131results about How to "Disruption of regularity" patented technology

The disclosed preparation method for chitose/chitosan oligosaccharide with low molecular weight as 0.18-15mega and well water-solubility comprises: preparing water-soluble chitosan by acetylization; degrading the product with non-specific hydrolase while controlling the enzyme dosage and reaction time; adjusting the degraded product pH value to 8-9 with KOH or NaOH solution; depositing with ethanol, cleaning, and vacuum drying the final product with free amidogen that can promote wound healing, restrains tumor cell growth and improves human immunity. Compared with prior art, this invention is convenient to control for wide application.

This invention relates to a thermoplastic block copolyether ester elastomer and a preparation method thereof, wherein the aromatic dicarboxylic acid and mixing divalent alcohol are reacted at 180-265 DEG C in the mol ratio of 1: 1.2-2.2; the titanium compound, the mixture of titanium compound and zinc compound or the mixture of titanium compound and magnesium compound is used as catalyst; the copolyether ester contains 15-90ppm of titanium element, 10-200ppm of zinc or magnesium, and 300-4000ppm of antioxidant; the obtained matter is reacted under pressure lower than 150Pa to distil out 1,4-butanediol and 1,4-cyclohexanedimethanol; the final temperature of the reaction is at 260-290 DEG C; in terms of total weight of the copolyether ester, the content of the hard segment is 50-92wt%; the inherent viscosity is 0.65-1.85dl/g; the melting point is at 160-220 degrees centigrade; the elongation at break is 500-1400% and the thermal decomposition temperature is 360 to 450 DEG C.

The invention discloses aliphatic-polyamide-modified copolyester, aliphatic-polyamide-modified copolyester fiber, and preparation methods thereof. Preparation materials of the aliphatic-polyamide-modified copolyester comprise: terephthalic acid, ethylene glycol with an amount of 105-200mol% of the terephthalic acid, diethylene glycol isophthalate-5-alkali metal sulfonate with an amount of 1-10mol% of the terephthalic acid, and aliphatic polyamide with an amount of 1-40wt% of terephthalic acid. According to the aliphatic-polyamide-modified copolyester, flexible aliphatic polyamide chain segments are introduced into polyester macromolecular chains, such that macromolecular chain regularity is broken, and copolyester crystallinity and glass transition temperature are reduced. Aliphatic-polyamide-modified copolyester fiber prepared by using the aliphatic-polyamide-modified copolyester has soft texture. Also, when sulfonate groups are introduced into polyester macromolecular chains, flexible aliphatic polyamide chain segments are introduced, such that the copolyester fiber can be dyed by using cationic dyes under normal temperature and normal pressure.

The invention discloses a preparation method of a soluble, colorless, transparent and low-thermal-expansion-coefficient polyamide imide film. According to the prepared film, fluorine-containing diamine monomers serve as diamine monomers, trimellitic anhydride acid chloride serves as anhydride monomers, and the polyamide imide film is further prepared through a trimethylchlorosilane activation mechanism under a simple and moderate synthesis condition. The prepared polyamide imide film has high dimensional stability (the CTE is 5-15 ppm/DEG C or so) and good temperature resistance (Tg is 300 DEG C or so), the transmittance of visible light wavebands is 90% or so, the prepared polyamide imide film can be dissolved in an aprotic polar solvent and is convenient to machine and process, and the comprehensive performance of the prepared polyamide imide film meets the material performance requirement of a part of devices in the microelectronics and optoelectronics field.

The invention belongs to the technical field of polyurethane, and particularly relates to a high-weather-resistance ultra-transparent thermoplastic polyurethane elastomer and a preparation method thereof. The thermoplastic polyurethane elastomer comprises the following raw materials: macromolecular diol, diisocyanate micromolecular diol, an antioxidant, a lubricant, a catalyst, an ultraviolet light absorber and a light stabilizer. The preparation method comprises the following steps: mixing the raw materials, pouring the mixture into a co-rotating twin-screw reactive extruder, carrying out polymerization reaction to obtain a high-molecular polymer; and carrying out underwater granulation, dehydration, drying, packaging and curing treatment to obtain the finished product. The thermoplasticpolyurethane elastomer product disclosed by the invention has ultrahigh transparency, excellent weather resistance and high hardness, wherein the transparency of the polyester type thermoplastic polyurethane elastomer can reach that the turbidity of a 4mm test piece is less than or equal to 2.0% and the turbidity of a 6mm test piece is less than or equal to 5.0%; the transparency of the polyethertype thermoplastic polyurethane elastomer can reach that the turbidity of a 6mm test piece is less than or equal to 2.0% and the turbidity of an 8mm test piece is less than or equal to 5.0%.

