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A platform for research: civil engineering, architecture and urbanism
Special powder polycarboxylate superplasticizer for machine-made aggregate and preparation method of special powder polycarboxylate superplasticizer
The invention discloses a special powder polycarboxylate superplasticizer for machine-made aggregate and a preparation method of the special powder polycarboxylate superplasticizer. A boric acid group and a catechol group are introduced into a traditional polycarboxylic acid molecular chain, a boric acid ester bond is formed by adjusting the pH value, and polycarboxylic acid molecules can be crosslinked, so that the solubility of a product can be effectively reduced, the melting point of the product is increased, the drying temperature is reduced, and the drying efficiency is improved; the damage of a conventional high-temperature drying mode to the performance of the powder polycarboxylic acid is avoided, and the storage stability of the powder polycarboxylic acid product is also ensured. The boric acid ester bond can quickly perform reversible coordination exchange in the cement paste to be dissociated, so that the powdery polycarboxylic acid can quickly change into a linear structure in the cement paste to be quickly dissolved, and a water reducing effect is achieved. Besides, the catechol monomer contained in the molecular chain can enable the molecular chain to have stronger adsorption and adhesion capability, so that the cement paste is more easily adsorbed on the surface of the machine-made aggregate with lower surface energy, and the workability, the working performance, the mechanical property and the durability of the machine-made aggregate concrete can be effectively improved.
本发明公开了一种机制骨料专用粉体聚羧酸减水剂及其制备方法。本发明在传统聚羧酸分子链中引入了硼酸基团和邻苯二酚基团，通过调节pH值形成硼酸酯键可以对于聚羧酸分子进行交联，可有效降低产物溶解度，提升产物熔点，降低干燥温度，提升干燥效率，避免了常规高温干燥方式对于粉体聚羧酸性能的损伤，也保证了粉体聚羧酸产品的储存稳定性。由于硼酸酯键在水泥浆体中可以快速进行可逆配位交换作用而发生解离，使粉体聚羧酸可以在水泥浆体中迅速变为线性结构从而快速溶解，发挥减水作用。另外，分子链中含有的邻苯二酚单体可以使分子链具有较强的吸附粘接能力，使水泥浆体更容易吸附在表面能较低的机制骨料表面，因此可以有效改善机制骨料混凝土的和易性、工作性能及力学和耐久性能。
Special powder polycarboxylate superplasticizer for machine-made aggregate and preparation method of special powder polycarboxylate superplasticizer
The invention discloses a special powder polycarboxylate superplasticizer for machine-made aggregate and a preparation method of the special powder polycarboxylate superplasticizer. A boric acid group and a catechol group are introduced into a traditional polycarboxylic acid molecular chain, a boric acid ester bond is formed by adjusting the pH value, and polycarboxylic acid molecules can be crosslinked, so that the solubility of a product can be effectively reduced, the melting point of the product is increased, the drying temperature is reduced, and the drying efficiency is improved; the damage of a conventional high-temperature drying mode to the performance of the powder polycarboxylic acid is avoided, and the storage stability of the powder polycarboxylic acid product is also ensured. The boric acid ester bond can quickly perform reversible coordination exchange in the cement paste to be dissociated, so that the powdery polycarboxylic acid can quickly change into a linear structure in the cement paste to be quickly dissolved, and a water reducing effect is achieved. Besides, the catechol monomer contained in the molecular chain can enable the molecular chain to have stronger adsorption and adhesion capability, so that the cement paste is more easily adsorbed on the surface of the machine-made aggregate with lower surface energy, and the workability, the working performance, the mechanical property and the durability of the machine-made aggregate concrete can be effectively improved.
本发明公开了一种机制骨料专用粉体聚羧酸减水剂及其制备方法。本发明在传统聚羧酸分子链中引入了硼酸基团和邻苯二酚基团，通过调节pH值形成硼酸酯键可以对于聚羧酸分子进行交联，可有效降低产物溶解度，提升产物熔点，降低干燥温度，提升干燥效率，避免了常规高温干燥方式对于粉体聚羧酸性能的损伤，也保证了粉体聚羧酸产品的储存稳定性。由于硼酸酯键在水泥浆体中可以快速进行可逆配位交换作用而发生解离，使粉体聚羧酸可以在水泥浆体中迅速变为线性结构从而快速溶解，发挥减水作用。另外，分子链中含有的邻苯二酚单体可以使分子链具有较强的吸附粘接能力，使水泥浆体更容易吸附在表面能较低的机制骨料表面，因此可以有效改善机制骨料混凝土的和易性、工作性能及力学和耐久性能。
Special powder polycarboxylate superplasticizer for machine-made aggregate and preparation method of special powder polycarboxylate superplasticizer
一种机制骨料专用粉体聚羧酸减水剂及其制备方法
GUAN WENXUN (author) / CHENG GUANZHI (author) / XIE YONGJIANG (author) / WANG XI (author) / TAN YANBIN (author) / WENG ZHICAI (author) / FENG ZHONGWEI (author) / LI XIANGTAO (author) / LIU ZIKE (author) / ZHENG XINGUO (author)
2023-03-21
Patent
Electronic Resource
Chinese
| European Patent Office | 2022
| European Patent Office | 2023
Preparation method of polycarboxylate superplasticizer powder
| European Patent Office | 2023
| European Patent Office | 2023