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Assistant composition, linear medium density polyethylene composition and preparation method thereof, and polyethylene rotational molding product

A composition and polyethylene technology, applied in the field of polyethylene rotomolding products, can solve the problems of limited source of rotomolding raw materials, insufficient strength, yellowing of products, etc., and achieve good anti-ultraviolet light aging resistance, improved fluidity, Stiffness effect

Inactive Publication Date: 2020-04-28
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a new rotomoulding raw material in order to overcome the limited source of existing large-scale storage tank rotomolding raw materials, and adopt this raw material to easily prepare large-scale storage tanks through a rotomolding process
Causes polyethylene rotomolding large-scale products to be difficult to demould during the production process, there are traces of small bubbles on the edge of the product, and the product turns yellow, the strength is not enough, and it is easy to age due to long-term ultraviolet radiation

Method used

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  • Assistant composition, linear medium density polyethylene composition and preparation method thereof, and polyethylene rotational molding product

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Embodiment approach

[0042] According to a preferred embodiment of the present invention, the additive composition contains antioxidant 1076, antioxidant 168, zinc stearate, N, N-dihydroxyethyl octadecylamine, light stabilizer UV944, light Stabilizer UV622, and based on the total amount of the composition, the respective contents are 10-20% by weight, 10-20% by weight, 5-10% by weight, 5-10% by weight, 25-45% by weight and 20% by weight -40% by weight. Adopting the auxiliary agent composition in this preferred mode can further improve the release performance, rigidity-toughness balance and weather resistance of the product.

[0043] The second aspect of the present invention provides a linear medium density polyethylene composition, wherein the linear medium density polyethylene composition comprises: based on the total weight of the linear medium density polyethylene composition, containing 97-99.9 parts by weight of linear Medium-density polyethylene and 0.1-3 parts by weight of the above-menti...

specific Embodiment approach

[0047] According to a specific embodiment of the present invention, the method for preparing the linear polymedium density ethylene composition may comprise the following steps:

[0048] The first step: prepared by the Unipol gas phase process, the melt index is 4.6-5.6g / ml and the density is 0.932-0.938g / cm at 190°C under a load of 2.16kg 3 linear medium density polyethylene powder.

[0049] Second step: the obtained linear medium density polyethylene is blended with the auxiliary agent composition of the present invention, and extruded and granulated to make the linear medium density polyethylene composition.

[0050] Before extrusion granulation, pigments can be added or not according to the needs of downstream customers. Because the phthalocyanine blue pigment is not only bright in color and strong in tinting strength, but also resistant to light and heat, it is more beneficial for large-scale products to be placed outdoors for a long time, so it is preferable to add phth...

Embodiment 1

[0075] (1) Preparation of additive composition

[0076] Based on the total weight of the additive composition, the antioxidant 1076 with a content of 10% by weight, the antioxidant 626 with a content of 20% by weight, the zinc stearate with a content of 6% by weight, and a content of 10% by weight % antistatic agent GMS, UV2020 with a content of 25% by weight, and UV622 with a content of 29% by weight were mixed to obtain an additive composition.

[0077] (2) Preparation of linear medium density polyethylene composition

[0078] (2.1) Prepared by the Unipol gas phase process, the melt index at 190°C under a load of 2.16kg is 5.0g / 10min, and the density is 0.934g / cm 3 Linear medium density polyethylene (powder).

[0079] (2.2) Based on the total weight of the linear medium density polyethylene composition, the linear medium density polyethylene obtained in the step (2.1) of 98 parts by weight and the auxiliary agent composition obtained in the step (1) of 2 parts by weight Car...

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Abstract

The invention relates to the field of plastics, and discloses an auxiliary agent composition, a linear medium density polyethylene composition containing the auxiliary agent composition, a preparationmethod of the linear medium density polyethylene composition and a polyethylene rotational molding storage tank product prepared from the linear medium density polyethylene composition. Based on thetotal weight of the auxiliary agent composition, the auxiliary agent composition comprises the following components in percentage by weight: (1) 5-25% of a main antioxidant; (2) 5-25% of an auxiliaryantioxidant; (3) 3-15% of an external lubricant; (4) 3-15% of an antistatic agent; (5) 20-50% of a light stabilizer A; and (6) 15-45% of a light stabilizer B. According to the invention, the rotational molding processability of polyethylene is improved, the raw material source of a rotational molding product is expanded, the flowability of raw materials is improved, the production efficiency is improved, and the production cost is reduced; and the processed large rotational molding product is white in color, easy to demold, good in inner and outer surface smoothness, uniform in wall thickness,good in toughness, moderate in rigidity and good in ultraviolet resistance and aging resistance, and meets the use requirements.

Description

technical field [0001] The present invention relates to an auxiliary agent composition, a linear medium-density polyethylene composition containing the auxiliary agent composition, a preparation method thereof, and a polyethylene rotomolded product obtained from the linear medium-density polyethylene composition. Background technique [0002] Rotational molding is a very unique processing method. Compared with injection molding and blow molding processes, rotational molding has the outstanding advantages of less investment in equipment and molds, flexible technology, almost no internal stress in the product, not easy to deform, no seams, High strength, suitable for the production of various large and complex hollow plastic products. [0003] The domestic rotomolding industry began in the late 1970s and started relatively late. In recent years, with the maturity of polyethylene powder technology and the continuous improvement of processing equipment, rotomolding technology ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08K5/134C08K5/526C08K5/527C08K5/098C08K5/132C08K5/3492C08K5/3475C08K5/17C08K5/20C08K5/103
CPCC08K5/1345C08K5/526C08K5/527C08K5/098C08K5/132C08K5/3492C08K5/3475C08K5/17C08K5/103C08L2201/08C08L23/0815
Inventor 杨来琴孟鸿诚叶华盛林华杰刘国强向春宇钟士晓黄爱斌柳翼
Owner CHINA PETROLEUM & CHEM CORP
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