-
公开(公告)号：US4543382A
公开(公告)日：1985-09-24
申请号：US561552
申请日：1983-12-14
CPC分类号： B22F1/02 , H01F1/061 , H01F1/083 , Y10S428/90 , Y10T428/2991
摘要： The invention provides a very simple but effective means for preventing surface oxidation of fine metal powders by coating the metal powder with an organic dye. This method of surface-oxidation prevention is particularly useful for the preparation of a so-called plastic magnet which is prepared by uniformly blending a dye-coated fine powder of a magnetic alloy such as a rare earth-cobalt based permanent magnet with a thermoplastic resin such as a nylon or polyphenylene sulfide resin followed by molding the resin-powder blend into a magnet form. In addition to the remarkably improved magnetic properties of the thus prepared plastic magnets as a result of high loading and absence of degradation by oxidation, the danger of spontaneous ignition of the magnet powder in molding can be eliminated almost completely. Surface treatment of the dye-coated magnet powder with a silicone fluid gives further improved results.
摘要翻译： 本发明提供了通过用有机染料涂覆金属粉末来防止细金属粉末的表面氧化的非常简单但有效的手段。 这种表面氧化防止方法对于制备所谓的塑料磁体是特别有用的，该塑料磁体是通过将诸如稀土 - 钴基永磁体的磁性合金的染料包覆的细粉与热塑性树脂 例如尼龙或聚苯硫醚树脂，随后将树脂 - 粉末混合物模塑成磁体形式。 除了由于高负载和氧化劣化而导致的如此制备的塑料磁体的显着改善的磁性能之外，几乎完全可以消除在成型中磁粉的自发点火的危险。 用硅氧烷流体对染料涂覆的磁体粉末进行表面处理，可以进一步提高结果。
-
公开(公告)号：US4497722A
公开(公告)日：1985-02-05
申请号：US626742
申请日：1984-07-02
申请人： Michinori Tsuchida , Tokuji Abe , Hajime Kitamura
发明人： Michinori Tsuchida , Tokuji Abe , Hajime Kitamura
CPC分类号： H01F1/061 , H01F1/0552 , H01F1/0558 , Y10S428/90
摘要： The plastic magnet composition provided by the invention comprises a thermoplastic resin as a binder and a powder of a metallic or alloy-type magnet which is coated on the particle surface with a phosphorus-containing compound having at least one phosphorus-to-oxygen linkage in a molecule such as phosphoric acid and related compounds. By virtue of the surface coating, the magnet powder is freed from the degradation by air oxidation and the danger of ignition in the molding process so that plastic magnets of high performance can be readily manufactured with safety. The advantages of the coating layer are further increased when the coating layer is formed of a combination of the phosphorus-containing compound and an organic dye compound. An overcoating on the thus coated magnet powder with an organopolysiloxane has an effect of increased lubricity.
摘要翻译： 由本发明提供的塑料磁体组合物包括作为粘合剂的热塑性树脂和金属或合金型磁体的粉末，其在具有至少一个磷 - 氧键的含磷化合物的颗粒表面上涂覆 分子如磷酸和相关化合物。 借助于表面涂层，可以通过空气氧化降低磁体粉末和模制过程中点燃的危险，从而可以安全地制造高性能的塑料磁体。 当涂层由含磷化合物和有机染料化合物的组合形成时，涂层的优点进一步增加。 这样涂覆的磁体粉末与有机聚硅氧烷的外涂层具有提高的润滑性的效果。
-
公开(公告)号：US4992498A
公开(公告)日：1991-02-12
申请号：US446765
申请日：1989-12-06
摘要： The polyvinyl chloride resin composition of the invention is highly heat-resistant as a result of compounding with an organic tin mercaptide compound as a heat stabilizer but is still free from the problem of the unpleasant odor emitted by the mercaptide compound owing to a specific deodorizing agent compounded therewith so that the composition is suitable as a molding resin composition for food containers. The above mentioned deodorizing agent is a diterpenic acid such as abietic acid or a rosin which is a crude mixture of several kinds of diterpenic acids obtained as a natural product.
-
-
搜索结果
3 条记录 (耗时 0.01 秒)
