145results about How to "Extended gel time" patented technology

A fast curable non-isocyanate-based polyurethane- and polyurethane-epoxy network nanocomposite polymeric compositions are derived upon crosslinking a mixture comprising of natural or modified nano-clay [ionic phyllosilicate] with platelet thickness in the scale of A (˜1 nm) and aspect ratio (length/thickness) higher than 10 (nm)] preferably natural or modified montmorillonite with either a monomer(s) or oligomer(s) bearing at least one cyclocarbonate group or a mixture of the latter with an epoxy resin, with a hardener, which is a monomer or oligomer or mixtures therefrom, bearing primary and/or secondary amino groups. The use of the nanoclays reduces the gel time and increases the adhesion of the cured polyurethane and polyurethane/epoxy hybrid and also reduces its water absorption.

A method for extending the gelation time of an oxidized polysaccharide to react with a water-dispersible, multi-arm amine to form a hydrogel is disclosed. The extension of the gelation time is accomplished by using a chemical additive. The method also extends the time for the hydrogel to become tack-free, and may also be used to decrease the degradation time of the hydrogel. The chemical additive reacts with the functional groups of the oxidized polysaccharide or the water-dispersible, multi-arm amine, thereby reducing the number of groups available for crosslinking. The use of the resulting hydrogel for medical and veterinary applications is described.

The invention relates to an epoxide resin and the use. The epoxide resin comprises an epoxide, the reacting deflocculating agent and the curing agent, wherein the reacting deflocculating agent is a monomer or oligomer of acrylate and methacrylate with the low viscosity in the ambient temperature and a or a plurality of unsaturated double bond reactive function group, the reacting deflocculating agent is charged in the epoxide resin and is mixed uniformly in order to form the host crystal of the epoxide formulation, the host crystal comprises the reacting deflocculating agent 5-30 parts and agent B which forms epoxy resin formulation comprised by curing agent, the weight percentage of the agent B and the host crystal is 20-50 :100. The invention can improve the gel time, the temperature of exothermic peak and the processing operation characteristic of viscosity in the hardening process of the epoxide, which reduces the mechanical properties of the cured epoxide less, improves the tenacity of the epoxide, is suitable for manufacturing structural element of large scale composite material (air vane, craft, car and aerial craft and the like), and has good operation time, low exothermic peak temperature and fiber immersing property.

This invention relates to compositions and methods for improving the adhesion of resin compositions to substrate materials, pre-treating substrate materials to improve the adhesion of resin compositions to the substrate materials, and/or controlling gel formation of resin compositions. More particularly, the invention relates to compositions and methods for improving the adhesion of ring opening metathesis polymerization (ROMP) compositions to substrate materials using adhesion promoters containing isocyariate groups in a resin composition. The invention also relates to methods for improving the adhesion of resin compositions to substrate materials by pre-treating substrate materials with adhesion promoters containing isocyanate groups. The invention further relates to a method of providing a gel-modified ROMP composition, in which a hydroperoxide is added to a ROMP polymerizable resin composition in order to control gel formation of the polymerizing resin. An improved ROMP composition is further disclosed, comprising a cyclic olefin, a ROMP metathesis catalyst, an adhesion promoter, and an added hydroperoxide gel modifier. The polymer products produced via ROMP reactions of the invention may be utilized for a wide range of materials and composite applications. The invention has utility in the fields of catalysis, organic synthesis, and polymer and materials chemistry and manufacture.

The invention discloses a method for preparing preparing silicon dioxide aerogel powder, which comprises the following steps: adding acid into sodium silicate solution to make a pH value equal to 3 to 6; adding a chemical drying control agent into mixture and standing to form gel; after the gel is sufficiently aged, adding an azeotropic distillation organic solvent into the gel to distill to form a primary dried product; and drying the primary dried product to form silicon dioxide aerogel powder. The method uses the common commercial sodium silicate as the raw material to prepare the silicon dioxide aerogel powder and has the advantages that the raw material is easily obtained; the normal pressure is used for preparation; the chemical drying control agent is adopted to prolong the gelation time to promote uniformity of the gel structure; an azeotropic distillation drying process is adopted to control a stress level when the solvent is dried; a pore volume and a specific surface area of the silicon dioxide aerogel are controlled; the pore volume reaches 1.2 to 3.0ml/g; the specific surface area reaches 300m2/g to 800m2/g; and compared with the normal pressure drying, the drying time is shortened and the like. The organic solvent is easy to realize recycling. And the production process is simple and the production cost is low.

