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中文摘要：
以异丙醇为溶剂，采用先阴离子化后阳离子化工艺合成了含磷酸酯和季铵基团的两性瓜尔胶，并通过^1H—NMR证实自制阴离子中间体和两性瓜尔胶的官能团结构。研究了反应温度、阴离子中间体、阳离子单体、碱用量对产物的磷、氮含量的影响，确定优化条件为：反应温度60℃、醚化时NaOH用量5％、阴离子中间体及阳离子单体用量分别为15％和28％，此时产物的磷和氮含量分别为0．44％和0．8％。该新型两性瓜尔胶用于ONP浆体系，能明显提高手抄片的强度性能，当其用量为0．2％时可使印刷表面强度提高24．5％，优于工厂现用两性淀粉。
英文摘要：
The amphoteric guar gum derivative containing phosphate and quaternary-amine groups was synthesized in isopropanol solvent. Anionic phosphate was introduced at first through the homemade anionic intermedium reagent and then cationic groups were grafted at the presence of cationic etherifying agent. The anionic intermedium reagent and guar gum derivative were characterized by ^1H-NMR. The effects of reaction temperature, anionic/cationic reagent doses and NaOH dose on P/N content of the purified product were investigated. The optimal conditions were obtained as follows： reaction temperature 60℃, 5% dose of NaOH （on guar gum content） at etherification process, 15%/ 28% doses of anionic/cationic reagent. Meanwhile the P/N contents in the guar gum derivative reach 0.44% and 0.8%. When the product is used in ONP system, it exhibits better ability in increasing handsheets＇ strength properties in comparison with amphoteric starch which has been using in the industry. This guar gum derivative can increase the surface strength by 24.5% （compared with the control sample） at the dosage of 0.2%.
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