122 results about "Dibasic acid" patented technology

The invention discloses a puncture-resistant packaging film and a preparation method thereof. The packaging film comprises a polyamide layer; the polyamide layer is prepared from the following raw materials in parts by mass: 70 to 90 parts of polyamide, 20 to 30 parts of modified polyamide and 5 to 10 parts of modified filler; the modified polyamide is prepared by the method comprising the following steps: carrying out condensation polymerization on a mixed monomer containing diamine, dibasic acid and polybasic acid to obtain a polyamide prepolymer; wherein the molar weight of the polybasic acid accounts for 5-10% of the total mole number of the dibasic acid and the polybasic acid; the preparation method comprises the following steps: carrying out melt esterification reaction on a polyamide prepolymer and polyester diol in a mass ratio of (10-25): (75-90) in the presence of a catalyst, and reacting a terminal hydroxyl group of the polyester diol with a carboxyl group of the polyamide prepolymer to obtain the modified polyamide. The problems that the polyamide material is high in rigidity and poor in puncture resistance can be effectively solved.

The invention provides a repairing method suitable for an engine case connecting bolt. The method comprises the following steps that S1, chemical stripping and fine treatment are conducted on the connecting bolt, an old plating layer on the surface of the connecting bolt is removed, and the surface of the connecting bolt is evenly coarsened; s2, a nitric acid-phosphoric acid binary acid system is adopted to conduct soaking treatment on the connecting bolt treated in the step S1 at the normal temperature, and a passive film on the surface of the connecting bolt is removed; s3, the connecting bolt treated in the step S2 is subjected to chemical nickel plating; and S4, the connecting bolt treated in the step S3 is subjected to hot water stabilization and dehydrogenation treatment, and the repaired connecting bolt is obtained. The invention provides a set of process from old plating layer removal, passive film removal and chemical nickel plating to hydrogen brittleness avoidance, so that the whole repair process is highly controllable, the product quality is stable and repeatable, and the problem of batch scrapping caused by batch difference and process uncontrollability in the prior art is solved.

The application relates to a renewable and recyclable tourniquet and a preparation method thereof, and belongs to the technical field of tourniquet preparation. The tourniquet comprises the following raw materials in parts by weight: 70-95 parts of PBAT, 15-35 parts of a bio-based toughening agent, 10-20 parts of polyethylene, 5-10 parts of a modified inorganic filler, 1-3 parts of an antioxidant and 1-3 parts of a lubricant; the bio-based toughening agent is made from bio-based dibasic acid and bio-based trihydric alcohol through hyperbranched reaction. The bio-based toughening base, polyethylene and modified inorganic filler are introduced, the toughness of the PBAT base material is improved, the elastic performance of the obtained composite material is improved, and the obtained tourniquet meets the use requirements during hemostasis.

This invention discloses a method for preparing low-density, high-filler SPC flooring. The method is characterized by a raw material formulation comprising the following components in the indicated weight proportions: 100 parts graft-modified PVC resin, 300-350 parts filler, 9-12 parts heat stabilizer, 3-5 parts melt processing modifier, 3-5 parts reinforcing and toughening modifier, 1-2 parts external lubricant, 1-2 parts internal lubricant, 2-5 parts chemical foaming agent, and 2-5 parts foaming aid. The graft-modified PVC resin is prepared by replacing the chlorine atoms in PVC with p-aminothiophenol, followed by an amidation reaction between a diacid or polyacid and an amino group. Its advantages are: 1) It improves the melt strength and expandability of the PVC resin, ensuring foaming performance under high filler content. Compared with ordinary SPC flooring, the flooring product has lower density and lighter weight, higher hardness, and lower overall formulation cost compared to ordinary low-density SPC flooring. 2) The process is simple, and the product has high controllability.

The invention provides a method for preparing alpha, omega-binary acid by decommissioning polyolefin cracking based on stage oxidation, which comprises the following steps: in the absence of a catalyst or in the presence of a catalyst, mixing decommissioning polyolefin with water to form a dispersion system, and reacting at the temperature of 100-200 DEG C and the partial pressure of oxidant gas of 0.1-5.0 MPa to prepare alpha, omega-binary acid. The method comprises the following steps: introducing oxidant gas into a high-pressure closed reactor, carrying out a stirring reaction to obtain small-molecular carboxylic acid, carrying out oxidation treatment on the small-molecular carboxylic acid by using nitric acid to obtain alpha, omega-dibasic acid with a carbon atom number of 4-10, and efficiently preparing high-purity alpha, omega-dibasic acid with a carbon atom number of 4-10. And [omega]-binary acid.

