45results about How to "Good stability at room temperature" patented technology

The present invention is directed to novel organometallic complexes as catalysts for the reaction of compounds with isocyanate and hydroxyl functional groups to form urethane and/or polyurethane and the process employing such catalysts. More particularly, the present invention is directed to novel complexes of zinc(II) with substituted amidines. These novel catalysts are useful for the production of urethanes and polyurethanes which are important in many industrial applications.

The invention discloses a detecting method for immunosuppressive agents in dried blood spots, and further discloses a detecting kit for the immunosuppressive agents in the dried blood spots. The detecting method comprises the steps that the standard curve dried blood spots and the to-be-detected dried blood spots are mixed with an extracting solution and an internal standard solution correspondingly and then extracted, centrifuging is conducted, and supernate is taken; the supernate is blown dry and then redissolved through a redissolving solution, and detecting is conducted through a tandem mass spectrum method; according to the peak exceeding area specific value of standard samples to an internal standard object and the concentration of the standard samples, linear regression is conducted to obtain a standard curve equation of the immunosuppressive agents; the peak exceeding area specific value of to-be-detected samples to the internal standard object is substituted into the standardcurve equation, and the content of the immunosuppressive agents in the to-be-detected samples is calculated; the extracting solution is a water solution of methyl alcohol and/or acetonitrile; and theimmunosuppressive agents are one or more of cyclosporine A, tacrolimus, sirolimus and everolimus. The detecting method can effectively detect the four types of immunosuppressive agents simultaneously, and thus the detecting efficiency is improved.

The invention relates to a room-temperature-storage type acrylate underfill adhesive and a preparation method thereof. The underfill adhesive comprises, by weight, 50-70 parts of modified acrylate resin, 20-30 parts of acrylate monomer, 1.0-5.0 parts of initiator, 0.1-1.0 part of inhibitor, 0.1-5.0 parts of auxiliaries and 0-5.0 parts of pigment. The room-temperature-storage type acrylate underfill adhesive is low in system halogen content, safer and more environment friendly, low in guarant viscosity, good in wettability and high in reliability, fully meets requirements on production process and reliability of SMT (surface mount technology), has excellent stability at room temperature and can be stored and transported at room temperature without cold preservation, and transportation and use costs are greatly reduced.

The invention discloses an underfill which is flowable at room temperature and is rapidly solidified at a low temperature. The underfill is prepared from the following raw materials, by weight, 20-50 parts of a liquid epoxy resin, 5-20 parts of an active epoxy diluent, 0-60 parts of spherical silicon powder, 5-20 parts of a polyester or polyester polyol, 0.1-5 parts of a catalyst, 0.2-2 parts of a coupling agent, 0.1-2 parts of a pigment, and proper amounts of a defoaming agent and a flow assistant. The invention also discloses a preparation method of the underfill. The underfill flowable at room temperature and rapidly solidified at a low temperature, which is prepared according to the method of the invention, has the advantages of reasonable composition ratio, fast flow speed, low solidification temperature, short solidification time, easy reparation, and effective improvement of the technological efficiency of a production lien of electronic products.

The invention discloses a method for improving the stability of copper ion ink and the conductivity of a copper film. The method comprises the following steps: dissolving a mixed ligand of anhydrous organic acid copper salt, alkylamine and hydramine in an anhydrous alcohol solvent, adding an alcohol-soluble binding agent to obtain a uniform and stable ink stock solution, adding a certain proportion of water prior to ink jet printing to prepare ink, printing the ink on a substrate in a ink jet printing manner, and performing heating and reduction in nitrogen to obtain the conductive copper film. The method adopts anhydrous organic acid copper salt and the anhydrous solvent and adjusts proportions of alkylamine and hydramine, so that the ink stock solution with good room temperature stability can be prepared, has no deterioration for at least three months, and is convenient to transport and store; an appropriate amount of water is added prior to the printing to prepare the ink to be printed into a pattern; the copper film with high conductivity can be obtained by the heating and the reduction in the nitrogen after drying; and the resistivity of the copper film obtained by the reduction at below 250 DEG C is only 3-10 times of that of bulk copper. The method is easy and simple to operate, and gives consideration to the room temperature stability of the ink and the high conductivity of the copper film.

