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本减水剂的主要成分为萘和甲基萘混合物的磺酸-甲醛缩合物盐类,是以萘和甲基萘80:20～20:80的混合物为原料,经磺化然后同甲醛缩合而制成。其优点是制造时易于进行缩合反应,加气性优良。历来的混凝土减水剂,一般都用水质素磺酸盐、羟基羧酸盐、萘磺酸甲醛高缩物盐等。但木质素系及羟基羧酸盐系掺过量时,混凝土发生凝结迟延、硬化不良等现象。根据水泥分散方法,萘磺酸甲醛高缩物即使掺过量也比较安全,且在某个范围内随掺量增
The main component of the water reducer is a sulfonic acid-formaldehyde condensate salt of a mixture of naphthalene and methylnaphthalene, which is a mixture of naphthalene and methylnaphthalene 80:20 to 20:80, which is sulfonated and then condensed with formaldehyde. And made. The advantage of this is that it is easy to carry out the condensation reaction at the time of manufacture, and has good air-entraining properties. Historically, concrete water-reducing agents have generally used water-sugar sulfonates, hydroxy carboxylates, and naphthalene sulfonic acid-formaldehyde high-contraction salts. However, when the lignin system and hydroxycarboxylic acid salt are excessively added, the concrete will be delayed in condensation and hardened. According to the cement dispersion method, naphthalenesulfonic acid formaldehyde high-concentrates are safe even if they are added in excess, and they increase with the addition amount within a certain range.