1553 results about "Melamine formaldehyde resin" patented technology

The invention discloses a microencapsulation expansion type flame retardant and application in an epoxy resin composite material thereof. The microencapsulation expansion type flame retardant uses ammonium polyphosphate as a capsule core and uses a thermosetting resin melamine-formaldehyde resin as a capsule material. The microencapsulation expansion type flame retardant epoxy resin composite material consists of the epoxy resin, a curing agent, a curing accelerator, the microencapsulation expansion type flame retardant and a flame-retardant carbon-forming accelerator. The microencapsulation expansion type flame retardant and the application are economic, simple and convenient; the flame retardant has good flame-retardant synergistic effects; and under the condition of little flame retardant addition, the composite material can pass V-0 level of UL-94 test, and the oxygen index reaches over 30.0 percent.

A warm-mix asphalt additive machine preparation method, the additive is formed by reacting the following components in parts by weight: 4-15 parts of alkoxysilane, 1-8 parts of polyether, 0-1 part of melamine formaldehyde resin, and 0 parts of acid catalyst -1 part, 0-1 part of alkali catalyst, 2-10 parts of deionized water, 30-100 parts of solvent; the preparation method comprises the following steps: (1) adding a quantitative amount of solvent and Alkoxysilane, heated to 80°C; (2) Add a mixture of acid catalyst, base catalyst, and deionized water, and react at a constant temperature of 80°C for 90 minutes; (3) Heat up to 100°C, condense and reflux for 120 minutes, and collect about 55ml of distillate; ( 4) Add an acid catalyst and a certain amount of polyether into the flask, heat up the esterification reaction for 180 minutes; (5) evacuate, condense and reflux for 30 minutes, cool down to room temperature, add a certain amount of melamine formaldehyde resin and stir evenly, add an appropriate amount of alkali catalyst to adjust the pH = 8 or so, the finished product is obtained.

The invention discloses a preparation method and an application of an aromatic microcapsule finishing agent with double-layer wall materials. The method is characterized by preparing the aromatic microcapsule through covering the lavender essence oil capsule core material with the melamine-formaldehyde resin cyst wall and mixing the aromatic microcapsule with an adhesive (VAE) vinyl acetate-ethylene solution as the external wall material, thus generating the aromatic microcapsule finishing agent with double-layer wall materials. Aroma after-finishing on is carried out on the cotton fabrics by adopting the finishing agent and a padding method and the aromatic microcapsule is firmly fixed on the fibers of the cotton fabrics via own external wall with good adhesiveness, so the cotton fabrics have lasting aroma.

The present invention discloses a preparation method for melamine formaldehyde resin closed-cell foam. The preparation method comprises the following steps: introducing a modifier to a melamine formaldehyde resin synthesis process to carry out copolymerization, and carrying out a dehydration treatment on the synthesized resin to obtain a modified melamine formaldehyde solid resin with a solid content of more than 85%; adding a viscosity adjusting agent, dissolving the solid resin, respectively adding a curing agent, a foam stabilizer, an emulsifier and a foaming agent, and uniformly stirring; placing the resulting mixture in an oven or a microwave oven to carry out foaming to achieve a predetermined density; and placing the resulting material in the oven or the microwave oven to carry out aging to obtain the melamine formaldehyde foam with a closed-cell rate of more than 90%. The melamine formaldehyde resin closed-cell foam produced by the preparation method has excellent mechanical strength and flame retardant property, and can be applicable for building exterior wall thermal insulation.

The invention discloses a method for producing melamine formaldehyde resin/polyvinyl alcohol flameproof fiber. The invention is characterized in that composing melamine and formaldehyde at the mole ratio as 1:1.2-1:6 and 50-100Deg. C into melamine formaldehyde resin water solution, to be mixed with the polyvinyl alcohol water solution at the solid content ratio as 2:8-8:2 to obtain spinning original liquid, then spinning and shaping the original liquid via general wet method, and treating solidifying bath via acid sodium sulfate saturated water solution, and the primary fiber is drawn, shaped via wet and heat method, washed, coiled, oiled, dried, and heated in dry condition to obtain the final melamine formaldehyde resin/polyvinyl alcohol flameproof fiber. The titer of said flameproof fiber is 10detex, while the strength is 1-3cN/dtex, the crack extended rate is 5-15%, the regain ratio is 5-10%, and the limit oxygen index is 30-45.

