33 results about "Undecylenic acid" patented technology

The invention belongs to the technical field of medicines, and particularly relates to application of 10-undecylenic acid and polymyxin in preparation of an antibacterial drug, and the antibacterial drug aims at one or more of escherichia coli, salmonella and klebsiella pneumoniae. The antibacterial agent aims at bacteria which are resistant to polymyxin. The bacteria directed by the antibacterial agent are multi-drug-resistant gram-negative bacteria. Through a chessboard method minimum inhibitory concentration test, an in-vitro bacterial growth curve proves that 10-undecylenic acid synergistically enhances the antibacterial activity of polymyxin, and meanwhile, a mouse drug-resistant bacterial infection model test proves that 10-undecylenic acid can effectively enhance the in-vivo effectiveness of polymyxin at the animal level. The invention provides a new application of 10-undecylenic acid in enhancing the antibacterial activity of polymyxin antibiotics, and can solve the technical problems of low clinical drug resistance and therapeutic index of polymyxin and the like.

The invention discloses a composite material as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The composite material comprises the following components in parts by weight: 10-50 parts of epoxy resin; 10-20 parts of vegetable oleic acid; 1-3 parts of sulfur; 70-90 parts of a modified heat-conducting filler; the modified heat-conducting filler is obtained by modifying a heat-conducting filler through a double-bond-terminated silane coupling agent; the vegetable oleic acid comprises at least one of eleostearic acid, linolenic acid, linoleic acid, soybean oleic acid, oleic acid, ricinoleic acid and undecylenic acid. The composite material disclosed by the invention not only has the characteristics of high thermal conductivity and excellent electrical insulation performance, but also has good hot working performance and recycling capability, and shows a wide application prospect in the fields of high-thermal-conductivity green electronic packaging materials, electrical insulation coatings and sustainable composite materials.

To provide extracted plant lipid or microbial lipid comprising docosapentaenoic acid (DPA), and processes for producing the extracted lipid.SOLUTION: Provided is extracted plant lipid or microbial lipid, comprising fatty acids in an esterified form, the fatty acids comprising oleic acid, palmitic acid, ω6 fatty acids which comprise linoleic acid (LA), ω3 fatty acids which comprise α-linolenic acid (ALA) and docosapentaenoic acid (DPA), and optionally one or more of stearidonic acid (SDA), eicosapentaenoic acid (EPA), and eicosatetraenoic acid (ETA), wherein the level of DPA in the total fatty acid content of the extracted lipid is between 7% and 35%.SELECTED DRAWING: None

The invention discloses a process for preparing undecylenic acid by microwave heating and enzyme hydrolysis under negative pressure, namely water and methyl undecylenate are subjected to enzyme catalytic hydrolysis under the conditions of microwave heating and negative pressure to generate undecylenic acid and methanol. According to the process, bio-enzyme is used as a catalyst, the process of a traditional saponification and acidification process is shortened, the reaction rate and selectivity are improved, and meanwhile, mild reaction conditions are more friendly to equipment and the environment; the removal of methanol is accelerated under a negative pressure condition, and the reaction rate and the conversion rate of hydrolysis are effectively improved; the reaction rate and the conversion rate are improved by utilizing the thermal effect and the non-thermal effect of microwave heating, the reaction temperature is only 40 DEG C, the reaction time is 2 hours, the conversion rate reaches 95% or above, and meanwhile, the energy consumption in the process is relatively low. A new process is provided for preparing undecylenic acid, the reaction rate and the conversion rate are effectively increased, and the purposes of energy conservation, consumption reduction and environmental protection in the technological process are achieved.

The invention relates to the technical field of composite materials, in particular to a high-strength honeycomb paper core cover plate and a preparation process thereof. The preparation method comprises the following steps: taking isophorone diisocyanate, polycaprolactone diol, hydroxypropyl-terminated polysiloxane and acrylic acid-2-hydroxyethyl ester as raw materials, and reacting to obtain a mixed polyurethane prepolymer; the preparation method comprises the following steps: reacting 1, 3-bis (N, N-diglycidyl aminomethyl) cyclohexane with undecylenic acid to obtain a cross-linking agent; bisphenol A epoxy resin, the mixed polyurethane prepolymer, a cross-linking agent, a flame retardant, a photoinitiator, a plasticizer, a curing agent and deionized water are mixed and stirred to obtain epoxy modified polyurethane glue; the high-strength honeycomb paper core cover plate is obtained by using a glass fiber felt to wrap a honeycomb paperboard, spraying epoxy modified polyurethane glue on two sides, compounding with a fabric after photocuring, and heating and pressing. The prepared honeycomb paper core cover plate is high in strength, good in moisture resistance and not prone to cracking.

