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

Inactive Publication Date: 2019-05-31
李振洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Density board, the full name of density fiberboard, is made of wood fiber or other plant fiber as raw material, prepared by fiber, applied with synthetic resin, and pressed under heat and pressure; according to its density, it can be divided into high-density fiberboard, high-density fiberboard, Medium-density fiberboard and low-density fiberboard; MDF is widely used in domestic furniture, decoration, musical instruments and packaging due to its uniform structure, fine material, stable performance, impact resistance, and easy processing, but MDF is made of crushed fibers. Therefore, the moisture-proof performance of MDF, especially MDF, is poor, and it is prone to mildew, warping and even pulverization after absorbing water, which limits the scope of use of MDF
[0003] The existing patent document CN 108068183 A discloses a method of manufacturing a moisture-proof and waterproof density board, which is to apply a hydrophobic sol on the surface of the density board, and heat the density board after the density board absorbs the hydrophobic sol, so that the hydrophobic sol is cured to form a film , and the solvent is volatilized, this method is simple and easy to operate, but after heating, the solvent in the hydrophobic sol volatilizes and leaves gaps in the density board, which reduces the strength of the density board, limits the scope of application of the density board, and does not After absorbing water, the density board is easy to mold and shorten the service life of the density board

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention mainly belongs to the technical field of artificial board processing, and discloses a preparation method of a moisture-proof mildew-resistant medium density fiberboard. The preparation method comprises steps of fiber drying, acid and alkali treatment, high pressure processing, glue applying processing, and hot pressing moulding. The preparation method is simple; the obtained moisture-proof mildew-resistant medium density fiberboard is high in strength and excellent in wear resistance; water absorption capacity is low; moistureproof and mildew resistance are excellent; defect of commercially available medium density fiberboards that water absorption is easily caused is avoided. According to the preparation method, plant raw material is crushed so as to obtain crushed fiber, asulphamic acid solution is added into the crushed fiber, after uniform infiltration, freeze drying is carried out, it is beneficial for increasing of the bonding force between cellulose and lignin, expansion and defomation of density boards caused by water absorption are avoided, and density board structure integrity is maintained.

Description

technical field [0001] The invention mainly relates to the technical field of wood-based panel processing, in particular to a method for preparing a moisture-proof and mildew-proof medium-density fiberboard. Background technique [0002] Density board, the full name of density fiberboard, is made of wood fiber or other plant fiber as raw material, prepared by fiber, applied with synthetic resin, and pressed under heat and pressure; according to its density, it can be divided into high-density fiberboard, high-density fiberboard, Medium-density fiberboard and low-density fiberboard; MDF is widely used in domestic furniture, decoration, musical instruments and packaging due to its uniform structure, fine material, stable performance, impact resistance, and easy processing, but MDF is made of crushed fibers. Therefore, the moisture-proof performance of MDF, especially MDF, is poor, and it is prone to mildew, warping and even pulverization after absorbing water, which limits the...

Claims

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Application Information

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IPC IPC(8): B27K3/02B27K5/04B27N3/00B27N3/04B27N3/12
Inventor 李振洋
Owner 李振洋
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