86 results about "Polypropylene fiber" patented technology

The present application belongs to the technical field of high-performance polypropylene fiber, and particularly relates to a preparation method of water mark-free high-performance polypropylene fiber. The preparation method of the water mark-free high-performance polypropylene fiber comprises the following steps: S1, adding polypropylene chips, fillers, compatilizers, antioxidants and nucleating agents into a high-speed mixer to obtain premix by high-speed mixing; S2, melt spinning the premix obtained in step S1 to obtain the water mark-free high-performance polypropylene fiber. The polypropylene chips are used as the main material, and the interaction of the specific inorganic fillers and the compatilizers can significantly improve the tensile property of the fiber, effectively reduce the water drop diffusion time and accelerate the drying rate.

The application belongs to the technical field of geological compositions, and particularly relates to a fly ash-based high-density geological composition, a preparation method thereof and application thereof in road engineering. The fly ash-based high-density geological composition comprises the following components in mass fractions: fly ash 50-60 parts; slag 20-30 parts; metakaolin 7-12 parts; modified nano Al2O3 2-4 parts; modified polypropylene fiber 1.0-2.0 parts; silica ash 3-8 parts; alkali activator 30-40 parts; and water 15-20 parts. The application provides a fly ash-based geological composition which has normal-temperature bending strength, compressive strength and excellent freeze-thaw resistance.

The application provides a method for preparing steel-polypropylene hybrid fiber light-weight concrete, which comprises the following steps: (1) controlling water in the aggregate to obtain pretreated aggregate, wherein the aggregate is selected from a mixture of volcanic slag and ceramsite or the volcanic slag, the water content of the pretreated volcanic slag is less than or equal to 3%, and the water content of the pretreated ceramsite is 8%-10%; (2) the concrete formula further comprises cementitious material, the cementitious material is composed of cement, fly ash and silica fume, the pretreated aggregate, the fly ash, the silica fume and 90wt% of the cement are mixed and stirred to obtain a first mixture; (3) polypropylene fibers are mixed with the remaining cement in the cementitious material and then stirred to obtain pre-dispersed polypropylene fibers; (4) the first mixture, the pre-dispersed polypropylene fibers and dispersed steel fibers are mixed and stirred to obtain a second mixture; and (5) the second mixture, water and a water reducing agent are uniformly mixed and stirred until the mixture presents a uniform viscous state. The application realizes the synchronous improvement of the mechanical properties and the production stability of the light-weight concrete.

This invention discloses a floor repair agent and its preparation method, belonging to the field of building materials technology. The repair agent comprises a modified resin component, a curing agent component, a modified composite functional filler, and composite additives. The modified resin is a composite system of silane coupling agent-modified epoxy resin and terminally hydroxylated polyurethane. The modified composite filler consists of modified nano-silica, passivated quartz sand, and hydroxylated recycled polyurethane rigid foam powder. The composite additives include a compound toughening agent and composite modified polypropylene fibers. During preparation, each component undergoes targeted modification pretreatment, followed by temperature-controlled stirring and step-by-step mixing to obtain the finished product. This invention solves the problems of poor resin compatibility, weak filler bonding force, and easy cracking and debonding in existing repair agents. The product has high bonding strength, low shrinkage, wear resistance, and impact resistance. It can be used stably in environments ranging from -30℃ to 80℃, is environmentally friendly and odorless, and is easy to apply. It combines performance and cost advantages, and is suitable for long-term repair of various floor types and heavy-duty, high- and low-temperature conditions.

The utility model provides a kind of assembled concrete composite floor structure, it is related to concrete composite floor technical field, including: prefabricated slab and concrete cast-in-place layer, the prefabricated slab upper end is poured with concrete cast-in-place layer, the prefabricated slab left and right side end is symmetrically provided with first component and second component, the first component and second component side end face are provided with filling cavity, the filling cavity is injected with anti-seepage filler layer, the first component and second component are fixed with the side end face of prefabricated slab by anti-seepage filler layer and are bonded, the first component and second component side end are correspondingly spliced by arc splicing surface each other, the prefabricated slab upper surface is combined with concrete cast-in-place layer by polypropylene fiber web.The utility model solves the problem that the concrete layer poured on the existing prefabricated slab is easy to seep from joint and affect the construction quality of composite floor.

