Preparation method of halogen-free flame-retardant low-smoke coated co-extruded wood-plastic profile

Abstract

The invention provides a preparation method of a halogen-free flame-retardant low-smoke coated co-extruded wood-plastic profile, which comprises the following steps of: (1) mixing high-density polyethylene, wood flour, a coupling agent, a lubricant, a plasticizer, expanded graphite and a composite halogen-free flame-retardant smoke suppressant, and granulating the mixture to obtain core layer material particles; (2) mixing sodium-zinc ionized resin, high-density polyethylene, expanded graphite, the composite halogen-free flame-retardant smoke suppressant and a coloring agent, and then granulating the mixture to obtain coating layer material particles; and (3) adding the core layer material particles into a charging barrel of a conical double-screw main extruder, adding the coating layer material particles into a charging barrel of a single-screw auxiliary extruder, simultaneously starting up the extruders for extrusion molding, and carrying out shaping and cooling after extrusion. Thecomposite halogen-free flame-retardant smoke suppressant is prepared from ammonium polyphosphate APP, a triazine charring agent CFA and silicon dioxide. The wood-plastic profile prepared by the preparation method provided by the invention has good flame-retardant and smoke-suppressing effects, does not release toxic and harmful substances at high temperature, and avoids secondary harm to human bodies.

Description

technical field [0001] The invention relates to the technical field of wood-plastic materials, in particular to a method for preparing a halogen-free flame-retardant low-smoke coated co-extruded wood-plastic profile. Background technique [0002] Wood-plastic composite material is a kind of fibrous material made of lignocellulosic materials (such as wood, bamboo, crop straw and processing residues, etc., whose main chemical components are cellulose, hemicellulose and lignin) and plastics (such as polyester New materials composed of thermoplastic polymers such as ethylene, polypropylene, polystyrene, polyvinyl chloride) have been widely used in many fields. However, since both wood fiber materials and plastics are extremely flammable, in practical applications, it is often required that the corresponding wood-plastic composite materials also have certain flame-retardant properties. [0003] At present, the flame-retardant wood-plastic composite materials on the market all ha...

AI Technical Summary

Problems solved by technology

However, according to the fire scene in recent years, the flame retardant performance of most of the current flame retardant wood-plastic composite materials still cannot meet the actual needs, and it is easy to emit a large amount of black smoke and toxic gases when burning, which will cause harm to personnel. Therefore, further improvement is still required

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