778 results about "Comonomer" patented technology

The invention discloses supercritical fluid foaming polyimide wave-absorbing foam and a preparation method thereof.The thermoplastic polyimide is prepared by the steps that aromatic dianhydride, aromatic diamine and aliphatic diamine serve as comonomers, polyimide acid is generated through solution polymerization, and then high-temperature cyclization is conducted; wherein the mole number of the aliphatic diamine accounts for 10-50% of the total mole number of the diamine, and the free volume and glass transition temperature of a molecular chain are effectively regulated and controlled by introduction of the aliphatic diamine; the wave-absorbing foam is prepared by taking polyimide as a matrix, doping 1-20wt% of wave-absorbing filler, and foaming for 1-3 hours in a supercritical carbon dioxide or nitrogen environment at the temperature of 180-220 DEG C and the pressure of 9-25MPa, through molecular structure design, the adsorption capacity and impact resistance of polyimide to carbon dioxide are remarkably improved, and the prepared foam has the advantages of light weight, high porosity, uniform foam structure and excellent heat resistance, can realize effective electromagnetic wave absorption in an X wave band, and is suitable for the fields of aerospace stealth and electromagnetic compatibility protection.

The application discloses a cross-linked ETFE composite film with gradient ultraviolet shielding function and a preparation method and application thereof, and belongs to the technical field of ETFE film preparation. The cross-linked ETFE composite film is composed of three layers of a surface layer, a middle layer and a bottom layer. The surface layer material comprises ETFE resin and fluorinated carbon quantum dots; the middle layer material comprises ETFE resin, allyl-containing comonomer A and phenyl-containing comonomer B; and the bottom layer material comprises ETFE resin and CeO2 nanowires. The fluorinated carbon quantum dots have a particle size of 3-5 nm and contain a -C4F9 structure. The comonomer A is an allyl-containing fluorine olefin monomer, and the comonomer B is a phenyl-containing organic fluorinated compound. Through the synergistic effect of the surface layer self-migration fluorinated carbon quantum dots, the middle layer copolymerization modification and the bottom layer CeO2 nanowires, high light transmittance, full-waveband ultraviolet shielding and long-term weather resistance are achieved.

The invention relates to the technical field of high polymer materials, and discloses a high-durability pressure-sensitive adhesive with low VOCs release and a preparation method thereof.The high-durability pressure-sensitive adhesive is prepared from, by weight, 50-80 parts of acrylate copolymer, 0.5-5 parts of cross-linking agent, 10-30 parts of tackifying resin, 1-10 parts of inorganic filler, 0.1-2 parts of antioxidant and 20-50 parts of solvent. Wherein the tackifying resin is at least one of hydrogenated petroleum resin and glycerol ester of rosin, and the inorganic filler is one of nanoscale silicon dioxide and calcium carbonate. Butyl acrylate is used as a main monomer, 2-ethylhexyl acrylate is used as a comonomer, acrylic acid is used as a functional monomer, benzoyl peroxide is used as an initiator, free radical polymerization is carried out at the temperature of 60-85 DEG C under the protection of nitrogen for 4-8 hours, and a copolymer chain with the molecular weight distribution index (PDI) smaller than or equal to 2.5 is formed, so that the viscosity and elasticity of colloid can be balanced; the peeling strength and the weather resistance are improved, and the colloid is prevented from being too soft or embrittled.

The invention discloses a method for producing multimodal polyethylene through series connection of multiple reactors, and belongs to the field of olefin polymerization. The low-molecular-weight or medium-molecular-weight ethylene polymer is produced through polymerization in the first reactor, the obtained product enters the intermediate treatment unit to remove hydrogen, and then part of the product is shunted to enter the second reactor to be mixed with the ultra-high-molecular-weight ethylene polymer produced through ethylene polymerization in the second reactor; all polymers of the second reactor are returned to the intermediate treatment unit, and the rest products after hydrogen removal enter a third reactor and are mixed with high-molecular-weight ethylene polymers generated by copolymerization of ethylene and comonomers in the third reactor to generate multimodal polyethylene. The multimodal polyethylene produced by the method is wide in molecular weight distribution, and the molecular weight of ultra-high molecular weight polyethylene is flexible to regulate and control. According to the invention, material circulation between the third reactor and the second reactor is adopted, molecular chain-level mixing among the components is achieved, the compatibility is good, and the mechanical property is more excellent.