The invention discloses an optical encryption film material as well as a preparation method and application thereof, and the preparation method of the optical encryption film material comprises the following steps: uniformly mixing terephthalic acid, aliphatic dibasic acid and water to obtain a mixed aqueous solution; under the stirring action, 1, 5-pentamethylene diamine is slowly and dropwise added into the mixed aqueous solution, and a transparent salt solution is obtained; carrying out condensation polymerization reaction on the transparent salt solution to obtain nylon synthetic resin; preparing the nylon synthetic resin into a film; and carrying out two-way stretching on the film to obtain the optical encryption film material. The preparation method of the optical encryption thin film material is simple and low in cost, and the optical encryption material with higher cost performance can be prepared.

A ceramic scintillator array 1 according to an embodiment of the present invention is provided with a plurality of scintillator segments 2 and a reflective layer. The reflective layer contains a resin composition. The resin composition contains a transparent resin and an additive. Dibasic acid esters serve as the additive.

The invention provides a bio-based dual-dynamic network polymer as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing an epoxy monomer, binary acid, graphene and a transesterification catalyst, and heating for polymerization reaction to obtain a prepolymer; wherein the epoxy monomer comprises polyethylene glycol diglycidyl ether and glycerol triglycidyl ether, and the binary acid comprises sebacic acid, 2, 5-furandicarboxylic acid and 2, 2 '-dithiodibenzoic acid; and S2, removing bubbles from the obtained prepolymer, and then carrying out thermocuring to obtain the bio-based dual-dynamic network polymer. The bio-based dual-dynamic network polymer obtained by the invention has good mechanical properties, hydrophobicity, solvent resistance, alkali recoverability, self-healing and shape memory properties, and has certain application potential in the fields of intelligent actuators and flexible sensors.

The invention relates to a method for extracting refined long-chain dicarboxylic acid by adopting a mixed solution of a water-soluble organic solvent and water. The method comprises the following steps: directly acidifying and filtering fermentation liquor to obtain a long-chain dibasic acid filter cake containing zymophyte, heating and dissolving the filter cake in a mixed solution composed of a water-soluble organic solvent and water, decolorizing and filtering, cooling and crystallizing, separating and washing, and dehydrating and drying to obtain a long-chain dibasic acid refined product meeting the high-quality requirement. The method is short in process route, low in energy consumption, environment-friendly and low in cost.

The invention belongs to the technical field of polyester materials, and particularly provides a bio-based flame-retardant polyester material and a preparation method thereof.The preparation method comprises the following steps that S1, bio-based dibasic acid, dihydric alcohol, a flame-retardant modifier and a first catalyst react for 3-5 h at the temperature of 180-250 DEG C, and a first product is obtained; s2, the first product obtained in the step S1 and a second catalyst react for 3-10 h at the temperature of 200-300 DEG C under the pressure of 20-50 Pa, and the bio-based flame-retardant polyester material is obtained. According to the polyester material, biomass raw materials are preferably selected, and the polyester material has excellent flame retardant property and mechanical property.

The invention relates to a polyester material, a preparation method thereof and an antibacterial product. The polyester material comprises a polyester main chain and antibacterial peptide; the polyester main chain is prepared from the following raw materials: dibasic acid and / or dibasic ester and dihydric alcohol; the dibasic acid comprises terephthalic acid, and the dibasic ester comprises terephthalic acid ester; the antibacterial peptide is prepared through a ring-opening polymerization reaction of amino-acid ester-N-carboxy anhydride. According to the polyester material, the heat resistance and the optical performance are further improved while good antibacterial performance is achieved.

