77results about How to "Achieve chemical bonding" patented technology

The invention relates to a photosensitive PRP (platelet-rich plasma) gel and a preparation method and application thereof. The preparation method comprises the following steps of mixing a biocompatible medium solution of a macromolecule modified by an o-nitrobenzyl photo response group and an extracted PRP according to a certain ratio, so as to form a gel precursor solution; then, radiating the gel precursor solution by light, and enabling the o-nitrobenzyl group in the macromolecule modified by the o-nitrobenzyl photo response group to generate photochemical reaction under the excitation action of a light source, so as to produce an aldehyde functional group; generating coupling reaction with amino distributed at the surface of the protein in the PRP to form an imine bond, so as to realize the preparation of the photosensitive PRP gel. Compared with the prior art, the photosensitive PRP gel prepared by the method has the advantages that the internal cell factors can be slowly released, and the tight and seamless bonding between the PRP gel and wounds is realized.

The invention relates to a method for preparing non-sintered ceramic preform composite materials, and belongs to the technical field of composite materials. The method includes uniformly mixing ceramic micro-powder and adhesive with each other to obtain mixtures A; adding ceramic particles into the mixtures A, uniformly mixing the ceramic particles and the mixtures A with one another and carrying out preparation molding and dehydration treatment to obtain ceramic preforms; pouring metal matrix liquid on the ceramic preforms to obtain the ceramic preform composite materials. The method has the advantages that spatial distribution structures of the ceramic particles, in metal matrixes, of the ceramic particle enhancement metal-based composite materials prepared by the aid of the method can be designed as needed, metal liquid can be advantageously subjected to cast-infiltration in the ceramic preforms, binding of the ceramic particles in the obtained non-sintered ceramic preform composite materials and the metal matrixes can be improved, the abrasion resistance can be improved, and accordingly the service lives of the non-sintered ceramic preform composite materials can be prolonged.

The invention discloses a thermal insulation silicon dioxide aerogel/hydroxylation glass fiber felt composite and a preparation method thereof. The thermal insulation silicon dioxide aerogel/hydroxylation glass fiber felt composite is characterized in that silicon dioxide aerogel accounts for 50-80 weight parts of a matrix, and hydroxylation glass fiber felt accounts for 70-120 weight parts of a reinforcing body. The thermal insulation silicon dioxide aerogel/hydroxylation glass fiber felt composite is prepared by preparing a silica sol system of an MQ structure (M represents (CH3)3SiO1/2, Q represents SiO4/2) through raw materials including absolute ethyl alcohol, deionized water, hexamethyldisiloxane and the like under the acid catalysis environment, then adding gel catalysts, submerging preprocessed glass fiber in the silica sol system to form a wet gel and fiber felt composite, conducting soaking through normal hexane after ageing is conducted for 12-24 h so that water in the system can be removed, and conducting drying to obtain the silicon dioxide aerogel/hydroxylation glass fiber felt composite at temperature of 50-120 DEG C and pressure of 0.01-5 Pa for 1-5 h.

The invention discloses a polycarboxylate superplasticizer with high water retention and a preparation method thereof. The polycarboxylate superplasticizer with high water retention is prepared from, by weight, 100 parts of TPEG, 8.3-12.5 parts of MPEG-MA, 10.1-11.2 parts of unsaturated carboxylic acid, 0.8-1.4 parts of organosilicone monomer, 0.7-1.1 parts of an oxidizing agent, 0.2-0.3 part of a reducing agent, 0.3-0.4 part of a chain transfer agent, 163-172 parts of deionized water and liquid alkali for making pH to 5.5-6. The polycarboxylate superplasticizer with high water retention has high slump under the condition of low dosage, workability of concrete can be improved, and water-retention and tackifying effects are achieved. Meanwhile, reaction condition is suitable, the reaction is normal-temperature reaction without heat source, and the technology is concise, environmentally friendly and highly efficient and is suitable for a large-scale industrial production method.

