314 results about "Formate Esters" patented technology

The invention provides an electrolytic hydrogen production device and an operation method thereof. The electrolytic hydrogen production device comprises a proton exchange membrane flow battery, a first proton exchange membrane electrolytic bath, a second proton exchange membrane electrolytic bath, a positive electrode electrolyte water tank, a negative electrode electrolyte water tank, a methanol storage tank and a control switching device, the proton exchange membrane flow battery is used for performing reversible redox reaction on the positive electrode electrolyte and the negative electrode electrolyte to realize charging and discharging; an anode chamber of the first proton exchange membrane electrolytic cell is used for carrying out oxidation reaction on methanol to obtain methyl formate and hydrogen ions; a cathode chamber of the second proton exchange membrane electrolytic cell is used for reducing hydrogen ions to obtain hydrogen; the positive electrode electrolyte water tank is used for carrying out oxidation-reduction reaction on the positive electrode electrolyte and realizing circulation; the negative electrode electrolyte water tank is used for carrying out oxidation-reduction reaction on the negative electrode electrolyte and realizing circulation; the control switching device is used for controlling the operation mode of the device. The device is high in safety and volatility absorption capacity and large in energy storage capacity.

The invention belongs to the field of biological pharmacy and biological conversion, and particularly relates to a lipase mutant and application thereof. The lipase CALB mutant disclosed by the invention is obtained by carrying out single-point mutation or combined mutation on the 40th site, the 134 site, the 154 site, the 189th site, the 278th site and the 281 site of an amino acid sequence as shown in SEQ ID NO.1. Compared with a wild type, the mutant has the advantage that the stereoselectivity is greatly improved when the mutant is used for catalyzing racemization 3-cyclohexene-1-methyl formate to produce (S)-3-cyclohexene-1-formic acid. Compared with a traditional chemical method for preparing (S)-3-cyclohexene-1-formic acid, the lipase CALB mutant provided by the invention is high in stereoselectivity, mild in reaction condition, environment-friendly, low in equipment requirement, capable of greatly reducing the production cost and wide in application prospect in industrial application.

The present invention relates to the technical field of coatings and discloses a method for preparing an EVA waterproof coating. Activated montmorillonite reacts with toluene diisocyanate to obtain isocyanate-modified montmorillonite. EVA is hydrolyzed under the catalysis of potassium hydroxide to obtain hydroxylated EVA. An epoxy trisiloxane intermediate reacts with terephthalic acid under ring-opening esterification with benzyltriethylammonium chloride to obtain p-hydroxytrisiloxane benzoate. P-hydroxytrisiloxane benzoate, hydroxylated EVA, and isocyanate-modified montmorillonite are cross-linked with toluene diisocyanate under the catalysis of stannous octoate, and a defoamer and a dispersant are added thereto and stirred uniformly to obtain an EVA waterproof coating. The EVA waterproof coating prepared by the present invention has good mechanical properties and waterproof properties.

An active energy ray-curable inkjet printing ink composition satisfies requirements A to E below is provided: (A) the content of amine-modified oligomer is 1.0 to 20.0% by mass; (B) alkoxy group-containing (meth)acrylate monomers are contained by 2.0 to 20.0% by mass; (C) (meth)acrylate monomers having an alkyl group with 6 to 20 carbon atoms is contained by 2.0 to 25.0% by mass; (D) at least one type selected from the group that consists of 1,6-hexanediol diacrylate, 3-methyl-1,5-pentanediol diacrylate, dipropylene glycol diacrylate, 1,10-decanediol diacrylate, propoxylated(2)neopentyl glycol diacrylate, and hydroxypivalic acid neopentyl glycol diacrylate is contained by 30.0 to 60.0% by mass; (E) as photopolymerization initiators, ethoxy(2,4,6-trimethylbenzoyl)phenylphosphine oxide is contained by 3.0 to 15.0% by, and oligo(2-hydroxy-2-methyl-1-(4-(1-methylvinyl)phenyl)propanone) and / or 2-hydroxy-1-{4-[4-(2-hydroxy-2-methylpropionyl)phenoxy]phenyl}-2-methylpropanone is / are contained by 2.0 to 10.0% by mass, where the total content of photopolymerization initiators is 6.0 to 25.0% by mass.

