52 results about "Formaldehyde" patented technology

The invention relates to a magnesium calcium fire-proof plant fibre board and the preparation method thereof, and consists of 1 to 2.4 parts of abio-glue gelled material, 1.5 to 2.5 parts of plant fibres, 0.025 to 0.03 parts of cymene sodium silicate and 1.4 to 1.8 parts of stirring liquor. The invention adopting the method of heat pressing the half dry feed comprises the steps of preparation of material, stirring of the mixture feed, paving and pre-pressing, heat pressing and moulding and incising with fixed size. The products not contain formaldehyde and has the advantages of environmental protection, no poison, harm and crack, light weight and heat preservation, shrinking and small swelling modulus. The invention has good fire-proofing, water-proofing, antisepsis, moth-proofing, and weathering resistance, thereby thoroughly eliminating abuse reversing salting of the magnesium products. Moreover, the invention has the characteristic of the abio-material and combines the characteristics of wood including fine texture, strong natural tactile sensation, easily planning, cutting, fixing and sticking. The invention which has simple production technique and fast shaping speed needs not to be preserved and aired and has high intensity of breaking resisting and even density and not distort. The invention is applicable to the industries such as constructional material, package, transportation, decorating, etc.

The invention relates to a method for measuring formaldehyde in aqueous solution by utilizing electrochemical luminescence of terpyridyl ruthenium. The aqueous solution sample containing the formaldehyde is taken to be mixed with terpyridyl ruthenium solution with the pH value of 8.6 and the concentration of 1mmol/L, wherein, the concentration of the formaldehyde aqueous solution is 0.9-300mg/L; after that, cyclic voltammetry is carried out within the range of 0.2-1.5v, and the speed is 0.1v/s; a working electrode of electrochemical luminescence measurement is a glassy carbon electrode, and then linear relation exists within a certain range according to the electrochemical illumination intensity and the concentration of the formaldehyde; quantitative analysis is carried out on the formaldehyde in the aqueous solution. The method can be used for measuring the content of the formaldehyde within the concentration range of 0.9-300mg/L. The method for measuring formaldehyde by utilizing electrochemical luminescence has the advantages of simple operation, rapid measuring speed, lower price of an analytical instrument and the like, and can be expected to be used for daily analysis.

Th invention relates to a preparation method of an environment-friendly ecological board, and belongs to the technical field of decorative materials. The method comprises the following steps that 1, a hindered amine light stabilizer is dispersed into melamine modified resin, and then first-time dipping treatment, first-time drying, second-time dipping treatment and second-time drying are sequentially conducted on woodgrained paper in an obtained mixture to prepare a high color fastness facing layer, wherein a light stabilizer dispersion technology comprises the steps that 100 parts by mass of the melamine modified resin and 5-20 parts by mass of the light stabilizer are weighed, and the light stabilizer is added to the melamine modified resin during stirring; 2, veneer compounding is conducted on the high color fastness facing layer and a buffer balance layer for hot pressing; 3, the upper surface and the lower surface of a substrate layer are coated with an environment-friendly adhesive, and boards prepared in the second step are compounded on the upper surface and the lower surface, coated with the environment-friendly adhesive, of the substrate layer for prepressing; 4, the environment-friendly ecological board is prepared through hot pressing. The decorative board has the advantages of being low in formaldehyde emission amount and high in grade of color fastness grade to light.

The invention provides an elastic pure cotton woven fabric with smooth surface and soft handle and a preparation method thereof. The method includes the steps of: pretreatment; alkali mercerizing treatment: employing an alkali liquor with a concentration of 20-28 Baume degree to conduct treatment for 45s-60s; liquid ammonia mercerizing treatment; enzyme treatment: putting a fabric in a working solution containing cellulase, and flapping the fabric at the same time; softening treatment: using a ternary polymerization softening agent to perform softening treatment on the fabric; washing and setting treatment; and pre-shrinking treatment, thus obtaining a pure cotton woven fabric finished product. The pure cotton woven fabric obtained by the technical scheme provided by the invention not only has silky gloss, but also has obvious tightness and good resilience in itself, and the handfeel is soft and full. At the same time, the fabric does not contain formaldehyde, and is safe to human body.

