Polypropylene composite material, and preparation method and application thereof

Abstract

The application relates to the technical field of high polymer composite materials, and discloses a polypropylene composite material, a preparation method thereof and application. The polypropylene composite material comprises the following preparation raw materials: polypropylene resin I, polypropylene resin II, a toughening agent, inorganic fillers and a foaming agent; the melt index of the polypropylene resin I under a test condition of 230 DEG C / 2.16 kg is 1 g / 10 min-100 g / 10 min; and the melt index of the polypropylene resin II under a test condition of 230 DEG C / 2.16 kg is 500 g / 10 min-2000 g / 10 min. The polypropylene composite material provided by the application has the following properties after being injection molded: 60 DEG glossiness is less than or equal to 1.3, impact strength is greater than 20 KJ / m 2 , odor grade is less than or equal to 3.5, glossiness is low, odor is low, and the requirements of automobile interior components can be met, and the polypropylene composite material can be applied to the preparation of automobile interior parts.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high polymer composite materials, in particular to a polypropylene composite material and a preparation method and application thereof. BACKGROUND

[0002] Polypropylene is widely used in the automotive industry, especially in automotive interior and exterior decoration materials, due to its good processing performance and physical and chemical properties. The automotive interior parts, especially the instrument panel, occupy a large part of the driver's field of view. The instrument panel made of high-gloss materials is prone to body reflection during driving, and the reflection is also mapped on the front windshield, causing driver visual fatigue and threatening driving safety. Therefore, reducing the glossiness of automotive interior parts is of great significance to improving driving safety.

[0003] The surfaces of the commonly used automotive interior parts such as instrument panels, door panels, and auxiliary instrument panels are etched with specific skin patterns. In addition to the functions of beauty and flaw concealment, the fine skin structure on the surface greatly increases the surface roughness and reduces the surface gloss compared with the smooth surface. The factors affecting the gloss of the skin surface include not only the structure of the skin itself but also the injection molding process and the inherent properties of the material.

[0004] CN 102807703 A discloses a low-gloss polypropylene composition and a preparation method thereof. The gloss of the polypropylene material is reduced by adding a matting agent mainly composed of powdered rubber and grafted polypropylene. However, this type of matting agent generally has a strong odor and is not suitable for use in the preparation of automotive interior parts. CN 109679226 A discloses a low-gloss, low-odor, seamless airbag instrument panel polypropylene composite material and a preparation method thereof. The gloss of the polypropylene material is reduced by adding a matting agent masterbatch containing inorganic fibers. Since inorganic fibers have poor compatibility with polypropylene, they can easily cause fiber floating on the surface of the parts, affecting the aesthetic effect of the parts. SUMMARY

[0005] The present application aims to solve at least one of the above-mentioned technical problems in the prior art. To this end, one of the objects of the present application is to provide a polypropylene composite material; the second object of the present application is to provide a preparation method for the polypropylene composite material; and the third object of the present application is to provide an application of the polypropylene composite material.

[0006] To achieve the above-mentioned objects, the technical solution adopted by the present application is as follows:

[0007] The first aspect of the present application provides a polypropylene composite material, which is prepared from the following raw materials: polypropylene resin I, polypropylene resin II, toughening agent, inorganic filler, and color masterbatch.

[0008] the polypropylene resin I has a melt index of 1 g / 10 min-100 g / 10 min under a test condition of 230℃ / 2.16 kg;

[0009] the polypropylene resin II has a melt index of 500 g / 10 min-2000 g / 10 min under a test condition of 230℃ / 2.16 kg.

[0010] In some embodiments of the present application, the polypropylene resin I has a melt index of 20 g / 10 min-50 g / 10 min under a test condition of 230℃ / 2.16 kg.

[0011] In some embodiments of the present application, the polypropylene resin II has a melt index of 1000 g / 10 min-1500 g / 10 min under a test condition of 230℃ / 2.16 kg.

[0012] In some embodiments of the present application, the polypropylene composite material further comprises the following raw materials for preparation: a foaming agent, an antioxidant and a lubricant.

[0013] In some embodiments of the present application, the polypropylene composite material comprises the following raw materials for preparation by mass percentage:

[0014]

[0015] In some embodiments of the present application, the polypropylene composite material comprises the following raw materials for preparation by mass percentage:

[0016]

[0017] In some embodiments of the present application, the polypropylene resin I is selected from at least one of homopolymer polypropylene, ethylene-propylene block copolymer polypropylene.

