453results about How to "Fast curing rate" patented technology

A thermal interface material composition including a blend of a polymer matrix and a thermally conductive filler having particles having a maximum particle diameter no greater than about 25 microns, wherein the polymer matrix includes an organopolysiloxane having at least two silicon-bonded alkenyl groups per molecule, an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms per molecule and a hydrosilyation catalyst comprising a transition metal, wherein the transition metal is present in an amount of from about 10 to about 20 ppm by weight based on the weight of the non-filler components and the molar ratio of the silicon- bonded hydrogen atoms to the silicon-bonded alkenyl groups ranges from about 1 to about 2. A method is also provided.

The invention relates application of low-viscosity light-cured resin in 3D (three-dimensional) printing materials. The low-viscosity light-cured resin is (branched) polyether acrylate or heterocyclic amine modified (branched) polyether acrylate. A 3D printing material prepared from the low-viscosity light-cured resin is of low viscosity and high curing speed, is low in curing shrinkage, low in yellowing property, moderate in rigidity and flexibility, high in forming speed and high in product dimensional precision, is free of curing incompleteness, edge warping and the like, and is very suitable for being applied to 3D printing materials based on the SLA (stereolithography) or 3DP (three-dimensional printing) technology.

The invention provides an ultraviolet-cured weather-proof self-cleaning coating composition. The coating composition comprises, by weight, 20-30 parts of high-functionality oligomer, 30-50 parts of hydrophilic oligomer, 10-20 parts of acrylic monomer, 4-6 parts of photoinitiator, 3-5 parts of polymerizable surfactant, 0.02-1 part of auxiliary, 0.5-1 part of ultraviolet absorber and 0.2-1 part of light stabilizer. After ultraviolet curing, the prepared coating is high in curing rate, free of high temperature baking and environmentally friendly and saves energy. The coating obtained after curing is good in adhesive force, high in hardness, good in wear resistance and excellent in weather fastness and has a self-cleaning effect.

The invention provides environment-friendly stemming for a blast furnace. The stemming is prepared from aggregate, silicon carbide, titanium dioxide, white mud, coke dust, micropowder and a binding agent. The method for preparing the stemming comprises the following steps: proportioning aggregate, silicon carbide, titanium dioxide, white mud, coke dust and micropowder according to the mass percentage; performing dry mixing and grinding, adding the binding agent, and performing wet mixing and grinding to obtain the environment-friendly stemming for a blast furnace. The stemming has the advantages of small shrinkage rate, excellent thermal shock resistance, excellent washing resistance and excellent erosion resistance, and once tapping time reaches 100-180 minutes; in-situ generated TiC has an effect of protecting the furnace, and the service life of the furnace can be prolonged; T60 carbon-containing resin and phenolic resin are used as the binding agent to reduce generation of cancerogenic smoke and improve the operation environment.

The invention discloses a quick-curing high-strength single-component silane modified polyurethane sealing gum preparation method. The preparation method comprises the steps: adding polyether glycol into a reaction kettle which is provided with a thermometer and a stirrer and protected by dry nitrogen; starting stirring; warming to 120 DEG C; vacuum drying for dewatering for 2h; cooling to 40 DEGC or less; sequentially adding polyisocyanate, a first catalyst and a first plasticizer; warming to 45 to 60 DEG C; reacting and stopping reacting when a NCO% content reaches to 1% to 5%; cooling to 40 DEG C or less; adding a silane coupling agent into the reaction kettle and sealing ends; sampling and detecting NCO% every 15 minutes until the NCO% content is 0 to obtain SPU prepolymer; sealing, storing and standing for standby application. The preparation method disclosed by the invention has the advantages avoiding side reaction under high temperature, effectively controlling a molecular weight of the SPU prepolymer within a narrower range (generally 5000 to 9000), ensuring quality of the prepolymer and effectively improving the curing speed of SPU sealing gum.

