Method for producing particleboard by using lignin adhesive
A technology of lignin glue and particle board, which is applied in the jointing of wooden veneers, wood fiber material adhesives, adhesive additives, etc., can solve the problems of excessive formaldehyde content, scratches, long service life, etc., and achieve human health High index, improved safety performance, and excellent moisture-proof performance
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Embodiment 1
[0019] The production process of the lignin adhesive is as follows: In order to reduce the cost of raw materials, the pulp black liquor pulped by the alkali cooking method using bagasse as raw material is processed to obtain lignin with a content of more than 85%, and 70wt% lignin is added to the lignin Sulfuric acid, after stirring evenly, heat up to 140-160°C, sulfonation reaction for 1-2 hours; through the central circulation tube evaporator, the circulation speed is 0.4m / s-0.5m / s, and the moisture content of the output is controlled to 30wt% , precipitation, filtered and dried to a water content of 15wt%; add phenol according to lignin:phenol 1:1 (weight ratio), control the temperature at 85-95°C, keep the temperature for 1 hour, and finally adjust the pH with 30wt% sodium hydroxide to 6.5-7.0; 40-60 parts of the obtained reactant; 15-20 parts of potato starch; 1-5 parts of silane coupling agent; 1-5 parts of antioxidant; 3-5 parts of ultraviolet absorber; -0.2 parts, mix ...
Embodiment 2
[0022] The veneer flakes are 0.1-0.25mm, mixed with the lignin adhesive prepared in Example 1, and the sizing amount is 250g / m 2 , pre-pressing, the conditions are: temperature: 100°C, pressure: 0.7 MPa, time: 0.6min / mm; hot pressing, the conditions are: temperature: 150°C, pressure: 0.8 MPa, time: 0.7min / mm; stacking maintenance, The specific method is: at room temperature, set up the bonded particleboard layer by layer with wooden strips, and the upper and lower layers of wooden strips are arranged in the word "well" for 28 hours; use coarse sand and fine sandpaper to polish and determine the thickness, paste Low wood surface, polished wood surface, stick aluminum oxide wear-resistant paper on the wood surface, heat press, temperature 170°C, pressure 2.0MPa, heat dissipation finishing, beating, that is to say.
Embodiment 3
[0024] The veneer flakes are 0.1-0.25mm, mixed with the lignin adhesive prepared in Example 1, and the glue amount is 280g / m 2 , pre-pressing, the conditions are: temperature: 100°C, pressure: 0.8 MPa, time: 0.8min / mm; hot pressing, the conditions are: temperature: 150°C, pressure: 1.0 MPa, time: 0.9min / mm; stacking maintenance, The specific method is as follows: at room temperature, set up the bonded particle board layer by layer with wooden strips, and the upper and lower layers of wooden strips are arranged in the shape of "well" for 30 hours; Low wood surface, polished wood surface, paste aluminum oxide wear-resistant paper on the wood surface, hot press at 170°C, pressure 2.5MPa, heat dissipation finishing, edge beating, that is.
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