Color-adjustable flame-retardant and antistatic polypropylene composition and its preparation method

Abstract

This invention provides a color-tunable flame-retardant and antistatic polypropylene composition, its preparation method, and articles prepared therefrom. The composition comprises the following components: (1) 56–64 parts by weight of high melt flow index polypropylene; (2) 14–16 parts by weight of ultra-high melt flow index polypropylene; (3) 0.2–1.0 parts by weight of carbon nanotubes; (4) 8–20 parts by weight of a flame retardant; (5) 0.5–1 part by weight of a surface modifier; (6) 0.5–1.5 parts by weight of a compatibilizer; (7) optional pigments; and (8) optional other additives. The color-tunable flame-retardant and antistatic polypropylene composition according to this invention has excellent processing, flame-retardant, and antistatic properties. The product color can be adjusted to be multicolored and easily identifiable, and it can be applied to various fields of production and daily life.

Description

Technical Field

[0001] This invention belongs to the field of flame-retardant and antistatic materials, specifically relating to a high-flow, color-adjustable flame-retardant and antistatic polypropylene composition and its preparation method. Background Technology

[0002] Polypropylene is a widely used polymer material with advantages such as low cost, light weight, chemical resistance, and corrosion resistance. It is commonly produced into pipes, sheets, and films, and is widely used in agriculture, construction, electronics, and packaging. However, polypropylene has a limiting oxygen index of only 18, classifying it as a flammable material. Furthermore, its high insulation properties result in a surface resistivity as high as 10⁻⁶. 16 The presence of Ω leads to the accumulation of static electricity on the surface, which may hinder production, damage electronic equipment, or cause accidents such as explosions due to electrical sparks. This greatly limits the application of polypropylene in many fields such as coal mines, electronics, chemical production, and product transportation.

[0003] Improving the flame-retardant and antistatic properties of polypropylene through blending with flame retardants and antistatic agents has become a research hotspot. Studies have shown that to ensure the flame-retardant and antistatic properties of the formulation system, large amounts of flame retardants and antistatic agents are often required. Commonly used antistatic agents include hydrophilic polymers, metal fibers, carbon fibers, carbon black, and graphene, etc., and these antistatic agents generally require high addition amounts to produce excellent electrical conductivity. For example, Chinese patent application CN201911274784.6 discloses a permanent colored antistatic flame-retardant polyolefin steel wire composite pipe, its preparation method, and mold; Chinese patent application CN201410638892.8 discloses an antistatic and antibacterial color masterbatch and its preparation method; and Chinese patent application CN201010100077.8 discloses an antistatic polyethylene and its preparation method. While using hydrophilic polymers such as permanent high-molecular antistatic agents like polyoxyethylene-polyamide composites, octadecylamine polyoxyethylene ether, dodecylamine polyoxyethylene ether, and ethylene-acrylic acid copolymers can meet the requirements of less demanding antistatic applications, the required dosage remains high. Due to their poor compatibility with polypropylene, the mechanical properties of the product are significantly reduced, especially elongation at break and impact strength, affecting the product's performance and safety. For example, Chinese patent application CN201110405869.0 discloses a V-0 flame-retardant antistatic polypropylene material and its preparation method; Chinese patent application CN201410325494.0 discloses a method for preparing conductive polypropylene; and Chinese patent application CN201710286138.6 discloses a high-strength, high-rigidity graphene-modified polypropylene and its preparation method. These methods improve the flame-retardant and antistatic effects of polypropylene materials by adding flame retardants and antistatic fillers. To form a conductive percolation network and meet the antistatic requirements of various applications, large amounts of antistatic agents such as carbon black and graphene are often added. The addition of conductive fillers forms a physical cross-linked network, which significantly increases the resin viscosity, affecting its processing flowability and making it difficult to fully meet the design and usage requirements of complex, large, and thin-walled parts. Furthermore, the excessive addition of black conductive media such as carbon black and graphene results in products that can only have a black appearance.

[0004] Since their invention, carbon nanotubes have attracted much attention due to their unique small size effect and surface area effect. They have been applied in various fields such as quantum wires, composite materials, hydrogen storage materials, and lithium-ion batteries. Utilizing the extremely high aspect ratio of carbon nanotubes, a 3D conductive network was fabricated, running throughout a polymer substrate. However, carbon nanotubes exhibit poor dispersibility in PP substrates and are prone to aggregation.

[0005] No color-adjustable flame-retardant and antistatic polypropylene compositions have been reported in the prior art. Summary of the Invention

[0006] To address the aforementioned problems in the prior art, the present invention provides a high-flow, color-adjustable, flame-retardant, and antistatic polypropylene composition, a preparation method thereof, and articles comprising the composition.

[0007] According to one aspect of the present invention, a color-adjustable flame-retardant and antistatic polypropylene composition is provided, comprising the following components:

[0008] (1) High melt flow index polypropylene: 56 to 64 parts by weight, wherein the high melt flow index polypropylene has a melt flow rate of 50 to 500 g / 10 min, preferably 80 to 150 g / 10 min, as measured by ISO 1133 under the conditions of temperature 230°C and load 2.16 kg.

[0009] (2) Ultra-high melt flow index polypropylene: 14-16 parts by weight, wherein the ultra-high melt flow index polypropylene has a melt flow rate greater than 500 g / 10 min, preferably greater than 1000 g / 10 min, as measured according to ISO 1133 under the conditions of temperature 230℃ and load 2.16 kg.

[0010] (3) Carbon nanotubes: 0.2 to 1.0 parts by weight, preferably 0.3 to 0.5 parts by weight;

[0011] (4) Flame retardant: 8-20 parts by weight;

[0012] (5) Surface modifier: 0.5 to 1 part by weight;

[0013] (6) Compatibilizer: 0.5 to 1.5 parts by weight;

[0014] (7) Optional pigments: 4 to 10 parts by weight, preferably 4.5 to 6 parts by weight; and

[0015] (8) Optional other additives: 0.3 to 2 parts by weight.

