Abstract: Disclosed by the present invention are an aqueous polyurethane functional mask substrate and an application thereof. Two kinds of water-based polyurethane dispersions are used as the main components of the mask substrate. The transdermal penetration and absorption of functional ingredients such as whitening, moisturizing and anti-aging ingredients in facial mask products are promoted by means of the special cross-linked structures of polyurethane films. During use, a mask is evenly applied to the face; and after the mask dries, the entire mask may be removed directly or removed after being moistened using water. The mask substrate according to the present invention is also applicable to body masks such as a hand mask, a neck mask and a back mask.

Abstract: A method for preparing an isocyanate in a gaseous phase by feeding, in the presence or absence of an inert gas, an amine-containing gas stream and a phosgene-containing gas stream into a reaction region, allowing the amine and the phosgene to contact in gaseous forms and undergo a phosgenation reaction in the reaction region, thus preparing the target isocyanate in a gaseous form in the reaction region. The phosgene-containing stream is subjected to preheating and warming before being fed into the reaction region, and the phosgene-containing stream comprises a substance A at a mass fraction of <1% before being subjected to the preheating and warming up. Substance A is a NCO group-containing substance and/or an olefinic double bond-containing substance. The method reduces the formation of clogging matter in a heat exchanger and a vessel during the preheating and warming of the phosgene and during the reaction process.

Abstract: An ionic aqueous epoxy curing agent, a preparation method therefor and the use thereof. The aqueous epoxy curing agent is prepared by reacting the following raw materials in parts by weight: a) 1 part of a polyepoxy compound, b) 1.3-6 parts of a multifunctional compound, c) 0.2 to 1.25 parts of a monoepoxy compound, and d) 0.01 to 0.23 parts of a sultone, wherein the multifunctional compound has four or more active hydrogens. The curing agent obtained has a good hydrophilic effect and very good thinning performance, the paint film prepared by mixing same with an epoxy dispersion has the following advantages: excellent salt spray resistance and water resistance, strong adhesion, high hardness, etc.; in addition, the preparation process of the curing agent is simple, the conditions are mild, and room temperature curing is carried out.

Abstract: Provided in the invention are a catalyst for preparing phosgene and a preparation method therefor, and a method for the preparation of phosgene and the comprehensive utilization of energy thereof. The preparation method comprises the following steps: 1) stirring and soaking activated carbon in a modifying solution, then adding dimethyltin dichloride and chromium oxide powders and carrying out a reaction, and then adding a nickel oxide fine powder and ultrasonically oscillating same to prepare a pre-modified activated carbon; 2) drying the pre-modified activated carbon; and 3) heating and calcinating the dried pre-modified activated carbon from step 2) to prepare the catalyst.

Abstract: A preparation method for an emulsifier, an emulsifier, an aqueous epoxy resin dispersion, and a formulation method. The preparation method for an emulsifier comprises reacting aminosulfonic acid and/or a sulfamate as a first reaction raw material with an epoxy resin in the presence of water, so as to obtain an ionic active emulsifier. The ionic active emulsifier molecule comprises at least one epoxy group from an epoxy resin and at least one sulfonic acid or sulfonate group from the first reaction raw material. The aqueous epoxy resin dispersion prepared by using the emulsifier has the characteristics of good stability and good corrosion resistance after curing, and can be used in the fields of coatings, adhesives, etc.

Abstract: Disclosed by the present invention is a method for preparing a reactive sealant resin, the method comprising: (1) under the action of an alkali catalyst, polymerizing a hydroxyl-containing initiator with an epoxy compound to obtain a polyether polyol; (2) adding an alkoxide reagent and a halogenated end-capping agent containing a double bond to the polyether polyol obtained in step (1) for reaction, so as to obtain a crude double-bonded polyether product, and refining the crude product to obtain a modified polyether product; and (3) subjecting the modified polyether and hydrogen-containing silane to silane end-capping reaction under the action of a hydrosilylation catalyst, so as to obtain the target product, i.e., a reactive sealant resin. The resin has excellent properties as well as good adhesion and paintability.

Abstract: The present invention relates to a composite catalyst, preparation process thereof, and process for catalyzing the trimerization of butadiene using the composite catalyst. The composite catalyst comprises: (A) a titanium compound catalyst active component, (B) an organometallic compound co-catalyst component, (C) a sulfoxide compound catalyst-modifying component, (D) a monoester compound catalyst-modifying component, and (E) a solvent component. The composite catalyst has advantages of excellent selectivity, high catalytic activity, easy preparation and so on.