Bi-component epoxy resin pouring sealant and the preparation and the potting technology are disclosed, which comprises an epoxy resin A component and a cursing agent B component, wherein the curing agent B component at least comprises the mixing curing agent of cashew shell oil modified amine curing agent and fatty amine curing agent. The potting technology comprises mixing and stirring evenly the epoxy resin A component and the curing agent B agent to conduct the potting, and spraying a layer of absolute alcohol on the surface of the pouring sealant after 10-15 minutes. The advantages are that gel time is prolonged through adopting the mixing curing agent of cashew shell oil modified amine curing agent and fatty amine curing agent, the requirement of operation time is fulfilled, and the operation time can reach 20-30 minutes, thereby being beneficial for the encapsulation of housing with large capacity, and the pouring sealant of the invention has the effect of fast curing, wherein the curing time is 1-3 hours, and defoaming is accelerated through spraying a layer of absolute alcohol on the surface of colloid after pouring, thereby making the solid gel surface bright and flat after curing.

The invention discloses a scraping coating type polyurea elastomer corrosion-resistant and wear-resistant material and a preparation method thereof. The scraping coating type polyurea elastomer corrosion-resistant and wear-resistant material is characterized by comprising an ingredient A and an ingredient B, wherein the ingredient A is prepolymers with NCO end groups obtained through the reaction between 30 to 40 mass percent of polyether polyol and 60 to 70 mass percent of polyisocyanates; the ingredient B is prepared from 30 to 40 mass percent polyaspartic acid ester, 60 to 70 mass percent of filling materials and a small number of auxiliary agents through high-speed dispersion grinding. In the use process, the prepared ingredient A and the prepared ingredient B are weighed according to the weight ratio of 1:4, and are then uniformly mixed; next, scraping coating construction is performed. The material has the characteristics of high mechanical intensity, corrosion resistance, wear resistance, good anti-seeping performance, aging resistance, proper reaction speed, no solvent, convenient construction and the like. The scraping coating type polyurea elastomer corrosion-resistant and wear-resistant material is particularly suitable for industrial and mining enterprise equipment and spare part anti-corrosion wear-resistant liners.

The invention relates to a novel inorganic-organic ternary composite plugging agent for oil extraction and a preparation method. The invention adopts the technical scheme that: the plugging agent is prepared by mixing 8 to 12 percent of water glass of which the modulus is 3.3, 0.1 to 0.3 percent of polyacrylamide and 0.3 to 0.8 percent of water-soluble phenolic resin and the balance of phosphoricacid and water, wherein the phosphoric acid is used for adjusting a pH value. Under the condition of overcoming short gelation time and relatively weak gelation intensity of inorganic silicic acid, inorganic-organic plural gel which has the characteristics of relatively long gelation time at the temperature of less than 70 DEG C, high gelation intensity, certain tenacity and difficult cracking isprovided and is suitable for different stratum environments.

The invention provides a polishing layer of a chemical-mechanical polishing pad and application of the polishing layer. The polishing layer is prepared by the reaction of isocyanate prepolymer, a curing agent and functional filling; the isocyanate prepolymer is prepolymer prepared by the reaction of raw materials including diisocyanate, polyether ester polyol and optional small molecular polyol; the curing agent is dispersion liquid formed in dioctyl adipate by a complex of diamine compound and sodium chloride, wherein concentration of the complex is 40 wt%-50 wt%; and the functional filling is expanded polymer hollow microspheres. The polishing layer has higher mechanical strength and abrasive resistance while having high elasticity and hydrolysis resistance, so that the durability of thepolishing layer is good.