The invention discloses a spherical nitrogen-doped carbon-supported non-noble metal oxygen reduction catalyst and a preparation method thereof, and aims to provide a nitrogen-doped non-noble metal oxygen reduction catalyst which has the advantages of simplicity, convenience, practicability, low cost and stable performance and a preparation method thereof. The technical key points are as follows: the catalyst comprises the following components: melamine formaldehyde resin prepolymer, non-noble metal salt and acid. The preparation method of the catalyst comprises the following steps of: (1) uniformly mixing the melamine formaldehyde resin prepolymer with pure water; (2) adding the non-noble metal salt and stirring; (3) adding the acid into the solution obtained by the step (2), curing and drying to obtain blocks; and (4) performing thermal treatment to obtain the spherical nitrogen-doped carbon-supported non-noble metal oxygen reduction catalyst. The invention belongs to the technical field of fuel cell material science.

A gypsum-based mortar for plastering is prepared from semi-hydrated gypsum, quartz sand, Ca(OH)2, powdered coal ash, slag, lime stone, hoolamite, volcanic dregs, haydite, polystyrene foam, expanded pearlite, zeolite, and ethene-vinyl acetate copolymer resin. Agypsum-based mortar for automatic leveling is prepared from semi- hydrated gypsum, quartz sand, Ca(OH)2, powdered coal ash, slag, lime stone, ethene-vinyl acetate copolymer resin, methyl hydroxyethyl (or hydroxypropyl) cellulose ether, sulfonated cyanuramide-formaldehyde resin and gluconate.

The invention relates to a method for synthesizing a methylated melamine formaldehyde resin cross-linking agent with low free formaldehyde content. The technical scheme comprises the following steps of: putting melamine, formaldehyde and methanol into a reactor kettle, adjusting pH value to between 7 and 10 by using alkali, slowly raising the temperature, controlling the reaction temperature to be between 70 and 90 DEG C and preserving the heat for 1 to 2 hours; cooling reaction liquid, adding acid to adjust the pH value to between 3 and 6, etherifying the reaction liquid, controlling the reaction temperature to be between 50 and 70 DEG C and performing a reaction for 1 to 2 hours; lowering the temperature, adding an alkali terminator to adjust the pH value to between 8 and 10 to obtain mixed liquor A; and adding a formaldehyde catcher into the mixed liquor A, stirring and dissolving the mixture, dewatering in vacuum and removing methanol and formaldehyde to prepare a crude methylated melamine formaldehyde resin cross-linking agent product with low free formaldehyde content. The cross-linking agent has a long shelf life and low free formaldehyde content.

The invention relates to the technical field of self-repairing anticorrosive paints and particularly relates to a self-repairing microcapsule used for a metal anticorrosive paint and a preparation method of the self-repairing microcapsule. The self-repairing microcapsule sequentially comprises a capsule core material and double layers of wall materials from inside to outside, a corrosion-inhibiting material is loaded between the double layers of wall materials, a coupling reagent is adhered on an outer wall of the double layers of wall materials, wherein the capsule core material is a reactant of a polyhydroxyl or multiamino compound and isocyanate, an inner wall of the double layers of wall materials is polyurethane, the outer wall of the double layers of wall materials is melamine formaldehyde resin, and the corrosion-inhibiting material is a nanoparticle and a metal corrosion inhibitor. The microcapsule is high in repairing efficiency, stable in mechanical property and simple in process, is matched with a matrix, has extensive applications, and can be widely applied to the fields of metal anti-corrosion and self-repairing materials like the petrochemical engineering, the marine industry and the automobile industry.

