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Microcapsule with porous double-layer capsule wall and preparation method of microcapsule

A technology of microcapsules and capsule walls, which is applied in the field of porous double-layer capsule wall microcapsules and its preparation, which can solve the problems of poor controlled release of epoxy resin capsule wall materials, unstable performance of microcapsules, and difficult industrial production of pore-forming methods and other issues to achieve the effect of wide adaptability

Active Publication Date: 2017-07-28
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to make up for the above deficiencies and solve the problems of unstable properties of the microcapsules obtained in the prior art, the pore-forming method is not easy for industrial production, and the controlled release of epoxy resin as a capsule wall material is poor, the present invention provides a porous double-layer capsule wall Microcapsule and its preparation method

Method used

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  • Microcapsule with porous double-layer capsule wall and preparation method of microcapsule
  • Microcapsule with porous double-layer capsule wall and preparation method of microcapsule
  • Microcapsule with porous double-layer capsule wall and preparation method of microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 10% Beta-cyhalothrin microcapsule suspension

[0050] Take by weighing 10.29g 97.2% lambda-cyhalothrin former medicine, 15g biodiesel, 5g novolac epoxy resin, 0.3g polyisocyanate, 0.5g 2,6-bis[(dimethylamino)methyl]phenol and stir to obtain Oil phase; dissolve 0.1g polyvinyl alcohol, 3.0g sodium lignosulfonate, and 1.55g castor oil polyoxyethylene ether in 50g water, and stir evenly to obtain the water phase; at 30°C, mix the oil phase and the water phase, Homogeneous emulsification to obtain a stable O / W emulsion; then transfer the emulsion to a three-necked flask, stir at 300 rpm; slowly add 10% diamine aqueous solution dropwise, adjust the pH=7.5-8.0, and use organic Adjust the pH to 6.5-7.0 with acid; raise the temperature to 50°C, slowly add 1g of 10% 2,6-bis[(dimethylamino)methyl]phenol aqueous solution dropwise, and react for 0.5 hours; continue to raise the temperature to 60°C, and react for 3 hours; Lower the temperature of the solution to 30°C, add 4g of ethy...

Embodiment 2

[0054] 10% Beta-cyhalothrin microcapsule suspension

[0055] The preparation method is the same as in Example 1, except that the amount of "10% 2,6-bis[(dimethylamino)methyl]phenol aqueous solution" is increased to 4g.

[0056] The encapsulation rate of this sample is 94.2%; the suspension rate is 92%; the dumping residue is less than 0.5%; the 75 μm wet sieve residue is less than 0.5%; the persistent foaming property is less than 20 mL; the freeze-thaw stability is qualified; the thermal storage stability is qualified .

[0057] Scanning electron microscope picture as Figure 4 As shown, the diameter of the circular hole 4 on the capsule wall is 500-1000 nm, and the number of holes increases.

[0058] Compared image 3 and Figure 4 It can be seen that increasing the amount of 2,6-bis[(dimethylamino)methyl]phenol can increase the number and size of pores on the capsule wall.

Embodiment 3

[0060] 20% pendimethalin microcapsule suspension

[0061] Take by weighing 20.62g 97% pendimethalin former medicine, 10g150# solvent naphtha, 5.5g novolac epoxy resin, 0.35g polyisocyanate, 0.5g 2,6-bis[(dimethylamino)methyl]phenol and stir to obtain Oil phase; dissolve 0.1g polyvinyl alcohol, 5.4g calcium lignosulfonate, and 2.2g castor oil polyoxyethylene ether in 50g water, and stir evenly to obtain the water phase; at 30°C, mix the oil phase and the water phase, Homogeneous emulsification to obtain a stable O / W emulsion; then transfer the emulsion to a three-necked flask, stir at 300 rpm; slowly add 10% diamine aqueous solution dropwise, adjust the pH=7.5-8.0, and use organic Adjust the pH to 6.5-7.0 with acid; raise the temperature to 50°C, slowly add 1.5g of 10% 2,6-bis[(dimethylamino)methyl]phenol aqueous solution dropwise, and react for 0.5 hours; continue to raise the temperature to 60°C, and react for 3 hours ; Lower the temperature of the solution to 30°C, add 4g o...

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Abstract

The invention discloses a microcapsule with porous double-layer capsule wall and a preparation method of the microcapsule and belongs to the technical field of microcapsules. The microcapsule has the advantages that the microsphere hole forming technology is used to modify an epoxy resin material to prepare the porous microcapsule, capsule core substance releasing is achieved by regulating pores, the microcapsule technology can be favorably developed from slow release to controlled release, and quite important practical significance is achieved; the microcapsule has the pores in the capsule wall material, the size and number of the pores can be regulated to control the capsule core substance releasing, and the microcapsule is widely applicable to multiple fields such as agriculture, printing and dyeing, ink and phase-change materials; the encapsulation efficiency of a microcapsule suspending agent prepared by the microcapsule is not smaller than 90%, the particle size range of more than 95% of particles of the microcapsule suspending agent is 0.2-30 micrometers, the suspending rate of the microcapsule suspending agent is not smaller than 90%, the persistent foaming property of the microcapsule suspending agent is not larger than 20mL, the pH of the microcapsule suspending agent is 7.0-10.0, and the microcapsule suspending agent is qualified in thermal storage stability and cold storage stability.

Description

technical field [0001] The invention relates to the technical field of microcapsules, in particular to a porous double-walled microcapsule and a preparation method thereof. Background technique [0002] Microcapsules are microscopic containers or packages with polymeric walls. Microcapsule granulation technology is to embed and seal solid, liquid or gas in a microcapsule to become a solid particle product. Since the emergence of microcapsule technology, it has been applied in many fields such as medicine, veterinary medicine, pesticide, fertilizer, cosmetics, spices, food, copy paper, and adhesive. [0003] With people's understanding of the microstructure of matter, it has become the consensus of scientists to obtain multifunctional application characteristics through the formation of the microstructure of matter, and the porous structure of materials has attracted much attention. [0004] In many fields of application, microcapsules are required to have both good stabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/16
CPCB01J13/16
Inventor 刘峰慕卫张大侠张宪鹏罗健
Owner SHANDONG AGRICULTURAL UNIVERSITY
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