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
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[0047] Example 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, add magnesium sulfate dropwise to the sodium hydroxide solution, after the dropwise addition, the 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. get 1000 parts of magnesium hydroxide alkaline water phase prepared by the present invention as water phase, 60 parts of acrylonitrile, 30 parts of methyl methacrylate, 10 parts of methyl acrylate, 1 part of azobisisoheptanenitrile, diethylene 0.5 part of benzene, 0.05 part of isobutane, 1 part of chemical foaming agent azobisisobutyronitrile (decomposition temperature 98-110 ℃), mixed evenly to obtain an oil phase, the polymerization temperature is 45 ℃, the polymerization time is 20h, and then according to this According to the method for preparing ...
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[0050] Example 2
[0051] S1. In 2kg deionized water, add 400g silica sol, 0.05% surfactant sodium dibutylnaphthalene sulfonate, adjust the pH to 4 with HCl solution, and then vigorously stir for 0.5h to obtain an acidic silica sol aqueous phase;
[0052] S2. take 1000 parts of the prepared silica sol water phase of the present invention as the water phase, 60 parts of acrylonitrile, 30 parts of methyl methacrylate, 10 parts of methyl acrylate, 1 part of azobisisoheptanenitrile, 0.5 part of divinylbenzene, 0.05 part of isobutane, 1 part of chemical foaming agent azobisisobutyronitrile (decomposition temperature 98-110 ℃), mixed uniformly to obtain an oil phase, the polymerization temperature is 45 ℃, the polymerization time is 20h, and then the expandable according to the present invention The microsphere preparation method prepares the expandable microsphere containing the chemical foaming agent azobisisobutyronitrile. The particle size of the microsphere is 16um, T s =105℃...
Example Embodiment
[0060] Example 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, add magnesium sulfate dropwise to the sodium hydroxide solution, after the dropwise addition, the 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. get 1000 parts of magnesium hydroxide alkaline aqueous phase prepared by the present invention as water phase, 60 parts of acrylonitrile, 30 parts of methyl methacrylate, 10 parts of methacrylic acid, 1 part of azobisisoheptanenitrile, diethylene 0.5 part of benzene, 0.05 part of isopentane, 1 part of chemical foaming agent 4,4-bisphenylsulfonyl hydrazide (decomposition temperature 140-160 ℃), mixed evenly to obtain oil phase, polymerization temperature is 45 ℃, polymerization time is 20h , and then according to the preparation method of the expandabl...
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