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Double-layer microcapsule with long-acting repairing performance

A microcapsule and double-layer technology, applied in the field of coatings, can solve the problems of weak microcapsule wall structure, inability to exert repair effect, microcapsule failure, etc., achieve excellent and durable repair effect, various release and diffusion characteristics, and low emulsifier dosage Effect

Active Publication Date: 2019-11-19
CHENGDU TECHCAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems in the prior art that the microcapsules are gradually inactivated during storage, and the wall structure of the microcapsules is weak, which leads to the failure of the microcapsules due to various reasons and cannot exert the repairing effect, and provides a long-term Preparation method of effective repair type double-layer microcapsule and microcapsule product thereof

Method used

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  • Double-layer microcapsule with long-acting repairing performance
  • Double-layer microcapsule with long-acting repairing performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Preparation of long-acting double-layer microcapsules

[0063] Preparation of SDB nanospheres

[0064] Take 0.0078g of azobisisobutyronitrile, add 1.4g of styrene, 2.1g of DVB (divinylbenzene (DVB, 80%, mixture of isomers, containing 4-tert-butylcatechol inhibitor at a concentration of less than 0.1%) and 4g sodium lauryl sulfate, stir and mix evenly to form an oil phase. Add 50mL of deionized water, mix evenly, and use a high-speed homogenizer to homogenize for 2min at a speed of 15000r / min to obtain a stable oil-in-water skin Kling emulsion. The resulting emulsion was added to a 100mL double-neck round bottom flask, cooled and replaced with nitrogen for 20min, and then the emulsion was heated in a water bath at 75°C for 16h. After the reaction, it was centrifuged at 6000r / min for 2min, and the product was collected and washed with 10mL of absolute ethanol Washing was carried out, and the centrifugal washing was repeated 3 times. White solid SDB nanospheres were obtai...

Embodiment 2

[0077] Preparation of long-acting double-layer microcapsules

[0078] Preparation of SDB nanospheres

[0079]Take 0.0078g of azobisisobutyronitrile, add 1.5g of styrene, 2.2g of DVB (divinylbenzene (DVB, 80%, mixture of isomers, containing 4-tert-butylcatechol inhibitor at a concentration of less than 0.1%) ) and 4.3g of sodium lauryl sulfate, stir and mix evenly to form an oil phase. Add 50mL of deionized water, mix evenly, and use a high-speed homogenizer to homogenize at a speed of 12000r / min for 3min to obtain a stable water package Oily Pickering emulsion. The obtained emulsion was transferred to a 100mL double-neck round bottom flask, cooled and passed through nitrogen for 25min, then the emulsion was heated in a water bath at 73°C for 24h, and after the reaction, it was centrifuged at 6000r / min for 2min, and the product was collected and washed with 10mL of mixed alcohol ( Anhydrous ethanol:methanol=1:1 mixed alcohol) for washing, repeated centrifugal washing 3 times. ...

Embodiment 3

[0089] Preparation of long-acting double-layer microcapsules

[0090] Preparation of SDB nanospheres

[0091] Take 0.008g of azobisisobutyronitrile, add 1.5g of styrene, 2.1g of DVB (divinylbenzene (DVB, 80%, mixture of isomers, containing 4-tert-butylcatechol inhibitor at a concentration of less than 0.1%) Mix with 4.1g sodium tetradecyl sulfate, stir and mix evenly to form an oil phase.Add 50mL of deionized water, mix evenly, and use a high-speed homogenizer to homogenize for 4min at a speed of 15000r / min to obtain a stable oil-in-water pg Lin emulsion. The obtained emulsion was put into a 100mL double-necked round bottom flask, and after cooling, the nitrogen was blown for 15min to replace the air, and then the emulsion was heated in a water bath at 79°C for 12h. After the reaction, it was centrifuged at 6000r / min for 2min, and the product was collected and dehydrated with 10mL of absolute ethanol. Washing, repeated centrifugation and washing 3 times, obtained white solid ...

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Abstract

The invention discloses a preparation method for a double-layer microcapsule with long-acting repairing performance. The preparation method comprises the following steps: (1) preparation of SDB nanospheres: weighing an azo initiator, adding the azo initiator into a mixture of styrene, divinylbenzene and an anionic surfactant to prepare an oil-in-water Pickering emulsion, and subjecting the Pickering emulsion to heating and a reaction under the protection of nitrogen so as to obtain the white solid SDB nanospheres; (2) preparation of SDB / PMMA nanocomposite particles: weighing PMMA, adding the PMMA into water, adding the SDB nanospheres, allowing the PMMA to swell into the SDB nanosphere, adding an oxidizing agent, then adding inorganic acid drop by drop, and allowing the PMMA to fully undergo polymerization so as to obtain the SDB / PMMA nanocomposite particles; (3) preparation of ZIF-8 / PMMA hollow microspheres: adding the SDB / PMMA nanocomposite particles and 2-methylimidazole into anhydrous methanol, adding zinc nitrate, carrying out a reaction to obtain ZIF-8 / SDB / PMMA composite particles, and adding the ZIF-8 / SDB / PMMA composite particles into an organic solvent to remove a SDB template so as to obtain the ZIF-8 / PMMA hollow microspheres; and (4) loading of a repairing agent or a corrosion inhibitor: soaking the ZIF-8 / PMMA hollow microspheres into a repairing solution to obtain the ZIF-8 / PMMA / repairing solution microcapsule.

Description

technical field [0001] The invention relates to a microcapsule, in particular to a preparation method of a long-acting double-layer microcapsule, which belongs to the technical field of coatings. Background technique [0002] Coating is a kind of polymer-based composite material, which has all the characteristics of long chain segments of polymer polymers. After the construction is completed, the coating is gradually cured by cross-linking and polymerization, and reaches the highest strength performance after a period of time after complete curing. As the construction time of the coating increases, the internal cross-linking structure of the coating will gradually be damaged, resulting in a decrease in the mechanical properties of the coating. If the environment fluctuates in temperature, the surface of the coating is very prone to cracks. Cracks only exist inside the paint at first, and are difficult to find and repair. As the cracks gradually merge and merge, large cracks...

Claims

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Application Information

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IPC IPC(8): B01J13/14B01J13/02C08F212/36C08F212/08C08F2/26C09D7/65B82Y40/00
CPCB01J13/14B01J13/02C08F212/36C08F2/26C09D7/70B82Y40/00C08F212/08
Inventor 廖益均吴晓莉曹剑飞邱士安梁昊天唐海龙
Owner CHENGDU TECHCAL UNIV
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