CN111748148A

CN111748148A - Antistatic polypropylene material and preparation method thereof

Info

Publication number: CN111748148A
Application number: CN201910246554.2A
Authority: CN
Inventors: 杨桂生; 计娉婷; 朱敏; 廖雄兵
Original assignee: Hefei Genius New Materials Co Ltd
Current assignee: Hefei Genius New Materials Co Ltd
Priority date: 2019-03-28
Filing date: 2019-03-28
Publication date: 2020-10-09

Abstract

The invention discloses an antistatic polypropylene material which comprises the following components in percentage by weight: 77-89.4% of polypropylene, 10-20% of glassy carbon, 0.4-2% of antioxidant and 0.2-1% of processing aid. According to the invention, the glassy carbon modified polypropylene material is adopted, so that the antistatic property of the material is improved, the defects of environmental pollution and the like of the traditional antistatic material at present are overcome, and the safe and environment-friendly antistatic polypropylene is obtained and can be widely applied to household appliances and electronic and electric products.

Description

Antistatic polypropylene material and preparation method thereof

Technical Field

The invention relates to the technical field of polypropylene composite materials, in particular to an antistatic polypropylene material and a preparation method thereof.

Technical Field

The polypropylene is a thermoplastic engineering plastic with excellent performance, has the advantages of small density, no toxicity, easy processing, high impact strength and the like, the development speed of the dosage of the polypropylene is increased year by year, and particularly in recent years, due to the development of a polypropylene modification technology, the application field of the polypropylene is continuously expanded, and the development of the polypropylene industry is further promoted.

When two objects having different properties are rapidly peeled off after being rubbed or brought into close contact with each other, electron transfer occurs due to their different magnitudes of attraction to electrons. Some of the objects are positively charged by losing some of the electrons and others are negatively charged by gaining electrons. If the object is insulated from the ground, the charge cannot be derived, stays in the interior of the object or is in a relatively static state on the surface, and the charge is called static electricity.

Although polypropylene has many advantages, its molecular chain is non-polar, and it is easy to generate static electricity in application, which largely limits the application of polypropylene in some fields. One effective method for eliminating the static electricity of polypropylene is to add an antistatic agent for modification. Antistatic agents are classified into permanent antistatic agents and non-permanent antistatic agents. The non-permanent antistatic agent is mainly a hydrophilic substance and can migrate to the surface when being added into polypropylene to absorb water in the air so as to form a conductive loop, but the material does not have a conductive effect after the antistatic agent completely migrates and is completely consumed along with surface contact and abrasion in the use process. Most of the currently used permanent antistatic agents are conductive carbon black, and the addition amount of the conductive carbon black is higher, so that the influence on the performance of the material is larger. In addition, during the processing of the carbon black modified antistatic product, a large amount of carbon black particles are suspended in the air, which causes great harm to the bodies of operators and users.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an antistatic polypropylene material and a preparation method thereof.

An antistatic polypropylene material comprises the following components in percentage by weight:

77-89.4 percent of polypropylene,

10-20% of glassy carbon,

0.4 to 2 percent of antioxidant,

0.2 to 1 percent of processing aid.

The glassy carbon is a commercial product, is a novel carbon formed by gradually heating furfuryl alcohol resin or phenolic resin to over 1200 ℃ and carbonizing, and has a particle size of 0.4-12 mu m.

Preferably, the polypropylene has a melt index of 0.1 to 120g/10 min.

Preferably, the antioxidant is one or a mixture of more than two of an antioxidant 1010, an antioxidant 168 and thiodipropionic acid diol ester.

Preferably, the processing aid is one or a mixture of more than two of calcium stearate, zinc stearate and ethylene distearic acid amine.

The invention also provides a method for preparing the antistatic polypropylene material, which comprises the following steps: the raw materials are uniformly mixed in a high-speed mixer, and then added into a double-screw extruder for mixing and extrusion to obtain the antistatic polypropylene material. Wherein the mixing temperature of the high-speed mixer is 40-60 ℃, the mixing time is 5-20min, and the extrusion temperature in the double-screw extruder is 175-210 ℃.

The invention has the beneficial effects that:

the invention firstly proposes that the glassy carbon is selected as the antistatic modifier to overcome the defects in the prior art. The glassy carbon itself contains a banded graphitized structure of SP2 hybridized carbon atoms, which are stacked together, irregularly twisted and entangled, thus forming a material with high chemical properties and high electrical conductivity. And the environment hazard of the carbon black antistatic agent can not occur in the processing and using processes, so that the carbon black antistatic modified material can be regarded as a novel environment-friendly high-efficiency antistatic modified material.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be emphasized that these examples are only for the purpose of further illustration of the present invention and are not to be construed as limiting the scope of the present invention. Further, it should be understood that various changes or modifications can be made by those skilled in the art after reading the disclosure of the present invention, and equivalents fall within the scope of the appended claims.

