97 results about "Iminodiacetic acid" patented technology

The invention belongs to the technical field of nano magnetic beads, and relates to a carboxyl nano magnetic bead and application thereof in DNA capture and DNA release. The invention discloses a preparation method of carboxyl nano magnetic beads, which comprises the following steps: dissolving iminodiacetic acid in a sodium hydroxide solution, stirring in an ice bath, dropwise adding a silane coupling agent, carrying out a first heating reaction, cooling in the ice bath, dropwise adding the silane coupling agent again, carrying out a second heating reaction, and cooling in the ice bath to obtain a carboxyl silane coupling agent; and dispersing the ferroferric oxide / silicon dioxide hydroxyl magnetic compound and a carboxyl silane coupling agent in an organic solvent, and stirring for reaction to obtain the carboxyl nano magnetic beads. The carboxyl nano magnetic bead is a nano-scale magnetic bead, is large in specific surface area, good in suspension property and not easy to settle, and has multiple sites for DNA binding; the method can be used for effectively extracting DNA ladders and cfDNA in nucleic acid capture and nucleic acid release.

The invention provides a method for preparing high-purity hafnium tetrachloride by wet extraction and separation, which comprises the following steps: stirring and leaching hafnium alloy waste serving as a raw material by using HNO3 and HF mixed acid, then adding thioacetamide, adjusting the pH value to 4-5, stirring and filtering; compounding tributyl phosphate, trioctylphosphine oxide and sulfonated kerosene to obtain a composite extracting agent, and stirring and mixing to form a homogeneous organic phase; in a hydrochloric acid medium, controlling the volume ratio of an organic phase to a water phase to be (2.5-3.5): 1, carrying out three-stage counter-current extraction, and standing for phase splitting; the extracted organic phase passes through an adsorption column filled with iminodiacetic acid modified silica gel; and carrying out reverse extraction by using a hydrochloric acid solution, and then carrying out reduced pressure evaporation concentration, cooling crystallization and dehydration to obtain hafnium tetrachloride. According to the method, the zirconium and hafnium separation efficiency in the hafnium tetrachloride preparation process is improved, and the problem that the content of zirconium and hafnium impurities in the product is too high is solved.

The invention relates to the technical field of resource recycling of manganese-containing wastewater, in particular to a process for preparing industrial-grade manganese carbonate by using a recycled manganese chloride solution, which adopts a two-stage purification and impurity removal strategy, performs primary purification and impurity removal by using sodium sulfide and sodium fluoride, and performs secondary impurity removal by using iminodiacetic acid grafted chelating resin. According to the invention, the problems of poor adaptability and incomplete impurity removal of the manganese chloride solution in the prior art are solved, the purity of the product is obviously improved so as to meet the requirements of the industrial grade manganese carbonate, and the process flow is simple.

The invention relates to a coprecipitation method for preparing cobaltosic oxide, which comprises the following steps: mixing a cobalt salt solution, a precipitant solution and a complexing agent solution in a carbonate base solution in a parallel flow manner, and carrying out first coprecipitation reaction to a first particle size to obtain a seed crystal; the cobalt salt solution, the precipitant solution and the complexing agent solution are mixed in a parallel flow mode, a second coprecipitation reaction is conducted, and cobalt carbonate powder is obtained; calcining the cobalt carbonate powder to obtain cobaltosic oxide with a median particle size D50 of 18-20 [mu] m; a complexing agent in the complexing agent solution is iminodiacetic acid. According to the invention, by using the specific complexing agent, cobalt ions exist in the system in the form of complex ions and are slowly released in the reaction process, so that the first coprecipitation reaction can be carried out orderly, and the cobaltosic oxide with the median particle size D50 of 18-20 [mu] m can be obtained.

