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Fire-retardant wood plastic compound material and preparation method thereof

A technology of wood-plastic composite materials and wood powder, which is applied in the field of composite materials, can solve the problems that the compatibility has not been substantially improved, the flame-retardant performance of wood-plastic composite materials cannot pass, and the negative impact on the mechanical properties of materials, etc., to achieve suitable Suitable for industrial production, excellent mechanical properties, good flame retardant performance

Active Publication Date: 2012-05-09
浙江金迪木塑型材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the flame retardants used in wood-plastic composite materials mainly include intumescent flame retardants and nano-organic montmorillonite. The acid source (such as phosphorus-containing flame retardants) in the intumescent flame retardants can promote However, the ideal flame retardant effect can only be achieved when a large amount of cellulose is added, which will have a negative impact on the mechanical properties of the material; while the research on nano-organic montmorillonite (OMMT) in wood-plastic composites is still in the early stage. In the initial stage, the compatibility between montmorillonite and materials has not been substantially improved, and the flame retardancy of OMMT-reinforced wood-plastic composites has not yet passed the LOI and vertical combustion rating tests

Method used

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  • Fire-retardant wood plastic compound material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Soak the wood flour with a particle size of 60 mesh in 1mol / L NaOH aqueous solution, the bath ratio (i.e. the mass ratio of wood flour to NaOH aqueous solution) is 1:15, wash with deionized water until neutral; then use 2.5mol / L Soak in ethanol aqueous solution, the bath ratio (that is, the mass ratio of wood flour to ethanol aqueous solution) is 1:20, then wash with deionized water until neutral; dry at 105° C. for 24 hours to obtain pretreated wood flour.

[0028] Stir the pretreated wood powder in a saturated aqueous solution of melamine with a pH of 5.0 (solution temperature 95°C) for 0.5 hours, and then cool the material rapidly (cooling rate 100°C / min) to 10°C after the stirring is completed, and filter, After drying, heat treatment at 130° C. for 0.5 hour to obtain modified wood flour.

Embodiment 2

[0030] Soak the wood flour with a particle size of 80 mesh in 1mol / L NaOH aqueous solution, the bath ratio (i.e. the mass ratio of wood flour to NaOH aqueous solution) is 1:15, wash with deionized water until neutral; then use 2.5mol / L Soak in ethanol aqueous solution, the bath ratio (that is, the mass ratio of wood flour to ethanol aqueous solution) is 1:20, then wash with deionized water until neutral; dry at 105° C. for 24 hours to obtain pretreated wood flour.

[0031] Stir the pretreated wood powder in a saturated aqueous solution of melamine with a pH of 6.5 (solution temperature 85°C) for 3 hours, and then cool the material rapidly (cooling rate 100°C / min) to 10°C after the stirring is completed, and filter, After drying, heat treatment at 100° C. for 3 hours to obtain modified wood flour.

Embodiment 3

[0033] The modified wood flour that 5Kg embodiment 1 makes, 69Kg high-density polyethylene (HDPE 8001 / Taiwan Plastics), 25Kg magnesium hydroxide, 0.5Kg maleic anhydride grafted polyethylene (GR380 / U.S. Dow) and 0.5Kg Processing aids (ethylene bisstearamide and zinc stearate, the mass ratio of ethylene bisstearamide and zinc stearate is 1:1) together in the SHR-10A high-speed (spindle speed 300r / min) mixer (Zhangjiagang City Light Industry Machinery Factory) pre-mixed for 10 minutes, the pre-mixed temperature is 55 ° C, then added to the conical twin-screw extruder (Wuhan Zeqi Plastic Machinery), melt blended and extruded at 180-195 ° C to produce The pellets were dried, and then hot-pressed at 190 °C and 20 MPa with a hot press (High-speed Railway Testing Instrument Co., Ltd.) to obtain a flame-retardant wood-plastic composite material.

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Abstract

The invention discloses a fire-retardant wood plastic compound material. The compound material comprises the following raw materials in percentage by weight: 5 to 55 percent of modified wood powder, 30 to 70 percent of polymer matrix, 10 to 25 percent of hydrous metallic oxide, 0 to 3 percent of processing aid and 0 to 2 percent of maleic anhydride grafted polyethylene. The invention also discloses a method for preparing the fire-retardant wood plastic compound material. The method comprises the following steps of: pretreating the wood powder by alkali solution and alcoholic solution to remove unstable materials such as hemicellulose and micro molecular esters from the wood powder; treating the surface of the wood powder by using melamine saturated hot water solution to obtain the modified wood powder; and performing melting combination of the modified wood powder, hydrous metallic oxides and polymer matrix to obtain the fire-retardant wood plastic compound material. The fire-retardant wood plastic compound material of the invention has the advantages of excellent mechanical property, high fire-retardant property, simple preparation method and the suitability for industrialized production.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a flame-retardant wood-plastic composite material and a preparation method thereof. Background technique [0002] A key drawback of wood-plastic composites is flammability, which is mainly attributed to the fact that wood fibers and polyolefin materials, the raw materials used to prepare wood-plastic composites for outdoor applications, are flammable and generate a lot of smoke when burned. In order to improve the fire safety quality of wood-plastic composite materials and broaden the application of its outdoor building decoration materials, it is necessary to add flame retardants or non-combustible substances inside. Some intumescent flame retardants and phosphate ester flame retardants have begun to be researched and applied in wood-plastic composite materials. For example, a Chinese patent application with publication number CN 101469082A discloses a halogen-free flame-retar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L23/12C08L97/02C08L51/06C08K3/22
Inventor 王永虎
Owner 浙江金迪木塑型材有限公司