1117 results about "Thiokol" patented technology

The invention discloses a transparent composition photoresist with low shrinkage and low vacuum deflation. Comprising the following raw materials in percentage by mass: 1-5% of modified polyhedral oligomeric silsesquioxane (POSS), 1-5% of an expanding monomer, 1-5% of modified acrylic resin, 1-5% of epoxy resin, 1-5% of a thiol cross-linking agent, 1-5% of an initiator, 0.1-3% of a curing accelerator, 0.2-0.5% of a flatting agent, 0.1-5% of a silane coupling agent, 0.01-0.2% of an antioxidant and 80-90% of an electronic-grade organic solvent. The invention also provides a preparation method of a cured coating prepared from the transparent composition photoresist with low shrinkage and low vacuum deflation. The product provided by the invention not only can maintain the properties of high hardness, high thermal stability, high planarization ability, high barrier property, low hygroscopicity, low dielectric constant and the like of the transparent composition photoresist coating, but also can enable the transparent composition photoresist coating to have excellent low shrinkage and low outgassing, thereby achieving the purposes of saving energy, reducing emission, reducing cost and improving efficiency; the low shrinkage of the transparent composition photoresist coating also widens the development of the material in the fields of other panel production processes such as OLED (Organic Light Emitting Diode) and the like.

The invention provides a novel polynorbornene anion exchange ionomer containing a polar functional group as well as a preparation method and application of the novel polynorbornene anion exchange ionomer. The polynorbornene has excellent thermal stability and chemical stability. Meanwhile, the AEI main chain of the polynorbornene has no aryl group, so that the adsorption influence caused by the aryl group is avoided. The synthesized addition polynorbornene AEI in the form of quaternary ammonium salt can be dissolved in a low-boiling-point solvent, and it is ensured that a membrane electrode can be prepared through a solvent casting method. Besides the solubility of the AEI, the addition polynorbornene-based AEI in the form of quaternary ammonium salt is modified by utilizing a thiol-ene click reaction, an anion exchange ionomer containing a polar functional group can be prepared, the interaction between the AEI and an electrolytic catalyst is improved, the reaction is simple and easy to operate, the universality is high, and the method is suitable for industrial production. And the current density in the AEMWE system containing the AEI can be effectively improved.

The preparation method comprises the following steps: mixing 20-40 parts by mass of substituted hydroxymethyl glycoluril, 45-85 parts by mass of mercaptocarboxylic acid and 0.5-3 parts by mass of an acidic catalyst, stirring and reacting for 1-10 hours at the temperature of 50-150 DEG C under the pressure condition of-0.01 to-0.1 MPa, adding 300-800 parts by mass of an organic solvent for diluting after the reaction is finished, washing and purifying with deionized water, and collecting an organic layer, thereby obtaining the mercaptan curing agent. Concentrating and drying to obtain the mercaptan curing agent. According to the thiol curing agent, the rigid glycoluril group is introduced, so that the rigidity of a cured product structure is improved, and the mechanical property, the adhesive property, the heat resistance and the damp-heat aging resistance of a cured product are improved; four tertiary amine groups in the substituted glycoluril have a certain self-promotion effect on a thiol curing epoxy reaction, and the curing reaction temperature is reduced under the condition that an accelerant is not added; the glycoluril-containing thiol epoxy resin curing agent disclosed by the invention has good application value and development prospect.

The invention relates to an automobile paint surface protective film agent and a preparation method thereof, and belongs to the technical field of automobile beauty. The automobile paint surface protective film agent is prepared from the following raw materials: amino functional polysiloxane, fluorine modified acrylic resin, epoxy modified organic silicon emulsion, functional filler, a surfactant, hydrophobic modified silicone oil, a brightening agent, a penetrating agent, a cosolvent and deionized water, and the raw materials are blended to prepare the automobile paint surface protective film agent. The functional filler is prepared by firstly carrying out surface modification on a polymer and then carrying out click chemistry on dodecanethiol on hydroxylated nano silicon dioxide, and the polymer is prepared by carrying out nucleophilic addition on poly (ethylene glycol) methacrylate Mn360, poly (ethylene glycol) methacrylate Mn500 and isophorone diisocyanate. The automobile paint surface protective film agent is high in film forming speed, a formed film layer has the characteristic of multiple effects, and meanwhile, the wear resistance is also very good.