The invention belongs to the technical field of cosmetics, and discloses a composition with oil control and dandruff removal effects as well as a preparation method and application thereof. The composition disclosed by the invention comprises the following components: propylene glycol undecylenic acid ester, a myrtle fruit extract and a saccharide isomeride. According to the composition, the propylene glycol undecylenic acid ester, the myrtle fruit extract and the saccharide isomeride are combined, synergistic interaction is achieved among the components, and the composition has the effects of controlling scalp oil, repairing and relieving scalp, is non-irritant to scalp, safe and mild, can effectively remove scalp dandruff, controls scalp oil while effectively removing dandruff, and has the effects of relieving scalp dandruff, relieving scalp dandruff, relieving scalp dandruff, relieving scalp dandruff, relieving scalp dandruff, relieving scalp dandruff, relieving scalp dandruff and relieving scalp dandruff. The scalp is relieved, and the scalp problem is fundamentally solved.

The present invention primarily relates to the use of a fatty acid ester or of a mixture of two or more fatty acid esters or of a mixture comprising one or more fatty acid esters, wherein the fatty acid ester or one, two, three or more, preferably all, of the fatty acid ester(s) is / are selected from the group consisting of 3-hydroxypropyl caprylate, glyceryl monocaprylate, 3-hydroxypropyl undecylenate and glyceryl monoundecylenate, for modifying the sensory properties of a skin care product. The present invention further relates to methods for modifying the sensory properties of a skin care product as well as to methods for manufacturing a skin care product and to particular skin care products.

This invention discloses a microwave-assisted synthesis process for 11-bromoundecenoic acid. The specific steps are as follows: undecenoic acid is mixed with a nonpolar solvent, an initiator is added, and the mixture is stirred. The resulting preliminary reaction mixture is then transferred to a microwave reactor. After adjusting the microwave power and controlling the temperature, the mixed solution undergoes an anti-Markovnikov addition reaction with hydrogen bromide gas within the microwave reactor to generate a bromoundecenoic acid solution. The resulting addition solution is then transferred to a crystallization vessel for freeze crystallization. The crystallized product is filtered to obtain 11-bromoundecenoic acid. This invention utilizes hydrogen bromide aeration and mechanical stirring in the microwave reactor to increase the gas-liquid mass transfer area and improve mass transfer efficiency. The microwave-assisted synthesis of 11-bromoundecenoic acid achieves molecular-level stirring, significantly shortening the reaction time and effectively increasing the yield of the target product. Simultaneously, the use of a nonpolar solvent with weak microwave absorption effectively avoids the thermal effect generated by microwaves, resulting in an even higher yield of the target product.

The invention discloses a process and a device for preparing and purifying undecylenic acid, and the process comprises the following steps: under the condition of negative pressure, firstly carrying out biological enzyme catalytic hydrolysis on methyl undecylenate to obtain undecylenic acid and methanol, and then carrying out filtration, liquid separation and melt crystallization on reaction liquid to obtain purified undecylenic acid, meanwhile, unconverted methyl undecylenate and water are recycled, and generated methanol is recycled. The bio-enzyme is used as a catalyst, the reaction condition is mild, the reaction rate is high, compared with a saponification acidification process, acid utilization and waste salt generation are avoided, and the method is relatively friendly to the environment and equipment; the reaction is carried out under a negative pressure condition, so that the raw material hydrolysis conversion rate is effectively improved; by using a melt crystallization method and a corresponding separation device, a high-yield and high-purity product is easy to obtain. The invention provides a novel process and device for preparation and purification of undecylenic acid, the process conditions are mild, the device is simple, the energy consumption is small, the production efficiency and quality of the product are improved, and the environmental protection property of the production process is also improved.

The present disclosure relates to a deodorising composition containing: (a) 1-para-menthen-8-thiol, (b) 3-mercaptohexyl acetate and (c) undecylenic acid or a derivative thereof. It also relates to the use of the disclosed composition for eliminating bad odours, and to a deodorant product in the form of an aerosol, a candle or a perfume diffuser that has a wick or a stick or is electric. Also provided is an article consisting of a solid polymeric material, in particular a silicone elastomer, containing the disclosed composition.

