37 results about "Poly methyl pentene" patented technology

The application discloses a preparation method of a hollow fiber exchange membrane and the hollow fiber exchange membrane, and the preparation method comprises the following steps: stirring and melting poly(4-methyl-1-pentene), a diluent, an antioxidant and an anti-volatilization agent at 220 DEG C to 280 DEG C to obtain a casting solution; extruding and spinning the casting solution through a spinneret to form a hollow fiber, then passing through an air gap to enter a cooling liquid to solidify to obtain a semi-finished product membrane; placing the semi-finished product membrane into an extracting agent to remove the diluent in the semi-finished product membrane through extraction; and drying the semi-finished product membrane after the diluent is removed to obtain the hollow fiber exchange membrane. The preparation method of the hollow fiber exchange membrane adds the antioxidant and the anti-volatilization agent into the diluent, solves the problems of discoloration and decomposition of the diluent caused by high temperature during high-temperature mixing and extrusion molding of the casting solution, the size, gas flux and mechanical properties of the prepared membrane are more stable, and the prepared hollow fiber exchange membrane has a better membrane structure and better performance.

The invention belongs to the technical field of biomedical materials, and particularly relates to a poly-4-methyl-1-pentene (PMP) gas-blood exchange membrane for an extracorporeal membrane oxygenation (ECMO) system, which realizes a long-acting antithrombotic function through a bionic interface construction technology. The invention aims to provide a bionic antithrombotic PMP gas-blood exchange membrane based on zwitter-ion gradient grafting, and through material and process innovation, the following problems existing in a traditional ECMO gas-blood exchange membrane: an antithrombotic coating is easy to fall off, and the long-term effect is insufficient; the risk of blood injury caused by dependence on heparin or anticoagulants; and the surface modification process destroys the membrane pore structure and air permeability.

The application provides a kind of main catalyst for preparing poly (4-methyl-1-pentene) and its application.The main catalyst for preparing poly (4-methyl-1-pentene) of the application has the structure shown in formula I, in formula I, R1 is selected from hydrogen or phenyl, when R1 is selected from phenyl, R1 is fused with the benzene ring in formula I to form anthracene ring;R2 is selected from methyl or isopropyl.The main catalyst of the application is applied in catalytic system for catalyzing the homopolymerization reaction of 4-methyl-1-pentene, the catalyst shows high catalytic activity, and the poly (4-methyl-1-pentene) prepared has high molecular weight, narrow molecular weight distribution and high stereoregularity, and has broad market application prospect.

This invention proposes a poly(4-methyl-1-pentene) resin based on a supported metallocene catalyst and its preparation method. Based on a stepwise loading process using a silanized porous support, by optimizing the type of support (such as SiO2, Al2O3, MCM-41), the amount of support added (3 to 15 times), and the stepwise loading sequence (co-catalyst first, then main catalyst), the catalyst activity, stability, and product performance are synergistically improved, providing an innovative solution for the conversion of supported catalysts into industrial-scale high-efficiency systems.

The invention provides a non-dissolution type antibacterial dressing and a preparation method thereof, and relates to the technical field of medical dressings. A non-dissolution type antibacterial dressing comprises a base material, micron-sized antibacterial microspheres and an endotoxin adsorption material, and the antibacterial microspheres and the endotoxin adsorption material are loaded inside and / or on the surface of the base material in one or more modes of physical wrapping, physical winding and chemical bond connection; the base material comprises polyvinyl alcohol fibers and / or chitosan sponge; the endotoxin adsorption material comprises modified styrene divinyl benzene affinity resin nano-structure particles and / or poly (4-methyl-1-pentene) fibers. The antibacterial microspheres can effectively kill bacteria at wounds and inhibit growth and reproduction of the bacteria, the endotoxin adsorption material has strong adsorption capacity, inflammatory response caused by endotoxin is reduced, the risk of wound infection is reduced, the antibacterial microspheres and the endotoxin adsorption material are mutually synergistic in performance, the antibacterial performance is excellent, wound adhesion is avoided, the risk of wound infection is reduced, and the wound healing effect is good. The wound healing is promoted.

