Carbon black masterbatch, polypropylene compound, and method of making and use thereof

Abstract

The present application discloses a carbon black master batch, a polypropylene compound and a preparation method and use thereof. The carbon black master batch comprises the following components in parts by weight: 10-20 parts of carbon black, 10-20 parts of mesoporous substance, 10-20 parts of polar talc, 40-70 parts of maleic anhydride graft, and 0.2-1 parts of auxiliary antioxidant; the D50 particle size of the carbon black is ≤20 nm, and the oil absorption value of the carbon black is ≤100 cm 3 / 100 g. Further, the present application also claims a polypropylene compound added with the carbon black master batch. The carbon black master batch has excellent dispersion capacity, is more uniformly distributed at the flow front and inside the resin matrix melt, and when the polypropylene melt converges, is turbulent and collides, the generation of color stripes is further avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of modified plastics, and more particularly relates to a carbon black master batch, a polypropylene composite and a preparation method and use thereof. BACKGROUND

[0002] Polypropylene has the advantages of small density, low price, easy processing, etc., and has been widely used in the automotive industry. In recent years, with the intensification of competition in the automotive industry, especially the rapid development of new energy vehicles, the design of structure and color of interior and exterior parts of vehicles has brought unprecedented changes, such as integrated design, gradual wall thickness, novel skin pattern, and bright colors begin to be used on the interior and exterior of vehicles. These new designs and colors bring a new experience to consumers, but they are often prone to various appearance defects, one of which is color striping, which is difficult to solve by existing methods, which poses new challenges to the traditional material formula design and molding performance of vehicles.

[0003] There are many reasons for color striping, such as polypropylene melt butt joint color striping, polypropylene melt flow disorder leading to color striping, polypropylene convergence caused by mold multi-gate, wall thickness variation, hole, etc. For the first kind, there are related patents for research, such as patent CN107459705A, which studies the melt joint color difference of high light polypropylene. By adding a higher flowability random copolymer polypropylene than the base polypropylene, the distribution width of the molecular weight of the polypropylene is widened, the molecular chain is promoted to interpenetrate and entangle when the front end of the flow is welded, and a better welding effect is obtained. In addition, high flow polybutene-1 has good compatibility and melt dispersibility with polypropylene, and a lower melting point. Its linear molecules are beneficial to interpenetration in the base resin, and are beneficial to the lubrication and dispersion of inorganic particles during the welding process, effectively avoiding the accumulation of inorganic particles to form color stripes or scratches.

[0004] For flow disorder, existing patents mainly study flow marks, such as patent CN112679842A, which mainly studies tiger stripes in flow marks. By adding a small amount of specific high molecular weight homopolymer polypropylene to the polypropylene composition system to improve the melt elasticity, the material surface flow mark problem is fundamentally solved. For color striping caused by flow disorder, there is no patent for research.

[0005] At present, in a large number of applications, it is found that the main reason for color strip generation is that the color powder is not uniformly dispersed in the polypropylene melt, which can be solved by adding a color powder dispersant, strengthening the dispersion capacity of the processing equipment, selecting a specially treated color powder, and improving the melt flow path. However, in the current application of new design and new color of the car, there is a special case, no matter what color, such as brown, blue, green, beige, gray, etc., carbon black must be added in the color powder formula for color adjustment, and when the content of carbon black is ≤4 ‰, the above-mentioned color strip phenomenon is prone to occur. How to improve the color strip phenomenon caused by the carbon black color adjustment has become a technical problem to be solved. SUMMARY

[0006] In view of the above technical problems, the primary object of the present application is to provide a carbon black master batch.

[0007] The second object of the present application is to provide a preparation method of the carbon black master batch.

[0008] The third object of the present application is to provide the use of the carbon black master batch in the preparation of polypropylene composite or in the field of automobiles.

[0009] The fourth object of the present application is to provide a polypropylene composite.

[0010] The fifth object of the present application is to provide a preparation method of the polypropylene composite.

[0011] The sixth object of the present application is to provide the use of the polypropylene composite in the field of automobiles.