The invention belongs to the field of rubber, and particularly relates to a natural rubber material for a loading wheel of a tank and a preparation method thereof. The natural rubber material for the loading wheel of the tank is prepared from the following raw materials: natural rubber, 10-zinc undecylenate, aluminum acrylate, 4-vinyl-methyl benzoate, benzoyl peroxide, modified carbon black, modified short carbon fibers, stearic acid, an anti-aging agent, aluminum hydroxide, dibutyl phthalate and sulfur. The prepared rubber material has the hardness of 58-60 Shore A degrees, the tensile strength reaches up to 37.54 MPa, the elongation at break and the 300% stress at definite elongation can reach 547.26% and 9.65 MPa, the comprehensive performance is excellent, and the rubber material has good application in materials such as a tank loading wheel crawler belt.

The application belongs to the technical field of washing and decontamination, and relates to preparation and application of a calcium and magnesium resistant mono-aryl connected gemini surfactant. The preparation method comprises the following steps: mixing methyl undecylenate, benzene and methanesulfonic acid, and performing heating reaction; mixing the obtained product, methyl undecylenate and methanesulfonic acid, and performing heating reaction; mixing the obtained product, N,N-dimethyl-1,3-propanediamine, and performing heating reaction; mixing the obtained product, a halide salt and sodium carbonate, and performing heating reaction to obtain phenyl bis-undecanoic acid amide hydroxyl sulfonate, namely the mono-aryl connected gemini surfactant. Compared with the prior art, the application can achieve good decontamination effect in a higher hard water concentration solution without additional addition of a chelating agent.

The invention discloses a high-dispersity fluorescent whitening functional aid as well as a preparation method and application thereof, and relates to the technical field of functional dyes. The high-dispersity fluorescent whitening functional aid comprises the following raw materials in parts by weight: 40-50 parts of a fluorescent whitening agent, 10-15 parts of sodium lignin sulfonate, 5-8 parts of a pH buffer agent, 3-5 parts of an anti-aging agent and 50-70 parts of deionized water. Undecylenic acid and hexaethylene glycol monomethyl ether react to generate an ester group compound, the ester group compound generates an epoxy compound under the action of hydrogen peroxide and formic acid, 4, 4 '-diaminostilbene-2, 2'-disulfonic acid and trimellitic anhydride react to generate a tetracarboxyl compound, and the tetracarboxyl compound and the epoxy compound react to generate an epoxy compound. And reacting the epoxy compound with the tetracarboxyl compound to generate the fluorescent whitening agent. The prepared high-dispersity fluorescent whitening functional aid has excellent dispersity, stability and anti-aging performance, and has important application significance in the field of cotton fiber textiles.

Compositions including a complex of fatty acids (e.g., including one or more C4 to C40 fatty acids, such as a C4 to C20 fatty acid) and one or more amino acids (and particularly one or more amino acids having electrically charged basic side chains, e.g., Arginine, Lysine, etc.) for use as an anti-pathogenic composition. These compositions may include the complex of fatty acid:amino acid having a lamellar supramolecular structure. In particular, described herein are therapeutic compositions of undecylenic acid:Arginine forming a complex of undecylenic acid and Arginine.

The invention discloses an inorganic-organic multi-shell toughening agent and a preparation method thereof. According to the toughening agent, nano silicon dioxide serves as a core layer, the surface of the core layer is sequentially coated with titanium dioxide, zirconium oxide, polydopamine and omega-methyl undecylenate to obtain the toughening agent, and the nano silicon dioxide is prepared through an optimized Stober method and is uniform in particle size. According to the toughening agent disclosed by the invention, the inorganic core is coated with the multiple layers of organic shells, so that the problems that a conventional toughening agent is easy to agglomerate, poor in dispersity and poor in compatibility are solved, and meanwhile, adverse effects on the heat resistance and rigidity of a thermosetting olefinic unsaturated resin material are avoided; through strong bonding and crosslinking of organic layer double bonds and resin double bonds, the compatibility and dispersity of the toughening agent and a resin matrix are effectively enhanced, the remarkable toughening effect on a thermosetting olefinic unsaturated resin curing system is achieved from multiple angles, and meanwhile the comprehensive performance such as toughness, mechanical performance, heat resistance and processability of the material is enhanced.

