1390 results about "Dodecylsulfonic acid" patented technology

Water soluble nonionic friction reducers and added to coacervate gels having excellent shear viscosities and other properties. A preferred gel comprises poly diallyl dimethyl ammonium chloride, a lesser amount of sodium lauryl sulfonate, and lauryl alcohol. Excellent friction reducing properties are manifested; a particularly practical use for the compositions is in subterranean formation fracturing.

The invention relates to a preparation method and an application of a selenium-enriched foliar fertilizer. The preparation method comprises the steps as follows: the selenium-enriched foliar fertilizer is prepared by sodium selenate, sodium selenite, fulvic acid, urea, compound sodium nitrophenolate, SDS (sodium dodecyl sulfate) and the balance water; and the sodium selenate and the sodium selenite are taken as donors of selenium, the fulvic acid is taken as a chelating agent, the compound sodium nitrophenolate is taken as a plant growth regulator, and the fertilizer is compounded by adding the plant growth regulator compound sodium nitrophenolate and the urea and the SDS. The selenium-enriched foliar fertilizer is mainly used for crops such as wheat, corn, tomatoes, muskmelons, sugar beet, red dates, walnuts, apples, bergamot pears and the like, and can provide the selenium element for the crops and improve the selenium contents in the crops. The selenium contents of the crops are improved by 128.6-275.0% while compared with those of crops without using the selenium-enriched foliar fertilizer.

The present invention relates to a water epoxy adhesive dry film lubricant with low-volatile organic compound. Its formula is composed of (by weight portion) 100 portions of epoxy resin, 20-50 portions of solidifying agent, 30-80 portions of one of teflon, molybdenum disulfide and graphite or several kinds of them, 10-40 portions of one of chrome oxide, copper oxide or aluminium oxide, 2-10 portions of attapulgite, 0-30 portions of melamine urea complex, 2-5 portions of sodium dodecanesulfonate, 1-4 portions of sodium nitrate and 100-400 portions of diluting agent (water or water/ethyl alcohol). As compared with existent technology said lubricant can be solidified, and has the characteristics of low pollution and long life, etc. can be used as lubricant wear-resistant coating layer of various slide frictioning components

The invention belongs to the technical field of conducting adhesive preparation and particularly relates to a preparation method of a graphene filling isotropic high-performance conducting adhesive. Graphene prepared in a ball-milling mode is adopted as a conducting filler, surface active agents including sodium dodecyl sulfate or silane coupling agent KH550 and the like are adopted to process the graphene to enable the dispersion degree of the graphene in the conducting adhesive to be increased, and the prepared high-performance conducting adhesive can be widely applied to the electronic packaging industry and has extremely remarkable effects.

A highly efficient inactivating detergent for ferrous sulfide is disclosed, which is characterized by that it comprises 0.1-10% of chlorine dioxide, 0.1-10% of surfactant, 0.1-5% of citric acid, 0.1-5% of EDTA, 0.1-5% of corrosion inhibitor and water. The surfactant is one or more from dodecyl sulphonate, dodecyl benzene sulfonate, condensate of alkyl phenol and epoxyethane and condensate of aliphatic alcohol and epoxyethane. The corrosion inhibitor is urotropine, dibutyl thiourea or alkyl pyridine. Using the inventive inactivating detergent in cleaning petroleum refining apparatus, ferrous can be thoroughly oxygenized, inactivated and sulfated on one aspect, to prevent occurrence of self-ignition accident, oil crust can be totally washed from the apparatus on the other aspect, which makes the invention has characteristics of high efficiency, secure and environmental protective.

The invention discloses a corrosive agent for displaying 9% Cr steel original austenite grain boundary and an application thereof. The corrosive agent is prepared by fully mixing the following components of: 60-80ml of H2O, 4-8ml of 36 wt% HCl, 2-4g of FeCl3, 0.2-0.5g of picric acid, and 1.0-2.0g of sodium dodecanesulphonate. The corrosive agent provided by the invention can be used as a reagent for 9% Cr steel grain boundary to clearly display the original austenite grain boundary of large crystal grain, large and small mixed crystal grain and small crystal grain of a sample. Under 100 times, it is easy to carry out grain size rating and the effect is good.

