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  • ●使用聚氨酯喷涂机白料时要细致什么 [05-10] ● What to be careful when using polyurethane sprayer white material
  • ●喷涂硬泡聚氨酯外墙防水保温施工流 [05-16] ● Waterproof thermal insulation construction flow for spraying rigid foam polyurethane exterior
  • ●哪些因素会影响聚氨酯发泡质量 [05-07] ● What factors will affect the quality of polyurethane foam
  • ●必看! [05-10] ● Must see! The relationship between waterproof coating thickness and waterproof life
  • ●聚氨酯发泡机混合器中物料的流场分 [05-18] ● Flow field analysis of materials in mixer of polyurethane foaming machine
  • ●保温材料阻燃性能不合格成冷库安全 [05-05] Insufficient flame retardant performance of insulation materials to become safe in cold storage
  • ●现代建筑工地为什么要用【聚氨酯发 [03-21] ● Why use modern polyurethane construction site
  • ●怎么解决聚氨酯发泡机空泡现象 [05-08] ● How to solve the cavitation phenomenon of polyurethane foaming machine
  • ●聚氨酯保温材料行业未来发展前景可 [05-12] ● The future development prospects of polyurethane thermal insulation material industry are promising
  • ●温度控制是解决聚氨酯发泡机的空泡 [05-08] ● Temperature control is to solve the cavitation of polyurethane foaming machine
  • ●购买防水涂料需要重点关注的性能指 [05-10] ● The performance indicators that need to focus on when buying waterproof coatings
  • ●如何在屋顶操作聚氨酯喷涂 [09-10] ● How to operate polyurethane spray on the roof
  • ●「聚氨酯产品」地铁防水工程复合防 [07-24] ● "Polyurethane Products"
  • ●异氰酸酯与聚脲弹性体性能的关系 [08-17] The relationship between isocyanate and polyurea elastomer performance
  • ●详解聚氨酯发泡机操作规程 [05-07] ● Detailed operation rules of polyurethane foaming machine
  • ●聚氨酯喷涂作业时“应该”和“不应 [10-29] ● "should" and "should not" when spraying polyurethane
  • ●影响聚氨酯喷涂施工出方率的几个因 [10-29] ● Several factors affecting the yield of polyurethane spraying construction
  • ●聚氨酯喷涂施工的常见问题及原因 [10-29] ● Common problems and reasons of polyurethane spraying construction
  • ●聚氨酯防腐应用以及储存 [10-21] ● Application and storage of polyurethane anticorrosion
  • ●聚氨酯防腐漆在出现剥落现象 [10-21] ● The polyurethane anticorrosive paint is peeling off
  • ●聚氨酯防腐的主要涂覆方法 [10-21] ● Main coating methods for polyurethane anticorrosion
  • ●聚氨酯防腐的涂装工艺 [10-21] ● Polyurethane anticorrosive coating process
  • ●如何提高聚氨酯防腐的性能 [10-21] ● How to improve the anticorrosive performance of polyurethane
  • ●聚氨酯防腐适用领域以及特点 [10-21] ● Application areas and characteristics of polyurethane anticorrosion
  • ●聚氨酯高压喷涂设备的主要优点 [10-19] ● Main advantages of high pressure polyurethane spray equipment
  • ●聚氨酯发泡机选购前的对比方法 [09-19] ● Comparison method before purchasing polyurethane foaming machine
  • ●聚氨酯发泡机特点和工作流程介绍 [09-19] ● Introduction of polyurethane foam machine characteristics and work flow
  • ●聚氨酯高压发泡机和低压发泡机的区 [08-08] ● The area of polyurethane high pressure foaming machine and low pressure foaming machine
  • ●「耐高温材料」聚氨酯硬泡的发展方 [07-25] ● Development method of "high temperature resistant material" polyurethane rigid foam
  • ●「ws15」喷涂型聚氨酯应用指南 [07-25] ● "ws15" Spraying Polyurethane Application Guide
  • Several factors affecting the yield of polyurethane spraying construction
    来源:http://motokone.com发布时间: 2019-10-29 14:03 Author: Polyurethane foam machine Source: http: //motokone.com Published: 2019-10-29 14:03
    Rigid polyurethane insulation material is a polymer with repeating structural unit of urethane segment, which is made by reacting isocyanate and polyol. Because of its good thermal insulation performance and excellent waterproof performance, it is widely used in external wall insulation, roof insulation, and cold storage, grain storage, archives, pipes, doors and windows and other special parts. Polyurethane rigid foam is widely used in roofing and wall insulation in foreign countries. The main application forms are composite panels and field spraying.
    Several factors affecting the yield of polyurethane spraying construction
    Hard foam polyurethane spraying belongs to the on-site processing of chemical products. The spraying technology is difficult to master. Due to different design requirements and external factors, the spraying rate of polyurethane spraying is also different, mainly due to the following factors.
    (1) Design requirements determine the basic range of the output rate
    Due to the different efficiency of the building, the design requirements for thermal insulation and energy saving are also different, and the density design requirements for polyurethane are different. So when talking about the output rate, first look at the design requirements. For example, the design requires a bulk density (core material density) of 30 kg / m3, and a theoretical (without any loss) rate of one ton is 33 square meters. For a design density of 40KG / m3, the theoretical yield should be 25. According to many years of engineering experience, the actual loss due to many factors during the construction process is between 15% and 25%, resulting in rising costs.
