Preparation and evaluation of a dispersant for gypsum paste from acid hydrolysis lignin
Preparation and evaluation of a dispersant for gypsum paste from acid hydrolysis lignin
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DOI：
10.1002/app.22119
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发表时间：
2005-12-15
影响因子：
3
通讯作者：
Fukushima, K
中科院分区：
文献类型：
--
作者：
Matsushita, Y;Imai, M;Fukushima, K
以木质素为原料制备了羧基分散剂，并对羧基分散剂的分散效果进行了评价。本研究选择硫酸木质素（SAL）作为酸性木质素的代表。为了将SAL转化为水溶性聚合物，首先用硫酸对其进行酚化以增强其化学反应性。羧基的引入用两种方法进行。一种是用溴乙酸进行羧甲基化，另一种是用甘氨酸、肌氨酸和亚氨基二乙酸进行曼尼希反应。羧甲基化产物[羧甲基苯酚化硫酸木质素（CP-SAL）]具有1.4个羧甲基基团/苯酚化苯基丙烷木质素基本单元，可溶于水。Mannich反应产物也可溶于水，羧基的添加量低于CP-SAL。令人惊讶的是，所有制备的水溶性聚合物都具有比商业木质素硫酸盐更高的石膏膏的粘度。这可能是由于酸性木质素衍生物的分子量较高。(c)2005 Wiley Periodicals，Inc.
The preparation of dispersants with carboxyl groups from acid lignin (a byproduct in the saccharification process of woody materials that are renewable resources) was investigated, and their dispersion efficiency was evaluated. In this study, sulfuric acid lignin (SAL) was selected as a representative acid lignin. To convert SAL to water-soluble polymers, it was first subjected to phenolation with sulfuric acid to enhance its chemical reactivity. The introduction of a carboxy group was carried out with two methods. One was carboxymethylation with bromoacetic acid, and the other was the Mannich reaction with glycine, sarcosine, and iminodiacetic acid. The carboxymethylation product [carboxymethylated phenolized sulfuric acid lignin (CP-SAL)] with 1.4 carboxymethyl groups per phenolated phenylpropane lignin base unit was soluble in water. The Mannich reaction products were also soluble in water with a lower addition of carboxyl groups than that for CP-SAL. Surprisingly, all the prepared water-soluble polymers possessed a higher dispersibility for gypsum paste than commercial lignosulfate. This may be due to the higher molecular weights of acid lignin derivatives. (c) 2005 Wiley Periodicals, Inc.