[0016] Preferably, the carbon nanotubes are single-walled carbon nanotubes.

[0017] Preferably, the carbon nanotubes have an average diameter of 1.0–3.0 nm, a length of 5–50 μm, and a specific surface area of ​​500–2000 m². 2 / g, G / D ratio is 10-50.

[0018] Preferably, the high melt flow index polypropylene is selected from one or more of homopolymer polypropylene and copolymer polypropylene, and its number average molecular weight Mn is 10,000 to 50,000, preferably 10,000 to 30,000; and its molecular weight distribution PD is 1.5 to 4, preferably 2 to 3.

[0019] Preferably, the ultra-high melt index polypropylene is selected from one or more of homopolymer polypropylene and copolymer polypropylene, and its number average molecular weight Mn is 30,000 to 100,000, preferably 40,000 to 60,000; and its molecular weight distribution PD is 2 to 4, preferably 2 to 3.5.

[0020] Preferably, the weight ratio of the high melt flow index polypropylene to the ultra-high melt flow index polypropylene is 3 to 7:1, more preferably 4:1.

[0021] Preferably, the pigment can be a pigment commonly used in the art; for example, it can be one or more selected from titanium dioxide, phthalocyanine blue, phthalocyanine green, Brilliant Yellow, and Glamour Red. These pigments can be commercially available products, such as those manufactured and sold by BASF or Bayer.

[0022] Preferably, the flame retardant comprises: 6 to 16 parts by weight, more preferably 8 to 14 parts by weight of a primary flame retardant; and 3 to 6 parts by weight, more preferably 3 to 5 parts by weight of a flame retardant synergist, wherein the primary flame retardant is a halogenated flame retardant, for example, selected from one or more of aromatic brominated compounds, cycloaliphatic brominated compounds, and aliphatic brominated compounds; more preferably decabromodiphenyl ethane or decabromodiphenyl ether; the flame retardant synergist is selected from one or more of antimony trioxide, zinc borate, and nitrogen-based flame retardants (such as melamine and / or melamine cyanuric acid), preferably antimony trioxide.

[0023] Preferably, the surface modifier is one or more selected from titanate coupling agents or silane coupling agents, more preferably a silane coupling agent.

[0024] Preferably, the compatibilizer is selected from polar monomer-grafted polymers; more preferably, the polar monomer is selected from one or more of acid anhydrides, carboxylic acids, carboxylic acid derivatives, amino compounds, hydroxyl compounds, epoxy compounds, and ionic compounds; preferably, the compatibilizer is maleic anhydride-grafted polypropylene (PP-g-MAH) or glycidyl methacrylate-grafted polypropylene (PP-g-GMA), most preferably maleic anhydride-grafted polypropylene; preferably, the melt flow rate of the maleic anhydride-grafted polypropylene, measured according to ISO 1133, is 50–400 g / 10 min under conditions of 230°C and 2.16 kg load, more preferably 100–200 g / 10 min. Further preferably, the grafting rate of maleic anhydride in the maleic anhydride-grafted polypropylene is 1–2%, preferably 1.2–1.5%.

[0025] Preferably, the other additives are selected from one or more of antioxidants, lubricants, anti-photoaging agents, heat stabilizers, superdispersants and nucleating agents.

[0026] Preferably, the color-adjustable flame-retardant and antistatic polypropylene composition according to the present invention has a melt flow rate of 80-150 g / 10 min as measured according to ISO 1133 under conditions of 230°C and 2.16 kg load.

[0027] Preferably, the surface resistivity of the color-adjustable flame-retardant and antistatic polypropylene composition according to the present invention, measured according to the Chinese Coal Mine Industry Standard MT 113-1995, is less than 3 × 10⁻⁶. 8 Ω.

[0028] Preferably, the flame-retardant and antistatic polypropylene composition with adjustable color according to the present invention, measured according to the Chinese Coal Mine Industry Standard MT 113-1995, has the following flame-retardant performance: after removing the alcohol torch, the arithmetic mean of the flame burning of the specimen shall not exceed 3 seconds, the arithmetic mean of the flameless burning of the specimen shall not exceed 10 seconds, and the flame propagation length shall not exceed 280 mm.

[0029] According to a second aspect of the present invention, a method for preparing the color-tunable flame-retardant and antistatic polypropylene composition of the present invention is provided, comprising the following steps:

[0030] (1) The ultra-high melt index polypropylene, carbon nanotubes, surfactants, solubilizers, and optional pigments and other optional additives are sequentially added to a mixer and thoroughly mixed to obtain a granulated additive package.

[0031] Preferably, the mixing temperature of the mixer is 40-80℃, the mixing time is 3-5 minutes, and finally the granulated additive package is obtained by granulation through an extruder. The extrusion temperature is 180-220℃ and the extruder speed is 300 rpm.

[0032] (2) Add the flame retardant to a mixer and mix thoroughly; preferably, the speed of the mixer is 100 rpm and the mixing time is 3 to 5 minutes;

[0033] (3) The high melt index polypropylene is fed to the main feed loss weighing scale. The granulated additive package obtained in step (1) and the flame retardant obtained in step (2) are respectively fed to the side feed loss weighing scale through the vacuum feeding device. The materials are added by the main feed and forced side feed of the extruder to prepare a color-adjustable flame retardant and antistatic polypropylene composition.

[0034] Preferably, a multi-stage process ensures the aspect ratio of the carbon nanotubes and the uniform dispersion of the formulation. The extrusion temperature is 190-230℃, the extruder speed is 200rpm, and after cooling, the carbon nanotubes are cut into 2-5mm particles by a pelletizer to prepare a color-adjustable flame-retardant and antistatic polypropylene composition.

