90 results about "Hydroxy compound" patented technology

The invention discloses foamed 3D printing elastomer photosensitive resin and a preparation method, and relates to the technical field of additive manufacturing materials. The thermal-expansion polyurethane acrylate composite material is prepared from the following materials in parts: 400 to 700 parts of a polyurethane acrylate oligomer containing dynamic oxime ester bonds and acrylate groups, 200 to 500 parts of a reactive diluent, 50 to 200 parts of thermal-expansion microspheres, 10 to 50 parts of a photoinitiator and 1 to 50 parts of a stability auxiliary agent, the polyurethane acrylate oligomer containing the dynamic oxime ester bond and the acrylate group is prepared by reacting isocyanate, polyol, a compound containing oxime hydroxyl and an acrylate end-capping reagent. According to the 3D printing elastomer photosensitive resin and the preparation method thereof, by introducing dynamic oxime ester bonds, controllable foaming of the material in the heat treatment process is achieved, the technical bottleneck that traditional light-cured resin is large in foaming difficulty is broken through, the material is endowed with the excellent lightweight characteristic through design, good mechanical performance and heat stability are kept, and the 3D printing elastomer photosensitive resin is suitable for 3D printing. The high requirement on the material performance is met.

A polishing liquid for CMP, the polishing liquid containing abrasive grains, a nitrogen-containing compound, and water, in which the abrasive grains include cerium-based particles, and the nitrogen-containing compound includes a compound A1 having a fused ring (a fused ring having an aromatic five-membered ring with one nitrogen atom), a compound A2 having a quinoline ring and one hydroxy group bonded to the quinoline ring, a compound A3 having an aromatic ring and a hydroxy group bonded to a nitrogen atom, or a compound A4 having a nitrogen-containing aromatic ring to which at least one selected from the group consisting of a hydroxy group and an amino group is bonded.

A process for the production of a C6-18 alkyl ester of 4-aminobenzoic acid of formula (I), wherein the process comprises the step of reacting the 4-aminobenzoic acid of formula (II) with an hydroxy compound of formula (III) in the presence of a catalyst to generate a C6-18 alkyl ester of 4-aminobenzoic acid of formula (I) wherein R is a C6-18 alkyl group; and wherein the catalyst is a titanium catalyst, preferably a titanium alkoxide catalyst.

The present invention provides a method (600a) and apparatus for producing an alkaline mixture comprising sodium silicate, which mixture is suitable for use as an alkaline activator for alkaline activated and geopolymer cements, but which may also be used, for example, to mineralize captured carbon dioxide. The method comprises comminuting (301) an ore of a target metal into fines, wherein the ore comprises a siliceous mineral and at least one of iron and manganese as the target metal. The siliceous mineral may comprise the target metal itself and / or it may be silica and / or another silicate mineral present as gangue. The ore is dehydrated and hydroxylated compounds contained therein are dehydroxylated (302). The ore thus treated is then reacted (601) in an inert atmosphere with an amount of liquid sodium in excess of the stoichiometric amount thereof required for a redox reaction between the liquid sodium and an oxide of the target metal from the ore, to precipitate out from the liquid sodium a solid phase comprising both the target metal in elemental form and other insoluble products comprising sodium oxide. The redox reaction is conducted at a temperature of at least 320 °Celsius to induce a reaction between the sodium oxide and silica derived from the siliceous mineral to produce sodium silicate, but also below a temperature at which the liquid sodium can react with the oxide of the target metal to produce a ternary oxide thereof. At least some of the liquid sodium having sodium silicate dissolved therein is then separated (305) from the solid phase and is reacted (602) with at least one of oxygen and water to produce a mixture comprising sodium silicate and at least one of sodium oxide and sodium hydroxide. The corresponding apparatus comprises a comminution device (such as a rock crusher or grinder), means for dehydrating and dehydroxylating the ore (such as a dryer), a gas-tight first reaction vessel for reacting the ore thus treated with the liquid sodium, a solid-liquid sodium phase separator, and a second reaction vessel for reacting the liquid sodium having sodium silicate dissolved therein with at least one of oxygen and water. The resulting alkaline mixture is therefore produced whilst extracting the target metal in elemental form from its ore. Thus the energy consumed is split between the production of these two co-products, making the method of the invention a low-energy method of producing an alkaline activator for alkaline activated and geopolymer cements. Both reactions (601, 602) are also significantly exothermic and at least some of the thermal energy from them may be recycled. The invention does not consume any carbon and is therefore at least carbon-neutral. On the other hand, it consumes the silica content of gangue mineral species and / or of siliceous minerals of the target metal in its ore, which have previously been treated as waste products. The amount of waste material produced when extracting the target metal from its ore is thereby reduced as well.

