452 results about "Acetal" patented technology

The invention provides a bio-based 1, 4-butanediol composition and a preparation method thereof, and polyester prepared from the bio-based 1, 4-butanediol composition, the bio-based 1, 4-butanediol composition comprises bio-based 1, 4-butanediol, an acidic compound, a nitrogen-containing compound and acetal; the content of acetal in the bio-based 1, 4-butanediol composition is less than or equal to 195ppm. According to the invention, polyester prepared by taking the bio-based 1, 4-butanediol composition as a raw material has a low color value and a low melt index.

The invention discloses a method for synthesizing methylal through acetalation by using a strongly acidic composite metal oxide, and particularly relates to preparation of a strongly acidic composite metal oxide catalyst and a method for preparing methylal through condensation of methanol and formaldehyde by using the strongly acidic composite metal oxide catalyst. The preparation method comprises the following steps: preparing a ZrO2-SiO2 composite oxide precursor by adopting a coprecipitation method, dipping and loading active metal and an auxiliary agent on the composite oxide precursor, and applying the active metal and the auxiliary agent to a process of preparing methylal through acetalation. The method has the advantages of simple synthesis, no corrosion to equipment, mild reaction conditions, capability of improving the activity and stability of the catalyst, and the like.

The invention relates to the technical field of ink, and discloses a preparation method of bio-based degradable water-based ink, which comprises the following steps: carrying out esterification polymerization on vanillin-based spiro acetal diglycidyl ether and diacid to obtain bio-based polyester resin, mixing and dispersing the bio-based polyester resin, petroleum-based resin, pigment, auxiliary agent and the like to obtain the bio-based degradable water-based ink. The bio-based degradable water-based ink is prepared. The bio-based resin contains a plurality of hydrophilic hydroxyl groups, has good solubility and dispersibility in the water-based ink, and generates denser hydrogen bonds and other cross-linking effects with the acrylic resin, so that the hardness of the ink is improved. Meanwhile, the polar hydroxyl groups also greatly enhance the hydrogen bond bonding and anchoring effect between the paint film and the base material, so that the adhesive force is improved. In addition, easily-hydrolyzed spiral acetal bonds, polyester structural units and other degradable chemical bonds in molecular chains of the bio-based resin provide more attack sites for water and microorganisms, the degradation rate is increased, and the degradable function is achieved.

The invention discloses a degradable armed acetal epoxy monomer and a preparation method thereof, the acetal epoxy monomer has the following molecular structure general formula: # imgabs0 #, in the formula, R1, R2, R3 and R4 are independently selected from one of hydrogen, methoxyl and ethyoxyl. The degradable acetal epoxy monomer is prepared through the aldol condensation reaction, the thermosetting epoxy resin prepared from the epoxy monomer and the curing agent can be rapidly degraded under the normal-pressure, mild and specific conditions, and huge economic and environmental advantages are achieved for recycling and reusing of the thermosetting resin. When the prepared degradable epoxy resin is used in thermosetting epoxy resin, under the degradation condition provided by the invention, a thermosetting epoxy resin matrix is degraded into alcohol and aldehyde with relatively small molecular weight, the mixture can be dissolved in an organic solvent, and a degradation product can be extracted through simple separation, so that the purpose of recovering the resin is achieved.

The invention provides electronic atomized liquid and a preparation method thereof.The electronic atomized liquid comprises organic acid neotame salt, the organic acid neotame salt is dissolved in the electronic atomized liquid to release neotame, and the mass fraction of the neotame in the electronic atomized liquid is larger than 0% and smaller than or equal to 0.2% based on the total mass of the electronic atomized liquid; the electronic atomized liquid comprises at least one of fatty aldehyde acetal and a pH regulator, the mass fraction of the fatty aldehyde acetal is 0%-1% based on the total mass of the electronic atomized liquid, and the pH regulator is used for regulating the pH of the electronic atomized liquid to be 2.5-6.0. According to the embodiment of the invention, the neotame is released by using the organic acid neotame salt, the fatty aldehyde acetal is used for replacing the corresponding fatty aldehyde substance, the pH value of the electronic atomized liquid is adjusted to be acidic, and the three stabilizers are combined or combined in pairs for synergism, so that the stability of the neotame in the electronic atomized liquid is effectively improved.