This invention discloses a bio-based environmentally friendly crosslinking agent and its preparation method, as well as epoxidized natural vulcanizates and their preparation methods and applications, relating to the field of polymer materials technology. This invention successfully synthesizes anhydrides with terpene compounds as the matrix as crosslinking agents. These anhydrides, as bio-based compounds, are not only green, environmentally friendly, and non-toxic, but also, when combined with crosslinking accelerators, can achieve highly efficient crosslinking of ENRs. The amount used is significantly reduced compared to crosslinking methods using diacids, and the crosslinking accelerators used are tertiary amine salts and other salt compounds, which have advantages such as low odor, low volatility, and easy dispersion, and will not cause harm to researchers and the environment like DMI catalysts. Simultaneously, it can also give ENRs excellent mechanical and damping properties. This invention provides a non-toxic, harmless, and environmentally friendly crosslinking agent that can efficiently crosslink rubber and introduce dynamic covalent bonds into the crosslinking network to achieve a green crosslinking method for reprocessable rubber.

This invention belongs to the field of coal seam development technology and discloses a coal seam wetting reversal agent and its preparation method. The coal seam wetting reversal agent provided by this invention exhibits excellent pH-affected behavior, and the wettability of the coal sample surface by the surfactant EBMAA-DMA12 can be altered by adjusting the pH value of the solution. When the solution pH is less than 6.87, it helps reduce capillary forces and can be used as a water-locking agent. When the pH of the surfactant solution is adjusted to greater than 6.87, it helps reduce the surface free energy of the coal seam and can be used as a coalbed methane desorbent. Furthermore, the method for preparing this coal seam wetting reversal agent involves first synthesizing the dicarboxylic acid intermediate N,N′-ethylenebismaleamic acid (EBMAA) using MAH and EDA, and then obtaining it through a neutralization reaction between N,N′-ethylenebismaleamic acid (EBMAA) and N,N-dimethyldodecylamine. This preparation method uses readily available raw materials, has a simple process, high repeatability and stability, and has significant potential for widespread application.

The invention discloses a polyamide composite material as well as a preparation method and application thereof. The polyamide composite material comprises the following components in parts by weight: 90-150 parts of semi-aromatic polyamide; 30 parts of aliphatic polyamide; 60-90 parts of a reinforcing filler; wherein the semi-aromatic polyamide contains a structural unit derived from aromatic diamine and a derivative thereof and a structural unit derived from aliphatic dibasic acid; the aliphatic polyamide contains a structural unit derived from binary acid with the carbon atom number of 6-10 and a derivative thereof and a structural unit derived from aliphatic diamine, or a structural unit derived from lactam with the carbon atom number of 6-10 or aliphatic amino carboxylic acid; the average retention length of the reinforcing filler is 600 to 900 [mu] m. According to the polyamide composite material disclosed by the invention, specific semi-aromatic polyamide and aliphatic polyamide are compounded, and the dosage of each component is adjusted, so that the prepared polyamide composite material has relatively good fastening force and appearance performance.

An EPDM composition that is a rubber composition in which ethylene-propylene-diene terpolymer rubber is compounded with carbon black, a plasticizer, and a crosslinking agent, wherein the plasticizer is a polyol ester, which is a reaction product of a neopentyl type polyol and a monocarboxylic acid, and the amount of the plasticizer in the composition is 5 to 22 wt. %. The EPDM composition has excellent effects that kneadability and processability are not impaired, and that in terms of hardness changes after a heat aging test, the resulting crosslinked product is equivalent to when the same amount of an α-olefin oligomer is compounded, and is significantly improved compared to when an aliphatic dibasic acid ester is compounded.

This invention belongs to the field of nylon polymers and discloses a low-temperature preparation method for high-temperature resistant semi-aromatic polyamide, including the following steps: (1) Weigh diacid, diamine, antioxidant, catalyst and deionized water according to the designed molar number, add the raw materials to a high-temperature and high-pressure polymerization reactor, the predetermined temperature of the polymerization reactor is 190-230℃, the pressure is raised to the first predetermined pressure of 1.2-2.6MPa, and the temperature and pressure are maintained for 0.5-3h. The pressure inside the reactor is gradually reduced to the second predetermined pressure of 0.5-1.0MPa by venting, and the venting time is 0.5-3h. Finally, the prepolymer is sprayed out from the bottom of the polymerization reactor to obtain a loose porous dry powder / small particle prepolymer, and there is no prepolymer residue in the reactor; (2) The prepolymer obtained above is subjected to solid-phase post-polymerization in a solid-phase post-polymerization reactor to obtain a high-temperature resistant semi-aromatic polyamide final polymer with a relative viscosity of 2.0-5.0. The method of this invention is suitable for preparing high-temperature resistant semi-aromatic polyamides with different compositions. The resulting prepolymer has a loose and porous powder / small particle structure, which provides a favorable channel for the discharge of water molecules, a byproduct of the solid-state polymerization reaction. This can significantly improve the efficiency of solid-state polymerization, shorten the polymerization time, and reduce energy consumption.

