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

The invention relates to a fluororesin mixture, a copper-clad plate prepared therefrom and a manufacturing method thereof. The fluororesin mixture contains the following two substances as necessary components in 100 parts by weight of an organic solid substance: 90-99 parts of polytetrafluoroethylene (PTFE) emulsions and 1-10 parts of polytetrafluoroethylene perfluoroalkyl vinyl ether (PFA) emulsions. The copper-clad plate prepared from the fluororesin mixture comprises a plurality of superimposed varnished cloths and copper foil coating one or two surfaces of the varnished cloths, and each varnished cloth comprises a glass fiber cloth and the fluororesin mixture attached to the dipped and dried glass fiber cloth. The fluororesin mixture is prepared by using the PTFE emulsions as main resins and can dip the glass fiber cloths many times under the condition that the PTFE sintering temperature is330 DEG C to prepare the vanished cloths, and the vanished cloths prepared from the fluororesin mixture has the advantages of good gum dipping quality, level surface, flexibility and easy operation; and besides, the copper-clad plate made from the fluororesin mixture has excellent dielectricperformance which meets the dielectric performance requirement of the high-frequency communication field for a base plate material, and has simple making method and process and is beneficial to industrial continuous production.

The invention discloses a fiber spreading device which comprises a machine frame, a gum dipping roller, a gum extruding device and a yarn evening mechanism. The gum dipping roller is connected with a machine frame bearing and driven by a motor to rotate. The gum extruding device is composed of three gum extruding rollers, the front gum extruding roller can achieve wrap angle adjustment of fiber bundles on the gum dipping roller by adjusting the vertical position of the gum extruding device, the two rear gum extruding rollers can adjust the thickness of gum on the fiber bundles and can meanwhile provide pressing force for evenly spreading the fiber bundles, a gap between the two rear gum extruding rollers can be adjusted through a gap adjusting mechanism, and the size of the gap can be read through a gap measuring mechanism. A spring adjusting portion can automatically adjust the gap between the two rear gum extruding rollers. The yarn evening mechanism comprises a yarn evening roller and a yarn evening sleeve, wherein the yarn evening sleeve sleeves a yarn evening barrel, and a groove is formed in the yarn evening sleeve. When fibers pass through the groove, the tension of the fibers can force the fibers to evenly spread to the two sides of the groove. The fiber spreading device has the advantages of effectively controlling the spreading width of the prepreg fibers and controlling the thickness of the fibers dipped in gum.

The invention relates to a polyphenol-modified fluorine-containing resin mixture and a prepreg and a copper-clad laminate prepared therefrom. The present invention modifies the surface of the inorganic filler and the glass fiber cloth with polyphenol, so as to promote the dispersion of the inorganic filler in the fluorine-containing resin matrix, improve the compatibility between the inorganic filler, the glass fiber cloth and the fluorine-containing resin, and further Enhance the interaction between inorganic filler, fluorine-containing resin, glass fiber cloth and copper foil. Further, the high-frequency copper-clad laminate made of the prepreg, film and copper foil has good thermal-mechanical properties, excellent dielectric properties, good overall performance stability, and good uniformity, especially the peel strength of the copper foil is very high, It can meet the comprehensive performance requirements of substrate materials in the high-frequency communication field.

The invention belongs to the field of communication materials, in particular to a polydopamine (PDA) modified hydrocarbon composition-based prepreg and a copper clad plate prepared by using the same.A Hydrocarbon composition with excellent dielectric properties is constructed by using hydroxyl-terminated, amino-terminated or mercapto-terminated modified polyaryl ether or polyolefin resin as matrix resin and epoxy resin as a main curing agent. In the present invention, the prepreg made by impregnating a dispersing solution of the hydrocarbon composition with a reinforcing material and then baking and drying has uniform adhesive content, good impregnation quality, strong resin adhesion, smooth surface, good toughness and appropriate viscosity. Furthermore, the high-frequency copper clad plate made of the prepreg and copper foil has good thermal and mechanical properties, excellent dielectric properties, good comprehensive performance stability, good uniformity and high copper foil peeling strength, which can meet the comprehensive performance requirements of substrate materials in the field of high frequency and high speed communications.

The invention relates to a sample preparation method for testing the mechanical property of a carbon fiber, which comprises the following steps of: 1) placing the carbon fiber to be tested on a silk discharging roller; 2) gumming the carbon fiber passing through the silk discharging roller in a gumming slot; 3) ensuring that the gummed carbon fiber passes through a compression roller; 4) fixing the carbon fiber which passes through the compression roller and is gummed uniformly on a sample forming shelf, wherein the sample forming shelf can rotate at a constant speed for fixing the carbon fiber; and 5) drying the carbon fiber fixed on the sample forming shelf. The method solves the technical problems that the gel content of the carbon fiber to be tested cannot be ensured, and the mechanical property of the carbon fiber is influenced in the conventional sample preparation method for testing the mechanical property of the carbon fiber. By the method, gumming of a test sample is fuller, the gel content is more uniform, and gel breads which influence a test result do not exist on the sample.

The invention discloses a fluorine-substituted vinyl polymer resin composition and a prepreg and a laminate made therefrom. The fluorine-substituted vinyl polymer resin composition comprises a fluorine-substituted vinyl polymer resin and a functionalized polymer, wherein , the fluorine-substituted vinyl polymer resin is represented by the following formula, and its maximum particle size does not exceed 100 microns, the substituent R 1 , R 2 , R 3 , R 4 At least one of them is a fluorine atom, and the number n of repeating units is not less than 100. The preparation and modulation method of the composition in the present invention is simple, and the composition can be applied to electronic equipment, which greatly improves the signal transmission speed and reduces signal loss; the prepreg has uniform glue content, smooth surface, and stable performance; the laminated board has a simple manufacturing process and has excellent Mechanical, heat resistance and dielectric properties.