Ultraviolet-resistant photovoltaic PVC pipe and preparation method thereof

By employing a multi-step co-extrusion molding process and chemical bonding technology, the problems of insufficient interlayer bonding and mismatch in thermal expansion coefficients of photovoltaic sheath tubes have been solved, achieving high durability and structural stability of photovoltaic sheath tubes under strong ultraviolet radiation.

CN122100560APending Publication Date: 2026-05-29GUANGDONG CAITONG IND CO LTD
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Patent Information

Application Number
CN202610555880.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-24
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing photovoltaic sheathing pipes, when used outdoors, suffer from insufficient interlayer bonding and a mismatch in thermal expansion coefficients, leading to the formation of interfacial microcracks, which affects structural integrity and protective function.

Method used

A multi-step co-extrusion molding process is adopted, which combines conductive agents, reactive compatibilizers and ultraviolet shielding agents to form chemical bonds and physical networks between inner and outer layers. Combined with high-temperature treatment and gradient cooling process, the problems of insufficient interlayer bonding and mismatch of thermal expansion coefficients are solved.

Benefits of technology

It significantly improves the interlayer bonding strength and dimensional stability, and enhances the durability and structural integrity of photovoltaic sheathing tubes under strong ultraviolet radiation.

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Abstract

The invention discloses a preparation method of an ultraviolet-resistant photovoltaic PVC (polyvinyl chloride) pipe, and relates to the field of preparation of plastic parts, the preparation method specifically comprises the following steps: respectively preparing a dry blend a, a dry blend b, a dry blend c and a dry blend d according to a dry blend base material; wherein the dry blend a comprises a conductive agent, the dry blend c comprises a reactive compatibilizer, and the dry blend d comprises an ultraviolet screening agent; respectively melting the dry mixed material a and the dry mixed material b, performing co-extrusion molding to obtain a base material pipe a with a double-layer structure, and then coating the surface of the base material pipe a with a hot melt adhesive to obtain a base material pipe b; a melt c and a melt d containing mixed liquid are obtained according to the dry mixture c and the dry mixture d respectively, then the surface of the base material pipe b is sequentially coated with the melt c and the melt d in a co-extrusion mode, and a composite pipe blank a is obtained; and sequentially carrying out high-temperature treatment, cooling shaping and post-treatment on the composite pipe blank a to obtain the ultraviolet-resistant photovoltaic PVC pipe. The problems that interlayer binding force is insufficient and thermal expansion coefficients are not matched are solved.
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