Method for producing formaldehyde-free low-density crop straw grain board
A low-density, crop-based technology, applied in the direction of manufacturing tools, flat products, pretreatment of molding materials, etc., to reduce costs and reduce material consumption
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Embodiment 1
[0021] Embodiment 1. make density 250kg / m with the present invention 3 Straw particle board with a density and thickness of 50mm.
[0022] Particle size (mm)
[0023] Carry out weighing the amount of material that the hot press drops into once, then put the weighed stalk particles into the mixer, and spray into the binder with a particle diameter of less than or equal to 5 μ under the stirring condition. What the present invention uses is a formaldehyde-free The isocyanate binder, such as the adhesive with the trade name of MDI, requires a stirring coefficient of difference ≤ 10%, and then the evenly stirred straw particles are placed on the liner, and the spraying amount is 2.5% to 2.5% of the dry weight of the straw. 3%, the weight error of laying is controlled within ±1kg, and the density uniformity is controlled within ±8%. . The slab together with the liner is sent into the hot press for heating, pressurized to a thickness of 50mm and solidified to form a raw ...
Embodiment 2
[0024] Embodiment 2. manufacture density with the present invention is 330kg / m 3 , Straw particle board with a thickness of 25mm.
[0025] Particle size (mm)
[0026]Carry out weighing the amount of material that hot press machine drops into once, put the stalk particle of this weighing into mixer then, spray into the MDI glue that particle diameter is less than 5 μ under agitation condition, and the injection amount is 2.5% of the dry weight of stalk granule. %~3%, the difference coefficient of stirring is ≤10%, and then lay the evenly stirred straw particles on the lining board, the weight error of laying is controlled within ±1kg, and the density uniformity is controlled within ±8%. Use a 100-140 ton press to pre-press, so that the straw particles on the lining board form a preliminary slab. The slab together with the liner board enters the hot press machine, heated and pressurized to a thickness of 25mm, solidified and formed into a raw board, and the temperatur...
Embodiment 3
[0027] Embodiment 3. manufacture density with the present invention is 400kg / m 3 1. Straw particle board with a thickness of 5mm.
[0028] Particle size (mm)
[0029] Carry out the measuring material that takes hot press once to drop into by weighing, put the stalk granule of this weighing into mixer then, spray into the MDI glue that particle diameter is less than or equal to 5 μ under agitation condition, the injection amount is 2.5% of the dry weight of stalk granule. %~3%, the difference coefficient of stirring is ≤10%, and then lay the evenly stirred straw particles on the lining board, the weight error of laying is controlled within ±1kg, the density uniformity is controlled within ±8%, and the laying Finally, pre-press with a press of 100 to 140 tons, so that the straw particles on the lining board form a preliminary slab. The slab together with the liner board enters the hot press machine, heated and pressurized to a thickness of 5 mm and solidified to form ...
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Abstract
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