酚醛树脂原料配比对麻毡板性能的影响

研究了酚醛树脂的不同原料配比对麻毡板性能的影响。结果表明：1)麻毡板的内结合强度随着F／P摩尔比的增加而增加，随尿素用量的增加而降低；在一定范围内，碱用量、甲基葡萄糖甙(TD)的用量对其影响不大。2)麻毡板的吸水厚度膨胀率随着F／P摩尔比的增加而减少，随着碱、尿素、甲基葡萄糖甙用量的增加而增加。适宜的原料配比为：尿素量在树脂总量的4％，F／P摩尔比为2．0，NaOH／P摩尔比为0．06，甲基葡萄糖甙在树脂总量的4％。

The Effects of Phenol/Formaldehyde Ratio and Additives on the Properties of Kenaf-felt Boards

The authors studied the effects of the mole ratio of formaldehyde to phenol (F/P) and the dosage of additives including sodium hydroxide, urea and methyl glucoside on the properties of kenaf felt boards, Results indicated that: 1) The IB of kenaf felt boards could be improved by raising the F/P mole ratio and the dosage of sodium hydroxide, whereas it decreased with the increase of urea, and it was little influenced by methyl glucoside to a certain degree. 2) The TS of kenaf felt boards declined with an increase in the F/P mole ratio. However, it increased while adding sodium hydroxide, urea and methyl glucoside. 3) The optimal concentration of urea was less than 4% of the amount of resin, the mole ratio of F/P and NaOH/P was 2.0 and 0.06 respectively, and the ratio of methyl glucoside to phenol should be less than 4%.