Study on Impacts of pH Value on Paulownia Wood Color
摘要
Impacts of acid and alkali on paulownia wood are studied, and the effects of weak alkali solutionon stain prevention of paulownia wood are tested and analyzed. It shows that pH value affects paulowniawood color, and that white value of paulownia wood is prone to decrease and chromatism rises underacidity condition. Under alkalescence condition, whiteness of paulownia wood rises and chromatismdecreases, color and luster obviously tend to be bright. The alkali solution with concentration of 0.25% canpromote the penetrability of paulownia wood, dissolve some extractives containing stain precursor chemicals,strengthen stain prevention of paulownia wood, but can not contaminate board surface. Anti-stain reagenthas effect on prevention stain of paulownia wood, but only using it for controlling paulownia wood stainwill induce stain-returning phenomenon. Using both weak alkali solution and anti-stain reagent has bettereffect than just using reagent, the treatment by concentration of 0.25% weak alkali solution with anti-stainreagent can make controlling effect even both inside and outside.