The invention discloses a co-extruded polypropylene / poly (4-methyl-1-pentene) microporous hollow fiber as well as a preparation method and application thereof, and belongs to the technical field of hollow fibers. According to the method, polypropylene (PP) and poly-4-methyl-1-pentene (PMP) are compounded in a co-extrusion mode, PP forms an inner-layer microporous structure, PMP forms an outer-layer compact skin layer, and strength and leakage resistance are both considered. The preparation process comprises the steps of melt co-extrusion, cooling traction, annealing, hot stretching and sizing, and the process is simple, convenient and efficient. The obtained fiber has excellent gas permeability and plasma leakage resistance, is suitable for an in vitro membrane oxygenation (ECMO) technology, effectively prolongs the service life of an oxygenator, and solves the problems that the traditional PP fiber is easy to leak and the PMP fiber is low in strength.

This invention relates to the technical field of polymers, and more particularly to an impact-resistant poly(4-methyl-1-pentene) and its preparation method. A method for preparing impact-resistant poly(4-methyl-1-pentene) includes the following steps: first, a polymeric raw material comprising 4-methyl-1-pentene and an α,ω-nonconjugated diene undergoes polymerization reaction 1; then, an α-olefin is added and polymerization reaction 2 is carried out; the mixture is washed and dried to obtain the final product. The insertion of the α-olefin disrupts the crystallinity of part of the polymer, thereby controlling the polymer's crystallinity and imparting impact resistance. The introduction of the α,ω-nonconjugated diene forms a partially cross-linked network in the polymer structure, preventing excessive loss of other mechanical properties of the polymer. The combination of these two monomers improves the impact resistance of the PMP polymer while maintaining its excellent properties.

The application belongs to the technical field of crosslinking agents, and particularly relates to a strong-stability crosslinking agent BIPB and a preparation method thereof. The strong-stability crosslinking agent BIPB is prepared from the following raw materials in parts by weight: 20-30 parts of t-butyl hydroperoxide, 5-10 parts of BaSO4 / 4A zeolite composite material, 0.1-2 parts of polypropylene, 10-20 parts of a,a'-dihydroxy-1,3-diisopropylbenzene, 40-70 parts of acetic anhydride, and 0.1-2 parts of poly-4-methyl-1-pentene. In the preparation of the crosslinking agent BIPB, the BaSO4 / 4A zeolite composite material is introduced, so that the strong stability of the crosslinking agent BIPB is increased. The existence of BaSO4 affects the specific surface area and pore size distribution of 4A zeolite, thereby improving the activity of the crosslinking agent, accelerating the crosslinking reaction. The compounding of BaSO4 and 4A zeolite improves the dispersibility of BaSO4 and promotes the uniform distribution of the crosslinking agent BIPB.

The present invention addresses the problem of providing a separation membrane having low leakage properties while maintaining high gas permeability by using poly (4-methyl-1-pentene) having excellent solvent resistance and gas permeability. The present invention pertains to a separation membrane having poly (4-methyl-1-pentene) as the main component, having an average pore diameter of 0.10-1.00 nm in terms of the NKP curve, and a porosity of 40-70%, and having a pore diameter variation coefficient [alpha] i of 0-150% in all regions (1-5), where the regions (1-5) are divided into five regions sequentially at equal intervals in the thickness direction from one surface.

The invention discloses a preparation method and application of a mass-producible poly (4-methyl-1-pentene) dielectric energy storage film with high insulating strength, and belongs to the field of preparation processes of electrical element assembly materials. The invention aims to solve the problems that the conductivity loss is increased, the insulating property is degraded and the energy storage density is reduced under the operating condition of the existing dielectric film for the commercial capacitor. The method comprises the following steps: 1, preparing a pure poly (4-methyl-1-pentene) film; and 2, inducing the surface of the poly (4-methyl-1-pentene) film to be grafted with hydroxyethyl methylacrylate through ultraviolet radiation. After the surface of poly (4-methyl-1-pentene) is grafted with hydroxyethyl methylacrylate, the poly (4-methyl-1-pentene) has excellent insulating property and enhanced relative dielectric constant, so that the poly (4-methyl-1-pentene) shows excellent energy storage performance and is applied to capacitors; at room temperature, when the charge-discharge efficiency is greater than or equal to 90%, the energy storage density reaches 4.72 J / cm < 3 >, and the energy storage density can be increased by 42%.