The application discloses a kind of radiant heating and cooling with heat equalizing coating and preparation method thereof, belong to the field of coating technology.The application uses water-based epoxy resin emulsion, water-based epoxy resin curing agent, high thermal conductivity graphite, alpha-aluminum oxide, copper fiber, steel fiber and polypropylene fiber as main raw materials, water-based epoxy resin emulsion and curing agent are reacted to form thermosetting resin matrix with high bonding strength and weather resistance, provide stable support structure for coating;High thermal conductivity graphite and alpha-aluminum oxide as main heat conduction framework, ensure the efficient diffusion of heat in the plane direction;Copper fiber and steel fiber are overlapped in the coating, which significantly improves the heat diffusion efficiency in the plane and thickness direction, avoids local heat accumulation;Polypropylene fiber limits microcrack propagation through bridging effect, enhances the toughness and crack resistance of the coating, ensures the long-term stability of the contact interface of the heat-conducting filler, and finally makes the coating have excellent heat equalizing ability, mechanical strength and corrosion resistance.

This invention relates to the field of polymer material modification technology, specifically to a siloxane-based hydrophilic crosslinking agent for polypropylene fibers and its modification method. The crosslinking agent uses water as the dispersion medium and mainly comprises the following components by mass percentage: 1%–10% silane coupling agent, 10%–30% acrylic resin, 0.1%–1% catalyst, and the balance being water. The silane coupling agent is preferably an amino- or epoxy-containing silane coupling agent, and the acrylic resin is preferably a hydrophilic modified acrylic resin emulsion with a glass transition temperature of -10°C to 25°C. This invention also provides a method for hydrophilic modification of polypropylene fibers using this crosslinking agent, including diluting the crosslinking agent into a working solution, followed by impregnation, rolling, pre-drying, and baking treatments. This invention, through the synergistic effect of the silane coupling agent and acrylic resin, forms a strong crosslinking network on the fiber surface, endowing polypropylene fibers with durable and effective hydrophilic properties. The process is simple, environmentally friendly, and suitable for textiles, sanitary materials, and other fields.

Provided are a polypropylene resin composition, which has a melt index, a melting point, and a crystallization temperature all optimized along with a narrow molecular weight distribution by using a polypropylene resin, which is prepared in the presence of a metallocene compound having a specific structure, and a molecular weight modifier in a predetermined range, thereby being suitable for ultra-low basis weight, high-stiffness nonwoven fabrics, and a polypropylene fiber manufactured therefrom.

The application discloses a kind of low modulus high ductility super-retarding concrete, the concrete includes by weight ratio: cement 254~360 parts, fly ash 68~108 parts, slag powder 68~70 parts, 5~16mm gravel 352~393 parts, 16~25mm gravel 660~729 parts, medium sand 669~705 parts, rubber powder 20 parts, polystyrene plastic 15 parts, water 150 parts, water reducing agent 5.9~7.5 parts, super-retarding agent 3.1~4.0 parts, water-based polyurethane 15 parts, nano composite hydrogel 15 parts, polyolefin elastomer 5 parts, polypropylene fiber 1.0 part, can have higher toughness, lower elastic modulus, and can reach design requirement strength and durability, simultaneously, when practical application, first, a layer of low modulus high ductility super-retarding concrete is poured, then continue to pour ordinary concrete, combined with other anti-cracking measures, can effectively reduce the constraint degree of bottom plate to upper portion, prevent temperature cracks.

