6 results about "Substituted urea" patented technology

The utility model provides a high-speed negative pressure spraying device for a denitration skid-mounted station, which relates to the technical field of spraying devices and comprises a volute fan, and the output end of the volute fan is connected with a spraying assembly. The spraying assembly comprises a conical air spraying pipe connected with the output end of the volute fan, and the conical air spraying pipe is sleeved with a spraying pipe; the injection pipe sequentially comprises a negative pressure cavity, a folding cavity, a smooth cavity, a release cavity and a flow guide cavity from left to right. According to the utility model, negative pressure can be formed when high-speed air flow passes through the negative pressure cavity, urea powder is sucked into the negative pressure cavity to be mixed with air, and the urea powder is efficiently conveyed to a reaction area through the high-speed air flow to be fully contacted and reacted with NOx, so that the urea is decomposed into ammonia gas, and the denitration efficiency is improved; a urea solution is replaced, and the problems that a traditional liquid reducing agent injection system is uneven in injection, high in equipment complexity and poor in environmental adaptability and has leakage hidden dangers are solved.

The invention relates to the field of high polymer materials, the field of light-cured resin and the field of light-cured coatings, in particular to polyurethane-urea acrylate with a ureido-containing side chain and a preparation method of the polyurethane-urea acrylate. According to the invention, isocyanate acrylate is selected to react with amino compounds with different structures. And further reacting the generated product with diethanol amine to synthesize dihydric alcohol (T-type chain extender) of which the side group contains carbamido. Then, the synthesized T-type chain extender, diisocyanate, dihydric alcohol and a photosensitive end-capping reagent can be further prepared into the high-performance light-cured resin with the side chain containing ureido. The prepared light-cured resin shows higher tensile strength and modulus under the synergistic effect of double hydrogen-bond interaction of non-substituted ureido and strong movement ability of a side chain, and the hardness of a coating is remarkably improved. In addition, the preparation process is mild in reaction condition, and good controllability and reproducibility are achieved.

This invention discloses a method for preparing substituted urea derivatives. The preparation method provided by this invention uses inexpensive and readily available raw materials, operates under mild conditions, has a short reaction time, is safe and controllable, and has a high overall yield, making it particularly suitable for industrial production.

The invention relates to a thermosetting epoxy resin composition comprising an epoxy resin, a dihydrazide curing agent, a boron trihalide-amine complex, a substituted urea and at least one toughness improver. The composition, when cured at low curing temperatures, is characterized by good lap shear values combined with good impact peel and T-peel performance. The epoxy resin composition is especially suitable for use as a body adhesive.

The invention relates to an agricultural composition which comprises (i) a water-soluble source of silicon and (ii) a silicon transport stimulant comprising an aryl substituted urea. The water-soluble

Invention relates to the field of producing melt epoxy binders for structural polymeric composite materials based on fibrous fillers obtained by prepreg technology. Epoxy binder includes the following components in the following ratio in wt.%: difunctional epoxy resin 8.6-14.8, mixture of polyfunctional nitrogen-containing epoxy resins 34.8-47.4, rubber-containing component 15.7-20.9, thermoplastic resin - polyethersulfone 8.0-13.1, curing agent, aromatic diamine 10.5-16.5, blocked curing agent - dicyandiamide 3.0-4.3, latent curing accelerator - asymmetrically substituted urea 0.4-2.0. Prepreg comprises said epoxy binder and fibrous filler in the following ratio, wt. %: epoxy binder 24-55, fibrous carbon filler 45.0-76.0. EFFECT: developed epoxy binder and prepreg, made therefrom, demonstrates improved technological characteristics and makes it possible to obtain products with a higher level of preservation of physical and mechanical properties.