The strength of the molding sand increases at a faster rate; after blowing CO2 and placing it for 3 ~ 6h, the sand mold can be combined and poured. When hardening with organic ester alone, the amount of organic ester added is generally 8 ~ 15% of the amount of water glass.In recent years, the CO2-organoester composite hardened water glass sand process has a trend of expanding application. Increasing the amount of water glass added will increase the final strength of the sand mold, but its residual strength will also increase, making it difficult to clear the sand. The organic ester hardener can form a uniform mixture with the binder, and can fully exert the binding effect of the binder.
However, the CO2-organic ester compound hardening process needs to add 0. Therefore, the addition amount of organic ester accounts for 4 ~ 6% of the addition amount of water glass is more appropriate. In actual production, the amount of water glass added is generally controlled at about 4%. When the amount of water glass added is too small, the final strength is too small to meet the requirements for use. Due to diffusion, the reaction is always from outside to inside. According to analysis, when the molding sand reaches the best blowing strength, the water glass that reacts with CO2 gas is about 65%, which means that the water glass does not fully play the role of adhesion, and at . After the CO2 gas contacts the water glass, it immediately reacts with it to form a gel. The process is as follows: add a certain amount of organic ester (usually half of the normal required amount or 4 ~ 6% of the weight of the water glass) when mixing sand; after the molding is completed, blow CO2 to harden to the mold release strength (generally requires compression (Strength is about 0.
All parts of the core sand build strength at the same speed. The hardening mechanism is: when the water glass sand blows CO2, under the action of the gas pressure difference and the concentration difference, the CO2 gas will try to flow in all directions of the molding sand.5 ~ 1% more water glass than the simple organic ester hardening method, which will make the regeneration of the old sand of water glass more difficult. The compound hardening method can fully exert the dual advantages of CO2 hardening and organic ester hardening, and can fully exert the bonding effect of water glass to achieve fast curing speed, early mold release, high strength, good collapsibility, and low cost. When using composite hardening, it is estimated that about half CNC machining https://www.bronzecast.net/ of the water glass has hardened when blowing CO2, and about half of the water glass has not yet been hardened. Comprehensive effect..net/">copper fitting Manufacturers least more than 35% of the water glass does not react. Therefore, in a short time, no matter what method is used to control the CO2 gas, it is impossible to make it react with all the water glass. The outer layer first forms a gel film, which prevents the CO2 gas and water glass from continuing the reaction
However, the CO2-organic ester compound hardening process needs to add 0. Therefore, the addition amount of organic ester accounts for 4 ~ 6% of the addition amount of water glass is more appropriate. In actual production, the amount of water glass added is generally controlled at about 4%. When the amount of water glass added is too small, the final strength is too small to meet the requirements for use. Due to diffusion, the reaction is always from outside to inside. According to analysis, when the molding sand reaches the best blowing strength, the water glass that reacts with CO2 gas is about 65%, which means that the water glass does not fully play the role of adhesion, and at . After the CO2 gas contacts the water glass, it immediately reacts with it to form a gel. The process is as follows: add a certain amount of organic ester (usually half of the normal required amount or 4 ~ 6% of the weight of the water glass) when mixing sand; after the molding is completed, blow CO2 to harden to the mold release strength (generally requires compression (Strength is about 0.
All parts of the core sand build strength at the same speed. The hardening mechanism is: when the water glass sand blows CO2, under the action of the gas pressure difference and the concentration difference, the CO2 gas will try to flow in all directions of the molding sand.5 ~ 1% more water glass than the simple organic ester hardening method, which will make the regeneration of the old sand of water glass more difficult. The compound hardening method can fully exert the dual advantages of CO2 hardening and organic ester hardening, and can fully exert the bonding effect of water glass to achieve fast curing speed, early mold release, high strength, good collapsibility, and low cost. When using composite hardening, it is estimated that about half CNC machining https://www.bronzecast.net/ of the water glass has hardened when blowing CO2, and about half of the water glass has not yet been hardened. Comprehensive effect..net/">copper fitting Manufacturers least more than 35% of the water glass does not react. Therefore, in a short time, no matter what method is used to control the CO2 gas, it is impossible to make it react with all the water glass. The outer layer first forms a gel film, which prevents the CO2 gas and water glass from continuing the reaction
コメント