[0035] According to a third aspect of the invention, an article made of the color-adjustable flame-retardant and antistatic polypropylene composition is provided.

[0036] Preferably, the product is a large-sized plate or profile for mining.

[0037] This invention selects carbon nanotubes with high surface area and high G / D ratio, and uses functionalized surface treatment and granular pre-dispersion processes. Through melt flow regulation and multi-stage dispersion, the carbon nanotubes form a conductive percolation network at a low addition amount, thereby mitigating the adverse effects of black conductive filler on color. By adjusting the pigment and its dosage, a color-tunable polypropylene composition with good flame retardancy and antistatic properties can be prepared, thus providing a high-flow, color-tunable flame-retardant and antistatic polypropylene composition and its preparation method. The color-tunable flame-retardant and antistatic polypropylene composition according to this invention has excellent processing, flame retardant, and antistatic properties. The product has bright colors, is easily identifiable, and can be applied in various fields of production and daily life. Detailed Implementation

[0038] The present invention will be described in detail with reference to the following embodiments; however, these embodiments are only used to describe the present invention and the present invention is not limited to these embodiments.

[0039] The methods used to measure performance in the embodiments are shown below.

[0040] The present invention will be described in detail below through embodiments.

[0041] In the following examples and comparative examples,

[0042] Melt flow rate was tested according to standard ISO 1133 (230℃, 2.16kg);

[0043] Flame retardant performance was tested according to Chinese Coal Mine Industry Standard MT 113-1995;

[0044] The antistatic properties were tested according to the Chinese Coal Mine Industry Standard MT 113-1995;

[0045] Color was determined by visual inspection.

[0046] All raw materials used in the implementation example are as follows:

[0047] Polypropylene: SK's 3920 (MI = 100g / 10min, 2.16kg, 230℃);

[0048] Polypropylene: LyondellBasell MF650Y (MI = 1000g / 10min, 2.16kg, 230℃);

[0049] Carbon nanotube 1: Diameter 1.6 nm, length 10 μm, specific surface area 1000 m² 2 / g, G / D = 40;

[0050] Carbon nanotube 2: 10 nm in diameter, 50 μm in length, and 300 m² in specific surface area. 2 / g, G / D=5;

[0051] Titanium dioxide: DuPont's R105;

[0052] Phthalocyanine Blue: BASF's Heliogen K7090;

[0053] Phthalocyanine green: BASF's Heliogen K8730;

[0054] Cromophy: BASF's Cromophytal 2030;

[0055] Yan Jiali Huang: BASF's Irgalite WGP;

[0056] Czech conductive carbon black: CHEZACARB AC80;

[0057] Decabromodiphenyl ethane: Albemarle's 8010;

[0058] Antimony trioxide: China Flashstar Antimony Industry Co., Ltd., effective content >99.8%;

[0059] PP-g-MAH was prepared in-house, and the preparation process is as follows: 100 parts by weight of PP, 0.5 parts by weight of 2,5-dimethyl-2,5-bis(tert-butylperoxide)hexane and 2.5 parts by weight of maleic anhydride were mixed evenly in a high-speed mixer, and then extruded and granulated by a twin-screw extruder (extrusion temperature 150-200℃, main machine speed 200r / min) to obtain PP-g-MAH with a grafting rate of 1.5%;

[0060] Octyltriethoxysilane: SICO-N823 from Shandong Silicon Science New Materials Co., Ltd.;

[0061] Super dispersant, Solplus from Lubrizol Ltd. TM DP320;

[0062] Antioxidant: BASF's B 225.

[0063] In the following embodiments, unless otherwise specified, "parts" means "parts by weight".

[0064] Example 1

[0065] (1) 15.38 parts of polypropylene MF650Y (MI = 1000 g / 10 min, 2.16 kg, 230 ℃) and 0.3 parts of carbon nanotubes (diameter 1.6 nm, length 10 μm, specific surface area 1000 m²) were added. 2 / g, G / D = 40), 2.5 parts titanium dioxide (R105), 0.2 parts Cromophy Red (BASF Cromophytal 2030), 1.8 parts Irgalite Yellow (BASF Irgalite WGP), 1 part MAH-g-PP (grafting rate 1.5%), 0.5 parts silane coupling agent (octyltriethoxysilane, SICO-N823), 0.5 parts superdispersant (Solplus) TM DP320 and 0.3 parts antioxidant (BASF B225) are added sequentially to a high-speed mixer and thoroughly mixed to obtain a polypropylene mixed resin. The mixing temperature of the high-speed mixer is 40-80℃ and the mixing time is 3-5 minutes. Finally, a high-concentration granulated additive package is obtained by granulation through an extruder. The extrusion temperature is 180-220℃ and the extruder speed is 300 rpm.

[0066] (2) Add 16 parts of flame retardant composition (12 parts of decabromodiphenyl ethane (brand name 8010, Albemarle, USA) and 4 parts of antimony trioxide (effective content >99.8%, China Shining Antimony Industry Co., Ltd.) to a high-speed mixer and mix thoroughly. The speed of the high-speed mixer is 100 rpm and the mixing time is 3 to 5 minutes.

[0067] (3) 61.52 parts of polypropylene 3920 (MI = 100g / 10min, 2.16kg, 230℃) were fed to the main feed loss scale. The high-concentration granulated additive package obtained in step (1) and the flame retardant composition in step (2) were respectively transported to the side feed loss scale through a vacuum feeding device. The materials were added by the main feed and forced side feed of the extruder. The multi-stage process ensured the length-to-diameter ratio of the carbon tube and the uniform dispersion of the formulation. The extrusion temperature was 190~230℃ and the extruder speed was 200rpm. After cooling, the particles were cut into 2~5mm particles by a pelletizer to prepare a high-flow colored flame retardant and antistatic polypropylene composition.

