改性纳米碳酸钙粉体的制备及其耐酸性_丁士育

第33卷第3期硅酸盐学报Vol.33,No.3 2005年3月JOU RNAL OF T HE CHINESE CERAM IC SOCIET Y March,2005

改性纳米碳酸钙粉体的制备及其耐酸性

丁士育1,金鑫1,陈欣2,3

(1.北京化工大学,可控化学反应科学与技术基础教育部重点实验室,北京100029; 2.中国建筑一局集团第三

建筑公司,北京100073; 3.北京建筑工程学院继续教育学院,北京100044)

摘要:在共沸蒸馏脱水后的纳米碳酸钙正丁醇悬浮液中直接加入硬脂酸,制备了改性纳米碳酸钙粉体,确定了改性剂硬脂酸的最佳用量为纳米碳酸钙质量的3%。每100g改性纳米碳酸钙的吸油值为49.4g,活化度高达99.9%,比表面积为30.32m2/g。用透射电镜,红外光谱分析, BET(Brunauer Emmett Teller)法等对改性纳米碳酸钙进行了表征。研究了改性纳米碳酸钙的耐酸的和耐酸性原因,即粒子表面形成的有机包敷层,使碳酸钙产生了一定的耐酸性能。

关键词:纳米碳酸钙;表面改性;制备;耐酸

中图分类号:T Q132.3+2文献标识码:A文章编号:04545648(2005)03035004

PREPARATION OF MODIFIED NANO-SIZED C ALCIUM CARBONATE

POW DERS AND ITS ACID RESISTANCE

D I N G Shiy u1,J I N X in1,CH EN X in2,3

(1.T he K ey L abor ator y of Science and T echno log y o f Contro llable Chemical React ions,M inist ry o f Education,Beijing

U niver sity o f Chemical T echnolog y,Beijing100029; 2.No.3Co nstr uction Co mpany,China Co nstr uctio n

First Div isio n G roup,Beijing100073; 3.Institute of A dult Continuing Educatio n,Beijing Institute of

Civil Engineering and A rchitecture,Beijing100044,China)

Abstract:N ano-sized calcium carbonate made from liquid carbonates was treated by azeotropic distillation,and mo dified nano-sized ca-l cium carbonate was prepared by a new technology o f adding stearic acid into calcium carbonate n butanol suspension.Results show that the optimal amount of modifying reag ent is3%in mass,the absorption oil value of per100g modified calcium carbonate is49.4g, active ratio is up to99.9%,and specific surface area is30.32m2/g.T he modified calcium carbonate was characterized by transmission electron micr oscope,Fourier transform infr ared spectrosco py and Brunauer Emmett T eller method.T he r easo n fo r the acid re-sistance o f nano-sized ca lcium car bo nate obtaincd after modificat ion w as inv est igated.It is co nsidered as the o rg anic layer coated on the surface of part icles.

Key words:nano-sized calcium car bo nate;sur face mo dification;pr epar atio n;acid r esistance

纳米碳酸钙作为一种重要的无机化工产品,被广泛应用在塑料、涂料、造纸、橡胶等行业,然而纳米碳酸钙也有耐酸性差、表面强度小等缺点。另外,碳酸钙表面亲水疏油,呈强极性,因而在有机介质中分散性差、与有机物质间结合力弱。而且,由于纳米碳酸钙粒子的表面能高,极易聚集成大颗粒,形成二次

收稿日期:20040608。修改稿收到日期:20041222。

第一作者:丁士育(1979~),男,硕士研究生。

通讯作者:金鑫(1961~),男,副教授。粒子,使得粒径大于100nm,从而影响纳米颗粒的实际应用效果。此外,碳酸钙作为填料,由于其不耐酸性,即在酸性介质下易于分解,从而限制了它在酸法造纸、外墙涂料等多方面的应用。为此,国外进行了大量研究以开发耐酸碳酸钙产品,并有许多专利成果发表。张素芳等[1]对国外的专利归纳后,将

Received date:20040608.Approved date:20041222.

F irst au th or:D IN

G Shiyu(1979)),male,graduate student for master degree. Correspondent au thor:JIN Xin(1961)),male,associate profess or.

jinxin@m ail.b