Functional type wood plastic composite (WPC) with light core-shell structure

A technology of wood-plastic composite material and core-shell structure, which is applied in the field of light-weight core-shell structure functional wood-plastic composite material and its preparation, to reduce weight, improve hardness and wear resistance, and increase durability

Active Publication Date: 2011-03-30
南京聚锋新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most commercially produced WPCs use multi-component mixed recycle...

Method used

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  • Functional type wood plastic composite (WPC) with light core-shell structure
  • Functional type wood plastic composite (WPC) with light core-shell structure
  • Functional type wood plastic composite (WPC) with light core-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Adopt HDPE / wood fiber weight ratio to be the mixed material of 70 / 30, add this mixed plastic wood material 10% AC (azodicarbonamide) blowing agent and this mixed plastic wood material 5% DCP (dicumyl peroxide ) as the core material.

[0023] Using HDPE as the matrix, and adding 2% stearic acid modified nano-CaCO by weight of HDPE 3 (Wuhu Weixiang Ultramicro Materials Co., Ltd., model BS6-DI) as the surface material.

[0024] Specific extrusion process: adjust the mold thickness adjustment bolt, so that the thickness of the shell layer material is 3mm; after mixing the shell layer material in the high mixer, extrude it in the side extrusion screw of the twin-screw extruder (HPL27 type) Obtain molten stream; After mixing the core material in a high-speed mixer, extrude in a twin-screw extruder (type 65) to obtain a molten stream, and the two molten streams meet in the confluence chamber of the mould. Under the action of extrusion molding. The mold is a double runner 14...

Embodiment 2

[0031] A mixed plastic wood material with a weight ratio of HDPE / PP of 1:1 is used, and 10% AC (azodicarbonamide) foaming agent and 5% DCP are added to the mixed plastic wood material as the core layer material;

[0032] Using pure HDPE as the matrix, and adding stearic acid modified nano-CaCO with 2% by weight of HDPE 3 As a case material.

[0033] The preparation steps are the same as in Example 1.

[0034] When the shell material is extruded, the extrusion temperature of the side screw is 120-130°C, the speed is 10-15r / min, and the pressure is 4MPa. When the core layer material is extruded, the extrusion temperature of the main screw is 170-190°C. Speed: 19-21r / min, pressure 6MPa; mold temperature 180-200°C.

[0035] The performance test results of the prepared materials are shown in Table 2:

[0036] Table 2

[0037]

[0038] The test method for corrosion resistance is to immerse plastic wood materials in artificially simulated acid rain (H 2 SO 4 Solution) and ar...

Embodiment 3

[0041] HDPE is used as a matrix, 30% of the weight of HDPE wood fiber is added to obtain a mixed plastic-wood material, and 20% of the mixed plastic-wood material is added with an AC (azodicarbonamide) foaming agent as a core layer material.

[0042]Adopt HDPE as matrix, add 20% wood fiber of HDPE weight and 20% talcum powder of HDPE weight as surface shell material.

[0043] The preparation method is the same as in Example 1.

[0044] The performance test results of the prepared materials are shown in Table 3:

[0045] table 3

[0046]

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Abstract

The invention claims a functional type wood plastic composite (WPC) with a light core-shell structure. HDPE (high-density polyethylene) or HDPE/PP (Propene Polymer) blend is taken as a substrate for the WPC. Wood fiber accounting for 0-45% of the substrate by weight is added into the substrate to obtain a mixed plastic wood material; then, a chemical foaming agent accounting for 10-20% of the mixed plastic wood material by weight and a blowing promoter accounting for 0-5% of the mixed plastic wood material by weight are added and taken as a sandwich layer material; wood fibre accounting for 0-20% of the HDPE by weight and stearic acid modified nanometer CaCO3 or talcum powder accounting for 0-30% of the HDPE by weight are added to form a surface shell layer material; the sandwitch layer material and the surface shell layer material obtained in the previous steps are respectively fused to form material flows through different extruders, the material flows converge and are extruded in the converging chamber of a mould to form the functional type WPC with the light nuclear shell structure. The functional type WPC with the light nuclear shell structure has corrosion prevention, antibiosis, good mechanical intensity, rigidity, hardness and wear-resisting property.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a lightweight core-shell structure functional wood-plastic composite material and a preparation process thereof. Background technique [0002] Current applications for wood-plastic composites include decking, railings, railroad side rails, fencing, door and window frames, and houses and other structures. Wood-plastic composites used outdoors have the disadvantages of swelling, twisting, warping, easy to grow mold, decay, fading and easy loss of inserts. The water absorption of the hydrophilic group of the biological components of wood-plastic composites is the main reason for the change of its mechanical properties. Because the absorption of moisture reduces the adhesion between the filler and the polymer matrix, the composite is more susceptible to degradation by weathering and microbial action. Most commercially produced wood-plastic composites use multi-component...

Claims

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Application Information

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IPC IPC(8): B32B27/18C08L23/06C08L23/12C08L97/02C08K9/04C08K3/26C08K3/34
Inventor 吴青林丁建生杨英昌
Owner 南京聚锋新材料有限公司
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