39results about How to "Low acid and alkali resistance" patented technology

The invention relates to a composite ultrafiltration membrane of a modified chitosan composite electrostatic spinning nanofiber. The composite ultrafiltration membrane is structurally characterized in that a non-woven fabric supporting layer substrate is sequentially provided with a membrane layer which has excellent chemical resistance and ageing resistance, and is composed of polymer electrostatic spinning nanofiber and prepared by using an electrostatic spinning method; and the surface of the membrane layer is an ultrathin modified chitosan separation layer which has high water permeability and stable chemical property, and is formed after a high-hydrophilcity ultrathin chitosan layer coated on the surface of the membrane layer composed of the polymer electrostatic spinning nanofiber by using aldehyde and acyl chloride modifiers is subjected to crosslinking modification. The multi-layer composite ultrafiltration membrane provided by the invention has the characteristics of high water flux, high interception efficiency, low pollution, resistance to acid and base and the like. The filtration membrane can be used for producing domestic water, drinking water and water used under special conditions and is suitable for the fields such as medicines, bioengineering, foods, environment friendliness and the like.

The invention discloses a method for producing green ecological cement resistant to seawater corrosion by using construction wastes. The cement comprises the following raw materials in parts by weight: 40-50 parts of sulphoaluminate cement clinkers, 5-20 parts of construction wastes, 20-25 parts of steel slag powder, 0.06-0.08 part of compound activating agent, 2-5 parts of early strength agent, 0.3-0.5 part of water reducing agent, 0.005-0.007 part of air entraining agent and 0.3-0.5 part of retarder. The production method is characterized by breaking, grinding and homogenizing the construction wastes, the sulphoaluminate cement clinkers, the compound activating agent and the early strength agent respectively, preparing the materials in proportion, mixing the materials, homogenizing the mixture, then adding the water reducing agent, the air entraining agent and the retarder, mixing the materials and homogenizing the mixture, thus preparing the product. The green ecological cement resistant to seawater corrosion has the excellent characteristics of high strength, resistance to seawater corrosion and seawater scouring, and the like besides the properties of ordinary cement, and is especially suitable for underground engineering, ports, wharfs and other engineering suffering corrosion of erosion media.

The invention discloses a method for producing seawater corrosion-resistant green ecological cement from stone waste. The seawater corrosion-resistant green ecological cement comprises the following raw materials in parts by weight: 30-40 parts of stone waste, 40-50 parts of sulphate aluminum cement clinker, 0.03-0.05 part of a complex activator, 2-4 parts of an early-strength agent, 0.3-0.5 part of a water-reducing agent, 0.005-0.007 part of an air entraining agent, and 0.3-0.5 part of a retarder; and the production method comprises the following steps: respectively crushing the stone waste, sulphate aluminum cement clinker, complex activator and early-strength agent, grinding, homogenizing, then mixing and homogenizing according to a proportion, then adding the water-reducing agent, air entraining agent and the retarder, mixing and homogenizing to obtain the seawater corrosion-resistant green ecological cement. The seawater corrosion-resistant green ecological cement has the excellent properties of being high-strength, seawater corrosion-resistant, seawater scouring-resistant and the like besides the performances of common cement, and is especially applicable to underground engineering, ports, wharfs and other engineering corroded by erosion media.

The invention provides a water-based epoxy anticorrosive paint and a preparation method thereof. The water-based epoxy anticorrosive paint comprises a component A and a component B in a weight ratio of 1:(2-3), wherein the component A and component B are mixed only when in use. The component A comprises the following ingredients in percentage by mass: 30-40% of water-based epoxy resin emulsion, 18-25% of potassium silicate, 18-25% of lithium silicate, 1-3% of water-based wetting and dispersing agent and 15-25% of deionized water. The component B comprises the following ingredients in percentage by mass: 80-90% of zinc powder, 5-10% of corundum, 0-5% of filler and 5-10% of antirust pigment. By adopting the two-component system composed of the component A and component B, the component B is added into the component A, evenly stirred and filtered, and can be subjected to spray construction. The production technique and use operation are very simple and convenient, have the advantages of environment friendliness and energy saving, and are safe to use. The water-based epoxy anticorrosive paint can be widely used in various hardware materials, and has higher decorative performance.

