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The preparation method of polyurethane capsule

A polyurethane and polyurethane acrylate technology, which is applied in the field of rapid preparation of polyurethane capsules, can solve the problems of long reaction time, low production efficiency, and limited effective solid content, and achieve high encapsulation efficiency, simple process, and low energy consumption.

Active Publication Date: 2015-11-11
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

These methods all need to undergo heating reaction, which does not conform to the concept of energy saving and environmental protection, and the reaction time is long, generally taking several hours; on the other hand, the effective solid content of the final capsule product is limited by the interfacial polymerization reaction, and the production efficiency is low.

Method used

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  • The preparation method of polyurethane capsule
  • The preparation method of polyurethane capsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Stir 100g n-hexadecane, 100g hexafunctional aliphatic urethane acrylate, 10g2,4,6-trimethylbenzoyl-diphenylphosphine oxide and 100g cyclohexane to obtain an oil phase solution; The oil phase solution was added into 500 g of PVA aqueous solution with a concentration of 5 wt%, and then emulsified at a high speed at 5000 rpm for 15 minutes to obtain a stable oil-in-water emulsion. Transfer the above-mentioned oil-in-water emulsion to a three-necked quartz flask, and irradiate the polyurethane capsule suspension with a power of 150w and a wavelength of 360nm for 15min while stirring at a speed of 100rpm to obtain the polyurethane capsule suspension. Filter, wash and dry to obtain polyurethane capsules.

[0026] The appearance of the polyurethane capsule that present embodiment makes is as figure 1 , 2 shown, from figure 1 It can be seen that the surface of the polyurethane capsules prepared in this example is smooth and dense, in a regular spherical shape. exist figur...

Embodiment 2

[0031] In order to increase the flexibility of the capsule wall, a difunctional aliphatic urethane acrylate was selected as a comonomer. The aliphatic urethane acrylate of 1kg lauryl alcohol, 800g difunctionality, the aliphatic urethane acrylate of 200g hexafunctionality, 50gITX photoinitiator and 1000g acetone are stirred to obtain oil phase solution; This oil phase solution is added to by 100g sodium lauryl sulfate and 400g polyacrylic acid are dissolved in the emulsifier aqueous solution prepared by 5kg water, and emulsified at a high speed for 30 minutes at 8000rpm to obtain an oil-in-water emulsion with an average particle diameter of 1.6 μm; Transfer the oily emulsion to an open glass beaker, and irradiate it with ultraviolet light with a power of 1kw and a wavelength of 370nm while stirring at a speed of 200rpm. After reacting for 30min, a polyurethane capsule suspension can be obtained, and the polyurethane capsule suspension is filtered , washing and drying to obtain ...

Embodiment 3

[0034] Mix 20kg mosquito repellent incense oil, 15kg difunctional aromatic urethane acrylic acid, 5kg hexafunctional aliphatic urethane acrylate, 1kg benzophenone, 0.5kg BDK photoinitiator and 15kg acetone to obtain an oil phase solution; Add this oil phase solution to an emulsifier aqueous solution prepared by dissolving 10kg sodium polyacrylate in 100kg water, and emulsify at a high speed for 30 minutes at 2000rpm to obtain an oil-in-water emulsion with an average particle size of 10μm. Under the action of air pressure, the above-mentioned oil-in-water emulsion was drawn out with a silicone tube, and then returned to the reaction vessel, and the silicone tube with the oil-in-water emulsion flowing was irradiated with ultraviolet light with a power of 2kw and a wavelength of 230nm, and reacted for 1.5h The polyurethane capsule suspension of the mosquito repellent essence can be obtained, and the morphology and structure of the sample are observed with a scanning electron micro...

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Abstract

The invention discloses a preparation method of a polyurethane capsule. The preparation method comprises the following steps: 1) uniformly stirring 100 parts of oil-soluble matters, 100-200 parts of polyurethane acrylate oligomer, 100-500 parts of an organic co-solvent and 0.5-40 parts of a photoinitiator to obtain an oil phase solution; 2) adding the oil phase solution into 200-300 parts of an aqueous solution of an emulsifier with the concentration of 0.1-50wt%, and shearing and emulsifying to obtain an oil-in-water emulsion; and 3) carrying out a reaction on the oil-in-water emulsion under the condition of stirring and ultraviolet irradiation to obtain a suspension rich in polyurethane capsule. The method is used to prepare the polyurethane capsule by means of quick initiation by ultraviolet light, so that the preparation time of the polyurethane capsule is greatly shortened. Meanwhile, the content of capsule in the capsule suspension prepared by the preparation method is high, and the method is suitable for industrialized production.

Description

technical field [0001] The invention relates to a preparation method of capsules, in particular to a rapid preparation method of polyurethane capsules. Background technique [0002] Capsules are tiny "containers" filled with liquid or solid substances such as dyes, essences, inks, and medicines, which are used to protect or control the release of capsule core substances, etc., to achieve permanent solidification of capsule core substances. According to the particle size, it 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 scope covers the fields of medicine, food, paint, pesticide, adhesive, ink and textile dyeing and finishing. [0003] At present, polyurethane capsules are often prepared by interfacial polymerization. This method is to use a cosolvent to mix the capsule core and isocyanate into a uniform oil phase, emulsify i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/36C08F2/20C08F2/48C08F6/24
Inventor 李伟张兴祥宗记文陈龙张宁欣
Owner 天津优米优科技有限公司
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