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Polyethylene composition for rotational moulding and preparation method of polyethylene composition

A technology of polyethylene and composition, applied in the field of polyethylene composition for rotational molding, can solve the problems of poor use effect, reduced material toughness, environmental stress cracking resistance, etc., and achieves improved environmental stress cracking resistance, excellent Comprehensive performance, the effect of improving mechanical properties

Active Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these modification methods improve the rigidity of the material to a certain extent, they reduce the toughness and environmental stress cracking resistance of the material, and the actual use effect is not very good.

Method used

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  • Polyethylene composition for rotational moulding and preparation method of polyethylene composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add CNF (average diameter 190nm, length distribution range 1-60μm) and aminopropyltriethoxysilane coupling agent KH550 into a high-speed mixer successively, and mix at 80°C for 8 minutes to modify the surface of CNF, wherein The amount of surface modifier used is 0.5% by weight of CNF. 100 parts of LLDPE with a melt flow rate of about 5g / 10min, 0.2 parts of surface-modified CNF, antioxidant tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] 0.05 part of pentaerythritol ester, 0.1 part of antioxidant tris(2,4-di-tert-butylphenyl) phosphite, light stabilizer poly-{[6-[(1,1,3,3-tetramethylbutyl Base)-imino]-1,3,5-triazine-2,4-diyl][2-(2,2,6,6-tetramethylpiperidinyl)-amino]-hexylene-[ Add 0.3 part of 4-(2,2,6,6-tetramethylpiperidinyl)-imino]} into the high-speed mixer, mix for 5 minutes, and Extruded and granulated by a screw extruder to obtain a polyethylene composition for rotomolding, the mechanical properties of which are shown in Table 1.

Embodiment 2

[0026]Add CNF (average diameter of 200nm, length distribution range of 1-60μm) and bis(dioctyloxypyrophosphate)ethylene titanate coupling agent NDZ-311 into the high-speed mixer successively, and mix at 80°C for 9 Minutes, the surface modification of CNF was carried out, wherein the amount of surface modifier was 1% of the weight of CNF. 100 parts of LLDPE with a melt flow rate of about 5g / 10min, 0.5 parts of surface-modified CNF, antioxidant tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] 0.05 part of pentaerythritol ester, antioxidant 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-s-triazine-2,4,6-(1H,3H,5H)trione 0.1 part, 0.2 part of antioxidant bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, 0.3 part of light stabilizer 2-hydroxy-4-n-octyloxybenzophenone, light stabilizer Add 0.2 parts of the polymer of succinic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinol into a high-speed mixer, mix for 5 minutes, and then process at a normal processing t...

Embodiment 3

[0028] Add CNF (average diameter 210nm, length distribution range 1-60μm) and distearoyloxyisopropoxyaluminate coupling agent SG-Al821 into the high-speed mixer successively, mix at 80°C for 10 minutes, and CNF Surface modification is carried out, wherein the amount of surface modifier is 3% by weight of CNF. 100 parts of LLDPE with a melt flow rate of about 5g / 10min, 0.8 parts of surface-modified CNF, antioxidant 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-di Methylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)trione 0.7 parts, light stabilizer 2-hydroxy-4-n-octyloxybenzophenone Add 0.5 parts and 0.4 parts of 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole into a high-speed mixer, mix for 5 minutes, and then process at a normal processing temperature of 180-240°C The twin-screw extruder extruded and granulated to obtain a polyethylene composition for rotomolding, and its mechanical properties are shown in Table 1.

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Abstract

The invention relates to a polyethylene composition for rotational moulding and a preparation method of the polyethylene composition. The polyethylene composition has excellent combination property and can simultaneously improve rigidity, toughness and environment stress cracking resistance of a material. The polyethylene composition comprises the following components in parts by weight: 100 parts of linear low density polyethylene, 0.1-1 part of surface modification nano carbon fiber, 0.05-1 part of antioxygen and 0.1-1 part of light stabilizer. The preparation method of the polyethylene composition is as follows: firstly, carrying out surface modification on nano carbon fiber with a surface modifier; and then carrying out fusing granulation on low density polyethylene resin, the surfacemodification nano carbon fiber, the light stabilizer and the antioxygen with a double-screw extruder, so as to obtain the polyethylene composition for the rotational moulding. In the polyethylene composition for the rotational moulding provided by the invention, the stretching strength, bending strength, impact property and environment stress cracking resistance are improved at different degrees,thereby achieving the effect of simultaneously increasing rigidity and toughness, and realizing excellent combination properties for the material.

Description

technical field [0001] The invention relates to a polyethylene composition for rotational molding, which belongs to the technical field of polymer materials. Background technique [0002] Rotational molding, also known as rotary molding, is formed by adding materials directly into the mold to heat, while rotating the mold, so that the material is evenly coated in the mold while melting, and the product is obtained after cooling and demoulding. Compared with injection molding, blow molding and other processes, its outstanding advantages lie in less investment in equipment and molds, and it is suitable for the production of medium and large plastic products with complex shapes. The products have almost no internal stress and are not easy to deform. Due to the superiority of this process, rotational molding has developed rapidly in China in recent years. [0003] Generally, rotomolded products have high requirements on the impact resistance and environmental stress crack resis...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K13/06C08K9/06C08K9/04C08K7/06B29C41/04
Inventor 陈枫何鹏
Owner CHINA PETROLEUM & CHEM CORP
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