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氨基磺酸盐系高效减水剂合成工艺及生成元素
来源:http://www.jnjrh.com 日期:2019-05-20 发布人:admin
我国的水泥产量和用量位居世界首位,高效减水剂年需求量达100 万t以上。氨基磺酸盐系减水剂因其具有消费工艺简单,对水泥粒子的分散性好,减水率高,制得的混凝土强度高、耐久性好、坍落度经时损失小等优点而成为目前国内较有开展出路的高效减水剂,也是目前混凝土化学外加剂开发研讨的热点之一。
China's cement production and consumption rank first in the world, and the annual demand of superplasticizer is more than 1 million tons. Aminosulfonate water reducer has become one of the most promising water reducers in China because of its simple consumption process, good dispersion of cement particles, high water reduction rate, high strength, good durability and low slump loss. It is also one of the hotspots in the research and development of concrete chemical admixtures.
(1)磺酸基
(1) Sulfonic acid group
,—SO3H为强亲水基(特别是中和为—SO3M)具有强的分散和减水作用。因而分子链中含有磺酸基的减水剂,能够进步水泥的活动性,特别是水泥的初始活动性。氨基磺酸盐系高效减水剂就是以磺酸基为主要官能团的高效减水剂。
As a strong hydrophilic group, - SO3H (especially neutralizing - SO3M) has a strong dispersion and water reducing effect. Therefore, water reducer containing sulfonic group in molecular chain can improve the activity of cement, especially the initial activity of cement. Aminosulfonate superplasticizer is a superplasticizer with sulfonic group as its main functional group.
(2)苯环
(2) Benzene ring
在氨基磺酸盐系高效减水剂的分子链中含有苯环等大的具有疏水性的官能团,这些基团可以构成一定的空间位阻效应,起到较好的分散性。
The molecular chain of aminosulfonate superplasticizer contains hydrophobic functional groups such as benzene ring, which can form a certain steric hindrance effect and play a better dispersibility.
氨基磺酸
(3)氨基(—
(3) Amino (-
氨基具有亲水性,可以生成内氢键,保证减水剂分子梳形构造的生成与稳定。
Amino group is hydrophilic and can form internal hydrogen bond to ensure the formation and stability of comb structure of water reducer molecule.
(4)羟基(—
(4) Hydroxyl (-
由于水泥水化后,水泥胶粒外表吸附羟基,羟基在水泥外表可以构成氢键,因而羟基对水泥具有一定的缓凝作用。
Since hydroxyl groups are adsorbed on the surface of cement particles after hydration, hydroxyl groups can form hydrogen bonds on the surface of cement, so hydroxyl groups have a certain retarding effect on cement.
氨基磺酸盐系减水剂的构造及其与
Structure of Aminosulfonate Water Reducing Agent and Its Application
性能的关系
The relationship between performance
氨基磺酸盐高效减水剂是一种单环芳烃型高效减水剂,主要由对氨基苯磺酸、单环芳烃衍生物苯酚类化合物和甲醛在酸性或碱性条件下加热缩合而成。
Aminosulfonate superplasticizer is a kind of monocyclic aromatic hydrocarbon superplasticizer. It is mainly composed of p-Aminobenzene Sulfonic acid, phenolic compounds of monocyclic aromatic hydrocarbon derivatives and formaldehyde which are heated and condensed under acidic or alkaline conditions.
氨基磺酸系高效减水剂的分子构造比拟复杂,并且采用不同的单领会有不同的分子构造,但是普遍认同的氨基磺酸盐系高效减水剂的构造。
The molecular structure of aminosulfonate-based superplasticizers is complex, and different single-understanding methods have different molecular structures. However, the structure of aminosulfonate-based superplasticizers is generally accepted.
工艺
Technology
依据文献报道,目前氨基磺酸盐高效减水的合成工艺主要有以下几个种:
According to the literature reports, there are mainly the following synthetic processes for high-efficiency water reduction of aminosulfonates:
第一种合成工艺是由对氨基苯磺酸钠、苯酚以及甲醛在一定温度和pH下停止加成反响,如:Takahiro Furuhashi等申请的专利中采用对氨基苯磺酸钠、苯酚和甲醛在碱性条件下,停止反响,经过调整pH和反响时间来控制产物的分子量,当调整pH反响时间为1 h,对氨基苯磺酸钠、苯酚和甲醛的比例为:1︰1︰2时,生成物分子量可达1 976,而张师恩等以氢氧化钠作为催化剂,应用对水泥的净浆活动度挑选出合成该减水剂的主要工艺参数为:对氨基苯磺酸钠、苯酚、甲醛的摩尔比为1︰(1.5~1.75)︰3,介质的pH值为9左右,60~80℃下滴加甲醛,缩聚反响温度85~95 ℃,缩聚时间3 h。
The first synthetic process is to stop the addition reaction of sodium p-aminobenzene sulfonate, phenol and formaldehyde at a certain temperature and pH. For example, Takahiro Furuhashi and other patents, sodium p-aminobenzene sulfonate, phenol and formaldehyde are used under alkaline conditions to stop the reaction. The molecular weight of the product is controlled by adjusting the pH and reaction time. When adjusting the pH reaction time is 1 h, p-Aminobenzene Sulfonic Acid is used. When the ratio of sodium, phenol and formaldehyde is 1:1:2, the molecular weight of the product can reach 1 976. Zhang Shien et al. used sodium hydroxide as catalyst, selected the main technological parameters for synthesizing the superplasticizer by using the activity of cement paste as catalyst: the molar ratio of sodium p-aminobenzene sulfonate, phenol and formaldehyde is 1:1.5-1.75:3, the pH value of the medium is about 9, and added formaldehyde at 60-80 C. Aldehyde, reaction temperature of polycondensation is 85-95 C, polycondensation time is 3 h.
该合成工艺能够在在碱或酸的催化作用下停止,所以合成道路能够分为碱性和酸性两种。
The synthesis process can be stopped under the catalysis of alkali or acid, so the synthesis path can be divided into alkaline and acidic.
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