The invention provides a modified cyanate ester resin surface film and a preparation method thereof, relates to a resin surface film and a preparation method thereof, and solves the problems that an existing epoxy composite surface film and cyanate ester resin prepreg are not matched well, as a result, the curing temperature is inconsistent, the long-term working service temperature is low, the dielectric property of a workpiece cannot meet the standard and the like. The cyanate ester resin surface film comprises cyanate ester resin, a polymerization process modifier, a toughening modifier, a curing accelerator, a coupling agent, inorganic filler, UV (ultraviolet) stabilizer and a carrier. The preparation method of the cyanate ester resin surface film comprises steps as follows: cyanate ester resin and the modifier are kneaded, and copolymerized and modified cyanate ester resin is obtained; the toughening modifier, the coupling agent, the inorganic filler and the UV stabilizer are added and mixed, and a modified cyanate ester resin surface film adhesive is obtained; a three-roller rotating coating film making machine is adopted for film forming. The modified cyanate ester resin surface film is used for improving the surface quality of a cyanate ester resin composite structural member.

The invention provides a high-temperature ceramic/metal riveting-glass sealing combination connection method and relates to a connection method of high-temperature ceramic/metal. The connection method solves the technical problems of poor joint intensity and low usage temperature of a present connection method when a high-temperature ceramic/metal structural member has a large size. The method comprises steps: first, pretreatment of ceramic and metal is carried out; second, glass sealants and binders are mixed and stirred, and coating is carried out; third, assembling, nail placing and rivet application are carried out; fourth, the product is placed in an electric resistance furnace for thermal insulation. Glass systems with different ratios are selected as sealing materials according to different ceramic/metal and usage temperatures. The glass sealants can match ceramic and metal in the thermal expansion coefficients, and can keep certain viscosity during high temperature usage, and high-temperature high-reliability sealing connection of ceramic/metal connection members is achieved. The connection method is used for obtaining high-temperature ceramic/metal riveting-glass sealing combination high-reliability connection.

The invention relates to a preparation method for a silicon-based negative electrode material with a secondary cluster structure and used for a lithium ion battery. In a preparation process of a Si@SiO<2> cluster, a solvothermal method is adopted; a compound is generated on the surfaces of Si@SiO<2> particles in an in-situ manner to realize chemical bonding between the Si@SiO<2> particles, so that the bonding force between the Si@SiO<2> particles in the Si@SiO<2> cluster is greatly improved; in addition, subsequent high-temperature heat treatment is not needed, so that production cost is lowered; and in addition, the surface of the Si@SiO<2> cluster is further coated with carbon, and hydrofluoric acid treatment is carried out to obtain the material with the secondary cluster structure, wherein the material has high cycling performance and rate capability.

The invention discloses a preparation method of a porous BN/Si3N4 composite ceramic hole sealing layer. The invention relates to a surface hole sealing technology of porous BN/Si3N4 composite ceramic. The problems that the existing porous BN/Si3N4 composite wave-transmitting ceramic hole sealing layer material is large in effect on the dielectric property of the overall material and high temperature operating requirements are hard to meet are solved. The method comprises the following steps: 1, weighing the raw materials according to the ratio; 2, preparing hole sealing slurry; 3, preparing a hole sealing layer by adopting a vacuum impregnation method; 4, carrying out drying treatment and thermal treatment. The preparation method disclosed by the invention is simple in technology, and uniform and compact in thickness of the hole sealing layer; the hole sealing layer is formed by Si3N4 and Si2N2O composite ceramics; the control on phase composition of the hole sealing layer can be achieved by controlling the ratio of the Si3N4 to the SiO2; the porous BN/Si3N4 composite ceramic subjected to hole sealing treatment can be used as bearing, wave-transparent and thermal protection materials, and can be applied to the fields of aerospace and mechanical industry.

