CAJ | 학술논문

磷酸镁水泥(MP C )力学性能优异,在民用、军事建筑和医用材料领域都有广泛应用前景。但MP C 在经受水环境侵蚀时,强度损失较快,故改善MP C抗水性是一个重要的研究方向。研究了壳聚糖(CS)对MPC浆体凝结时间、强度及晶相结构影响,并研究了掺入CS后MPC硬化体在水、模拟体液(SBF)、磷酸盐缓冲溶液(PBS)中浸泡不同周期后强度及结构变化。结果表明,硼砂作为缓凝剂可明显延长 MP C的凝结时间；MPC 主要水化产物为 MgKPO4?6 H2 O,存在未参与反应硼砂和大量剩余 MgO；添加 CS 可使MP C硬化体结构更加致密,在经受水环境侵蚀时, MPC硬化体的强度损失明显减小,说明 CS 能提高MPC的抗水性；同时,由于 MPC 硬化体在 SBF 中浸泡后表面有球状类骨磷灰石晶体生成,说明其具有生物活性。
린산미수니(MP C )역학성능우이,재민용、군사건축화의용재료영역도유엄범응용전경。단MP C 재경수수배경침식시,강도손실교쾌,고개선MP C항수성시일개중요적연구방향。연구료각취당(CS)대MPC장체응결시간、강도급정상결구영향,병연구료참입CS후MPC경화체재수、모의체액(SBF)、린산염완충용액(PBS)중침포불동주기후강도급결구변화。결과표명,붕사작위완응제가명현연장 MP C적응결시간；MPC 주요수화산물위 MgKPO4?6 H2 O,존재미삼여반응붕사화대량잉여 MgO；첨가 CS 가사MP C경화체결구경가치밀,재경수수배경침식시, MPC경화체적강도손실명현감소,설명 CS 능제고MPC적항수성；동시,유우 MPC 경화체재 SBF 중침포후표면유구상류골린회석정체생성,설명기구유생물활성。
Magnesium phosphate cement (MPC)has excellent mechanical performance,which can be applied in civilian,military buildings and medical materials.However,the strength of MPC decreases fast because of wa-ter erosion.The method to improve the water resistance of MPC was an important research direction.This pa-per studied the influence of chitosan on setting time,strength and the crystalline structure of MPC paste.And the strength and structural change of MPC hardened paste was studied after soaked with different cycles in wa-ter(H2 O),simulated body fluid (SBF),phosphate buffered solution (PBS).The results show that:borax as a retarder can significantly prolong the setting time of MPC;unreacted borax and a large amount of over plus MgO exist in MPC and the main hydration products of MPC was MgKPO4?6 H2 O;the addition of chitosan can make the structure of MPC hardened paste more compact.Since chitosan improved the water resistance of MPC,the loss of strength of MPC due to water erosionwas significantly reduced.The biological activity of MPC hardened paste was confirmed by the formation of spherical bone-like apatite crystal on its surface after socked in SBF.