[0068] The performance test results of the high-flow colored flame-retardant and antistatic polypropylene composition are as follows: color is yellow, melt flow rate is 144.7 g / 10 min, and surface resistivity is 3*10. 5 Ω, Flame retardant performance: Qualified.

[0069] Example 2

[0070] (1) 15.26 parts of polypropylene MF650Y (MI = 1000 g / 10 min, 2.16 kg, 230 ℃) and 0.4 parts of carbon nanotubes (diameter 1.6 nm, length 10 μm, specific surface area 1000 m²) were added. 2 / g, G / D = 40), 3 parts titanium dioxide (R105), 2 parts phthalocyanine green (BASF's Heliogen K8730), 1 part MAH-g-PP (grafting rate 1.5%), 0.5 parts silane coupling agent (octyltriethoxysilane, SICO-N823), 0.5 parts superdispersant (Solplus) TM DP320 and 0.3 parts antioxidant (BASF B225) are added sequentially to a high-speed mixer and thoroughly mixed to obtain a polypropylene mixed resin. The mixing temperature of the high-speed mixer is 40-80℃ and the mixing time is 3-5 minutes. Finally, a high-concentration granulated additive package is obtained by granulation through an extruder. The extrusion temperature is 180-220℃ and the extruder speed is 300 rpm.

[0071] (2) Add 16 parts of flame retardant composition (12 parts of decabromodiphenyl ethane (brand name 8010, Albemarle, USA) and 4 parts of antimony trioxide (effective content >99.8%, China Shining Antimony Industry Co., Ltd.) to a high-speed mixer and mix thoroughly. The speed of the high-speed mixer is 100 rpm and the mixing time is 3 to 5 minutes.

[0072] (3) 61.04 parts of polypropylene 3920 (MI = 100g / 10min, 2.16kg, 230℃) were fed to the main feed loss scale. The high-concentration granulated additive package obtained in step (1) and the flame retardant composition in step (2) were respectively transported to the side feed loss scale through a vacuum feeding device. The materials were added by the main feed and forced side feed of the extruder. The multi-stage process ensured the length-to-diameter ratio of the carbon tube and the uniform dispersion of the formulation. The extrusion temperature was 190~230℃ and the extruder speed was 200rpm. After cooling, the particles were cut into 2~5mm particles by a pelletizer to prepare a high-flow colored flame retardant and antistatic polypropylene composition.

[0073] The performance test results of this high-flow colored flame-retardant and antistatic polypropylene composition are as follows: color is green, melt flow rate is 142.1 g / 10 min, and surface resistivity is 1*10. 5 Ω, Flame retardant performance: Qualified.

[0074] Example 3

[0075] (1) 15.04 parts of polypropylene MF650Y (MI = 1000 g / 10 min, 2.16 kg, 230 ℃) and 0.5 parts of carbon nanotubes (diameter 1.6 nm, length 10 μm, specific surface area 1000 m²) were added. 2 / g, G / D = 40), 4 parts titanium dioxide (R105), 1.5 parts Cromophytal 2030 (BASF), 0.5 parts Irgalite WGP (BASF), 1 part MAH-g-PP (grafting rate 1.5%), 0.5 parts silane coupling agent (octyltriethoxysilane, SICO-N823), 0.5 parts superdispersant (Solplus) TM DP320 and 0.3 parts antioxidant (BASF B225) are added sequentially to a high-speed mixer and thoroughly mixed to obtain a polypropylene mixed resin. The mixing temperature of the high-speed mixer is 40-80℃ and the mixing time is 3-5 minutes. Finally, a high-concentration granulated additive package is obtained by granulation through an extruder. The extrusion temperature is 180-220℃ and the extruder speed is 300 rpm.

[0076] (2) Add 16 parts of flame retardant composition (12 parts of decabromodiphenyl ethane (brand name 8010, Albemarle, USA) and 4 parts of antimony trioxide (effective content >99.8%, China Shining Antimony Industry Co., Ltd.) to a high-speed mixer and mix thoroughly. The speed of the high-speed mixer is 100 rpm and the mixing time is 3 to 5 minutes.

[0077] (3) 60.16 parts of polypropylene 3920 (MI = 100g / 10min, 2.16kg, 230℃) were fed to the main feed loss scale. The high-concentration granulated additive package obtained in step (1) and the flame retardant composition in step (2) were respectively transported to the side feed loss scale through a vacuum feeding device. The materials were added by the main feed and forced side feed of the extruder. The multi-stage process ensured the length-to-diameter ratio of the carbon tube and the uniform dispersion of the formula. The extrusion temperature was 190-230℃ and the extruder speed was 200rpm. After cooling, the material was cut into 2-5mm particles by a pelletizer to prepare a high-flow colored flame retardant and antistatic polypropylene composition.

[0078] The performance test results of this high-flow colored flame-retardant and antistatic polypropylene composition are as follows: color is red, melt flow rate is 139.4 g / 10 min, and surface resistivity is 1*10. 4 Ω, Flame retardant performance: Qualified.

[0079] Example 4

[0080] (1) 15.04 parts of polypropylene MF650Y (MI = 1000 g / 10 min, 2.16 kg, 230 ℃) and 0.5 parts of carbon nanotubes (diameter 1.6 nm, length 10 μm, specific surface area 1000 m²) were added. 2 / g, G / D = 40), 4 parts titanium dioxide (R105), 2 parts phthalocyanine blue (Heliogen K7090), 1 part MAH-g-PP (grafting rate 1.5%), 0.5 parts silane coupling agent (octyltriethoxysilane, SICO-N823), 0.5 parts superdispersant (Solplus) TM DP320 and 0.3 parts antioxidant (BASF B225) are added sequentially to a high-speed mixer and thoroughly mixed to obtain a polypropylene mixed resin. The mixing temperature of the high-speed mixer is 40-80℃ and the mixing time is 3-5 minutes. Finally, a high-concentration granulated additive package is obtained by granulation through an extruder. The extrusion temperature is 180-220℃ and the extruder speed is 300 rpm.

