47results about How to "Improve heat and humidity stability" patented technology

The invention relates to an acrylics/ SiO2 nano-composite tanning agent. The nano-composite tanning agent appears to be light yellow or yellow semitransparent ropy liquid, the mass concentration is 20 to 35%, the viscosity is 500 to 1000MPa.s, the pH value is 5 to 8, and the storage stable period is over 12 months. With only 2% (relative to the leather weight) chromium powder, the nano-composite tanning agent can thicken the leather by 124.5%, the shrinkage temperature reaches to 95 DEG C.; compared with a chrome tanned leather, a leather tanned by the nano-composite tanning agent has a tensile strength, peeling strength and elongation at break improved by 51.8%, 8.2% and 13.3% respectively, has no obvious stratification or sedimentation during over 12 months of storage period. Water is used as solvent when prepared, which is low-cost and pollution-free; the preparing technology is simple, the reaction is mild, the polymerization process is easy to control, so that the nano-composite tanning agent is easy to realize industrial production, the synthesized material is inexpensive and easy to obtain as well.

The invention discloses a transparent conductive film with a single layer structure, a preparation method and application thereof. The preparation includes: putting a cleaned substrate into a vacuum chamber of a vacuum magnetron sputtering device, filling argon when the vacuum degree of the chamber is 1*10<-4>-7*10<-4>Pa, and controlling the total air pressure at 0.16Pa, adjusting the sputtering power of a target material to 10-60W, then opening a sample baffle plate, and employing direct current magnetron sputtering technique for deposition on the substrate surface to obtain the transparent conductive film. The transparent conductive film is composed of silver and a metal oxide. By direct sputtering of an alloy target composed of silver and the metal oxide or co-sputtering of silver and ametal oxide target, the transparent metal conductive film with good continuity and stability under a small thickness can be prepared, thereby reaching the purposes of lowering the structural complexity and reducing material consumption.

The invention relates to a method for preparing a nano-composite simultaneously containing montmorillonite and silica particles, in particular to a method for preparing nano-composite tanning agent simultaneously containing montmorillonite and silica particles by using an in-situ polymerization method. The chrome tanning agent is one of the most commonly-used tanning agent in the leather industry, however, chromium (VI) has the problems of high toxicity and environmental pollution. By introducing acrylic monomers, the nano-composite tanning agent simultaneously containing montmorillonite and silica particles is prepared from montmorillonite and nano-particles with the surface thereof containing double-bond silica by using the in-situ polymerization method. By using the nano-composite tanning agent (6%) prepared by the invention to tan pickled goat skin, the resistance of crust leather to wet heat can be increased to plus of minus 75 DEG C; and the crust leather is superior in other properties, thereby meeting the requirements for the production of wet white leather and reducing the consumption of chrome tanning agent.

The invention provides a hybrid cross-linked porous membrane of highly bionic bone matrix for skull repair, which is composed of a three-dimensional network of double cross-linked polymer and micron spherical hydroxyapatite uniformly distributed therein. The three-dimensional network of double cross-linked polymer is formed by oxidization and self-crosslinking of polymer materials with carboxyl and catechol functional groups, and Michael addition reaction of the polymer materials with carboxyl and catechol functional groups and the polymer materials with amino and carboxyl, and phenolic hydroxyl groups on the polymer materials with carboxyl and catechol functional groups chelated with calcium ions dissociated from the micron-sized spherical hydroxyapatite. According to the method, the dispersibility of the hydroxyapatite in the material can be improved, the integration degree of hydroxyapatite and an organic phase is increased, remodeling and regeneration of skull defect can be achieved without exogenous cells or growth factors.

The invention discloses a high-thermal-conductivity composite PCB substrate and a preparation method thereof. The preparation method comprises the following steps: step 1, dispersing a fluorine-containing coupling agent and boron nitride into a good solvent to obtain an impregnation liquid, adjusting the impregnation liquid to be acidic, then immersing glass fiber cloth into the impregnation liquid, taking out the glass fiber cloth from the impregnation liquid, carrying out alkali treatment, and drying to obtain boron nitride/glass fiber composite cloth; and step 2, dipping the boron nitride/glass fiber composite cloth in a polytetrafluoroethylene glue solution, drying to obtain a boron nitride/glass fiber/polytetrafluoroethylene prepreg, and carrying out curing treatment on the multilayerboron nitride/glass fiber/polytetrafluoroethylene prepreg to obtain the composite PCB substrate. The method is suitable for large-scale production of the high-thermal-conductivity PCB substrate for high-frequency and high-speed data transmission, and has important practical significance and popularization value in the field of high-frequency and high-speed PCB substrates.