The invention relates to the technical field of hydrogel materials, and discloses an oxygen-permeable silicon hydrogel material for contact lenses and a preparation method thereof.The preparation method comprises the steps that ethylene glycol diglycidyl ether and bis (2-chloroethyl) amine hydrochloride are subjected to a ring-opening reaction, and an intermediate product 1, 2-propylene glycol is obtained; carrying out substitution and hydrolysis reaction on the polyalkenyl quaternary ammonium salt and diethyl iminodiacetate to obtain an intermediate product 2, and carrying out quaternization reaction on the intermediate product 2 and chloropropene by utilizing a tertiary amine structure contained in the intermediate product 2 to obtain the polyalkenyl quaternary ammonium salt. And finally, carrying out polymerization reaction on the silicon hydrogel, hydroxyethyl methylacrylate, gamma-(methacryloyloxy) propyltrimethoxysilane and vinyl-terminated dimethyl polysiloxane, putting the obtained product into a contact lens half mold for reaction, and demolding to obtain the oxygen-permeable silicon hydrogel material. The hydrogel material prepared in the invention has good hydrophilic effect and oxygen permeation effect, and can be widely applied to contact lenses.

The invention provides epoxy resin for halogen-free flame-retardant self-leveling powder coating and a preparation method of the epoxy resin, and belongs to the technical field of powder coating. The flame retardant is mainly prepared from anhydrous piperazine, bisphenol A diglycidyl ether, trihydroxymethyl phosphorus oxide, triethyl phosphite, epoxy chloropropane, sodium hydroxide, N-methyl iminodiacetic acid, ethylene glycol diglycidyl ether and other main raw materials through polymerization. The prepared epoxy resin and 2-phenylimidazoline are subjected to low-temperature curing (135 DEG C / 20 min) on the premise that an additional flatting agent does not need to be used, the flexibility of a coating film is good, the impact resistance grade is high, the impact performance reaches the condition that no cracking phenomenon exists in the front and back 60cm, the leveling grade reaches the grade 7 or above, the gloss is high and reaches 95% or above, the oxygen index reaches 34% or above, and the halogen-free flame retardant performance is excellent.

A secondary battery and an electric device. The secondary battery comprises a composite separator and an electrolyte. The composite separator comprises a base membrane and a functional resin layer arranged on the surface of the base membrane. The functional resin layer comprises a functional polymer. The functional polymer contains an iminodiacetate group. Cations of the iminodiacetate group include at least one of Li+, Na+, and K+. At 25°C, the conductivity of the electrolyte is greater than or equal to 5 mS / cm.

The invention relates to a diamond wire cutting fluid for silicon wafer cutting and a preparation method and application thereof, and the diamond wire cutting fluid comprises the following components by weight: 10-45 parts of a composite additive; 2-6 parts of a functional agent; 10 to 30 parts of a solvent; 0.1-1 part of an auxiliary agent; and 30-50 parts of ultrapure water. The composite additive is used, fatty alcohol-polyoxyethylene ether sulfate has excellent wettability and permeability, after fatty alcohol-polyoxyethylene ether sulfate and N-acyl substituted iminodiacetate are used together, closer interface arrangement can be formed, the dynamic surface tension is reduced more quickly, the wetting process is accelerated, and the wetting and infiltration capacities are improved; the stability of the cutting fluid is kept.

The invention discloses a treatment method of electroplating wastewater, and belongs to the technical field of electroplating wastewater treatment. The process comprises the following steps: electrically adjusting the pH value of the electroplating wastewater to 2.5-4.0, adding ferrite, adopting a Ti / PbO2 anode and a graphite cathode, controlling the current density to 15-30mA / cm, introducing air, reacting for 40-80 minutes, and adjusting the pH value to 6.0-7.0 after the reaction; introducing the wastewater into a chelating resin column, wherein the chelating resin is an amino phosphonic acid type or iminodiacetic acid type; the method comprises the following steps of: introducing into a built-in filter column, loading two layers of recrystallized silicon carbide honeycomb ceramic membranes in the filter column in parallel, performing cross-flow filtration under the conditions that the operation pressure is 0.8-2.0 MPa, the temperature is 25-40 DEG C and the cross-flow velocity is 1.5-3m / s, and collecting permeate; the permeate liquid is used for backwashing every 8-12 hours of operation. According to the method, heavy metal ions in the electroplating wastewater can be effectively removed, and the treatment efficiency of the electroplating wastewater is improved.

