Method for preparing expanded microspheres under normal pressure through visible light initiation

A technology of expanding microspheres and visible light, which is applied to the preparation of expanded microspheres by visible light-induced suspension polymerization and the preparation of expanded microspheres, can solve the problems of harsh polymerization conditions, low foaming ratio of microspheres, uncontrollable molecular weight distribution range, etc. Controllable reaction, good hydrophilic and lipophilic properties, and the effect of short reaction time

Inactive Publication Date: 2021-03-02
河南聚元新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] All in all, the existing polymerization methods have certain limitations in the process of preparing expanded microspheres: (1) the polymerization conditions are harsh, requiring high temperature and high pressure for a long time to react; (2) the range of molecular weight distribution is uncontrollable; (3) the foaming of microspheres Many shortcomings such as low magnification

Method used

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  • Method for preparing expanded microspheres under normal pressure through visible light initiation
  • Method for preparing expanded microspheres under normal pressure through visible light initiation
  • Method for preparing expanded microspheres under normal pressure through visible light initiation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] In 600g of deionized water, add 40g of colloidal silicon dioxide with an active ingredient of 30%, 1g of KURARAY POVAL48-80 and 1g of EDTA·4Na, stir the resulting mixture evenly to obtain an aqueous dispersion medium, and adjust the pH value to 4.5. Mix AN (60.0g), MAN (80.0g), MMA (50.0g), MAA (10.0g), EGDMA (0.4g), IP (70.0g), photosensitizer 1 (20.0g), DDMA-GMA (82.31 g) mixing evenly to prepare an oil phase mixture.

[0093] The aqueous dispersion medium and the oily mixture were mixed and cooled to 5-10° C., and the resulting mixture was dispersed at a speed of 7000 rpm for 3 minutes using a homomixer (manufactured by PRIMIX, TK homomixer) to prepare a suspension. The suspension was transferred to a round bottom flask with a capacity of 2.0 L, and after nitrogen substitution, the reactant was stirred under the irradiation of a 30W white LED, etc., and reacted and polymerized at 25°C for 4 hours, and the resulting product was filtered and dried to obtain expandable...

Embodiment 2～6

[0095] The specific steps are as in Example 1, and the amount of raw materials is adjusted, as shown in Table 1.

[0096] Table 1

[0097]

[0098]

[0099] Compared with the previous preparation method of expanded microspheres, the present invention can quickly prepare expanded microspheres at normal temperature and pressure, and has the advantages of simple operation, mild reaction conditions, fast polymerization rate, high monomer conversion rate and low monomer residual content. Low, do not use sodium chloride in the reaction formula and other advantages.

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Abstract

The invention discloses a method for preparing expanded microspheres under normal pressure through visible light initiation, which comprises the following steps of uniformly mixing an oil-phase composition containing a metal photosensitizer, a photoinitiator, low-boiling-point alkane and an olefin polymerization monomer with an aqueous-phase composition containing water, inorganic nanoparticles and a suspending agent to form a suspension, and enabling the suspension liquid to be subjected to a suspension polymerization reaction through visible light initiation to obtain theexpanded microspheres. The expanded microsphere prepared by the method has the advantages of high expansion ratio, short polymerization time, high monomer conversion rate, low monomer residual rate and the like.

Description

technical field [0001] The invention relates to a preparation method of expanded microspheres, in particular to a method for preparing expanded microspheres by visible light-induced suspension polymerization, and belongs to the technical field of expanded microspheres preparation. Background technique [0002] Expanded microspheres refer to micro-particles with a core-shell structure formed by wrapping a foaming agent with a thermoplastic polymer shell. When the microspheres are heated to the softening point of the polymer shell, the vapor pressure generated by the blowing agent expands the microspheres, and after cooling, the microspheres remain hollow. Due to the characteristics of light weight and closed-cell foaming of expanded microspheres, the expanded microspheres have a wide range of applications in heat insulation, sound insulation, and weight reduction. [0003] At present, the conventional preparation method of expanded microspheres is to prepare expanded microsp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/46C08F220/14C08F220/06C08F222/14C08F2/50C08F2/18
CPCC08F220/46C08F220/06C08F2/50C08F2/18C08F220/14C08F222/102
Inventor 冯小刚
Owner 河南聚元新材料科技有限公司
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