High-flexibility polyamide natural gas pipe material and preparation method thereof

A natural gas pipe and polyamide technology, which is applied in the field of highly flexible polyamide natural gas pipe materials and their preparation, can solve problems such as corrosion of metal pipes, and achieve the effects of excellent low temperature toughness, excellent heat resistance and weather resistance

Pending Publication Date: 2021-09-03
SHANGHAI CHANGWEI JINCI ENG PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, metal pipelines are facing increasingly serious corrosion problems, which bring huge risks and pressures to pipeline maintenance and operation

Method used

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  • High-flexibility polyamide natural gas pipe material and preparation method thereof
  • High-flexibility polyamide natural gas pipe material and preparation method thereof
  • High-flexibility polyamide natural gas pipe material and preparation method thereof

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Effect test

preparation example Construction

[0052] The preparation method of the highly flexible polyamide natural gas pipe material described in Embodiments 1 to 4 of the present invention comprises the following steps:

[0053] Stir and mix the toughening agent, heat stabilizer, weather resistance additives and additives evenly to obtain a mixture;

[0054] Stir and mix the dried polyamide with the plasticizer evenly, and then stir and mix with the above mixture evenly, so that the powdery additives such as additives are evenly adhered to the surface of the polyamide by means of the plasticizer. Then feed it into the twin-screw extruder through the main feeding port, and control the temperature of each section of the twin-screw extruder, from the feeding port to the exit of the head, the temperature is 180°C, 200°C, 225°C, 225°C, 230°C, 230°C , 230°C, 230°C, 230°C, 230°C, 230°C, the melt-extruded strands are cooled, dried, and then pelletized to obtain the highly flexible polyamide natural gas pipe material.

[0055]...

Embodiment 3

[0075] The organic copper salt heat stabilizer added in Example 3 has a larger molecular weight, better stability and higher anti-oxidation efficiency, and the material still has a very high strength retention rate under the aging condition of 130 ° C. The strength retention rate is as high as 123%, the elongation at break retention rate is also as high as 45%, and the relative viscosity is also maintained at about 67%, indicating that the organic copper salt H3386 can effectively reduce the loss of mechanical properties under high temperature aging conditions in materials, so this high Flexible natural gas pipe materials can be used for a long time at higher temperatures.

[0076] Embodiment 3 compares with comparative examples 2 and 3 and finds that comparative example 2 does not add heat stabilizers, and comparative example 3 does not add heat stabilizers and weather resistance additives. Heat and other effects make the physical and chemical properties of the material conti...

Embodiment 4

[0078] Example 4 has the same formula as Example 3, mainly because the substrate is replaced by PA616 with longer carbon chain PA618. PA618 is obtained by polycondensation of hexamethylenediamine and 18-carbon dibasic acid, but due to the relatively high reactivity of 18-carbon dibasic acid Low, and the hydrogen bond density of PA618 is lower than that of PA616, so the tensile strength and bending strength of the material are lower, but the low hydrogen bond density also makes the material more flexible and has better low temperature toughness.

[0079] Considering the performance requirements of natural gas pipe materials on strength, flexibility, and aging resistance, both Example 3 and Example 4 meet the material requirements, and Example 3 has better comprehensive performance.

[0080] The weather resistance additive of the present invention is composed of hindered phenolic antioxidant, hindered amine light stabilizer, benzotriazole ultraviolet absorber and phosphite antiox...

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Abstract

The invention discloses a high-flexibility polyamide natural gas pipe material which is prepared from the following components in parts by weight: 70-94 parts of polyamide, 4-20 parts of a toughening agent, 2-15 parts of a plasticizer, 0.3-1.5 parts of a heat stabilizer, 0.4-1 part of weather-resistant auxiliaries and 0.3-1 part of an additive. The high-flexibility polyamide natural gas pipe material has very excellent flexibility and excellent aging resistance, and the technical problem to be solved is to select PA616, PA618 and other long-carbon-chain nylon as main raw materials and improve the toughness of the material in a toughening and plasticizing manner, so that the material has excellent low-temperature toughness. By adding the heat stabilizer and the weather-resistant auxiliaries, the material has excellent heat resistance and weather resistance and can be widely applied to natural gas pipelines.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a highly flexible polyamide natural gas pipe material and a preparation method thereof. Background technique [0002] With the wide application of compressed natural gas resources in our country, when long-distance pipeline transportation is realized, due to pressure and other problems, quite high requirements are put forward for the technical indicators of the pipeline material. Traditional non-metallic natural gas pipelines mostly use polyethylene gas pipes, and now polyethylene gas pipes have been developed to the third generation, especially the ability to resist crack growth has been significantly improved. However, for pipelines with sub-high pressure section and above, polyethylene and metal pipelines have their own problems. According to the requirements of relevant technical standards, the maximum allowable working pressure of polyethyle...

Claims

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Application Information

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IPC IPC(8): C08L77/06C08L51/06C08L23/30C08K5/134C08K5/00
CPCC08L77/06C08L2203/18C08L2201/08C08L51/06C08L23/30C08K5/1345C08K5/005
Inventor 李玉增赵志刚程方清
Owner SHANGHAI CHANGWEI JINCI ENG PLASTIC
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