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Semi-Permanent Release Agent for Coldbox Core Production 应用于冷芯盒的半永久脱模剂


Several different types and formulations for release


agents are used in the coldbox process. In highly stressed areas of the core box, traditional release agents do not func- tion well. A new resistant release coating based on novel technology that adheres to the corebox has been developed and introduced into foundry production to combat resin wipe-off. Trials were run, monitoring the number of cycles before the release coating needed to be reapplied. Data from the trials shows the coating to be effective up to several hun- dreds or even thousands of cycles between applications. Traditionally, 100% active or solvent-based release agents


have been used in coldbox core production. In most cases these release agents have proven to be effective. However, in highly stressed areas of the tooling, such as under blow tubes, resin, release agent and sand buildup. 100% active release agents are based on proprietary


silicones, so they contain no VOCs (volatile organic com- pounds). Another advantage is that they are not flammable. Tey are very concentrated and typically used in high production foundry environments. Multiple releases can be achieved from a single application, possibly up to 20 cycles before reapplication. Tey have a higher up-front cost, but do not have to be applied as often, giving them a lower cost- in-use. One major disadvantage is that they can be over- applied, leading to gas defects, excessive buildup and failure of the coating to adhere to the core or mold. Solvent-based release agents are made up of various


solvents and active ingredients, primarily silicones. Te different solvents include those that are flammable, combus-


用于冷芯盒工艺的脱模剂有几种不同类型和配方。但 是在芯盒的高应力区域,传统的脱模剂就无法完全发挥 作用。涂覆在芯盒上,基于新技术的新型防粘涂层已被 开发并引入铸造生产,以防止树脂残留。试验进行的目 的是要监测重新涂覆涂层前,芯盒可使用的次数,数据 来自试验。测试表明,在重新涂覆前,该涂层可循环使 用高达数百甚至数千次。


实际上,100%活性或溶剂基脱模剂已用于冷芯盒芯 生产。在大多数情况下,这些脱模剂已被证明是有效 的。然而,在模具的高应力区域,例如排气管下方,容 易堆积树脂,脱模剂和砂。


100%的活性脱模剂是以硅氧烷为原料制备而成,所 以不含挥发性有机化合物(挥发性有机化合物)。另一 个优点是不易燃。它非常浓缩,通常用在大量生产的铸 造环境。涂覆一层就可以达到过去多重涂覆的效果,最 高可使用20个生产周期。它的初期成本较高,但是需要 使用的频率较低,所以在使用中最终成本低。它主要的 缺点是,过量施加可能导致气体产生的缺陷、过度堆积 以及造成粘附在砂芯或模具上的涂层的失效。 溶剂基脱模剂由各种溶剂和活性成分组成,主要是 硅氧烷。不同的溶剂包括易燃物、可燃物和挥发性有机 化合物。由于溶剂的性质,这些脱模剂干燥速度快。


Figure 1: After 2 hours, 85% polymerization is achieved.


图1:2小时后,可达85%的聚合。 74 | FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION December 2015


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