A method for manufacturing high-performance bleached impregnated flame-retardant insulating paper

Abstract

The invention discloses a method for making high-performance bleached impregnated flame-retardant insulating paper. The method is used for making the bleached insulating paper through paper making technology with bleached paper pulp as the base material, and comprises the following steps: adding starch, a wet strength agent and sodium carboxymethyl cellulose in the pulp; performing sizing, squeezing and drying in insulating paper pulp; impregnating the insulating paper in a mixture impregnation liquid for 10-120 seconds, extruding, squeezing and drying, wherein the mixture impregnation liquid is prepared by mixing a flame retardant solution, a modified starch solution and a sodium carboxymethyl cellulose to the homogeneous state under the condition of room temperature. The bleached impregnated flame-retardant insulating obtained according to the method contains no halogen elements, is low-carbon and environmentally friendly, and has excellent breakdown voltage and dielectric strength; and the flame retardant level of the insulating paper is V0, the paper white degree is not less than 80 percent, the dry tensile strength is 3.0-4.2 KN / m, the wet tensile strength is 0.30-0.65 KN / m, and the volume resistivity is (0.8-1.2)*10<6>.

Description

Technical field [0001] The invention relates to a high-performance impregnated bleached insulating paper product, in particular to a method for manufacturing a new type of insulating paper product with ultra-high insulation performance composed of nearly 100% vegetable pulp fibers. The ultra-high performance new type of insulating aramid material can In the field of electronic and electrical insulation, such as PCB copper clad laminates, transformers, electrodes, ships, missiles and other military and civilian applications. Background technique [0002] With the rapid development of electronic technology, copper clad laminates have been widely used, especially environmentally friendly paper-based copper clad laminates made of environmentally friendly paper as the base material, which is in line with the current environmental and low-carbon development direction of electronic products. Bleached impregnated insulating paper is a special substrate for the insulating layer of copper-...

AI Technical Summary

Problems solved by technology

This form of flame retardant treatment may cause two adverse consequences: (1) Compatibility of flame retardants and solvents; considering the narrow range of flame retardants compatible with solvents, most of them are halogen-containing and non-environmentally friendly flame retardants (2) Due to the high viscosity and permeability of the solvent, the loading efficiency of the flame retardant on the insulating paper is low, resulting in the need to add a high content of flame retardant and solvent to make the product reach Anticipated strength and flame retardancy requirements, thereby increasing the production cost of the end product

There are few enterprises producing impregnated and bleached insulating paper in my country, and the relevant performance indicators and technical level are still far behind those of developed countries such as Japan, Europe and the United States. Some key technologies are still monopolized by foreign companies, because of their high price, hindering The healthy development of my country's related bleached impregnated insulating paper and environmentally friendly paper-based copper-clad laminate industries

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