Epsxps system of the hottest rubber powder polysty

2022-08-08
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Performance comparison between rubber powder polystyrene particle and benzene board system (eps/xps)

at present, the external insulation systems of building exterior walls mainly include: expanded polystyrene board (EPS) and extruded polystyrene board (XPS) thin plastering external insulation system, rubber powder EPS particle thermal insulation slurry external insulation system. This paper attempts to make an introduction to rubber powder polystyrene particle system and benzene board thin plastering system (eps/xps) through comparative analysis

1. Thermal insulation performance

the thermal insulation performance of rubber powder polystyrene particles, EPS and XPS with the same thickness is gradually increased. The thermal conductivity of rubber powder polystyrene particles is 0.060, EPS is 0.041, and XPS is 0.030. Because the thickness of exterior wall decoration meets the performance indicators such as thermal insulation, the thinner the better. Therefore, for the three methods with the same thermal insulation effect, the thickness of rubber powder polystyrene particles should be large. EPS and XP ring stiffness testing machines fully comply with the requirements of gb21238 (2) 007 glass fiber reinforced plastic sanding pipe gb/t9647 (2) 003 determination of ring stiffness of thermoplastic pipes. There is also this difference between s plates. The price of benzene board XPS board is more expensive than EPS board. The same benzene board has different mechanical properties and fire resistance levels, and the price is different. Taking XPS as an example, it is divided into ordinary boards, B1 and B2. Therefore, the environmental experimental equipment must have the characteristics of safe operation, convenient operation, reliable use, long service life and so on. Ordinary board is recommended to be used in basements or roofs. Class B2 is flame-retardant board, which can be used for external insulation of exterior walls, and Class B1 is flame-retardant board, which can be used for internal insulation of buildings

for thermal insulation, it mainly depends on the thermal inertia index D, and the value of D is directly proportional to the heat storage coefficient. In terms of heat storage capacity, rubber powder polystyrene particle system is larger than EPS and XPS. However, as far as the whole system is concerned, the heat storage of 200mm concrete is large enough, plus the external insulation layer, which fully meets the energy-saving requirements. This is also the reason why the national specification requires that the wall comprehensive mechanics experimental machine is a product combining modern electronic skills and mechanical transmission skills, and the thermal conductivity and thermal storage coefficient should meet the requirements at the same time. The current rubber powder polystyrene particles, EPS or XPS thin plastering systems fully meet the requirements

thermal insulation materials can slowly transfer heat in or out, but the greater the heat storage capacity, the more heat the material absorbs, that is, less heat will be transferred in or out. The heat storage capacity of concrete is large, but the heat transfer speed is also large. What is really suitable for Southern materials is materials with both thermal insulation and heat preservation. The polystyrene particle system is better than the polystyrene board system in this regard

however, if the heat storage of the wall is too large, more heat is needed to heat the wall. If the use interval of the room is long, such as we turn on the heating at 19 o'clock and turn it off at 23 o'clock when we come home from work in winter, the initial heat is used to heat the wall because of the excessive heat storage of the wall. Then the time to turn on the air conditioner must be extended to make the temperature in the room comfortable

in addition, for the rubber powder polystyrene particle system, the polystyrene particles that play the role of heat preservation are not continuously arranged, so the heat preservation surface of the heat preservation mortar is not continuous. Simply put, where there are polystyrene particles, there is heat preservation, where there are no particles, there is no heat preservation, or that place is cold bridge. So on the whole, there are cold bridges everywhere on the insulation surface of rubber powder polystyrene particles. In addition, the thermal insulation mortar is mixed with powder at the construction site, so it is more elastic during construction. Its construction quality is easy to fluctuate

2. Strength:

the strength referred to here is mainly tensile strength. There is a corresponding relationship between the unit weight and tensile strength of polystyrene board. Generally, the tensile strength of EPS unit weight 18kg/m3 is 110 ~ 120kPa, and that of 20kg/m3 is about 140kpa. The unit weight of XPS is normally from 25kg to 45kg, and the strength is from 150kPa to 700KPA or higher

among the three systems, the strength of rubber powder polystyrene particles is undoubtedly the best. Rubber powder polystyrene particles are made of rubber powder and polystyrene particle lightweight aggregate mixed with water. Its strength has obvious advantages over the sticking method of EPS and XPS systems

3. Flexibility

flexibility is an important property of materials. Taking plaster as an example, from the perspective of test parameters, JG158 (thermal insulation mortar line standard) and jg149 (thin plaster line standard) both set the index that the compression ratio is less than 3. Usually, plaster the plaster mortar on the polystyrene board in batches, and then see to what extent the polystyrene board is bent, and the plaster does not appear cracks, which is similar to the ductility index in waterproof materials. As for the thermal insulation material itself, the flexibility of EPS system is better than XPS, both of which are better than rubber powder polystyrene particles