The invention relates to a dry-jet wet-spinning ultra-high-performance polyacrylonitrile-based carbon fiber and a preparation method thereof, and belongs to the technical field of carbon fibers. A preparation method of dry-jet wet-spinning ultra-high-performance polyacrylonitrile-based carbon fiber comprises the following steps: S1, mixing acrylonitrile, a comonomer, a chain transfer agent, an initiator and a solvent, carrying out polymerization reaction through a solvent dropwise addition method, and preparing a spinning solution; wherein the comonomers comprise a first comonomer, a second comonomer and a third comonomer; s2, the spinning solution is subjected to solidification, water washing, water drawing, oiling, drying and steam drawing, and precursor fibers are obtained; s3, the precursor fiber is sequentially subjected to pre-oxidation, low-temperature carbonization, high-temperature carbonization, graphitization, surface treatment, sizing and drying, and the ultra-high-performance polyacrylonitrile-based carbon fiber is prepared. Wherein the pre-oxidation adopts four-stage pre-oxidation treatment. The strength and modulus of the carbon fiber can be effectively and synergistically optimized, and the carbon fiber with high strength and high modulus is prepared.

The invention relates to a thermoplastic molding composition (P) comprising: (A) thermoplastic polymer composition (A) comprising: (A-1) 10 to 50 wt.-% of graft copolymer (A-1), (A-2) 1 to 50 wt.-%, of thermoplastic polymer matrix (A-2) based on one or more vinylaromatic copolymers, (A-3) 20 to 50 wt.-%, of polymerized alkyl methacrylate component (A-3), and (A-4) 0 to 45 wt.-% of comonomer which is copolymerized with the at least one polymerized alkyl methacrylate component (A-3), where the sum of (A-1), (A-2), (A-3) and optional comonomers (A-4) is 83.2 to 99.8 wt.-%; (B) a hindered amine light stabilizer composition (B), comprising at least two of substances (B-1) to (B-3): (B-1) 0 to 0.9 wt.-%, of at least one hindered amine light stabilizer having a dipiperidine structure with at least one alkyl group at each of the 2 and 6 positions of the dipiperidine structure (B-2) 0 to 0.9 wt.-%, of a hindered amine light stabilizer mixture having a monopiperidine structure with at least one alkyl group at each of the 2 and 6 positions of the monopiperidine structure, and (B-3) 0 to 2 wt.-%, of at least one hindered amine light stabilizer having a polymeric structure comprising piperidine groups with at least one alkyl group at each of the 2 and 6 positions of the piperidine groups (C) 0 to 5 wt.-%, of one or more further additives (C), different from (B); and (D) 0 to 10 wt.-%, of colorants, dyes and / or pigments (D), different from (C); wherein the constituents (A) to (D) sum up to 100 wt.-% of the molding composition (P).

The invention discloses a plant-based deodorant and a preparation method thereof, and relates to the technical field of high polymer materials. When the plant-based deodorant is prepared, beta-cyclodextrin reacts with paratoluensulfonyl chloride and then reacts with ethylenediamine, and amino modified cyclodextrin is prepared; the plant-based extract is subjected to inclusion with amino modified cyclodextrin, and a cyclodextrin inclusion compound is prepared; the preparation method comprises the following steps: reacting hydroxyethyl cellulose with methacrylic anhydride to prepare double-bond modified cellulose; carrying out hydrothermal reaction on titanium sulfate, the carboxylated multi-walled carbon nanotube, ammonium fluoride and cerous nitrate to prepare a co-doped titanium dioxide / carbon nanotube; coating the co-doped titanium dioxide / carbon nano-tubes with oleic acid to prepare modified nano-particles; and reacting the double-bond modified cellulose with the cyclodextrin inclusion compound, and then copolymerizing with the modified nanoparticles and the comonomer to obtain the plant-based deodorant. The prepared plant-based deodorant has the advantages of good deodorization effect, slow release and photocatalytic degradation.

