Preparation method of cement setting accelerator

A technology of quick-setting agent and cement, applied in the field of preparation of cement quick-setting agent, can solve the problems of poor quick-setting effect of the quick-setting agent and slow solidification speed of cement, and achieve the effect of increasing the absorption rate and enhancing the adsorption effect.

Inactive Publication Date: 2018-11-16
FOSHAN LINGCHAO NEW MATERIAL CO LTD
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AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a preparation method of cement accelerators for the defects that the current accelerators have poor quick-setting effect, which leads to the slow setting speed of cement.

Method used

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Embodiment Construction

[0024]Stir and mix starch and sodium hydroxide solution with a mass fraction of 5-8% at a mass ratio of 1:4. After mixing, let it stand at a constant temperature for 24-26 hours, and then put it into a centrifuge at a centrifugal speed of 2800-3000r / min. Centrifuge 4-8 times under certain conditions, each time for 15-20min, remove the upper impurity, wash 3-5 times with distilled water and dry in an oven with a temperature of 105-110°C for 2-3 hours to obtain the pretreated product; by weight In terms of parts, weigh 15-18 parts of the above-mentioned pretreatment product, 2.5-2.8 parts of β-cyclodextrin and 24-28 parts of distilled water into a beaker, put the beaker into a shaker, and set the Shake for 30 to 40 minutes under the same conditions, put it into a freeze dryer after shaking, crystallize at a temperature of 4 to 8°C for 2 to 3 hours, put it into a pulverizer after crystallization, and crush it through a 150-mesh sieve to obtain modified starch; Put the above-menti...

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Abstract

The invention relates to a preparation method of a cement setting accelerator, and belongs to the technical field of building materials. Starch is modified with beta-cyclodextrin, the beta-cyclodextrin is formed by polymerizing seven molecules of D-glucopyranose, and has a cone-like pore cavity, straws are modified with maleic anhydride to introduce a double bond and a carboxylic acid group to themolecular chain of the straws, the modified straws are mixed with water absorbent resin containing a carboxyl group, a hydroxyl group, an amido group a sulfonic acid group, the maleic anhydride-modified straws are mixed with diatomite, the diatomite has an orderly micro-porous structure with a large porosity, micro-pores have large sizes and can adsorb a large amount of the modified straw particles, and the modified straw particles contain the carboxyl group introduced by the maleic anhydride in order to avoid the agglomeration phenomenon of organic molecules and increase the contact area between the molecules and the outside, so moisture in the cement can be sufficiently and efficiently absorbed, the quick-setting effect is enhanced, and the cement setting accelerator has a broad application prospect.

Description

technical field [0001] The invention relates to a preparation method of a cement quick-setting agent, which belongs to the technical field of building material preparation. Background technique [0002] Accelerator is an admixture mixed into concrete that can make concrete harden quickly. Powdery solids, whose dosage only accounts for 2% to 3% of the amount of cement in concrete, can make concrete set in 5 minutes and finally set in 10 minutes. The strength can be produced in 1 hour, and the strength can be increased by 2 to 3 times in 1 day, but the strength will decrease in the later stage. The mechanism of quick setting and early strength of the accelerator is to make the gypsum in the cement into Na 2 SO 4 , Lose the retarding effect, thereby promoting the rapid hydration of C3A, and the crystals of its hydration products are precipitated in the solution, resulting in the rapid solidification of cement slurry. In order to achieve the purpose of emergency repair or ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C08B31/00C08H7/00C08F289/00C08F251/00C08F220/06C08F220/56C04B103/12
CPCC04B40/0039C08B31/00C08F251/00C08F289/00C08H6/00C04B2103/12C08F220/06C08F220/56C04B24/38C04B22/06C04B24/2688
Inventor 裘友玖蒋梦成朱彩娣
Owner FOSHAN LINGCHAO NEW MATERIAL CO LTD
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