The invention belongs to the technical field of epoxy resin curing agent preparation technology, and discloses an epoxy resin solvent-free low temperature curing agent, a preparation method and an application. The curing agent can be better used in cement mortar and used for preparing epoxy grouting material under low temperature in water environment. The curing agent comprises the following components by mass percentage: 79.9-97.2% of modified phenolic amine, 0.8-5.6% of coupling agent, 1.7-9.1% of flexibilizer, 0.1-0.9% of antifoaming agent and 0.2-4.5% of catalyst. According to the invention, thiourea group is introduced, thiourea modified amine, polyamine, long chain alkylphenol and paraformaldehyde are performed a Mannich reaction to synthesize novel thioureido-containing Mannich base, so that solidification rate under low temperature environment is increased, disadvantage of poor solidification efficiency under wet surface and water can be overcome, and a silane coupling agent is added for improving surface tension of system contact surface and increasing the solidification efficiency under water environment.

The invention discloses shelling resistant pre-coated sand and a preparation method thereof. The shelling resistant pre-coated sand is characterized by comprising raw sand, a bonding agent the weight of which is 1-4% that of the raw sand, a curing agent the weight of which is 1-15% that of the bonding agent, 0.1-0.5% of coupling agent and 0.1-1.0% of additive. By adding the additive, the curing speed of the curing agent to the bonding agent is increased, the hardening rate of the pre-coated sand is improved and the shelling tendency is reduced; by optimizing the content of each component, the overall strength of the pre-coated sand is improved, the gas evolution amount of the pre-coated sand is greatly reduced and the defect of core piercing is alleviated; the shelling resistant pre-coated sand has strong shell resistance, is high in strength and low in gas evolution amount, is capable of remarkably alleviating or eliminating defects such as shelling and core piercing and effectively improving qualities of the inner and outer surface of a shell core, and is suitable for production of shell core sand cores.

The invention relates to an epoxy resin concrete material and a microwave-coagulation preparation method thereof and comprises the composition of raw materials, the mix proportion, the preparation method, the mechanics performance testing and the like of the epoxy resin concrete material. The epoxy resin concrete material can be coagulated in a few minutes under the condition of microwave and has the advantages of even coagulation, high strength of condensate, good interface cohesiveness and excellent road performance, thus the concrete material can be used for rapid mending of concrete road surface.

An RTV organopolysiloxane composition is provided comprising (A) a diorganopolysiloxane capped at both ends of its molecular chain with hydroxysilyl, alkoxysilyl or alkoxyalkoxysilyl and having a viscosity of 20-1,000,000 mPa-s at 25 DEG C, (B) a bis(alkoxysilylalkyl)disiloxane compound, and (C) a curing catalyst. The composition is fast curable into a silicone rubber which establishes a firm adhesion to substrates with an active surface such as float glass and maintains the adhesion even in a harsh environment as immersed in hot water over a long term.

The invention mainly aims to provide a photosensitive resin-based carbon source / silicon carbide ceramic slurry, a method for preparing a porous carbon / silicon carbide green body, a reaction sintered silicon carbide structural member and a preparation method of the reaction sintered silicon carbide structural member. The photosensitive resin-based carbon source / silicon carbide ceramic slurry comprises 50-70% of photosensitive resin and 30-50% of a powder material; the powder material comprises silicon carbide powder and phenolic resin powder; and the photosensitive resin comprises a monofunctional monomer, a bifunctional monomer, a trifunctional monomer, a photoinitiator, an adhesion promoter and a polymer dispersant. The preparation method of the porous carbon / silicon carbide green body comprises the following steps: preparing the photosensitive resin-based carbon source / silicon carbide ceramic slurry, carrying out photocuring 3D printing molding, and carrying out vacuum biscuiting; and carrying out high temperature siliconizing sintering. The technical problem to be solved is that a high-density and high-strength reactive sintering silicon carbide structural member can be manufactured, the density of the structural member is greater than or equal to 2.7 g / cm<3>, and the bending strength is greater than or equal to 270.0 MPa, so that the structural member is practical.