247results about How to "Reduce chalking" patented technology

In an optical connector, end faces of a pair of ferrules that hold multiple optical fibers are positioned with two guide pins and butted against each other to connect the optical fibers in the pair of ferrules. The optical connector is provided with an urging member for pushing the end faces against each other. The end faces are ground at an angle. The gap between the guide pins and guide holes, which open at the end faces and into which the guide pins are fitted, is larger than 0.004 mm and smaller than or equal to 0.008 mm. Powder caused by the friction generated when the guide pins are inserted and fitted into the guide holes is greatly reduced. Connection loss does not increase even when frequent connection and disconnection are performed, and cleaning the connector becomes unnecessary.

The invention discloses a hydrogen peroxide working liquid regeneration agent in the process of preparing hydrogen peroxide by anthraquinone method and a preparation method thereof. The regeneration effect of the regeneration agent is better than that of the active alumina anthraquinone degradation product regeneration agent used in the traditional industry. After regeneration, compared with the existing regeneration agent, the effective anthraquinone increases by 0.8% to 2.1%. During the preparation process, the reaction between magnesium oxide and water proceeds very slowly, and the magnesium hydroxide produced by the reaction between the two is a substance that is insoluble in water, and it wraps on the surface of magnesium oxide, inhibiting the further reaction between magnesium oxide and water . The generated magnesium hydroxide can appropriately increase the alkalinity of the working fluid, and the slight alkalinity is conducive to improving the activity and selectivity of the palladium catalyst, increasing the speed of the hydrogenation reaction, and avoiding a large amount of degradation. At the same time, the regenerant has good stability, is not easy to pulverize in the working fluid, and reduces the adsorption of effective anthraquinone in the working fluid, and the preparation method has simple process steps, and is applicable to large-scale industrial production. economic effect.