1418results about "Ultrasonic/sonic fibre treatment" patented technology

A method of rendering materials having hard and soft surfaces hydrophilic or more hydrophilic is disclosed. The method involves hydrophilizing such materials by applying a high energy treatment and charged particles and / or one or more hydrophilic polymeric materials with discrete charges to such materials.

Electret filter media comprising a nonwoven web of thermoplastic nonconductive microfibers having trapped charge, said charge provided by (1) subjecting the nonwoven web to a corona treatment, followed by (2) impingement of jets of water or a stream of water droplets on the web at a pressure sufficient to provide the web with filtration enhancing electret charge and (3) drying the web. This electret filter media may be used in a respiratory mask to provide extraordinarily good filtration properties.

The application discloses methods of plasma treatment that employ an ion sheath in a capacitively-coupled system to increase the hydrophilicity of porous articles, including microporous articles having pore sizes of 0.05 to 1.5 micrometers, both on their surfaces and in their pores such that the articles' bulk wetting properties are improved.

A porous substrate is pretreated in a plasma field and a functionalizing monomer is immediately flash-evaporated, deposited and cured over the porous substrate in a vacuum vapor-deposition chamber. By judiciously controlling the process so that the resulting polymer coating adheres to the surface of individual fibers in ultra-thin layers (approximately 0.02–3.0 μm) that do not extend across the pores in the material, the porosity of the porous substrate is essentially unaffected while the fibers and the final product acquire the desired functionality. The resulting polymer layer is also used to improve the adherence and durability of metallic and ceramic coatings.

This invention concerns coatings having high surface area materials and at least one metal ion adsorbed onto the high surface area material as well as substrates having the coating and methods of applying the coating. The substrates may be films, woven fabrics or may be nonwoven fabrics. The coatings have good odor and / or gas absorbing capabilities. Nonwoven fabrics include tissues, towels, coform materials, bonded carded webs, spunbond fabrics and so forth. The substrates may be made into storage and packaging material to reduce odor and retard the ripening of fruit. The substrates may be used in personal care products, to produce clothing for military and civilian applications and many other applications.

Rotary spinning processes, more particularly processes for making hydroxyl polymer-containing fibers using a rotary spinning die, hydroxyl polymer-containing fibers made by the processes and webs made with the hydroxyl polymer-containing fibers are provided.

A decorticated bast fiber such as from flax that is particularly suitable as a reinforcement for polymeric resins, thermoplastic, and thermoset composites. The invention specifically overcomes past difficulties involving compounding and injection molding of composite specimens with bast fiber reinforcements. In one form, ultrasonic energy is applied to decorticated bast fibers to cause fibrillation.

Disclosed is an electroconductive fiber comprising synthetic fibers and an electroconductive layer covering the surface of the synthetic fibers and containing carbon nanotubes. Not less than 60% (particularly not less than 90%) of the total surface of the synthetic fibers is covered with the electroconductive layer, and the electric resistance of the electroconductive fiber is in the range of 1*10<-2> to 1*10<10> Omega / cm, and the standard deviation of the logarithm of the electric resistance is less than 1.0. The thickness of the electroconductive layer is in the range of 0.1 to 5 micrometers, and the amount of the carbon nanotubes may be 0.1 to 50 parts by mass based on 100 parts by mass of the synthetic fiber. The electroconductive fiber may contain a binder. The electroconductive fiber may be produced by immersing the synthetic fibers in a dispersion while applying vibration to the synthetic fibers to deposit an electroconductive layer on the surface of the synthetic fibers. In the electroconductive fiber, the carbon nanotubes are deposited evenly and strongly onto substantially the whole area of the surface of the fibers, and, thus, the electroconductive fiber is electroconductive and flexible.

An absorbent paper sheet is treated with an aqueous wax dispersion such that the sheet includes a fused wax and emulsifier residue in an amount of from about 1 to about 20 weight percent of the sheet based on the combined weight of the fiber, wax residue and an emulsifier residue in the sheet. The fused wax emulsion operates to make at least one surface of the sheet laterally hydrophobic, exhibiting a moisture penetration delay of at least about 2 seconds and less than about 40 seconds as well as a typical contact angle with water at one minute of at least about 50 degrees. There is thus provided absorbent products which exhibit both absorbency and resistance to moisture penetration. The treated sheet further exhibits microbial barrier properties, impeding transfer of bacteria, for example, through the sheet. There are produced tissue products which resist moisture penetration from propelled liquids as well as sequester sorbed liquids in the interior of the tissue.