The invention belongs to the technical field of polymer synthesis, and discloses polyether as well as a preparation method and application thereof. The polyether has a structural general formula as shown in formula (I), n is an integer of 2-200, and R1 and R2 are the same or different organic groups. The preparation method comprises the following step: in an inert or air atmosphere, carrying out polymerization reaction on a binary alkyne aldehyde compound and a binary hydroxyl compound in an organic solvent to obtain the polyether. According to the invention, the alkyne aldehyde monomer is designed and synthesized, and the high reaction activity of the monomer enables the monomer to be polymerized with a hydroxyl compound under the condition of no metal catalysis. The method is simple and efficient, and the polymer with high molecular weight and good thermal stability can be synthesized. The obtained polyether contains an aldehyde group side chain, so that selective detection and high-sensitivity detection of hydrazine are realized; and the structure and the function of the polymer can be expanded through a post-modification way. Formula (I)

Aqueous treatment compositions for crude oil and / or petroleum distillates to remove sulfur compounds therefrom and treatment methods using such compositions are disclosed. The composition has less than 0.5% wt / wt di- or tri-benzohydroxy compound, a strong base, less than 1% wt / wt divalent metal gluconate, a balance of water, and a pH that is 9 or greater. The treatment method includes adding said treatment composition to crude oil or a petroleum distillate to form a mixture having 0.001% to 0.02% wt di- or tri-benzohydroxy compound / wt oil and 0.001% to 0.03% wt divalent metal gluconate / wt oil and mixing the same together.

The present disclosure provides methods for recovering reactive diluent components from 3D printed crosslinked polymeric materials. The reactive diluent components can be recovered either as hydroxyl-containing compounds cleaved from pendant ester groups attached to the polymer backbone, or as (meth)acrylate monomers by cleavage of the polymer backbone itself. The recovered hydroxyl-containing compounds and (meth)acrylate monomers can be reused for the fabrication of new medical devices by 3D printing.

The invention discloses a preparation method and application of an in-situ copolymerized PIM-pillararene composite membrane, a tetrahydroxy-containing compound and a tetrafluoro-containing compound are used as reaction monomers, a precursor matrix is synthesized by adjusting the proportion of the tetrafluoro-containing compound, and then a mixed matrix polymer is obtained by in-situ doping of polyhydroxy pillararene. Dissolving a polymer in an organic solvent to obtain a membrane casting solution; and coating a solvent-resistant substrate with the membrane casting solution, and drying in a drying oven to obtain the composite membrane with high separation performance. Fluorine groups in a PIM matrix and hydroxyl groups on cyclic polyhydroxy aromatic hydrocarbon molecules are subjected to chemical cross-linking reaction to enhance the porosity of the polymer and increase the specific surface area, and column aromatic rings are introduced to promote adsorption of guest molecules, so that rich high-performance transmission channels are formed. On the basis of PIM synthesis, a polyhydroxy pillar arene compound is further introduced, the membrane stability can be improved through a rich net structure, and the separation performance of common organic solvents is remarkably improved.

