Question 1: What are the raw materials and production process of molecular sieve powder?
Answer: The main raw material of molecular sieve powder is molecular sieve powder (i.e., silicate). 3A molecular sieve is potassium sodium silicate aluminate, 4A molecular sieve is sodium silicate aluminate, and 5A molecular sieve is calcium silicate aluminate. The main production method is to activate the original powder at high temperature to produce molecular sieve powder.
Question 2: What are the main functions of molecular sieve powder (and what is the difference from defoamer)?
Answer: Molecular sieve powder is used to absorb excess moisture in the system; defoamer mainly functions to eliminate foam and does not absorb moisture. The principle of defoamer is to break the balance of foam stability, causing the bubble holes to rupture. Molecular sieve powder absorbs moisture to prevent it from reacting with other substances to form gas, and at the same time adsorbs other gas molecules to eliminate foam.
Question 3: What factors determine the price of molecular sieve and why is the price of 4A the lowest?
Answer: The price of 4A molecular sieve is the lowest because 3A and 5A are replaced from 4A.
Question 4: What is the difference between molecular sieve powder and original powder?
Answer: The difference is that original powder is the raw material of molecular sieve powder, and original powder has no activity and cannot absorb moisture.
Question 5: Which gels can be used with molecular sieve powder?
Answer: Gels with trace moisture that can affect product properties can be used.
Question 6: What is the temperature that molecular sieve powder can withstand in gel? Answer: Below 500℃. The original powder of molecular sieve can withstand 550℃, and when heated to a high temperature, it will lose its crystalline water, and when the temperature drops to room temperature, it will slowly absorb moisture and restore. The theoretical firing temperature is 900℃, and when the crystal structure is destroyed, it cannot be restored and does not have water absorption properties. Therefore, molecular sieve powder can withstand a temperature of 500℃ or below.
Question 7: What is the recommended addition amount of molecular sieve powder?
Answer: The addition amount of molecular sieve powder is determined according to the trace moisture to be removed in the system. Static water adsorption at 24 means that under ideal conditions, the amount of moisture that molecular sieve powder can absorb is 24% of its own weight. The specific addition amount needs to be analyzed based on different raw materials.
Question 8: Will molecular sieve powder affect the viscosity of the glue?
Answer: Molecular sieve powder does not have the effect of increasing viscosity. The influence on the viscosity of the system is only the effect of other inorganic material additions.
Question 9: Can molecular sieve powder be added to polyols?
Answer: The A component of two-component polyurethane is usually polyester polyol and polyether polyol, and molecular sieve powder is generally added to the A component.
Question 10: Will molecular sieve powder cause water to be reabsorbed, for example, in ink?
Answer: No. Molecular sieve powder is also a type of molecular sieve and belongs to static molecular sieve. It cannot regenerate in the system. The adsorption and desorption of molecular sieve are conditional, and desorption requires high temperature and low pressure. In customer use, molecular sieve powder forms a uniform substance with resin, and does not have the conditions for desorption, which is also the reason why molecular sieve powder cannot regenerate.
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