The invention discloses a water-soluble bornyl ester compound and application thereof, the structure of the water-soluble bornyl ester compound is as shown in general formula I, R is acetic acid 2-oxoethyl ester of organic heterocyclic ring, amino acid 2-oxoethyl ester, glycolate of amino acid, acetal of monodisperse polyethylene glycol chain, carbonate, ester or glycosyl; the compound is good in water solubility, the problems that borneol is difficult to dissolve in water and difficult to prepare can be well solved, and in an inflammatory depression animal model, the bornyl ester compound shows good anti-inflammatory, anti-depression and cerebral apoplexy treatment effects and has great application prospects.

The invention discloses a preparation method and application of a controllable depolymerization and debonding high-performance epoxy adhesive. The preparation method comprises the following steps: S1, reacting an aldehyde monomer with an alcohol monomer to obtain a polyhydroxy intermediate containing an acetal structure; the aldehyde monomer has at least one hydroxyl functional group; the alcohol monomer has more than three hydroxyl functional groups; s2, carrying out ring-opening addition and alkaline environment ring-closing epoxidation reaction on epoxy chloropropane and the polyhydroxy intermediate to obtain an epoxy monomer containing an acetal dynamic bond; and S3, compounding the epoxy monomer obtained in the step S2 with a temperature-resistant epoxy monomer, and mixing and curing with an amine curing agent to obtain the controllable depolymerization debonding thermosetting adhesive under the acidic condition, the temperature-resistant epoxy monomer comprises at least one of an epoxy monomer containing a naphthalene ring structure and an epoxy monomer containing a biphenyl structure.

The present invention relates to an acetalate of an ethylene-vinyl alcohol copolymer, the acetalate comprising 20-80 mol% of ethylene units and 4-76 mol% of vinyl alcohol units based on the total monomer units constituting the acetalate, the acetalate having a degree of acetalation of 3-80 mol%, and satisfies formula (1): 0.71 < = W0.05 h / 2f < = 1.09 (W0.05 h / 2f represents a symmetry coefficient determined by reversed phase partition gradient high performance liquid chromatography based on a water-ethanol eluent in accordance with JIS K 0124: 2011) and formula (2): 1.20 < = Tm / Tg < = 1.35 (Tm and Tg respectively represent a melting peak temperature (K) and an intermediate point glass transition temperature (K) measured in accordance with JIS K7121: 2012), and the oxygen permeation rate at 20 DEG C and 65% RH is 150 cc.20 [mu] m / m2. Day. Atm or less.

The invention discloses a controllable debonding thermosetting adhesive, a preparation method of the controllable debonding thermosetting adhesive and application of the controllable debonding thermosetting adhesive in bonding and disassembling of composite materials. The preparation method comprises the following steps: S1, reacting an aldehyde monomer with an alcohol monomer to obtain a polyhydroxy intermediate containing an acetal structure; the aldehyde monomer has at least one hydroxyl functional group; the alcohol monomer has more than three hydroxyl functional groups; s2, carrying out ring-opening addition and alkaline environment ring-closing epoxidation reaction on epoxy chloropropane and the polyhydroxy intermediate to obtain an epoxy monomer containing an acetal dynamic bond; and S3, mixing and curing the epoxy monomer obtained in the step S2 and an amine curing agent to obtain the controllable debonding thermosetting adhesive under the acidic condition. The thermosetting adhesive disclosed by the invention is high in initial bonding strength and quick in debonding under an acidic condition. A composite material joint bonded by using the thermosetting adhesive disclosed by the invention is high in bonding strength and convenient to disassemble and recycle.

