不同侧链长度聚羧酸分散剂的合成与性能-研究

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1、聚羧酸盐水煤浆分散剂的侧链长度。本文得出SAS瓜压AA／APEGlOoo分散剂和SAS／MAA／MPEGMAA750分散剂，在浆体中的最佳用量都为煤含量的0．4％，水煤浆最高制浆浓度分别为72％和68％，煤粒表面的Zeta电位由．17．8mv分别变化到．56．2mv禾l：1．53．1mv，并与常用聚羧酸盐分散剂和己工业化的萘磺酸盐分散剂比较，两种分散剂性能明显提高，水煤浆在7d内的吸水率都降低，甚至SAS／MAMAPEGl000的吸水率达到2．16％，提高了稳定性和流变特性，具有良好的润湿和吸附效果。通过对SASMAA瓜伊EG心750分散剂进行X射

2、线光电子能谱(xps)分析，最后，得出煤粒表面吸附分散剂后的吸附层厚度达到了6．12rim。得到性能较佳的侧链长度为SAS／MAMAPEGl000禾1：ISAS瓜压AA／ⅧEGMAA750的聚羧酸盐水煤浆分散剂，对彬长煤具有更好的降粘、分散和稳定作用。关键词：水煤浆，聚羧酸系，甲基丙烯酸，分散剂，侧链长度SYNTHESISANDPROPER耵ESoFPoLYCARBoXYLATEDISPERSANTS、ⅥTHDIFFERENTSIDECHAINLENGTHABSTRACTCWS(coalwaterslurry)hasgainedwidespread

3、concernasanimportanttechnologyforcoalprocessingandutilization，andthedispersantsplayedcriticalrolesinpreparingCWSofhigh-quality．ShaanxiBinchangcoalisakindofcoalwithrelativelyhigheroxygen／carbonratioandintemalwaterconcentration，thusit'SquitedifficulttopreparetheCWSwithhighconcen

4、tration．Soithaspracticalsignificancetoresearchthes呻abilityofCWS．ResearchshowedthatthepolycarboxylatedispersantofCWShasgooddispersionproperties，whichwiththestructuralunitforpolyethyleneglycolHowever，theeffectivesidechainlengthonperformancehasnotbeensmdbdsystemly．Onthisbasis，two

5、kindsofpolycarboxylatedispersantofCWSwithdifferentsidechainlengthweresynthesizedinthispaper．Weresearchedtheeffectivedispersantofside-chainstructureonthepulpproperties．SelectedthedispersantwithsidechainlengthwhiChwouldperformbetter，ithaspracticalsignificancetopolycarboxylatedis

6、persantinapplication．Inthispaper，allylsulfonate／methacrylicacid／allylpolyethyleneglycol(SAS／MAA／APEG)polycarboxylatedispersantwithdifferentsidechainlengthweresynthesizedbypolymerizationdirectly．Polyethyleneglycolallyl(therelativemolecularofAPEGare700，1000，1200，2400respectively

7、)withfourkindsofsidechainlength，methacrylicacid(MAn)andallylsulfonate(SAS)asmonomers．Allylsulfonate／methacrylicacid／methacrylicacidesterofmethoxypolyethyleneglycol(SAS／MAA／MPEGMAA)polycarboxylatedispersantwithdifferentsidechainlengthweresynthesized．Methoxypolyethyleneglycol(th

8、erelativemolecularofMPEGare350，500，750，1000respectively)with4