63 results about "Fibre dispersion" patented technology

The invention relates to a preparation method of a continuous fiber reinforced thermoplastic composite material prepreg and equipment thereof. The method comprises the following steps: (a) leading out and unfolding continuous fiber from a creel (10) to pass a tension adjusting device (20) and a static elimination device (30) in sequence, sending the fiber to a preheating oven (40) to preheat, and then passing a tension adjusting device (50); (b) leading a preheated continuous fiber band into a dual-extrusion die head set which can be opened and closed in a staggered manner to presoak; and (c) leading the presoaked continuous fiber band into a soaked rolling roll set (70) to soak, then cooling by a cooling roll-in device (80), and finally leading into a traction rolling device (90) for shaping by winding to obtain the product. Compared with the prior art, the invention significantly improve the dispersion, infiltrating property and operability of the fiber, and obtains the continuous fiber reinforced thermoplastic composite material prepreg which has uniformly dispersed and completely soaked fiber.

Disclosed is a fine-fibers-dispersed nonwoven fabric comprising dispersed fine fibers having a fiber diameter of 4 μm or less and a fiber length of 3 mm or less, wherein an adhesion rate of substances adhered to the nonwoven fabric is 0.5 mass % or less. Further, a process and an apparatus for manufacturing the fine-fibers-dispersed nonwoven fabric, as well as a sheet material comprising the fine-fibers-dispersed nonwoven fabric are also disclosed.

In one aspect, the invention is directed to an efficient and economical process for dispersing fiber in water and clay. In another aspect, the process for dispersing fiber in water and clay is used in methods of making fiber reinforced composite products. In another aspect, the dispersed fiber/clay material is formulated to make products which include, but which are not limited to, fiber reinforced thermoplastic composites, paperboard products, kitty litter, and/or lightweight building materials comprising fiber.

An object of the present invention is to provide a spongelike structure or a powder having fibers three-dimensionally arranged therein with high dispersibility, whose apparent density can be designed depending on the purpose or utility, as well as a process producing them. A fiber dispersion in which fibers having a number mean diameter in a predetermined range are dispersed in a dispersion medium, and this fiber dispersion is dried to remove the dispersion medium, thereby, a spongelike structure and a powder are produced.

Provided is a method which is capable of producing a cellulose nanofiber dispersion liquid that has a low viscosity and excellent fluidity even at a high concentration, while exhibiting excellent transparency. In a method for producing cellulose nanofibers, wherein a cellulosic starting material is oxidized in water using an oxidant in the presence of an N-oxyl compound and a compound that is selected from the group consisting of a bromide, an iodide and a mixture thereof and the thus obtained oxidized cellulose is defibrated and dispersed, pulp which is obtained by carrying out kraft cooking after a hydrolysis process is used as the cellulosic starting material.

A coating composition that improves fiber dispersion and mechanical properties in reinforced composite articles is provided. The coating composition includes a chemical compound that acts as an emulsifier, a surfactant, and a melt viscosity reducer. In at least one exemplary embodiment, the chemical compound is an ethoxylated fatty acid or an ethoxylated fatty alcohol compound. The coating composition may be applied to the reinforcing fiber strand after a conventional sizing composition has been applied to the reinforcing fiber and prior to wire coating the fiber with a thermoplastic resin. The coated/sized fiber strands may be chopped to form chopped strand segments and then densified or compacted to form a densified reinforcing fiber product, such as pellets. These pellets, in turn, may be used to form polymer reinforced composite articles. In alternative embodiments, the coating composition may be applied directly to the reinforcement fibers directly after fiber formation under the bushing.

The invention discloses a device and method for realizing microwave frequency conversion by utilizing a double-drive DPMZM, relates to the technical field of microwaves and the technical field of optical communication, and is mainly used for frequency conversion of a microwave signal. The method comprises a light source, a radio-frequency signal source, an intrinsic signal source, an electric shunt device, a phase shifter, the double-drive DPMZM and a photoelectric detector (as drawing show). Double-sideband modulation of a radio-frequency signal and a single-sideband modulation of an intrinsic signal are respectively realized by utilizing the double-drive DPMZM; an optical carrier of an output signal of the double-drive DPMZM can be inhibited by reasonably setting a parameter; and, a frequency conversion signal can be obtained after the frequency of the output signal of the double-drive DPMZM is beaten through the photoelectric detector. The scheme has relatively high conversion efficiency; and furthermore, the power periodic fading due to optical fibre dispersion in a signal transmission process can be avoided.

A process for producing an optical fiber cable composite structural component, such as reinforcing members, buffer tubes, filler rods, jackets, and slotted cores, is disclosed. The composite structural components are produced by co-extruding a thermotropic liquid crystalline polymer (TLCP) and a thermoplastic matrix material into the composite structural component so that TLCP reinforcing fibrils are dispersed in the thermoplastic matrix material. The TLCP reinforcing fibrils undergo a high level of process induced orientation, are provided with a high aspect ratio, and small diameters. The composite structural component has a high modulus. The TLCP reinforcing fibrils may be made continuous or discontinuous.

