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CN-121975245-A - Mildew-proof wood-plastic composite decorative board and preparation method thereof

CN121975245ACN 121975245 ACN121975245 ACN 121975245ACN-121975245-A

Abstract

The invention discloses a mildew-proof wood-plastic composite decorative plate and a preparation method thereof, wherein the decorative plate comprises the following raw material components, by weight, 40-100 parts of modified wood fiber powder, 6-30 parts of calcium carbonate, 90-100 parts of thermoplastic plastic matrix, 2-5 parts of lubricant, 1-6 parts of coupling agent and 2-15 parts of auxiliary agent, the preparation method of the modified wood fiber powder comprises the following steps of A1, soaking the wood fiber powder in an organic acid solution, leaching for multiple times, centrifugally collecting residues, washing to neutrality, drying to obtain pretreated wood fiber powder, A2, soaking the pretreated wood fiber powder in an inorganic ferric salt solution, carrying out suction filtration to obtain a filter cake, A3, soaking the filter cake in an ethanol solution of a hydroxypyridine derivative to obtain modified wood fiber powder, and A4, washing and drying the modified wood fiber powder. By the formula, the wood-plastic composite decorative board with high mildew resistance and long-term use can be prepared.

Inventors

  • JIANG QIMING
  • CHEN XIANWEI
  • XIE WEI
  • WANG GANGGANG
  • CHEN YULING

Assignees

  • 佛山石湾鹰牌陶瓷有限公司

Dates

Publication Date
20260505
Application Date
20260115

Claims (9)

  1. 1. The mildew-proof wood-plastic composite decorative board is characterized by comprising the following raw material components, by weight, 40-100 parts of modified wood fiber powder, 6-30 parts of calcium carbonate, 90-100 parts of thermoplastic plastic matrix, 2-5 parts of lubricant, 1-6 parts of coupling agent and 2-15 parts of auxiliary agent; the preparation method of the modified wood fiber powder comprises the following steps: A1, soaking wood fiber powder in an organic acid solution, leaching for multiple times under ultrasonic conditions, centrifuging to collect residues, washing with clear water to be neutral, and finally drying to obtain pretreated wood fiber powder; A2, soaking the pretreated wood fiber powder in an inorganic ferric salt solution, and carrying out suction filtration to obtain a filter cake; A3, soaking the filter cake in ethanol solution of the hydroxypyridine derivative to obtain modified wood fiber powder; and A4, washing and drying the modified wood fiber powder.
  2. 2. The mildew-resistant wood-plastic composite decorative sheet according to claim 1, wherein the organic acid solution comprises, by weight, 1.8 to 2.2 parts of an organic acid, 0.05 to 0.07 part of a surfactant, 0.01 to 0.02 part of anhydrous ethanol, and 30 to 50 parts of water.
  3. 3. A mildew resistant wood plastic composite decorative sheet according to claim 2, wherein the organic acid is glutamic acid and the surfactant is sodium dodecyl isethionate.
  4. 4. A mildew-proof wood-plastic composite decorative board according to claim 3, wherein in step A1, wood fiber powder is soaked in organic acid solution, and leaching is carried out for 3-5 times under ultrasonic condition with power of 300-400W, wherein the leaching temperature is 35-45 ℃, and the leaching time is 20 per time Collecting residue by centrifuge after 40min, washing residue with clear water to neutrality, and drying; the weight part ratio of the wood fiber powder to the organic acid solution is 1 (3-5).
  5. 5. The mildew-proof wood-plastic composite decorative board according to claim 4, wherein in the step A2, the pretreated wood fiber powder in the step A1 is soaked in an inorganic ferric salt solution for 1-2.5 hours, the stirring speed is 50-80rpm, and then a filter cake is obtained by suction filtration; the inorganic ferric salt solution is ferric chloride water solution with the molar concentration of 0.20-0.25 mol/L; The weight part ratio of the pretreated wood fiber powder to the inorganic ferric salt solution is 1 (10-20).
  6. 6. The mildew-proof wood-plastic composite decorative board according to claim 5, wherein in the step A3, the filter cake is soaked in ethanol solution of hydroxypyridine derivatives for 3.5-4h to obtain modified wood fiber powder; the hydroxypyridine derivative is 3-hydroxy-2-picolinic acid, and the molar concentration of ethanol solution of the hydroxypyridine derivative is 0.4-0.6mol/L; the weight part ratio of the filter cake to the ethanol solution of the hydroxypyridine derivative is 1 (8-9).
  7. 7. A mildew resistant wood plastic composite decorative sheet according to claim 6, wherein said thermoplastic matrix is selected from one of PP, PE and PS.
  8. 8. The mildew-resistant wood-plastic composite decorative sheet according to claim 1, wherein the lubricant is one of paraffin wax, PE wax and stearic acid, and the coupling agent is a silane coupling agent or maleic anhydride grafted polyethylene.
  9. 9. A method for preparing a mildew-proof wood-plastic composite decorative board, which is used for preparing the mildew-proof wood-plastic composite decorative board according to any one of claims 1 to 8, and is characterized by comprising the following steps of; step A, preparing modified wood fiber powder; Step B, mixing the modified wood fiber powder, calcium carbonate, a thermoplastic plastic matrix, a lubricant, a coupling agent and an auxiliary agent, and adding the mixture into a high-speed mixer for premixing to obtain a premix; And C, putting the premix into a double-screw extruder, extruding and granulating at 160-200 ℃ and 80-160rpm, and then putting the granules into an injection molding machine for injection molding at 170-200 ℃ to obtain the wood-plastic composite decorative plate.

