31 results about "METHYLPROPANEDIOL" patented technology

The invention relates to the technical field of high polymer material synthesis, and particularly discloses methylpropanediol modified polyester and a preparation method thereof. The methyl propylene glycol modified polyester is prepared from the following raw materials in molar ratio through esterification-polycondensation: terephthalic acid and dihydric alcohol, the dihydric alcohol comprises ethylene glycol, diethylene glycol and methyl propylene glycol; the methylpropanediol is subjected to cyclodextrin inclusion treatment before being used; the molar ratio of the terephthalic acid to the ethylene glycol to the diethylene glycol to the methyl propylene glycol is 1: (0.7-0.9): (0.01-0.05): (0.2-0.6). The methyl propylene glycol modified polyester prepared in the invention has a low melting point and good mechanical properties.

The present application relates to a kind of powder coating hydroxyalkylamide matting curing agent and its preparation method, the matting curing agent using including citric acid, 2-methyl-1,3-propanediol, dimethylbenzene, anhydrous methanol, N-methyl monoethanolamine, catalyst, nanometer titanium dioxide is reacted to obtain raw materials.In first, citric acid and 2-methyl-1,3-propanediol are grafted to carry out reaction, then the remaining four carboxyl groups of grafting are methyl esterification reaction, obtain methyl esterification product, then with N-methyl monoethanolamine acylation reaction obtains hydroxyalkylamide curing agent;Add nanometer titanium dioxide, fully mix and process to obtain the matting curing agent.The curing agent product functionality is higher, the hardness of coating film after curing is higher, and the boiling water resistance is excellent;And the coating film after curing has obvious matting effect, coating film gloss is basically reached 50-70%, and the decorative property is excellent.

The application discloses a kind of super branched chain high-performance environmentally friendly phthalate plasticizers, PVC product and its preparation method and application, belong to material technical field.The super branched chain high-performance environmentally friendly phthalate plasticizers are esterified and polycondensed by polybasic acid and mixed dihydric alcohol in the presence of catalyst, and are obtained by monohydric alcohol end-capping;Polybasic acid includes trimellitic anhydride, mixed dihydric alcohol includes at least two of methyl propylene glycol, neopentyl glycol, ethylene glycol and propylene glycol.The super branched chain high-performance environmentally friendly phthalate plasticizers are well compatible with PVC, good color, with good viscosity, density, acid value and other performance indicators, which is used in PVC product, can make PVC product not only has superior aging resistance and electrical insulation performance, but also has outstanding oil extraction resistance, migration resistance, volatile resistance and thermal stability performance.

The application relates to a low-eutectic solvent-based gel electrolyte, a preparation method and a zinc-air battery, and belongs to the technical field of metal-air batteries. Choline chloride and 2-methyl-1,3-propanediol are prepared into a deep eutectic solvent, then zinc acetate dihydrate solution, acrylic acid monomer, a crosslinking agent and a photoinitiator are sequentially added, the mixture is uniformly mixed, photopolymerization is carried out, and a low-eutectic solvent-based gel is obtained. The electrolyte is obtained by soaking the gel in a mixed solution of potassium hydroxide and zinc salt. The zinc anode protection capability and the low-temperature adaptability of the gel electrolyte can be improved. The gel electrolyte is assembled into a zinc-air battery together with a zinc electrode and an air electrode, and the cycle life and the operation stability of the battery in a low-temperature environment can be effectively improved.