The present invention relates to a vinyl pyrrolidone copolymer of N-vinyl pyrrolidone and a maleic acid comonomer wherein the vinyl pyrrolidone copolymer is functionalized with a benzophenone substituent (BP) wherein the amount of maleic acid in the vinyl pyrrolidone copolymer is less than 1 mol%, preferably from 0.1 to 0.95 mol%, further preferably from 0.1 to 0.90 mol%, more preferably from 0.1 to 0.85 mol%, more preferably from 0.2 to 0.88 mol%, and the amount of N-vinyl pyrrolidone is less than 1 mol%, preferably from 0.1 to 0.95 mol%, further preferably from 0.1 to 0.90 mol%, more preferably from 0.1 to 0.85 mol%, more preferably from 0.2 to 0.88 mol%. The invention relates to the technical field of organic solvents, in particular to a method for preparing the organic solvents, which comprises the following steps of: preferably, 1-3mol%, more preferably, 0.3-0.88 mol%, more preferably, 0.4-0.88 mol%, even more preferably, 0.5-0.85 The vinyl pyrrolidone copolymer of the present invention is particularly suitable for use in coatings of medical devices and / or medical aids. Thus, the invention also relates to a composition comprising a vinyl pyrrolidone copolymer and optionally a cross-linking agent, and a medical device having a coating comprising a cross-linked vinyl pyrrolidone copolymer and optionally a cross-linking agent.

The invention discloses vinyl fluorine-containing polysiloxane and a preparation method thereof, and relates to the technical field of organic silicon materials. According to the invention, high-activity fluorine-containing potassium hydroxide silanolate is used as a catalyst to realize high-efficiency catalysis; d3F serves as a main monomer, D3Vi serves as a comonomer, deionized water is introduced for the first time to serve as a retarder, and implosion is effectively inhibited; vinyl dimethyl ethyoxyl silane is used as an end-capping reagent for the first time, end group vinylation is synchronously realized, and end group and side chain divinyl polysiloxane is prepared; through cooperation of ring-opening polymerization and condensation polymerization, the reaction process is mild and controllable, the product viscosity is controllable, the crosslinking activity is high, and the application range is remarkably widened.

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 relates to the technical field of garment materials, and discloses a high-moisture-absorption breathable polyester fabric and a preparation method thereof. The preparation method of the high-moisture-absorption breathable polyester fabric comprises the following steps: mixing terephthalic acid, ethylene glycol, a modified flame-retardant comonomer and tetrabutyl titanate, and carrying out esterification and melt polycondensation to obtain modified polyester; mixing the modified polyester and the polyester master batch, and spinning to obtain the high-performance hollow polyester fiber. Blending and knitting high-performance hollow polyester fibers and cotton fibers to obtain polyester fabric; the preparation method comprises the following steps: modifying palygorskite with a silane coupling agent KH-550, and then loading phosphorus-doped carbon dots to obtain loaded modified palygorskite; the polyester fabric is soaked in the polydopamine finishing liquid and the loaded modified palygorskite aqueous dispersion liquid, and the high-moisture-absorption breathable polyester fabric is obtained. The high-moisture-absorption breathable polyester fabric not only has good moisture absorption and breathability, but also has excellent flame retardance.

The present disclosure relates to a process for polymerising olefins in multistage polymerisation process configuration. The process comprises polymerising, in a reactor, first olefin monomer, optionally in the presence of at least one alpha olefin comonomer, in the presence of a polymerisation catalyst to produce a first polymer component (A); polymerising, in a downstream gas phase reactor, second olefin monomer at a first operating pressure in the presence of the first polymer component (A) and optionally in the presence of at least one alpha olefin comonomer to produce a second polymer component (B) at a production rate that provides a weight ratio of first polymer component (A) to second polymer component (B) that is below a target threshold value; and increasing the first operating pressure to a second operating pressure in the downstream gas phase reactor when the weight ratio of first polymer component (A) to second polymer component (B) increases above the target threshold value.

The invention discloses a protective base film for a polaroid and a preparation method of the protective base film, and belongs to the technical field of optical display equipment protective films. The protective base film comprises an antistatic PET base material layer and a self-adhesive layer, the antistatic PET base material layer is prepared by blending optical-grade PET slices and antistatic master batches, the master batches are prepared by taking ionic liquid dihydric alcohol as a comonomer, and the base film is endowed with lasting and stable intrinsic antistatic performance; the self-adhesive layer is formed by melting and blending a polyurethane acrylate prepolymer, a modified montmorillonite filler, other matrix materials and auxiliaries according to a specific ratio and carrying out an online UV curing process. Through innovative material design and an integrated forming process, the prepared protective base film has excellent optical transparency, lasting antistatic property, appropriate bonding strength, clean stripping property and outstanding damp-heat aging resistance, the comprehensive performance is remarkably superior to that of a traditional gluing protective film, and the production process is more environment-friendly and efficient.

