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A kind of anti-aging and anti-cold brittle polypropylene-based wood-plastic composite material

A wood-plastic composite material, polypropylene-based technology, used in the field of outdoor buildings and decorative materials, can solve problems such as performance degradation, poor compatibility, and obvious differences in processing fluidity, achieve long service life, improve aging resistance, overcome The effect of easy brittle fracture at low temperature

Active Publication Date: 2015-09-30
ANHUI GUOFENG WOOD PLASTIC COMPOSITE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large difference in the melting points of these reagents and the main components of wood-plastic, the processing fluidity is significantly different, and it is difficult to achieve the best effect by conventional processing methods.
In addition, for plasticizers commonly used in PE wood-plastic materials such as stearic acid, EVA, etc., due to the presence of side methyl groups in the main chain of PP molecules, these plasticizers have poor compatibility with PP, have limited toughening effects, and will cause other performance degradation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] (1) Preparation of composite anti-aging agent

[0021] Take antioxidant 1010, PKY-168, GW-480, UV-531, and POE according to the mass ratio of 3:2:1:0.5:20, add to the internal mixer and blend at 150°C for 20min at a speed of 80rpm.

[0022] (2) Preparation of multi-component copolymerization toughening agent

[0023] Take LDPE, APP, and LMWPE according to the mass ratio of 4:4:2, and then add 0.5% of the total mass of the initiator DCP to mix evenly, and blend in an internal mixer at 160°C for 20min at a speed of 80rpm.

[0024] (3) Preparation of wood-plastic composite materials

Embodiment 1

[0026] 53 parts poplar wood powder, 80 mesh, moisture content 3%;

[0027] 28 parts polypropylene;

[0028] 3 parts maleic anhydride grafted polypropylene;

[0029] 3 parts of composite anti-aging agent;

[0030] 4 parts of multi-component copolymerization toughening agent;

[0031] 6 parts filler, light calcium carbonate;

[0032] 1 part lubricant, zinc stearate;

[0033] Total parts 2% lithopone, 0.2% pcp-Na.

[0034] The above raw materials are firstly mixed into powder by a high-speed mixer, and then made into pellets by a granulator, and extruded into a conical twin-screw extruder with a length-to-diameter ratio of 32;

[0035] After the PP wood-plastic composite material prepared in Example 1 is aged for 480 hours according to GB / T29365-2012, the impact and bending strength retention rates are above 90%. According to GB / T5470-2008, the brittle temperature reaches -3.5°C, which is 8-10°C lower than ordinary PP wood-plastic composite materials, and the unnotched impa...

Embodiment 2

[0037] 50 parts poplar wood, 80 mesh, moisture content 2%;

[0038] 30 parts polypropylene;

[0039] 4 parts maleic anhydride grafted polypropylene;

[0040] 3.5 parts of compound anti-aging agent;

[0041] 4 parts of multi-component copolymerization toughening agent;

[0042] 5 parts filler, talc;

[0043] 1.2 parts lubricant, paraffin;

[0044] Total parts 1% red iron oxide, 0.3% pcp-Na.

[0045] The above raw materials are firstly mixed into powder by a high-speed mixer, and then made into pellets by a granulator, and extruded into a conical twin-screw extruder with a length-to-diameter ratio of 32;

[0046] After the PP wood-plastic composite material prepared in Example 2 is aged for 480 hours according to GB / T29365-2012, the impact and bending strength retention rates are above 95%. According to GB / T5470-2008, the brittle temperature reaches -5°C, which is 9-12°C lower than ordinary PP wood-plastic composite materials, and the unnotched impact strength at room temp...

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Abstract

The invention discloses an ageing and cold-brittleness resistant polypropylene-based wood-plastic composite material. The composite material comprises, by mass, 50-60 parts of wood powder, 25-35 parts of polypropylene, 3-5 parts of maleic anhydride grafted polypropylene, 3-4 parts of a composite anti-ageing agent, 3-6 parts of a compolymerization flexibilizer, 5-8 parts of a filler and 1-2 parts of a lubricant. The composite material overcomes inherent disadvantages of no ageing resistance and low temperature cold brittleness of polypropylene, and the polypropylene-based wood-plastic composite material prepared by adopting the multi-component composite anti-ageing agent and the compolymerization flexibilizer is especially suitable for outdoor buildings and decoration materials having high mechanical performance requirements and large ambient temperature span in environment in which the polypropylene-based wood-plastic composite material cannot be used.

Description

1. Technical field [0001] The invention relates to the field of wood-plastic composite materials, in particular to polypropylene-based wood-plastic composite materials, in particular to a polypropylene-based wood-plastic composite material with aging resistance and anti-cold brittleness, which is suitable for applications with high mechanical performance requirements and environmental temperature differences. Larger outdoor construction, decoration materials. 2. Background technology [0002] Wood plastic composite (WPC for short) is a new type of environmentally friendly material made of various waste plant fibers and recycled plastics. The base materials in commonly used wood-plastic composite formulations mainly include polyethylene (PE), polypropylene (PP) and polyvinyl chloride (PVC). Due to the processing characteristics of polyethylene, nearly 70% of wood-plastic composite materials are polyethylene base composite material. From the perspective of molecular structur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L97/02C08L23/12C08L51/06C08L51/04C08K13/02C08K3/26C08K3/34
Inventor 张亚东方晓钟冯娟郑烨钊钱小洪马岩姚红焱汪群峰张如意李丰奎贾红滢
Owner ANHUI GUOFENG WOOD PLASTIC COMPOSITE