The invention relates to a water soluble compound potassium monopersulfate powdered disinfecting agent comprising sodium chloride, potassium monopersulfate, sulfamic acid, malic acid, lemon acid, sodium hexametaphosphate, sodium dodecanesulphonate and sodium silicate by weight percentage.

The invention relates to a high-temperature foam scrubbing agent for drainage gas recovery. The agent comprises the following components in parts by weight: 10-15 parts of sodium lauryl sulfate, 2-5 parts of alkyl glucoside, 15-18 parts of AES ( Alcohol Ether Sulphate), 20-25 parts of sodium lauryl sulfonate, 5-10 parts of biosurfactant and 27-48 parts of water. The high-temperature foam scrubbing agent has very high thermal stability and high foamability.

The invention discloses a berberine electrostatic composite and a preparation method of the berberine electrostatic composite, which are applied to medical and health industries. The berberine electrostatic composite is prepared from anionic surfactant and berberine or berberine salt by compositing; the molar ratio of the anionic surfactant to the berberine or berberine salt is 1 to 0.5-10; the molar ratio of anion to the berberine salt is 1 to 1; the anionic surfactant is one or more of alkyl sulfate or alkyl sulfonate or fatty acid salt; the alkyl sulfate is one or more of sodium cholesteryl sulfate, lauryl sodium sulfate and deoxysodium cholate; the alkyl sulfonate is one or more of sodium heptanesulfonate and sodium dodecyl sulfate; the fatty acid salt is one or more of sodium caprate and sodium enanthate, and the berberine and berberine salt are obtained by chemical synthesis or by extracting traditional Chinese medicine. The berberine is prepared into the berberine electrostatic composite to increase the biological membrane penetrating ability of the berberine and improve the oral bioavailability of the berberine, and the berberine electrostatic composite plays a significant treatment role on important chronic metabolic disorder diseases such as diabetes mellitus, complication of the diabetes mellitus, hyperlipidemia and the like.

The invention relates to a synthesis method of hydroxamate. The hydroxamate is synthesized from fatty acid, short chain alcohol, dodecyl sulfonic acid, hydroxylamine hydrochloride and caustic alkali by two steps; and the synthesis method comprises the following steps of adding fatty acid, short chain alcohol and dodecyl sulfonic acid into a reactor, stirring and reacting at a constant temperature of 75 DEG C-100 DEG C; carrying out reduced pressure distillation on the reactants to obtain fatty acid ester; adding hydroxylamine hydrochloride into another reactor, adding caustic alkali in batches while stirring, and mixing; adding fatty acid ester and reacting for 3-5 hours at 40 DEG C-60 DEG C to obtain a hydroxamate solution; and rapidly cooling the hydroxamate solution to obtain the solid hydroxamate. By the synthesis method, the conversion between acid-alkali environment for the esterification and hydroximation two-step reaction is avoided, the synthesized product needs not to be subjected to processing steps such as acidification, impurity removal and purification and the obtained product can be organically combined with flotation industry. The synthesis method has the advantages that the operation is simple, the yield of the product is high, the generation of a large amount of acidic wastewater is avoided and the cost of chemical agents is effectively decreased.

