Composite antistatic polypropylene plastic and its preparation method

Abstract

The application discloses a kind of composite antistatic polypropylene plastic and preparation method thereof, the polypropylene plastic is prepared by polypropylene resin, modified graphene, polyethylene glycol methacrylic acid copolymer, antioxidant and lubricant according to certain proportion.It is prepared that the preparation method of the polypropylene plastic is: S1, polypropylene resin, modified graphene, polyethylene glycol methacrylic acid copolymer, antioxidant and lubricant are added into mixing machine, and high-speed mixing is uniformly mixed;S2, the mixture is added into twin-screw extruder extrusion granulation, and the composite antistatic polypropylene plastic is obtained.The polypropylene plastic has good antistatic effect and low-temperature toughness, and other performances meet the requirements of line standard or national standard.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polypropylene pipe fittings, in particular to a composite antistatic polypropylene plastic and a preparation method thereof. BACKGROUND

[0002] Polypropylene is one of the five general-purpose plastics, and has a wide range of applications due to its abundant raw material sources, low price, easy processing, and excellent comprehensive performance. It has become a rapidly developing variety among general-purpose resins. Although polypropylene has high mechanical strength, excellent heat resistance, good corrosion resistance and electrical insulation, and outstanding rigidity and bending resistance, it also has some shortcomings.

[0003] Polypropylene has strong electrical insulation, and in modern industrial production and daily life, static electricity often causes significant losses and disasters. Methods for preventing static electricity on the surface of polymers mainly include air ionization, humidification, metal contact discharge, radiation, introduction of conductive substances, formation of a hygroscopic film on the surface, chemical treatment modification, and the use of antistatic agents.

[0004] Graphene has extremely high electrical conductivity and electron mobility, and therefore can be used to manufacture antistatic materials. Graphene is usually added to polypropylene resin to improve the electrical conductivity of the polypropylene resin, which not only prevents static electricity but also has good mechanical properties. When the amount of graphene added to the polypropylene resin is too small, the antistatic effect is poor. If the content of graphene is increased, the antistatic effect of the polypropylene resin can be enhanced to some extent, but the price of graphene is relatively high, and when the content of graphene increases to a certain value, not only the mechanical properties decrease significantly, but also the graphene tends to agglomerate during processing, which cannot be uniformly dispersed, thereby affecting the antistatic effect of the polypropylene resin. SUMMARY

[0005] To solve the problems existing in the prior art, the present application provides a composite antistatic polypropylene plastic and a preparation method thereof. The polypropylene plastic has good antistatic effect and low-temperature toughness, and other properties meet the requirements of national standards or industry standards.

[0006] The technical scheme adopted by the present application to achieve the above-mentioned purposes is as follows:

[0007] A composite antistatic polypropylene plastic is prepared from the following raw materials by mass:

[0008]

[0009]

[0010] Further, the preparation method of the modified graphene is as follows:

[0011] The silane coupling agent is added into a mixed solution of ethanol and water, stirred uniformly, the graphene is added, the mass ratio of the silane coupling agent to the graphene is 0.5-1.5:100, after being uniformly dispersed, the mixture is soaked for 20-24 hours, centrifuged, dried, and the modified graphene is obtained.

[0012] Further, the silane coupling agent is at least one selected from gamma-methacryloxypropyltrimethoxysilane, N-(beta-aminoethyl)-gamma-aminopropyltrimeth(eth)oxysilane and n-octyltriethoxysilane.

[0013] Further, the mass ratio of ethanol to water in the mixed solution is 18-20:1.

[0014] Further, the lubricant is at least one selected from paraffin wax, polyethylene wax and stearic acid.

[0015] Further, the antioxidant is at least one selected from antioxidant 1010, antioxidant 168 and antioxidant 1076.

[0016] A preparation method of a composite antistatic polypropylene plastic, characterized by comprising the following steps:

[0017] S1, polypropylene resin, modified graphene, polyethylene glycol methacrylic acid copolymer, antioxidant and lubricant are added into a mixing machine and uniformly mixed at high speed;

[0018] S3, the mixture is added into a double-screw extruder for extrusion granulation to obtain the composite antistatic polypropylene plastic.

[0019] Further, the temperature of the extrusion granulation is 170-190 DEG C.

[0020] Compared with the prior art, the advantages and beneficial effects of the present application are:

[0021] 1, the modified graphene and the polyethylene glycol methacrylic acid copolymer are used as the composite antistatic agent, the modified graphene and the polyethylene glycol methacrylic acid copolymer form special conductive paths in the polypropylene resin, and the static electricity is discharged through the paths, and the two have a synergistic effect, which significantly improves the antistatic effect of the polypropylene plastic.

