1057 results about "BoPET" patented technology

The present invention discloses a high-performance base film for composite current collector and a preparation method thereof, the method comprising the following steps: S1, mixing PP masterbatch with composite modified auxiliary particles, melt extruding, cooling to obtain a cast sheet; S2, preheating the cast sheet and biaxially stretching it to obtain a stretched sheet; S3, heat setting, cooling, and obtaining a rough product; S4, performing surface corona treatment on the rough product; S5, winding, aging treatment, and slitting to obtain a high-performance base film for composite current collector. The present invention can well solve the problem of poor copper adhesion of conventional PP base films, and can also significantly improve the flame retardant properties and tensile strength of the PP base film, which is conducive to promoting the large-scale application of PP materials in composite current collector base films.

The invention relates to the technical field of current collectors, in particular to a flame-retardant composite current collector and a preparation method thereof.The flame-retardant composite current collector is composed of a base film layer, metal film layers deposited on the two faces of the base film layer and flame-retardant layers formed by curing flame-retardant coatings and coated on the surfaces of the metal film layers; the preparation method comprises the following steps: S1, mixing the modified polypropylene resin, the reinforcing component, the antioxidant, the lubricant, the coupling agent and the compatilizer to obtain a mixture; s2, carrying out melt extrusion and tape casting on the mixture, and stretching through a two-way stretching process to form a base film layer; s3, metal film layers are deposited on the two faces of the base film layer, and hot press molding is conducted; s4, coating a flame-retardant coating, drying and curing to obtain the flame-retardant composite current collector, the prepared flame-retardant composite current collector has excellent flame retardance, excellent mechanical property and thermal aging resistance and high peel strength, the binding force of the metal film layer and the base film layer is firm, and the quality and safety of the composite current collector are effectively improved.

The invention relates to the technical field of capacitor films, in particular to a high-temperature-resistant polypropylene capacitor film and a preparation method thereof.The high-temperature-resistant polypropylene capacitor film is prepared from, by weight, 94-98 parts of polypropylene resin, 1-3 parts of filler-doped modified balance adjusting agent, 0.5-2 parts of boron nitride-glass fiber combined agent, 0.05-0.4 part of nucleating agent, 0.2-0.4 part of antioxidant and 0.1-0.4 part of silane coupling agent; the high-temperature-resistant polypropylene capacitor film is obtained through the processes of melting extrusion molding, cooling shaping, preheating, two-way stretching, heat shaping, rolling and the like of the raw material composition. The polypropylene resin, the nucleating agent, the antioxidant and the silane coupling agent are blended, the filler-doped modified balance adjusting agent and the boron nitride-glass fiber coupling agent are added, and the raw materials are blended and coordinated, so that high feasibility of a two-way stretching process is guaranteed, breakdown resistance, mechanical strength and dielectric loss performance of the product are optimized, and the product has good mechanical properties. And meanwhile, the high-temperature-resistant and corrosion-resistant stability effects are remarkable.

The invention relates to the technical field of composite film preparation, in particular to a multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film and a preparation method thereof.The multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film comprises a base material layer, a gas barrier layer, a bonding transition layer and a nano ceramic functional coating; the base material layer comprises the following components in parts by mass: 80-100 parts of biaxially oriented polypropylene; 20 to 30 parts of metallocene linear low density polyethylene; 5 to 8 parts of nano titanium dioxide; 0.5 to 1 part of beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid; and 0.3 to 0.6 part of calcium stearate. Through the multi-layer co-extrusion and gradient curing technology and the five-layer co-extrusion technology, it is ensured that the thickness of a base film is uniform and interlayer bonding is firm, the adhesive force of the coating is enhanced through plasma surface treatment, and activity retention and uniform distribution of functional components are guaranteed through the segmented curing strategy of the nano ceramic coating; compared with a traditional hot-pressing compounding or solvent coating process of the composite film, the energy consumption and the solvent residue risk are greatly reduced, meanwhile, the production efficiency and the product consistency are improved, and large-scale application is provided for medicine packaging.

