【摘要】 合成了阳离子羟丙基瓜尔胶(CHPG),研究了该系列瓜尔胶衍生物对旧报纸脱墨浆的助留助滤作用。结果表明,在一定用量范围内,随着CHPG用量增加,细小组分留着率提高,浆料的打浆度下降;当氮含量为1.98%的CHPG用量为0.6%时,浆料打浆度下降17°SR,细小组分留着率增加60个百分点;而相同氮含量的阳离子瓜尔胶(CGG)用量为0.6%时,细小组分留着率增加48个百分点,表明羟丙基侧链促进了吸附架桥作用。阳离子取代度越大,CHPG的助留助滤性能越好;CHPG能够补偿细小组分留着率提高带来的强度损失。更多还原

【Abstract】 This paper discussed retention and drainage properties of a series of cationic-hydroxypropyl guar gum derivatives(CHPG),which were successfully synthesized in our lab.The experimental data showed that with increasing dosage of CHPG,the fines retention increases and beating degree of the pulp descends.For 0.6% dosage of CHPG1,beating degree decreases by 17 °SR which indicates the pulp drainage property increased by 38.6%.The fines retention is 2.3 times higher than that of the blank sample when the dosage of CHPG1 is 0.6%.However,cationic guar gum(CGG) with the same N content has a poor performance.With the same dosage,the drainage property only increases by 27.5%,and fines retention only increases by 48.0%.This shows that side-chain of hydroxypropyl groups is beneficial to adsorption bridge behavior of fines suspension.Better performance of CHPG with the increase of N content in CHPG is observed.Addition of CHPG is able to compensate the strength loss of handsheet resulting from the increase of fines retention to some extent.更多还原