淀粉接枝丙烯酸/醋酸乙烯酯环保固沙剂的合成及固沙应用

利用溶液聚合法制备了水溶性淀粉接枝丙烯酸（AA）/醋酸乙烯酯（VAc）固沙剂乳液，考察了单体质量比、AA中和度、引发剂用量、聚合温度对乳液性能的影响，采用FT-IR、TG对乳液进行了表征，并初步研究了固沙剂的表面固化效果、抗压强度等固沙性能。结果表明单体质量比(m_AA∶m_VAc)为2∶1、AA中和度为25%、引发剂质量为单体质量的0.8%、聚合温度为80℃时，固沙剂乳液外观、黏度及放置稳定性等均较优；固沙剂在200℃下热稳定性良好，固化作用及抗压强度能够满足实际固沙应用中的要求。

Synthesis and characterization of soluble starch graft polymer as a new sand fixing agent

A new sand fixing agent has been synthesized by means of graft copolymerization of soluble starch with acrylic acid (AA) and vinyl acetate (VAc). The effects of varying the ratio of monomers, the extent of neutralization of acyclic acid, the initiator dosage, as well as the polymerization temperature on the stability and properties of the resulting emulsions were investigated in detail. The copolymers were characterized by infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis. The crusts formed on shifting sands, viscosities and compressive strengths were studied. The results showed that a sample synthesized with an AA, VAc mass ratio (m_AA∶m_VAc)of 2∶1, 25% neutralization of AA, 0.8% initiator and a polymerization temperature of 80℃, had a suitable viscosity, compressive strength and thermostability (under 200℃) to achieve good sand fixing performance for practical applications.