The invention discloses a high-reliability PbS quantum dot film, a preparation method thereof and a photoelectric device. The preparation method comprises the following steps: 1) obtaining a first quantum dot solution; 2) adding medium-chain and long-chain amine; 3) adding an anti-solvent; 4) obtaining medium-chain and long-chain amine modified PbS quantum dot solids; 5) obtaining a second quantum dot solution; (6) forming a PbS quantum dot coating; 7) forming a mercaptan solution; 8) coating the PbS quantum dot coating with a mercaptan solution; (9) annealing treatment; 10) forming a new PbS quantum dot coating, and coating the new PbS quantum dot coating with a mercaptan solution; according to the PbS quantum dot thin film and the preparation method thereof, through the induction and synergistic effect of halogen atoms, the binding capacity of halogenated mercaptan ligands and the surface of the PbS quantum dot thin film is enhanced, the surface defect state of the PbS quantum dots is effectively inhibited, and the reliability of the PbS quantum dot thin film and a photoelectric device under the conditions of high temperature, high humidity and long-time illumination is remarkably improved.

The invention belongs to the technical field of optical materials, and particularly relates to an environment-friendly mercaptan optical resin material and a preparation method thereof. Comprising the following steps: (1) uniformly mixing a catalyst, a release agent and a polyisocyanate compound to prepare a mixture; (2) adding titanium dioxide nanoparticles with different particle sizes, which are modified by a polythiol compound and a sulfydryl silane coupling agent, into the mixture; and (3) heating and curing to prepare the environment-friendly mercaptan optical resin material. On the basis of small-particle-size titanium dioxide, a small amount of large-particle-size titanium dioxide is added. The large-particle-size titanium dioxide is not prone to agglomeration and good in dispersity, in the blending process, the granular large-particle-size titanium dioxide is easier to disperse, and agglomeration of small-particle-size titanium dioxide is prevented. Due to the addition of the small-particle-size titanium dioxide and the large-particle-size titanium dioxide, the mechanical strength of the mercaptan optical resin is further improved on the basis of maintaining the high refractive index of the mercaptan optical resin.

The invention discloses a medical washable high-temperature-resistant modified polyester fiber fabric and a preparation method thereof, and relates to the technical field of fabrics. The medical washable high-temperature-resistant modified polyester fiber fabric prepared by the invention is obtained by blending, spinning and weaving modified polyester and modified mica and activating with sodium hypochlorite; the modified polyester is obtained by grafting organic silicon modified polyester with n-dodecanethiol and then reacting with bromooctylhydantoin; the modified mica is prepared by polymerizing diethyl phosphite and bisphenol S on the surface of the pretreated mica, grafting a vinyl monomer and then reducing; the vinyl monomer is obtained by carrying out a reaction on 1-allyl-3-cyano-6-hydroxy-4-methyl-2-pyridone and an azo salt, and the vinyl monomer is obtained by carrying out a reaction on 1-allyl-3-cyano-6-hydroxy-4-methyl-2-pyridone and an azo salt; the medical washable high-temperature-resistant modified polyester fiber fabric prepared by the invention has good antibacterial, anti-aging and flame-retardant properties.

The invention discloses a method for preparing 12-mercaptan through solid organic acid catalysis, belongs to the technical field of 12-mercaptan preparation, and aims to solve the problems of low catalyst activity, harsh reaction conditions, serious pollution, high cost and dependence on import in the prior art. N-dodecanol and hydrogen sulfide are used as raw materials and are mixed according to the molar ratio of 1: 1.2-1: 1.3; the method comprises the following steps: gasifying n-dodecanol, mixing with purified hydrogen sulfide, preheating to 210-240 DEG C, introducing into a fixed bed reactor filled with a solid organic acid catalyst, and reacting at-0.08-3.0 MPa for 3.5-4 hours; and cooling and condensing the reaction product, carrying out gas-liquid separation, rectifying and purifying the liquid product to obtain 12-mercaptan with the purity of more than or equal to 99.5%, and recycling unreacted hydrogen sulfide. The solid organic acid can be a catalyst of p-toluenesulfonic acid and the like or mesoporous silica loaded nickel, cobalt and molybdenum metal oxides. The method has the advantages of high catalytic activity, mild reaction conditions, high product yield (the conversion rate of n-dodecanol is greater than or equal to 94.5%), environmental protection and low cost, can realize the domestic mass production of 12-mercaptan, and meets the market demand.

