UF resin and its aqueous solution were used to treat poplar veneer at room temperature and atmospheric pressure in this paper .Through the comparative analysis of weight gain rate , capacity rate , water absorption and anti swelling rate of the impregnated specimens before and after , the effects of different UF resin impregnation concentration and immersion time on the dimensional stability of poplar veneer were studied .The results showed that the weight gain rate of poplar wood increased with the increase of the concentra -tion of UF resin, and then increased slowly when the concentration reached 40%.The capacity rate increased rapidly when the con-centration was 10%~25%, but increased slowly from 25%to 55%.The water absorption and anti swelling rate both increased with the increase of UF resin concentration .The weight gain rate of poplar veneer increased greatly after dipping time was 4 hours.With the increase of impregnation time , the change trend of the capacity rate was basically linear , and the immersion time has no significant influence on the water absorption and anti swelling rate of poplar veneer .The application of UF resin and its aqueous solution in the treatment of poplar veneers can improve the dimensional stability .The highest moisture resistance rate could reach 57%, and the ex-pansion rate was up to 58%.
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万方数据
维普
