Reasons why coated sand is easy to agglomerate in summer-Jiangsu Juyang Precision Modeling Material Technology Co., Ltd.

Reasons why coated sand is easy to agglomerate in summer

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Reasons why coated sand is easy to agglomerate in summer

The process of film-coated sand is to mechanically mix powdery thermosetting phenolic resin with raw sand and solidify it when heated; then it is developed to use thermoplastic phenolic resin plus latent curing agent (Urotropine) and lubricant through a certain film. The process is formulated into coated sand. When the coated sand is heated, the resin coated on the surface of the sand particles melts. Under the action of the methylene group decomposed by the urotropine, the molten resin rapidly changes from a linear structure to an unmelted body Structure, so that the coated sand is cured.

Because it is a powder itself, in the summer, because the humidity in the air is greater than in other seasons, plus coated sand itself is a curable agent, so when the temperature in summer is high, the original powder is The coated sand is solidified again! So store it in a relatively dark and dry environment, so that the coated sand will not appear this agglomeration.

There are certain standards for judging the quality of the product. The product can only be sold and sold only after inspection, and the same is true for the coated sand. However, different products have different detection indicators. Today we mainly come to understand what are the indicators for detecting coated sand.

The indicators of coated sand can be used to determine whether the coated sand meets the characteristics of bending resistance, compression resistance, and high temperature resistance. The required indicators are: normal temperature flexural strength, thermal flexural strength, burning loss, particle size and melting point. Optional detection indicators are: tensile strength at room temperature, tensile strength in hot state, gas volume and fluidity.

(1) High-temperature compressive strength—Simulate the actual conditions of casting and test the compressive strength of the coated sand core at 1000-1500 ℃.

(2) Heat-resistant time—time to test whether the coated sand core can maintain its strength at 700-1500 ℃ under high temperature without deformation and disintegration.

(3) Shelling resistance-test the shelling resistance of coated sand.

The above are the indicators for detecting coated sand, using trapped coated sand detection equipment, such as high temperature performance tester, gas generator, thermal strength tester and other equipment.

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