The application relates to the technical field of lithium ion batteries, and discloses a silicon-carbon nanotube composite material, which is obtained by dehydration of hydroxylated silicon particles, hydroxylated carbon nanotubes and iminodiacetic acid. The silicon-carbon nanotube composite material provided by the application can anchor the silicon particles on the carbon nanotubes through covalent bond action, can increase the uniformity of dispersion of the carbon nanotubes and the silicon particles, can improve the electron transmission capacity, can play a certain counterforce on the volume expansion force of the silicon particles, can reduce the generation of electrode cracks, can further reduce the consumption of electrolyte, and can improve the cycle stability of the whole electrode. Meanwhile, the preparation method provided by the application does not need a complex operation process, has simple process condition requirements, and is suitable for large-scale production.

Provided is a technology for more effectively adsorbing scandium by suppressing the amount of chromium adsorbed onto a chelate resin in an ion exchange treatment of an acidic solution containing scandium and impurities including chromium using the chelate resin.　The present invention comprises an ion exchange treatment step for passing an acidic solution containing scandium and impurities including chromium through a column filled with an iminodiacetic acid-type chelate resin to adsorb the scandium onto the chelate resin, wherein, in the ion exchange treatment step, the acidic solution is passed in the range of 40-70ºC, and when the amount of the scandium adsorbed onto the chelate resin is qSc and the maximum amount of the scandium adsorbed onto the chelate resin is qmax,Sc, the passed liquid amount BV in which qSc / qmax,Sc is 0.5 is defined as a lower limit value and the value of the passed liquid amount BV in which the apparent separation factor αapp,Cr(III) Sc(III), defined by the relationship between the scandium and the chromium contained in the acidic solution, is 1 is defined as an upper limit value, and the passed liquid amount BV of the acidic solution is set in the range of the lower limit value to the upper limit value.

The present invention belongs to the technical field of the preparation of chelating agents and provides a chelating agent containing a hydroxyaminocarboxylic acid, a preparation method therefor, and a use thereof. In the present invention, an epoxysuccinic acid and a metal salt of an iminodiacetic acid are synthesized on the basis of a technique such as a plurality of steps of Michael addition reaction or cyclization, and the epoxysuccinic acid and the metal salt of the iminodiacetic acid then undergo an addition reaction to obtain a chelating agent containing a hydroxyaminocarboxylic acid. The chelating agent containing the hydroxyaminocarboxylic acid has good chelating performance, relatively good chelating performance on calcium, magnesium, iron, copper, or other metals, and a wide application range. The chelating agent containing the hydroxyaminocarboxylic acid has very high solubility in both a high-concentration alkali aqueous solution and a high-concentration acid aqueous solution and has excellent stability during storage. The chelating agent containing the hydroxyaminocarboxylic acid has mild reaction conditions, basically no waste during production, and a good industrial application value and social value.

The invention belongs to the technical field of pharmaceutical chemicals, and particularly relates to a method for preparing guanidinoacetic acid from glycine mother liquor. Based on a glycine-cyanamide method, a glycine solution containing iminodiacetic acid is used as one of reaction raw materials. When the method is used for preparing the guanidinoacetic acid, the glycine mother liquor can be directly used for preparing the guanidinoacetic acid, so that the mother liquor is directly treated, the separation step of the glycine mother liquor is omitted, and the process is simplified. Moreover, the method has an unexpected technical effect on the improvement of the yield of the guanidinoacetic acid, and the yield of the guanidinoacetic acid is improved by 6.2-6.4% compared with the prior art.

