Wood-plastic composite coating and preparation method thereof
By combining modified wood powder with plasma treated recycled plastic powder, using water-based coating resin and other components, a wood-plastic composite coating is prepared, which solves the deformation problem of wood-plastic composite materials when temperature changes, and reduces production costs and energy consumption, achieving high hardness, wear resistance and environmentally friendly coating effects.
Patent Information
- Application Number
- CN202510469384.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-15
- Publication Date
- 2025-05-30
AI Technical Summary
When the temperature of the external ambient temperature changes, wood-plastic composite materials are prone to deformation such as expansion, shrinkage, bending, etc., and a large amount of equipment investment and energy loss are required during the production process, resulting in high product prices and reduced competitiveness.
A wood-plastic composite coating is prepared by crushing the wood into powder, modifying it into a porous active material in an alkali solution and/or crosslinking agent solution, and then combining it with the recycled plastic powder after plasma treatment, using components such as aqueous coating resin and propylene oxide p-tolyl ether. The coating may be coated on any shape of metal substrate by spraying, brushing or rolling.
It realizes the high hardness, wear resistance and low price of wood-plastic composite coating coating, while avoiding deformation phenomena such as expansion, shrinkage, and bending, reducing energy consumption and production costs. The coating is safe and environmentally friendly, has no VOC emissions, is resistant to strong acids, strong alkalis, water, corrosion, and does not breed bacteria or fungi.
Abstract
Claims
1. A wood-plastic composite coating, characterized in that: The invention comprises the following components by weight: 13-17 parts of pretreated wood powder, 13-17 parts of pretreated plastic powder, 40-60 parts of deionized water, 130-170 parts of water-based coating resin, 40-60 parts of propylene oxide p-tolyl ether (CGE), 3-7 parts of defoaming agent, 3-7 parts of fly ash, 3-7 parts of iron slag, 3-7 parts of kaolin and 40-60 parts of curing agent.
2. A wood-plastic composite coating according to claim 1, characterized in that: The preparation method of the pretreated wood powder is as follows: 1.1) Crushing the recyclable wood material into micro size (80-200 mesh) to make wood material powder; 1.2) 2.00-10.00 g of NaOH was dissolved in 150.00 g of water to prepare a NaOH solution, 50.00 g of wood material powder was added to the above NaOH solution, stirred at 60° C. for 30 minutes, ultrasonicated for 60 minutes, and then filtered. The above operation was repeated to wash the powder repeatedly until the aqueous solution was neutral, that is, the pH value was between 6.8 and 7.2; 1.3) drying the wood material powder treated with NaOH for later use; 1.4) Take 0.10-5.00g KH560, 1.00-20.00g water, 200.00-400.00g ethanol, and 0.05-5.00g glacial acetic acid. Stir for 1 hour, add 50.00g of the above dried wood material powder, stir for 2 hours, and ultrasonicate for 1 hour; 1.5) Centrifugal filtration to obtain wood powder filter cake; 1.6) After drying, pass through an 80-mesh sieve to produce pretreated wood powder.
3. A wood-plastic composite coating according to claim 2, characterized in that: The recyclable wood material includes any one or more mixtures of wood, bamboo, hemp, cotton, straw, waste paper, and nut shells.
4. A wood-plastic composite coating according to claim 1, characterized in that: The preparation method of the pretreated plastic powder is as follows: 2.1) crushing the recyclable plastic material into micro size (80-200 mesh) to make plastic material powder; 2.2) Plasma treatment of the plastic material powder surface for 20 minutes to enhance the adhesion between the powder and the resin and improve its hydrophilicity to prepare pretreated plastic powder.
5. A wood-plastic composite coating according to claim 4, characterized in that: The recyclable plastic material includes any one or more mixtures of ABS, PC, PP, PE, and PVC.
6. A wood-plastic composite coating according to claim 1, characterized in that: The water-based coating resin includes any one of a water-based alkyd resin, a water-based polyurethane resin, a water-based epoxy resin, a water-based acrylic resin and a water-based polyester resin.
7. The wood-plastic composite coating according to claim 1, characterized in that: The defoaming agent is a silicone defoaming agent.
8. A wood-plastic composite coating according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: 3.1) Add 13-17 parts of pretreated wood powder and 13-17 parts of pretreated plastic powder into a vacuum reactor; 3.2) Add 40-60 parts of deionized water to the above reactor; 3.3) Add 130-170 parts of water-based coating resin, 40-60 parts of propylene oxide p-tolyl ether (CGE), 3-7 parts of defoamer, 3-7 parts of fly ash, 3-7 parts of iron slag, and 3-7 parts of kaolin to the above mixture, and stir at room temperature for 30 minutes; 3.4) Add 40-60 parts of curing agent to the above mixture; 3.5) Turn on the vacuum and stir at room temperature for 30 minutes to obtain the wood-plastic composite coating.