The invention discloses a bio-based polymer capable of being recycled in a closed-loop mode and a preparation method and application of the bio-based polymer. The preparation method comprises the following steps that firstly, isosorbide and acrylic acid are subjected to an esterification reaction to generate a mono-esterification intermediate; respectively carrying out esterification reaction on the single esterification intermediate and bio-based olefine acid 11-dodecenoic acid, cis-tridecane-12-olefine acid, 10-undecylenic acid, 9-decenoic acid, 8-nonenoic acid or 7-octenoic acid containing long-chain alkyl fragments to generate a double esterification intermediate; and carrying out ring-opening metathesis polymerization (ROMP) on the two monomers by using a Grubbs II catalyst to obtain the bio-based polyolefin capable of being recycled in a closed-loop manner. By adjusting the proportion of the raw materials and controlling the reaction time, the relative molecular mass and the mechanical property of the polymer can be regulated and controlled. The polymer can be depolymerized by Grubbs II to obtain a reactant monomer, so that efficient recovery is realized. The bio-based polyolefin material provided by the invention has potential application value in environment-friendly packaging, 3D printing, electronic equipment shells and the like.

The development of biolubricants from vegetable oils, more specifically refers to capric, caprylic, lauric, myristic, palmitic, stearic, oleic, linoleic, linolenic, ricinoleic, isooleic, isostearic, undecylenic fatty acids whose applications are for compressors in refrigerators, freezers, air conditioners, industrial compressors and as lubricants for the automotive line is provided. Such products are used in refrigeration compressors, more specifically in refrigerators and air conditioners, industrial compressors and lubricants for the small and large automotive sector. Due to the use of 90% renewable raw materials, the products are biodegradable, non-toxic and safe to be handled. These products, after use as lubricants, can be discarded due to their biodegradability or recovered to be used in other less rigid applications, such as for the production of polyester resins, polyols for the production of polyurethanes, or production of plasticizers for PVC, paints and varnishes.

The invention relates to the technical field of full-bio-based polyester synthesis, in particular to a full-bio-based heterocyclic monomer which is obtained by mixing equol, DMAP and undecylenic acid for reaction, the molar ratio of equol to DMAP is 1: (1-1.2), and the molar ratio of equol to undecylenic acid is 1: (1-1.2). The invention also discloses a method for regulating and controlling the molecular weight of furyl polyester by adopting the full-bio-based heterocyclic monomer. According to the full-bio-based heterocyclic monomer and the method for regulating and controlling the molecular weight of the furyl polyester, the furyl polyester with the adjustable molecular weight is prepared through rearrangement moving ring-chain balance of a carbon-carbon double bond along a main chain. A heterocyclic monomer can generate an unsaturated polyolefin structure in a copolymerization process, and the polyolefin realizes rearrangement of carbon-carbon double bonds along a main chain through closed-loop depolymerization double decomposition, so that ring-chain balance is shifted, unsaturated polyolefin structural units are alternately integrated in a furyl polyester skeleton, and polyester molecular weight adjustment is successfully realized.

The invention discloses a preparation method and application of an ethylene and polar monomer copolymerized and high-performance polyethylene / carbon fiber composite material, and the high activity, high stability and high molecular weight of a ketimine nickel catalyst indicate the electron donating ability of a catalyst substrate skeleton to a metal center. Methyl in 2, 6-diisopropylaniline provides electron donating capacity and provides steric hindrance, so that the three-dimensional steric hindrance of a metal center is influenced, the electron cloud density of the nickel metal center is increased, the chain transfer rate is slowed down, and the thermal stability of the catalyst is improved. The copolymerization of ethylene and 10-undecylenic acid methyl ester can be realized. Meanwhile, under the industrial temperature condition, polyethylene and carbon fibers are subjected to in-situ polymerization, so that the mechanical property of the composite material is improved. According to the invention, the conditions that the polyethylene has higher mechanical properties and the yield reaches the highest in a low-temperature environment are achieved, and the mechanical properties of the polyethylene are effectively improved by compounding with the carbon fibers at the industrial temperature.

A method for simultaneously detecting five trace herbicides in water belongs to the field of environmental analysis and detection technology. It uses thymol as a hydrogen bond acceptor, and an organic acid selected from decanoic acid, n-hexanoic acid, n-butyric acid, and undecylenic acid as a hydrogen bond donor to synthesize a low eutectic solvent as an extractant, and performs dispersed liquid-liquid microextraction on the water sample; then, high performance liquid chromatography is performed to determine five trace herbicides in the water, wherein the herbicides are bentazon, pyrazosulfuron-methyl, cypermethrin, fenoxaprop-butyl, and pyrimidine oxadiazine. The present invention uses a green solvent low eutectic solvent as a pre-concentrator and extractant, which has the advantages of low cost, safety, and non-toxicity. At the same time, the hydrophobic DES has the characteristics of a low freezing point, so it can be solidified, which greatly reduces the difficulty of enriching trace herbicides in water, makes the experimental operation simple, and greatly reduces the amount of extractant used.

