纤维改性硫氧镁基仿木保温材料性能研究

为了提高硫氧镁基仿木保温材料的各项性能, 分别研究了相同长度的聚丙烯纤维(PPF)、聚乙烯醇纤维(PVAF)、玻璃纤维(GF)对其性能的影响. 结果表明: 随着纤维掺量的增加, 硫氧镁基仿木保温材料的流动性有所降低; GF对其抗压抗折强度的提高效果最明显, 其中GF掺量为1.0 kg·m^-3时早期抗压强度最高, PVAF掺量为0.5 kg·m^-3时其早期抗压强度最高; PPF明显提高了硫氧镁基仿木保温材料的耐水性, 其掺量为0.5 kg·m^-3时软化系数最大, 而GF掺量在1.0 kg·m^-3时, 浸水软化系数稍高于未加纤维的对比试件; 掺加PVAF后硫氧镁基保温材料的导热系数出现一定程度的降低, 其中PVAF掺量在1.5 kg·m^-3时其导热系数最低. GF和PPF可以明显地降低硫氧镁基仿木保温材料的收缩值, 其中GF降低自收缩效果较好, 而PPF可以明显地降低其干燥收缩值.

Properties of fiber modified magnesium oxysulfate based wood-like thermal insulation material

In order to improve the properties of magnesium oxy sulfate based wood-like thermal insulation materials, the effects of fiber modification with polypropylene fiber (PPF), polyvinyl alcohol fiber (PVAF) and glass fiber (GF) in same length were studied in this paper. The results show that the fluidity of magnesium oxy sulfate cement based wood-like thermal insulation material decreases with the increase of fiber content; GF has the most obvious effect on the improvement of its compressive and flexural strength; the early compressive strength is the highest when the content of GF is 1.0 kg·m^-3, and it is the highest when the content of PVAF is 0.5 kg·m^-3; PPF obviously improves the water resistance of magnesium oxy sulfate cement based wood-like thermal insulation material. The softening coefficient of wood-like thermal insulation material is the highest when the content of PPF is 0.5 kg·m^-3, and it is slightly higher than that of the unfibered comparative test piece when the content of GF is 1.0 kg·m^-3. The thermal conductivity of wood-like thermal insulation material decreases to a certain extent, which is the lowest when the content of PVAF is 1.5 kg·m^-3. The results also show that GF and PPF can obviously reduce the shrinkage value of magnesium oxy sulfate based thermal insulation materials. GF reduces the auto-shrinkage better, while PPF significantly reduces the drying shrinkage value.