63results about How to "No change in thickness" patented technology

The invention relates to an ion exchange membrane for superhigh-current-density oxygen cathode electrolysis and a preparation method thereof. The ion exchange membrane is a multilayer composite film composed of a perfluorocarboxylic acid ion exchange resin layer, a carbon-nanotube-containing perfluorosulfonic acid ion exchange resin layer, a reinforcing mesh, a sulfonic acid side gas release coating and a carboxylic acid side multifunctional coating, wherein the total thickness of the basal membrane of the perfluorinated ion exchange membrane is 90-180 micrometers, the thickness of the perfluorosulfonic acid resin layer is 80-160 micrometers, the thickness of the perfluorocarboxylic acid resin layer is 8-16 micrometer, and the thickness of the two side surface coatings of the membrane is respectively 3-12 micrometers. The membrane can be prepared by a melt coextrusion or multilayer hot-press compounding technique. The membrane is used for an oxygen cathode electrolysis technique, is especially suitable for ion-exchange-membrane-process caustic soda production by a superhigh-current-density oxygen cathode electrolysis technique, and has favorable mechanical properties and electrochemical properties.

The invention discloses a high pressure deflection experimental method which can lead the sample grain refined. It comprises the following steps: 1) fixing cylinder-type up-and-down peg bars on the up-and-down rams of the presser, wherein one of the up-and-down peg bars can rotate and the end part of the rams is after fur handle; 2) cover-fixing a flank ring on the up-and-down peg bars with zero gap matching; 3) depositing the sample inside the flank ring and between the up-and-down peg bars, wherein the sample and the flank ring have the same internal diameter; 4) pressing 1-9GPa vertical pressure to the sample by presser and then keeping it and rotating the ram 0.1-10 loops.

A structure of an external wall or a roof and an external material for the external wall or a roofing material. In the structure of the external wall or the roof of a building, heat insulating and heat shielding performances are provided to a permeable layer for which dehumidifying action by the circulation of air was expected to secure high heat insulating and heat shielding performances for theexternal wall or the roof without changing the thickness of an insulator. Accordingly, when the heat insulating and heat shielding performances must not be changed, the thickness of the insulator canbe reduced less than before. The building in which an external material (11) is installed through the permeable layer (9) installed on the outside of the structure of the external wall or the roof ischaracterized in that low heat radiating sheets (8, 8a) having a low radiating performance against the heat radiation of long wavelength components are installed on the permeable layer (9) side surfaces of one or both of the external material (11) and the insulator (7).

The invention discloses a three-dimensional vane shape modification design method of a hydraulic torque converter based on conformal transformation, which solves the problems of low precision and serious distortion of three-dimensional vane modification of the traditional conformal transformation method, and belongs to the transmission technology of construction machinery. field. The method provided by the invention includes: step 1: giving the orthographic projection of the three impeller blades of the hydraulic torque converter and the circulating circle of the hydraulic torque converter; step 2: finding the edge of the inlet and outlet of the blade on the orthographic projection of the blade; step 3: Make a multi-cylindrical expansion diagram of the blade curve; Step 4: Transform the blade angle, find the coordinates of the new blade, and obtain a new blade space curve; Step 5: The blade space curve is stitched into a three-dimensional blade entity by constructing a ruled surface. The method provided by the invention can greatly reduce the error caused by the traditional conformal transformation mapping, solve the disadvantage of serious distortion of the blade angle in three-dimensional change, and at the same time ensure the accuracy of the shape of the blade head without the disadvantage of accumulating errors.