[0012] In order to achieve the above objects, the present application is realized by the following technical scheme:

[0013] A carbon black master batch, by weight fraction, comprises the following components: 10-20 parts of carbon black, 10-20 parts of mesoporous material, 10-20 parts of polar talc, 40-70 parts of maleic anhydride graft, 0.2-1 parts of auxiliary antioxidant; the D50 particle size of the carbon black is ≤20 nm, and the oil absorption value of the carbon black is ≤100 cm 3 / 100g.

[0014] The inventor found through research that the main reason for the color strip generation is that the trace carbon black is distributed differently in the front end of the polypropylene melt flow and the inside of the melt due to the difference in polarity, and when the polypropylene melt converges, is turbulent, and collides, color strips are generated.

[0015] Therefore, in the present application, the high pigment carbon black with a specific particle size and oil absorption value is used to replace the conventional carbon black, and the high pigment carbon black has the characteristics of small particle size and easy dispersion, which increases the dispersion capacity of the carbon black, reduces the distribution gradient problem of the carbon black in the resin matrix, and further better avoids the generation of color stripes.

[0016] Further, the maleic anhydride grafting agent is also added in the carbon black master batch in the present application, and the maleic anhydride grafting agent is more easily distributed in the front end and surface layer of the resin matrix melt, and based on the interaction of polarity and non-polarity, the polar talc can be distributed to the front end and surface layer of the resin matrix melt, and the carbon black content at the position is diluted, and the generation of color stripes is better avoided. The polarity of the talc can solve the problem of polarity distribution in the polypropylene melt, and reduce the aggregation of the carbon black in the front end and surface layer of the melt.

[0017] Further, the mesoporous substance is used to mix with the carbon black in the present application, and it is speculated that the mesoporous substance can adsorb the carbon black, so that the carbon black is more uniformly distributed in the resin matrix melt; in addition, the adsorption of the mesoporous substance can also destroy the agglomeration of the carbon black particles. Through adsorption and destruction of the agglomeration of the carbon black particles, the carbon black is uniformly dispersed in the resin matrix melt, and the generation of color stripes is avoided. In addition, the auxiliary antioxidant is also added in the carbon black master batch in the present application, and the auxiliary antioxidant can reduce the degradation of the carbon black master batch.

[0018] The present application provides a kind of carbon black master batch, by using specific particle size and oil absorption value of carbon black, mesoporous substance, polar talc, auxiliary antioxidant and maleic anhydride grafting agent, so that the carbon black master batch prepared has excellent dispersion capacity, and is more evenly distributed in the flow front end of resin matrix melt and melt interior, when polypropylene melt occurs convergence, disorder, and collides, and the generation of color stripes is better avoided.

[0019] Preferably, the D50 particle size of the carbon black is 7-20 nm. More specifically, the D50 particle size of the carbon black is 13-19 nm. Specifically, the D50 particle size of the carbon black in the present application can be 7 nm, 9 nm, 13 nm, 15 nm, 16 nm, 19 nm, etc., or an interval range formed by any of the above values, such as 7-13 nm, 15-20 nm, etc., and the present application is not limited thereto. More specifically, the test method for the D50 particle size of the carbon black is GB / T3780.17-2017.

[0020] Preferably, the oil absorption value of the carbon black is 40-100 cm 3 / 100g. More specifically, the oil absorption value of the carbon black is 46-98 cm 3 / 100g. Specifically, the oil absorption value of the carbon black in the present application can be 41 cm 3 / 100g, 46 cm 3 / 100g, 57 cm / 100g, 57 cm3 / 100g, 61 cm 3 / 100g, 69 cm 3 / 100g, 98 cm 3 / 100g, etc., or an interval range formed by any of the above values, such as 40-50 cm 3 / 100g, 66-72 cm 3 / 100g, etc. The present application is not limited thereto. More specifically, the test method for the oil absorption value of the carbon black is GB / T 3780.2-2017.

