Thermal expansion microsphere and preparation method thereof

The preparation of thermally expanded microspheres through suspension polymerization has solved the problems of uneven particle size distribution, irregular morphology, low foaming ratio and poor foaming performance in the prior art, and achieved an efficient and rapid preparation process and excellent microsphere performance, which is suitable for industrial production.

CN119708601APending Publication Date: 2025-03-28GUIZHOU RES INST OF CHEM IND +1
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Patent Information

Application Number
CN202411881568.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

It is difficult to synthesize thermal expansion microspheres with uniform particle size distribution, regular morphology, high foaming ratio and superior foaming performance in the prior art, and there are problems of complex process control and high equipment requirements in industrial production.

Method used

Thermal expansion microspheres were prepared by suspension polymerization, and foamed microsphere particles were prepared with acrylonitrile, methacrylic acid, methyl methacrylate, and glycidyl methacrylate as monomers, azobisisobutyronitrile as initiator, silica as a stabilized dispersant, and trimethylolpropane trimethacrylate as crosslinking agent to produce foamed microsphere particles with an average particle size of 12-35 μm, moisture <2.5%, and foaming ratio >28.

Benefits of technology

It achieves fast reaction speed, short preparation cycle, comparable performance and yield of thermally expanded microspheres, improves production efficiency, and is easy to control the process, and is suitable for large-scale industrial production.

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Abstract

The invention belongs to the technical field of thermal expansion microspheres, and particularly relates to a thermal expansion microsphere and a preparation method thereof, the best process for preparing the thermal expansion microsphere is screened out by comparing and selecting different dispersants, initiators and cross-linking agents and comparing the performance difference of the thermal expansion microsphere prepared under different reaction control conditions. According to the present invention, the thermal expansion microsphere prepared by using the process has good effects of accelerating the decomposition rate of ANBI, improving the polymerization reaction speed at the later stage and shortening the reaction in the manner of half-process supplementation of the initiation catalyst during the polymerization reaction, and the multi-batch verification results show that the thermal expansion microsphere prepared by using the process has characteristics of small yield and small product performance fluctuation among the batches, and has good application prospects. Products are subjected to application proofing tests, the performance of the products reaches the level of the best similar products in the current market, and the process has conditions for industrial large-scale production conversion.
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