Flame-retardant heat-conducting nano composite material and preparation method and application thereof

Abstract

The invention discloses a flame-retardant heat-conducting nano composite material and a preparation method and application thereof. Raw materials of the nano composite material include, by mass, 30-70parts of polypropylene resin, 10-40 parts of glass fibers, 5-35 parts of heat conducting powder, 15-45 parts of a flame retardant, 0.5-10 parts of a nano flame retardant thermal conductivity accelerator, 0.5-3 parts of a coupling agent, 5-15 parts of a toughening agent, 0.5-5 parts of a compatibilizer, 0.1-1 parts of an antioxidant and 0.1-1 part of a lubricant. According to the nano composite material, the heat conducting powder, the flame retardant and the nano flame retardant thermal conductivity accelerator are optimized to ensure heat conductivity, flame retardance and mechanical performance of the material when applied in battery outer shells. The compatibilizer and a dispersant are optimized to ensure dispersion of various additives in the resin. The resin with high fluidity is selected so that excellent processing performance is provided, and precise preparation of a complex battery outer shell structure and effective bonding with a battery module can be ensured.

Description

technical field [0001] The invention relates to the technical field of modified composite materials, in particular to a flame-retardant and heat-conducting nano-composite material and its preparation method and application. Background technique [0002] At present, there are battery casings with various base materials on the market, including steel casings, aluminum casings and plastic casings. Among the plastic casings, battery casings based on polypropylene account for a large part. Although the plastic outer casing brings greater convenience to the design and promotion of batteries, the thermal conductivity of plastic itself is poor. The battery will generate a lot of heat during the charging and discharging process, resulting in a relatively complex environment for the entire battery, and there will also be certain potential safety hazards. [0003] At present, there are many reports on the application of flame-retardant polypropylene to battery shell patents, but there...

AI Technical Summary

Problems solved by technology

Although the plastic outer casing brings greater convenience to the design and promotion of batteries, the thermal conductivity of the plastic itself is poor.

The battery will generate a lot of heat during the charging and discharging process, resulting in a relatively complex environment for the entire battery, and there will also be certain safety hazards

[0003] At present, there are many reports on the application of flame-retardant polypropylene to battery shell patents, but there are still defects such as unsatisfactory flame-retardant effect, poor mechanical properties, and failure to take into account the heat dissipation performance of the battery.

[0004] Chinese patent CN102453280 A discloses a power battery shell material based on polypropylene material and its preparation method. The flame retardancy and mechanical properties have been improved, but the thermal conductivity of the battery shell is poor, and the battery is generated during charging and discharging. Heat may cause other hazards