39results about How to "Overcome the disadvantages of poor mechanical properties" patented technology

The invention discloses a preparation method of a modified diaphragm for a lithium-ion secondary battery as well as a prepared modified diaphragm and a preparation device and is aimed to solve the problem of lithium battery modified diaphragms in the prior art. The method concretely comprises the following steps of: (1), evenly dispersing special fiber or oxide and a binder into an organic solvent to prepare composite mixed liquid, and adding a cosolvent into the organic solvent; (2) evenly spraying the composite mixed liquid obtained in the step (1) on a polyolefin base membrane to form a primary composite membrane through an electrostatic spinning method; and (3), drying the primary composite membrane obtained in the step (2) and recycling the solvent, and then finally obtaining the finished product. The preparation method is convenient to operate and environmental friendly, can realize large-scale production and has strong feasibility.

The invention belongs to the technical field of membranes and in particular relates to a porous material-polymer gas separation composite membrane. The composite membrane comprises a separation layer and a supporting layer, wherein a porous material-polymer hybrid membrane is adopted as the separation layer; one of a porous flat plate and a tubular or hollow fiber membrane is adopted as the supporting layer; the porous material of the separation layer is metal-organic frame materials (MOFs) with large specific surface area and high gas adsorption. The MOFs are added into the separation layer so that the gas permeation and selectivity of the membrane are obviously improved; the separation layer and the supporting layer are compounded so that the membrane keeps good mechanical property, and the separation layer is allowed to exist in a compact or asymmetric structure. The composite membrane provided by the invention has high gas separation property, good mechanical property and wide industrial application prospect.

The invention discloses water-based wood paint modified by vegetable oil and a preparation method of the water-based wood paint. The water-based wood paint is prepared from, by weight, 60-85 parts of aliphatic series modified polyurethane dispersoid, 1-3 parts of hardness-enhancing resin, 7-12 parts of water, 1-3 parts of wax emulsion, 2-5 parts of coalescing agents, 0.2-0.7 part of wetting dispersant, 0.1-0.5 part of flatting agents, 0.2-0.7 part of deforming agents, 1-2 parts of antifreezing agents and 0.3-0.7 part of thickening agents. According to the water-based wood paint modified by the vegetable oil and the preparation method of the water-based wood paint, formula adjustment is utilized, the environment-friendly type water-based hardness-enhancing resin is matched, and the hardness-enhancing resin comprises solvent-free water-based modified aldehyde ketone resin dispersoid. The water-based wood paint can reach or exceeds oil-based wood paint in physical and chemical technical index, and all comprehensive properties are excellent.

The invention belongs to the field of lignin-based hydrogel functional materials and discloses double-network lignin hydrogel as well as a preparation method and application thereof. The preparation method disclosed by the invention comprises the following steps: constructing a first network lignin hydrogel system in an alkaline solution by virtue of chemical cross-linking, and soaking the first network lignin hydrogel in an acidic solution, and producing a hydrophobic effect by utilizing lignin in the first network, thereby forming the double-network lignin hydrogel. The double-network ligninhydrogel prepared by the method has high mechanical strength, and the preparation method is simple, low in raw material cost, reproducible, green and environment-friendly. Moreover, the double-network lignin hydrogel has high ionic conductivity, and when the hydrogel serves as electrolyte for assembling a supercapacitor, extra ionic solution soaking is not needed, use of an extra diaphragm is notneeded, and the thickness and weight of the supercapacitor are effectively reduced. The specific capacitance value of the obtained capacitor is higher than the specific capacitance value of a conventional hydrogel electrolyte type flexible supercapacitor. In addition, the double-network lignin hydrogel has excellent charge and discharge cycle stability, compression resistance and bending resistance.

The invention which belongs to the material preparation field discloses an aliphatic/aromatic copolyester and a preparation method thereof. According to the aliphatic/aromatic copolyester, the molecular weight is greater than 20000, the ultimate strength is greater than 10MPa and lower than 60MPa, the breaking elongation rate is greater than 5% and lower than 3000%, Tg is greater than -70DEG C and lower than 40DEG C, Tm is greater than 50DEG C and lower than 270DEG C, and the biodegradation rate is greater than 30%. According to the preparation method of the aliphatic/aromatic copolyester, fusion polycondensation and ring opening polymerization are simultaneously carried out on an aromatic polyester monomer and an annular aliphatic polyester monomer in the presence of a catalyst to obtain the aliphatic/aromatic copolyester with irregularly distributed aromatic units and aliphatic units. The aliphatic/aromatic copolyester has the advantages of excellent mechanical performance, high molecular weight, realization of the complete biodegradation, and the like.

