First, the thermal insulation performance of cold storage insulation materials:

The first requirement of polyurethane thermal insulation materials is thermal insulation performance, and the quality of thermal insulation performance cannot be observed with the naked eye before it is actually put into use. It is too late to observe the difference in power consumption. Through a large number of experimental tests, we hope to achieve this goal: ① Use structural amine ethers to reduce thermal conductivity and improve thermal insulation effect; ② Try to reduce the water content in various raw materials and formulas to avoid the deterioration of thermal insulation performance caused by water foaming; ③ Main material polyether: The products of large factories that have undergone strict post-treatment are selected. Compared with the polyethers of small factories without post-treatment, the foam cells have high uniformity and thin cell walls, and the thermal insulation performance is obviously better than that of thick walls. Ordinary foam with large pores; ④ The use of efficient and odorless amine catalysts can effectively adjust the balance of foaming-gel reaction, make the skin between the spray layers thinner, which is conducive to the performance of cold storage insulation materials; these control measures have received quite good results. Effect.

2. Dimensional stability of polyurethane insulation material foam:

The polyurethane foam material of the cold storage will undergo dimensional changes (generally shrinking) when the temperature changes drastically or when the temperature is low for a long time. The dimensional changes are often reflected in the foam cracking or falling off, which will inevitably affect the normal use of the cold storage. In addition to regular performance testing of simulations, more attention is paid to the control of selecting high-quality materials: ① The compounded use of special high-functionality polyether makes the foam form a three-dimensional network structure, which greatly improves the low temperature resistance of the foam; The 4110 polyether often used in spray coatings contains a large number of difunctional components, and a large number of linear molecular structures formed after the reaction are difficult to stabilize at low temperatures; ② The use of high-functionality crosslinking agents also greatly improves the dimensional stability of the foam ③The selected polyether is catalyzed by a strong base in the production stage, and the reaction is thorough, so that the polyether maintains a high reaction rate (that is, it can react more completely when it is in contact with the black material); in order to achieve the appearance of foam, some manufacturers The open-cell component is added to the foam without deformation, which reduces the closed cell rate of the foam and achieves the effect of stabilizing the size, but it sacrifices the thermal insulation performance of the polyurethane cold storage insulation material foam.

3. The service life of polyurethane cold storage insulation material foam:

In addition to the basic properties of the polyurethane foam at the initial stage, the performance deterioration of the foam is also an important indicator. In the preparation of white materials, although some polyester materials have good toughness and impact resistance on the use surface of the foam, they will become brittle after a period of use in cold storage, and are no longer resistant to impact and collision; in addition, some The poor hydrolysis resistance of polyester structural foam will also affect the service life of the foam; it adopts a polyether structure, which is slightly brittle at the beginning, but generally disappears after a few days, and then maintains the stable performance of the cold storage insulation material for a long time.

4. Suggestions on the number of prescriptions for polyurethane cold storage insulation materials:

Cold storage investment is a long-term and profitable investment. It is true that a high number of sources can reduce the initial investment, but it needs to grasp a certain limit. Long-term energy consumption and initial investment must be considered comprehensively, because the polyurethane cold storage insulation material The thermal insulation effect has a parabolic correlation with its bulk density; a large number of studies have shown that the foam bulk density has a good thermal insulation performance when the bulk density is 33~35 kg/m3, so it is usually recommended that the number of prescriptions for constant temperature cold storage is 22~23 cubic meters/ton.

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