采用羧甲基纤维素与甲基丙烯酸甲酯的接枝共聚物(CMC-g-PMMA)作为改性剂对稻壳碎料进行表面处理,制成不同稻壳碎料含量的稻壳碎料-水泥复合材料(RHPC)。对RHPC复合材料的密度、抗折性能、断面表面形貌、吸声性能、保温性能和燃烧性能进行测试和分析。结果表明:添加CMC-g-PMMA可大幅度提高RHPC复合材料的抗折强度和模量,当稻壳碎料含量为20%,CMC-g-PMMA添加量为1%时,抗折强度和模量分别为未添加助剂试样的2.27和2.71倍; 声波频率为2 000 Hz以下,提高稻壳碎料含量后,水泥复合材料的吸声系数明显提高,1 000 Hz时,稻壳碎料含量为40%的试样的吸声系数高达0.67; 制备的稻壳碎料-水泥复合材料为不燃性材料,具有良好的保温性能。
Rice hull particle-cement composites(RHPC)were prepared from rice hull particles treated with the synthesized carboxymethylcellulose methyl methacrylate(CMC-g-PMMA).The density, flexural property, surface topography, acoustics property, thermal insulation and fire retardant property of the RHPC composites were characterized. Results indicated that the samples made from CMC-g-PMMA modified rice hull particles had higher flexural strength and flexural modulus. When the content of rice hull particles was 20% and the content of CMC-g-PMMA was 1%, the value of flexural strength and flexural modulus of the composites changed respectively to 2.27 times and 2.71 times of the value of the sample contained 20% rice hull particles only. The acoustic absorptivity of the samples rose with increasing rice hull particles content when the testing frequency was below 2 000 Hz. The acoustic absorptivity of the samples with 40% rice hull particles was 0.67 at 1 000 Hz. RHPC composites are incombustible and well thermal insulated.
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