Potassium hydroxide has important applications in chemical industry because of its strong alkalinity and corrosivity. It can also be used as various reagents in different fields, such as desiccant, absorbent, fire-resistant adhesive and so on. Then, let's take a look at the preparation method of its refractory adhesive.

1.耐火胶粘剂的研制

1. Development of refractory adhesive

①耐火液体的制备方法：在反应罐中依次加入8kg粒状氢氧化钾、7kg粉状碳酸钠（纯碱）（朝日硝酸盐公司生产）、30kg金属硅化物，再加入60L水。在反应罐中，自然反应开始，剧烈反应从下部产物开始，对流从下部向上部发生。当反应温度在80℃～90℃之间时，反应活跃。反应温度不高于92℃。

① Preparation method of refractory liquid: 8kg granular potassium hydroxide, 7kg powdered sodium carbonate (soda ash) (produced by Asahi nitrate company), 30kg metal silicide and 60L water are successively added into the reaction tank. In the reaction tank, the natural reaction starts, the violent reaction starts from the lower product, and the convection occurs from the lower part to the upper part. When the reaction temperature is between 80 ℃ and 90 ℃, the reaction is active. The reaction temperature shall not be higher than 92 ℃.

通过分离固体可获得约48l（70kg）的难熔液体。残余固体为金属硅化物。如果用水清洗，大约22公斤的金属硅化物残留。在该残余金属硅化物块中，添加约8kg的金属硅化物块，并且金属硅化物的总量为30kg，其被供应给二次反应。与刚开始的反应相同，向反应罐中加入8kg粒状碳酸钠和7kg粉状碳酸钠（纯碱）（旭硝子公司生产），然后依次加入22kg残余金属硅化物块和8kg新的金属硅化物块，加水60L，开始制备耐火液体的二次反应。

About 48 L (70 kg) of refractory liquid can be obtained by separating solids. The residual solid is metal silicide. If washed with water, about 22 kg of metal silicide remains. In the residual metal silicide block, about 8kg of metal silicide block is added, and the total amount of metal silicide is 30kg, which is supplied to the secondary reaction. As in the initial reaction, 8kg granular sodium carbonate and 7kg powdered sodium carbonate (soda ash) (produced by Asahi nitrate subsidiary) are added to the reaction tank, then 22kg residual metal silicide block and 8kg new metal silicide block are added successively, and 60L of water is added to start the secondary reaction of preparing refractory liquid.

在制备过程中，按照先加入颗粒状氢氧化钾，再加入粉状碳酸钠（纯碱），再加入金属硅化物块，再加水的顺序，反应从较低的产物开始，形成上下对流型活性反应，因此制备的耐火液体具有较好的性能。

In the preparation process, in the order of first adding granular potassium hydroxide, then adding powdered sodium carbonate (soda ash), then adding metal silicide block, and then adding water, the reaction starts from the lower product to form an up-down convection type active reaction. Therefore, the prepared refractory liquid has better performance.

②耐火胶的制备：向反应罐中分别加入耐火液、切旧报纸（也可使用其他旧报纸）、稻壳和棉花，搅拌均匀，制成耐火材料。

② Preparation of refractory glue: add refractory liquid, cut old newspapers (other old newspapers can also be used), rice husk and cotton into the reaction tank respectively, and stir evenly to make refractory materials.

2.如果涂有耐火液体，则涂有耐火液体的纸板在接近1000℃的火焰下燃烧30分钟不会燃烧。将耐火胶黏剂混合物加压脱水含水量45%，在180℃加压1h制备轻质耐火材料。耐火材料在1500℃下观察30分钟。10分钟后，耐火材料表面玻璃化。燃烧30分钟后，耐火材料被切割。玻璃化深度只有0.8毫米，火没有进入耐火材料。此外，耐火材料具有良好的隔音和抗冲击性能。它能切割、锯、钉、螺丝等加工性能与木材相似。

2. If coated with fire-resistant liquid, the paperboard coated with fire-resistant liquid will not burn in a flame close to 1000 ℃ for 30 minutes. The refractory adhesive mixture was pressurized and dehydrated to 45% water content, and the lightweight refractory was prepared at 180 ℃ for 1 h. The refractory was observed at 1500 ℃ for 30 minutes. After 10 minutes, the refractory surface vitrified. After burning for 30 minutes, the refractory is cut. The vitrification depth was only 0.8mm, and the fire did not enter the refractory. In addition, the refractory has good sound insulation and impact resistance. It can cut, saw, nail, screw and other processing properties similar to wood.