758 results about "Moisture permeability" patented technology

The invention belongs to the technical field of composite fiber materials, and relates to a functional thermal management fabric, in particular to a phase change microcapsule doped flexible cooling fiber fabric and a preparation method thereof. The fabric has a controllable double-layer structure and is formed by assembling nanofibers and micro-nanofibers doped with a large number of phase change microcapsules. Wherein the micro-nano fiber layer has relatively high sunlight reflectivity and atmospheric window wave band emissivity, and shows an excellent radiation cooling effect; the microcapsule content of the nanofiber layer doped with a large amount of phase change microcapsules is not less than 10 wt%, and the nanofiber layer has no rupture phenomenon, has high heat storage capacity, not only makes up for the deficiency of radiation cooling capacity, but also effectively slows down temperature fluctuation. The radiation cooling technology and the phase change latent heat technology are combined, so that the long-time temperature control performance of the fabric is realized, and the thermal shock resistance is enhanced. In addition, the fabric also has excellent mechanical property, flexibility, washability, air permeability, moisture penetrability and sunscreen property.

The invention discloses an anti-leakage primary and secondary fusion complete ring main unit, and relates to the technical field of ring main units, the anti-leakage primary and secondary fusion complete ring main unit comprises a ring main unit body and further comprises an air pipe, the two ends of the air pipe are communicated with an air inlet and an air outlet formed in the upper end of the ring main unit body respectively, and a plurality of cooling fans are fixed to the side, away from the air pipe, of the air outlet; the looped network box body is divided into a plurality of mounting chambers through a plurality of inner partition plates, and air ports are formed in the sides, close to the mounting chambers, of the air pipes; the interior of the air pipe is divided into a plurality of cavities through a plurality of outer partition plates, and each cavity corresponds to the corresponding installation chamber. The air pipe is sleeved with an airflow path switching assembly, the airflow path switching assembly comprises a sealing plate arranged on the lower surface of the air pipe in a sliding mode, and the sealing plate is provided with a plurality of corresponding holes matched with the air openings; the problems of metal corrosion, circuit board damping, sensor misjudgment and threat to equipment safety caused by internal condensation and water accumulation due to moisture permeation of heat dissipation holes of the ring main unit are solved.

The invention relates to a flexible electrochemical pH sensor as well as a preparation method and application thereof. Wherein the flexible electrochemical pH sensor comprises a flexible nanofiber substrate as well as a working electrode and a reference electrode which are arranged on the surface of the flexible nanofiber substrate at an interval, the working electrode comprises a first working part and a first wire part connected with the first working part, and the first working part is provided with a polyaniline sensitive layer. The flexible electrochemical pH sensor has the characteristics of high sensitivity, good flexibility and good air and moisture permeability, can be tightly attached to the surface of skin to monitor the pH value of body fluid, and is high in monitoring accuracy and simple in manufacturing method.

The invention discloses a food-grade high-temperature-resistant coating and a preparation method thereof. The high-temperature-resistant coating is prepared from 60-75% of matrix resin, 18-28% of surface hydrophobic modified nano functional filler and 10-20% of auxiliaries, and the nano functional filler is prepared from 10-15% of nano silicon dioxide, 5-8% of nano aluminum oxide and 3-5% of nano titanium dioxide. According to the food-grade high-temperature-resistant coating and the preparation method thereof, surface hydrophobic modification is carried out on nano particles through a silane coupling agent, the compatibility and dispersion stability of the nano particles in a resin matrix are remarkably improved, coating defects caused by agglomeration at high temperature are avoided, a hydrophobic barrier is formed by the modified nano filler, the moisture permeability is reduced, and the high-temperature-resistant performance of the food-grade high-temperature-resistant coating is improved. And the damp-heat aging resistance of the coating is enhanced.

Structural insulated wall and roof sheathing systems for use in building construction designed to provide a structural building envelope that is moisture permeable but protects from bulk water, excess air, and thermal transfer.