The present invention provides a new chlorogenic acid composition. The chlorogenic acid composition has advantages of good stability at room temperature, high solubility, small reconstitution volume,more tolerable pH value of human body, etc., and is suitable for injection drug delivery system of subcutaneous/intramuscular administration. The preparation method can better meet safety during production, transportation and use processes and the more effective drug delivery system composition is provided for clinical application of chlorogenic acid.

The invention relates to a pouring sealant and a preparation method for the same. The pouring sealant consists of the following raw materials in percentage by weight: 30 to 60 percent of epoxy resin, 2 to 10 percent of a diluent, 0.5 to 5 percent of a silane coupling agent, 0.5 to 22 percent of a curing agent, 15 to 45 percent of compound silica micropowder and 0.5 percent of carbon black. The pouring sealant is high in flowing speed, antifoaming performance and adhesion and low in gap permeability, and is particularly applicable to the pouring of a complexly-structured component with a gap below which a circuit board is arranged, and the poured component is smooth in appearance and high in reliability.

A related low-temperature fast-curing impedance flame-retardant structural adhesive is composed of the following raw materials: 10 to 20 parts of self-synthesized flame-retardant epoxy resin gel, 25 to 35 parts of tricyclopentyl dimethoxy epoxy resin, 3 to 8 parts of a novel low-viscosity toughening agent, 20 to 30 parts of dipentaerythritol hexakis(3-mercaptopropionate), 4 to 6 parts of imidazoleadduct and 6 to 33 parts of ultrafine aluminum hydroxide. The structural adhesive prepared by the invention has the advantages of high low-temperature curing speed, easiness in single-component operation, good impedance performance, good flame retardance, low shrinkage, good bonding strength and the like, and is suitable for structural bonding of various micro motor inductance coils and associated difficult-to-bond materials.

The invention discloses a transfer factor powder spray and preparation process, which comprises the following constituents (by weight percent): transfer factor 0.5-50%, adhesive material 0-30%, filling agent 6.8-97.5%, phosphatides surface active agent 0-60%, amino acid 0-50% and absorption promoting agent 0-10%.

The present invention addresses the problem of providing: a liquid crystal composition having a liquid crystal phase in a wide temperature range, high [delta] n (refractive index anisotropy), and good normal temperature stability; and a liquid crystal display element, a sensor, a liquid crystal lens, an optical communication device, and an antenna using the same. A liquid crystal composition comprising one or more compounds represented by general formula (ii) having an isothiocyanate group (-NCS), the liquid crystal composition being obtained by using one or more compounds represented by general formula (i) having an indane structure or a tetrahydronaphthalene structure and an isothiocyanate group (-NCS) in combination with one or more compounds represented by general formula (i), the liquid crystal composition comprising one or more compounds represented by general formula (ii) having an isothiocyanate group (-NCS).

The invention provides a nasal spray containing human urinary kallidinogenase and a preparation method thereof. The nasal spray contains a pharmaceutical active ingredient human urinary kallidinogenase, a buffering agent, a pH regulator, an osmotic pressure regulator, a protease protective agent and an absorption promoter, wherein the buffering agent is selected from a disodium hydrogen phosphate-sodium dihydrogen phosphate buffering system; the pH value of the nasal spray is 6.0-7.0; the pH regulator of the nasal spray is selected from hydrochloric acid and sodium hydroxide; the osmotic pressure regulator is selected from sodium chloride; and the protease protective agent is selected from one or more of hydrolyzed gelatin or albumin; and the absorption promoter is selected from chitosan. The nasal spray is non-toxic and non-allergic to nasal mucosa, is easily absorbed by the nasal mucosa, has good stability, can remarkably improve the cerebral infarction condition, can be carried about, and is convenient for subsequent treatment of cerebral infarction patients.