The invention discloses a preparation method of a polymer dispersed liquid crystal holographic grating with s polarization high diffraction characteristics, and belongs to the technical field of holographic optics. Raw materials comprise 60-90% of a thiol-ene monomer, 10-40% of liquid crystals, a photoinitiator accounting for 1.25% of the mass of the monomer, and a coinitiator accounting for 1.56% of the mass of the monomer. Light with the wavelength of 532 nm and the light intensity of 5-30 mW / cm < 2 > is used for carrying out double-interference photoetching to generate photochemical reaction so as to generate the polymer grating film, and the light is s polarized light. Under the optimal recording condition, delta n under s polarization can reach 1.93 * 10, and delta n under p polarization can reach 1.21 * 10. In combination with morphology analysis, it is found that refractive index modulation strongly depends on the proportion of a liquid crystal-rich phase to a polymer-rich phase in the grating. It is proved that the size of liquid crystal microdroplets formed by holographic recording is larger due to low recording intensity, and therefore the threshold driving voltage of the HPDLC grating is reduced.

The invention discloses a phosphorus-sulfur synergistic flame retardant with high gas phase activity, a durable flame-retardant nylon fabric and a preparation method of the flame-retardant nylon fabric, and relates to the technical field of flame-retardant nylon fabric preparation.The preparation method of the phosphorus-sulfur synergistic flame retardant comprises the steps that 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and polyepoxide are mixed and heated to be molten for a reaction, and the phosphorus-sulfur synergistic flame retardant is obtained; obtaining an intermediate after the reaction is finished; the intermediate and a thiophenethiol derivative are subjected to a click chemical reaction, and a 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide derivative containing phosphorus and sulfur is obtained; the preparation method comprises the following steps: dissolving a 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide derivative containing phosphorus and sulfur into a mixed solvent of ethanol and water, so as to obtain the phosphorus-sulfur synergistic flame retardant with high gas phase activity. The raw materials are safe and environmentally friendly, the preparation method is simple, and the prepared flame-retardant nylon fabric is excellent in flame retardance and washing resistance and free of pollution in the using process.

The invention provides a method 100 for separating different polymeric spectacle lens materials in a mixture comprising at least two different polymeric spectacle lens materials by separating at least one polymeric spectacle lens material of the at least two different polymeric spectacle lens materials by using their different physical behavior and / or chemical behavior, wherein the at least two different polymeric spectacle lens materials are selected from the group consisting of polyallyl carbonate, polyurea, polyurethane, polyurethane / polyurea, polycarbonate, polyepisulfide and polythiourethane. The invention further provides a method for separating at least one polythiourethane from a mixture comprising at least two different polythiourethanes by thiolysis.

The invention relates to a method for constructing a composite super-hydrophobic coating through double bonding. The preparation method comprises the following steps: taking a clean copper sheet which is not pretreated as a substrate, dipping the copper sheet in a suspension consisting of nanoparticles and sulfydryl-containing siloxane ethanol, taking out, washing, drying, dipping in a perfluoromercaptan ethanol solution, taking out, washing, and drying to obtain the copper-based super-hydrophobic surface coating. The coating prepared by the method has excellent super-hydrophobicity, icing resistance and stability. Different from an existing conventional preparation method, the method has the advantages that pretreatment operation such as abrasive paper polishing, strong acid etching or anodic oxidation does not need to be carried out on a copper sheet, and micro-nano roughening and low-surface-energy self-assembly can be completed on the copper surface only through two-step normal-temperature dipping. The method is simple in preparation process, mild in condition, free of expensive equipment, thin in coating thickness and small in influence on electric conduction and heat conduction of the copper substrate, intrinsic performance of copper can be reserved, the electric conduction / heat conduction characteristic of the copper substrate is considered, and the method has wide application value and prospects.