The invention relates to the field of aramid fabric recycling and reusing, in particular to a method for preparing flame-retardant shielding military tent fabric by recycling waste aramid fabric, which comprises the following steps: step 1, treating the waste aramid fabric with ionic liquid; 2, opening the aramid fabric and recycling aramid fibers; step 3, preparing regenerated flame-retardant prefabricated filaments; step 4, preparing tent base cloth; and step 5, preparing the heat-insulating shielding military tent fabric. Starting from multiple dimensions of aramid fiber recycling and reusing, micro-nano flame-retardant fiber preparation, fabric structure design, functional finishing and the like, more than 98% of flame-retardant viscose and aramid fiber in the aramid fiber blended fabric are recycled and utilized at high value, and the military tent fabric finally developed has the advantages that the flame-retardant viscose and the aramid fiber in the aramid fiber blended fabric are recycled and utilized at high value; the composite material integrates multiple functions of shielding and wave absorbing (the shielding rate is 72dB, the reflectivity is 34.32 dB, and the effective bandwidth is 13.8 GHz), flame retardance, heat insulation, water resistance, oil repellency, air permeability, moisture permeability, weather resistance, softness, durability and the like, and can be used for developing military tents.

A strain gauge includes a flexible substrate; a resistor made from a film containing Cr, CrN, and Cr2N, on one surface of the substrate; and a resin barrier layer covering the resistor, and, in this strain gauge, in the barrier layer, a ratio of a moisture permeability (g / m2 / 24h) to a thickness (mm) is 5:1 or greater, and the thickness of the barrier layer is 100 μm or more and 3 mm or less.

The invention discloses a microporous breathable fabric as well as a preparation method and application thereof, and relates to the technical field of fabric treatment. The invention discloses a preparation method of a microporous breathable fabric, which comprises the following steps: coating the surface of a base cloth with a polyurethane coating agent, and drying to obtain the microporous breathable fabric, the polyurethane coating agent is prepared from the following raw materials in parts by weight: 100 parts of organic silicon modified polyurethane emulsion, 8 to 11 parts of N, N-dimethylacetamide, 2 to 2.5 parts of n-caprylic alcohol, 5 to 8 parts of a foam homogenizing agent and 1 to 3 parts of a thickening agent PTF; the organic silicon modified polyurethane emulsion is obtained by crosslinking polyurethane with carboxymethyl cellulose through silica sol; the polyurethane coating agent prepared by taking the organic silicon modified polyurethane emulsion as the base material is coated on the surface of the base cloth, so that the fabric has high waterproof performance and also has high air permeability and moisture permeability; the microporous breathable fabric prepared by the invention is applied to the field of outdoor sportswear, and comfortable wearing experience is provided.

The invention discloses a bio-based PHA oil-resistant and moisture-permeable coating for hamburger paper, coated paper and a preparation method, and belongs to the technical field of bio-based high polymer materials and paper-based food packaging. The coating is a PHA aqueous dispersion, and mainly comprises a semi-crystalline matrix PHA and a low-crystallinity or amorphous toughening PHA. The core of the coating is that after the coating is dried to form a film, a functional gradient structure can be spontaneously formed in the thickness direction of the coating: an interface layer close to a paper base is rich in toughening PHA so as to enhance toughness and adhesive force; and the surface layer of the coating is rich in matrix PHA so as to maximize the oil resistance. By means of the functional gradient structural design, the packaging material integrates oil resistance, moisture permeability and flexibility of the packaging material, has the degradable environment-friendly characteristic and is suitable for packaging high-grease food.