[0018] In some embodiments of the present application, the polypropylene resin II is prepared by a method comprising the following steps:

[0019] the homopolymer polypropylene is added with 0.05%-1% of bis-tert-butyl peroxide isopropyl benzene by mass percentage, and is melt-extruded at 150-170℃ to obtain the polypropylene resin II;

[0020] the homopolymer polypropylene has a melt index of 20 g / 10 min-30 g / 10 min under a test condition of 230℃ / 2.16 kg.

[0021] In the present application, the use of polypropylene resin II with high melt index (500g / 10min-2000g / 10min, 230℃ / 2.16kg) can enhance the moldability of the polypropylene composite material, allowing the composite material to quickly fill the fine structure of the mold during injection molding, so that the product surface can be maximally and completely replicated to the mold structure. The addition of di-tert-butyl peroxyisopropylbenzene to homopolymer polypropylene to prepare polypropylene resin II has the characteristic of low odor compared with conventional peroxides.

[0022] In some embodiments of the present application, the melt index of the toughening agent under test conditions of 190℃ / 2.16kg is 10g / 10min-40g / 10min.

[0023] In some embodiments of the present application, the melt index of the toughening agent under test conditions of 190℃ / 2.16kg is 30g / 10min-40g / 10min.

[0024] In some embodiments of the present application, the toughening agent is selected from at least one of ethylene-propylene rubber, ethylene-octene copolymer, ethylene-butene copolymer and ethylene-vinyl acetate.

[0025] In the present application, unlike the conventional scheme for preparing low-gloss polypropylene composite materials, an elastomer with a higher melt index (10g / 10min-40g / 10min, 230℃ / 2.16kg) is used as a toughening agent, and the toughening agent is used in conjunction with high-melt-index polypropylene resin II to improve the moldability of the material and enhance the material's ability to replicate the fine structure of the mold.

[0026] In some embodiments of the present application, the inorganic filler is selected from at least one of talc, calcium carbonate, wollastonite, and mica powder.

[0027] In some embodiments of the present application, the color masterbatch is a color masterbatch with polypropylene resin as the carrier.

[0028] In some embodiments of the present application, the color masterbatch has a carbon black content of 20wt%-60wt%.

[0029] In some embodiments of the present application, the foaming agent is selected from at least one of azodicarbonamide, benzenesulfonylurea, and benzene disulfonyl hydrazide.

[0030] In the present application, a small amount of foaming agent is added to the formulation of the polypropylene composite material, so that the foaming agent produces a small amount of gas during the injection molding process of the composite material, forming certain pores inside and on the surface of the melt. The use of pore rupture can enhance the irregularity of the surface of the molded material and reduce the flatness, thereby increasing the diffuse reflection effect of the light on the surface of the molded material and reducing the gloss.

[0031] In some embodiments of the present application, the lubricant is selected from at least one of stearate, silicone masterbatch.

[0032] In some embodiments of the present application, the antioxidant is selected from at least one of hindered phenolic antioxidant, sulfur ester antioxidant, phosphite antioxidant.

[0033] In some embodiments of the present application, the antioxidant is a complex of hindered phenolic antioxidant and phosphite antioxidant.

[0034] In some embodiments of the present application, the mass ratio of the hindered phenolic antioxidant and the phosphite antioxidant is 1:(0.8-1.2).

[0035] In some embodiments of the present application, the hindered phenolic antioxidant is selected from at least one of 2,6-di-tert-butyl-4-methylphenol (BHT), n-octadecyl beta-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (antioxidant 1076), pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010), N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine (antioxidant 1098), tri(2,4-di-tert-butylphenyl)phosphite (antioxidant 168), bisphenol A phosphite, triphenyl phosphite (TPP).

[0036] In some embodiments of the present application, the phosphite antioxidant includes at least one of diphenyl isooctyl phosphite (ODPP), tri[2,4-di-tert-butylphenyl]phosphite (antioxidant 168), bisphenol A phosphite, triphenyl phosphite (TPP).

[0037] The second aspect of the present application provides a preparation method of the polypropylene composite material of the first aspect of the present application, comprising the following steps:

[0038] First, the polypropylene resin I, the polypropylene resin II, the toughening agent and the inorganic filler are mixed, and then the foaming agent, the antioxidant, the lubricant and the color masterbatch are added and mixed to obtain a premix; the premix is melt-mixed by a double-screw extruder, extruded and granulated to obtain the polypropylene composite material.