The invention provides a heavy metal cadmium, lead and arsenic compound contaminated soil restorative agent. The heavy metal cadmium, lead and arsenic compound contaminated soil restorative agent is prepared from the following components in percentage by weight: 30-50 percent of biomass charcoal, 5-10 percent of diatomite, 5-10 percent of sodium bentonite, 5-10 percent of activated aluminum oxide, 10-20 percent of dithiocar-bamate, 5-10 percent of ethylenediaminetetraacetic acid, 5-10 percent of tartaric acid, 5-10 percent of polyacrylamide and 5-10 percent of sodium dodecyl sulfate. A preparation method for the heavy metal cadmium, lead and arsenic compound contaminated soil restorative agent comprises the following steps: mixing the biomass charcoal, diatomite, sodium bentonite, activated aluminum oxide, ethylenediaminetetraacetic acid, tartaric acid, polyacrylamide and sodium dodecyl sulfate in mass proportion to obtain a mixture; and adding the dithiocar-bamate into the mixture in corresponding mass proportion to sufficiently mix uniformly, thereby obtaining the prepared soil restorative agent. The prepared soil restorative agent has good effect in restoring the cadmium, lead and arsenic compound contaminated soil.

The invention relates to a nanometer carboxylated polystyrene microsphere with a spacer arm and a preparation method thereof. A nanometer carboxylated polystyrene microsphere A is prepared by taking styrene and acrylic acid as a mixed monomer, taking water as a reaction medium, taking potassium persulfate as an initiator and taking sodium dodecyl sulfate as an emulsifier with an emulsion polymerization method. In the presence of EDC (Ethylidene Dichloride) serving as a coupling agent and Sulfo NHS, 4-aminobutyric acid, 6-amidocaproic acid or 8-aminocaprylic acid is connected to the surface of the microsphere, so that the nanometer carboxylated polystyrene microsphere with the spacer arm is prepared. The spacer arm is introduced into the surface of the nanometer microsphere, so that the steric hindrance of a coupling macromolecule is lowered, the activity and utilization ratio of the macromolecule are increased, and a nonspecific interaction between the macromolecule and the polystyrene microsphere is reduced. Meanwhile, the grain diameter of the microsphere can be adjusted by adjusting the using amount of the emulsifier, the length of the space arm and surface density, so that the nanometer microsphere has a wide application prospect in the fields of immune diagnosis, solid phase extraction and the like when serving as a carrier as well as a template.

A water-based metal cleaning agent and a preparing method thereof are disclosed. The cleaning agent includes, by weight, 15-20 parts of polyoxyethylene alkyl ether, 15-20 parts of octylphenol polyoxyethylene ether, 10-12 parts of sodium citrate, 10-12 parts of sodium stearate, 10-15 parts of sodium dodecyl sulfonate, 8-15 parts of triethanolamine oleate, 15-20 parts of coconut fatty acid diethanolamide, 3-5 parts of sodium silicate, 3-5 parts of carboxymethylcellulose, 2-4 parts of a defoamer and 80-100 parts of water. The polyoxyethylene alkyl ether, the octylphenol polyoxyethylene ether, thesodium dodecyl sulfonate are firstly dissolved into the water, then the sodium citrate, the sodium stearate, the sodium silicate, the triethanolamine oleate, the coconut fatty acid diethanolamide andthe carboxymethylcellulose are added in order according to the ratio, the mixture is stirred until the mixture is in a semitransparent state, finally the defoamer is added into the mixture, and the mixture is fully stirred. The cleaning agent is scientific and reasonable in formula, high in cleaning power, safe, environmentally friendly, simple and convenient to operate and low in cost.

The invention discloses a making method of sequent hydroxy phosphorite polycrystalline powder and calcium phosphate, which comprises the following steps: mixing 30% 0. 00167mol calcium nitrate per ml water and 15-60% 0. 0033-0. 0667g sodium dodecylbenzene sulfonate per ml alcohol; placing the mixed solution in the flask with reflux device; adding the composite solution with 30% ammonium monohydric phosphate at 0. 01mol phosphor/ml water solution and 15-60% alcohol and the composite solution with 20% sodium hydroxide solution at 0. 05-0. 1g sodium per ml water and 10-40% alcohol; heating to the refluxing temperature at 88-92 deg. c to do hydrothermal reaction at 4-14h; centrifuging; separating; drying the white sediment under 60-80 deg. c; obtaining the product with good crystallizing degree, high-sequent (spatial symmetry) nanometer layered polycrystalline structure; simplifying the method and reducing the cost.