The invention relates to preparation and application of nanometer multifunctional shell powder coating, and belongs to the field of building coating. The nanometer multifunctional shell powder coatingcomprises, by weight, 100 parts of modified shell powder, 15-25 parts of re-dispersible adhesive powder, 30-40 parts of raw shell powder, 1-5 parts of tourmaline powder, 1-2 parts of pigment and 0.1-0.5 part of defoaming agents. The preparation and the application have the advantages that the nanometer multifunctional shell powder coating has functions of adsorbing and decomposing TVOC (total volatile organic compounds) such as formaldehyde, ammonia gas and benzene, the indoor humidity further can be regulated under 'respiration' effects, accordingly, growth of bacteria can be inhibited, moldcan be prevented in a long-acting manner, and the nanometer multifunctional shell powder coating is beautiful in color, can be widely applied to indoor walls of classrooms, home, offices and the like, is environmentally friendly, is free of pollution, low in production cost and convenient to transport and store and has huge application potential.

A bifidobacteria colostrum-soluble soft capsule and a preparation method thereof. The invention relates to a bifidobacterium colon-soluble soft capsule and a preparation method thereof. The soft capsule includes two parts, a content and a rubber skin, and the shell of the soft capsule is processed to make it colon-soluble. The content of the soft capsule is a stable suspension prepared by mixing and stirring bifidobacterium freeze-dried powder, vegetable oil, suspending agent and wetting agent. In addition, the capsule shell has colonic solubility by impregnating the soft capsule with formaldehyde. The invention encapsulates the bifidobacterium freeze-dried powder soft capsule with vegetable oil as the carrier, has the effect of dissolving the colon, has good product stability, is convenient for transportation and storage, prolongs the shelf life, and jointly acts the bifidobacteria and vegetable oil on the colon , improve the disorder of intestinal flora, achieve the effect of laxative, and solve the pain caused by constipation. The invention is applied to the field of preparation of probiotics.

A modified dimethylnaphthalene formaldehyde resin is disclosed, which is excellent in heat resistance and useful for thermosetting resins which are used for an electrical insulating material, a resin for resist, a semiconductor sealing resin, an adhesive for printed wiring board, a matrix resin for electrical laminate or prepreg to be mounted in electrical instruments, electronic instruments, industrial instruments, etc., a buildup laminate material, a resin for fiber-reinforced plastic, a sealing resin for liquid crystal display panel, a paint, a variety of coating agents, an adhesive, a laminate for electrical or electronic parts, a molded article, a coating material, a sealing material and the like, the modified dimethylnaphthalene formaldehyde resin being obtained by modifying a polyfunctional dimethylnaphthalene formaldehyde resin having a constituent unit represented by the following general formula [1] in a molecule thereof with at least one member selected from the group consisting of a phenol represented by the following general formula [2], a naphthol represented by the following general formula [3] and a naphthol represented by the following general formula [4] (provided that at least any of the naphthol represented by the general formula [3] or the naphthol represented by the general formula [4] must be included).

The invention relates to a method for preparing methyl formate and coproducing dimethyl ether. The method comprises the steps: enabling raw materials, which contain formaldehyde and methanol, to enter a first reaction zone and be in contact with a catalyst A, carrying out separating so as to obtain a component I, enabling the component I to enter a second reaction zone and be in contact with a catalyst B, and then, carrying out separating so as to obtain methyl formate which serves as a product, dimethyl ether and a component II; taking at least 1% of the dimethyl ether as a product, and returning the rest dimethyl ether to the first reaction zone as circulating dimethyl ether; and returning the component II to the second reaction zone. In the raw materials, the ratio of the formaldehyde to the methanol (by mole numbers of carbon atoms contained by each ingredient) is 1: (0.05 to 4); the WHSV of the formaldehyde in the raw materials is 0.01/h to 15.0/h; the interior temperature of the first reaction zone is 50 DEG C to 100 DEG C; the interior temperature of the second reaction zone is 50 DEG C to 200 DEG C; the pressure is 0.1 to 10Mpa; and each ingredient is of a gas phase and/or a liquid phase independently. According to the method, the life of a catalyst is long, the reaction conditions are mild, the utilization ratio of the raw materials is high, and continuous production can be achieved, so that the method has large-scale industrialized application potential.

The invention relates to the technical field of construction and building materials, in particular to photocatalytic concrete prepared with a phosphogypsum-based hydraulic composite binding material and a preparation method of the photocatalytic concrete. The photocatalytic concrete is prepared from phosphogypsum, slag powder, limestone powder, portland cement, broken glass slag, wind-blown sands,a foamer, a foam stabilizer, a water reducer and a photocatalytic organic adhesive. The photocatalytic concrete provided by the invention can be used to improve the indoor air pollution problem, particularly perform adsorption and degradation on harmful gas including formaldehyde, the improvement can be finished under the condition of natural illumination without more energies and operation steps, and the photocatalytic concrete has market value. The photocatalytic concrete is suitable for the field of indoor decorative materials including light wall body materials, gypsum wall body articlesand ceiling decorative plates.