The invention relates to the field of biomass energy and chemical industry, in particular to an efficient methanol preparation method based on biomass graded catalytic conversion and cycle coupling. The method comprises the following steps: in a graded catalytic oxidation reaction system, mixing a biomass raw material with a composite vanadium-based catalyst, water, oxygen and circulating methanol for reaction to generate a gas-liquid mixture containing methyl formate; recycling methyl formate by using a gradient variable-pressure rectification separation system; carrying out an interface hydrogenation reaction under the action of a copper-zinc-LTA hierarchical pore catalyst to generate methanol; finally, part of methanol is purified and recycled through membrane separation. The method realizes efficient conversion from biomass to methanol, has the advantages of mild reaction conditions, low energy consumption, high yield and good catalyst stability, and opens up a new path for industrialization of preparation of methanol from biomass.

The invention discloses a high-impact material prepared from recycled polypropylene and a preparation method of the high-impact material, and relates to the field of materials. When recycled polypropylene is used for preparing the high-impact material, firstly, polypropylene is grafted with vinyl diphenylphosphine, then the grafted polypropylene is reacted with 1-(3-chlorphenyl)-2-propyn-1-ol, and then the reacted polypropylene is reacted with 6-(methyl formate) pyridine-3-boric acid to obtain modified polypropylene; secondly, the calcium carbonate pretreated by 3-aminopropyltrimethoxysilane reacts with 3-thiophenecarboxaldehyde, thiophene, 6-(thiophene-2-yl) pyridine-2-carboxylic acid and 6-(3-thienyl) pyridine-2-formaldehyde are polymerized on the surface of the calcium carbonate, and modified calcium carbonate is obtained; and finally, carrying out melt blending on recycled polypropylene, modified polypropylene, modified calcium carbonate, sodium cyanide and bismaleimide, and carrying out extrusion granulation to obtain the high-impact material. The high-impact material prepared by the invention has good impact resistance, aging resistance and antibacterial property.

The present invention discloses a method for upgrading polyester materials to dicarboxylic acid esters and ethylene carbonate, and relates to the comprehensive utilization of waste resources and the cascade utilization of raw materials. The method uses multiple types of green ionic liquid catalysts to catalyze the methanolysis reaction of PET, and then dimethyl carbonate captures the generated ethylene glycol in situ, forms a five-membered cyclic ethylene carbonate through nucleophilic cyclization, pulls the reaction equilibrium to move forward, and completely depolymerizes PET waste. The products of the method of the present invention are dimethyl terephthalate and five-membered cyclic ethylene carbonate. The present invention can be used for the depolymerization and upgrading of waste PET materials, and can also be used for other similar polyesters, such as polyethylene succinate, polyethylene adipate and polyethylene 2,5-furan dicarboxylate, which are also suitable for the recovery strategy of the present invention, and the products are the corresponding dimethyl succinate, dimethyl adipate and 2,5-furan dicarboxylate.

Disclosed in the present invention are a branched-chain-containing long-carbon-chain polyester elastomer based on biomass-based 2,5-furandicarboxylic acid, and a preparation method therefor. Monomers for preparing the polyester elastomer comprise 2,5-furandicarboxylic acid or 2,5-furandicarboxylic acid ester, a dihydric alcohol and a branched-chain-containing long-carbon-chain dibasic acid. The preparation method comprises: (1) performing a melting reaction on furandicarboxylic acid or an ester thereof, a branched-chain-containing long-carbon-chain dibasic acid and a dihydric alcohol to prepare an oligomer; and (2) performing melt polycondensation on the oligomer to synthesize a furandicarboxylic acid-based branched-chain-containing long-carbon-chain polyester elastomer. By means of the branched-chain-containing long-carbon-chain polyester elastomer of the present invention, the molecular structure can be effectively designed, and the molecular weight can be regulated, thereby optimizing mechanical properties, thermal properties, barrier properties, etc. The preparation process thereof is simple, convenient and safe, and the equipment requirements and catalysis cost are relatively low. The raw material 2,5-furandicarboxylic acid used in the present invention is a potential substitute for terephthalic acid, is derived from biomass, has a wide range of sources and is environmentally friendly.