The invention provides a quick-molding self-healing hydrogel and a preparation method thereof. The preparation method comprises the following steps: by taking polyvinyl alcohol as a raw material, firstly, reacting the polyvinyl alcohol with glycidyl methacrylate to synthesize methacrylated polyvinyl alcohol, and then, carrying out esterification reaction on carboxyl on succinic anhydride and hydroxyl on the methacrylated polyvinyl alcohol to prepare carboxylated methacrylated polyvinyl alcohol; preparing a precursor mixed solution, mixing the precursor mixed solution with an iron tartrate solution containing ferric ions, and carrying out ultraviolet polymerization molding to prepare the quick-molding self-healing hydrogel with a physicochemical double-crosslinked single-network structure.The hydrogel has the advantages of being high in forming speed and excellent in self-healing performance, and has excellent mechanical properties.

The invention belongs to the technical field of chemical separation and environmental protection, and relates to a preparation method for a hydrophilic oil-water separation membrane imitating a cobwebstructure. The preparation method comprises the steps that multi-walled carbon nanotubes which are mutually intertwined are broken through inorganic acid at high temperature so as to obtain multi-walled carbon nanotube dispersion liquid, centrifuging and separating are carried out, and then supernate is taken; and 2-5 g of super-long MnO2 nanowires are added into per liter of water, mixed suspension liquid is stirred for 5-24 hours, the multi-walled carbon nanotube dispersion liquid and the super-long MnO2 nanowire dispersion liquid are mixed according to the volume ratio of 1:3-5:1 and thenare stirred, finally the multi-walled carbon nanotube/super-long MnO2 nanowire mixed solution is subjected to vacuum filtration in a vacuum filtration device with a commercial filtration membrane fixed so as to obtain a oil-water separation membrane imitating the cobweb structure, a hydrophilic filter membrane is peeled off, and drying is carried out so as to obtain the hydrophilic oil-water separation membrane imitating the cobweb structure. According to the preparation method, the super-long MnO2 nanowires are mutually intertwined so as to form a large-aperture supporting network, the multi-walled carbon nanotubes and the supporting network are mutually intertwined so as to form a small-aperture network structure, so that the cobweb structure is effectively imitated, and the purpose of enhancing the mechanical strength of the multi-walled carbon nanotube membrane is achieved.

The invention relates to a preparation method of a multi-responsive self-healing self-adhesive hydrogel. According to the invention, polyvinyl alcohol/borax is used as a main body structure of the hydrogel, and bacterial cellulose is added to improve the mechanical properties of the hydrogel. Tannic acid rich in benzenediol groups is used as a monomer for providing hydrogel adhesion, and a quinone structure obtained by oxidation of the tannic acid and an amino group of cystamine dihydrochloride are subjected to a Schiff base or Michael addition reaction to introduce disulfide bonds, so the hydrogel is endowed with redox responsiveness. The hydrogel is prepared through a boric acid ester bond, a hydrogen bond, pi-pi stacking and the like, and the defects that traditional polyvinyl alcohol hydrogel is poor in mechanical property, lack of tissue adhesion and the like are overcome. The hydrogel has good biocompatibility, multiple responsiveness, excellent mechanical property, self-adhesion and the like, so the application range of the hydrogel is expanded.

The invention belongs to the technical field of silicone rubber, and discloses a tracking-resistant silicone rubber, and a preparation method and application thereof, the tracking-resistant silicone rubber is mainly prepared from the following raw materials: polysilazane, a platinum complex, basic silicone rubber, white carbon black, silicone oil and a vulcanizing agent. According to the invention, a small amount of polysilazane and platinum complex is added, and the structural formula of polysilazane is as follows: (R1R2Si-NH) x (R3R4Si-NH) y, x and y are both integers of 0-300, and x and y are not 0 at the same time; R1, R2, R3 and R4 independently represent any one of H, CH3 and CmH2m + 1 respectively, and m is an integer between 1-7; and when the mass ratio of platinum atoms in the total formula raw materials is 5-15 ppm, the tracking resistance of the obtained silicone rubber finished product can reach 1A 4.5 grade, the system compatibility is good, the mechanical property is excellent, and the defect of poor mechanical property of the current tracking-resistant silicone rubber is overcome. The preparation method is simple, raw materials are easy to obtain, the application prospect is good, and thetracking-resistant silicone rubber is suitable for being applied to the field of high-voltage insulation.

The invention discloses a high efficiency and continuous oil-water separation device, and belongs to the technical field of functional material application. The device comprises an oil collecting tank, a mechanical pump and an oil collecting device. The collecting tank is of a cube frame structure, metal substrate loaded with hydrophobic film is fixed on five surfaces of the cube frame, the five surfaces of the cube frame are in full contact with the oil and water mixture, and the sixth surface is an opening. The oil inlet of the mechanical pump is connected with the oil collecting tank through a pipeline, the oil outlet of the mechanical pump is connected with the oil collecting device through a pipeline. The high efficiency and continuous oil-water separation device overcomes such defects of polymer membrane that the processing amount is small, the separation speed is slow, and the wastewater can only be processed in batches. The continuous separation of oily wastewater can be conducted, and the high efficiency and continuous oil-water separation device provides a possibility of the application of membrane separation technology in oily wastewater treatment in actual life.

