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根据“两性离子聚合物泥浆处理剂作用”的原理，对磺化酚醛树脂（ＳＭＰ）进行了改性，合成出了分子结构中同时具有有机阳离子、有机阴离子基团的一种新型抗温、抗盐泥浆降失水剂———两性酚醛树脂（ＡＰＲ）。实验证明：①ＡＰＲ不仅继承了磺化酚醛树脂的抗温、抗盐、泥饼可压缩性好及随无机盐浓度增加，温度升高，作用时间延长，降失水效果越好的优点，还具备了较强抑制泥页岩水化的能力，同时比磺化酚醛树脂具有较高使用效率。②两性酚醛树脂性能与其分子结构中有机阳离子、有机阴离子基团比例有关。
According to the principle of “action of zwitterionic polymer mud treatment agent”, the sulfonated phenolic resin (SMP) was modified to synthesize a new type of anti-temperature and anti-organic compound which has both organic cation and organic anion in its molecular structure Salt mud fluid loss agent --- amphoteric phenolic resin (APR). Experiments show that: ① APR not only inherits the advantages of sulfonated phenolic resin, such as high temperature resistance, salt resistance, compressibility of cake, and the increase of inorganic salt concentration, temperature, duration of action and loss of water, A stronger ability to inhibit the shale hydration, while the sulfonated phenolic resin has a higher efficiency. ② phenolic resin properties and its molecular structure of organic cation, organic anion groups on the ratio.