2022.04.28
How is EPS insulation board produced?
EPS insulation board is made of bead-shaped expandable EPS resin containing foaming agent (pentane) as raw material. The EPS bead size is expanded from 0.5mm to 3-4mm by a foaming machine. It is heated and formed in the mold of the molding machine to form a white body with a fine closed-cell structure. Then according to user needs cut into a certain size of EPS insulation board.
Why does EPS insulation board have efficient insulation performance?
EPS insulation board is a thermoplastic material. Each cubic meter of volume contains 3-6 million independent airtight bubbles, and the volume of air contained is more than 98%. Because the thermal conductivity of air is very small (0.029), and it is sealed It cannot be convected in foam plastic, so EPS is made into a material with excellent thermal insulation performance.
What is ordinary EPS? What flame retardant EPS insulation board? What’s the difference?
The oxygen index of ordinary EPS insulation material is less than 22, it will ignite in case of open fire, and it will become more and more prosperous. The combustion performance grade is B3, which is a flammable material. In order to improve the fire resistance of EPS, the oxygen index of EPS can be greatly improved by adding some flame retardants to the ordinary expandable EPS resin. According to the different properties and dosage of flame retardants, flame-retardant EPS is divided into B2-level flame-retardant EPS and B1-level flame-retardant EPS. Flame-retardant EPS is a self-extinguishing material, that is, flame-retardant EPS will be ignited when encountering an open flame, but will extinguish itself after leaving the fire source. Therefore, flame-retardant EPS is also called self-extinguishing EPS.
What is the oxygen index?
Oxygen index refers to the lower limit of oxygen concentration required for the sample to maintain stable combustion in the oxygen-nitrogen mixture flow under specified conditions, expressed as the percentage of oxygen-nitrogen mixture volume occupied by oxygen. The oxygen index was measured with an oxygen index meter.
Oxygen index is a method for evaluating the flammability of plastics and other polymer materials. Because the atmosphere we live in only contains 21% oxygen, that is, the oxygen index is 21. When the oxygen index of the material is greater than 26%, it cannot be burned in ordinary air, that is, it is difficult to burn. Therefore, it is generally considered that the oxygen index <22 belongs to Flammable materials, the oxygen index between 22-27 is a combustible material, and the oxygen index > 27 is a flame-retardant material. In the 97th edition of “Classification Method for Combustibility of Building Materials”, it is stipulated that the oxygen index of grade B1 (flammable material) is ≥26; the oxygen index of grade B2 (combustible material) is ≥32.
What is graphite EPS insulation board?
Graphite EPS insulation board is a new generation of insulation material which is further refined by chemical method on the basis of traditional EPS. Due to the addition of special graphite particles, the graphite EPS insulation board can reflect and absorb infrared rays, so the thermal insulation performance is at least 30% higher than that of traditional EPS, the thermal conductivity can reach 0.032, and the combustion performance level can reach B1 level. Compared with traditional EPS, graphite EPS insulation board is favored by people because of its stronger thermal insulation performance and fire resistance.
What are the consequences of using inferior EPS insulation boards?
The main manifestations of inferior EPS products that we often encounter on construction sites are:
1) The bulk density of EPS is seriously insufficient. The density of EPS for construction shall not be lower than 15kg/m3. If low-density EPS is used, the strength will be reduced, and it is easy to deform and crack when plastered on this EPS board. Therefore, the use of low bulk density EPS in the external thermal insulation system will reduce the overall strength of the external thermal insulation system and the cracking of the surface layer, which will bring serious safety hazards to the external thermal insulation system.
2) Use ordinary B3 grade EPS to pretend to be B2\B1 grade flame retardant EPS. The use of this inferior insulation board will reduce the fire performance of EPS and increase the fire hazard of construction projects.
3) The solubility of EPS is not good. The cross-section of the EPS insulation board with good solubility is that the foam particles are tightly welded without gaps. Twisting EPS foam by hand will not fall off. For the EPS insulation board with poor solubility, the foam particles on the EPS section will fall off by hand twisting. The pull-out strength of this inferior insulation board is low.
4) In order to achieve the goal of reducing EPS materials and achieving the target bulk density, some EPS manufacturers add a “weighting agent” substance in EPS processing or directly mix fine quartz sand into the raw materials. The use of this inferior insulation board will reduce the EPS insulation performance and the bonding strength with the polymer mortar.
What are the main applications of EPS in construction engineering?
EPS is used as a thermal insulation material for wall thermal insulation and roof thermal insulation in construction projects due to its light weight, thermal insulation, and processed characteristics; Color steel sandwich panel; as a decorative material, EPS is processed into various European-style artistic decorative components; as a moisture-proof material, it is used for moisture-proof exterior walls of construction projects below ±0.
How long is the life of EPS insulation board? What are the symptoms of aging?
EPS is widely used in the field of building insulation, which began in Europe affected by the oil crisis in the 1970s and 1980s. It has been used for 30-40 years and continues to be used. The main characteristics of the aging of EPS insulation board are that the material becomes brittle and powdery, the color turns yellow, and the outline is deformed. As long as the EPS is not exposed to ultraviolet radiation for a long time in use, the aging speed of the EPS can be effectively slowed down and the service life can be prolonged.
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