[0039] In some embodiments of the present application, the rotation speed of mixing the polypropylene resin I, the polypropylene resin II, the toughening agent and the inorganic filler is 800-1500 r / min, and the time is 5-10 min.

[0040] In some embodiments of the present application, the rotation speed of mixing after adding the foaming agent, the antioxidant, the lubricant and the color masterbatch is 800-1500 r / min, and the time is 5-10 min.

[0041] In some embodiments of the present application, the temperature of each feeding section of the twin-screw extruder from the hopper to the die is as follows: the first zone temperature: 160-165℃, the second zone temperature: 160-165℃, the third zone temperature: 160-165℃, the fourth zone temperature: 160-165℃, the fifth zone temperature: 160-170℃, the sixth zone temperature: 170-180℃, the seventh zone temperature: 180-190℃, the eighth zone temperature: 190-200℃, and the ninth zone temperature: 200-210℃.

[0042] In some embodiments of the present application, the temperature of the die head of the twin-screw extruder is 200-210℃.

[0043] In some embodiments of the present application, the rotation speed of the screw of the twin-screw extruder is 300-600r / min.

[0044] The third aspect of the present application provides the use of the polypropylene composite material of the first aspect of the present application in the preparation of automobile interior parts.

[0045] In some embodiments of the present application, the automobile interior parts include an instrument panel, a door panel, and a secondary instrument panel.

[0046] Compared with the prior art, the present application has the following beneficial effects:

[0047] 1) The polypropylene composite material provided by the present application improves the formability of the material by adding a polypropylene resin base material with a melt index of 500g / 10min-2000g / 10min (230℃ / 2.16kg), so that the polypropylene composite material can quickly fill the fine structure of the mold skin when injection molding parts, and the surface of the plastic product can be completely replicated to the skin structure to the greatest extent, thereby reducing the surface gloss of the plastic product.

[0048] 2) The polypropylene composite material provided by the present application improves the replication ability of the polypropylene composite material to the mold skin by using a toughening agent with a melt index of 10g / 10min-40g / 10min (230℃ / 2.16kg) to achieve the effect of reducing gloss.

[0049] 3) The polypropylene composite material provided by the present application produces a small amount of gas by foaming during the melting process of injection molding, forms certain pores inside and on the surface of the melt, and the pores on the surface of the part partially break to form an irregular flatness surface effect, thereby increasing the diffuse reflection effect of light on the surface of the part to further reduce the surface gloss of the product.

[0050] 4) The polypropylene composite material preparation method provided by the application has simple steps, mild process conditions and is suitable for industrial application;

[0051] 5) The polypropylene composite material provided by the application has a 60° glossiness of ≤1.3, an impact strength of >20 KJ / m 2 , an odor grade of ≤3.5, low glossiness and low odor, and can meet the requirements of automobile interior components and be applied to the preparation of automobile interior parts. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 The polypropylene composite material in the examples is injection molded into a skin pattern. DETAILED DESCRIPTION

[0053] The content of the application will be further described in detail through specific examples. Unless otherwise specified, the raw materials, reagents or devices used in the examples and comparative examples can be obtained from conventional commercial channels or can be obtained by existing technical methods. Unless otherwise specified, the test or test method is a conventional method in the art.

[0054] The raw material information used in the following examples and comparative examples is shown in Table 1 below:

[0055] Table 1 Raw material information used in the examples and comparative examples

[0056]

[0057]

[0058] Among them:

[0059] 1) The melt index of polypropylene resin I PP EP548R under test conditions of 230℃ / 2.16kg is 26g / 10min;

[0060] 2) The melt index of homopolymer polypropylene PP Z30S under test conditions of 230℃ / 2.16kg is 26g / 10min, and polypropylene resin II is prepared by melt extrusion of homopolymer polypropylene PP Z30S and 0.08wt% of di-tert-butyl peroxyisopropylbenzene at 150-170℃, and the melt index under test conditions of 230℃ / 2.16kg is 1500g / 10min;

[0061] 3) Polypropylene resin III is prepared by melt extrusion of homopolymer polypropylene PP Z30S and 0.08wt% of 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane at 150-170℃, and the melt index under test conditions of 230℃ / 2.16kg is 1400g / 10min;

[0062] 4) The melt index of toughening agent POE8730L is 30 g / 10 min under the test condition of 190℃ / 2.16 kg; the melt index of POE565 is 5 g / 10 min under the test condition of 190℃ / 2.16 kg;

[0063] 5) Color masterbatch XP6622A takes polypropylene resin as carrier, and the content of carbon black is 40wt%.

