Polyethylene/ polypropylene/ polypropylene three-layer co-extrusion upward bowing film and preparation method thereof

A three-layer co-extrusion and polyethylene technology, which is applied in chemical instruments and methods, lamination, layered products, etc., can solve problems such as difficulty in maintaining transparency and low PP melt strength

Inactive Publication Date: 2015-12-16
公主岭华美塑料制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In order to solve the problems of low melt strength of existing PP and difficulty in maintaining transparency after blending and toughening, the present invention provides a polyethylene / polypropylene / polyethylene three-layer co-extruded blown film and its preparation method

Method used

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  • Polyethylene/ polypropylene/ polypropylene three-layer co-extrusion upward bowing film and preparation method thereof

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preparation example Construction

[0033] The present invention also provides a preparation method of a polyethylene / polypropylene / polyethylene three-layer co-extrusion blown film, comprising:

[0034] The propylene random copolymer is added to the middle layer extruder hopper of the three-layer co-extrusion blown film machine, and then the inner layer ethylene blend and the outer layer ethylene blend are respectively added to the three-layer co-extrusion blown film machine In the hopper of the extruder for the inner and outer layers, the upper blowing method is used to blow the film into a film to obtain a polyethylene / polypropylene / polyethylene three-layer co-extruded upper blown film.

[0035] The set temperature of the three-layer co-extrusion film blowing machine is preferably: outer zone 1: 180-210°C, outer zone 2: 180-210°C, outer zone 3: 185-215°C, outer zone 4: 190- 220°C, outer five zones: 190-220°C; middle one zone: 180-210°C, middle two zone: 180-210°C, middle three zone: 185-215°C, middle four zone...

Embodiment 1

[0038] The invention provides a high-strength heat-shrinkable polyethylene / polypropylene / polyethylene three-layer co-extruded blown film, the composition and mass ratio of the formula are as follows:

[0039] 30 parts of special resin for outer layer PE blown film (7042:1018:100Ac=4:3:3);

[0040] Middle layer K8303 (PP:PE=7:3) 40 parts;

[0041] 30 parts of special resin for inner layer PE blown film (7042:1018:100Ac=3:3:4).

[0042] In the hoppers of the three extruders, the outer layer, the middle layer, and the inner layer, add the outer layer PE blown film special resin, the middle layer K8303, and the inner layer PE blown film special resin according to the above ratio, and use the upper blowing method to blown into a film to obtain polyethylene / polypropylene / Polyethylene three-layer co-extrusion blown film. The set temperature of the film blowing machine for three-layer co-extruded PE / PP / PE blown film is outer zone 1: 180-210℃, outer zone 2: 180-210℃, outer zone 3: 1...

Embodiment 2

[0045] The invention provides a high-strength heat-shrinkable polyethylene / polypropylene / polyethylene three-layer co-extruded blown film, the composition and mass ratio of the formula are as follows:

[0046] 25 parts of special resin for outer layer PE blown film (7042:1018:100Ac=4:3:3);

[0047] Middle layer K8303 (PP:PE=7:3) 50 parts;

[0048] 25 parts special resin for inner layer PE blown film (7042:1018:100Ac=3:3:4).

[0049] In the hoppers of the three extruders, the outer layer, the middle layer, and the inner layer, add the outer layer PE blown film special resin, the middle layer K8303, and the inner layer PE blown film special resin according to the above ratio, and use the upper blowing method to blown into a film to obtain polyethylene / polypropylene / Polyethylene three-layer co-extrusion blown film. The set temperature of the film blowing machine for three-layer co-extruded PE / PP / PE blown film is outer zone 1: 180-210℃, outer zone 2: 180-210℃, outer zone 3: 185-...

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Abstract

The invention provides a polyethylene/ polypropylene/ polypropylene three-layer co-extrusion upward bowing film and a preparation method thereof and belongs to the technical field of high molecular materials. The polyethylene/ polypropylene/ polypropylene three-layer co-extrusion upward bowing film and the preparation method solve the problems that existing PP melt is low in intensity, and it is difficult to keep transparency after blending and toughening are conducted. The inner layer and the outer layer of the upward blowing film are ethylene blender, and the middle layer is propylene random copolymer. The invention further provides the preparation method of the polyethylene/ polypropylene/ polypropylene three-layer co-extrusion upward bowing film. The propylene random copolymer is selected to serve as the middle layer of the upward blowing film, the tensile elongation yield and the tearing strength of the PP film can be effectively improved, proper models of PE and PP are blended to serve as the inner layer and the outer layer, the compatibility of the middle layer of the PP film and the PE of the inner layer and the outer layer can be increased, the binding force among layers is improved, the stripping phenomenon among layers is avoided, the transparency of PP can be kept, and the hot-shrinkage rate of multiple layers of films is raised.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and in particular relates to a polyethylene / polypropylene / polyethylene three-layer co-extruded blown film and a preparation method thereof. Background technique [0002] PP has low density, good mechanical properties, high temperature resistance, and excellent chemical stability. It is suitable for extrusion, injection molding, blow molding, and spinning, but it has defects in melt strength. It does not have the characteristic of strain hardening. Therefore, the application of PP in these fields has been limited. The solution is to develop high melt strength PP and improve the performance of PP, thereby expanding the application field of PP. [0003] Generally, PP resin is rarely processed on traditional blow molding equipment designed for PE due to its low melt strength, long cooling time, and poor transparency. PP blown film technology generally adopts the down blowing water cooling p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/32B32B37/15
CPCB32B27/08B32B27/32B32B37/153B32B2250/03B32B2250/242B32B2307/412B32B2307/54B32B2307/582B32B2307/7246B32B2439/70
Inventor 杜凤文张会良
Owner 公主岭华美塑料制品有限公司
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