丙烯酸酯接枝木质素磺酸钠共聚物乳液土壤固化剂的合成及性能

Synthesis and properties of acrylate grafted sodium lignosulfonate copolymer iotion soil curing agent

为了研究出稳定性强、经济环保、抗水性良好的有机高分子类土壤固化剂,选取丙烯酸(AA)、丙烯酸丁酯(BA)、苯乙烯(St)为功能单体,以木质素磺酸钠(SLS)进行接枝共聚,利用反应型乳化剂ANPEO10和DNS-86提升乳化效率及稳定性,采取预乳化半连续加料方式和种子乳液法进行接枝反应,制得一种新型高分子乳液土壤固化剂PAAB与PAAS,对其进行结构表征和性能测试。结果表明高分子乳液性能稳定,TSI均小于0.2;加入固化土中,其交联网状结构包覆土颗粒,乳液中的功能基团与土壤中阳离子键合,形成凝胶物质,固化土/水表面接触角可达到91.68,99.21,PAAS固化土养护7 d后抗压强度可达到368.4 kPa,减小了试样土膨胀率及降低了冻融循环作用对固化土的影响。

In order to study the organic polymer soil curing agents with strong stability,economic and environmental protection,and good water resistance,acrylic acid(AA),butyl acrylate(BA),styrene(St)were selected as the functional monomers,and graft copolymerization was carried out with sodium lignosulphonate(SLS),and the reactive emulsifiers ANPEO10 and DNS-86 were used to enhance the emulsification efficiency and stability,and the pre-emulsification semi-continuous dosing and seed emulsion methods were adopted for the grafting reaction.A new type of polymer emulsion soil curing agent PAAB and PAAS was produced by grafting reaction using pre-emulsification semi-continuous charging method and seed emulsion method,and its structure was characterized and performance tested.The results show that the polymer emulsion performance is stable TSI are less than 0.2;added to the cured soil,its crosslinked mesh structure encapsulates the soil particles,the functional groups in the emulsion and the soil cation bonding,the formation of gel substances,cured soil/water surface contact angle can reach 91.68,99.21,PAAS cured soil after seven days of maintenance compressive strength of 368.4 kPa,reducing the sample soil expansion and the effect of freeze-thaw cycle on cured soil was reduced.