    (2) the effect of material ratio deviation on the yield

    There is a large difference in the density of machine and manual bubbles. Generally, the fixed material ratio of the machine is 1: 1, but the actual material ratio and the fixed material ratio of the machine sometimes do not match due to factors such as volume calculation and equipment failure. When the amount of white material is excessive, the foam density is low, the color is whitish, the foam strength is reduced, the hand feels soft, and it is easy to shrink when the temperature is low. . In these cases, the material ratio should be checked immediately to see if the filter is blocked and the pressure and temperature indicators are normal to ensure the accuracy of the black and white material ratio. The deviation of the material ratio has a certain effect on the output rate and the construction quality.
    (3) the effect of ambient temperature on the output rate
    Polyurethane foam is greatly affected by temperature. Foaming relies on heat. Without heat, the foaming agent in the system cannot evaporate, so that foam plastic cannot be formed. Heat comes from both chemical reaction generation and environmental provision. The heat of chemical reaction is not affected by external factors, and the heat provided by the environment changes with the change of ambient temperature. When the ambient temperature is high, the environment can provide heat to the reaction system, which can increase the reaction speed and shorten the reaction time. It shows that the foam is fully foamed, and the density of the foam surface layer and the core is close. When the ambient temperature is low (such as below 15 ° C), part of the reaction heat will be released to the environment. The loss of heat, on the one hand, causes the foam to mature for an extended period of time, which increases the foam molding shrinkage (the lower the temperature, the higher the molding shrinkage); on the other hand, the amount of foam material is increased. Experiments show that the same foaming material has a foaming volume at an ambient temperature of 15 ° C that is 25% smaller than a foaming volume at 25 ° C, thereby increasing the production cost of the foam. When the ambient temperature is lower than 15 degrees, the construction should pay attention to adjust the temperature control device of the spraying equipment to make up for the reaction limitation brought by the temperature drop to the raw material, so as to simulate the good temperature required for the polyurethane reaction as much as possible.
    (4) Wind
    When spraying, the wind speed should be below 5m / s. When the wind speed exceeds 5m / s, the heat generated by the reaction will be lost, which will affect the rapid foaming reaction of the polyurethane foam and make the product surface brittle. At the same time, because the spray foaming machine mixes the raw materials and sprays them in an atomized state, if the wind speed is too large, the atomized particles will be blown away, increasing the loss of raw materials and polluting the environment.
    (5) Basic temperature and humidity
    It can be seen from engineering practice that the temperature of the base wall has a great influence on the foaming efficiency of polyurethane. During the spraying process, if the ambient temperature and the temperature of the base wall of the building are very low, after spraying the rigid foam polyurethane once, the reaction heat will be quickly absorbed by the base layer, thereby reducing the amount of foaming of the material. Therefore, the noon break should be shortened as much as possible during construction, and procedures should be reasonably arranged in the construction arrangement process to ensure the foaming rate of rigid foam polyurethane. Rigid polyurethane foam is a polymer product produced by the two-component mixing reaction of isocyanate and combined polyether. The isocyanate component easily reacts with water to form urea. If the urea bond content in the polyurethane increases, the foam will become brittle and the adhesion between the foam and the substrate will be reduced. Therefore, it is required that the surface of the substrate to be sprayed is clean and dry, the relative humidity is less than 80%, and there is no rust, no dust, no pollution, no moisture, and no construction is allowed on rainy days. Dew or frost should be removed and dried.
    (6) Effect of sprayed layer thickness on yield
    According to the thickness, spraying requires different environments. Generally, the multi-layer spraying method is used. According to the requirements of the national standard, the thickness of the first layer and the thickness of each layer have certain regulations. On the one hand, the thermal insulation performance of the polyurethane is guaranteed; Work reasonably along the response curve of polyurethane. However, as each layer will have crusts, the thicker the thickness of each layer, the more the output ratio will be, but in order to increase the output ratio, it is not advisable to blindly request the output in violation of the polyurethane spraying process requirements. Construction personnel are required to handle the site on the basis of experience and quality assurance.
    (7) The impact of construction rate
    In the construction of polyurethane spraying, material waste is extremely serious in the construction of corners, decorative lines, ceilings, beam structures, and daughter walls. For example, in the construction of large corners, nearly 1/2 of the material cannot be sprayed onto the wall. In the ceiling construction, because of the small surface of the sprayed construction, material waste is inevitable. Therefore, during the construction of special parts, more attention should be paid to the unification of construction technology and construction conditions.
    (8) Effect of flatness on output ratio
    During the construction process, the flatness of the grassroots should also be effectively controlled. The flatness of the base wall is too poor, which also causes a certain amount of material waste. In addition, if the flatness error of the base wall is too large during the polyurethane spraying process, it is necessary to saw away the part with a large local positive deviation, which wastes polyurethane material and labor costs, and also brings difficulties to subsequent construction.
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