872 results about "BoPET" patented technology

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 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 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 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 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 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.

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 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.

The invention relates to the technical field of PET (polyethylene terephthalate) bottle preparation, and discloses an anti-light-transmission PET bottle preparation method based on a two-way stretching process, raw material pretreatment: compounding a food-grade PETG (polyethylene terephthalate glycol) resin base material, a titanium dioxide or carbon black opacifying agent and auxiliaries containing a dispersing agent and the like, premixing for 5-10 minutes in a high-speed mixer at the speed of 800-1200 rpm, and carrying out vacuum drying for 4 hours at the temperature of 120 DEG C to obtain a premix with the water content of less than or equal to 30 ppm; melting and injection molding: plasticizing the premix through a twin-screw extruder, and carrying out injection molding to obtain a tubular preform with the wall thickness of 2-3mm; and cooling and heating: cooling the preformed blank in a water bath at 25 DEG C, and heating the surface layer to 90-00 DEG C and the core to 60-70 DEG C by using an infrared heating furnace. Stretching and blow molding are conducted, axial stretching is conducted at 50-80 mm / s, radial high-pressure air blow molding is conducted at 2.5-3.5 MPa, the temperature of a mold is 80-100 DEG C, and pressure maintaining is conducted for 5-8 seconds. And post-treatment: cooling in three sections, cutting off excess materials, and carrying out UV treatment to improve weather resistance. By optimizing dispersion of the opacifying agent and selecting a proper opacifying agent, light is effectively blocked, and the light transmittance is controlled at an extremely low level.

The invention relates to the technical field of optical films, and discloses a PET-based composite optical film and a preparation method thereof.The optical film is prepared from 100 parts of PET master batch, 5-10 parts of anti-blue-light nanofiller and 1-3 parts of interfacial compatibilizer through melt extrusion, asynchronous two-way stretching, online anti-fingerprint coating liquid coating and cooling and rolling; the blue-light-resistant nano filler is a core-shell structure filler prepared by taking KH570 silanized nano cerium oxide as a core, polymerizing by grafting glycidyl methacrylate to form a shell layer, and then reacting with 1H-benzotriazole-1-methanol. The anti-fingerprint coating liquid is prepared from perfluoropolyether modified siloxane acrylate and nano silicon dioxide sol. Through core-shell filler design and functional coating online coating, the technical problems that inorganic nanoparticles are easy to agglomerate and organic small molecule auxiliary agents are easy to migrate are synergistically solved, and the obtained optical film has excellent properties of high light transmittance, low haze, efficient blue light resistance and lasting fingerprint resistance and is good in durability.

The invention relates to the technical field of composite films, and particularly discloses a low-temperature heat-sealable high-strength BOPP composite film and a preparation process thereof.The BOPP composite film is prepared by adopting three-layer co-extrusion and two-way stretching processes, and the balance between high strength and low-temperature heat sealability is achieved. The composite film comprises an anti-adhesion surface layer, a core layer and a low-temperature heat-sealing layer; the anti-adhesion surface layer is prepared from the following raw materials: homo-polypropylene, a composite anti-adhesion agent, a slipping agent and PP-g-MAH; the composite anti-adhesion agent is prepared from modified silicon dioxide and modified diatomite in a mass ratio of 3 to 1; the raw materials of the core layer comprise homo-polypropylene, an antistatic agent and a coupling agent, and the raw materials of the low-temperature heat sealing layer comprise an ethylene-vinyl acetate copolymer, PP-g-MAH, a polyolefin elastomer, POE-g-MAH, a modified nucleating agent and an antioxidant, so that the balance of high strength and low-temperature heat sealability is realized, interlayer performance complementation is realized, the mechanical strength is improved, the heat sealing temperature is reduced, and the service life is prolonged. The overall peel strength is improved, and no layering phenomenon exists during stretching.

The invention belongs to the technical field of high polymer materials, and particularly relates to a PET decorative film and a preparation method thereof. The preparation method comprises the following steps: synthesizing hydroxyl-terminated hyperbranched polyester by taking pentaerythritol and 2, 2-dimethylolpropionic acid as raw materials, and reacting with polyol glycidyl ether to prepare an epoxy-terminated organic modifier; silver-loaded nano silicon dioxide subjected to surface treatment by an amino silane coupling agent is used as inorganic functional particles; pET resin, an organic modifier and inorganic functional particles are subjected to melt blending and extrusion granulation, and modified PET is prepared; the modified PET is prepared into the film through a two-way stretching process. Epoxy groups of the organic modifier chemically react with amino groups at the tail end of a PET molecular chain and on the surfaces of inorganic particles respectively, a stable organic-inorganic hybrid network is constructed, synergistic improvement of reinforcement, toughening and long-acting antibiosis is achieved, and the technical problems that functional particles are not uniform in dispersion, interface bonding is weak, and antibacterial components are prone to migration are effectively solved.

