Preparation method of moisture-proof mildew-resistant medium density fiberboard
A fiberboard and medium density technology, which is applied in the field of preparation of moisture-proof and mildew-proof medium-density fiberboard, can solve the problems of restricting the use range of medium-density fiberboard, shortening the service life of MDF, and limiting the application range of MDF, so as to avoid water-absorbing deformation, The effect of improving the binding ability and delaying the aging phenomenon
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Embodiment 1
[0021] A method for preparing a moisture-proof and mildew-proof medium-density fiberboard, comprising the following steps:
[0022] (1) Fiber drying: crush the plant material to a particle size of 1-3 mm, the weight ratio of the plant material tree to crop straw is 4:1, add 40% of the fiber weight to the crushed fiber at a concentration of 65mg / L sulfamic acid solution, stir evenly, let stand and infiltrate for 2 days, and freeze-dry the wet pulverized fiber to a water content of 5-7%, which is beneficial to enhance the binding force between cellulose and lignin, and prevent the density board from occurring after absorbing water. Expansion and deformation, keep the structural integrity of density board, get dry fiber;
[0023] (2) Acid-base treatment: Add 20% of dry fiber weight to 3% acetic acid solution with a volume concentration of 3%, stir evenly, let stand at room temperature and pressure for 20 hours, then add 40% of dry fiber weight to a concentration of 32mg / L Sodium...
Embodiment 2
[0029] A method for preparing a moisture-proof and mildew-proof medium-density fiberboard, comprising the following steps:
[0030] (1) Fiber drying: crush the plant material to a particle size of 1-3 mm, the weight ratio of the plant material tree to crop straw is 4.5:1, add 43% of the fiber weight to the crushed fiber at a concentration of 70mg / L sulfamic acid solution, stir evenly, let stand and infiltrate for 2 days, and freeze-dry the wet pulverized fiber to a water content of 5-7%, which is beneficial to enhance the binding force between cellulose and lignin, and prevent the density board from occurring after absorbing water. Expansion and deformation, keep the structural integrity of density board, get dry fiber;
[0031](2) Acid-base treatment: Add 23% of dry fiber weight to 4% acetic acid solution with a volume concentration of 4% of the dry fiber, stir evenly, let stand at room temperature and pressure for 22 hours, then add 43% of the dry fiber weight to a concentra...
Embodiment 3
[0037] A method for preparing a moisture-proof and mildew-proof medium-density fiberboard, comprising the following steps:
[0038] (1) Fiber drying: crush the plant material to a particle size of 1-3 mm, the weight ratio of the plant material tree to crop straw is 5:1, add 45% of the fiber weight to the crushed fiber at a concentration of 75mg / L sulfamic acid solution, stir evenly, let stand and infiltrate for 3 days, and freeze-dry the wet pulverized fiber to a water content of 5-7%, which is beneficial to enhance the binding force between cellulose and lignin, and prevent the density board from occurring after absorbing water. Expansion and deformation, keep the structural integrity of density board, get dry fiber;
[0039] (2) Acid-base treatment: Add 25% of dry fiber weight to 5% acetic acid solution by volume, stir evenly, let stand at room temperature and pressure for 24 hours, then add 45% of dry fiber weight to a concentration of 36mg / L Sodium hydroxide solution, sti...
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