The invention relates to a system and a method for preparing 2-methyl-1, 3-propylene glycol diacetate. The system comprises: a preheater, which is used for preheating 2-methylene-1, 3-propylene glycol diacetate and hydrogen; the hydrogenation reactor is connected with the preheater and is used for providing a reaction place for hydrogenation reaction of 2-methylene-1, 3-propylene glycol diacetate and hydrogen; the hydrogenation reactor is filled with a hydrogenation catalyst loaded with a Pd-based bimetallic catalyst; the gas-liquid separator is connected with the hydrogenation reactor and is used for separating the 2-methyl-1, 3-propylene glycol diacetate generated in the hydrogenation reactor from the residual hydrogen; and the refining tower is connected with the bottom of the gas-liquid separator and is used for purifying the 2-methyl-1, 3-propylene glycol diacetate. Compared with the prior art, the method is good in atom economy, low in raw material cost, high in catalyst activity, good in stability, high in production continuity degree, simple in reaction separation process, high in product purity and suitable for large-scale production.

The invention provides a titanium dioxide slurry and a coating using the same, the titanium dioxide slurry comprises the following components by weight: 70-75 parts of titanium dioxide, 0.3-2 parts of hyperbranched polyester, 0.2-1.5 parts of a multifunctional regulator, and 0.5-3.5 parts of a dispersant; the number-average molecular weight of the hyperbranched polyester is 1000 to 8000 g / mol, and the hydroxyl value of the hyperbranched polyester is 350 to 650 mg KOH / g; the multifunctional regulator is organic amine, and the organic amine comprises at least one of 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1, 3-propylene glycol and triethanolamine; the dispersing agent is a modified styrene-maleic acid copolymer solution, and the content of active ingredients in the modified styrene-maleic acid copolymer solution is not less than 30%. The titanium dioxide slurry has good dispersity and storage stability, so that the titanium dioxide slurry can be well dispersed and stably exist in a coating when being applied to the coating as a pigment, high covering power is achieved, and when the titanium dioxide slurry is applied to stain-resistant and matte coatings, it can be guaranteed that the coating still has good stain resistance and matte performance.

The invention relates to an astragalus membranacus root extract-containing composition for soothing, repairing and moisturizing skin, the composition comprises an astragalus membranacus root extract, glycerol, methylpropanediol, soothing and repairing components, an antioxidant, a thickening agent and water, and in the cosmetic composition, the weight percentage of the astragalus membranacus root extract is 1-2%. The composition has excellent soothing, repairing and moisturizing functions, and can improve the skin barrier function and effectively relieve the sensitive skin problem.

The invention relates to the technical field of photocatalytic adsorption materials, and discloses a preparation method of a photocatalytic adsorption material, hydroxyl in nano zinc oxide and epoxy groups in epoxy chloropropane are subjected to a ring-opening reaction to obtain hydroxypropyl chlorinated zinc oxide, chitosan is alkalized by sodium hydroxide, and the chitosan is subjected to a reaction to obtain the photocatalytic adsorption material. The preparation method comprises the following steps: carrying out a substitution reaction on amino contained in the chitosan and chlorine in hydroxypropyl chlorinated zinc oxide to obtain chitosan-loaded nano zinc oxide, carrying out a ring-opening reaction on 2-amino-2-methyl-1, 3-propylene glycol and pyromellitic dianhydride to obtain an intermediate 1, adding a p-toluenesulfonic acid catalyst into the intermediate 1, and carrying out a polymerization reaction to obtain hyperbranched polyesteramide. And finally, stirring and mixing the chitosan-loaded nano zinc oxide and the hyperbranched polyesteramide to obtain the photocatalytic adsorption material. The prepared photocatalytic adsorption material has an excellent photocatalytic adsorption effect on methylene blue.

This application relates to the technical field of polymer synthesis, specifically disclosing a methyl propylene glycol-modified polyester and its preparation method. A methyl propylene glycol-modified polyester is prepared by esterification-polymerization of raw materials in the following molar ratio: terephthalic acid and a diol; the diol includes ethylene glycol, diethylene glycol, and methyl propylene glycol; the methyl propylene glycol is subjected to cyclodextrin inclusion treatment before use; the molar ratio of terephthalic acid, ethylene glycol, diethylene glycol, and methyl propylene glycol is 1:(0.7~0.9):(0.01~0.05):(0.2~0.6). The methyl propylene glycol-modified polyester obtained by this application has a low melting point and good mechanical properties.