The invention discloses a process for producing aqueous PU foam gloves, which comprises: impregnating knitted gloves in a resin, wherein the resin comprises 70 to 80 percent of PU resin and 20 to 30 percent of butadiene-acrylonitrile rubber, and based on the mixed volume of the PU resin and the butadiene-acrylonitrile rubber, also comprises 0.5 to2 percent of foaming agent, 0.5 to 2 percent of sodium dodecylsulphonate, 1 to 5 percent of potassium oleate, 1 to 5 percent of thickener and 5 to 20 percent of foam stabilizer, and the resin is foamed mechanically; before impregnating the knitted gloves with the resin, impregnating the knitted gloves with a coagulator to perform pulp spray and homogenate treatment; after impregnating the knitted gloves with the resin, impregnating the knitted gloves with a curing agent to perform pulp spray and homogenate treatment; drying the knitted gloves impregnated with the resin; and washing the knitted gloves impregnated with the resin with water by first soaking the knitted gloves in warm water for 1 to 30 minutes and then rinsing the knitted gloves with warm water for 1 to 30 minutes. The invention also discloses the aqueous PU foam gloves produced by the process for producing the aqueous PU foam gloves and a resin for use in the process for producing the aqueous PU foam gloves.

The invention discloses a wet type dust-laying agent composition and a use method thereof. According to the percentage by weight, 0.04-0.06% of sodium dodecyl sulfate, 0.04-0.06% of sodium dodecyl benzene sulfonate, 99.547-99.91% of water and 0.111-0.333% of calcium chloride are fully mixed; and the mixed liquid is pressed into a spraying dust-laying system of a working face in the coal mine for spraying. The sodium dodecyl sulfate and the sodium dodecyl benzene sulfonate are the substances with surface activities and the molecules of the two substances are formed by hydrophilic groups and hydrophobic groups. The hydrophobic groups are generally formed by longer carbon chains, have the characteristics close to the characteristics of the molecules on the surface of coal dust and are easierto carry out absorption than water molecules, thereby improving the dust seizing efficiency of water, ensuring the dust-laying rate of the dust-laying agent to exceed 90% and saving the water consumption for dust laying.

The invention discloses self-repairing concrete and a preparation method thereof. The self-repairing concrete comprises the following raw materials, in parts by weight: 200-300 parts of cement, 350-450 parts of sand, 800-1000 parts of gravel, 60-100 parts of water, 60-80 parts of sodium alginate, 35-55 parts of calcium chloride, 10-20 parts of sodium dodecyl sulfonate, 35-55 parts of hydroxymethyl cellulose, 40-60 parts of anti-cracking fibers, 10-20 parts of a silane coupling agent, 5-10 parts of a water reducing agent, 15-30 parts of calcium oxide and 20-30 parts of repair capsules; and the preparation method comprises the following steps: mixing the cement, the sand, the gravel, the sodium alginate and the hydroxymethyl cellulose under stirring, adding the sodium dodecyl sulfonate, the anti-cracking fibers and the silane coupling agent, performing mixing under stirring for 10-20 min, adding the water reducing agent and the water, performing stirring for 40-50 min, adding the calcium chloride and the calcium oxide, performing stirring for 20-30 min, finally adding the repair capsules, and performing stirring to obtain the self-repairing concrete. The self-repairing concrete provided by the invention has the advantages that the raw materials for preparing the concrete are easy to obtain, the construction is convenient, cracks of the concrete can be subjected to self repairing and the strength is higher after the cracks are repaired.