The invention discloses a foamed thermoplastic polyurethane insole and a preparation method thereof. The raw material composition of the foamed thermoplastic polyurethane shoe insole comprises thermoplastic polyurethane, the raw material composition of the thermoplastic polyurethane contains or does not contain a cross-linking agent, and when the raw material composition of the thermoplastic polyurethane does not contain the cross-linking agent, the raw material composition of the foamed thermoplastic polyurethane shoe insole further comprises the cross-linking agent; the cross-linking agent comprises one or more than two of polyisocyanate, a polyhydroxy compound and a polyamino compound; the polyisocyanate contains at least three isocyanate groups; the polyhydroxy compound contains at least three hydroxyl groups; the polyamino compound contains at least three amino groups. The preparation method can adopt a small blank foaming process. When the cross-linking agent is used for preparing the foamed thermoplastic polyurethane shoe midsole by a small blank foaming process, the shrinkage of a shoe wall during hot pressing can be prevented, and one or more than two properties of tensile strength, elongation at break and layered tearing strength of the foamed thermoplastic polyurethane shoe midsole can be improved.

The present invention relates to the technical field of concrete materials. Disclosed are a modified epoxy resin and a preparation method therefor, a composition for an epoxy resin grouting material, an epoxy resin grouting material, a preparation method therefor, and a use thereof. The method for preparing the modified epoxy resin comprises: heating a polyhydroxy compound and an epoxy resin at 80-100ºC in a nitrogen atmosphere in the presence of a catalyst to obtain the modified epoxy resin, wherein the molar ratio of the polyhydroxy compound, the epoxy resin, and the catalyst is 1:1-2:0.05-0.1; the epoxy resin is a bisphenol A epoxy resin; the catalyst is selected from any one of sodium hydroxide, potassium carbonate, and dimethylaniline; and the polyhydroxy compound is selected from at least one of glycerol, ethylene glycol, propylene glycol, glucose, and butylene glycol. The epoxy resin grouting material of the present invention has more excellent toughness and lower viscosity, and good bonding strength and bonding durability with a concrete matrix.

The application relates to the field of polyurethane foaming materials, and discloses a low-VOC polyurethane foaming compound and a preparation method thereof; the low-VOC polyurethane foaming compound comprises A component and B component which are mutually packed, the A component comprises low-aldehyde polyether polyol, polyether carbonate polyol, functionalized polyurethane oligomeric polyol, reactive tertiary amine catalyst, foam stabilizer and water, and the B component comprises a low-free-monomer isocyanate component; the functionalized polyurethane oligomeric polyol is prepared by reacting polyether carbonate polyol, diisocyanate and a hydroxyl compound containing a 1,3-dicarbonyl structure and having two or more hydroxyl groups. The preparation method comprises the steps of functionalized polyurethane oligomeric polyol preparation, A component dispensing, B component dispensing and packing. By introducing the reactive oligomeric polyol with the 1,3-dicarbonyl structure into the foaming system, the volatile components brought by raw materials can be reduced, and the continuous control ability of aldehyde components in the foaming process and the post-maturation process can be improved.

The invention discloses capacitor carbon, which is characterized in that the specific surface area of the capacitor carbon is 1400-2500 m < 2 > / g, and the tap density of the capacitor carbon is 0.35-0.51 g / cm < 3 >. The preparation method of the capacitor carbon comprises the following steps: (1) uniformly mixing a first carbon source, a polyhydroxy compound and a transition metal compound, and activating; (2) removing an activating agent from the activated material; and (3) carrying out heat treatment on the material obtained in the step (2), washing and drying to obtain the capacitor carbon. The invention provides high-tap-density capacitor carbon and a preparation method thereof. The super-capacitor carbon with high tap density and excellent cycle performance is obtained. The problem that in the prior art, a carbon electrode material for an energy storage device is not large enough in tap density is solved.