The invention relates to the field of flue gas treatment, in particular to an integrated dust-fog removing device and a dust-fog removing method for a wet desulphurization system. According to the device, the principle of glass tube condensation, the principle of screen filtration and the characteristic of different porosities of polytetrafluoroethylene (PTFE) monofilament fibers are utilized to realize the simultaneous efficient purification of original micron-grade solid smoke dust fine particles with different particle sizes and micron-grade fogdrop particles with different particle sizes in flue gas of the wet desulfurization system. After the device is adopted, the micron-grade solid dust and the micron-grade fogdrops in the flue gas can be efficiently removed in an integrated way; furthermore, the device is compact in structure, is easily installed in the wet desulphurization system of the flue gas, and is simple and convenient to operate, thus having wide market prospect and higher promotional value. The device and the method which are provided by the invention are suitable for large-load and high-power wet flue gas desulphurization treatment systems of coal in a power plant, the coal chemical industry, and the like.

The invention discloses high-strength concrete. The high-strength concrete is prepared from, by weight, 10-12 parts of cement, 35-45 parts of sand, 60-75 parts of coarse aggregate, 13-17 parts of silicon powder, 7-12 parts of rubber powder, 3-5 parts of modified bamboo fibers, 1-4 parts of polyvinyl alcohol fibers and 3-7 parts of polypropylene fibers. By addition of a certain quantity of silicon powder into cement and sand, pressure resistance of the concrete is greatly improved; due to addition of the modified bamboo fibers, the polyvinyl alcohol fibers and the polypropylene fibers, cracking resistance of the concrete is improved while concrete strength is improved as well, and concrete density is reduced to some extent.

The invention discloses a production method of a composite fiber cement board, and belongs to the technical field of building materials. The production method comprises the following steps: mixing microcrystalline cellulose with a sodium hydroxide solution, cooling the obtained solution, adding a precooled urea solution, stirring and mixing the obtained solution, centrifuging the obtained solutionto obtain a microcrystalline cellulose solution, dropwise adding an etherifying agent to the microcrystalline cellulose solution, performing constant-temperature stirring and reacting, cooling the obtained solution, adding urease and a calcium nitrate solution, continuing a reaction, concentrating the obtained reaction solution, drying the concentrated reaction solution to obtain etherified microcrystalline cellulose, performing a constant-temperature and constant-pressure reaction on the etherified microcrystalline cellulose and a sodium methoxide solution, cooling the obtained reaction solution, adding chloromethane, performing a constant-temperature and constant-pressure reaction, carrying out reduced pressure concentrating, drying the obtained concentrate to obtain modified microcrystalline cellulose, mixing cement, the modified microcrystalline cellulose, a water reducer and a defoamer, carrying out injection molding, and curing the molded mixture to obtain the composite fiber cement board. The composite fiber cement board obtained in the invention has excellent mechanical properties.

The invention discloses a carboxyl-terminated fluorine-containing prepolymer modified epoxy coating and a preparation method and application thereof and belongs to the field of polymer coatings. The modified epoxy coating contains the following components in parts by weight: 0.1-30 parts by mass of a carboxyl-terminated fluorine-containing prepolymer, 100 parts by mass of epoxy resin, 80-100 parts by mass of a curing agent, 0.5-2.5 parts by mass of an accelerant and 0.5-1 part by mass of a leveling agent. The modified epoxy coating is prepared by compounding the carboxyl-terminated fluorine-containing polymer and epoxy (methyl) acrylate, has the advantages of low surface energy, good adhesion, high hardness, acid-alkali resistance and the like, and can be applied in coating of metal parts and coating of electric parts.

