College】 【weak choice of polyurethane insulation materials cold】.

<br> present polyurethane insulation in cold storage cold storage building on the initial investment costs and long-term gains have an important role; cheap raw materials can reduce the initial investment of course, but better quality raw materials in exchange for long-term returns. .The face of fierce competition in the raw material suppliers, faced with good or bad only found out after use of raw materials, how to make better choices so that each refrigerator has become a major headache for investors. .<BR> Insulation materials for cold storage of the polyurethane spray paint, each with a black material, spraying the same construction process to make the foam is also very similar in appearance, but the white material used will be largely different ., causing the performance difference between the final manufactured goods, and even some white material the use of low-quality thermal insulation of the mind will not be reflected. .In order to achieve the thermal insulation products, energy-saving effects, long-term interests of investors to cold storage to maximize the realization of a company in Shandong Province in this combination of quality control of products, simply described as follows: <BR> First, the insulation properties of insulation materials cold storage: using .cold storage areas in the first requirement is the polyurethane insulation materials insulation performance, good or bad insulation properties into use before the real can not be observed with the naked eye out to the observed differences between high and low power consumption have already too late. .The company through a large number of experimental testing, the choice of material, strict control, in order to achieve this purpose: ① using structural amine ethers, lower thermal conductivity to enhance the insulation effect; ② a variety of raw materials and reduce the water content of the formula as far as possible, to avoid .Foam insulation performance degradation caused by water; ③ the main material of polyether: chosen after rigorous treatment of the maker of products (such as Jinling Petrochemical Company), and small factories without post-processing of the polyether compared to the uniform bubble foam .high degree of foam thin walls thick insulation is superior to the ordinary large hole foam; ④ efficient use of odorless amine catalyst, effectively adjust the foam - the balance of gel reaction, the skin thin coating layer, .performance of insulation materials conducive to the embodiment of cold storage; ⑤ do not use ordinary polyester polyols. .These control measures <BR> received very good results, in Jining, a customer at a number of cold storage compared with the white material in cold storage were significantly higher than other manufacturers to use low power consumption white material of the cold storage. .<BR> Second, the dimensional stability of polyurethane foam insulation materials: polyurethane foam cold storage in the severe or long-term temperature changes occur at a low temperature change in size (usually shrinking), often reflected in changes in size of bubbles or cracking .off, and these will certainly affect the normal use of cold storage. .In addition to well simulate the performance of regular testing, but also focus on selected aspects of quality control materials: ① special officials to Polyether compound used to make foam three-dimensional network structure, greatly improve the low temperature resistance of the bubble; and present .4110 commonly used spray paint contains large amounts of two polyether functionality of ingredients, reaction to form a linear molecular structure of a large number of cases is difficult to stabilize at a low temperature; ② degree of crosslinking of the use of high-ranking officials can also greatly improve the size of the bubble .stability; ③ the use of polyether, the production phase by alkali catalyst, the reaction completely, the polyether to maintain a high response rate(that is in contact with the black material could be more complete response); some of the vendors in order to achieve the bubble sheet .Outlook does not produce distortion phenomenon can be added to the foam compound hole components, reducing the rate of closed-cell foam to reach a stable size of the effect, but at the expense of polyurethane foam insulation materials cold insulation properties. .<BR> Third, polyurethane foam insulation materials cold storage life: In addition to the basic properties of the initial polyurethane foam, the foam performance degradation status of an indicator is also very important. .White material in the preparation, some of the polyester, although the use of materials on the surface so that the foam has good toughness, impact resistance, but in the cold storage will become brittle after a period of use is no longer resistant to shock, impact; In addition, some .hydrolysis of polyester is poor structural foam bubbles will also affect the service life; the use of polyether structure, although initially a little brittle brittle but generally disappears a few days, then long-term cold storage stability of the performance of insulation materials. .<BR> <BR> <BR> Four cold storage on the polyurethane insulation materials sender few suggestions: cold storage investment is a long-term, income investment returns, the sender can reduce the number of high initial investment is true, but it needs to grasp .a certain limit, the long-term energy consumption and make the initial investment into account, because the polyurethane insulation materials cold insulation effect of its density has a parabolic relationship; large number of studies show that the foam density of 33 ~ 35 kg / m, have a good .insulation performance, it is generally recommended that the sender the number of cold storage temperature of 22 to 23 square / ton more appropriate. .<BR> Finally, careful recommendations: polyurethane insulation materials cold insulation properties, dimensional stability, key performance indicators such as life is invisible, intangible and can not feel, the merits of short of the line between good and bad, in your choice .Please choose insulation materials cold when "high quality" and then note that "cheap", do not blindly just pay attention to the price!.