The invention discloses a device for collecting and pre-treating microplastics in urine, and belongs to the technical field of pre-treatment and analysis and detection. The device comprises seven functional parts, namely a urine collecting horn mouth, a urine collector, a large-caliber filter membrane bottom support, a small-caliber filter membrane bottom support, a waste liquid bottle, a vacuum pump and a stainless steel buckle, the whole device is made of a poly-4-methyl-1-pentene (PMP) material or a stainless steel material, and interference on detection of micro-plastics in urine is effectively avoided. The device has the functions of urine collection and pretreatment at the same time, pretreatment operation can be completed without transferring a urine sample, and pollution and sample loss are reduced to the maximum extent. Aiming at the characteristic that a urine matrix is complex, a matched pretreatment reagent adding and digestion process is designed, urine is digested through hydrogen peroxide and potassium hydroxide reagents in a specific proportion, and matrix interference such as protein and mineral substances can be effectively removed. Due to the unique V-shaped collector design of the device, the filter membrane can be converted from a large caliber to a small caliber, and the detection time is shortened.

The application discloses an amidoimine monometal complex and application thereof in preparation of poly(4-methyl-1-pentene) wax. The structure of the amidoimine monometal complex is shown in formula (I): formula (I); wherein M is Ti, Zr or Hf, and R is H, methyl or isopropyl; the amidoimine monometal complex provided by the application is used for catalyzing homopolymerization of 4-methyl-1-pentene, and low-molecular-weight, narrow-distribution and high-melting-point poly(4-methyl-1-pentene) wax can be obtained; the poly(4-methyl-1-pentene) wax has good lubricating performance, temperature resistance and easy peeling performance.

According to the method of the present invention, poly-4-methyl-1-pentene with a lower molecular weight can be easily and safely produced by mixing poly-4-methyl-1-pentene and another type of polyolefin (I) and conducting melt-stirring at a temperature equal to or higher than the melting points of both the poly-4-methyl-1-pentene and the polyolefin (I).

The invention belongs to the technical field of hollow fibers, and discloses a co-extruded asymmetric poly (4-methyl-1-pentene) hollow fiber as well as a preparation method and application thereof. The method comprises the following steps: plasticizing, melting and extruding a mixture of poly (4-methyl-1-pentene) with a low melt index, poly (4-methyl-1-pentene) with a high melt index and polyolefin by adopting a twin-screw extruder, cooling, pelletizing and drying to obtain a polymer blend; the preparation method comprises the following steps: respectively adding a blend of poly (4-methyl-1-pentene) with a high melt index and a polymer into different extruders, carrying out co-extrusion molding, cooling and traction to obtain primary fibers of poly (4-methyl-1-pentene) hollow fibers; the primary fiber of the fiber is subjected to stretching and pore forming at the temperature of 60-90 DEG C and heat setting at the temperature of 70-100 DEG C, the co-extruded asymmetric poly (4-methyl-1-pentene) hollow fiber is obtained, the outer layer is poly (4-methyl-1-pentene) with the high melt index, the inner layer is a polymer blend, and the co-extruded asymmetric poly (4-methyl-1-pentene) hollow fiber can be applied to the field of in-vitro membrane lung oxygenators.

The invention relates to the technical field of biomedical materials, in particular to a surface modification method of a poly (4-methylpentene) (PMP) hollow fiber membrane, the blood compatibility of the material is synergistically improved through a polydopamine (PDA) coating and a zwitter-ion grafting technology, and the surface modification method is suitable for blood contact instruments such as extracorporeal membrane oxygenation (ECMO) and the like. The invention provides a dopamine-mediated zwitterionic modified PMP membrane, which comprises a PMP membrane and a modification layer on the surface of the PMP membrane, and the modification layer comprises a polydopamine intermediate layer formed on the surface of the PMP membrane through dopamine in-situ oxidation auto-polymerization and a zwitterionic polymer brush grafted on the polydopamine intermediate layer.

