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A rigid-tough balance polyethylene composition

A technology of polyethylene and composition, applied in the field of polyethylene materials, can solve the problems of poor elongation at break and the weight of the composition, and achieve the effects of low cost, low weight and good rigidity

Active Publication Date: 2017-08-25
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of the invention has high meter weight, poor impact toughness, compressive strength, elongation at break, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~8

[0023] The proportioning components of the rigid-tough balanced polyethylene composition are shown in Table 1.

[0024] Density is tested according to GB / T 1033.2-2010, using D method, tested after boiling for 30 minutes; melt mass flow rate (MFR) is tested according to GB / T 3682-2000, with a load of 21.6kg; infrared spectroscopy is used to test the resin Relative branching degree, at 1378cm －1 and 2019 cm －1 The area ratio of the absorption peak at the place is calculated; the crystallinity is carried out according to GB / T19466.3-2004, and the heating and cooling rate is 10°C / min; the lamella thickness (L c ) is calculated according to the Hoffman-Weeks equation:

[0025] L c =2σ e T m 0 / ΔH u (T m 0 -T m )

[0026] In the equation, T m 0 is the equilibrium melting point of polyethylene, which is taken as 418.2K; σ e is the side surface free energy of polyethylene crystal, which is taken as 90*10 -3 J / m 2 ; ΔH u It is the melting enthalpy of polyethylene idea...

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PUM

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Abstract

A polyethylene composition with balanced rigidity and toughness, characterized in that the composition in parts by weight is: 88-93 parts of polyethylene resin a, 7-12 parts of polyethylene resin b, 0.1-0.4 parts of antioxidant, carbon black mother 0.5-3.5 parts of grains, 0.05-0.15 parts of acid absorbing agent; wherein, the polyethylene resin a is a copolymer of ethylene and 1-butene and / or 1-hexene, with a density of 0.951-0.955 g / cm3; The melt mass flow rate is 4.5~5.5g / 10min; the relative degree of branching is 0.04~0.08; the degree of crystallinity is 67~70%; the lamella thickness is 21~24nm; Copolymer of hexene, the density is 0.916~0.920g / cm3; the melt mass flow rate is 41~47g / 10min. The invention obtains a composition with good rigidity, flexibility, thermal stability and pressure resistance through the interaction of two polyethylene resins.

Description

technical field [0001] The invention discloses a polyethylene composition with balanced rigidity and toughness, which belongs to the field of polyethylene materials. Background technique [0002] At present, the large-diameter pipes used in domestic municipal drainage and sewage systems mainly use double-wall corrugated pipes and stretched winding pipes, with a diameter of not less than 500mm. Such tubing requires a high ring stiffness but also a certain ring flexibility. Polyethylene pipes have the characteristics of light weight, good corrosion resistance, low resistance, and strong weather resistance. At present, they have been successfully used in large-diameter drainage and sewage systems, occupying a dominant position in the market. [0003] Large-diameter drainage and sewage pipes are external pressure-bearing pipes, which require the material to have good rigidity to meet the requirements of bearing external forces. At the same time, in order to meet the needs of tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08K13/02C08K5/134C08K5/13C08K5/3492C08K5/526C08K5/524C08K5/098C08K3/22C08K3/04
Inventor 王群涛郭锐王日辉唐岩许平高凌雁苑东兴石晶
Owner CHINA PETROLEUM & CHEM CORP