Can pre-gelatinized starch be used for casting lost foam coating?

In China, the modified material starch a starch was gradually used in the foundry industry after the 1970s, followed by the birth of high-density wet sand molds in China. This type of starch is called a starch (it is the correct melting of starch water under heating conditions). The water-soluble product obtained after the treatment is used in the green sand mold, its purpose is to improve its wet compressive strength, wet-heat tensile compressive strength, etc. To further improve the application performance of starch to meet the new requirements of casting production It is in this kind of situation that through repeated scrutiny experimentation, people have developed designed this kind of new modified material starch that can meet the requirements of casting production manufacturing, used it in wet sand mold sodium silicate sand, obtained exciting results. The actual effect.

1. It can improve the wet-heat tensile compressive strength of the sand mold, improve the toughness of the sand mold the smoothness of the surface layer of the steel casting model. The alpha starch on the surface of the sand mold will cause gaps after being ignited by heat, which can alleviate the thermal deformation of silica sand. Therefore, the anti-sand inclusion level of the sand mold is further improved.

 2. It can reduce the resistance of the wear difference between the sand mold the shape, improve the mold release of the sand mold, reduce the mold waste rate that often occurs based on poor mold ejection, effectively reduce some of the defects that often occur in castings.

3. If the green sand mold is placed for a period of time before the mold is closed, the surface layer of the sand mold loses water the compressive strength of the surface layer decreases is easy to wear. It is easy to be eroded when the molten metal is poured. The situation is more serious when placed for a long time when the weather is dry. The addition of Jiahe Alpha Starch to the sand mold can improve the anti-drying level of the sand mold reduce some defects in the sand washing of steel castings.
4. This product can significantly reduce the sensitivity of sand molds to moisture, reduce the water content of sand molds improve the firmness of sand molds. If the water content of the sand mold is low during sand mixing, it will appear rather dry hard brittle. Add a small amount of this product to the sand mold, the sand mold becomes flexible easy to use for modeling.

 5. Reduce the high temperature compressive strength of the sand mold, thereby improving the falling sand performance of the sand mold Product index Exterior Yellow powder Swelling degree 60 Moisture ≤8% Viscosity 75 Ash ≤0.4% Granularity (80 mesh pass) ≥95% Instructions for use dosage Because cast iron usually uses recycled sand, cast steel usually uses brand new cotton sand, the amount of this product added in the sand mold is different in iron steel castings. Cast iron :generally does exceed 0.5% (0.1-0.5%) 

Steel casting :generally does exceed 1% (0.5-1%) 

Packing: packed in colorful bags lined with plastic film bags, net weight 25kg per bag. Paper plastic meet the standard, with inner film packaging 25KG/bag Thick woven bag 1000KG/bag 3 paper mold kraft paper bag valve pocket 50 lbs/bag 25 KG/bag Transportation: It can be transported by various means of transportation, always kept dry, equipped with rain cover, waterproof material, moisture-proof equipment; it cannot be mixed with other goods that are poisonous, harmful, have abnormal smells; rain water are prohibited his filthy tarnish.