The invention provides a high-strength and high-thermal-plastic-temperature polysiloxane polyurea thermoplastic elastomer containing dynamic acetal amine bonds and a preparation method of the high-strength and high-thermal-plastic-temperature polysiloxane polyurea thermoplastic elastomer. According to the invention, the diisocyanate and macromolecular polydimethylsiloxane copolymer is used as a soft segment, the diisocyanate and 1, 3-bis (3-aminopropyl) tetramethyldisiloxane copolymer is used as a hard segment, and the polyhydroxy compound containing dynamic acetal amine bonds is used as a cross-linking agent, so that the prepared elastomer has good mechanical properties and high thermal plasticizing temperature, and can be used for preparing the polyurethane elastomer. Repeated processing can be realized; the preparation process is simple and feasible, and the product has stable performance and good reproducibility and is suitable for popularization and application.

The invention relates to the technical field of benzamide, in particular to a preparation process of 4-hydroxythiobenzamide, which comprises the following steps: S1, preparing raw materials: preparing the 4-hydroxythiobenzamide from the following raw materials in parts by weight: 80-100 parts of formic acid, 80-100 parts of hydrochloric acid, 20-30 parts of 4-hydroxybenzaldehyde, 8-12 parts of hydroxylamine hydrochloride, 8-12 parts of thioacetamide and 4-6 parts of sodium hydroxide. According to the preparation method, after 4-hydroxybenzaldehyde is subjected to activating treatment reaction, part of positive charges on aldehyde carbon are dispersed, oxygen atoms in an acetal structure are connected with the aldehyde carbon through covalent bonds to generate an electron withdrawing induction effect, the reaction sequence and the reaction path of the 4-hydroxybenzaldehyde can be controlled through aldehyde activation, and the reaction efficiency of the 4-hydroxybenzaldehyde is improved. Therefore, the generation of byproducts is reduced, and the purity of a reaction product obtained from 4-hydroxybenzaldehyde is improved.

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.

The invention discloses a fluorine release film for a high-viscosity silica gel protective film of an AF glass screen and a preparation method of the fluorine release film, and belongs to the technical field of unsaturated polyester, raw materials are uniformly mixed and coated on a PET base material, during high-temperature heat preservation, part of double bonds on a modified release agent and a modified filler can react with silicon-hydrogen bonds on hydrogen-containing silicone oil under the action of chloroplatinic acid, so that the fluorine release film is formed. The modified filler and the modified release agent are grafted by residual double bonds on the modified filler and the modified release agent under the action of 2, 4, 6-trimethylbenzoyl-diphenyl phosphine oxide through ultraviolet irradiation, so that the modified filler is more thoroughly contacted with polymer molecules, a stable conductive grid can be formed during raw material curing, and the conductivity of the conductive grid is improved. Meanwhile, under the action of triphenyl sulfonium hexafluorophosphate, an expanding monomer DB-TOSU is subjected to double-ring-opening polymerization to form bicyclic acetal, the bicyclic acetal is converted into carbonyl and hydroxyl, and the carbonyl and hydroxyl are matched with a polyhedral oligomeric silsesquioxane structure on the modified filler, so that the smoothness of the surface of the release film is ensured.

The invention relates to the technical field of plasmalogen, and discloses a preparation method and application of an amide plasmalogen compound, and the preparation method comprises the following steps: (1) reacting a compound 1 and a compound 2 in an HEPES buffer solution to obtain a compound 3; (2) reacting the compound 3 in an ethyl acetate phase and a water phase by using phospholipase D under the assistance of Ca < 2 + > ions to obtain a compound 4; (3) expression and purification of CarF protein from myxobacteria; and (4) reacting the compound 4 and CarF protein in a Tris-HCl buffer solution under the assistance of NADH (Nicotinamide Adenine Dinucleotide) and catalase to obtain a compound 5. According to the invention, the purified recombinant myxobacteria CarF protein and the chemically synthesized CarF protein reaction substrate are adopted to finally synthesize the amide plasmalogen, and the amide plasmalogen can show the effect similar to that of natural plasmalogen.

