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Preparation method of amination modified sodium alkali lignosulfonate oligomer cathode corrosion inhibitor
The invention provides a preparation method of an amination modified sodium alkali lignosulfonate oligomer cathode corrosion inhibitor. The preparation method comprises the following steps: condensingepoxy chloropropane and sodium hydrogen phosphite to synthesize an alpha-hydroxymethyl-beta-chloromethyl-methyl sodium phosphate intermediate; then extracting and degrading water-soluble alkali lignin to obtain an alkali lignin oligomer, and condensing the alkali lignin oligomer with formaldehyde and urea to obtain an aminated alkali lignin oligomer intermediate; and finally, enabling the alpha-hydroxymethyl-beta-chloromethyl-methyl sodium phosphate intermediate to react with the aminated alkali lignin oligomer intermediate to prepare the aminated modified sodium alkali lignosulfonate oligomer cathode corrosion inhibitor containing -OH, CH2OH, -NH2 and -PO3 groups. The production and use cost of the cathode corrosion inhibitor is reduced; the problem that toxic waste gas is easily generated when a phosphorus-containing cathode corrosion inhibitor is prepared from synthetic chemicals is avoided, the aminated modified sodium alkali lignosulfonate oligomer cathode corrosion inhibitor hasa good effect of retarding corrosion of steel bars in cofncrete under the condition of low mixing amount, and the aminated modified sodium alkali lignosulfonate oligomer cathode corrosion inhibitor has a wide application prospect.
本发明提供了一种胺基化改性碱木质素磷酸钠低聚物阴极阻锈剂的制备方法，首先，环氧氯丙烷与亚磷酸氢钠缩合成α‑羟甲基‑β‑氯甲基‑甲基磷酸钠中间体。然后，提取水溶性碱木质素进行降解得碱木质素低聚物，碱木质素低聚物与甲醛、尿素缩合得胺基化碱木质素低聚物中间体。最后，α‑羟甲基‑β‑氯甲基‑甲基磷酸钠中间体与胺基化碱木质素低聚物中间体反应，制备出含‑OH、CHOH、‑NH、‑PO基团的胺基化改性碱木质素磷酸钠低聚物阴极阻锈剂。本发明降低了阴极阻锈剂生产与使用成本，避免了合成化学品制备含磷基阴极阻锈剂时易产生有毒废气的问题，胺基化改性碱木质素磷酸钠低聚物阴极阻锈剂在低掺量下就具有良好的减缓混凝土中的钢筋锈蚀的作用，具有广阔应用前景。
Preparation method of amination modified sodium alkali lignosulfonate oligomer cathode corrosion inhibitor
The invention provides a preparation method of an amination modified sodium alkali lignosulfonate oligomer cathode corrosion inhibitor. The preparation method comprises the following steps: condensingepoxy chloropropane and sodium hydrogen phosphite to synthesize an alpha-hydroxymethyl-beta-chloromethyl-methyl sodium phosphate intermediate; then extracting and degrading water-soluble alkali lignin to obtain an alkali lignin oligomer, and condensing the alkali lignin oligomer with formaldehyde and urea to obtain an aminated alkali lignin oligomer intermediate; and finally, enabling the alpha-hydroxymethyl-beta-chloromethyl-methyl sodium phosphate intermediate to react with the aminated alkali lignin oligomer intermediate to prepare the aminated modified sodium alkali lignosulfonate oligomer cathode corrosion inhibitor containing -OH, CH2OH, -NH2 and -PO3 groups. The production and use cost of the cathode corrosion inhibitor is reduced; the problem that toxic waste gas is easily generated when a phosphorus-containing cathode corrosion inhibitor is prepared from synthetic chemicals is avoided, the aminated modified sodium alkali lignosulfonate oligomer cathode corrosion inhibitor hasa good effect of retarding corrosion of steel bars in cofncrete under the condition of low mixing amount, and the aminated modified sodium alkali lignosulfonate oligomer cathode corrosion inhibitor has a wide application prospect.
本发明提供了一种胺基化改性碱木质素磷酸钠低聚物阴极阻锈剂的制备方法，首先，环氧氯丙烷与亚磷酸氢钠缩合成α‑羟甲基‑β‑氯甲基‑甲基磷酸钠中间体。然后，提取水溶性碱木质素进行降解得碱木质素低聚物，碱木质素低聚物与甲醛、尿素缩合得胺基化碱木质素低聚物中间体。最后，α‑羟甲基‑β‑氯甲基‑甲基磷酸钠中间体与胺基化碱木质素低聚物中间体反应，制备出含‑OH、CHOH、‑NH、‑PO基团的胺基化改性碱木质素磷酸钠低聚物阴极阻锈剂。本发明降低了阴极阻锈剂生产与使用成本，避免了合成化学品制备含磷基阴极阻锈剂时易产生有毒废气的问题，胺基化改性碱木质素磷酸钠低聚物阴极阻锈剂在低掺量下就具有良好的减缓混凝土中的钢筋锈蚀的作用，具有广阔应用前景。
Preparation method of amination modified sodium alkali lignosulfonate oligomer cathode corrosion inhibitor
胺基化改性碱木质素磷酸钠低聚物阴极阻锈剂制备方法
ZHAO HUI (author) / SU HUI (author) / LI YOUZHENG (author) / CHEN DA (author) / LIAO YINGDI (author) / OUYANG FENG (author)
2020-09-15
Patent
Electronic Resource
Chinese
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