Insulation properties of polyurethane cold choice and control
1, cold storage Insulation material Insulation performance
Polyurethane insulation materials for cold storage of the first requirement is that insulation performance, thermal insulation performance is good or bad in the real can not be put into use before observation with the naked eye out to the observed differences in the time of the high power consumption is too night. Through a large number of experimental tests conducted in the following choice of material, strict control, can achieve this purpose:
using structural amine ethers, lower thermal conductivity to enhance the insulating effect;
various raw materials and formulations in the lower water content as much as possible to avoid deterioration of water foam insulation performance caused;
main material polyether; selected after rigorous treatment of the product, and without post-processing of polyether compared to the uniformity of the bubble foam high, the cell wall is thin and is superior to the posterior wall insulation macroporous ordinary bubble;
High tasteless use of amine catalysts to effectively adjust the foam – the balance gel reaction to spray thin surface layer, favorable to the embodiment of cold insulation material properties;
do not use ordinary polyester polyol.
These control measures can be received very good results, cold low power consumption.
2, Dimensional Stability of Polyurethane Foam Insulation
Cold storage of polyurethane foam is severe or long-term temperature changes occur at a low temperature change in size (usually shrink), often reflected in changes in the size of crack or fall off the bubble, which inevitably affects the normal cold use. In addition to the simulation of well performance testing, but also focus on high-quality materials in the choice of control:
special high functionality polyether compound used to form three-dimensional network structure foam, foam greatly improved low temperature performance; and pre-spray Paint Frequently used ZS-4110 polyether contains a large number of 2-functional components, the reaction to form a linear molecular structure of a large number of cases is difficult to stabilize at low temperatures;
Degree Crosslinker officials can greatly increase the use of foam dimensional stability;
the use of polyether, the production phase with strong base catalyst, the reaction completely, so that polyether to maintain a high response rate (that is, the black material in contact with the more able to respond to security); some of the vendors in order to achieve the bubble sheet Outlook does not produce deformation of compound added to the foam component can be perforated, closed cell foam lower rate, reaching a stable size of the effect, but at the expense of polyurethane insulation materials cold insulation properties.
3, polyurethane foam insulation materials cold storage life
Addition to the basic properties of the initial polyurethane foam, the foam's performance degradation is also important to state an indicator. White material in the preparation, some of the polyester surface, although the use of materials to make foam has good toughness, impact resistance, but in cold storage over time become brittle, not high impact, collision; In addition, some hydrolysis resistance of polyester foam structure also affects the bubble life poor; the use of polyether structure, although initially a little brittle brittle but generally disappears a few days, then cold insulation material to maintain stable long-term performance.
4, insulating material made of polyurethane cold side of the proposed number of
Cold storage is a long-term investment, income investment returns, long-term energy consumption should be taken into account with the initial investment, because the polyurethane insulation materials, thermal insulation effect of cold storage and its bulk density has a parabolic nature of the association; numerous studies show that the foam density of 33 ~ 35kg/m3, have a good insulation properties, it is generally recommended number of constant temperature refrigerator France in 22 ~ 23m3 / t appropriate.
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I am China Crafts Suppliers writer, reports some information about filter shower heads , grohe shower fixtures.
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