Thermo-oxidative aging resistant regenerated polyethylene material as well as preparation method and application thereof

Abstract

The invention discloses a thermo-oxidative aging resistant regenerated polyethylene material as well as a preparation method and application thereof. The regenerated polyethylene material comprises the following components: regenerated high-density polyethylene, regenerated low-density polyethylene, carbon black master batch, a compatilizer, a first lubricant and composite antioxidant master batch, wherein the melt index of the regenerated high-density polyethylene is 0.2-0.6 g / 10min, and the melt index of the regenerated low-density polyethylene is 1.0-2.0 g / 10min; the crystallization temperature of the regenerated low-density polyethylene is 80-105 DEG C, and the peak value of the crystallization temperature is less than or equal to 95 DEG C; and the composite antioxidant master batch comprises the following components: polyethylene, an antioxidant, a metal deactivator, a nucleating agent and a second lubricant. Through the synergistic effect of the regenerated high-density polyethylene, the regenerated low-density polyethylene, the composite antioxidant master batch and other components, the prepared regenerated polyethylene material has excellent thermo-oxidative aging resistance, and the change rate of the elongation at break and the change rate of the tensile strength after thermo-oxidative aging at 110 DEG C are both smaller than or equal to 5%.

Description

technical field [0001] The invention relates to the field of recycling and utilization of renewable resources, and more specifically relates to a thermal-oxidative aging-resistant recycled polyethylene material, a preparation method and application thereof. Background technique [0002] Recycled polyethylene sheathing material has been recognized by the market for its excellent cost performance, and is widely used in the optical cable industry to make optical cable sheaths, making great contributions to reducing industry costs and resource recycling. Due to the fierce competition in the market, the performance requirements for optical cable sheath materials are getting higher and higher, such as appearance, environmental stress crack resistance, oxidation induction period, etc., are required to meet the requirements of the national standard GB15065. However, due to the influence of factors such as complicated sources of polyethylene recycling, backward pre-treatment technolo...

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Problems solved by technology

However, due to the influence of factors such as the complicated sources of polyethylene recycling, backward pretreatment technology, and equipment limitations, the semi-finished products after recycling and granulation have some thorny problems, such as poor thermal and oxygen aging resistance, etc.

The poor thermal oxygen aging resistance makes the mechanical properties of polyethylene materials severely attenuated after thermal oxygen aging. Compared with before thermal oxygen aging, the breaking elongation and tensile strength change rate of polyethylene materials are ≥10%, which limits the optical cable sheath. The scope of use affects the service life of the cable sheath

[0003] Chinese patent application CN102492200A discloses a cable sheath material based on recycled polyethylene, including the following components: recycled polyethylene, channel black, antioxidant, lubricant, softener, the patent prepared Although the optical cable sheath material meets the requirements of the national standard GB15065, it does not solve the problem of poor thermal oxidation resistance

Chinese patent application CN102643468A discloses a recycled polyethylene resin composition for sheath production, including polyethylene water pipe recycled materials, polyethylene bottle cap recycled materials, LLDPE film recycled materials, ethylene-vinyl acetate copolymer, antioxidant agent, carbon black masterbatch and other components, the recycled polyethylene resin composition still has high elongation at break and absolute value of tensile strength after thermo-oxidative aging, but elongation at break and tensile strength before and after aging The rate of change in intensity is still large

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