The invention discloses a preparation method of an aqueous dispersion of aramid nano-fibers. The method comprises the following steps: adding an aramid fiber, potassium hydroxide, a cosolvent and a solvent into a container, and performing heating and stirring for dissolving to obtain aramid nano-fibers dispersed in the KOH/DMSO system; adding deionized water to the dispersed aramid nano-fiber dispersion under the action of high-speed shearing stirring to obtain an aramid nano-fiber dispersion dispersed in the KOH/DMSO/H2O system; immersing the aramid nano-fiber dispersion in deionized water, and carrying out dialysis treatment to obtain an aqueous dispersion of aramid fibers; and carrying out high-pressure homogenization treatment on the aqueous dispersion of aramid fibers to obtain the uniform and stable aqueous dispersion of aramid nano-fibers. The aramid nanofibers prepared in the invention have the advantages of small diameter, high length-diameter ratio and excellent heat resistance, can be stably dispersed in the aqueous system, and has a greatly expanded application range.

The invention belongs to the field of preparation of chitin nano fiber and relates to a preparation method of chitin nano fiber dispersion liquid with high carboxyl content, the chitin nano fiber dispersion liquid with high carboxyl content and application. The preparation method comprises the following steps: pre-treating a chitin raw material to obtain chitin slurry; oxidizing the chitin slurryby utilizing a TEMPO oxidation system to obtain oxidized chitin; and performing homogenization and ultrasonic treatment on the oxidized chitin to obtain the chitin nano fiber dispersion liquid with high carboxyl content. Polar solvent high temperature, polar solvent low temperature and mechanical pre-treatment methods are innovatively combined with the TEMPO oxidation system respectively so as topre-treat chitin, and then, a weakly acidic, neutral and alkaline TEMPO oxidation system is adopted to perform selective oxidation modification, thereby effectively reducing the dosage of a chemical oxidant, reducing the degradation loss of chitin in a chitin nano fiber preparation process, realizing efficient preparation of the chitin nano fiber with high carboxyl content, and providing a new idea for realizing high-value utilization of the chitin nano fiber.

An alumina fiber aggregate which is minimized in scatter of fibers, excels in handling characteristics and working environmental hygiene and finds its useful application to support mats for catalytic converters and such is provided. An alumina fiber aggregate comprising alumina short fibers having such properties that when diameters of said alumina short fibers are represented by x (μm), the rate at which the natural logarithmic value lnx in lognormal distribution of x is less than ln3 is not more than 2%, and the value left after deducting from the length-weighted geometric mean of said fiber diameters a value twice its standard error is not more than 6 μm; and a support mat for catalytic converters comprising such an alumina fiber aggregate.

The invention provides a prefabricated fiber dispersing device and method and application thereof. Two-stage dispersion is adopted, fibers are firstly put into a gear disperser composed of two engaged gears for first-stage dispersion, liquid mixed with the fibers is pressurized through a screw pump, a high-pressure area is formed on a throttling device, finally the mixture is injected into a prefabricating tank, second-stage dispersion is achieved, the fibers are expanded and dispersed from the high-pressure area to a low-pressure area, and liquid in which the fibers are evenly dispersed is formed. The whole process is controlled through a controller in real time, and the number of circulating times can be adjusted according to the dispersion degree of the fibers. The need of evenly dispersing the fibers in the liquid can be met through the two stages of dispersion, the sand carrying capacity of the liquid can be improved through the evenly dispersed fibers, the laying degree of a propping agent in a crack can be promoted, the friction of the liquid is reduced, leak off of the liquid in the stratum is reduced, and backflow of the propping agent is prevented.

The invention relates to the technical field of metal-based composite materials, in particular to a method for preparing a short carbon fiber enhanced metal-based composite material through combination of a machine and electromagnetic stirring. The preparation method is also applicable to preparation of aluminum alloy, zinc alloy, cast iron and other carbon fiber enhanced metal-based composite materials. The problems that after melt in a crucible is stable in the prior art, a single flow field exists in the crucible, nonuniform fiber dispersion and single fiber distribution orientation are likely to occur, and dead areas exist in the melt are solved. The machine and electromagnetic stirring are combined to prepare the short carbon fiber enhanced metal-based composite material, the flow field in the melt becomes complex through the synthetic effect between electromagnetism and mechanical stirring, and therefore multi-direction dispersion of fiber is achieved.

The fibre dispersion compensation equipment includes dispersion compensation module, and includes a three-port irreversible optical device and an optical reflector device. Said three-port irreversible optical device, dispersion compensation module and ptical reflector device are sequentially connected, the optical signal is fed into first port of the above-mentioned three-port irrevesible opticaldevice, and outputted from second port and fed into dispersion compensation module to make dispersion compensation, then reflected by optical reflector device and fed into dispersion compensation module again to make secondary dispersion compensation, then said optical signal is fed into second port, and is outputted from third port, and fed into the dispersion compensation module, so that it cangreatly raise utilization rate of dispersion compensation optical fibre.

