69results about How to "Short opening hours" patented technology

The invention relates to an ethylene-vinylacetate (EVA) copolymer resin hot melt adhesive with high melting point, fast curing and low melting viscosity. The hot melt adhesive comprises the following components in parts by weight: 40-60 parts of ethylene-EVA copolymer resin, 20-40 parts of tackifying resin and 10-30 parts of synthetic wax. The hot melt adhesive is especially suitable for splicing the paper filter element of the air cleaner.

The invention provides a method and a device for measuring distance in a passive optical network, and relates to the field of communication. The method comprises the following steps of: acquiring route time delay (RTD) between an optical line terminal (OLT) and an optical network unit (ONU); and opening a quite window for measuring distance for the ONU according to the RTD to measure the distance for the ONU.

This rice cooker is equipped with a pot to house water and rice, a heating means, a pressure valve to make the inside of the pot communicate with the outside air or cut off, and a control means for the heating means and the pressure valve. The rice to be cooked is processed by a starting-up process to rapidly heat rice and then a boiling keeping process wherein the rice to be cooked is heated by the heating means when the pressure valve is open.The invention provides a rice cooker in which rice can be sufficiently agitated during boiling and uniformly cooked, and the upper face of cooked rice is flat causing visual artistic effect after rice is completely cooked.

The invention relates to a polyurethane or polyurethane-urea aqueous dispersion with excellent heat-damp resistance performance, and a preparation method and application thereof. Polyurethane or polyurethane-urea is prepared through a reaction among at least one siloxane component with at least two NCO reactive functional groups, at least one siloxane component with at least one NCO reactive functional group, at least one polyol component with the functionality of 2-4, at least one polyisocyanate component, at least one hydrophilic compound component, at least one NCO reactive, monofunctional,nonionic and hydrophilic compound and the like. The polyurethane or polyurethane-urea aqueous dispersion has the excellent heat-damp resistance performance, thereby being suitable for preparation ofhigh-quality paint and sealants, especially adhesives.

The invention provides a hot-melt polyurethane adhesive with high initial adhesion. The hot-melt polyurethane adhesive comprises, by weight, 70 to 90% of polyurethane prepolymer and 10 to 30% of an adhesion promoting agent, wherein the adhesion promoting agent is prepared through addition of rosin acid, one-component or two-component epoxy, and hydrogenated rosin or any cyclic compound with a carboxyl group or natural resin. The invention has the following unique beneficial effects: 1, the active adhesion promoting agent is produced through addition of natural resin or a related cyclic compound with the carboxyl group and epoxy for the first time, and is applied to the reactive polyurethane adhesive; and 2, the novel two-step preparation method has not been reported and used so far. The novel two-step preparation method can prepare a hot-melt polyurethane adhesive product with high initial adhesion without changing a formula for the hot-melt polyurethane adhesive. The hot-melt polyurethane adhesive product has creep resistance reaching the grade of 3, 500 g, and has superior heat stability. Due to high adhesive capability and arbitrarily-adjustable hot opening time of the product, the hot-melt polyurethane adhesive product can be applied to industrial places like the shoemaking industry and engineered floors with high requirements on initial adhesion.

The invention relates to a preparation method of a light/humidity dual-curing polyurethane hot melt adhesive. The preparation method comprises the following steps of: introducing N2 into an HDI (hexamethylene diisocyanate) tripolymer, removing water vapor, carrying out a protective reaction, respectively adding a polymerization inhibitor and a catalyst and dropwisely adding HEA (hydroxyethyl acrylate); after dropwisely adding and reacting, adding polyisocyanate, and stirring uniformly to obtain 3HDI-HEA/polyisocyanate; heating and fusing polyalcohol and stirring for dehydration; adding the 3HDI-HEA/polyisocyanate and the catalyst; discharging after reacting, packaging the sample with an aluminum foil bag for standby application to obtain a light/humidity dual-curing polyurethane hot melt adhesive prepolymer; melting the prepolymer, and adding a photoinitiator, a polymerization inhibitor, a plasticizer and the catalyst, stirring uniformly in a molten state, rising the temperature and removing air bubbles; and ending stirring and discharging to obtain the light/humidity dual-curing polyurethane hot melt adhesive. The obtained hot melt adhesive has high initial bonding strength and final strength.