The invention provides a preparation method of an AIH antibody detection kit, the kit and a detection method. The kit comprises a magnetic bead-LKM-1 antigen compound and a goat anti-human IgG (Immunoglobulin G)-biotin compound, the preparation method comprises the following steps: S10, activating magnetic beads, and carrying out chemical crosslinking on an LKM-1 antigen to obtain a magnetic bead-LKM-1 antigen compound; s20, carrying out desalination treatment on the goat anti-human IgG, and carrying out chemical crosslinking on biotin, so as to obtain the goat anti-human IgG-biotin compound; wherein the magnetic beads are prepared by the following steps: S100, preparing magnetic microspheres by adopting a seed swelling method; s200, depositing polytetrafluoroethylene nanoparticles on the surfaces of the magnetic microspheres to obtain composite microspheres; s300, the surfaces of the composite microspheres are coated with methacrylic acid and undecylenic acid, and the magnetic beads are obtained. By adopting the kit provided by the invention, the antibody in a sample can be rapidly detected, the operation is simple, and the detection sensitivity is high; and the detection precision and the resolution ratio are high.

The present invention belongs to the technical field of tertiary oil recovery, and particularly relates to a polyacrylamide for oil displacement, a preparation method thereof and an application. The preparation method is as follows: The reactor is purged with nitrogen, and laurylamine dipropylenediamine, ethanol and allyl chloride are added in sequence, stirred evenly, and heated for heat preservation reaction; Deionized water, acrylamide, [3-(methacryloylamino)propyl]dimethyl(3-thiopropyl)ammonium hydroxide, undecylenic acid and OP-10 are added and stirred until dissolved; The initiator is added to the high-position dropping tank and dropped into the reaction kettle, and the reaction is continued, the temperature is raised by heating, the heat preservation reaction is carried out, and the temperature is lowered to below 40 °C; The above-mentioned mixed solution is dried and granulated to obtain the polyacrylamide for oil displacement. The polyacrylamide for oil displacement of the present invention has the characteristics of high apparent viscosity, good viscosity reduction effect and shear resistance.

The present invention provides a rasagiline mesylate-containing transdermal patch and a preparation method thereof, which further comprises one or more release promoters selected from acetylpropionic acid, octanoic acid, and undecenoic acid, and which is formed by forming a hydrogen bond complex through the cooperative action of rasagiline mesylate with cross-linked polyvidone and a crystallization inhibitor, thereby causing rasagiline mesylate to exist in an amorphous state in a drug carrier and preventing it from existing in an unstable form as a free base.

The invention relates to an ester mixture obtained by esterification of at least one C2-C4 diol or one C3-C4 triol with an acid mixture comprising at least one saturated C2-C9 acid and 10-undecylenic acid. The invention also relates to the use of an ester mixture obtained by esterification of at least one polyol and an acid mixture comprising at least one saturated C2-C9 acid and 10-undecylenic acid as a preservative.

The application belongs to the technical field of water treatment, and particularly relates to an oilfield high-temperature-resistant scale inhibitor as well as a preparation method and application thereof. The preparation method comprises the following steps: introducing nitrogen into a reaction kettle, and sequentially adding butene diacid, vinyl phosphonic acid, sodium allyl sulfonate, undecylenic acid, buffer salt and deionized water, stirring uniformly, and adjusting pH to 7-8; adding an initiator into a high-position dropping groove, and slowly dropping into the reaction kettle; after the dropping is completed, the solution becomes viscous, the solution is automatically heated, when the temperature no longer continues to rise, heating is performed to 60-70 DEG C, and the temperature is kept for 1-2 h, the temperature is reduced to below 40 DEG C, and pH is adjusted to 7-8 by using a sodium hydroxide solution; the reaction product is dried and granulated to obtain the product high-temperature-resistant scale inhibitor. The scale inhibitor has the characteristics of wide raw material sources, simple synthesis process, no pollution and good scale inhibition effect.

The invention discloses a method for preparing high-purity undecylenic acid. The method adopts a preparation and separation method combining rectification, enzyme hydrolysis, solution crystallization and melt crystallization. The method comprises the following steps: firstly, carrying out primary separation and enrichment on the methyl ricinoleate lysate through rectification; hydrolyzing the methyl undecylenate by using biological enzyme to generate undecylenic acid; then, the hydrolysate is purified by adopting solution crystallization, so that the purity and the total yield are improved; and finally, purifying the material until the purity is 99.9% or above through a melt crystallization method. The method for preparing and purifying undecylenic acid has the advantages of high product purity, high yield, safe operation, low energy consumption and the like, undecylenic acid and the solvent in the whole system can be recycled, and the method belongs to a green and efficient preparation and separation process.

