Construction and Maintenance of Refractory Plastics

Fire-resistant plastic is made of 70-80% granular and powdery materials, plus 10-25% plastic clay and other binders and an appropriate amount of plasticizer. Through adjustment, it can maintain high plasticity within a corresponding period, but the fire-resistant plastic The construction and maintenance of refractory plastics must be carried out according to certain standards. Today I will give you a brief introduction to the construction, maintenance, and baking requirements of refractory plastics.

Fire-resistant plastic construction

1. Mixing: The plastic must be mixed with a forced mixer with a speed of not less than 26 rpm. Dry mix for 2-3 minutes, and then add clean water. The amount of water should be added according to the water-adding range requirements of different brands. Ensure that it is easy to mix. Under the best construction performance, the less water is used, the better. After adding water, stir for no less than 5 minutes until uniform. The mixed materials should be used up within half an hour. If there is any material that has initially been set and dried, it should not be used again. used, should be scrapped.

2. Pouring and vibration molding: The material should be vibrated while the cloth is being spread, and the operation should be continuous. Pour to the required thickness simultaneously without stopping in the middle to avoid delamination. When using a vibrator to vibrate, the material layer should be inserted slowly, and the material layer should be moved continuously and gradually. Pull it out to prevent holes and vibration leakage. The vibrating rod must not collide with the formwork, anchors, and insulation layer. Generally, it vibrates continuously for more than two times until the surface is slurried, the exhaust gas is less, and it does not settle.

Maintenance and baking requirements for refractory plastics

1. Maintenance: Plastic construction can be demoulded after hardening for 24 hours and can be naturally cured. Watering is strictly prohibited during the curing process, and the pouring body must not be subject to vibration and impact. The appropriate curing temperature is 15-30°C, lower than 15°C. Heating measures should be adopted, and the total curing time should be no less than 3 days.

2. Baking: Baking is a key link to improve the service life of furnaces and thermal equipment. Its main function is to eliminate free water and chemically bound water in the lining and obtain high-temperature performance. Improper baking will result in poor water removal. Uneven heating of the baking will cause cracks in the lining, reduce the strength, and in serious cases may even cause large pieces of the lining to peel off or explode. Baking must be carried out according to the baking system.