Fireproof expansion sealing piece and preparation method thereof

The invention relates to the technical field of building outer window accessories, in particular to a fireproof expansion sealing piece and a preparation method thereof. The fireproof expansion sealing piece comprises the following raw materials in parts by weight: 1-10 parts of a rare earth stabilizer, 1-5 parts of stearic acid, 5-15 parts of activated calcium carbonate, 15-30 parts of dioctyl phthalate, 15-30 parts of graphite and 20-25 parts of polyvinyl chloride resin. The fireproof expansion sealing element composition product produced by the extrusion process has the advantages of excellent and uniform expansibility, good appearance, high production efficiency, low rejection rate and the like, and better guarantee is provided for meeting the fireproof integrity of external windows of buildings. 本发明涉及建筑物外窗配件技术领域，具体涉及一种防火膨胀密封件及其制备方法。包括以下原料的重量份数，稀土稳定剂1份～10份、硬脂酸1份～5份、活性碳酸钙5份～15份、邻苯二甲酸二辛酯15份～30份、石墨15份～30份、聚氯乙烯树脂20份～25份。本挤出工艺生产的这种防火膨胀密封件组合物产品具有优良的均匀的膨胀性，且外观好，生产效率高，废品率低等优点，为满足建筑外窗的耐火完整性能得到更好的保障。