The melting curve of the glass is as shown.
as shown in Table 3.
3 Results Analysis and Discussion 3.1 Physical and chemical properties of foam glass The physical and chemical properties of foam glass samples and two commonly used thermal insulation materials are shown in Table 43.2. Foam glass is added with appropriate amount of foaming agent and glass powder. The admixture, heated and melted, is formed by a series of physical and chemical changes. This process of change is a process of dynamic equilibrium between the gas phase, the liquid phase and the solid phase. When the foam glass batch is heated to about 600 ° C, the glass powder begins to stick to form a cavity, at which time the blowing agent is enclosed in the cavity, further heating up, the foaming agent begins to decompose and generate gas, and softens The viscous glass begins to swell under the action of the gas discharged from the blowing agent due to the surface tension. The foaming process is continued for a strictly specified period of time, after which the temperature is rapidly lowered, at which time the viscosity of the glass rises sharply, the cells begin to form, and finally settle in a stable form. Therefore, in the foaming process, all of the materials become a highly viscous plastic system in which the foaming agent is uniformly distributed, and a stable, uniform foam glass is formed due to the decomposition of the gas by the foaming agent.
It is found from Table 2 that the content of cullet in the sample is sequentially increased. From the foaming condition of the sample of Table 3, the foam glass made of the sample 3 is preferable. In combination with Tables 2 and 3, the foaming condition first becomes better with the increase of broken glass (sample 3 is the best). As the cullet continues to increase (sample 4), the foaming condition deteriorates, and sample 4 is inferior to sample 3. It can be known that the foaming of Sample 3 is the best.
According to the composition of the foam glass of Table 2, the content of cullet in sample 3 reached 75.7%. It increased by 0.7% compared with 75% reported in the relevant data. 4 Conclusion 4.1 Using waste flat glass as the base material, carbon black is foaming The agent, adding appropriate amount of flux and foam stabilizer, using a reasonable firing system, can prepare foam glass samples with small bulk density, low thermal conductivity and high compressive strength.
4.2 The suitable process parameters for this experiment are: the amount of waste glass is 75.7%, the carbon black is added to 9.80%, the proper amount of flux and foam stabilizer, the preheating heating rate is 5C/min, and the rapid heating rate is 10C/min. Foaming temperature is 800C Foaming time is 4.3 Foam glass has sound insulation effect, belonging to high-tech products, the raw materials used are discarded broken glass, the products produced have significant energy saving and environmental protection benefits, in line with the national industrial policy, belonging to the state The industries promoted and developed have broad market prospects.
(Finish)
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