The invention discloses an anti-ultraviolet waterproof fabric for a casual cap, belongs to the technical field of fabric processing, and is used for solving the technical problem that the waterproof performance and the anti-ultraviolet performance of a fabric for a cap in the prior art need to be further improved. The inorganic cross-linking agent comprises the modified polyurethane layer, the anti-ultraviolet hydrophobic layer and the moisture-permeable lining layer, amino on the surface of the inorganic cross-linking agent serves as a cross-linking group to promote cross-linking of polyurethane chain segments, and the ultraviolet protection effect of the inorganic cross-linking agent and the anti-ultraviolet modified polyurethane and modified liquid cooperate to improve the anti-ultraviolet capacity of the material; the process of electrostatic spinning is promoted, the waterproof performance of the material is remarkably improved through cooperation of the hydrophobic group modified polyurethane and the modification liquid, the adsorption-transfer-desorption process of moisture is formed by the hydrophilic pore channel structure of the lining moisture-permeable layer and the external hierarchical structure, moisture discharge is promoted, and the moisture permeability of the fabric is remarkably improved.

The invention relates to the technical field of preparation of polyurethane gloves, in particular to an innovative preparation method of waterproof and moisture-permeable polyurethane gloves with remarkably improved waterproof, moisture-permeable and mechanical properties, which comprises the steps of lining finishing, drying after dipping in a coagulator, drying after dipping in a polyurethane foaming slurry, drying after dipping in a polyurethane slurry, and drying after dipping in a particle slurry. In the process of drying the hand mold after dipping, the rotation of the hand mold is utilized, and the improvement of the hand mold structure is matched, so that air flow can be generated in the hand mold, and the air flow can be guided to the surface of the hand mold and surrounds the dipping part of the hand mold to form air flow, and moisture generated by drying the surface of the hand mold is guided, so that the moisture on the surface of the hand mold is quickly removed; and the hand mold drying process is accelerated, so that the hand mold is uniformly dried, the problems that the waterproof performance is reduced, the mechanical performance becomes poor and the moisture permeability is changed after the polyurethane glove is formed are solved, and the waterproof and moisture permeability of the polyurethane glove is improved.

The invention discloses a high-barrier composite film for packaging a vacuum insulated panel, which comprises a high-barrier composite film material, and the high-barrier composite film material is composed of a protective layer, a barrier layer, a solvent bonding layer and a heat sealing layer. The preparation method of the high-barrier composite film for packaging the vacuum insulated panel comprises the following steps: S1, compounding the aluminum-plated surfaces of the first polyester aluminum-plated film and the second polyester aluminum-plated film on a film compounding machine by matching with the second adhesive layer. All layers of materials are combined and bonded together through the solvent bonding layers to form the high-barrier composite membrane material, the high-barrier material is firstly compounded and cured in a mode of step-by-step temperature increasing, and then other layers of materials are compounded, so that the formed high-barrier composite membrane material has better oxygen permeability and moisture permeability detection effects than those of an imported material composite membrane material; and the anti-aging effect is extremely close to that of an imported material composite membrane, so that the cost is reduced, the anti-aging effect is ensured, and the oxygen permeation and moisture permeation effects are improved.

The invention discloses a self-softening one-way moisture-conducting environment-friendly fabric and a preparation method thereof, and belongs to the technical field of fabric weaving, the front face of the fabric is made of surface yarn chinlon filaments and polyester yarns, the lining is made of polypropylene spandex core-spun yarns, and the fabric is woven through a single-side knitting machine structure and has the characteristics of self-softening and one-way moisture-conducting. Compared with the prior art, the fabric is soft and comfortable, has good moisture permeability and environmental protection property, and is suitable for the fields of outdoor sports, fitness, daily casual clothes and the like.

The invention provides a double-layer quick-drying moisture-permeable high-emission refrigeration film as well as a preparation method and application thereof. The double-layer quick-drying moisture-permeable high-emission refrigeration film comprises a hydrophilic layer and a hydrophobic layer, wherein the hydrophilic layer comprises titanium carbide and polyurethane, the hydrophobic layer comprises polyvinylidene fluoride and an adhesive, and the double-layer quick-drying moisture-permeable high-emission refrigeration film further comprises an alkaline substance. The double-layer quick-drying moisture-permeable high-emission refrigeration film has the characteristics of better refrigeration performance, higher moisture permeability and better wearable performance, including but not limited to high moisture permeability and high air permeability.

