302results about How to "Good solubility" patented technology

Starlike anti-shearing polyacrylamide for fracturing fluid and preparation method of starlike anti-shearing polyacrylamide

ActiveCN104497220AGood solubilityRegular and compact structureDrilling compositionPolyamideThioxanthone
The invention discloses starlike anti-shearing polyacrylamide for a fracturing fluid and a preparation method of the starlike anti-shearing polyacrylamide. The core of the polymer is a thioxanthone modified dendriform polyamide-amine water soluble initiator and the arm of the polymer is a propenamide homopolymer and an acrylamide bipolymer or terpolymer. The preparation method comprises the following steps: modifying a dendriform macromolecule polyamide-amine in chloroform by using 2-epoxy thioxanthone so as to obtain a dendriform multifunctional macromolecular initiator; and initiating monomer polymerization of acrylamide and the like by taking the dendriform multifunctional macromolecular initiator as an initial starting core in an aqueous solution so as to prepare anti-shearing polyacrylamide. The starlike polymer which serves as a thickener is used for the fracturing fluid, is excellent in temperature-resisting and anti-shearing performances and free of residues after gel breaking and provides a powerful guarantee for wide application of fracturing construction operation in oil and gas fields. The preparation method is reliable in principle, strong in operability, mild in condition and relatively high in yield and has a broad market prospect.

Selfheal polysaccharide zinc chelate as well as preparation method and application thereof to anti-cancer drug

The invention discloses a selfheal polysaccharide zinc chelate as well as a preparation method and application thereof to an anti-cancer drug. The method comprises the following steps: crushing selfheal clusters, decolorizing by use of ethanol, adding distilled water, performing reflux extraction, deproteinizing the extracting solution, performing ultrafiltration, and freeze-drying the retained liquid to obtain polysaccharide; preparing a polysaccharide solution of which the concentration is 10 mg/mL to 40 mg/mL, heating to the temperature of 40-60 DEG C, regulating pH by using sodium hydroxide, slowly adding a zinc salt solution into the polysaccharide solution, reacting for 6-24 hours, simultaneously performing an discontinuous homogenization process by using a high-shear homogenizer, regulating the pH by using hydrochloric acid, centrifuging to obtain supernatant liquor, putting the supernatant liquor into a dialysis bag for dialysis, collecting the solution in the dialysis bag, and performing freeze-drying to obtain the selfheal polysaccharide zinc chelate. The product disclosed by the invention is simple and easy to implement in preparation method, has a remarkable anti-proliferation effect on human cancer cells and also causes no cytotoxicity to normal cells of the human body, so the selfheal polysaccharide zinc chelate is an ideal anti-cancer drug or a health care product and also has a zinc replenishment effect.

Yellow-light electroluminescent material based on 8-hydroxyquinoline zinc metal complex tripolymer and controllable preparation method thereof

The invention discloses a yellow-light electroluminescent material based on an 8-hydroxyquinoline zinc metal complex tripolymer and a controllable preparation method thereof. According to the controllable preparation method, an electron-withdrawing group and an electron-donating group are simultaneously introduced to a 8-hydroxyquinoline ligand, the electron-withdrawing group has the effects of reducing the electron cloud density of a pyridine ring and enhancing the charge transmission property of the pyridine ring, and the electron-donating group has the function of enhancing the solubility of a complex. The controllable preparation method disclosed by the invention realizes the controllable preparation of a single-crystal structure of the 8-hydroxyquinoline zinc metal complex tripolymer, and the maximum absorption peak of the single-crystal structure is in a yellow-light emitting area of 588 nanometers. The yellow-light electroluminescent material disclosed by the invention has the advantages of good solubility property, good film-forming property, high yield, high luminous efficiency, good stability and low cost and can be used for conveniently processing and manufacturing a large-area display device.

Photochromic compound and preparation method and application thereof

The invention discloses a photochromic compound. The structure of the photochromic compound is represented by a formula A (shown in the description), wherein R represents a fluorescence group and represents substituted or unsubstituted naphthalene, anthracene, xanthenes, pyrene 1,8-naphthalimide, coumarin or pyran nitrile, and a substituent group on R is C1-C4 alkyl, halogen, hydroxide radical, C1-C4 alkoxy or C1-C4 alkyl amino; X represents oxygen, and Y represents C(CH3)2; or X represents N(CH3), and Y represents C(O). The invention further discloses an isomer of the photochromic compound, a mixture of the photochromic compound and the isomer and a preparation method and an application of the photochromic compound. The maximum absorption wavelength of a color-changing group of the photochromic compound is in a visible light region, but the maximum absorption wavelength of the fluorescence group is in an ultraviolet region and a near visible light region, so that the overlapping of the maximum absorption wavelengths of the two groups is effectively avoided. The photochromic compound has remarkable and special absorption and emitting properties in the ultraviolet region and the visible light region and can be used for producing photochromic fluorescence switches and molecular logic gates.

Method for producing curing agent having acidic substituent and unsaturated maleimide group, thermosetting resin composition, prepreg, and laminate

Disclosed is a method for producing a curing agent having an acidic substituent and an unsaturated maleimide group, wherein a maleimide compound (a) having at least two N-substituted maleimide groups in a molecule and an amine compound (b) having an acidic substituent represented by the general formula (I) below are reacted in an organic solvent. Also disclosed is a thermosetting resin composition containing a curing agent (A) obtained by the above-described method, and a compound (B) which is cured with the curing agent. A cured product of such a thermosetting resin composition has a glass transition temperature of not less than 200 DEG C. Further disclosed are a prepreg using such a thermosetting resin composition, and a laminate. The curing agent produced by this method enables to obtain a thermosetting resin composition having good solubility in an organic solvent, while being excellent in adhesion to metal foils, heat resistance, moisture resistance, flame retardance, copper cladding heat resistance, low dielectric characteristics and low dielectric loss tangent property. Consequently, the curing agent enables to obtain a prepreg or a laminate having excellent properties useful for printed wiring boards for electronic devices.
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