation raw materials of the light-transmitting polypropylene material contain 10 parts of barium sulfate by mass fraction, and do not contain fluoromica powder.

[0176] The preparation raw materials of the light-transmitting polypropylene material of the above examples and comparative examples can be seen from the description of Table 1 and Table 2.

[0177] Table 1 Preparation raw materials of the light-transmitting polypropylene material of the examples

[0178]

[0179] Table 2 Preparation raw materials of the light-transmitting polypropylene material of the comparative examples

[0180]

[0181] Test Example

[0182] The mechanical properties, light-transmitting properties and haze of the light-transmitting polypropylene materials of the examples and comparative examples are tested, and the test results are shown in Table 3 and Table 4.

[0183] Table 3 Performance test results of the examples

[0184]

[0185] Table 4 Performance test results of the comparative examples

[0186]

[0187] The technical features of the above examples can be combined in any way, and for the sake of brevity, not all possible combinations of the technical features in the above examples are described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present description.

[0188] The above embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the application, several modifications and improvements can be made, which are all within the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims, and the description can be used to explain the content of the claims.

Claims

1. A light-transmitting polypropylene material, characterized by, The preparation raw materials of the light-transmitting polypropylene material include, in parts by weight: a metallocene random polypropylene 60-70 parts; a propylene ethylene copolymer elastomer 10-20 parts; and mica powder 10-20 parts.

2. The light-transmissive polypropylene material according to claim 1, characterized in that The polydispersity coefficient of the metallocene random polypropylene is 1.5-2.5; and / or The 2.5mm light transmittance of the metallocene random polypropylene under D65 light source is 80%-90%, and the haze is 35%-45%.

3. The light-transmissive polypropylene material according to claim 1, characterized in that The melt index of the propylene ethylene copolymer elastomer under 2.16kg and 230℃ is 10g / 10min-20g / 10min.

4. The light-transmissive polypropylene material according to claim 1, characterized in that, The mica powder includes phengite fluorophlogopite powder; and / or The D50 of the mica powder is 5-50μm.

5. The light-transmissive polypropylene material according to any one of claims 1 to 4, characterized in that The mass ratio of the propylene ethylene copolymer elastomer to the mica powder is 5:(2-5).

6. The light-transmissive polypropylene material according to any one of claims 1 to 4, characterized in that The preparation raw materials of the light-transmitting polypropylene material further include, in parts by weight: an antioxidant 0.3-0.5 parts; a light stabilizer 0.3-0.5 parts; a lubricating aid 0.3-1 part.

7. The light-transmissive polypropylene material according to claim 6, characterized in that The light stabilizer includes one or more of hindered amine light stabilizers and ultraviolet absorption light stabilizers; and / or The lubricating aid includes metal soap lubricating aids; and / or The antioxidant includes one or more of hindered phenol antioxidants, phosphite antioxidants and thioester antioxidants.

8. A process for the preparation of a light-transmitting polypropylene material according to any one of claims 1 to 7, characterized in that The preparation raw materials of the light-transmitting polypropylene material are mixed according to the proportions to form a mixture; The mixture is melt blended and extrusion granulated. The temperature of the melt blending is 150-220℃, and the temperature of the extrusion granulation is 200-230℃.

9. The method for preparing the translucent polypropylene material according to claim 8, characterized in that, The light-transmitting polypropylene material of any one of claims 1-7 is included.

10. An automotive bumper characterized by, ​

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