Halogen-free flame retardant wood-plastic composite material and preparation method thereof

A technology of wood-plastic composite materials and plastics, which is applied in the field of halogen-free flame-retardant wood-plastic composite materials and its preparation, can solve the problems of large influence on material color, reduced flammability, and small smoke emission, and achieves good mechanical properties and high The effect of flame retardancy

Active Publication Date: 2015-04-08
PRESAFER QINGYUAN PHOSPHOR CHEM
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  • Abstract
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Problems solved by technology

Among them, metal hydroxide has the advantages of good thermal stability, low smoke generation, non-toxicity, and no corrosive gas. However, the filling amount generally exceeds 50% to show a good flame retardant effect, which seriously affects wood. The processing and mechanical properties of plastic composite materials; ammonium polyphosphate is an intumescent flame retardant, which can promote the formation of carbon foam layer when the material is burned, which has the functions of heat insulation, oxygen insulation, smoke suppression, and anti-drip. Adding more than 15% will have a good flame retardant effect, which is not suitable for wood-plastic composite materials with high flame retardant requirements; red phosphorus and expanded graphite have high flame retardant efficiency, and 10%...

Method used

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  • Halogen-free flame retardant wood-plastic composite material and preparation method thereof

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preparation example Construction

[0030] A preparation method of a halogen-free flame-retardant wood-plastic composite material, the steps are as follows:

[0031] a. Pre-drying the natural fibers;

[0032] b. Mix the dried natural fiber and coupling agent evenly and leave it for 3-10 minutes, then fully mix the mixture with flame retardant, plastic, compatibilizer, lubricant and antioxidant;

[0033] c. Extrusion plasticization, pelletizing, injection molding.

Embodiment 1

[0036] Raw materials for the preparation of halogen-free flame-retardant wood-plastic composites (percentage by weight, the same below): poplar wood powder 20%, homopolypropylene 31%, ammonium polyphosphate (model: PreniphorTM EPFR-APP222) 20%, aluminum hypophosphite 10% %, melamine 7%, maleic anhydride grafted polypropylene (graft rate: 0.9~1.1MA%) 6%, tetrakis(3,5-di-tert-butyl-4-hydroxy)pentaerythritol phenylpropionate 0.5%, 1.5% of ethylene bisstearamide, 3% of polyethylene wax, and 1% of vinyl triethoxysilane, according to the preparation method of the present invention, the halogen-free flame-retardant wood-plastic composite material of the present invention is obtained .

[0037] Specifically: first, dry the above-mentioned wood powder in an oven at 105°C for 4 hours, then add vinyltriethoxysilane to the above-mentioned dried wood powder and mix evenly, and then add ammonium polyphosphate and hypophosphorous acid after standing for 5 minutes. Compound flame retardant m...

Embodiment 2

[0039] The raw materials for the preparation of the halogen-free flame-retardant wood-plastic composite material according to the present invention include the following components and weight percentages: elm wood powder 40%, high-density polyethylene (HDPE) 21%, ammonium polyphosphate (model: PreniphorTM EPFR-APP222) 17%, melamine phosphate 5%, aluminum hydroxide 3%, maleic anhydride grafted polyethylene (graft rate: 1.2%) 4%, phosphite antioxidant TNPP 0.5%, ethylene Based on 1.5% of bis stearamide, 3% of polyethylene wax, and 1% of vinyl trimethoxysilane, according to the preparation method of the present invention, the halogen-free flame-retardant wood-plastic composite material of the present invention is obtained.

[0040]Specifically: first, dry the above-mentioned wood powder in an oven at 95°C for 6 hours, then add vinyltrimethoxysilane to the above-mentioned dried wood powder and mix evenly, and then add ammonium polyphosphate and melamine phosphate after standing for...

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Abstract

The invention discloses a halogen-free flame retardant wood-plastic composite material which is prepared from the following raw materials: a natural fiber, plastic, a fire retardant, a compatilizer, an antioxidant, a lubricant and a coupling reagent. The preparation method comprises the following steps: drying the natural fiber in advance; mixing the dried natural fiber with the coupling agent evenly, and placing for 3-10 minutes; fully mixing the mixture with the fire retardant, the plastic, the compatilizer, the lubricant and the antioxidant; and extruding, plastifying, dicing, and carrying out injection molding. The wood-plastic composite material disclosed by the invention does not contain halogen; the composite fire retardant is introduced into a formula system, and works together with other components, so that high flame retardant property can be achieved; specifically, the 1.5mm UL94 V-0 flame retardant level can be achieved; LOI is over 30; and the formula system disclosed by the invention contains the composite fire retardant, but the mechanical property of the composite material is relatively good.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant wood-plastic composite material and a preparation method thereof. Background technique [0002] Wood-plastic composite materials are very environmentally friendly. It mainly adds wood powder, bamboo powder, straw, rice husk and other plant fibers into the resin matrix to form composite materials. The characteristics of this composite material are in line with the rational use of human resources, health and environmental protection. The concept of sustainable development is also in line with our country's call for "building a conservation-oriented society". [0003] At present, the halogen-free flame retardants commonly used in wood-plastic composite materials mainly include metal hydroxides, zinc borate, nano-clay particles, ammonium polyphosphate, red phosphorus, and expanded graphite. Among them, metal hydroxide has the advantages of good thermal stability, low smoke generation, non-toxicity, a...

Claims

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Application Information

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IPC IPC(8): C08L97/02C08L23/06C08L23/12C08K13/02C08K3/32
Inventor 安秉正朱红芳涂伟周侃
Owner PRESAFER QINGYUAN PHOSPHOR CHEM
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