The invention belongs to the field of supercapacitors and discloses a flexible and solid supercapacitor, a preparation method and application thereof. The supercapacitor comprises a positive electrode, a negative electrode and an electrolyte interposed therebetween, wherein the electrolyte is double-network lignin hydrogel, and both the positive and negative electrodes are conductive electrodes. The double-network lignin hydrogel as the electrolyte in the present invention not only has high mechanical strength property, but also has a simple preparation method, low raw material cost, renewability, green environmental protection, and high ionic conductivity; when the hydrogel is used as the electrolyte to assemble the supercapacitor, additional soaking of an ionic solution is not required and additional use of a diaphragm is not needed, thereby effectively reducing the thickness and weight of the supercapacitor. The obtained capacitor specific capacitance value is higher than the current hydrogel electrolyte type flexible supercapacitor specific capacitance value. In addition, the supercapacitor has very good charging and discharging cycle stability, compression resistance and bending resistance.

A sponge pavement and a preparation method thereof are provided, wherein the preparation method comprises the following steps: preparing a permeable concrete base layer; preparing a high-porosity titanium cement layer on the water-permeable concrete base layer, wherein the method for preparing the titanium cement comprises adding phosphate and dispersant to titanium salt aqueous solution, adding Portland cement, stirring, adding foaming agent and foam stabilizer after forming slurry, and fully stirring to form the titanium cement layer with high porosity on the base layer of the water-permeable concrete; forming a photocatalyst spraying layer of titanium dioxide on the titanium cement layer with high porosity. The preparation method of the sponge pavement overcomes the shortcomings of poormechanical properties of the permeable concrete and the shortcomings of the prior photocatalyst such as low photocatalytic degradation efficiency of VOC and NOx, short lasting time, etc., improves the retention amount and depth of the photocatalyst spraying, and obviously improves the long-term efficiency of the photocatalyst catalysis effect.

The invention relates to the technical field of the polyurethane foam hard plastics, and more specifically relates to a polyurethane hard plastic foam composition. The polyurethane hard plastic foam composition provided by the invention is composed of the following main raw materials in parts by weight: 75-90 parts of combined polyether, 2-5 parts of dimethyl ether, 2-5 parts of glass fibers, 4-10 parts of mullite and 2-5 parts of silicon carbide fine powder. The polyurethane hard plastic foam composition is capable of overcoming the shortcoming of poor mechanical properties of the existing polyurethane hard foam plastic, and has excellent strength and tenacity in addition to the previous properties such as high temperature resistance and fire resistance.

The invention relates to a modification method of collagen.The modification method comprises the following steps that 1, the collagen is dissolved into an acetate solution to prepare a saturated collagen solution; 2, a proteolytic enzyme is added into the saturated collagen solution, and reacting under heating is performed for 1-3 hours at the temperature of 40 DEG C-50 DEG C; 3, a chitosan acetic acid solution and a catalyst are added into a product generated in the step 2, and reacting under heating is performed for 0.5-2 hours at the temperature of 40 DEG C-50 DEG C, wherein the catalyst is prepared from, by mass, 15%-25% of Sm2O3, 25%-35% Eu2O3 and 45%-60% Gd2O3.By adding the chitosan acetic acid solution and the catalyst into the saturated collagen solution generated through reacting of the proteolytic enzyme, the collagen reacts with the chitosan acetic acid to generate a crosslinking substance, therefore, the jelly strength of the collagen is improved, the defect that the mechanical property of the collagen is poor is overcome, and the collagen can be applied to the food and medicine fields.

The invention discloses a preparation method of collagen polypeptide nano-sphere grafted hydration titanium oxide adsorption material, which comprises the following steps of: crushing and hydrolyzingthe waste collagen of tanning to obtain the hydrolyzed collagen polypeptide, taking the hydrolyzed collagen polypeptide and using a gel-sol method to obtain collagen polypeptide nanosphere suspension;adding the collagen polypeptide nano-ball suspension into a container, then adding montmorillonite agent and the titanic acid salt solution, stirring for 2-5 hours, adjusting the pH to 3-4 by using ahomogenizer, sealing the container, placing the container in a shaking table, reacting for 2-5 hours at the temperature of 40-45 DEG C, standing for 1-10h at room temperature, centrifugally separating, removing the supernatant, and freeze-drying the residual to obtain the collagen polypeptide nanospheres grafted hydration titanium oxide adsorption material. The method overcomes the defect that the hydration titanium oxide exhibits poor mechanical property since the application of hydrated titanium oxide in the field of inorganic absorption. The prepared collagen polypeptide nano-ball graftedhydration titanium is used for specific recovery treatment of uranyl ions by utilizing high adsorption capacity and high selectivity of hydrated titanium to uranyl ions.