秸秆/氯氧镁水泥无机轻质复合材料制备与性能

以氯氧镁水泥（MOC）为主料，H₂O₂为发泡剂，MnO₂为激发剂，硬脂酸钙为稳泡剂，聚丙烯酰胺为增稠剂，添加稻秸秆，制备出秸秆/MOC无机轻质复合材料。探讨了秸秆尺寸和添加量对秸秆在浆料中的分散性及对秸秆/MOC复合材料力学强度、韧性、抗裂性、吸水性的影响规律。结果表明，秸秆尺寸和添加量对秸秆在浆料中的分散性、强度有较大影响，当秸秆尺寸≤ 250 μm、秸秆与MOC的质量比为0.9%时，秸秆分散性最好，制得秸秆/MOC复合材料的压缩强度（11.26 MPa）、弯曲强度（3.97 MPa）最大，抗裂性最佳。SEM分析表明，未经处理的秸秆与基体间的胶结状况差，存在弱界面层，当掺入秸秆尺寸过大或添加量过多时，秸秆/MOC复合材料中单位体积内被引入了较多的弱界面胶合部分，进而影响了复合材料的整体性能。

Preparation and properties of straw/magnesium oxychloride cement inorganic light mass composites

The rice straw/magnesium oxychloride cement (MOC) inorganic light composites were prepared with hydrogen peroxide solution as the foaming agent, MnO₂ as the excitation agent, calcium stearate as the stabilizing foam agent, polyacrylamide as the thickening agent. The effect of straw size and adding quantity on the dispersion of straw in the slurry and its effect on the strength, toughness, crack resistance and water absorption of straw/MOC composites were discussed. The results show that the straw size and the amount of addition have a great influence on the straw dispersion and strength of straw/MOC composites. When the straw size is smaller than 250 μm and the quantity is 0.9% mass ratio of straw to MOC, the straw dispersion is the best, the compressive strength (11.26 MPa), bending strength (3.97 MPa) and anti-crack of straw/MOC composites are the largest. SEM analysis show that there are weak layer between straw and the matrix because the poor cementing quality. When the straw size is too large or straw quantity is too much, per unit volume of the straw/MOC composites will be introduced more weak interfacial bonding part. As a result, the overall performance of the sample will be affected.