[0021] Preferably, the pore size of the mesoporous substance is 2-13 nm; and / or

[0022] The mesoporous substance is selected from one or more of zeolite, diatomite, molecular sieve, and mesoporous carbon.

[0023] Preferably, the pore size of the mesoporous substance is 6-12 nm. More specifically, the pore size of the mesoporous substance is 8-10 nm. Within this preferred range, the number of color stripes can be better reduced and the visibility of color stripes can be reduced. The test method for the pore size of the mesoporous substance is to use nitrogen as the adsorbent, use TriStar II plus 3030, and follow the national standard GB / T 21650.2-2008 to test the pore size of the mesoporous substance.

[0024] Preferably, the polar talc powder is an organic carboxylic acid-coated modified talc powder; and / or

[0025] The D50 particle size of the polar talc powder is ≤18 μm.

[0026] Preferably, the D50 particle size of the polar talc powder is 1-11 μm. Further preferably, the D50 particle size of the polar talc powder is 1.5-4 μm. Specifically, the D50 particle size of the polar talc powder in the present application can be 2.7 μm, 5 μm, 11 μm, etc., or an interval range formed by any of the above values, such as 2-4 μm, 5-7 μm, etc. The present application is not limited thereto. More specifically, the test method for the D50 particle size of the polar talc powder is GB / T 15344-2012.

[0027] Preferably, in the organic carboxylic acid-coated modified talc powder, the content of the organic carboxylic acid is 0.4-1.2 wt%. Further preferably, the content of the organic carboxylic acid is 0.8-1.0 wt%. Within this preferred range, the number of color stripes can be better reduced and the visibility of color stripes can be reduced.

[0028] Preferably, the organic carboxylic acid is selected from a maleic acid-acrylic acid copolymer.

[0029] Preferably, the preparation method of the organic carboxylic acid coated modified talc powder is as follows: the talc powder is mixed with a solvent, then maleic acid-acrylic acid copolymer is added and uniformly mixed, and dried to obtain the organic carboxylic acid coated modified talc powder.

[0030] Preferably, the maleic anhydride grafting is selected from one or more of maleic anhydride grafted polypropylene, maleic anhydride grafted POE; and / or

[0031] The melt flow rate of the maleic anhydride grafting at 230℃, 2.16Kg is 3-120g / 10min; and / or

[0032] The grafting rate of the maleic anhydride grafting is 0.5-1.5%.

[0033] Specifically, the maleic anhydride grafted polypropylene can be maleic anhydride grafted homopolymer polypropylene and / or maleic anhydride grafted copolymer polypropylene.

[0034] Specifically, the test method of the melt flow rate of the maleic anhydride grafting is GB / T 3682-2018. The test method of the grafting rate of the maleic anhydride grafting is acid-base neutralization titration method.

[0035] Preferably, the auxiliary antioxidant is a phosphite antioxidant. More specifically, the phosphite antioxidant includes but is not limited to tris[2.4-di-tert-butylphenyl] phosphite, bis(2,4-di-tert-butylphenol) pentaerythritol diphosphite, 3,9-bis(2,4-dicumylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, etc.

[0036] Further, the present application claims to protect a preparation method of a carbon black master batch, comprising the following steps: mixing carbon black and mesoporous material, then adding polar talc powder, maleic anhydride grafting and auxiliary antioxidant, uniformly mixing, granulating to obtain the carbon black master batch.

[0037] Further, the present application claims to protect a polypropylene composite, comprising the following components by weight fraction: 28-100 parts of polypropylene resin, 0.1-2 parts of the carbon black master batch, 0-1 parts of antioxidant, 0-0.5 parts of light stabilizer, 0-0.5 parts of lubricant, 0-10 parts of polyethylene resin, 0-30 parts of elastomer, and 0-30 parts of mineral powder.

[0038] Further, the present application claims to protect a polypropylene composite, comprising the following components by weight fraction: 28-100 parts of polypropylene resin, 0.1-2 parts of the carbon black master batch, 0.2-1 parts of antioxidant, 0.1-0.5 parts of light stabilizer, 0.1-0.5 parts of lubricant, 0-10 parts of polyethylene resin, 0-30 parts of elastomer, and 0-30 parts of mineral powder.

