Preparation method of cement dispersant containing polyamide-polyamino constitutional units

A cement dispersant and amide-containing polyamine technology, which is applied in the specific synthesis field of new amphoteric water reducers, can solve the problems of complex reaction process, long reaction cycle, and high energy consumption, and achieve simple operation, good economic benefits, and low reaction time. The effect of temperature

Active Publication Date: 2011-09-21
HUIZHOU JIANKE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problems of long reaction cycle, complicated reaction process and high energy consumption are still not solved
In addition, there are no reports on catalyst selection and key process control in the reaction process.

Method used

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  • Preparation method of cement dispersant containing polyamide-polyamino constitutional units
  • Preparation method of cement dispersant containing polyamide-polyamino constitutional units
  • Preparation method of cement dispersant containing polyamide-polyamino constitutional units

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 103g of diethylenetriamine, 73g of adipic acid, and 2.0g of concentrated sulfuric acid (concentration 98%) into the reactor equipped with stirring, condensation, and reflux water outlet devices at normal temperature, raise the temperature to 90°C, and add 40g of cyclohexane , the temperature was raised to 150° C., and the generated water was removed during the reaction. The constant temperature was reacted for 4 hours, and the water yield was >110%. The cyclohexane was removed by vacuum to obtain adipate polyamide. In the second amidation, add 80g of polyamide adipate to the reactor, and when the temperature reaches 80°C, add 0.32g of hydroquinone as a polymerization inhibitor, react for 10 minutes, then add 11.6g of methacrylic acid, concentrated sulfuric acid (concentration 98%) 0.9g, cyclohexane 30g, heating up to 130°C, removing generated water while reacting, and obtaining amidopolyamine unit after 8 hours. During the radical polymerization process, 6.0 g of th...

Embodiment 2

[0030]Add 146g of triethylenetetramine, 72g of oxalic acid, and 5.0g of sulfamic acid to the reactor equipped with stirring, condensing, and reflux water outlet devices at room temperature, raise the temperature to 80°C, add 50g of benzene, and heat up to 120°C for reaction Remove the generated water at the same time, react at constant temperature for 7 hours, the water yield > 110%, and remove benzene by vacuuming to obtain oxalic acid polyamide. In the second amidation, add oxalic acid polyamide 70g in the reactor, the temperature is up to 90°C, add 0.08g of polymerization inhibitor diphenylamine, react for 15 minutes and then add acrylic acid 13.3g, sulfamic acid 0.83g, 40g of benzene was heated up to 110°C, and the generated water was removed during the reaction, and amide polyamine units were obtained after 3 hours. During the radical polymerization process, 6.3 g of the prepared amide polyamine, 27.2 g of methoxypolyethylene glycol acrylate and 41.7 g of water were added...

Embodiment 3

[0032] Add 189g of tetraethylenepentamine, 152.2g of sebacic acid, and 10g of p-toluenesulfonic acid to the reactor equipped with stirring, condensing, and reflux water outlet devices at room temperature, raise the temperature to 100°C, add 60g of toluene, and raise the temperature to 135°C During the reaction, the generated water was removed, and the reaction was carried out at a constant temperature for 12 hours, and the water yield was >110%, and the toluene was removed by vacuuming to obtain sebacic acid polyamide. In the second amidation, 90g of sebacic acid polyamide was added to the reactor, and the temperature was raised to 100°C, 0.008g of polymerization inhibitor phenothiazine was added, and after 20 minutes of reaction, 15.9g of methacrylic acid and p-toluenesulfonate were added. 1.76 g of acid and 50 g of toluene were heated up to 140°C, and the generated water was removed during the reaction, and amidopolyamine units were obtained after 4 hours. During the radical...

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Abstract

The invention relates to a polycarboxylic acid water reducing agent with excellent property, which is characterized in that polyamide-polyamino constitutional units containing double bonds are introduced into the molecular structure of the polycarboxylic acid water reducing agent to carry out radical copolymerization with (methyl) acrylic acid or methoxy polyethylene glycol (methyl) methacrylate macromonomers to generate a final water-soluble polymer. Because polyamide-polyamino monomers contain cation groups, or (methyl) acrylic acid monomers contain anion groups, the finally synthesized water reducing agent is a polymeric. The polymeric can endow the cement with better flowing property, fluidity maintaining property, cement adaptability and the like, and can obtain better flowing property under lower water cement ratio.

Description

technical field [0001] The invention relates to the technical category of a high-efficiency water reducer for cement concrete, in particular to a specific synthesis method of a novel amphoteric water reducer. Background technique [0002] With the development of my country's economic strength and science and technology in recent years, the international status and people's living standards have been greatly improved. With the subsequent traffic construction, infrastructure construction and the emergence of high-quality buildings, the demand for high-performance concrete in engineering is increasingly strong, which requires new water-reducing agents with good performance and moderate prices. [0003] It is reported in patents CN87104392.0 and CN94115574.0 that since the early 1970s, my country has started research on the synthesis, manufacture and application performance of naphthalene-based high-efficiency water reducers, and has successfully developed UNF-5 and FDN series h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C04B24/28C04B103/40
Inventor 王子明赵樑王亚丽刘晓崔素萍兰明章
Owner HUIZHOU JIANKE IND
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