强抗钙强抑制改性淀粉的合成及性能评价

Synthesis and Evaluation of a Highly Calcium Resistant and Strongly Inhibitive Modified Starch

以淀粉和自制新型烯类单体为原料合成了改性淀粉接枝共聚物,并对该改性淀粉接枝共聚物性能进行了评价。结果表明,该改性淀粉在不同基浆中加量为2.0%~3.0%时,均可将滤失量控制在10 m L之内;抗温达130℃;尤其是具有强抗盐抗钙性能,抗氯化钠、氯化钙均可至饱和,并且随含盐量的增加,降滤失效果和提黏切能力反而增强。表观黏度上升率实验和黏土块浸泡实验结果表明,由于高含量阳离子基团的引入,该改性淀粉具有较好的抑制黏土水化分散性能。

A starch copolymer was developed through draft copolymerization of starch and newly prepared alkene monomer.In laboratory experiments,this starch copolymer（modified starch） showed good filtration control performance in fresh water base mud,saltwater base mud,saturated saltwater base mud,seawater base mud,compound saltwater base mud,and calcium chloride mud.It also showed good stability at high temperature（130 ℃） and good tolerance to salt and calcium contamination to saturation.Filter loss of a mud treated with this modified starch was decreasing with an increased salt and calcium contamination.Introduction of cationic groups into the molecules of the modified starch rendered it good inhibitive capacity.