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保坍型防冻减水剂的制备及性能研究
作者：刘润霞，杜江，张晓芳，刘岩新，张亚，陶佳
（贵州天威建材科技有限责任公司，贵州 贵阳 550009）
摘要：以HPEG、丙烯酸、中间酯等原料合成保坍型聚羧酸减水剂，用单因素试验选出保坍型聚羧酸减水剂的最优配方：HPEG相对分子质量为2400，酸醚比n（AA）∶n（HPEG）=7.5，引发剂、链转移剂、中间酯P用量分别为HPEG单体质量的0.8%、1.6%、0.4%。将最优配方的保坍型聚羧酸减水剂与丙三醇、乙二醇等进行复配得到最优配比的保坍型防冻减水剂，利用红外吸收光谱对其进行结构表征。结果表明：将10%保坍型减水剂与6%乙二醇、6%丙三醇、2%亚硝酸钠、0.3%引气剂、3%和易性调节剂复配（用水配平至100%）得到最优保坍型防冻减水剂，混凝土初始减水率高、保坍性能好、和易性好、抗冻效果好。
关键词：保坍型防冻减水剂；合成；保坍；防冻
中图分类号：TU528.042+.2 文献标识码：A 文章编号：1001-702X（2023）04-0088-04
Study on preparation and performance of slump-retaining type anti-freezing water reducer
LIU Runxia，DU Jiang，ZHANG Xiaofang，LIU Yanxin，ZHANG Ya，TAO Jia
（Guizhou Tianwei Building Materials Technology Co. Ltd.，Guiyang 550009，China）
Abstract：A slump-retaining type polycarboxylic acid superplasticizer was synthesized from raw materials such as 2-methylpropyl-2-alkenyl polyethylene glycol ether（HPEG），acrylic acid and intermediate ester，etc. The optimal formulation of the slump-retaining type polycarboxylic acid superplasticizer was selected by using a single factor test as follows：the molecular weight of HPEG was 2400，the acid ether ratio n（AA）∶n（HPEG） was 7.5，the amount of initiator，chain transfer agent and intermediate ester P accounted for 0.8%，1.6%，and 0.4% of the mass of HPEG monomer，respectively. The optimally formulated slump-preserving polycarboxylic acid superplasticizer is compounded with glycerol，ethylene glycol，etc. to obtain the slump-preserving type antifreeze superplasticizer with the optimal proportion，and its structure is characterized by infrared absorption spectroscopy. The results show that the optimal anti-freezing water reducer with high initial water reduction rate，good slump-preserving performance，good workability，and excellent anti freezing effect is obtained by mixing 10% slump reducing agent with 6% ethylene glycol，6% glycerol，2% sodium nitrite，0.3% air entraining agent，and 3% workability regulator（balanced with water to 100%）.
Key words：anti-freezing and slump-retaining type water reducer，synthesis，slump retaining，antifreeze