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Urea-formaldehyde resin coated epoxy acrylic resin microcapsule for resin-base self-repair coating and preparation method thereof

A technology of coating epoxy acrylic acid and epoxy acrylic acid, which is applied in the field of urea-formaldehyde resin coating epoxy acrylic resin microcapsules and preparation, can solve the problems of loss of catalytic activity and affecting repair efficiency, etc., achieve low cost, expand application range, and The effect of low consumption

Active Publication Date: 2012-11-14
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the repair principle of this self-repair system is based on the rapid nucleophilic addition reaction of epoxy resin and thiol at room temperature under the action of a tertiary amine catalyst for self-repair. It is necessary to pre-embed the amine catalyst in the resin matrix in advance. The catalyst has amphiphilicity and high activity at room temperature, and it is easy to react and lose catalytic activity when embedded in the resin matrix, which greatly affects the repair efficiency

Method used

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  • Urea-formaldehyde resin coated epoxy acrylic resin microcapsule for resin-base self-repair coating and preparation method thereof
  • Urea-formaldehyde resin coated epoxy acrylic resin microcapsule for resin-base self-repair coating and preparation method thereof
  • Urea-formaldehyde resin coated epoxy acrylic resin microcapsule for resin-base self-repair coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] In a 100ml three-necked bottle, add 60g of styrene-maleic anhydride emulsifier with a mass fraction of 5%, add 2 drops of n-octanol as a defoamer, mix 5g of epoxy acrylic resin and 5g of tripropylene glycol diacrylate, and add In the above emulsifier aqueous solution, emulsify at 1000rpm for 10min, adjust the pH to 2.5 with 10% citric acid, raise the temperature of the reaction system to 70°C at a heating rate of 5°C / min, add 1.5g urea, 0.2g resorcinol, 3g Formaldehyde solution with a mass fraction of 37% was used to maintain the reaction for 2 hours, and the reaction ended. The reacted system was washed 5 times with deionized water at 60° C., centrifuged, suction filtered and freeze-dried to obtain a white microcapsule product.

Embodiment 2

[0029] In a 100ml three-necked bottle, add 60g of styrene-maleic anhydride emulsifier with a mass fraction of 5%, add 2 drops of n-octanol as a defoamer, and mix 7.5g of epoxy acrylic resin and 2.5g of tripropylene glycol diacrylate , add the above emulsifier aqueous solution, emulsify at 1000rpm for 10min, adjust the pH to 2.5 with 10% citric acid, raise the temperature of the reaction system to 70°C at a heating rate of 5°C / min, add 1.5g urea, 0.2g resorcinol , 3g of formaldehyde solution with a mass fraction of 37%, maintain the reaction for 2h, and the reaction ends. The reacted system was washed 5 times with deionized water at 60° C., centrifuged, suction filtered and freeze-dried to obtain a white microcapsule product.

Embodiment 3

[0031] In a 100ml three-necked bottle, add 60g of styrene-maleic anhydride emulsifier with a mass fraction of 4%, add 2 drops of n-octanol as a defoamer, mix 5g of epoxy acrylic resin and 5g of tripropylene glycol diacrylate, and add In the above emulsifier aqueous solution, emulsify at 1000rpm for 10min, adjust the pH to 2.5 with 10% citric acid, raise the temperature of the reaction system to 70°C at a heating rate of 5°C / min, add 1.5g urea, 0.2g resorcinol, 3g Formaldehyde solution with a mass fraction of 37% was used to maintain the reaction for 2 hours, and the reaction ended. The reacted system was washed 5 times with deionized water at 60° C., centrifuged, suction filtered and freeze-dried to obtain a white microcapsule product.

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Abstract

The invention relates to a urea-formaldehyde resin coated epoxy acrylic resin microcapsule for a resin-base self-repair coating and a preparation method thereof. The preparation method is characterized by comprising the following steps: adding capsule core raw materials epoxy acrylic resin and acrylate reactive diluent into a water solution containing an emulsifier and a defoaming agent, dispersing the capsule core with a homogenizer or emulsifying machine to form a stable emulsion; regulating the pH value of the stable emulsion system to 2-3, adding capsule wall raw materials urea, formaldehyde and crosslinking agent, stirring until the capsule is formed, and after the reaction finishes, regulating the pH value of the system to neutral; and repeatedly washing with hot water and acetone, centrifuging, and carrying out vacuum drying to obtain the epoxy acrylic resin microcapsule. The capsule provided by the invention has the advantages of favorable sealability, regular sphericity, controllable grain size and controllable capsule wall thickness, and can be widely used for self-repair of a UV-cured acrylic resin coating or epoxy resin coating at low temperature and room temperature, thereby prolonging the service life of the coating material and widening the application range of the resin-base coating.

Description

technical field [0001] The invention relates to a urea-formaldehyde resin-coated epoxy acrylic resin microcapsule for resin-based self-healing coatings and a preparation method. A series of microcapsules are synthesized with urea, formaldehyde, epoxy acrylic resin and acrylic active diluent as main raw materials. Microcapsules with controllable particle size, controllable wall thickness, high coating efficiency, good sealing and stability. Background technique [0002] Microcapsule technology started in the 1930s and achieved commercial success in the early 1950s, thus creating a new era of microcapsule application. At present, microcapsule technology has been widely used in many fields such as medicine, food, pesticides, coatings, adhesives, cosmetics, food processing, printing, catalysts, textiles, computers, etc., and has attracted much attention worldwide. With the rapid development of microcapsule technology and its special core-shell structure, the application researc...

Claims

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Application Information

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IPC IPC(8): B01J13/14C08L63/10C08K5/103C08L61/24C08G12/12
Inventor 张秋禹刘瑜尹德忠许海龙马明亮
Owner NORTHWESTERN POLYTECHNICAL UNIV
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