The invention relates to an adsorbing material for blood perfusion and a preparation method thereof. The preparation method comprises the following steps: providing a hydrophobic porous carrier which comprises styrene-divinyl benzene copolymer microspheres, and introducing a coordination group on the surface of the hydrophobic porous carrier through chemical modification. The average pore size of the hydrophobic porous carrier is 2-50 nm, and the specific surface area of the hydrophobic porous carrier is greater than or equal to 500 m < 2 > / g; the coordination group is selected from at least one of iminodiacetic acid (IDA), ethylenediaminetetraacetic acid (EDTA) and N, N, N-tricarboxymethyl ethylenediamine (TED). The prepared adsorption material is high in A beta removal capacity, has certain removal capacity on heavy metal ions, is good in blood compatibility and excellent in anticoagulation performance, and is an ideal material for preparing a blood perfusion device.

This invention relates to the field of high-purity material analysis technology, and discloses a method for simultaneously separating and enriching copper, cadmium, nickel, cobalt, zinc, lead, and barium in lithium carbonate. The steps are as follows: dissolving a lithium carbonate sample in nitric acid to obtain an acidified sample solution; adjusting the acidified sample solution to an alkaline pH range of 9.5-10.5 using an ammonia-ammonium acetate alkaline buffer solution; passing the alkaline solution through a solid-phase extraction column filled with iminodiacetic acid-type chelating resin, where copper, cadmium, nickel, cobalt, zinc, lead, and barium ions are selectively adsorbed onto the resin; and eluting the adsorbed heavy metal ions with acid to achieve separation and enrichment. This invention effectively overcomes the inhibition and interference of the lithium carbonate matrix on the detection of trace heavy metals, and in particular significantly improves the adsorption and recovery rate of elements such as barium. It achieves efficient separation and enrichment of multiple heavy metals in complex matrices, providing a reliable pretreatment solution for high-sensitivity and high-accuracy quality control analysis of lithium carbonate products.

The invention discloses polymer resin for removing metal impurities in a cyanide-free electroplating cadmium solution as well as a preparation method and a use method of the polymer resin, and relates to the technical field of functional materials. The invention relates to a polymer resin for removing metal impurities in a cyanide-free electroplating cadmium solution. The polymer resin comprises a polymer matrix, cyclodextrin covalently crosslinked to the polymer matrix and a functionalized functional group for functionally modifying the polymer matrix, the functionalized functional group comprises an iminodiacetic acid group, a sulfydryl group and an amido group. According to the invention, cyclodextrin is introduced into a polymer matrix through covalent cross-linking, then three functional groups with high metal affinity are used for modification, and through the inclusion effect of cyclodextrin and the targeted collaborative design of the three functional groups, the ability of polymer resin to selectively capture metal impurities is enhanced; even in the environment of competing with EDTA, NTA and other strong chelating agents, the metal impurities can still be effectively combined and removed by breaking the competition barrier.

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a composite sodium supplement additive which comprises the following raw material components: disodium iminodiacetate, conductive porous carbon and a metal oxide quantum dot catalyst, the metal oxide quantum dot catalyst is coated with the disodium iminodiacetate active particles, and the disodium iminodiacetate active particles are adsorbed on the inner wall and the outer wall of the conductive porous carbon to form the composite sodium supplement additive, and the particle size of the composite sodium supplement additive is 1-500 nm. The composite sodium supplement additive takes conductive porous carbon as a load matrix; the conductive porous carbon comprises any one or more of activated carbon, carbon nanotubes, ordered mesoporous carbon and bamboo charcoal. The active ingredients in the composite sodium supplement agent are small in particle size, good in conductivity and low in decomposition voltage, and an excellent sodium supplement effect can be achieved under the condition of low addition.