The invention discloses a silicon carbide-based composite circuit board and a preparation method thereof and belongs to the technical field of circuit boards. The silicon carbide-based composite circuit board comprises a silicon carbide-based composite base board and a circuit printed on the silicon carbide-based composite base board, wherein the silicon carbide-based composite circuit board is prepared from raw materials of, by weight part, 50-60 parts of silicon carbide, 20-28 parts of glass powder, 5-10 parts of filler, 3-7 parts of adhesives and 7-12 parts of additives. The silicon carbide-based composite circuit board is prepared by taking the silicon carbide and the glass powder as the main component and matching with the filler, the adhesives and the additives through ball milling,ultrasonic treatment, spray granulation and three sintering processes. Through dispersion and adhesion of the raw materials, the prepared silicon carbide-based composite base board can be low in thermal expansion coefficient, high in mechanical strength, good in stability and capable of effectively improving the qualification rate, thereby being high in promotional significance.

The invention belongs to the technical field of polymer coating, and discloses amine-terminated reactive fluorine-containing polymer modified waterborne epoxy coating, and preparation and applicationof the amine-terminated reactive fluorine-containing polymer modified waterborne epoxy coating. The amine-terminated reactive fluorine-containing polymer modified waterborne epoxy coating comprises, by weight, 100 parts of epoxy resin, 5-100 parts of modified epoxy resin with hydrophilic polyether, 0.1-40 parts of amine-terminated reactive fluorine-containing prepolymers, 8-100 parts of curing agents, 0.1-2.5 parts of accelerators, 0.1-1 part of leveling agents, 0.1-2.5 parts of defoaming agents, 0.1-2.5 parts of dispersing agents, 0-200 parts of fillers and 100-250 parts of water. The amine-terminated reactive fluorine-containing polymer modified waterborne epoxy coating, the preparation and the application have the advantages that films formed by the amine-terminated reactive fluorine-containing polymer modified waterborne epoxy coating are high in adhesion and hardness and good in acid and alkali resistance; components in the amine-terminated reactive fluorine-containing polymer modified waterborne epoxy coating are good in compatibility; the amine-terminated reactive fluorine-containing polymer modified waterborne epoxy coating can be used for coating metal components and electric components.

The invention discloses a cracking-resistant and waterproof concrete admixture. The cracking-resistant and waterproof concrete admixture comprises, by weight, 40-50 parts of marble powder, 10-20 partsof granite powder, 0.6-0.8 part of a composite activator, 4-6 parts of an early strength agent, 1-3 parts of a water reducing agent, 6-8 parts of an assistant, 1-3 parts of a set retarder, 3-5 partsof a flame retardant mixture and 12-14 parts of modified nanometer calcium carbonate. The cracking-resistant and waterproof concrete admixture has the advantages of low alkalinity, good acid and alkali resistance, early strength, fastness in hardening, continuous increase of the later strength, facilitation of the improvement of the safety and the durability of reinforced concrete, and suitableness for constructing ports, seawalls, coastal protection, cross-sea bridges, refueling-at-sea stations and other offshore engineering .

The invention discloses an antibacterial peptide LJ-2 and an application thereof. The amino acid sequence of the antibacterial peptide LJ-2 is as follows: the amino acid sequence of the antibacterialpeptide LJ-2 is shown in the specification: arginine, arginine, valine, leucine, arginine, isoleucine, leucine, lysine, histidine, histidine, glutamine, glycine, leucine, isoleucine, arginine, asparagine, leucine and leucine; the antibacterial peptide LJ-2 has good antibacterial activity on gram-positive bacteria, gram-negative bacteria and fungi, and has the advantages of low hemolysis, heat resistance, salt resistance, acid and alkali resistance and repeated freeze thawing resistance. Therefore, the antibacterial peptide LJ-2 disclosed by the invention has a wide application prospect in thefields of anti-infective drug preparation, animal husbandry development, human disease prevention and treatment, food preservation, detergents, cosmetics and the like.

