External repairing internal fixing type polyurea-based dual-wall self-repairing microcapsule and preparation method thereof

A self-healing microcapsule, internal solid technology, applied in microcapsule preparation, microsphere preparation, coating and other directions, can solve the problem of low contact rate between repairing agent and curing agent, achieve excellent physical and chemical properties and prolong service life. Effect

Active Publication Date: 2018-05-01
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The repairing agent and the curing agent are stored in the inner capsule core and the outer capsule core respectively, which not only solves the problem of low contact rate between the r

Method used

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  • External repairing internal fixing type polyurea-based dual-wall self-repairing microcapsule and preparation method thereof
  • External repairing internal fixing type polyurea-based dual-wall self-repairing microcapsule and preparation method thereof
  • External repairing internal fixing type polyurea-based dual-wall self-repairing microcapsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Externally repaired and internally solid polyurea-based double-walled self-healing microcapsules, including an inner capsule wall and an outer capsule wall; the inner capsule wall is coated with an amine-based chain extender emulsion, and the outer capsule wall is coated with a pre- Polymer emulsion; both the inner capsule wall and the outer capsule wall are polyurea prepared by interfacial polymerization, and the polyurea is coated with the amine-based chain extender emulsion coated by the inner capsule wall and the outer capsule wall The prepolymer emulsion reaction is obtained.

[0029] The preparation method of externally repaired and internally solidified polyurea-based double-wall self-repairing microcapsules comprises the following steps:

[0030] (1) Preparation of prepolymer emulsion: aliphatic isocyanate repair agent isophorone diisocyanate (IPDI) and amino-terminated polyether polyetheramine D400 are mixed uniformly according to a mass ratio of 1:1 to obtain ...

Embodiment 2

[0039] Different from Example 1,

[0040] The preparation method of externally repaired and internally solidified polyurea-based double-wall self-repairing microcapsules comprises the following steps:

[0041] (1) Preparation of prepolymer emulsion: aliphatic isocyanate repair agent 1,4-cyclohexane diisocyanate and amino-terminated polyether 3,5-dimethylthiotoluene-2,6-diamine according to 1: Mix evenly with a mass ratio of 2 to obtain a prepolymer; stir evenly at a rotating speed of 2000rmp, add an emulsifier and a solvent, and heat at 68°C for 2-3h at a rotating speed of 2300rpm to obtain a prepolymer emulsion; the emulsifier The amount is 9% of the mass of the prepolymer, and the mass ratio of the emulsifier to the solvent is 1:154.

[0042] (2) Preparation of amine-based chain extender emulsion: take an appropriate amount of emulsifier and solvent, stir at a speed of 1000rmp until mixed evenly; the mass ratio of the emulsifier and solvent is 1:46; add the amine-based chai...

Embodiment 3

[0049] Different from Example 1,

[0050] The preparation method of externally repaired and internally solidified polyurea-based double-wall self-repairing microcapsules comprises the following steps:

[0051] (1) Preparation of prepolymer emulsion: mix the allophanate of the aliphatic isocyanate repair agent 1,6-hexamethylene diisocyanate and the amino-terminated polyether 1,4 butanediamine according to the mass of 1:3 Mix evenly to obtain a prepolymer; stir evenly at a rotating speed of 3000rpm, add an emulsifier and a solvent, and heat at 70°C for 2-3h at a rotating speed of 3000rpm to obtain a prepolymer emulsion; the amount of the emulsifier is 6% of the polymer mass, the mass ratio of the emulsifier to the solvent is 1:158.

[0052] (2) Preparation of amine-based chain extender emulsion: take an appropriate amount of emulsifier and solvent, stir at a speed of 1600rmp until mixed evenly; the mass ratio of the emulsifier to solvent is 1:48; add amine-based chain extender ...

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Abstract

The invention provides a dual-wall microcapsule system which takes aliphatic isocyanate-amine-terminated polyether polymer as a repair agent and takes an amine group chain extender as a curing agent.The external repairing internal fixing type polyurea-based dual-wall self-repairing microcapsule comprises an inner-layer capsule wall and an outer-layer capsule wall, wherein the inner-layer capsulewall coats the amine group chain extender emulsion, and the outer-layer capsule wall coats prepolymer emulsion; the inner-layer capsule wall and the outer-layer capsule wall are both polyurea preparedwith an interfacial polymerization method; the polyurea of the inner-layer capsule wall is obtained in a way that the amine group chain extender emulsion coated with the inner-layer capsule wall andthe prepolymer emulsion coated with the outer-layer capsule wall react; the polyurea of the outer-layer capsule wall is obtained in a way that the amine group chain extender emulsion and the prepolymer emulsion coated with the outer-layer capsule wall react; the repairing agent and the curing agent are respectively stored in an inner-layer capsule core and an outer-layer capsule core. Therefore, the problem that the contact rate of the repairing agent and the curing agent is low is solved, and in addition, the repairing agent and the curing agent quickly react so the quick repair of cracks isrealized and the external repairing internal fixing type polturea-based dual-wall self-repairing microcapsule also has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of organic composite materials, and relates to a self-repairing material, in particular to a polyurea-based double-wall self-repairing microcapsule with external repair and internal solidification and a preparation method thereof, which are applied to building disaster prevention and reduction, coating protection and repair, etc. engineering field. Background technique [0002] With the continuous development of society, the construction industry has also developed rapidly, and various high-rise buildings, bridges and roads have been dug up one after another. Concrete is widely used in the field of construction because of its wide range of sources, high compressive strength, easy construction and high durability. However, concrete structures are highly prone to cracks during their service life. With the change of load and the passage of time, the cracks will gradually expand into cracks, and even extend to the surfa...

Claims

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Application Information

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IPC IPC(8): B01J13/02B01J13/16B01J13/20B01J13/22C09D7/65
CPCB01J13/02B01J13/025B01J13/16B01J13/20B01J13/22
Inventor 马衍轩张颖锐李梦瑶周桓竹王鑫李宾王君燕王金华
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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