342 results about "Fiber size" patented technology

A porous monocomponent nonwoven web contains a bimodal mass fraction/fiber size mixture of intermingled continuous microfibers and larger size fibers of the same polymeric composition. There are at least five times as many microfibers as larger size fibers, and a histogram of the mass fraction of fibers vs. fiber size exhibits a larger size fiber mode greater than 10 μm. The web may be made by flowing fiber-forming material through a die cavity having larger size orifices and at least five times as many smaller size orifices to form filaments, attenuating the filaments into fibers and collecting the attenuated fibers to form the nonwoven web. The web is especially well suited to the manufacture of self-supporting three dimensional articles such as molded cup-shaped respirators and pleated air filters.

A pleated filter is made from a monocomponent monolayer nonwoven web containing a bimodal mass fraction/fiber size mixture of intermingled larger size and smaller size continuous monocomponent polymeric fibers of the same polymeric composition. Rows of pleats are formed in the nonwoven web, and the pleated web is cut to a desired size and shape to provide a filter element containing a self-supporting porous monocomponent monolayer matrix of fibers bonded to one another at at least some points of fiber intersection and having an average initial submicron efficiency of at least 15% at a 1.52 meters/sec face velocity. The filter element is deformation resistant without requiring stiffening layers, bicomponent fibers or other reinforcing measures in the filter media layer.

The invention discloses an emulsion type carbon fiber sizing agent, which comprises main size, an emulsifier, an aid and deionized water. The aid comprises a diluent and a penetrant, wherein the emulsifier is 5 to 15 mass percent of the main size, the diluent is 0 to 120 mass percent of the main size, the penetrant is 1 to 5 mass percent of the main size, and the mass ratio of the deionized water to the main size is 50-90:10-50. The invention also discloses a preparation method and application of the sizing agent. The sizing agent is suitable for unsaturated polyester resin and solves the problem of poor adhesion of the unsaturated polyester resin and the carbon fiber. After the sizing agent is used for sizing, the wear resistance of the carbon fiber is improved, and the broken filament amount is reduced, the post-processing performance of the fiber is improved, the interface adhesion of the carbon fiber and matrix resin is better, the shear strength between layers is improved, and the performance of composite materials is also improved.

The invention relates to a carbon fiber emulsion sizing agent improved by a carbon nano tube and a preparation method of the carbon fiber emulsion sizing agent. The carbon fiber emulsion sizing agent comprises a carbon fiber sizing agent, the carbon nano tube, a dispersing agent and a solvent. The preparation method comprises the following steps of: 1, preparing the carbon fiber sizing agent; and 2, adding the carbon fiber sizing agent into the solvent to prepare a sizing working solution, mixing the carbon nano tube and the sizing working solution, performing ultrasonic treatment for 1 to 4 hours at the power of 300 to 600w, adding the dispersing agent, and performing ultrasonic dispersion for 2 to 4 hours to obtain the carbon fiber emulsion sizing agent improved by the carbon nano tube. The carbon fiber emulsion sizing agent has favorable stability, the post processability of carbon fiber can be improved after being processed by the emulsion sizing agent, the interfacial bond strength between the carbon fiber and substrate resin can be enhanced, the shear strength among layers is enhanced, and the performance of a composite material is improved to a certain extent. Moreover, the preparation method is simple, low in cost and environment-friendly.

A wrapped article (20) includes a personal care absorbent personal care article (22), and a separately provided wrap member (24) which operatively encloses the absorbent personal care article (22). At least a major portion of the wrap member (24) includes an outer layer (26), an inner layer (28) and an intermediate layer (30) that is sandwiched between the inner and outer layers, and includes an operative amount of an odor control agent (32). In particular aspects, the intermediate layer (30) can include a nonwoven fibrous web, and the fibrous web can have selected fiber sizes. In another aspect, the intermediate layer (30) of the wrap member (24) can include a meltblown nonwoven web. In further aspects, the outer layer (26) can include a nonwoven fibrous web having particular fiber sizes, and the inner layer (28) can include another nonwoven fibrous web having the same or different fiber sizes.

