액상 무기재료를 활용한 시멘트 복합재료 혼합용 자기치유 마이크로 캡슐의 제조 특성에 관한 실험적 연구

The Experimental Study on Preparation Characteristics of Self-healing Microcapsules for Mixing Cement Composites Utilizing Liquid Inorganic Materials

Abstract

본 연구에서는 시멘트 복합재료와 직접 혼합 가능한 액상 무기재료 활용 자기치유 마이크로 캡슐을 제조하고자 하였다. 액상 무기재료의 기초특성을 평가하였으며, 마이크로 캡슐화를 수행하였다. 또한 본 논문의 포커스는 자기치유 마이크로 캡슐의 치유 효과보다는 시멘트 복합재료에 적용하기 위한 품질 및 제조 특성에 대하여 검토하였다. 자기치유 마이크로 캡슐은 상온에서 안정하고 균열 추종성이 큰 액상 무기재료를 캡슐화하였으며, 수득률은 90% 이상으로 나타났다. 자기치유 마이크로 캡슐의 크기는 합성 교반 속도에 따라 크기를 변화할 수 있었으며, 목표 크기에 대하여 70% 이상 확보할 수 있었다. 또한 자기치유 마이크로 캡슐의 막강화를 통하여 10% 이내의 손실량이 발생하는 것으로 나타났으며, 막 강화를 하지 않은 것과 비교하여 50% 저감할 수 있었다.

In this study, we tried to fabricate self - healing microcapsules using liquid inorganic materials which can be mixed directly with cement composites. The basic properties of the liquid inorganic material were evaluated and microencapsulation was performed. The focus of this paper is on the quality and manufacturing characteristics of cement composites rather than the healing effects of self - healing microcapsules according to mixed capsules. Test results, the self-healing microcapsules encapsulate liquid inorganic material which is stable at room temperature and has high crack followability, and the yield is over 90%. The size of self - healing microcapsule was able to change according to the synthetic agitation speed and it was able to secure more than 70% of target size. In addition, the loss of less than 10% was found to occur through the membrane strengthening of self - healing microcapsules, and it could be reduced by 50% compared with the case without membrane strengthening.

Fig. 1. Reaction mechanism of liquid inorganic material

Fig. 2. Manufacture of arbitrary cracked specimen

Fig. 3. Test method of crack followability and curing state

Fig. 4. Encapsulation mechanism

Fig. 5. Encapsulation process

Fig. 6. Encapsulation equipment

Fig. 7. Example of stability evaluation result at ordinary temperature

Fig. 8. Representative forms of gelled materials

Fig. 9. Crack cross-section of TS-1

Fig. 10. Crack cross-section of TS-7

Fig. 11. Size of microcapsules according to RPM of stirrer

Fig. 12. Size distribution curve of microcapsules

Fig. 13. Spectrum analysis

Fig. 14. Form of microcapsule after mixing with cement composite

Fig. 15. Evaluation of dispersibility of microcapsules

Table 1. Composition ratio of liquid inorganic material

Table 2. Mixing ratio of liquid inorganic material

Table 3. Mix ratio

Table 4. Microcapsule loss and residual amount