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Self-repairing linear polyurethane and preparation method thereof

A linear polyurethane self-healing technology, applied in the field of polymer materials, can solve the problems of increasing the consumption of polyurethane raw materials, easily producing cracked appearance, and destroying the ecological environment, etc., and achieves the effects of wide range of use effects, long service life, and protection of the ecological environment

Inactive Publication Date: 2020-06-30
GUIZHOU MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, products made of polyurethane are prone to cracks or surface damage after long-term use, so the product often needs to be repaired or replaced, which greatly increases the consumption of polyurethane raw materials, and at the same time, there is a lot of waste of polyurethane after use , destroy the ecological environment

Method used

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  • Self-repairing linear polyurethane and preparation method thereof
  • Self-repairing linear polyurethane and preparation method thereof
  • Self-repairing linear polyurethane and preparation method thereof

Examples

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Embodiment 1

[0044] This embodiment provides a method for preparing self-healing linear polyurethane, comprising the following steps:

[0045] S1. Place the polypropylene glycol at 120°C for 2 hours in a vacuum, dry the DMF over anhydrous magnesium sulfate, take 15g of polypropylene glycol, add it to a four-necked round-bottomed flask, pass nitrogen gas into the four-necked round-bottomed flask, and then take 10g of TDI was added to 5ml of DMF, heated to 50°C to dissolve, and the solution was obtained after the TDI was completely melted.

[0046] S2. Add PPG with a number average molecular weight of 2000 to the dissolving solution obtained in step S1 according to the ratio of group n-NCO to group n-OH of 2.0. Under protection, the reaction was stirred for 15 min to obtain an intermediate, which has -NCO capping. The end point of the reaction was determined by the toluene-di-n-butylamine method. When the -NCO group content reaches the theoretical value, it can be judged that the end of th...

Embodiment 2

[0053] This embodiment provides a method for preparing self-healing linear polyurethane, comprising the following steps:

[0054] S1. Place the polypropylene glycol at 120°C for 2 hours in a vacuum, dry the DMF over anhydrous magnesium sulfate, take 15g of polypropylene glycol, add it to a four-necked round-bottomed flask, pass nitrogen gas into the four-necked round-bottomed flask, and then take Add 10g of TDI to 5ml of DMF and heat to 55°C to dissolve. After the TDI is completely melted, a solution is obtained.

[0055] S2. Add PPG with a number average molecular weight of 2000 to the dissolving solution obtained in step S1 according to the ratio of group n-NCO to group n-OH of 2.0, the amount of PPG added is 40g, the temperature is raised to 70°C, Under protection, the reaction was stirred for 15 min to obtain an intermediate, which has -NCO capping. The end point of the reaction was determined by the toluene-di-n-butylamine method. When the -NCO group content reaches the...

Embodiment 3

[0062] This embodiment provides a method for preparing self-healing linear polyurethane, comprising the following steps:

[0063] S1. Place the polypropylene glycol at 120°C for 2 hours in a vacuum, dry the DMF over anhydrous magnesium sulfate, take 15g of polypropylene glycol, add it to a four-necked round-bottomed flask, pass nitrogen gas into the four-necked round-bottomed flask, and then take 10g of TDI was added to 5ml of DMF, heated to 45°C to dissolve, and the solution was obtained after the TDI was completely melted.

[0064] S2. Add PPG with a number average molecular weight of 2000 to the dissolving solution obtained in step S1 according to the ratio of group n-NCO to group n-OH of 2.0. Under protection, the reaction was stirred for 14 minutes to obtain an intermediate, which has an -NCO capping group. The end point of the reaction was determined by the toluene-di-n-butylamine method. When the -NCO group content reaches the theoretical value, it can be judged that ...

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Abstract

The invention relates to self-repairing linear polyurethane and a preparation method thereof, and belongs to the technical field of high polymer materials. The preparation method comprises the following steps: taking polypropylene glycol and TDI, adding DMF, heating to 40-60 DEG C, and dissolving to obtain a dissolved solution; adding PPG into an obtained dissolving solution, heating the temperature to 65-85 DEG C, carrying out a stirring reaction for 12-18 min under the protection of nitrogen, and thus obtaining an intermediate; taking out the intermediate, cooling to 0 DEG C, adding furfurylamine, carrying out a reaction for 25-40 min, and recovering to room temperature to obtain a polyurethane prepolymer; and adding bismaleimide into the obtained polyurethane prepolymer, carrying out areaction for 24 h at a temperature of 75-85 DEG C, and taking out the obtained reaction product to obtain the self-repairing linear polyurethane. The invention also provides the self-repairing linearpolyurethane. According to the preparation method of the self-repairing linear polyurethane, the self-repairing linear polyurethane can be efficiently prepared, and the prepared self-repairing linearpolyurethane is good in self-repairing effect.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a self-repairing linear polyurethane and a preparation method thereof. Background technique [0002] Polyurethane is a widely used polymer material, which has the advantages of light weight, good stability, good chemical resistance, excellent resilience and small compression set. So it is widely used in packaging, sound insulation, construction and automobile and other fields. [0003] However, products made of polyurethane are prone to cracks or surface damage after long-term use, so the product often needs to be repaired or replaced, which greatly increases the consumption of polyurethane raw materials, and at the same time, there is a lot of waste of polyurethane after use , destroying the ecological environment. [0004] Therefore, there is an urgent need for a polyurethane polymer material that can repair itself. Contents of the invention [0005] ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/12C08G18/28C08G18/48C08G18/32
CPCC08G18/12C08G18/2865C08G18/4825C08G18/6685C08G18/3846
Inventor 张道海谭芳何敏宝冬梅秦舒浩罗迎春于杰
Owner GUIZHOU MINZU UNIV
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