Bead suspension polymerization method for methyl methacrylate

A technology of methyl methacrylate and suspension polymerization, which is applied in the field of preparation of dentifrice and dental tray powder, and can solve the problems of undisclosed PMMA particle preparation methods, etc.

Inactive Publication Date: 2011-04-27
HERAEUS DENTAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] But above-mentioned patent document all does not disclose the prep...

Method used

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  • Bead suspension polymerization method for methyl methacrylate
  • Bead suspension polymerization method for methyl methacrylate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A 1000ml glass four-necked flask, a glass reflux condenser, a magnetic electric stirrer (JB50-D type, manufactured by Shanghai Specimen Model Factory), a glass thermometer, and an electric heating mantle (DRT-TW type, manufactured by Zhengzhou Changcheng Technology Industry and Trade Co., Ltd.) connect.

[0051] Prepare the aqueous phase at room temperature: 432 g of deionized water, 1 g of polyvinylpyrrolidone K90 (manufactured by Hangzhou Nanhang Science and Technology Development Co., Ltd.), 0.02 g of polyvinylpyrrolidone K30 (manufactured by Hangzhou Nanhang Science and Technology Development Co., Ltd.), sodium polyacrylate (Henan Nanhang Science and Technology Development Co., Ltd.) Xinxiang Zhonghe Resin Co., Ltd.) 2.5g, hydroxyethyl cellulose H2000 (manufactured by Guangzhou Bangle Chemical Raw Materials Co., Ltd.) 0.1g, ammonium thiocyanate (manufactured by Yixing No. 2 Chemical Reagent Factory) 0.4g, mixed and fully Stir until the aqueous solution is transparen...

Embodiment 2-4

[0056] The samples of Examples 2-4 were prepared according to the method of Example 1. The reagents used and the samples prepared are listed in Table 3.

[0057] Table 3 The reagents used in Examples 1 to 4 and the samples prepared Unit: gram

[0058]

[0059] *It can be added in the middle of the reaction, or added to the water phase when preparing the water phase.

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Abstract

The invention discloses a bead suspension polymerization method for methyl methacrylate, which comprises a step of mixing an oil phase and an aqueous phase to carry out a suspension polymerization reaction. The oil phase comprises a methyl methacrylate monomer and an oil-soluble radical initiator; the aqueous phase comprises water and at least three suspending agents, namely a cellulose surfactant, a vinyl pyrrolidone polymer nonionic surfactant and an acrylic polymer anionic surfactant. In the method, a polymerization reaction system is stable and easy to control, the polymerization reaction period is shortened, the yield is improved, and the method is low in cost. Meanwhile, the polymethyl methacrylate (PMMA) polymer particles prepared by the method meet the service conditions for manufacturing artificial resin teeth.

Description

technical field [0001] The present invention relates to methyl methacrylate (hereinafter referred to as MMA) bead suspension polymerization method, the polymethyl methacrylate (hereinafter referred to as PMMA) particle prepared by the method is especially suitable for preparing dentifrice and dental tray powder (production of artificial resin raw materials for teeth). Background technique [0002] The polymerization reaction in which the monomer is suspended and dispersed in the medium (usually water) in the form of small droplets is called suspension polymerization. Suspension polymerization overcomes the problem of heat dissipation in bulk polymerization and is beneficial to the control of the reaction, so it is a polymerization method widely used in industry. In MMA suspension polymerization, the monomer is suspended and dispersed in water in the form of small droplets by strong stirring and with the help of suspending agent, and the polymerization reaction is carried ou...

Claims

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Application Information

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IPC IPC(8): C08F120/14C08F2/20
Inventor 朱小慧朱中岳
Owner HERAEUS DENTAL
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