Thermo-oxidative aging resistant regenerated polyethylene material as well as preparation method and application thereof
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A technology of recycled polyethylene and polyethylene, which is applied in the field of recycling of renewable resources, can solve the problems of limiting the use range of optical cable sheaths, affecting the service life of optical cable sheaths, and large changes in elongation at break and tensile strength. Achieve excellent thermal and oxidative aging resistance
Pending Publication Date: 2021-05-04
KINGFA SCI & TECH CO LTD +1
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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 polyeth
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Embodiment 1～5
[0055] The contents of each component in the composite antioxidant masterbatches of Examples 1-5 are shown in Table 1.
[0056] Its preparation method is:
[0057] After mixing polyethylene, antioxidant, metal deactivator, nucleating agent and second lubricant according to Table 1, add them to the extruder, melt and mix, extrude and granulate to obtain the composite antioxidant Masterbatch.
[0058] The component content (parts by weight) of the composite antioxidant masterbatch of table 1 embodiment 1~5
[0059]
Embodiment 6～15
[0061] The content of each component in the recycled polyethylene materials of Examples 6-15 is shown in Table 1.
[0062] Its preparation method is:
[0063] According to Table 2, after mixing regenerated high-density polyethylene particles, regenerated low-density polyethylene particles, carbon black masterbatches, compatibilizers, composite antioxidant masterbatches, and the first lubricant, add them to the extruder, and melt Mixing, extruding and granulating to obtain the regenerated polyethylene material resistant to thermal and oxidative aging.
[0064] Among them, the extruder is a twin-screw extruder 75D, equipped with a dual-channel non-stop screen changer, the filter screen is 80-120 mesh; the extrusion temperature is 190-210°C, the screw speed is 450-550HZ, and the feeding amount is 350~400kg / h.
[0065] The component content (weight part) of the regenerated polyethylene material of table 2 embodiment 6~15
[0066]
[0067]
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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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