The invention discloses a moisture dispersible fibre which comprises the following components by weight: fibre, 60-80 portions; water with the hardness of 0.02-1.50mmol/L, 20-40 portions; dispersing agent, 0.1-0.5 portions; antifoaming agent, 0.1-0.6 portions; and mouldproof bactericides, 0.1-0.4 portions. With the invention, uniform dispersion of the fibre in the concrete can be realized without lowering and damage of various performances of the fibre, and the overall performance of the concrete is excellent, thereby engineering quality requirements can be met; fibre dispersion has high security and long storage time, and can not only be mixed and used in field but also be mixed and stored for further use; simultaneously the fibre dispersion is safe to use with no influence on the health of workers, the addition is accurate and the dosing of concrete water mixed is saved.

The invention discloses a dope used for high-luster high-opacity paper as well as a manufacture method and application thereof. The dope used for paper is manufactured and obtained according to the following methods: dispersing a microfine fiber into a dispersing suspension liquid with a mass concentration of 10 to 30 percent, namely obtaining a microfine fiber pulp, mixing with a macromolecule aqueous liquid with a mass concentration of 10 to 50 percent and stirring uniformly, namely obtaining the dope used for high-luster high-opacity paper; the oven dry mass proportion of the microfine fiber and the macromolecule aqueous liquid is 1.5:1 to 4:1. Compared with the existing dope used for paper, the paper coat formed by the dope used for paper of the invention has more excellent lustrousness, opacity and brightness.

The invention discloses a device and a method for detecting the dispersing performance of chemical synthesized short fibers. The device is characterized by being vertically provided with a cylinder; a middle filtering layer is arranged in the cylinder; a stirring shaft for forming a dispersing stirrer is axially arranged above the middle filtering layer; a water inlet pipe which is provided with a water inlet valve and a liquid discharge pipe which is provided with a liquid discharge valve are respectively arranged below the middle filtering layer; the middle filtering layer comprises a filter screen and a filter cloth which is arranged on the filter screen; and an air inlet pipe is radially arranged on the side wall of the cylinder, at the bottom of the stirring shaft and above a middle interlayer. The invention has compact device structure and simple and convenient method operation and can be used for rapidly and accurately detecting various defects of paralleled yarns, sticking yarns, doubling yarns, gommures, and the like existing in the chemical synthesized short fibers by the dispersing situation of the short fibers in water.

The invention discloses a transmitter of an OOFDM system and a method of delay caused by pre-compensated optical fibre dispersion. The pre-compensated method comprises the steps of: receiving a plurality of pre-compensated values corresponding to a subcarrier; transmitting the subcarrier after the time for delaying the corresponding pre-compensated value; estimating the delay time among the subcarriers at the receiver end and setting the pre-compensated value of the transmitter based on the delay time. The transmitter delays the pre-compensated value when the subcarrier is transmitted out so that the subcarrier reaches the receiver during the period of time consistent to achieve the purpose of delay caused by the pre-compensated optical fibre dispersion.

The invention relates to a preparation method for fiber reinforced concrete with uniformly-dispersed basalt fibers. According to the invention, a fiber dispersant is divided into two types, wherein afiber dispersant A is composed of a 4-amino-1,2-catechol hydrochloride solution with a concentration of 1 to 3 g/L and a trishydroxymethylamino methane solution with a concentration of 10 to 12 g/L; and a fiber dispersant B is composed of a sodium chloroacetate solution with a concentration of 12 to 15 g/L, a sodium hydrogen carbonate solution with a concentration of 3 to 5 g/L and a dimethylformamide solution with a concentration of 15 to 20 g/L. The preparation method for the fiber reinforced concrete with uniformly-dispersed basalt fibers comprises the following steps: placing the basalt fibers into the dispersant A, carrying out stirring for 3 to 5 minutes, then placing an obtained mixture into the dispersant B, and carrying out stirring for 1 to 3 minutes so as to obtain treated basalt fibers; and mixing a weighed cementitious material with the treated basalt fibers under stirring for 1 to 3 minutes, then adding sand stones, clear water and a polycarboxylate water-reducing agent,placing an obtained mixture on a horizontal vibration table, and carrying out vibration under stirring for 2 to 5 minutes so as to obtain the fiber reinforced concrete with uniformly-dispersed basaltfibers. The method provided by the invention effectively solves the defect of difficulty in uniform dispersion of fibers in concrete.

The invention relates to a thermoplastic composite core for an overhead conductor and a manufacturing method thereof. As the matrix fiber made of the thermoplastic material is used as the matrix material, the reinforcing fibers are dispersed among the matrix fibers, and the matrix fibers are bonded to each other into an integrated structure by the thermoplastic molding method, so that the reinforcing fibers are wrapped to form a composite core. As such, on that one hand, the matrix fib made of the thermoplastic material can be quickly molded into an integral body with the reinforce fiber without completely melting the matrix material and then solidifying molding as in the prior art, and therefore, the production efficiency is high; On the other hand, the manufacturing process does not completely melt the matrix fibers, and the matrix fibers do not adhere to the mold to generate waste, so the production cost is low.