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Expandable microsphere containing chemical foaming agent and preparation method thereof

A technology of chemical foaming agent and expanded microspheres, which is applied in the field of expandable microspheres containing chemical foaming agents and its preparation, can solve problems such as difficult to accurately control the initiation temperature, and achieve the goal of expanding application methods and application fields Effect

Pending Publication Date: 2021-03-30
快思瑞科技(上海)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, expandable microspheres will start to foam before the glass transition temperature, and it is difficult to precisely control the initiation temperature

Method used

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  • Expandable microsphere containing chemical foaming agent and preparation method thereof
  • Expandable microsphere containing chemical foaming agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] S1. prepare 1kg of magnesium sulfate solution of 0.15mol / L, prepare 1kg of sodium hydroxide solution of 0.6mol / L, then under vigorous stirring, magnesium sulfate is added dropwise in the sodium hydroxide solution, after dropping, pH is 9. Add 0.05% surfactant sodium dodecylbenzenesulfonate and continue to stir for 0.5h to obtain the alkaline aqueous phase of magnesium hydroxide;

[0049] S2. Take 1000 parts of the magnesium hydroxide alkaline aqueous phase prepared by the present invention as the water phase, 60 parts of acrylonitrile, 30 parts of methyl methacrylate, 10 parts of methyl acrylate, 1 part of azobisisoheptanonitrile, diethylene 0.5 part of benzene, 0.05 part of isobutane, 1 part of chemical foaming agent azobisisobutyronitrile (decomposition temperature 98-110°C), mix well to obtain an oil phase, the polymerization temperature is 45°C, the polymerization time is 20h, and then according to this The inventive method for preparing expandable microspheres can ...

Embodiment 2

[0051] S1. In 2 kg of deionized water, add 400 g of silica sol, 0.05% surfactant sodium dibutylnaphthalene sulfonate, adjust the pH to 4 with HCl solution, and then vigorously stir for 0.5 h to obtain the acidic silica sol aqueous phase;

[0052] S2. Take 1000 parts of the silica sol water phase prepared by the present invention as the water phase, 60 parts of acrylonitrile, 30 parts of methyl methacrylate, 10 parts of methyl acrylate, 1 part of azobisisoheptanonitrile, 0.5 part of divinylbenzene, 0.05 part of isobutane, 1 part of chemical foaming agent azobisisobutyronitrile (decomposition temperature 98-110°C), mix uniformly to obtain an oil phase, the polymerization temperature is 45°C, the polymerization time is 20h, and then expandable according to the present invention The preparation method of microspheres prepares expandable microspheres containing chemical blowing agent azobisisobutyronitrile. Microsphere particle size is 16um, T s =105°C, T max = 136°C.

[0053] S...

Embodiment 3

[0061] S1. prepare 1kg of magnesium sulfate solution of 0.15mol / L, prepare 1kg of sodium hydroxide solution of 0.6mol / L, then under vigorous stirring, magnesium sulfate is added dropwise in the sodium hydroxide solution, after dropping, pH is 9. Add 0.05% surfactant sodium dodecylbenzenesulfonate and continue to stir for 0.5h to obtain the alkaline aqueous phase of magnesium hydroxide;

[0062] S2. Take 1000 parts of the magnesium hydroxide alkaline aqueous phase prepared by the present invention as the water phase, 60 parts of acrylonitrile, 30 parts of methyl methacrylate, 10 parts of methacrylic acid, 1 part of azobisisoheptanonitrile, diethylene 0.5 parts of benzene, 0.05 parts of isopentane, 1 part of chemical foaming agent 4,4-oxybisbenzenesulfonyl hydrazide (decomposition temperature 140-160°C), mix well to obtain an oil phase, the polymerization temperature is 45°C, and the polymerization time is 20h , and then according to the preparation method of the expandable micr...

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Abstract

The invention provides an expandable microsphere containing a chemical foaming agent and a preparation method of the expandable microsphere, and belongs to the technical field of material preparation;the expandable microsphere containing the chemical foaming agent is composed of a polymer resin shell and a core material contained in the shell, and the polymer resin shell is formed by polymerizingmonomers in the presence of an initiator and a cross-linking agent. The core material is composed of a physical foaming agent and a chemical foaming agent which do not participate in free radical polymerization. According to the invention, the chemical foaming agent and the physical foaming agent are used as main core materials of the expandable microsphere, the problem of foaming agent leakage of the expandable microsphere after a period of time is solved; in addition, the initial foaming temperature of the microsphere can be accurately controlled by using the technical means provided by theinvention.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to an expandable microsphere containing a chemical foaming agent and a preparation method thereof. Background technique [0002] The expandable microsphere is a polymer plastic microsphere with a core-shell structure composed of an airtight thermoplastic polymer shell and a hydrocarbon (C4-C12 alkane) as the core. At room temperature, hydrocarbons are confined by the polymer shell and exist in the core in a two-phase coexistence state. When the microsphere is heated, the hydrocarbon vaporizes and the pressure inside the microsphere increases. At the same time, when the polymer shell reaches its glass Transition temperature (T g ), the shell becomes soft and malleable. When the internal pressure of the microspheres exceeds the yield strength of the polymer, the microspheres begin to swell, and the density drops dramatically because the mass remains the same while the v...

Claims

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Application Information

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IPC IPC(8): C08J9/20C08J9/10C08J9/14C08F220/44C08F220/14C08F212/36
CPCC08J9/20C08J9/102C08J9/141C08F220/44C08J2203/22C08J2203/14C08J2203/04C08J2203/184C08F220/14C08F212/36
Inventor 成晓军刘利利
Owner 快思瑞科技(上海)有限公司
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