[0081] (2) Add 16 parts of flame retardant composition (12 parts of decabromodiphenyl ethane (brand name 8010, Albemarle, USA) and 4 parts of antimony trioxide (effective content >99.8%, China Shining Antimony Industry Co., Ltd.) to a high-speed mixer and mix thoroughly. The speed of the high-speed mixer is 100 rpm and the mixing time is 3 to 5 minutes.

[0082] (3) 60.16 parts of polypropylene 3920 (MI = 100g / 10min, 2.16kg, 230℃) were fed to the main feed loss scale. The high-concentration granulated additive package obtained in step (1) and the flame retardant composition in step (2) were respectively transported to the side feed loss scale through a vacuum feeding device. The materials were added by the main feed and forced side feed of the extruder. The multi-stage process ensured the length-to-diameter ratio of the carbon tube and the uniform dispersion of the formula. The extrusion temperature was 190-230℃ and the extruder speed was 200rpm. After cooling, the material was cut into 2-5mm particles by a pelletizer to prepare a high-flow colored flame retardant and antistatic polypropylene composition.

[0083] The performance test results of this high-flow colored flame-retardant and antistatic polypropylene composition are as follows: color is blue, melt flow rate is 138.9 g / 10 min, and surface resistivity is 1*10. 4 Ω, Flame retardant performance: Qualified.

[0084] Comparative Example 1

[0085] (1) 15.41 parts of polypropylene MF650Y (MI = 1000 g / 10 min, 2.16 kg, 230 ℃) and 0.15 parts of carbon nanotubes (diameter 1.6 nm, length 10 μm, specific surface area 1000 m²) were added. 2 / g, G / D = 40), 2.5 parts titanium dioxide (R105), 0.2 parts Cromophy Red (BASF Cromophytal 2030), 1.8 parts Irgalite Yellow (BASF Irgalite WGP), 1 part MAH-g-PP (grafting rate 1.5%), 0.5 parts silane coupling agent (octyltriethoxysilane, SICO-N823), 0.5 parts superdispersant (Solplus) TM DP320 and 0.3 parts antioxidant (BASF B225) are added sequentially to a high-speed mixer and thoroughly mixed to obtain a polypropylene mixed resin. The mixing temperature of the high-speed mixer is 40-80℃ and the mixing time is 3-5 minutes. Finally, a high-concentration granulated additive package is obtained by granulation through an extruder. The extrusion temperature is 180-220℃ and the extruder speed is 300 rpm.

[0086] (2) Add 16 parts of flame retardant composition (12 parts of decabromodiphenyl ethane (brand name 8010, Albemarle, USA) and 4 parts of antimony trioxide (effective content >99.8%, China Shining Antimony Industry Co., Ltd.) to a high-speed mixer and mix thoroughly. The speed of the high-speed mixer is 100 rpm and the mixing time is 3 to 5 minutes.

[0087] (3) 61.64 parts of polypropylene 3920 (MI = 100g / 10min, 2.16kg, 230℃) were fed to the main feed loss scale. The high-concentration granulated additive package obtained in step (1) and the flame retardant composition in step (2) were respectively transported to the side feed loss scale through a vacuum feeding device. The materials were added by the main feed and forced side feed of the extruder. The multi-stage process ensured the length-to-diameter ratio of the carbon tube and the uniform dispersion of the formula. The extrusion temperature was 190-230℃ and the extruder speed was 200rpm. After cooling, the material was cut into 2-5mm particles by a pelletizer to prepare a high-flow colored flame retardant and antistatic polypropylene composition.

[0088] The performance test results of this high-flow colored flame-retardant and antistatic polypropylene composition are as follows: color is yellow, melt flow rate is 146.5 g / 10 min, and surface resistivity is ≥1*10. 12 Ω, Flame retardant performance: Qualified.

[0089] Comparative Example 2

[0090] (1) 15.04 parts of polypropylene MF650Y (MI = 1000 g / 10 min, 2.16 kg, 230 ℃) and 0.5 parts of carbon nanotubes (diameter 10 nm, length 50 μm, specific surface area 300 m²) were added. 2 / g, G / D=5), 4 parts titanium dioxide (R105), 2 parts phthalocyanine blue (Heliogen K7090), 1 part MAH-g-PP (grafting rate 1.5%), 0.5 parts silane coupling agent (octyltriethoxysilane, SICO-N823), 0.5 parts superdispersant (Solplus) TM DP320 and 0.3 parts antioxidant (BASF B225) are added sequentially to a high-speed mixer and thoroughly mixed to obtain a polypropylene mixed resin. The mixing temperature of the high-speed mixer is 40-80℃ and the mixing time is 3-5 minutes. Finally, a high-concentration granulated additive package is obtained by granulation through an extruder. The extrusion temperature is 180-220℃ and the extruder speed is 300 rpm.

[0091] (2) Add 16 parts of flame retardant composition (12 parts of decabromodiphenyl ethane (brand name 8010, Albemarle, USA) and 4 parts of antimony trioxide (effective content >99.8%, China Shining Antimony Industry Co., Ltd.) to a high-speed mixer and mix thoroughly. The speed of the high-speed mixer is 100 rpm and the mixing time is 3 to 5 minutes.