This application relates to the field of building materials technology, and discloses a dry-mixed quick-setting mortar for road repair and its preparation process. The mortar is made from a ternary cementitious system composed of sulfoaluminate cement, rapid-hardening silicate cement, and high-belite sulfoaluminate cement, combined with temperature-sensitive microporous mineral composite functional particles, graded fine sand, active admixtures, nano-calcium carbonate, quick-setting agent, and polypropylene fiber. The preparation process employs a two-step mixing process of low-speed premixing and secondary high-speed shear mixing. This invention utilizes the stepped hydration exothermic mechanism of the ternary cementitious system combined with the targeted slow-release mechanism of the temperature-sensitive particles to achieve adaptive control of setting time across the entire temperature range, overcoming the defect of uncontrolled hydration rate under extreme temperature differences. The resulting mortar possesses high early-stage strength and non-regressive later-stage strength, while exhibiting low drying shrinkage and high bonding strength between new and old interfaces, meeting the requirements for rapid all-weather road repair and long-term service.

The invention relates to the technical field of building materials, and provides self-repairable single-component polymer waterproof mortar as well as a preparation method and application thereof. The self-repairing type single-component polymer waterproof mortar is prepared from the following raw materials in parts by weight: 40 to 50 parts of Portland cement, 45 to 55 parts of quartz sand, 1 to 3 parts of redispersible latex powder, 0.5 to 1.5 parts of dispersible asphalt rubber powder, 0.1 to 0.3 part of silane modified polypropylene fiber, 0.1 to 0.3 part of a water reducing agent, 0.1 to 0.3 part of a de-foaming agent, 2 to 5 parts of slow-release type crystalline active particles, 0.1 to 0.3 part of an early strength agent and 1 to 3 parts of an expanding agent. According to the technical scheme, the problems of insufficient impermeability, mechanical strength and adhesive property caused by no self-repairing capability of the waterproof mortar in the prior art are solved.

This invention relates to a high-efficiency outdoor flame retardant additive, its preparation method, and its application, belonging to the field of polymer material additives technology. This high-efficiency flame retardant additive has N,N'-di(3-aminopropyl)-1,2-ethylenediamine as its main chain, linked with dialkoxy-monochlorotriazine, containing six N-cyclohexyloxy hindered amine groups, with a purity ≥99.5% and a total yield ≥80%. It is prepared from 2,2,6,6-tetramethylpiperidone nitroxide radical, cyclohexane, etc., via N-cyclohexyloxylation, reductive amination, N-acylation, and nucleophilic substitution reactions. Adding 0.5~3.0 wt% of this stabilizer to polypropylene materials can impart UL-94 VTM-0 flame retardancy and excellent photothermal stability. Furthermore, the preparation process is low-cost and environmentally friendly, solving the technical problems of easy deactivation of hindered amines, functional separation of additives, and low yield in traditional synthesis processes. It is suitable for polypropylene fibers, films, nonwoven fabrics, and other polyolefin products.

This application discloses a high-performance automotive polypropylene fiber-reinforced composite material and its preparation method, belonging to the field of polymer material modification technology. By weight, the polypropylene fiber-reinforced composite material comprises the following components: 60-80 parts of low-volatile polypropylene matrix resin; 15-30 parts of graded hybrid reinforcing fibers; 2-5 parts of composite adsorbent; 0.5-2 parts of aminosilane coupling agent; and 0.2-0.5 parts of antioxidant.

This invention relates to a prefabricated building wall panel and its manufacturing method, belonging to the technical field of prefabricated building new wall material manufacturing. The panel body is manufactured through mixing, pouring, and curing. The raw materials, by weight, include: 360-400 parts cement, 70-90 parts fly ash, 110-130 parts modified lightweight aggregate, 530-570 parts manufactured sand, 1.0-1.5 parts polypropylene fiber, 3.5-4.5 parts polycarboxylate superplasticizer, and 150-170 parts water. The aggregate surface is coated with an interface layer formed by crosslinking of amphiphilic hyperbranched polysiloxanes containing C12-C18 long-chain alkyl groups, alkoxysilanes, and flexible amino segments containing hydroxyl groups. Through the reaction of alkoxysilanes with cement hydration products, a Si-O-Si-Ca covalent bond network is constructed internally for connection. This invention effectively solves the technical problem of low strength and easy cracking in the interface transition zone, significantly improving the compressive strength and structural integrity of the wall panel.

