544results about How to "Good water dispersibility" patented technology

The invention relates to an auxiliary material for casting a mould, in particular to a casting mould water-based coating formulation for a sand mould or an expendable pattern casting (EPC), and a process for preparing the same. The casting mould water-based coating formulation consists of refractory powder, a suspending agent, a bonding agent, a surfactant, a defoaming agent, a corrosion remover and water. The process comprises the following steps: adding the suspending agent to the water directly, and mixing and dispersing the mixture in a high speed dispersion machine; adding auxiliary agents including the defoaming agent, the surfactant, the corrosion remover, and the like to the water, and mixing the auxiliary agents; adding the refractory powder to the mixture to be mixed; and adding the bonding agent to the mixture to be mixed, and then adding water to adjust the coating until the coating has the thickness in a using state to obtain the finished product. The coating prepared by the process has the effects that the coating ensures that a high-density low-viscosity coating has excellent suspension property and storage stability, a coating layer is not easy to crack after drying, the coating is advantageous to improve the capacity of the coating to resist high temperature metal corrosion, and the like.

The invention relates to a method for preparing a nanocomposite by using two-dimensional transition metal chalcogenide nanosheets and metal, and belongs to the field of nanomaterial synthesis. The method mainly includes adding a reducing agent and a stabilizing agent into monolayer or multi-layer two-dimensional transition metal chalcogenide nanosheet aqueous dispersion obtained after chemical intercalation, then injecting a certain amount of metal salt solution, and preparing the metal nanocomposite based on monolayer or few-layer two-dimensional transition metal chalcogenide nanosheets on the conditions of ice bath, hydrothermal method, microwaves, ultrasound and the like. In the composite, metal nanoparticles can be evenly distributed on the surfaces of the nanosheets, and the obtained composite can be evenly dispersed in water, and can be used in the solution phase and further processed. Through compositing of the metal nanoparticles, photoelectric property of two-dimensional transition metal chalcogenide can be improved, and the nanocomposite has good application prospects in the fields of supercapacitors, fuel cells and biosensors based on surface enhanced Raman detection, and the like.

The invention relates to a hyper branched polyamide amine and metal nanometer compound and the preparation method and the application, belonging to the technical field of nanotechnology which is characterized in that: the compound comprises a polymer and metal nanometer particles, the polymer is the hyper branched polyamide amine made of blocking modification the hyper branched polyamide amine of the vinyl-terminated through different small organic molecules with amine, the content of the polymer is 89wt percent to 98wt percent; the metal nanometer particles are golden or silver nanometer particles, the content of the metal nanometer particles is 2wt percent to 11wt percent. During the preparation course, no reducing agent or ultraviolet irradiation is required, the precursor metal compounds are directly added into the hyper branched polyamide amine solution, and the metal nanometer particles with perfect water dispersion is generated only through one-step reaction under ambient temperature, the average particle size of which is one to eight nm, and the size is controllable. The inhibition zone method and the optical density method tested show that: the hyper branched polyamide amine and the metal nanometer particle compound have perfect antibacterial effects to a plurality of bacteria and fungus.

Belonging to the paint field, the invention relates to a preparation method for a low acid value and low VOC waterborne acrylic acid and fatty acid modified epoxy resin. The method includes: firstly modifying epoxy resin with fatty acid, then conducting modification with acrylic acid and acrylate monomer under the action of an initiator, then adding a neutralizer and a drier, adding water to perform emulsification, and reducing pressure to remove the solvent, thus obtaining a low acid value and low VOC waterborne acrylic acid and fatty acid modified epoxy resin emulsion, which has an acid value of 10-15mgKOH/g, a solid content of 30-50%, and a VOC content of less than 7%. Due to a low acid value, the obtained resin has excellent water resistance, and because of the extremely low VOC content, the emission of pollutants is greatly reduced, and the harm to the human is lowered. In addition, due to high unsaturated fatty acid content and epoxy resin content and adding of the drier, the resin itself can have the characteristics of natural drying at room temperature, excellent anti-rust performance and the like.

A polyester aqueous dispersion having excellent properties in waterproof, weatherproof, processibility and adhesion, which provides a large allowance for controlling liquid physical properties by post treatment and is advantageous in making dry powders from the dispersion, and an efficient method for preparing the aqueous dispersion at low costs in a simple manner. The polyester aqueous dispersion comprising (i) a water-insoluble polyester and (ii) a polyester containing a sulfonate group bound to a polymer in a concentration of 0.1 to 1.5 mmol equivalents when calculated as -SO3- group per gram of the polymer, and method for preparing a polyester aqueous dispersion comprises a step of melt-kneading a resin composition comprising the water-insoluble polyester (i) and polyester (ii) and a step of phase inversion of adding water or a basic aqueous solution to the molten kneaded mixture thereby to shift the resin composition into the aqueous dispersion.

