CN-118406312-B - Polypropylene composite material with excellent hydrophobicity and chemical resistance and preparation method thereof

Abstract

The invention discloses a polypropylene composite material with excellent hydrophobicity and chemical resistance and a preparation method thereof, wherein the polypropylene composite material is prepared from 82.2-93.1 parts by weight of polypropylene, 4-10 parts by weight of linear low density polyethylene, 2-5 parts by weight of polyvinylidene fluoride, 0.5-2 parts by weight of multi-wall carbon nano tube, 0.2-0.4 part by weight of heat stabilizer and 0.2-0.4 part by weight of processing aid. According to the invention, polyvinylidene fluoride is added into polypropylene, LLDPE and MWCNTs are added simultaneously to realize synergistic effect, so that the effects of hydrophobicity and chemical resistance are achieved, the prepared polypropylene can reach the level that the water contact angle is more than 105 degrees, and the effect of resisting the wiping of chemicals such as gasoline, engine oil and the like without whitening is achieved, and the application field of the polypropylene is enlarged.

Inventors

• JI PINTING
• ZHU MIN
• ZHAO XIN
• LIAO XIONGBING
• YANG GUISHENG
• YAO CHENGUANG
• ZOU CHONG

Assignees

• 合肥杰事杰新材料股份有限公司

Dates

Publication Date

20260505

Application Date

20230130

Claims (5)

1. 1. A polypropylene composite material with excellent hydrophobicity and chemical resistance is characterized by being prepared from the following components in parts by weight: 82.2 to 93.1 parts of polypropylene, 4-10 Parts of linear low-density polyethylene, 2-5 Parts of polyvinylidene fluoride, 0.5-2 Parts of multiwall carbon nanotube, 0.2 To 0.4 part of heat stabilizer, 0.2-0.4 Part of processing aid; the linear low-density polyethylene is prepared by a metallocene catalyst, and the melt index of the linear low-density polyethylene under the test condition of 2.16kg at 190 ℃ is 5-30g/10min; The diameter of the multi-wall carbon nano tube is 10-20nm; the processing aid is at least one of calcium stearate, zinc stearate and erucamide.
2. 2. The polypropylene composite material excellent in hydrophobicity and chemical resistance according to claim 1, wherein the polypropylene has a melt index of 3 to 120g/10min under a test condition of 230 ℃ and 2.16 kg.
3. 3. The polypropylene composite material with excellent hydrophobicity and chemical resistance according to claim 1, wherein the heat stabilizer is at least one of phenols, amines, phosphites, complexes of acryl functional groups and thioesters, and calixarene heat stabilizers.
4. 4. A process for the preparation of a polypropylene composite material having excellent hydrophobic and chemical resistance properties as claimed in any one of claims 1 to 3, comprising the steps of: Uniformly mixing polypropylene, linear low-density polyethylene, polyvinylidene fluoride, multi-wall carbon nano tube, heat stabilizer and processing aid according to a proportion, adding the obtained mixture into a double-screw extruder for melt mixing and dispersing, extruding and granulating, thus obtaining the polypropylene composite material with excellent hydrophobicity and chemical resistance.
5. 5. The method for producing a polypropylene composite excellent in hydrophobicity and chemical resistance according to claim 4, wherein the processing temperature of the twin-screw extruder is 200 to 230℃and the aspect ratio is 36 to 40:1.

Description

Polypropylene composite material with excellent hydrophobicity and chemical resistance and preparation method thereof Technical Field The invention relates to the technical field of modification of high polymer materials, in particular to a polypropylene composite material with excellent hydrophobicity and chemical resistance and a preparation method thereof. Background Polypropylene is a universal plastic and is widely used in materials in various fields, and is characterized by having wide application in fields of household appliances, electric appliances and the like. The plastic parts used for the shells of household appliances, bathroom products and medical products are made of polypropylene materials, but bacteria are easy to grow under the condition of long-term contact with water, and if the materials have good hydrophobic performance, water is not easy to store, so that the growth of the bacteria is prevented. With the current improvement of life quality of people, health problems are increasingly concerned, and greater demands are made on the preparation of functionalized polypropylene. On the other hand, the polypropylene material is used in the use process of the product, and is inevitably contacted with chemicals such as oil, cleaning agent and the like, the traditional polypropylene material has poor chemical resistance, and in the long-term use process, the phenomenon that the original bright product is corroded to be fogged and whitened on the surface can be caused, so that the appearance of the product and the use feeling of a customer are greatly influenced. Disclosure of Invention Aiming at the problems in the prior art, the invention aims to provide a polypropylene composite material with excellent hydrophobicity and chemical resistance and a preparation method thereof, the polypropylene composite material prepared by the invention has the advantages of hydrophobic property, has good chemical resistance and good corrosion resistance even if the gasoline and kerosene are strong chemicals with strong destructiveness to polypropylene materials. The aim of the invention is realized by the following technical scheme: a polypropylene composite material with excellent hydrophobicity and chemical resistance is prepared from the following components in parts by weight: Wherein: The melt index of the polypropylene under the test condition of 230 ℃ and 2.16kg is 3-120g/10min. The linear low density polyethylene is prepared by a metallocene catalyst, and the melt index of the linear low density polyethylene under the test condition of 190 ℃ C2.16kg is 5-30g/10min. The diameter of the multiwall carbon nanotube is 10-20nm. The heat stabilizer is at least one of phenols, amines, phosphites, semi-hindered phenols, complexes of acryl functional groups and thioesters and calixarene heat stabilizers. The processing aid is at least one of calcium stearate, zinc stearate and erucamide. The invention also discloses a preparation method of the polypropylene composite material with excellent hydrophobicity and chemical resistance, which comprises the following steps: Uniformly mixing polypropylene, linear low-density polyethylene, polyvinylidene fluoride, multi-wall carbon nano tube, heat stabilizer and processing aid according to a proportion, adding the obtained mixture into a double-screw extruder for melt mixing and dispersing, extruding and granulating, thus obtaining the polypropylene composite material with excellent hydrophobicity and chemical resistance. Preferably, the processing temperature of the twin-screw extruder is 200-230 ℃ and the length-diameter ratio is 36-40:1. Compared with the prior art, the invention has the beneficial effects that: (1) The invention selects linear low density polyethylene, polyvinylidene fluoride and multi-wall carbon nano tube material as hydrophobic and chemical resistant modification auxiliary agent, the raw materials are simple and easy to purchase, the price is moderate, the preparation is prepared by a double screw melt blending processing mode, the steps are simple, the price is low, and the invention is suitable for large-scale industrial production; (2) The polyvinylidene fluoride PVDF has very low surface activity, fluorine-containing surface structure and hydrophobic property, linear low-density polyethylene LLDPE is selected for matching modification, so that the compatibility of PVDF and matrix polypropylene can be increased, LLDPE with higher melt index is selected as a modifier, the fluidity is good, PVDF can be carried and filled into the defect cavity and the surface layer in the modified polypropylene, so that when the material contacts with a chemical reagent, the chemical reagent is prevented from corroding into the base material of the polypropylene material, the polyethylene has a more regular main chain structure and has better chemical reagent resistance, and meanwhile, the modified polypropylene has hydrophobic property and has a larger water co