The invention discloses a polyimide film and a preparation method and applications thereof. The compound forming the polyimide film is the compound of which structural general formula is shown in the formula I. The preparation method of polyimide is as follows: aromatic dianhydride 2,3,3',4'-diphenyl ether tetracarboxylic acid dianhydride (aODPA) and a series of aromatic diamine monomers are used as raw materials to prepare polyimide resin through chemical imidization. The polyimide film prepared by the technology has good optical transparency, low solar absorptivity-emissivity ratio and good thermal stability, and can be used to prepare the thermal protection device of the spacecraft, the solar cell array substrate and the antenna reflector/collector or solar sail and have important application value.

The invention relates to a preparation method of copolyether ester, belonging to the field of thermoplastic block copolyether ester elastomers. The copolyether ester contains a short-chain polyester hard segment and a long-chain polyether ester soft segment, wherein the short-chain polyester hard segment comprises repeating units of a dicarboxylic acid component and a dihydric alcohol component, and the long-chain polyether ester soft segment comprises repeating units of a dicarboxylic acid component and a poly alkylene ether glycol component. The polyester hard segment comprises a polyester segment (A) and a polyester segment (B), wherein the polyester segment (A) comprises repeating units of an aromatic dicarboxylic acid component and a 1,4-butanediol component, and the polyester segment (B) comprises repeating units of an aromatic dicarboxylic acid component and a 1,4-cyclohexanedimethanol component; and the polyether ester soft segment is a polyether ester segment (C) which comprises repeating units of an aromatic dicarboxylic acid component and a poly alkylene ether glycol component. The product has excellent comprehensive performance, the melting point is 160-220 DEG C, the elongation at break is 500-1400%, and the thermal decomposition temperature is 360-450 DEG C.

The invention discloses a preparation method of a high-elongation spandex fiber, and belongs to the technical field of high polymer material preparation. The method is especially suitable for high-speed spinning of the spandex fiber. The method comprises the following steps of (1) taking diisocyanate and oligomer dihydric alcohol as basic raw materials at a prepolymerization reaction stage to obtain an isocyanate group-terminated prepolymer; (2) dissolving the prepolymer obtained in the step (1) by using a non-protonic polar solvent to obtain a prepolymer liquid; (3) adding a mixed amine liquid prepared from a chain extender and a chain terminator to the prepolymer liquid obtained in the step (2) and carrying out prepolymerization reaction to obtain a polyurethaneurea liquid, wherein the chain extender is a mixture of polyether amine and aliphatic diamine; and (4) curing the spandex fiber prepared in the step (3) and then preparing the high-elongation spandex fiber by adopting dry spinning.

The invention belongs to the field of polymer material technology, and discloses a biodegradable polyester and its preparation method. The inventive biodegradable polyester has the following repeated unit structure, wherein n=1-1,000, M=1-1,000, o=0-11, P=2-13, q=0-11, and r=0-10. The prepared product has excellent processing performance and mechanical performance and outstanding biodegradability, and can be used to substitute for the widely used PE plastic film.

The invention discloses a preparation method and application of modified polysiloxane solid polymer electrolyte membrane (SPE). The SPE is prepared from poly(methylhydrosiloxane) (PMHS), nitrile imidazole ionic liquid (IL-CN), allyl terminated polyether (PEO), lithium salt and a cross-linking agent. The preparation method comprises the following steps: 1, sufficiently mixing the PMHS, PEO and IL-CN in anhydrous toluene, adding a chloroplatinic acid catalyst, and performing reaction for a certain period of time at certain temperature; 2, mixing an appropriate amount of the lithium salt, the cross-linking agent and a catalyst into a product in the step 1 in anhydrous acetonitrile, sufficiently stirring, pouring a solution into a polytetrafluoroethylene die, and performing heating, cross-linking and solidifying in a vacuum drying oven, so as to obtain the all-solid-state polymer polymer electrolyte membrane. An obtained electrolyte has high conductivity, wide electrochemical stability window and high stability, and can be applied to lithium secondary batteries.