The application discloses a kind of low-density high-strength heat insulation plate and preparation method thereof, the low-density high-strength heat insulation plate includes the following mass percentage of components: poly (4-methyl-1-pentene) 40%~80%, hollow glass microsphere 1%~40%, natural fiber 1%~40%, coupling agent 0.1%~2%.The application selects hollow glass microsphere to reduce the specific gravity and thermal conductivity of poly (4-methyl-1-pentene), improve the hardness and high temperature resistance of TPX, reduce the breakage rate of hollow glass microsphere by natural fiber, so that the heat insulation plate prepared can be used at high temperature (≥150 DEG C), and has the performance of recyclable, light, low thermal conductivity, low deformation.

This invention discloses a release film for lamination and its preparation method, belonging to the field of electronic products. From top to bottom, it comprises: a first release layer, a first adhesive layer, a resist layer, a second adhesive layer, and a second release layer. Both the first and second release layers are poly-4-methyl-1-pentene; the first and second adhesive layers are polyolefins or modified polyolefins; and the resist layer is polyester or modified polyolefin. The release film for lamination of this invention can replace the high-cost TPX series release films, comprehensively utilizing the release properties of TPX and the stiffness of polyester, achieving a perfect balance between operability and lamination characteristics.

Provided is, by using poly(4-methyl-1-pentene), a separation membrane that achieves both high gas permeability and low leakage properties for a deaeration method for removing a dissolved gas from a liquid and a gas exchange method for exchanging a dissolved gas in a liquid with a gas component in a gas phase. This separation membrane contains poly(4-methyl-1-pentene) as the main component. The porosity of the entire separation membrane is 30-70%. The separation membrane has a functional layer on at least one surface side thereof. An alignment direction in which the degree of alignment is within the range of 1.5-2.5 is present in the surface of the functional layer. The degree of crystal alignment in the surface of the functional layer of the separation membrane as measured by a wide-angle X-ray diffraction method is 0.20-0.60. The crystallite size in the surface of the functional layer of the separation membrane is 10-20 nm.

The invention relates to a high-performance environment-friendly oxygen separation membrane and a preparation method thereof, and aims to provide an efficient and environment-friendly oxygen separation solution for the fields of medical treatment, chemical engineering and the like so as to overcome the defects that a traditional oxygen separation technology is high in energy consumption and complex in equipment, and an existing gas separation membrane is insufficient in selectivity, not environment-friendly in modification process and difficult to produce on a large scale. Hybrid nanoparticles of a metal organic framework (MOFs) and a covalent organic framework (COFs) are introduced into a polytetramethyl-1-pentene (PMP) matrix, a wet spinning technology is combined with a green solvothermally induced phase separation (TIPS) method, and functional modification of plasma grafting and electrochemical deposition is combined, so that the PMP film with a multifunctional surface is formed. The method is characterized in that a bio-based solvent is innovatively selected to replace a traditional toxic diluent, and hydrophobicity and oxygen adsorption capacity are enhanced through surface functionalization; the MOFs / COFs hybrid system is introduced into PMP membrane preparation for the first time, full-life-cycle environment-friendly design is achieved, remarkable advantages are provided for efficient oxygen separation from green bio-based solvent selection to waste recycling, and the dual-carbon target is assisted to be achieved.

This application discloses a polyester film for low-haze, high-transparency release membranes and its preparation method. The polyester film includes an upper surface layer, a lower surface layer, and a core layer. The upper and lower surface layers are composed of the following raw materials in the following mass percentages: 8%-10% anti-adhesion particles, 90%-92% polyester chips with a refractive index of 1.63-1.65, and the anti-adhesion particles are poly-4-methyl-1-pentene with a refractive index of 1.46. The core layer is composed of the following raw materials in the following mass percentages: 5%-7% antistatic particles, 92-95% polyester chips with a refractive index of 1.63-1.65, and the antistatic particles are zinc oxide with a refractive index of 2.0. This application uses high-refractive-index polyester chips as a base, low-refractive-index anti-sticking particles as the surface layer, and high-refractive-index antistatic particles as the core layer, forming a combination of a high-refractive-index core layer and a low-refractive-index surface layer. By using refractive index matching, the overall light transmittance is improved by changing the propagation characteristics of light waves. At the same time, the organic anti-sticking particles used in the surface layer can effectively avoid the influence of inorganic particles on haze, and can effectively reduce the haze of the film.

