216 results about "Dibasic acid" patented technology

The invention relates to the technical field of high polymer materials, and discloses self-repairing bio-based polyester resin for a matte powder coating as well as a preparation method and application of the self-repairing bio-based polyester resin. The bio-based polyester resin is prepared from the following preparation raw materials in percentage by mole: 20 mol% to 40 mol% of bio-based flexible diol, 20 mol% to 35 mol% of bio-based furandicarboxylic acid, 10 mol% to 25 mol% of isosorbide, 5 mol% to 25 mol% of itaconic acid, 1 mol% to 15 mol% of long-chain bio-based aliphatic dibasic acid, 1 mol% to 10 mol% of bio-based citric acid, 0.1 mol% to 2.0 mol% of zinc acetylacetonate, 0.1 mol% to 1.0 mol% of a microcapsule corrosion inhibitor, 0.1 mol% to 1.0 mol% of an esterification catalyst and 0.1 mol% to 1.5 mol% of an antioxidant. The bio-based polyester resin does not contain petroleum-based monomers and is high in biochar content.

The invention discloses a high-barrier material based on a PET aminolysis monomer and a preparation method of the high-barrier material, and belongs to the technical field of high polymer materials. The preparation method comprises the following steps: carrying out aminolysis reaction on polyethylene glycol terephthalate (PET) to prepare a dihydric alcohol monomer containing an amido bond, and carrying out polymerization reaction on the dihydric alcohol monomer and aliphatic dibasic acid to prepare a polyesteramide (PEA) material. The prepared PEA material has excellent oxygen barrier property and toughness, the oxygen barrier property of the PEA material is obviously superior to that of a PET material, and the barrier property and mechanical property of the PEA material can be regulated and controlled by changing the length of a methylene chain segment of the aliphatic dibasic acid monomer. The aliphatic dibasic acid monomer can be derived from biomass resources, the reaction condition is mild, the process is simple, and the method is suitable for industrial large-scale production.

The invention provides a novel hindered amine light stabilizer as well as a preparation method and application thereof, and relates to the field of light stabilizers. According to the preparation method of the novel hindered amine light stabilizer, specific dibasic acid dimethyl ester and 2, 2, 6, 6-tetramethylpiperidinol are used as raw materials, an alkane solvent or a benzene solvent is used as a solvent, and a catalytic reaction solution is obtained through a heating reaction under the condition of a catalyst; and neutralizing and washing the catalytic reaction liquid to obtain the novel hindered amine light stabilizer. According to the preparation method, ideal preparation effects (such as purity, yield and the like) can be achieved, meanwhile, the chroma of the product is effectively reduced, the problem that the product is prone to yellowing due to the fact that the hindered amine light stabilizer absorbs visible light is solved, and the compatibility and stability of the hindered amine light stabilizer and a high polymer material are further improved.

The invention relates to a method for recycling polyethylene plastic through catalytic oxidation cracking, and belongs to the technical field of plastic recycling. The method comprises the following steps: mixing a Co / Al2O3 catalyst, polyethylene plastic and water, and carrying out a catalytic reaction in an oxygen-containing atmosphere at a set temperature, so that the polyethylene plastic is converted into binary acid, thereby obtaining a reaction solution. The low-price Co / Al2O3 catalyst is applied to catalytic oxidation cracking of the polyethylene plastic, the polyethylene plastic is converted into the binary acid, the yield of the binary acid is stabilized at 70% or above and reaches 115% at most, and the Co / Al2O3 catalyst is low in price and low in cost. The low-cost and low-energy-consumption improvement of the yield of the binary acid converted from the polyethylene plastic through catalytic oxidation cracking is fully realized, and a new way is provided for the high-value conversion of the polyethylene plastic.

The invention provides a polyamide elastomer and a preparation method thereof. The method comprises the following steps: (1) under the action of a first catalyst, carrying out condensation polymerization on a poly-diol compound and a binary acid monomer in a solvent to obtain an end-capping reagent; (2) under the action of a second catalyst, an end-capping reagent and a comonomer are subjected to a contact reaction, and a polyamide block is obtained; and (3) in the presence of a stabilizer and under the action of a third catalyst, carrying out contact reaction on the soft segment and the polyamide block to obtain the polyamide elastomer, wherein the polydihydric alcohol compound is polyalkylene ether glycol with the number-average molecular weight of 150-2000, and the stoichiometric ratio of the polydihydric alcohol compound to the binary acid monomer is 1: (2.0-2.4); the comonomer is C4-C12 lactam and / or C4-C12 amino carboxylic acid; and the soft segment is a hydroxyl-terminated diol polymer. According to the invention, the performance loss of the hard-segment-dominated material is not caused on the basis of improving the soft-segment-dominated material mechanical property of the product, and the polyamide elastomer product with excellent comprehensive performance is obtained.

