Coextrusion composite polypropylene soft pipe and production method

Abstract

The invention relates to a coextrusion composite polypropylene soft pipe and a production method; the coextrusion composite polypropylene soft pipe comprises a pipe head and a pipe body, the pipe body is a composite structure with 2-5 layers, wherein at least one layer material is the polypropylene or the mixture of the polypropylene and polyethylene, the raw material of the polypropylene adopts 0.5-2.0g / 10min of melt index and is random copolymerization polypropylene catalyzed by metallocene catalyst; the pipe body of the soft pipe is produced by adopting coextrusion process, especially, raw materials of all layers of the pipe body of the soft pipe are added in respective single screw extrusion machine from each hopper, and the materials are melted and are coextruded out from the same molding mixing machine, and then drawing, cooling, vacuum formation, heat treatment, traction, and fixed length cutting are carried out, so as to obtain the pipe body, and mature head injection, printing, post processing, packaging and other procedures are carried out to the pipe body, so as to obtain the composite polypropylene soft pipe finished product. The composite polypropylene soft pipe has high transparency and is harder than the existing product, and the whole weight of the soft pipe is reduced.

Description

technical field [0001] The invention belongs to the field of composite packaging hoses, in particular to a composite polypropylene hose and a production method thereof. Background technique [0002] At present, domestically used co-extruded multi-layer composite hoses for cosmetics and other products are generally made of polyethylene resin (also known as PE) by injection molding or extrusion. Polyethylene resin has excellent molding performance, good flexibility, excellent impact toughness, low temperature resistance, excellent chemical stability, but low heat resistance, poor environmental stress crack resistance, adhesion, adhesion and printability. to O 2 , CO 2 It has good permeability, but poor permeability to water vapor and air. Polypropylene resin (also known as PP) is the plastic with the lightest density except 4-methyl-1-pentene and polyisomorphic crystals. It has excellent resistance to bending fatigue, and its products can be used at room temperature. Bend ...

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Problems solved by technology

[0003] Chinese patent CN 1675298A discloses a plasticized polyolefin composition, although it can provide a propylene polymer with improved toughness without compromising its toughness and other properties, but the addition of plasticizer will undoubtedly increase the cost , and general plasticizers are toxic, and non-toxic plasticizers are expensive, so the safety performance of plasticized polyolefin compositions used in cosmetic packaging and other industries is worthy of concern

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