The invention relates to the technical field of concrete admixtures, in particular to a viscosity reduction type polycarboxylate superplasticizer and a preparation method thereof. The viscosity reduction type polycarboxylate superplasticizer is formed by polymerizing a comonomer under the action of an oxidizing agent, a reducing agent and a chain transfer agent, the comonomer comprises methoxyallyl polyoxyethylene ether, an air-entraining functional monomer, a viscosity-reducing functional monomer, a silicon-containing functional monomer, unsaturated acid and ferrous sulfate. The polycarboxylate superplasticizer provided by the invention can effectively reduce the viscosity of concrete, so that a concrete mixture has good flowability, workability and wrapping property, meanwhile, the strength of the concrete is not influenced as far as possible, the strength of the concrete is kept at a good level, and the concrete keeps good constructability. Moreover, when the viscosity-reducing polycarboxylate superplasticizer is prepared, the reaction can be completed at the normal pressure of 20-25 DEG C, the preparation steps are simple, the reaction condition is mild, no toxic gas is released, energy can be effectively saved, and the viscosity-reducing polycarboxylate superplasticizer meets the green building material standard.

The invention discloses an optical adhesive with high light transmittance and high peel strength and a preparation method thereof. According to the method adopted by the invention, an alicyclic structure is introduced into a prepolymer (polyurethane acrylate high polymer), so that the viscosity of the optical adhesive is reduced, the movement of free radicals of a photoinitiator is facilitated, and the curing rate of the optical adhesive is improved. According to the method adopted by the invention, the molecular weight and distribution of the prepolymer are controlled through RAFT polymerization, and block copolymerization of urethane acrylate and monomers containing benzene rings and allyl ester is formed, so that soft and hard segments in the prepolymer (urethane acrylate high polymer) are reasonably distributed, and the mechanical property of the optical adhesive is improved; and the block copolymerization degree of the prepolymer (polyurethane acrylate high polymer) is improved.

1. A method for transitioning two different catalysts during the production of a polypropylene homopolymer or copolymer in a sequential multi-stage polymerization reaction, said method comprising: a) polymerizing propylene and optionally a comonomer in the presence of a first catalyst in a multi-stage polymerization reactor system comprising a prepolymerization reactor followed by a slurry reactor and then a gas phase reactor; b) discontinuing the supply of the first catalyst to the prepolymerization reactor; c) subsequently introducing propylene, optionally a comonomer, and a second catalyst into said prepolymerization reactor, and further introducing an aluminum alkyl into said polymerization reactor simultaneously with said introduction of said second catalyst; d) polymerizing propylene and optionally a comonomer in the presence of a second catalyst in said multi-stage polymerization reactor system. The process includes the steps of: wherein the first catalyst is a Ziegler-Natta catalyst and the second catalyst is a single-site catalyst; and wherein the amount of aluminum alkyl supplied in step c) is 0.5 to 10.0 g per ton of total propylene supplied into the prepolymerization reactor and the slurry reactor in steps c) and d). The method.

The invention discloses a composite membrane with adsorption separation and catalytic degradation functions as well as a preparation method and application of the composite membrane. The composite membrane is supported by a porous base membrane, a polyamide separation layer formed by reaction of a 3, 4-dihydroxyphenylethylamine and 2, 3-diaminophenol comonomer and acyl chloride is constructed on the surface of the porous base membrane through interfacial polymerization, and FeCo-g-C3N4 nanosheets are anchored in situ; the membrane can efficiently activate peroxymonosulfate (PMS) to generate free radicals under the nearly neutral condition, efficient interception and catalytic degradation of organic pollutants (such as antibiotics) are synchronously achieved, and heavy metal ions (such as Pb < 2 + > and Cd < 2 + >) are adsorbed through a functional monomer structure; the invention provides an interfacial polymerization preparation method of the membrane. The composite membrane breaks through the limitation of'only interception but not degradation 'of a traditional membrane, realizes integration of'separation-adsorption-degradation', can remarkably reduce the volume of concentrated water and reduce the toxicity of the concentrated water, and is suitable for advanced treatment of wastewater containing composite pollutants in the industries of pharmacy, printing and dyeing and the like.