The application discloses an industrial wastewater zero-discharge treatment process and relates to the technical field of industrial wastewater treatment. The application adopts a combined process of "air flotation+softening precipitation+catalytic oxidation+multi-medium filtration+ultrafiltration+DTRO+RO" to concentrate wastewater, and the concentrated water of the DTRO is treated through a process of "softening precipitation+multi-medium filtration+evaporation crystallization". Meanwhile, a modified monomer is generated through an imino nucleophilic acyl substitution reaction of maleic anhydride and diethyl iminodiacetate, and the modified monomer is acidified by hydrochloric acid to obtain an acidified modified monomer containing a large amount of carboxyl groups; then, the acidified modified monomer is subjected to a free radical polymerization method together with hydroxyethyl methacrylate and 2-acrylamido-2-methylpropanesulfonic acid sodium to obtain an oily copolymer; and finally, the copolymer is adsorbed by porous ceramic particles, the surface of the particles is sprayed with aluminum dihydrogen tripolyphosphate encapsulation, and a final silicon removal agent is formed.

The invention discloses a main catalyst for olefin polymerization, the main catalyst comprises a titanium-containing compound, a magnesium-containing compound, halogen and an internal electron donor, the internal electron donor is an iminodiacetate compound, and the invention also discloses a preparation method of the main catalyst. The invention also discloses a catalyst system for olefin polymerization, which comprises the main catalyst, a cocatalyst and an external electron donor, a preparation method of the catalyst system, and a method for olefin (co) polymerization by using the catalyst system. The invention also discloses an iminodiacetate compound and application of the iminodiacetate compound as an internal electron donor in an olefin polymerization catalyst.

The present invention provides a technology that suppresses the amount of chromium adsorbed onto a chelate resin during ion exchange treatment performed on an acidic solution containing scandium and chromium using the chelate resin, thereby achieving more effective adsorption of scandium.　The present invention includes an ion exchange treatment step in which an acidic solution that contains scandium and impurities including chromium is passed through a column filled with an iminodiacetic acid type chelate resin so as to cause scandium to be adsorbed onto the chelate resin. In the ion exchange treatment step, the acidic solution is passed at a temperature in the range of 15°C to 45°C. When the adsorption amount of scandium onto the chelate resin is qSc and the maximum adsorption amount of scandium onto the chelate resin is qmax, Sc, the passed amount BV of the acidic solution at which qSc / qmax, Sc = 0.5 is defined as a lower limit value, and the passed amount BV of the acidic solution at which the maximum adsorption amount of scandium onto the chelate resin, i.e., qmax, Sc, is achieved is defined as an upper limit value, and the passed amount BV of the acidic solution is set within a range between the lower limit value and the upper limit value.

This invention provides a MoTi film composite etchant composition, relating to the field of metal film etching technology. The composite etchant composition comprises hydrogen peroxide, ammonium hydrogen fluoride, a weak organic acid, a corrosion inhibitor, cis-1,4-cyclohexanedicarboxylic acid, 3-amino-1,2,4-triazole, a complexing agent, iminodiacetic acid, an organic alcohol, and water; and the ratio of ammonium hydrogen fluoride to cis-1,4-cyclohexanedicarboxylic acid is ≥0.2. This invention overcomes the shortcomings of existing technologies, effectively improving the etching efficiency of MoTi films while reducing erosion of adjacent metal layers, achieving precise control of the etching rate, ensuring etching stability, and significantly improving product yield.

The invention relates to the technical field of textile printing and dyeing, in particular to a dyed fabric wet rubbing fastness improver and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing a polyurethane prepolymer from polytetrahydrofuran ether glycol and diisocyanate, then preparing a polyurethane intermediate from micromolecular diol 1, 4-butanediol and a tertiary amine type diol chain extender N-butyl diethanol amine as chain extenders, then preparing polyurethane from diethyl iminodiacetate as an end-capping reagent, and finally preparing the polyurethane prepolymer. And finally, bromobutane is used as a quaternization reagent to prepare cationic polyurethane, the cationic polyurethane and acrylamide are polymerized and crosslinked under the action of an initiator to prepare the dyed fabric wet rubbing fastness improver, and an organic silicon chain segment is introduced into a polyurethane prepolymer molecular chain, so that the dyed fabric wet rubbing fastness improver is prepared. The prepared wet rubbing fastness improver for the dyed fabric can effectively improve the wet rubbing fastness of the dyed fabric, and meanwhile, the dyed fabric treated by the wet rubbing fastness improver for the dyed fabric has good softness.

