Potassium hydroxide is widely used in chemical industry because of its strong alkalinity and corrosiveness. It can also be used as a variety of reagents in different fields, such as desiccant, absorbent, refractory adhesive, etc. So, let's take a look at the preparation method of its refractory adhesive.

1.耐火膠粘劑的研制

1. Development of refractory adhesive

①耐火液體的制備方法：在反應(yīng)罐中依次加入8kg粒狀氫氧化鉀、7kg粉狀碳酸鈉（純堿）（朝日硝酸鹽公司生產(chǎn)）、30kg金屬硅化物，再加入60L水。在反應(yīng)罐中，自然反應(yīng)開(kāi)始，劇烈反應(yīng)從下部產(chǎn)物開(kāi)始，對(duì)流從下部向上部發(fā)生。當(dāng)反應(yīng)溫度在80℃～90℃之間時(shí)，反應(yīng)活躍。反應(yīng)溫度不高于92℃。通過(guò)分離固體可獲得約48l（70kg）的難熔液體。

① Preparation method of refractory liquid: 8kg granular potassium hydroxide, 7kg powdered sodium carbonate (soda) (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 is not higher than 92 ℃. About 48l (70kg) of refractory liquid can be obtained by solid separation.

殘余固體為金屬硅化物。如果用水清洗，大約22公斤的金屬硅化物殘留。在該殘余金屬硅化物塊中，添加約8kg的金屬硅化物塊，并且金屬硅化物的總量為30kg，其被供應(yīng)給二次反應(yīng)。

The residual solid is metal silicide. If washed with water, about 22 kg of metal silicide remains. In the residual metal silicide block, about 8 kg of metal silicide block is added, and the total amount of metal silicide is 30 kg, which is supplied to the secondary reaction.

與剛開(kāi)始的反應(yīng)相同，向反應(yīng)罐中加入8kg粒狀碳酸鈉和7kg粉狀碳酸鈉（純堿）（旭硝子公司生產(chǎn)），然后依次加入22kg殘余金屬硅化物塊和8kg新的金屬硅化物塊，加水60L，開(kāi)始制備耐火液體的二次反應(yīng)。在制備過(guò)程中，按照先加入顆粒狀氫氧化鉀，再加入粉狀碳酸鈉（純堿），再加入金屬硅化物塊，再加水的順序，反應(yīng)從較低的產(chǎn)物開(kāi)始，形成上下對(duì)流型活性反應(yīng)，因此制備的耐火液體具有較好的性能。

Similar to the initial reaction, 8kg granular sodium carbonate and 7kg powdered sodium carbonate (soda) (produced by Xuni subsidiary) were added to the reaction tank, then 22kg residual metal silicide block and 8kg new metal silicide block were added in turn, and 60L water was added to start the secondary reaction of preparing refractory liquid. In the preparation process, according to the order of adding granular potassium hydroxide, then adding powdered sodium carbonate (soda), then adding metal silicide block, and then adding water, the reaction starts from the lower product, forming the up-down convection type active reaction, so the prepared refractory liquid has better performance.

②耐火膠的制備：向反應(yīng)罐中分別加入耐火液、切舊報(bào)紙（也可使用其他舊報(bào)紙）、稻殼和棉花，攪拌均勻，制成耐火材料。

② Preparation of refractory adhesive: add refractory liquid, cut old newspaper (other old newspaper can also be used), rice husk and cotton into the reaction tank, mix them evenly to make refractory material.

2.如果涂有耐火液體，則涂有耐火液體的紙板在接近1000℃的火焰下燃燒30分鐘不會(huì)燃燒。將耐火膠黏劑混合物加壓脫水含水量45%，在180℃加壓1h制備輕質(zhì)耐火材料。耐火材料在1500℃下觀察30分鐘。10分鐘后，耐火材料表面玻璃化。燃燒30分鐘后，耐火材料被切割。玻璃化深度只有0.8毫米，火沒(méi)有進(jìn)入耐火材料。此外，耐火材料具有良好的隔音和抗沖擊性能。它能切割、鋸、釘、螺絲等加工性能與木材相似。

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