The invention relates to a high-temperature-resistant PPS-based cable sheath material and a preparation method thereof, and belongs to the technical field of cable sheath material preparation. The outer skin material comprises the following raw materials in parts by weight: 100-110 parts of polyphenylene sulfide, 10-35 parts of a temperature-resistant plasticizer and 20-55 parts of a modified filler. The temperature-resistant plasticizer is prepared by carrying out a substitution reaction on temperature-resistant polyhydric alcohol and 5, 5-dimethyl-2-chloro-1, 3, 2-dioxo phosphorus hetero-caprolactone phosphate, and the temperature-resistant plasticizer is prepared by carrying out a substitution reaction on the temperature-resistant polyhydric alcohol and 5, 5-dimethyl-2-chloro-1, 3, 2 The temperature-resistant polyhydric alcohol is prepared from 1, 1, 3, 3-tetramethyldisiloxane and an intermediate product through a hydrosilylation reaction; the intermediate product is prepared from 10-undecylenic acid and alkyl polyol through an esterification reaction. By introducing the temperature-resistant plasticizer and the modified filler, the problems of plasticizer migration and short service life of the existing PPS-based cable sheath material are solved, and the temperature resistance of the existing PPS-based cable sheath material is lower than the high temperature resistance of PPS.

This invention belongs to the field of rubber, specifically relating to a natural rubber material for tank road wheels and its preparation method. The natural rubber material for tank road wheels comprises the following raw materials: natural rubber, zinc 10-undecenoate, aluminum acrylate, methyl 4-vinylbenzoate, benzoyl peroxide, modified carbon black, modified short-cut carbon fibers, stearic acid, antioxidant, aluminum hydroxide, dibutyl phthalate, and sulfur. The rubber material prepared by this invention has a Shore A hardness of 58-60, a tensile strength as high as 37.54 MPa, and elongation at break and stress at 300% elongation can reach 547.26% and 9.65 MPa, respectively. It exhibits excellent comprehensive performance and has good application potential in materials such as tank road wheel tracks.

The invention relates to a bio-based thermoplastic long-chain polyamide elastomer and a preparation method and application thereof, and belongs to the technical field of vegetable oil functional polymer materials. Aiming at the defects of high hardness, complex preparation process and low bio-based content of the existing polyamide elastomer, the elastomer is prepared by taking long-chain binary acid containing a bio-based S28s diacid monomer and a S28so diacid monomer as raw materials, matching with short-chain diamine, diamine with side groups, polyether amine and a catalyst and carrying out melt polycondensation through a one-step method; wherein the S28s and the S28so are synthesized from 10-undecylenic acid and a corresponding sulfur-containing monomer through a sulfur-alkene click reaction, and the S28so is preferably matched with polyether amine with the number-average molecular weight of 400-900. The bio-based content of the elastomer is larger than or equal to 60%, the shore hardness is 25-40 D, the highest elastic recovery rate can reach 84.3%, pre-salification is not needed in the process, and the elastomer can be used for spinning preparation of elastic fibers, automobile engine sealing rings or high-end running shoe sole foaming materials and has the advantages of greenness, high performance and industrialization value.

The present invention discloses a process for preparing undecylenic acid by microwave heating enzymatic hydrolysis under negative pressure, that is, water and methyl undecylenate are enzymatically catalyzed to hydrolyze into undecylenic acid and methanol under microwave heating and negative pressure conditions. This process uses biological enzymes as catalysts, shortening the process of traditional saponification and acidification processes, improving the reaction rate and selectivity. At the same time, the mild reaction conditions are more friendly to equipment and the environment; under negative pressure conditions, the removal of methanol is accelerated, effectively improving the reaction rate and conversion rate of hydrolysis; the use of the thermal effect and non-thermal effect of microwave heating improves the reaction rate and conversion rate. The reaction temperature is only 40 °C, the reaction time is 2 hours, and the conversion rate reaches more than 95%. At the same time, the energy consumption of the process is also relatively low. The present invention provides a new process for preparing undecylenic acid, effectively improving the reaction rate and conversion rate, and achieving the purposes of energy conservation, consumption reduction and environmental protection in the process.