18 results about "BPDA" patented technology

The application discloses a synthesis method of 2,3,3',4'-biphenyl tetracarboxylic dianhydride, characterized in that 2,3-dimethylaniline is used as a starting raw material, 2,3-dimethylaniline diazonium salt is prepared through a diazotization reaction, then 2,3,3',4'-tetramethyl biphenyl is prepared through a coupling reaction of the 2,3-dimethylaniline diazonium salt and o-xylene under the catalysis of cuprous chloride, and finally 2,3,3',4'-biphenyl tetracarboxylic dianhydride is prepared through an oxidation reaction and dehydration to form anhydride. The coupling reaction in the synthesis method has good selectivity, 3,3,4',4'-tetramethyl biphenyl which is difficult to separate is not generated, high-purity a-BPDA can be finally obtained, and the coupling reaction in the synthesis method only needs to use low-cost cuprous chloride as a catalyst, so that the production cost is greatly reduced compared to a high-cost catalytic system in the prior art, and the synthesis method is more suitable for industrial mass production.

The present invention provides a polyimide film and a method for manufacturing the polyimide film, wherein the polyamic acid solution is obtained by imidizing a dianhydric acid component comprising two or more selected from the group consisting of benzophenone tetracarboxylic dianhydride (BTDA), biphenyltetracarboxylic dianhydride (BPDA), and pyromellitic dianhydride (PMDA), and a diamine component comprising paraphenylene diamine (PPD), wherein, based on a total content of 100 mol% of the diamine component, the content of paraphenylene diamine is 70 mol% or more and 100 mol% or less, and based on a total content of 100 mol% of the dianhydric acid component, the content of biphenyltetracarboxylic dianhydride is 50 mol% or more and less than 100 mol%, the dielectric loss rate (Df) is 0.003 or less, and the light transmittance at a wavelength of 550 nm is 15% or more and 50% or less.

This invention provides a flexible biomass RTP thin film material, its preparation method, and its application. The thin film material comprises a biomass substrate and luminescent functional molecules dispersed in the biomass substrate. The biomass substrate includes starch, sodium carboxymethyl cellulose, and a polyol plasticizer. The luminescent functional molecules are selected from at least one of ODQA, BPDA, TDCA, BDF, TPO, QBA, and BBA, and the loading amount of the luminescent functional molecules in the biomass substrate is 0.1wt% to 5wt%. The thin film material exhibits room temperature phosphorescence properties and an elongation at break ≥15%. This invention simultaneously achieves efficient room temperature phosphorescence (RTP) emission and excellent macroscopic mechanical flexibility in a biomass substrate.

A polyimide composition comprising particles of a polyimide polymer derived from (i) ODA, (ii) PMDA, (iii) PPD, and (iv) BPDA monomers wherein when the polyimide composition consists of particles of a polyimide polymer, the polyimide composition has an apparent density of < = 0.25 g / cm3.

The application provides a preparation method of a UiO-66-NH2-based mixed matrix membrane, which comprises the following steps: 3,3',4,4'-diphenyltetracarboxylic dianhydride is prepared by adding 4-chloro-N-methyl phthalimide, a catalyst A, a reducing agent and an additive into an aprotic solvent; then UiO-66-NH2 is added into the reaction system to obtain anhydride-capped UiO-66-NH2 (BPDA); UiO-66-NH2 (BPDA), BPDA and ODA are added into DMAC, a dehydrating agent and a catalyst B are added to obtain BPDA-ODA type polyimide containing UiO-66-NH2; and the BPDA-ODA type polyimide containing UiO-66-NH2 and DMAC are configured into a casting solution to obtain a mixed matrix membrane UiO-66-NH2 / BPDA-ODA-N. Compared with the traditional direct doping method for preparing the mixed matrix membrane, the preparation method greatly improves the doping amount of UiO-66-NH2, which makes the permeation flux of CO2 further improved while the selectivity of retaining CO2 is reserved, and the CO2 separation performance is more excellent.

This invention discloses an amino-functionalized ZIF-8 modified polyimide composite film and its preparation method, belonging to the field of polyimide film technology. The process involves a binary copolymerization reaction of p-phenylenediamine (p-PDA) and biphenyl tetracarboxylic anhydride (BPDA) to obtain a polyamic acid (PAA) solution. Then, amino-functionalized ZIFs (ZIF-8-NH2) are ground and thoroughly mixed with a solvent. After ultrasonic extraction, the mixture is introduced into the aforementioned PAA solution to obtain a PAA / ZIF-8-NH2 composite liquid. After adjusting the molar ratio of the dianhydride and undergoing thermal imidization treatment, the amino-functionalized ZIF-8 modified polyimide composite film is obtained. This invention introduces ZIF-8, which possesses high porosity, large specific surface area, adjustable pore structure, excellent thermal stability, and low thermal conductivity, into the composite film preparation process. Based on this, the ZIF-8 is amino-functionalized, resulting in a composite film material with uniform filler dispersion, ultra-low dielectric constant, low dielectric loss, and excellent thermal insulation performance.