The invention relates to the technical field of water treatment, in particular to a nanofiltration membrane and a preparation method thereof. The preparation method comprises the following steps: soaking a base membrane in a water phase solution, taking out the base membrane, performing surface drying, coating the base membrane with an oil phase solution, performing interfacial polymerization reaction, and curing to obtain the nanofiltration membrane, the water-phase solution comprises a polyamine monomer, a surfactant, an acid-binding agent and water; the acid binding agent is bicarbonate; the oil phase solution comprises an acyl chloride monomer, an organic solvent a and an organic solvent b; the organic solvent a is ethyl cyclohexane; the organic solvent b comprises at least one of methane chloride, monochloroethane, diethyl ether, methyl ethyl ether, dimethyl ether and methyl formate. The membrane flux is improved while the acid chemical cleaning resistance of the membrane is improved.

The invention discloses cyclohexene formate esterase, a mutant of cyclohexene formate esterase and application of cyclohexene formate esterase in production of (S)-3-cyclohexene-1-formic acid. According to the cyclohexene formate esterase and the mutant disclosed by the invention, 100-400g / L of racemic 3-cyclohexene-1-methyl formate can be split by taking wet thalli subjected to induced expression or crude enzyme liquid obtained by ultrasonically crushing the wet thalli as a catalyst, so that (S)-3-cyclohexene-1-formic acid with chemical purity and optical purity reaching 99% or above is synthesized. The enzyme activity of the cyclohexene formate esterase mutant provided by the invention is further improved, the reaction time and the catalyst dosage are obviously reduced compared with those of a substrate with the same catalysis concentration before mutation, the reaction condition is mild, the operation is relatively simple and convenient, and the cyclohexene formate esterase mutant has a very good industrial application prospect.

The invention provides a preparation method of a hydrogenated cycloolefin polymer, which comprises the following steps: reacting a cycloolefin polymer with hydrogen in the presence of a hydrogenation catalyst and a hydrogenation aid to obtain the hydrogenated cycloolefin polymer, the hydrogenation auxiliary agent is selected from one or more of aliphatic dibasic acid esters, phthalate esters and benzene polyacid esters. Compared with the prior art, in the presence of the hydrogenation catalyst and the hydrogenation auxiliary agent, the cycloolefin polymer and the hydrogen are subjected to hydrogenation reaction, and an induced dipole is induced in the adjacent cycloolefin polymer through the hydrogenation auxiliary agent molecule with an inherent dipole; the molecular attraction between the induced dipole and the inherent dipole destroys the entanglement of the original molecular chain, and the friction force between the cycloolefin polymer molecules is reduced, so that the viscosity between the polymers is reduced, and the mass transfer effect of the reaction is improved; meanwhile, intramolecular electron conjugation can be inhibited, double bonds in molecules in the hydrogenation process can be damaged more easily, the hydrogenation efficiency is improved, and then the production efficiency is improved.

To provide a mite repellent composition having an excellent mite repellent effect against house dust mites even after a long time has elapsed and also having excellent safety for humans and animals.SOLUTION: A mite repellent composition contains: (a) 1,8-cineol and / or 1,4-cineol; and (b) a perfume component, wherein the perfume component includes one or more kinds of perfume compounds having a logP value of 2.0 to 5.5. A blending ratio (a / b) of the component (a) to the perfume compound contained in component (b) is set to 5 to 100 on a mass basis. The perfume compound contained in the component (b) is at least one selected from the group consisting of ethyl cinnamate, allyl caproate, 3-methyl-5-phenyl-1-pentanol, citronellol, δ-dodecalactone, β-ionone, benzyl benzoate, linalyl acetate, geranyl acetate, tricyclodecenyl propionate, benzyl salicylate, limonene, and amyl salicylate.SELECTED DRAWING: None

