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Physical expansion foaming microsphere coated with diisopropyl azodicarboxylate and preparation method thereof

A technology for wrapping diisopropyl azodicarboxylate and diisopropyl azodicarboxylate, which is applied in the field of physically expanded foamed microspheres and its preparation, and can solve problems such as thermal runaway, poor compatibility, and danger , to improve the stability of the

Active Publication Date: 2021-01-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Diisopropyl azodicarboxylate has the following disadvantages as a liquid blowing agent: 1) Diisopropyl azodicarboxylate has a darker color, When it is used for foaming white or colorless products, it is easy to cause product dyeing; 2) Diisopropyl azodicarboxylate is a low-polarity foaming agent, when used in polyurethane, alkyd resin, cyanamide resin, etc. There are problems such as poor compatibility and uneven foaming when strong polar polymers are foamed; 3) Diisopropyl azodicarboxylate is a liquid azo compound, which is prone to occurrence during production, transportation, use and storage. Danger due to thermal runaway

Method used

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  • Physical expansion foaming microsphere coated with diisopropyl azodicarboxylate and preparation method thereof
  • Physical expansion foaming microsphere coated with diisopropyl azodicarboxylate and preparation method thereof
  • Physical expansion foaming microsphere coated with diisopropyl azodicarboxylate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The raw material composition formula of microsphere is as follows: methyl methacrylate: 14g; Phenyl methacrylate: 4g; Diisopropyl azodicarboxylate: 7g; Azobisisoheptanonitrile: 400mg; ) peroxydicarbonate: 450 mg; 1,4-butylene glycol dimethacrylate: 0.055 g. Deionized water: 112ml; polyvinyl alcohol 1788: 0.56g; sodium chloride: 5.6g.

[0030] According to above-mentioned formula, prepare according to the following method:

[0031] (1) Get methyl methacrylate, phenyl methacrylate, diisopropyl azodicarboxylate, initiator azobisisoheptanonitrile and two (tert-butylcyclohexane) peroxydicarbonate, crosslinking agent 1,4-Butanediol Dimethacrylate, fully stirred and mixed to obtain an oil phase solution. Nitrogen gas was bubbled into the oil phase solution to remove oxygen for 10 minutes.

[0032] (2) Take deionized water, polyvinyl alcohol 1788, and sodium chloride, stir and mix well to make an aqueous phase solution. Nitrogen was blown into the aqueous phase solution to ...

Embodiment 2

[0037] The preparation method is the same as in Example 1. The raw material composition formula of the microspheres is as follows: methyl methacrylate: 14g; phenyl methacrylate: 2g; diisopropyl azodicarboxylate: 10g; azobisisoheptanonitrile: 850mg; 3-Butanediol ester: 0.014 g. Deionized water: 112mL; polyvinyl alcohol 1788: 0.56g; sodium chloride: 5.6g.

[0038] The characterization results showed that the average particle size of the microsphere product produced by the reaction was 247±30 μm. The initial expansion temperature of the microspheres is 172°C, the concentrated foaming temperature is 188°C, and the foaming rupture temperature is 220°C. The expansion ratio of the microspheres is 7.8 times. The appearance of microspheres before and after expansion under the microscope is as follows: figure 2 shown.

Embodiment 3

[0040] The preparation method is the same as in Example 1. The raw material composition formula of microspheres is as follows: methyl methacrylate: 14g; 850mg; 1,4-Butanediol dimethacrylate: 0.01g; 1,3-Butanediol dimethacrylate: 0.03g. Deionized water: 112mL; polyvinyl alcohol 1788: 0.56g; sodium chloride: 5.6g.

[0041]The characterization results showed that the average particle size of the microsphere product produced by the reaction was 510±92 μm. The initial expansion temperature of the microspheres is 170°C, the concentrated foaming temperature is 180°C, and the foaming rupture temperature is 210°C. The foaming expansion ratio of the microspheres is 10.2 times. The appearance of microspheres before and after expansion under the microscope is as follows: image 3 shown.

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Abstract

The invention provides a physical expansion foaming microsphere coated with diisopropyl azodicarboxylate, the foaming microsphere takes polymethyl methacrylate and polyphenyl methacrylate as shell layer materials, an inner core wraps diisopropyl azodicarboxylate liquid, the foaming microsphere can be used for replacing a diisopropyl azodicarboxylate liquid foaming agent, the color is light, the compatibility with polyurethane, alkyd resin, cyanamide resin and other materials is good, and the production, transportation, use and storage safety of the microspheres is high.

Description

technical field [0001] The invention relates to physically expanded foamed microspheres wrapped with diisopropyl azodicarboxylate and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] Thermally expandable physical foamed microspheres are microsphere particles with a core-shell structure that can physically expand at a certain temperature. Generally, the core of thermally expandable microspheres is mostly low-boiling liquid, and the shell is mostly thermoplastic polymer material. When the microsphere is heated to a certain temperature and exceeds the boiling point of the core liquid, the liquid rapidly vaporizes and expands to generate internal pressure, and the shell material is heated and softened. , under the action of internal pressure, the microspheres expand, and the volume increases to several to tens of times the original volume. When the heat-expandable microspheres are used for plastic foaming, they can reduce ...

Claims

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Application Information

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IPC IPC(8): C08J9/32C08J9/10C08F220/14C08F220/18
CPCC08J9/32C08J9/102C08F220/14C08J2203/22C08F220/1806Y02E60/10
Inventor 唐华东朱梦泽
Owner ZHEJIANG UNIV OF TECH
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