木质素改性酚醛树脂微球的制备与工艺研究

Preparation and Technology of Lignin Modified Phenolic Resin Microspheres

利用木质素部分替代苯酚与甲醛反应制备木质素改性酚醛树脂微球,研究木质素的替代量、酚醛物质的量之比、分散剂用量和催化剂用量对产物的影响。结果表明:木质素的加入显著降低了改性酚醛树脂(LPR)微球的粒径,当木质素替代量为40%(质量分数)时,苯酚和甲醛物质的量之比为1:1.3、分散剂的用量为2.5%(质量分数)、催化剂用量为2.5%(质量分数)时,可以制备出粒径在50~100μm的改性酚醛树脂微球。木质素的加入提高了LPR微球的热稳定性,且其含碳量依旧很高。

Phenolic resin microspheres modified by lignin were prepared by reaction of formaldehyde with phenol partially replaced by lignin.The effects of lignin replacement,molar ratio of phenol to formaldehyde,dosage of dispersant and catalyst on the products were studied.The results showed that the addition of lignin significantly reduced the particle size of the modified phenolic resin microspheres(LPR).When the replacement amount of lignin was 40%(mass fraction),molar ratio of phenol to formaldehyde was 1:1.3,dosage of dispersant was 2.5%(mass fraction)and dosage of catalyst was 2.5%(mass fraction),the particle size of the modified phenolic resin microspheres ranged from 50μm to 100μm was prepared.The addition of lignin improved the thermal stability of LPR microspheres,and the carbon content of LPR microspheres was still high.