季铵半纤维素分散剂的合成及应用

Synthesis and Application Study of Quaternary Ammonium Hemicellulose Dispersant

以粘胶纤维生产废液提取的半纤维素为原料,2,3-环氧丙基三甲基氯化铵为醚化剂制备了季铵半纤维素。通过正交实验确定了季铵半纤维素的最佳合成条件,半纤维素与2,3-环氧丙基三甲基氯化铵质量比1∶2,Na OH用量为原料总质量的5%,反应温度70℃,反应时间4 h时,所得季铵半纤维素取代度可达53.1%。以季铵半纤维素为分散剂应用于钛白浆料,考察了季铵半纤维素分散剂的分散性能。测试表明,季铵半纤维素分散剂最佳用量为浆料总质量的0.4%,流动点用量为0.021 5 g。

The quaternary ammonium hemicellulose was prepared from the raw material of hemicelluloses which had been isolated from the production waste liquid of viscose fiber, during the process of which 2,3-epoxypropyl trimethyl ammonium chloride was used as etherifying agent. The optimal conditions for the synthesis of quaternary ammonium hemicellulose were determined by orthogonal experiment, in which the mass ratio of the hemicellulose and 2,3-epoxy propyl trimethyl ammonium chloride was 1 ： 2, the dosage of NaOH was 5 % of the total mass of raw materials, the reaction temperature was 70 ℃, and the reaction time was 4 h;under such conditions, the substitution degree of quaternary ammonium hemicellulose could be up to 53.1%. The quaternary ammonium bemicellulose as dispersant was used in titanium dioxide slurry. The dispersion property of quaternary ammonium hemicellulose dispersant was studied. The test showed that the best dosage of quaternary ammonium hemicellulose dispersant was 0. 4% of the total mass of slurry,and the dosage on flowpoint was 0. 021 5 g.