106 results about "Microfibril" patented technology

A composite structure mainly composed of hydratable fine fibers in the form of microfibril and a water swellable solid body, the fibers being obtained from cellulose or derivatives thereof, and at least part of the surface of the solid body is covered with the fine fibers. The absorbent composite can be formed in various form of, for example, particle, pellet, sheet and the like, especially of a sheet type with a supporting sheet of a non-woven fabric. The present invention further provides a method of making the composite structure.

A composite structure mainly composed of hydratable fine fibers in the form of microfibril and a water swellable solid body, the fibers being obtained from cellulose or derivatives thereof, and at least part of the surface of the solid body is covered with the fine fibers. The absorbent composite can be formed in various form of, for example, particle, pellet, sheet and the like, especially of a sheet type with a supporting sheet of a non-woven fabric. The present invention further provides a method of making the composite structure.

The invention discloses a method for in situ generating a nano cellulose microfibril reinforced polymer composite material, comprising the following steps: using ionic liquid as a primary solvent, dissolving cellulose, or mixing cellulose with other polymers via solution mixing, and controlling the solubility of the cellulosic material in the solvent to maintain naturally occurring nano cellulose microfibril in the cellulosic material, so as to in situ obtain the nano cellulose microfibril reinforced polymer composite material. The nano microfibril can be observed under a transmission microscope obviously, which is different from the completely dissolved cellulose solution. In the preparing process, the dissolving temperature is controlled within 30-150 DEG C, and stirring and vacuum deaeration are used as auxiliary. By controlling the dissolving time, solution concentration and ratio of mixing, a polymer solution containing cellulose microfibril with dimension of 5-300 nanometers can be obtained. The polymer solution can be used for preparing composite material fiber, hollow fibrous membrane, diaphragm, film, gel, porous material and other known applications of enhanced material.

Embodiments of the present invention include hierarchically-dimensioned, microfiber-based dry adhesive materials featuring dense arrays of microfibers with free tips terminating in numerous microfibrils. In certain embodiments, more than two levels of microfiber-dimension hierarchy may be employed, each dimension involving smaller microfibrils emanating from the tips of the microfibers or microfibrils of the next highest dimensional level. Various additional embodiments of the present invention are directed to methods for preparing hierarchically-dimensioned, microfiber-based dry adhesive materials. These methods include single-pass or multi-pass imprint-lithography, pattern masking and etching, and imprinting fiber-embedded substrates followed by etching.

The present invention aims to provide cellulose-based fibrous materials for obtaining papers and sheets having low density, high surface quality, good size stability despite of high strength, and high opacity. Cellulose-based fibrous materials having external fibrils consisting of an assembly of scale-like microfibrils exhibit a higher fiber stiffness, a lower water retention value and a higher specific surface area as compared with fibrous materials having filamentous external fibrils at the same freeness. Papers and sheets having low density, high surface quality, good size stability and high opacity can be obtained by using such fibrous materials.

The present invention provides a polyolefin microporous membrane having a surface structure comprising fine spaces formed by partitioning micro-fibrils and a network formed by uniform dispersion of said micro-fibrils, wherein the average diameter of the micro-fibrils is 20 to 100 nm and the average distance between the micro-fibrils is 40 to 400 nm; and a process for producing said poly-olefin microporous membrane.

Environmentally degradable finely attenuated fibers produced by melt spinning a composition comprising destructurized starch, a biodegradable thermoplastic polymer, and a plasticizer are disclosed. The present invention is also directed to highly attenuated fibers containing thermoplastic polymer microfibrils which are formed within the starch matrix of the finely attenuated fiber. Nonwoven webs and disposable articles comprising the highly attenuated fibers are also disclosed.

Embodiments of the present invention include hierarchically-dimensioned, microfiber-based dry adhesive materials featuring dense arrays of microfibers with free tips terminating in numerous microfibrils. In certain embodiments, more than two levels of microfiber-dimension hierarchy may be employed, each dimension involving smaller microfibrils emanating from the tips of the microfibers or microfibrils of the next highest dimensional level. Various additional embodiments of the present invention are directed to methods for preparing hierarchically-dimensioned, microfiber-based dry adhesive materials. These methods include single-pass or multi-pass imprint-lithography, pattern masking and etching, and imprinting fiber-embedded substrates followed by etching.

By using a vulcanized rubber composition containing a rubber component composed of at least any one of a natural rubber, a modified natural rubber and a synthetic rubber, and chemically modified microfibril cellulose, it is possible to provide a vulcanized rubber composition that is environmentally conscious and that exhibits excellent rupture characteristics and a low energy loss, and a pneumatic tire that is excellent in rolling resistance property, steering stability and durability.

The present invention is directed to highly attenuated fibers produced by melt spinning a composition comprising destructurized starch, a thermoplastic polymer, and a plasticizer. The present invention is also directed to highly attenuated fibers containing microfibrils which are formed within the starch matrix. Nonwoven webs and disposable articles comprising the highly attenuated fibers are also disclosed.