The invention discloses a photonic crystal microsphere as well as a preparation method and an application thereof. The photonic crystal microsphere comprises a photonic crystal inner core and a polymer outer shell, wherein the inner core is a suspension of polystyrene-poly(N-isopropyl acrylamide)polymer nanoparticles, the average particle diameter of the nanoparticles is between 110nm and 190nm; and the outer shell is hydrophobic photoinitiator resin of which the thickness is between 30mu m and 50 mu m. The preparation method comprises the following steps: (1) evenly mixing styrene, N-isopropyl acrylamide and sodium dodecyl sulfate with an initiator and carrying out emulsion polymerization reaction to obtain the suspension; (2) forming monodispersed emulsion droplets with core-shell structures under the action of the shearing force of an aqueous solution of a continuous phase by virtue of a microfluidic control technique, wherein the suspension is adopted as an internal phase, the resin monomer and an initiator system are adopted as intermediate phases; and (3) polymerizing and curing the resin monomer by virtue of UV irradiation. The photonic crystal microsphere is applied in bio-molecule detection and coding and has the advantages of good stability, bright color and high recognition.

The invention relates to a chemical washing method of reverse osmosis, which belongs to industrial wastewater processing technologies. The method which comprises four links of pickling, coarse alkali washing, fine alkali washing, and sterilization washing is characterized in that: a pickling washing agent added in the pickling link is citric acid with the weight of 120kg; an alkali washing agent added in the coarse alkali washing link is a mixture containing 60kg of sodium hydroxide and 6kg of sodium dodecanesulphonate, or a mixture containing 60kg of disodium ethylenediaminetetraacetate and 6kg of sodium dodecanesulphonate; and an alkali washing agent added in the fine alkali washing link is a mixture containing 50kg of MCT511, 30kg of disodium ethylenediaminetetraacetate, and 6kg of sodium dodecanesulphonate. The method of the present invention which allows organic pollutants and biomembrane scale deposits to be effectively washed has the advantages of system operation cost reduction, reverse osmosis membrane replacing frequency reduction, and resource saving.

The invention discloses a potassium monopersulfate composite salt disinfection powder, comprising 30 to 60 parts of potassium monopersulfate composite salt, 5 to 25 parts of sulfamic acid, 5 to 20 parts of sodium hexametaphosphorate, 1 to 10 parts of sodium chloride, 1 to 10 parts of sodium citrate and 1 to 5 parts of sodium dodecanesulphonate. The potassium monopersulfate composite salt disinfection powder releases free sulfate radicals and free hydroxyl radicals with high energy and high activity in water, so genetic toxicity of the disinfection powder after disinfection of raw water is far less than genetic toxicity of traditional chlorine disinfection; and effective constituents can act for a long time, so sufficient residual effective constituents in a pipe network can be guaranteed and continuous disinfection effect can be exerted.

The invention relates to the field of nanometer materials, and particularly relates to nano-silver-containing adhesive and a using method of the adhesive in technical wood. The nano-silver-containing adhesive is characterized in that nano-silver is uniformly applied to an environmentally friendly glue solution, and flour is used as an additive of glue. A preparation method of the nano-silver comprises the following steps: adding a sodium dodecyl sulfate solution and a hydrazine hydrate solution to a silver nitrate solution so as to obtain mixed liquid, and adding crown ether and an alkali metal-containing reducing agent to the mixed liquid, wherein the molar ratio of the crown ether to the silver nitrate is (1-2): 1, the molar ratio of the alkali metal-containing reducing agent to the silver nitrate is (0.5-1): 1; and controlling a pH value to 8-9, thus obtaining the nano-silver. The using method of the adhesive comprises the following steps: bonding decorative veneer and a base material through the nano-silver-containing adhesive, then feeding into a vacuum tank, and vacuumizing; then carrying out pressurizing treatment; carrying out microwave treatment; and finally taking out, and carrying out cold pressing and hot pressing. The nano-silver-containing adhesive provided by the invention has good stability, dispersity and adhesiveness.

