表面硼改性的纳米交联剂在中性条件下的交联性能

摘要

Orgonoboron (OBC) was coated onto silica nanoparticles by two-step surface modification resulting in boron-modified nano crosslinker (NBC).OBC was bounded through B-N.TEM shows that the mean particle size of NBC lies within the range of 20-50 nm.With the decrease of the mass ratio of JT-1 and OBC,the particles size of NBC increases.Gels crosslinked with NBC at pH 7 maintain great rheological performance at 100 ℃.The decrease of the mass ratio of JT-1 and OBC leads to lower crosslinking efficiency.%利用两步合成法将有机硼(OBC)修饰于纳米二氧化硅表面,制备了一种纳米硼交联剂(NBC).傅里叶红外光谱证明OBC通过与偶联剂3-氨丙基三乙氧基硅烷反应生成B-N键修饰于JT-1之上.TEM测试显示NBC颗粒粒径为20～50 nm,且随着JT-1与OBC质量比的减小,纳米硼交联剂的粒径逐渐增大,分散性逐渐变差.NBC交联的HPG冻胶可在pH=7条件下拥有良好的耐温耐剪切性及破胶返排性能.在100℃下剪切1h黏度仍能保持在100 mPa·s以上.随着JT-1与OBC质量比的减小,NBC交联效率降低,最佳交联比增加,交联冻胶耐温耐剪切性及粘弹携砂性变差.