The invention belongs to the field of high polymer materials, and discloses a double-trigger programmable degradable PHA composition and a preparation method thereof. A cured film structure formed by the composition sequentially comprises an outer protective layer, a trigger layer and an inner functional layer from outside to inside, wherein the outer protective layer takes polyhydroxyalkanoate as a base material, a reversible cross-linked network is introduced into the outer protective layer, the trigger layer is provided with humidity and ion double-trigger microcapsules, and the inner functional layer is used for bearing functional auxiliaries. The cured film can maintain low permeability and mechanical stability before application. After application, under the synergistic effect of specific moisture and ions, the trigger layer is activated, so that the cured film is subjected to step-type improvement of moisture permeability in a preset time window, and a through hole is formed. And finally, integral disintegration is realized through physical structure failure. The technology can be applied to the fields of seed coating and the like, the activity of a biological base material can be ensured by adopting a low-temperature process with the temperature lower than 50 DEG C, and unification of stable protection before application and on-demand disintegration after application is achieved.

The invention relates to a recyclable TPEE film and a preparation method thereof. The recyclable TPEE film is prepared from the following raw materials in parts by weight: 100 parts of TPEE resin master batch, 0.5 to 2.0 parts of cross-linking agent, 1.5 to 2.5 parts of antioxidant, 0.5 to 1.0 part of tackifier and 15 to 18 parts of diatomite loaded nano titanium dioxide. The recyclable TPEE film provided by the invention has relatively high moisture permeability and tensile strength retention rate, and can be recycled.

The invention belongs to the field of nanofiber composite fabric preparation, and provides a nanofiber high-moisture-permeability waterproof fabric with multi-stage communicated pore canals and a preparation method thereof.The fabric body comprises an outer layer, a middle layer and an inner layer, the outer layer is a pure polyester waterproof fabric subjected to waterproof finishing, the middle layer is a nanofiber membrane with the multi-stage communicated pore canals, and the inner layer is a nano-fiber membrane with the multi-stage communicated pore canals; the inner layer is a pure polyester fabric; the inner side of the outer-layer pure polyester waterproof fabric is attached to the hydrophobic polyvinyl alcohol nanofiber membrane of the nanofiber membrane with the multi-stage communicated pore channels in the middle layer through hot melt adhesive compounding, and the inner-layer pure polyester fabric is attached to the hydrophilic polyurethane nanofiber membrane of the nanofiber membrane with the multi-stage communicated pore channels in the middle layer through hot melt adhesive compounding. The middle layer of the nanofiber membrane is formed by sequentially overlapping multiple stages of nanofiber membrane layers, each stage of nanofiber membrane layer is provided with two layers of nanofiber membranes with different fiber diameters, one layer is a hydrophilic polyurethane nanofiber membrane, and the other layer is a hydrophobic polyvinyl alcohol nanofiber membrane; nanofibers of two membranes among the multistage nanofiber membrane layers and in the membrane layers are in cross lap joint to form a three-dimensional structure with multistage communicated pore channels, and the pore diameter is gradually reduced from the hydrophilic polyurethane nanofiber membrane to the hydrophobic polyvinyl alcohol nanofiber membrane. The moisture permeability is higher than 15000g / (m < 2 >. 24h), and the hydrostatic pressure is higher than 60kPa.

The invention discloses a high-water-pressure moisture-permeable physiologically comfortable fabric and a preparation method thereof, and relates to the technical field of layered products, in particular to a layered product composed of polyesters, the preparation method comprises the following steps: after triangular polyester fibers are made into a fabric, the fabric is sequentially subjected to hot-pressing compounding with a PU film and a pretreated raised line fabric, and the fabric is prepared into the high-water-pressure moisture-permeable physiologically comfortable fabric. By means of the special-shaped structures of the fabric made of the triangular polyester fibers and the raised line fabric, the occlusal force of the fabric and the PU film is improved, heat loss is reduced, the water pressure resistance and moisture permeability of the fabric can be guaranteed, meanwhile, the combination effect of the fabric and the PU film is promoted, and the heat preservation performance of the fabric is enhanced; the defect that in the prior art, a synthetic fiber fabric and a PU film in a water-pressure-resistant moisture-permeable fabric are poor in binding property and heat retention property is overcome. The convex strip part can be more tightly attached to the film, and the groove part can play a role in buffering and accommodating, so that the compounded fabric is more tightly attached and is not easy to separate.

