Preparation And Performance Evaluation Of Environmentally Friendly Wood-plastic Composite Materials
Preparation of wood-plastic composite materials
(1) Wood powder drying: Place poplar wood powder in a constant temperature drying oven, set the temperature to 105°C, dry for 8 hours and then take it out.
(2) Wood powder modification: Mix the above-mentioned dried wood powder with absolute ethanol and silane coupling agent in a certain proportion, and use a high-speed mixer to stir and react for 3 hours at 50°C.
(3) High-speed mixing reaction: Mix the above-mentioned modified wood powder, PVC, bamboo charcoal powder, chitosan, composite stabilizer FWJ-1 and acetic anhydride according to a certain proportion.Place into a high-speed mixer and stir for 20 minutes at 80°C.
(4) Masting and extrusion: Place the mixture after the above-mentioned high-speed mixing reaction in a double-roller masticator and mix at 150°C for 20 minutes.Then use a hot press to hot press at 180°C and 5 MPa for 8 minutes, and then cold press for 10 minutes (7 MPa) to prepare environmentally friendly wood-plastic composite products.
Performance evaluation
Mechanical properties
Refer to the national standard GB/T 1040-2006 "Determination of tensile properties of plastics",The relevant provisions in GB/T 9341-2008 "Determination of Bending Properties of Plastics" and GB/T 1043.1-2008 "Determination of Impact Properties of Plastic Simply Supported Beams",The tensile strength, flexural strength, flexural modulus and impact strength of environmentally friendly wood-plastic composite materials are measured to evaluate the mechanical properties of environmentally friendly wood-plastic composite materials.
Thermal properties
The thermogravimetric curves of environmentally friendly wood-plastic composites were measured using a TGA1350 thermogravimetric analyzer to evaluate their thermal properties.
water absorption properties
Referring to the relevant provisions in the national standard GB/T 17657-2013 "Test Methods for Physical and Chemical Properties of Artificial Panels and Veneer Artificial Panels", the water absorption performance of environmentally friendly wood-plastic composite materials was measured with the water absorption rate as an evaluation index.
Durability
The XHR-150 hardness tester was used to measure the hardness changes of environmentally friendly wood-plastic composite materials after being placed for different times under simulated natural conditions (temperature: 28°C, humidity: 80%) to evaluate its durability.
