41results about How to "Easy to wash and remove" patented technology

The invention relates to a condensation and washing method of perfluoroethylene propylene resin. The condensation and washing method comprises the following steps: 1) adding room-temperature de-ionized water into perfluoroethylene propylene emulsion and adjusting the emulsion ratio to be 1.03 to 1.20; starting to stir and carrying out physical emulsion breaking on the emulsion for 15 to 60 min under the condition of 500 to 2000 r / min; 2) adding a condensation agent ammonium bicarbonate with the resin solid content of 1 to 5 percent into the emulsion and continually stirring until the perfluoroethylene propylene emulsion is completely broken; 3) repeatedly washing perfluoroethylene propylene, which is separated through the emulsion breaking, by utilizing the room-temperature de-ionized water until the detection is qualified. The method provided by the invention is used for carrying out the emulsion breaking and can be used for completely separating out the resin in the perfluoroethylenepropylene emulsion; compared with other methods, the subsequent dosage of washing water is not increased. The method provided by the invention is simple in steps and environmentally friendly, and industrialized large-scale production is facilitated.

The invention provides a crystallizing method of a solid antioxidant. Abundant ultrafine crystal grains crystallized in the primary crystallization process are quickly dissolved by a twice quick slight heating method, and large crystal grains are reserved to continue growth in the secondary crystallization process, so that the product crystals can grow bigger and more uniform. The anticaking capacity of the product is greatly enhanced; and meanwhile, since the crystals are more uniform and do not contain abundant fine powder, the subsequent spin-drying can be ensured, and other impurities can be washed out more easily in the washing process, thereby obtaining the product with higher purity.

The invention discloses a preparation method for carfilzomib. The method utilizes HATU as a condensing agent to perform condensation and comprises a plurality of steps. The method has the characteristics of short reaction time, simple feeding, no need for nitrogen protection, appropriate control the feeding temperature, no need for strict temperature control, and easier washing and removal of the by-product of HATU, greatly shortens the preparation time, and improves the work efficiency, thus being suitable for industrial production.

The invention provides a method for preparing nano YAG (yttrium aluminum garnet) fluorescent powder. Carbonate precursor particles of YAG are dispersed and isolated with nano potassium sulfate in xylene, after centrifugal precipitation, precipitates are dried and then calcined at the high temperature, a calcined product is secondarily calcined in the reduction atmosphere, and high-dispersity nanoYAG fluorescent powder with good light emitting performance can be obtained after water washing. By means of the method, the nano YAG fluorescent powder with good dispersity and perfect crystals can be rapidly prepared in batches. The fluorescent powder can be made into transparent fluorescent gelatin, light scattering loss is eliminated, and the problem of inconsistency of light color of a white-light LED due to settlement can be solved.

The invention provides a method for preparing porous cerium-based oxide from a water-soluble cerium precursor. To be specific, the water-soluble cerium precursor is obtained through reaction of cerium salt and concentrated sulfuric acid in absolute ethyl alcohol; porous cerium dioxide is obtained in the following way: the cerium precursor and an ethanol solution of NaOH have solid-liquid interface reaction, and then washing is carried out to remove the cerium precursor not completely reacted; the cerium-based composite oxide is obtained through reaction of porous cerium dioxide and an ethanol solution of metal salt under the heating condition. During the preparation process of the cerium precursor, the cerium precursor with different shapes can be obtained through changing the experiment parameters including concentration of sulfuric acid, reaction temperature, reaction time and the like to further adjust and control the shape of the porous cerium-based oxide. According to the invention, the method is simple and practical, the controllability is high, the pollution is small, the cost is low, and certain universality is realized. The prepared product has a mesoporous structure; the synergistic effect among all components in the composite oxide enables the components to express superior catalytic activity during CO catalytic reaction.

The invention discloses a metal oxide nanoparticle and a preparation method of the metal nanoparticle. The metal acetylacetonate is dissolved in an organic solvent as an impregnating liquid, impregnated with a water-soluble inorganic salt, dried, calcined or reduced at high temperature, and washed with water to obtain dispersed Metal oxide nanoparticles or metal nanoparticles. The calcined product is calcined for the second time in a reducing atmosphere, and the dispersed nano metal powder can be obtained after washing with water. The invention can rapidly prepare metal oxide nanoparticles or metal nanoparticles with good dispersion and perfect crystallization in batches.

The invention relates to a method for preparing a sizing agent for sizing of poplin type tightly-woven fabric fiber. According to the method, polyoxyethylene, polyoxypropylene ether, polyacrylamide, di-rhamnolipid and sizing paste are added to a flask containing a stirrer, a thermometer and a reflux condensing tube, deionized water and taurine are added, temperature is increased to 85 DEG C, nitrogen is introduced for protection, stirring is conducted for 40-50 min, citric acid is slowly added for about 2 h, heat preservation is conducted for 2 h, then a PMA sizing agent, laurinol polyoxyethylene ether and ethanol are added for reaction for 9-12 h, temperature is lowered to indoor temperature, and then the sizing agent for sizing of the poplin type tightly-woven fabric is obtained. The sizing agent prepared with the method has high fiber adhesive force and high cohesive force after sizing is conducted, and fiber fuzzing can be prevented through a surface film formed on the surface of the fiber; furthermore, decoating or reduction of fiber strength caused by friction is avoided, fiber strength can be improved, and meanwhile, the elasticity, flexibility and extensibility of the fiber are maintained.