The invention relates to the related technical field of composite fiber fabrics, in particular to a composite phase-change fiber fabric which comprises five layers of structures stacked in sequence, a surface layer is warp and weft twisted surface cloth formed by compounding plant source cellulose aerogel, organic phase-change microcapsules, a superfine denier polyester matrix and a carbon-based conductive material, and a surface layer is warp and weft twisted surface cloth formed by compounding plant source cellulose aerogel, organic phase-change microcapsules, a superfine denier polyester matrix and a carbon-based conductive material; through chemical bonding, gradient distribution and bionic structure design, the technical bottlenecks that the heat storage performance of a traditional phase change material is easy to attenuate, moisture permeability and heat preservation are difficult to consider, and a functional layer is easy to peel are systematically solved; the multi-level synergistic effect provides an innovative solution with high stability, wearing comfort and environmental adaptability for the intelligent thermoregulation clothes, and the fabric is obviously superior to the existing single-function or simple composite fabric.

The invention discloses a waterproof and moisture-permeable composite film and a preparation method thereof, a waterproof and moisture-permeable fabric and clothes. The waterproof moisture-permeable composite film comprises a microporous film, a ceramic layer and a waterproof layer, wherein the ceramic layer is arranged on the surface of one side or two sides of the microporous film in a laminated manner; the waterproof layer is arranged on the surface of the ceramic layer in a laminated manner; the ceramic layer comprises ceramic particles, the waterproof layer comprises a cross-linked substance of a waterproof finishing agent, or the waterproof moisture-permeable composite film comprises a microporous film and a composite layer laminated on the surface of one side or two sides of the microporous film, and the composite layer comprises ceramic particles and a cross-linked substance of a waterproof finishing agent. The waterproof and moisture-permeable composite film can be used for preparing a waterproof and moisture-permeable fabric. The waterproof and moisture-permeable composite film disclosed by the invention has excellent waterproof performance and washing resistance while keeping good air and moisture permeability.

The invention relates to a flash evaporation material with high transparent strength and a preparation method thereof, the flash evaporation material comprises the following raw materials: polyethylene with high transparent strength of 0.2-3 kN / m; the high-permeability strength is equal to the moisture permeability index * the longitudinal tensile strength; the test standard of the tensile strength is a constant-speed tensile method for testing the tensile strength of paper and paperboards according to GBT 12914-2018; the test standard of the moisture permeability index is GB / T 11048-2018 determination of thermal resistance and moisture resistance (evaporation hot plate method) under the physiological comfort steady state condition of the textile. The flash evaporation material disclosed by the invention has relatively good high-transmittance strength.

The invention discloses an ethylene-propylene-diene monomer rubber working at a high temperature of 180 DEG C. The ethylene-propylene-diene monomer rubber has the characteristics of excellent insulativity, high and low temperature resistance, acid and alkali resistance, weather resistance, high elasticity and flexibility, has more excellent thermal stability and ultraviolet resistance, and has lower wet permeability than natural rubber, butyronitrile rubber and silica gel; the invention also provides a preparation process aiming at the formula, the process is adopted for control, and a two-stage method is adopted for rubber mixing, so that the advantages of each component in the formula are further exerted, and the temperature resistance, the sealing property and the strength of the ethylene propylene diene monomer are improved; the ethylene propylene diene monomer provided by the invention can be widely applied to static sealing products and can be used within the range of 180 DEG C or below, the technical problem that fluororubber with higher cost has to be adopted when the temperature exceeds 165 DEG C is solved, and the ethylene propylene diene monomer has a wide application prospect. The invention belongs to the technical field of rubber processing.

