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Unsaturated polyether monomer, comb-like branched copolymer cement dispersant prepared by the same, and preparation method thereof

A polyether monomer and unsaturated technology, which is applied in the field of concrete admixtures, can solve the problems of limited slump retention capacity and achieve the effects of enhanced steric hindrance, simple preparation method, and small slump loss

Active Publication Date: 2012-06-20
连云港苏博特新材料有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The superplasticizer has a good initial dispersion ability when the dosage is 0.18% to 0.25% of the cement mass, but the slump retention ability for 30 minutes is limited

Method used

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  • Unsaturated polyether monomer, comb-like branched copolymer cement dispersant prepared by the same, and preparation method thereof
  • Unsaturated polyether monomer, comb-like branched copolymer cement dispersant prepared by the same, and preparation method thereof
  • Unsaturated polyether monomer, comb-like branched copolymer cement dispersant prepared by the same, and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0049] Preparation of unsaturated polyether monomer a

[0050] Preparation of unsaturated polyether monomer a-1:

[0051] Place 73.2g of monoethanolamine in a four-necked flask with a reflux condenser, a thermometer, a nitrogen conduit and a stirrer, continuously pass nitrogen protection into the reaction flask, place the flask in a water bath, then heat up to 60°C, and continue stirring Slowly and continuously add 136.8g of allyl glycidyl ether dropwise to the flask for 6 hours. After the dropwise addition, continue to stir and keep warm for 4 hours, and cool to obtain the intermediate.

[0052] 70 g of the intermediate synthesized above and 0.44 g of sodium metal were placed in a 1 L dry stainless steel autoclave, and the autoclave was sealed. After evacuating the reactor, replace the air in the reactor with nitrogen for three times, and raise the temperature to 130°C under continuous stirring. While raising the temperature, keep the reactor continuously vacuumed for 30 min...

Embodiment 1

[0074] In a 1L glass reactor equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen conduit, add 200 g of distilled water and 460 g of unsaturated polyether monomer a-1. Under the protection of nitrogen, the reactor was stirred to dissolve the macromonomer, and the temperature was raised to 90°C, then 58.6g of acrylic acid, 5.62g of acrylamide and 60g of water were mixed and stirred to form a uniform monomer aqueous solution, which was added dropwise to the reaction In the container, the dropping time is 4h. At the same time, 90 g of an aqueous initiator solution containing 2.45 g of potassium persulfate was added dropwise at a constant speed for 4.5 hours. Continue to keep warm for 4 hours after adding all the solution dropwise, then lower the temperature to 50°C, add 30% aqueous sodium hydroxide solution to neutralize the product to about pH=7, and obtain a transparent liquid with a solid content of 57.3%, and the molecular weight of the copolymer is determ...

Embodiment 2

[0076]In a 1L glass reactor equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen conduit, 210 g of distilled water and 320 g of unsaturated polyether monomer a-2 were added. Under the protection of nitrogen, the reactor was stirred to dissolve the macromonomer, and the temperature was raised to 80°C, and then 22.6g sodium acrylate, 15.6g itaconic acid, 0.89g thioglycolic acid and 100g water were mixed and stirred to form a uniform monomer aqueous solution. It was added dropwise to the reactor at a constant speed, and the dropping time was 4.5h. At the same time, 110 g of an aqueous solution containing 4.66 g of sodium persulfate and 110 g of an aqueous solution containing 0.48 g of sodium bisulfite were added dropwise at a constant speed for 5 hours. Continue to keep warm for 6 hours after adding all the solutions dropwise, then lower the temperature to 50°C, add 20% ammonia solution to neutralize the product to about pH=7, and obtain a transparent liquid w...

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Abstract

The invention relates to an unsaturated polyether monomer, a comb-like branched copolymer cement dispersant prepared by the monomer, and preparation methods of the monomer and the dispersant. The unsaturated polyether monomer has the general formula (I), wherein R1 is H or -CH3; X is a linking group selected from -CH2-, -CH2CH2-, -OCH2CH2-, -OCH2CH2CH2CH2-; AO is ethylene oxide group and / or propene oxide group; l, m and n are all repeating units of AO; and the sum of l, m and n is an natural number of 10 to 50. The dispersant has the following chemical structure (VI), wherein x, y and z represent mole percentages of three structural units in the copolymer, and the sum of x, y and z is 100%. Preferably, x is 10% to 50%, y is 40% to 80% and z is 0% to 30%. The preparation method of the dispersant is simple and does not need organic solvents or complex esterification. The dispersant is advantageous in low dosage, good dispersibility and small slump loss.

Description

technical field [0001] The invention relates to a preparation method of a comb-shaped branched copolymer cement dispersant, a monomer used and the obtained comb-shaped branched copolymer cement dispersant, belonging to the technical field of concrete admixtures. Background technique [0002] In recent years, with the continuous development of comb copolymer cement dispersants, it provides a strong guarantee for the construction of infrastructure such as high-speed railways, bridges, hydropower, urban rail transit and airports, and at the same time promotes the construction of high-strength concrete and high-rise building concrete. Further development. [0003] Comb copolymer cement dispersant is a kind of water-soluble polymer with comb structure, which is prepared by free radical copolymerization of unsaturated acid and unsaturated reactive polyether macromonomer. The unsaturated acids used mainly include unsaturated carboxylic acid (salt) and unsaturated sulfonic acid (sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08F290/06C04B24/26C04B103/40
CPCC04B24/2647C04B2103/408
Inventor 杨勇刘加平冉千平缪昌文周栋梁毛永琳
Owner 连云港苏博特新材料有限公司
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