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Low-temperature-resistant high-strength polyethylene material and preparation method thereof

A high-strength polyethylene, low-temperature-resistant technology, applied in the field of organic polymer materials, can solve the problems of decreased material strength, unstable material mechanical properties, and high price

Pending Publication Date: 2021-05-04
LIAOYANG KANGDA PLASTIC RESIN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are many ways to toughen low-temperature polyethylene. Polyolefin elastomer POE, EPDM, etc. are used to toughen polyethylene. However, when the temperature is low to a certain condition (-35°C), the material strength drops significantly. , cold resistance is not very prominent
The POE and EPDM that can be used below (-45°C) are also limited, and the price is high, and the mechanical properties of the material are not stable

Method used

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  • Low-temperature-resistant high-strength polyethylene material and preparation method thereof
  • Low-temperature-resistant high-strength polyethylene material and preparation method thereof

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preparation example Construction

[0031] The present invention also provides a method for preparing a low-temperature-resistant high-strength polyethylene material, comprising the following steps:

[0032] A) fully mixing the toughening agent and the plasticizer, and standing for 24 to 48 hours to obtain a blend;

[0033] B) mixing the polyethylene, antioxidant, ultraviolet absorber and the blend obtained in the step A), extruding and granulating to obtain a low-temperature-resistant high-strength polyethylene material.

[0034] In the present invention, in the step B), the blending temperature of the torque rheometer is preferably 200-300°C, more preferably 220-280°C, most preferably 220-250°C; the time It is preferably 1-20 min, more preferably 3-15 min, most preferably 5-10 min, and the rotational speed of the torque rheometer is preferably 10-200 rpm, more preferably 30-150 rpm, most preferably 50-100 rpm.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] ...

Embodiment 1

[0041] Formula: Low temperature resistant high-strength polyethylene material formula is as follows: 84 parts of high-density polyethylene, 8 parts of SEBS, 8 parts of mineral oil, 0.6 parts of antioxidant 1010, and 0.2 parts of ultraviolet absorber.

[0042] Preparation method: first blend SEBS with mineral oil, and then use it after standing for 24-48 hours, mix polyethylene and SEBS with mineral oil blend, antioxidant, and UV absorber, and then add XXS-300 torque For the rheometer, the temperature of the torque rheometer is set to 220° C., the rotation speed is 50 rpm, and the blending time is 5 min. Then use a flat vulcanizer to press the tablet to make an impact sample. The temperature is 190°C, preheat for 3 minutes, pressurize for 15s, exhaust in the middle, and press for 3 minutes at a pressure of 10MPa. Then change the cold press and keep the pressure at 10MPa. , cold pressing time 8min. Press the impact template with a thickness of 3.2 mm, and then cut it into impac...

Embodiment 2

[0044] Formula: Low temperature resistant high-strength polyethylene material formula is as follows: 80 parts of high-density polyethylene, 10 parts of SEBS, 10 parts of mineral oil, 0.6 parts of antioxidant 1010, and 0.2 parts of ultraviolet absorber.

[0045] Preparation method: first blend SEBS with mineral oil, and then use it after standing for 24-48 hours, mix polyethylene and SEBS with mineral oil blend, antioxidant, and UV absorber, and then add XXS-300 torque For the rheometer, the temperature of the torque rheometer is set to 220° C., the rotation speed is 50 rpm, and the blending time is 5 min. Then use a flat vulcanizer to press the tablet to make an impact sample. The temperature is 190°C, preheat for 3 minutes, pressurize for 15s, exhaust in the middle, and press for 3 minutes at a pressure of 10MPa. Then change the cold press and keep the pressure at 10MPa. , cold pressing time 8min. Press the impact template with a thickness of 3.2 mm, and then cut it into imp...

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Abstract

The invention provides a low-temperature-resistant high-strength polyethylene material. The low-temperature-resistant high-strength polyethylene material is prepared from the following raw materials in percentage by mass: 70-90% of polyethylene, 5-14% of a flexibilizer, 5-14% of a plasticizer, 0.1-1% of an antioxidant, 0.1-0.2% of an ultraviolet absorbent, 0-10% of filler and 0-1% of a lubricant, the flexibilizer is a hydrogenated styrene-butadiene block copolymer and / or a hydrogenated styrene isoprene copolymer; and the plasticizer is mineral oil or heat-conducting oil. According to the invention, SEBS and mineral oil such as white oil are blended to carry out toughening modification on a polymer together, and the prepared material still keeps the impact strength greater than 80KJ / m < 2 > at the extremely low temperature of -45 DEG C. In addition, production equipment is simple, and preparation can be completed on a single-screw extruder and a double-screw extruder. The invention also provides a preparation method of the low-temperature-resistant high-strength polyethylene material.

Description

technical field [0001] The invention belongs to the technical field of organic polymer materials, and in particular relates to a low-temperature-resistant high-strength polyethylene material and a preparation method thereof. Background technique [0002] The use of pipelines to transport oil and natural gas is currently the most convenient, fastest, and lowest-cost way of oil and natural gas transportation. my country has built the first oil pipeline since 70 years. After nearly 50 years of construction, more than 20,000 kilometers have been built. Oil pipeline pipeline. However, the anti-corrosion technology of pipelines and prolonging the service life of pipelines are one of the technical difficulties of globalization, and are the focus of widespread attention in science and technology and engineering design. When the polyethylene used in anti-corrosion materials encounters extremely harsh low-temperature environments, it will rupture and lose its thermal insulation and an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L91/00C08L53/02C08K5/134
CPCC08L23/06C08L2207/062C08L2205/03C08L91/00C08L53/025C08K5/1345
Inventor 曹迪曹汉平关冲金晶高云宝姜伟
Owner LIAOYANG KANGDA PLASTIC RESIN