The utility model provides refrigeration equipment. The refrigeration equipment comprises a shell; a drawer; a moisture permeable structure; a refrigeration air supply outlet is formed in the refrigeration chamber, an air return inlet is formed in the fresh-keeping chamber, a first distance is formed between the moisture permeable structure and the inner wall of the fresh-keeping chamber, and the refrigeration air supply outlet is communicated with the air return inlet through the first distance. According to the refrigeration equipment provided by the utility model, the first interval is formed between the moisture-permeable structure and the fresh-keeping chamber, so that air flow entering the refrigeration chamber can only flow to the air return port through the first interval, and the air flow is utilized to take away water accumulated on the moisture-permeable structure and damage humidity accumulation on the surface of the moisture-permeable structure; a dynamic and stable internal and external humidity difference environment is established, the moisture permeable effect of the moisture permeable structure is kept, then the fresh-keeping effect of the refrigeration equipment is guaranteed, and the use experience of a user is improved.

The invention relates to the technical field of flame-retardant fireproof materials, in particular to a hydrophobic and moisture-permeable flame-retardant fireproof material as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing phenol and formaldehyde, adding a catalyst, carrying out a reaction at 80-85 DEG C for 3-4 h, adjusting the pH value to strong acidity, then adding a modifier, carrying out mixing, carrying out a reaction at 80-100 DEG C for 2-6 h, adjusting the pH value to 5-6, and carrying out washing and drying so as to obtain modified phenolic resin; and S2, drying the modified phenolic resin, and carrying out melt blowing, curing, washing and drying to obtain the flame-retardant fireproof material. The prepared non-woven material has excellent flame-retardant and fireproof performance, the hydrophobic and moisture-permeable performance is further improved, the non-woven material is comfortable and durable, the applicability in an extreme environment is excellent, and the application requirement of firefighter uniform or heat insulation clothes can be met.

The invention discloses a high-comfort-degree pillowcase blended fabric, and particularly relates to the field of articles for daily use, the high-comfort-degree pillowcase blended fabric comprises an outer fabric layer, a middle spacing layer and an inner fabric layer, and the outer fabric layer and the inner fabric layer are connected through the middle spacing layer; and the outer fabric layer, the middle spacing layer and the inner fabric layer jointly form a three-dimensional spacer fabric with a multi-layer structure. According to the invention, through the multi-layer structure design, a three-dimensional pore structure is formed, air flow and heat dissipation are promoted, the moisture-permeable and air-permeable performance is excellent, and comfort and hygiene in the use process are ensured; the outer layer, making contact with the skin, of the cloth is made of cool fibers, the middle spacing layer achieves dynamic supporting and long-term shape stability through the composite design of a rigid framework and elastic driving, and the use comfort is remarkably improved; by means of the moisture and air permeability design of the pillowcase, the use experience is further improved, stuffiness and discomfort are avoided, and the air permeability, the moisture permeability, the cool feeling and the supporting performance are comprehensively improved in combination with the synergistic effect of specific fiber materials.

The invention provides an automatic humidity adjusting type functional fiber membrane based on intelligent temperature sensing and a preparation method of the automatic humidity adjusting type functional fiber membrane. According to the method, a novel instantaneous free radical integrated polymerization gel composite fiber layer is constructed on the surface of an intelligent temperature-sensing fiber membrane subjected to padding finishing, and the instantaneous free radical integrated polymerization gel composite fiber layer and the intelligent temperature-sensing fiber membrane are organically combined to form a double-intelligent response system functional fiber membrane finished product, so that the intelligent response characteristics of washing resistance, wear resistance, low-temperature moisture absorption and high-temperature one-way moisture conduction are generally realized; therefore, the raw material fiber becomes the functional intelligent fiber fabric which has multiple protection functions of excellent moisture permeability, air permeability, wear resistance and the like, and can realize washability and ultralight design.

