31results about How to "No gel" patented technology

The invention discloses a moisturecuring polyurethane hot-melt adhesive suitable for adhering a narrow frame of a mobile phone, and a preparation method of the polyurethane hot-melt adhesive. The polyurethane hot-melt adhesive is prepared by enabling polyether polyol, polyester polyol and diisocyanate to react, and adding acrylic resin, an antioxidant, tackifying resin, phosphoric acid, a catalyst and a silane coupling agent at the same time to obtain the single-component moisturecuring polyurethane hot-melt adhesive. The moisturecuring polyurethane hot-melt adhesive prepared by using the method disclosed by the invention has adjustable opening time, can be cured fast, and is free of gel and high in mobility during adhesive applying. The moisturecuring polyurethane hot-melt adhesive can be applied smoothly by using a 23# needle under a 110 DEG C heating condition, and is specially suitable for structure assembly in a production line of the narrow frame of the mobile phone.

The invention provides an epoxy oligomer chain extender and a preparation method thereof. The epoxy oligomer chain extender can significantly improve the intrinsic viscosity and molecular weight of polyester and nylon type polymer materials and reduce the content of terminal carboxyl groups. The chain extender is prepared from the following components in parts by weight: 50-80 parts of a styrene monomer, 15-25 parts of an acrylic acid glyceride monomer, 5-25 parts of an acrylic acid monomer, 0.1-0.5 part of an initiating agent and 0.1-1.0 part of a chain transfer agent. The preparation method of the chain extender comprises the steps of selecting the reactive monomers and auxiliary agents, adding the monomers and auxiliary agents into a reaction kettle in sequence, and performing polymerization reaction at a certain stirring speed at 120-150 DEG C; drying the reactant to obtain a finished product which is a multi-monomer copolymerized oligomer with low molecular weight. Compared with the existing conventional micro-molecular chain extender, the epoxy oligomer chain extender provided by the invention has the characteristics of simple preparation, wide application range, safety, reliability, high chain extension efficiency, good water resistance, no generation of gel and the like.

This invention relates to a process for synthesizing air-drying epoxy vinyl ester resin. The process comprises: reacting bisphenol A type epoxy resins with low and high epoxy equivalent, and organic unsaturated monocarboxylic acid at 120-160 deg.C in the presence of catalyst and polymerization inhibitor, and then diluting with crosslinkable monomer. The resin has good air-drying performance, with surface drying time less than or equal to 0.5 h, and inner drying time less than or equal to 4 h. Besides, the resin has appropriate viscosity, good wettability with glass fibers and glass mats, good physical and mechanical performance, and good chemical corrosion resistance, and is suitable for various molding processes of fiber reinforced plastics such as manual pasting, coiling, drawing and spraying. The method has such advantages as simple process, low energy consumption, and stable product quality.

The present invention relates to an intelligent paint film material and the preparation method thereof, which mainly realizes sol one-step method to prepare the sol pre-polymerization product with multi-component and multifunctional structure, which is solidified at room temperature and then forms the nanostructure intelligent paint film material. The preparation method is that: metal alkoxide and transition metal coordinated complex are refluxed, hydrolyzed and co-condensed in anhydrous alcohol solvent; or the metal alkoxide and transition metal coordinated complex are hydrolyzed and co-condensed with inorganic metallic salt; or the above composition is refluxed, hydrolyzed and co-condensed with functional sol prepared in advance under the above conditions, producing the sol which is added with stabilizer to prepare a standby product. The product has the functions of photocatalysis intelligent perceiving, self cleaning, air purifying, heat shielding and natural temperature adjusting functions, which can be widely applied to construction industry after the product is solidified and forms film at normal temperature.

The invention discloses a preparation process of polymer modification silicon sol. The preparation process is characterized by comprising the following steps: (1) placing 2,400 mass parts of silicon sol into a reaction container, adding 240 mass parts of deionized water into the reaction container, heating until the temperature rises up to 80 DEG C, and keeping the temperature of 80 DEG C constant until the reaction is completed to form a uniform stable system; (2) keeping the temperature of the system in the reaction container to be 80 DEG C, slowly adding 72 mass parts of polymer modifier which needs to be completely added within 30 min into the reaction container under a stirring state, continuously stirring the reaction system for 5 h at a constant temperature until the reaction is completed to obtain the polymer modification silicon sol, and modifying the pH value of the reaction system to be in a range of 10-11 by using a pH modifier at time intervals of 30 min within 5 h. The process is simple and efficient, and the prepared silicon sol is high in polishing speed, good in hardness, excellent in thermal stability under a long-time storage state, and high in repeated utilization rate.

The invention discloses a graphene slurry for a cationic waterborne polyurethane coating, and a preparation method and application thereof. The graphene slurry for the cationic waterborne polyurethane coating is an aqueous dispersion of modified graphene prepared by modifying graphene oxide with carbodiimide to obtain the modified graphene and then dispersing the modified graphene in water, wherein in the aqueous dispersion of the modified graphene, a ratio of the modified graphene to water is 2-20 mg: 1 ml in terms of the dry weight of the modified graphene. The graphene slurry can be cooperated with cationic waterborne polyurethane resin, so the advantage of long-term stable dispersion is obtained, and the graphene slurry is friendly to environment, long in storage time and free of precipitation, flocculation and gelation after storage at room temperature for one year or more. A coating prepared from the graphene slurry has elastic modulus of 2.2-2.31 GPa and neutral salt spray time of 72 to 120 h.

