Low temperature resistant LNG thermal insulation material and preparation method thereof

A technology of thermal insulation material and low temperature resistance, applied in the field of materials, can solve the problems of thermal conductivity of cell rupture, shortened service life of materials, damage of material structure, etc., and achieves the effects of good flame retardancy, prevention of heat loss and low thermal conductivity

Inactive Publication Date: 2009-02-04
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the existing patent [ZL03132987.X], there is a small range of resistance to sharp temperature changes from low temperature to room temperature or higher temperature, which is easy to cause the increase of the thermal conductivity of the cell rupture and the shortening of the service life of the material; while the patent [200310109202 ], although the polyether polyol with polyamine as the initiator has been improved in low temperature resistance and mechanical properties, but when the low temperature and high temperature change each other (thermal alternation), the shrinkage and expansion of the material The process causes severe damage to the structure of the material, resulting in a decrease in performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Proportion:

[0031] A component: the proportion of the complex is as follows:

[0032] 1. Mixed polyol 73%,

[0033] 2. Foaming agent 2%,

[0034] 3. Silane foam stabilizer 3%,

[0035] 4. Flame retardants containing phosphorus 15%,

[0036] 5. Mixed catalyst 2%,

[0037] 6. Chain extender 5%;

[0038] B component: isocyanate (MDI) N CO / OH molar ratio is 1.05:1.

[0039] 2. Preparation:

[0040] Mix the above 1 to 6 components evenly and store them in the material tank of the foaming machine; store the isocyanate (MDI) in the material tank of the foaming machine B; Internal compression molding.

[0041] Its beneficial effects: In addition to the low temperature above -220 ℃ and the temperature difference of 300 ℃, the mechanical properties remain unchanged for a long time, and the foaming speed is fast, the mechanical properties are relatively high, the compressive strength can reach 38Mpa, and the thermal conductivity is 0.015w / m.k , the average cell size ...

Embodiment 2

[0043] 1. Proportion:

[0044] A component: the proportion of the complex is as follows:

[0045] 1. Mixed polyol 81%,

[0046] 2. Foaming agent 2%,

[0047] 3. Silane foam stabilizer 10%,

[0048] 4. Flame retardants containing phosphorus 5%,

[0049] 5. Mixed catalyst 0.5%,

[0050] 6. Chain extender 1.5%.

[0051] B component: isocyanate (MDI) NCO / OH molar ratio is 1:1.

[0052] Two, preparation method is the same as embodiment 1.

[0053] Its beneficial effect: Except for the low temperature above -220°C and the temperature difference of 300°C, the mechanical properties remain unchanged for a long time, the compressive strength can reach 25Mpa, the thermal conductivity is 0.011w / m.k, and the average cell size is 90μm.

Embodiment 3

[0055] 1. Proportion:

[0056] A component: the proportion of the complex is as follows:

[0057] 1. Mixed polyol 97%,

[0058] 2. Foaming agent 1.3%,

[0059] 3. Silane foam stabilizer 0.5%,

[0060] 4. Flame retardants containing phosphorus 1%,

[0061] 5. Mixed catalyst 0.1%,

[0062] 6. Chain extender 0.1%.

[0063] B component: isocyanate (MDI) NCO / OH ratio is 1.05:1.

[0064] Two, preparation method is the same as embodiment 1.

[0065] Its beneficial effects: In addition to the low temperature above -220 ℃ and the temperature difference of 300 ℃, the mechanical properties of long-term use remain unchanged, the comprehensive performance of mechanics and heat conduction is good, the compressive strength can reach 30Mpa and the thermal conductivity is 0.012w / m.k. The average size of the pores is 110 μm.

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Abstract

The invention discloses a low temperature resistant LNG heat insulating material and a preparation method thereof. The material is prepared as follows: a component A consists of 60 to 97 percent of mixed polyhydric alcohols, 0.1 to 2 percent of a catalyzer, 0.5 to 10 percent of a foam homogenizer, 2 to 15 percent of a foaming agent, 2 to 15 percent of a fire retardant and 0.1 to 5 percent of a chain extendor; the component A reacts with a component B in isocyanate series to prepare and get the low temperature resistant LNG heat insulating material. The material can be used for long term at low temperature above 220 DEG C below zero, which has excellent cold insulativity and mechanical properties. The material can be adaptable to the quick change of temperature above 300 DEG C, and has high fire resistance and small coefficient of heat conductivity, which can effectively prevent the thermal loss of ultra-low temperature fluid and is a pollution-free energy-saving thermal insulative cold insulating material with high performance.

Description

technical field [0001] The invention belongs to the field of materials, and more specifically relates to an ultra-low thermal insulation material and a preparation method thereof. The material can be used in storage and transportation of liquefied natural gas, liquid nitrogen, liquid oxygen and other ultra-low temperature substances. Background technique [0002] Ultra-low temperature resistant rigid polyurethane foam insulation material is a new type of material that has attracted more attention in research and application at home and abroad in recent years. It has huge demand in aerospace, energy, food, medical and other fields, especially in the field of LNG insulation materials; this material Ultra-low temperature resistance and flame retardancy are required; it can effectively prevent the heat loss of ultra-low temperature liquid. In recent years, although a lot of research has been carried out in this area at home and abroad, and certain progress and results have been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08K3/32C08K5/49C08G18/08C08L75/08B29C44/00C08G101/00
Inventor 高延敏张天财
Owner JIANGSU UNIV OF SCI & TECH
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