This invention belongs to the field of polymer synthesis materials technology, specifically relating to a long-chain semi-aromatic MXD nylon material and its preparation method. The material is made from components comprising the following weight percentages: m-phenylenediamine 31%-41%, long-chain dicarboxylic acid 59%-69%, nucleating agent 0.05%-0.1%, catalyst 0.03%-0.05%, antioxidant 0.03%-0.05%, and solvent 100%-200%; the long-chain dicarboxylic acid is selected from C... 10 -C 18 This invention relates to a series of dicarboxylic acids. Through molecular structure design, synergistic additives, and process optimization, the prepared MXD nylon material achieves a synergistic balance of ultra-low water absorption, high barrier properties, and high toughness, overcoming the shortcomings of traditional MXD6, such as high brittleness and high water absorption. The process is green and environmentally friendly, with excellent processing performance, and can be widely used in high-barrier packaging, automotive, and electronic and electrical fields.

This invention discloses a heat-resistant polymer, its preparation method, and the application of cyclic imide diol compounds, belonging to the field of polymer materials. The polymer comprises a segment (I) containing a cyclic imide, a segment (II) containing a cyclic compound, and an optional third segment (III); wherein the segment (I) containing the cyclic imide can improve the heat resistance of the polymer, and its structure is such that R1 is a residue of an easily cyclized diacid, and R2 is a residue of an amino-containing diol. The heat-resistant polymer of this invention has improved heat resistance and good mechanical properties.

The application discloses a polypropylene resin and a preparation method and polypropylene material thereof. The polypropylene resin is a binary copolymer of propylene and 1-hexene, and the impact strength at -20 DEG C is 3-7 KJ / m 2 . The polypropylene resin is prepared by a solution polymerization method, and a Ziegler-Natta catalyst containing titanium is used, including a main catalyst, a cocatalyst and an external electron donor. The internal electron donor in the main catalyst includes a dibasic acid ester compound and a 1,3-diether compound. The polypropylene resin itself has high low-temperature impact strength and low haze. By adding an antioxidant, an acid remover and a transmittance enhancer into the polypropylene resin base at the same time, the prepared polypropylene material has the characteristics of high low-temperature impact strength, high transparency and low ash content, and can meet the preparation of injection-molded products in the fields of medical tube materials, medical packaging and food packaging, etc. which have high requirements on low-temperature impact and transparency.

The application discloses an unsaturated polyester resin for an open molding process and a preparation method thereof, and relates to the technical field of high polymer materials.The resin comprises an unsaturated polyester base resin, a composite crosslinking monomer, a film forming inhibitor and a core-shell structure toughening agent; the base resin is formed by polycondensation of an unsaturated dibasic anhydride, a saturated dibasic acid and a dibasic alcohol according to a molar ratio of 0.5-0.7:0.3-0.5:1.05-1.15; the composite crosslinking monomer comprises styrene and a high-boiling-point crosslinking monomer, and the mass ratio of the two is 20-40:60-80; and the film forming inhibitor is a long-chain alkyl modified polysiloxane.The application solves the problem that low volatility and high toughness are difficult to be considered simultaneously by synergistically reducing volatilization of the high-boiling-point monomer and the surface barrier and synergistically toughening by flexible molecular chain design and the core-shell particle, and significantly improves the working environment and improves the durability of products.

The application discloses a copolymer and a preparation method thereof, and belongs to the technical field of polymer synthesis. The copolymer comprises a polymer main body structure unit and a structure unit for improving the strength of the polymer, and the side chain group of the structure unit for improving the strength of the polymer contains an imide ring structure (R-0):(R-0), wherein R1 is a residue of an easy cyclization dibasic acid.

