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A kind of formula and preparation method of retarder for magnesite cementitious material

A technology of cementitious materials and retarders, applied in the field of retarders, can solve the problems of deformation and cracking of heat dispersing products, insufficient strength of magnesite products, unfavorable molding operations, etc., achieve excellent retardation effect and strength, and enhance retardation. effect, the effect of slowing down the dissipation of heat

Active Publication Date: 2020-06-05
SHIJIAZHUANG JIANHENG HOUSEHOLD DECORATIONS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the production process of magnesite cementitious material, magnesite slurry has the characteristics of early strength and fast hardening, especially in the environment where the temperature is above 30 ℃, the hardening is too fast, and the hardening of magnesite cementitious material slurry is too fast, there will be the following problems , the first is not conducive to the molding operation, and the second is that the product is deformed and cracked due to excessive hardening and uneven heat dispersion. However, after the current coagulant is added as an external additive for the gelling material, the retarding effect is not good, or the magnesite product Insufficient technical issues

Method used

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  • A kind of formula and preparation method of retarder for magnesite cementitious material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Weigh 25 parts of DMF, 3 parts of polysuccinimide, 2 parts of glacial acetic acid, 0.5 part of sodium citrate, 0.5 part of humic acid, 0.5 part of ferric chloride, 7 parts of zinc 4-hydroxybenzenesulfonate, 0.1 part of sodium hydroxymethyl cellulose, 45 parts of water for later use;

[0022] (2) Mix and stir the polysuccinimide and DMF in step (1) at a temperature of 90°C until the polysuccinimide is completely dissolved, then slowly add the glacial acetic acid in step (1) , after mixing and stirring for 60 minutes, a polysuccinimide solution was obtained;

[0023] (3) Sodium citrate, humic acid, ferric chloride, 4-hydroxybenzenesulfonate zinc and water are mixed in step (1) to obtain a mixture aqueous solution, and the mixed aqueous solution is warmed up to 50° C. Wherein slowly add the hydroxymethyl cellulose sodium that takes by weighing in the step (1), stir 20 minutes, solution becomes uniform viscous liquid;

[0024] (4) Mix the polysuccinimide solution obta...

Embodiment 2

[0026] Weigh 35 parts of DMF, 7 parts of polysuccinimide, 6 parts of glacial acetic acid, 1.2 parts of sodium citrate, 1.2 parts of humic acid, 1.2 parts of ferric chloride, 12 parts of 4-hydroxybenzenesulfonic acid zinc salt, hydroxymethyl 0.5 part of sodium cellulose, 50 parts of water for subsequent use, and other steps are the same as in Example 1.

Embodiment 3

[0028] Weigh 30 parts of DMF, 5 parts of polysuccinimide, 4 parts of glacial acetic acid, 1 part of sodium citrate, 1 part of humic acid, 1 part of ferric chloride, 10 parts of 4-hydroxybenzenesulfonic acid zinc salt, hydroxymethyl 0.2 part of sodium cellulose, 48.8 parts of water for subsequent use, and other steps are the same as in Example 1.

[0029] The experimental data of the retarding effect of embodiment one, embodiment two and embodiment three and intensity are as shown in table 1:

[0030] Table 1 embodiment one, embodiment two and embodiment three experimental data

[0031]

[0032] It can be seen from the data in Table 1 that the retarders of Example 1, Example 2 and Example 3 all have good retarding effects when applied to Lingmei gel materials, and also have excellent strength properties, among which The setting retarding effect and strength performance of embodiment three are the best.

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Abstract

The invention belongs to the technical field of retarders, and provides a formula of a retarder for a magnesite cement material. The formula comprises, by weight, 25-35 parts of N,N-dimethyl formamide, 3-7 parts of polysuccinimide, 2-6 parts of glacial acetic acid, 0.5-1.2 parts of sodium citrate, 0.5-1.2 parts of humic acid, 0.5-1.2 parts of iron chloride, 7-12 parts of zinc 4-hydroxybenzenesulfonate, 0.1-0.5 part of carboxymethylcellulose sodium and 45-50 parts of water. The technical problem of poor retarding effect or poor strength of magnesite products after the addition of existing retarder as an external additive for cement materials is solved.

Description

technical field [0001] The invention belongs to the technical field of retarders, and relates to a formula and a preparation method of retarders for magnesite cementitious materials. Background technique [0002] In the production process of magnesite cementitious material, magnesite slurry has the characteristics of early strength and fast hardening, especially in the environment where the temperature is above 30 ℃, the hardening is too fast, and the hardening of magnesite cementitious material slurry is too fast, there will be the following problems , the first is not conducive to the molding operation, and the second is that the product is deformed and cracked due to excessive hardening and uneven heat dispersion. However, after the current coagulant is added as an external additive for the gelling material, the retarding effect is not good, or the magnesite product Insufficient technical problems. Contents of the invention [0003] The invention proposes a formula and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B103/22
CPCC04B40/0039C04B2103/22C04B24/124C04B24/121C04B24/04C04B24/06C04B24/24C04B22/12C04B24/20C04B24/383
Inventor 不公告发明人
Owner SHIJIAZHUANG JIANHENG HOUSEHOLD DECORATIONS CO LTD
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