[0064] Example 1

[0065] In this example, a polypropylene composite material is prepared, and the raw materials are shown in Table 2:

[0066] Table 2 Composition of raw materials for polypropylene composite material in Example 1

[0067]

[0068]

[0069] The preparation method of the polypropylene composite material comprises the following steps:

[0070] First, polypropylene resin I, polypropylene resin II, toughening agent and inorganic filler are stirred and mixed at a speed of 1000 r / min for 10 min, then foaming agent, antioxidant, lubricant and color masterbatch are added, and the stirring and mixing is continued at a speed of 1000 r / min for 10 min to obtain a premix; the premix is added from the main feeding port of the twin-screw extruder, and is melt-mixed, extruded and granulated to obtain the polypropylene composite material, wherein the temperature of each section of the feeding section of the twin-screw extruder is set to 160℃, 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, 200℃, the die temperature is 210℃, and the screw rotation speed is 500 r / min.

[0071] Example 2

[0072] In this example, a polypropylene composite material is prepared, and the raw materials are shown in Table 3:

[0073] Table 3 Composition of raw materials for polypropylene composite material in Example 2

[0074]

[0075] The preparation method of the polypropylene composite material comprises the following steps:

[0076] The polypropylene resin I, the polypropylene resin II, the toughening agent and the inorganic filler are stirred and mixed at a rotating speed of 1000 r / min for 10 min, then the foaming agent, the antioxidant, the lubricant and the color master batch are added, and the stirring and mixing are continuously carried out at a rotating speed of 1000 r / min for 10 min, to obtain a premix; the premix is added from a main feeding port of a twin-screw extruder, and is melt-mixed and extruded and granulated to obtain the polypropylene composite material, wherein the temperature of each section of the feeding section of the twin-screw extruder is set to be 160℃, 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, 200℃, the temperature of the head of the twin-screw extruder is 210℃, and the rotating speed of the screw is 500 r / min.

[0077] Example 3

[0078] In this example, a polypropylene composite material is prepared, and the raw materials are shown in Table 4.

[0079] Table 4 Raw material composition of the polypropylene composite material in Example 3

[0080]

[0081] The polypropylene composite material is prepared by the following steps:

[0082] The polypropylene resin I, the polypropylene resin II, the toughening agent and the inorganic filler are stirred and mixed at a rotating speed of 1000 r / min for 10 min, then the foaming agent, the antioxidant, the lubricant and the color master batch are added, and the stirring and mixing are continuously carried out at a rotating speed of 1000 r / min for 10 min, to obtain a premix; the premix is added from a main feeding port of a twin-screw extruder, and is melt-mixed and extruded and granulated to obtain the polypropylene composite material, wherein the temperature of each section of the feeding section of the twin-screw extruder is set to be 160℃, 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, 200℃, the temperature of the head of the twin-screw extruder is 210℃, and the rotating speed of the screw is 500 r / min.

[0083] Comparative Example 1

[0084] In this example, a polypropylene composite material is prepared, and the raw materials are shown in Table 5.

[0085] Table 5 Raw material composition of the polypropylene composite material in Comparative Example 1

[0086]

[0087]

[0088] The polypropylene composite material is prepared by the following steps:

[0089] The polypropylene resin I, the toughening agent and the inorganic filler are stirred and mixed at a rotating speed of 1000 r / min for 10 min, and then the antioxidant, the lubricant and the color master batch are added and stirred and mixed at a rotating speed of 1000 r / min for 10 min, to obtain a premix; the premix is added from a main feeding port of a twin-screw extruder, melt-mixed, extruded and granulated, to obtain the polypropylene composite material, wherein the temperature of each section of the feeding section of the twin-screw extruder is set to be 160℃, 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, 200℃, the temperature of the head of the twin-screw extruder is 210℃, and the rotating speed of the screw is 500 r / min.

