34results about How to "Fast Mechanical Properties" patented technology

The invention discloses a bamboo bridge deck, which comprises prestressed ribs and a plurality of superposed bridge deck sheets, wherein the prestressed ribs penetrate through the bridge deck sheets; two ends of the prestressed ribs penetrate through shim plates and are fixed and tightened by using anchorage devices to constrain the bridge deck sheets; and each bridge deck sheet is formed by sequentially joggling a plurality of single bridge decks made of bamboo veneers end to end, and the joggled parts of the two adjacent bridge deck sheets are staggered. The required width of the bridge deck is achieved in the transverse direction by the method for sequentially joggling the single bridge decks end to end in the cross section width of a bridge. The basic single decks of the bamboo bridge deck can be conveniently prefabricated in a factory and assembled on site to form the bamboo bridge deck; the construction process is simple and fast, and the construction materials are environment-friendly and are easily reclaimed; and the bamboo bridge deck is suitable for a combined structural bridge, and is a bridge deck capable of meeting the using functions and the durability.

The invention relates to a method for preparing electronic ink from light composite function ball at sub-optical wavelength. Mixing dispersant and organic solvent, oscillating with ultrasonic wave, adding light composite function ball at sub-optical wavelength and blending, thus obtaining light composite function ball suspension at sub-optical wavelength with bistability; then adding background dye and mixing, thus obtaining electrophoretic display liquid, namely the electronic ink; or dispersing the light composite function ball at sub-optical wavelength in organic solvent, oscillating with ultrasonic wave, heating to 105-120 DEG C, adding Tissuemat E gradually and blending, thus obtaining light composite function ball suspension at sub-optical wavelength with bistability; then adding background dye and dispersant and mixing, thus obtaining electrophoretic display liquid, namely the electronic ink. Electronic paper display units made from the electronic ink are of good mechanical property, wear resistance, pressure resistance, impact resistance and quick response, and the images produced have clear boundaries, high contrast grade and high resolution.

The invention discloses a preparation method of phenolic resin used for hand lay-up fiberglass-reinforced plastic. The method comprises the following steps of: (1) adding phenol, polyhydroxy phenol, formaldehyde and a basic catalyst to a reaction kettle at a mol ratio of 1.0:(0.1-1.5):(0.8-2.0):(0.02-1.0), heating to 40-75 DEG C, carrying out reaction at a constant temperature for 2-10 hours, heating to 85-95 DEG C and continuing reacting for 1-5 hours to obtain a mixture; and (2) vacuum-distilling the mixture obtained in step (1) for dewatering to liquid viscosity 5000-10000 MPa.s / 25 DEG C. According to the invention, polyhydroxy phenol with more active hydroxyl groups compared with that of phenol is added during the synthesis process of phenolic resin, thus improving the solidifying speed of phenolic resin, shortening the solidifying time and improving production efficiency under the condition of identical solidifying agent addition amount; and high hydroxyl group content increases crosslinking points and improves mechanical properties of phenolic resin.

The invention relates to a preparation method of super-hydrophobic, super-oleophylic and ultralight sponge. The preparation method comprises two steps of performing functionalized processing on melamine sponge by using an impregnation method and performing a curing reaction after processing. The melamine sponge used by the invention has a large quantity of active functional groups such as hydroxyl groups and amino groups on the surface, the content of the hydrophobic active functional groups on the surface of the sponge is remarkably reduced after the active groups are chemically functionalized, which causes a result that the surface energy of the material is reduced, thus the sponge is endowed with super-hydrophobic and super-oleophylic effects, and a contact angle between the sponge and water exceeds 150 degrees; and the modified melamine sponge belongs to an ultralight material due to density. The method disclosed by the invention has the advantages that raw materials are low in price and easy to available, the process is simple and easy to operate, the large-scale preparation is easily realized, and the like. The sponge prepared according to the preparation method has the advantages of low density, excellent compression resistance, high oil absorbing speed, high oil absorbing rate, high oil and water separation selectivity and the like, is a novel and efficient ultralight-density oil and water separating material, and has a wide application prospect in the fields such as organic chemical reagent treatment, oil-containing wastewater treatment, and leaking crude oil recovery.

The invention provides an assembly type bamboo bridge. The assembly type bamboo bridge consists of bamboo longitudinal beams (1), bamboo transverse beams (2), bamboo panels (3), a transverse pre-stressing tendon (4) and a longitudinal pre-stressing tendon (16). All bamboos used by the assembly type bamboo bridge are soaked in a gum dipping tank which contains polyurethane resin and phenolic resin before being assembled, and boiled for 10-15 minutes at 100 DEG C-110 DEG C, wherein the volume ratio of the polyurethane resin to the phenolic resin is (2-2.5):1; and then, the bamboos are got out and dried, and a layer of waterborne polyurethane resin, a layer of polyurethane resin, a layer of waterborne polyurethane resin and a layer of resurcinolformaldehyde resin are uniformly coated on the outer surfaces of all bamboos in sequence. The assembly type bamboo bridge is large in structural strength, good in drawability, green and environment-friendly in used materials, standard in structural components, high in assembly degree, good in structural integrity, and capable of sufficiently bringing the advantages of the materials into play, and satisfying the normal use and durability needs of the bridge beam structure.

A medical stent for the digestive system, which is obtained by 3D printing of degradable polymer materials. It includes at least two continuous layers of three-dimensional grid structures in the radial direction. The layered three-dimensional grid structure is compositely printed by a degradable polymer main material and at least one degradable polymer sub-material, and the degradable polymer sub-material is completely degraded earlier than the degradable polymer main material, and the inner layer In the three-dimensional grid structure, at least part of the degradable polymer main material is continuous in the axial direction of the entire medical stent and the extension area of ​​the radial section of the inner three-dimensional grid structure is not less than that of the inner three-dimensional grid structure 20% of the total radial cross-sectional area. The present invention manufactures the above-mentioned degradable medical stent by means of 3D printing technology, realizes fine-tuning of mechanical properties, control of drug release and degradation cycle through the planning of primary and secondary materials, and optimizes the overall performance of a more versatile digestive system medical stent.

The invention relates to a gradient porous magnesium-based metal component body for bone tissue engineering, which is characterized in that it at least includes an inner core prefabricated body, a ring-shaped outer layer prefabricated body located on the periphery of the inner core prefabricated body, and an inner inner prefabricated body and an outer layer prefabricated body. Between the ring-shaped middle layer prefabricated body, the core prefabricated body, the middle layer prefabricated body and the outer layer prefabricated body all have pores, and the pores of the three are connected, and the inner core prefabricated body, the middle layer prefabricated body The porosity of the body and the outer prefabricated body decreases sequentially. The invention also relates to a preparation method. After being implanted in the human body, it can meet the different requirements for dynamic matching between degradation rate and mechanical properties in different periods.