The invention provides a preparation method of dicarbonyl cyclopentadienyl cobalt, which comprises the following steps: adding cobalt salt, a reducing agent, methyl formate and a catalyst into a high-pressure reaction kettle, keeping the reaction kettle in an inert gas atmosphere, and heating and stirring; cooling the high-pressure reaction kettle to room temperature, discharging gas, filtering reaction liquid, and putting filtrate into a normal-pressure reaction device in an inert gas atmosphere; and adding a cyclopentadiene monomer into the normal-pressure reaction device, carrying out heating reaction, filtering after the reaction is finished, and carrying out post-treatment on the obtained filtrate to obtain a dicarbonyl cyclopentadienyl cobalt crude product. The operation risk is reduced, the operation is simple, and the synthesis efficiency is high; cheap and easily available cobalt salt is used as a raw material, and a relatively cheap catalyst is used, so that the synthesis cost is low, and the method is suitable for industrial large-scale popularization and application.

Disclosed is a modified biopolymer having the formula A-XY wherein: (a) A is a starting material selected from the group consisting of a polysaccharide, a protein and a cellulose; (b) X is a first moiety bearing a functionality co-reactive with A; (c) Y is a second moiety covalently bound to X, capable of undergoing free radical polymerization and bearing at least two ethylenically unsaturated functional groups; (d) the starting material A and the first moiety X are linked covalently through linkages selected from the group consisting of an ester, an amide, a urethane, a urea, a sulfonate ester, a phosphate ester and an ether; and (e) a degree of substitution of the starting material A with the first moiety X is less than 0.5 but more than 0.1. Compositions including the modified biopolymer and methods for making them are also disclosed.

The invention discloses an application of nano titanium dioxide in degradation of volatile phthalic acid ester in air, which comprises the following steps: placing nano titanium dioxide in the air containing volatile phthalic acid ester, and carrying out adsorption and degradation reaction under the condition that the relative humidity of the air is 1-40%, a degradation product formed after the reaction is completed is removed through illumination treatment mineralization, and the nano titanium dioxide is recycled. The nano titanium dioxide is simple to synthesize, low in cost, capable of being synthesized in a large scale and recycled, and capable of adsorbing and hydrolyzing volatile phthalate in air and avoiding secondary release of pollutants, and meanwhile, degradation products of the phthalate occupy active sites on the surface of the titanium dioxide, so that the photocatalytic activity of the nano titanium dioxide is improved, and the service life of the nano titanium dioxide is prolonged. Titanium dioxide is used as one of typical semiconductor materials, and pollutants can be mineralized through illumination to recover active sites, so that the titanium dioxide can be recycled.

The invention relates to the technical field of catalyst materials and discloses a low-temperature catalyst for preparing methyl formate through methanol dehydrogenation as well as a preparation method and application of the low-temperature catalyst. The low-temperature catalyst comprises Cu nano-particles and a composite metal oxide attached outside the Cu nano-particles, the composite metal oxide comprises CaO and CeO2. When the low-temperature catalyst disclosed by the invention is used for catalyzing methanol dehydrogenation to prepare methyl formate, the reaction can be realized at a relatively low temperature, and the low-temperature catalyst has relatively high methyl formate selectivity.

The invention provides a process for synthesizing alpha-chloro-alpha-acetyl-gamma-butyrolactone and co-producing methyl formate from aminopyrimidine mother liquor and application of the process, and relates to the technical field of chlorination of alpha-acetyl-gamma-butyrolactone. The preparation method comprises the following steps: mixing aminopyrimidine mother liquor and alpha-acetyl-gamma-butyrolactone, carrying out chlorination reaction, and standing for layering to obtain an alpha-chloro-alpha-acetyl-gamma-butyrolactone layer and a water layer; and (b) adding methanol into the obtained water layer, and carrying out esterification reaction to obtain methyl formate. The method solves the technical problems that in the prior art, baking soda is consumed during chlorination of alpha-acetyl-gamma-butyrolactone, the cost of formic acid adopted in an esterification process is high, and sodium formate contained in the aminopyrimidine mother liquor is not recycled. The technical effects of eliminating the use of more expensive intermediate raw materials, namely baking soda and formic acid, recycling sodium formate in the aminopyrimidine mother liquor and co-producing and synthesizing methyl formate are achieved.

