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Polyethylene resin composition and pipe material, pipe and joint containing same

A technology of polyethylene resin and composition, which is applied in the direction of pipes/pipe joints/fittings, pipes, rigid pipes, etc., and can solve problems such as brittle damage and stress concentration

Active Publication Date: 2020-10-27
HITACHI-GE NUCLEAR ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The pipe material made of polyethylene receives stress from the pressure inside the pipe and the earth pressure from the outside when it is buried. Therefore, it is known that if there is a minute defect in the pipe, the stress will concentrate there and cause brittle damage.

Method used

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  • Polyethylene resin composition and pipe material, pipe and joint containing same
  • Polyethylene resin composition and pipe material, pipe and joint containing same
  • Polyethylene resin composition and pipe material, pipe and joint containing same

Examples

Experimental program
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Effect test

Embodiment 1

[0131] This embodiment relates to a polyethylene resin composition having the first feature.

[0132] In this embodiment, high-density polyethylene is used as the base material. This base material contained 0.5 mass parts of titanium oxide with respect to 100 mass parts of polyethylene resins. Here, HDPE is manufactured using a Ziegler catalyst with a density of 0.95 g / cm 3 , The melt flow rate is 0.5g / 10 minutes.

[0133] Furthermore, one or more types of additives (A), (B), (C) and (D) are mixed in the base material. At this time, the mixture was kneaded at a temperature of 150° C. for 10 minutes using a Banbury mixer, and then pelletized to obtain polyethylene resin composition pellets.

Embodiment 2

[0135] This embodiment relates to a polyethylene resin composition having the second feature.

[0136] In this embodiment, high-density polyethylene is used as the base material. This base material contained 0.5 mass parts of titanium oxide with respect to 100 mass parts of polyethylene resins. Here, HDPE is manufactured using a Ziegler catalyst with a density of 0.94 g / cm 3 More than 0.97g / cm 3 range.

[0137] Furthermore, the base material is mixed with an oil containing naphthenes in which the %CN of ring analysis by the n-d-M method is 20% or more and 100% or less among oils produced when refining naphthene-based crude oil. At this time, the mixture was kneaded at a temperature of 180° C. for 10 minutes using a Banbury mixer, and then pelletized to obtain polyethylene resin composition pellets.

[0138] However, in Examples 1 and 2, polyethylene resin composition pellets were supplied to an injection molding machine, and a 1B-type dumbbell-shaped test piece described i...

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Abstract

The present invention provides a polyethylene resin composition, and a pipe material, pipe, and joint containing the same, which prevent brittle fracture cracking and stress cracking, which are essential defects of polyethylene. The polyethylene resin composition contains a base material mainly composed of polyethylene and an additive. The additive contains a non-polar substance that is liquid at room temperature. The ratio of the additive is 0.1-10 parts by mass relative to 100 parts by mass of polyethylene.

Description

technical field [0001] The present invention relates to polyethylene resin compositions and pipe materials, pipes and joints containing the same. Background technique [0002] Pipes made of polyethylene are used to transport various fluids. Examples thereof include water and sewage pipes, gas pipes, water supply pipes, hot water supply pipes, chemical liquid pipes, and oil pipes. The safety requirements for various pipes are increasing year by year, so pipes made of PE80 are used for gas pipes, and pipes made of PE100 are used for water and sewage pipes. In addition, cross-linked polyethylene with excellent heat resistance is used as the piping material for the hot water supply pipe. Furthermore, polyethylene pipes also use polyethylene joints, which have a feature that the polyethylene pipes and polyethylene joints can be integrated by a welding joint called electrofusion. [0003] The pipe material made of polyethylene receives stress from the pressure inside the pipe a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L91/00
CPCC08L23/06C08L2207/062C08L2203/18C08L2205/025C08L2205/03C08L2205/035C08L2205/02C08L91/00C08L91/06C08K5/01F16L9/12C08K3/22C08K2003/2241Y02E30/30G21C19/00
Inventor 本棒享子寺尾圭论永田纯也
Owner HITACHI-GE NUCLEAR ENERGY LTD