Composite flame-retardant expandable polystyrene particles and preparation technology thereof

Abstract

Disclosed are composite flame-retardant expandable polystyrene particles and a preparation technology thereof. The particles are prepared from the following components of: by weight, 100 parts of styrene monomer, 100-150 parts of water, 1-10 parts of expandable graphite, 1-12 parts of a phosphorus compound, 0.1-0.5 part of white oil, 0.1-0.5 part of polyethylene wax, 0.05-0.2 part of dicumyl peroxide, 0.2-0.8 part of benzoyl peroxide, 0.1-0.4 part of polyvinyl alcohol, 1.1-2.1 parts of tricalcium phosphate and 8-12 parts of pentane. By the addition of a composite fire retardant of expandable graphite and the phosphorus compound before polymerization of styrene, adverse influence of the fire retardant on performance of the product is reduced; expandable graphite and the phosphorus compound are halogen-free fire retardants, the particles have good environmental protection performance; by the addition of white oil, the particles have plasticising and internal lubricant functions as well as good stability and low volatility, and fluidity during the forming of polystyrene particles can be greatly improved; polyvinyl alcohol and tricalcium phosphate are dispersion stabilizers and by timely adding a proper amount of the dispersion stabilizers, the product appearance can be improved, the production efficiency can be raised, and cost can be reduced; and the addition of all the components guarantees the performance of the product.

Description

technical field [0001] The invention relates to a foamable polystyrene particle with flame retardant properties, used for producing construction and packaging materials and a preparation process thereof. Background technique [0002] Expandable polystyrene (EPS) has a low cost and a series of excellent performance, and its output ranks first among the three largest foamed plastics polyurethane (PU), polystyrene (EPS) and polyvinyl chloride (PVC). two. EPS is a very ideal building material. As an external thermal insulation composite wall, it has a very good energy-saving effect, and plays the role of thermal insulation, sound insulation, sealing and blocking water vapor. With the increase of production and consumption year by year, its safety and fire hazard are also increasingly concerned, and it is urgent to improve its flame retardant performance. [0003] Due to the particularity of EPS flame retardant treatment, there are not many types of flame retardants that ca...

AI Technical Summary

Problems solved by technology

[0003] Due to the particularity of EPS flame retardant treatment, there are not many types of flame retardants that can actually be used, mainly halogenated flame retardants, phosphorus flame retardants, inorganic flame retardants and intumescent flame retardants, among which organic bromine Substituted aliphatic hydrocarbons still occupy an absolute advantage, but because their combustion can release toxic and corrosive gases, which will cause serious pollution to the environment, therefore, it is the development trend to find flame retardants and preparation methods suitable for EPS addition, and to improve the flame retardants. The safety and environmental protection performance of combustible EPS is urgently needed by the market

[0004] The patent application number is 99814252.2, and in the patent titled the preparation process of expanded polystyrene particles, the method of using expanded graphite as a flame retardant or using expanded graphite and phosphorus compounds as a flame retardant for polystyrene particles at the same time is disclosed. However, the addition of the flame retardant in this patent is added during or after the polymerization reaction. This method has a great impact on the foamability and stability of polystyrene particles, and the prepared foam products are easy to Shrinkage and collapse, flame retardant falling off, and its poor welding performance is not easy to form, which affects its performance