Rongsheng Refractory Plastic Manufacturer

Refractory plastic is composed of refractory (bauxite) aggregate and refractory powder, mixed in proportion, adding binders such as plastic white mud or clay and an appropriate amount of plasticizer. It is an unshaped refractory material that is in the form of bulk material or paste and maintains high plasticity for a long time.

Classification of refractory plastics: According to the types of refractory aggregates, they are divided into clay, high alumina, mullite corundum, chromium, silicon carbide, and zirconium. According to the type of binder, it is divided into composite binders such as raw clay and aluminum sulfate, phosphoric acid, phosphate, water glass, and resin. According to the normal temperature hardening properties, it is divided into air-hardening and thermosetting refractory plastics.

RS High Alumina Plastic Refractory

Refractory Plastic Properties

To ensure normal use at high temperatures and smooth construction, refractory plastics should have the following basic characteristics:

1. It has a shelf life of construction time to ensure that the molding performance remains unchanged during the specified storage period.

2. It has good plasticity for easy construction.

3. It has good strength after curing at room temperature so that the frame can be dismantled after construction.

4. It has good high-temperature volume stability to prevent damage to the furnace lining structure due to excessive deformation.

Applications of Refractory Plastics

Refractory plastics are mainly used in the linings and maintenance of furnaces, cyclones, superheaters, flues, etc. of various power station boilers, and in the linings of heating furnace roofs, water-cooled walls, etc. Materials can be divided into high aluminum, clay, corundum, corundum silicon carbide, silicon, magnesia, chromium, etc. According to the classification of binders, there are white mud binders, aluminum phosphate binders, water glass binders, sulfate binders, aluminate binders, etc.

Advantages of Rongsheng Refractory Plastics

Application Advantages of Rongsheng Refractory Plastics

The characteristic of refractory plastic is that it can be constructed into any shape and the construction period is short. It can be constructed by ramming, or it can be repaired according to the damaged location. Moreover, it can be put into use directly according to the furnace temperature without baking. It is a good repair material.

Fire-resistant plastic has good wear resistance, strong plasticity, and good bonding properties. It is mostly used in circulating fluidized bed boilers or heating furnaces. Plastics can be produced in many forms during the production process. If the construction is to be put into use immediately, one-third of the cementing material can be added during production. Trapped materials first, go to the construction site and add the other two-thirds of the PA80 glue, and then the construction can be started. You can also add all the glue into the material, but the packaging must be scientific. Open the plastic packaging at the construction site and put it into use.

The raw material of refractory plastic can be corundum, burnt gemstone, or high-aluminum aggregate. It can be made into plastics of different grades and qualities. However, the cementing material used must be PA80 glue. Glue is made by boiling aluminum dihydrogen phosphate and phosphoric acid. It can be added first or on-site. If it is added on-site, there still needs to be a process of trapping the material to achieve the best results.

Different grades of refractory plastics are determined according to the furnace lining atmosphere, temperature, and wear resistance of the used parts. If the temperature is low, materials suitable for the temperature can be made and produced, and the price is relatively cheap. If the temperature is high or too high, corundum or even zirconium corundum must be used to make it meet the needs of the furnace lining.

The function of refractory plastic is that it has strong plasticity and can be used on the stovetop. It can also be used for pounding on the furnace wall.

To purchase high-quality refractory materials and refractory plastic products, please contact us. Get free samples and quotes.

How to Construct Refractory Plastics to Achieve Zero Expansion

The fire-resistant plastic can be constructed conveniently and quickly, and the state of use is stable. If you want the plastic to achieve zero expansion, you need to adopt a zero-expansion design to offset the expansion and contraction of the plastic at high temperatures.

The plastic has a certain degree of plasticity when the temperature is high, and the zero expansion of the plastic is that it can withstand the drastic changes of the furnace temperature and resist frequent shutdown and heating. The mold can be dismantled immediately after plastic construction. If it is maintenance, no oven is needed, and it can be put into use directly as the furnace temperature rises.

The Construction of Plastic Refractory

However, during construction, attention should be paid to drawing-form construction to ensure that the deformation of the steel structure and the lining furnace are synchronized. In addition, the anchoring brick must be evenly stressed, so as to avoid breakage and roof collapse during use.

The zero-expansion design is to support the mold first during construction to ensure that the construction site is clean. Then lay refractory plastic blanks on the rammed part. Only a single layer of material can be laid each time with the hammerhead down, moving and overlapping back and forth to make the plastic smooth and compact. If the anchor brick is constructed, the refractory plastic ramming surface must be 16-20mm higher than the bottom surface of the anchor brick. Put a wooden mold on the anchor brick, straighten it and hammer out tooth marks. The plastic around the anchor bricks should be rammed and compacted.

Refractory plastic construction should be laid out and rammed layer by layer, and each layer should be shaved and kept at the same height as the construction surface. In case of intermittent plastic ramming, use a plastic sheet to cover the rammed surface. If it is snowing, shave the material surface. When the construction is interrupted for a long time, the joint should be left between the two rows of anchor bricks.

If the plastic is used on the top of the furnace, the force direction of the hammerhead should be level when ramming. The seam of the material surface and the working surface of the furnace top should be vertical, and the peeling layer must not overlap with the seam of the material surface during the production process. The plastic material should be rammed from the seam of the blank on the top of the furnace. When the construction is intermittent, cut the material vertical furnace shell into right angles and cover it with a plastic sheet to prevent water loss. Before using anchoring bricks or hanging bricks, the wooden mold bricks with the same tooth shape should be used to tighten and drive into plastics to form a tooth mark, and then the anchor bricks are embedded and fixed tightly.

Dismantle the mold as soon as possible after the plastic construction to disperse the water. When trimming, lightly beat the plastic around the end face of the anchor brick with a wooden hammer or a ramming hammer to make it tightly bite. Trimming includes shaving, piercing vents, or cutting expansion joints.

During construction, the refractory plastic can not be in contact with water. When constructing the castable in contact with the plastic, it is also necessary to make the plastic waterproof. The mold should be dismantled as soon as possible before drying to make the masonry dry naturally.

Due to the "zero expansion" design of refractory plastics, the masonry is filled with refractory fibers at the cracks and expansions after drying and baking to prevent the lining from venting and smoking at low temperatures. The cracks and expansion joints will close at about 1350℃.

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