The invention discloses attapulgite washable inner wall paint. The technical proposal comprises the following key points that: the attapulgite washable inner wall paint consists of creamy attapulgite clay, nano-alumina, polyvinyl alcohol superfine powder, instant sodium silicate, anatase type titanium pigments, tributyl phosphate, optical bleaching agent VBL and deionized water. A production method of the attapulgite washable inner wall paint comprises: compounding, crushing, stirring, dispersing, dissolving, homogenizing, emulsifying, defoaming, grinding, and canning into the finished product of the attapulgite washable inner wall paint. The attapulgite washable inner wall paint has the characteristics of no toxicity, odorlessness, hard paint film, fine and soft hand feel, water resistance, alkali resistance and good adhesion. The washable time can be more than 1,000 times, and stains cannot be left after washing for many times. The attapulgite washable inner wall paint is applicable to decorating inner walls of various civil and public buildings and the like.

The invention discloses a water-dispersible HDI-TDI mixed tripolymer curing agent and a preparation method thereof. The method comprises steps as follows: (1) diisocyanate monomers and a nonionic hydrophilic modifying agent are put into a round-bottom flask under the protection of nitrogen and heated to reach 50-70 DEG C for a thermal reaction; (2) after the mixture reacts for 2-4 h, a trimerization catalyst is added, the mixture is subjected to a thermal reaction continuously, a polymerization inhibitor is added after the percentage composition of -NCO of the system reaches the target, and the mixture is subjected to the thermal reaction for 0.5-1.5 h; (3) an anion hydrophilic modifying agent is added to a tripolymer obtained in the step (2), the mixture is continuously stirred and subjected to the thermal reaction at the temperature of 60-80 DEG C, a neutralizing agent is added after the mixture reacts for 5-7 h, and the mixture is stirred uniformly, subjected to the thermal reaction for 0.5-1.5 h and discharged after being cooled. The preparation method is simple, and the prepared curing agent has the advantages of good water dispersibility, good storage stability and good film water resistance and can be applied to a water-based bi-component polyurethane coating well.

The invention belongs to the field of paints, and relates to a low-acid-value and low-VOC aqueous acrylic acid and fatty acid modified epoxy resin, which comprises the following synthetic raw materials: 15-40 parts of epoxy resin, 11-40 parts of unsaturated fatty acid, 2-8 parts of an acrylic monomer, 5.5-35 parts of an acrylate monomer (containing styrene), 0-0.1 part of a catalyst, 0.6-2 parts of an initiator, 20-40 parts of a solvent, 5-15 parts of a neutralizer, 1-5 parts of a drier, and 100-200 parts of water. The synthetic raw materials are synthesized according to a process to obtain the low-acid-value and low-VOC aqueous acrylic acid and fatty acid modified epoxy resin emulsion, wherein the emulsion has an acid value of 10-15mgKOH/g, a solid content of 30-50%, and a VOC content of less than 7%. The resulting resin has excellent water resistance because of the low acid value, and the emission of pollutants is greatly reduced, and the harm to people is reduced because of the very low VOC content. In addition, the contents of unsaturated fatty acids and epoxy resin are high, and the drier is added, so that the resin has the characteristics of room-temperature air drying, excellent anti-corrosion performance and the like.

The invention discloses a photosensitive microcapsule used for photodynamic therapy and a preparation method thereof, belonging to the technical field of photosensitive polymer thin film materials. The photosensitive microcapsule is prepared by the following steps: firstly, preparing photosensitive polymer materials of photosensitizer molecule graft polymer, and then adopting the layer self assembly technology, assembling polyelectrolyte materials with opposite charges on a microballoon template, and preparing a hollow capsule assembled by a plurality of capsule walls, wherein materials of the capsule walls include natural polymer glycan (CHI) or glucan directly grafted with photosensitizer by chemical bonds. The photosensitive microcapsule has good biocompatibility, fixes photosensitive molecules, can kill cancer cells effectively, can be applied to (Photodynamic Therapy) PDT, and is good in water dispersion and uniform in particle size, high in single-state oxygen content yield under the illumination of beams with specific wavelength, simple in process and easy in operation.