The invention discloses a self-repairing composite floor for a clean room and a preparation method of the self-repairing composite floor, and the preparation method comprises the following steps: carrying out amination treatment on nano silicon dioxide and carbon quantum dots by using a silane coupling agent, and sulfonating polyethersulfone ketone by using concentrated sulfuric acid; the preparation method comprises the following steps: carrying out curing treatment on epoxy resin, an amine curing agent, N-hydroxyethyl maleimide and tetrakis (3-mercaptopropionic acid) pentaerythritol ester to obtain epoxy-mercaptan resin; the preparation method comprises the following steps: carrying out prepolymerization reaction on vacuum dehydrated polyester polyol, tetrahydroxyethyl ethylenediamine, furanpropanol, diisocyanate, a catalyst, 2, 2 '-thiodiethanol and hydroxyl silicone oil to obtain a star-shaped polyurethane prepolymer, adding epoxy-thiol resin, glyceryl borate, sulfonated polyethersulfone ketone, aminated silicon dioxide, aminated carbon quantum dots and an auxiliary agent, carrying out ultrasonic treatment, and carrying out drying to obtain the star-shaped polyurethane resin. The self-repairing coating material is obtained; and coating the self-repairing coating material on the surface of a base plate, and performing hot-pressing curing molding to obtain the self-repairing composite floor for the clean room.

The invention discloses a negative electrode interface self-repairing material, a negative electrode plate, a positive electrode interface material, a positive electrode plate, a solid electrolyte, a solid-state battery and an electric device, and relates to the technical field of batteries, the negative electrode interface self-repairing material comprises a porous material and a self-repairing material, the self-repairing material comprises a core layer material and a shell layer material at least partially coating the surface of the core layer material, the material of the core layer comprises a thiol-olefin repairing agent and a photoinitiator; the material of the shell layer comprises a self-repairing polymer. Silicon expansion can be inhibited through the porous electrolyte, meanwhile, an ion guide channel is constructed, interface impedance is reduced, meanwhile, the porous electrolyte is stable in chemical performance and compatible with a silicon-based material, and side reactions can be reduced. A three-dimensional network is formed through a mercaptan-olefin click chemical reaction of the self-repairing polymer, in-situ crosslinking can be triggered when cracks are generated, interface cracks can be rapidly and dynamically repaired, fracture of a conductive ion channel is reduced, and therefore interface impedance is reduced.

The present invention provides a polymer production method comprising: (1) a step in which a monomer starting material including a prescribed monomer is polymerized by living radical polymerization using a radical initiator and a RAFT agent to obtain a polymer P-1 having a terminal structure that includes, at a terminal of the main chain thereof, a sulfur atom derived from the RAFT agent; (2) a step in which, subsequent to step (1), a radical generator and a thiol compound are added to a solution including the polymer P-1 and the same is heated to remove the terminal structure from the main chain of the polymer P-1; and (3) a step in which, subsequent to step (2), the solution including the polymer P-1 with the terminal structure removed therefrom is mixed with a poor solvent to precipitate the polymer as a solid and purify the same.

This application relates to the field of polyurethane adhesive technology, and provides a thermally conductive polyurethane structural adhesive and its preparation and application methods. The thermally conductive polyurethane structural adhesive includes a first component and a second component. The first component includes a modified bio-based polyol, a polythiol, a thermally conductive filler, a first dehydrating agent, a thixotropic agent, a first catalyst, and a second catalyst. The second component includes an epoxy resin, a diisocyanate, a polyisocyanate, a thermally conductive filler, a coupling agent, a second dehydrating agent, a dispersant, and a retarder. The modified bio-based polyol is selected from at least one of modified castor oil polyol, modified oil polyol, and modified cashew nut shell oil polyol. The polythiol is selected from at least one of trimethylolpropane tris(3-mercaptopropionate), pentaerythritol tetra(3-mercaptopropionate), butanediol mercaptopropionate, and polythiol. This configuration allows the thermally conductive polyurethane structural adhesive to have a longer open time and to rapidly cure at room temperature in a short time, resulting in high initial strength.

