A kind of high temperature resistant super retarder with good dispersibility and preparation method thereof

Abstract

The invention relates to a high-temperature-resistant super retarder with favorable dispersibility and a preparation method thereof. The invention aims to provide a high-temperature-resistant super retarder with favorable dispersibility adaptable to high temperature in summer and a preparation method thereof. The high-temperature-resistant super retarder with favorable dispersibility comprises the following components in parts by weight: 300-450 parts of organophosphorous acid or organic phosphorus salt, 150-300 parts of dispersant and 15-25 parts of surfactant. The preparation method comprises the following steps: proportionally adding raw materials into a reaction kettle, uniformly mixing and stirring, adding 300-400 parts by weight of water, and dissolving by stirring to obtain the product. The high-temperature-resistant super retarder provided by the invention solves the problem of high temperature adaptability of the retarder, is convenient for construction in summer, can adapt to multiple water reducers, is applicable to C40 above high-strength concrete, can prolong the retention time of concrete flowability by more than 0.5 hour, is convenient for concrete transportation, and has the advantages of simple production technique and low cost.

Description

technical field [0001] 本发明涉及一种建筑施工用的超缓凝剂,具体涉及一种具有良好分散性能的耐高温超缓凝剂及其制备方法。 Background technique [0002] 缓凝剂是延缓混凝土凝结时间而对后期强度无明显影响的外加剂。现有技术中,常用的混凝土缓凝剂分为无机和有机两大类。 [0003] 无机缓凝剂主要包括硼砂、氧化锌、磷酸盐和偏磷酸盐等,如授权号为CN101891410B的专利文献“一种粉状石膏缓凝剂的制备方法”就公开了以柠檬酸和硼砂为主要缓凝成分、灰钙粉为改性增强剂而制备的一种缓凝剂。 [0004] 有机缓凝剂主要包括木质素磺酸盐、羟基羧酸(盐)、糖类及碳水化合物、多元醇及其衍生物等,如申请号为201310072028.1的专利文献“一种改性铝酸盐水泥缓凝剂及制备方法”公开了一种缓凝剂为木质素磺酸钠接枝聚合物,其接枝单体为2-丙烯酰胺基-2-甲基丙磺酸、衣康酸,被接枝组分为木质素磺酸钠,引发剂为过硫酸钾溶液。 [0005] 但是,这些缓凝剂均存在不足: [0006] 1、无机类缓凝剂掺量大,且随着掺量增加对混凝土凝结时间影响不大,却大幅降低混凝土强度; [0007] 2、有机缓凝剂掺量小,凝结时间长,但其掺量范围小,随掺量变化凝结时间波动大,当掺量超过一定值后,混凝土会出现异常凝结、强度下降等问题。 Contents of the invention [0008] 本发明的主要目的是提供一种适应夏季高温的具有良好分散性能的耐高温超缓凝剂及其制备方法。 [0009] 为实现上述目的,本发明采用的技术方案为:一种具有良好分散性能的耐高温超缓凝剂,包括如下重量份组分:有机磷酸或有机磷盐300-450份、分散剂150-300份、表面活性剂15-25份。 [0010] 本发明配方可以加水形成液体在混合水泥砂浆时直接加入使用,也可以不加水在混合水泥砂浆时,先用水溶解搅拌均匀后再加入砂浆中使用。 [0011] 进一步优选的,所述的具有良好分散性能的耐高温超缓凝剂,包括如下重量份组分:有机磷酸或有机磷盐350-400份、分散剂180-280份、表面活性剂20-25 share. [0012] 更进一步优选的,所述的具有良好分散性能的耐高温超缓凝剂包括如下重量...

AI Technical Summary

Problems solved by technology

[0006] 1. The amount of inorganic retarder is large, and with the increase of the amount, it has little effect on the setting time of concrete, but it greatly reduces the strength of concrete;

[0007] 2. The amount of organic retarder is small, and the setting time is long, but the range of the amount is small, and the setting time fluctuates greatly with the change of the amount. When the amount exceeds a certain value, the concrete will have problems such as abnormal condensation and strength decline.

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