The invention relates to a polyester film for an electronic tag and a preparation method thereof.According to the polyester film for the electronic tag, a five-layer co-extrusion structure is adopted, a maze effect is formed through nano clay, the gas diffusion path is prolonged by 10-20 times, the symmetrical core layer design is adopted, stress balance is achieved, the bending rigidity is improved, and the service life of the electronic tag is prolonged. According to the preparation method of the polyester film for the electronic tag, a synchronous two-way stretching technology is adopted, the problem of inconsistent directional shrinkage after two-way stretching is solved, a staged heat setting process is adopted, segmented temperature control is matched with slow cooling, residual internal stress is reduced, the thermal expansion coefficient is reduced by adding the carbon nanotubes, and therefore the overall performance is improved, and the service life is prolonged.

The invention relates to a preparation method of a damp-proof antibacterial medicine packaging composite material with multiple barrier functions, and belongs to the technical field of medicine packaging materials. Enabling the composite complexing nano-silver, polyethylene and zinc stearate to pass through a double-screw extruder to obtain nano-silver antibacterial master batches; adding the nano-silver antibacterial master batch, a mixture of linear polyethylene and an ethylene-vinyl alcohol copolymer, an antioxidant 1010 and silicon dioxide into a single-screw extruder to obtain a damp-proof antibacterial film layer; uniformly coating a polyurethane adhesive on the surface of the damp-proof and antibacterial film layer, compounding an aluminum foil and the film layer coated with the adhesive on a compounding machine, and curing to obtain an aluminum foil-damp-proof and antibacterial film layer; the surface of the aluminum foil-damp-proof antibacterial film layer is coated with a polyurethane adhesive, and then the aluminum foil-damp-proof antibacterial film layer is compounded with a biaxially oriented polypropylene film and cured. The packaging composite material prepared by the invention has excellent moisture resistance, antibacterial ability, barrier property and mechanical property.

The present invention relates to a flexible optical variable thin film with light-induced angle-dependent color change and a preparation method thereof. The base film is selected from one of biaxially oriented polyester film (BOPET), biaxially oriented polypropylene film (BOPP), OPP and nylon (PA) film. By using suitable equipment, processes and materials, an adhesive layer, a reflective layer, a refractive layer and a protective layer are plated and coated based on metals Cr\AL and polymers. It is fully considered that the finished product can still maintain flexibility after the drying and forming of each film layer, and light can propagate between different film layers. As a result of multiple reflections and refractions interacting with each other, an interference phenomenon of "two-color effect" of light occurs, resulting in a light-induced angle-dependent color change effect, and endowing the thin film with different bright lights and colors from multiple perspectives.

The invention relates to the technical field of lithium ion battery composite current collector materials, in particular to a high-strength PP base film and a preparation method thereof. The invention aims to solve the technical problems of poor stability, unbalanced strength and toughness and insufficient surface adhesive force of the PP base film caused by punching processing in current collector preparation of the PP base film. The preparation method comprises the following steps: reacting nano silicon dioxide with maleic anhydride grafted polypropylene to form nano particles with core-shell structures, reacting the nano particles with homo-polypropylene resin to prepare high-content nano reinforced PP master batches, blending the master batches with the homo-polypropylene resin, and carrying out melt extrusion and two-way stretching to obtain a formed PP base film; and carrying out three-layer gradient coating on the formed PP base film, and curing to obtain the high-strength PP base film. The high-strength PP base film disclosed by the invention has excellent mechanical strength and keeps good toughness and adhesive force.