Derivatives of sabinene, and more particularly to sabinene carboxaldehyde and its derivatives described herein, as well as their synthesis and use in organoleptic applications is provided. The sabinene derivatives include a compound having a general Formula (1): wherein: • R 1 is selected from the group consisting of acetals, monothioacetals, (CH=CR 2) X(CHR) mOR 3, (CH=CR 2) X(CHR) nCHO, (CH = CR 2) X(CHR) pCN; and (CH = CR 2) X(CHR) qCO 2R 4; each R is independently selected from the group consisting of H or methyl;R is selected from the group consisting of H, methyl, and ethyl; • R 3 is selected from the group consisting of H, C1-C3 aliphatics, and C(O)R, where R 2 is H or ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, isopentyl, neopentyl, cyclopentyl, hexyl, isohexyl, neohexyl, or cyclohexyl; • R 4 is selected from the group consisting of C1-C3 alkyls; x is an integer equal to 0 or 1; and m, n, p, and q are integers independently selected from 0 to 7, with a proviso that when R and R 3 are each H, then x and m are not both equal to 0.

The invention belongs to the technical field of epoxy resin, and provides degradable epoxy resin containing a cyclic acetal structure and a preparation method and application thereof.The epoxy resin is based on alicyclic epoxy resin, the cyclic acetal structure is introduced into the alicyclic epoxy resin structure, the cyclic acetal structure has degradability under the acidic condition, and therefore the cyclic acetal structure can be degraded under the acidic condition; the rigidity of the annular structure is favorable for improving the mechanical property of the epoxy resin, and the finally obtained epoxy resin has the characteristics of good mechanical property, ultraviolet radiation resistance and suitability for the field of photocuring. According to the preparation method provided by the invention, 3-cyclohexene-1-formaldehyde and tetrahydric alcohol are taken as raw materials, and the epoxy resin is obtained through nucleophilic addition reaction and epoxidation reaction.

To provide an acid generator, a resist composition and the like which allow a resist pattern having good line edge roughness to be produced.SOLUTION: The acid generator contains a salt represented by formula (I), and the resist composition contains the acid generator. [In the formula, Q1, Q2, R1 and R2 each represent an H atom, an F atom or the like; z represents an integer of 0-6; X1 and X2 each represent -CO-O-, -O-CO- or the like; L1 and L2 each represent a single bond or a substituted / unsubstituted hydrocarbon group; W1 represents a cyclic hydrocarbon group; X represents a halogen atom or a haloalkyl group; R3 and R4 each represent a halogen atom, a haloalkyl group or the like; R5 represents a hydrogen atom or a group forming an acetal structure or the like; m3 and m4 represent integers of 0-3, m5 represents an integer of 0-4, and m6 represents 2 or 3; Z+ represents an organic cation; L10 represents a single bond or an alkanediyl group; Raa1 and Raa2 each represent an H atom or a hydrocarbon group; Xa represents a single bond, an O atom or the like; Raa3 represents a hydrocarbon group; and m51 and m52 each represent 0 or 1.]SELECTED DRAWING: None

The invention discloses a method for synthesizing polyvinyl acetal with high acetalization rate by using acid with catalytic property and dispersity, and relates to the technical field of synthetic resin. The method comprises the following steps: dissolving polyvinyl alcohol in water to obtain a polyvinyl alcohol solution; adding a p-toluenesulfonic acid solution into the polyvinyl alcohol solution, then adding an aldehyde compound at the temperature of 25-30 DEG C, and after the aldehyde compound is added, continuing to react at the temperature of 25-30 DEG C to obtain the high-acetalization-rate polyvinyl acetal. According to the invention, p-toluenesulfonic acid is used as an acid catalyst and a dispersant at the same time, and preparation of the high-acetalization-rate polyvinyl acetal is realized under the condition of not adding any other surfactant or organic dispersant. The method not only realizes the preparation of the high-acetalization-rate polyvinyl acetal product, but also has the advantages of low preparation cost, simplicity in product separation and purification, recyclability of p-toluenesulfonic acid and the like.

