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2. 发明申请

WO1989010222A1 PLASTIC MOULDINGS FOR FILTERING HOT LIQUIDS, IN PARTICULAR MOLTEN METALS, AND PROCESS FOR PRODUCING THEM 审中-公开
标题翻译：用于过滤热液体，特别是金属的塑料模具及其制造方法
公开(公告)号：WO1989010222A1
公开(公告)日：1989-11-02
申请号：PCT/HU1988000021
申请日：1988-04-18
申请人： MÜANYAGIPARI KUTATO INTÉZET , CSEPEL MÜVEK VAS- ÉS ACÉLÖNTODE , GYÖRÖK, György , KECSKEMÉTHY, Géza , KOVACSAY, István , SZABO, Zsolt , VÖRÖS, Arpád
发明人： MÜANYAGIPARI KUTATO INTÉZET , CSEPEL MÜVEK VAS- ÉS ACÉLÖNTODE
IPC分类号： B22D35/04
CPC分类号： B22C9/086 , C08K13/04 , C08L61/00
摘要： The invention concerns specially shaped plastic mouldings for filtering liquids at elevated temperatures, in particular for filtering molten metals, and a process for producing said mouldings from compositions based on furfuryl alcohol/formaldehyde resins. The mouldings have filtration apertures (4) which expand from a cylinder to form a truncated pyramid or filtration apertures in the form of truncated pyramids which expand toward the base, the ratio of the cross-sections of the truncated pyramid and the cylinder or the ratio of the areas of the base and covering surface of the truncated pyramid lying between 20:1 and 2:1. The mouldings are also provided with ribs (2) and possibly with a plastic film (3) 0.2-0.5 mm thick over the filtration apertures (4). The mouldings are produced by mixing 28-55 % by mass of a furfuryl alcohol/formaldehyde resin with 40-60 % by mass of dry matter, 4.5-15 % by mass of a crosslinking catalyst, preferably mineral or organic acids in a concentration of 10-30 % by mass, 2-5 % by mass of cut glass fibres, 1-10 % by mass of aluminium flakes, and 20-40 % by mass of other additives, preferably graphite, allowing the mixture to stand for 1-24 hours, and then shaping the mouldings preferably by compression.
摘要翻译：本发明涉及用于在升高的温度下过滤液体的特殊形状的塑料模制件，特别是用于过滤熔融金属的方法，以及由基于糠醇/甲醛树脂的组合物制备所述模制品的方法。模制品具有过滤孔（4），其从圆柱体膨胀形成截锥体或以截头棱锥形式向基座扩展的过滤孔，截顶金字塔与圆柱体的横截面比例或比例截面金字塔的基部和覆盖面的面积在20：1和2：1之间。模制品还设置有肋（2），并且可能具有在过滤孔（4）上的0.2-0.5mm厚的塑料膜（3）。通过将28-55质量％的糠醇/甲醛树脂与40-60质量％的干物质混合，4.5-15质量％的交联催化剂，优选矿物或有机酸的浓度为 10-30质量％，切割玻璃纤维2-5质量％，铝薄片1-10质量％，其他添加剂优选石墨20-40质量％，使混合物静置1- 24小时，然后优选通过压缩成型模制品。

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