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Methods for gel reduction in polyolefins

A technology of polyolefin and polyolefin film, which is applied in the field of gel reduction, and can solve the problems of reducing film and film unsalable

Active Publication Date: 2017-08-29
UNIVATION TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The presence of gels can reduce the value of these membranes and in some cases, make the membranes unmarketable

Method used

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  • Methods for gel reduction in polyolefins
  • Methods for gel reduction in polyolefins
  • Methods for gel reduction in polyolefins

Examples

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example

[0117] Coperion ZSK-70mm co-rotating twin-screw extruder with Gear Pump ZP-90, Screen Pack Changer SWZ-300 and Granulator Unit UG-122 for comparison Tested to assess the effect of SEI on gel reduction. The ZSK extrusion press consists of five individually temperature-controlled barrels. The first barrel in the arrangement was used as the feed barrel to which no heat was applied. The screw design uses a first mixing and melting section, followed by a distribution section and finally a melt homogenization section. The resulting pellet was used to make a membrane and the gel count of the membrane was determined.

[0118] The resulting polyethylene pellets were extruded into films without any additives. Polyethylene pellets were produced in a commercial scale gas phase UNIPOL reactor system with a mass of 0.9135 to 0.9185 g / cm 3 Density, I of 0.30 to 0.60dg / min 2 value and an I of 25 to 35 21 / I 2 metallocene resins.

[0119] The amount of gel in the resulting film was det...

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Abstract

The present invention provides methods for extrusion of polyolefins (112) that control specific energy input to the extruder (102) for gel reduction. Disclosed herein is an example method for forming plastic products (120, 208) with reduced gels, comprising: melting a polyolefin resin (112) in extruder (102) to form a melt; adjusting specific energy input in the extruder (102) to reduce gels in the melt; and forming the melt into a polyolefin product (120, 208). Disclosed herein is also an example method for forming plastic products (120, 20) with reduced gels, comprising: melting a polyolefin resin in extruder (102) to form a melt; selecting a throttle valve (104) position for gel reduction; setting the throttle valve (104) at the selected throttle valve (104) position to restrict flow of the melt out of the extruder (102); and forming the melt into a polyolefin product (120, 208).

Description

technical field [0001] The present invention generally relates to gel reduction in polyolefins. More specifically, the present invention relates to a method of extruding polyolefins by controlling the specific energy input to an extruder so that gel is reduced. Background technique [0002] Films extruded from high density polyolefins, especially high density polyethylene, are becoming important products worldwide. Even more precisely, the use of multimodal or bimodal polyethylene in films has an increased market share compared to traditional unimodal polyethylene. In order to produce such membranes, complex reaction methods such as using multi-site catalysts and / or multi-stage reactors are necessary. This can often create membrane quality issues, such as the presence of gels. Gel is a highly localized defect in the membrane that is visually distinct from the surrounding membrane. Gels typically exist for several different reasons, including unincorporated polymer, unrea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/00B29C47/08B29C47/36B29C47/68B29C47/92B29C48/92
CPCB29C48/92B29C48/08B29C48/10B29C48/268B29C48/04B29C48/69B29C48/37B29C2948/92047B29C48/705B29C2948/92876B29C2948/92219B29C2948/92714B29C2948/92695B29C2948/92542B29C48/2552Y02P70/10B29B9/065B29B7/428B29B7/488B29K2023/00C08L23/06
Inventor D·A·阿部B·C·洛克利尔Y·M·朱T·R·卫瑞尔
Owner UNIVATION TECH LLC
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