The present invention relates to oriented, multilayer polyethylene films. In one aspect, a biaxially oriented, multilayer polyethylene film comprises: at least one inner layer comprising: (1) a polyethylene-based composition that comprises: (a) at least 97% by weight, based on the total weight of the polyethylene-based composition, of one or more polyethylenes having a density between 0.926 g / cm3 to 0.970 g / cm3 and a melt index (I2) between 0.1 to 10 g / 10 min; (b) 20 to 5000 ppm, based on the total weight of the polyethylene-based composition of a sorbitol acetal derivative comprising the structure of formula (I): wherein R1-R5 comprise the same or different moieties chosen from hydrogen and a C1-C3 alkyl.

This invention relates to the field of polymer material synthesis technology, specifically to a modified PVB resin and its preparation method. The invention introduces a fluorinated acetal monoaldehyde derivative containing fluorine into the PVB resin. This derivative is mixed with n-butyraldehyde and glyoxal, thereby undergoing an acetalization reaction with the 1,3-o-diol structure of the PVB molecular chain, incorporating the fluorinated side link into the PVB molecular chain. Utilizing the high electronegativity and high C-F bond energy of fluorine atoms, it shields against the intrusion of external corrosive media, inhibits oxidative yellowing, and improves weather resistance. Furthermore, the invention introduces glyoxal as a crosslinking agent, containing dialdehyde groups, which can react between adjacent polyvinyl alcohol segments, causing slight crosslinking between the originally linear PVB resin segments, improving the resin's shielding performance, further reducing the intrusion of external corrosive media, and enhancing the stability of the PVB resin.

The invention is directed to a process for the preparation of an aromatic acid or a phenolic compound, said process comprising reacting a dienophile and a furanic compound comprising an acetal moiety in a Diels-Alders reaction to obtain an aromatic compound comprising said acetal moiety, followed by hydrolysis and oxidation of said acetal moiety into a hydroxide or carboxylate moiety to form the aromatic acid or phenolic compound, wherein said dienophile is selected from the group consisting of alkylenes, acetylenes, acrylates, maleates, fumarates, maleimides, propiolates, acetylene dicarboxylates, and benzynes and wherein said acetal moiety is bound directly to the 2-position of the furanic compound.

The present application relates to the technical field of electrochromic, and more particularly to a high-hydroxyl polyvinyl acetal flame-retardant interlayer for electrochromic soundproof glass, and a preparation method thereof.The preparation process comprises the following steps: adding polyvinyl butyral with low acetalization degree into N,N-dimethylformamide, heating and stirring to dissolve, then adding plasticizer and electrolyte salt in sequence, heating and stirring to dissolve, pouring into a mold, vacuumizing to remove bubbles, and heating to remove solvent, thereby obtaining the flame-retardant interlayer.The present application solves the problems of liquid leakage, easy volatilization and safety hazards of the existing liquid reversible metal electrodeposition electrochromic device.

