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High-damping modified polyurethane material and preparation method thereof

A polyurethane material and high damping technology, which is applied in the field of preparation of high damping shock-isolation bearings, can solve problems such as difficult glass transition temperature, complicated preparation process, difficult to control material compatibility, etc., and achieve easy compatibility and dispersion , simple process, excellent mechanical properties

Pending Publication Date: 2019-02-01
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Among the prepared polyurethane materials, the damping loss factor can reach a maximum of 1.4, but the material compatibility is difficult to control; when the damping loss factor and temperature range meet the requirements, the glass transition temperature is much lower than normal temperature; when the damping performance is better , the preparation process is more complicated, usually requires high temperature mixing or vulcanization or low temperature quenching process
That is, it is difficult to meet the requirements of damping loss factor, temperature range, glass transition temperature, and simple process at the same time, so high-damping polyurethane materials have not been widely used in seismic isolation bearings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a three-neck flask equipped with a condensing reflux tube, a stirrer and a thermometer, add 40 parts of polyester diol to seal the device, set the temperature of the oil bath to 120° C., and turn on the vacuum pump for dehydration for 2 hours. When the water content is lower than 0.1%, turn off the vacuum pump, add 5 parts of pretreated graphene, stir (150r / min), and turn on the vacuum pump to evacuate. After the temperature drops to 80°C, turn off the vacuum pump and turn on N 2, add 20 parts of isophorone diisocyanate, stir (250r / min) for 2 hours and then stop the reaction to obtain a polyurethane prepolymer of polyester diol. Weigh 20 parts of epoxy resin and 16 parts of curing agent in a three-necked flask, set the oil bath temperature to 80°C and stir (250r / min) for 3h, add 50 parts of end-NCO polyurethane prepolymer, continue stirring (250r / min ) 2h. Add 20 parts of hindered phenol, mechanically stir (300r / min) for 30min, add 0.5 part of curing accelerator, s...

Embodiment 2

[0020] In a three-neck flask equipped with a condensing reflux tube, a stirrer and a thermometer, add 40 parts of polyester diol to seal the device, set the temperature of the oil bath to 120° C., and turn on the vacuum pump for dehydration for 2 hours. When the water content is lower than 0.1%, turn off the vacuum pump, add 5 parts of pretreated graphene, stir (150r / min), and turn on the vacuum pump to evacuate. After the temperature drops to 80°C, turn off the vacuum pump and turn on N 2 , add 10 parts of isophorone diisocyanate and 20 parts of hindered phenol, mechanically stir (300r / min) for 2 hours, stop the reaction, and obtain a hindered phenol-terminated polyurethane prepolymer. Weigh 20 parts of epoxy resin and 16 parts of curing agent in a three-necked flask, set the oil bath temperature to 80°C and stir (250r / min) for 3h, add 50 parts of hindered phenol-terminated polyurethane prepolymer, and continue stirring (250r / min) min) 2h. Weigh 50 parts of hindered phenol-...

Embodiment 3

[0021] In a three-necked flask equipped with a condensing reflux tube, a stirrer and a thermometer, add 30 parts of polyester diol to seal the device, set the temperature of the oil bath to 110°C, stir (150r / min), and turn on the vacuum pump for dehydration for 2 hours. When the water content is lower than 0.1%, turn off the vacuum pump, add 5 parts of pretreated graphene, stir (150r / min), and turn on the vacuum pump to evacuate. After the temperature drops to 80°C, turn off the vacuum pump and turn on N 2 , add 15 parts of isophorone diisocyanate, stir (250r / min) for 1.5h and then stop the reaction to obtain a polyurethane prepolymer of polyester diol. Weigh 20 parts of epoxy resin and 15 parts of curing agent in a three-necked flask, set the oil bath temperature to 80°C and stir (250r / min) for 3h, add 40 parts of end-NCO polyurethane prepolymer, continue stirring (250r / min ) 2h. Set the temperature of the oil bath to 70°C, add 0.2 parts of triethylamine (catalyst), add 18 ...

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Abstract

The invention discloses a high-damping modified polyurethane material and a preparation method thereof. The method comprises the following steps: adding graphene to polyol, introducing a terminal -NCOgroup into the molecular chain of polyurethane, then adding hindered phenol to obtain a hindered phenol-terminated polyurethane prepolymer having a good storage stability, adding a fat curing agent,and performing room-temperature curing to obtain the high-damping polyurethane material. The damping performance of the high-damping polyurethane material is greatly higher than that of a polyurethanematerial, and the method has the advantages of simple process, low cost, and no need of additional processing devices or tedious steps, and has a great prospect in the preparation of the polyurethanematerial with a high damping performance.

Description

technical field [0001] The invention relates to a high-damping modified polyurethane material and a preparation method thereof. The prepared novel polyurethane composite material is suitable for the preparation of high-damping shock-isolation bearings in the fields of structural buildings and bridges. Background technique [0002] Earthquake is a sudden natural disaster that endangers people's life and property, and my country is one of the most earthquake-prone countries in the world. Earthquakes and the secondary disasters caused by them have caused massive collapse and destruction of buildings and structures and their internal facilities, causing huge losses to human life and property. Therefore, seismic isolation and shock absorption technology has been widely used in engineering. Especially after the Wenchuan Earthquake and Yushu Earthquake, people became more aware of the seriousness of earthquake disasters, and at the same time put forward higher requirements for the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/44C08G18/32C08G18/75C08G18/12C08G18/66C08K9/00C08K3/04
CPCC08G18/12C08G18/44C08G18/664C08G18/755C08K3/042C08K9/00C08G18/3218C08G18/3228
Inventor 苏毅李婷任仕凯张冲韩煦智石雅平
Owner NANJING FORESTRY UNIV
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