How to deepen / optimize the design of exterior wall thermal insulation coating project? The design process is here! Taobao platform announced
Acidity coefficient is an important comprehensive parameter to characterize the high temperature viscosity, fiber forming performance, fusibility and water resistance of mineral wool melt.
The definition of acidity coefficient is: MK = (SiO2 + Al2O3) ÷ (CaO + MgO)
The symbol of each oxide represents the mass percentage of each oxide in the composition.
In general, the acidity coefficient of slag cotton is about 1.1 ~ 1.4, and that of rock wool is about 1.4 ~ 2.0.
Generally, rock wool products with acidity coefficient greater than 1.6.
Due to the different chemical composition of raw materials for producing rock wool board and mineral wool board, the acidity coefficients of rock wool board and mineral wool board are also different.
The acidity coefficient MK of rock wool is generally greater than or equal to 1.6, or even more than 2.0; the MK of slag wool can only be kept at about 1.2, which is difficult to exceed 1.3, because the content of silica and alumina in rock wool is high, while the content of mineral wool is low. In order to further improve the acidity coefficient of slag cotton, it is necessary to increase the content of SiO2 and Al2O3 in the melt, so that the content of Cao and MgO will be reduced correspondingly. In the case of low iron content, it is bound to increase the viscosity of the melt, so that it is difficult to guarantee the quality of slag cotton fiber. When MK = 1.2 or so, there is a wide and stable viscosity range under the optimal fiber forming temperature for the melt with low iron oxide content. In this case, even if the flow stream temperature fluctuates up and down by 100 ℃, the fiber quality and fiber forming rate will not be greatly affected. However, with the increase of acidity coefficient, the stability of melt becomes worse, and the sensitivity to temperature change also increases. As long as the temperature fluctuates slightly, its viscosity will change greatly, and even it can not be made into fiber. This is the reason why the acidity coefficient of slag cotton is generally around 1.2, and it is impossible to reach above 1.6 as the acidity coefficient of rock wool.
Because of this, the production cost of rock wool is high, the difficulty is great, the chemical property is stable and its price is relatively higher than that of mineral wool board.
Conclusion:
Rock wool board, high cost, high price, strong weather resistance, acidity coefficient ≥ 1.6, strong water resistance.
Mineral wool board (slag cotton), low cost, low price, weak weather resistance, acidity coefficient less than or equal to 1.3, relatively poor water resistance.
With the continuous development and progress of social economy, architecture is more and more seeking for external beauty, which needs complex exterior wall decoration to reflect, and the deepening of exterior wall decorative line coating is more and more essential. The deepened exterior wall drawings can greatly improve the convenience and accuracy of budget and construction. If you need to deepen, please scan the QR code below and contact the studio engineer wechat.
How to deepen / optimize the design of exterior wall thermal insulation coating project? The design process is here! Taobao platform announced
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How to deepen / optimize the design of exterior wall thermal insulation coating project? The design process is here! Taobao platform announced
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