The invention discloses a method for preparing composite material of stannic oxide/polyaniline. The method comprises the steps of taking stannic chloride as material and ethylene glycol as solvent, preparing nano stannic oxide powder material of which the mean grain size is about 1.5nm by a sol-gel process; taking aniline and prepared nano stannic oxide as materials, using sodium dodecyl sulfate,n-butyl alcohol and ammonium persulfate, and preparing the composite material of stannic oxide/polyaniline by adopting a microemulsion in-situ polymerization method. The method disclosed by the invention is easy to obtain the material, simple in synthesis and low in cost; the conductive polymer polyaniline in the prepared composite material not only can improve the conductive property of stannic oxide, but also can restrain agglomeration of nano stannic oxide at a certain extent. In addition, the existence of a conductive polymer network structure can effectively ensure electric contact between stannic oxide particles when electrode reacts, so that the composite material is expected to be excellent lithium ion battery negative electrode material.

The invention belongs to an inorganic mesoporous material area, in particular to a preparation method of a controllable silica hollow sphere material in a certain diameter range. The anionic surfactant sodium dodecyl sulfonate (SDS) controls the synthesis of spherical wall, which is provided with mesoporous channels and narrow distribution of diameter. The invention uses block copolymer and sodium dodecyl sulfonate as mixing template; with the addition of silicon source, the sol is formed after mixing; under the acid condition, through the agitating and aging treatment, after hydrothermal process, filtering and drying, the template is calcined to obtain silica hollow sphere with the mesoporous channel. Through changing the content of SDS, the synthesis of different size of silica hollow spheres with the mesoporous channel can be controlled. The invention has a simple process and a low cost; the mesoporous shell thickness and the pore diameter of the prepared silica hollow sphere with the mesoporous channel can be controlled in a large range; the invention is beneficial to the internal and external transmission of guest molecules; the invention also improves the reserves of guest molecules, which realizes the controlled release effectively.

The invention discloses liquid laundry detergent. The liquid laundry detergent comprises the following components in percentage by weight: 85 to 95% of soap base, 1.5 to 2.5% of sodium dodecyl sulfate, 0.5 to 1.5% of cocoanut fatty acid diethanolamide, 0.01 to 0.5% of essence, 0.01 to 0.5% of pigment, and the balance of water. A preparation method of the liquid laundry detergent comprises the following steps of: a, mixing the components of the liquid laundry detergent in proportion; b, stirring and heating to 80 to 85 DEG C; and c, cooling to obtain a finished product of the liquid laundry detergent. According to the liquid laundry detergent and preparation method provided by the invention, the prepared liquid laundry detergent has the characteristics of high detergency and mild performance.

The invention discloses a water-based working liquid for electrical discharge wire cutting, which comprises the following components by weight percent: triethanolamine, boric acid, oleic acid, polyethyleneglycol PEG-600, petroleum sodium sulfonate, petroleum barium sulfonate, sodium dodecyl sulfate, nonylphenol ethoxylate OP-10, fatty alcohol-polyoxyethylene ether MOA-15, Span S-80, detergent 6501, sodium alcohol ether sulphate AES, hydrolytic polymaleic anhydride HPMA, 1-hydroxy ethylidene-1,1-diphosphonic acid HEDP, glycerol, ethanol, sodium benzoate and water. The invention further relates to a preparation method of the water-based working liquid for electrical discharge wire cutting. The water-based working liquid with the pH ranging from 7.5 to 8.0 is yellowish and transparent, free from toxicity and irritating odor, and easy for biodegradation, and BOD (Biochemical Oxygen Demand), COD (Chemical Oxygen Demand) and other indexes in discharged sewage are in compliancy with the emission standards for environmental protection. The water-based working liquid disclosed by the invention can ensure the bright processed surface of workpiece even when being used in hard water regions.

