Preparation method of air-entraining ester polycarboxylate superplasticizer

A technology of ester polycarboxylic acid and water reducer, which is applied in the field of construction admixtures, can solve the problems of increased chemical erosion resistance of concrete, poor concrete workability, and reduced concrete strength, and achieves increased system space and steric effects, Good air-entraining and foam-stabilizing properties, and the effect of reducing surface tension

CN112608420AActive Publication Date: 2021-04-06KZJ NEW MATERIALS GROUP CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-04-06

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Abstract

The invention discloses a preparation method of an air-entraining ester polycarboxylate superplasticizer. The preparation method comprises the following steps: (1) preparing an esterification product; (2) copolymerization reaction; and (3) neutralization reaction. According to the preparation method, the esterification product is prepared by esterification of coco fatty acid diethanolamide and unsaturated acid, the preparation method has the advantages of low cost and simplicity and convenience in operation, and the prepared esterification product participates in the next copolymerization reaction, so that a main chain of the polycarboxylate superplasticizer has hydrophilic groups such as amide and the like; the prepared polycarboxylate superplasticizer has good air entraining and foam stabilizing properties, and the workability and the strength of concrete are improved.
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Description

technical field

[0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of an air-entraining ester polycarboxylate water reducer. Background technique

[0002] With the construction of the country's large-scale infrastructure, nuclear power, water conservancy, bridges and various large-scale projects, the performance requirements of concrete are constantly improving, especially some major projects have strict requirements on the strength, durability and workability of concrete. High demands were made.

[0003] Although the excellent water-reducing performance of polycarboxylate superplasticizers has been widely recognized by the industry, at present, due to the poor air-entraining effect of polycarboxylate superplasticizers, they are often used in concrete because of their high viscosity and low air-entrainment, which often lead to the easy mixing of concrete. The performance is poor, and there is a probl...

Examples

Embodiment 1

[0039] (1) Preparation of esterification product: In parts by weight, 30 parts of acrylic acid and 100 parts of coconut acid diethanolamide are added to the first reaction vessel for mixing, and under nitrogen conditions, 0.65 parts of cerium sulfate and 2.6 parts of 4-hydroxyl Piperidinol oxygen free radical, and adjust the temperature to 80°C, react for 6h, and obtain the esterification product of monomer with amide, dihydroxyl group and unsaturated acid;

[0040](2) Copolymerization reaction: by weight, earlier the esterification product that 1 part of step (1) makes, 100 parts of polypropylene glycol di(meth)acrylates of molecular weight 2400, 0.3 part of dodecylbenzenesulfonic acid Sodium, 0.6 parts of diethylene glycol monolaurate and 114 parts of water are added to the second reaction vessel and stirred evenly, 1.8 parts of ammonium persulfate and 20 parts of water are mixed evenly in the first dropping device; 2 parts of hydrogen sulfite Sodium, 1 part of thioglycolic ...

Embodiment 2

[0043] (1) Preparation of esterification product: by weight, 61.5 parts of maleic anhydride and 100 parts of cocoic acid diethanolamide were added to the first reaction vessel for mixing, and under nitrogen conditions, 2.42 parts of antimony trioxide, 0.48 Parts of 4-tert-butylcatechol, and adjust the temperature to 90 ° C, react for 5 hours, that is, the esterification product of a monomer with an amide and a double hydroxyl group and an unsaturated acid;

[0044] (2) Copolymerization reaction: by weight, first the esterification product that 2.5 parts of steps (1) make, 100 parts of polyethylene glycol polypropylene glycol di(meth)acrylates of molecular weight 3000, 0.6 part of dodecane Sodium phenylsulfonate, 1.2 parts of diethylene glycol monolaurate and 114 parts of water are added to the second reaction vessel and stirred evenly, and 2 parts of hydrogen peroxide and 20 parts of water are mixed evenly in the first dropping device; 3 times Sodium phosphate, 1.5 parts of me...

Embodiment 3

[0047] (1) Preparation of esterification products: in parts by weight, 60 parts of fumaric acid and 100 parts of cocoic acid diethanolamide are added to the first reaction vessel for mixing, and under nitrogen conditions, 5.6 parts of p-toluenesulfonic acid, 1.3 parts of p-toluenesulfonic acid and 1.3 parts of Parts of methyl hydroquinone, and adjust the temperature to 110 ° C, react for 4 hours, that is, the esterification product of monomers with amide and dihydroxyl groups and unsaturated acids is obtained;

[0048] (2) Copolymerization reaction: in parts by weight, first 3.5 parts of the esterification product obtained in step (1), 100 parts of polytetramethylene glycol monomethacrylate with a molecular weight of 3000, and 0.45 parts of dodecylbenzenesulfonic acid Sodium, 0.9 parts of diethylene glycol monolaurate and 116 parts of water are added to the second reaction vessel and stirred evenly, and 2 parts of hydrogen peroxide and 20 parts of water are mixed evenly in the ...