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Green synthesis method of epoxy modified starch-based emulsion

A technology of epoxy modification and green synthesis, applied in the field of materials, to achieve the effect of improved performance, good monodispersity and clean surface

Inactive Publication Date: 2019-09-17
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at many problems existing in existing materials, the present invention provides a green synthesis method of epoxy-modified starch-based emulsion, comprising the following steps: (1) firstly, starch or starch derivatives are heated under the action of a catalyst to obtain gelatinized liquid; (2) Dilute and disperse the epoxy resin and the polymerized monomer in a certain ratio without the aid of an organic solvent to obtain a uniformly dispersed mixed solution of the epoxy resin and the polymerized monomer; (3) at a certain temperature, add (4) continue to drop the remaining polymerized monomer and initiator to prepare the shell polymer; (5) obtain epoxy modified starch after heat preservation reaction base emulsion

Method used

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  • Green synthesis method of epoxy modified starch-based emulsion

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Experimental program
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Embodiment 1

[0028] A green synthesis method of epoxy-modified starch-based emulsion, the content of each component in the formula is calculated by mass, and the unit is gram:

[0029] Starch: 30g

[0030] Hydrogen peroxide: 11.25g

[0031] Butyl acrylate: 22.5g

[0032] Styrene: 18g

[0033] Epoxy resin E-44: 4.5g

[0034] Water 100g

[0035] Synthesis:

[0036] 1) Take the components according to the above-mentioned weight parts and set aside;

[0037] 2) First mix the starch and water uniformly and then add it to a four-necked flask, add 4.5g of catalyst hydrogen peroxide, heat to 45-90°C, and control the reaction time within 1-1.5h to obtain a gelatinized liquid with dispersion stability;

[0038] 3) Add butyl acrylate and 3.375g initiator hydrogen peroxide dropwise to the gelatinization solution at the same time, control the temperature at 80°C, dropwise time 60-80min, dropwise finish the heat preservation reaction 0.5-1.0h, prepare the nuclear layer polymerization Substance emulsion

[0039] 4) Add...

Embodiment 2

[0042] A green synthesis method of epoxy-modified starch-based emulsion, the content of each component in the formula is calculated by mass, and the unit is gram:

[0043] Oxidized starch: 30g

[0044] Hydrogen peroxide: 6g

[0045] Butyl acrylate: 10g

[0046] Methyl methacrylate: 20g

[0047] Epoxy resin E-51: 6g

[0048] Ammonium persulfate: 1g

[0049] Water 90g

[0050] Synthesis:

[0051] 1) Take each component according to the above-mentioned weight parts, and set aside;

[0052] 2) First mix the oxidized starch and water uniformly and then add it to a four-necked flask, heat it to 45-90°C under the action of hydrogen peroxide, and control the reaction time within 1-1.5h to obtain a gelatinized liquid with dispersion and stability;

[0053] 3) Dilute and disperse epoxy resin E-51 and butyl acrylate to obtain a uniformly dispersed mixed liquid. Add the mixed liquid dropwise to the gelatinized liquid, control the temperature at 80°C, and add the time for 60-80 minutes, and add at the sam...

Embodiment 3

[0056] A green synthesis method of epoxy-modified starch-based emulsion, the content of each component in the formula is calculated by mass, and the unit is gram:

[0057] Modified starch 30g

[0058] Hydrogen peroxide: 6g

[0059] Butyl acrylate: 10g

[0060] Styrene: 10g

[0061] Epoxy resin E-51: 10g

[0062] Ammonium persulfate: 0.41g

[0063] Sodium bisulfite: 0.19g

[0064] 80g of water

[0065] Synthesis:

[0066] 1) Take the components according to the above-mentioned weight parts and set aside;

[0067] 2) First mix the oxidized starch and water uniformly and then add it to a four-necked flask, heat it to 45-90°C under the action of hydrogen peroxide, and control the reaction time within 1-1.5h to obtain a gelatinized liquid with dispersion stability;

[0068] 3) Dilute and disperse epoxy resin E-51 and butyl acrylate to obtain a uniformly dispersed mixed liquid. Add the dispersed uniformly mixed liquid dropwise to the gelatinized liquid, control the temperature at 80°C, and the dropp...

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Abstract

The invention relates to the field of new materials, and in particular discloses a green synthesis method of epoxy modified starch-based emulsion. The method comprises the following steps: (1) firstly, heating starch or starch derivatives in presence of a catalyst to obtain a gelatinized liquid; (2) diluting and dispersing the epoxy resin and a polymerized monomer in a certain ratio without using an organic solvent so as to obtain a uniformly dispersed mixed liquid of the epoxy resin and the polymerized monomer; (3) dropwise adding part of the polymerized monomer and an initiator into the gelatinized liquid at a certain temperature at the same time to prepare a core layer polymer; (4) continuing to dropwise add a polymerized monomer containing the epoxy resin and the initiator to prepare a shell layer polymer; (5) carrying out a heat preservation reaction to obtain the epoxy modified starch-based emulsion. The emulsion is not only environmentally-friendly, but also has a core-shell structure, and is prepared without using an organic solvent and an emulsifying agent; not only is the emulsion environmentally-friendly, but all properties of the emulsion, especially the chemical resistance and water resistance, are also obviously improved, so that the emulsion can be widely applied to the fields of papermaking, textile and water-based paint.

Description

technical field [0001] The invention relates to the field of materials, in particular to a green synthesis method of epoxy-modified starch-based emulsion. Background technique [0002] Starch is a natural biomacromolecule that is environmentally friendly and cheap. However, the properties of native starch solution are relatively unstable, with large molecular weight and easy retrogradation. These shortcomings limit the application of native starch in many fields. The properties of starch are changed through physical, chemical, biological and other ways, thereby adding some new functional properties, increasing the application range of starch, and broadening the application field of starch. Modified starch has a dispersion and stabilization effect in the emulsion polymerization process. The prepared emulsion has no emulsifier residue, fine particles, high stability and strong penetration, but its adhesion and water resistance are poor; epoxy resin has high cross-linking abili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/10C08F251/00C08F220/18C08F212/08C08F220/14
CPCC08F283/10C08F251/00C08F212/08C08F220/14
Inventor 李少香曲文娟王佳平程家骥刘猛李光俊
Owner QINGDAO UNIV OF SCI & TECH
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