The invention relates to the technical field of control systems, in particular to a production process optimization control system and method for a heat shrink film. The method comprises the following steps: obtaining resin characteristic parameters of a heat shrink film raw material, and constructing an initial digital twinborn model by using the resin characteristic parameters; acquiring real-time production data, and updating the initial digital twinborn model by using the real-time production data to obtain a complete digital twinborn model; and performing melt ultrasonic-assisted homogenization and two-way stretching process simulation based on the digital twin model, and performing optimization analysis by using a simulation result to generate optimized process parameters. By constructing and updating the digital twinborn model, the melt uniformity and process parameter optimization are accurately controlled, the quality consistency and stability of the thermal shrinkage film are improved, and the product is ensured to meet the mechanical, optical and thermal shrinkage performance requirements.

This case relates to a self-healing optical film and its preparation method. The optical film is made by adding a nanoparticle suspension to PET masterbatch as the main material during its melt extrusion process, resulting in a cast sheet. After biaxial stretching, a self-healing coating liquid is coated online, followed by shaping and cooling. The nanoparticle suspension includes nano-titanium oxide, MAH-PET polymer, ATO nanoparticles, and titanate coupling agent. The self-healing coating liquid is produced by core-shell emulsion polymerization, forming a nano-silica hard core and an acrylate functional monomer polymer soft shell. This invention adds the nanoparticle suspension by in-situ feeding in the middle of the extruder, reducing steps, improving dispersion uniformity, and making the film surface smoother. Then, the self-healing coating liquid is applied online after longitudinal stretching and before transverse stretching, forming a film on the film surface, improving the hardness and scratch resistance of the film material, enabling rapid self-healing at room temperature, strong stability, and avoiding the occurrence of rainbow patterns.

The invention belongs to the technical field of high polymer materials, and particularly relates to a PVB (Polyvinyl Butyral) film and a preparation method thereof. The PVB film provided by the invention is prepared from the following components in parts by mass: 100 parts of PVB resin, 33 to 36 parts of triethylene glycol di-2-ethylhexoate, 7 to 9 parts of integrated anti-radiation toughening filler, 1 to 2 parts of organic montmorillonite, 0.8 to 1.2 parts of composite coupling agent, 0.5 to 1 part of ultraviolet light absorber, 0.6 to 0.8 part of antioxidant and 0.8 to 1 part of heat stabilizer. The integrated anti-radiation toughening filler adopts a core-shell structure, the anti-radiation core is composed of bismuth oxide and tungsten oxide according to the mass ratio of 3: 1, and the elastic coating layer is maleic anhydride grafted modified POE. The preparation method comprises the steps of pre-dispersion treatment, component mixing, melt extrusion, film casting, graded cooling, two-way stretching and the like. Through the core-shell structure design of the integrated anti-radiation toughening filler and the optimized processing technology, the anti-radiation performance and the toughening performance are synergistically improved, and the prepared film has the advantages of excellent anti-radiation effect, high toughness and good transparency.

The invention relates to the field of materials, and provides an asynchronous stretching polytetrafluoroethylene film with high aperture uniformity and a preparation method thereof. The method comprises the following steps: mixing polytetrafluoroethylene dispersion resin with mixed lubricating oil, curing, and then obtaining the polytetrafluoroethylene film through pre-pressing extrusion, multi-module longitudinal stretching and expanding and sizing, wherein the longitudinal stretching module is provided with three sections of temperature zones which are sequentially and adjacently connected, namely a core stretching deoiling zone, a high-temperature activation zone and an annealing rolling zone. Oil-containing stretching is realized by matching mixed lubricating oil with gradient temperature configuration and precise control of stretching speed in a longitudinal stretching stage, and meanwhile, controllability of pore size and high uniformity of pore size are realized by matching proper process parameters such as two-way stretching temperature, speed and multiple; the membrane can be applied to various different scenes as a filtering material.