The invention discloses an etching solution for alloy surface treatment and a preparation method thereof, and relates to the field of etching solutions. The preparation method comprises the following steps: firstly, preparing mesoporous titanium dioxide by a sol-gel method, modifying the mesoporous titanium dioxide by an amino coupling agent, loading green tea polyphenol and preparing a self-made corrosion inhibitor from konjac glucomannan grafted with quaternary ammonium groups, adsorbing dopamine by utilizing electrostatic interaction, and polymerizing to form pH response hydrophilic particles; in the etching process, when the solution is slightly acidic, the corrosion inhibitor is released to inhibit excessive etching; meanwhile, carboxymethyl cellulose is grafted with sulfonic acid groups, N-(phosphonomethyl) iminodiacetic acid modified chitosan is used for preparing complexing agents A and B, and after compounding, the complexing agents A and B are mixed with components such as hydrophilic particles to obtain etching liquid; the compound complexing agent can form a strong coordination bond with metal ions and can also be chelated with heavy metal ions; chitosan, phosphonic acid groups and hydrophilic particles cooperate with one another, so that the surface hydrophilicity of the alloy is improved, and hydrolytic precipitation and scale attachment are effectively inhibited. The prepared etching liquid for alloy surface treatment has the effects of high efficiency and uniform etching.

This invention relates to the field of sodium-ion battery electrode materials technology, and provides a method for the complete dissolution preparation of a carbon-coated sodium carbonate pre-sodiumizing agent: sodium polyacrylate and disodium iminodiacetic acid are added to deionized water and stirred until completely dissolved to form a homogeneous and transparent mixed aqueous solution; the solution is then spray-dried and granulated to obtain spherical precursor microspheres; the precursor microspheres are calcined at 450-950℃ for 0.5-12 hours under an inert atmosphere, and after natural cooling, the carbon-coated sodium carbonate pre-sodiumizing agent is obtained. This invention also provides the carbon-coated sodium carbonate pre-sodiumizing agent prepared by the above method and its applications. The preparation process of this invention is simple, the raw materials are inexpensive and readily available, and the resulting product has good particle dispersibility, no obvious agglomeration, uniform and complete carbon coating, excellent desodiumization performance, and high pre-sodiumization efficiency. It can significantly improve the initial coulombic efficiency and cycle stability of sodium-ion full batteries, is compatible with existing battery industrial production systems, and has good prospects for industrial application.

The invention discloses a zinc ion battery electrolyte for in-situ induction of a double-layer solid electrolyte interface, the electrolyte comprises a solvent and an additive, the solvent comprises a zinc sulfate solution, and the additive comprises iminodiacetic acid (IDA) and zinc trifluoromethanesulfonate Zn (OTF) 2. The invention also discloses an application of the electrolyte in a zinc ion battery. The zinc ion battery electrolyte provided by the invention can realize in-situ construction of a stable and anti-dissolution dual-function SEI on the surface of a zinc metal negative electrode, so that dendritic crystal growth, side reaction and interface failure are inhibited, the cycle life of a zinc battery is prolonged, and the safety of the zinc battery is improved.

The present invention relates to the field of environmental materials and water treatment technologies, and particularly to a graphene amino silica composite adsorbent for heavy metal wastewater treatment and its preparation method, including nanoparticles, an amino-functionalized silica coating layer, carboxylated reduced graphene oxide, a polydopamine modification layer, tetraethyl orthosilicate, 3-aminopropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, N-((4-vinylbenzyl)iminodiacetic acid), chitosan, β-cyclodextrin, cetyltrimethylammonium bromide, polyethylene glycol, L-ascorbic acid, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride, and N-hydroxysuccinimide, which exhibits excellent adsorption performance for various heavy metal ions, far higher than that of traditional adsorbents and existing composite adsorbents.