The application discloses a borate-based polyurethane and a preparation method thereof, a renewable polyurethane material containing the borate-based polyurethane and application of the borate-based polyurethane, and a processable and renewable polyurethane with excellent hydrolysis / thermal stability is prepared. Due to the boron-nitrogen bidentate coordination in the borate compound M and the synergistic effect of the imine bond and the borate group, the renewable polyurethane material containing the borate group has high stability to thermal stimulation, water or a hydroxyl-containing compound, and the application range of the renewable polyurethane material is widened. The obtained renewable polyurethane material can be completely repaired and recycled under relatively mild conditions, so that an environment-friendly polymer material is obtained, the renewable polyurethane material is a re-upgrade of traditional polymers, and the continuous generation of plastic waste can be expected to be alleviated and curbed.

This invention relates to a diamine chain extender for two-component polyurethane resins, wherein R1 is a characteristic structural unit of a diol, R2 is a characteristic structural unit of a diisocyanate, and R3 is a characteristic structural unit of a dihydrazide. This invention also discloses a method for preparing the diamine chain extender for two-component polyurethane resins. The beneficial effect of this invention is that, based on the high reactivity of isocyanates, a simple and efficient "one-pot two-step" synthetic route is designed. First, a prepolymer with terminal isocyanate groups is generated by reacting a dihydroxy compound with excess diisocyanate. This intermediate has a well-defined structure and high reactivity. Subsequently, the active amino groups at both ends of the dihydrazide molecule react with the terminal isocyanate groups of the prepolymer, achieving chain extension and amino group capping in one step, ultimately generating a highly symmetrical target diamine chain extender. This method avoids the use of hazardous raw materials, has mild reaction conditions, and provides an ideal chain extender choice for the preparation of high-performance polymers.

The application discloses a preparation method of a multi-grafted comb copolymer, and the obtained product and application. Firstly, an elastomer is functionalized, and an acid anhydride group, a carboxyl group, an epoxy group and the like are introduced into an elastomer molecular chain, then a hydroxyl-terminated compound or an amine group-terminated compound is reacted with the functionalized elastomer to obtain a multi-grafted comb copolymer, and the copolymer is further compounded with a plasticizer, an oil substance, a coupling agent and a petroleum resin to obtain a direct-throwing high-viscosity asphalt modifier. The modifier has good road performance, can form a stable and uniform network structure with an asphalt matrix, the modified asphalt adopting the modifier can not only maintain excellent 60 DEG C dynamic viscosity, but also can significantly improve storage stability, and is expected to reduce a construction temperature and realize green and environment-friendly construction.

An object of the present invention is to provide an epoxy resin composition that can be preferably used for prepreg and fiber reinforced composite material applications wherein the epoxy resin composition includes components [A] to [C] and satisfies conditions (1) to (3):[A]: epoxy resin[B]: polyamine curing agent, and[C]: a compound having a boiling point of 130° C. or more, a molecular weight of 50 to 250, no epoxy groups and substantially no ability to cure an epoxy resin,wherein(1): at least a portion of [C] has two or more alcoholic hydroxyl groups in the molecule,(2): the ratio C / E of moles E of epoxy groups of [A] to the moles C of [C] satisfies condition (1) is 0.01 or more and 0.20 or less, and(3): the viscosity of the composition at 70° C. for 2 hours is 5.0 times or less the initial viscosity at 70° C.

The invention relates to a water activity regulator as well as a preparation method and application thereof. The preparation method of the water activity regulator comprises the following steps: (1) mixing 2-acrylamide-2-methylpropanesulfonic acid, sodium p-styrenesulfonate, N-vinylpyrrolidone and polyether amine, and adding an initiator for polymerization reaction to obtain a polyether amine-sulfonic acid group-benzene ring copolymer; and (2) mixing the polyether amine-sulfonic acid group-benzene ring copolymer with a hydroxyl compound to obtain the water activity regulator. By adding the water activity regulator disclosed by the invention, the retention rate of apparent viscosity and plastic viscosity of the prepared sample adding slurry after aging is high, and the API filter loss is low.