The invention discloses an article of one-piece electromagnetic radiation protection clothing for aircrew. The one-piece electromagnetic radiation protection clothing for the aircrew comprises a hat, a jacket and a pair of trousers and is characterized in that the hat, jacket and trousers are connected into one piece, the front fly of the jacket is opened to the crotch of the trousers from the chest of the jacket, sleeve tabs are arranged at the cuffs of the jacket, leg opening tabs are arranged at the trouser legs of the trousers, and a pair of protective gloves and a pair of protective socks are arranged for using with the protection clothing. The one-piece electromagnetic radiation protection clothing for the aircrew has high/low temperature stability, wet-hot stability, sweat corrosion stability and excellent washing resistance. The one-piece electromagnetic radiation protection clothing for the aircrew is capable of resisting bacteria, dust, static electricity and the like, and each suit of protection clothing is less than or equal to 2.0 kilograms in weight, small in volume and flat.

The invention relates to a method for preparing a CsPbI3 perovskite thin film and a high-efficiency perovskite solar cell in a high-humidity environment and application, and belongs to the field of optoelectronic materials and devices. According to preparation of the full-inorganic CsPbI3 thin film, a precursor solution with methylamine acetate as a solvent is spin-coated on an FTO conductive substrate with an electron transport layer by adopting a hot spin-coating technology, a compact and uniform perovskite thin film is prepared through gradient annealing, and the whole process is completed in air with the relative humidity of 40%-80%. And then spin-coating an interface modification layer and Spiro-OMeTAD on the thin film as a hole transport layer, and evaporating a MoO3 modification layer and a metal electrode by using a vacuum evaporation technology to complete the preparation of the device. The CsPbI3 all-inorganic perovskite solar cell prepared by the method in high-humidity air has excellent photoelectric conversion efficiency.

The invention discloses a composition for packaging a photoelectric device. The composition comprises the following components in percentage by mass: 90 to 100 percent of a mixture of esterified aromatic phenol and epoxy resin, 0.1 to 2 percent of a catalyst, 0.2 to 2 percent of a coupling agent, 0.1 to 0.5 percent of an anti-aging agent, 0.1 to 0.5 percent of a colorant and 10 to 90 percent of a filler, wherein the equivalence ratio of the esterified aromatic phenol and the epoxy resin in the mixture of the esterified aromatic phenol and epoxy resin is 0.8 to 1.2. According to the composition for packaging the photoelectric device, the aromatic phenol resin with an esterified structure is combined with the epoxy resin and the other components, so that a cured material with undamaged heat resistance and light fastness can be formed, and the toughness, damp-heat resistance stability (particularly reliability of reflow soldering, damp-heat and salt-fog resistance), sealing performance and crack resistance of the cured material are relatively high.

The invention discloses a surface-functionalized spheroidal nano SiO2-graphene oxide/polymer-based compound tanning agent and a preparation method of the surface-functionalized spheroidal nano SiO2-graphene oxide/polymer-based compound tanning agent. The prepared novel nano compound tanning agent is good in solubleness in a water phase and is quite beneficial to permeation and absorption of tanning agent molecules. The spherical nano compound tanning agent can more easily permeate in and fill in gaps of leather collagen fibers under the effect of mechanical force of a revolving drum due to small friction resistance. When the tanning agent is used for tanning sheep wet white leather, the thickening rate of the leather can reach 189%, and the leather utilization rate is greatly improved. Theshrinkage temperature of the tanned leather can reach 80 DEG C or above, after compounding of 0.5% chrome tanning, the shrinkage temperature can reach 95 DEG C or above, hydrothermal stability of theleather is remarkably improved, and the requirement for using performance of the finished leather is met. The tanned leather has the certain electrical resistance and fire resistance. The novel nanocompound tanning agent can partially replace chrome tanning, and a novel thought and a novel method are provided for clean chrome-free tanning research.

The invention discloses a preparation method of a retanning agent. The preparation method comprises the following steps: modifying a dialdehyde monomer to obtain partially sulfonated dialdehyde; thensubjecting the partially sulfonated dialdehyde to a nucleophilic addition reaction with an amino monomer so as to generate an amino resin prepolymer containing a sulfonic acid group; and adding an etherifying agent to seal free aldehyde groups so as to obtain the amino resin retanning agent, wherein a molar ratio of primary amino groups in the amino monomer to the aldehyde groups in a dialdehyde monomer is 1: 1.3 to 1: 3, and the proportion of unreacted aldehyde groups in the partially sulfonated dialdehyde is 40%-90%. The invention further provides the retanning agent and application thereof.According to the preparation method disclosed by the invention, the water solubility and dispersity of the amino resin prepolymer and the retanning agent product are improved, so the retanning agentis good in quality and high in comprehensive performance, and the retanning performance of the retanning agent is comparable with the retanning performance of a traditional amino resin retanning agent.