The invention discloses fluorine containing polymer concentrated dispersion liquid and a method for preparing a fluorine containing polymer from the fluorine containing polymer concentrated dispersion liquid. A surfactant with the molecular structural formula being CF3{(CF2)nC(CF3)2CH2}mCOOH is used as a polymerization dispersant to prepare the fluorine containing polymer, wherein n is an integer ranging from 0 to 4, and m is an integer ranging from 1 to 2. The fluorine containing polymer concentrated dispersion liquid can be used for the process of producing the fluorine polymer through a water-phase dispersion polymerization process, and the uncontrollable molecular weight caused by a surfactant chain transfer reaction is avoided when the fluorine containing polymer concentrated dispersion liquid is especially used for TFE, TFE/HFP, TFE/PPVE and TFE/ethylene polymerization reactions; the surfactant can be used as a substitute for PFOA or one of substitute components and used for water-phase dispersion polymerization of the fluorine containing polymer, and no gel is formed by polymerized emulsion.

The invention discloses graphene slurry for anionic aqueous polyurethane coatings, a preparation method of the graphene slurry and an application. The graphene slurry for the aqueous polyurethane coatings is modified graphene aqueous dispersion, oxidized graphene is modified by carbodiimide to obtain modified graphene, and the modified graphene is dispersed into water to obtain the modified graphene aqueous dispersion. In the modified graphene aqueous dispersion, according to the dry weight of the modified graphene, the ratio of the modified graphene to water is 2-20mg: 1ml. The graphene slurry can be matched with anionic aqueous polyurethane resin to achieve the advantage of long-term dispersion stability, is environmentally friendly and long in preservation time, and is capable of being preserved for at least one year at room temperature without deposition, flocculation or gelling. After use, the elastic modulus of the finally obtained coatings can reach 2.23-2.34GPa, and neutral salt spray time can reach 60-120 hours.

The invention relates to the field of polymer synthesis, and in particular discloses a ternary iron-based catalyst and application thereof to catalyzing epoxy chloropropane and butadiene to prepare a novel polymer through copolymerization. The application to preparing the novel polymer is characterized by comprising the following steps: enabling the ternary iron-based catalyst to react in a hydrocarbon solvent, wherein epoxy chloropropane and butadiene are adopted as reaction substrates; performing a reaction for 1-24 hours at 0-100 DEG C, terminating the reaction after polymerization is completed, washing for multiple times with ethanol, adding an anti-aging agent, and drying to obtain a target product. As the ternary iron-based catalyst (an iron compound, an organic aluminum compound and an electron donor) is adopted to catalyze copolymerization of epoxy chloropropane and butadiene, the molecular weight of an obtained polymer is 10,000 or above, the polymer is light in color, the PDI is about 1.0-2.0, and the reaction is stable and easy to control.

The invention discloses a preparation method for an acrylate-modified epoxy resin cathode electrophoresis emulsion. The method adopts a monoprotic organic acid containing a double bond and a biproticorganic acid containing a double bond or/and an acid anhydride to react with epoxy resin, double bonds are introduced into a main chain of the epoxy resin, acrylic resin is grafted into the epoxy resin by utilizing copolymerization of the double bonds and an acrylate monomer, more acrylic resin can be introduced onto the main chain of the epoxy resin, adjustment and control of an introduction amount of the acrylate monomer are achieved through control of the content of the double bonds, and a molecular weight of the main epoxy resin is adjusted through a ratio of carboxyl to epoxy groups; themain body of the prepared product is epoxy resin, so that good anticorrosive performance of a paint film is guaranteed; and when the epoxy resin is aminated, two different organic amines are added step by step for a reaction, so that the reaction process is milder. According to the method disclosed by the invention, the acrylate-modified epoxy resin emulsion prepared by the method has good performance of a paint film and good ultraviolet and salt spray resistance, and can be used for workpieces under conditions of exposure under the sun.

The invention provides a siloxane ketone aluminum corrosion inhibitor, and belongs to the technical field of aluminum corrosion inhibitors. The invention further provides a preparation method of the siloxane ketone aluminum corrosion inhibitor. The structure of the aluminum corrosion inhibitor is an organosiloxane derivative with a sodium sulfonate group, and the sulfo structure weakens the limitation of the pH of a formula system on the corrosion inhibitor, so that the aluminum corrosion inhibitor can be universally applied to metal working fluids such as an acidic cleaning agent, an alkaline cutting fluid and a refrigerating fluid without generating gel and precipitate; the organic siloxane structure increases the compatibility of the corrosion inhibitor in the formula, and the addition amount of the corrosion inhibitor in the formula can be increased so as to achieve the optimal corrosion inhibition effect.

The invention discloses an aluminum-plastic panel refurbishing facing paint which is selected from the following components in parts by weight: a component A and a component B. The component A comprises predetermined parts by weight of white cement, quartz powder and cellulose ether. The component B is prepared from the following components in parts by weight: 6.9-8.1 parts of water, 70-82 parts of polyacrylic emulsion, 6.92 parts of titanium dioxide slurry, 0.04-0.06 part of a thickening agent, 0.1-0.15 part of a buffering agent, 0.30-0.40 part of a defoaming agent, 0.15-0.25 part of a wetting agent, 0.1-0.2 part of a water retaining agent, 0.8-1.0 part of a dispersing agent and 6.0-7.0 parts of a film-forming agent. The components above are stirred and mixed to prepare the aluminum-plastic panel refurbishing facing coating, and the aluminum-plastic panel refurbishing facing coating is coated on the surface of a base body in a rolling manner to finish construction. The coating is freeof gel, peeling and falling off under the condition of 100 DEG C (+/-2), and is easy to construct.