The invention belongs to the field of polymeric membranes. The invention relates to a BOPLA (biaxially-oriented polylactic acid) film with high stretching ratio and a preparation method thereof. The packaging film comprises the following raw materials in parts by weight: 80-90 parts of PLA; 10 to 20 parts of PPC-P (Polypropylene Chloride-P); 10-15 parts of a plasticizer; 3.0 to 5.0 parts of a chain extender; 0.3 to 0.5 part of an antioxidant; 0.5 to 1.0 part of a lubricant; 0.1 to 0.3 part of an anti-hydrolysis agent; wherein the total mass of the PLA and the PPC-P is 100 parts; the preparation method comprises the following steps: mixing, extruding and plasticizing the raw materials according to the formula, and carrying out an asynchronous two-way stretching process, heat setting, traction, slitting and rolling. According to the present invention, the defects of mechanical property degradation and poor optical property of the PLA under the high stretching rate in the prior art can be effectively solved, and the great application potential is provided.

The present invention belongs to the technical field of polymer films, and specifically relates to a polypropylene film for lithium battery current collector and a preparation method thereof. The polypropylene film comprises an upper layer, an intermediate layer and a lower layer; by weight, the components of the upper layer and the lower layer each comprise 70-80 parts of isotactic polypropylene and 20-25 parts of modified polystyrene; the components of the intermediate layer comprise 80-85 parts of isotactic polypropylene and 15-20 parts of cycloolefin copolymer; firstly, the components of the upper layer, the intermediate layer and the lower layer are uniformly mixed, and then the main machine and the auxiliary machine of a three-layer co-extrusion casting machine are added for melt extrusion to obtain a polypropylene film; then, the polypropylene film is subjected to biaxial stretching to obtain a polypropylene film; the obtained composite polypropylene film has good mechanical properties and dielectric properties, high thermal stability, and is more suitable for lithium battery current collectors.

The invention discloses a microporous diaphragm for a low-electrical-impedance lithium battery and a preparation method of the microporous diaphragm. The diaphragm comprises: a base film layer, wherein the base film layer is of a microporous structure formed by biaxially stretching polypropylene and / or polyethylene; the surface of the base film layer is coated with the functional coating, and the functional coating contains mixed slurry of inorganic nanoparticles and a binder; the surface modification layer is formed by introducing a hydrophilic electrolyte group on the surface of the functional coating through plasma treatment or chemical grafting. The base membrane layer forms a uniform micropore structure through a two-way stretching process, the functional coating is formed by compounding nano silicon dioxide or aluminum oxide and polyvinylidene fluoride according to a specific proportion, a porous layer with gradient pore diameter is formed, the pore size of the porous layer is smaller than that of the base membrane layer, and efficient permeation of electrolyte is ensured. Electrolyte-philic groups such as sulfonic groups are introduced into the surface modification layer, so that the wettability of the diaphragm to an electrolyte is remarkably improved. During preparation, the base membrane is formed through melt blending, two-way stretching and pore-forming agent extraction, and then the functional layer is constructed through slurry coating and a low-temperature plasma treatment or sulfonation process. The diaphragm combines gradient aperture design, inorganic filler enhancement and surface chemical modification, and realizes low impedance, high thermal stability and excellent mechanical strength.

The invention provides a medical packaging material and a preparation method thereof.The preparation method comprises the steps that S100, polypropylene, maleic anhydride grafted co-polypropylene, peroxide and filler are mixed, then melt extrusion and two-way stretching are conducted, and a printing layer is obtained; s200, respectively preparing a barrier layer and a heat sealing layer; and S300, the heat sealing layer, the blocking layer and the printing layer are sequentially stacked from inside to outside, and the packaging material is obtained. Through the preparation method of the packaging material, the prepared packaging material has excellent barrier property and antibacterial property while resisting high temperature, and can meet the requirements of the medical field.

