Halogen-free flame-retardant polystyrene foam composite material and preparation method thereof

Abstract

The invention discloses a halogen-free flame-retardant polystyrene foam composite material which is prepared through the following steps: evenly mixing 100 parts of foam particles prepared by a conventional technology with a binder which consists of 10-80 parts of an aerogel matrix, 0-10 parts of an aerogel crosslinking agent, 10-50 parts of nano clay and 10-40 parts of a halogen-free flame retardant so as to obtain a mixture, performing compression-molding refrigeration and drying the mixture, wherein the weight ratio of the foam particles to the aerogel matrix binder in the foam composite material is 1:(0.3-1.8), the density is 21-44kg / m<3>, the vertical burning grade is UL-94V-0, the limit oxygen index is 26-45% and the heat conductivity is 0.031-0.035W / mK. Since the aerogel is low in density and heat conductivity, excellent in binding performance, and capable of jointly acting with nano clay and halogen-free flame retardant to provide outstanding flame retarding performance and charring performance, the foam composite material can keep low density and good heat preserving performance and the flame retarding performance of the composite material is greatly enhanced; besides, the technology is mature, simple to operate, easy to control and beneficial to popularization and application.

Description

technical field [0001] The invention belongs to the technical field of polystyrene foam and its preparation, and in particular relates to a halogen-free flame-retardant polystyrene foam composite material and a preparation method thereof. Background technique [0002] The polymer foam material has excellent comprehensive properties, and has the advantages of light weight, high specific strength, chemical corrosion resistance, thermal insulation, sound absorption and noise reduction, shock absorption, softness, insulation, easy processing and high cost performance. At present, the most important polymer foam materials are expandable polystyrene foam (EPS), extruded polystyrene foam (XPS), polyurethane foam (PU) and polyvinyl chloride foam (PVC). In my country, expandable polystyrene foam is the most used type of foam, and its total production and consumption both rank first in the world. In 2011, the total domestic EPS production has exceeded 4.75 million tons, accounting for...

AI Technical Summary

Problems solved by technology

Another example is CN102675762A, which reports a EPS foam that uses halogen-free flame-retardant glue and expandable graphite to synergistically flame-retardant. Although the foam has a high limiting oxygen index, it can also pass the UL-94V-0 grade, but the added flame-retardant Burning the coating layer will greatly increase its thermal conductivity (0.037-0.043W / mK, which is greatly improved compared with 0.030-0.032W / mK of pure EPS foam), thus affecting its thermal insulation performance.

In general, since the density of EPS particles is very small, and the density of the filled binder and flame retardant is relatively large, if the amount of addition is small, it will result in a small volume ratio in the foam and low flame retardant efficiency; More flame retardant coating components will lead to higher density and higher thermal conductivity of flame retardant foam