The invention belongs to the technical field of biomedical materials and regenerative medicine, and relates to collagen-based injectable fiber hydrogel as well as a preparation method and application thereof. According to the injectable fiber hydrogel, methacrylated collagen and dithiothreitol are subjected to a thiol-ene click reaction rapidly under the action of a photoinitiator through illumination, a primary cross-linked network is formed, and the injection and in-situ gel forming requirements are met; then under the conditions that the pH is 6.5-8.0 and the temperature is 30-39 DEG C, collagen molecules are self-assembled into a nanofiber structure, and a bionic network similar to a natural extracellular matrix is obtained. The hydrogel disclosed by the invention has the advantages of rapid gelation, structural biomimetic property and biological activity; residual sulfydryl endows the hydrogel with active oxygen scavenging capacity, so that oxidative stress can be relieved, and immune response can be regulated; the fibrotic structure promotes cell adhesion, migration and tissue regeneration.

The invention discloses a high-elastic material for an anti-slip sole and a preparation method of the high-elastic material in the field of high polymer materials. The high-elastic material is prepared from the following raw materials: modified polyurethane, modified silicone rubber, calcium carbonate, dicumyl peroxide, 2-mercaptobenzothiazole, N-isopropyl-N '-phenyl p-phenylenediamine and naphthenic oil. Wherein the modified polyurethane is prepared by the following steps: carrying out vacuum dehydration on polybutylene adipate, reacting with toluene diisocynate to prepare an isocyanate-terminated prepolymer, adding dimethylolpropionic acid, triethylamine and deionized water to obtain a water-based dispersion, and carrying out graft copolymerization on the water-based dispersion, methyl methacrylate and the like; the preparation method comprises the following steps: preheating modified polyurethane, mixing with modified silicone rubber at a high speed, adding calcium carbonate and naphthenic oil, carrying out double-roller open milling and thin-passing, adding a vulcanizing agent and the like, carrying out overturning milling, and carrying out flat plate vulcanization molding. The material is used for anti-skid soles, and has the advantages of high elasticity, lasting skid resistance and excellent weather resistance.

The invention relates to the technical field of rubber materials, and discloses fluororubber for a high-temperature oxygen sensor and a processing technology of the fluororubber. The processing technology comprises the following steps: S1, preparing fluorinated modified methyl vinyl silicone rubber from methyl vinyl silicone rubber and 1H, 1H, 2H, 2H-perfluorodecanethiol; s2, preparing glycerol modified silicone rubber from methyl vinyl silicone rubber and 1-thioglycerol; taking glycerol modified silicone rubber, adding into a mixed solvent of tetrahydrofuran and water, uniformly stirring, adding urea, heating, dropwise adding phosphoric acid, carrying out heat preservation reaction, removing the solvent, and drying to obtain phosphate modified methyl vinyl silicone rubber; and S3, adding the broken fluororubber, the fluorinated modified methyl vinyl silicone rubber and the phosphate modified methyl vinyl silicone rubber into an open mill, uniformly mixing, adding the composite filler and magnesium oxide, mixing, adding the vulcanizing agent and the assistant crosslinking agent, uniformly mixing, and vulcanizing to obtain the fluororubber for the high-temperature oxygen sensor.

A method for applying a scavenger material to a wellbore includes providing a precursor scavenger material to a location within a wellbore extending through an earth formation, the precursor scavenger material comprising an acetal or a hydroxyaldehyde, reacting the precursor scavenger material in the wellbore or the earth formation in-situ to form a scavenger material comprising propenal, and reacting the scavenger material with at least one of hydrogen sulfide or a mercaptan to reduce a concentration of the at least one of hydrogen sulfide or the mercaptan. Related methods and systems for applying the scavenger material to the wellbore are also disclosed.

