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Intrinsic black polyurethane with near-infrared photothermal effect and its preparation and application

A near-infrared light and thermal effect technology, applied in the field of functional polymer materials, can solve the problems of cumbersome preparation process, and achieve the effects of excellent mechanical properties, fast and efficient welding, and triggering dynamic exchange.

Active Publication Date: 2022-03-22
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Rowan of Case Western Reserve University in the United States reported a class of disulfide bond-based polymers that can be repaired by ultraviolet light. .2013,2,694-699); Matyjaszewski reported a class of visible light-responsive thiuram disulfide bonds, which can endow materials with good self-healing properties under visible light stimulation, but the fracture strength and highest modulus of the prepared materials Only 2.0±0.3MPa, 10.8±1.3MPa respectively (Adv.Mater.2012, 24, 3975–3980)
Therefore, it is challenging to realize the plasticization, processability, weldability and functionalization of high-strength, high-modulus thermosetting resins through photostimulation.

Method used

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  • Intrinsic black polyurethane with near-infrared photothermal effect and its preparation and application
  • Intrinsic black polyurethane with near-infrared photothermal effect and its preparation and application
  • Intrinsic black polyurethane with near-infrared photothermal effect and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The raw material of the intrinsic black polyurethane in this embodiment includes: 35.4 parts by mass of THDI, 14.6 parts by mass of p-benzoquinonedioxime, and no polyurethane catalyst is added.

[0030] The steps of the preparation method of this embodiment include:

[0031] After mixing 35.4 parts by mass of THDI and 14.6 parts by mass of p-benzoquinone dioxime, no catalyst is added, stirred evenly by hand with a glass rod, then added to the internal mixer, and the temperature of the internal mixer is increased to 80°C for internal mixing After 6 hours, a brown powder material was obtained, and the powder material was hot-pressed in a flat vulcanizer under the conditions of 140° C., 5 MPa, and 45 min, to obtain a uniform intrinsic black film.

[0032] Its stress-strain curve is shown in figure 1 shown. It is in glass state at room temperature, its modulus can reach about 1GPa, and its fracture strength can reach 40MPa. See figure 1 and Table 1.

[0033] The film c...

Embodiment 2

[0037] The intrinsically black polyurethane of this embodiment includes raw materials: 35.4 parts by mass of THDI, 0.5 parts by mass of DBTDL, and 14.6 parts by mass of p-benzoquinonedioxime.

[0038]The steps of the preparation method in this example include: mixing 35.4 parts by mass of THDI and 0.5 parts by mass of DBTDL, stirring with a glass rod for 5 minutes, adding 14.6 parts by mass of p-benzoquinonedioxime, and continuing to manually stir with a glass rod Finally, add it to the internal mixer, increase the temperature of the internal mixer to 70°C, and carry out internal mixing for 7 hours to obtain a brown powder material; the powder material is hot-pressed in a flat vulcanizer, and the hot-pressing condition is 150°C, 4.5MPa, After 40 min, a uniform intrinsic black film was obtained. Its stress-strain curve is shown in figure 1 shown.

[0039] The film can be applied in the field of thermosetting resin photowelding and shape memory recovery, and has a significant ...

Embodiment 3

[0041] The intrinsic black polyurethane of the present embodiment has the same raw material components as in the second embodiment.

[0042] The steps of the preparation method in this example include: mixing 35.4 parts by mass of THDI and 0.5 parts by mass of U600, stirring with a glass rod for 5 minutes, adding 14.6 parts by mass of p-benzoquinonedioxime, and continuing to manually stir with a glass rod Finally, add it to the internal mixer, increase the temperature of the internal mixer to 60°C, and carry out internal mixing for 5 hours; obtain a brown powder material; hot press the powder material in a flat vulcanizer, and the hot pressing condition is 160°C, 6MPa, 35min A uniform intrinsically black film was obtained. Its stress-strain curve is shown in figure 1 shown.

[0043] The film can be applied in the field of thermosetting resin photowelding and shape memory recovery, and has a significant photothermal effect under near-infrared light irradiation. The large amo...

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Abstract

Intrinsic black polyurethane with near-infrared photothermal effect and its preparation and application, raw materials and synthesis: After mixing multifunctional isocyanate and polyurethane catalyst evenly, add p-benzoquinone dioxime with the same functionality as isocyanate group to ensure The total number of moles of oxime functional groups in the system is equal to the number of moles of isocyanate groups, forming a highly cross-linked polymer network; put the mixed system into an internal mixer, and carry out internal mixing at 60-80°C for 4-10 hours to obtain a brown powder Material, the powder material is hot-pressed in a flat vulcanizer, the hot-pressing condition is 140-160 ° C, 4-6 MPa for 30-50 minutes, and a uniform intrinsic black film is obtained; the film is irradiated by near-infrared light Under the environment, it has a significant photothermal effect, and the large amount of heat generated after illumination can trigger the dynamic dissociation and reorganization of the dynamic oxime urethane bond, so that the cross-linked polyurethane can achieve fast and efficient welding and shape memory recovery, which can be applied in welding and The field of shape memory recovery.

Description

technical field [0001] The invention relates to the field of functional polymer materials, in particular to an intrinsic black polyurethane with near-infrared photothermal effect and its preparation and application. Background technique [0002] Traditional thermosetting resins exhibit excellent mechanical properties, heat resistance, solvent resistance, etc. due to highly stable chemical crosslinking. However, thermosetting resins cross-linked by stable covalent bonds cannot be reshaped once the material is cured due to too stable chemical cross-linking, which leads to serious energy loss and environmental pollution. Dynamic covalent bonds are a type of chemical bonds that can undergo breakage and recombination processes under appropriate external stimulus conditions. Compared with traditional stable chemical crosslinks, it has lower covalent bond energy. Thus endowing covalently bonded polymers with good remodelability, healability, weldability, recyclability, etc. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/38C08J5/18C08L75/04
CPCC08G18/3819C08J5/18C08J2375/04
Inventor 张彦峰陈兴幸
Owner XI AN JIAOTONG UNIV
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