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Polyurethane rigid foam for covering austenitic stainless steel and preparation method thereof

A technology of rigid foam plastics and austenitic stainless steel, applied in the field of thermal insulation materials, can solve the problems of stainless steel stress corrosion cracking, high content of leached chloride ions, etc., to prevent flame spread, reduce free chloride ions, and good toughness Effect

Active Publication Date: 2021-11-23
南京红宝丽新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem in the prior art that the polyurethane rigid foam used for austenitic stainless steel equipment and pipeline insulation has a high content of soluble chloride ions, which may easily cause stress corrosion cracking of stainless steel, the present invention firstly provides a polyurethane foam for covering austenitic stainless steel rigid foam

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1.10 parts of nano silver are dissolved in 2.5 parts of water by weight to obtain nano silver aqueous solution, wherein the particle diameter of nano silver is 30-50nm; 55 parts of polyester polyol PS-3152 (Stepan), 45 parts of poly Ether polyol H4110 (Red Polaroid), 1.6 parts of dimethylcyclohexylamine, 1.4 parts of TMR-2 (Evonik), 7 parts of cyclopentane, 3.6 parts of nano-silver aqueous solution, 2.0 parts of foam stabilizer B8544 (Evonik ) and 10 parts of aluminum hydroxide are added into the reactor and stirred and mixed evenly to obtain component A; 157 parts of polyphenyl polymethylene polyisocyanate M20S (Basf) are taken by weight to obtain component B; component A and component The weight ratio of B is 1:1.25;

[0040] Quickly stir and mix component A and component B evenly, and pour the mixture into the mold to solidify and form. The preheating temperature of the mold is 45°C. After pouring the mixed material into the mold, stop heating the mold, and use the ...

Embodiment 2

[0045] Dissolve 0.05 parts of silver nitrate in 1.5 parts of water by weight to obtain an aqueous solution of silver nitrate; by weight, 50 parts of polyester polyol AK-POL1001 (Ai Jing), 50 parts of polyether polyol HP2502 (Hongbaoli), 1.8 parts Triethylenediamine, 1.2 parts of TMR-2 (Evonik), 7 parts of cyclopentane, 5 parts of HFC-365mfc, 1.55 parts of silver nitrate aqueous solution, 2.0 parts of foam stabilizer AK8830 (Mester) and 10 parts of methyl Add dimethyl phosphate, 15 parts of triethyl phosphate, and 5 parts of ammonium polyphosphate into the reactor and stir and mix evenly to obtain component A; take 186 parts of polyphenyl polymethylene polyisocyanate M200 by weight (Kumho Mitsui) , to get component B; the weight ratio of component A to component B is 1:1.25;

[0046] Quickly stir and mix component A and component B evenly, and pour the mixture into the mold to solidify and form. The preheating temperature of the mold is 42°C. After pouring the mixed material i...

Embodiment 3

[0050] Dissolve 0.30 parts of silver nitrate by weight in 2.0 parts of water to obtain an aqueous solution of silver nitrate; 30 parts of polyether polyol HP3201 (Hongbaoli), 1.8 parts of dimethylethanolamine, 2.8 parts of TMR-18 (Evonik), 0.9 parts of JXP509 (Evonik), 20 parts of HFC-245fa, 2.3 parts of silver nitrate aqueous solution, 3.5 parts of foam stabilizer Niax L-5440 (Momentive) and 10 parts of expandable graphite are added into the reactor and stirred and mixed evenly to obtain component A; 226 parts of polyphenyl polymethylene polyisocyanate PM-200 ( Wanhua Chemical) to obtain component B; the weight ratio of component A to component B is 1:1.6;

[0051] Quickly stir and mix component A and component B evenly, and pour the mixture into the mold to solidify and form. The preheating temperature of the mold is 50°C. After pouring the mixed material into the mold, stop heating the mold, and use the residual heat of the mold to complete the molding of polyurethane rigi...

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Abstract

The invention discloses a polyurethane rigid foam plastic for covering austenitic stainless steel, which is prepared from component A and component B. Component A consists of 100 parts by weight of polyol, 3.0-5.5 parts of amine catalyst, physical hair 7-20 parts of foam agent, 1.5-2.5 parts of water, 2.0-3.5 parts of foam stabilizer and 0.05-1.10 parts of chloride ion scavenger; component B is polyphenyl polymethylene polyisocyanate; the polyurethane rigid The leached chloride ion content of foamed plastics is ≤45mg / kg. The preparation method is as follows: uniformly mix the materials in component A to obtain component A; stir and mix component A and component B uniformly to obtain a mixed material, and pour the mixed material into a mold to solidify and form it. The foamed plastic in this application can basically avoid corrosion of stainless steel due to the influence of chloride ions in the insulation material, and reduce the harm caused by the factors of chloride ions in the insulation material.

Description

technical field [0001] The invention relates to a rigid polyurethane foam plastic for covering austenitic stainless steel and a preparation method thereof, which belongs to the field of thermal insulation materials. Background technique [0002] Austenitic stainless steel is widely used in petroleum, chemical, pharmaceutical, food, nuclear energy and other industries due to its special structure, corrosion resistance, high temperature resistance, no rust, and no pollution to materials. In order to save energy and keep heat, most stainless steel equipment - tanks, kettles, towers, pipes, pumps, valves, etc. need to be covered with insulation materials. The Achilles' heel of stainless steel is fear of chlorides. When stainless steel is exposed to weak corrosive media such as general atmosphere, steam and water, there is no residence and accumulation of chlorides, and generally it will not rust. Under the environment of temperature, humidity and oxygen content, the insulation...

Claims

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Application Information

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IPC IPC(8): C08G18/42C08G18/48C08K3/08C08K3/22C08J9/14C08L75/06
CPCC08G18/4018C08G18/42C08G18/48C08J9/141C08J2203/14C08J2205/10C08J2375/06C08K3/08C08K3/22C08K2003/0806C08K2003/2227C08K2201/003C08K2201/011
Inventor 袁海顺祝丽娟邢小刚潘婵娟夏淳元
Owner 南京红宝丽新材料有限公司
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