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Crosslinking type polyether ester amide water reducing agent and preparation method thereof

A technology of polyether ester amide and polyether amide, which is applied in the field of preparation of water reducing agent technology, can solve the problems of slump loss and no obvious improvement in strength

Pending Publication Date: 2021-09-10
吉林奥克新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tan Junhua studied an early-strength slump-preserving polycarboxylate superplasticizer, which uses methallyl polyoxyethylene ether and N-methylol acrylamide as raw materials, and adds self-made functional superplasticizers containing more carboxyl and hydroxyl groups. Monomer, with both early strength and slump protection, but if it is transported for a long distance, the slump will be significantly lost, and the later strength will not be significantly improved

Method used

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  • Crosslinking type polyether ester amide water reducing agent and preparation method thereof
  • Crosslinking type polyether ester amide water reducing agent and preparation method thereof
  • Crosslinking type polyether ester amide water reducing agent and preparation method thereof

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preparation example Construction

[0025] A cross-linked polyether ester amide water reducer and a preparation method thereof, the steps of the preparation method are:

[0026] S1: The initiator allylamine undergoes a nucleophilic substitution reaction with ethylene oxide or propylene oxide to generate an intermediate;

[0027] S2: After the reaction is completed, continue to add ethylene oxide or propylene oxide to the system, and under the action of a basic catalyst, the intermediate and ethylene oxide or propylene oxide continue to undergo a substitution reaction to obtain an unsaturated Polyetheramide;

[0028] S3: The unsaturated polyether amide prepared in S2, unsaturated amide, and unsaturated carboxylic acid are combined with small molecules under the action of an initiator and a chain transfer agent, and the temperature is 50°C-60°C;

[0029] S4: Add cross-linking agent and emulsifier after the system is cooled to control the degree of cross-linking, finally adjust the pH value to 6-7, add water to di...

Embodiment 1

[0049] In reactor, add 57g allylamine, the NaOH of 1.2g is catalyst, N2 After replacing the reactor, when the temperature was gradually raised to 90°C, 1.5mol propylene oxide and 10mol ethylene oxide were successively introduced into the reactor, the pressure of the reactor was 0.35MPa, and the reaction temperature was 150°C. After the feeding is completed, stop heating when the pressure drop of the kettle is 0.15MPa, keep the temperature of the kettle at 100°C for aging for 30 minutes, and discharge the material after the pressure drop of the kettle reaches zero, and then obtain polyetheramide. The measured weight-average molecular weight is 1039.1, which is recorded as PA-1.

[0050] Take the prepared PA-1 polyether amide 300g and N-isopropylacrylamide 47.5g, emulsifier sodium lauryl sulfate 11.7g, initiator sodium persulfate 3.2g and add in the reactor, add deionized water 240g , Stir at a constant speed and raise the temperature to 50°C. At the same time, start to add 44g ...

Embodiment 2

[0052] Add 57g allylamine in the reactor, the KOH of 2.8g is as catalyst, N 2 After replacing the reactor, when the temperature was gradually raised to 90°C, 2mol propylene oxide and 12mol ethylene oxide were introduced into the reactor successively, the pressure of the reactor was 0.35MPa, and the reaction temperature was 150°C. After the feeding is completed, stop heating when the pressure drop of the kettle is 0.15 MPa, keep the temperature of the kettle at 100°C for aging for 30 minutes, and discharge the material after the pressure drop of the kettle reaches zero, and then obtain polyetheramide. The measured weight-average molecular weight is 1247.3, recorded for PA-2.

[0053] Get 350g of PA-2 polyetheramide and 86g of N-isopropylacrylamide, 13g of sodium laureth sulfate, and 5.9g of initiator potassium persulfate into the reactor, add 240g of deionized water, Stir at a constant speed and raise the temperature to 50°C-60°C. At the same time, start to add 62g of methacry...

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Abstract

The invention discloses a crosslinking type polyether ester amide water reducing agent and a preparation method thereof. According to the polyether ester amide water reducing agent obtained by the method, ester group crosslinking is adopted, when a system is strongly alkaline, part of ester groups are dissociated, a single-chain comb-shaped polycarboxylic acid structure, polyether amide and polyether polyol structure are gradually released, the concrete slump retaining capacity can be better through an amide structure, the water reducing agent has the early strength and slump retaining functions due to the fact that carboxyl and ester groups are monomers with the plasticity retaining function, dissociation is carried out step by step, water reducing agent molecules capable of being adsorbed by cement particles can be released within a long time, the initial flowability of cement can be improved, and the stability is kept for a long time.

Description

technical field [0001] The invention relates to the field of preparation of water reducer technology, in particular to a cross-linked polyether ester amide water reducer and a preparation method. Background technique [0002] For large-scale engineering construction, the production efficiency of prefabricated components is the key to shortening the construction period and saving costs. Using water-reducing agents or water-reducing composite admixtures to improve the strength of concrete, especially the early strength, is not only conducive to energy saving and consumption reduction, but also can speed up Improve the mold turnover rate and improve the production efficiency of prefabricated components. In addition, commercial concrete mixing plants are far away from urban areas, and are usually transported by mixer trucks. High slump protection has become a factor that must be considered. The slump of concrete is in a state of continuous loss during long-distance transportatio...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/54C08F220/06C08F222/14C08F220/04C08G65/26C04B24/26C04B103/30
CPCC08F283/065C08G65/2624C04B40/0046C04B2103/302C08F220/54C08F220/06C08F222/102C08F220/04C04B24/2694C04B2103/0068
Inventor 周玉莹于洪波王贵海
Owner 吉林奥克新材料有限公司
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