Pipe composition with high heat resistance and creep resistance and preparation method thereof

Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a pipe composition with high heat resistance and creep resistance and a preparation method thereof. The pipe composition comprises the following components in parts by weight: 60-80 parts of polyethylene, 20-40 parts of ultrahigh molecular weight polyethylene, 10-15 parts of nylon, 5-15 parts of a compatilizer, 5-10 parts of a silicon / aluminum composite reinforcing agent, 1-1.5 parts of a nucleating agent, and 1-3 parts of a lubricant. According to the invention, polyethylene is adopted as basic resin, nylon and the silicon / aluminum composite reinforcing agent are added, close integration is achieved through the compatilizer, and under the action of the nucleating agent, the crystal form of the system can be changed, and the crystal structure of the material is changed, so that the stress resistance of the pipe is changed, and the creep resistance is improved. By adding the silicon / aluminum composite reinforcing agent, the Vicat softening temperature is increased, the processability is improved, and the prepared polyethylene pipe has good temperature resistance and creep resistance.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a pipe composition with high heat resistance and creep resistance and a preparation method thereof. Background technique [0002] Polyethylene (PE) is a thermoplastic with excellent properties. It has good chemical corrosion resistance, low temperature impact resistance, etc. It is widely used in textiles, electric power, construction, coal, transportation and other fields. However, polyethylene cannot withstand high service temperature, and its processing mechanical strength is low, which limits its application in many fields. In the field of oilfield lined pipes, polyethylene pipes are required to have a Vicat softening temperature above 130°C, and at the same time require high tensile strength, elongation at break, impact performance, and creep resistance. Only in this way can the service life of the pipe be extended. Some data show that the Vicat softe...

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Problems solved by technology

Although cross-linking can increase the Vicat softening temperature, the creep resistance and wear resistance of the polyethylene material after cross-linking modification are reduced, and the service life is shortened; glass microspheres can increase the Vicat softening point temperature of PE, but glass microspheres The addition of not only reduces the performance of the material, but also makes the processing performance worse

[0003] Patent CN201510416076.7 Ultra-high molecular weight polyethylene alloy material with high softening point and its preparation method, the base resin used is ultra-high molecular weight polyethylene (UHMWPE) resin and nylon (PA) resin, and the reinforcing agent is inorganic nano-calcium , used to improve the Vicat softening point and melting index of the material, which has the characteristics of high heat distortion temperature and fast rebound speed, but the Vicat softening temperature of the final prepared material is still low, and the mechanical properties are not good

[0004] The literature "Preparation and Performance Research of UHMWPE / HDPE / PA1012 Composite Materials" (Plastic Industry, October 2016, Volume 44, Issue 10) uses three basic resins: HDPE (high density polyethylene), UHMWPE and PA , but the literature only examines the effect of the ratio of HDPE to UHMWPE on the properties of composites

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