Method for preparing borosilicate foam glass

Abstract

The invention relates to a method for preparing borosilicate foam glass, comprising the following steps: glass raw materials, foaming agent and blowing promoter are finely ground and evenly mixed to form batch mixture; the batch mixture is placed in a heat resistant mould; the batch mixture is prepared into multiaperture glass materials after the processes of preheating, sintering, frothing, annealing and the like; the method is characterized in that the chemical composition(wt%) of the glass materials is: SiO2: 55-78, B2O3: 0.5-25, Al2O3: 2-8, Li2O: 0.1-0.5, Na2O: 5-14, K2O: 0.5-6.5, MgO: 1-5, CaO: 3-8, BaO: 0-3, TiO2: 0.5-4, SO3: 0.02-0.45, Fe2O3: 0.2-1.0, MnO2: 0-2.5. the glass material belongs to the system of borosilicate glass and can be prepared into foam glass product featuring good acid fastness, good thermal shock stability, high mechanical strength, good scour resistance, low heat conducting coefficient and even aerated structure by adopting carbon blowing agents(carbon black, graphite, carborundum) and blowing promoter material.

Description

technical field [0001] The invention relates to a method for preparing borosilicate foam glass. The product adopts a borosilicate glass raw material and an appropriate amount of foaming agent and foaming aid to obtain foam glass with excellent performance under a suitable temperature system. The foam Glass has high chemical stability, especially acid resistance and good mechanical strength. It can be used as foam glass raw material to produce good acid resistance, good thermal shock stability, high mechanical strength, good erosion resistance, low thermal conductivity and uniform pore structure. foam glass products. Background technique [0002] Foam glass is made of quantitative glass raw materials, foaming agent and foaming aids, etc., which are finely pulverized and mixed uniformly to form batch materials, which are put into heat-resistant steel molds, and then preheated, sintered, foamed, and annealed. Made of porous glass material. Foam glass is composed of a large nu...

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Problems solved by technology

However, the composition system of these glasses mainly belongs to the soda-lime glass system. For the foam glass used for heat preservation, it is expected that the bubble structure is a closed-cell structure, which reduces and reduces the water absorption rate of the foam glass and improves the thermal insulation performance of the foam glass. However, this type of foam glass Common defects: First, the acid corrosion resistance is poor. Under the condition of 40% sulfuric acid corrosion, the weight loss of acid corrosion resistance is greater than 0.5g / 100 within 10 days 2 ; Second, the mechanical strength is low, the Vickers hardness is less than 500MPa, and the flexural strength is less than 0.6Mpa; the third is that the apparent bubble uniformity of the manufactured foam glass is not good. 2 There are more than 3 bubbles exceeding 100% of the average diameter, and it is difficult to obtain a closed-cell structural foam glass with a uniform appearance

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