一种复合交联剂的制备及性能评价

Preparation and evaluation of a composite crosslinking agent

水溶性酚醛类交联剂保存时间短、易固化且挥发性较强。为此,通过采用分子设计和引入适量促交联剂制备了一种基于水溶性酚醛树脂的复合交联剂。首先使用苯酚和甲醛为原料,通过两步法合成水溶性优异的多羟甲基酚醛树脂,随后加入适量金属离子促交联剂用以改善其成胶性能。两步法合成使得甲醛和苯酚反应更为充分,产物主要以多羟甲基酚的形式存在,因而该复合交联剂无刺激性气味,保存时间长,金属离子促交联剂的引入显著改善了其成胶性能。实验结果表明,该复合交联剂用量在0.1%以上即可成胶,较传统酚醛类交联剂其成胶强度显著增加,成胶时间8~48h可控,成胶温度范围为60~120℃。采用此复合交联剂得到的凝胶体系稳定性强,成胶强度在两个月以上无减弱趋势。该复合交联剂在油田堵水调剖领域具有极大的应用前景。

A water-soluble phenolic resin composite crosslinking agent was synthesized by the combination of water-soluble phenolic resin and metal ions promote cross-linking agent. The water-soluble excellent multi-methylol phenolic resin was synthesized by two-step method,followed by addition of an appropriate amount of metal ions to improve their gelling properties. The two-step method could promote the reaction of phenol and formaldehyde,so the main product was multi-methylol phenolic resin. The introduction of metal ions promoted cross-linking agent to make excellent gelling properties. This new kind of crosslinking agent was odorless,low toxicity,and efficient. Based on this kind of water-soluble phenolic resin composite crosslinking agent,the partially hydrolyzed polyacrylamide showed good gelling properties. The minimum amount of cross-linking agent was 0.1% with high gelling strength; its gelation temperature could be adjusted from 60-120℃ and its gelling time could be controlled between 8h and 48 h. The stability of gel system was more than 60 days. The composite crosslinking agent has great prospects in the field of oilfield water shutoff profile.