The invention belongs to the technical field of spraying polyurea elastic materials, and discloses a polyaspartatepolyurea coating witha moderate surface drying time and adaptability to environmentalchanges, which is prepared from a A material and a B material. The mole ratio of NCO in the A material to NH in the B material is 1.05:1.1. The A material is mainly prepared from,by weight,25-44% of polyether polyol, 55-74% of aliphatic polyisocyanate and 1-5% of nanographene oxide; the B material is mainly prepared from, by weight,70-80% of polyaspartate, 10-15% of nano metal oxide filler, 5-10%of pigment and filler, 1-3% of defoaming agent, 1-3% of leveling agent and 2-5% of adhesion promoter. The invention further provides a preparation method and use method and application of the polyaspartatepolyurea coating. The polyaspartatepolyurea coating has the advantages of being easy to brush, moderate in the surface drying time, and capable of adapting to the environmental changes.

The invention discloses a polyurea waterproof and corrosion-resistant coating of graphene modified amine-terminated polyether. The coating comprises a component A and a component B, wherein the component A is a quasi-prepolymer which is prepared from isocyanate, amine-terminated polyether and a diluent through reactions; the component B is prepared by the following steps: firstly, preparing graphene oxide; secondly, carrying out carboxylation treatment on the graphene oxide; thirdly, carrying out ultrasonic dispersion on the carboxylation graphene oxide into a dimethyl formamide (DMF) solution; under the action of a dehydration agent, modifying the amine-terminated polyether by using the carboxylation graphene oxide; carrying out reduction treatment on the amine-terminated polyether aftercarboxylation graphene oxide modification by using a chemical reduction method; finally, mixing the graphene modified amine-terminated polyether, a chain extender and aids, thereby obtaining the component B. The waterproof and corrosion-resistant coating is simple in process, green and environmentally friendly in process and has the characteristics of being good in waterproof and corrosion-resistant property, good in adhesiveness, slow in reaction speed, controllable in gelation time, and the like.

Polydicyclopentadiene (PDCPD) is a polymer of growing importance in industrial applications. Frontal ring-opening metathesis polymerization (FROMP) offers a means to rapidly cure PDCPD with minimal input energy owing to a propagating reaction wave sustained by the exothermic polymerization. The disclosure provides methods for the rapid fabrication of fiber reinforced composites that is less restrictive and more energy efficient than conventional methods.

The invention relates to the technical field of adhesives, in particular to a reactive thickening type two-component polyurethane glass adhesive and a preparation method thereof. The preparation method comprises the following steps of: mixing and stirring a component A and a component B in a volume ratio of 1: 0.8-1.2 for 5-20min to prepare the glass adhesive. The component A comprises 40-75% of atwo-component polyurethane prepolymer, 1-15% of polymethylene polyphenyl isocyanate, 20-40% of a reinforcing filler A, 0.1-2% of a catalyst A, 0.1-2% of an adhesion promoter A and 0.1-2% of a water removal agent. The component B comprises 30-65% of a low-activity cross-linking agent, 1-10% of a high-activity cross-linking agent, 20-40% of a reinforcing filler B, 10-25% of a plasticizer B, 0.1-2%of a catalyst B and 0.1-2% of an adhesion promoter B. The preparation method of the invention has simple operation, convenient control, low production cost and high product quality, and can be used for large-scale production.

The invention belongs to the technical field of powder coatings, in particular to polyester resin for a high gloss powder coating and a preparation method thereof and application thereof in preparinga 50/50 type powder coating. The polyester resin for the high gloss powder coating is prepared by polymerization of octadecanedioic acid, isophthalic acid, 4-trifluoromethylsalicylic acid, 2,6-Bis(hydroxymethyl)-p-cresol, neopentyl glycol, glyceryl isostearate, 1,6-hexanediol dimethacrylate, and 2,3-quinolinedicarboxylic acid as raw materials. The obtained polyester resin product has better structural flexibility and long flow time, has high surface gloss after curing into a film while ensuring mechanical properties, and can be used in the 50/50 mixed powder coating for obtaining a high glosscoating board surface.