The application provides a polypropylene dissolving agent and application thereof, and belongs to the technical field of olefin dissolving agents.The polypropylene dissolving agent comprises the following raw materials in mass fractions: dicyanamide salt ionic liquid 10-25 parts, betaine salt 5-15 parts, tetrafluoroborate salt ionic liquid 5-15 parts, ethyl sulfate salt ionic liquid 5-15 parts, acetate salt ionic liquid 10-20 parts, long carbon chain anion ionic liquid 10-40 parts, dispersant 2-18 parts and auxiliary agent 2-20 parts.Under the condition of 180-280 DEG C, the mass fraction of the polypropylene dissolving agent of the application to polypropylene with a molecular weight of 500-1000 million can reach more than 15%, and the wet processing of the ultra-high molecular weight polypropylene into a film can be realized, and the polypropylene diaphragm or polypropylene fiber obtained by processing has the characteristics of high temperature resistance, high strength (including tensile and puncture strength), high porosity, high air permeability and the like.

The application provides an antibacterial and mildew-proof automobile sound-absorbing cotton made of high-performance polypropylene fibers and polyethylene terephthalate fibers and a preparation method thereof, comprising the sound-absorbing cotton, which comprises a three-dimensional reticular continuous porous matrix formed by heat bonding of polypropylene fibers and polyethylene terephthalate fibers, and an antibacterial and mildew-proof component is uniformly dispersed in the three-dimensional reticular continuous porous matrix. The application has reasonable design, adopts a double antibacterial structure of "fiber internal blending loading + surface coating strengthening", and is combined with a broad-spectrum antibacterial agent combination such as silver ion loaded zeolite, the antibacterial component is uniformly dispersed and the addition amount is low. Through testing, the sound-absorbing cotton has no mold growth and no mildew smell after being placed in a closed high-humidity environment at room temperature and 40 DEG C for 20 days, completely solves the mildew smell problem of the interior in a humid area, and effectively guarantees the air quality in the vehicle.

The application discloses a production method of high-performance recyclable BOPP film, and the high-performance recyclable BOPP film comprises an outer layer, a middle layer and an inner layer; the outer layer is composed of homopolymer polypropylene, polylactic acid, polyhydroxybutyrate, polypropylene carbonate, polystyrene-acrylonitrile copolymer, an antioxidant, an ultraviolet absorber and a slip agent; the middle layer is composed of homopolymer polypropylene, thermoplastic starch, polycaprolactone, polyethylene terephthalate, maleic anhydride grafted polypropylene, a fiber reinforcing agent and methyl methacrylate-butadiene-styrene copolymer; and the inner layer is composed of random copolymer polypropylene, polybutylene succinate, polyvinyl alcohol, PA6, an antistatic agent and an antibacterial agent. The BOPP film prepared by the method has good performance, is environment-friendly and recyclable.

This application discloses an inorganic-organic composite fiber layer, its preparation method, and its application. The inorganic-organic composite fiber layer comprises, by mass percentage, 40%-70% inorganic skeleton fibers, 20%-50% organic toughening fibers, and 1%-10% an interface anchoring system. The inorganic skeleton fibers are one or more of glass fibers, alumina fibers, or ceramic fibers. The organic toughening fibers are one or more of polyethylene fibers, polypropylene fibers, polystyrene fibers, polyacrylonitrile fibers, polyimide fibers, polyethylene terephthalate fibers, epoxy resin fibers, or phenolic resin fibers. The interface anchoring system includes a coupling agent and a pH adjuster, and is used to anchor the inorganic fiber skeleton and the organic toughening fibers to the surface of a substrate material.