The present invention belongs to the technical field of molecular recognition adsorption separation functional materials, and discloses a preparation method and application of a Pickering emulsion interface-induced confined polymerization imprinted adsorbent. The present invention uses glycidyl methacrylate nanospheres as the matrix material, reacts with iminodiacetic acid and FeCl3 solution to modify carboxyl groups on its surface and chelate ferric ions, and uses this as Pickering particles to stabilize the water-in-oil (O / W) Pickering emulsion with dichloromethane as the oil phase, so that the water-soluble target molecule AMP attracted by ferric ions to the surface of Pickering particles forms a base complementary pairing interaction with the oil-soluble functional monomer 1-(vinylbenzyl) thymine at the oil-water interface of the emulsion; then, ultraviolet light is used to initiate the confined polymerization of MIPs on the surface of Pickering particles, rather than the polymerization in the oil phase or water phase in the prior art. The adsorbent obtained by this invention enables the imprinting process to get rid of the limitation of the different solubilities of the template molecule and the functional monomer in oil or water, and is used for the rapid, large-scale, and precise adsorption and separation of AMP in aqueous solution.

The present invention relates to the field of building materials technology, in particular to a kind of flame retardant and water-resistant magnesium oxysulfate board and its manufacturing process. The present invention discloses the following scheme: light-burned magnesium oxide powder, magnesium sulfate heptahydrate, water, fly ash, citric acid, iminodiacetic acid type chelating resin are mixed to obtain magnesium oxysulfate mixed slurry; using hydrogen-terminated polydimethylsiloxane and 10-undecenal as raw materials, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is grafted after the reaction, and then isophorone diisocyanate is used for end-blocking to obtain an isocyanate-terminated silicon-containing flame retardant; the isocyanate-terminated silicon-containing flame retardant is used for modified epoxy resin, and is mixed with epoxy toughening agent and tetraethylene pentamine to prepare epoxy resin glue; glass fiber cloth is immersed in epoxy resin glue, then combined with magnesium oxysulfate mixed slurry, and solidified to obtain magnesium oxysulfate board. The magnesium oxysulfate board prepared by the present invention has high strength and good flame retardancy and water resistance.

The application relates to an iminodiacetic acid type chelating resin and a preparation method and application thereof, and the preparation method comprises the following steps: (1) in the case that the stirring speed is 200-350 r / min, two dispersants are dissolved in water, then ethylbenzene, glycidyl methacrylate, trimethylolpropane trimethacrylate, isooctane and di-t-butyl peroxide are added, the raw materials are reacted after ultrasonic mixing, centrifugal separation is carried out after the reaction is completed, the filter cake is cleaned and dried, and resin microspheres are obtained; (2) in the stirring state, the resin microspheres obtained in the step (1) are added into water, then iminodiacetic acid is added, stirring is continued, then preliminary reaction is carried out by heating, NaOH is further added, reaction is carried out by heating, after the reaction is completed, filtration, cleaning and drying are carried out, and the iminodiacetic acid type chelating resin is obtained. The chelating resin particle size can be controlled, the particle size is relatively large, the specific surface area is large, the adsorption capacity is high, and the chelating resin can be used for adsorbing lead ions in heavy salt matrix.

The invention discloses a plasma biomarker related to the character of the total litter size of sows and application of the plasma biomarker, and a group of effective organic acid biomarkers including 1-deoxyvaleric acid, arginine succinic acid, cinnamic acid, iminodiacetic acid and risedronic acid are analyzed and excavated by utilizing metabonomics. The total litter size of the sow is simply, conveniently and rapidly predicted through the biomarker, the work of selecting and remaining the total litter size of the sow in advance can be assisted, the problem that accurate breeding through a genome is difficult due to low heritability of the total litter size is solved, and then improvement of the character of the total litter size of the sow is promoted.