The invention belongs to the technical field of daily cosmetics, and particularly discloses double-continuous-phase cleansing oil and a preparation method thereof. The bicontinuous phase cleansing oil comprises a component A and a component B. The component A is prepared from 1%-10% of PEG-7 glyceryl cocoate, 10%-20% of PEG-20 glyceryl triisostearate, 10%-30% of cetyl alcohol ethyl hexanoate, 10%-30% of coconut oil alcohol-octoate / caprate and 10%-20% of isododecane. The component B is prepared from 1 to 15 percent of methylpropanediol, 1 to 10 percent of glycerol, 0.5 to 2 percent of radix gentianae macrophyllae extract, 1 to 10 percent of butanediol, 0.5 to 2 percent of 1, 2-hexanediol, 0.5 to 3 percent of 1, 2-pentanediol, 0.5 to 2 percent of cordyceps sinensis mycelium powder and the balance of water. According to the present invention, the component A and the component B are mixed to form the continuous and stable three-dimensional network structure with the oil channel and the water channel penetrating through each other, such that the instant emulsification, the easy washing, the refreshing skin feeling and the functional component can be provided so as to achieve the omnibearing cleaning;

This invention discloses a biodegradable PBAT coating resin, its preparation method, and its applications, belonging to the field of polymer material modification technology. The specific preparation method involves: PBAT-M copolymers are prepared by polycondensation of terephthalic acid, adipic acid, 1,4-butanediol, and 2-methyl-1,3-propanediol under a catalyst; the PBAT-M copolymer, initiator, and maleic anhydride are mixed and melt-extruded to obtain maleic anhydride-grafted modified PBAT-M copolymers; silica nanoparticles are dispersed in an acetic acid solution of chitosan to obtain chitosan surface-functionalized silica nanoparticles; the maleic anhydride-grafted modified PBAT-M copolymer, chitosan surface-functionalized silica nanoparticles, flow modifier, and PBAT are mixed and melt-extruded to obtain a biodegradable PBAT coating resin. This invention improves melt flowability by introducing a side-methyl-containing comonomer, enhances interfacial adhesion to paper substrates through maleic anhydride grafting, and imparts antibacterial and reinforcing properties to the material through chitosan surface-functionalized nanoparticles.

The invention relates to an underfill adhesive and a preparation method thereof, the underfill adhesive comprises the following raw materials by weight: 5-20 parts of epoxy resin, 10-30 parts of modified bismaleimide resin, 1-10 parts of a diluent, 0.1-2 parts of a pigment, 0.1-2 parts of a coupling agent, 5-20 parts of a curing agent, 0.5-5 parts of an initiator, 0.1-5 parts of an accelerator, and 40-70 parts of a filler, the modified bismaleimide resin is a bismaleimide resin modified by methacrylic acid adamantyl ester. According to the invention, the resin contains rigid alicyclic ring (methyl adamantane ester) which has high symmetry and low polarity, so that the polarization loss and the dielectric constant can be reduced, and meanwhile, the maleimide ring has excellent heat resistance, mechanical property and heat and humidity resistance; therefore, the underfill adhesive has the characteristics of low dielectric, high mechanical property, process compatibility, long service life, high reliability and the like.

The invention discloses high-transparency low-carboxyl PETG (polyethylene terephthalate glycol) and a continuous polymerization method thereof, and belongs to the technical field of material preparation. The method comprises the following steps: firstly, independently esterifying 1, 4-benzene dicarboxylic acid (PTA) with 2, 2-dimethyl-1, 3-propylene glycol (NPG) and 1, 2-ethylene glycol (MEG) respectively, and further mixing and copolymerizing to finally obtain a repetitive unit PETG consisting of 1, 4-benzene dicarboxylic acid glycol ester and 1, 4-benzene dicarboxylic acid 2, 2-dimethyl-1, 3-propylene glycol ester units. The prepared PETG has the characteristics of high transparency, high strength, high intrinsic viscosity, low carboxyl content, high thermal stability, low micromolecule content and high esterification conversion rate.

