摘要
鉴于普通聚氨酯注浆加固材料蓄热温度高,井下应用时存在发烟、着火隐患,以Na2SiO3和NaCl的水溶液为自限温添加剂,与聚醚多元醇混合作为白料,以异氰酸酯作为黑料,制备了一种新型自限温聚氨酯注浆加固材料,研究了其组成、结构、蓄热性能和自限温机理。结果表明,自限温聚氨酯注浆材料的最高蓄热温度显著降低,为101.5℃。注浆材料断面存在很多泡孔,孔中含有固体微球,二者之间存在环形缝隙。自限温添加剂中的Na2SiO3吸收异氰酸酯和水的反应产物CO2,生成了Si(OH)4微球,Si(OH)4的脱水吸热是限制体系温度上升的主要原因;环形缝隙中存在的水溶液的汽化吸热是限制体系温度上升的最后屏障。综合性能测试和井下注浆实验表明,自限温注浆加固材料的性能达到或超过煤体加固用高分子材料的国家行业标准,尤其是在蓄热温度上具有突出优势。
Given ordinary polyurethane grouting reinforced materials releases amount of heat when curing reaction hap- pens, it will cause fuming or catching fire when applying in underground coal mine, so a kind of novel self-controlling temperature polyurethane （SCT-PU）grouting materials, which with Na2SiO3 and NaC1 aqueous solution as self-limiting additives and blending with polyether polyol as white material, with isocyanate as a black material, was prepared. Its composition, structure ,properties and self-limiting temperature heat storage mechanism was studied. The results show that, maximum storage temperature of self-limiting polyurethane grouting material is 101.5 ℃, significantly lower. There are many sections of grouting material foam, hole contains solid microspheres, there is an annular gap between the two. Na2SiO3 in Self-limiting additives absorp CO2 producting in the reaction of isoeyanate and water, generated Si（OH） 4 microspheres. Si（OH） 4 endothermic dehydration is the main reason of the system to limit temperature in- crease. Water present in the annular gap vaporization is the final barrier of the system to limit the heat rise. Combina- tion properties testing and mine grouting industrial experiment show that the production properties reach or exceed coal national industry standard of polyurethane grouting reinforced materials, especially have outstanding advantages instored temperature.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2014年第7期1315-1320,共6页
Journal of China Coal Society
关键词
自限温
聚氨酯
注浆材料
self-controlling temperature
polyurethane
grouting materials
作者简介
杨绍斌（1963-），男，辽宁阜新人，教授，博士。E—mail：lgdysb@163．com