The invention discloses a method for preparing 4-methoxycarbonyl-2-methylthiophene-3-sulfonamide, comprising the following steps: 1. preparing a sodium disulfide solution for standby; 2. reacting 4-amino-5-methylthiophene-3-methyl formate with sodium nitrite to obtain a diazo solution for standby; 3. reacting sodium disulfide with the diazo solution prepared in step 2 to obtain 3,3'-disulfide-bis[4-methoxycarbonyl-2-methylthiophene]; 4. reacting 3,3'-disulfide-bis[4-methoxycarbonyl-2-methylthiophene] with sulfonyl chloride; 5. adding water to separate layers, and treating the organic layer with ammonia to obtain 4-methoxycarbonyl-2-methylthiophene-3-sulfonamide. The invention provides a new preparation route for 4-methoxycarbonyl-2-methylthiophene-3-sulfonamide, wherein sulfur dioxide or chlorine is not used in the preparation process, thereby improving operational safety, reducing environmental pressure, reducing production costs, and being suitable for industrial production.

The continuous production heat pump assisted integrated extractive distillation device is adopted to realize high-purity separation and recovery of the diethyl ether-methyl formate-n-pentane azeotrope, and separation is realized by utilizing the characteristic that the extraction agent has great influence on the relative volatility of the diethyl ether-methyl formate-n-pentane azeotrope. The purity of the separated diethyl ether, n-pentane and methyl formate reaches 99.9% or above, high-purity recycling of the extraction agent can be achieved, the separation cost is greatly reduced, and the method is low in energy consumption and flexible to operate.

Lipid composition comprising: (i) one or more cationic lipids, preferably cationically ionizable lipids, (ii) one or more phospholipids, and (iii) one or more statistical copolymers comprising repeating units of the following formula (I-a) and repeating units of formula (II-a) wherein R1 represents a hydrogen atom or a group selected from a C1-3 alkyl group, a cyclopropyl group, and a C3 alkenyl group; R2 represents a group selected from a saturated C4-40 hydrocarbyl group; an unsaturated C4-40 hydrocarbyl group having one or more carbon-carbon double and / or triple bonds; a saturated C4-40 heterohydrocarbyl group containing 1 to 5 divalent groups selected from ether, thioether, sulfone, sulfoxide, keto, ester, amide, carbamate and carbonate groups, and / or 1 to 5 fluorine atoms as substituents; and an unsaturated C4-40 heterohydrocarbyl group having one or more carbon-carbon double and / or triple bonds, and containing 1 to 5 divalent groups selected from ether, keto, ester, and carbonate groups and / or 1 to 5 fluorine atoms as substituents; and x and y independently represent 0 or 1.

The present invention discloses a furandicarboxylate bio-based crosslinkable elastomer and a preparation method thereof. The preparation method comprises: uniformly mixing furandicarboxylate or furandicarboxylate, a linear saturated dibasic acid or linear saturated dibasic acid ester, a linear unsaturated dibasic acid or linear unsaturated dibasic acid ester, and a diol; adding a catalyst and an antioxidant; heating the mixture to above 150°C; gradually heating the mixture under an inert atmosphere; and reacting the mixture at 150-190°C for 3-7 hours to obtain an intermediate product; stirring the intermediate product for a polycondensation reaction at a vacuum degree of 30-400 Pa and a temperature of 200-260°C for 3-8 hours to obtain a crude product; and dissolving, washing, and drying the crude product to obtain a finished product. The polyfurandicarboxylate bio-based elastomer prepared by the present invention has good mechanical properties and processing properties; and the composite material after crosslinking and filler reinforcement can greatly improve tensile strength, good resilience, low permanent deformation, and high tensile strength.