4. Weatherability:

weatherability refers to the adaptability of the insulation system to external weather changes, and refers to a series of quality related problems such as the overall stability of the system and whether the insulation effect changes under different climatic conditions. Because most of the damage of the insulation system is durability damage, weather resistance is a very important index of the insulation system.) For the three systems, JG158 (thermal insulation mortar line mark) and jg149 (thin plaster line mark) have a mandatory clause - the weather resistance test must be passed. The weather resistance of the insulation system has a lot to do with moisture. The water absorption of rubber powder polystyrene particles is very high compared with EPS and XPS, so the water absorption is very high, but the external plaster layer in the system should be waterproof, so the weather resistance meets the requirements. In addition, because EPS board has higher water absorption compared with XPS, its weather resistance is not as good as XPS system. However, the ductility of EPS board is better than that of XPS board, which can overcome certain defects. However, as far as the system is concerned, the plaster glue on the outer layer of the thin plastering system also has a certain waterproof ability. In addition to the construction process, the waterproof performance of the three intact systems is OK. The contact between rainwater and the wall surface on the outer wall is vertical. As long as the surface mortar does not crack, there is no problem with waterproof

in the control of weather resistance, the service life of the general insulation system is 25 years, but in the existing insulation projects abroad, the longest service life has reached 40 years. At present, few enterprises in China are willing to provide 25 year quality assurance

5. Permeability:

permeability and water absorption are two problems of the same material. The size of air molecules and water molecules is very different. There is often a saying that they are breathable and impermeable, and there is an experimental basis

in the current insulation system, the permeability, thermal conductivity and waterproof performance of insulation products are a pair of contradictions. Moreover, the air permeability should be differentiated between the air permeability after wet water during the construction process and the air permeability after the completion of the system, with a market value of $33.33 billion by 2022. Rubber powder polystyrene particles plus anti cracking waterproof layer are only waterproof, and water vapor can penetrate

as far as the material itself is concerned, the permeability of rubber powder polystyrene particles is better than EPS, both better than XPS. Someone calculated that the air permeability of insulation slurry is 24 times that of EPS board. However, it is impossible for indoor steam to pass through the outer wall well, so there is no need to emphasize this point. Although XPS is not as breathable as EPS, But for rubber powder, polystyrene particles and EPS board "It can isolate rainwater and make the moisture in the wall pass through, which effectively solves the problem of air permeability of the building. However, XPS has almost no air permeability, and it is easy for moisture to condense on both sides of the board in areas with large indoor and outdoor temperature differences.

the problem of moisture accumulation in the insulation layer often occurs on both sides of the polystyrene board. If there are cracks in the polystyrene particle system, it will undoubtedly also appear in the insulation mortar Therefore, it is important to guide moisture and avoid cracks in the system

6. Bonding strength:

for the rubber powder polystyrene particle system, it belongs to the thermal insulation slurry applied directly to the wall surface, belongs to the overall plastering system and has no cavity. In addition, the thermal insulation layer of the system is made of rubber powder and polystyrene particles after mixing. Therefore, if the product quality is qualified and it is a product tested by the state, the bonding strength of the system is very high

xps is difficult to ensure the flatness of the external wall, and the crack resistant mortar outside is difficult to cover the slab joints, especially in the arc section. If XPS is a coating for wall insulation and finishing layer, the material determines the uneven surface (coating finish). The shadow of the board and the anchor is obvious in the sun. Therefore, extruded boards are not suitable for wall insulation boards with paint as the external facing. If it is ceramic tile facing, the problem is covered up by ceramic tile glue. The construction process of extruded board as wall surface is to roughen all the wrenches, paste them with glue after brushing the interface agent, and then rivet the fasteners for reinforcement after drying, roughen the surface of the extruded board, and brush the interface agent to ensure the bonding strength. The flatness of the wall is difficult to control, which causes problems for the paint decorative surface. EPS system is relatively much better, because the nature of the board is relatively soft, so it is better than XPS board in ensuring the flatness of the wall

the colloidal polystyrene particle system belongs to the overall plastering system, so as long as the plastering is smooth in the construction operation, there will be no such problems

7. Construction

insulation mortar is characterized by simple construction operation. The thermal conductivity of thermal insulation mortar is 0.06, XPS is 0.03, EPS is 0.04, and 50% of energy is saved in material selection. It needs to be 60mm and constructed in layers. According to the plastering process, such a thick thickness requires a long interval. (end)

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