The invention belongs to the field of functional materials, and discloses polyether with acid-base responsiveness as well as a preparation method and application thereof. The preparation method of the polyether with the acid-base responsiveness comprises the following steps: 1, in an inert or air atmosphere, under the action of a nonmetal base catalyst, carrying out polymerization reaction on an alkyne aldehyde compound and a hydroxyl compound in an organic solvent, and after the reaction is finished, carrying out post-treatment to obtain polyether as shown in a formula (II); and step 2, in an air atmosphere, reacting the polyether as shown in the formula (II) with hydrazine or a hydrazide compound in an organic solvent to obtain a solution of the polyether with acid-base responsiveness as shown in the formula (I). The polyether with acid-base responsiveness is prepared by utilizing the polymerization method disclosed by the invention, and high-tech application of the polyether in the aspects of patterning, copying materials, logic gates, information encryption and the like is realized by utilizing the excellent properties of quick acid-base response, obvious fluorescence change, good reversibility and the like of the polyether. Formula (I); formula (II)

The application belongs to the technical field of packing bags, and particularly relates to a high-barrier sealed waterproof multilayer food packing bag and a preparation method thereof. The multilayer food packing bag comprises an antibacterial inner layer, a barrier intermediate layer and a waterproof outer layer. The antibacterial inner layer comprises polyethylene and chitosan intercalated double-hydroxyl compound coated titanium dioxide modified aramid pulp at a mass ratio of 10-15:1. The barrier intermediate layer comprises ethylene-vinyl alcohol copolymer, ethylene-vinyl acetate copolymer and mustard acid modified nano silicon dioxide at a mass ratio of 86-93:5-10:2-4. The waterproof outer layer comprises polypropylene. The packing bag provided by the application has excellent antibacterial, anti-puncture, barrier and waterproof functions, can be used as an inner bag of a food packing bag, and can be used for food transportation and storage to improve the shelf life of food.

The present application relates to the technical field of flame-retardant modifier, in particular to a multi-valence phosphorus-containing modifier, a preparation method and application thereof, the preparation method comprises the following steps: S1, mixing a phosphorus-containing acidic compound with a phosphorus-containing hydroxyl compound, and performing a phosphate esterification reaction to obtain a phosphate esterification product; S2, mixing the phosphate esterification product with a solvent, and then adding a nitrogen-containing compound to perform a salting reaction, thereby obtaining the multi-valence phosphorus-containing modifier; the valence states of phosphorus elements in the phosphorus-containing acidic compound and the phosphorus-containing hydroxyl compound are different. The present application adopts a plurality of valence phosphorus-containing compounds, and the different valence phosphorus-containing compounds have different flame-retardant mechanisms. Integrating phosphorus elements with different valence states into the same molecular structure realizes the synergistic effect of gas-phase and condensed-phase flame retardation, significantly improves the flame-retardant efficiency, solves the migration problem of traditional flame retardants, and overcomes the defect of low flame-retardant efficiency.

The application discloses a kind of corrosion-resistant conductive materials and preparation method thereof.Corrosion-resistant conductive material is with SiO2 and platinum or gold as main component a kind of new material.The material utilizes ammonia, acetic acid as catalyst, tetraethyl orthosilicate (TEOS) as SiO2 source, glycerol as anti-cracking agent, platinum or gold powder as conductor material.Catalysis using ammonia makes the solubility of silicon-hydroxyl compound increase, then two-step catalysis using acetic acid makes silicon-hydroxyl compound polymerize into colloidal particles.Add glycerol as anti-cracking agent to the prepared colloid, add appropriate amount of micron-sized platinum or gold powder, stir and mix uniformly.The prepared colloid is spin-coated on different substrates such as silicon wafer, and heat treatment is carried out using a rapid annealing furnace, to prepare a new type of corrosion-resistant conductive material.The method is simple, has very good plasticity, has oxidation resistance, corrosion resistance to strong acid and salt water, can work in seawater for a long time, the resistance does not change, and the adjustable range of resistivity is very large.