The invention relates to the technical field of biaxially oriented films, in particular to a low-noise tackifying non-adhesive film for digital printing and a preparation method thereof.The low-noise tackifying non-adhesive film for digital printing comprises a release functional layer, a core layer and a tackifying hot melt adhesive layer which are sequentially arranged, the release functional layer comprises 0.5-2.5 wt% of amino siloxane grafted polypropylene and homo-polypropylene, and the surface energy of the release functional layer is 24-26 dyn / cm; the core layer comprises homo-polypropylene; the tackifying hot melt adhesive layer is prepared from an ethylene-vinyl acetate copolymer A, 5 to 10 weight percent of ethylene-vinyl acetate copolymer B and 0.2 to 0.5 weight percent of polysiloxane elastomer. The low-noise tackifying glue-free film for digital printing belongs to a biaxially oriented polypropylene film, does not need secondary coating processing, is energy-saving and environment-friendly, is smooth to wind and unwind in the production and application processes, is low in unwinding noise, effectively ensures the compounding fastness between the film and a printed piece, and is high in practicability. The method is especially suitable for film coating of digital printing pieces with high silicone oil and wax content.

The invention provides a biaxially oriented nylon light conversion film as well as a preparation method and application thereof. A nylon / flaky nano silicon dioxide blend is used as a supporting layer, a nylon / boric acid functionalized terbium metal organic framework material blend is used as a variable light conversion characteristic layer, and the two-way stretching nylon light conversion film is obtained through synchronous two-way stretching. The film has dripping and variable light conversion characteristics, and can convert ultraviolet light into red orange light or blue light.

The invention relates to the technical field of capacitor films. The invention discloses a preparation process of a high-performance polypropylene capacitor film. The preparation process comprises the following steps: A1, preparing a polypropylene capacitor film; a2, carrying out surface cleaning and activation pretreatment on the polypropylene capacitance film; a3, evaporating a gradient modified layer on the surface of the pretreated polypropylene capacitance film; a4, carrying out laser plasma synergistic treatment and crystallinity regulation and control on the modified polypropylene capacitor film; and A5, coating the outer layer of the modified polypropylene capacitance film with a functional layer, and carrying out annealing post-treatment to prepare the high-performance polypropylene capacitance film. The mechanical strength and the electrical stability are improved through nano filler dispersion, two-way stretching and crystallinity regulation and control; through the collaborative design of surface cleaning and activation and a gradient functional layer, excellent interface bonding force and environmental adaptability are given; and by means of technologies such as multi-source evaporation and laser plasma co-processing, precise regulation and control and diversified expansion of the performance are achieved, the method is suitable for various scenes, and the process repeatability is good.

The invention belongs to the technical field of dielectric film materials, and particularly relates to a biaxially oriented polypropylene film and a preparation method thereof.The biaxially oriented polypropylene film comprises a base film layer and a non-continuous film layer, the base film layer is a polypropylene film layer, a protruding structure is arranged on the working face of the base film layer, and the non-continuous film layer is arranged on the working face of the base film layer. The non-continuous film layer is attached to the protruding structures. The biaxially oriented polypropylene film has the advantages of being high in bonding strength with the metal layer and good in mechanical strength.

The invention discloses a polytetrafluoroethylene microporous membrane as well as a preparation method and application thereof, and belongs to the technical field of polytetrafluoroethylene microporous membranes. According to the invention, the polytetrafluoroethylene microporous membrane added with different amounts and different types of lubricants is prepared by a thermomechanical two-way stretching method, and the pore structure is researched. According to the invention, the entanglement density, the average pore size, the porosity, the hydrophobic property and the mechanical property can be regulated and controlled by changing the quantity and the type of the lubricant. And a new idea is provided for preparing the high-performance PTFE biaxially oriented film, and the method has a good application prospect.

The invention relates to the field of plastic film production equipment, in particular to a film coiling machine and application thereof, and more particularly relates to a film coiling method on two-way stretch film equipment. The thin film coiling machine comprises a conveying module and a coiling module, the conveying module is adjacent to the coiling module, the conveying module comprises a tension roller and a contact roller, and the conveying module is used for conveying a thin film to the coiling module; the winding module comprises a winding roller and is used for continuously winding the thin film. According to the thin film winding method, the limiting torque of a winding roller motor is jointly influenced by various parameters, accurate measurement and calculation of the parameters provide an accurate control means for two-way stretching, and the formula tension, the real-time winding diameter of the winding roller, the acceleration and deceleration compensation torque, the friction torque of the winding roller and the PID compensation torque act synergistically, so that the two-way stretching precision is improved. And the motor can respond to the tension requirement of the film in real time in the two-way stretching process.

