Method for preparing highly-damp-proof thin type medium density fiberboard
A medium-density, fiberboard technology, applied in the field of preparation of high moisture-proof thin medium-density fiberboard, can solve the problems of limited use, poor moisture-proof performance of medium-density fiberboard, etc., and achieve the effects of moderate cost, improved water resistance, and simple production process
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[0025] Example 1: Using radiata pine and fresh poplar as raw materials (pine radiata: poplar=3:1), the pressing thickness is 2.77mm and the density is 760kg / m 3 The high moisture-proof thin medium density fiberboard. The process steps are as follows: the two raw materials are mixed first, the chips are washed with water to remove the silt, and then the mixed wood chips with a length of 30mm, a width of 20mm and a thickness of 3mm are obtained through a shaker. The wood chips are preliminarily softened by pre-cooking, cooked at a pressure of 0.8 MPa for 3 minutes, and enter the heat mill for heat grinding at a pressure of 0.6 MPa, while adding molten paraffin which accounts for 3% of the dry fiber. Apply PMUF resin accounting for 12% of the absolute dry fiber, add 1.5% composite liquid curing agent of resin mass when adjusting the glue (the mass ratio of the curing agent is P-MDI: ammonium sulfate = 8: 2), and the two are mixed through a static mixer After being uniform, it is s...
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[0027] Example 2: Using radiata pine and fresh poplar as raw materials (radiata pine: poplar=3:1), pressing thickness 5.70mm, density 780kg / m 3 The high moisture-proof thin medium density fiberboard. The process steps are as follows: first mix the two raw materials, the chips are washed with water to remove the sand, and then shake the sieve to obtain a mixed wood chip with a length of 30mm, a width of 20mm and a thickness of 3mm. The wood chips are preliminarily softened by pre-cooking, cooked at a pressure of 0.7 MPa for 3 minutes, and then enter the heat mill for heat grinding at a pressure of 0.6 MPa, while adding molten paraffin which accounts for 2% of the dry fiber. Apply PMUF resin accounting for 11.5% of the absolute dry fiber, add 1% composite liquid curing agent (the mass ratio of the curing agent is P-MDI: ammonium sulfate = 9:1) when adjusting the glue, and mix the two through a static mixer After being uniform, it is sprayed onto the fiber through the steam sizing...
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