The invention provides a high-safety flexible pole piece, a preparation method and a flexible lithium ion battery, the pole piece comprises a current collector and a coating arranged on the surface of the current collector, the coating comprises a flexible isolation structure and a plurality of electrode units, the flexible isolation structure constructs a plurality of accommodating areas isolated from each other on the surface of the current collector, the number of the electrode units is multiple, and the flexible isolation structure is arranged in the accommodating areas. The plurality of electrode units are respectively and independently arranged in different accommodating areas. According to the invention, accurate prevention and control of thermal runaway are realized through the electrode structure design of partition isolation and a material system with multiple hydrogen bonds synergistic effect. The electrode is divided into independent units by the flexible isolation structure, so that heat spreading is effectively blocked; and a hydrogen bond network formed by the hydroxyl-containing comonomer I, PI, PET and hexaphenoxy cyclotriphosphazene significantly enhances the interface stability and flame retardant efficiency of the electrode and the isolation structure, and improves the intrinsic safety of the battery while ensuring the flexibility of the battery.

The invention relates to the field of polymer composite materials, and discloses a bionic polymeric gel and a preparation method and application thereof, the gel comprises a hydrophobic continuous phase skeleton composed of siloxane, a styrene block copolymer and the like, and a hydrophilic network formed by in-situ polymerization of hydrophilic precursors such as super absorbent resin and the like and interpenetrating with the hydrophobic continuous phase skeleton. The preparation method adopts a continuous reaction extrusion process and comprises the following steps: firstly, melting and blending the main components, and then sequentially injecting the bifunctional interface anchoring agent, the skeleton protection type comonomer and the thermal initiator through a lateral charging port. According to the method, a chemical bond is constructed on a two-phase interface through an interface anchoring agent, and degradation of a hydrophobic skeleton is inhibited by using a skeleton protection type comonomer. The prepared gel is stable in structure, has excellent adhesion and high hygroscopicity, and can be used for preparing medical application, pressure-sensitive adhesive or transdermal absorption preparations.

The present invention relates to a cable comprising a polypropylene composition comprising (A) from 80.0 to 99.0 wt.-%, preferably from 82.5 to 97.2 wt. %, most preferably from 85.0 to 95.0 wt.-% of a copolymer of propylene and comonomer units selected from ethylene and alpha-olefins having from 4 to 12 carbon atoms having a total amount of comonomer units of from 10.0 to 16.0 wt %, preferably from 11.0 to 15.0 wt %, most preferably from 12.0 to 14.0 wt %, based on the total amount of monomer units of the copolymer of propylene (A); a melt flow rate MFR2 of from 0.5 to 2.5 g / 10 min, preferably from 0.8 to 2.3 g / 10 min, still more preferably from 1.0 to 2.0 g / 10 min and most preferably from 1.2 to 1.7 g / 10 min; a xylene cold soluble (XCS) fraction in a total amount of from 25.0 to 50.0 wt %, preferably from 27.5 to 45.0 wt %, more preferably from 30.0 to 42.5 wt % and most preferably from 32.5 to 40.0 wt %, based on the total weight amount of the copolymer of propylene (A); and (B) from 1.0 to 20.0 wt.-%, preferably from 2.5 to 17.5 wt %, most preferably from 5.0 to 15.0 wt.-% of a copolymer of ethylene and comonomer units selected from alpha-olefins having from 4 to 12 carbon atoms obtainable in the presence of a single site catalyst and having a density of from 860 to 930 kg / m3, preferably from 865 to 925 kg / m3, most preferably from 870 to 920 kg / m3, determined according to ISO 1183.

The present invention belongs to the technical field of coatings, and in particular discloses a vinyl epoxy siloxane modified acrylic resin and a preparation method therefor. The vinyl epoxy siloxane modified acrylic resin is a vinyl epoxy polysiloxane graft-modified acrylic resin synthesized by using styrene, an acrylate monomer with a specific composition, vinyltriisopropoxysilane, etc., as comonomers, producing a copolymer therefrom under the action of an initiator, and then grafting epoxy siloxane thereto by means of a chemical synthesis modification method. By means of a copolymerization reaction and grafting modification, the molecular chains of the resin are endowed with a relatively large number of silane branches and an appropriate amount of epoxy groups and silane groups, which are uniformly distributed, thereby increasing the glass transition temperature of the resin. Also disclosed in the present invention are a weather-resistant topcoat based on the vinyl epoxy siloxane modified acrylic resin, and a preparation method therefor. The relatively high glass transition temperature of the vinyl epoxy siloxane modified acrylic resin ensures that the weather-resistant topcoat has good self-drying performance and medium resistance.

