Pilot production of novel polyether macromonomer by CBMA
Release time: 2023/06/12 Publisher： original Views：
Introduction
2022 NEXCEL Project TDA-3 Research and Application of Novel Polyether macromonomer and Ultra-highly Dispersing Polycarboxylate Superplasticizer (PCE) is being implemented by China Building Materials Academy (CBMA) and CNBM Zhongyan Technology (Zhongyan). Both sides jointly designed the molecular structure and developed synthesis technology for novel polyether. Recently, the pilot production of novel polyether macromomer was completed in the plant of Liaoning Kelong Fine Chemical (Kelong Shares).
Due to the cis-trans isomerism and straight-chain structure, conventional polyether macromonomer, as the side chains of superplasticizer exhibits weaknesses such as limited swing freedom, low steric hindrance, which lead to poor workability and rapid loss of concrete slump. In response to the inadequate performance of existing superplasticizer, the project team optimized the molecular structure of polyether macromonomer and introduced a molecular model with topological structure, resulting in a process route for hyperbranched polyether macromonomer.
After a one-year study, numerous small-scale experiments and proportional scaling experiments were carried out to replace reagent-grade raw materials with industrial materials. Project team completed the pilot production of novel polyether macromonomer after repeated validations and parameters optimization, eventually prepared an ultra-highly dispersing PCE successfully. Results of concrete performance tests showed that the water reduction rate of novel superplasticizer was greater than 45% , and particularly when applied to typical UHPC materials with the water-binder ratio being as low as 0.18, it achieved 20% reduction in concrete viscosity and compressive strength exceeding 155 MPa, which demonstrated the high dispersibility and water-reducing effect of superplasticizer at low dosage. Furthermore, the novel ultra-highly dispersing PCE exhibited wide adaptability to cement, effectively reducing concrete shrinkage and improving durability of concrete.
Mechanism of ultra-highly dispersing PCE
Project PI
Bai Jie
Professor
CBMA
About CBMA
China Building Materials Academy(CBMA) is China’s first research institution of building materials and also known as “The cradle of building materials technology in new China”. CBMA is the comprehensive scientific research and development institute, which is largest in scale and most powerful in strength regarding to professional fields of China building materials and inorganic non-metal materials.