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A modified aluminate cement retarder and its preparation method and application

A technology of aluminate cement and retarder, which is applied in the field of cement retardation, can solve the problems of the performance of modified aluminate cement and the effect of retarder, so as to improve right-angle thickening performance, control cost, Simple preparation process

Active Publication Date: 2020-09-11
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention aims to solve the defects in the prior art that the properties of the modified aluminate cement are affected, and that the content of various ions affects the effect of the retarder, and proposes a modified aluminate cement slow-release agent and a preparation method thereof. The retarder can make the cement paste have good right-angle thickening performance

Method used

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  • A modified aluminate cement retarder and its preparation method and application
  • A modified aluminate cement retarder and its preparation method and application
  • A modified aluminate cement retarder and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment provides a method for preparing a modified aluminate cement retarder, which specifically includes the following steps:

[0042] X1. Raw material mixing

[0043] Put AMPS, unsaturated carboxylic acid, boric acid and glucose into the reactor according to the mass percentage, add deionized water and stir evenly, the stirring rate is 120r / min, and heat up to 60-75°C, the AMPS, unsaturated carboxylic acid, The ratio of the total mass of boric acid and glucose to the mass of deionized water is 1:1.

[0044] X2. Exhaust air

[0045] Exhaust the air and then pass in an inert gas to remove the air; the inert gas is a stable gas, not an inert gas in a narrow sense, and can be nitrogen or argon.

[0046] X3. Trigger

[0047] Add the initiator into the reaction kettle, and obtain the retarder after reacting for 3-4 hours. The initiator is sodium hydroxide, ammonium persulfate or potassium persulfate.

[0048]In this patent, the boric acid and the carboxyl group...

Embodiment 2～ Embodiment 4

[0050] Prepare the modified aluminate cement retarder according to the ratio shown in the following table: Weigh AMPS, unsaturated hydroxy acid, boric acid and glucose respectively, put the raw materials into the reactor, add deionized water and stir evenly, heat up to The reaction temperature is 60-75°C, the ratio of the total mass of AMPS, unsaturated carboxylic acid, boric acid and glucose to the mass of deionized water is 1:2, and then nitrogen gas is introduced to remove the air, and the initiator sodium hydroxide is added. Ammonium sulfate or potassium persulfate, react for 3 to 4 hours to obtain retarder, and then purified, dried and crushed for later use. As shown in Table 1:

[0051]

[0052] Table 1

[0053] Aluminate cement was prepared, and the setting retarders in Examples 2 to 4 were added respectively, and the properties were compared. As follows:

[0054] According to the component design of Example 4 in the patent 201610984589.2 "A Modified Aluminate Cem...

Embodiment 3

[0071] Both the setting retarder of Example 3 and the setting retarder of Example 4 can also effectively control the setting time of the modified aluminate cement.

[0072] When the content of the retarder in Example 3 changes, the thickening time changes accordingly, showing an effective control state, and the thickening curves all have obvious right-angle thickening phenomenon.

[0073] image 3 It is the comparison chart of thickening time of P2, P6 and P7.

[0074] When mixed with 5% or 10% G-grade high-resistance oil well cement, the thickening time is prolonged and the right-angle characteristic of the thickening curve disappears, but it can still effectively meet the requirements of cementing construction, which shows that the retarder can effectively meet the requirements of the improved oil well cement. It has good ability to resist Portland cement pollution.

[0075] Figure 4 It is a comparison chart of compressive strength values ​​of P0-P8 cured at 60°C for 1 d...

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Abstract

The invention discloses a modified aluminate cement retarder as well as a preparation method and application thereof and belongs to the technical field of cement retarding. The modified aluminate cement retarder comprises AMPS, unsaturated carboxylic acid, boric acid and glucose. The boric acid and the unsaturated carboxylic acid are combined and the boric acid forms a compact calcium borate covering layer by adsorbing calcium ions, so that the hydration reaction process of the cement is blocked and the early strength of cement stones is influenced. The structure of the calcium borate coveringlayer is damaged by doping a large amount of hydroxyl acid, so that cement particles can continuously perform hydration reaction under the damage of the covering layer after a period of time, and theeffect of stopping retarding is achieved. The content of the unsaturated carboxylic acid is high, and the carboxylic group in the retarder can achieve the retarding effect and also can improve the right angle thickening property of cement slurry.

Description

technical field [0001] The invention relates to a modified aluminate cement retarder and its preparation method and application, belonging to the technical field of cement retardation. Background technique [0002] Aluminate cement has the advantages of high early strength, high temperature resistance, wear resistance, and good sulfate erosion resistance. It is used in emergency, emergency repair projects, temporary projects, and for the preparation of heat-resistant concrete. It is used in oil and gas well cementing, seawater Fields such as concrete and waste solidification also have potential for development. However, due to the instability of hydration products, aluminate cement has the defect of strength decline, which limits its application and promotion. [0003] In order to improve the strength and stability of aluminate cement, modified external admixtures are usually added to aluminate cement, among which phosphate is an important modified material. A large number...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C04B28/06C04B103/22
CPCC04B28/06C04B40/0039C04B2103/22C04B24/16C04B24/10C04B22/08C04B24/04C04B22/16C04B18/141C04B14/062
Inventor 古安林曾雪玲张洋勇张凌志
Owner JIAHUA SPECIAL CEMENT
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