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16.国内目前的高效减水剂有哪些品种型号,它们的性能怎样呢?国内在目前作为高效减水剂的产品,按主要成分划分有以下几类及一些型号。(1)萘系:它以萘为原料,经磺化、缩合、中和而制成。主要型号有NF、FDN、UNF、SN、NSZ、DH等,它们的工艺路线及取用的原材料基本上一样,因此,性能上基本上相当,只是由于各厂选用原料的纯度不同、工艺控制严格程度不一样,工人操作熟练程度及责任心上的差别,导致产品质量上有一些出入,但一般差别不太大。这类产品减水率较高、引气性较小,适于配制高强混凝土等使用。
16. What types and types of domestic superplasticizers currently exist, and what are their performances? The products currently used as superplasticizers in China are classified into the following types and models according to the main components. (1) Naphthalene series: It is made of naphthalene as a raw material, which is sulfonated, condensed, and neutralized. The main models are NF, FDN, UNF, SN, NSZ, DH, etc. Their process routes and raw materials used are basically the same. Therefore, the performance is basically the same, but due to the different purity of the raw materials used by the plants, and the strict process control The degree is not the same. The difference in worker proficiency and sense of responsibility leads to some differences in product quality, but the general difference is not great. These products have higher water reduction rate and less air-entraining properties and are suitable for use in the preparation of high-strength concrete.