The invention belongs to the technical field of printing ink, discloses alcohol-soluble modified ink for solving wrinkles of a shrink label and a preparation method of the alcohol-soluble modified ink, and is particularly suitable for shrink label printing of a PETG (polyethylene terephthalate glycol) substrate film. According to the ink, a silane coupling agent is adopted to modify polyurethane (PU) and acrylic acid (AR) resin respectively, then an external cross-linking reaction is performed to form a-Si-O-Si-interpenetrating polymer network (IPN) structure (figure 1), and an alcohol solvent taking ethanol as a main component is selected to replace traditional ester and ketone solvents. Through resin modification and solvent system optimization, the prepared printing ink can effectively avoid wrinkling and delaminating phenomena of labels in the thermal shrinkage process, meanwhile, the dual requirements for environmental protection and high performance are met, and the printing ink is suitable for packaging and printing in the fields of drinks, washing, electronics, wines and the like.

This invention provides a polyester film comprising: a first polyester resin including a first acid unit and a first alcohol unit. The first acid unit comprises terephthalic acid units at a total content of 90 mol% or more relative to the total amount of the first acid unit; the first alcohol unit comprises ethylene glycol units at a total content of 50 mol% or more relative to the total amount of the first alcohol unit, 2,2-dimethyl-1,3-propanediol units at a content of 5 mol% to 40 mol% relative to the total amount of the first alcohol unit, and diethylene glycol units at a content of 0.1 mol% to 5 mol%. The content of the first polyester resin is 80% by mass or more relative to the total amount of the polyester film, and the thickness of the polyester film is 25 μm to 100 μm.

An unsaturated polyester resin for jade-like handicrafts and a preparation method thereof belong to the technical field of polyester resins and comprise the following components: diethylene glycol, methyl propylene glycol, propylene glycol, maleic anhydride, phthalic anhydride, antioxidant, polymerization inhibitor, paraffin, stabilizer, ultraviolet absorber, whitening agent and diluent. The weight ratio of propylene glycol to methyl propylene glycol is 1.0-1.3:1, and the content of methyl propylene glycol in the total dihydric alcohol is 20-22%; the weight ratio of maleic anhydride to phthalic anhydride is 0.46-0.52:1; the preparation steps are as follows: 1) the raw materials and antioxidant are added into a reactor, and after warming, the temperature is kept for 0.5-1.0 h, and then the temperature is continuously increased; 2) after warming, the reaction is carried out for 2-3 h; dehydration is carried out until the acid value is 20-25 mgKOH / g; 3) the temperature is decreased, and the auxiliary agent is added and uniformly mixed to obtain the unsaturated polyester resin. The resin of the present application is water-white, and the liquid index and physical properties can meet the requirements of jade-like handicrafts.

The invention discloses biodegradable PBAT (poly (butylene adipate-co-terephthalate)) spraying film resin, a preparation method and application, and relates to the technical field of high polymer material modification, and the specific preparation method comprises the following steps: carrying out condensation polymerization on terephthalic acid, adipic acid, 1, 4-butanediol and 2-methyl-1, 3-propylene glycol under the action of a catalyst to prepare a PBAT-M copolymer; uniformly mixing the PBAT-M copolymer, an initiator and maleic anhydride, and performing melt extrusion to obtain a maleic anhydride grafted modified PBAT-M copolymer; the preparation method comprises the following steps: dispersing silicon dioxide nanoparticles in an acetic acid solution of chitosan to obtain chitosan surface functionalized silicon dioxide nanoparticles; and uniformly mixing the maleic anhydride grafted modified PBAT-M copolymer, the chitosan surface functionalized silicon dioxide nanoparticles, a flow modifier and PBAT, and carrying out melt extrusion to prepare the biodegradable PBAT spraying film resin. The melt flowability is improved by introducing a comonomer containing side methyl, the interface adhesion with a paper base is improved through maleic anhydride grafting, and the material is endowed with antibacterial and reinforcing properties through chitosan surface functionalized nanoparticles.