The invention discloses a high-molecular-weight polyester plastic based on 2,3-butanediol. The polyester plastic has a repetition structure unit shown in the formula, wherein R1 is defined in the specification, p is 0-11, R2 is defined in the specification, R3 is defined in the specification, n is 1-1000, and m is 1-1000. The invention further discloses a preparation method for the high-molecular-weight polyester plastic based on 2,3-butanediol. The polyester plastic is a transparent polyester plastic due to the existence of the side-chain methyl of 2,3-butanediol, as well as is high in molecular weight, excellent in mechanical property, and wide in application prospect in the aspects of injection-moulded parts, optical devices, thin films, laminated materials and the like.

The present invention relates to the field of nylon materials, and discloses a melting direct-spinning method of copolymerized modified low-melting-point nylon fibers. The method comprises the steps of 1) material preparation, wherein caprolactam, a copolymerized modified component, an end-capping agent, water and a catalyst are heated and mixed; 2) ring opening, wherein a mixture is heated for ring opening; 3) pre-polycondensation, wherein a pre-polymerization reaction and devolatilization are performed; 4) final polycondensation, wherein a final polycondensation reaction and devolatilizationare performed; 5) devolatilization before spinning; and 6) spinning, wherein a product is directly conveyed to spinning threads for spinning to obtain the copolymerized modified low-melting-point nylon fibers. According to the method, the copolymerized modified component is added for destroying the regularity of nylon molecular chains and reducing the hydrogen bond density and crystallinity of the nylon molecular chains, thereby achieving the purpose of lowering the melting point of nylon; and according to different varieties and content of added copolymerized components, the melting point ofthe nylon can be controlled to be 90-200 DEG C, so that the application range of the low-melting-point nylon is greatly expanded.

The invention provides a preparation method of a high-molecular-weight polyethylene microporous membrane. Polyethylene is an ultrahigh-molecular-weight copolymer of ethylene and alpha-olefin. The preparation method comprises the following steps: carrying out melt mixing, filming through extruding or mould pressing, solvent extraction, drying setting and two-way stretching on an ultrahigh-molecular-weight polyethylene copolymer to obtain the microporous membrane. The polyethylene microporous membrane, provided by the invention, is uniform in pore size distribution and high in porosity, and has better longitudinal and horizontal mechanical property. The microporous membrane can be used in fields such as water treatment, separation and purification.

This invention cuts and mixes in different proportion TPA - isophthalic acid 5-sodium sulfonate glycol ester for different triod anode ion. dyes or TPA - isophthalic acid glycol ester for disperse dyes to design modified silk spray plates to spin modified hollow closed cross-section fibers and optimize the alkali process conditions to get high water reserved rate free dyed multifunction copolyester fibers.

The invention discloses a low-temperature resistant high-resilience rubber windshield material, a preparation method thereof and a windshield. The windshield material is prepared from the following components in parts by weight: 40-75 parts of ethylene propylene diene monomer rubber, 25-60 parts of ethylene butene diene monomer rubber, 8-12 parts of liquid ethylene propylene rubber and 5-8 parts of maleic anhydride modified polybutadiene, wherein the total weight parts of the ethylene propylene diene monomer rubber and the ethylene butene diene monomer rubber are 100 parts. The invention aimsto improve low-temperature performance and flex resistance performance of ethylene propylene diene monomer (EPDM), particularly resilience and flex crack growth resistance at low temperature. The windshield material has excellent comprehensive performance in the aspects of physical mechanical performance, low-temperature performance, flex resistance, flame retardant performance, environmental protection performance and the like, and can meet technical requirements of windshield products.

The invention provides a light-masking hydrophilic fiber and a preparation method thereof. The preparation method comprises the following steps: A1, dividing inorganic light-masking powder into a first part and a second part, blending the first part of powder, aromatic dibasic acid and aliphatic diol into mixed slurry, and performing esterification reaction on the mixed slurry, so as to form a pre-reaction melt; A2, adding aliphatic polyamide into the pre-reaction melt, performing polycondensation reaction, and cooling, so as to form a modified polyester material; A3, coating the surface of the second part of powder with a resin coating, so as to form composite master batch; A4, blending and melting the modified polyester material and the composite master batch, so as to obtain a hydrophilic group modified polyester melt containing the inorganic light-masking powder; A5, spinning and drafting the hydrophilic group modified polyester melt containing the inorganic light-masking powder, so as to obtain the light-masking hydrophilic fiber. The fiber prepared by the preparation method has good internal reflection light absorption effect, and high refractive index and hydrophilicity, and the prepared textiles have good visual masking effect and good skin adaptability.