[0090] Comparative Example 2

[0091] The polypropylene composite material of the present comparative example is prepared, and the raw materials are shown in Table 6:

[0092] Table 6 Raw material composition of the polypropylene composite material in Comparative Example 2

[0093]

[0094] The polypropylene composite material is prepared by the following steps:

[0095] The polypropylene resin I, the polypropylene resin II, the toughening agent and the inorganic filler are stirred and mixed at a rotating speed of 1000 r / min for 10 min, and then the antioxidant, the lubricant and the color master batch are added and stirred and mixed at a rotating speed of 1000 r / min for 10 min, to obtain a premix; the premix is added from a main feeding port of a twin-screw extruder, melt-mixed, extruded and granulated, to obtain the polypropylene composite material, wherein the temperature of each section of the feeding section of the twin-screw extruder is set to be 160℃, 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, 200℃, the temperature of the head of the twin-screw extruder is 210℃, and the rotating speed of the screw is 500 r / min.

[0096] Comparative Example 3

[0097] The polypropylene composite material of the present comparative example is prepared, and the raw materials are shown in Table 7:

[0098] Table 7 Raw material composition of the polypropylene composite material in Comparative Example 3

[0099]

[0100] The polypropylene composite material is prepared by the following steps:

[0101] The polypropylene resin I, the polypropylene resin II, the toughening agent and the inorganic filler are stirred and mixed at a rotating speed of 1000 r / min for 10 min, and then the antioxidant, the lubricant and the color master batch are added and stirred and mixed at a rotating speed of 1000 r / min for 10 min, to obtain a premix; the premix is added from a main feeding port of a twin-screw extruder, melt-mixed, extruded and granulated, to obtain the polypropylene composite material, wherein the temperature of each section of the feeding section of the twin-screw extruder is set to be 160℃, 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, 200℃, the temperature of the head of the twin-screw extruder is 210℃, and the rotating speed of the screw is 500 r / min.

[0102] Comparative Example 4

[0103] A polypropylene composite material is prepared in the present comparative example, and the preparation raw materials are shown in Table 8.

[0104] Table 8: Raw material composition of the polypropylene composite material in Comparative Example 4

[0105]

[0106]

[0107] A polypropylene composite material is prepared in the present comparative example, and the preparation raw materials are shown in Table 8.

[0108] The polypropylene resin I, the polypropylene resin II, the toughening agent and the inorganic filler are stirred and mixed at a rotating speed of 1000 r / min for 10 min, and then the antioxidant, the lubricant and the color master batch are added and stirred and mixed at a rotating speed of 1000 r / min for 10 min, to obtain a premix; the premix is added from a main feeding port of a twin-screw extruder, melt-mixed, extruded and granulated, to obtain the polypropylene composite material, wherein the temperature of each section of the feeding section of the twin-screw extruder is set to be 160℃, 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, 200℃, the temperature of the head of the twin-screw extruder is 210℃, and the rotating speed of the screw is 500 r / min.

[0109] Comparative Example 5

[0110] A polypropylene composite material is prepared in the present comparative example, and the preparation raw materials are shown in Table 9.

[0111] Table 9: Raw material composition of the polypropylene composite material in Comparative Example 5

[0112]

[0113] A polypropylene composite material is prepared in the present comparative example, and the preparation raw materials are shown in Table 8.

[0114] The polypropylene resin I, the polypropylene resin II, the toughening agent and the inorganic filler are stirred and mixed at a rotating speed of 1000 r / min for 10 min, and then the antioxidant, the lubricant and the color master batch are added and stirred and mixed at a rotating speed of 1000 r / min for 10 min, to obtain a premix; the premix is added from a main feeding port of a twin-screw extruder, melt-mixed, extruded and granulated, to obtain the polypropylene composite material, wherein the temperature of each section of the feeding section of the twin-screw extruder is set to be 160℃, 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, 200℃, the temperature of the head of the twin-screw extruder is 210℃, and the rotating speed of the screw is 500 r / min.

[0115] Comparative Example 6

[0116] A polypropylene composite material is prepared in the present comparative example, and the preparation raw materials are shown in Table 10.

