Die casting release agents primarily serve four key functions, with demolding being the most critical, followed by lubrication and isolation, and finally cooling.
After spraying, Kezhiying die casting release agents form a high-temperature-resistant, dense film on the mold surface. This reduces the coefficient of friction between molten aluminum/magnesium and the mold, enabling the rapidly flowing metal to fill the mold smoothly and ensuring the casting forms properly. This function is fundamental to successfully ejecting the casting from the mold.
To optimize performance, select a release agent tailored to specific operating conditions, including die casting machine tonnage, mold temperature, molten metal temperature, and spray duration. Aluminum alloy die casting release agents are formulated with high-temperature-resistant lubricating components. Uniform and appropriate spraying of the release agent promotes the production of smooth, high-quality castings. Insufficient lubrication, however, leads to issues like castings sticking to the mold, difficulty in ejection, reduced production efficiency, and shorter mold lifespan.
Water-based metal die casting release agents form a nano-level film on the mold surface, effectively isolating the mold from the casting. This not only facilitates better casting formation but also protects the mold from direct contact with molten metal.
Water-based die casting release agents feature an oil-in-water emulsion structure. When sprayed onto the mold via a spray gun or automatic system, they help reduce mold temperature. This mitigates thermal shock from prolonged exposure to high heat. For example, older facilities or plants with alkaline/saline water (where cooling water pipes are rarely used) often rely on heavier release agent spraying to lower mold temperatures (especially above 350°C), ensuring smoother aluminum alloy casting formation and extending mold life.
Die casting release agents are primarily used in automotive/motorcycle manufacturing, mechanical/electrical equipment, mobile phone mid-frames, hardware, smart locks, communications, and home appliances—with automotive/motorcycle components being the largest application area.
Select the Right Release Agent and Dilution Ratio
First, choose a release agent matched to the specific application. Then, follow standard practices or supplier recommendations for dilution. Most commercial release agents have a solid content of 18%–28%, with a typical dilution ratio of 80–200 times. Deviating significantly from this range (unless for special materials or extreme conditions) may cause sticking, carbon deposition, or yellowing of castings.
Dilute Release Agent in Water (Not Reverse)
Always add the release agent to water (not water to the agent). Reverse mixing can cause demulsification, compromising demolding performance, dilution stability, and potentially clogging nozzles.
Avoid Agitation or Blowing During Use
Minimize stirring or blowing while using the release agent. Agitation or air blowing can also trigger demulsification, leading to component precipitation and reduced effectiveness.
Use Purified Water for Dilution
Prefer purified water. If unavailable, tap water is acceptable. Avoid well water, which contains high levels of calcium and magnesium ions that can precipitate, causing carbon buildup in castings.
Storage Temperature Control
Store aluminum-magnesium alloy die casting release agents between 5°C and 35°C. Temperatures below freezing cause repeated freeze-thaw cycles, leading to active ingredient precipitation. Excessively high temperatures (especially with high release agent concentrations) may also induce demulsification and precipitation.
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