Double-side chain polycarboxylate superplasticizer and preparation method thereof

A technology of chain polycarboxylate and water reducer, which is applied in the field of double side chain polycarboxylate water reducer and its preparation, can solve problems such as insufficient water reducing rate, poor adaptability of cement materials, excessive viscosity of high-strength concrete, etc., and achieve Good tolerance, low cost, high water reduction effect

Active Publication Date: 2018-01-26
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention aims at the problems of poor adaptability to cement materials, insufficient water reducing rate and excessive viscosity of high-strength concrete in practical application o

Method used

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  • Double-side chain polycarboxylate superplasticizer and preparation method thereof
  • Double-side chain polycarboxylate superplasticizer and preparation method thereof
  • Double-side chain polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Preparation of prepolymer

[0050] In the reactor equipped with thermometer and stirrer, add allyl chloride 25.5g, HPEG (M w =2000) 2000g, 2-mercaptoethanol 5.08g and AIBN 20.3g, after mixing evenly, raise the temperature to 120°C and react for 6h to prepare the corresponding prepolymer.

[0051] (2) Thiolation

[0052] The temperature of the above system was maintained at 120°C, 19.6 g of sodium hydrosulfide was added, and the reaction was stirred for 6 hours to prepare the corresponding macromolecular chain transfer agent containing mercapto groups.

[0053] (3) Introducing adsorption side chains

[0054] Lower the temperature of the above system to 60°C, add 120g of acrylic acid, 48.1g of sodium allyl sulfonate, 0.85g of potassium persulfate and 2200g of water, stir and react for 3 hours, then add a certain amount of NaOH solution and water to adjust the solid content to 30% , and the pH value is 7.0, the corresponding double side chain polycarboxylate superpl...

Embodiment 2

[0057] (1) Preparation of prepolymer

[0058] In the reactor equipped with thermometer and stirrer, add allyl chloride 19.1g, IPEG (M w =2400) 2400g, 4.84g of 2-mercaptoacetic acid and 21.8g of BPO, after mixing evenly, the temperature was raised to 120°C, and the corresponding prepolymer was prepared after reacting for 6 hours.

[0059] (2) Thiolation

[0060] The temperature of the above system was maintained at 120°C, 15.4 g of sodium hydrosulfide was added, and the reaction was stirred for 8 hours to prepare the corresponding macromolecular chain transfer agent containing mercapto groups.

[0061] (3) Introducing adsorption side chains

[0062] Lower the temperature of the above system to 40°C, add 322.8g of methacrylic acid, 39.5g of sodium methallylsulfonate, 1.08g of VA-044 and 4200g of water, stir and react for 3 hours, then add a certain amount of NaOH solution and water to adjust The corresponding double side chain polycarboxylate water reducer can be prepared whe...

Embodiment 3

[0065] (1) Preparation of prepolymer

[0066] In the reactor equipped with thermometer and stirrer, add allyl chloride 17g, HPEG (M w =2400) 2400g, 5.32g of 3-mercaptopropionic acid and 18.1g of tert-butyl hydroperoxide, after mixing uniformly, the temperature was raised to 110°C, and the corresponding prepolymer was prepared after reacting for 4 hours.

[0067] (2) Thiolation

[0068] The temperature of the above system was maintained at 110°C, 13.7 g of sodium hydrosulfide was added, and the reaction was stirred for 8 hours to prepare the corresponding macromolecular chain transfer agent containing mercapto groups.

[0069] (3) Introducing adsorption side chains

[0070] Lower the temperature of the above system to 80°C, add 160g of acrylic acid, 217.8g of maleic anhydride, 91.6g of sodium styrene sulfonate, 1.88g of ammonium persulfate and 1950g of water, stir and react for 2 hours, then add a certain amount of NaOH solution and water to adjust The corresponding double s...

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Abstract

The invention discloses a double-side chain polycarboxylate superplasticizer and a preparation method thereof. The double-side chain polycarboxylate superplasticizer is prepared by the following steps: generating conventional free radical polymerization by virtue of polyether monomers and (methyl) allyl chloride under the actions of an initiator and a chain transfer agent, so as to obtain a prepolymer; generating nucleophilic substitution by virtue of the prepolymer and sodium hydrosulfide, so as to obtain a macromolecular chain transfer agent with sulfydryl; and finally, carrying out free radical polymerization by virtue of the macromolecular chain transfer agent, a monomer A and a monomer B. The preparation method has the beneficial effects that by producing through a one-pot method, nowaste material is produced, the process is simple, and the large-scale production is promoted; the product has the advantages of low mixing amount, high water-reducing rate, good slump retaining property and the like when being applied to concrete, so that the production cost of the concrete can be greatly saved; the double-side chain polycarboxylate superplasticizer has low sensitivity to the types of cements and good tolerance to sandstone aggregates with high silt content, and the viscosity of high-strength concrete can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of admixtures for concrete in building materials, in particular to a double side chain polycarboxylate water reducer and a preparation method thereof. The viscosity has broad application prospects. Background technique [0002] Concrete admixtures refer to substances added to improve and adjust the performance of concrete, which can regulate the rheological properties of concrete, improve mechanical properties and increase durability. With the development of large-scale and complex modern projects, concrete admixtures have become the fifth important component in modern concrete besides cement, sand, stone and water. Polycarboxylate superplasticizer is the most widely used concrete admixture at present. It has outstanding advantages such as low dosage, high water reducing rate, good slump retention performance, strong molecular structure adjustability, and green and pollution-free production process. The ex...

Claims

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Application Information

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IPC IPC(8): C08F285/00C08F261/06C08F214/14C08F8/34C08F220/06C08F228/02C04B24/16C04B103/30
Inventor 李申桐冉千平舒鑫杨勇刘金芝周栋梁陆加越张建纲
Owner JIANGSU SOBUTE NEW MATERIALS
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