This invention provides a solid waste-based backfill material for improving heavy metal leaching rate and its preparation method. The backfill material comprises the following raw materials in parts by weight: 40-60 parts Bayer red mud, 40-60 parts fly ash, 10-20 parts desulfurized gypsum, 5-8 parts nano-hydroxyapatite, 4-6 parts pumping agent, and 30-60 parts water. The pumping agent is a compound of organosilicon polycarboxylic acid water-reducing agent, polymaleic acid, and thiol-modified cellulose in a mass ratio of 4-6:3:10-12. The thiol-modified cellulose is prepared by a method including the following steps: dissolving carboxymethyl cellulose in water, adding aminothiol compounds, adjusting the pH, adding activators and activating aids, and reacting under controlled temperature. After the reaction, acetone is added until no precipitation occurs. The mixture is then filtered, washed, and dried to obtain thiol-modified cellulose. The heavy metal leaching performance of the backfill material is improved by introducing hydroxyapatite, which can both precipitate and adsorb heavy metals.

The invention discloses sulfide solid electrolyte slurry, a high-density sulfide solid electrolyte film and a preparation method thereof, and belongs to the technical field of all-solid-state batteries. The preparation method of the sulfide solid electrolyte slurry comprises the following steps: mixing polythiol, a solvent, a binder and a sulfide solid electrolyte, and stirring to obtain the sulfide solid electrolyte slurry; wherein the polythiol refers to thiol containing more than two sulfydryl groups. The core innovation of the invention lies in that the polythiol is introduced into the sulfide solid electrolyte slurry, and the S-S interaction force between the sulfydryl of the polythiol and the sulfide solid electrolyte is utilized to effectively reduce the distance between the sulfide solid electrolyte and the sulfide solid electrolyte; and the gap between the sulfide solid electrolyte and the sulfide solid electrolyte is reduced, so that the sulfide solid electrolyte film with higher density is prepared.

The invention relates to the technical field of electrolyte, in particular to a thioether cross-linked solid polymer electrolyte membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: taking N, N-dimethylformamide, respectively adding 3, 6-dioxa-1, 8-octane dithiol and triglycidyl isocyanurate, and uniformly stirring to obtain a mixed solution; adding bis (trifluoromethylsulfonyl) imide lithium into the mixed solution, putting magnetons on a magnetic stirrer, and completely dissolving the magnetons to obtain a precursor solution; and pouring a proper amount of the precursor solution into a polytetrafluoroethylene mold, spreading, and carrying out cross-linking polymerization in a blast oven to form the film. The three-dimensional thioether cross-linked network structure has a large number of weakly coordinated thioether groups, dissociation of lithium salt can be promoted, a large number of free Li < + > is generated, the number of Li < + > is increased, meanwhile, the crystallinity of a polymer is remarkably reduced, the ionic conductivity is improved, the mechanical stability of a film can be improved, and the service life of a battery is effectively prolonged.

Provided is a composition which contains a base generator and a polymerizable compound. The base generator contains a salt of a cation and an anion. The cation contains a carbonyl group and a partial structure comprising: a carbon atom; a nitrogen atom N1 bonded via a single bond to the carbon atom; and a nitrogen atom N2 bonded via a double bond to the carbon atom. The polymerizable compound contains a polyiso(thio)cyanate compound and a polythiol compound.

A bio-electrode composition contains (A) an ionic polymer material, (B) an addition reaction-curable silicone having at least a hydrosilyl group, (C) a platinum-group catalyst, and a solvent. The bio-electrode composition has a water content of 0.2 mass % or less. The solvent includes one or more of an ether solvent, an ester solvent, and a ketone solvent each of which does not contain a hydroxy group, a carboxyl group, a nitrogen atom, or a thiol group. Thus, present invention provides: a bio-electrode composition capable of forming a living body contact layer for a bio-electrode which is excellent in electric conductivity and biocompatibility, light-weight, and manufacturable at low cost, and which does not leave residue on skin after attachment to and peeling from the skin; a bio-electrode including a living body contact layer formed of the bio-electrode composition; and a method for manufacturing the bio-electrode.

The invention relates to an electroplated coating protective agent and a preparation method thereof, and belongs to the technical field of electroplated coating protective agents, and the protective agent comprises the following raw materials: main salt, auxiliary salt, a composite complexing agent, 1-docosanethiol, a sealing agent, absolute ethyl alcohol and deionized water. The succinic acid, the N-sodium lauroyl sarcosinate and the citrazinic acid are used as the composite complexing agent, and starting from different aspects of activating the surface of the coating, accelerating the growth of the protective film layer and increasing the compactness of the protective film layer, the prepared protective agent can effectively improve the corrosion resistance effect of the coating; and the added 1-docosanethiol is used for reducing the defect area of the protective film layer and further effectively improving the corrosion resistance of the protective film. Besides, chromic nitrate is used as a main salt, cerous sulfate and sodium molybdate are used as auxiliary salts, and sodium silicate is used as a sealing agent, so that the prepared protective agent can effectively have remarkable salt spray resistance, and meanwhile, the appearance quality of a formed film layer can also be improved.

