A long-acting repairing double-layer microcapsule

A microcapsule, double-layer technology, applied in the field of coatings, can solve the problems of microcapsule failure, weak microcapsule wall structure, unable to exert repairing effect, etc., and achieves the effect of maintaining activity, better and lasting repairing effect, and various repairing methods.

Active Publication Date: 2022-03-01
CHENGDU TECH 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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  • A long-acting repairing double-layer microcapsule
  • A long-acting repairing double-layer microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0063] (1) Preparation of styrene-divinylbenzene copolymer 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 centrifugation was repeated 3 times. White solid st...

Embodiment 2

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

[0078] (1) Preparation of styrene-divinylbenzene copolymer 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 ( (absolute ethanol:methanol=1:1 mixed alcohol) for washing, repe...

Embodiment 3

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

[0090] (1) Preparation of styrene-divinylbenzene copolymer 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 centrifugal washing 3 ti...

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Abstract

The invention discloses a preparation method of long-acting repair type double-layer microcapsules, comprising the following steps: (1) preparing SDB nanospheres: taking an azo initiator, adding styrene, divinylbenzene and anionic surfactant In the mixture, an oil-in-water Pickering emulsion was made; under the protection of nitrogen, the Pickering emulsion was heated and reacted to obtain white solid SDB nanospheres; (2) Preparation of SDB / PMMA nanocomposite particles: Add PMMA to water, add SDB Nanospheres, wait for PMMA to swell into SDB particles; add oxidant, drop inorganic acid to make PMMA fully polymerized, and obtain SDB / PMMA nanocomposite particles; (3) Prepare ZIF‑8 / PMMA hollow microspheres: SDB / PMMA nanocomposite Particles, 2-methylimidazole, add anhydrous methanol, add zinc nitrate, react to get ZIF-8 / SDB / PMMA composite particles; add to organic solvent, remove SDB template, get ZIF-8 / PMMA hollow microspheres; (4 ) Load repair agent or corrosion inhibitor: add ZIF‑8 / PMMA hollow microspheres to soak in repair solution to obtain ZIF‑8 / PMMA / repair solution microcapsules.

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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Patent Type & Authority Patents(China)
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 TECH UNIV
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