The invention discloses a method for producing an alumina silica gel anchoring agent for corundum mullite composite ceramic, which comprises: using silicasol and alumina colloid as raw materials, controlling PH of the alumina colloid, using sol-gel processing to produce the alumina silica gel, controlling the content of alumina silica by dewatering in the alumina silica gel producing process, and controlling the gelling time by adding ammonial solution or acetylacetone, controlling the crystal system of mullite phase produced from burning process of the alumina silica gel by adding the aluminun trifluoride mineralization agent. The alumina silica gel can be used in the ceramic and fire resistive materials producing process as the anchoring agent, also can be used in production of mullite super fine. The crystal form can be controlled by adding the mineralization agent to improve the capacity of the ceramic and fire resistive materials.

The invention provides a polyurethane gel coat combination capable of spraying blades of a fan conventionally and a preparation method of the polyurethane gel coat combination. The combination is prepared by the following steps: mixing polyester polyol and an isocyanate curing agent according to a certain proportion to serve as a main film former, and adding a filler, a pigment, auxiliaries and areaction regulator. The reaction regulator includes a drier and a retardant, and the retardant includes one or more Louis acidic compounds having double-teeth ligand structures. Therefore, the gelation time of the polyurethane gel coat is effectively prolonged, the spraying operation can be realized with conventional coating equipment, the current reality that solvent-free gel coats for the blades of a fan can only be coated in a roller coating way or by adopting special equipment is changed, not only is the excellent protecting performance of the solvent-free polyurethane gel coats realized,but also the fine processability of the solvent-free polyurethane gel coats is realized. The invention also provided a preparation method of the polyurethane gel coat combination. The polyurethane gel coat combination prepared according to the invention also has the excellent properties of being tough and tensile, wear-resisting, sand-wind-resisting, ultraviolet-resisting and ageing-resisting andthe like.

The invention discloses a compound type water treatment flocculating agent and a preparation method thereof and belongs to the field of waste water treatment. The flocculating agent is prepared from ferrous sulfate, sodium silicate, zinc salt, magnesium salt, hydrogen peroxide, concentrated sulfuric acid, and distilled water and the preparation method comprises the steps of activating, oxidation, mixing, curing and the like. The compound type water treatment flocculating agent disclosed by the invention has the benefits of simple preparation technology, low cost, high convenience in product application and good stability, is suitable for flocculation treatment of sewage and has good effects on sewage in COD reduction, phosphorous removal and de-coloration.

The invention provides a method for preparing low-melting-point quarternary BZBS (BaO-ZnO-B2O3-SiO2) glass by virtue of a sol-gel method. The method comprises the following steps: 1) preparing ethyl orthosilicate pre-hydrolysate; 2) preparing sol; 3) preparing xerogel; 4) firing glass; and 5) grinding and screening the obtained xerogel to obtain xerogel powder, pretreating the xerogel powder in a muffle furnace, then carrying out firing at a temperature of 950-1050 DEG C for 0.5-1.5 hours, and then rapidly cooling to the room temperature on a steel plate to obtain low-melting-point quarternary borate glass. The method is reasonable in process condition, a gel structure of the glass is a network structure formed by SiO2 and B2O3 together, and the glass is microcrystalline glass, is good in wetting property, good in clarification effect, strong in crystallizing capability and best in comprehensive performance.

The invention provides a grouting material and a preparation method thereof, and belongs to the technical field of underground engineering materials. The grouting material provided by the invention comprises the following raw materials: 760-800 parts of clay, 80-120 parts of cement, 30-70 parts of bentonite, 700-800 parts of water, 5-15 parts of water glass and 1-5 parts of a water reducing agent.According to the invention, bentonite is used for improving the clay basic slurry, and complex reaction with a cement hydration product is carried out, so that the water flushing release resistance,strength and permeation resistance of the slurry are improved, and the product has excellent economical efficiency; the water glass accelerates the gelling time of the material and generates relatively stable micelles with the clay cement slurry; the water reducing agent reduces the porosity of the material and improves the strength and impermeability of the material. The initial setting time of the grouting material is 75min, the final setting time of the grouting material is 135min, and the slurry retention rate reaches 93.82% when the water flow speed is 0.5m/s after grouting.