[0092] (3) 60.16 parts of polypropylene 3920 (MI = 100g / 10min, 2.16kg, 230℃) were fed to the main feed loss scale. The high-concentration granulated additive package obtained in step (1) and the flame retardant composition in step (2) were respectively transported to the side feed loss scale through a vacuum feeding device. The materials were added by the main feed and forced side feed of the extruder. The multi-stage process ensured the length-to-diameter ratio of the carbon tube and the uniform dispersion of the formula. The extrusion temperature was 190-230℃ and the extruder speed was 200rpm. After cooling, the material was cut into 2-5mm particles by a pelletizer to prepare a high-flow colored flame retardant and antistatic polypropylene composition.

[0093] The performance test results of this high-flow colored flame-retardant and antistatic polypropylene composition are as follows: color is blue, melt flow rate is 130.83 g / 10 min, and surface resistivity is ≥1*10. 12 Ω, Flame retardant performance: Qualified.

[0094] Comparative Example 3

[0095] (1) 14.74 parts of polypropylene MF650Y (MI = 1000 g / 10 min, 2.16 kg, 230 ℃) and 2.0 parts of carbon nanotubes (diameter 10 nm, length 50 μm, specific surface area 300 m²) were added. 2 / g, G / D=5), 4 parts titanium dioxide (R105), 2 parts phthalocyanine blue (Heliogen K7090), 1 part MAH-g-PP (grafting rate 1.5%), 0.5 parts silane coupling agent (octyltriethoxysilane, SICO-N823), 0.5 parts superdispersant (Solplus) TM DP320 and 0.3 parts antioxidant (BASF B225) are added sequentially to a high-speed mixer and thoroughly mixed to obtain a polypropylene mixed resin. The mixing temperature of the high-speed mixer is 40-80℃ and the mixing time is 3-5 minutes. Finally, a high-concentration granulated additive package is obtained by granulation through an extruder. The extrusion temperature is 180-220℃ and the extruder speed is 300 rpm.

[0096] (2) Add 16 parts of flame retardant composition (12 parts of decabromodiphenyl ethane (brand name 8010, Albemarle, USA) and 4 parts of antimony trioxide (effective content >99.8%, China Shining Antimony Industry Co., Ltd.) to a high-speed mixer and mix thoroughly. The speed of the high-speed mixer is 100 rpm and the mixing time is 3 to 5 minutes.

[0097] (3) 58.96 parts of polypropylene 3920 (MI = 100g / 10min, 2.16kg, 230℃) were fed to the main feed loss scale. The high-concentration granulated additive package obtained in step (1) and the flame retardant composition in step (2) were respectively transported to the side feed loss scale through a vacuum feeding device. The materials were added by the main feed and forced side feed of the extruder. The multi-stage process ensured the length-to-diameter ratio of the carbon tube and the uniform dispersion of the formula. The extrusion temperature was 190~230℃ and the extruder speed was 200rpm. After cooling, the particles were cut into 2~5mm particles by a pelletizer to prepare a high-flow colored flame retardant and antistatic polypropylene composition.

[0098] The performance test results of this high-flow colored flame-retardant and antistatic polypropylene composition are as follows: color is black, melt flow rate is 92.97 g / 10 min, and surface resistivity is 1*10. 8 Ω, Flame retardant performance: Qualified.

[0099] Comparative Example 4

[0100] (1) Mix 14.94 parts of polypropylene MF650Y (MI = 1000 g / 10 min, 2.16 kg, 230 °C), 1.0 part of Czech superconducting carbon black (CHEZACARB AC80), 4 parts of titanium dioxide (R105), 1.5 parts of Cromophytal 2030 (BASF), 0.5 parts of Irgalite WGP (BASF), 1 part of MAH-g-PP (grafting rate 1.5%), 0.5 parts of silane coupling agent (octyltriethoxysilane, SICO-N823), and 0.5 parts of superdispersant (Solplus). TM DP320 and 0.3 parts antioxidant (BASF B225) are added sequentially to a high-speed mixer and thoroughly mixed to obtain a polypropylene mixed resin. The mixing temperature of the high-speed mixer is 40-80℃ and the mixing time is 3-5 minutes. Finally, a high-concentration granulated additive package is obtained by granulation through an extruder. The extrusion temperature is 180-220℃ and the extruder speed is 300 rpm.

[0101] (2) Add 16 parts of flame retardant composition (12 parts of decabromodiphenyl ethane (brand name 8010, Albemarle, USA) and 4 parts of antimony trioxide (effective content >99.8%, China Shining Antimony Industry Co., Ltd.) to a high-speed mixer and mix thoroughly. The speed of the high-speed mixer is 100 rpm and the mixing time is 3 to 5 minutes.

[0102] (3) 59.76 parts of polypropylene 3920 (MI = 100g / 10min, 2.16kg, 230℃) were fed to the main feed loss scale. The high-concentration granulated additive package obtained in step (1) and the flame retardant composition in step (2) were respectively transported to the side feed loss scale through a vacuum feeding device. The materials were added by the main feed and forced side feed of the extruder. The multi-stage process ensured the length-to-diameter ratio of the carbon tube and the uniform dispersion of the formula. The extrusion temperature was 190~230℃ and the extruder speed was 200rpm. After cooling, the material was cut into 2~5mm particles by a pelletizer to prepare a high-flow colored flame retardant and antistatic polypropylene composition.

[0103] The performance test results of this high-flow colored flame-retardant and antistatic polypropylene composition are as follows: color is red, melt flow rate is 114.78 g / 10 min, and surface resistivity is ≥1*10. 12 Ω, Flame retardant performance: Qualified.