[0039] Further, the present application claims a polypropylene composite, comprising the following components by weight fraction: polypropylene resin 28-100 parts, the carbon black master batch 0.1-2 parts, antioxidant 0.2-1 part, light stabilizer 0.1-0.5 part, lubricant 0.1-0.5 part, polyethylene resin 2-10 parts, elastomer 10-30 parts, mineral powder 20-30 parts.

[0040] Specifically, the amount of antioxidant in the present application is 0.4 parts, 0.6 parts, 0.8 parts, etc., or an interval range formed by any of the above values; specifically, the amount of light stabilizer in the present application is 0.2 parts, 0.3 parts, 0.4 parts, etc., or an interval range formed by any of the above values; specifically, the amount of lubricant in the present application is 0.2 parts, 0.3 parts, 0.4 parts, etc., or an interval range formed by any of the above values; specifically, the amount of polyethylene resin in the present application is 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or an interval range formed by any of the above values; specifically, the amount of elastomer in the present application is 15 parts, 18 parts, 20 parts, 23 parts, 25 parts, 27 parts, etc., or an interval range formed by any of the above values; specifically, the amount of mineral powder is 22 parts, 24 parts, 26 parts, 28 parts, etc., or an interval range formed by any of the above values.

[0041] Preferably, the mass percentage of polypropylene resin in the polypropylene composite is not less than 28%. Further preferably, the mass percentage of polypropylene resin in the polypropylene composite is not less than 70%.

[0042] Preferably, the polypropylene resin is one or more of copolymerized polypropylene, homopolymerized polypropylene. Further preferably, the polypropylene resin is homopolymerized polypropylene. In this preferred case, the polypropylene composite prepared has fewer color stripes and lower color stripe visibility.

[0043] Preferably, the melt flow rate of the polypropylene resin under the condition of 230℃, 2.16Kg is 2-100g / 10min. Specifically, the melt flow rate of the polypropylene resin under the condition of 230℃, 2.16Kg is 2.6-90g / 10min. Specifically, the melt flow rate of the polypropylene resin in the present application can be 10g / 10min, 30g / 10min, 60g / 10min, 90g / 10min, etc., or an interval range formed by any of the above values, such as 5-25g / 10min, 45-75g / 10min, etc., and the present application is not limited thereto. Specifically, the test method for the melt flow rate of the polypropylene resin is GB / T 3682-2018.

[0044] Preferably, the polyethylene resin is one or more of high density polyethylene (HDPE), low density polyethylene (LDPE).

[0045] Preferably, the polyethylene resin has a melt flow rate of 2-17 g / 10 min at 190℃, 2.16 Kg. Specifically, the test method for the melt flow rate of the polyethylene resin is GB / T 3682-2018.

[0046] Preferably, the elastomer is polyolefin elastomer (POE). The elastomer has a melt flow rate of 0.3-17 g / 10 min at 190℃, 2.16 Kg. The test method for the melt flow rate of the elastomer is GB / T 3682-2018.

[0047] Preferably, the mineral powder can be one or more of talc powder, whisker, mica. The D50 particle size of the mineral powder is ≤18 μm. Preferably, the D50 particle size of the mineral powder is 1-11 μm. Preferably, the D50 particle size of the mineral powder is 1.5-4 μm.

[0048] Preferably, the lubricant is selected from one or more of amide lubricant, stearic acid lubricant, fatty acid lubricant.

[0049] Preferably, the primary antioxidant is hindered phenolic antioxidant. Specifically, the hindered phenolic antioxidant includes but is not limited to tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, etc.

[0050] The light stabilizer includes but is not limited to nickel dibutyldithiocarbamate, bis-2,2,6,6-tetramethylpiperidinyl sebacate (light stabilizer 770), poly{[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-[(2,2,6,6,-tetramethyl-4-piperidyl)imino]-1,6-hexanediy[(2,2,6,6-tetramethyl-4-piperidyl)imino]} etc. Preferably, the light stabilizer is hindered amine light stabilizer.