The present invention relates to a polypropylene composition comprising (A) from 80.0 to 99.0 wt.-% of a copolymer of propylene and comonomer units selected from ethylene and alpha-olefins having from 4 to 12 carbon atoms having a total amount of comonomer units of from 10.0 to 16.0 wt %, based on the total amount of monomer units of the copolymer of propylene (A); a melt flow rate MFR2 of from 0.5 to 2.5 g / 10 min; a xylene cold soluble (XCS) fraction in a total amount of from 25.0 to 50.0 wt %, based on the total weight amount of the copolymer of propylene (A); and (B) from 1.0 to 20.0 wt.-% of an ethylene polymer having a density of from 915 to 960 kg / m3; and a melt flow rate MFR5 (190° C., 5 kg) of from 0.05 to 5.0 g / 10 min, an article comprising said polypropylene composition, preferably a cable comprising an insulation layer comprising said polypropylene composition, and the use of said polypropylene composition as cable insulation for medium and high voltage cables.

The invention belongs to an allyl alcohol copolymer, and particularly relates to a method for preparing an allyl alcohol copolymer based on an intermediate conversion method, the allyl alcohol copolymer and application of the allyl alcohol copolymer. The method comprises the following steps: reacting allyl alcohol with a hydroxyl conversion reagent to convert hydroxyl into other groups so as to obtain a new allyl monomer; carrying out copolymerization on the monomer and other comonomers under the action of an initiator to obtain a copolymer; the hydroxyl is recovered by removing a conversion group, so that efficient and green preparation of the allyl alcohol copolymer is realized. The hydroxyl is converted into other groups, so that the reactivity rate of copolymerized monomers is closer during copolymerization, and the regulation and control of molecular weight and molecular composition are easy to realize; the high-temperature and high-pressure reaction conditions are avoided, and the safety risk caused by the fact that the highly toxic allyl alcohol raw material is greatly excessive is avoided; the polymerization reaction can be performed under normal pressure, the reaction condition is mild, and the equipment investment and maintenance cost are reduced; and the amount of residual allyl alcohol in the product is greatly reduced.

Articles may be formed from a thermoformable composition, the thermoformable composition including: a) about 35 wt % to about 95 wt % of an acrylic pre-polymerized syrup; b) about 0 wt % to about 10 wt % of a comonomer; and c) about 5 wt % to about 65 wt % of a filler having an average particle size (d50) in a range of about 0.1 μm to about 50 μm; wherein the article has a surface having a gloss measurement at a 60° measurement angle within a range of about 0 Gloss Units to about 20 Gloss Units, and a roughness Ra within a range of about 1 microinch to about 100 microinches. Methods may include producing a thermoformed article by the steps of: i) preparing a thermoformable composition; ii) casting the thermoformable composition into a sheet; and iii) thermoforming the cast sheet against a mold to produce a thermoformed article.

The invention discloses a 27.5 KV positive feeder insulation coating material and a preparation method thereof, and relates to the field of coatings. The 27.5 KV positive feeder insulation coating material prepared by the invention is prepared by the following steps: reacting furan with 6-bromo-1-hexene to obtain a comonomer, and reacting the comonomer, polytetrafluoroethylene and ethylene to obtain a copolymer; the preparation method comprises the following steps: protecting maleic anhydride by furan, reacting with 3-aminopropyl methyl dimethoxy silane, performing deprotection to obtain modified silane, and reacting the modified silane with octamethylcyclotetrasiloxane to obtain polysiloxane; the copolymer, the modified polysiloxane, the antioxidant 1010 and methylbenzene react to prepare a base material, and then the base material, the coupling agent and the wear-resistant agent are evenly mixed and discharged to prepare the wear-resistant coating. The 27.5 KV positive feeder insulation coating material prepared by the invention has good tensile strength and self-repairing performance, can realize self-repairing under a heating condition, and prolongs the service cycle of the material.