A decorticated bast fiber such as from flax that is particularly suitable as a reinforcement for polymeric resins, thermoplastic, and thermoset composites. The invention specifically overcomes past difficulties involving compounding and injection molding of composite specimens with bast fiber reinforcements. In one form, ultrasonic energy is applied to decorticated bast fibers to cause fibrillation.

The invention discloses a preparation method of a soft and durable anti-penetrating material. The preparation method is characterized by comprising the following steps: (1) preparing shearing thickening liquid; (2) preparing a high performance fiber fabric with a special tissue structure, namely preparing a fabric from high performance fibers by virtue of a special tissue structure weaving process, putting the fabric into a vacuum drying oven, and drying at 120-150 DEG C for 2-3 hours; and (3) preparing the anti-penetrating material. According to the method, by virtue of reasonable tissue structure configuration on the fabric and plasma treatment on the shearing thickening liquid and the fabric, the shearing thickening liquid and the fabric are adequately compounded, so that the durabilityand flexibility of the anti-penetrating material are improved, and the soft and durable anti-penetrating material suitable for multiple environments of daily protective clothes of military police, armored military equipment, civil and industrial protection and the like is prepared.

This invention concerns coatings having high surface area materials and at least one metal ion adsorbed onto the high surface area material as well as substrates having the coating and methods of applying the coating. The substrates may be films, woven fabrics or may be nonwoven fabrics. The coatings have good odor and / or gas absorbing capabilities. Nonwoven fabrics include tissues, towels, coform materials, bonded carded webs, spunbond fabrics and so forth. The substrates may be made into storage and packaging material to reduce odor and retard the ripening of fruit. The substrates may be used in personal care products, to produce clothing for military and civilian applications and many other applications.

Dispersable pastes comprising single-walled carbon nanotubes (SWNT) in water or in an organic solvent are prepared. The method of preparing the dispersable pastes comprises in general the following steps: a) removal of the catalyst used during the synthesis of SWNT; b) while the SWNT are still wet, addition of the appropriate amount of solvent, in a solvent / SWNT ratio which preferably varies between 30:1 and 100:1, depending on the desired viscosity of the paste; and c) high-energy horn sonication with a dismembrator probe. The resulting pastes are suitable for easy redispersion in solvents and incorporation in various matrices such as polymers. They are also suitable to be impregnated with metal precursors such as noble metal compounds for example, Pt. Appropriate drying and thermal treatments of the impregnated material produce metal-SWNT composites in which small metal clusters can be uniformly dispersed over the nanotube surface. These metal-SWNT composites may find applications as catalysts as well as electrodes for fuel cells, batteries, and capacitors.

The invention discloses a high-throughput efficient 2D net-shaped ultrafine nanofiber oil-water separation material and a preparation method thereof. The preparation method comprises the following steps: a polymer solution is prepared from a selected polymer, a net is formed through electrostatic direct injection of the polymer solution, a spinneret vibrates in situ by the aid of external force inan electrostatic direct injection process to promote generation of charged droplets, the droplets are subjected to phase separation, and a uniform 2D net-shaped ultrafine nanofiber material is formedon the surface of a receiving substrate and is in a continuous and seamlessly stacked shape; then the obtained material is subjected to surface modification, and the 2D net-shaped ultrafine nanofiberoil-water separation material with selective surface and interface wetting property is obtained. The preparation process is simple, raw material limitations are few, and the net-shaped ultrafine nanofiber oil-water separation material has tiny meshes and good pore channel connectivity and has great application prospect in the fields of oil purification, oil-containing wastewater treatment and thelike.

The invention discloses a melt-blow non-woven material capable of effectively filtering PM 2.5 particles, a preparation method and a production device. The melt-blow non-woven material comprises, by weight percentage, 93-97 parts of polypropylene, 3-6 parts of electret master batch and 0.1-1 part of polyvinylidene fluoride. According to the melt-blow non-woven material capable of effectively filtering PM 2.5 particles, the polypropylene, the electret master batch and the polyvinylidene fluoride are compounded, the obtained melt-blow non-woven material is characterized by high porosity, the fiber diameter of smaller than two micrometers, large clogging capacity, high filtering efficiency and low resistance, an electret is good in charge storage performance after electret processing, the charge keeping rate can be above two years, and the electret can be used in a high-temperature and high-humidity environment. The product is environmentally friendly and free of pollution, has the advantages of being long in service life and wide in use range, and is particularly suitable for removing PM 2.5 particles in the air.