[0051] Further, the present application claims protection to a method for preparing a polypropylene composite, mixing polypropylene resin, carbon black master batch and other substances contained in the polypropylene composite, melt extruding and granulating, to obtain the polypropylene composite.

[0052] Preferably, the extrusion is performed using a twin-screw extruder having a length to diameter ratio of 36-48:1.

[0053] Preferably, the temperature of melt extrusion is 180-230℃, and the vacuum degree of melt extrusion is ≤-0.1MPa.

[0054] Preferably, the screw rotation speed of the twin-screw extruder is 300-700rpm.

[0055] Further, the present application claims a use of the polypropylene composite in the field of automobile. Specifically, the polypropylene composite is suitable for preparing door panel, upright column, bumper, etc., especially for occasions with higher appearance requirements.

[0056] Compared with the prior art, the present application has the following beneficial effects:

[0057] The present application provides a carbon black master batch, by using carbon black with specific particle size and oil absorption value, and by matching mesoporous substance, polar talc, auxiliary antioxidant and maleic anhydride graft, the prepared carbon black master batch has excellent dispersion capacity, and is more evenly distributed in the flow front and the internal melt of the resin matrix melt, and when the polypropylene melt converges, is turbulent, and collides, the generation of color stripes is further avoided. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 Part of the appearance of the polypropylene composite prepared for Comparative Example 4. DETAILED DESCRIPTION

[0059] The present application is further illustrated in conjunction with the specification and specific examples, but the examples do not limit the present application in any form. Unless otherwise specified, the reagents, methods and equipment used in the present application are conventional reagents, methods and equipment in the technical field.

[0060] The raw materials of the examples and comparative examples are as follows:

[0061] Polypropylene resin 1: homopolymer polypropylene resin, PP T30S, the melt flow rate under the condition of 230℃ and 2.16kg is 2.6g / 10min, Lanzhou Petrochemical.

[0062] Polypropylene resin 2: homopolymer polypropylene resin, PP Y26, the melt flow rate under the condition of 230℃ and 2.16kg is 26g / 10min, Zhenhai Refining and Chemical.

[0063] Polypropylene resin 3: copolymer polypropylene resin, PP BX3900, the melt flow rate under the condition of 230℃ and 2.16kg is 60g / 10min, SK of South Korea.

[0064] Polypropylene resin 4: Copolymerized polypropylene resin, PP BX3920, melt flow rate at 230°C, 2.16kg condition, 90g / 10min, SK, Korea.

[0065] Maleic anhydride grafted polypropylene: LEP-1B, grafting rate of maleic anhydride, 1.0%, Shenyang Ketong.

[0066] Carbon black 1: P45, D50 particle size, 13nm, oil absorption value, 46cm 3 / 100g, Tianjin Jindadi.

[0067] Carbon black 2: C111, D50 particle size, 15nm, oil absorption value, 98cm 3 / 100g, Tianjin Jindadi.

[0068] Carbon black 3: SM100, D50 particle size, 19nm, oil absorption value, 69cm 3 / 100g, Tianjin Jindadi.

[0069] Carbon black 4: S666, D50 particle size, 28nm, oil absorption value, 70cm 3 / 100g, Tianjin Jindadi.

[0070] Carbon black 5: C126, D50 particle size, 16nm, oil absorption value, 115cm 3 / 100g, Tianjin Jindadi.

[0071] Primary antioxidant: 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione, antioxidant 1790, commercially available.

[0072] Secondary antioxidant: Tris[2.4-di-tert-butylphenyl] phosphite, antioxidant 168, commercially available.

[0073] Light stabilizer: Poly{[6-[(1,1,3,3-tetramethylbutyl)amino]]-1,3,5-triazine-2,4-[(2,2,6,6,-tetramethyl-piperidyl)imino]-1,6-hexanediy[(2,2,6,6-tetramethyl-4-piperidyl)imino]}, commercially available.