The present invention discloses a grease-balanced low-turbidity high-compatibility cosmetic composition, comprising: at least one cyclohexane derivative grease; at least one malate; at least one benzoate and at least one alkyl-modified polysiloxane. The beneficial effects of the present invention are: by using cyclohexane ethylhexyl ester as a bridge, the cyclohexane part is compatible with phenyl silicone oil and the ethylhexyl part is compatible with malate, and at the same time, phenyl silicone oil, cyclomethicone oil, malate and the oil secreted by the skin have relatively good compatibility, and finally cyclomethicone oil, phenyl silicone oil, malate and the oil on the surface of the skin form a comprehensive balance system, and the balance system adapts to different base makeup technologies for dry skin, oily skin and mixed skin by changing the amount of each component, and can maintain the excellent initial coating feeling and moisturizing feeling of the formula, and can maintain the excellent use feeling of the formula in the middle and late stages, and the composition enhances the stability of the oil phase, and can improve the emulsification stability when used in the formula.

The invention discloses a heterogeneous catalyst for preparing methyl formate through CO esterification and a preparation method and application of the heterogeneous catalyst, and belongs to the field of methyl formate synthesis. The heterogeneous catalyst comprises a palladium active component, an auxiliary agent and a carrier, the auxiliary agent is selected from La and / or Ce; the loading capacity of the palladium active component is 0.01-0.6% of the mass of the carrier; and the loading capacity of the auxiliary agent is 0.01-10% of the mass of the carrier. Compared with a catalyst auxiliary agent reported in the literature, the rare earth auxiliary agent disclosed by the invention can enhance the interaction between the precious metal and the carrier, effectively improve the utilization rate of the precious metal, reduce the dosage of the precious metal and the production cost of the catalyst, and remarkably improve the economical efficiency of the technology. The preparation method disclosed by the invention is simple in process, easy to realize large-scale amplification and excellent in catalyst performance, and can be applied to a production technology for preparing methyl formate through CO esterification.

The invention relates to the technical field of organic synthesis, and particularly provides a thiophene-containing tetraarylethene compound as well as a preparation method and application thereof. According to the invention, two phenyl groups of tetraphenylethylene are replaced by methyl formate thiophene groups, and the substituted tetraarylethylene compound has more remarkable photochromic and mechanochromic dual functions through the interaction of a specific substituent group at the position 2 of thiophene and a large conjugated group formed by four aromatic rings; and light-operated double-color display in a polymer mechanism can be realized. The mechanochromism of the compound does not depend on ultraviolet light, when the compound is subjected to mechanical force, the molecular accumulation mode and conjugate planarity are changed, and the color change can be directly observed by naked eyes. Different from traditional tetraphenyl ethylene force-induced discoloration recessive fluorescence change, the dominant color change can be used in the fields of visual stress monitoring, anti-counterfeiting marks, inkless writing materials, safe ink and the like in ultraviolet-free environments (such as indoor and closed spaces), and the application prospect is wide.

To provide a method, a perfuming composition and a perfumed consumer product for imparting long-lasting properties for standard perfumery raw materials which are too volatile or have a poor substantivity by themselves or which are only deposited in a small amount on the surface of the final application.SOLUTION: The present invention relates to compounds of formula (I) as properfume compounds. In particular, the present invention relates to a method of releasing a compound, namely, a carbonyl, a formate ester and / or an alcohol represented by specific formulas, by exposing the compound of formula (I) to an environment in which it is oxidized. Moreover, the present invention relates to a perfuming composition and a perfumed consumer product comprising at least one compound of formula (I).SELECTED DRAWING: None

