Application of rock wool in external thermal insulation system

With the shortage of energy, the state has formulated a number of policies and regulations on energy conservation and emission reduction, of which building energy conservation is a key energy conservation project.

Building energy consumption, industrial energy consumption and transportation energy consumption are the “three major energy consumers” in China's energy consumption. Generally, building energy consumption accounts for 30%, which refers to the proportion of energy consumption during the construction and use of buildings. If energy consumption in building materials production and building-related energy consumption are added, it will account for more than 45% of the total energy consumption. From this, it can be seen that building energy efficiency cannot be delayed. However, from the perspective of the current external wall insulation system, organic insulation materials still have many drawbacks. For example, major fire accidents caused by the easy burning of organic materials continue to occur, resulting in a large loss of life and property. In this regard, the Ministry of Public Security and the Ministry of Housing and Urban-Rural Development jointly issued the Civil Building Exterior Insulation System and the Temporary Provisions for Fire Protection of Exterior Wall Decorations on the 25th of September, 2009. The materials for the external wall insulation system. And the construction has put forward specific fire protection requirements. The insulation materials involved in the classification of the A-grade insulation materials are mainly rock wool, glass wool, vitrified microbead composite slurry, foamed cement and vacuum insulation board (VIP board).

1 Comparison of performance of several grade A insulation materials Rockwool has the advantages of low thermal conductivity, good gas permeability and high combustion performance. Its shortcomings are difficulty in fixed installation, inconsistent horizontal and vertical phase strength, and high water absorption. Foamed cement is a new type of lightweight insulation material containing a large number of closed pores. Because its raw materials are all non-combustible materials such as cement, it can also be used as A-grade insulation material, but the foaming water 2011-04-06 mud insulation Poor performance, high price, high density, and poor operability in implementing external insulation in existing buildings. Glass wool is an inorganic fiber with good forming, small bulk density, low thermal conductivity and stable chemical properties. The disadvantages are that it is easy to change, not resistant to extrusion, not resistant to water, easy to make people allergic, and fine powder is easy to enter the air. It floats in the wind and has not been applied in the external wall insulation system. The vitrified microbead composite slurry has low water absorption, high strength and high fire resistance temperature. The disadvantage is that the thermal conductivity is high, and it cannot meet the technical standard of 65% energy saving, and can only be used for screed or indoor insulation materials. Vacuum insulation board (VIP board) is a kind of vacuum insulation material, which can effectively avoid the heat transfer caused by air convection, can greatly reduce the thermal conductivity, and has the advantages of environmental protection, high efficiency and energy saving. However, there are still defects in the use of VIP panels for exterior wall insulation systems: because the butt joints of the panels cannot be eliminated, there will be a mesh-like thermal bridge on the wall, the insulation function of the whole system is almost lost, and because it cannot be cut on site, the construction difficulty Very high, the feasibility of using it for construction is theoretically small. The performance comparison of several Class A fire insulation materials is shown in Table 1. It can be seen from Table 1 that rock wool is the most suitable Class A non-combustible material for exterior wall insulation as long as it improves its shortcomings and exerts its advantages. However, the quality of rock wool products on the market is currently uneven. In order to standardize the design, construction and engineering acceptance of the outer wall insulation project of rock wool board, and to ensure the quality of the external wall insulation project, the Shandong Institute of Building Science and the relevant units are extensively surveyed and extensively On the basis of the experimental research, the application technical specification (DB/T14-0732010) for the external thermal insulation system of rock wool board external wall for engineering construction in Shandong Province was compiled. Taking this technical regulation as the standard, many rock wool produced from slag as raw materials cannot be used for exterior wall insulation. Only rock wool with various performance indicators can be applied.

Table 1 Comparison of performance of several Class A fireproof thermal insulation materials Rock wool glass wool vitrified microbead composite slurry foamed cement VIP board thermal conductivity /0.026~0.0450.03~0.044 at 0.070.06~0.28 at 0.005 high temperature Sex / 弋 600 ~ 750250 ~ 300500250 ~ 300500 flame retardant non-combustible class A non-combustible class A A2 class non-combustible class A non-combustible class A density / (kg.m-3) 100 ~ 25010 ~ 100 in 300300 ~ 600800 ~ 1 000 moisture absorption rate /% at 5 in 5 at 12<15 in 5 vertical plate surface tensile strength / MPa0.10.10.10.60.1 breathable breathable breathable breathable breathable breathable dimensional stability does not warp, does not crack, does not crack, does not crack 0.3% No warping or cracking Note: The above data varies with the products of each manufacturer.