The invention discloses polypropylene film stretching detection equipment, which belongs to the technical field of film stretching detection, and has the technical key points that the polypropylene film stretching detection equipment comprises a bottom plate, and transmission and clamping control of a film can be well completed through an arranged positioning rotary clamping mechanism, so that subsequent film detection treatment is facilitated; meanwhile, one-way stretching detection and two-way stretching detection of the polypropylene film can be achieved, the detection time is greatly saved, the detection efficiency is improved, high universality and applicability are achieved, the position of a detection head does not need to be manually adjusted through the arranged detection mechanism, the detection head can be rapidly moved to a proper position, and the detection efficiency is improved. The detection preparation time is greatly shortened, the detection continuity and efficiency are improved, the manual intervention is reduced, the working intensity and the operation difficulty of operators are reduced, the working efficiency is remarkably improved, and the device has the advantages of being convenient to replace and clamp the film roller, capable of biaxially stretching the film and convenient to detect.

The invention discloses a high-toughness biaxially oriented nylon film and a production method thereof. Comprising the following raw materials in parts by weight: 40-50 parts of copolymerized nylon resin, 10-20 parts of nylon 12, 15-25 parts of thermoplastic polyamide elastomer, 3-6 parts of nanofiller, 1-3 parts of coupling agent, 10-20 parts of reinforced fiber, 5-8 parts of additive, 3-7 parts of ethylene-methyl acrylate-glycidyl methacrylate terpolymer and 6-10 parts of modified cellulose nanocrystal. The invention relates to a flame-retardant polyamide resin, which is prepared from the following components in parts by weight: 2-4 parts of amino-terminated hyperbranched polyamide and 1-3 parts of 3, 3 '-diamino-4, 4'-difluorodiphenyl sulfone. The film is high in tensile strength, good in tear resistance and excellent in barrier property and low-temperature impact resistance.

The invention discloses a high-toughness polyethylene composite film and a preparation method thereof, and belongs to the field of high polymer materials. The outer layer is prepared from linear low-density polyethylene, an ethylene-butyl acrylate copolymer, an antioxidant 1010 and an ultraviolet light absorber UV-531; the middle layer is prepared from linear low-density polyethylene, a polyolefin elastomer, an ethylene-butyl acrylate copolymer, stearic acid modified calcium carbonate, an antioxidant and an ultraviolet light absorber; and the inner layer is composed of linear low-density polyethylene, an ethylene-butyl acrylate copolymer, an antioxidant 1010 and an ultraviolet light absorber UV-531. Drying the raw materials; mixing heavy calcium carbonate with stearic acid; each layer is mixed at a low speed according to a ratio; and carrying out three-layer co-extrusion film blowing, two-way stretching, corona and annealing. The surface tension of the composite film reaches 40 mN / m, the maximum longitudinal and transverse tensile strength is 23 MPa, the tearing strength is 120 kN / m, the elongation at break is 700%, and the performance of the composite film is superior to that of traditional casting and blow molding process products.

The invention provides an aromatic polyoxadiazole film and a preparation method and application thereof.The preparation method of the aromatic polyoxadiazole film comprises the following steps that fuming sulfuric acid serves as a solvent and a dehydrating agent, terephthalic acid and hydrazine sulfate serve as monomers, benzoic acid serves as a chain end-capping agent, step-by-step feeding is adopted, and three-stage condensation polymerization is conducted to obtain the aromatic polyoxadiazole film. An aromatic polyoxadiazole resin solution is obtained; pressurizing, orienting and conveying to a forming die head, extruding to obtain an acid-containing primary cast film, and solidifying and forming in a single-stage coagulating bath to obtain a polyoxadiazole wet film; washing the acid-free polyoxadiazole wet film to obtain an acid-free polyoxadiazole wet film; then biaxial stretching is conducted, heat setting treatment is conducted, and the aromatic polyoxadiazole film is obtained. After the aromatic polyoxadiazole film prepared by the method is carbonized and graphitized, the problem of'powder falling 'is avoided, and the prepared super-crystal graphite film is flat and uniform in appearance, more complete in crystal structure, higher in heat-conducting property, free of pollution to electronic elements and good in application prospect.