The invention belongs to the technical field of materials, and specifically relates to a preparation method of melamine/formaldehyde resin cladded melamine phosphatic microcapsules for a fire retardant. The preparation method comprises the following concrete steps of: firstly adding 100g of MP and 0.1-3g of a dispersant into a solvent of 200-500ml, dispersing by stirring for 0.4-0.6 hours, adding a melamine/formaldehyde resin prepolymer into the system, dispersing by incessant stirring for 0.4-0.6 hours, heating up to 60-120 DEG C, reacting for 1-5 hours, filtering and drying to obtain a melamine/formaldehyde resin cladded MP microcapsule powder. The microcapsule coating is compact and uniform with good fluidity and greatly reduced water-solubility, can be used as a fire retardant for high-molecular materials such as polyolefin and nylon, and can be used in the flame retardation for materials such as timber, fabric, paintings and the like.

The present application proposes a specific tracer delivery system that has been tested. The claimed system is composed of melamine formaldehyde resin (MFR) doped with various tracer materials. The MFR is used to slowly release tracer compounds into a liquid system. The MFR/tracer mixture is applied as part of a monitoring system where tracer is delivered from the MFR/tracer mixture at a specific location up-stream and detected at some location downstream, thereby verifying fluid flow from that specific location up-stream. The MFR can be doped with different types of tracers, thereby allowing placement of different tracers at several different positions upstream. Production from the various labelled zones can be verified through the analysis of one sample downstream.

The invention provides a two-component urethane resin adhesive for a polymer lithium ion battery flexible package film, and aims to provide an adhesive which has the advantages of high bonding strength, stripping resistance, excellent barrier property, impact resistance, high bonding compatibility with a nonmetallic film or an aluminum foil, resistance to swelling, dissolving, permeation and absorption of electrolyte organic solvents and high-volatility substances, resistance to strong acid and strong alkali and difficulty in breaking a molecular chain after becoming dry and hard. The two-component urethane resin adhesive consists of components, wherein a first component (A) is an emulsion waterborne Poly Urethane (PU) performed polymer which is obtained by compounding polyester and isocyanate/benzene ring-containing polyether in the mass ratio 75/25-55/45 and adding an aid for reacting; a second component (B) is a composition consisting of glycidyl ether epoxy resin with the epoxy resin 0.25-0.45 and a melamine-formaldehyde resin additional crosslinking agent; the weight ratio of the first component to the second component is 10/1-10/2; and a certain amount of additional crosslinking agent is added into a PU emulsion in a certain mass ratio.

The invention relates to a method for modifying melamine foam, which comprises the following steps of: adding an emulsifier, a foaming agent, a curing agent and other aids into a base material, namely melamine formaldehyde resin synthesized by melamine and formaldehyde in a low molar ratio, adding melamine and one or more hydramine compounds, and uniformly emulsifying; heating and foaming at certain temperature for a certain period of time through microwaves in a microwave oven; and curing at high temperature, and processing and forming. In the process of foaming through the microwaves, the melamine or the melamine formaldehyde resin and the hydramine compounds can generate a compound capable of improving the performance of foam at high temperature under the action of the microwaves, and the foam is modified at the same time, so that the aim of improving the performance of the melamine foam is fulfilled.

Adhesive and sealant systems Adhesive and sealant systems on the basis of unsaturated polyester resins, epoxy resins, polyurethane, silane-terminated polymers, vinyl ester resins, acrylates, polyvinyl acetate, polyvinyl alcohol, polyvinyl ethers, ethylene-vinyl acetate, ethylene-acrylic acid copolymers, polyvinyl acetates, polystyrene, polyvinyl chloride, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, butyl rubber, polysulphide, polyethylene, polypropylene, fluorinated hydrocarbons, polyamides, saturated polyesters and copolyesters, phenol-formaldehyde resins, cresol-/resorcinol-formaldehyde resins, urea-formaldehyde resins, melamine-formaldehyde resins, polyimides, polybenzimidazoles or polysulphones and containing 1% to 15% by weight of a hydrophilic fumed silica structurally modified by grinding.