[0117] Table 10: Raw material composition of the polypropylene composite material in Comparative Example 6

[0118]

[0119] The preparation method of the polypropylene composite material comprises the following steps:

[0120] The polypropylene resin I, the polypropylene resin II, the toughening agent and the inorganic filler are stirred and mixed at a rotating speed of 1000 r / min for 10 min, and then the antioxidant, the lubricant and the color master batch are added and stirred and mixed at a rotating speed of 1000 r / min for 10 min, to obtain a premix; the premix is added from a main feeding port of a twin-screw extruder, melt-mixed, extruded and granulated, to obtain the polypropylene composite material, wherein the temperature of each section of the feeding section of the twin-screw extruder is set to be 160℃, 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, 200℃, the temperature of the head of the twin-screw extruder is 210℃, and the rotating speed of the screw is 500 r / min.

[0121] Comparative Example 7

[0122] A polypropylene composite material is prepared in the present comparative example, and the preparation raw materials are shown in Table 11.

[0123] Table 11: Raw material composition of the polypropylene composite material in Comparative Example 7

[0124]

[0125] The preparation method of the polypropylene composite material comprises the following steps:

[0126] The polypropylene resin I, the polypropylene resin II, the toughening agent and the inorganic filler are stirred and mixed at a rotating speed of 1000 r / min for 10 min, and then the antioxidant, the lubricant and the color master batch are added and stirred and mixed at a rotating speed of 1000 r / min for 10 min, to obtain a premix; the premix is added from a main feeding port of a twin-screw extruder, melt-mixed, extruded and granulated, to obtain the polypropylene composite material, wherein the temperature of each section of the feeding section of the twin-screw extruder is set to be 160℃, 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, 200℃, the temperature of the head of the twin-screw extruder is 210℃, and the rotating speed of the screw is 500 r / min.

[0127] Comparative Example 8

[0128] The polypropylene composite material is prepared by the present comparative example, and the preparation raw materials are shown in Table 12.

[0129] Table 12 Composition of raw materials of the polypropylene composite material in Comparative Example 8

[0130]

[0131]

[0132] The polypropylene composite material is prepared by the present comparative example, and the preparation raw materials are shown in Table 12.

[0133] The polypropylene resin I, the polypropylene resin II, the toughening agent and the inorganic filler are stirred and mixed at a rotating speed of 1000 r / min for 10 min, and then the antioxidant, the lubricant and the color master batch are added and stirred and mixed at a rotating speed of 1000 r / min for 10 min, to obtain a premix; the premix is added from a main feeding port of a twin-screw extruder, melt-mixed, extruded and granulated, to obtain the polypropylene composite material, wherein the temperature of each section of the feeding section of the twin-screw extruder is set to be 160℃, 160℃, 160℃, 160℃, 165℃, 170℃, 180℃, 190℃, 200℃, the temperature of the head of the twin-screw extruder is 210℃, and the rotating speed of the screw is 500 r / min.

[0134] Performance test

[0135] The polypropylene composite materials in Examples 1-3 and Comparative Examples 1-8 are respectively injection molded into a pattern, Figure 1 The polypropylene composite materials in Examples 1-3 and Comparative Examples 1-8 are respectively injection molded into a pattern,

[0136] Gloss: tested according to ISO 2813-2014 “Non-metallic paint films-coating and clear coatings-determination of specular gloss at 20°, 60° and 85°” by the reflection method;

[0137] Impact strength: tested according to ISO 180-2023 "Determination of the Izod Charpy impact strength of plastics";

[0138] Odor: tested according to PV3900-2005 "Odor test for components in the interior of motor vehicles".

[0139] Table 13 Performance test results of polypropylene composite materials in Examples 1-3 and Comparative Examples 1-8

[0140] Test item 60° gloss Impact strength (KJ / m 2 )]]> Odour Example 1 1.3 24 3.2 Example 2 1.1 22 3.1 Example 3 1.0 21 3.2 Comparative Example 1 2.5 42 3.1 Comparative Example 2 2.2 37 3.2 Comparative Example 3 2.0 32 3.1 Comparative Example 4 1.8 28 3.2 Comparative Example 5 1.5 19 3.2 Comparative Example 6 1.7 27 3.1 Comparative Example 7 1.5 26 3.2 Comparative Example 8 1.1 18 3.9

[0141] Table 13 is the performance test results of polypropylene composite materials in Examples 1-3 and Comparative Examples 1-8. As can be seen from Table 13, the polypropylene composite materials prepared in Examples 1-3 have a 60° gloss less than or equal to 1.3, a Charpy impact strength greater than 20 KJ / m 2 , and an odor grade less than or equal to 3.5, all meeting the requirements of the interior components of the motor vehicle cab.