The invention discloses a water-repellent admixture for mortar and concrete. The water-repellent admixture for mortar and concrete is compounded of organosilicone emulsion, water, a concrete shrinkages reducing agent, a defoaming agent, a water reducing agent, a cement hydrating accelerant, a lithium compound and an air entraining agent, wherein the organosilicone emulsion is of a core-shell structure and prepared by soap-free polymerization and the particle size of emulsion particle is less than 200nm. When 1% of water-repellent admixture is added to mortar, the permeable pressure ratio of the obtained water-repellent mortar layer is not less than 420%, and the water absorption capacity within 48 hours is not greater than 48%; and when 0.2% of water-repellent admixture is added to concrete, the permeable height ratio of the obtained water-repellent concrete layer is not greater than 15%, the water absorption capacity within 48 days is not greater than 26%, and the shrinkage ratio within 28 days is not greater than 102%. The water-repellent admixture contains a core-shell spherical particle polymer with nanoscale and also contains shrinkages reducing agent, air entraining agent, lithium salt and other compounds which have different functions, and thus the anti-permeability, the water-repellent performance and the durability of the water-repellent layer can be greatly improved, the cracking can be avoided, and the toughness is also improved; and the water-repellent admixture is safe, nontoxic, simple in production, environment-friendly, low in cost, simple in structure, and short in open time.

The invention provides a method for preparing linear copolyester hot melt rubber, which includes the following steps: (1) dimethyl terephthalate and diol are done with transesterification reaction under the effect of catalyst; (2) aliphatic series dibasic carboxylic acid and stabilizer are added into the product of step (1), obtaining copolymer by decompression and copolycondensation, and obtaining the hot melt rubber. The method for preparing the linear copolyester hot melt rubber adopts linear symmetrical dibasic carboxylic acid as raw material, and the linear copolyester hot melt rubber obtained with diol is characterized by being strong in adhesive strength, fast in crystallization speed, and resistant in water washing and dry washing, and is especially suitable for preparing the corresponding glue film or two sided rubber net interface product.

The invention provides a composition and its preparation method and use. The composition comprises, by weight, 35 to 40% of white cement, 45 to 50% of steel slag powder, 10 to 15% of heavy calcium powder, 0.1% of a water repellent, 0.15% of a water-retaining agent, 0.4% of lignin fibers, 1% of re-dispersible latex powder and 0.075 to 0.25% of a water reducer. The invention discloses the preparation method of the composition and a use of the composition as a tile-seam filling agent. The composition can reduces use amounts of an iron oxide pigment and cement, utilizes industrial by-products, realizes resource comprehensive utilization, is environmentally friendly, utilizes wastes, improves tile-seam filling agent workability, improves early-stage and later-stage strength of the tile-seam filling agent, reduces shrinkage cracks of the tile-seam filling agent in later-stage curing, and improves peaceability, application properties and thermal adaptability of a cement mortar system.

The invention discloses a preparation method of a low-melting-point copolyamide hot melt adhesive, which includes the steps of adding binary acid consisting of lactam and a mixture of adipic acid andlong carbon chain binary acid having 10 to 14 carbon atoms, diamine consisting of a mixture of short carbon chain diamine having 6 to 8 carbon atoms and long carbon chain diamine having 10 to 14 carbon atoms, a molecular weight modifier, an antioxidant and water to a kettle; first performing nitrogen replacement; then raising the temperature to 120 DEG C and starting to stir; continuing to raise the temperature to 230 DEG C, keeping the pressure rising continuously, and performing reaction at the pressure of 1.3 MPa to 1.5 MPa and temperature of 230 DEG C to 250 DEG C for 1.5 h; reducing the pressure to atmospheric pressure, adding inorganic filler, performing reaction for another 2 hours, and then pressurizing and discharging a material. The obtained copolyamide hot melt adhesive preparedby the preparation method of the invention has the advantages of low melting point, stability, short opening time, appropriate melt index, good bonding effect, and excellent water washing resistanceand dry cleaning resistance.

The invention relates to the technical field of hot melt adhesives, in particular to an EVA hot melt adhesive special for furniture box sealing and a preparation process thereof. The EVA hot melt adhesive at least comprises the following components by weight percentage: 20-50% of a vinyl acetate-ethylene copolymer, 30-60% of tackifying resin, 0.1-2% of an assistant and the balance wax. The hot melt adhesive provided by the invention solves the problems that a common hot melt adhesive is short in opening time and low in strength, is not suitable for the high strength requirement of ultra-largeweight of furniture, is easy to rebound and come apart in carton sealing for large-size furniture, and is not suitable for sealing of cartons with long length. The EVA hot melt adhesive provided by the invention is especially suitable for sealing heavy furniture packaging cartons, and has the advantages of high bonding strength, good strength, bearability of the weight of super-large furniture, environmental protection, long opening time, adaptation to the super-long length of furniture cartons, good toughness, high rebound resistance and the like.

The invention provides an environment-friendly carton positioning adhesive which is prepared from the following formula components in parts by mass: 18 to 22 parts of Fischer-tropsch wax SX105, 16 to 23 parts of EVA28150, 16 to 23 parts of EVA28400, 30 to 38 parts of hydrogenated petroleum resin FM and 4 to 7 parts of water-white rosin 1100. The environment-friendly carton positioning adhesive is reasonable in design, good in adhesion effect and high in production efficiency, and the production cost is reduced.

