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A method for preparing capsules from oil-soluble etherified amino resin

An etherified amino resin and oil-soluble technology is applied in the field of preparing capsules from oil-soluble etherified amino resin as a wall-forming raw material, which can solve the problems affecting the encapsulation effect and efficiency, poor encapsulation effect and efficiency, etc., and achieves good appearance. , the effect of high encapsulation efficiency and low energy consumption

Active Publication Date: 2019-02-15
天津优米优科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods all use water-soluble amino resin prepolymers, which affect the encapsulation effect and efficiency
Although Su Junfeng and others have also selected partly etherified melamine formaldehyde prepolymer, they still mix it with an appropriate amount of water, and then add it dropwise to the continuous water phase, which is similar to the encapsulation method mentioned in the previous two patents. There is also the problem that the above-mentioned encapsulation effect and efficiency are poor

Method used

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  • A method for preparing capsules from oil-soluble etherified amino resin
  • A method for preparing capsules from oil-soluble etherified amino resin
  • A method for preparing capsules from oil-soluble etherified amino resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Stir 10g of n-dodecyl alcohol and 10g of methyl etherified amino resin evenly to obtain an oil phase solution; add this oil phase solution to 200g of PVA aqueous solution with a concentration of 5wt%, and then emulsify at a high speed at 8000rpm for 15 minutes to obtain Stable oil-in-water emulsion; transfer the above-mentioned oil-in-water emulsion to a three-necked flask, and heat up to 70°C while stirring at a speed of 100rpm. During this process, adjust the pH value to about 4.5 with 10% citric acid solution, and react After 3 hours, the amino resin polymer capsule suspension can be obtained, and the capsule wet cake can be obtained after filtering, washing and drying.

[0025] The amino resin polymer capsule that present embodiment makes is as figure 1 , 2 shown, from figure 1 It can be seen that nanoparticles are adhered to the surface of the capsule prepared in this example, the surface structure of the capsule is dense, and the capsule has certain depressions....

Embodiment 2

[0027] Stir 1 kg of cypress essential oil and 200 g of butylated amino resin evenly to obtain an oil phase solution; add this oil phase solution to 3 kg of a 5 wt % sodium polyacrylate aqueous solution, and then emulsify at a high speed at 10,000 rpm for 10 minutes to prepare A stable oil-in-water emulsion was obtained. Heat the above oil-in-water emulsion to 50°C while stirring at a speed of 200rpm. During this process, use 10% citric acid solution to adjust the pH value to about 3.5. After 3 hours of reaction, the suspension of amino resin polymer essence capsules can be obtained. solution, filtered, washed, and dried to obtain a capsule wet cake. Observing the sample with a scanning electron microscope, the particle size distribution of the prepared spherical capsules is 1-10 μm. The forming process of the capsule is simple and easy to control, and at the same time, the encapsulation efficiency is very high, and the industrialization prospect is very bright.

Embodiment 3

[0029] Mix 20kg of mosquito repellent incense oil, 5kg of dodecyl etherified amino resin and 1kg of acetone to obtain an oil phase solution; add this oil phase solution to a solution prepared by dissolving 10kg of styrene maleic anhydride sodium salt in 100kg of water In the emulsifier aqueous solution, emulsify at a high speed for 30 minutes under the condition of 2000rpm to obtain an oil-in-water emulsion with an average particle size of 20μm. Add acetic acid dropwise to adjust the pH value to 3, then raise the temperature to 85° C., and react for 2 hours to obtain the amino resin capsule suspension of mosquito repellent essence. The morphology and structure of the samples were observed with a scanning electron microscope, and the particle size of the spherical capsules was mostly distributed in the range of 5-80 μm.

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Abstract

The invention provides a method for preparing capsules with oil-soluble etherified amino resin in situ as wall-forming monomers. The method includes the following steps that firstly, alkanol etherified amino resin with different carbon chain lengths and oil-soluble matter are mixed and fully stirred and dissolved to obtain a homogeneous oil phase; secondly, the prepared homogeneous oil phase is added into an aqueous solution containing emulsifier for sufficient stirring, shearing and emulsifying, and emulsion drops with the grain size ranging from 10 nm to 5 mm are obtained; thirdly, the emulsion drops are heated according to programs, the pH value is adjusted so that the etherified amino resin can have a polymerization and solidification reaction on the surfaces of the emulsion drops to form capsule walls covering the oil phase, and the capsules with nuclear shell structure are obtained after filtering and washing. The synthesis technology is simple, energy consumption is low, requirements of equipment are low, reaction conditions are easy to control, and the prospect of large-scale production is achieved. The easy capsulation method has very huge application prospects in the fields of pesticide, cosmetics and intelligent heat-storage temperature-adjusting textile.

Description

technical field [0001] The invention relates to a method for preparing capsules, in particular to a method for preparing capsules using oil-soluble etherified amino resin as a wall-forming raw material. Background technique [0002] Capsule technology is a technology in which film-forming materials wrap solids, liquids or gases to form tiny particles, which can protect the capsule core, control release, and achieve permanent solidification, which greatly facilitates the application range of the capsule core material. According to The particle size can be divided into: nanocapsules with a particle size of less than 1 μm, microcapsules with a particle size of 1-1000 μm, and macrocapsules with a particle size greater than 1 mm. Their application areas cover medicine, food, coatings, pesticides, adhesives, inks, and textile dyeing and finishing. [0003] At present, amino resin capsules often use water-soluble amino resin prepolymers. By adjusting the pH value and temperature i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/18C08G12/40
CPCB01J13/185C08G12/40
Inventor 李伟黄睿霍晓楠宗记文吴岩
Owner 天津优米优科技有限公司
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