[0104] Comparative Example 5

[0105] (1) Mix 14.74 parts of polypropylene MF650Y (MI = 1000 g / 10 min, 2.16 kg, 230 °C), 2.0 parts of Czech superconducting carbon black (CHEZACARB AC80), 4 parts of titanium dioxide (R105), 1.5 parts of Cromophytal 2030 (BASF), 0.5 parts of Irgalite WGP (BASF), 1 part of MAH-g-PP (grafting rate 1.5%), 0.5 parts of silane coupling agent (octyltriethoxysilane, SICO-N823), and 0.5 parts of superdispersant (Solplus). TM DP320 and 0.3 parts antioxidant (BASF B225) are added sequentially to a high-speed mixer and thoroughly mixed to obtain a polypropylene mixed resin. The mixing temperature of the high-speed mixer is 40-80℃ and the mixing time is 3-5 minutes. Finally, a high-concentration granulated additive package is obtained by granulation through an extruder. The extrusion temperature is 180-220℃ and the extruder speed is 300 rpm.

[0106] (2) Add 16 parts of flame retardant composition (12 parts of decabromodiphenyl ethane (brand name 8010, Albemarle, USA) and 4 parts of antimony trioxide (effective content >99.8%, China Shining Antimony Industry Co., Ltd.) to a high-speed mixer and mix thoroughly. The speed of the high-speed mixer is 100 rpm and the mixing time is 3 to 5 minutes.

[0107] (3) 58.96 parts of polypropylene 3920 (MI = 100g / 10min, 2.16kg, 230℃) were fed to the main feed loss scale. The high-concentration granulated additive package obtained in step (1) and the flame retardant composition in step (2) were respectively transported to the side feed loss scale through a vacuum feeding device. The materials were added by the main feed and forced side feed of the extruder. The multi-stage process ensured the length-to-diameter ratio of the carbon tube and the uniform dispersion of the formula. The extrusion temperature was 190~230℃ and the extruder speed was 200rpm. After cooling, the particles were cut into 2~5mm particles by a pelletizer to prepare a high-flow colored flame retardant and antistatic polypropylene composition.

[0108] The performance test results of this high-flow colored flame-retardant and antistatic polypropylene composition are as follows: color is black, melt flow rate is 96.69 g / 10 min, and surface resistivity is 3*10. 5 Ω, Flame retardant performance: Qualified.

[0109] Compared to Example 1, Comparative Example 1 showed high surface resistance due to insufficient addition of conductive carbon nanotubes, failing to meet application requirements. Comparative Example 2, compared to Example 4, also showed high surface resistance due to carbon nanotubes not meeting performance specifications, failing to meet application requirements. Comparative Example 3, compared to Example 4, met antistatic performance requirements, but the excessive amount of unsatisfactory carbon nanotubes meant the product could only be black. Comparative Examples 4 and 5, compared to Example 3, showed gradually decreasing surface resistance after adding different amounts of Czech carbon black until the application requirements were met, but the color remained black.

[0110] Although several embodiments of the invention have been shown and described, the invention is not limited to the described embodiments. Rather, those skilled in the art will recognize that any modifications and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is determined by the appended claims and their equivalents.

Claims

1. A color-adjustable flame-retardant and antistatic polypropylene composition, comprising the following components: (1) High melt flow index polypropylene: 56-64 parts by weight, of which, The high melt flow index polypropylene, measured according to ISO 1133 at a temperature of 230°C and a load of 2.16 kg, has a melt flow rate of 50–500 g / 10 min. (2) Ultra-high melt flow index polypropylene: 14 to 16 parts by weight, wherein the ultra-high melt flow index polypropylene has a melt flow rate greater than 500 g / 10 min as measured by ISO 1133 under the conditions of temperature 230°C and load 2.16 kg. (3) Carbon nanotubes: 0.2–1.0 parts by weight, wherein the carbon nanotubes are single-walled carbon nanotubes; the average diameter of the carbon nanotubes is 1.0–3.0 nm, the length is 5–50 μm, and the specific surface area is 500–2000 m². 2 / g, G / D ratio is 10-50; (4) Flame retardant: 8-20 parts by weight; (5) Surface modifier: 0.5 to 1 part by weight; (6) Compatibilizer: 0.5 to 1.5 parts by weight; (7) Optional pigments: 4–10 parts by weight; and (8) Optional other additives: 0.3 to 2 parts by weight.

2. The color-adjustable flame-retardant and antistatic polypropylene composition according to claim 1, wherein, The high melt flow index polypropylene, measured according to ISO 1133 at a temperature of 230°C and a load of 2.16 kg, has a melt flow rate of 80–150 g / 10 min; and / or The ultra-high melt flow index polypropylene, measured according to ISO 1133 at a temperature of 230°C and a load of 2.16 kg, has a melt flow rate greater than 1000 g / 10 min; and / or The amount of carbon nanotubes used is 0.3 to 0.5 parts; and / or The pigment content is 4.5 to 6 parts by weight.

3. The color-adjustable flame-retardant and antistatic polypropylene composition according to claim 1, wherein, The high melt flow index polypropylene is selected from one or more homopolymer polypropylene and copolymer polypropylene, with a number average molecular weight Mn of 10,000 to 50,000; a molecular weight distribution PD of 1.5 to 4; and / or The ultra-high melt index polypropylene is selected from one or more of homopolymer polypropylene and copolymer polypropylene, with a number average molecular weight Mn of 30,000 to 100,000 and a molecular weight distribution PD of 2 to 4.

4. The color-adjustable flame-retardant and antistatic polypropylene composition according to claim 3, wherein, The high melt index polypropylene has a number average molecular weight Mn of 10,000 to 30,000; and / or The high melt flow index polypropylene has a molecular weight distribution (PD) of 2–3; and / or The ultra-high melt index polypropylene has a number-average molecular weight Mn of 40,000 to 60,000; and / or The ultra-high melt index polypropylene has a molecular weight distribution (PD) of 2.0–3.5; and / or The weight ratio of the high melt flow index polypropylene to the ultra-high melt flow index polypropylene is 3 to 7:

1.