The invention provides a degradable breathable composite film based on a gradient microporous structure and a preparation method and application thereof, and belongs to the field of protective materials.The preparation method comprises the steps that PLA, PBAT, ADR, CaCO3 and modified master batches are subjected to melt blending in proportion, a three-layer casting film is prepared through three-layer casting film forming equipment, the three-layer casting film is formed through a stretching technology, and a gradient breathable film is obtained; a PLA non-woven fabric is prepared through a melt-blowing or spun-bonding technology; and compounding the gradient breathable film with a PLA non-woven fabric to obtain the degradable breathable composite film based on the gradient microporous structure. The three-layer casting co-extrusion process is adopted, the gradient porosity breathable film and the hydrophilic / hydrophobic design are combined, the comprehensive performance of the protective material is effectively improved, the moisture permeation amount of the material is increased, the hydrostatic pressure of the material is improved, and therefore the barrier property and comfort of the material are enhanced. The blocking layer is made of a porous membrane material formed by stretching PLA and PBAT composite CaCO3, the comfortable layer is made of a PLA spunbond / melt-blown non-woven fabric material, and full degradation of the protective material is achieved.

The application discloses a kind of high waterproof moisture-permeable polyurethane film materials and high waterproof moisture-permeable fabric, it is related to polyurethane film material technical field, high waterproof moisture-permeable polyurethane film material, including following raw materials: polyether diol, diisocyanate, organic solvent, modified porous biochar, modified diatomite, chain extender, thickening agent, defoaming agent, ultraviolet absorber, dibutyltin dilaurate;The modified porous biochar is prepared by activating corn straw powder by potassium phosphate and potassium hydroxide in cooperation, and polyethylene glycol is added as a dispersant, and the modified porous biochar is treated by mercapto and fluorination modification;By introducing potassium phosphate in cooperation with potassium hydroxide to form an activation system in the preparation of modified porous biochar in polyurethane film material, combined with polyethylene glycol, dispersion optimization and reduction synergy are realized, and the moisture permeability, waterproofness, mechanical properties and durability of the material are improved.

The invention discloses a radiation cooling fabric with a long-time phase change heat storage function. The radiation cooling fabric comprises a porous flexible phase change film on the inner layer and a nanofiber film on the outer layer. The porous flexible phase change film comprises a phase change microcapsule, the thickness of the porous flexible phase change film is 1000-1500 [mu] m, and the particle size of the phase change microcapsule is 1-10 [mu] m; the nanofiber membrane comprises nanofibers, the length of the nanofibers is larger than 1000 microns, and the diameter of the nanofibers is 10-1000 nm. And the thickness of the nanofiber membrane is 150 to 500 [mu] m. The prepared flexible film fabric has excellent air permeability, moisture penetrability, cycling stability, thermal stability and washability, and the thermal comfort of a human body in a high-temperature environment is enhanced through the combination of radiation cooling and latent heat storage technologies.

The invention relates to the technical field of polymer functional material processing, and particularly discloses a polyethylene waterproof breathable film using PTFE micro powder as an opening agent and a preparation method of the polyethylene waterproof breathable film. The waterproof breathable film is prepared from the following components in parts by weight: 50-70 parts of linear low-density polyethylene, 10-40 parts of PTFE (Polytetrafluoroethylene) micro powder, 3-8 parts of a modified compatilizer and an auxiliary agent. The preparation method comprises the following steps: S1, activating PTFE micro-powder by a silane coupling agent and coating the PTFE micro-powder with polyethylene wax to obtain modified micro-powder; s2, uniformly mixing all the components; s3, carrying out melt extrusion at 180-210 DEG C through a double-screw extruder, and carrying out tape casting to form a cast sheet; s4, the casting piece is heated to 90-115 DEG C for two-way stretching, and micropores are formed through interface stripping between the PTFE particles and the base body; and S5, carrying out heat setting at 120-130 DEG C, cooling, and rolling to form the film. Through the synergistic effect of the self-made compatilizer and the pretreatment process, the interface anchoring force is enhanced, the problems of powder falling and water leakage of highly-filled PTFE are solved, and meanwhile, high moisture permeability, high hydrostatic pressure resistance and high mechanical property are taken into account.