Thermosensitive color-changing crosslinked polyethylene pipe and preparation method thereof

By adding epoxy soybean oil and nano-titanium dioxide to the polyethylene matrix and combining it with gradient cross-linking technology, the problems of insufficient heat resistance, mechanical properties and explosion resistance of cross-linked polyethylene pipes are solved, and multi-stage reversible color change and high-strength heat-sensitive color change cross-linked polyethylene pipes are achieved.

CN120757901APending Publication Date: 2025-10-10RIFENG ENTERPRISE FOSHAN CO LTD +2
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Patent Information

Application Number
CN202511001714.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-21
Publication Date
2025-10-10

AI Technical Summary

Technical Problem

Existing cross-linked polyethylene pipes have poor heat resistance, insufficient mechanical properties, single functions, are not environmentally friendly, and their explosion resistance needs to be improved.

Method used

By adding epoxy soybean oil as a dispersant and nano-titanium dioxide as an interface modification in the polyethylene matrix, the interfacial tension between the pigment and the polyethylene matrix is ​​reduced. Combined with the gradient cross-linking distribution, the dispersion performance of the pigment in the polyethylene matrix is ​​improved, and the gradient cross-linking technology is used to improve the overall performance of the pipe.

Benefits of technology

It significantly improves the thermal sensitivity and mechanical strength of cross-linked polyethylene pipes, increases the bursting pressure, and achieves multi-stage reversible color change response within the temperature range of 21 to 65°C, extending the color change cycle life and bending fatigue life.

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Abstract

The invention provides a thermosensitive color-changing crosslinked polyethylene pipe and a preparation method thereof. The thermochromic crosslinked polyethylene pipe comprises the following components in parts by weight: 100 parts of polyethylene, 30-50 parts of epoxidized soybean oil, 0.5-2 parts of nano titanium dioxide, 3-8 parts of a compatilizer, 1.5-5 parts of a thermochromic pigment, 0.5-1.2 parts of an antioxidant and 0-3 parts of a functional additive, the cross-linking degree of the thermosensitive color-changing cross-linked polyethylene pipe is reduced from inside to outside in a gradient mode. By adding epoxidized soybean oil as a dispersing agent into a polyethylene matrix and performing interface modification through nano titanium dioxide, under the combined action, the interfacial tension between the pigment and the polyethylene matrix is reduced, the dispersing performance of the pigment in the polyethylene matrix is improved, and the heat sensitivity and mechanical strength of the crosslinked polyethylene pipe are remarkably improved; and gradient cross-linking distribution is further combined, so that the bursting pressure of the cross-linked polyethylene pipe is further improved.
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