[0142] Comparative Example 1 only uses a common low-melt polypropylene resin base material, and the toughening agent is an elastomer with relatively low melt index. The impact strength of the composite material is high, the odor is small, but the 60° gloss is high, which does not meet the low gloss requirement. In Comparative Example 2, a small amount of high-melt polypropylene resin II is added to Comparative Example 1. The 60° gloss of the material is reduced, but the impact strength is also reduced. In Comparative Examples 3-5, the amount of high-melt polypropylene resin II is further increased. It can be seen that the gloss and impact strength of the composite material are both linearly reduced, indicating that the addition of high-melt polypropylene resin II can improve the moldability of the material, but because the impact strength of high-melt polypropylene resin II is low, when the addition ratio exceeds 16 wt%, the impact performance of the composite material is reduced to 20 KJ / m 2 In Comparative Example 6, the amount of low-melt elastomer toughening agent is reduced based on Comparative Example 4, and part of the high-melt toughening agent is added. It can be seen that the impact strength of the material is basically not affected, and the gloss is slightly reduced. In Comparative Example 7, the low-melt toughening agent is completely replaced by the high-melt toughening agent, and the gloss of the material is significantly reduced, indicating that the high-melt toughening agent has the effect of assisting high-melt polypropylene resin II to improve the moldability of the material. In Examples 1-3, a foaming agent is added based on Comparative Example 7, and with the increase of the amount of foaming agent, the gloss of the material gradually decreases, indicating that the addition of the foaming agent forms certain micropores on the surface of the product, increases the surface roughness of the molded material, and thus increases the diffuse reflection effect of light on the surface of the molded material, reducing the gloss. The difference between Comparative Example 8 and Example 3 is that different peroxides are used to prepare polypropylene resin II, resulting in excessive odor of the material, which cannot meet the requirement of odor ≤3.5 level for interior components of the motor vehicle cab.

Claims

1. A polypropylene composite, characterized in that, By mass percentage, the following raw materials are included: Polypropylene resin I 40%-70%; Polypropylene resin II 5%-20%; Toughening agent 1%-20%; Inorganic filler 5%-25%; Color masterbatch 0.5%-1.5%; Foaming agent 0.1%-1%; Antioxidant 0.1%-1%; Lubricant 1.5%-3%; The polypropylene resin I has a melt index of 1g / 10min-100g / 10min under the test condition of 230℃ / 2.16kg; The polypropylene resin II has a melt index of 500g / 10min-2000g / 10min under the test condition of 230℃ / 2.16kg; The polypropylene resin II is prepared by a method including the following steps: adding 0.05%-1% of di-tert-butyl peroxyisopropylbenzene by mass percentage in homopolymer polypropylene, and melt-extruding at 150-170℃ to obtain the polypropylene resin II; the homopolymer polypropylene has a melt index of 20g / 10min-30g / 10min under the test condition of 230℃ / 2.16kg; The toughening agent is ethylene-octene copolymer, and the toughening agent has a melt index of 10g / 10min-40g / 10min under the test condition of 190℃ / 2.16kg.

2. The polypropylene composite of claim 1, wherein, The polypropylene resin I is selected from at least one of homopolymer polypropylene and ethylene-propylene block copolymer polypropylene.

3. The polypropylene composite of claim 1, wherein, The inorganic filler is selected from at least one of talc, calcium carbonate, wollastonite, and mica powder.

4. The polypropylene composite of claim 1, wherein, The color masterbatch has a carbon black content of 20wt%-60wt%.

5. The polypropylene composite of claim 1, wherein, The foaming agent is selected from at least one of azodicarbonamide, benzenesulfonylurea, and benzene disulfonohydrazide.

6. The polypropylene composite of claim 1, wherein, The lubricant is selected from at least one of stearate and silicone masterbatch.

7. Process for the production of a polypropylene composite material according to any one of claims 1 to 6, characterized in that, The following steps are included: The polypropylene resin I, the polypropylene resin II, the toughening agent, and the inorganic filler are mixed first, and then the foaming agent, the antioxidant, the lubricant, and the color masterbatch are added and mixed to obtain a premix; the premix is melt-mixed by a double-screw extruder, extruded and granulated to obtain the polypropylene composite material.

8. Use of the polypropylene composite material according to any one of claims 1-6 in the preparation of automobile interior parts.

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