The present invention provides an antistatic resin composition, primarily composed of ionomer, with improved abrasion resistance. [Solution] An antistatic resin composition comprising a potassium ionomer (I) and a polyvalent hydroxy compound (II) that satisfies the following conditions: a copolymer (P) containing structural units (A) derived from ethylene and / or α-olefins having 3 to 20 carbon atoms and structural units (B) derived from monomers having carboxyl groups and / or dicarboxylic acid anhydride groups as essential constituent units, wherein at least a portion of the carboxyl groups and / or dicarboxylic acid anhydride groups in the copolymer (P) are converted to potassium ion-containing carboxylate salts, the proportion of the structural units (B) converted to potassium ion-containing carboxylate salts in the copolymer (P) is 1.5 mol% or more, and the phase angle δ at the absolute value of the complex modulus of elasticity G* = 0.1 MPa measured by a rotational rheometer is 50 to 75 degrees.

This invention provides a C4-oxyglycoside tetracycline compound and its synthetic method. The structural formula of the C4-oxyglycoside tetracycline compound is as follows: where R1 is hydrogen or methyl; R2 is hydrogen, halogen, or dimethylamino; R3, R4, R5, R6, and R7 are hydrogen or alkoxy groups. The synthetic method of the C4-oxyglycoside tetracycline compound includes the synthesis of a C4-(S)-hydroxy compound and the synthesis of a C4-oxyglycoside compound. This invention is the first to realize a method for the chiral inversion of the C4 hydroxyl group and the synthesis of C4-oxyglycoside tetracycline. This method is simple, efficient, widely applicable, and easy to scale up for production.

This invention relates to a high-temperature resistant, room-temperature curing anti-corrosion coating and its preparation method. The high-temperature resistant, room-temperature curing anti-corrosion coating includes component A and component B. Component A includes epoxy resin, small molecule hydroxyl compounds, additives, and inorganic fillers. Component B includes a curing agent. The epoxy resin includes phenolic epoxy resin, which includes various phenolic epoxy resins with different viscosity gradients. The coating of this invention, by using phenolic epoxy resins with different viscosity gradients, can improve the adhesion between the coating and oil pipeline materials, and also improves the resistance to different temperatures and humidity levels. It has strong adhesion to oil pipelines, is easy to apply, and possesses a variety of excellent properties such as high solids content, impermeability, corrosion resistance, high temperature resistance, and thermal stress resistance. It can be applied in harsh environments such as alternating high and low temperatures, alternating dry and wet conditions, alternating strong acids and alkalis, and high abrasion, and is suitable for long-term corrosion protection of oil pipelines.

Provided is a method for recycling a waste resin composition containing a synthetic resin and organic impurities.　A production method according to the present invention is for producing a dihydroxy compound from a waste resin composition, and includes: a step (a1) for treating an alkaline solution, which comprises a waste resin composition including a resin having at least two structural units selected from the group consisting of general formulas 1-4, a ketone-based solvent, and water, to obtain a reaction solution which comprises a mixture of dihydroxy compounds including a first dihydroxy compound selected from the group consisting of the general formulas 1'-4' and at least one other dihydroxy compound selected from the group consisting of said general formulas 1'-4', and a ketone-based solvent; and a step (b1) for crystallizing the first dihydroxy compound from a crystallization solution obtained by adding an alcohol-based solvent to the reaction solution.

Provided are a cyclophosphazene reactive flame retardant containing a benzocyclobutene group, and a preparation method therefor and the use thereof. In the molecular structural formula of the provided cyclophosphazene reactive flame retardant containing a benzocyclobutene group, at least one benzocyclobutene group is comprised on the phosphazene ring. The provided preparation method for the cyclophosphazene reactive flame retardant containing a benzocyclobutene group comprises: reacting a hydroxyl compound at least containing a hydroxyl BCB derivative with a halogenated cyclophosphazene under the action of an acid-binding agent, and purifying the product, so as to obtain a cyclophosphazene reactive flame retardant containing a benzocyclobutene group. Provided is a resin composition, to which the cyclophosphazene reactive flame retardant containing a benzocyclobutene group is applied; and in addition to the cyclophosphazene reactive flame retardant containing a benzocyclobutene group, the resin composition comprises at least one of an unsaturated monomer, an unsaturated resin, a benzocyclobutene monomer and a benzocyclobutene resin, which are polymerized under certain conditions so as to form a bulk flame retardant material. In the flame retardant material, nitrogen and phosphorus are synergistically flame retardant. The flame retardant material does not contain a polar group, has a low DK and Df, and has a high Tg, such that the flame retardant material is applied to a high-frequency and high-speed copper-clad laminate material.