The invention discloses a novel BOPP (biaxially-oriented polypropylene) pearlized film loaded with a composite antibacterial material as well as a preparation method and application of the novel BOPP pearlized film, and the specific scheme is as follows: a KH550 coupling agent is hydrolyzed, a hydrolysate is modified on nano titanium dioxide (TiO2) particles, a natural antibacterial material eugenol (Eug) is brominated by a substitution reaction, and an Eug-TiO2 composite antibacterial material is further prepared based on nucleophilic substitution. And finally, carrying out melting plasticizing, extrusion casting and two-way stretching on polypropylene and pearlescent master batch to prepare the novel BOPP antibacterial pearlescent film, so that the strong activity, high stability, long action time, safety and environmental protection of the antibacterial process of the BOPP pearlescent film are realized, the added value attribute of the BOPP product is improved, and the application scene of the BOPP pearlescent film is expanded.

The invention relates to a biaxially oriented casting polypropylene composite film and a preparation method thereof, and belongs to the technical field of packaging materials. The homo-polypropylene, the co-polypropylene, the slipping agent, the nucleating agent, the antioxidant and the modified nano silicon dioxide are used as raw materials to prepare the biaxially oriented casting polypropylene composite film which can be used in the field of food packaging and has high transparency and good antistatic performance and ultraviolet resistance. The nano silicon dioxide is modified, and the ultraviolet light absorber is grafted on the surface of the nano silicon dioxide, so that the problem that the nano silicon dioxide is easy to agglomerate is solved, and the problem that the ultraviolet light absorber is easy to migrate is also solved; through quaternary ammonium salt structure conjugation, the ultraviolet light absorber has better ultraviolet light absorption performance and antistatic performance.

The present invention provides a waterproof breathable membrane, a preparation method therefor, and a composite fabric comprising same. The preparation method for a waterproof breathable membrane comprises: performing first mixing of a polyolefin raw material and a solvent to obtain a premixed gel; performing second mixing of an elastomer and a solvent, and then performing third mixing with the premixed gel to obtain a mixed gel; performing melt extrusion on the mixed gel to obtain an initial gel membrane, followed by performing initial stretching on a biaxial stretching machine, and then extracting by using an extracting agent to obtain an initial microporous membrane; and performing expanded stretching on the initial microporous membrane, and performing heat setting and rapid high-temperature treatment in sequence. The waterproof breathable membrane is prepared by the described preparation method. The composite fabric is composed of an inner layer fabric, an outer layer fabric, and the waterproof breathable membrane provided by the present invention which is compounded between the inner layer fabric and the outer layer fabric. The preparation method provided by the present invention facilitates industrial promotion and use, and the obtained product possesses excellent waterproof and breathable properties, as well as higher tensile strength and elongation at break.

The invention discloses a bio-based low-VOC (volatile organic compound) water-based ink composition based on microbial fermentation PHA (polyhydroxyalkanoate) as well as a preparation method, application and a printing method thereof, and belongs to the technical field of printing ink and water-based polymer dispersion. The ink adopts a unique protective colloid-free PHA latex system, and is supplemented with precise crosslinking equivalent regulation and control. Compared with the conventional bio-based water-based ink which can be applied to a plastic film only by depending on prime coat or high-energy-consumption drying in the market, the bio-based water-based ink disclosed by the invention can realize excellent adhesion (0-1 level) and wet rubbing resistance on base materials such as BOPP / BOPET and the like without prime coat, and the printing process is greatly simplified. Under the condition that the environment-friendly high standard of low VOC and no PFAS is ensured, the high-speed printing energy consumption is remarkably reduced with lower drying enthalpy, the back sticking pain point is solved, meanwhile, the long working life and the excellent paper-based ink removal property are achieved, and the industrial problem that environment-friendly compliance and high-performance printing are difficult to achieve at the same time is effectively solved.

The invention provides a preparation method of a multi-layer co-extrusion composite insulating material, and relates to the technical field of battery material manufacturing. The preparation method comprises the following steps: respectively melting and mixing an upper layer component, a middle layer component and a lower layer component which are respectively prepared, co-extruding, casting and forming to obtain a multi-layer membrane; performing two-way stretching on the multiple layers of membranes to obtain a composite insulating material; wherein raw materials adopted by the middle layer component comprise isotactic polypropylene and graphene in-situ polymerized polystyrene, raw materials adopted by the upper layer component comprise isotactic polypropylene and norbornene dianhydride, and raw materials adopted by the lower layer component comprise isotactic polypropylene and norbornene dianhydride. According to the obtained composite insulating material, good bonding strength exists between the layers and between the composite insulating material and the metal layer, and the composite insulating material is especially suitable for being used as a base film of a composite current collector.