The application relates to the technical field of industrial membrane filtration, in particular to a method for depositing a membrane coating on the surface of a membrane tube and a membrane tube with a membrane coating, which comprises the following steps: fixing a plurality of membrane tubes in a deposition reaction chamber and discharging air in the deposition reaction chamber; introducing gaseous neopentyl glycol into the deposition reaction chamber to deposit and grow a layer of neopentyl glycol membrane on the membrane tube or the previous layer of methyl propylene glycol membrane; discharging the gaseous neopentyl glycol in the deposition reaction chamber; introducing methyl propylene glycol into the deposition reaction chamber to deposit and grow a layer of methyl propylene glycol membrane on the previous layer of neopentyl glycol membrane; discharging the gaseous methyl propylene glycol in the deposition reaction chamber; and repeating the deposition and growth of the neopentyl glycol membrane and the methyl propylene glycol membrane according to a predetermined cycle number to deposit and grow a membrane coating with a predetermined thickness on the surface of the membrane tube. The application forms a membrane coating with higher filtering precision on the surface of the membrane tube, greatly improves the precision of membrane filtration, improves the filtering efficiency and the application range, and reduces the operation energy consumption and investment.

The application relates to the technical field of photocatalytic adsorption materials, and discloses a preparation method of a photocatalytic adsorption material, wherein a ring-opening reaction is carried out between hydroxyl groups in nano zinc oxide and epoxy groups in epichlorohydrin to obtain hydroxypropyl chlorinated zinc oxide; chitosan is alkalized by sodium hydroxide; substitution reaction occurs between amino groups contained in the chitosan and chlorine in the hydroxypropyl chlorinated zinc oxide to obtain chitosan-loaded nano zinc oxide; 2-amino-2-methyl-1,3-propanediol and pyromellitic dianhydride are subjected to ring-opening reaction to obtain an intermediate 1; a polymerization reaction occurs between the intermediate 1 and a p-toluenesulfonic acid catalyst to obtain hyperbranched polyamide ester. Finally, the chitosan-loaded nano zinc oxide and the hyperbranched polyamide ester are stirred and mixed to obtain the photocatalytic adsorption material. The photocatalytic adsorption material prepared by the application has excellent photocatalytic adsorption effect on methylene blue.

This invention provides a metal surface anti-corrosion coating and its processing method, relating to the field of coating processing technology. The processing method includes: (1) reacting 2-furan carboxaldehyde and 2-acetylpyridine to obtain 2,2':6',2"-terpyridine-4-carboxylic acid; (2) reacting boron nitride and urea to obtain amino-functionalized boron nitride, and then reacting it with 2,2':6',2"-terpyridine-4-carboxylic acid to obtain modified boron nitride; (3) reacting 3,4,5-trimethoxycinnamic acid sequentially with 2-ethyl-2-(hydroxymethyl)-1,3-propanediol and epichlorohydrin to obtain cinnamic acid ester epoxy monomer; (4) mixing epoxy resin, cinnamic acid ester epoxy monomer, modified boron nitride, curing agent, defoamer, and ethyl acetate to prepare a coating slurry, coating and drying to obtain a metal surface anti-corrosion coating. The metal surface anti-corrosion coating obtained by the above processing method has good anti-corrosion and weather resistance.