This invention discloses a highly moisture-wicking clothing fabric and its preparation method in the field of fabric technology. The clothing fabric is a double-layer fabric. The upper layer is made of a blended yarn of polypropylene fiber and bamboo fiber, and the lower layer is made of mica cooling fiber. The mica cooling fiber is prepared by using mica powder, polystyrene, lignin, organic solvent, and dispersant as raw materials to prepare a functional dispersion. The functional dispersion is then blended and melted with a spinning melt to obtain a spinning solution, which is then electrospun to obtain the final product. The clothing fabric of this invention has high moisture-wicking properties and excellent cooling effect upon contact. Furthermore, the fabric preparation process differs from existing cooling and moisture-wicking finishing agents, resulting in a more lasting cooling and moisture-wicking effect.

This invention belongs to the field of concrete building materials technology, and discloses a fiber-reinforced concrete segment suitable for dual control of micro-cracks and macro-cracks, and its preparation method. The fiber-reinforced concrete segment comprises cement-based concrete and crack-resistant fibers and structural fibers compositely added to the cement-based concrete. The crack-resistant fibers are fine steel fibers with a diameter of 0.15-0.25 mm and a length of 10-15 mm; the structural fibers are coarse polypropylene fibers with a diameter of 0.8-1.2 mm and a length of 40-60 mm; the volume fraction of the crack-resistant fibers is 0.5%-0.8%; and the volume fraction of the structural fibers is 0.5%-0.9%. The fiber-reinforced concrete segment provided by this invention can achieve continuous crack control, synergistic effect, and better economic efficiency.

This invention relates to the field of LWRT composite panel preparation technology, and particularly to a method for preparing LWRT composite panels, LWRT composite panels, and their applications. Glass fibers and polypropylene fibers are sequentially opened, dry-carded, cross-laid, and needle-punched to obtain a composite felt. The obtained composite felt is then passed through a first heating zone, while the nonwoven fabric and hot melt adhesive layer simultaneously follow the composite felt from its upper and lower surfaces through a second heating zone. After further hot lamination and cold setting, the LWRT composite panel is obtained. This invention significantly improves the bending performance, interlayer cohesion, and thickness uniformity of the composite panel by controlling the selection and specific gravity of the nonwoven fabric, hot melt adhesive layer, resin fibers, and glass fibers, and by combining material mixing, needle-punching, hot lamination, and cold setting processes. This overcomes many challenges of existing LWRT panels in the interlayer of RVs, buses, and vans.

A prefabricated lightweight aggregate fiber concrete sandwich insulated composite wall with a frame structure is disclosed. The composite wall consists of prefabricated lightweight aggregate fiber concrete sandwich insulated composite wall panels connected to the frame structure to form an integral whole. The top and bottom ends of the prefabricated lightweight sandwich insulated composite wall are connected to the crossbeams via sliding energy-dissipating nodes. Limiting devices are provided between the left and right sides of the prefabricated lightweight sandwich insulated composite wall and the frame columns, and filling material is also adhered between the left and right sides of the prefabricated lightweight sandwich insulated composite wall and the frame columns. The lightweight aggregate fiber concrete uses fine ceramsite as coarse aggregate to reduce the weight of the wall and decrease seismic forces. The addition of polypropylene fibers to the formula improves the ductility and crack resistance of the concrete. This invention features fire resistance, thermal insulation, earthquake resistance, and convenient connection, effectively improving the seismic performance and thermal insulation performance of buildings in high seismic intensity and cold regions, while reducing construction difficulty.

