Pentane in pentane foaming agent is mainly composed of n-pentane and isopentane, and when the proportion reaches more than 99%, it can be used as styrene foaming agent and finished EPS; In addition, n-pentane can be used for foaming of building panels. When making polyurethane foaming agent, it is mainly cyclopentane, which is mainly used for foam in refrigerator door body.
Polystyrene foam board, also known as foam board and EPS board, is a white object heated by polystyrene beads containing volatile liquid blowing agents and preheated by heating. It has a structural feature of micro closed holes. It is mainly used for building walls, roof insulation, composite board insulation, cold storage, air conditioning, vehicles, ships, thermal insulation, floor heating. Decoration and carving are widely used.
Expandable polystyrene (EPS), commonly known as polystyrene and styrene copolymer, is a mixture of resin, physical foaming agent and other additives. The expandable PS can be processed into low density (0.7 – 10.0ib / FT3) foam plastics. The most common expandable polystyrene is transparent PS pellets containing pentane as foaming agent.
n-Pentane can be used to prepare Isopentane and as extractant. Polystyrene foaming agent, liquid air lubricant.
EPS foam is a liquid foaming agent added with low boiling point in polystyrene beads. Under the condition of heating and pressurizing, it is permeated into polystyrene beads and swelled to make expandable polystyrene resin (beads). EPS foam is mainly composed of plastic and contains a large number of bubbles. Therefore, EPS foam can be said to be a composite plastic filled with gas.
EPS Foaming Agent
EPS foaming agent generally requires its boiling point to be lower than 95 ℃ under normal pressure, mainly including butane, pentane (n-pentane, isopentane), etc. In actual production, because the boiling point of pentane is higher than that of butane, the EPS produced is easier to control when molding than that of butane as foaming agent without constant temperature preservation, so pentane is mostly used as foaming agent, or the mixture of n-pentane and isopentane is used as foaming agent. Generally, the hardness of water quality shall not be higher than 10 – 5, and the chloride radical shall not be higher than 210 – 5. Generally, the pH value shall be in the range of 6.5 ~ 7.5. The water oil ratio refers to the mass ratio of water to monomer during feeding, and the water oil ratio is generally in the range of 1.4 ~ 2.0. In the actual production process, warm water can be intermittently or continuously injected into the kettle in the later stage of the reaction according to the formation of particles, so as to make the reaction stable and easy to control. The suspension polymerization of iron styrene has strict requirements for iron. Generally, the iron quality of the system shall be controlled below 210 – 6, and the equipment and pipes shall be made of stainless steel, enamel or plastic coated. Effect of dispersion system on particle size and particle size distribution under a certain water oil ratio and stirring speed, the dispersion dose increases and the particle size decreases. The dispersion dose decreases and the particle size increases, which can enhance the protection ability of the system, the particle distribution tends to be concentrated, and improve the impact of the receiving and stirring speed of the target product on the particle size. Generally, the increase of the stirring speed increases the number of large particles and decreases the number of small particles. However, there is also a critical value of speed. At this time, the average particle size is the smallest and the particle size distribution is concentrated. When it is higher or lower than the critical speed, the average particle size will increase and the distribution will become wider. The stirring speed of polymerization kettle is generally controlled at 75 ~ 110R / min, while that of impregnation kettle is 80 ~ 120r / min. 3 polystyrene foam (EPS) characteristics and application of polystyrene foam (EPS) characteristics of EPS from polystyrene particles foaming, polystyrene particles mainly contain polystyrene, soluble pentane (expansion component) and fire retardant. According to the way of foaming, it can be divided into two categories: foaming in model and extrusion foaming. In the molding process of EPS, pentane in polystyrene particles is heated and vaporized, and expands in the particles to form many closed cavities. This uniform closed cavity structure determines that EPS has many characteristics that other materials do not have. The density of EPS is determined by the expansion multiple of polystyrene particles in the molding stage, which is between 10 ~ 40kg / m. EPS with a density of between 15 kg / M and 30kg / M is commonly used in engineering. At present, EPS used as light filler in many civil engineering projects has a density of 20 kg / m, which is only 1 / 50 ~ 1 / 100 of that of common filler. Density is an important index of EPS, and its mechanical properties are closely related to it. Water absorption characteristics the water absorption of EPS material is related to the density, water head height and manufacturing process of the material. The water absorption of EPS produced by in mold foaming method is greater than that produced by extrusion foaming method. Moreover, the bubbles distributed inside EPS produced by in mold foaming method are independent of each other, not connected with the outer boundary, but only partially absorbed by the surface layer.