A plasticizer and a method for manufacturing the plasticizer are provided. The method includes steps as follow. A dicarboxylic acid, a diol, and a catalyst are mixed to form a reactant mixture. The reactant mixture is reacted at a temperature ranging from 130° C. to 220° C. to form a semi-product. An endcapping alcohol into the semi-product at a temperature ranging from 205° C. to 220° C. to form a coarse plasticizer. The coarse plasticizer is purified under a pressure ranging from 760 Torr to 5 Torr to obtain the plasticizer. The dicarboxylic acid includes a first dicarboxylic acid and a second dicarboxylic acid, and the second dicarboxylic acid is adipic acid. The diol includes diethylene glycol and 2-methyl-1, 3-propanediol. The endcapping alcohol includes isooctyl alcohol, isodecyl alcohol, or 2-propylheptanol. A molar ratio of dicarboxylic acid:diol:the endcapping alcohol ranges from 1:0.6 to 0.9:0.3 to 0.6.

The present invention relates to a urea-solution efflorescence dissolving additive and a method for manufacturing the same, and more particularly, to a urea-solution efflorescence dissolving additive and a method for manufacturing the same, comprising: a step of manufacturing (S1) a mixture by stirring and mixing monoethanolamine, triethanolamine, methylpropylenetriol, and methylpropylene glycol; a filtering step (S2) of filtering the mixture to manufacture a filtered mixture; and a removing step (S3) of removing metal ions and impurities from the filtered mixture to manufacture an impurity-removed mixture; thereby providing a urea-solution efflorescence dissolving additive and a method for manufacturing the same, wherein the present invention is mixed with urea-solution injected into an existing SCR catalyst device for a diesel vehicle to minimize efflorescence occurring in a urea-solution nozzle and a urea-solution pump, and to clean adsorbed urea-solution crystals while promoting normal operation of the SCR to reduce carbon dioxide and NOx emissions.

The application relates to the technical field of photocatalytic adsorption materials, and discloses a preparation method of a photocatalytic adsorption material based on hyperbranched polyamide ester and chitosan loaded nano zinc oxide, wherein a ring-opening reaction is carried out between hydroxyl groups in nano zinc oxide and epoxy groups in epichlorohydrin to obtain hydroxypropyl chlorinated zinc oxide; chitosan is alkalized by sodium hydroxide, substitution reaction occurs between the amino groups contained in the chitosan and chlorine in the hydroxypropyl chlorinated zinc oxide to obtain chitosan loaded nano zinc oxide; 2-amino-2-methyl-1,3-propanediol and pyromellitic dianhydride are subjected to ring-opening reaction to obtain an intermediate 1; then, p-toluenesulfonic acid catalyst is added to the intermediate 1 to generate polymerization reaction and obtain hyperbranched polyamide ester. Finally, the chitosan loaded nano zinc oxide and the hyperbranched polyamide ester are stirred and mixed to obtain the photocatalytic adsorption material. The photocatalytic adsorption material prepared by the application has excellent photocatalytic adsorption effect on methylene blue.

The invention relates to the technical field of new materials of spraying powder, and particularly discloses spraying powder applied to metal parts and a preparation method of the spraying powder. Wherein the spraying powder is prepared from the following raw materials: polyester resin, a TGIC curing agent, a flatting agent, modified filler and pigment; the polyester resin is carboxyl-terminated polyester resin with an acid value of 25 to 30 mgKOH / g; the carboxyl-terminated polyester resin comprises the following raw materials: polyol, a functional monomer, polyacid, a branching agent, an end-capping reagent, a catalyst and an antioxidant. The functional monomer comprises 2, 2-dimethyl-1, 3 propylene glycol hydroxyl pivalate monoester and 4-amino-1-butanol, and the mass ratio of the 2, 2-dimethyl-1, 3 propylene glycol hydroxyl pivalate monoester to the 4-amino-1-butanol is 1: (0.5-0.8). The surface quality of the coating can be effectively improved, and the pinhole resistance and the mechanical property of the coating are improved.

