国产精品午夜剧场免费观看,国产中出视频,久久人人爽人人爽人人爽

For cold storage insulation material aspects of the polyurethane spray paint, black material used in various construction process is basically the same spray made of foam is also very similar in appearance, but the white material used for different final result is largely performance differences between manufactured goods, and even some low-quality white insulation material used will not reflect the original intention. To enable products to insulation, energy-saving effect, so long-term interests of investors to maximize the cold realization briefly as follows:
First, the insulation properties of cold storage insulation material:
Polyurethane insulation materials for the cold aspect of the first requirement is that the insulation performance, thermal insulation performance has really put into use before it can not be observed with the naked eye, and to observe the difference in elevation when consumption was already too late. The company through a large number of experimental testing, strict control in the choice of material, in order to achieve this purpose: ① use of structural amine ethers, lower thermal conductivity, enhance the insulation effect; ② all kinds of raw materials and formulations try to reduce the moisture content to avoid foam insulation performance degradation caused by water; ③ polyether main material: rigorous selection of manufacturers of the products after processing, its high degree of uniformity foam cell, the cell wall is thin, insulation performance is superior to conventional thick-walled large hole foam; ④ efficient use tasteless amine catalyst, effectively adjust foam - balancing gel reaction between the coating layer so that the skin is thin, cold storage insulation material properties beneficial to reflect; ⑤ not use ordinary polyester polyols.
Second, the dimensional stability of polyurethane foam insulation materials:
Cold polyurethane foam dimensional changes occur when rapid changes in temperature or long-term at a low temperature (usually contraction), often reflect changes in the size of the foam cracking or peeling, which is bound to affect the normal use of cold storage. In addition to doing regular performance testing simulations, pay more attention to control the choice of high-quality materials aspects: ① special high functionality polyether compound used to make the foam form three-dimensional network structure, greatly improving the bubble low temperature performance; and now 4110 polyether commonly used spray paint contains large amounts of difunctional components, a large number of linear molecular structure formed after the reaction is difficult to stabilize at low temperatures; ② high functionality crosslinkers use also greatly increased the size of the foam stability sex; ③ polyether its selection, the production stage using a strong base catalysis, reaction complete, polyether maintain a high reaction rate (i.e., when in contact with the black material capable of reacting more fully); some manufacturers in order to achieve an apparent foam no deformation of the foam compound is added to the components that may be opening, closed cell foam reducing the rate reached a stable size effect, but at the expense of thermal insulation properties of polyurethane foam insulation material cold.
Third, the polyurethane foam insulation materials cold life:
In addition to the basic properties of the polyurethane foam early, the performance deterioration of the situation is also very important to the foam as an indicator. When white material preparation, the use of certain polyester material surface, although the foam has good toughness, impact resistance, but after a period of time will become brittle cold, no longer resistant to shock, impact; In addition, some polyester foam structure also affects the poor hydrolysis resistance foam life; which uses a polyether structure, although a little early brittle brittle but generally disappears after a few days, then the long-term cold storage insulation material stable performance.
Fourth, the proposal for polyurethane cold insulation materials made several parties:
Cold investment is a long-term, the returns on investment, the high number of the sender is true that the initial investment can be reduced, but needs to grasp a certain limit, take a long-term energy consumption and the initial investment into account, because the polyurethane cold insulation materials its density insulation effect has parabolic relevance; Numerous studies show that the foam density with good insulation properties at 33 to 35 kg / cubic meter, it is generally recommended that the number of parties made cold storage temperature of 22 to 23 square / tonne more appropriate.

website：http://www.zrpm.cn/en/news_view_37_138.html

Previous：Polyurethane insulation for outdoor hot and cold water pipes

Next：PPR polyurethane insulation

Return

News center

News

Industry News

Industry News

Polyurethane insulation materials

Related News