This invention discloses a poly(4-methyl-1-pentene) aerogel, its preparation method, and its applications. By using camphene as a solvent for poly(4-methyl-1-pentene), a thermally induced phase separation process is initiated by controlling the cooling rate, followed by conventional drying to obtain a white aerogel with good self-supporting properties. The preparation method is simple and mild, requiring no complex processes or expensive equipment, and can be produced on a large scale. The aerogel possesses a rich microporous structure and extremely high solar reflectivity, making it suitable for radiative cooling for passive cooling. Furthermore, the aerogel prepared by this method exhibits excellent superhydrophobicity and thermal insulation properties, enhancing its potential for outdoor applications.

The invention provides a catalyst as well as a preparation method and application thereof. The catalyst provided by the invention has a structure as shown in a formula 1, is used for polymerization reaction of olefin, has high catalytic activity, no cyclopentadienyl ring structure and more open space structure, is suitable for high-activity polymerization of large-steric-hindrance polyolefin, and has the catalytic activity of 1097-1420 kg PMP / (mmol Hf.h) when being used for polymerization reaction of 4-methyl-1-pentene. The molecular weight of the prepared poly (4-methyl-1-pentene) material is not less than 3 million g / mol, the molecular weight distribution is 1.5-3.5, the crystallinity is 50%-80%, and the poly (4-methyl-1-pentene) material has excellent mechanical properties and high temperature resistance.

The application provides a hybrid flat membrane of poly-4-methyl-1-pentene / three-dimensional covalent organic framework and a preparation method and application thereof. The method comprises the following steps: weighing formula materials; preparing a casting solution of the hybrid membrane; and forming the hybrid flat membrane. The hybrid flat membrane has the characteristics of large specific surface area, high density of functional groups and high mechanical properties. The three-dimensional covalent organic framework is blended with poly-4-methyl-1-pentene, and a hybrid membrane is prepared by using a thermally induced phase separation method. The embedding of the three-dimensional covalent organic framework provides additional adsorption and transmission channels for oxygen and carbon dioxide, significantly improves the gas permeability of the hybrid flat membrane, the three-dimensional covalent organic framework and the poly-4-methyl-1-pentene molecular chain are intertwined, the mechanical properties of the hybrid flat membrane are improved, and meanwhile, the complex regulation and control of the membrane structure for improving the gas transmission performance and the mechanical properties of the poly-4-methyl-1-pentene hybrid flat membrane in the current production process is avoided.

According to the poly (4-methyl-1-pentene) resin based on the non-metallocene catalyst and the preparation method of the poly (4-methyl-1-pentene) resin, based on a solution polymerization technology of a non-metallocene catalyst system which has high catalytic activity and is relatively simple to synthesize, the non-metallocene catalyst is used for catalyzing homopolymerization of 4-methyl-1-pentene or copolymerization of 4-methyl-1-pentene and other monomers; the problems of complex synthesis and high cost of a metallocene catalyst can be solved, and the problems of low activity of a Z-N catalyst and the like can also be solved. Besides, due to the unique physical and chemical structure of the non-metallocene catalyst, the PMP resin can have higher molecular weight, narrower molecular weight distribution and higher melting point, and has important significance for realizing large-scale production of the poly (4-methyl-1-pentene) resin; therefore, the non-metallocene catalyst has huge potential in actual production of PMP resin.

The application provides a poly-4-methyl-1-pentene (PMP) membrane with a gradient pore structure and a preparation method thereof, which is suitable for an extracorporeal membrane oxygenator (ECMO). The PMP membrane is prepared by physical blending of PMP and polyvinylidene fluoride (PVDF) and multi-stage electrospinning process, and is formed into a composite membrane with an asymmetric gradient pore structure. The dense layer effectively inhibits plasma leakage, and the porous layer optimizes the gas exchange efficiency. The preparation method of the application is carried out at normal temperature and pressure, overcomes the limitation of high-temperature processing of traditional PMP membranes, and significantly improves the mechanical strength and gas permeability of the membrane. The PMP membrane has excellent biocompatibility, long-term stability and anti-plasma leakage performance, and can meet the long-term use requirement of ECMO, and provides a better solution for artificial lung membrane technology.