Pentane in pentane foaming agent is mainly composed of n-pentane and isopentane, and when the proportion reaches more than 99%, it can be used as styrene foaming agent and finished EPS; In addition, n-pentane can be used for foaming of building panels. When making polyurethane foaming agent, it is mainly cyclopentane, which is mainly used for foam in refrigerator door body.
Polystyrene foam board, also known as foam board and EPS board, is a white object heated by polystyrene beads containing volatile liquid blowing agents and preheated by heating. It has a structural feature of micro closed holes. It is mainly used for building walls, roof insulation, composite board insulation, cold storage, air conditioning, vehicles, ships, thermal insulation, floor heating. Decoration and carving are widely used.
EPS foam is a liquid foaming agent added with low boiling point in polystyrene beads. Under the condition of heating and pressurizing, it is permeated into polystyrene beads and swelled to make expandable polystyrene resin (beads). EPS foam is mainly composed of plastic and contains a large number of bubbles. Therefore, EPS foam can be said to be a composite plastic filled with gas.
EPS Foaming Agent
EPS foaming agent generally requires its boiling point to be lower than 95 ℃ under normal pressure, mainly including butane, pentane (n-pentane, isopentane), etc. In actual production, because the boiling point of pentane is higher than that of butane, the EPS produced is easier to control when molding than that of butane as foaming agent without constant temperature preservation, so pentane is mostly used as foaming agent, or the mixture of n-pentane and isopentane is used as foaming agent. Generally, the hardness of water quality shall not be higher than 10 – 5, and the chloride radical shall not be higher than 210 – 5. Generally, the pH value shall be in the range of 6.5 ~ 7.5. The water oil ratio refers to the mass ratio of water to monomer during feeding, and the water oil ratio is generally in the range of 1.4 ~ 2.0. In the actual production process, warm water can be intermittently or continuously injected into the kettle in the later stage of the reaction according to the formation of particles, so as to make the reaction stable and easy to control. The suspension polymerization of iron styrene has strict requirements for iron. Generally, the iron quality of the system shall be controlled below 210 – 6, and the equipment and pipes shall be made of stainless steel, enamel or plastic coated. Effect of dispersion system on particle size and particle size distribution under a certain water oil ratio and stirring speed, the dispersion dose increases and the particle size decreases. The dispersion dose decreases and the particle size increases, which can enhance the protection ability of the system, the particle distribution tends to be concentrated, and improve the impact of the receiving and stirring speed of the target product on the particle size. Generally, the increase of the stirring speed increases the number of large particles and decreases the number of small particles. However, there is also a critical value of speed. At this time, the average particle size is the smallest and the particle size distribution is concentrated. When it is higher or lower than the critical speed, the average particle size will increase and the distribution will become wider. The stirring speed of polymerization kettle is generally controlled at 75 ~ 110R / min, while that of impregnation kettle is 80 ~ 120r / min. 3 polystyrene foam (EPS) characteristics and application of polystyrene foam (EPS) characteristics of EPS from polystyrene particles foaming, polystyrene particles mainly contain polystyrene, soluble pentane (expansion component) and fire retardant. According to the way of foaming, it can be divided into two categories: foaming in model and extrusion foaming. In the molding process of EPS, pentane in polystyrene particles is heated and vaporized, and expands in the particles to form many closed cavities. This uniform closed cavity structure determines that EPS has many characteristics that other materials do not have. The density of EPS is determined by the expansion multiple of polystyrene particles in the molding stage, which is between 10 ~ 40kg / m. EPS with a density of between 15 kg / M and 30kg / M is commonly used in engineering. At present, EPS used as light filler in many civil engineering projects has a density of 20 kg / m, which is only 1 / 50 ~ 1 / 100 of that of common filler. Density is an important index of EPS, and its mechanical properties are closely related to it. Water absorption characteristics the water absorption of EPS material is related to the density, water head height and manufacturing process of the material. The water absorption of EPS produced by in mold foaming method is greater than that produced by extrusion foaming method. Moreover, the bubbles distributed inside EPS produced by in mold foaming method are independent of each other, not connected with the outer boundary, but only partially absorbed by the surface layer.