The invention relates to a method for manufacturing surface wear-resisting impregnated paper of a laminate floor by dry-spraying Al2O3. The method comprises the following steps: impregnating pure wood pulp roll paper with a melamine-formaldehyde (MF) resin liquid; uniformly spraying the Al2O3 on the surface of the impregnated paper by utilizing a dry sprayer; allowing the impregnated and sprayed paper to enter a first oven for drying at the temperature of 100-150 DEG C; roll-coating 300-500% (relative to the weight of the paper) of the MF resin liquid on the paper surface after preliminary drying; and allowing the roll-coated paper to enter a second oven for drying at the temperature of 100-150 DEG C, controlling the whole-course running speed of the paper at 10-12m/minute, cooling, adjusting the temperature of the oven and machine speed so as to reach 6.0-7.5% of volatile matters and 40-60% of pre-curing degree, cutting and packaging. By means of the method, the defects of the prior art are overcome, and the spray quantity of the Al2O3 can be adjusted by controlling the dry sprayer so as to obtain the surface wear-resisting impregnated paper with reliable quality according to different wear-resisting requirements; and the method has the advantages of reasonable process and obvious effect, and is simple in operation, thus effectively improving the product quality.

The invention discloses high-glowing filament anti-soaking separate-out-free halogen-free inflaming retarding polypropylene materials which comprise the following components: by weight, 40-80 parts of polypropylene (PP) resins, 20-40 parts of compound halogen-free flame retarding agents, 0.5-5 parts of flame retardant synergists, 0-30 parts of inorganic fillers, 0.1-0.5 part of antioxidants, and 0.4-1 part of lubricating agents. The compound halogen-free flame retarding agents are composed of the following components: by weight, 30-50 parts of silane-wrapped organic or inorganic hypophosphite, 35-50 parts of melamine formaldehyde resin (MF)-wrapped halogen-free organic phosphate ester or the ramification thereof, and 15-40 parts of melamine cyanuric acid ester. The compound halogen-free flame retarding agents are easy to disperse in the process of processing, so that processing is convenient. The halogen-free inflaming retarding polypropylene materials prepared by the method have high-glow filaments, and have the advantages of being anti-soaking, separate-out-free and the like. In addition, the production process is simple, so that industrial production can be achieved.

Disclosed is a fire-retardant, non-corrosive, water-resistant, insect-resistant, fungus-resistant composition comprising a first flame-retardant agent, water-resistant composition, a preservative composition, a second flame-retardant agent, a third flame-retardant agent, and a liquid melamine formaldehyde resin adhesive. The composition is to be used for topical application to articles using a spray device, where a layer of a desired thickness is applied.

The invention relates to a precoated sand for a casting field, in particular to a 3D printing precoated sand. The 3D printing precoated sand comprises the following components: 5-8 wt% of cashew nut shells, 1-2 wt% of melamino-formaldehyde resins, 1-5 wt% of cashew nut shell liquid modified phenolic resins, 0.6-0.8 wt% of urotropin, 0.1-0.4 wt% of lubricant, 0.1-0.8 wt% of binding agents, 0.1-0.4 wt% of coupling agents, 0.5-1 wt% of dispersing agents, and the balance of crude sands. The prepared 3D printing precoated sand has high strength, high-temperature resistance, low gas generating amount and low expansion rate.

Anhydrous antiperspirant compositions containing an encapsulated fragrance, in which the encapsulate shell comprises an aminoplast resin, and preferably a melamine/formaldehyde resin. The encapsulates have a weight average particle diameter in the range of 25 to 60 μm, a shell having a measured thickness in the range of from 1 to 10 μm and an average in the range of from 5 to 8 μm, a ratio of the shell thickness to the average particle diameter in the range of from 1:5 to 1:10 and a Hysitron hardness in the range of from 2 MPa to 50 MPa, particularly 15 to 25 MPa, enabling them do be advantageously employed in the anhydrous antiperspirant compositions.