干压成型制备无机聚合物实验研究

Research of Inorganic-Polymer Made by Dry Pressing

无机聚合物是一种性能优良的工程材料,目前主要采用浇注成型方式制备。首次采用干压成型方法制备了无机聚合物材料,结果表明,干压成型方法是可行的,在1d到28d龄期内,样品抗压强度明显提高。干压成型无机聚合物材料样品在1、3、7和28d的抗压强度分别可以达到100、120、140和180MPa,明显优于浇注成型的样品。两种成型方式由于需水量不同,引起了材料反应机理的差别,干压成型样品中生成了莫来石晶体相,有利于强度提高。材料制备过程中,成型压力、样品含水量对无机聚合物材料抗压强度影响有交互作用,两者有一最佳值:样品含水量13.1%,成型压力90MPa时,1d抗压强度达到60MPa。样品中碱含量在5.5%以上时样品抗压强度较高;水玻璃量(15.5%～19.3%)变化对材料抗压强度影响不大;矿渣对无机聚合物材料强度影响很大,矿渣含量增加,材料强度升高。

Inorganic-polymer was first made by dry-press process which was proved to be feasible. The compressive strength of it was improved greatly from 1 d to 28 d. The compressive strength of samples was 100, 120, 140 and 180 MPa respectively at 1, 3, 7 and 28 d, which distinctly than that of samples made by casting process. There were two different reactive mechanism in the two formation processes due to the required water content. The mullite was formed in the samples made by dry-press process, which is benefit to the strength. The compressive strength of the inorganic-polymer materials was influenced by press and the percentage of water, both of which had interaction. The optimal values of them were 13.1% water and 90 MPa press respectively. As a result, the compressive strength of it is 60 MPa for 1 d. When the percentage of sodium hydroxide is higher than 5.5%, the compressive strength is higher than others. The percentage of water-glass in sample from 15.5% to 19.3% has little influence on the compressive strength of the samples. The compressive strength of the samples was influenced intensively by slag, with the percentage of slag increasing, the compressive strength of sample was increased too.