萘系高效减水剂的合成与应用研究

Research on the synthesis and application of naphthalene superplasticizer

以工业萘、硫酸与甲醛等为原料，经磺化、水解、缩合与中和，获得萘系高效减水剂。研究了原料萘含量、硫酸品种、配比、反应时间、反应温度、酸度、加料方式等对萘系高效减水剂性能的影响。结果表明，最佳合成条件为：萘的纯度≥95％，硫酸含量i〉98％，磺化温度160～165℃，磺化时间2h，磺化酸度32％，硫酸采用滴加方式，水解温度110℃，水解时间0．5h，缩合时控制酸度26％，缩合温度105-110℃，缩合时间2．5～3．0h，采用石灰乳中和至pH=7—9。对萘系高效减水剂掺量为1％时，与其他同类产品在净浆流动度、抗压强度、减水率、泌水率、坍落度经时损失等方面进行了比较，取得较好效果，降低了产品成本，提高了产品性能。

The influence of the process parameters, such as material purity, sulphuric acid variety, material ratio, the reaction time, temperature and acidity etc. were studied systemmatically, so the optimal synthesizing process condition were obtained. The materials of naphthalene superplasticizer synthesis include naphthalene,sulphuric acid, formaldehyde etc. The synthesis product were gained through naphthalene sulfonating, hydrolyzing, condensation and neutralization. The result shows that the material naphthalene purity≥95% ;the sulfonating temperature 160 - 165 ℃, period 2 h, acidity 32%, and the sulphuric acid dropwise method were used;the water slowdown temperature 110 ℃, period O. 5 h;the condensation reaction acidity 26% ,temperature 105 - 110 ℃, period 2.5 - 3.0 h;neutralizing with lime milk solution as pH = 7- 9. At the naphthalene superplasticizer adding amount 1%, the application performance were studied compared with other products, such as the net plasm flowage, the anti-pressure intencity, the water slowdown rate, the filter rate, the shunp loss etc. , the preferably result were obtained, as the product performance were improved, and the product manufacturing cost were decreased also.