To provide means to produce glycolaldehyde dialkyl acetal in high yield.SOLUTION: A production method includes a glycolaldehyde formation step of converting paraformaldehyde to glycolaldehyde in an ether type solvent in the presence of an N-heterocyclic carbene catalyst, and an acetalization step of treating the glycolaldehyde with an alcohol solution of hydrogen chloride to obtain glycolaldehyde dialkyl acetal. The glycolaldehyde formation step and the acetalization step are performed in a single container.SELECTED DRAWING: None

This invention provides a polynuclear metal cluster based on salicylaldehyde acetal-2-thiophenol ligand, its preparation method, and its application. The chemical formula of the polynuclear metal cluster is Co4(C 13 H9NOS)6·2CH3CN·CH3OH, where C 13 H9NOS is salicylaldehyde acetal-2-thiophenol, with Co forming a six-coordinate octahedral configuration with N, O, and S. The salicylaldehyde acetal-2-thiophenol ligand in the polynuclear metal cluster of this invention can effectively stabilize the active center of metallic cobalt, resulting in a polynuclear metal cluster with significant OER activity and broad prospects for practical applications.

This invention discloses a quantitative method for phospholipids, comprising: a sample preparation step, wherein a sample containing protein and phospholipids is mixed with Schiff reagent to obtain a sample for testing; a control sample preparation step, wherein the sample is mixed with a solvent of Schiff reagent to obtain a control sample; a measurement step, wherein the degree of a first optical property of the sample for testing and the degree of an optical property of the control sample are measured after the reaction of the aldehyde formed by the vinyl ether bond of phospholipids with Schiff reagent; and a determination step, wherein a correction degree obtained by correcting the degree of the first optical property using the degree of the optical property of the control sample is compared with the degree of a second optical property of the standard sample to determine the concentration of phospholipids in the sample, wherein the standard sample contains Schiff reagent and phospholipids of known concentration, and the degree of the second optical property is the degree of reaction of the Schiff reagent with the aldehyde formed by the vinyl ether bond of phospholipids.

The invention provides a synthesis method of 1-methyl-L-histidine, which comprises the following steps: firstly, carrying out methylation reaction on a compound 1 and N, N-dimethylformamide dimethyl acetal to obtain a compound 3; the compound 3 and NCS are subjected to a chlorination reaction, and a compound 4 is obtained; then reacting the compound 4 with diethyl acetamidomalonate to obtain a compound 5; then carrying out hydrolysis decarboxylation on the compound 5 to obtain a compound 6; and finally, splitting the compound 6 by using acetyl hydrolase to obtain a chiral compound 7 (namely 1-methyl-L-histidine). The synthesis route is short, the raw materials are cheap, the production cost can be reduced, the product yield and purity are high, and large-scale industrial production is facilitated.

The invention discloses a cellulose-based dispersing agent, a preparation method of the cellulose-based dispersing agent and application of the cellulose-based dispersing agent in preparation of large-size graphene. The cellulose-based dispersing agent is an acetal compound generated by reaction of cellulose and aromatic aldehyde. Wherein the number-average molecular weight of the cellulose is greater than 8000. The large-size graphene is prepared by mixing the cellulose-based dispersing agent and the graphite liquid phase and then performing mechanical stripping, the process is easy to control, efficient and easy to operate, and the large-size, high-quality and high-yield graphene can be industrially produced.

The invention belongs to the technical field of wine brewing, and relates to a detection method for simultaneously analyzing the content of acetaldehyde and acetal in fermented grains and application, the detection method comprises the following steps: uniformly mixing the fermented grains and rice husks, using an ethanol solution as a distillation reagent for distillation, and carrying out condensation reflux to obtain a distillate; adding a saturated sodium chloride solution into the distillate, feeding a sample, and detecting and calculating through a headspace-gas chromatograph-mass spectrometer to obtain the content of acetaldehyde and acetal in the fermented grain distillate. The addition ratio of the fermented grains to the ethanol solution is 1g: (2-8) mL; the concentration of the ethanol solution is 5-35%. An ethanol solution is used as a distillation reagent to distill and extract acetaldehyde and acetal in the fermented grains, and then detection and calculation are performed through a headspace-gas chromatograph-mass spectrometer to obtain the content of acetaldehyde and acetal in the fermented grains, which is equivalent to other detection methods to improve the content and accuracy of acetaldehyde and acetal detection in the fermented grains.