[0074] Lubricant: Zinc stearate, commercially available.

[0075] Mineral powder: Talc powder, HTP2L, D50 particle size, 2.4μm, Italy.

[0076] Polar talc 1, talc HTP2L was mixed with water, then maleic acid-acrylic acid copolymer (source: Wengjiang Reagent) was added and mixed evenly, and then dried to obtain organic carboxylic acid coated modified talc (the content of organic carboxylic acid accounted for 1wt%).

[0077] Polar talc 2, talc HTP2L was mixed with water, then maleic acid-acrylic acid copolymer (Wengjiang Reagent) was added and mixed evenly, and then dried to obtain organic carboxylic acid coated modified talc (the content of organic carboxylic acid accounted for 0.4wt%).

[0078] Mesoporous material 1: SBA-15 molecular sieve, pore size 10nm, Os Catalyst.

[0079] Mesoporous material 2: MCM-41 molecular sieve, pore size 2nm, Os Catalyst.

[0080] Mesoporous material 3: mesoporous carbon, pore size 6nm, Beikexin Material.

[0081] Elastomer: POE 8150, melt flow rate (MFR) of 0.5g / 10min at 190℃, 2.16Kg, Dow Chemical.

[0082] Unless otherwise specified, each component (such as antioxidant, lubricant) selected in each parallel example and comparative example is the same commercially available product.

[0083] Example 1

[0084] The weight parts of the raw materials used in Example 1 are shown in Table 1.

[0085] A carbon black master batch, the specific steps comprising:

[0086] The carbon black and mesoporous material were mixed and ground, then the polar talc, maleic anhydride grafted polypropylene, and auxiliary antioxidant were added to the internal mixer and mixed evenly, and then granulated to obtain a carbon black master batch.

[0087] A polypropylene composite, the specific steps comprising:

[0088] The polypropylene, polyethylene, elastomer, and talc were added to the mixer and mixed evenly, then the above-mentioned carbon black master batch was added and mixed evenly, and then added to the main feeding port of the twin-screw extruder for melt blending, vacuum extrusion granulation (temperature 200℃, vacuum degree-0.1MPa, screw rotation speed 600rpm, length-diameter ratio 44:1), to obtain a polypropylene composite.

[0089] Examples 2-16

[0090] The weight parts of the raw materials used in each of the following examples are shown in Table 1.

[0091] The specific preparation steps of each of the following examples are the same as those of Example 1.

[0092] Comparative Examples 1-6

[0093] The weight parts of the raw materials used in each of the following comparative examples are shown in Table 2.

[0094] The specific preparation steps of each of the other comparative examples are the same as those of Example 1.

[0095] Table 1

[0096]

[0097]

[0098] Table 2 is the formula components of each of the comparative examples:

[0099] Table 2

[0100]

[0101] The polypropylene compounds prepared in the above examples and comparative examples were injection molded to prepare test bars, the size of the test bars was 350*100mm, and the appearance was evaluated, and the evaluation criteria are shown in Table 3.

[0102] Table 3

[0103]

[0104]

[0105] Table 4 is the performance test results of each of the examples and comparative examples.

[0106] Table 4

[0107]

[0108] As can be seen from the example data, the carbon black master batch provided by the application has excellent dispersion capacity, and is more evenly distributed in the flow front and the interior of the resin matrix melt. When the polypropylene melt converges, becomes turbulent, and collides, the generation of color stripes is better avoided. The number of color stripes of the polypropylene compound added with the carbon black master batch is ≤N1, and the color stripe visibility is ≤K1.

[0109] As can be seen from Examples 8 to 11, compared with using copolymerized polypropylene as the base resin, the polypropylene compound prepared using homopolymerized polypropylene has fewer color stripe numbers and lower color stripe visibility.

[0110] As can be seen from Example 8, Example 12 and Example 13, when the particle size of the carbon black is smaller or the oil absorption value of the carbon black is smaller, the polypropylene composite prepared has less number of color streaks and lower color streak visibility.