A fiber-size composition contains a modified polyolefin, a hydrophilic coupling agent, and an enhancer with at least one of the following: a fluorine-containing compound, a hydrophobic coupling agent, a cyclic fatty acid, or at least two saturated fatty acids with at least one of said fatty acids having at least two acid groups. When reinforcing fiber materials sized with the composition are used to form composite articles, the articles show improved properties such as strength and color.

A molded respirator is made from a monocomponent monolayer nonwoven web containing a bimodal mass fraction/fiber size mixture of intermingled continuous monocomponent polymeric microfibers and larger size fibers of the same polymeric composition. The respirator is a cup-shaped porous monocomponent monolayer matrix whose matrix fibers are bonded to one another at at least some points of fiber intersection. The matrix has a King Stiffness greater than 1 N. The respirator may be formed without requiring stiffening layers, bicomponent fibers, or other reinforcement in the filter media layer.

The present invention provides a heat insulator that is extremely low in environmental load during production and recycling, is superior in handleability and workability, and shows favorable heat-insulating properties over an extended period of time. The present invention relates to vacuum heat insulator, comprising at least a core member and an external packaging member that stores the core member and can keep inside under reduced pressure, wherein the core member is a sheet-shaped fiber aggregate containing a polyester fiber having fiber size of 1 to 6 deniers in an amount of 50 wt % or more.

The invention discloses a tension control device of fiber sizing equipment of a winding machine and a control method thereof. The control device comprises a servo motor, a motor driver, a glue dipping roller, a tension sensor, a tension signal amplifier, a PLC (Programmable Logic Controller), a spring guide roller, a frictioning plate and a roller wheel. The control method comprises the following steps of: firstly, initializing, pre-tightening fiber and starting the device; secondly, measuring the tension value of the fiber by the tensor sensor, and transmitting the tension value to the PLC; thirdly, transmitting a control signal to the motor driver by the PLC; fourthly, controlling the tension of the fiber and the preset value of the tension to be in an error range by the motor driver through the rotating speed of the glue dipping roller controlled by the servo motor; and fifthly, transmitting the fiber to the winding machine through the frictioning plate. The invention has high tension control precision and can monitor the tension in real time. Compared with spring measuring equipment, the tension control device of the fiber sizing equipment of the winding machine greatly improves the measuring precision and the response speed and is convenient to operate.

A fiber size composition contains a modified polyolefin, a hydrophilic coupling agent, a boron-containing, fluorine-containing compound, a blend of at least two fatty acids and a compound selected from phosphorus(V) compounds and sulfur(VI) compounds, the fiber size composition being substantially free of conventional lower oxidation state antioxidants and optical brighteners. Composite materials produced from reinforcing fiber materials sized with a fiber size composition according to the invention exhibit improved properties such as, for example, increased strength and/or improved color stability.

The invention discloses an emulsion type carbon fiber sizing agent and a preparation method and application thereof. The sizing agent comprises main size, an emulsifier, graphene oxide, a diluent and water, wherein the amount of the emulsifier is 0.5-6 weight percent of that of the main size; and the amount of graphene oxide is 0.1-2 weight percent of that of the main size. The preparation method comprises the following steps: mixing the main size, the diluent and the emulsifier, stirring and premixing; and slowly adding an aqueous solution of graphene oxide for performing phase inversion emulsification to form Pickering emulsion in which graphene oxide and the emulsifier are stable, thereby obtaining the sizing agent. The preparation method disclosed by the invention is easy to operate, the stability of the sizing agent is improved by adopting the synergistic effect of graphene oxide and the emulsifier, the amount of the emulsifier is reduced, the environmental pollution is alleviated, the defects that the sizing agent with a single stable emulsifier is low in stability and the amount of the emulsifier is extremely large are overcome, the selection range of the main size is widened, the performances of carbon fibers can be improved after sizing, an interface bonding effect of a carbon fiber composite material is enhanced, and the mechanical strength of the carbon fiber composite material is improved.