The invention relates to the technical field of pipes, and discloses an environment-friendly high-strength corrosion-resistant PE pipe production process which comprises the following steps: raw material pretreatment: mixing high-density polyethylene, low-density polyethylene, borate, polyvinylidene fluoride, epoxidized soybean oil and an antioxidant in proportion, and performing melting pretreatment to form a uniform mixture; dynamic cross-linking extrusion molding: carrying out dynamic cross-linking extrusion on the pretreated mixture in a three-zone temperature control extruder, wherein three zones are respectively a dynamic bond activation zone, a chain orientation induction zone and a dynamic locking zone; and carrying out on-line molecular chain orientation stretching: heating the extruded semi-cured pipe, and carrying out one-way or two-way stretching under a constant-temperature condition. Through a dynamic boron-oxygen cross-linked network extrusion process, an on-line molecular chain orientation stretching technology, a partitioned cooling process and a synergistic effect of a polyvinylidene fluoride thin layer coated on the surface, high strength, toughness and balanced inner and outer layer performance of the pipe are effectively realized.

The invention relates to a preparation method of a low-precipitation low-volatility polyester film, which comprises the following steps: esterifying a diol monomer and an aryl diacid monomer in the presence of a catalyst, then carrying out vacuum polycondensation, adding dipentaerythritol phosphate which accounts for 0.5-0.8 wt% of the mass of the diol monomer when the intrinsic viscosity of a system product reaches 0.52-0.57 dL / g in the polycondensation stage, and carrying out vacuum polycondensation to obtain the low-precipitation low-volatility polyester film. Performing post-treatment to obtain a core layer polyester raw material; the core layer polyester raw material and the surface layer polyester raw material are respectively added into a melt extruder for three-layer co-extrusion, and then the ABA type three-layer composite structure polyester film is obtained through two-way stretching. After the polyester film obtained by the preparation method is subjected to high temperature and / or high humidity, the haze improvement value is very low. The method is very suitable for the field with high optical performance requirements. The preparation method provided by the invention can be completed on the basis of original polyester master batch synthesis equipment, does not need to add extra large expensive equipment and process, and has the advantage of industrialization.

The invention relates to the technical field of films, in particular to a high-surface tension aluminized base film and a preparation method thereof. The method comprises the following steps: grafting modified fumed silica with a silane coupling agent KH-570, and grafting a ternary polymerization shell layer composed of 2-acrylamide-2-methylpropanesulfonic acid, lauryl methacrylate and glycidyl methacrylate on the surface of the modified fumed silica to obtain organic anti-sticking silica; secondly, synthesizing an aromatic sulfonated polyester prepolymer, loading nano titanium dioxide, and carrying out melt blending extrusion with polypropylene to form polar cluster polypropylene master batches; and finally, blending polypropylene resin, the master batch and maleic anhydride grafted polypropylene, and carrying out melt extrusion, air cooling and slow cooling and two-way stretching molding. The obtained base film is high in surface tension, high in aluminized layer adhesive force, excellent in oxygen and water vapor barrier property, good in thermal stability and suitable for the field of high-end packaging.

The invention relates to a biaxially oriented polypropylene composite film for a capacitor and a preparation method of the biaxially oriented polypropylene composite film. The biaxially oriented polypropylene composite film is of an ABA three-layer structure; wherein the layer A is prepared from the following raw materials: PP, a nucleating agent and a composite filler of MAH-g-PP and nanoparticles; the layer B is prepared from the following raw materials: PET master batch, modified silicon dioxide and a brush polymer. According to the preparation method, the three-layer structure composite film is prepared, the layers are firmly combined through covalent bonds, hydrogen-bond interaction and the like, and the interlayer peel strength is remarkably improved; a nano particle filler with a high dielectric constant is introduced into the A-layer structure, so that the dielectric strength of the film is improved, and meanwhile, the film has relatively high anti-breakdown strength; and the layer B effectively improves the mechanical stability of the film material, and has higher mechanical property and material rigidity compared with the traditional PP film.

