一、发展概况早在18世纪40年代,人们使用植物纤维和动物毛类做保温材料。到19世纪70年代硅藻土、矿纤等材料得到应用。到20世纪50年代,保温材料需求量剧增,硅酸盐、泡沫混凝土、泡沫塑料等新型保温材料相继问世。目前,对保温材料提出了更高的要求,人们千方百计地寻求最佳容重、最佳导热系数和高效能廉价的保温材料。二、造型土珍珠岩造型土珍珠岩是属于膨胀珍珠岩的超轻质保温材料之一。膨胀珍珠岩具有容重轻、导热系数低、化学稳定性好、使用温度范围广、吸湿能力小、防火、无毒、无味、吸音等性能。为了运输、施工方便,常常根据工程需要预制成不同形状的块体或板材。造型土珍珠岩就是用 I. Development Overview As early as the 1840s, people used plant fibers and animal hair as insulation materials. By the 1870s, diatomite, mineral fiber and other materials were applied. By the 1950s, the demand for heat-insulating materials soared, and new types of heat-insulating materials such as silicates, foamed concrete, and foamed plastics came out one after another. At present, higher requirements are placed on the heat-insulating materials, and people seek every possible means to find the best bulk density, the best thermal conductivity, and the high-efficiency, low-cost insulation materials. Second, modeling soil perlite Modeling soil perlite is one of the ultra-lightweight thermal insulation materials belonging to expanded perlite. Expanded perlite has the properties of light weight, low thermal conductivity, good chemical stability, wide temperature range, small moisture absorption capacity, fire resistance, non-toxicity, tastelessness, and sound absorption. For the convenience of transportation and construction, blocks or plates of different shapes are often prefabricated according to engineering requirements. Modeling earth perlite is used