Description

Mildew-proof wood-plastic composite decorative board and preparation method thereof Technical Field The invention relates to the technical field of wood-plastic composite decorative plates, in particular to a mildew-proof wood-plastic composite decorative plate and a preparation method thereof. Background The wood-plastic composite material is a green energy-saving environment-friendly material compounded by taking natural wood fibers and a thermoplastic plastic matrix as main components and other processing aids as auxiliary materials. Wherein the natural wood fiber can be obtained from wood, bamboo, crop straw, leftover materials, waste materials, etc. However, natural wood fibers contain natural nutrients such as starch, hemicellulose, and sugar, and even if they are simply dried, trace amounts of the components which are liable to mildew remain. Mold spores in the air can be attached to the surface of the plate, residual nutrients in wood fibers are used as carbon sources and energy sources, spore germination, hypha spreading and spore reproduction are completed rapidly, and finally black and green mildew spots appear on the surface of the plate. In addition, the oxidation aging of wood fiber can be unavoidable in the long-term use process of the wood-plastic composite decorative board. The cellulose and lignin skeletons of the lignocellulose can be broken by chain segments under the oxidation action, so that residual moldy components originally wrapped in the fibers can be released, and low-molecular-weight esters, carboxylic acids and polysaccharide micromolecular substances can be newly generated. The oxidation products can be used as an additional nutrient source for mould growth, a composite nutrient system of inherent nutrients and oxidized new nutrients is formed, the propagation rate of mould is greatly accelerated, and the overall performance of the wood-plastic composite decorative board is further affected. Disclosure of Invention Aiming at the defects, the invention provides a mildew-proof wood-plastic composite decorative board which can be prepared into a wood-plastic composite decorative board with high mildew resistance and strong antibacterial effect and can be used for a long time. To achieve the purpose, the invention adopts the following technical scheme: the mildew-proof wood-plastic composite decorative board comprises the following raw material components, by weight, 40-100 parts of modified wood fiber powder, 6-30 parts of calcium carbonate, 90-100 parts of thermoplastic plastic matrix, 2-5 parts of lubricant, 1-6 parts of coupling agent and 2-15 parts of auxiliary agent; the preparation method of the modified wood fiber powder comprises the following steps: A1, soaking wood fiber powder in an organic acid solution, leaching for multiple times under ultrasonic conditions, centrifuging to collect residues, washing with clear water to be neutral, and finally drying to obtain pretreated wood fiber powder; A2, soaking the pretreated wood fiber powder in an inorganic ferric salt solution, and carrying out suction filtration to obtain a filter cake; A3, soaking the filter cake in ethanol solution of the hydroxypyridine derivative to obtain modified wood fiber powder; and A4, washing and drying the modified wood fiber powder. Further, the organic acid solution comprises, by weight, 1.8-2.2 parts of an organic acid, 0.05-0.07 part of a surfactant, 0.01-0.02 part of absolute ethyl alcohol and 30-50 parts of water. Further, the organic acid is glutamic acid, and the surfactant is sodium dodecyl isethionate. Further, in the step A1, the wood fiber powder is soaked in an organic acid solution, and is leached for 3 to 5 times under the ultrasonic condition with the power of 300 to 400W, the leaching temperature is 35 to 45 ℃, and the leaching time is 20 per timeCollecting residue by centrifuge after 40min, washing residue with clear water to neutrality, and drying; the weight part ratio of the wood fiber powder to the organic acid solution is 1 (3-5). Further, in the step A2, the pretreated wood fiber powder in the step A1 is soaked in an inorganic ferric salt solution for 1-2.5 hours, the stirring speed is 50-80rpm, and then a filter cake is obtained through suction filtration; the inorganic ferric salt solution is ferric chloride water solution with the molar concentration of 0.20-0.25 mol/L; The weight part ratio of the pretreated wood fiber powder to the inorganic ferric salt solution is 1 (10-20). Further, in the step A3, the filter cake is soaked in ethanol solution of the hydroxypyridine derivative for 3.5-4 hours to obtain modified wood fiber powder; the hydroxypyridine derivative is 3-hydroxy-2-picolinic acid, and the molar concentration of ethanol solution of the hydroxypyridine derivative is 0.4-0.6mol/L; the weight part ratio of the filter cake to the ethanol solution of the hydroxypyridine derivative is 1 (8-9). Further, the thermoplastic matrix is selected from one of PP, PE and