To provide a multi-layer biaxially oriented film that is resistant to tearing and the like even when stretched at high ratios, and that exhibits excellent heat resistance, particularly heat seal resistance (low shrinkage during heat sealing).SOLUTION: A multi-layer biaxially oriented film comprises an A layer and a B layer, wherein the A layer comprises: a resin composition comprising 75-99 mass% of a polymer satisfying (I) to (II); and 1-25 mass% of a copolymer satisfying (III) to (IV). (I): A content of a constituent unit derived from 4-methyl-1-pentene is 90.0-100 mol%, and a content of a constituent unit derived from a C3-20 α-olefin other than 4-methyl-1-pentene is 0.0 to 10.0 mol%. (II): A melting point is 200-250°C. (III): A content of a constituent unit derived from 4-methyl-1-pentene is 65.0-96.0 mol%, and a content of a constituent unit derived from a C8-20 α-olefin is 4.0 to 35.0 mol%. (IV): A melting point is not observed or is 100 to 199°C.SELECTED DRAWING: None

The present invention provides a polypropylene resin composition, a high-temperature resistant polymer film containing the same, and a preparation method and application thereof. By mass percentage, the polypropylene resin composition includes 79.7-98.9% of polypropylene resin, 1-20% of cycloolefin copolymer, and 0.1-0.3% of radiation crosslinking agent; the glass transition temperature of the cycloolefin copolymer is 120-160 °C; in the present invention, the film including the polypropylene resin composition has a high heat distortion temperature and a low thermal shrinkage rate, good high-temperature resistance, does not affect the dielectric properties of the film capacitor, has a small dielectric loss, can be biaxially stretched at a high draw ratio, and has a low cost.

The invention discloses a method and a device for predicting a preparation process of a biaxially-oriented polytetrafluoroethylene fiber membrane, and relates to the field of process prediction. In the method, a data set of multiple groups of fiber membrane samples prepared through a preset orthogonal experiment is obtained, and the data set comprises a two-way stretching process parameter combination, pore structure data and performance indexes for preparing a target group of fiber membrane samples; constructing an initial machine learning model, taking the two-way stretching process parameter combination in the data set as an input parameter, taking the pore structure data and the performance index as output parameters, training the initial machine learning model to obtain an intermediate model, and adjusting the parameters of the intermediate model through cross validation to obtain a machine learning model; and according to the set target performance, recommending an optimal process parameter combination and a confidence interval through a machine learning model. By implementing the technical scheme provided by the invention, the purpose of efficiently predicting the preparation process of the biaxially oriented polytetrafluoroethylene fiber membrane is achieved.

The present invention discloses a degradable high-barrier composite BOPP matting film. The present invention also discloses a preparation method of the above-mentioned degradable high-barrier composite BOPP matting film. Tannic acid is added to a single-layer magnesium-aluminum hydrotalcite colloid, the system is adjusted to be alkaline, and stirring is continued for 1-3 h. Then it is mixed uniformly with polypropylene and added to an extruder, and melt-extruded at 180-200 °C to obtain a composite polypropylene resin. The composite polypropylene resin, polyhydroxybutyrate, polylactic acid, and cross-linking agent are blended and cast into a base film blank with a thickness of 0.1-1 mm. The matting agent and the slip agent are mixed uniformly, melt-extruded and formed, and then added to the base film blank to obtain a matting blank. The matting blank is biaxially stretched at 80-90 °C, the stretching speed is 40-70 mm / s, the stretching ratio is 4-10, and the stretched blank is irradiated with an electron beam in a nitrogen atmosphere to obtain the degradable high-barrier composite BOPP matting film.