[0111] As can be seen from Example 8, Example 14 and Example 15, both molecular sieve and mesoporous carbon can be used as the mesoporous substance of the carbon black master batch of the present application, and when the pore size of the molecular sieve is about 10 nm, the polypropylene composite prepared has less number of color streaks and lower color streak visibility.

[0112] As can be seen from Example 1 and Comparative Example 1, when the components are added in the form of a master batch to prepare the polypropylene composite, the polypropylene composite prepared has more excellent effect.

[0113] As can be seen from Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4, when the maleic anhydride grafted polypropylene, the polar talc or the mesoporous substance is absent in the carbon black master batch, it is difficult to achieve the technical effect of the present application. As shown in the partial appearance diagram of the polypropylene composite prepared in Comparative Example 4, the color streaks are indicated by the arrows in the diagram, and it can be seen that the surface of the prepared polypropylene composite has obvious color streaks, which can be seen by the naked eye. Figure 1

[0114] As can be seen from Example 1, Comparative Example 5 and Comparative Example 6, when the particle size or the oil absorption value of the carbon black is not within the specific range, it is difficult to achieve the technical effect of the present application.

[0115] The foregoing examples are illustrative only and are not meant to limit the scope of the application as described. The appended claims are intended to claim as broad a range as possible given the nature of the application. The examples presented herein are presented to demonstrate the application of the principles of the application to actual testing. Accordingly, the applicant intends that the appended claims not be limited to the choice of examples presented herein as examples of the features of the application. Some numerical ranges are presented in the claims using the language "between X and Y." This language is intended to include the endpoints of the range as well as the range itself.​

Claims

1. A carbon black masterbatch, characterized in that, By weight parts, including the following components: carbon black 10-20 parts, mesoporous material 10-20 parts, polar talc 10-20 parts, maleic anhydride grafting 40-70 parts, auxiliary antioxidant 0.2-1 parts; The carbon black has a D50 particle size of ≤ 20 nm, and an oil absorption number of ≤ 100 cm3 / 100 g. 3 / 100g.

2. The carbon black master batch of claim 1, characterized in that, The pore size of the mesoporous material is 2-13 nm; and / or The mesoporous material is selected from one or more of zeolite, diatomite, molecular sieve, mesoporous carbon.

3. The carbon black master batch of claim 1, characterized in that, The polar talc is an organic carboxylic acid coated modified talc; and / or The D50 particle size of the polar talc is ≤18 μm.

4. The carbon black masterbatch of claim 3, wherein The content of the organic carboxylic acid in the organic carboxylic acid coated modified talc is 0.4-1.2 wt%.

5. The carbon black master batch of claim 1, characterized in that, The maleic anhydride grafting is selected from one or more of maleic anhydride grafted polypropylene, maleic anhydride grafted POE; and / or The melt flow rate of the maleic anhydride grafting at 230°C, 2.16 Kg is 3-120 g / 10 min; and / or The grafting rate of the maleic anhydride grafting is 0.5-1.5%.

6. A process for the preparation of the carbon black masterbatch according to any one of claims 1 to 5, characterized in that, The carbon black and mesoporous material are mixed, then the polar talc, maleic anhydride grafting and auxiliary antioxidant are added and mixed uniformly, granulated to obtain the carbon black master batch.

7. Use of the carbon black master batch of any one of claims 1-5 in the preparation of a polypropylene composite or in the automotive field.

8. A polypropylene compound, characterized in that, By weight parts, including the following components: polypropylene resin 28-100 parts, the carbon black master batch of any one of claims 1-5 0.1-2 parts, antioxidant 0-1 parts, light stabilizer 0-0.5 parts, lubricant 0-0.5 parts, polyethylene resin 0-10 parts, elastomer 0-30 parts, mineral powder 0-30 parts.

9. Process for the production of the polypropylene compound according to claim 8, characterized in that, The polypropylene resin, carbon black master batch and other substances contained in the polypropylene composite are mixed, melt extruded and granulated to obtain the polypropylene composite.

10. Use of the polypropylene composite of claim 9 in the automotive field.

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