Vinyl-terminated hyperbranched polymer, viscosity-reducing type polycarboxylic acid water reducing agent with hyperbranched structure and preparation methods of vinyl-terminated hyperbranched polymer and viscosity-reducing type polycarboxylic acid water reducing agent

A technology of hyperbranched polymer and vinyl end capping is applied in the field of hyperbranched polymer and concrete admixture, which can solve the problems of high viscosity of concrete and large amount of water reducing agent.

Active Publication Date: 2021-09-10
CHINA WEST CONSTR ACAD OF BUILDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies, the purpose of the present invention is to provide a vinyl-terminated hyperbranched polymer, a viscosity-reducing polycarboxylate water-reducer with a hyperbranched structure and a preparation method thereof, which can effectively solve the problems in the prior art. Existing problems of large amount of water reducer and high viscosity of concrete

Method used

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  • Vinyl-terminated hyperbranched polymer, viscosity-reducing type polycarboxylic acid water reducing agent with hyperbranched structure and preparation methods of vinyl-terminated hyperbranched polymer and viscosity-reducing type polycarboxylic acid water reducing agent
  • Vinyl-terminated hyperbranched polymer, viscosity-reducing type polycarboxylic acid water reducing agent with hyperbranched structure and preparation methods of vinyl-terminated hyperbranched polymer and viscosity-reducing type polycarboxylic acid water reducing agent
  • Vinyl-terminated hyperbranched polymer, viscosity-reducing type polycarboxylic acid water reducing agent with hyperbranched structure and preparation methods of vinyl-terminated hyperbranched polymer and viscosity-reducing type polycarboxylic acid water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This example provides a preparation method of a viscosity-reducing polycarboxylate water reducer with a hyperbranched structure, including the following raw materials in mass percentages: 10% unsaturated carboxylic acid, 1.3% unsaturated anhydride, 86.7% unsaturated polyether, 0.4% of unsaturated phosphate ester, 1% of hyperbranched functional monomer, 0.2% of initiator, 0.4% of chain transfer agent, the total is 100%. Specific steps are as follows:

[0056] S1, preparation of vinyl-terminated hyperbranched polymer-functional monomer:

[0057] S1.1, after adding the monomer containing primary amino groups (specifically melamine, 0.5mol), the catalyst (specifically triethylbenzyl ammonium chloride) and the aprotic polar solvent (specifically toluene) into the reactor , heat up to 90°C, add epichlorohydrin dissolved in ethanol dropwise within 1 hour, keep warm for 3 hours after dropwise addition, cool down to room temperature and add solid alkali in four batches in equal...

Embodiment 2

[0069] This example provides a preparation method of a viscosity-reducing polycarboxylate superplasticizer with a hyperbranched structure, including the following raw materials in mass percentages: 7% of unsaturated carboxylic acid, 1% of unsaturated anhydride, 88.5% of unsaturated polyether, 0.5% of unsaturated phosphoric acid ester, 2% of hyperbranched functional monomer, 0.4% of initiator, and 0.6% of chain transfer agent are 100% in total. Specific steps are as follows:

[0070] S1: take by weighing 310g molecular weight 2400 isopentenol polyoxyethylene ether, 3.5g maleic anhydride, 7.0g vinyl-terminated hyperbranched functional monomer (made by S1 in embodiment 1) and 300g deionized water and join in In the reactor, stir and dissolve to obtain the bottom material;

[0071] S2: Take by weighing 21.5g acrylic acid, 3g methacrylic acid, 1.75g ​​methacrylate-2-hydroxyethyl phosphate and 2.1g chain transfer agent mercaptoethanol, dissolve in 30g water to obtain solution A; we...

Embodiment 3

[0076] This example provides a preparation method of a viscosity-reducing polycarboxylate water reducer with a hyperbranched structure, including the following raw materials in mass percentages: 6.0% of unsaturated carboxylic acid, 1.3% of unsaturated anhydride, 89.3% of unsaturated polyether, 0.6% of unsaturated phosphoric acid ester, 1.4% of hyperbranched functional monomer, 0.6% of initiator, and 0.8% of chain transfer agent are 100% in total. Specific steps are as follows:

[0077] S1: Weigh methallyl alcohol polyoxyethylene ether of 313g molecular weight 2400, 4.55g maleic anhydride, 4.9 g vinyl-terminated hyperbranched functional monomer (made by S1 in embodiment 1) and 300g deionized water and add into the reactor, stirring and dissolving to obtain the bottom material;

[0078] S2: Take 21g acrylic acid, 2.1g methacrylic acid-2-hydroxyethyl phosphate and 2.8g chain transfer agent mercaptoethanol, dissolve in 30g water to obtain solution A; weigh 1.6g ammonium persulfat...

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Abstract

The invention discloses a vinyl-terminated hyperbranched polymer, a viscosity-reducing type polycarboxylate water reducing agent with a hyperbranched structure and preparation methods of the vinyl-terminated hyperbranched polymer and the viscosity-reducing type polycarboxylate water reducing agent, and belongs to the technical field of concrete admixtures. The viscosity-reducing type polycarboxylate water reducing agent with the hyperbranched structure is composed of the following raw materials in percentage by mass: 3 to 18 percent of unsaturated carboxylic acid, 1 to 10 percent of unsaturated anhydride, 0 to 1 percent of unsaturated phosphate, 75 to 93 percent of unsaturated polyether, 1 to 6 percent of a hyperbranched functional monomer, 0.1 to 1 percent of an initiator and 0.2 to 3.0 percent of a chain transfer agent. The prepared water reducing agent has the characteristics of special branched topological molecular structure, low intrinsic viscosity and the like, effectively weakens the intermolecular chain winding effect of the polycarboxylic acid water reducing agent, improves the dispersing performance of the water reducing agent, and reduces the dosage of the water reducing agent; and the thickness of an adsorption layer on the surface of a cementing material particle is increased, the thickness of a solvation layer on the surface of the particle is reduced, free water is released, and the viscosity of the high-strength concrete is reduced.

Description

technical field [0001] The invention relates to the technical field of hyperbranched polymers and concrete admixtures, in particular to a vinyl-terminated hyperbranched polymer, a viscosity-reducing polycarboxylate water reducer with a hyperbranched structure and a preparation method thereof. Background technique [0002] With the continuous expansion of the scale of civil engineering in my country and the continuous improvement of the level of science and technology, some important buildings with special functional requirements such as super high, long span, high specific strength and high load continue to appear, such as skyscrapers, super large super span bridges and huge water conservancy projects Construction, etc. require concrete to have high strength. Improving the strength of concrete is mainly achieved by increasing the cementitious material and reducing the water-binder ratio, but the viscosity of low-water-binder ratio concrete is high and the flow rate is slow, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/333C04B24/26C08F283/06C08F222/06C08F230/02C08F216/14C04B103/30
CPCC08G65/33396C08F283/065C04B24/2694C04B2103/302C08F222/06C08F220/06C08F230/02C08F216/1458Y02W30/91
Inventor 高育欣王福涛刘明杨文曾超张磊叶子闫松龄
Owner CHINA WEST CONSTR ACAD OF BUILDING MATERIALS CO LTD
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