Self-folding structure-containing polyurethane and preparation method thereof

A polyurethane and self-folding technology, which is applied in the field of polyurethane, can solve problems such as the decline in mechanical properties of polyurethane and insufficient hydrogen bonding in rigid segments, and achieve the effects of improved mechanical properties and simple preparation methods

Active Publication Date: 2016-10-12
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, polyurethane materials are synthesized by a two-step method of diisocyanate and oligomer polyols. The special structure produced by microphase separation endows polyurethane with good mechanical properties, but the lack of hydrogen bonding in the rigid segment often leads to a decline in the mechanical properties of polyurethane. question

Method used

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  • Self-folding structure-containing polyurethane and preparation method thereof
  • Self-folding structure-containing polyurethane and preparation method thereof
  • Self-folding structure-containing polyurethane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Add 10g of 1,5-naphthalene diisocyanate and 5.81g of ethanolamine into 100ml of N,N-dimethylformamide, continue to stir and react at room temperature for 0.5h, filter with suction and dry to obtain a hydroxyl-terminated naphthalene ring chain extender.

[0044] Characterized by H NMR spectrum, the NMR data are as follows:

[0045] δ / ppm=3.16-3.25(m,2H),3.45-3.58(m,2H),4.76-4.84(m,2H),6.71-6.79(m,2H),7.39-7.48(m,2H),7.71 -7.77(d,J=8.55Hz,2H),7.99-8.05(d,J=7.77Hz,2H),8.55(s,2H).

[0046] The product obtained is of formula I:

[0047]

[0048] Add 10 g of pyromellitic dianhydride and 5.0 g of ethanolamine into 100 ml of N,N-dimethylformamide, stir and react at room temperature for 12 hours to generate an amic acid solution, add 30 ml of toluene to the above amic acid solution, and raise the temperature to At 170°C, the water generated by the cyclization of amic acid is continuously separated through the water separator. When the separated water reaches the metered val...

Embodiment 2

[0060] Add 10g of 1,5-naphthalene diisocyanate and 7.14g of ethanolamine into 100ml of N,N-dimethylacetamide, continue to stir and react at room temperature for 0.5h, filter with suction, and dry to obtain a hydroxyl-terminated naphthalene ring chain extender. The product structure is as formula III:

[0061]

[0062] Add 10g of pyromellitic dianhydride and 6.9g of propanolamine into 100ml of N,N-dimethylacetamide, stir and react at room temperature for 12h to generate an amic acid solution, add 30ml of toluene to the above-mentioned amic acid solution, and lower the temperature Raise to 170°C, and continuously separate the water generated by the cyclization of amic acid through the water separator. After the separated water reaches the metered value, stop the reaction, and remove the toluene and N,N-dimethylacetamide in the system by distillation under reduced pressure , drying to obtain a hydroxyl-terminated imide ring chain extender, and the obtained product structure is...

Embodiment 3

[0069] Add 10g of 1,5-naphthalene diisocyanate and 5.81g of ethanolamine into 100ml of dimethyl sulfoxide, continue to stir and react at room temperature for 0.5h, filter with suction, and dry to obtain a hydroxyl-terminated naphthalene ring chain extender. The structure of the obtained product is as follows: V:

[0070]

[0071] Add 10g of pyromellitic dianhydride and 5.0g of ethanolamine into 100ml of N,N-dimethylacetamide, stir and react at room temperature for 12 hours to generate an amic acid solution, add 30ml of toluene to the above amic acid solution, and raise the temperature to 170 ℃, the water generated by the cyclization of amic acid is continuously separated through the water separator. When the separated water reaches the measured value, the reaction is stopped, the toluene and N,N-dimethylformamide in the system are removed by vacuum distillation, and dried Obtain the imide ring chain extender of hydroxyl termination, the product of gained is such as formula ...

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Abstract

The invention relates to a self-folding structure-containing polyurethane. The self-folding structure-containing polyurethane is prepared from 1,5-diisocyanatonaphthalene, pyromellitic dianhydride, diisocyanate, hydramine and an oligomer dihydric alcohol. Compared with traditional elastomer materials, the self-folding structure-containing polyurethane prepared in the invention has greatly increased elasticity, modulus, strength, elongation at break and other mechanical performances, and has potential application in the mechanical field and the chemical engineering field. A preparation method of the self-folding structure-containing polyurethane has the advantages of simplicity, easiness in enforcement and control, and high production efficiency.

Description

technical field [0001] The invention relates to the field of polyurethane, in particular to a polyurethane with a self-folding structure and a preparation method thereof. Background technique [0002] Polyurethane material is currently the best performance insulation material in the world. A class of polymers whose main chain contains -NHCOO- repeating structural units, which are polymerized from isocyanates (monomers) and hydroxyl compounds. Due to the strong polar carbamate group, insoluble in non-polar groups, it has good oil resistance, toughness, wear resistance, aging resistance and adhesion. Materials suitable for a wide temperature range (-50 to 150°C) can be prepared with different raw materials, including elastomers, thermoplastic resins and thermosetting resins. It is not resistant to hydrolysis at high temperature, nor to alkaline medium. [0003] Commonly used monomers such as toluene diisocyanate, diisocyanate diphenylmethane, etc. Polyols are divided into ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/73C08G18/75C08G18/48C08G18/32C08G18/10C08G18/76C08G18/42
CPCC08G18/10C08G18/4854C08G18/73C08G18/755C08G18/3846C08G18/3829
Inventor 王玉彬徐伟刘伟王静刚张若愚朱锦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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