Gypsum-based steel structure fireproof coating interface agent and preparation method thereof

The invention discloses a gypsum-based steel structure fireproof coating interface agent and a preparation method thereof. The gypsum-based steel structure fireproof coating interface agent comprises the following raw materials in parts by weight: 10-45 parts of redispersible latex powder, 0-35 parts of silica powder, 4-22 parts of gypsum and 0.1-0.5 part of a powdery defoaming agent. A flexible interface layer is formed between the surface of a steel structure and the gypsum-based steel structure fireproof coating, the interface agent has good binding force with steel and gypsum, the interface agent has good ductility at normal temperature after film forming, and the bonding performance of the gypsum-based thick fireproof coating can be improved through relaxation stress. 本发明公开了一种石膏基钢结构防火涂料界面剂及其制备方法。该石膏基钢结构防火涂料界面剂，按重量份计，其原料包括：可再分散性乳胶粉10～45份、硅微粉0～35份、石膏4～22份、粉状消泡剂0.1～0.5份。本发明在钢结构表面与石膏基钢结构防火涂料之间形成一层柔性界面层，界面剂与钢材和石膏两种材料都有良好的结合力，界面剂成膜后在常温下具有良好的延展性，可通过松弛应力提高石膏基厚质防火涂层的粘接性能。