The invention relates to a preparation method of PEGMA/PEGDA hydrogel fibers having an ultrafast-anisotropically water-absorption performance. The preparation method comprises following steps: 1) preparing PEGMA through a polymerization reaction at room temperature; 2) preparing a polymer water solution from the PEGMA and the PEGDA, adding a photo-initiator, performing ultrasound dispersion, stirring the mixture until the photo-initiator is dissolved completely to obtain a PEDMA/PEGDA spinning solution; 3) at room temperature, feeding the spinning solution into a water bath through a spinning spray head by a metering pump, setting an ultraviolet point light source to enable a free radical polymerization reaction of the PEDGA in the spinning solution for preparing primary PEGMA/PEGDA hydrogel fibers; and 4) drafting the primary PEGMA/PEGDA hydrogel fibers to obtain the PEGMA/PEGDA hydrogel fibers. The PEGMA/PEGDA hydrogel fibers are stable in structure and good in water absorption performance. The preparation method has very important significance on development, application and post-processing of hydrogel materials.

The invention discloses a preparation method of polyurethane modified aramid fiber pulp. A polyurethane spinning solution is added to an aramid fiber spinning solution, and the obtained mixed spinning solution is spun. Polyurethane has a high elasticity and a high strength, so the modified aramid fiber pulp has enough strength and toughness; and spinning fibers are treated with an aqueous LiCl solution, and the treated spinning fibers are complexed with carbonyl groups in the molecular chain of aramid fibers in order to destroy the regularity of the molecular chain of the aramid fibers and etch the surface of the aramid fibers, so the surface roughness of the aramid fibers is increased, the specific surface area of the modified aramid fiber pulp obtained after beating treatment is increased, and the adsorption capability to resin and rubber materials is improved.

The invention relates to a preparation method of high barrier light-proof, preservative and environment-friendly polyester material. The method comprises the following technical processes: 1) performing preliminary modification of montmorillonite to obtain organized montmorillonite loaded with main titanic type catalyst; 2) selecting proper branching agent; 3) performing esterification; 4) performing polycondensation, wherein firstly the expanded montmorillonite loaded with titanium and stable other metal composite catalyst and branching agent are separately dissolved in ethanediol to obtain additives, the additives are injected through an additive nozzle, polyphosphoric acid is injected through another nozzle, the dosage is subject to the content in polyester, a gear pump is used to inject the esterified oligopolymer along with the above additives in the pipeline in a prepolymerizer; the prepolymerizer is an upflow bubble tower; and when reaching the top of the prepolymerizer, the material flows to a final polycondensation autoclave, and the product is filtered by a melt filter and then pulled to a pelleter to prepare polyester slices; and 5) tackifying solid phase. The method of the invention can provide the high barrier light-proof, preservative and environment-friendly polyester material.

The invention provides a solidified and modified epoxy resin composition containing a side carboxyl hyperbranched polyarylether copolymer. The epoxy resin composition mainly comprises the side carboxyl hyperbranched polyarylether copolymer, epoxy resin, a curing agent and a curing accelerator. The invention also provides a preparation method and the application of the epoxy resin composition. Thepreparation method comprises the following steps: mixing the side carboxyl hyperbranched polyarylether copolymer, epoxy resin, a curing agent and a curing accelerator, adding the mixture into an organic solvent, stirring and heating, carrying out procedural warming, mixing the obtained epoxy resin composition with the inorganic matter, and carrying out solidification and mould pressing to preparethe epoxy resin matrix composite material. The tenacity of the epoxy resin composition prepared by using the method is obviously improved, the modulus, heat resistance and insulativity are obviously improved, and the epoxy resin composition has broad applications in the fields of aerospace special type electronic insulation materials, high temperature resistant coatings, laminated boards and advanced composite materials.