Polyolefin material with high thermal shrinkage resistance, high toughness and thermo-oxidative aging resistance as well as preparation method and application thereof

Abstract

The invention provides a polyolefin material with high thermal shrinkage resistance, high toughness and thermo-oxidative aging resistance as well as a preparation method and application thereof. The polyolefin material comprises the following components in parts by weight: 17-19 parts of LLDPE (Linear Low Density Polyethylene), 15-20 parts of EAA (Ethylene Acrylic Acid), 5-10 parts of POE (Polyolefin Elastomer), 35-50 parts of an ammonia modified halogen-free flame retardant, 3-10 parts of a compatilizer, 3-5 parts of a dispersing agent, 0.2-0.8 part of an antioxidant and 0-2 parts of other additives, and in the ammonia modified halogen-free flame retardant, the halogen-free flame retardant is one or a combination of two of magnesium hydroxide or aluminum hydroxide. Under the interaction of the ammonia-modified aluminum hydroxide or magnesium hydroxide halogen-free flame retardant and EAA and POE in a resin matrix, the heat shrinkage resistance, toughness and thermo-oxidative aging resistance of the polyolefin material can be improved at the same time, and the polyolefin material can be used for a long time in a higher temperature environment as a cable protection material.

Description

technical field [0001] The invention belongs to the technical field of engineering plastics, and in particular relates to a high thermal shrinkage, high toughness thermal oxygen aging polyolefin material and a preparation method and application thereof. Background technique [0002] With the development of electronic information technology, it has driven the development of the wire and cable industry. Cables are used to protect the metal circuits in them and are often used in harsh environmental conditions, such as high and low temperature, strong ultraviolet radiation, high ozone concentration, chemical corrosion, etc. In harsh environments, cable protection materials are prone to aging, becoming brittle, or even decomposed, resulting in exposed cable materials, which can easily lead to major disasters such as short circuits and fires. [0003] Polyolefin is a commonly used cable protective sheath material. By modifying the matrix or adding functional additives such as fla...

AI Technical Summary

Problems solved by technology

[0004] The existing heat-resistant shrinkage modification of polyolefin cable protection materials is mainly modified by adding inorganic substances, such as the patent "An Inorganic Modified High Heat-Resistant, Low Shrinkage, Low-Smoke, Halogen-Free, Flame-Retardant Polyolefin Cable Material and Its Preparation Method" The shrinkage performance of the entire material is improved by adding surface-modified inorganic montmorillonite and metallocene linear low-density polyethylene, but the surface-modified inorganic montmorillonite has limited compatibility with the resin matrix, which will lead to The mechanical strength of the material decreases, such as the impact strength decreases, it is prone to cracking, which is easy to cause short circuit or even fire; and poor compatibility will also lead to a decrease in the thermal oxygen aging resistance of the system

Therefore, there are still some difficulties in simultaneously improving the thermal shrinkage performance, toughness, and thermo-oxidative aging performance of polyolefin cable protection materials.

[0005] Although our company has researched low-shrinkage flame-retardant polyolefin materials before, the research is on the molding shrinkage properties of the materials during processing and after molding (that is, the size after molding is compared with the size of the mold), so it is not suitable for use. After the material is molded, under high heat conditions during use, the material is also accompanied by thermal oxygen aging at high temperature, which will cause complex changes in the shrinkage properties of the material. Therefore, when the material is in a high heat environment for a long time, it is cooled to room temperature (25-30°C) (that is, in a wide temperature range) can still have low shrinkage performance is still a difficulty in the industry

Images