The invention relates to a method for establishing an animal model for senile dementia, a special liquid medicine and a dosing device, and belongs to the technical field of neurosciences. The method comprises the following steps: obtaining positioning coordinates of paraceles according to brain atlases or/and magnetic resonance image data of an experimental animal; respectively burying a conduit of the dosing device in left and right paraceles of the animal, and injecting the special liquid medicine to the paraceles at a constant speed in 14-16 minutes under a sterile environment within 2-3 weeks, wherein the liquid medicine amount is 100-250 ml methanol per day; alternately dosing the left and right paraceles, wherein the dosing frequency is 18-30 hours at an interval; and continuously dosing for 2-10 months to obtain a non-human primate animal model for senile dementia. With the adoption of a novel dosing mode: dosing to the paraceles at the constant speed, medicine can circulate to whole brain through the cerebrospinal fluid to exert the toxic effect, so that peripheral damage by the medicine is avoided. The AD model is established by injecting methanol or formaldehyde to the paraceles, so that behaviors and pathological symptoms are typical, the basic physiological status is good and the individual difference is relatively smaller.

The invention provides a biological comprehensive treatment method of indoor decoration pollution, and relates to the technical field of indoor decoration pollution and decoration material pollution treatment. The treatment method comprises: (1) using the surface pollution oxidation method in the chemical methods, and using the chemical reagent to oxidize the benzene series on the surface of the solid wood paint; (2) using the straying gun to spray on the surface of the material and the furniture; (3) adopting a biological method, wherein biological aldehyde clearing enzyme to clear indoor formaldehyde and other harmful gases. According to the present invention, the comprehensive treatment method is adopted, the application range is wide, no secondary pollution is generated, the used materials are the green environmental protection products, and the practicality is strong.

The invention discloses an anticorrosive coating material for reinforced concrete, a preparation method and applications thereof, and belongs to the technical field of anticorrosive coating materials,wherein the anticorrosive coating material comprises, by mass, 8-30% of a phenol formaldehyde epoxy resin, 4-20 % of Ethylene glycol diglycidyl ether, 4-20 % of butanol, 1-5 % of a xylene-type unsaturated polyester resin, 7-32 % of a modified amine epoxy resin curing agent, 0.8-4 % of toluene-2,6-diisocyanate and/or modified toluene-2,6-diisocyanate, 5-25 % of mica flakes, and 2-3 % of ultrafinesilica. According to the present invention, the anticorrosive coating material has advantages of good sulfate and chlorine ion barrier performance, low film thickness, low surface energy, strong climate adaptability, good mechanical property, simple coating and the like, can meet the use requirements of high-sulfate and high-chlorine-ion composite salty soil environments, and can ensure the safetyand the long-term stability of the reinforced concrete infrastructure in the high-sulfate and high-chlorine-ion composite salty soil environment.

The invention discloses novel rubber good in oil resistance. The novel rubber comprises 15-35 parts of chlorinated ethylene propylene rubber, 20-30 parts of butadiene-acrylonitrile rubber, 25-40 parts of fluoride rubber, 3-7 parts of zinc oxide, 5-10 parts of calcium borate, 3-8 parts of magnesium methacrylate, 10-15 parts of white carbon black, 20-40 parts of paraffin, 12-20 parts of bismaleimide resin, 15-28 parts of phenol-urea-formaldehyde copolycondensation resin, 2-7 parts of 2-(p-benzyl-chloride-sulfhydryl-thioxo) benzimidazole and 15-22 parts of anti-aging agent. The novel rubber is prepared through a process of plastication, mixing, vulcanization, drying, cooling and standing and the like. According to the prepared novel rubber, the use of a rubber material in the environment filled with oil is met, and original rubber performances are not affected. The oil resistance (the expansion rate after oil soaking) of the novel rubber is 6.5-8.5%, the heat-resistant coefficient (the coefficient of thermal aging) is 0.61-0.78, the air tightness is 2.5-2.8 m2/s.Pa, and the tear resistance is 58-63 kN.m.

