42results about How to "Solve easy collapse" patented technology

The invention provides a preparation method of a polytetrafluoroethylene membrane. The preparation method comprises spinning solution preparation, fiber formation and sintering. The preparation methodis characterized in that a fiber formation carrier and a solvent are processed into a solution, the solution is added into a polytetrafluoroethylene emulsion, the fiber formation carrier is polyacrylic acid, the solvent is water, the sintering process utilizes programmed temperature-controlled segmented continuous sintering and comprises that in a flowing atmosphere, the materials are heated fromthe room temperature to 120-200 DEG C at a heating rate of 3-10 DEG C / min, then are subjected to heat preservation at 120-200 DEG C for 30-120min, then are heated from the 120-200 DEG C to 360-400 DEG C at a heating rate of 2-8 DEG C / min and then are subjected to heat preservation at 360-400 DEG C for 5-120min, the sintering product is cooled from 360-400 DEG C to 150-200 DEG C at a rate of 3-15DEG C / min in a flowing atmosphere, is subjected to heat preservation at 150-200 DEG C for 30-120min and then is naturally cooled, and the polytetrafluoroethylene membrane has thickness of 174-222 microns. The beaded ultra-fine fiber polytetrafluoroethylene membrane is formed through the preparation method, forms a hydrophobic surface with a multi-level rough structure, has a surface water contactangle of greater than or equal to 150 degrees and porosity of 80% or more, solves the problem that in the polytetrafluoroethylene precursor membrane sintering, fibers easily collapse, has good fiber morphology and surface integrity and higher strength and toughness and can bear a certain vacuum pressure.

The invention provides a preparation method of a polytetrafluoroethylene film. The preparation method comprises the steps of preparing fibers with a fiber forming carrier and sintering and is characterized by adopting multistep continuous sintering through program temperature control, and in flowing atmospheres, increasing the temperature from a room temperature to 120-200 DEG C at a rate of 3-10 DEG C / min and insulating at 120-200 DEG C for 30-120 minutes; increasing the temperature from 120-200 DEG C to 360-400 DEG C at a rate of 2-8 DEG C / min and insulating at 360-400 DEG C for 5-120 minutes; carrying out cooling treatment after sintering: in the flowing atmospheres, reducing the temperature from 360-400 DEG C to 150-200 DEG C at a rate of 3-15 DEG C / min, insulating at 150-200 DEG C for 30-120 minutes and then carrying out natural cooling. The preparation method has the beneficial effects that the polytetrafluoroethylene film with bead-like superfine fibers is prepared and a hydrophobic surface with a multistage coarse structure is formed together; the surface water contact angle is not less than 150 degrees and the porosity is higher than 80%; the problem that fibers are easy to collapse during sintering of a polytetrafluoroethylene precursor film is solved; the fibers have intact morphologies and surfaces and greatly improved strength and tenacity and can bear a certain vacuum pressure.

The invention discloses a wooden door with an anti-collision structure. The wooden door comprises a door body and a surface plate. A mechanical lock is arranged at the locking end of the door body, agroove is formed in the outer side face of the door body, the surface plate is embedded into the groove, a clearance exists between the surface plate and the bottom face of the groove, and buffering set structures are arranged on the upper portion and the lower portion in the clearance between the surface plate and the bottom face of the groove. The buffering set structures are formed by evenly arranging a plurality of buffering structures, one end of each buffering structure is fixed to the inner bottom face of the groove, and the other end of each buffering structure is fixed to the inner side face of the surface plate. The wooden door with the anti-collision structure is not likely to be cracked up, and can be used as a security door.

