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Preparation and Characterization of Polyethy Leneimine Modified Diatomite
  
DOI：10.11980/j.issn.0254-508X.2017.12.009
Key Words:polyethyleneimine  diatomite  filler  characterization
Fund Project:吉林省科技发展计划项目（20140204040GX）的资助。
Author NameAffiliation
尚　尉1，2 1.东北电力大学化学工程学院，吉林吉林，132012；2.东北林业大学生物质材料科学与技术教育部重点实验室，黑龙江哈尔滨，150040 
于海辉1 1.东北电力大学化学工程学院，吉林吉林，132012 
张晓君1 1.东北电力大学化学工程学院，吉林吉林，132012 
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Abstract:Using polyethyleneimine（PEI）and sodium dodecyl sulfate as modifiers, the surface of diatomite particles was modified by impregnation method. The adsorption of diatomite to PEI was investigated. The morphology, particle size, and Zeta potential of the PEI modified diatomite filler were also determined. The influences of modified diatomite filler on filler retention, Zeta potential and drainability of furnish were studied. The results indicated that PEI was effective to modified diatomite.Compared with the unmodified diatomite, Zeta potential of the modified diatomite was changed from electronegative to electropositive.Particle size was also increased. The Zeta potential and particle size of the diatomite particles were 25.03 mV and 14.05 μm, when the equilibrium adsorption concentration of the PEI was 0.24 mg/mL. PEI modified diatomite filler can effectively improve the Zeta potential of the pulp. The filtering performance of pulp was effectively improved.
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