The invention belongs to the technical field of polyurethane aqueous dispersions, and particularly relates to a polyurethane or polyurethane-urea aqueous dispersion, a preparation method and application thereof, and the polyurethane or polyurethane-urea is prepared by reaction of raw materials comprising the following components: a) a compound containing a tertiary amine group and at least one NCO reactive functional group, b) polyester polyol having a number average molecular weight of 400-5000 and a functionality of 2-3, c) an organic compound having at least two isocyanate groups, d) a hydrophilic compound containing one or more of an ionic group, a latent ionic group and a nonionic group and containing 2-3 NCO reactive functional groups, and e) a monofunctional nonionic hydrophilic compound containing at least one NCO reactive functional group. The aqueous dispersion disclosed by the invention is stable in storage and long in storage time, the hydrolysis resistance of an adhesive prepared from the dispersion is improved, and meanwhile, relatively good bonding strength and heat resistance of the aqueous dispersion can be maintained.

The invention discloses a method for preparing PNT (para nitro toluene) copolyester hot melt adhesive used for film manufacturing. The method comprises the following steps: (1) terephthalic acid, isophthalic acid, neopentyl glycol and 1,3 propylene glycol have an esterification reaction under the action of titanium catalysts; (2) stabilizers and anti-oxydants are added to products of the step (1), so a pressure-reduction condensation polymerization reaction is conducted, and the PNT copolyester hot melt adhesive which is used for film manufacturing and is high in crystallization speed and short in opening time can be obtained.

The invention discloses a mechanical spraying-fluorgypsum-reflective insulation paint enclosure insulation composite wall system for a steel structure. The insulation composite wall system comprises an interior insulation system and an exterior insulation system. The interior insulation system and the exterior insulation system share a substrate layer. The insulation composite wall system successively comprises, from interior to exterior, an interior facing layer, an interior protection, an interior insulation layer, an interior fireproof layer, an interior interfacial layer, the substrate layer, an exterior interfacial layer, an exterior fireproof layer, an exterior insulation layer, an interior protection layer and an exterior facing layer. According to the invention, the insulation composite wall system employs fluorogypsum modification technology, reduces consumption of energy resources and pollution and protects natural resources and ecological environment; moreover, utilization of industrial by-product gypsum is broadened, considerable solid waste is consumed, environmental pollution is mitigated, energy consumption in building is saved, and a steel structure industry is turned into a novel energy-saving environment-friendly large industry with low energy consumption and capacity of consuming industrial solid waste.

The invention discloses a vacuum washing rotary classification garbage can with a vegetable washing pool on top. The garbage can comprises a box body. A sealing door is arranged on the lower part of the box body. The vegetable washing pool is arranged on the top of the box body. A water discharge pipe, a throwing opening and a throwing door are arranged at the bottom of the vegetable washing pool.A washing mechanism is arranged in the box body. A discharge port is arranged on the lower part of the interior of the box body. A plurality of isolation hoppers are arranged on the part, between thethrowing door and the discharge port, of the box body. The interior of the box body is divided into a plurality of cavities which are arranged vertically. Each cavity is connected with a vacuuming mechanism independently. An isolation door is arranged at the bottom of each isolation hopper. A slant classification pipe is in butt joint with the lower part of the discharge port. On the premise thatthe size of the garbage can is not changed, the internal space of the garbage can is made full use of; more storage barrels are arranged to meet the requirement for classification of various garbage;the vegetable washing pool is used in combination with a garbage can body, the space is made full use of reasonably, the problem that in the prior art, when a user opens a garbage can cover and throws garbage into the garbage can, the smell of the garbage inside goes upwards and spreads outwards is solved, and the indoor air environment is protected.

The invention provides a toe box and heel cap material for shoes and a method of manufacturing the toe box and heel cap material for shoes. The toe box and heel cap material for shoes comprises a sandwich layer and a surface layer wrapping the same, wherein the sandwich layer is made of 100 parts of polyurethane, 60 parts of low-temperature polyester, 5 parts of triethylene diamine, 3 parts of stannous octoate, 5 parts of 1,4-Butanediol, and 6 parts of trimethylolpropane, and the surface layer is made of 100 parts of hot melt glue level polyurethane and 30 parts of thermoplastic elastomer. The hardness and strength of the toe box and heel cap material for shoes are improved further, the toe box and heel cap material is easy to trim and excellent in bending resistance, the toe box and heel cap material is active at low temperature and free of glue overflow, opening time is shortened so that the material can be shaped quickly, and the toe box and heel cap material has high bonding power. Leftover obtained by trimming the material can be recycled and reused. By the method of manufacturing the toe box and heel cap material for shoes, manufacturing procedures are simplified for enterprises, operation is facilitated for shoe makers, and production efficiency and labor intensity are reduced for the shoe makers.