The invention discloses a carbon fiber sizing agent which is prepared from the following materials in parts by weight: 5-25 parts of phenolic resin, 1-5 parts of blend resin, 0.01-5 parts of antistatic agent and 100 parts of solvent, wherein the phenolic resin is thermoplastic phenolic resin or modified phenolic resin, and the blend resin is thermoplastic resin or thermosetting resin. The carbon fiber sizing agent is prepared through the following steps of: firstly, uniformly mixing the phenolic resin and the blend resin, adding a solvent accounting for 10-20% of the total amount of the solvent, enabling the resin to be dissolved in the solvent, and stirring the obtained mixture into a homogeneous solution at room temperature; and then, adding the antistatic agent into the homogeneous solution, stirring the obtained mixture so as to dissolve the antistatic agent, adding the rest of the solvent, and mixing the obtained product so as to obtain an integral solution, thereby obtaining the carbon fiber sizing agent. The carbon fiber sizing agent disclosed by the invention can be compatible with thermoplastic matrix resin better; the matrix resin can fully wet carbon fibers, thereby directly achieving a stress transfer effect on the fibers and the matrix; and compared with an epoxy resin sizing agent, the interlayer shear strength of a composite material of the carbon fiber sizing agent is increased by 15-20%.

The invention relates to a preparation method of a graphene-modified carbon fiber sizing agent. The preparation method includes the steps of firstly, mixing solid-state epoxy resin and liquid-state epoxy resin in a fusion manner under 60-100 DEG C to obtain mixed epoxy resin; secondly, adding anionic surfactant, and stirring for emulsifying; thirdly, adding nonionic surfactant, stirring, dripping distilled water, and stirring until the system has phase reversing to obtain a sizing emulsion; fourthly, preparing a modified graphene solution; fifthly, mixing and dispersing the sizing emulsion and the modified graphene solution to obtain the graphene-modified carbon fiber sizing agent. The invention further relates to the graphene-modified carbon fiber sizing agent prepared by the method. The graphene-modified carbon fiber sizing agent prepared by the method is small and even in particle size and can well combine with the surfaces of carbon fibers. By the preparation method, the problems that the graphene is unevenly dispersed and poor in stability are solved.

The invention discloses a formula and preparing method of a carbon fiber sizing agent for reinforcing polypropylene. Compared with traditional solvent type sizing agents, the prepared sizing agent has the advantages of being low in toxicity, low in cost, low in pollution and the like with water serving as the continuous phase. Besides, the sizing agent is suitable for a polypropylene resin matrix and solves the problem of poor cohesiveness between carbon fiber and polypropylene resin. When the sizing agent is used for sizing, the post processing capacity of carbon fiber is improved remarkably, the cohesiveness of the interface between carbon fiber and polypropylene matrix resin is high, and the macroscopical mechanical strength of a carbon fiber/polypropylene composite material is improved to a large extent.

Disclosed is a vacuum heat insulation material which places very little burden on the environment during production and recycling processes. This vacuum heat insulation material has excellent handling properties and workability, and keeps providing good heat insulation for a long time. Specifically disclosed is a vacuum heat insulation material which is characterized by comprising at least a padding material and an envelope for holding the padding material which envelope is capable of maintaining the inside at a reduced pressure. The vacuum heat insulation material is also characterized in that the padding material is composed of a sheet-like fiber assembly containing not less than 50% by weight of polyester fibers having a fiber size of 1-6 denier.

The invention provides a preparation method of a dimer acid modified epoxy resin toughened carbon fiber prepreg, which comprises the following steps: by taking a component of which the molecular structure is similar to that of a carbon fiber sizing agent as toughener, preparing a dimer acid modified epoxy resin through a pre-reaction method; adding reactants into the mixed epoxy resin, adding a latent curing agent, and evenly mixing to obtain a resin system for the prepreg; and coating the resin system through a film coating machine, and then compounding with carbon fibers or a fabric made therefrom to prepare the moderate-temperature curing prepreg having fine operability and adhesivity. Compared with the traditional rubber toughened prepreg, the invention can enhance the wettability of the resin system on carbon fibers, reduce the moisture permeability of the prepreg and simultaneously improve the toughness and impact resistance of the composite material, thus being suitable for manufacturing of a prepreg for winding formation.