Method for producing wood floor by using lignin adhesive
A technology of lignin glue and wooden floor, which is applied in the field of wood-based panel production, can solve the problems of unqualified adhesive quality, unqualified product quality, and lax law enforcement and supervision, and achieve superior moisture-proof performance, low production cost, and water absorption. Good results
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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; take 40-60 parts of the obtained reactant; add 15-20 parts of potato starch; 1-5 parts of silane coupling agent; 8-15 parts of high temperature resistant filler; Then use a three-ro...
Embodiment 2
[0022] Select veneers of the same size, and coat the veneer with the lignin adhesive prepared in Example 1, with a sizing rate of 250g / m 2 , pre-pressing, the conditions are: temperature: 100°C, pressure: 0.7Kpa, time: 0.6min / mm; hot pressing, the conditions are: temperature: 150°C, pressure: 0.8Kpa, time: 0.7min / mm; stacking maintenance, The specific method is: at room temperature, set up the bonded wooden floor layer by layer with wooden strips, and the upper and lower layers of wooden strips are arranged in the shape of a "well" for 28 hours; use coarse sand and fine sandpaper to polish and determine the thickness. Paste the low wood surface, polish the wood surface, paste the aluminum oxide wear-resistant paper on the wood surface, hot press at a temperature of 170°C and a pressure of 2.0MPa, heat dissipation finishing, and edge beating.
Embodiment 3
[0024] Select veneers of the same size, and coat the veneer with the lignin adhesive prepared in Example 1, with a sizing amount of 280g / m 2 , pre-pressing, the conditions are: temperature: 100°C, pressure: 0.8Kpa, time: 0.8min / mm; hot pressing, the conditions are: temperature: 150°C, pressure: 1.0Kpa, time: 0.9min / mm; stacking maintenance, The specific method is: at room temperature, set up the bonded wooden floor layer by layer with wooden strips, and the upper and lower layers of wooden strips are arranged in the shape of a "well" for 30 hours; use coarse sand and fine sandpaper to polish and determine the thickness, Paste the low wood surface, polish the wood surface, paste the aluminum oxide wear-resistant paper on the wood surface, heat press at a temperature of 170°C, and a pressure of 2.5MPa, heat dissipation finishing, and edge beating.
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