The invention relates to a preparation method of an attapulgite/ fluorinated polyurethane nanocomposite. The method comprises the steps of firstly, carrying out pretreatment on attapulgite, specifically, dispersing the attapulgite into deionized water, adding a dispersing agent-sodium hexametaphosphate into the deionized water, stirring and then centrifuging, drying and then grinding, acidizing the purified attapulgite, and then carrying out centrifugal drying and sieving; secondly, carrying out organic modification on the attapulgite, specifically, firstly hydrolyzing a silane coupling agent KH550, then adding alcohol and the pretreated attapulgite, carrying out a reflux reaction and then filtering, drying the obtained filter cake, grinding and sieving to obtain modified attapulgite; finally, evenly mixing fluorinated polyether polyol and the modified attapulgite in a nitrogen atmosphere condition, then adding isocyanate into the mixture, heating, carrying out a reaction and then vacuumizing, removing bubbles, adding a chain extender-triethanolamine, stirring and then molding by vacuum solidification. The preparation method is mild in conditions, simple and convenient in operation, easy in control of conditions and low in cost.

This is the method of improving the thermal stability of organosilicon resin adopting polyhedral oligomeric silsesquioxane (POSS). It relates to a kind of method of improving the thermal stability of organosilicon resin. The invention solves the problem of reducing the wave-transmissivity of the organosilicon resin by all the methods that changes the structure of the pendent groups of polysiloxane or changes the structure of main chain or adds thermostable padding to improve the thermal stability of the organosilicon resin. It includes following steps: a. adopt methyl methoxy silane monomer as raw material, prepare organosilicon resin through hydrolyzation and polyesterification reaction; b. add alcohol solvent into the prepared organosilicon resin to prepare the organosilicon resin with alcohol as solvent; besides it also includes Step c.: add 0.5 -10% POSS of the weight of the organosilicon resin into the organosilicon resin produced in Step b., the reaction temperature is 60 -90 Deg. C, the reaction time is 4 -8 hours, and vacuum membrane distillation. The modified organosilicon resin produced by the method has high heat-resisting performance.

The invention discloses a room temperature self-crosslinking type PUA-SiO2 hybrid emulsion and a preparation method thereof. The hybrid emulsion consists of a core-shell type waterborne polyurethane-polyacrylate copolymer, functional nanosilicon dioxide and water. Different from traditional blend doping, the PUA-SiO2 hybrid emulsion disclosed by the invention realizes filler reinforcing through chemical bonding generated by self-crosslinking. In the film-forming stage of the hybrid emulsion, a firm organic-inorganic hybrid network is formed among organic and inorganic components through coupled reactions of acetylacetic ester units and primary amines, so that the hybrid emulsion has the excellent characteristics of high film hardness, scratch resistance, water resistance, chemical product resistance, heat resistance and the like. The hybrid emulsion is applicable for high-performance water-based coatings, and is particularly applicable for product preparation of water-based wood coatings.

The invention relates to the technical field of pressure-sensitive adhesives, in particular to a UV-LED curing modified acrylate pressure-sensitive adhesive and a preparation method thereof. The pressure-sensitive adhesive comprises the following components in percentage by mass: 20%-60% of acrylate monomer diluent, 1%-4% of photoinitiator and 36%-79% of modified acrylate pressure-sensitive prepolymer, wherein the modified acrylate pressure-sensitive prepolymer is prepared by polymerizing various acrylate monomers terminated by hydrogenated rosin glyceride, hydrogenated rosin glyceride tackifying resin is introduced into a molecular chain of the modified acrylate pressure-sensitive prepolymer to obtain the acrylate pressure-sensitive adhesive with a self-tackifying effect, and the initialadhesion and peel strength of the acrylate pressure-sensitive adhesive are obviously improved; the pressure-sensitive adhesive prepared from the prepolymer has good light aging resistance and high temperature resistance, can be used for preparing an optical pressure-sensitive adhesive with the light transmittance of more than 90%, and satisfies the use requirements of electronic products on the optical pressure-sensitive adhesive. No water or organic solvent participates in the whole production process of the pressure-sensitive adhesive, and the purposes of low energy consumption, safety and environmental protection are achieved.

