65results about How to "Preparation conditions are not harsh" patented technology

The invention relates to a room-temperature curing epoxy structural adhesive composition, which comprises a component A and a component B, wherein the component A comprises bisphenol A epoxy resin, toughness modified bisphenol A epoxy resin, silane coupling agent, thixotropic agent and colorant; and the component B comprises polyamide, polyether amine, a filler and a curing accelerator; the toughness modified bisphenol A epoxy resin is liquid nitrile rubber-modified bisphenol A epoxy resin and / or polymer-toughened bisphenol A epoxy resin with a nuclear shell structure; meanwhile, the invention also provides a method for preparing the room-temperature curing epoxy structural adhesive compositiion. The structural adhesive of the invention has the advantages of good toughness, strong high-temperature strength, short curing time, simple preparation method, and the like.

The invention discloses a hemostat and a preparation method thereof. A finished product liquor per 1000 g comprises 10-16 g of termite fungus garden composition powder, 4-6 g of collagen, 0.02-0.04 g of ternary acid, 7-9 g of bactericidal agent and the balance of water. The invention has the advantages that the termite fungus garden composition powder containing rich nutrient contents is utilizedin the prescription, the functions of detumescence, convergence and hemostasis are achieved, meanwhile the weak body is tonified without any side effect; the collagen has very strong affinity with different cells, and also has ideal affinity with growth factors which play a key role in the process of wound healing, after blood coagulation, the collagen can also prevent bleeding again through stimulating the regeneration and the repair of tissues. The hemostat is not fastidious about the using object, has fast hemostasis effect, excellent functions of anti-inflammatory, detumescence and acesodyne without toxic or side effect, or untoward reaction of stimulations. The preparation method has less technical steps and non-rigorous preparation condition, and can be suitable for the industrial mass production.

The invention discloses a preparation method for Er<3+>-Yb<3+>-co-doped NaYF4 fluorescent powder of which the crystalline phase can be controllably synthesized. The method comprises the following steps that yttrium acetate, ytterbium acetate, erbium acetate and sodium hydroxide are batched and mixed, isopropanol, ethyl alcohol and water serve as solvent, trifluoroacetic acid is added, and transparent sol A is obtained after the mixture is stirred evenly; heat treatment is performed on colloidal matter obtained by drying the transparent sol A, the temperature is increased to 300-800 DEG C from the room temperature, heat preservation is performed for a certain time, and the colloidal matter is cooled to the room temperature along with a furnace and then ground to obtain the Er<3+>-Yb<3+>-co-doped up-conversion fluorescent powder with different crystalline phase compositions and multiple light emitting colors. The preparation method is simple in synthesis technology, short in production cycle and capable of easily achieving scale production; the synthesized Er<3+>-Yb<3+>-co-doped up-conversion fluorescent powder is controllable in crystalline phase, diverse in light emitting colors and wide in application.

The invention discloses a method for preparing 2,3,6-trimethylphenol, and the 2,3,6-trimethylphenol is an important intermediate of vitamin E. The method comprises the following steps of: enabling a mixture of metacresol, methanol and water to pass a fixed bed reactor containing an o-position methylation catalyst in a liquid space velocity of 0.4-10 h<-1>, and preparing the 2,3,6-trimethylphenol by carrying out a gas solid phase catalytic reaction under a temperature of 280-450 DEG C and a pressure of 0-10 MPa, wherein the o-position methylation catalyst consists of iron oxide, silicon dioxide and alkali metal oxide, and in the oxides, the metal ion molar ratio of iron, silicon, aluminum and alkali metal is equal to 100:(0.1-10):(0.2-5):(0-1). According to a catalyst for synthesizing the 2,3,6-trimethylphenol and a preparation method thereof, the conversion rate of the metacresol for compounding the 2,3,6-trimethylphenol is 100%, the yield of the 2,3,6-trimethylphenol is above 99.9%, and the service life of the catalyst is longer than 3000 hours.

The invention aims to solve the technical problems of overcoming the defects of high resistivity, low ductility and poor adhesion between a conductive layer and a basal body of the transparent conductive film in the prior art and provide a novel transparent conductive film and a preparation method thereof. The novel transparent conductive film comprises the following components in percentage by mass: 25-35 percent of hydrogenated bisphenol A epoxy resin, 22-25 percent of epoxy resin active diluting agent, 0.5-1.5 percent of anti-ultraviolet (UV) additive, 20-30 percent of hydrogenated alicyclic amine, 2.5-4 percent of modified amine type curing promoter and 12-27 percent of conductive filler. The transparent conductive film is low in both surface resistivity and size resistivity, can be made into thin films of different thickness, and has the advantages of high transparency, high conductivity, high adhesion strength and the like; and the preparation method has the advantages of simple preparation method, readily available raw materials and non-severe preparation conditions.

The invention discloses abnormal distribution aluminum hydroxide powder. The abnormal distribution aluminum hydroxide powder is made by mixing of aluminum hydroxide powder in particle size of 2micronand aluminum hydroxide powder in particle size of 18micron, and a mixing mass ratio of the aluminum hydroxide powder in particle size of 2micron and the aluminum hydroxide powder in particle size of 18micron is 11:8-11:4, preferably 11:7-11:5 and most preferably 2:1. Application of the abnormal distribution aluminum hydroxide powder refers to adding of the abnormal distribution aluminum hydroxidepowder serving as filler in preparation of a component A of two-component epoxy resin electronic pouring sealant. The abnormal distribution aluminum hydroxide powder has advantages that problems of anti-settling mutual exclusion and low viscosity in an epoxy resin system can be effectively improved, and the fusion performance of the abnormal distribution aluminum hydroxide powder is effectively improved; by application of the abnormal distribution aluminum hydroxide powder serving as filler to the epoxy resin electronic pouring sealant, low-viscosity non-settling products can be obtained, service time and fluidity of the products can be improved remarkably, and high practicality is realized.

The embodiment of the present invention provides a preparation method of flaky silver powder. In this method, the silver powder is first dispersed and then coated, and then the coated silver powder particles are ball-milled, which effectively prevents the silver powder particles from agglomerating during the ball-milling process. Agglomeration and agglomeration, the prepared flake silver powder has a small particle size and a high tap density.

The invention discloses a method for preparing a supported catalyst for preparing cyclopentanone with furfural through hydrogenation. An activated carbon nano tube is adopted as a carrier, and loading metal comprises Ni, Cu, Co and Mg. The method for preparing the catalyst adopts a double dropwise adding and coprecipitation method, thus preparing the catalyst with high capacity and improving the catalytic effect of the catalyst; the preparation condition for the catalyst is easy to realize; and the range of raw materials for preparation is wide, precursors of all components are general and the raw materials for preparation can be selected flexibly according to market price. The catalyst prepared by the method has higher catalytic activity, the furfural conversion efficiency is above 96.6%, and the cyclopentanone selectivity is above 95.4%, so that the catalyst can be used for preparing the cyclpentanone with the furfural as a raw material, the problem that cyclopentanone self polymerization is easy to occur so as to generate a material with high boiling point in the process of generation of cyclopentanone by taking adipic acid as a raw material is solved, and the product yield is improved.