Abstract: The invention relates to a method of circular use of waste brine produced in the manufacture process of MDI, comprising the following steps: (1) the waste brine produced in the manufacture process of MDI is subjected to a high-gravity extraction and then to a column extraction, wherein said waste brine contains aniline, diaminodiphenylmethane and polyamine; (2) the waste brine from step (1) is transmitted to a stripping tower for steam stripping; (3) the waste brine from the stripping tower of step (2) and a chemical oxidant are transmitted to an oxidation reactor to which air is blown for aeration; (4) the waste brine after the treatment of step (3) is transmitted to an absorption tower for absorption. The invention makes the salt water have TOC of less than 8 ppm and TN of less than 2.5 ppm and achieves regeneration of resources in the waste brine such as sodium chloride and water and the like for circular use.

Abstract: The present invention discloses a viscoelastic sound-absorbing polyurethane foam and a method for preparing the same, the foam being prepared by reacting a polyisocyanate composition and an isocyanate reactive component. The isocyanate reactive component comprises, based on the weight of mixed polyethers, 30-80 wt % of (bii) a copolyol of epoxypropane-epoxyethane, or a conjugate thereof, wherein the content of oxy-ethylidene unit is 5-35 wt %; 2-20 wt % of (biii) a copolyol of epoxypropane-epoxyethane, or a conjugate thereof, wherein the content of oxy-ethylidene unit is 70-100 wt %; and 20-70 wt % of (biv) a copolyol of epoxypropane-epoxyethane, or a conjugate thereof, wherein the content of oxy-ethylidene unit is 0-20 wt %. The sound-absorbing foam of the present invention has a ball rebound rate of 15-30% and good sound absorption performance.

Abstract: The present invention relates to a method for preparing TDI (toluene diisocyanate) isocyanurate by using TDI, monohydric alcohol, solvent, antioxidant, catalyst and termination agent as the raw materials. The properties of the isocyanurate are improved by the process comprising the modification by monohydric alcohol and addition of the catalyst and solvent in several stages at an appropriate temperature. By adding the catalyst and solvent in batches at the condition of controlling both NCO % and the viscosity in the preparation process, and adjusting the solid content at each step, the resulting TDI isocyanurate has low content of free TDI, high xylene tolerance, small product color number, and high performance stability, which makes the product obtained by the isocyanurate have good application properties such as the drying, polishing and extinction properties of coating film, and such isocyanurate has good compatibility with other components.

Abstract: The present invention relates to a method for preparing catalyst used for preparing chlorine by oxidizing hydrogen chloride. The method is mixing a slurry mainly containing boron and chromium with a slurry mainly containing copper, boron, alkali-metal elements, rare-earth elements, aluminum sol, silica sol, carrier and optionally other metal elements, the mixing temperature being not more than 100° C., and the residence time being not more than 120 minutes, the mixed slurry is successively treated with spray drying, high temperature calcination, so that the catalyst is obtained. The present invention also relates to the catalyst prepared through the method, use of the catalyst used in the process of preparing chlorine by oxidizing hydrogen chloride and a method for preparing chlorine by using the catalyst. The catalyst is used for preparing chlorine by oxidizing hydrogen chloride with oxygen or air in fluidized bed reactor.

Abstract: A polyisocyanate modified with sulphamic acid and a mixture thereof, the preparation method thereof, and the use thereof in the production of polyurethane, especially as a cross-linking ingredient in the field of aqueous coatings and adhesives containing groups that are capable of reacting with isocyanate groups.

Abstract: The present invention relates to a catalyst for preparing phosgene and a method for preparing phosgene using the catalyst. Said method comprises: modifying the surface of an activated carbon coating/foamed silicon carbide structural catalyst using an alkali metal salt; filling the catalysts having different thickness of the activated carbon coating and different amount of the alkali metal salt in different sections in the axial direction of the multi-tubular reactor of the fixed bed, and preparing phosgene using Cl2 and CO. The radial and axial temperature difference of the catalyst bed is lowered by using the alkali metal salt-modified activated carbon coating/foamed silicon carbide structural catalyst and by segmental filling, so that high temperature of tube wall is obtained in the case of a larger tube diameter, and high quality of steam is obtained stably.

Abstract: The present invention relates to a method for preparing branched polycarbonate with a continuous two-phase interface phosgene method. Firstly, an aqueous solution of alkali metal hydroxide with triphenol and polyphenol dissolved therein reacts with a certain amount of phosgene in the present of inert organic solvent to prepare a prepolymer, and then a coupling reaction is performed among the prepolymer, an aqueous solution of alkali metal hydroxide with bisphenol and phosgene dissolved therein to finally obtain a polycarbonate resin. The method can avoid a cross-linking reaction, reduce the cost and improve the quality of the product, while improving the conversion ratio of the branching agent and the branching degree of the product.