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 belongs to the technical field of polyamide elastomers, and particularly relates to a polyamide elastomer and a method for preparing the polyamide elastomer through a one-pot method. The method for preparing the polyamide elastomer by the one-pot method comprises the following steps: (1) adding diamine, binary acid, polyether, deionized water and an auxiliary agent into a reaction container, carrying out heating reaction for the first time, then discharging to normal pressure, carrying out heating reaction again, and removing water and volatile components; (2) pre-diluting the esterification catalyst, adding the pre-diluted esterification catalyst into the reaction container, stirring, carrying out esterification reaction, then carrying out vacuum polymerization, and discharging and granulating after the reaction end point is reached to obtain a polyamide elastomer material; the one-pot polymerization process disclosed by the invention is beneficial to reducing the phase separation degree of a polyether soft segment and a polyamide hard segment; an esterification catalyst is added in the step (2), so that the phase separation degree of soft and hard segments can be better regulated and controlled, and the product performance is improved.

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 electrodialysis device comprises a membrane stack, electrode plates, fixing plates, a sealing assembly, a transparent baffle and a collecting assembly, the electrode plates are arranged on the two sides of the membrane stack, the fixing plates are arranged on the outer sides of the electrode plates, supports are arranged on the outer sides of the fixing plates, and the sealing assembly is arranged on the outer sides of the fixing plates. The sealing assembly comprises a fixing pipe arranged on the outer side of the fixing plate and an iron cover hinged to the fixing pipe, the transparent baffle is inserted into the fixing plate in a penetrating mode, and the collecting assembly comprises a collecting box arranged at the bottom of the transparent baffle, a discharging pipe arranged at the front end of the collecting box, a valve arranged on the discharging pipe and a liquid level sensor arranged on the inner side of the collecting box. By arranging the transparent baffle and the collecting assembly, under the condition that use of the electrodialysis device is not affected, the effect of conveniently collecting leaked liquid is achieved, whether leakage occurs or not can be monitored, meanwhile, the clamping assembly can be sealed through the sealing assembly, and the situation that the corrosion speed is increased due to the fact that dust and liquid make contact with the clamping assembly is avoided.

The invention belongs to the technical field of high polymer material additives, and particularly relates to a multifunctional additive, a synthesis method thereof and application of the multifunctional additive in PVC (polyvinyl chloride) processing. Modified mannitol and binary acid are used as raw materials for esterification reaction to obtain a product A, the product A and yttrium salt are mixed for reaction to obtain a product B, and the product B and cinnamyl ethyl methacrylate are mixed for free radical reaction to obtain the multifunctional additive. The multifunctional auxiliary agent can be used as a heat stabilizer to improve the thermal decomposition temperature of PVC, can also be used as a light stabilizer to reduce the influence of illumination on PVC, and can be well applied to PVC processing.

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.

The application discloses a heterocyclic dibasic acid containing basic groups and a preparation method and application thereof. The heterocyclic dibasic acid containing basic groups has a structure shown in formula I: wherein Y comprises a substituted or unsubstituted heterocyclic group, and R1 and R2 are independently selected from a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group. The heterocyclic dibasic acid containing basic groups can be used as an important chemical intermediate, and especially can be used as a chain extender for preparing polyurethane and the like.

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 application discloses a diamine containing a DDSQ base element and a preparation method thereof, and belongs to the technical field of gas separation and purification. The preparation method of the diamine containing the DDSQ base element is suitable for synthesizing DSDQ functional molecules with different molecular structures and reaction activities, and meets the polymerization requirements. The preparation method of the polyimide gas separation membrane is as follows: firstly, a nitro aryl amine functional molecule is synthesized; then, the nitro aryl amine functional molecule is reacted with a DSDQ binary anhydride synthesized by using a disclosed technical solution to obtain a double-nitro compound containing the DSDQ; finally, the double-nitro compound is hydrogenated and reduced to obtain a target molecule, namely, a DSDQ diamine. The DSDQ diamine is condensed with a binary anhydride to obtain a polyamide acid precursor, and the polyamide acid precursor is cyclized and dehydrated to obtain a polyimide. Finally, the polyimide gas separation membrane containing the DSDQ base element is obtained by using a dissolving-tape casting method. The separation membrane still has stable gas permeability and relatively constant selectivity after physical aging for 300 days at room temperature, and has outstanding anti-aging performance.

