Fire-retardant cellulose reinforced plastic composite material and preparation method thereof

A technology of flame-retardant cellulose and composite materials, applied in the field of composite materials, can solve problems such as difficult interlayer defects, poor flame-retardant durability, and smoke release that have not been seen in literature reports, and achieve low smoke release and flame-retardant effects lasting effect

Inactive Publication Date: 2010-11-17
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the preparation method is made by superposition and composite method, it will inevitably cause interlayer defects, and because only the surface is flame-retardant, the overall flame-retardant performance of the material cannot be guaranteed.
[0006] Chinese patent (CN101469082A) uses water-soluble phosphorus-containing flame retardant as the acid source, water-soluble nitrogen-containing flame retardant as the gas source, and then prepares a halogen-free flame-retardant wood with good flame retardancy by combining cellulose materials. Plastic composite materials, but because the flame retardants used ar

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The composite material described in this embodiment consists of 100 parts by weight of polyethylene, 20 parts of flame-retardant modified wood flour, and 20 parts of modified polyethylene. After mixing and melt extrusion, inject into 3 parts (parts by weight, The same below) in the pre-laid polyester filament fiber mold that acts as a reinforcing rib, and then prepared by compression molding. Among them, the material used for flame-retardant modification of wood powder is FR888, the bath ratio of wood powder and modifier solution is 1:3, the reaction temperature is 80°C, and the reaction time is 1.5h; the modifier used in polyethylene is 3 part of azodicarbonamide foaming agent and 5 parts of smoke suppressant ammonium octamolybdate; its preparation process is: the azodicarbonamide and ammonium octamolybdate of said weight part are mixed with 100 parts of polyethylene, and Extrude and granulate with a single-screw extruder to obtain modified polyethylene; the specific s...

Embodiment 2

[0034] In this example, polyethylene has also undergone flame-retardant modification treatment. The specific operation is: after mixing 100 parts by weight of polyethylene, 10 parts by weight of silane-coated ammonium polyphosphate and dipentaerythritol, extrude it with a twin-screw extruder. Pelletizing to obtain flame retardant polyethylene. Wherein, the mass ratio of silane-coated ammonium polyphosphate to dipentaerythritol is 3:1; the rest are the same as in Example 1.

[0035] After testing, the limiting oxygen index of the obtained composite material is 33, the smoke release is not obvious, the tensile strength of the composite material is 53.2MPa, the bending strength is 46MPa, and the impact strength is 18KJ / m 2 .

Embodiment 3

[0037] In this embodiment, polyethylene has also been subjected to flame-retardant modification treatment. The specific operation is: after mixing 100 parts by weight of polyethylene, 10 parts by weight of silane-coated ammonium polyphosphate, dipentaerythritol and zinc oxide, extruder with twin-screw Extrude and granulate to obtain flame-retardant polyethylene. Wherein, the mass ratio of silane-coated ammonium polyphosphate to dipentaerythritol is 3:1; the rest are the same as in Example 1.

[0038] After testing, the limiting oxygen index of the obtained composite material is 34.7, the smoke release is not obvious, the tensile strength of the composite material is 52.1MPa, the bending strength is 45.3MPa, and the impact strength is 16.9KJ / m 2 .

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Abstract

The invention discloses a fire-retardant cellulose reinforced plastic composite material and a preparation method thereof. The composite material is characterized by comprising 100 parts of thermoplastic high polymer and 20 to 50 parts of cellulosic material in part by weight, wherein at least one of the thermoplastic high polymer or the cellulosic material is a material after fire-retardant modification; the thermoplastic high polymer is polyethylene, polypropylene, polyvinyl chloride or polystyrene; and the cellulosic material is one of or a mixture of more than two of the following materials in a mass ratio: wood flour, bamboo powder, wheat straw powder, corn straw powder, bran or rice chaff of which the grain size is 50 to 400 meshes, and cellulose fibers having no textile processing value. The preparation method comprises the following steps of: firstly, performing corresponding fire-retardant modification on the thermoplastic high polymer or/and the cellulosic material; secondly, uniformly mixing the thermoplastic high polymer and the cellulosic material by using a screw extruder; thirdly, extruding the mixture out after fusion; and finally, performing compression molding forming.

Description

technical field [0001] The invention relates to composite material technology, in particular to a flame-retardant cellulose-reinforced plastic composite material and a preparation method thereof. The composite material and the preparation method have the characteristics of flame retardancy, green environmental protection and the like. Background technique [0002] Wood Plastic Composite (WPC) is a new type of material composited with lignocellulosic material as reinforcement and thermoplastic as matrix. It combines the dual advantages of the matrix and the reinforcement, and has the characteristics of good mechanical properties, high impact strength, water resistance, moisture resistance, wear resistance, chemical corrosion resistance, good dimensional stability, etc., and its processing technology can be formed at one time. , You can also use sawing, planing, rotary cutting, grinding and other methods for subsequent processing. Wood-plastic composite materials are in grea...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L27/06C08L25/06C08L97/02C08L67/00C08L81/02C08L1/02C08L23/12C08K3/28C08K9/10C08K9/06C08K3/32C08K5/053C08K3/22C08K7/14C08J9/10C08J5/04
Inventor 任元林程博闻刘晓辉刘玉桂徐玲
Owner TIANJIN POLYTECHNIC UNIV
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