The application provides a method for preparing unsaturated polyester resin by waste PET degradation, and the method uses ethylene glycol, propylene glycol and 2-methyl-1,3-propanediol as a composite alcoholysis agent, uses metal carboxylate, metal oxide and ionic liquid as a composite catalyst, realizes efficient alcoholysis of the polyester under the joint action of multiple small-molecule polyols and multiple catalysts, removes the catalyst and other impurities remaining in the alcoholysis product through ultrasonic stirring treatment to reduce the influence of the catalyst and other impurities on the performance of the final product, and finally reacts the alcoholysis product with unsaturated acid anhydride to obtain high-strength unsaturated polyester, so that green and efficient recycling of the polyester is realized.

The application provides a preparation method of a bio-based high-toughness Vitrimer crosslinking network, and belongs to the field of polymer preparation. The Vitrimer is prepared by using vanillin and aminomethylpropanediol as raw materials, and performing an epoxidation reaction on a hydroxyl Schiff base by using epichlorohydrin under the action of a phase transfer catalyst. The prepared epoxy resin is mixed with commercially available glycerol triglycidyl ether and graphene oxide to form a mixed system, and then is cured and crosslinked by using a curing agent. The Vitrimer prepared by the application has high toughness and mechanical strength. In addition, the raw materials selected by the application are green and non-toxic, the cost is low, the synthesis steps are simple, the operation is convenient, and the application has high practicability.

The invention relates to a system and a method for preparing 2-methyl-1, 3-propylene glycol through hydrolysis of 2-methyl-1, 3-propylene glycol ester, and the method comprises the following steps: 2-methyl-1, 3-propylene glycol ester, water and a hydrolysis catalyst enter a mixing tank, materials mixed by the mixing tank enter a hydrolysis reactor, under the action of the hydrolysis catalyst, the 2-methyl-1, 3-propylene glycol ester is generated, and the hydrolysis catalyst is added into the hydrolysis reactor to react to generate the 2-methyl-1, 3-propylene glycol ester. The reacted material enters a gas-liquid separation tower after being subjected to heat exchange through a heat exchanger, the separated water and material circularly enter a mixing tank, the material at the bottom of the gas-liquid separation tower enters an acetic acid recovery tower, high-purity acetic acid is extracted from the top of the acetic acid recovery tower, the material at the bottom of the acetic acid recovery tower enters a refining tower, and high-purity 2-methyl-1, 3-propylene glycol is obtained from the top of the refining tower; and extracting unreacted 2-methyl-1, 3-propylene glycol from the bottom of the refining tower, and circularly returning the unreacted 2-methyl-1, 3-propylene glycol to the hydrolysis reactor. The method is good in atom economy, low in raw material cost, high in catalyst activity, good in stability, simple and efficient in process, high in production continuity degree, simple in subsequent separation and purification, high in product purity and suitable for large-scale production.

Provided is a composition comprising 2-methylene-1,3-propanediol diacetate (P) and an isomer (Pi) of 2-methylene-1,3-propanediol diacetate, wherein the content of the isomer (Pi) of 2-methylene-1,3-propanediol diacetate is 100-100,000 mass ppm with respect to the content of 2-methylene-1,3-propanediol diacetate (P).

A plasticizer and a method for manufacturing the plasticizer are provided. The method includes the following steps. A dicarboxylic acid, a diol, and a catalyst are mixed to form a reactant mixture. The reactant mixture is reacted at a temperature ranging from 130° C. to 220° C. to form a semi-product. An endcapping alcohol is added into the semi-product at a temperature ranging from 205° C. to 220° C. to form a coarse plasticizer. The coarse plasticizer is purified under a pressure ranging from 760 Torr to 5 Torr to obtain the plasticizer. The dicarboxylic acid includes succinic acid or adipic acid. The diol includes diethylene glycol and 2-methyl-1,3-propanediol. The endcapping alcohol is an ether alcohol or a fatty alcohol having a carbon number of less than or equal to 4. The dicarboxylic acid, the diol, and the endcapping alcohol have a molar ratio ranging from 1:0.6 to 0.9:0.3 to 0.6.