31results about How to "Uniform glue content" patented technology

The invention belongs to the technical field of communication materials, and particularly relates to a flame-retardant polyarylether-based composition. Any one or both of a double-terminal hydroxyl type phosphorus-bromine-containing polyarylether oligomer and a multi-terminal hydroxyl type phosphorus-bromine-containing polyarylether oligomer are used as matrix resin, so that when only a small amount of flame retardant is used or even no flame retardant is used in the flame-retardant polyarylether composition, the prepared prepreg and copper-clad plate can also ensure the effects of sufficient overall performance and better flame retardant property.

The invention discloses a formula of polytetrafluoroethylene glass fiber breathable varnished cloth. The formula is characterized by consisting of the following components in percentage by mass: 30 to 40 percent of polytetrafluoroethylene, 0.5 to 0.8 percent of a surfactant and the balance of non-ionic water and alkali-free glass cloth of which the warp density and the weft density are 200 pieces per 10 centimeters (+/-10 percent), the thickness is 0.04 to 0.06mm and the breadth is 900 to 1,000mm. The polytetrafluoroethylene glass fiber breathable varnished cloth has the beneficial effects that by customization of a piece of glass fiber base cloth, the formula and the production technology are improved, so that the alkali-free glass cloth is uniformly coated with and immersed by polytetrafluoroethylene emulsion, and the formula is more reasonable; no bubbles are produced on the surface of the prepared polytetrafluoroethylene glass fiber breathable varnished cloth, and the glue content is uniform; the breathability is high, and the production cost is low; the polytetrafluoroethylene glass fiber breathable varnished cloth has high-temperature resistance and high intensity of a glass fiber fabric and also has a series of properties of high insulation performance, high viscosity prevention and the like of polytetrafluoroethylene.

The invention relates to a sampling method for mechanics performance testing of preoxidized fibers, which comprises the following steps of: 1) putting the preoxidized fibers to be tested on a releasing roller; 2) performing gum dipping on the preoxidized fibers passing through the releasing roller in a gum dipping tank; 3) allowing the preoxidized fibers subjected to gum dipping to pass through a compression roller; 4) fixing the preoxidized fibers passing through the compression roller and subjected to uniform gum dipping to a sample forming frame, wherein the sample forming frame can rotate at a uniform speed and is used for fixing the preoxidized fibers; and 5) drying the preoxidized fibers fixed to the sample forming frame. The method solves the technical problem that the conventional sampling method for mechanics performance testing of the preoxidized fibers cannot ensure the gum content of the preoxidized fibers to be tested so as to influence the mechanics performance of the fibers, and makes a tested sample dip gum more fully have the gum content more uniform; and gum beads influencing test results cannot be left on the sample.

The invention discloses an aerogel thermal insulation material and a preparation method thereof. The preparation method comprises the following steps that unwinding is conducted, specifically, a non-woven fabric is unwound and unfolded through an unwinding machine, and surface dust is removed; glue dipping is conducted, a glue solution is injected into a glue dipping pool of a glue dipping machine, the temperature of the glue solution is controlled to be 32-40 DEG C, the unfolded non-woven fabric is fed into the glue dipping machine, and the glue solution permeates into the non-woven fabric; vacuum suction drying is conducted, the non-woven fabric obtained after glue dipping is fed into a vacuum suction dryer, and redundant glue liquid in the non-woven fabric is sucked out in a negative pressure mode; rolling is conducted, and the non-woven fabric subjected to vacuum suction drying is extruded through opposite roll shafts of double-roll extrusion equipment; drying is conducted, and the rolled non-woven fabric is fed into a drying machine for drying; cooling is conducted, the dried non-woven fabric is guided into an air cooling machine to cool the two sides of the non-woven fabric, the aerogel thermal insulation material is formed, and the air speed of the air cooling machine is controlled to range from 1.2 m/s to 1.8 m/s. According to the aerogel thermal insulation material and the preparation method thereof, the process is simple, and the thermal insulation effect of the prepared thermal insulation material is improved.

The invention relates to a novel process flow for carrying out surface treatment on carbon fiber, aiming at realizing the purposes that burrs on the surface of produced carbon fiber are remarkably reduced, the mechanical property of the carbon fiber is enhanced and the energy source consumption is reduced. The technical scheme for realizing the purposes is as follows: the novel process flow for carrying out surface treatment on the carbon fiber comprises the following steps: surface electrolysis treatment; water washing; extrusion with a rubber roller; starching; drying; and rolling. The surface of the carbon fiber is treated by adopting a surface electrolysis treatment method; the treated carbon fiber is subjected to starching treatment to form a carbon fiber bundle; the starched carbon fiber bundle is subjected to drying treatment so as to size the carbon fiber bundle; and the dried carbon fiber is wounded into a bobbin shape by a fiber rolling machine and is then packaged for marketing and sales after rolling treatment. Compared with the carbon fiber produced by adopting the traditional surface treatment process, the carbon fiber produced by using the novel process flow disclosed by the invention has the advantages of short process flow, high production efficiency, remarkably-reduced burrs on the appearance, slightly-increased mechanical property index and reduced energy source consumption, and thereby the novel process flow for carrying out surface treatment on the carbon fiber is worthy of application and popularization.

The invention relates to a poly-polyphenyl modified fluorine-containing resin mixture and prepreg and a copper-clad plate prepared therefrom. Poly-polyphenyl is modified on the surfaces of inorganic filler and glass fiber fabric, so that dispersity of the inorganic filler in a fluorine-containing resin matrix, compatibility among the inorganic filler, the glass fiber cloth and fluorine-containingresin is improved, and interaction force among the inorganic filler, the fluorine-retaining resin, the glass fiber cloth and a copper foil is enhanced. Further, a high-frequency copper-clad plate madeby using the prepreg, a film and the copper foil is good in thermal-mechanical performance, excellent in dielectric performance, high in comprehensive performance stability, excellent in uniformity,especially high in striping strength of the copper foil and capable of meeting various comprehensive performance requirements of the high-frequency communication field on a substrate material.

The invention belongs to the technical field of communication materials, and particularly relates to a fluorine-containing resin-based high-thermal-conductivity high-frequency copper-clad plate with a high dielectric constant. The fluorine-containing resin-based high-thermal-conductivity high-frequency copper-clad plate is prepared in the mode that fluorine-containing resin mixture uniform dispersion liquid is prepared at first, then fluorine-containing resin-based composite paste is prepared, then a fluorine-containing resin-based dielectric sheet is prepared through blade coating, drying and sintering, and finally the fluorine-containing resin-based dielectric sheet and a copper foil are overlapped to prepare the final fluorine-containing resin-based high-thermal-conductivity high-frequency copper-clad plate.

The invention provides a high-speed and high-precision single-bundle fiber impregnation machine which comprises an impregnation wheel set, a first scraper and a second scraper. A plurality of yarn guide grooves are concavely formed in the surface of an impregnation idler wheel, the yarn guide grooves in the lower edge of the impregnation idler wheel are soaked in resin liquid of a resin tank, thefirst scraper is arranged between the impregnation roller and a front guide wheel, the first scraper is provided with a scraper plane, the scraper plane is used for scraping a large amount of resin liquid adhered to the surface of the impregnation idler wheel, the second scraper is arranged between the impregnation idler wheel and the front guide wheel, the second scraper is far away from the resin tank relative to the first scraper, the second scraper is provided with a scraper edge, a plurality of convex parts are convexly arranged on the edge of the scraper, the second scraper is inserted into the yarn guide grooves of the impregnation idler wheel through the convex parts, and the convex parts are used for controlling the resin amounts of the yarn guide grooves with high precision.