Combined polyether, polyurethane raw material composition, polyurethane insulation material derived therefrom, preparation method and application thereof
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A technology of combining polyether and thermal insulation materials, applied in the field of polyurethane, can solve the problems of foam cracking, foam heartburn, heat can not be dissipated in time, etc., to achieve good thermal insulation effect and prevent cracking.
Active Publication Date: 2021-12-07
SHANGHAI DONGDA POLYURETHANE
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Problems solved by technology
[0005] The tank body insulation foam made by the spray foaming molding process has no cold bridge, can maximize the insulation effect, and is convenient to construct, and can meet the requirements of different shapes of tanks. However, due to the fast reaction speed of the spraying process, the The heat cannot be dissipated in time, which will cause problems such as heartburn inside the foam and overall cracking of the foam due to too high heat
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Examples
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Embodiment 1
[0047] This example relates to a method for preparing a spray-coated polyurethane insulation material for LNG storage tanks. 20 parts of NJ-4110, 10 parts of YD-8310, 10 parts of NJ-403, 20 parts of PS-3152, 40 parts of AKS7004, 2 parts of S-198, 3 parts of PT303, 4 parts of Polycat 77, 1 part of DABCO T-12, 0.6 parts of water, 35 parts of TCPP, 16 parts of HFC-245fa are mixed at 16°C Obtain A component after uniformity, and then use a sprayer to spray A component and PAPI at a mass ratio of 1:1 to prepare a polyurethane foam sample.
Embodiment 2
[0049] This example relates to a method for preparing a spray-coated polyurethane insulation material for LNG storage tanks. 35 parts of NJ-4110, 10 parts of NJ-404A, 15 parts of YD-450BC, 40 parts of AKS7004, and 2 parts of DC- 193, 4 parts of PT303, 5 parts of NTCAT SF304, 0.5 parts of DABCO T-12, 0.5 parts of water, 40 parts of TCPP, 5 parts of TEP, and 17 parts of HFC-245fa are mixed uniformly at 16°C Obtain component A, and then use a sprayer to spray component A and PAPI at a mass ratio of 1:1 to prepare polyurethane foam samples.
Embodiment 3
[0051] This example relates to a method for preparing a spray-coated polyurethane insulation material for LNG storage tanks. 20 parts of YD-8310, 15 parts of NJ-403, 15 parts of YD-450BC, 30 parts of PS2352, 20 parts of AKS7004, 2 parts of S-198, 4 parts of PT303, 5 parts of NTCAT SF304, 3 parts of Polycat 77, 0.4 parts of water, 30 parts of TCPP, 10 parts of TEP, 18 parts of HFC-245fa at 16°C After mixing evenly, component A was obtained, and then a spraying machine was used to spray component A and PAPI at a mass ratio of 1:1 to prepare polyurethane foam samples.
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Abstract
This application relates to a combined polyether, which is made of the following raw material components based on parts by weight: 40-60 parts of polyether polyol, 40-60 parts of polyester polyol, and 8-12 parts of catalyst , 2-3 parts of foam stabilizer, 15-18 parts of blowing agent, and 0.4-0.6 part of water; the hydroxyl value of the polyether polyol is 300-800mgKOH / g, and the viscosity at 25°C is 1000-30000mPa .s; the hydroxyl value of the polyester polyol is 250-350mgKOH / g, and the viscosity at 25°C is 2000-15000mPa.s. The present application also provides a polyurethane raw material composition comprising the above combined polyether, a polyurethane insulation material derived therefrom, and a method thereof. The application also provides the application of the polyurethane insulation material in the preparation of the insulation layer of the liquefied natural gas storage tank. The foaming reaction heat of the polyurethane thermal insulation material of this application is lower than 140°C, the volume change rate of the dimensional stability -180°C / 48h is less than -0.5%; the foam spraying density is 80-85kg / m 3 , the thermal conductivity is less than 22mw / m.k, and the insulation effect is good when the insulation layer is prepared on the liquefied natural gas tank. At the same time, it can prevent cracking and effectively resist external pressure resulting in foam damage.
Description
technical field [0001] The application relates to the technical field of polyurethane, specifically, the application relates to a combined polyether, a polyurethane raw material composition comprising the combined polyether, a polyurethane thermal insulation material derived from the polyurethane raw material composition, and the polyurethane thermal insulation material Preparation methods and applications. Background technique [0002] Natural gas is one of the three pillars of world energy, among which liquefied natural gas (LNG) has the advantage of high latent heat of vaporization. Under one atmospheric pressure, liquefied natural gas can release about 879J / kg of energy when it is transformed into a gaseous state at room temperature. Therefore, the significance of storing and transporting LNG is self-evident. However, the temperature of liquefied natural gas is relatively low, which can reach -165°C. Designing a material with low temperature resistance and good thermal...
Claims
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Application Information
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