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Polyurethane/epoxy resin blend with shape memory, self-repairing and recyclability functions and preparation method thereof

An epoxy resin and polyurethane technology, which is applied in the field of polyurethane/epoxy resin blends and their preparation, can solve the problems of inability to take into account self-healing, low strength of TPU materials, etc., and achieve self-healing and recycling performance improvement and mechanical performance enhancement. , the effect of improving mechanical properties

Active Publication Date: 2019-10-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: In view of the problems that the performance improvement method of TPU material in the prior art cannot take into account self-repair, shape memory and recyclability, and the strength of the TPU material obtained by the existing improvement method is low, the present invention provides a polyurethane / epoxy resin blend The blend has excellent shape memory, self-healing and recyclable properties; in addition, the present invention also provides a preparation method of the polyurethane / epoxy resin blend

Method used

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  • Polyurethane/epoxy resin blend with shape memory, self-repairing and recyclability functions and preparation method thereof
  • Polyurethane/epoxy resin blend with shape memory, self-repairing and recyclability functions and preparation method thereof
  • Polyurethane/epoxy resin blend with shape memory, self-repairing and recyclability functions and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh 14.466g of polycarbonate diol with a molecular weight of 1000 and heat and melt it, and dissolve 7.235g of isophorone diisocyanate and 0.042g of dibutyltin dilaurate in 20g of N,N-dimethylformamide and added dropwise to polycarbonate diol, stirred and reacted at 70°C for 3 hours to obtain a polyurethane prepolymer;

[0028] (2) Dissolve 0.449g of 4,4'-diaminodiphenyl disulfide and 0.021g of dibutyltin dilaurate in 20g of N,N-dimethylformamide, and add them dropwise to step (1) In the obtained polyurethane prepolymer, stirring and reacting at a temperature of 70° C. for 4 hours to obtain a TPU material whose main chain contains a disulfide bond;

[0029] (3) Dissolve 24g of epoxy resin and 6.848g of furfurylamine in 40g of N,N-dimethylformamide, stir and react at 100°C for 6h to obtain an epoxy resin prepolymer;

[0030] (4) Dissolve the TPU (7g) obtained in step (2) and the epoxy resin prepolymer (2.129g) obtained in step (3) in 40g N,N-dimethylformamide and ...

Embodiment 2

[0033] (1) Weigh 14.466g of polycarbonate diol with a molecular weight of 1000 and heat and melt it, and dissolve 7.235g of isophorone diisocyanate and 0.042g of dibutyltin dilaurate in 20g of N,N-dimethylformamide and added dropwise to polycarbonate diol, stirred and reacted at 70°C for 3 hours to obtain a polyurethane prepolymer;

[0034] (2) Dissolve 0.449g of 4,4'-diaminodiphenyl disulfide and 0.021g of dibutyltin dilaurate in 20g of N,N-dimethylformamide, and add them dropwise to step (1) In the obtained polyurethane prepolymer, stirring and reacting at a temperature of 70° C. for 4 hours to obtain a TPU material whose main chain contains a disulfide bond;

[0035] (3) Dissolve 24g of epoxy resin and 6.848g of furfurylamine in 40g of N,N-dimethylformamide, stir and react at 100°C for 6h to obtain an epoxy resin prepolymer;

[0036] (4) Dissolve the TPU (7g) obtained in step (2) and the epoxy resin prepolymer (2.129g) obtained in step (3) in 40g N,N-dimethylformamide and ...

Embodiment 3

[0039] The method for preparing polyurethane / epoxy resin blend with reference to embodiment 2, difference is that step (4): with step (2) gained TPU (7g) and step (3) gained epoxy resin prepolymer (2.129g) dissolve In 40g N,N-dimethylformamide, stir evenly at 70°C, and add 0.871g 4,4'-methylenebis(N-phenylmaleimide) at room temperature, stir After uniformity, it is poured into a mold and dried at a temperature of 70° C. to obtain a multifunctional polyurethane / epoxy resin blend.

[0040] The self-repair, shape memory performance test and mechanical performance test before and after recovery of the blend are carried out as follows: the prepared blend sample is cut in the middle with a sharp blade, and the samples are respectively tested at 120 ° C and 150 ° C After heating and repairing for 6 hours, the sample was heat-treated at 60°C for 72 hours before tensile testing, and the repairing effects of the tensile test reached 23.59% and 27.32% respectively; the sample was heated ...

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Abstract

The invention discloses a polyurethane / epoxy resin blend with shape memory, self-repairing and recyclability functions and a preparation method thereof. The polyurethane / epoxy resin blend is a homogeneous blend of polyurethane and epoxy resin or a two-phase phase separation blend formed by mixing the polyurethane and the epoxy resin and then performing crosslinking and curing with a curing agent,wherein the polyurethane is a linear polyurethane material containing a disulfide bond in the main chain, the epoxy resin is an epoxy resin pre-polymer with a side group containing a furan ring, and the curing agent contains a maleimide group. The preparation method of the polyurethane / epoxy resin homogeneous blend is as follows: dissolving the polyurethane and the epoxy resin pre-polymer in an organic solvent, performing stirring and blending at a temperature of 60-80 DEG C, and performing drying at a temperature of 60-80 DEG C after uniform stirring to obtain the blend. The shape memory, self-repairing and recovery characteristics of a polyurethane material are improved by a blending method, mechanical properties of polyurethane are enhanced at room temperature, and recyclability of thepolyurethane at high temperature is not affected.

Description

technical field [0001] The invention relates to a material with shape memory, self-repair and recyclable functions, in particular to a recyclable polyurethane / epoxy resin blend and a preparation method thereof, which can simultaneously realize shape memory and self-repair functions, It belongs to the field of polymer materials. Background technique [0002] In the past two decades, polymers with variable shape or long service life have received much attention. Polymer materials that can change shape under stimulation have a wide range of applications in biomedical devices, aerospace engineering, microfluidic chips, and soft actuators. At the same time, polymer materials have self-healing ability after damage and are recyclable after being discarded, which can reduce the crisis of energy, resources and waste. There is no doubt that it is important to prepare polymers with shape memory, self-healing, and recyclable properties: because it has the ability to change shape in sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08L63/00C08J3/24C08G18/66C08G18/44C08G18/32C08G18/10
CPCC08L75/04C08J3/246C08G18/6651C08G18/44C08G18/3243C08G18/10C08J2375/04C08J2463/00C08L2201/12C08L63/00
Inventor 方亮陈天琪王帅陆春华许仲梓
Owner NANJING UNIV OF TECH
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