There is provided a method of producing a hydrogel. A first polymer functionalized with a homocysteine thiolactone of formula I is reacted to open the ring and obtain a pendant thiol group, wherein any three of the R2 are H, and the remaining R2 is selected from H, C1-C4 branched or linear alkyl, methoxy, ethoxy, and halogen;. (I) The pendant thiol group of the first polymer are then crosslinked with a pendant vinyl group on a second polymer in the presence of a gel former to obtain the hydrogel.

Moulding material mixture of natural and / or ceramic sands with a phenol-formaldehyde resin-free binder for foundry moulding sands, wherein the binder is either ➢as a one-component binder based on polyurethane and / or polyurea, comprising an aromatic or aliphatic oligomeric and / or polymeric isocyanate or a mixture of several aromatic and / or aliphatic oligomeric and / or polymeric isocyanates with partially delayed reactivity, and as an additive a non-functional diluent, wherein the isocyanates consist entirely or partially of pre-crosslinked reaction products, and wherein the pre-crosslinking is brought about by the reaction with di- or polyfunctional polyols with a stoichiometric deficit of hydrogen-active compounds, resulting in a residual content of free isocyanate groups in the range of 5 to 35%, and wherein the one-component binder is suitable for a multi-phase curing process using water-alcohol mixtures, or ➢ as a two-component binder based on polyurethane and / or polyurea, comprising . a component A with an average hydrogen functionality of 2.0 to 3.9, with an average equivalent weight of 450 to 900 g / eq of the reactants and with functional and / or non-functional additives that control the reactivity, non-functional admixtures that promote processability and ensure stability, wherein the reactants of component A are polyether alcohol mixtures of hydroxyl and / or mercapto groups and / or internal nitrogen-containing individual components, wherein the hydrogen-active compounds of the mixture of component A • two- to eight-functional polyether alcohols obtained by anionic or cationic ring-opening polymerization of cyclic ethers and simultaneous addition of the resulting polyether chains to OH / NH starter molecules and / or • Polythiols resulting from the esterification reaction of 3-mercaptopropionic acid with two or more alcohols or which are hydrogen-active polysulfide polymers with free SH groups, are selected and combined, and • an isocyanate-containing component B is present.

The invention belongs to the technical field of synthesis and preparation of high-molecular optical materials, and particularly relates to a multi-mercaptothiol composition as well as a preparation method and application thereof. According to the present invention, the three-step synthesis route of the tetrahydroxymethylation reaction, the thiol precursor introduction and the deprotection is adopted, the reaction conditions are mild, the steps are clear, the yield is high, the complexity of the traditional synthesis route is avoided, the production cost is reduced, and the industrial production is easily achieved. In the aspect of refractive index regulation and control, the compound contains a plurality of sulfur atoms, the coating is endowed with the characteristic of high refractive index, accurate regulation of the refractive index can be realized by adjusting the formula of the composition, the requirements of different optical applications are met, and the application range of the material is widened. The prepared optical coating has excellent light transmittance, light loss can be reduced to the maximum extent, and the efficient performance of an optical device is ensured; meanwhile, the haze value of the coating is low, the light scattering phenomenon is effectively avoided, and the imaging definition and the precision of an optical system are guaranteed.

To provide a curable resin composition for flexible film coating capable of forming a cured film excellent in flexibility and scratch resistance.SOLUTION: The curable resin composition for flexible film coating according to an embodiment contains a urethane (meth)acrylate and a tetrafunctional thiol compound. The urethane (meth)acrylate is a reaction product of a raw material containing: a pentaerythritol (meth)acrylate having a hydroxyl value of 150-240 mg KOH / g; and an aliphatic polyisocyanate.SELECTED DRAWING: None