42results about How to "Adapt to industrialized mass production" patented technology

The invention relates to a method for making handmade paper by a dry method, wherein, bamboo is adopted as raw material, dry paper pulp is obtained after the bamboo is crashed, a dry paper pulp sheet can be obtained from the dry paper pulp by extrusion, the dry paper pulp sheet is further dispersed into fiber, and the dry paper pulp fiber enters an air channel in the suspension form under the action of an airflow generated by an induced draft fan and is intercepted by a polyester net to form a uniform dry paper pulp layer which is covered with a fixed layer; under the holding of the upper fixed layer and the lower polyester net, wet paper is formed by the dry paper pulp layer treated with water absorption by a water supplying tank, the wet paper is separated from the fixed layer and the polyester net after being extruded, and the handmade paper can be obtained form the separated wet paper by drying. The method for making the handmade paper has only one harmful chemical, i.e., alkali liquor which is added in the production process, and gas and liquid are not discharged in the production process to pollute the environment; in the pulping process, the pulp outcome rate of the raw material reaches more than 95 percent, the sizing agent does not need washing and can not be lost, thus utilizing the bamboo resources maximally and saving the raw material.

The invention discloses a preparation method of pomalidomide. The preparation method of pomalidomide comprises the following step; in N,N-dimethylacetamide or a mixed solvent of N,N-dimethylacetamide and other solvents, carrying out reduction reaction shown in the formula (described in the specification) on hydrogen and a compound shown in a formula II in the presence of palladium on activated carbon, wherein other solvents can be alcohol solvents, ketone solvents or water. The preparation method of pomalidomide has the advantages of high yield, low solvent consumption and high purity and is also applicable to industrial large-scale production. The formula II is described in the specification.

The invention discloses an air-conditioning air duct pipe for a rail vehicle. The air duct pipe is a composite pipe, and from the inside to the outside is an inner side layer, a fiber-reinforced airgel felt layer and an outer side layer; the inner side layer and the outer side layer are solidified prepreg or sheet metal. The rail vehicle air-conditioning duct pipe of the present invention can be directly spliced ​​and installed; the fiber-reinforced airgel layer in the middle is light in weight, has an outstanding heat preservation effect, and is a non-combustible material, so that the rail vehicle air-conditioning duct pipe has excellent flame retardancy performance and thermal insulation effect; since the fiber-reinforced airgel material is encapsulated between the cured prepreg layers, after the air duct pipe is installed on the train, no matter how the train drives the air duct to vibrate, there will be no fiber reinforcement The airgel material has no powder falling problem, so the heat preservation effect is stable and long-lasting.