37results about How to "Extended spin time" patented technology

A yo-yo having improved spin time is disclosed. The yo-yo has a body comprising two side members joined together at their centers by a fixed axle. A yoke for receiving a string in winding relation is magnetically supported for substantially frictionless rotation about the axle. A pair of radially-magnetized ring magnets disposed at opposite ends of the yoke are received within a corresponding pair of radially-magnetized ring magnets disposed within recesses in the side members. A pair of axially-magnetized ring magnets disposed at opposite ends of the yoke confront a corresponding pair of axially-disposed ring magnets set into the body side members. The magnets are magnetically polarized such that they mutually repel each other. As a result, the yo-yo is free to spin around the yoke for an extended period of time.

The invention discloses an improved processing method of plant insulating oil. The method includes the first step of coalescence dewatering, the second step of vacuum dewatering and the third step of vacuum mixing and refined filtering so that plant insulating oil can be obtained. The water content of the plant insulating oil processed through the improved processing method is smaller than 50 mg / kg, and 100 ml oil contains 2000 or less of impurity particles with diameter larger than 5 microns.

The invention relates to a thermosetting phenolic resin and its preparation method and application. The phenolic resin of the present invention is prepared by reacting a thermosetting phenolic resin and a thermoplastic phenolic resin, which solves the contradiction between the high viscosity of the traditional phenolic resin and the narrow process window, and maintains the advantages of good heat resistance and high carbon residue rate of the phenolic resin. The thermosetting phenolic resin suitable for the resin film infiltration process (RFI) proposed by the invention has low cost, simple preparation method, strong operability, and is convenient for large-scale preparation. The phenolic resin has excellent molding and curing process performance, heat resistance and carbon residue performance. It is an excellent high-performance composite material matrix resin and has good application prospects in high-tech fields such as heat protection. At the same time, the resin It can be used to prepare phenolic resin flame-retardant prepreg by dry method, and has great application potential in the fields of flame-retardant and fire-resistant interior materials for large aircraft and high-speed trains.

The invention provides a deadweight flattening-type dehydrator which comprises an upper dehydration beam, a lower dehydration beam and a transmission mechanism, wherein the transmission mechanism is used for driving the upper dehydration beam and the lower dehydration beam to move in the same direction or opposite directions; the transmission mechanism comprises a post rod; the dehydrator also comprises a bracket, a locking regulating component and an upper dehydration beam spacing component; the bracket is arranged on the end part of the upper dehydration beam and provided with a through hole; the first end of the post rod pass through the through hole of the bracket and extends and can move in the through hole of the bracket within a certain range; and the locking regulating component is installed on the post rod. The deadweight flattening-type dehydrator can prolong the dehydration time, remove the water in the process of making vegetable cakes to the maximum and shorten the dryingtime of the vegetable cakes, thereby realizing the technical effect of energy conservation and consumption reduction.

The invention discloses an industrial pure PU foam alcoholysis recovery method and a special recycling feeding device, which is characterized in that the recycling feeding device includes a reaction kettle, a pneumatic gate valve, a feeding variable diameter elbow, and a main feeding screw conveying Machine, auxiliary feeding double-screw feeding conveyor, feeding hopper, soft connection and catalyst, hexamethylenetetramine and hydrogen peroxide and other small material feeding devices; the alcoholysis recovery method includes feeding, alcoholysis and recovery steps; The invention has the advantages of fast feeding speed and accurate feeding, which ensures that the quality of the pure PU foam feed and the mass ratio of the added main recovery alcoholysis agent are stable, and ensures that the catalyst, hexamethylenetetramine and hydrogen peroxide can be added in time according to the process requirements. In the reaction system, the control indicators of each batch of recycled polyols are guaranteed to be stable. The pure PU foam feeding method is combined with the recycling process to produce recycled polyols with stable performance, moisture content, and relatively low VOC indicators.

