A kind of high-strength and low thermal conductivity superfine glass fiber cotton dry-process hot-pressed core material and its preparation method

Abstract

The invention relates to a high-strength low-heat conductivity coefficient ultra-fine glass fibre cotton dry hot-pressed core material and a preparation method thereof, and belongs to the technical field of glass fibres. The ultra-fine glass fibre cotton dry hot-pressed core material is prepared from the following components in percentage by weight: 62.5 to 65.5 percent of SiO2, 8.5 to 12.5 percent of R2O, 5.5 to 8.5 percent of B2O3, 4 to 7.5 percent of CaO, 2.8 to 5.2 percent of Al2O3, 1.8 to 4.2 percent of MgO and less than 0.38 percent of Fe2O3+ZnO+BaO, wherein the R in R2O is Na or K; thecore material has the advantages of low heat conductivity coefficient, and high tensile and bending strength. The preparation method of the high-strength low-heat conductivity coefficient ultra-fine glass fibre cotton dry hot-pressed core material specifically comprises six processes of forming fibres, collecting cotton, rolling, paving the cotton, performing hot-pressing and cutting; continuous dynamic hot pressing is adopted in a core material production process; the preparation method has the advantages of high production efficiency, high yield, low production cost and the like.

Description

technical field [0001] The invention belongs to the technical field of glass fibers, and in particular relates to a high-strength, low-thermal-conductivity superfine glass fiber cotton dry-process hot-pressed core material and a preparation method thereof. Background technique [0002] Vacuum insulation panel (Vacuum Insulation Panel: VIP) is a new generation of high-efficiency thermal insulation material composed of three parts: core material, membrane material and dry suction auxiliary material. As the core component of VIP, the core material has long been prepared by wet forming, including a series of preparation processes such as fiber beating, netting, dehydration and drying. The whole technological process is complicated, and the output is low, and the production cost is too high. As the supporting body of the vacuum insulation panel, the core material should have the characteristics of low thermal conductivity and high porosity, but the wet forming preparation proces...

AI Technical Summary

Problems solved by technology

[0004] The patents whose publication numbers are CN104370450A and CN103542234A disclose a method for preparing a superfine centrifugal glass fiber dry-process core material and a dry-process ultrafine glass wool vacuum insulation panel core material and its preparation method. The centrifugal cotton production line is directly connected to the hot-pressing equipment, and at the same time, the batch-by-batch static hot-pressing method is adopted. In actual production, there is a problem of matching the speed of the production line, which cannot be actually operated;