The present application relates to the technical field of composite cloth, in particular to a breathable cool sandwich composite cloth and a production method thereof; the composite cloth is composed of a surface layer, an intermediate layer and an inner layer; the surface layer is made of polypropylene fiber; the intermediate layer is made of modified polyurethane fiber; and the inner layer is made of polyester fiber and flax fiber mixed in a mass ratio of 7-8:2-3. The inner layer of the composite cloth is made of polyester fiber and flax fiber, which has good moisture absorption and can provide cool feeling and wearing comfort; the intermediate layer is made of modified polyurethane fiber, which improves the heat conduction performance and makes the heat dissipate quickly; and the surface layer is made of polypropylene fiber, which ensures the strength of the composite cloth. The overall breathable performance of the composite cloth is good, the cool feeling effect is strong, and the wearing comfort is high.

This invention discloses a ceramic formula and preparation method for high-pressure dehydration molding using porous resin molds for large ceramic jars, belonging to the field of ceramic manufacturing technology, and particularly for the production of large ceramic wine jars (capacity ≥ 1000 liters). Existing porous resin mold high-pressure dehydration processes for large ceramic jars suffer from problems such as cracking and excessively long drying and firing times. The clay formula of this invention, by weight ratio, includes 0-50% kaolin, 0-30% bauxite, 0-100% clay, 0-50% feldspar, 0-20% quartz, 0-20% waste ceramic particles, 0-40% calcined kaolin particles, 0-15% flux or lubricant, and 0-10% added fiber, such as polypropylene fiber or basalt fiber, which constructs a reinforcing and crack-resistant structure within the clay. The preparation method includes steps such as raw material processing, mixing and kneading the clay, aging, porous resin mold molding, high-pressure dehydration and demolding, drying and glazing, and firing. The ceramic jar has a firing cycle of 25–35 hours, a maximum firing temperature of 1180–1220℃, and a bulk density of 2.2–2.5 g / cm³. 3 It possesses characteristics such as deformation less than 10mm, shrinkage less than 10%, and water absorption less than 3%. This invention effectively solves the cracking problem by reinforcing the clay with fibers, significantly shortening drying and firing time, improving production efficiency and product quality, and reducing energy consumption. It provides technical support for the efficient production of large ceramic jars and has broad application prospects and promotional value.

This disclosure presents a flexible insulating and thermally conductive thin film material, its preparation method, and its applications, belonging to the interdisciplinary field of advanced functional materials and thermal management. The flexible insulating and thermally conductive thin film material includes: a flexible insulating substrate layer comprising a high thermal conductivity / high insulation fiber network formed by polypropylene fiber network (PNF); a thermally conductive reinforcement layer comprising two-dimensional reduced graphene oxide (rGO) sheets embedded within the high thermal conductivity / high insulation fiber network to form a PNF / rGO composite framework; and a thermally conductive network layer comprising gallium-based liquid metal encapsulated by an insulating shell, with the gallium-based liquid metal filling the microporous structure of the PNF / rGO composite framework to form a continuous three-dimensional interpenetrating thermal conductive path. This disclosure forms a novel liquid metal-based composite thin film material that combines high thermal conductivity, high electrical insulation, and excellent flexibility, achieving a synergistic unity of efficient thermal conductivity, high electrical insulation, and structural stability.

The application discloses a method for hydrophilic modification of polypropylene fibers and reinforced inorganic terrazzo flexural strength based on BP neural network, which comprises the following steps: 1) preparing modified polypropylene fibers by using ultraviolet lamp and silane coupling agent; 2) screening the optimal modification condition by using BP neural network; and 3) hydrophilic modification of polypropylene fibers reinforced inorganic terrazzo. The method for hydrophilic modification of polypropylene fibers provided by the application screens the optimal modification condition by using BP neural network; the polypropylene fibers are irradiated by using ultraviolet grafting method, so that the chains on the surface of the fibers are degraded, the carbonyl groups are generated, and the surface of the polypropylene fibers is etched to increase the surface roughness; and the surface of the polypropylene fibers is hydrophilically modified by using solution grafting method with anhydrous ethanol, water and silane coupling agent KH-570 solution. The modified polypropylene fibers prepared by using the method have excellent hydrophilic performance, the preparation process is simple, and a new idea is provided for quickly screening the optimal modification condition.