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tible and VOC-exempt. Due to the nature of the solvents, these release agents dry fast. Tey do not build up as quickly as 100% active release agents because they con- tain less silicone, making them easier to apply. Multiple releases can be obtained by a single application, generally up to four cycles. One disadvantage is that they are flam- mable. Unlike 100% active release agents, solvent-based ones contain VOCs (unless they are formulated with a VOC-exempt solvent), which tend to be pricey. A new release coating from ASK Chemicals has been


developed that replaces traditional, liquid-based, spray release agents. It has excellent release properties. It avoids the adhesion of resin and sand to itself, eliminating resin wipe-off. It is hard elastic when dry, and resistant to the abrasive impact of the sand in core production. An ad- ditional release agent is not required. It does not affect the cores or buildup in the core sand. When the corebox is not in production, the release coating should be removed by ice blasting. It should be then reapplied to the tooling before being put into storage to protect it. Two coreboxes were selected for testing in a foundry


setting. One was a cylinder head water jacket, and the other a cylinder head exhaust system. Te current release agent in use was applied at 4-6 cycles. First, the corebox was shot blasted to remove any adhering resin, sand, oil, and release agent. Ten a spray bottle was used to apply a primer to the core box surface. Te semi-permanent re- lease coating was applied to a dry corebox surface by spray gun with a nozzle minimum of 0.14 mm at five bars (73 PSI). 40 grams of the release coating were applied to the cylinder head water jacket in 10 minutes, and 40 grams of the release coating were applied to the cylinder head exhaust system in seven minutes. A thin coat of 30–70 µm was achieved. Te dry coat is approximately 50% of the wet coating thickness. Release coating that was inadver- tently applied to the box print area was removed with cleaner directly after spray application. Te release coating on the water jacket polymerized in 2.5 hours whereas, on the exhaust system, it was first used after 12 hours. Te ex-


它们含有的硅氧烷比100%活性脱模剂少,所以不会 与100%活性脱模剂聚集的一样快,使它们更容易涂 覆。涂覆一层就可以达到多重涂覆的效果,通常可使 用4个生产周期。它的缺点是易燃。不同于100%的 活性剂脱模剂,溶剂型脱模剂含有挥发性有机化合物 (除非它们用不含挥发性有机化合物的溶剂配制), 这往往是昂贵的。 ASK Chemicals公司已经开发出一种取代传统的 液态喷雾型脱模剂的新型防粘涂料。它具有优异的脱 模性,避免了与树脂和砂的粘附力,避免树脂残留。 在干燥状态下它具有硬弹性,避免了砂芯生产中的磨 损影响,不需要使用额外的脱模剂。在砂芯生产中不 会产生砂堆积。当芯盒不在生产状态,应该由干冰喷 射除去脱模剂涂层。在脱模剂放到仓库加以保护前, 可以重新应用于模具。


在工厂实验中选了两种芯盒。一个是气缸盖的水 套,另一个气缸盖的排气系统。当前使用的脱模剂 可以使用4-6个生产周期。首先,对芯盒进行喷丸处 理,以除去任何粘附的树脂、砂、油和脱模剂。然 后瓶装喷雾剂在芯盒表面喷底层涂料。用最小尺寸 0.14mm喷嘴的喷枪,用5巴(73 PSI)的压力,把 半永久脱模涂层涂覆到干燥的芯盒表面。把40克脱 模涂层涂覆到气缸盖水套用时 10分钟,把40克的脱 模涂层被涂覆到气缸盖的排气系统用时7分钟,得到 的薄涂层厚度为30-70微米。干法涂层厚度是湿法涂 层的约50%。如果无意中把涂层涂覆到芯盒的芯头区 域,可以在喷涂后直接用清洁剂去除。水套上的脱模 涂层可以在2.5小时内聚合,而在排气系统上,涂覆 后需要12小时才能使用。排气系统喷涂后,直到第二


Figure 2: An untreated core box (left) shows sand accumulations in contrast to the core box treated with ECOPART FR 54 N.


图2:与经过ECOPART FR 54 N处理的芯盒相对比,未经处理 的芯盒有砂堆积。


December 2015 FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION | 75


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