Abstract: The present invention relates to a process for preparing isocyanate homopolymers containing uretdione groups, in which the phosphinoboron compound of formula (I) are used as catalysts to catalyze the homopolymerization reaction of raw isocyanates, thereby obtaining a solution of isocyanate homopolymers having uretdione groups, then separating the solution and thus obtaining the isocyanate homopolymers containing uretdione groups. The isocyanate homopolymers containing uretdione groups prepared by this process have a high amount of the uretdione groups, wherein the dependence of the amount on the conversion rate of raw isocyanates is significantly ameliorated, with low chromaticities.

Abstract: The present invention relates to a catalyst for preparing phosgene and a method for preparing phosgene using the catalyst. Said method comprises: modifying the surface of an activated carbon coating/foamed silicon carbide structural catalyst using an alkali metal salt; filling the catalysts having different thickness of the activated carbon coating and different amount of the alkali metal salt in different sections in the axial direction of the multi-tubular reactor of the fixed bed, and preparing phosgene using Cl2 and CO. The radial and axial temperature difference of the catalyst bed is lowered by using the alkali metal salt-modified activated carbon coating/foamed silicon carbide structural catalyst and by segmental filling, so that high temperature of tube wall is obtained in the case of a larger tube diameter, and high quality of steam is obtained stably.

Abstract: Disclosed is a method for preparing diamino-dicyclohexyl methane (H12MDA) by hydrogenation of diamino-diphenyl methane (MDA). In the process, 4,4?-MDA used as the starting material is firstly hydrogenated to prepare 4,4?-H12MDA. When the activity of the catalyst is reduced, the feed is switched from 4,4?-MDA to the mixture of 2,4?-MDA and 4,4?-MDA, and then when the conversion is stabilized, the feed is switched to 4,4?-MDA again. The deactivated catalyst is activated on line by switching the feed to the mixture of 2,4?-MDA and 4,4?-MDA. 4,4?-H12MDA having the trans-trans isomer content of 16˜24 wt % is produced, and the mixture of 2,4?-H12MDA and 4,4?-H12MDA is also produced, wherein the content of 2,4?-H12MDA in the mixture is 4˜15 wt %.

Abstract: The present invention provides a method for preparing 3-aminomethyl-3,5,5-trimethyl cyclohexylamine. The method comprises: a) reacting 3-cyano-3,5,5-trimethyl cyclohexanone with excess primary amine as well as removing the water generated from the reaction, so that IPN is substantially converted into imine compounds; b) in the presence of an ammonolysis catalyst, mixing the product of step a) with liquid ammonia, making the imine compound perform ammonolysis reaction to generate 3-cyano-3,5,5-trimethyl cyclohexylimine and the primary amine; and c) in the presence of hydrogen and a hydrogenation catalyst, hydrogenating 3-cyano-3,5,5-trimethyl cyclohexylimine obtained in step b) to obtain 3-aminomethyl-3,5,5-trimethyl cyclohexylamine. The method of the present invention avoids the generation of 3,5,5-trimethyl cyclohexanol and 3-aminomethyl-3,5,5-trimethyl cyclohexanol as the major by-products in the prior art, thereby improving the yield of 3-aminomethyl-3,5,5-trimethyl cyclohexylamine.

Abstract: The present invention discloses a viscoelastic sound-absorbing polyurethane foam and a method for preparing the same, the foam being prepared by reacting a polyisocyanate composition and an isocyanate reactive component. The isocyanate reactive component comprises, based on the weight of mixed polyethers, 30-80 wt % of (bii) a copolyol of epoxypropane-epoxyethane, or a conjugate thereof, wherein the content of oxy-ethylidene unit is 5-35 wt %; 2-20 wt % of (biii) a copolyol of epoxypropane-epoxyethane, or a conjugate thereof, wherein the content of oxy-ethylidene unit is 70-100 wt %; and 20-70 wt % of (biv) a copolyol of epoxypropane-epoxyethane, or a conjugate thereof, wherein the content of oxy-ethylidene unit is 0-20 wt %. The sound-absorbing foam of the present invention has a ball rebound rate of 15-30% and good sound absorption performance.

Abstract: A process of producing chlorine gas by catalytic oxidation of hydrogen chloride including: incorporating an oxidizing agent such as ozone, hydrogen peroxide solution etc.