The invention discloses a stable method for microencapsulating carotenoid. The method comprises 1) a step of completely dissolving a protecting colloid, sucrose or glucose, ascorbyl palmitate and EDTA into water, and adjusting pH to 10-11 to obtain a water phase A; 2) a step of completely dissolving carotenoid and an antioxidant into a solvent to obtain an oil phase B; 3) a step of adding the oil phase B into the water phase A under a condition of high-speed shearing and high-speed stirring; emulsifying the mixture to form an initial emulsion by stirring at a high speed; and heating and removing the solvent to obtain a microemulsion; and 4) a step of adding the obtained microemulsion into a spray drying system; and obtaining carotenoid particles or powder after spray drying. The carotenoid particles or powder prepared by the method have advantages of good dispersibility, high stability, good light permeability and small particle sizes.

The invention relates to a polyether amine modified waterborne epoxy floor hardener and a preparation method thereof. The polyether amine modified waterborne epoxy floor hardener is prepared through modification of polyether amine, synthesis of epoxy-amine and dispersion of deionized water; the molar ration of the polyether amine, epoxy-terminated glycidyl ether and epoxy resin is 2-6:0.5-4.5:0.5-4.5; during reaction, the polyether amine is firstly added into a reactor, then the epoxy-terminated glycidyl ether is added, the epoxy resin is added in drops, and lastly, the reactants are dispersed through the deionized water to obtain the polyether amine modified waterborne epoxy floor hardener. The preparation method of the polyether amine modified waterborne epoxy floor hardener is simple in process; the reaction temperature is easy to control; waterborne epoxy floor paints produced with the polyether amine modified waterborne epoxy floor hardener are high in hardness and glossiness, reach level-1 impact resistance and obtain high acid and alkali resistance.

The invention discloses a method for preparing a high water dispersibility titanium dioxide. The method comprises the following steps sequentially: a, adding a dispersing agent into a titanium dioxide slurry, and stirring uniformly; b, adding a phosphorus-containing solution, and curing; c, adding an aluminum sulfate solution to control the pH value of the titanium dioxide slurry to be 1.5 to 4.5, and curing; d, adding a sodium metaaluminate solution to control the pH value of the titanium dioxide slurry to be 8.5 to 10.5, and curing; e, adjusting the pH value of the titanium dioxide slurry to be 7.0 to 7.8, and curing; f, filtering, washing, drying, and pulverizing to obtain the high water dispersibility titanium dioxide. According to the method, before coating, the dispersing agent is added to improve a dispersing condition of the titanium dioxide slurry, then the phosphorus-containing solution and the aluminum-containing solution are used as a coating agent, and then the coating agent is deposited on the surface of titanium dioxide in forms of aluminum phosphate and hydrated alumina, so that the water dispersibility of a product is effectively improved, and the titanium dioxide product with the high water dispersibility is obtained.

The invention discloses a self-emulsifying waterborne polyurethane curing agent and a preparation method thereof. The self-emulsifying waterborne polyurethane curing agent takes micromolecule dihydric alcohol containing a sulfonic acid group with a molecular weight of 350 to 1,000 and diisocyanates as raw materials to prepare the sulfonic acid group modifying self-emulsifying waterborne polyurethane curing agent with a multifunctional NCO group on a terminal. The invention also discloses a preparation method of the self-emulsifying waterborne polyurethane curing agent. The self-emulsifying waterborne polyurethane curing agent has the advantages of good water dispersibility, good storage stability, good water resistance of coating film, high strength property and the like, and is suitable for mating with waterborne polyurethane dispersion, waterborne acrylic emulsion and waterborne alkyd resin and the like, prepared two-component polyurethane coatings and adhesives by the self-emulsifying waterborne polyurethane curing agent are especially suitable for some special performance requirements of waterborne products. The self-emulsifying waterborne polyurethane curing agent disclosed by the invention can also be used for mating with hydroxyl components of the solvent-type two-component coatings and the adhesives to produce a two-component solvent type and has a wide range of application.

The invention relates to graphene/titanium dioxide composite adopting a unique hollow microspherical structure and a simple preparation method convenient to implement and belongs to the technical field of synthesis and preparation of graphene-based micro-nano composite. Firstly, an improved Stober method is adopted for preparing silicon dioxide microspheres, then each silicon dioxide microsphere is coated with an oxidized graphene layer with an ultrasonic assisted self-assembly method, titanium tetrafluoride is taken as a precursor, titanium dioxide is precipitated and crystallized on surfaces of silicon dioxide/oxidized graphene composite microspheres with a solvothermal method, silicon dioxide inner cores are dissolved and removed, the oxidized graphene component coating the spheres is further reduced, and accordingly, the graphene/titanium dioxide composite hollow microspheres are prepared. The composite hollow microspheres show good water dispersibility, has efficient catalytic activity for light degradation of organic dye and have wide application prospects.