2 The performance requirements of rock wool for exterior wall insulation system can be divided into three types: sedimentary rock wool, pendulum rock wool and three-dimensional rock wool according to the different production processes of rock wool. The compressive strength and interlayer bonding strength of the rock wool with settlement method are both poor and the water absorption rate is very high. The compressive strength and interlayer bonding strength of the pendulum rock wool are higher than that of the sedimentation rock wool, and the water absorption rate is also greatly reduced; The method rock wool is made by mechanically changing the distribution direction of the uncured rock wool layer formed by the pendulum method. The rock wool fiber has three-dimensional distribution, high compressive strength, not easy to delamination and peeling, and low water absorption rate. However, the price is high and it is not suitable for large-scale use. Taking into account the two factors of performance and price, the pendulum rock wool is selected as the insulation material for the outer wall. The performance requirements of rock wool board/belt are shown in Table 2. Table 2 Performance requirements of rock wool board/belt Test item performance index Test method Rock wool slate cotton belt right angle deviation / (mm.m-1) at 5 flatness deviation /mm in 6 procedures Appendix A acidity coefficient dimensional stability /% mass moisture absorption rate /% water absorption rate /% water absorption (partial immersion) procedures Appendix B long-term (if necessary) / (kg.m-2) thermal conductivity (average Temperature 25 )) / (Arbitration Test) Continued Table 2 Test Item Performance Index Test Method Rockwool Slate Cotton Belt Compressive Strength / kPa 40 Combustion Performance Grade 3 Rockwool in External Wall Insulation System 3.1 Rockwool Board Composite Leveling Slurry The structure of the external thermal insulation system is different according to the requirements of various engineering, and the structure of rock wool in the insulation of the external wall is also different. The composite slurry leveling construction process is cumbersome. After the hot-dip galvanized mesh is laid, the alkali-resistant glass fiber mesh is required to be laid, and the corresponding engineering cost is also high. However, the impact strength of the rock wool board of this structure is improved, and the composite is improved. The leveling of the slurry can release the internal stress of the whole system to a large extent, avoiding the possibility of cracking of the facing layer, so the facing layer can be either a facing mortar or an elastic coating.

Rock wool board composite leveling slurry external wall thermal insulation system structure anchor bolt rock wool board reinforcement net (single layer net) thin plaster exterior wall thermal insulation system structure adhesive agent interface agent TR10, TR15 rock wool board one interface punishment One layer of surface smashing compound one layer to the city glass fiber mesh cloth surface mortar + coating calcium silicate board diagram S rock wool in the integrated board as a fire barrier structure 3.2 rock wool board reinforcement network (double layer network) The second construction of the thin plastering exterior insulation system rock wool board in the exterior insulation system is the use of a reinforcement mesh. Compared with the structure of the composite slurry leveling, the construction cost is relatively low, the construction process is relatively simple, the quality requirement of the rock wool board is low, and the tensile strength of the vertical board surface can be used at 7.5 kPa. . The finish layer of this construction is recommended as a facing mortar and elastic coating, but it actually shows that the facing mortar is more suitable for this system, because the permeability of the rock wool insulation system is relatively high, if the veneer coating is relatively breathable Poor, the coating will appear bulging, falling off and so on.

Adhesive-interface agent-TR7.5 rock wool board-interface agent plastering compound composite double-layer alkali-resistant glass fiber mesh cloth clock surface sand 蝎 paint anchor rock wool board reinforcement net (double layer net) thin plaster External wall thermal insulation system structure 3.3 Rock wool board reinforcement net (single layer net) thin plastering exterior wall thermal insulation system structure Single-layer net exterior insulation system structure, basically similar to EPS board thin plastering system, but due to rock The impact strength of the cotton board is relatively low, and the tensile strength requirement of the board is increased in the construction, and must be greater than 10 kPa. This type of construction is not recommended for use in systems with common paint finishes. It is more suitable for use in systems such as glass curtain walls and dry-hanging marble, which can avoid the disadvantage of low impact strength of rock wool boards.

3.4 Rock wool board in the thermal insulation decorative integrated board external wall insulation system structure insulation decoration integrated board is a new type of insulation products on the market, due to its decorative effect, simple construction, anti-cracking of the facing layer, on-site garbage Less advantages, have been widely used in the market, insulation and decoration integration is the future development trend of external wall insulation. However, the insulation layer of the integrated board is basically organic materials such as EPS, XPS and PU. There are safety hazards in the fire prevention. If the new material of the integrated board is widely used in the market, how to carry out fireproof design and how to choose fireproof materials How to construct and install to ensure the integrity of the entire system is worth considering by the manufacturer. If the A-grade fireproof insulation material such as rock wool can be combined with the integrated board, the market prospect of the thermal insulation decorative integrated board will be better. There are two implementations of rock wool in the integrated board: one is that the insulation layer is all rock wool, and the other is the rock wool fire isolation belt. The rock wool used for the integrated board should adopt the vertical wire structure, that is, the fiber direction of the rock wool is perpendicular to the veneer; the rock wool used for the integrated board must use the backing plate to improve the overall strength of the rock wool.

Back village slate cotton slate wool in the integrated board as the insulation layer structure backing slate rock wool board EPS/XPS board calcium silicate board 4 Conclusion In all Class A fire insulation materials, rock wool in addition to thermal insulation properties Excellent in construction, good in ventilation and high in fire resistance. Its construction process is similar to EPS thin plastering system. It is easy to operate on site and there is no cold bridge in the whole system. At present, there are only a few rock wool manufacturers in China that are qualified in terms of low water absorption, high acidity coefficient and high tensile strength. Among them, our company's Sissil rock wool is one of them. It is hoped that more and more state-owned rock wool enterprises will grow and develop, providing good products for China's expanding rock wool market.

(Finish)

when customers want to cut thick thickness more than 20mm , and the budget & space is limited , Portable Flame Cutting Machine is more suitable.