[0022] 2, the modified graphene and the polyethylene glycol methacrylic acid copolymer are used as the composite antistatic agent, and the low-temperature toughness of the polypropylene plastic can also be improved. DETAILED DESCRIPTION

[0023] The present application will be described in detail below in combination with specific embodiments, but these embodiments are not interpreted as limiting the scope of protection of the present application in any sense.

[0024] Example 1

[0025] A composite antistatic polypropylene plastic is prepared from the following raw materials by mass parts:

[0026]

[0027]

[0028] The preparation method of the modified graphene

[0029] 1 mass part of γ-methacryloxypropyl trimethoxysilane is added to a mixed solution prepared from 95 mass parts of ethanol and 5 mass parts of water, stirred uniformly, 10 mass parts of graphene is added, ultrasonic dispersion is uniform, then soaked for 22 h, centrifuged, and freeze-dried to obtain the modified graphene.

[0030] The preparation method of the composite antistatic polypropylene plastic is as follows:

[0031] 1. Polypropylene resin, modified graphene, polyethylene glycol methacrylic acid copolymer, antioxidant and lubricant are added to a mixing pot, the rotating speed of the mixing pot is controlled at 1000 r / min, and mixed uniformly;

[0032] 2. The mixed materials are added to a double-screw extruder for extrusion granulation, the temperature for extrusion granulation is 180℃, and the composite antistatic polypropylene plastic is obtained.

[0033] Example 2

[0034] A composite antistatic polypropylene plastic is prepared from the following raw materials by mass parts:

[0035]

[0036] The preparation method of the modified graphene

[0037] 1 mass part of γ-methacryloxypropyl trimethoxysilane is added to a mixed solution prepared from 95 mass parts of ethanol and 5 mass parts of water, stirred uniformly, 10 mass parts of graphene is added, ultrasonic dispersion is uniform, then soaked for 22 h, centrifuged, and freeze-dried to obtain the modified graphene.

[0038] The preparation method of the composite antistatic polypropylene plastic is as follows:

[0039] 1. Polypropylene resin, modified graphene, polyethylene glycol methacrylic acid copolymer, antioxidant and lubricant are added to a mixing pot, the rotating speed of the mixing pot is controlled at 100 r / min, and mixed uniformly;

[0040] 2. The mixed materials are added to a double-screw extruder for extrusion granulation, the temperature for extrusion granulation is 180℃, and the composite antistatic polypropylene plastic is obtained.

[0041] Example 3

[0042] A composite antistatic polypropylene plastic is prepared from the following raw materials in parts by mass:

[0043]

[0044] The preparation method of the modified graphene described above

[0045] 1 part by mass of γ-methacryloxypropyltrimethoxysilane is added to a mixed solution prepared from 95 parts by mass of ethanol and 5 parts by mass of water, stirred until uniform, 10 parts by mass of graphene is added, ultrasonically dispersed until uniform, then soaked for 22 hours, centrifuged, and freeze-dried to obtain the modified graphene.

[0046] The preparation method of the composite antistatic polypropylene plastic described above is as follows:

[0047] 1. Polypropylene resin, modified graphene, polyethylene glycol methacrylic acid copolymer, antioxidant, and lubricant are added to a mixing kettle, the rotation speed of the mixing kettle is controlled at 1000 r / min, and mixed until uniform;

[0048] 2. The mixed materials are added to a twin-screw extruder for extrusion granulation, the temperature for extrusion granulation is 180°C, and the composite antistatic polypropylene plastic is obtained.

[0049] Comparative Example 1

[0050] A polypropylene plastic is prepared from the following raw materials in parts by mass:

[0051]

[0052] The preparation method of the polypropylene plastic described above is as follows:

[0053] 1. Polypropylene resin, polyethylene glycol methacrylic acid copolymer, antioxidant, and lubricant are added to a mixing kettle, the rotation speed of the mixing kettle is controlled at 1000 r / min, and mixed until uniform;

[0054] 2. The mixed materials are added to a twin-screw extruder for extrusion granulation, the temperature for extrusion granulation is 180°C, and the composite antistatic polypropylene plastic is obtained.

[0055] Comparative Example 2

[0056] A polypropylene plastic is prepared from the following raw materials in parts by mass:

[0057]

[0058] The preparation method of the modified graphene described above

[0059] The modified graphene is obtained by adding 1 part by mass of γ-methacryloxypropyl trimethoxysilane into a mixed solution prepared from 95 parts by mass of ethanol and 5 parts by mass of water, stirring uniformly, adding 10 parts by mass of graphene, uniformly ultrasonic dispersing, soaking for 22 hours, centrifugation, and freeze-drying.

