High-strength self-repairing polyurethane material and preparation method thereof

A polyurethane material and self-healing technology, applied in the fields of coatings, flexible electronics, and synthetic rubber, can solve problems such as poor reactivity, high reaction temperature, and poor toughness, and achieve the effect of easy reprocessing

Active Publication Date: 2021-10-19
NORTHWESTERN POLYTECHNICAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of poor toughness caused by aromatic disulfides, the self-healing polyurethane in this invention uses some aliphatic disulfides (3,3-dithiodipropionic acid), but the reaction between isocyanate groups and carboxyl groups The activity is relatively poor with primary amines and alcoholic hydroxyl groups, so the reaction temperature is higher

Method used

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  • High-strength self-repairing polyurethane material and preparation method thereof
  • High-strength self-repairing polyurethane material and preparation method thereof
  • High-strength self-repairing polyurethane material and preparation method thereof

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preparation example Construction

[0031] Preparation method of the present invention (taking cystamine as example, see attached figure 1 ):

[0032] Put 100 parts by mass of IPDI into the reactor, add 0.3-0.7 parts of low molecular weight PTMEG in molar ratio, heat up to 75°C for 2 hours, add cystamine in molar ratio of 0.75-0.35 parts, water bath (12-18°C), ultrasonic , mechanical stirring (300 ~ 500r / min), N 2 The polymer of the present invention can be obtained after reacting for 4 hours under protection.

Embodiment 1

[0034] Add PTMEG-1000 (15g), IPDI (6.67g), DBTDL (0.08g) into a 500mL three-neck flask, add 5mLN,N-dimethylacetamide (DMAc) to dissolve the reactants, and put them at 75°C under N 2 Under the atmosphere, mechanically stirred for 2 hours to obtain a colorless solution, which was a prepolymer. After obtaining the prepolymer, the three-necked flask was placed in a water bath and cooled to 15°C, and the chain extender cystamine (2.29g) dissolved in 160mL DMAc was added dropwise to the container, and heated under N 2 After mechanically stirring for 4 hours under the atmosphere, a colorless, transparent and viscous DMAc solution of self-healing polyurethane was obtained, and the self-healing polyurethane could be obtained after drying. The self-healing polyurethane has a tensile strength of 37.1MPa, an elongation at break of 1080%, and a light transmittance of 90%. The tensile strength can recover 96.8% after being treated at 80°C for 4 hours.

Embodiment 2

[0036] PTMEG-1000 (15g), IPDI (6.67g), DBTDL (0.08g) were added in a 500mL three-necked flask, and 5mLDMAc was added to dissolve the reactant, and at 75°C, N 2 Under the atmosphere, mechanically stirred for 2 hours to obtain a colorless solution, which was a prepolymer. After obtaining the prepolymer, the three-neck flask was placed in a water bath and cooled to 15 ° C, and the chain extender 3,3-dithiodipropylamine (2.71 g) dissolved in 160 mL of DMAc was added dropwise to the container, and in N 2After mechanically stirring for 4 hours under the atmosphere, a colorless, transparent and viscous DMAc solution of self-healing polyurethane was obtained, and the self-healing polyurethane could be obtained after drying. The self-healing polyurethane has a tensile strength of 33.75MPa, an elongation at break of 1146%, and a light transmittance of 89%. The tensile strength can recover 95.4% after being treated at 80°C for 4 hours.

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Abstract

The invention relates to a high-strength self-repairing polyurethane material and a preparation method thereof. The high-strength self-repairing polyurethane material is a tough and recyclable polyurethane elastomer with rapid and efficient self-repairing capability. According to the invention, compared with the existing self-repairing elastomer and hydrogel with low strength (generally less than 10MPa) and poor toughness, the high-strength self-repairing polyurethane material has higher practical application value due to high strength and high toughness; the elastomer is composed of a soft segment, a hard segment and a chain extender, wherein hydrogen bonds, disulfide bonds and soft / hard segment microphase separation in the elastomer can achieve a synergistic effect, so that the elastomer has high strength and excellent self-repairing characteristics at the same time; the preparation method of the self-repairing polyurethane elastomer is simple and easy to implement; and due to the fact that the self-repairing polyurethane elastomer is high in strength, good in toughness, high in transparency, high in self-repairing efficiency and capable of being recycled, the self-repairing polyurethane elastomer has potential application prospects in the aspects of synthetic rubber, coating, flexible electronics and the like.

Description

technical field [0001] The invention belongs to a high-strength self-repairing material, relates to a high-strength self-repairing polyurethane material and a preparation method thereof, and can be applied to fields such as synthetic rubber, coatings, and flexible electronics. Background technique [0002] Polyurethane materials have low temperature resistance, good flexibility, strong adhesion, large degree of freedom in structural design, and wide range of performance adjustments. They have great application potential in the field of flexible electronics. However, the existing polyurethane materials generally have mechanical properties and self-healing Due to the conflict between resilience, it is difficult to balance high strength, high elongation at break and high self-healing efficiency. With the rapid development of flexible electronic devices, the existing polyurethane materials have been difficult to meet the requirements. In the future, flexibility, toughness, sel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/10C08G18/32
CPCC08G18/755C08G18/6666C08G18/4854C08G18/10C08G18/3863
Inventor 郑亚萍谢金良范玲姚东东党精甲
Owner NORTHWESTERN POLYTECHNICAL UNIV
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