木质素磺酸钠的改性及应用研究

STUDY ON MODIFIED SODIUM LIGNOSULPHONATE AND ITS APPLICATION

采用超滤分级的方法筛选出相对分子质量在5 000～10 000的木质素磺酸钠,对其进行了丙烯酸接枝聚合.通过傅立叶红外光谱分析(FTIR)对其结构进行了表征,并测定了其表面张力、接触角以及进行了水煤浆性能测试.实验表明,与木质素磺酸钠相比,接枝聚合产物LA能更有效地降低表面张力,接触角θLA<θ木质素磺酸钠,应用于水煤浆(CWS)添加剂可使黏度降低100mPa.s～300mPa.s,与萘磺酸钠作添加剂的水煤浆黏度相当,水煤浆的静态稳定性也明显增强.

The sodium lignosulphonate was fractionated by means of ultrafiltration, and the grafted copolymer was prepared by using the 5 000-10 000 fraction and acrylic acid. The structure of the products was characterized by FTIR, and surface tension, contact angle and the properties of coal water slurry （CWS） were examined. The results showed that. the grafted co- polymer（LA） was more available to decrease the surface tension, and the contact angle of LA was less than that of sodium lignosulphonate. When the grafter was used in additives for CWS, the CWS viscosity could be reduced 100 mPa · s to 300 mPa · s which was equal to sodium naphtha- lene sulfonate and it could give a better static stability.