The application discloses a kind of multilayer polyimide film and its preparation method and application, belong to high-performance polyimide technical field, solve the problem that PI film in prior art is not ideal when being applied to flexible PI board Heat stability.The method comprises: ODA, GAPD and DMAc are mixed under ice bath, after mixing BPDA and TAHQ, it is added in batches, to obtain solution B;SiO2 Aerogel is added to anhydrous ethanol, ultrasonic is obtained at room temperature, to obtain solution C;Solution B is coated into thin film, after drying, solution C is coated on it, after drying, solution B is coated on it again, drying is obtained Polyimide film.The multilayer low-dielectric polyimide film prepared by the application has the advantages of low dielectric, high temperature resistance, high interfacial compatibility and low water absorption.

This invention provides a multilayer polyimide film with excellent heat resistance, low dielectric loss tangent, and dimensional stability. The multilayer polyimide film comprises a heat-resistant polyimide layer and a heat-fusion polyimide layer laminated on one or both sides; the heat-resistant polyimide is obtained from a tetracarboxylic acid component containing more than 75 mol% of 3,3',4,4'-biphenyltetracarboxylic dianhydride (s-BPDA) and less than 25 mol% of pyromellitic dianhydride (PMDA), and a diamine component containing 70 mol% to 95 mol% of p-phenylenediamine and 5 mol% to 30 mol% of 2,2'-dimethylbenzidine; the heat-fusion polyimide is obtained from a tetracarboxylic acid component containing 10 mol% to 60 mol% of s-BPDA and 40 mol% to 90 mol% of PMDA, and a diamine component containing more than 50 mol% of 2,2-bis[4-(4-aminophenoxy)phenyl]propane.

The application discloses a high-strength plasticization-resistant gas separation membrane, a preparation method and application. By introducing a rigid group BPDA (3,3',4,4'-biphenyl tetracarboxylic dianhydride) with good crystallinity, PMDA (1,2,4,5-benzene tetracarboxylic dianhydride) and a high-crystallinity aromatic diamine into a 6FDA (hexafluoro dianhydride) and DABA (3,5-diamino benzoic acid) system, the flowability of a polymer chain is reduced, and the plasticization resistance and mechanical strength of the polymer are improved. In order to improve the solubility of monomers, a polyimide represented by a general formula (I) is obtained by dissolving a polymerization system by using a phenol as a solvent. The hollow fiber membrane prepared by spinning the obtained polyimide has the advantages of high strength, plasticization resistance and the like in a gas separation process, has good thermal stability, improves the permeation rate, and can maintain good selectivity for CO2 / N2 and CO2 / CH4, and has an important role in the field of flue gas and biogas CO2 removal. n is the polymerization degree of different components of the polymer, n is an integer of 100-200, and x is the mole ratio of the DABA part, x is an integer of 0-100.

The invention relates to the technical field of polyimide resin, in particular to modified polyimide resin for a glass fiber composite material as well as a preparation method and application of the modified polyimide resin. The preparation raw materials comprise a dianhydride monomer, a diamine monomer, an end-capping reagent, a filler and a solvent. The binary anhydride monomer comprises BPDA and ODPA; the diamine monomer comprises TFDB and TPE-R. The invention also discloses a preparation method of the diamine monomer. A quaternary copolymerization system constructed by binary anhydride monomers (BPDA and ODPA) and diamine monomers (TFDB and TPE-R) can improve the heat resistance and mechanical properties of the prepared resin; the weight ratio of BPDA to ODPA is 4: (0.5-2), and the weight ratio of TFDB to TPE-R is 1: (3-5), so that the toughness of the prepared resin can be further improved, and the elongation of the resin is greater than or equal to 25%.

The invention discloses a polyimide fiber as well as a preparation method and application thereof. The fiber adopts a'core layer-shell layer 'double high-heat-resistant cross-linked structure, a core layer and a shell layer both select a weak-bond-free high-rigidity heat-resistant monomer system, and the fiber is formed by copolymerization of a diamine system composed of p-phenylenediamine (PDA) and biphenyl diamine (BZ), a dianhydride system composed of benzene tetracarboxylic anhydride (PMDA) and 3, 3', 4, 4 '-biphenyl dianhydride (BPDA) and a dialkynyl-containing heat-resistant cross-linking agent. The glass transition temperature (Tg) of the fiber is greater than or equal to 320 DEG C, the 5% weight loss temperature (Td5) is greater than or equal to 580 DEG C under the condition that the temperature is increased by 10 DEG C / min in a nitrogen atmosphere, the tensile strength retention rate is greater than or equal to 70% after the fiber is exposed for 600 h in a 300 DEG C air environment, and the fiber has ultrahigh temperature resistance and structural stability and can be widely applied to the fields of aerospace high-temperature parts, electronic and electric power insulation, extreme environment protection and the like.

The application discloses black thermoplastic polyimide and a preparation method and application thereof, and relates to the technical field of polyimide. The application discloses thermoplastic polyimide with a new structure, and the structure of the thermoplastic polyimide is as follows, wherein diamine is ABABP and PNDA; and dianhydride is BPTME and BPDA. The application selects PNDA containing a chromophore group imido (-N-H-), and thus the thermoplastic polyimide with a black appearance is prepared without using black fillers.