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 discloses an ultraviolet-responsive degradable polyester and a preparation method thereof, the ultraviolet-responsive degradable polyester is a copolyester composed of an aliphatic polyester segment and a photosensitive o-nitrobenzyl ester segment, and the ultraviolet-responsive degradable polyester is prepared by carrying out ring-opening-condensation cascade polymerization on aliphatic cyclic diol diacid ester and o-nitrobenzene dimethanol as monomers. Or dibasic acid, dihydric alcohol and o-nitrobenzene dimethyl carbinol are used as monomers to be prepared through condensation polymerization. The main chain of the polyester contains a photo-response unit based on o-nitrobenzyl ester, intramolecular isomerization can occur under ultraviolet irradiation and causes breakage of a molecular chain, and the molecular weight of the polymer can be quickly reduced in a short time to form a low-molecular-weight degradation product; the degradation product has certain solubility in alcohol, water or alkaline alcohol water solution and the like, and can be dissolved by using the solvent; through the dissolvability difference of an exposed part and a non-exposed part in the solvent, the solvent can be applied to the field of ultraviolet light degradation materials such as photoresists and the like.

The application provides an emulsified cutting fluid, which comprises base oil 30-60 parts, long-chain dibasic acid-amino acid 3-15 parts, long-chain dibasic acid ester 3-20 parts, surfactant 5-20 parts, benzotriazole 0.1-5 parts, bactericide 0-5 parts and water, wherein the long-chain dibasic acid-amino acid is connected with two amino acids at the carboxyl groups at two ends of the long-chain dibasic acid; and the long-chain dibasic acid ester is an alkyd ester compound formed by the reaction of long-chain dibasic acid and long-chain monohydric alcohol. In the cutting fluid, the long-chain dibasic acid-amino acid has high rust resistance and amphiphilicity, and the long-chain dibasic acid ester can improve the stability and rust resistance of the cutting fluid together with the long-chain dibasic acid-amino acid, and the cutting fluid can be widely applied to various metal processing scenes.

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 the technical field of foam materials, in particular to an interpenetrating network cross-linked polyvinyl chloride foam material and a preparation method thereof. Comprising the following components in parts by weight: 60-70 parts of polyvinyl chloride resin, 3-7 parts of dibasic acid ester, 30-40 parts of isocyanate, 5-10 parts of a physical foaming agent, 1.5-3 parts of water, 1-3 parts of a nucleating agent, 0.1-0.3 part of a foam stabilizer, 0.5-1 part of a catalyst, 0-10 parts of hollow glass microspheres and 0.5-5 parts of a processing aid, the physical foaming agent is supercritical gas, and the air pressure is 8.5-15 MPa. The one-step mould pressing supercritical foaming process is adopted, the process is simple, the step that a foaming blank is prefabricated firstly and then cross-linked and foamed in a water area or a steam area in conventional mould pressing chemical foaming can be effectively avoided, the foaming time is short, the yield is large, and the production cost is relatively low.

An environment-friendly cutting fluid comprises, by weight percentage, 2-20% of long-chain dibasic acid-amino acid, 1-20% of amino acid long-chain alcohol ester, 1-20% of glycerol, 0.1-5% of sodium metasilicate and the balance of water, the long-chain dibasic acid-amino acid being obtained by connecting two amino acids to the carboxyl groups at both ends of the long-chain dibasic acid, and the amino acid long-chain alcohol ester being an alcohol ester compound formed by the reaction of amino acid and long-chain alcohol. The combination of the long-chain dibasic acid-amino acid and the amino acid long-chain alcohol ester makes the cutting fluid have strong lubricating performance and be applicable to the processing of aluminum alloy. The long-chain dibasic acid-amino acid and the sodium metasilicate have strong aluminum corrosion inhibition capacity, and their combination can protect the aluminum alloy during use.

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.

The invention provides a polyamide material composition. The polyamide material composition comprises the following components: a) 60-95 wt% of bio-based copolyamide; b) 5-20 wt% of a plasticizer; and c) 0-20 wt% of other additives, wherein the a) bio-based copolyamide comprises amide bonded polyamide units AB and AC derived from monomeric units A, B and C, the monomeric unit A is from pentamethylene diamine, the monomeric unit B is from adipic acid, and the monomeric unit C is from long carbon chain dibasic acid; the other additives c) comprise a flow modifier, a lubricant and a nucleating agent; the sum of the components a), b) and c) is 100% by weight. The polyamide material composition not only has lower water absorption, but also has excellent mechanical property and flame retardant property, is particularly suitable for manufacturing ribbon molded products, and is widely applied to various environmental conditions with harsh requirements.

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.