The invention belongs to the technical field of eyelet fabrics, and particularly discloses a reinforcing eyelet fabric and a preparation method thereof. The reinforcing eyelet fabric comprises a filament weaving fabric and a glue layer, wherein the filament weaving fabric is formed by weaving nylon 6/66 chemical fibers, and the warp density and the weft density of the filament weaving fabric are respectively between 34-38 pieces/5 centimeters and 25-28 pieces/5 centimeters; the filament weaving fabric is coated with the glue layer which comprises resorcinol, formaldehyde, sodium hydroxide and butadiene-vinylpyridine copylymer latex. The reinforcing eyelet fabric disclosed by the invention can effectively overcome the defect that the reinforcing property of the reinforcing eyelet fabric is reduced due to high temperature melting when a wound high-pressure rubber hose is vulcanized, and a steel wire layer and an inner rubber hose layer which form the high-pressure rubber hose form a completed integer under the adhesive force of a glue coated layer, so that the pressure-resistant property of the high-pressure rubber hose is greatly improved.

The invention discloses a plant-origin reagent with a formaldehyde removing function and a preparation method thereof, and relates to the field of indoor waste gas treatment. The reagent comprises byweight, 5-15 parts of a plant-origin formaldehyde absorbing agent, 30-70 parts of a plant-origin formaldehyde reaction agent, 6-18 parts of a crosslinking agent and 20-35 parts of water, wherein the plant-origin formaldehyde reaction agent comprises Arbutin ethanol extracts, centella ethanol extracts, milk thistle ethanol extracts, fructus cnidii ethanol extracts, golden buckwheat rhizome ethanolextracts, grape ethanol extracts, tea leaf ethanol extracts and amino acid. The reagent has the advantages that the reagent is harmless to a human body and can effectively removing the formaldehyde.

The invention discloses environment-friendly abrasion-resistant and scratch-resistant paint for wooden doors. The environment-friendly abrasion-resistant and scratch-resistant paint comprises waterborne polyurethane, waterborne acrylic resin emulsion, defoaming agents, coalescing agents, wetting agents and leveling agents. The environment-friendly abrasion-resistant and scratch-resistant paint forthe wooden doors has the advantages that the environment-friendly abrasion-resistant and scratch-resistant paint does not contain harmful substances such as formaldehyde, benzene and heavy metal andaccordingly is environmentally friendly and safe; films are high in hardness, abrasion resistance, scraping resistance and scratch resistance and good in stability and adhesive force, and common paintfilm diseases such as bubble, particles and whitening can be prevented as compared with ordinary waterborne paint; the environment-friendly abrasion-resistant and scratch-resistant paint is excellentin moisture-resistant and corrosion-resistant performance, accordingly, the service life can be prolonged, and the wooden doors can be protected from being corroded or affected with damp to be damaged; the environment-friendly abrasion-resistant and scratch-resistant paint is in simple formulas and is low in manufacturing cost, wide in application range, easy to produce and convenient to popularize and use.

The invention discloses a synthesis method of tonkinensine B shown in formula (III). The synthesis method comprises the steps as follows: cytisine shown in formula (I), maackiain shown in formula (II), formaldehyde and 4-dimethylaminopyridine are mixed in an organic solvent, the obtained mixture reacts at 85-95 DEG C for 2-3 h, a reaction solution is subjected to posttreatment, and the product tonkinensine B shown in the formula (III) is obtained. The preparation process method is simple, takes short time and is high in yield. Experiment results show that the yield can reach 73% or above withthe adoption of the synthesis method.

An adhesive used for moisture-proof fiberboards is disclosed. The adhesive comprises following raw materials by weight: formaldehyde, urea, resorcinol, oxidized starch, flour, polyvinyl acetate, an acid solution and an alkali solution. Beneficial effects of the adhesive are that comprehensive modification is performed through adding a small amount of the oxidized starch, the polyvinyl acetate and the resorcinol, curing time of the adhesive in fiberboard hot pressing is shortened, adhesive strength is increased, obvious characteristics including enhanced waterproofness, high mechanical strength, good dimension stability, and the like of the fiberboards are achieved, and problems that fiberboards under high-moisture environments are liable to expand and deform and strength is poor, and the like are overcome.

The invention discloses a method for preparing DL-serine by a one-pot enzyme method. The method comprises the following steps: (1) taking formaldehyde and glycine as substrates, in the presence of coenzyme, catalytically converting one molecule of formaldehyde and one molecule of glycine into D-serine by a recombinant D-threonine aldolase; and (2) converting the D-serine to DL-serine under the action of recombinant alanine racemase. The invention has the advantages of simplicity in operation, short production period, low production cost, high yield, small emission of three wastes, suitabilityfor large-scale industrial production and the like.