共聚改性轻度支化聚乙烯醇的结构及降滤失性研究

Investigation of Copolymerization Modification of Lightly Branched Polyvinyl Alcohol and Fluid Loss Additive property

张敬宇 韩海峰 张军华

ZHANG Jingyu HAN Haifeng ZHANG Junhua

为了在保证共聚改性轻度支化聚乙烯醇降滤失性（固井水泥失水剂）的同时不降低其溶解性，通过在醋酸乙烯聚合时引入少量甲基丙烯酸烯丙酯（AMA）双官能度单体和丙烯酸（AA）和丙烯酸丁酯（BA）合成了支化聚乙烯醇B-PVA。通过红外光谱（IR）仪、核磁共振氢谱（1H-NMR）仪及示差扫描量热分析（DSC）仪分析了合成B-PVA的结构，并考察了B-PVA的溶解性及降滤失性能。IR 和1H-NMR分析表明所合成的产物B-PVA即为目标产物；DSC分析表明B-PVA的熔点较普通1799 低，这归结于共聚单体的引入一定程度上阻碍了聚乙烯醇羟基之间的氢键作用。所合成的支化聚乙烯醇B-PVA的溶解性与普通1799 的相当，但降滤失性能明显优于普通1799的，在同等条件下，当温度从70℃增至90℃时，加有普通1799 水泥浆的滤失量由30 mL 骤增至400 mL；加有B-PVA水泥浆的滤失量仅由36 mL增至70 mL。该聚合物可望在油田降滤失剂方面获得应用。图3 表1 参14

In order to maintain the fluid loss additive properties and the solubility at the same time，allyl methacrylate，acrylic acid， butyl acrylate were introduced during the vinyl acetate copolymerization process，a lightly branched polyvinyl alcohol（B-PVA）was prepared. The structure of B-PVA was characterized by FTIR，1H-NMR and DSC，and the solubility and the filtration-reducing ability of the B-PBA were investigated. FTIR and 1H-NMR spectra analysis proved that the structure of B-PVA was in accord with that of the object product，and the DSC results showed that the melting point of B-PVA was lower than that of PVA 1799，because the introduction of copolymerization units prevented the hydrogen interaction between hydroxyl groups in some extent. The B-PVA had the same solubility as PVA 1799；however，the B-PVA had a better filtration-reducing property compared to that of PVA 1799. Under the same condition，when the temperature raised up from 70℃ to 90℃，the filtrate loss of the slurry with PVA 1799 increased dramatically from 30 mL to 400 mL；However，the filtrate loss of the slurry with B-PVA only increased from 36 mL to 70 mL. The polymer B-PVA has potential use in oil exploitation.

10.19346/j.cnki.1000-4092.2016.03.003