The invention discloses a preparation method of low-fluorine silicone rubber used for a ceramic composite insulator. The preparation method comprises weighing 100 parts of methyl vinyl fluorosilicone rubber, 6-9 parts of precipitated silica, 18-25 parts of a fire retardant, 3-7 parts of zinc stearate, 2-6 parts of activated magnesium oxide and 2-5 parts of ferric oxide powder according to a ratio, and uniformly mixing in a double-roller mixing mill so as to prepare a uniform master batch, performing banburying on the master batch in a kneader at 170 DEG C at a vacuum degree of -0.09 MPa for 10-20 min, then adding 0.1-0.3 part of dicumyl peroxide, again performing banburying at 200 DEG C for 3-5 h, and leaving overnight, so as to prepare the low-fluorine silicone rubber. The prepared low-fluorine silicone rubber possesses excellent performances of fluorosilicone rubber, overcomes problems of silicon rubber, is resistant to ageing, possesses excellent acid and alkali resistance, is strong in hydrophobicity, is affordable, and helps to effectively save cost.

The invention discloses an organic silicon/organic fluorine dual-modified polyurethane composite UV photocureable coating as well as preparation and application thereof. The composite UV photocureablecoating provided by the invention has relatively high molecular weight and silicon/fluorine content; by introducing organic silicon into the polyurethane coating, the hydrophobicity, weather resistance, wear resistance, cold resistance, biocompatibility, aging resistance and other properties of the modified polyurethane coating can be obviously enhanced, and the polyurethane coating has the advantages of low cost, low VOC, favorable coating adaptability, no toxicity, no irritation and the like, and is easy to clean. In addition, the composite UV photocureable coating is prepared by adding anorganic fluorine polymer with photosensitivity for compounding, so that the composite UV photocureable coating has the properties of low surface energy, acid and alkali resistance, good transparency and the like by virtue of a small amount of fluorine-containing prepolymer modified coating; in addition, organic fluorine and waterborne polyurethane are compounded at the molecular level, the modification effect of the fluorine-containing prepolymer on polyurethane is exerted to the maximum extent, and the fluorine-containing prepolymer can be applied to the fields of electronic packaging, building coatings, metal coatings and the like.

The invention discloses a glass fiber compound surface skin which is prepared from glass fabric, spunlace nonwoven fabric, polypropylene randon copolymer and a binding agent. The binding agent is prepared from liquid resin, quartz sand, dicyandiamide, dimethyl formamide, polyacrylic ester, dipropylene glycol monomethyl ether, dimethicone, fumaric acid, fumaric acid anhydride, trimesic acid, trimesic acid anhydride and a negative ion surface active agent. The invention further discloses a production method of the glass fiber compound surface skin. The method includes the following steps of preparing the raw materials, preparing solidification liquid, conducting rolling and thermocuring, conducting quick cooling to form a semi-solidified plate, cutting the semi-solidified plate, and conducting natural cooling to the normal temperature to obtain the glass fiber compound surface skin. The glass fabric and the spunlace nonwoven fabric are used as base materials, polypropylene random copolymer and the binding agent are added, and the produced glass fiber compound surface skin has excellent performance on the aspects of appearance, high compactness, high strength, abrasion resistance, high temperature resistance, corrosion resistance, acid and base resistance and low expansion.

The invention discloses an amino-terminated fluorine-containing prepolymer modified acrylate coating and a preparation method thereof. The amino-terminated fluorine-containing prepolymer modified acrylate coating comprises 100 parts of amino-terminated fluorine-containing prepolymer modified acrylate resin, 0.1-2.5 parts of an antifoaming agent, 0.1-1 part of a leveling agent, 0.1-2.5 parts of a dispersant, 0.1-1.5 parts of a promoter, 0.1-50 parts of a filler and 20-50 parts of a solvent A. The amino-terminated fluorine-containing prepolymer modified acrylate coating is prepared through compounding an amino-terminated fluorine-containing prepolymer having a length-controllable fluorine-containing chain segment with acrylate resin, the high molecular weight and the fluorine content of the fluorine-containing prepolymer are controlled to make the fluorine-containing segment easily enriched to the air-coating surface of a cured coating and the fluorine content of the surface far higher than the fluorine content of the body, so the surface of the cured coating has low surface energy, acid and alkali resistance and other excellent performances.