The invention provides a preparation method of a polytetrafluoroethylene film. The preparation method comprises the steps of preparing a spinning solution, preparing fibers and sintering and is characterized by adding polytetrafluoroethylene emulsion after preparing a solution with a fiber forming carrier and a solvent, wherein the fiber forming carrier is sodium alginate, and the solvent is water; adopting multistep continuous sintering through program temperature control, and in flowing atmospheres, insulating at 90-120 DEG C for 30-120 minutes, increasing the temperature from 90-120 DEG C to 260-300 DEG C at a rate of 3-10 DEG C / min and insulating at 260-300 DEG C for 30-120 minutes; increasing the temperature from 260-300 DEG C to 370-390 DEG C at a rate of 2-8 DEG C / min and insulating at 370-390 DEG C for 5-120 minutes. The preparation method has the beneficial effects that the problem that fibers are easy to collapse during sintering of a polytetrafluoroethylene precursor film is well solved; a reticular film with bead-like superfine fibers is obtained; the fibers adhere to each other instead of being stacked out of order; the fibers have uniform morphologies, intact surfaces and greatly improved strength and tenacity and can bear a certain vacuum pressure.

The invention provides a polypyrrole-coated cattail velvet-based ultra-light biomass porous foam, a preparation method and application thereof. In the present invention, cattail velvet is subjected to alkali treatment, and then through the cross-linking reaction of tannin and polyvinyl alcohol, the cattail velvet is fixed and does not collapse in water, and it is freeze-dried to prepare cattail velvet-based ultra-light biomass porous foam and then coated with polypyrrole generated by in-situ polymerization to obtain polypyrrole-coated cattail velvet-based ultra-light biomass porous foam. Through the above method, the present invention can make the prepared cattail velvet-based ultra-light biomass porous foam stable and non-collapsing, and has a consistent graded channel, and promotes the effective coating of polypyrrole, thereby effectively improving its salt resistance and enhancing light and heat. Conversion efficiency, polypyrrole-coated cattail velvet-based ultralight biomass porous foam with excellent salt tolerance and high energy conversion efficiency, so that it can be used as a photothermal material in a solar steam generation system.

The invention provides a preparation method of a polytetrafluoroethylene film. The preparation method of the polytetrafluoroethylene film comprises the steps of preparing a spinning solution, making afiber and sintering. The preparation method is characterized in that a fiber forming carrier and a solvent are prepared into a solution, the solution is added into a polytetrafluoroethylene emulsion,the fiber forming carrier is gelatin, and the solvent is water; sectional continuous sintering is adopted through programmed temperature control, the heat is preserved at the temperature of 90-120 DEG C for 30-120 minutes under the flowing atmosphere, the temperature is raised from 90-120 DEG C to 260-300 DEG C at the speed of 3-10 DEG C per minute, and the heat is preserved at the temperature of260-300 DEG C for 30-120 minutes; the temperature is raised from 260-300 DEG C to 370-390 DEG C at the speed of 2-8 DEG C per minute, and the heat is preserved at the temperature of 370-390 DEG C for5-120 minutes; and the thickness of the polytetrafluoroethylene film is 170-212 [mu]m. The preparation method excellently solves the problem that a fiber collapses easily in the sintering of a polytetrafluoroethylene precursor film, a beaded superfine fiber network film is obtained, the state of the fibers is changed from disordered stacking to mutual adhesion, the fiber morphology is uniform, the surface is complete, the strength and the tenacity are also greatly improved, and the film can bear certain vacuum pressure.

The invention provides a preparation method of a polytetrafluoroethylene film. The preparation method comprises the steps of preparing fibers with a fiber forming carrier and sintering and is characterized by adopting multistep continuous sintering through program temperature control, and in flowing atmospheres, insulating at 90-120 DEG C for 30-120 minutes, increasing the temperature from 90-120 DEG C to 260-300 DEG C at a rate of 3-10 DEG C / min and insulating at 260-300 DEG C for 30-120 minutes; increasing the temperature from 260-300 DEG C to 370-390 DEG C at a rate of 2-8 DEG C / min and insulating at 370-390 DEG C for 5-120 minutes. The preparation method has the beneficial effects that the problem that fibers are easy to collapse during sintering of a polytetrafluoroethylene precursor film is well solved; a reticular film with bead-like superfine fibers is obtained; the fibers adhere to each other instead of being stacked out of order; the fibers have uniform morphologies, intact surfaces and greatly improved strength and tenacity and can bear a certain vacuum pressure.