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Controlled release microcapsule for adhesive and preparation method thereof

A technology for adhesives and microcapsules, which is applied in the field of controllable release microcapsules for adhesives and its preparation, can solve the problems of poor monodispersity, low loading efficiency, and low stability of microcapsules, and achieve good stability, The effect of high load rate and easy operation

Active Publication Date: 2019-06-28
SOUTH CHINA NORMAL UNIVERSITY
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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 disadvantages of poor monodispersity, low stability and low loading efficiency of microcapsules prepared in the prior art, and provide a method for preparing controllable release microcapsules for adhesives

Method used

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  • Controlled release microcapsule for adhesive and preparation method thereof
  • Controlled release microcapsule for adhesive and preparation method thereof
  • Controlled release microcapsule for adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Preparation of microfluidic devices: This example uses a capillary microfluidic device with a coaxial two-stage flow structure. The overall structure of the device is as follows: figure 1 As shown, the internal structure is as figure 2 shown. Specifically, the device includes three circular glass capillaries, which are injection tube I, injection tube II, receiving tube and two square glass capillaries respectively. Injection tube I, injection tube II and receiving tube are all inserted into the square glass capillary, and the injection tube One end of Ⅰ and injection tube II is drawn into a tapered shape with a drawing machine, and one end is an untreated open end. Insert the tapered end of injection tube Ⅰ into the open end of injection tube Ⅱ, leaving a part of the gap at the insertion port. Located in the middle of the first square glass capillary; insert the tapered end of the injection tube II into the receiving tube, leaving a gap at the insertion port, and the...

Embodiment 2

[0092] Preparation of microfluidic devices: This example uses a capillary microfluidic device with a coaxial three-phase flow focusing structure. The overall structure of the device is as follows image 3 As shown, the internal structure is as Figure 4shown. Specifically, the device includes two circular glass capillaries and a square glass capillary. One end of the two circular glass capillaries is drawn into a tapered shape with a needle puller. The diameter of one tapered end is 30 μm, and the diameter of the other tapered end is Insert the tapered ends of the drawn two capillaries into the square glass capillary in opposite directions, the distance between the tapered ends is 100 μm, and connect and encapsulate the three glass tubes with a tee and adhesive.

[0093] Internal phase, middle phase and external phase material and concentration are identical with embodiment 1.

[0094] Preparation of water-in-oil-in-water emulsion: Use three syringes to extract the inner pha...

Embodiment 3

[0098] The preparation of the microfluidic device is the same as in Example 2.

[0099] Prepare internal phase, middle phase and external phase solution: the configuration of internal phase and external phase solution is the same as in Example 1;

[0100] 0.1 wt% of the initiator 2,2-dimethoxy-2-phenylacetophenone was dissolved in tripropylene glycol diacrylate monomer (99.9 wt%), which was used as the middle phase.

[0101] The preparation method of the water-in-oil-in-water emulsion is the same as in Example 2, but the inner phase, the middle phase and the outer phase form double emulsified droplets with a flow rate of 2 μL / min, 6 μL / min, and 30 μL / min respectively ( Figure 12 ).

[0102] The collection and solidification of the emulsified droplets are the same as in Example 1.

[0103] Microcapsule size: The particle size of the formed microcapsule is about 180 μm, and the shell thickness is about 25 μm.

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Abstract

The invention relates to a controlled release microcapsule for an adhesive and a preparation method thereof. The preparation method comprises the following steps: S1, mixing inner phase liquid drops with middle phase liquid drops to obtain emulsified liquid drops, wherein the middle phase wraps the inner phase; S2, mixing the emulsified liquid drops with the outer phase liquid drops to obtain double emulsified liquid drops, wherein the outer phase liquid drops wrap the emulsified liquid drops; and S3, curing the double emulsified liquid drops, flushing, filtering and drying the liquid drops toobtain the controlled release microcapsule for the adhesive, wherein the inner phase is a solution containing a substance 1 capable of initiating a crosslinking reaction, the middle phase is a solution containing a substance 2 capable of being cured directly and a surfactant, the outer phase is a liquid containing a surfactant 2, and the inner and outer phases are not dissoluble to the middle phase. By way of double emulsion to form the liquid drops to further obtain the microcapsule, the preparation method is simple in process, easy to operate and low in cost. The prepared microcapsule can be flexibly controlled in dimension, shell thickness and monodispersity, and is good in monodispersity and good in stability.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and in particular relates to a controllable-release microcapsule for adhesives and a preparation method thereof. Background technique [0002] Adhesives are widely used in the construction industry, wood industry, shoe industry, paper products and packaging, automotive electronics industry and other fields. They are easy to use and have high economic benefits, and play an important role in industrial production and daily life. However, at present, it is mainly based on direct coating and gluing of a single-component adhesive to achieve bonding, or multiple components are mixed and cross-linked to achieve bonding. This is very unfavorable for processes that require large-area bonding or require flexible bonding. Therefore, people have proposed a controllable method of cross-linking and bonding that can only occur under specific conditions-microcapsule technology. Microcapsule technology refers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02C09J11/06C09J11/08
Inventor 水玲玲尤祥申王秉晟李岚慧金名亮
Owner SOUTH CHINA NORMAL UNIVERSITY
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