The invention provides a camptothecin prodrug. The camptothecin prodrug is a prodrug formed bycamptothecin or a derivative thereof and Evans blue, the structural formula of the prodrug is represented by formula (I); and in the formula, R<1> is camptothecin or a derivative group thereof, R<2> is one of -CH2- and -O-, R<3> is one of -CH2-, -O-CO- and -O-CO-NH-, X is one of S and -CH2-, and n1 and n2 are the repeating unit number, and are integers in a range of 0-10. The camptothecin prodrug has an excellent tumor cell uptake effect in vivo and in vitro, and a part of the prodrug has a substantial cancer cell inhibition effect. The invention also provides a preparation method of the camptothecin prodrug and an application of the camptothecin prodrug in the preparation of cancer treatment drugs.

The invention relates to a method for extracting chilli oil resin from chilli. The method comprises the following steps: 1, extracting and separating the chilli oil resin by utilizing supercritical CO2; 2, purifying the extracted chilli oil resin by means of short-path molecular distillation; and 3, increasing the water solubility of the purified chilli oil resin by utilizing an emulsification solubilizing technology, and finally wrapping the chilli oil resin by utilizing a microcapsule technology to obtain an antiseptic seasoning. The method provided by the invention has the advantages that 1, the extraction efficiency of the chilli oil resin is improved by adopting the CO2 supercritical extraction technology; 2, the purity of the chilli oil resin reaches over 95% by using the short-path molecular distillation technology; 3, the water dispersion of the chilli oil resin is improved by adopting the emulsification solubilizing technology; 4, the chilli oil resin is powdered by utilizing the microcapsule technology, so that the product performance is more stable; and 5, the extracted chilli oil resin does not contain organic solvent and heavy metal residue.

Provided is a highly water dispersible powder which exhibits a high water dispersibility in spite of the inclusion of a poorly water soluble component, and maintains the high water dispersibility stably over time.

The highly water dispersible powder includes a poorly water soluble component, a water soluble polymer having a protective colloid effect, and a saponin. The highly water dispersible powder can be produced by a method including: emulsifying a poorly water soluble component in an aqueous solvent under the presence of a water soluble polymer having a protective colloid effect and a saponin, thereby preparing an emulsion; and drying the obtained emulsion.

This invention discloses a method for preparing water-soluble lycopene nanoscale dispersion product. The method comprises: dissolving lycopene or its oleoresin in an organic solvent, mixing the organic phase with an aqueous phase dissolved with an appropriate emusilfier, breaking lycopene into nanoscale by ultrahigh pressure homogenization or ultrasonic breakage, and vacuum-distilling the organic solvent to obtain uniform and stable water-soluble lycopene nanoscale dispersion (50-500 nm). The water-soluble lycopene nanoscale dispersion product can be added into water-based foods at any ratio, which solves the problem of lycopene dissolution in water-based foods. Besides, the nanoscale lycopene particles can easily infiltrate into human cells, which can increase the biological value of lycopene.

The invention relates to an acne-removing composition and a preparation method thereof. The acne-removing composition is characterized by comprising 1%-20% by mass of acne-removing active matter; the acne-removing active matter is composed of 10-15 parts of zinc pyrrolidone carboxylic acid, 4-6 parts of sophorolipid, 5-8 parts of bromelain, 8-12 parts of amur cork tree bark extract, 8-16 parts of purple coneflower extract, 12-18 parts of lithospermum extract, 3-8 parts of humic acid and 40-50 parts of isomalt. The acne-removing composition has the advantages of being excellent in acne-removing effect, safe, stable and convenient to prepare.

The invention provides a preparation method of organic fluorine modified hyperbranched water-based polyurethane. The method comprises the following steps: (1), synthesizing water-based terminal hydroxyl hyperbranched polyurethane core; (2), synthesizing a double bond end capped linear polyurethane prepolymer through diisocyanate, low polymer divalent alcohol, a chain extendor, an end-capping reagent and the like; (3), grafting linear polyurethane onto terminal hydroxyl hyperbranched polyurethane; (4), leading a fluorine element onto a polymer through an emulsion method, so as to obtain the organic fluorine modified hyperbranched water-based polyurethane. According to the organic fluorine modified hyperbranched water-based polyurethane provided by the invention, raw materials are cheap and readily available, and are wide in sources, the synthesis process is simple, and industrialized production is facilitated. The organic fluorine modified hyperbranched water-based polyurethane is appropriate to be used independently, can be matched with other water-based resins, can be applied to the fields of water-resistant paints, environment-friendly water-based adhesives, water-based paints and the like, and has a broad application prospect.