Abstract: Provided are a fatigue-resistant supramolecular polyurethane (PU), and a preparation method and use thereof. The preparation method includes: mixing a diol, a diisocyanate, a catalyst, and a first organic solvent to obtain a mixture, and subjecting the mixture to prepolymerization to obtain a PU prepolymer, the diol being selected from the group consisting of a polyester diol and a polyether diol; mixing the PU prepolymer, 4,4?-diaminodicyclohexylmethane, and a second organic solvent to obtain a mixed mixture, and subjecting the mixed mixture to chain extension to obtain a chain extension product; and mixing the chain extension product, reinforcing phase total organic carbon (TOC), and a third organic solvent to obtain a mixed system, and subjecting the mixed system to first addition reaction to obtain the fatigue-resistant supramolecular PU, the reinforcing phase TOC having a structure shown in formula I.

Abstract: Provided are a self-healing polyurethane (PU) material, a double-layer self-healing PU film, and a preparation method and use thereof. In the disclosure, the self-healing PU material includes a PU material I and a PU material II that are packaged separately. A soft-layer PU film prepared based on the PU material I and a hard-layer PU film prepared based on the PU material II could be combined to form a double-layer PU film.

Abstract: Provided are a self-healing polyurethane (PU) material, a double-layer self-healing PU film, and a preparation method and use thereof In the disclosure, the self-healing PU material includes a PU material I and a PU material II that are packaged separately. A soft-layer PU film prepared based on the PU material I and a hard-layer PU film prepared based on the PU material II could be combined to form a double-layer PU film.

Abstract: The present disclosure belongs to the technical field of polymer materials, and in particular relates to a chain extender and a preparation method and application thereof, a recyclable thermosetting polyurethane and a preparation method thereof. The present disclosure provides a chain extender whose chemical formula is shown in formula I. The chain extender provided by the present disclosure contains two types of dynamic covalent bonds, and the total number of dynamic covalent bonds is 4. The thermosetting polyurethane prepared by the provided chain extender has better hot-pressing repair efficiency. The results of the examples show that under the same hot-pressing conditions, the repair efficiency of the thermosetting polyurethane prepared by the 4,4?-dithiodianiline chain extender is 59%. The repair efficiency of thermosetting polyurethane is 97%, which is significantly improved.

Abstract: The present disclosure belongs to the technical field of polymer materials, and in particular relates to a chain extender and a preparation method and application thereof, a recyclable thermosetting polyurethane and a preparation method thereof. The present disclosure provides a chain extender whose chemical formula is shown in formula I. The chain extender provided by the present disclosure contains two types of dynamic covalent bonds, and the total number of dynamic covalent bonds is 4. The thermosetting polyurethane prepared by the provided chain extender has better hot-pressing repair efficiency. The results of the examples show that under the same hot-pressing conditions, the repair efficiency of the thermosetting polyurethane prepared by the 4,4?-dithiodianiline chain extender is 59%. The repair efficiency of thermosetting polyurethane is 97%, which is significantly improved.

Abstract: The well killing device comprises: a first path; a flow regulating device; a pressure detector and a controlling device. The controlling device may control the discharge amount of the killing fluid in different killing stages according to the gas-fluid two-phase flow theory, the pressure of the killing fluid at the wellhead, and the rising speed of the drilling column.

Abstract: Volumetric solar receivers are disclosed. An illustrated volumetric solar receiver includes a heat absorbing cavity (1), a glass window, and a working fluid inlet pipe (2) and an outlet pipe (3) connecting with the heat absorbing cavity (1). The glass window comprises a double-layer hollow glass (41 and 42). The hollow portion of the glass window forms the inner cavity (43). This inner cavity (43) is provided with an outlet (44) connected to the heat absorbing cavity (1). The working fluid inlet pipe (2) is connected with this inner cavity (43) and further with the heat absorbing cavity (1) via the outlet (44) of this inner cavity. This arrangement keeps the temperature at the glass window low and prevents local overheating, and also avoids waste of heat carried away by the cooling fluid from the glass window.

Abstract: This invention relates to a directed reflection light collecting device with planar reflectors, wherein a number of planar reflectors are arranged on a frame in mutual parallel. This frame is rotatably supported via a transversal main turning shaft on the supports of an azimuth angle adjusting mechanism. The altitudinal angle adjusting mechanism drives the frame in a controlled manner causing the planar reflectors on it to move. In this invention, the altitudinal angle of a number of planar reflectors is synchronized via a simple frame structure so that they can always project the reflected sunlight in a substantially fixed direction into the given area in conjunction with the azimuth angle adjusting mechanism.

Abstract: Heliostat devices are disclosed. A disclosed heliostat device comprises planar reflectors and their frame, an azimuth angle adjusting mechanism and an altitudinal angle adjusting mechanism, and a sunlight tracking sensor. This device can perform sun tracking and accurate projection in fixed direction, via the directed sensor mounted in the fixed projection direction to form multi-stage control sensors.

Abstract: Volumetric solar receivers are disclosed. An illustrated volumetric solar receiver includes a heat absorbing cavity (1), a glass window, and a working fluid inlet pipe (2) and an outlet pipe (3) connecting with the heat absorbing cavity (1). The glass window comprises a double-layer hollow glass (41 and 42). The hollow portion of the glass window forms the inner cavity (43). This inner cavity (43) is provided with an outlet (44) connected to the heat absorbing cavity (1). The working fluid inlet pipe (2) is connected with this inner cavity (43) and further with the heat absorbing cavity (1) via the outlet (44) of this inner cavity. This arrangement keeps the temperature at the glass window low and prevents local overheating, and also avoids waste of heat carried away by the cooling fluid from the glass window.

Abstract: Heliostat devices are disclosed. A disclosed heliostat device comprises planar reflectors and their frame, an azimuth angle adjusting mechanism and an altitudinal angle adjusting mechanism, and a sunlight tracking sensor. This device can perform sun tracking and accurate projection in fixed direction, via the directed sensor mounted in the fixed projection direction to form multi-stage control sensors.

Abstract: This invention relates to a directed reflection light collecting device with planar reflectors, wherein a number of planar reflectors are arranged on a frame in mutual parallel. This frame is rotatably supported via a transversal main turning shaft on the supports of an azimuth angle adjusting mechanism. The altitudinal angle adjusting mechanism drives the frame in a controlled manner causing the planar reflectors on it to move. In this invention, the altitudinal angle of a number of planar reflectors is synchronized via a simple frame structure so that they can always project the reflected sunlight in a substantially fixed direction into the given area in conjunction with the azimuth angle adjusting mechanism.

Abstract: A sunlight tracking sensor has light sensing faces for receiving light signals from all directions. The light sensing faces are arranged in four quadrants. Each quadrant of the light sensor can sense light signals in two coordinate axes direction. The light signals are processed and used to adjust a light collecting device to track light from the sun.