4results about How to "Reduce fuzz" patented technology

According to the present application, there are provided a quartz glass cloth constituted by a glass yarn having a high content of silicon dioxide (SiO2) and having less fuzz, and a prepreg and a printed circuit board, etc. containing the same. The glass cloth of the present application is constituted by a glass yarn containing a plurality of filaments as warp and weft, and the content of silicon (Si) of the glass yarn is 95.0 mass% or more and 100 mass% or less as converted into silicon dioxide (SiO2). The thickness (T) of the glass cloth is 80 μm or less, and satisfies {number of warp bundle segments (N) - 0.2} / thickness (T) [μm] < 0.056.

The utility model discloses an engineering seat anti-skid wear-resistant seat surface material, which comprises an anti-skid layer, an enhancement layer, a shock absorption layer and an absorption layer, the upper surface of the anti-skid layer is provided with a bionic shark layer structure, the shock absorption layer is internally provided with a plurality of elastic pieces, the shock absorption layer is internally filled with magnetorheological fluid, the absorption layer is internally provided with a silica gel honeycomb block, and the silica gel honeycomb block is filled with a plurality of elastic pieces. A reinforcing band is arranged in the absorbing layer, and the reinforcing band is filled with polyurethane foam. According to the device, the stability of the static friction coefficient is improved by arranging the bionic shark layer structure, the surface is durable and wear-resistant, scratches and fuzzing are reduced, and by means of hexagonal elastic deformation when the silica gel honeycomb block is pressed, the viscosity of magnetorheological fluid, damping vibration of polyurethane foam in the reinforcing band through a closed-cell structure, elastic deformation of an elastic piece and deformation of an air capsule, the stability of the static friction coefficient is improved. A multi-stage damping mechanism is formed to absorb vibration, local pressure can be dispersed to the whole absorption layer, and the excellent compression resilience performance is achieved.

The invention provides a polyacrylonitrile precursor, a carbon fiber and a preparation method thereof. The preparation method of the polyacrylonitrile precursor adopts wet spinning and comprises the steps of coagulating bath and hot water drafting, the hot water drafting at least comprises three times of hot water drafting, the swelling degree of the fiber after the second time of hot water drafting is 110-155%, and the total drafting multiplying power of the hot water drafting is 1.5-6.5 times. The modulus of the polyacrylonitrile precursor is 130 to 160 cN / dtex; the breaking strength of the polyacrylonitrile precursor is 5.80 cN / dtex to 6.50 cN / dtex; the average number of broken filaments per 10000 meters of the polyacrylonitrile precursor is not more than 15; the dispersion coefficient of the fineness of the polyacrylonitrile precursor is 3-5. The invention has the advantages of oil demulsification, less deterioration, high mechanical properties of the precursor, small fineness dispersion coefficient, and less broken filaments and broken filaments in a graphitization furnace.

The invention discloses a carbon fiber sizing agent and a preparation method and application thereof, particularly relates to the technical field of carbon fiber sizing agents, and is characterized in that the carbon fiber sizing agent is prepared from epoxy resin and auxiliaries, the epoxy resin is at least one of bisphenol A epoxy resin or phenolic aldehyde modified epoxy resin, and the auxiliaries are epoxy resin. The auxiliaries comprise a flexibilizer, a soaking agent, a softening agent, a moisture absorbent and an emulsifier, the flexibilizer is one or more of polyether polyol or hydroxyl-terminated polybutadiene, the soaking agent is a nonionic surfactant, the softening agent is one or more of fatty acid ester or fatty acid amide, and the moisture absorbent is one or more of polyisobutylene or polyisobutylene. The moisture absorbent is one or more of glycerol or sorbitol, the emulsifier is a nonionic surfactant, the concentration of the sizing agent is easy to control, the binding force between the sizing agent and the carbon fiber surface is strong, and the compatibility between the sizing agent and a resin matrix is good.