Example 1:

83.5 parts of polypropylene with a melt index of 60g/10min, 15 parts of glassy carbon with a particle size of 0.4-12 mu m, 10100.5 parts of antioxidant, 1680.5 part of antioxidant and 0.5 part of processing aid calcium stearate are added into a high-speed mixer to be uniformly mixed, and then the mixture is added into a double-screw extruder to be mixed and extruded to obtain the antistatic polypropylene material. Wherein the mixing temperature of the high-speed mixer is 50 ℃, the mixing time is 10min, and the extrusion temperature of each double-screw extruder is 175-210 ℃, so as to obtain the antistatic polypropylene material.

Example 2:

86.8 parts of polypropylene with the melt index of 30g/10min, 12 parts of glassy carbon with the particle size of 0.4-12 mu m, 10100.4 parts of antioxidant, 0.4 part of thiodipropionic acid diol ester and 0.4 part of processing aid zinc stearate are added into a high-speed mixer to be uniformly mixed, and then added into a double-screw extruder to be mixed and extruded, so that the antistatic polypropylene material is obtained. Wherein the mixing temperature of the high-speed mixer is 45 ℃, the mixing time is 8min, and the extrusion temperature of each double-screw extruder is 175-210 ℃, so as to obtain the antistatic polypropylene material.

Example 3:

79.6 parts of polypropylene with the melt index of 80g/10min, 18 parts of glassy carbon with the particle size of 0.4-12 mu m, 1681.6 parts of antioxidant and 0.8 part of processing aid ethylene distearate are added into a high-speed mixer to be uniformly mixed, and then the mixture is added into a double-screw extruder to be mixed and extruded to obtain the antistatic polypropylene material. Wherein the mixing temperature of the high-speed mixer is 55 ℃, the mixing time is 18min, and the extrusion temperature of each double-screw extruder is 175-210 ℃, so as to obtain the antistatic polypropylene material.

Example 4:

77 parts of polypropylene with the melt index of 0.1g/10min, 20 parts of glassy carbon with the particle size of 0.4-12 mu m, 1682 parts of antioxidant and 1 part of processing aid ethylene distearate are added into a high-speed mixer to be uniformly mixed, and then the mixture is added into a double-screw extruder to be mixed and extruded to obtain the antistatic polypropylene material. Wherein the mixing temperature of the high-speed mixer is 60 ℃, the mixing time is 20min, and the extrusion temperature in the double-screw extruder is 175-210 ℃, so as to obtain the antistatic polypropylene material.

Example 5:

89.4 parts of polypropylene with a melt index of 120g/10min, 10 parts of glassy carbon with a particle size of 0.4-12 mu m, 10100.2 parts of antioxidant, 1680.2 parts of antioxidant and 0.2 part of processing aid calcium stearate are added into a high-speed mixer to be uniformly mixed, and then the mixture is added into a double-screw extruder to be mixed and extruded to obtain the antistatic polypropylene material. Wherein the mixing temperature of the high-speed mixer is 40 ℃, the mixing time is 5min, and the extrusion temperature of each double-screw extruder is 175-210 ℃, so as to obtain the antistatic polypropylene material.

The obtained product was subjected to experimental tests for tensile strength, flexural strength, notched impact strength and surface resistivity, and the test results are shown in table 1.

TABLE 1 mechanical Properties and surface resistivities of the antistatic Polypropylene materials prepared in examples 1 to 5 and the conventional antistatic Polypropylene materials

According to the results in the table, the surface resistance of the polypropylene material is lower than 10 by adding 10-20% of glassy carbon⁷The high-quality antistatic polypropylene material.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. The antistatic polypropylene material is characterized by comprising the following components in percentage by weight:

77-89.4 percent of polypropylene,

10-20% of glassy carbon,

0.4 to 2 percent of antioxidant,

0.2 to 1 percent of processing aid.

2. The antistatic polypropylene material of claim 1, wherein the melt index of the polypropylene is 0.1-120g/10 min.

3. The antistatic polypropylene material according to claim 1, wherein the glassy carbon has a particle size of 0.4 to 12 μm.

4. The antistatic polypropylene material as claimed in claim 1, wherein the antioxidant is one or a mixture of more than two of 1010 antioxidants, 168 antioxidants and thiodipropionic acid diol esters.

5. The antistatic polypropylene material of claim 1, wherein the processing aid is one or a mixture of two or more of calcium stearate, zinc stearate and ethylene distearic acid amine.

6. A process for preparing an antistatic polypropylene material according to any one of claims 1 to 5, comprising the steps of: the raw materials are uniformly mixed in a high-speed mixer, and then added into a double-screw extruder for mixing and extrusion to obtain the antistatic polypropylene material.

7. The method for preparing an antistatic polypropylene material according to claim 6, wherein the method comprises the following steps: the mixing temperature of the high-speed mixer is 40-60 ℃, the mixing time is 5-20min, and the extrusion temperature in the double-screw extruder is 175-210 ℃.