The invention provides a tantalum atom doped bioactive ceramic coating prepared on a titanium alloy surface and a preparation method thereof, and belongs to the technical field of surface modificationof metal materials. The invention provides a method for preparing a functional element tantalum (Ta) doped bioactive ceramic coating on the surface of a medical titanium alloy by a sol-gel-micro-arcoxidation method. The method is characterized in that tantalum oxide containing sol is dipped to uniformly coat the surface of the titanium alloy by a sol-gel method, and then the high spark dischargeeffect of micro-arc oxidation is utilized to further improve so as to form a dense ceramic film on the sol-gel layer on the surface, and thus the coating is prevented from separating. The Ta-containing coating prepared by the method is uniformly distributed on the surface of the titanium alloy, so that the adhesion and multiplication of osteoblast can be improved, and as a result, the bioactivityof the titanium alloy can be improved; and the method has a good application prospect in the field of medical implant materials

The invention discloses a high-water-reducing high-adaptability polycarboxylate superplasticizer and a preparation method thereof. The polycarboxylate superplasticizer is prepared by polymerizing fivemonomers including allyl polyether, acrylic acid, maleic anhydride, vinyltriethoxysilane and sodium methylallyl sulfonate, and introducing an adaptive accelerant at the same time. The polycarboxylatesuperplasticizer provided by the invention has excellent adaptability to mixtures and gravels in various kinds of cement, and also has a relatively high water reducing rate. The preparation method issimple to operate, mild in condition and beneficial to large-scale production.

The invention provides paint for preparing an aluminum phosphate coating on the surface of an aluminum alloy and a use method of the paint. The paint comprises the following raw materials, by weight, 10-70 parts of Al(H2PO4)3, 30-80 parts of pure water, 1.1-1.3 times of the total chemical reaction required amount of pure water and Al(H2PO4)3 of Al2O3 powder. The use method of the paint comprises the following steps: 1) the raw materials are weighed proportionally, and are mixed uniformly and the paint is obtained; 2) an aluminum alloy sample is placed in an alkaline solution for alkaline washing, and then is washed with the pure water, finally the aluminum alloy sample is subjected to natural drying for use; and 3) the surface of the dried aluminum alloy is coated with the paint, then the aluminum alloy is placed in a water vapor environment, and an aluminum alloy casting provided with the aluminum phosphate coating is obtained. The aluminum phosphate coating can be formed on the surface of the aluminum alloy, the corrosion resistance of the aluminum alloy can be improved, the technical treatment temperature is lower than the aging heat treatment temperature usually used for the aluminum alloy, and the use method can act as a final treatment technology to be applied to product production.

The invention relates to composite materials for prosthesis materials, in particular to a double in-situ synthesis method for preparing carbon nano tube reinforced hydroxyapatite composite materials. The method comprises the steps that 1, in-situ synthesis of carbon nano tube-hydroxyapatite in-situ mixed powder is carried out; 2, double in-situ synthesis of carbon nano tube-hydroxyapatite in-situ composite powder is carried out; 3, the carbon nano tube reinforced hydroxyapatite composite materials are prepared. On the basis of preparing the carbon nano tube-hydroxyapatite in-situ composite powder, a hydroxyapatite layer which is dense in coating and controllable in structure is synthesized on the surface of the carbon nano tube through a sol-gel process, the carbon nano tube reinforced hydroxyapatite composite materials are prepared, the prefect structure of a carbon nano tube and the good biocompatibility of the hydroxyapatite composite materials are both achieved, meanwhile, the dispersion effect of the carbon nano tube and the interface combination effect are obviously improved, the carbon nano tube reinforced hydroxyapatite composite materials with the excellent mechanical property and the biocompatibility are made, and the carbon nano tube reinforced hydroxyapatite composite materials are widely applied to the bio-medical field.