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Self-healing microcapsules and preparation method thereof, self-healing coating and preparation method thereof

A self-healing microcapsule and self-repairing technology, applied in the field of coatings, can solve the problem that microcapsules cannot spontaneously detect damaged parts, and achieve the effect of meeting the needs of large-scale production and application, reducing environmental pollution and reducing VOC emissions.

Active Publication Date: 2022-01-28
HUNAN AEROSPACE SANFENG SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing self-healing microcapsule technology only relies on external damage to mechanically destroy the microcapsule structure to trigger the self-healing process of the material, and the microcapsule cannot spontaneously detect the damaged part and quickly repair the damaged part

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]100.0 parts by weight of deionized water, 20.0 parts by weight of natural peanut oil, and 3.0 parts by weight of OP-10 were placed in a mechanical stirrer, and stirred at a constant speed of 2000r / min for 30 minutes to obtain a stable natural vegetable oil emulsion. Then add 40.0 parts by weight of dry sepiolite powder into the natural vegetable oil emulsion, stir for 10 hours with a rotating speed of 3000r / min, then centrifuge, filter and dry to obtain dry sepiolite powder, take 40.0 parts by weight of poly Ethylene glycol 4000, 5.20 parts by weight HMDI, 30.0×10 -3 Parts by weight of dibutyltin dilaurate and 240.0 parts by weight of DMF were reacted in a reactor at 80°C for 2 hours to obtain a polyurethane prepolymer I with an isocyanate-terminated structure; then 1.19 parts by weight of MDEA and 2.60 parts by weight of HMDI , 40.0 parts by weight of DMF, and continue to react at 80° C. for 2 hours to obtain polyurethane prepolymer II with an isocyanate-terminated stru...

Embodiment 2

[0047] 100.0 parts by weight of deionized water, 25.0 parts by weight of natural tea seed oil, and 4.0 parts by weight of sodium dodecyl sulfate (SDS) were placed in a mechanical stirrer and stirred at a constant speed of 3000r / min for 40 minutes to obtain a stable Natural vegetable oil emulsion. Then add 44.0 parts by weight of dry sepiolite powder into the natural vegetable oil emulsion, stir for 15 hours with a rotating speed of 4000r / min, then centrifuge, filter and dry to obtain dry sepiolite powder, take 60.0 parts by weight of poly Ethylene glycol 6000, 5.90 parts by weight HMDI, 30.0×10 -3 Parts by weight of dibutyltin dilaurate and 240.0 parts by weight of DMF were reacted in a reactor at 85°C for 2 hours to obtain polyurethane prepolymer I with an isocyanate-terminated structure; then 2.10 parts by weight of MDEA and 2.90 parts by weight of HMDI , 47.0 parts by weight of DMF, and continue to react at 85° C. for 2 hours to obtain polyurethane prepolymer II with an is...

Embodiment 3

[0050] 100.0 parts by weight of deionized water, natural olive oil of 28.0 parts by weight, sodium dodecyl sulfate (SDS) of 5.0 parts by weight are placed in a mechanical stirrer, stirred at a constant speed of 5000r / min for 50 minutes to obtain a stable natural Vegetable oil emulsion. Then add 48.0 parts by weight of dry sepiolite powder into the natural vegetable oil emulsion, stir for 19 hours with a rotating speed of 5000r / min, then centrifuge, filter and dry to obtain dry sepiolite powder, take 60.0 parts by weight of poly Ethylene glycol 6000, 6.70 parts by weight HMDI, 30.0×10 -3 Parts by weight of stannous octoate and 240.0 parts by weight of DMAC were reacted at 85°C for 2 hours in a reactor to obtain polyurethane prepolymer I with an isocyanate-terminated structure; then 2.30 parts by weight of MDEA, 3.20 parts by weight of HMDI, 54.0 parts by weight of DMAC in parts by weight, continued to react at 90° C. for 2 hours to obtain polyurethane prepolymer II with isocya...

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Abstract

The invention relates to a self-repairing microcapsule and a preparation method thereof, a self-repairing coating and a preparation method thereof. The self-repairing microcapsule is composed of a capsule wall and a capsule core, and is characterized in that the capsule wall is polyurethane, and the polyurethane Having an imino functional group; the capsule core includes a repair agent. When the self-healing microcapsule provided by the invention is stimulated by the change of the external pH environment, the shrinkage phenomenon of the capsule wall can occur spontaneously, and the hole structure in the capsule wall structure expands so that more repairing agent seeps out to repair the damaged paint film. Compared with existing products, the prepared self-healing coating has the characteristics of low cost, simple process and excellent performance, and meets the needs of large-scale production and application.

Description

technical field [0001] The invention relates to the field of coatings, in particular to self-repairing microcapsules and a preparation method thereof, and self-repairing coatings and a preparation method thereof. Background technique [0002] Coating usually refers to a continuous polymer film that is firmly attached to the surface of an object by spraying or brushing. It mainly plays the role of anti-corrosion and decoration. It has been widely used in many fields such as construction, transportation, machinery and aerospace. However, coatings are easily damaged by external impact or natural aging during construction or use. Among the many forms of damage, micro-damage is the most common and easily overlooked by people, and it is very easy to appear in people's production and life. cause irreparable economic losses. Taking the metal iron substrate as an example, the surface of the substrate is directly exposed to the external environment due to the micro-cracks, and the el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/65B01J13/02C09D175/04C09D7/20
CPCC09D7/65C09D7/70B01J13/02C09D175/04C09D7/20C08L2205/02C08L2205/18C08L75/08C08K9/12
Inventor 熊一帜何禄文张刚文风李俊
Owner HUNAN AEROSPACE SANFENG SCI & TECH CO LTD
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