The invention discloses a preparation method of 4,4'-biphenol diglycidyl ether. In the preparation method provided by the invention, 4,4'-biphenol and epichlorohydrin are used as raw materials to be synthesized by a two-step method under the effect of a heterogeneous catalyst. The preparation method comprises the following steps: firstly, carrying out a ring-opening etherifying reaction, then carrying out a ring-closing reaction, and in the alkalizing process, separating out water generated in the reaction by a water-separating technique, so that the reaction shifts to the right at equilibrium, and various hydrolysis secondary reactions in the system can be controlled. The product obtained by the technique has high epoxide equivalent and high yield, the technique has simple reaction stepsand is convenient for posttreatment, and experimental results show that the epoxide number is 0.65-0.67, and the melting range is 159.1-160.4 DEG C.

By attaching clothes while correcting the imbalance in the low-speed rotational speed range of the dehydration process, it is possible to shorten the unbalance correction time of large garments such as blankets, or when combining blankets of different materials, and provide a front-loading washing machine that suppresses increases in dehydration time and power consumption. and a tumble washer dryer. It includes: a rotatable drum whose rotation axis is horizontal or inclined with the depth side at the bottom; an outer tub that encloses the drum and is used to store washing water; a shell that encloses the outer tub; judges the laundry in the drum The judging mechanism of the attached state and the imbalance judging mechanism of the first dehydration operation carry out the judgment of the attached state of the clothes and the judgment of the imbalance, and when the imbalance is greater than the threshold value of the imbalance judging mechanism, according to the first time The rotation control of the second and subsequent dehydration operations to restart dehydration is set based on the determination of the attached state of the clothes in the dehydration operation, and the rotation control of the second and subsequent dehydration operations is different from the first dehydration operation.

The invention relates to a melt / solid state polycondensation preparation method for polylactic acid, which mainly solves the problems of long reaction time, difficult continuous production or high cost in the prior art. The method comprises the following steps of: 1) performing a dehydration oligomerization reaction of lactic acid at the temperature of between 100 and 160 DEG C under the absolutepressure of between 6,000 and 25,000 Pa and under the action of a catalyst A for 0.5 to 5 hours first, and continuing the ehydration oligomerization reaction at the temperature of between of 120 and 180 DEG C under the absolute pressure of between 200 and 1,500 Pa and under the action of the catalyst A for 0.5 to 5 hours to generate a product I; 2) performing a melt polycondensation reaction of the product I at the reaction temperature of between 150 and 200 DEG C under the absolute pressure of between 30 and 600 Pa and under the action of a catalyst B for 0.5 to 15 hours to generate a polylactic acid prepolymer and lactide serving as a by-product, and refluxing the lactide to a reaction mixture at the reflux temperature of between 70 and 95 DEG C; 3) pelletizing the polylactic acid prepolymer obtained in the step 2), and crystallizing in an inertia airflow at the temperature of between 50 and 130 DEG C for 0.5 to 10 hours; and 4) performing a solid state polycondensation reaction of the polylactic acid prepolymer processed in the step 3) in the inertia airflow at the temperature of between 120 and 170 DEG C for 5 to 40 hours to obtain the polylactic acid. The technical scheme of the invention better solves the problem, and can be used for the industrial production of the polylactic acid.

The invention provides a washing machine, wherein a washing dehydration tank and a pulsator integrally formed in an outer groove is rotated at a high speed so as to perform the dehydration of laundry. Meanwhile, a mechanism is provided to restrain the vibration of the washing dehydration tank via the electrical control. When the outer groove is made of synthetic resin, the intrinsic value of the outer groove (inherent resonance point) varies with the temperature. When the temperature of the outer groove rises, the rotation speed of the washing dehydration tank is lowered so as to be away fromthe inherent value of the outer groove and prevent the abnormal vibration. In addition, the temperature of the outer groove can also be directly or indirectly determined. If the temperature rises, the dehydration speed is lowered. If the temperature decreases, the dehydration speed is increased. Meanwhile, by utilizing a washing machine with drying function, wherein the circulation of the washingdehydration tank is realized by the heating of a heater, if the temperature at the outlet of the heater rises, the dehydration speed is lowered. If the temperature decreases, the dehydration speed isimproved.