The invention relates to a highly stable aqueous chain alkyl silane emulsion and a preparation method. The emulsion includes continuous aqueous phase, dispersed hydrolyzable alkoxy silane oil phase and emulsifier; the weight ratio of hydrolyzable alkoxy silane, emulsifier and water is 10 to 65:2 to 15:20 to 88. The hydrolyzable alkoxy silane oil phase is composed of chain alkyl trialkoxysilane R¹Si (OR²) ₃, trialkoxysilane R³Si (OR²) ₃ or dialkoxysilane R⁴R⁵Si (OR²) ₂ and the corresponding hydrolysis polycondensation oligomer, wherein, substituents R¹ and R⁴ are C_{1 to 18} chain alkyls, R² is methyl, ethyl, propyl, etc., and R³ and R⁵ are acryloyl oxy propyl, ethenyl, amino propyl, Gamma-glycidyl ether oxyl, etc. The emulsifier is nonionic and ionic complex, including OP series, Span series, Tween series and a composite system composed of sodium dodecyl sulfonate, sodium dodecyl sulfate and dodecyl benzene sulfonate.

The invention discloses a crack-resistant waterborne coating which comprises the following raw materials in parts by weight: 60-80 parts of a modified polyurethane emulsion, 20-30 parts of an acrylic emulsion, 15-25 parts of a pigment, 10-20 parts of a filler, 3-5 parts of 2,2,4-trimethyl-1,3-pentanediolmono(2-methylpropanoate), 4-5 parts of sodium dodecyl sulfate, 0.2-0.4 part of a flatting agent, 0.1-0.2 part of an emulsifying agent OP-10, 0.1-0.2 part of a de-foaming agent, 0.2-0.4 part of a wetting agent 265, 0.2-0.4 part of sodium carboxymethyl cellulose, 0.6-0.8 part of gamma-(2,3-epoxypropoxy) mercaptopropyltrimethoxysilane, 0.2-0.4 part of a mildew preventive and 10-18 parts of water. The crack-resistant waterborne coating disclosed by the invention has good toughness, impact performance, crack resistance and bonding performance.

The present invention relates to a molecular imprinting resin, its preparation and application for separation and purification of protein. Its aperture is 2-3 micrometers, and it is prepared by using acrylamide as monomer, using grafts of low molecular weight polyethanol as auxiliary identification chain, using bovine serum albumin as template, using N,N-methylenebisacrylamide as cross-linking agent, using acrylic ester macroporous resin spheres as carrier in phosphate baffer system and using ammonium peroxydisulfate-sodium sulfite oxidation reduction system as initiator through cross-linking polymerization for 4-6 h. at 4-10 deg.C.

This invention discloses a method for manufacturing a urea-formaldehyde resin additive, which is composed of active attapulgite clay, magnesium oxide, polyvinyl alcohol, polyacrylamide and sodium dodecyl sulfonate. The method comprises the steps of mixing the raw materials, pulverizing and packaging to obtain the final product. The urea-formaldehyde resin additive is a neutral additive containing active minerals and polymers, and once added into urea-formaldehyde resin it can improve the quality of urea-formaldehyde resin, reduce the release of formaldehyde and alleviate environmental pollution.

The invention discloses a work layer coating of a steel casting tundish, which comprises the following raw materials in weight parts by proportion: 64 parts of forsterite, 31.5 parts of sintered magnesite, 2.5 parts of silicon micro-powder, 1 part of paper fiber, 0.5 part of sodium tripolyphosphate, 0.3 part of canary dextrin, 0.2 part of white mud, 0.01 part of anti-explosion fiber, 0.0013 part of sodium dodecyl sulfate and 0.001 part of aluminum powder. The work layer coating of the steel casting tundish, obtained in the invention, has enhanced folding and compressive strength and good high-temperature usability, and when applied to the tundish, the invention can achieve the effects of good smearing property, no phenomena of back-falling, flowing, bubbling, no phenomena of bursting and peeling during roasting, good corrosion resistance to alkali covering agent, strong molten steel flushing resistance, no deterioration of wrapping wall, and no pollution to the molten steel, thereby effectively meeting the working requirements on the rtundish and prolonging the service life.