31results about How to "Good test reproducibility" patented technology

The invention relates to a device for testing the pull torque, and the device comprises a pull torque test platform, a power line fixing device, a weight assembly and a lifting rotary device. The power line fixing device is arranged at the upper end of the pull torque test platform, while the lifting rotary device is arranged at the lower end of the pull torque test platform. A to-be-tested power line is fixed on the pull torque test platform via the power line fixing device. The operation method comprises the following steps: configuring the weight of the weight assembly according to the pressure to be applied, connecting the configured weight assembly with the power line, and placing the weight assembly connected with the power line on the lifting rotary device; rotating the lifting rotary device as required by the test to enable the power line at a required to-be-tested state; reciprocating the lifting rotary device to finish multiple times of pull torque tests of the power line at the to-be-tested state. The device is simple in operation and good in test reproducibility by using weight for testing. Meanwhile, the test tension and torque are applied more uniformly.

The invention relates to a method for preparing 2, 6-dichloro-5-fluorine nicotinoyl ethyl acetate, which comprises the following steps: taking 2, 6-dichloro-5-fluorine-3-pyridine carbonitrile as a raw material, producing a zinc salt intermediate 3-(2, 6-dichloro-5-fluorine-3-pyridyl)-3-imino ethyl propionate zinc bromide, and then acidating the zinc salt intermediate into an imido ester intermediate 3- (2, 6-dichloro-5-fluorine-3-pyridyl)-3-imino ethyl propionate, thus obtaining the 2, 6-dichloro-5-fluorine nicotinoyl ethyl acetate through the acidolysis of the imido ester intermediate. The method is characterized in that the temperature for acidification of the zinc salt intermediate to the imido ester intermediate is 0-10 DEG C and the pH thereof is 2-3, the oily liquid of unhydrous imido ester intermediate can be separated through extracting and distilling the produced imido ester intermediate; the acidolysis of the imido ester intermediate is carried out in absolute ethyl alcohol solvent, and the acid catalyzed alcoholysis of the oily liquid of unhydrous imido ester intermediate is carried out with absolute ethyl alcohol solution of hydrogen chloride or concentrated sulfuric acid under the temperature of 20-30 DEG C. The total yield reaches 88-95 percent, the purity reaches 99 percent, and the invention has good reproducibility.

The invention belongs to a microcoulomb analysis method for the chlorinity high-temperature burning of organic phosphate fire-resistant oil and a device thereof, belonging to the field of power analysis chemistry and solving the defects of complicated operation steps, long time consumption, unobvious titration end point, poor accuracy and repetitiveness and high cost existing in the prior art. Thedevice comprises a high-temperature furnace and a burning tube inserted in the high-temperature furnace; the burning tube is provided with an oxygen interface, a nitrogen interface and a sample inletand comprises a gasifying section and a burning section, one end of the burning tube is connected with a sample inlet device, and the other end is connected with an electrolytic bath. The device adopts heating, gasifying and electrolytic analysis methods to obtain the chlorinity of a sample. The invention has simple and convenient operation and rapid analysis speed and adopts a microcoulomb method to analyze titration and judge the end point so as to be more accurate than the prior oxygen bomb method by visual inspection and manual measurement, have good test repetitiveness, avoid using toxicchemical reagents and improve the safety.