磺甲基酚醛树脂高温交联影响因素及控制方法

考察磺甲基酚醛树脂高温交联的机制及影响因素,提出两种控制磺甲基酚醛树脂高温交联的方法。结果表明:体系的p H值越高,矿化度越大,反应温度越高、时间越长,磺甲基酚醛树脂交联越剧烈;磺甲基酚醛树脂分子间的交联反应主要是酚环上羟甲基(苄羟基)与活泼氢发生脱水缩合生成亚甲基桥的反应;氧化剂和磺化剂可以减少酚环上的羟甲基的数量,在聚磺钻井液中可以有效控制磺甲基酚醛树脂的高温交联,提高钻井液的高温稳定性。

Influence factors and control methods of high-temperature crosslinking for sulphonated methyl phenolic resin

The crosslinking mechanism and the associated influence factors of sulphonated methyl phenolic resin(SMP) at high temperatures were investigated. And two control methods of high-temperature crosslinking for SMP were proposed. It is found that the crosslinking is promoted with higher pH value, bigger salinity, higher reaction temperature and longer time. The solid nuclear magnetic resonance (NMR) and infrared results indicate that the crosslinking is a dehydration condensation reaction between the hydroxymethyl and active hydrogen on the phenol ring, which forms methylene bridge. Hence, oxidant and sulfonating agent can be utilized to reduce the hydroxymethyl amount on the phenol ring. In this way, the crosslinking reaction of SMP at high temperature could be controlled, through which the stability of polysulfonate drilling fluid at high temperature is improved.