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Glass-like polyurethane elastomer based on tertiary carbamate exchange, preparation method and application thereof

A polyurethane elastomer and carbamic acid technology, applied in the field of elastomers, can solve the problems of glass-like polyurethane elastomers that have not been seen, and achieve the effect of less reaction steps and good mechanical properties

Inactive Publication Date: 2020-04-07
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are relevant literature reports on glass-like polyurethane elastomers, but high conditions such as 180°C are required, and glass-like polyurethane elastomers containing tertiary alcohol carbamate structures have not yet been seen.

Method used

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  • Glass-like polyurethane elastomer based on tertiary carbamate exchange, preparation method and application thereof
  • Glass-like polyurethane elastomer based on tertiary carbamate exchange, preparation method and application thereof
  • Glass-like polyurethane elastomer based on tertiary carbamate exchange, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A glass-like polyurethane elastomer based on carbamic acid tertiary alcohol transesterification and a preparation method thereof. The preparation method described in this embodiment is:

[0036] Dehydrating 54-60 parts by mass of polymer diol at 100°C, and then reacting with 15-20 parts by mass of diisocyanate at 50°C to obtain an isocyanate-terminated prepolymer;

[0037] The prepolymer obtained in the steps is defoamed at 50°C, then mixed with 6-12 parts by mass of polyisocyanate and 8-16 parts by mass of dibasic tertiary alcohol chain extender in a solvent, and then defoamed at 20°C. foaming, pouring, and vulcanization at a certain temperature for a certain period of time to obtain the glass-like polyurethane elastomer based on tertiary alcohol carbamate.

[0038] The polymer diol is polytetrahydrofuran ether diol, and the number average molecular weight of the polymer diol is 1000.

[0039] The diisocyanate is diphenylmethane diisocyanate.

[0040] The polyisocya...

Embodiment 2

[0049] A glass-like polyurethane elastomer based on carbamic acid tertiary alcohol transesterification and a preparation method thereof. The preparation method described in this embodiment is:

[0050] Dehydrating 49-55 parts by mass of polymer diol at 110°C, and then reacting with 20-25 parts by mass of diisocyanate at 60°C to obtain an isocyanate-terminated prepolymer;

[0051] The prepolymer obtained in the steps is defoamed at 60°C, then mixed evenly with 4 to 8 parts by mass of polyisocyanate and 12 to 18 parts by mass of dihydric tertiary alcohol chain extender in a solvent, and defoamed at 30°C. foaming, pouring, and vulcanization at a certain temperature for a certain period of time to obtain the glass-like polyurethane elastomer based on tertiary alcohol carbamate.

[0052] The polymer diol is polytetrahydrofuran ether diol, and the number average molecular weight of the polymer diol is 3000.

[0053] The diisocyanate is diphenylmethane diisocyanate.

[0054] The p...

Embodiment 3

[0063] A glass-like polyurethane elastomer based on carbamic acid tertiary alcohol transesterification and a preparation method thereof. The preparation method described in this embodiment is:

[0064] Dehydrating 45-51 parts by mass of polymer diol at 120°C, and then reacting with 20-25 parts by mass of diisocyanate at 75°C to obtain an isocyanate-terminated prepolymer;

[0065] The prepolymer obtained in the steps is defoamed at 75°C, then mixed with 6-12 mass parts of polyisocyanate and 14-20 mass parts of dibasic tertiary alcohol chain extender in a solvent, and degassed at 40°C. foaming, pouring, and vulcanization at a certain temperature for a certain period of time to obtain the glass-like polyurethane elastomer based on tertiary alcohol carbamate.

[0066] The polymer diol is polyethylene glycol, and the number average molecular weight of the polymer diol is 2000.

[0067] The diisocyanate is hexamethylene diisocyanate.

[0068] The polyisocyanate crosslinking agent...

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Abstract

Belonging to the technical field of elastomers, the invention relates to a glass-like polyurethane elastomer based on tertiary carbamate exchange, a preparation method and application thereof. The glass-like polyurethane elastomer based on tertiary carbamate exchange is prepared from the following raw materials by mass: 45-60 parts of polymer diol, 15-30 parts of diisocyanate, 2-12 parts of polyisocyanate and 8-20 parts of a chain extender, wherein the chain extender is binary tertiary alcohol. According to the invention, the binary tertiary alcohol chain extender, polyisocyanate, polymer dioland diisocyanate are adopted as the raw materials, the prepared glass-like polyurethane elastomer based on tertiary carbamate exchange has good mechanical properties and tensile strength up to 20MPa,can realize reversible exchange under the condition of no catalyst within the range of 100-120DEG C, and then reach the purpose of reprocessing or shaping, and the glass-like polyurethane elastomer can be used for flexible electronic devices and biomedical materials.

Description

technical field [0001] The invention belongs to the technical field of elastomers, and in particular relates to a glass-like polyurethane elastomer based on tertiary carbamic acid transesterification, a preparation method and an application. Background technique [0002] Polymer materials can be divided into thermoplastic materials and thermosetting materials according to their processing properties. Among them, thermoplastic materials can be repeatedly processed and used, and their heat resistance and dimensional stability are relatively poor; while thermosetting materials have excellent heat resistance, dimensional stability and mechanical strength. performance, but the cross-linked structure formed by irreversible covalent bonds makes it insoluble and infusible, making it difficult to reuse. In order to solve the contradiction between the two, exchangeable dynamic covalent bonds are introduced into the polymer material for cross-linking to obtain a glass-like polymer. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/79C08G18/76C08G18/75C08G18/66C08G18/48C08G18/32C08G18/10
CPCC08G18/10C08G18/4825C08G18/4854C08G18/721C08G18/758C08G18/7671C08G18/792C08G18/794C08G18/3206
Inventor 张冬陈红祥吴金彤童彤周瑜
Owner WUHAN UNIV OF SCI & TECH
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