The invention provides a halogen-free phosphorus flame retardant as well as a preparation method and application thereof, and belongs to the technical field of flame retardants. The preparation method comprises the following steps: mixing a hydroxyl-containing compound, an acid-binding agent and an organic solvent to obtain a mixed solution; dropwise adding pyrophosphoryl chloride into the mixed solution, and reacting to obtain a reaction product; and carrying out post-treatment on the reaction product to obtain the halogen-free phosphorus flame retardant. The hydroxyl-containing compound comprises one or more of epoxy butanol, glycidol, syringaldehyde, vanillin and p-hydroxybenzaldehyde. The halogen-free phosphorus-based flame retardant disclosed by the invention is a flame retardant with a new structure and has an epoxy group capable of participating in a co-curing reaction of epoxy resin; the preparation method of the flame retardant is simple, the flame retardant is prepared from hydroxyl-containing compounds such as glycidol and pyrophosphoryl chloride under the action of an organic solvent and an acid-binding agent through a one-step synthesis method, and a target object can be conveniently and rapidly prepared.

The invention provides a 260 DEG C superhigh temperature resistant modified fatty acid oil-based drilling fluid wetting agent as well as a preparation method and application thereof, and belongs to the field of oilfield chemistry in the petroleum industry. The preparation method of the wetting agent comprises the following steps: mixing ricinoleic acid and a base material fatty acid, carrying out dehydration treatment, adding a solid superacid catalyst I, and adding polyol for reaction; after the reaction is finished, filtering to obtain modified fatty acid; carrying out dehydration treatment on the obtained modified fatty acid, adding a solid superacid catalyst II, adding a grafting reagent containing an epoxy group, and carrying out ring-opening grafting reaction; then adding a polyhydroxy compound, and carrying out esterification cross-linking reaction; adding a high-temperature stabilizing aid into the obtained reaction liquid, and carrying out curing treatment; and cooling the obtained filtrate, adding an oil-phase dispersion medium, and uniformly stirring to obtain the oil-phase dispersion medium. The wetting agent provided by the invention can reduce the oil-solid interfacial tension and improve the wettability of the oil-based drilling fluid to drilling cuttings, well wall rocks and weighting materials.

A system and method for removing acetaldehyde from an acetic acid system, including providing a solution from the acetic acid system, the stream having methyl iodide and acetaldehyde, distilling the solution to produce an overhead stream having a higher concentration of acetaldehyde, contacting the overhead stream, and optionally a hydroxyl compound, with an acid catalyst to convert the acetaldehyde to an aldehyde derivative having a higher boiling point than acetaldehyde.

The invention discloses a two-component polyurethane elastic adhesive and a preparation method thereof, and belongs to the field of polyurethane adhesives. The adhesive comprises a component A and a component B, wherein the component A comprises hydroxyl-terminated polybutadiene, polyester or polyether polyol, a micromolecular hydroxyl compound, a chain extender, an antioxidant, a catalyst, a first filler, a first water removal agent and a pigment; the component B comprises an isocyanate-terminated polyurethane prepolymer, first isocyanate, a second dewatering agent, a second filler, a coupling agent and a thixotropic agent; and the isocyanate-terminated polyurethane prepolymer in the component B is prepared from hydroxyl-terminated polybutadiene or polyester polyol and isocyanate. The component A and the component B are uniformly mixed according to the volume ratio of 1: 1 for use. The adhesive has the advantages of wide adhesion base materials, favorable elasticity, excellent low-temperature resistance, excellent aging resistance, excellent heat sensitivity and favorable resistance to heat, damp heat and water.