The present invention relates to a sunscreen or daily care composition comprising(i) bis-ethylhexyloxyphenol methoxyphenyl triazine (bemotrizinol),(ii) 1-(4-(1,1-dimethylethyl)phenyl)-3-(4-methoxyphenyl)propane-1,3-dione (avobenzone), and(iii) titanium dioxide;wherein the sunscreen or daily care composition is free of the UV filters from the group consisting of 4,4′,4″-(1,3,5-triazin-2,4,6-triyltriimino)tris-benzoic acid-tris(2-ethylhexyl)ester (octyl triazone), hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate (INCI diethylamino hydroxybenzoyl hexyl benzoate), 2,2′-Methylenbis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol] (bisoctrizole), 3,3,5-Trimethylcyclohexyl 2-hydroxybenzoate (INCI Homosalate), (RS)-2-Ethylhexyl (2E)-3-(4-methoxyphenyl)prop-2-enoate (octinoxate), 2-ethylhexyl 2-cyano-3,3-diphenylprop-2-enoate (INCI octocrylene), and 2-hydroxy-4-methoxybenzophenone (oxybenzone).

The invention relates to the field of organic synthesis, in particular to a synthetic method of (2R, 4S)-N-BOC-4-hydroxypiperidine-2-methyl formate. The synthesis method of (2R, 4S)-N-BOC-4-hydroxypiperidine-2-methyl formate comprises the following steps: mixing a material A, a material B, potassium carbonate, sodium iodide and a solvent, and reacting to obtain a material C; mixing the material C, the material D, triethylamine and a solvent, and reacting to obtain a material E; mixing the material E, ammonia water and a solvent, and reacting to obtain a material F; and mixing the material F, di-tert-butyl dicarbonate, a palladium carbon catalyst and a solvent, and carrying out a reaction to obtain the (2R, 4S)-N-BOC-4-hydroxypiperidine-2-methyl formate. The process route is easy to operate and has no special dangerous reaction. Reaction materials are cheap and easy to obtain, and the prepared product is high in purity.

The present invention provides a blowing agent for producing extruded polystyrene foam having low lambda over time and low foam density. [Solution] The foaming agent comprises (a) a first co-foaming agent consisting of (a) about 50% to about 70% by weight of HFO and / or HFCO having three or four carbon atoms, (b) about 2% to about 15% by weight of methyl formate, (c) a second co-foaming agent consisting of about 20% to about 30% by weight of dimethyl ether, isobutane and combinations thereof, and (d) a third co-foaming agent consisting of about 2% to about 25% by weight of carbon dioxide, acetone and combinations thereof.

This polybutylene terephthalate resin composition contains: a polybutylene terephthalate resin (A) having a terminal carboxyl group content of 25 meq / kg or less; and a cyclic carbodiimide compound (B). The content of a polyvalent hydroxyl group-containing compound (C-1), which is a polyhydric alcohol or a partial ester thereof, having a hydroxyl number of 200 or more is less than 0.05 parts by mass with respect to 100 parts by mass of the polybutylene terephthalate resin (A). The polybutylene terephthalate resin composition satisfies formula 1. In formula 1, a represents the carbodiimide group content (meq / kg) per 1 kg of the polybutylene terephthalate resin composition, and b represents the intrinsic viscosity (dL / g) of the polybutylene terephthalate resin (A).　Formula 1: (-15.4×b)+19.3≤a≤(-57.4×b)+59.3

The invention discloses a kind of recycling polypropylene to prepare high-impact material and preparation method thereof, relate to the field of materials. When the present invention uses recycling polypropylene to prepare high-impact material, first, polypropylene is grafted with vinyl diphenylphosphine, then reacted with 1-(3-chlorophenyl)-2-propyn-1-ol, and then reacted with 6-(methyl formate) pyridine-3-boric acid to obtain modified polypropylene; Secondly, calcium carbonate pretreated with 3-aminopropyltrimethoxysilane and 3-thiophene carboxaldehyde are reacted, and thiophene, 6-(thiophene-2-yl) pyridine-2-carboxylic acid, and 6-(3-thienyl) pyridine-2-carboxaldehyde are polymerized on the surface of calcium carbonate to obtain modified calcium carbonate; Finally, recycled polypropylene, modified polypropylene, modified calcium carbonate, sodium cyanide, and bismaleimide are melt-blended, and then extrusion granulation is performed to obtain high-impact material; The high-impact material prepared by the present invention has good impact resistance, anti-aging performance and antibacterial performance.