A roto-moulded article and process for making the same

By constructing an interpenetrating network of modified alumina and modified ammonium polyphosphate in the rotational molding part, and utilizing the migration of silicone oil in a high-humidity environment to form a hydrophobic protective film, the problem of easy loss of flame retardants in high-temperature and high-humidity environments is solved, and long-term flame retardant stability of the rotational molding part is achieved.

CN122404829APending Publication Date: 2026-07-17GUANGZHOU ZHONGDAXIANG MOULD PLASTIC CO LTD
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Patent Information

Application Number
CN202610873201.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-17
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing rotational molding parts, the flame retardant-modified ammonium polyphosphate is prone to react with water molecules in high temperature and high humidity environments, leading to the dissociation and volatilization of ammonium ions and reducing the flame retardant effect.

Method used

Modified alumina and modified ammonium polyphosphate are used to construct interpenetrating organic and inorganic networks through copolymerization. Silicone oil is stored in the modified alumina and migrates to the surface of the modified ammonium polyphosphate in a high-humidity environment to form a hydrophobic protective film, which inhibits the hydrolysis reaction.

Benefits of technology

It improves the flame retardant stability of rotationally molded parts in high temperature and high humidity environments, slows down the loss of modified ammonium polyphosphate, and maintains long-term flame retardant effect.

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Abstract

This invention belongs to the field of preparation technology of polyethylene-containing organic polymer compounds, and particularly relates to a rotational molding part and its preparation process, comprising the following steps: dispersing modified alumina and modified ammonium polyphosphate in anhydrous ethanol, adding EGDMA, VTMS hydrolysate and an initiator, mixing, heating, stirring and reacting, slowly adding TEOS hydrolysate under continuous stirring, filtering, washing, heating and curing, immersing in preheated silicone oil, cooling, filtering, washing and dispersing, and drying to obtain flame-retardant powder; mixing the flame-retardant powder, high-density polyethylene and crosslinking agent, extruding in an extruder, pelletizing, drying, pulverizing, sieving, and then rotationally molding to obtain the rotational molding part. This invention can slow down the loss of modified ammonium polyphosphate in high temperature and high humidity environments and improve the long-term stability of the flame retardancy of the rotational molding part.
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Citation Information

Patent Citations

  • Flame-retardant and antistatic rotational molding polyolefin composition and preparation method thereof

    CN110724325A