The application relates to a two-dimensional covalent organic framework material based on Fe doping and bipyridine ligands, a preparation method and application thereof, and belongs to the technical field of covalent organic framework materials. N,N,N',N'-tetra-(p-aminophenyl)-p-phenylenediamine (TAPD) and 2,2'-bipyridine-5,5'-diformyl (BPDA) are used as ligands to synthesize JLNU-305, and JLNU-305-Fe is obtained after reaction with ferrous sulfate heptahydrate, which has multiple active sites (Fe 2+ , Fe 3+ and pyridine N), and exhibits excellent catalytic performance in the activation of sodium persulfate (PDS) for the degradation of 2,4-dichlorophenol (2,4-DCP) under room temperature conditions. At room temperature, 10mg / L of 2,4-dichlorophenol can be removed at a removal rate of 100% by JLNU-305-Fe in only 8min, and the performance is far superior to that of inorganic or organic porous organic polymers, and the JLNU-305-Fe has good reusability.

This utility model relates to the technical field of screening equipment, specifically to a screening device for preparing BPDA catalyst carriers. A feeding hopper is located at the top of the screening box, and a horizontally placed rotating drum is located below the feeding hopper inside the screening box. A magnetic material is installed inside the rotating drum to adsorb and remove ferromagnetic particles. A horizontally placed rotating roller is located below the first waste plate inside the screening box, and a screen plate is fixedly installed below the rotating roller. Material flowing down one side of the rotating drum falls onto the screen plate via a discharge plate for downward screening. The rotating roller drives a scraper to rotate, which scrapes the material sequentially along the screen plate and the abrasive plate. Part of the material scraped onto the abrasive plate is further crushed and ground by the scraper and abrasive particles before flowing down to the screen plate for screening. The remaining large particles are pushed by the scraper until they fall down along the second waste plate and are discharged, achieving a better screening effect.

Provides a polyimide film and a laminate board thereof, in particular a polyimide film, which includes a 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) component; a pyromellitic dianhydride (PMDA) component; a p-phenylenediamine (p-PDA) component; a 2,2′-dimethyl-4,4′-diaminobiphenyl (m-TB) component and a 4,4′-oxydianiline (ODA) component; and uses BPDA and p-PDA as the copolymerized segments. The polyimide film and the laminate board including the polyimide film have good thermal properties, mechanical properties and adhesion.

The present invention provides a polyamic acid composition for preparing a soluble polyimide solution and a soluble polyimide solution prepared therefrom, the polyamic acid composition comprising a polyamic acid comprising, as polymerization units, a dianhydride monomer and a diamine monomer, wherein the dianhydride monomer includes bisphenol A dianhydride (BPADA) and biphenyl tetracarboxylic dianhydride (BPDA), and the diamine monomer includes 2,2'-bis(trifluoromethyl)benzidine (TFMB).

The present invention provides a blended film with a tensile strength of 130 MPa or more that comprises: a polyamide-imide including, as polymerization units, trimellitic acid anhydride (TMA) and a diisocyanate monomer including at least one selected from the group consisting of methylene diphenyl diisocyanate (MDI), 1,5-naphthalene diisocyanate(NDI), p-phenylene diisocyanate(PPDI), m-phenylene diisocyanate(MPDI), 2,4-toluene diisocyanate(TDI), 3,3'-dimethyl-4,4'-diphenylmethane diisocyanate, 3,3'-dimethyl-4,4'-biphenyl diisocyanate, 4,4'-diphenylisopropylidene diisocyanate, 3,3'-dimethoxy-4,4'-biphenyl diisocyanate, dianisidine diisocyanate, tolidine diisocyanate(TODI), and hexamethylene diisocyanate; and a polyimide including, as polymerization units, a dianhydride monomer including at least one selected from the group consisting of pyromellitic dianhydride(PMDA), biphenyl tetracarboxylic dianhydride(BPDA), and benophenone tetracarboxylic dianhydride(BTDA), and a diamine monomer including at least one selected from the group consisting of 4,4'-diaminodiphenylether (ODA), 4,4'-methylenedianiline (MDA), metaphenylenediamine (MPD), paraphenylenediamine (PPD), and m-tolidine.

The application discloses a high-shielding and high-whiteness polyimide film, which comprises a polyimide polymer obtained by reaction of diamine monomers and dianhydride monomers, wherein the diamine monomers are phenylenediamine (PDA) and 2,2'-bis(trifluoromethyl) benzidine (TFMB), and the dianhydride monomers are 3,3',4,4'-biphenyl tetracarboxylic dianhydride (BPDA); wherein, based on the total moles of the diamine monomers, the PDA is 16-25 mol%, and the TFMB is 75-84 mol%; and a plurality of color-producing fillers distributed in the polyimide polymer. The polyimide has a low gloss of 3-10 GU, and an L* value of 80-90, a b* value of 1.8-5.5, and a transmittance of 3-15%.