The application provides a heterocyclic dibasic acid containing a non-polar hydrophobic group and a preparation method and application thereof. The heterocyclic dibasic acid has a structure shown in formula 1, wherein Y is a substituted or unsubstituted heterocyclic group, R1 and R2 are independently selected from H, a substituted or unsubstituted straight chain or branched alkyl group, a substituted or unsubstituted aryl group or a heterocyclic group, and the value range of m and n is independently selected from an integer between 0 and 9. The heterocyclic dibasic acid has the advantages of good biocompatibility, low toxicity, degradability and the like, and is used for synthesizing an environment-friendly plasticizer.

The invention belongs to the technical field of high polymer materials, and relates to a preparation method and application of an ultraviolet aging resistant polyether ester elastomer, the preparation method comprises the following steps: firstly, carrying out esterification reaction or ester exchange reaction on 1, 4-cyclohexanedimethanol and an oxalic acid compound to obtain hydroxyl-terminated oxalate; mixing the hydroxyl-terminated oxalate with an aromatic dibasic acid compound, aliphatic dihydric alcohol, polyether glycol, a catalyst and an antioxidant, and sequentially performing esterification reaction, pre-polycondensation reaction and final polycondensation reaction to obtain the ultraviolet aging resistant polyether ester elastomer. Wherein the oxalic acid compound is oxalic acid or ester of oxalic acid; the aromatic dibasic acid compound is aromatic dibasic acid or ester of the aromatic dibasic acid. Compared with the prior art, the preparation method disclosed by the invention has the characteristics of simple preparation process and good ultraviolet aging resistance, a sample is placed in an ultraviolet aging test box to be irradiated for 30 days, the optimal tensile strength reduction percentage is 38.9% which is lower than 48.5% of the tensile strength before hydroxyl-terminated oxalate copolymerization, and the ultraviolet aging resistance is obviously improved.

The invention provides a carbonized resin decolorizing and refining method for mixed dibasic acid dimethyl ester, and belongs to the technical field of chemical separation and purification. According to the technical scheme, spherical carbonized resin formed by carbonizing styrene-divinyl benzene polymer resin is used as an adsorbent, and a colored crude product DBE is subjected to decoloration treatment through a fixed bed process. The carbonized resin has extremely high selective adsorption capacity and adsorption rate on colored impurities in DBE, the Pt-Co color number of the carbonized resin can be reduced from 50 or above to 10 or below, the decolorization rate exceeds 80%, and meanwhile the yield of the DBE product reaches 99% or above. And the resin saturated by adsorption is easy to regenerate and can be repeatedly used. The method is simple in process, efficient and environment-friendly, overcomes many defects of a traditional activated carbon decoloration method, and is particularly suitable for industrial refining production of DBE.

The invention relates to the technical field of powder coatings, in particular to a low-temperature curing environment-friendly highlight powder coating and a preparation method thereof. The coating prepared by the invention overcomes the problems of poor curing property and poor environmental protection property. The coating comprises carboxyl-terminated hyperbranched polyester, epoxy resin, crystalline binary acid, a microcapsule accelerator and a modified inorganic filler. The microcapsule is prepared by adopting a dimethyl carbonate green solvent and a reduced-pressure recovery process, so that formaldehyde and VOCs (Volatile Organic Compounds) residues are completely eradicated from the source; the bottleneck of low-temperature leveling is broken through by utilizing an instantaneous low-viscosity effect generated by synergism of a hyperbranched structure and a crystallization auxiliary agent; the superfine filler is activated in situ through the titanate coupling agent, interface defects are eliminated, and the impact resistance is enhanced. The coating has excellent storage stability and 130 DEG C rapid curing capacity, and a coating film shows high gloss and high distinctness of image and meets the strict environmental protection standard.

This application belongs to the technical field of chemical machinery and equipment, specifically relating to a system for recovering and purifying dicarboxylic acid from adipic acid production waste liquid. The system includes: a rising film evaporator, a separator, a dicarboxylic acid recovery crystallization unit, a centrifugal separator, a decolorizing tank, and a dicarboxylic acid evaporation and slaking unit, connected sequentially by pipelines. This application, through appropriate concentration (increasing the material concentration entering the dicarboxylic acid evaporation and slaking system from the existing 20% ​​to 50%), cooling centrifugation, and dissolution decolorization, can further improve and enhance the quality of DBA finished products. Preliminary application results, combined with adjustments to relevant process parameters, show that the purity of the existing finished product (approximately 99.3%) can be further increased to 99.7%, and the nitric acid content (0.5%) and water content (0.5%) of the existing finished product can be further reduced to nitric acid ≤0.1% and water ≤0.3%, which has significant technical implications for improving the quality and value of DBA products.

