A method for preparing lignin phenolic resin adhesive by treating papermaking waste liquid with microwave-cuo
A technology of phenolic resin glue and papermaking waste liquid, applied in adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of reduced bonding strength, high cost, and low phenol substitution rate, and achieve The effect of improving activity, large activity, and increasing replacement rate
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Embodiment 1
[0018] Embodiment 1: Drawing and determination of phenolic hydroxyl concentration standard curve
[0019] In this paper, the FC method (Folin-Ciocalteu reagent method) was used to measure the content of phenolic hydroxyl groups in lignin. Through quantitative analysis of ultraviolet spectroscopy, the relationship between the concentration of phenolic hydroxyl groups and absorbance was obtained: Y = -0.002 + 0.01241 * X R = 0.99996. This straight line was used as a standard curve for measuring the concentration of phenolic hydroxyl groups.
Embodiment 2
[0020] Embodiment 2: the mensuration of free formaldehyde in the resin glue
[0021] According to the different absorbances at 412nm of different concentrations of formaldehyde, a UV-Vis spectrophotometer is used to make a standard curve of formaldehyde's ultraviolet absorption, thereby measuring the free formaldehyde content in the resin. (National standard: ≤2.0% for cold pressing, ≤0.3% for others), the measured standard curve equation is: Y=0.0152+0.04485*X R=0.99999.
Embodiment 3
[0022] Embodiment 3: the control of resin glue discharging time
[0023] The reaction is stopped when the viscosity of the resin measured by Brookfield RVDV-Ⅲ rheometer-cone and plate viscometer is about 0.15~0.16Pa·s (temperature is 90°C), and the material can be discharged after cooling to 40°C.
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