9 results about "Biurea" patented technology

The invention provides a preparation method of an ADC foaming agent for improving foaming pore density, which comprises the following steps: step 1, mixing a modified inorganic nucleating agent with water according to a predetermined mass ratio, adding a dispersing agent, and uniformly mixing to prepare uniform and stable suspension slurry to prevent agglomeration of the nucleating agent; 2, when the conversion rate of the biurea reaches 80%-85%, adding the suspension slurry, so that the inorganic nucleating agent is uniformly attached to the surface of the ADC crystal; and 3, continuing the oxidation reaction until the biurea conversion rate reaches 92% or above, and then washing, centrifuging and drying to obtain the ADC foaming agent. The ADC foaming agent for improving the foaming pore density is prepared by the method. The inorganic nucleating agent is added in the stage of preparing the ADC foaming agent, and compared with the inorganic nucleating agent added in the subsequent foam material preparation process, the density of foaming pores can be remarkably improved.

The present application relates to the field of functional nutritional fortifier micro-encapsulation technology, and discloses a kind of micro-encapsulated spray-dried 25-hydroxyvitamin D3 and its preparation method.The microcapsule is composed of 25-hydroxyvitamin D3, synergistically modified embedding matrix material, isophorone diisocyanate derived biuret small molecule and various additives, wherein the synergistically modified embedding matrix material is formed by casein and hydroxypropyl-beta-cyclodextrin under the action of covalent bridging, aromatic amine crosslinking network and boron-nitrogen synergistic coordination to form a dynamic covalent-supramolecular coupled multi-network structure.Through the synergistic effect of the multi-network structure and the interface self-assembly small molecule, the multiple confinement and interface stable regulation of 25-hydroxyvitamin D3 are realized.The preparation method includes the construction of synergistically modified embedding matrix material, emulsification and spray-drying steps.The microcapsule product obtained by the present application has the advantages of high embedding rate, strong thermal stability, excellent antioxidant performance and controllable release behavior, and is suitable for food fortification and feed additive fields.

The invention relates to the field of chemical production, in particular to a green production method of an ADC foaming agent. The green production method of the ADC foaming agent comprises the following steps: mixing biurea, an acidic medium aqueous solution and a catalyst to obtain slurry; placing the slurry in a reactor for reaction; after the reaction is finished, carrying out solid-liquid separation on a reaction product, collecting a solid phase, washing and drying to obtain an azodicarbonamide product; wherein in the step S2, the tail gas which does not participate in the reaction is guided out, and after the oxidizing gas is supplemented, the tail gas is introduced into the reactor again to participate in the reaction; the liquid-phase mother liquor obtained through separation in the step S3 is subjected to pH adjustment, and is completely or partially recycled to the step S1 to be used for preparing the slurry. The green production method of the ADC foaming agent provided by the invention is environment-friendly, green production is realized from the source, the production efficiency and economy are greatly improved, and the product quality is excellent.

The invention relates to the field of foaming polymer materials, and discloses a foaming master batch raw material composition, a foaming master batch using the raw material composition, a preparation method of the foaming master batch, an EPDM / PP TPV micro-foaming material composition, an EPDM / PP TPV micro-foaming material, and a preparation method and application of the EPDM / PP TPV micro-foaming material. The raw material composition for the foaming master batch comprises a base material, extending oil, a first foaming agent, a second foaming agent, an auxiliary foaming agent and a surfactant, the first foaming agent is one or more of azodicarbonamide, 4, 4 '-oxybisbenzenesulfonyl hydrazide, trihydrazino-s-triazine and biurea, and the second foaming agent is an inorganic foaming agent. The EPDM / PP TPV micro-foaming material prepared by using the foaming master batch disclosed by the invention is lower in foaming agent consumption and higher in tensile strength and elongation at break under the same foaming ratio.

The invention provides a method for directly preparing biurea from benzophenonetazine, which comprises the following steps of: adding an acid catalyst into a mixed solution of benzophenonetazine, urea and an organic solvent, heating for reaction, and finally centrifugally separating to directly obtain the biurea. The benzophenonetazine and the urea are used as raw materials, the raw materials are dissolved in the reaction solvent, the reaction product biurea is not dissolved in the reaction solvent, the product is easy to separate and purify, inorganic salt and ammonia nitrogen wastewater are not generated in the reaction, the technological process is simple, and the method has the advantages of being easy to implement industrially and remarkable in economic benefit.

The application provides a preparation method of azodicarbonamide, comprising the following steps: S1, uniformly mixing hydrogen peroxide solution with a stabilizer and a cocatalyst to obtain a first reaction solution; S2, mixing biurea, water and a catalyst to obtain a second reaction suspension; S3, dropwise adding the preheated first reaction solution into the second reaction suspension to perform an oxidation reaction, and obtaining azodicarbonamide after the reaction is completed; the stabilizer in the step S1 is one or more of 1,3-diamino-2-hydroxypropane-N,N,N',N'-tetraacetic acid, 8-hydroxyquinoline, sodium dihydrogen pyrophosphate and nitrilotrimethylene phosphoric acid. In the application, the selection of the hydrogen peroxide stabilizer and the cocatalyst can reduce the decomposition speed of hydrogen peroxide and improve the utilization rate of hydrogen peroxide, so that the loss of raw materials is reduced, the cost of raw materials is reduced, and the production profit is improved.

The application provides a preparation method of an ADC foaming agent for improving foaming cell density, which comprises the following steps: step 1: mixing a modified inorganic nucleating agent and water according to a predetermined mass ratio, adding a dispersing agent, uniformly mixing, and preparing a uniform and stable suspension slurry to prevent the nucleating agent from agglomerating; step 2: when the conversion rate of biurea reaches 80%-85%, the suspension slurry is added, and the inorganic nucleating agent is uniformly attached to the surface of the ADC crystal; step 3: continuing the oxidation reaction until the conversion rate of biurea reaches more than 92%, and then performing washing, centrifugation and drying to obtain the ADC foaming agent. The ADC foaming agent for improving foaming cell density is prepared by the above method. In the preparation process of the ADC foaming agent, the inorganic nucleating agent is added, compared with adding the inorganic nucleating agent in the subsequent preparation process of the foaming material, and the foaming cell density can be significantly improved.

The application provides a preparation method of azodicarbonamide, which comprises the following steps: step (1), mixing biurea, a ferrous compound catalyst and water according to a certain proportion to prepare a biurea suspension; step (2), adjusting the pH value of the biurea suspension prepared in step (1) to 2-6, and heating the biurea suspension with the pH value of 2-6 to 50-100 DEG C to obtain a second suspension; step (3), slowly dropping hydrogen peroxide solution into the second suspension obtained in step (2) to react for a certain time to obtain solid azodicarbonamide; and step (4), separating and washing the solid azodicarbonamide prepared in step (3), so that azodicarbonamide is obtained. In the application, hydrogen peroxide is used as an oxidant, a ferrous compound is used as a catalyst, and the ferrous compound and hydrogen peroxide are reacted, so that biurea can be efficiently oxidized to obtain azodicarbonamide, there is no risk of harmful gas leakage, no waste salt is generated, the preparation process is clean and green.