Impregnation method and impregnation device of reinforced material

Abstract

The invention relates to the technical field of preparation of prepreg for copper-clad laminates, particularly to an impregnation method of a reinforced material. The impregnation method comprises the steps of pre-impregnation and main impregnation, wherein secondary impregnation is arranged between the pre-impregnation and the main impregnation; the secondary impregnation comprises the steps of introducing the reinforced material subjected to the pre-impregnation into a sealed secondary impregnation tank through a first rolling device, and taking the reinforced material subjected to secondary impregnation out of the secondary impregnation tank through a second rolling device, so as to perform the main impregnation; and flowing resin glue is arranged in the secondary impregnation tank, so as to achieve secondary impregnation for the reinforced material. The impregnation method is aimed at impregnating the reinforced material through the resin glue with filler, and the secondary impregnation is carried out on the reinforced material, so that the continuous impregnation of the resin glue for the reinforced material from the pre-impregnation process to the main impregnation process is achieved, the resin glue with filler is prevented from hardening on the surface layer of the reinforced material, the bubbles in the reinforced material are decreased, the impregnation capacity of the reinforced material is improved, and the performance of manufactured bonding sheets is improved; and the invention further relates to an impregnation device of the method.

Description

technical field [0001] The invention relates to the technical field of preparation of prepregs for copper clad laminates, in particular to an infiltration method and an infiltration device for reinforcing materials. Background technique [0002] Adhesive sheet, also known as prepreg, is an indispensable semi-finished product for the production of copper clad laminates and multilayer printed circuit boards. It is mainly composed of reinforcing materials, such as glass fiber, non-woven fabrics or wood pulp paper, etc. It is formed by soaking and drying. The resin of the prepreg can be re-melted and bonded and completely cured at high temperature. Therefore, different types of prepregs can be laminated. After high-temperature hot pressing by a laminator, a copper-clad laminate or multi-layer printing that meets the requirements can be formed. Line laminate. [0003] When the existing reinforcing materials are infiltrated with resin glue to form a bonded sheet, two or more infi...

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Problems solved by technology

[0004] However, with the trend of more fillers and the use of large molecular weight resins in the resin glue, the "breathing section" function of using the original single resin itself to release bubbles has highlighted its disadvantages; such as: making copper-clad laminates (Copper-cladLaminate, CCL for short), after the reinforcement material passes through the pre-impregnation stage, in the "breathing section", the solvent in the resin glue on the surface of the reinforcement material will evaporate quickly, increasing the viscosity of the resin glue, plus the inside of the resin glue Fillers and large molecular weight molecules prevent the rapid release of air bubbles inside the reinforced material, and the surface layer of the resin glue with large molecular weight will quickly "soften" to form a dense film, thereby preventing the bubbles inside the reinforced material from overflowing. It also leads to the poor wetting ability of the glue during the main dipping; even after entering the main dipping, the air bubbles still remain inside the reinforcing material; when it is subsequently baked by the glue machine, the air bubbles inside the reinforcing material will gradually and slowly release to the reinforcing material. On the surface of the material, bubbles are formed on the surface of the bonded sheet, which affects the appearance of the bonded sheet, and also affects the appearance and functional properties of the subsequent sheet

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