The invention relates to the technical field of films, in particular to a preparation method and application of a waterproof and oil-proof ventilation valve for food packaging. The preparation method comprises the following steps: carrying out plasma activation treatment on the porous polytetrafluoroethylene-based membrane; preparing fluoroalkyl silane modified silicon dioxide nano particles; preparing fluorine-containing organic silicon-silicon dioxide sol containing vinyl; a cross-linking layer is constructed through vacuum impregnation; preparing a hydrophilic / hydrophobic comonomer solution; copolymerized chain grafting is initiated by ultraviolet light; and water-based fluorocarbon emulsion is sprayed on the surface for curing. The obtained breather valve has super-hydrophobic and oleophobic characteristics, keeps high air permeability and high water vapor permeability at the same time, has the air permeability retention rate exceeding 95% after 10 times of moist heat sterilization, and is suitable for balancing internal and external pressure and blocking water and oil phase liquid permeation in the high-temperature and high-pressure sterilization process of a food packaging container.

The invention relates to a low-alignment-angle high-heat-resistance release film base film for a polaroid and a preparation method thereof, and the release film base film is prepared by taking an optical-grade PET slice as a main body material, adding modified PET and modified SiO2 filler with a specific structure, and carrying out co-extrusion casting and a unique three-section stretching process. According to the modified PET, a 2-(pyridine-3-yl) terephthalic acid comonomer and ionic liquid intercalated montmorillonite are introduced, so that the rigidity and heat resistance of a molecular chain are improved, and a heterogeneous nucleation point is provided; the surface of the modified SiO2 filler is grafted with a terpolymer, so that good compatibility with a matrix and internal lubrication are realized; according to the preparation method, a transverse-longitudinal-transverse three-section stretching sequence and step-by-step increasing temperature control are adopted to cooperatively regulate and control orientation and crystallization of molecular chains; and finally, the optical-grade polyester film with low alignment angle, low transverse thermal shrinkage rate and high surface adhesion is prepared, and is particularly suitable for being used as a release film of a high-end polaroid.

The invention relates to a porous organic polymer supported metallocene catalyst as well as preparation and application thereof, and the catalyst is synthesized by the following steps: S1, copolymerizing a functional monomer containing a phenolic hydroxyl group and a comonomer containing an aromatic ring through Friedel-Crafts alkylation reaction to prepare a porous organic polymer carrier; s2, putting the porous organic polymer carrier into a sealed container, adding an organic medium, stirring and adding an organic aluminum compound in an inert atmosphere, reacting, and carrying out solid-liquid separation, washing and drying on an obtained reaction product to obtain an active organic polymer carrier; and S3, dissolving a metallocene compound in an organic medium, dropwise adding the metallocene compound into the active organic polymer carrier under the protection of an inert atmosphere, carrying out a stirring reaction, and carrying out solid-liquid separation, washing and drying on the obtained reaction product to obtain the supported metallocene catalyst. Compared with the prior art, the carrier is simple in preparation method, wide in monomer source and adjustable in specific surface area and pore volume, and the loaded metallocene catalyst is high in catalytic activity and low in ash content.

The invention discloses a high-refractive-index-difference bottle brush block polymer and a synthetic method of a degradable structural color material, and belongs to the technical field of organic polymers. The end group of the high-refractive-index degradable macromonomer is a cycloolefin derivative capable of performing sequential ring-opening metathesis polymerization reaction (ROMP), and the main chain is a degradable polymer prepared by performing ring-opening copolymerization reaction on styrene oxide (SO) and a comonomer. A series of novel degradable cycloolefin macromonomers are designed and synthesized to replace polystyrene and other non-degradable high-refractive-index polymers commonly used in the field, and the macromonomers and a block copolymer brush are synthesized through ring-opening polymerization and ring-opening metathesis polymerization. And an environment-friendly structural color material capable of covering a full visible light wave band is further prepared by utilizing a phase separation mechanism.

Vessel closure (1, 21, 41, 61) with a sealing element (3, 23, 43, 63), wherein the sealing element (3, 23, 43, 63) comprises a polymer composition; the polymer composition comprising ... (a) between 5 wt.% and 50 wt.% of a first polymer, wherein the first polymer is a random copolymer having a Shore D hardness, measured according to DIN ISO 7619-1 at 23 °C, of ​​at least 35, and wherein 1-butene is a comonomer of the first polymer; (b) between 50 wt.% and 95 wt.% of a second polymer, wherein the second polymer is a polyolefin having a Shore A hardness, measured according to DIN ISO 7619-1 at 23 °C, of ​​not more than 90, in particular not more than 85, and wherein 1-butene is a comonomer of the second polymer; and (c) wherein the first polymer and the second polymer are different polymers.