The application relates to the technical field of organic synthesis, and particularly relates to a preparation method of omega-amino fatty acid methyl ester and long-chain nylon. The preparation method of the omega-amino fatty acid methyl ester specifically comprises the following steps: S1, ester exchange: long-chain dibasic acid dimethyl ester, methanol and a first organic solvent are mixed in the presence of a first catalyst, and the long-chain dibasic acid monomethyl ester is obtained through an ester exchange reaction; S2, ammonia addition: the long-chain dibasic acid monomethyl ester is used as a raw material, an amidation reaction is carried out, and then a reduction reaction is carried out to obtain the omega-amino fatty acid methyl ester, wherein n is greater than or equal to 8. The preparation method has the characteristics of a short process route and stable intermediates, can be suitable for batch production, and can also be suitable for continuous production.

The invention discloses a process for separating glutaric acid from an adipic acid byproduct, and belongs to the technical field of chemical separation. The process comprises the following steps: adsorbing a mixed binary acid solution by resin to remove a catalyst, sequentially carrying out rising-film evaporation and falling-film evaporation concentration, carrying out primary crystallization on a concentrated solution at 20-23 DEG C to separate succinic acid and adipic acid so as to obtain a mother solution rich in glutaric acid, carrying out rising-film evaporation concentration on the mother solution, feeding the mother solution into a multi-chamber series-connected adiabatic evaporation crystallizer, and carrying out vacuum distillation to obtain the glutaric acid. The final crystallization temperature is controlled to be 4-10 DEG C under the gradient vacuum condition, meanwhile, a seed crystal reflux technology is adopted, glutaric acid wet crystals are obtained through separation after crystallization is completed, and glutaric acid products are obtained through drying. The purity of glutaric acid in the glutaric acid product can reach 95% or above, the yield reaches 90% or above, and the method has remarkable industrial application value.

The invention provides UV-cured bio-based polyester acrylate as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out polycondensation on bio-based dibasic acid and dihydric alcohol under the catalysis of organic bismuth and the protection of nitrogen at 150-230 DEG C to obtain a polyester intermediate with the molecular weight of 500-2000; then, in a nitrogen environment, reacting the intermediate with an acrylic monomer and a polymerization inhibitor under the action of a catalyst at 110-120 DEG C until the acid value of the system is reduced to 8-15 mgKOH / g; and cooling to 70-80 DEG C, adding the gingerol derivative polymerizable functional monomer, and continuously reacting until the acid value is lower than 5mgKOH / g, thereby obtaining the target product. According to the invention, gingerol is grafted to a polyester acrylate side chain through a covalent ester bond in a form of a polymerizable monomer, so that migration and loss of gingerol are avoided. And meanwhile, phenolic hydroxyl groups of gingerol are subjected to esterification packaging, so that high-efficiency proceeding of a curing reaction is guaranteed.

The invention discloses a high-lubricity cutting fluid and a preparation method thereof in the technical field of metal processing lubricants, and the cutting fluid is based on deionized water and comprises triethanolamine, an antirust agent, dodecanedioic acid, polyether and a defoaming agent. And two key inorganic modified additives: surface amino functionalized fluorinated hexagonal boron nitride and zinc ion intercalation modified graphite phase carbon nitride. The preparation method comprises the following steps: firstly preparing a premixed solution containing water, triethanolamine, the antirust agent, dodecanedioic acid and polyether, then adding the two inorganic modified additives, performing ultrasonic treatment and uniform dispersion, and finally adding the defoaming agent and filtering to obtain a finished product. Through the synergistic effect of two uniquely designed inorganic compounds, the cutting fluid has excellent lubricity, long-acting antibacterial property and broad-spectrum corrosion inhibition at the same time, is especially suitable for precise and high-speed processing of various materials, and is environment-friendly and easy to process.