5 results about "Polyol synthesis" patented technology

A method for preparing and applying a composite polyurea anti-corrosion and thermal insulation material. This belongs to the field of chemical technology. It comprises two components, A and R. Component A includes 65-75 parts of a prepolymer synthesized from polyisocyanate and 25-35 parts of polyether polyol; component R includes 5-30 parts of a chain extender, 40-60 parts of terminal amino polyether, and 1-3 parts of a nano-modifier. Components A and R are mixed at room temperature. The composite polyurea anti-corrosion and thermal insulation material is layered and alternately sprayed with rigid polyurethane foam, and then compounded with a resin composite material to prepare a new high-strength composite material with single or multiple layers. It is the best thermal insulation material for corrosion protection and insulation of oilfield pipelines, oil storage equipment, and marine vessels.

The utility model discloses a dispersing agent feeding device for polymer polyol synthesis, including setting in the dispersing agent storage bin of the synthesis reation kettle body upper end, the dispersing agent storage bin lower extreme is provided with the conical feeding hopper, the conical feeding hopper lower extreme is provided with the jet flow plugging component, the dispersing agent storage bin top is hinged with the upper end cover, the utility model relates to polymer polyol synthesis technical field, and the dispersing agent for polymer polyol synthesis is added to the dispersing agent storage bin, buckles the upper end cover, and utilizes the locking positioner and locks the upper end cover with the dispersing agent storage bin, and while injecting the basic polyether into the reaction kettle, starts the electric push rod on the upper end cover, utilizes the electric push rod and pushes the support rod and the pressure plate downlink, thereby through the conical extrusion head and presses the dispersing agent in the dispersing agent storage bin downwards, under the action of pressure, the dispersing agent promotes the jet flow plugging component action, thereby along the dispersing agent and sprays into the reaction kettle in the inclined direction, and the dispersing agent distribution is more uniform.

This invention belongs to the field of polyether polyol synthesis technology, specifically relating to bio-based high-strength polyether ester polyols and their preparation methods. The bio-based high-strength polyether ester polyol is obtained from the following raw materials: small molecule polyol, catalyst, bio-based epoxide, and bio-based phenyl ester compound; the bio-based epoxide is one or more of limonene epoxide, α-pinene oxide, and caryophyllene oxide; the bio-based phenyl ester compound is one or two of benzyl benzoate and benzyl cinnamate. The raw materials used in this invention can be obtained through natural plant extraction, achieving full bio-based polyether ester polyol production, thus fundamentally reducing dependence on fossil resources. By introducing a large number of cyclic and benzene ring structures into the polyol molecule, the resulting product is applied in the field of rigid polyurethane foam, increasing the content of rigid groups in the molecular chain structure, and significantly improving the strength of rigid polyurethane foam compared to traditional polyether polyols.

The application provides a preparation method and a process device of polyester polyol. Specifically, a two-stage membrane material assembly device is provided. The first stage is a PSF or PVDF coated base film assembly which is directly connected with a gas phase outlet of a polyester reaction kettle, can intercept small molecule alcohol ester in the gas phase reaction product, and refluxes to the reaction kettle. Water and other components generated by the reaction can pass through and enter the second stage separation membrane. The second stage is an adsorption de-aldehyde component modified pervaporation membrane assembly. The prepared adsorption membrane separation material solves the problems of complex esterification reaction dehydration and impurity removal process, low rectification separation efficiency, and the inability to recover byproducts and three wastes, innovates the traditional intermittent polyester production process with low reaction efficiency and long operation period, and has a wide application prospect in the polyester polyol synthesis field.

This invention provides a colorless, water-permeable carbon dioxide-based polycarbonate polyol and its preparation method, relating to the fields of polyol synthesis and carbon dioxide resource utilization. Addressing the various light scattering centers formed by residual metal catalysts, cyclic carbonate byproducts, terminal hydroxyl aggregates, and chain entanglement agglomerates in existing carbon dioxide-based polycarbonate polyols, this invention employs a combined decatalyst removal and purification process: "mild acid hydrolysis and complexation – precise neutralization and chain stabilization – graded gradient adsorption – temperature-controlled vacuum dehydration – precision filtration for impurity removal." This process thoroughly removes various light scattering centers from the system without damaging the polycarbonate polyol's main chain structure. The prepared product is colorless and water-permeable, with a transmittance ≥98% in the entire visible light spectrum (300-800 nm) and a total metal ion residue ≤10 ppm. This provides a high-quality core raw material for the preparation of highly transparent waterborne polyurethane, suitable for large-scale industrial production.