The invention provides a poly (4-methyl-1-pentene) (PMP) membrane with a gradient pore structure and a preparation method of the poly (4-methyl-1-pentene) membrane. The poly (4-methyl-1-pentene) membrane is suitable for an in-vitro membrane type artificial lung (ECMO). According to the PMP membrane, PMP and polyvinylidene fluoride (PVDF) are physically blended, multi-walled carbon nanotubes are combined for reinforcement, and the composite membrane with an asymmetric gradient pore structure is prepared through a multi-stage electrostatic spinning process. Wherein the compact layer effectively inhibits plasma leakage, and the porous layer optimizes the gas exchange efficiency. The preparation method is carried out at normal temperature and normal pressure, the limitation of high-temperature processing of a traditional PMP film is overcome, and meanwhile, the mechanical strength and the gas permeability of the film are remarkably improved. The PMP membrane has excellent biocompatibility, long-term stability and plasma leakage resistance, can meet the long-term use requirement of ECMO, and provides a better solution for an artificial lung membrane technology.

The invention discloses a poly (4-methyl-1-pentene) graft and a preparation method of the poly (4-methyl-1-pentene) graft. The graft is prepared by carrying out free radical polymerization on raw materials of poly (4-methyl-1-pentene) and a grafting monomer in a mass ratio of 100: (3-30) in a mixed solvent, the mixed solvent comprises a grafting solvent and an auxiliary solvent, the grafting solvent is an organic solvent without benzyl hydrogen, and the auxiliary solvent is selected from at least one of ethyl acetate, dichloromethane, trichloromethane, acetone, carbon tetrachloride and trichloroethylene; the graft monomer includes an unsaturated carboxylic acid monomer. According to the preparation method, the high-polarity poly 4-methyl-1-pentene graft with the grafting rate of more than 3.5% can be prepared, and the high-polarity poly 4-methyl-1-pentene graft is matched with modified TPX to be applied to the fields of high-adhesion composite films, flame-retardant cable sheaths and the like with strict requirements on interfacial compatibility and durability.

Provided is an electret having improved charge stability. An electret according to the present invention has a peak temperature of 140°C or higher according to a TSC method after being charged in an electric field. The electret contains a nitrogen-containing compound, and in 100 parts by mass of resin contained in the electret, 80-99 parts by mass are polypropylene, and 1-20 parts by mass are poly-4-methyl-1-pentene.

A degassing method of removing a dissolved gas from a liquid and a gas exchange method of exchanging a dissolved gas in a liquid and a gas component in a gas phase include a method using a separation membrane. To provide a separation membrane having solvent resistance while maintaining high gas permeability using poly(4-methyl-1-pentene) excellent in solvent resistance and gas permeability. To achieve the object, there is provided a separation membrane containing poly(4-methyl-1-pentene) as a main component and including a surface layer and an inner layer, at least one surface layer having lamellar crystals, wherein micropores are provided on the surface layer having the lamellar crystals, an opening ratio is 0.1% to 10% when a ratio of the micropores to a membrane surface is taken as the opening ratio and the membrane surface is 100%, and an average pore size of the micropores is 3 nm to 30 nm.

The invention provides a preparation system of poly (4-methyl-1-pentene) (PMP). The preparation system is characterized by comprising a mixer and a polymerization reaction kettle communicated with the mixer, the catalyst preparation system is communicated with the polymerization reaction kettle through the catalyst conveying system; the centrifugal machine is communicated with the polymerization reaction kettle; the centrifugal machine is communicated with the two-stage vibration drying bed and the fine powder ultrafiltration oil absorption device; wherein the fine powder ultrafiltration oil absorption device comprises an extrusion plate, a fine powder ultrafiltration membrane and an oil absorption layer which are arranged in sequence. According to the preparation system of the poly-4-methyl-1-pentene (PMP), provided by the invention, the energy consumption is reduced, and a PMP product which is low in volatile component and meets the product index requirement can be produced.