5. The color-adjustable flame-retardant and antistatic polypropylene composition according to any one of claims 1 to 4, wherein, The pigment is selected from one or more of titanium dioxide, phthalocyanine blue, phthalocyanine green, Brilliant Yellow, and Glamour Red; and / or The weight ratio of the high melt flow index polypropylene to the ultra-high melt flow index polypropylene is 4:

1.

6. The color-adjustable flame-retardant and antistatic polypropylene composition according to any one of claims 1 to 3, wherein, The flame retardant comprises: 6 to 16 parts by weight of the main flame retardant; and 3-6 parts by weight of flame retardant synergist, The main flame retardant is a halogenated flame retardant; The flame retardant synergist is selected from one or more of antimony trioxide, zinc borate, and nitrogen-based flame retardants.

7. The color-adjustable flame-retardant and antistatic polypropylene composition according to claim 6, wherein, The content of the main flame retardant is 8 to 14 parts by weight; and / or The content of the flame retardant synergist is 3 to 5 parts by weight; and / or The primary flame retardant is selected from one or more aromatic brominated compounds, cycloaliphatic brominated compounds, and aliphatic brominated compounds.

8. The color-adjustable flame-retardant and antistatic polypropylene composition according to claim 6, wherein, The primary flame retardant is decabromodiphenyl ethane and / or decabromodiphenyl ether; and / or The flame retardant synergist is antimony trioxide.

9. The color-adjustable flame-retardant and antistatic polypropylene composition according to any one of claims 1 to 3, wherein, The surface modifier is one or more selected from titanate coupling agents and silane coupling agents; and / or The compatibilizer is selected from polar monomer grafted polymers.

10. The color-adjustable flame-retardant and antistatic polypropylene composition according to claim 9, wherein, The surface modifier is a silane coupling agent; and / or The polar monomer is selected from one or more of acid anhydrides, carboxylic acids, carboxylic acid derivatives, amine compounds, hydroxyl compounds, epoxy compounds, and ionic compounds.

11. The color-adjustable flame-retardant and antistatic polypropylene composition according to claim 9, wherein, The compatibilizer is maleic anhydride-grafted polypropylene or glycidyl methacrylate-grafted polypropylene.

12. The color-adjustable flame-retardant and antistatic polypropylene composition according to claim 11, wherein, The maleic anhydride-grafted polypropylene, under conditions of 230°C and a load of 2.16 kg, exhibits a melt flow rate of 50–400 g / 10 min as measured according to ISO 1133; and / or The maleic anhydride grafting rate of the maleic anhydride-grafted polypropylene is 1-2%.

13. The color-adjustable flame-retardant and antistatic polypropylene composition according to claim 11, wherein, The maleic anhydride-grafted polypropylene, under conditions of 230°C and a load of 2.16 kg, exhibits a melt flow rate of 100–200 g / 10 min as measured according to ISO 1133; and / or The maleic anhydride grafting rate of the maleic anhydride-grafted polypropylene is 1.2-1.5%.

14. The color-adjustable flame-retardant and antistatic polypropylene composition according to any one of claims 1 to 3, wherein, The other additives are selected from one or more of antioxidants, lubricants, anti-photoaging agents, heat stabilizers, superdispersants and nucleating agents.

15. The color-adjustable flame-retardant and antistatic polypropylene composition according to any one of claims 1 to 3, wherein, The color-adjustable flame-retardant and antistatic polypropylene composition exhibits a melt flow rate of 80–150 g / 10 min as measured according to ISO 1133 at a temperature of 230°C and a load of 2.16 kg; and / or The color-adjustable flame-retardant and antistatic polypropylene composition according to the present invention has a surface resistivity of less than 3 × 10⁻⁶, as measured according to the Chinese Coal Mine Industry Standard MT113-1995. 8 Ω; and / or According to the Chinese Coal Mine Industry Standard MT113-1995, the flame retardant performance of the color-adjustable flame-retardant and antistatic polypropylene composition of the present invention is as follows: after removing the alcohol torch, the arithmetic mean of the flame burning of the specimen shall not exceed 3 seconds, the arithmetic mean of the flameless burning of the specimen shall not exceed 10 seconds, and the flame propagation length shall not exceed 280 mm.

16. A method for preparing a color-tunable flame-retardant and antistatic polypropylene composition according to any one of claims 1 to 15, comprising the following steps: (1) The ultra-high melt index polypropylene, carbon nanotubes, surfactants, solubilizers, and optional pigments and other optional additives are sequentially added to a mixer and thoroughly mixed to obtain a granulated additive package. (2) Add the flame retardant to the mixer and mix thoroughly; (3) The high melt index polypropylene is fed to the main feed loss weighing scale. The granulated additive package obtained in step (1) and the flame retardant obtained in step (2) are respectively fed to the side feed loss weighing scale through a vacuum feeding device. The materials are added by the main feed and forced side feed of the extruder to prepare a color-adjustable flame retardant and antistatic polypropylene composition.

17. The method for preparing a color-tunable flame-retardant and antistatic polypropylene composition according to claim 16, wherein, In step (1), the mixing temperature of the mixer is 40–80°C, the mixing time is 3–5 minutes, and finally, the granulated additive package is obtained by granulation through an extruder at a temperature of 180–220°C and an extruder speed of 300 rpm; and / or In step (2), the mixer rotates at 100 rpm, and the mixing time is 3-5 minutes; and / or In step (3), the extrusion temperature is 190-230℃, the extruder speed is 200rpm, and after cooling, it is cut into 2-5mm particles by a pelletizer.

18. An article made from the color-adjustable flame-retardant and antistatic polypropylene composition according to any one of claims 1 to 15.

19. The article of claim 18, wherein, The product is a plate or profile used in mining.