The invention provides a surface sizing solution used in the papermaking field. The surface sizing solution contains a product and water, the product is obtained after a cross-linking reaction of nano fibrillated cellulose, starch and a cross-linking agent, the nano fibrillated cellulose is single microfibrils of cellulose having a length of 100-2000nm and a diameter of 3-200nm obtained through defibrating cellulose raw materials, wherein bone dry mass parts of the nano fibrillated cellulose, the starch and the cross-linking agent are 0.1-10, 85-99.75 and 0.15-5 respectively. The invention also provides a sized paper made by using the surface sizing solution. The surface sizing surface containing the nano fibrillated cellulose is coated on the surface of paper to realize enforcing and toughening effects in order to effectively improve the flexibility resistance of the sized paper.

The invention discloses a preparation method of nano-cellulose aerogel and relates to the preparation method of the nano-cellulose aerogel. The preparation method aims at solving the problem of poor dispersion of the existing cellulose aerogel in an organic solvent. The preparation method comprises the following steps: 1) dissolving absorbent cotton in a sulfuric acid solution for acidolysis, centrifugalizing, and then washing a white sol precipitate with deionized water to be neutral; 2) adding the nano-cellulose sol precipitate into the organic solvent, uniformly stirring, and then placing into an ultrasonic cleaning instrument for ultrasonic dispersion; and 3) placing a nano-cellulose suspension at the temperature of minus 18-minus 25 DEG C for freezing, and then further placing into a freeze-drying machine for freeze-drying. The nano-cellulose aerogel prepared by the invention has obvious nano-microfibril and nano-porous structure and can be rapidly dispersed in the organic solvent, such as dimethylformamide, dimethylacetamide and the like, the particle size of dispersed cellulose is nano-scale, and the good dispersion is shown. The preparation method disclosed by the invention can be applied to catalyst carriers, adsorbents and other fields.

A non-destructive method capable of real-time or on-line measurement of a wood or pulp fiber without sample pretreatment for the microfibril angle and the path difference. A circular polariscope in combination with a line spectral camera generating a micrograph insensitive to the orientation of a fiber and determined only by the fiber's properties related to polarized light. A line image across the fiber is captured and dispersed it into a spectral image to perform a real-time spectral analysis of the fiber's image.

A process for preparing the aramid fiber pulp features that the leftover of aramid fibre is physically treated to become microfibrils with large specific surface area. It can be used as friction material, sealing material and filler.

The sintered composite material contains microfibril oxide and micron level grains of catalyst, adsorbent, magnetic material, etc. and its oxide microfibrils have sintered combining points to form 3D netted structure to bind up the micron level grains. The preparation process of the sintered composite material includes: mixing microfibril, micron level grains, adhesive and water in certain proportion to form slurry; filtering in forming mold to form the precursor; drying the precursor and sintering at certain temperature and atmosphere to form the composite material. The composite material has the advantages of excellent anticorrosive performance, excellent antioxidant performance, controllable netted structure, high micron level grain supporting amount, easy production and low cost.

This invention provides a bacterial cellulose comprising ribbon-shaped microfibrils having a thickness of 10 to 100 nm and a width of 160 to 1000 nm or a bacterial cellulose comprising ribbon-shaped microfibrils having a thickness of 10 to 100 nm and a width of 50 to 70 nm. The former bacterial cellulose can be produced by culturing cellulose-producing bacteria in a culture medium containing a cell division inhibitor, and the latter can be produced by culturing the bacterium in a culture medium containing an organic reducing agent. The bacterial cellulose is modified from conventional bacterial cellulose in the major axis, and is improved in Young's modulus, etc.This invention provides a bacterial cellulose comprising ribbon-shaped microfibrils having a thickness of 1 to 9 nm and a width of 160 to 1000 nm or a bacterial cellulose comprising ribbon-shaped microfibrils having a thickness of 1 to 9 nm and a width of 50 to 70 nm. The former bacterial cellulose can be produced by culturing cellulose-producing bacteria in a culture medium containing a cell division inhibitor, and the latter can be produced by culturing the bacterium in a culture medium containing an organic reducing agent. The bacterial cellulose is modified from conventional bacterial cellulose in the major axis, and is improved in Young's modulus, etc. <?insert-end id="INS-S-00001" ?>

The invention discloses a nondestructive detection method of mechanical properties of standing timbers. The method comprises the following steps of: S1, establishing a prediction model Ecell of a longitudinal elastic modulus of a wood cell wall; S2, establishing a prediction model of a wood macroscopic longitudinal elastic tensile modulus E taking the air-dry density rho and a microfibril angle MFA of a mechanical sample as independent variables: E=a*( rho /rhocell) Ecell+b; S3, measuring the elastic tensile modulus of wood rift grains, the air-dry density and the MFA on the same one mechanical sample, putting the measured data into E and carrying out linear regression to obtain coefficients a and b, and completing the establishment of the wood macroscopic longitudinal elastic tensile modulus E; and S4, drilling the standing timbers to take a growth cone, detecting the air-dry density and the MFA of the growth cone from a pith to bark multipoint, and putting into the model E after the step S3 so as to obtain the predicted value and regularities of distribution of the longitudinal elastic modulus of the standing timbers. According to the nondestructive detection method, the nondestructive and accurate measurement to the mechanical properties of the standing timbers is realized.

A medical device intended for insertion into a living body, which includes a non-biodegradable substrate having a tissue contact surface, wherein said tissue contact surface is at least partially coated with microfibrils of collagen VI.