[0060] The preparation method of the polypropylene plastic is as follows:

[0061] 1. The polypropylene resin, the modified graphene, the antioxidant, and the lubricant are added into a mixing pot, the rotating speed of the mixing pot is controlled to be 1000 r / min, and the mixture is uniformly mixed.

[0062] 2. The mixture is added into a double-screw extruder for extrusion granulation, the temperature for the extrusion granulation is 180°C, and the composite antistatic polypropylene plastic is obtained.

[0063] Comparative Example 3

[0064] A polypropylene plastic is prepared from the following raw materials in parts by mass:

[0065] Polypropylene resin 100 parts

[0066] Antioxidant 0.5 parts

[0067] Lubricant 2 parts.

[0068] The preparation method of the polypropylene plastic is as follows:

[0069] 1. The polypropylene resin, the antioxidant, and the lubricant are added into a mixing pot, the rotating speed of the mixing pot is controlled to be 1000 r / min, and the mixture is uniformly mixed.

[0070] 2. The mixture is added into a double-screw extruder for extrusion granulation, the temperature for the extrusion granulation is 180°C, and the composite antistatic polypropylene plastic is obtained.

[0071] Comparative Example 4

[0072] A composite antistatic polypropylene plastic is prepared from the following raw materials in parts by mass:

[0073]

[0074]

[0075] The preparation method of the modified graphene

[0076] The modified graphene is obtained by adding 1 part by mass of octadecylamine into a mixed solution prepared from 95 parts by mass of ethanol and 5 parts by mass of water, stirring uniformly, adding 10 parts by mass of graphene, uniformly ultrasonic dispersing, soaking for 22 hours, centrifugation, and freeze-drying.

[0077] The preparation method of the composite antistatic polypropylene plastic is as follows:

[0078] 1. Polypropylene resin, modified graphene, polyethylene glycol methacrylic acid copolymer, antioxidant and lubricant are added into a mixing pot, the rotating speed of the mixing pot is controlled at 1000 r / min, and the mixture is uniformly mixed;

[0079] 2. The mixture is added into a double-screw extruder for extrusion granulation, the temperature for the extrusion granulation is 180℃, and the composite antistatic polypropylene plastic is obtained.

[0080] The composite antistatic polypropylene plastics prepared in Examples 1-3 and the polypropylene plastics prepared in Comparative Examples 1-4 are tested, and the surface resistance, tensile strength and notched impact strength (low temperature-20℃) and other performance parameters of the polypropylene plastics are tested, the surface resistance is tested according to GBT 1410-2006 “Material Volume Resistivity and Surface Resistivity Test Method”, the tensile strength is tested according to GB / T 1040-1992 “Plastic Tensile Test Method”, and the notched impact strength is tested according to GBT1043.1-2008 “Simple Beam Impact Strength”, and the test results are shown in the following table:

[0081]

[0082]

[0083] As shown in the above table, when the modified graphene and the polyethylene glycol methacrylic acid copolymer are used as the composite antistatic agent, the antistatic effect of the polypropylene plastic is significantly improved, and the low-temperature toughness thereof can also be improved.

Claims

1. A method for improving the antistatic properties and low-temperature toughness of polypropylene plastic, characterized in that... Includes the following steps: S1. By weight, add 100 parts of polypropylene resin, 0.5-1.5 parts of modified graphene, 7-12 parts of polyethylene glycol methacrylate copolymer, 0.1-1 parts of antioxidant and 1-3 parts of lubricant to a mixer and mix at high speed. The modified graphene is prepared as follows: γ-methacryloxypropyltrimethoxysilane was added to a mixed solution of ethanol and water and stirred until homogeneous. Graphene was then added, with a mass ratio of γ-methacryloxypropyltrimethoxysilane to graphene of 0.5-1.5:

100. After being dispersed evenly, the mixture was soaked for 20-24 hours, centrifuged, and dried to obtain modified graphene. S2. The mixture is added to a twin-screw extruder for extrusion and granulation to obtain the composite antistatic polypropylene plastic.

2. The method for improving the antistatic properties and low-temperature toughness of polypropylene plastic according to claim 1, characterized in that: The mass ratio of ethanol to water in the mixed solution is 18-20:

1.

3. The method for improving the antistatic properties and low-temperature toughness of polypropylene plastic according to claim 1, characterized in that: The lubricant is selected from at least one of paraffin wax, polyethylene wax, and stearic acid.

4. The method for improving the antistatic properties and low-temperature toughness of polypropylene plastic according to claim 1, characterized in that: The antioxidant is selected from at least one of antioxidant 1010, antioxidant 168 and antioxidant 1076.

5. The method for improving the antistatic properties and low-temperature toughness of polypropylene plastic according to claim 1, characterized in that: The extrusion granulation temperature is 170~190℃.

6. A polypropylene plastic prepared by the method according to any one of claims 1-5.

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