CN202756779U

CN202756779U - Corrosion resistant three-layer co-extrusion plastic pipeline

Info

Publication number: CN202756779U
Application number: CN 201220250493
Authority: CN
Inventors: 田敬华; 刘波
Original assignee: CHANGZHOU RONGSOLAR NEW MATERIAL TECHNOLOGY Co Ltd
Current assignee: CHANGZHOU RONGSOLAR NEW MATERIAL TECHNOLOGY Co Ltd
Priority date: 2012-05-31
Filing date: 2012-05-31
Publication date: 2013-02-27
Anticipated expiration: 2022-05-31

Abstract

The utility model relates to a corrosion resistant three-layer co-extrusion plastic pipeline and solves the problems that traditional plastic pipelines are prone to crack when conveying a corrosive liquid, the strength is reduced, and the like. The technical scheme includes that polyvinylidene fluoride (PVDF), polypropylene (PP) and maleic anhydride grafted polypropylene (PP-g-MAH) raw materials are respectively heated and melted by three extruders at a certain temperature, molten PVDF layer, PP layer and PP-g-MAH layer are simultaneously extruded out through a co-extrusion pipeline mouth mold, the co-extrusion formed pipeline is subjected to cooling setting through a cooling setting mold to form the plastic pipeline with the PP layer serving as an outer layer, the PVDF layer serving as an inner layer and the PP-g-MAH layer serving as a middle layer. The PVDF layer can hinder the corrosive liquid or reduce the damage of the corrosive liquid to the pipeline to a great degree, and the service life of the pipeline can be effectively prolonged.

Description

A kind of anticorrosive three-layer co-extruded plastic pipe

Technical field

The utility model relates to a kind of pipeline, particularly a kind of anticorrosive three-layer co-extruded plastic pipe.

Background technique

Pipeline is extensive in sector applications such as chemical industry, sewage, pharmacy, and it is bearing the function of carrying various liquid, not only requires pipeline to have certain intensity, and the burn into that requirement can anti-various liquid soaks.Common plastic pipe has the materials such as PVC＝polyvinyl chloride (PVC), polypropylene (PP), although cost is lower, corrosion resistance is not enough, and particularly under the long period of soaking of chemical liquid, its intensity descends very fast, and working life is very short.Seeking conveyance conduit anticorrosive, that cost performance is high is the common issue that the industries such as chemical industry face.

Summary of the invention

For overcoming defects, the utility model provides a kind of anticorrosive three-layer co-extruded plastic pipe.

Feature of the present utility model is: utilize three extruders respectively heat fused polypropylene, polyvinylidene fluoride (PVDF) and maleic anhydride inoculated polypropylene (PP-g-MAH), extrude simultaneously PP layer, PVDF layer and PP-g-MAH layer by the co-extrusion pipe mould, forming internal layer is that PVDF layer, skin are the PP layer, and the mesosphere is the three-layer co-extruded plastic pipe of PP-g-MAH.Described polyvinylidene fluoride layer thickness be 0.01mm to 0.05mm, polypropylene layer thickness be 2.0mm to 5.0mm, the maleic anhydride inoculated polypropylene layer thickness is that 0.005mm is to 0.01mm.Wherein, the effect of adhesive layer is played in the mesosphere, and PVDF layer and PP layer are combined closely.

The PVDF resin mainly refers to the copolymer of vinylidene fluoride homopolymer or vinylidene and other a small amount of fluorine-containing vinyl monomers.The great electronegativity energy of fluorine atom adds the unique symplex structure of its molecule so that the fluorine carbon bond that forms is very firm, makes PVDF have excellent weatherability, corrosion resistance and anti-permeability performance.So; after adopting said structure, described PVDF layer has played certain protective action to pipeline, can intercept or reduces to a great extent various chemical liquids to the corrosion failure of pipeline; effectively avoid the problems such as cracking, embrittlement of pipeline, the working life of improving pipeline.

Description of drawings

Fig. 1 is the partial schematic sectional view of a kind of anticorrosive three-layer co-extruded plastic pipe of the utility model.

Among the figure: 1.PP layer 2. PP-g-MAH layer 3.PVDF layer

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described further.

The utility model is a kind of anticorrosive three-layer co-extruded plastic pipe, distinguish at a certain temperature heat fused PP, PVDF and PP-g-MAH raw material by three extruders, then pass through co-extruding tube road junction mould, the PP layer 1, PVDF layer 3 and the PP-g-MAH layer 2 that have melted are extruded simultaneously, by cooling shaping mould the pipeline of this coextrusion mold is carried out cooling and shaping again, the extruder heating-up temperature is 200-240 ^oC, chilling temperature are 15-30 ^oC.Whole production process is strictly controlled heating-up temperature and cooling and shaping temperature, to guarantee can to combine closely between each layer and the dimensional stability of pipeline.

Claims

1. an anticorrosive three-layer co-extruded plastic pipe is characterized in that, internal layer is polyvinylidene fluoride layer, and skin is polypropylene layer, and the mesosphere is the maleic anhydride inoculated polypropylene layer.

2. a kind of anticorrosive three-layer co-extruded plastic pipe as claimed in claim 1 is characterized in that, described polyvinylidene fluoride layer thickness is that 0.01mm is to 0.05mm.

3. a kind of anticorrosive three-layer co-extruded plastic pipe as claimed in claim 1 is characterized in that, described polypropylene layer thickness is that 2.0mm is to 5.0mm.

4. a kind of anticorrosive three-layer co-extruded plastic pipe as claimed in claim 1 is characterized in that, described maleic anhydride inoculated polypropylene layer thickness is that 0.005mm is to 0.01mm.