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Metal coordination self-healing polyurethane elastomer and preparation method thereof

A polyurethane elastomer and metal coordination technology, which is applied in the field of self-healing, can solve the problems of unfavorable self-healing and restricting the development of the field of self-healing, and achieve the effect of good self-healing performance and strength recovery

Active Publication Date: 2020-06-02
SHANDONG FANGDING SAFETY GLASS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the development of self-healing materials, the industry has reached a general consensus that self-healing materials can only adopt the 2,6-position pyridine ring, which is considered to have good symmetry, easy coordination and self-healing, while asymmetric pyridine is considered It is not conducive to self-healing, so it cannot be used as a self-healing material, especially in polyurethane elastomer materials. This prejudice limits the development of the self-healing field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment adopts following raw materials:

[0034] 9.2g polypropylene carbonate diol

[0035] 4.8g 4,4'-Dicyclohexylmethane diisocyanate (HMDI)

[0036] 21g N,N-Dimethylformamide (DMF)

[0037] 0.01g dibutyltin dilaurate (DBTDL)

[0038] 1.86g ferric chloride hexahydrate

[0039] 1.53 g 2,4-dihydroxypyridine.

[0040] The preparation method of this embodiment is:

[0041] In a three-necked flask equipped with an electric stirrer, a thermocouple thermometer, and a vacuum tailpiece, add polypropylene carbonate diol, dehydrate in vacuum at 120-130°C for 3 hours, cool down to about 85°C, add HMDI, and add HMDI under nitrogen. Stir and react at 85° C. for 3 hours under protection, then add DMF and stir until the reactant is completely dissolved to obtain a prepolymer. Add 2,4-dihydroxypyridine and DBTDL to the prepolymer and stir at about 80°C for 4.5 hours to obtain a polyurethane solution containing coordination groups. Dissolve ferric chloride hexahydrate in ...

Embodiment 2

[0045] This embodiment adopts following raw materials:

[0046] 27.6g polytetrahydrofuran diol

[0047] 12.21g isophorone diisocyanate (IPDI)

[0048] 50g DMF

[0049] 0.03g stannous octoate

[0050] 3.75g zinc chloride

[0051] 4.59 g 2,4-dihydroxypyridine.

[0052] The preparation method of this embodiment is:

[0053]Add polytetrahydrofuran diol to a three-necked flask equipped with an electric stirrer, a thermocouple thermometer, and a vacuum tailpiece. After vacuum dehydration at 120-130°C for 3 hours, cool down to about 85°C and add IPDI. Stir the reaction for 3 hours, then add DMF and stir until the reactant is completely dissolved to obtain a prepolymer. Add 2,4-dihydroxypyridine and stannous octoate to the prepolymer and stir at about 80°C for 5 hours to obtain a polyurethane solution containing coordination groups. Dissolve zinc chloride in DMF to obtain a DMF solution of divalent zinc ions, add the DMF solution of divalent zinc ions to the polyurethane soluti...

Embodiment 3

[0057] This embodiment adopts following raw materials:

[0058] 46g polyethylene adipate

[0059] 22.5g 4,4'-diphenylmethane diisocyanate (MDI)

[0060] 80g DMF

[0061] 0.05g tetramethylbutylene diamine

[0062] 6.75g ferrous chloride tetrahydrate

[0063] 7.65 g 2,4-dihydroxypyridine.

[0064] The preparation method of this embodiment is:

[0065] Add polyethylene adipate to a three-necked flask equipped with an electric stirrer, a thermocouple thermometer, and a vacuum tailpiece, dehydrate in vacuum at 120-130°C for 3 hours, then cool down to about 85°C and add MDI, Stir and react at 85° C. for 3 hours under protection, then add DMF and stir until the reactant is completely dissolved to obtain a prepolymer. Add 2,4-dihydroxypyridine and tetramethylbutanediamine to the prepolymer and stir at about 80°C for 5 hours to obtain a polyurethane solution containing coordination groups. Dissolve ferrous chloride in DMF to obtain a DMF solution of ferrous ions, add the DMF sol...

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Abstract

The invention discloses a metal coordination self-healing polyurethane elastomer and a preparation method thereof, and belongs to the technical field of self-healing. The preparation method comprisesthe following steps: mixing a dihydric alcohol oligomer with isocyanate to prepare a polyurethane prepolymer; taking 2,4-dihydroxypyridine is used as a chain extender, adding a catalyst and a solvent,and carrying out a chain extension reaction on the polyurethane prepolymer; and after chain extension is finished, adding a metal ion solution, stirring at 70-90 DEG C for 1-2 h, and curing to obtainthe metal coordination self-healing polyurethane elastomer. Asymmetric 2,4-dihydroxypyridine is adopted as the chain extender, conventional cognition in the industry is broken through, and the prepared polyurethane elastomer has good self-repairing performance under the combined action of pyridine, a metal ion coordination bond and a double-dynamic network of intermolecular hydrogen bonds.

Description

technical field [0001] The invention belongs to the technical field of self-healing, and in particular relates to a metal coordination self-healing polyurethane elastomer and a preparation method thereof. Background technique [0002] After animals and plants are injured, the wound usually heals by itself, that is, the phenomenon of self-healing has occurred. Inspired by these phenomena, people have developed many kinds of self-healing materials. Thermoplastic polyurethane (TPU) is a material with broad development prospects. It is a polyurethane elastomer with rubber elasticity at room temperature and plasticity at high temperature. TPU is between rubber and plastic. It has both the elasticity of rubber and the rigidity of plastic. At the same time, TPU has certain excellent mechanical properties, physical properties and weather resistance. TPU is widely used in mobile phone cases, shoe soles, artificial leather, auto parts, gears, environmentally friendly flooring and ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/83C08G18/66C08G18/44C08G18/38C08G18/48C08G18/42
CPCC08G18/83C08G18/6633C08G18/44C08G18/3844C08G18/6666C08G18/4854C08G18/4238
Inventor 罗振扬武志鹏王超马晓峰罗艳龙贾桓申治华
Owner SHANDONG FANGDING SAFETY GLASS TECH CO LTD
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