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Preparation method of retarding and efficient water reducing agent for silicate cement and calcined gypsum

A high-efficiency water reducer and portland cement technology, which is applied in the preparation of retarded high-efficiency water reducers, admixtures for calcined gypsum, and the field of Portland cement. It can solve problems such as unsatisfactory product performance and meet the production process conditions Effects that are easy to control, practical, and easy to promote

Inactive Publication Date: 2012-06-20
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, CN1626470A discloses a high-efficiency retarding superplasticizer for Portland cement, which is prepared by blending FDN superplasticizer, soluble soybean protein, retarder and preservative in an appropriate proportion, although added Soluble soybean protein and sodium lignosulfonate reduce the cost of the product and have good economic benefits, but the product performance is not ideal

Method used

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  • Preparation method of retarding and efficient water reducing agent for silicate cement and calcined gypsum
  • Preparation method of retarding and efficient water reducing agent for silicate cement and calcined gypsum
  • Preparation method of retarding and efficient water reducing agent for silicate cement and calcined gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 70 parts by mass (the unit can be kilogram, the same below) of allyl polyoxyethylene ether-1200, 10 parts by mass of methacrylic acid, 10 parts by mass of maleic anhydride, and 2 parts by mass of ammonium persulfate into the reaction kettle , add 160 parts by mass of distilled water, stir and raise the temperature to 85°C, keep the temperature for 5h, after the reaction is completed, cool down to room temperature, add a pH alkaline regulator, adjust the reaction solution to neutral to obtain the product.

[0023] Gypsum Test:

[0024] The influence of the slow-setting superplasticizer synthesized in Example 1 above on the water consumption and setting time of the standard consistency of calcined gypsum was tested. Calcined gypsum adopts α-type gypsum and β-type gypsum. The gypsum is screened through a 200-mesh sieve and selected for testing according to GB / T17669.4-1999. The amount of superplasticizer (reduced solid content) is 2.0% of the mass of gypsum. The res...

Embodiment 2

[0034] A kind of preparation method of retarding superplasticizer for portland cement and calcined gypsum, comprises the following steps:

[0035] a. Take 60 parts by mass (the unit can be kilogram, the same hereafter) of polyolefin derivatives, 5 parts by mass of maleic anhydride, 10 parts by mass of methacrylic acid, and 2 parts by mass of free radical initiator, and put them into the reactor, and add 140 parts by mass Divide water, stir, and heat up to 60-90°C;

[0036] The polyolefin derivative is one or a mixture of allyl polyoxyethylene ether-1200 and allyl polyoxyethylene ether-2400;

[0037] The free radical initiator is one or a mixture of two or more of ammonium persulfate, potassium persulfate or sodium persulfate;

[0038] b. Keep the temperature at 60-90°C and react for 3 hours. After the reaction is completed and the temperature is lowered to room temperature, use an alkaline pH regulator to adjust the pH of the reaction material to 6-8, and then a light yellow ...

Embodiment 3

[0040] A kind of preparation method of retarding superplasticizer for portland cement and calcined gypsum, comprises the following steps:

[0041] a. Take 70 parts by mass (the unit can be kilogram, the same hereafter) of polyolefin derivatives, 15 parts by mass of maleic anhydride, 20 parts by mass of methacrylic acid, and 10 parts by mass of free radical initiator, and put them into the reactor, and add 220 parts by mass Divide water, stir, and heat up to 60-90°C;

[0042] The polyolefin derivative is one or a mixture of allyl polyoxyethylene ether-1200 and allyl polyoxyethylene ether-2400;

[0043] The free radical initiator is one or a mixture of two or more of ammonium persulfate, potassium persulfate or sodium persulfate;

[0044] b. Keep the temperature at 60-90°C and react for 6 hours. After the reaction is completed, after cooling down to room temperature, use an alkaline pH regulator to adjust the pH of the material after the reaction to 6-8, and then a light yellow...

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Abstract

The invention discloses a preparation method of retarding and efficient water reducing agent for silicate cement and calcined gypsum. The preparation method is characterized by comprising the steps of feeding 60 to 70 mass parts of polyolefine derivative, 5 to 15 mass parts of maleic anhydride, 10 to 20 mass parts of methylacrylic acid and 2 to 10 mass parts of radical initiator into a reaction kettle, adding 140 to 220 mass parts of water into the reaction kettle, stirring, raising the temperature to 60 to 90 DEG C, reacting for 3-6h at 60 to 90 DEG C, reducing the temperature to room temperature after the reaction, then adjusting the pH value of reacted material to 6 to 8 with alkaline pH regulator, and then obtaining yellowish retarding and efficient water reducing agent products, wherein the mass percent of solids in the products is 30-50%. The preparation method has the advantages that the production process and equipment are simple, mass industrial production is easy to realize, the retarding effect on silicate cement and calcined gypsum material is obvious, and the water-reducing rate is high.

Description

technical field [0001] The invention belongs to retarded water reducer, and relates to a preparation method of retarded high-efficiency water reducer for Portland cement and calcined gypsum. It is especially suitable as an admixture for Portland cement and calcined gypsum. Background technique [0002] Since the development of polycarboxylate superplasticizers in the mid-to-late 1990s, polycarboxylate superplasticizers have high water-reducing rates and small slump losses, which can effectively improve the structural density of gelled materials and improve gelation. The constructability of the material and the solution to the air-entraining problem of cementitious materials have attracted much attention from the construction industry at home and abroad. In addition, the polycarboxylate superplasticizer has good stability, environmental protection and high economic benefits. But at present, most of the development and production of polycarboxylate superplasticizers are used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C04B24/26C04B103/22C04B103/30
Inventor 霍冀川周恒雷永林
Owner SOUTHWEAT UNIV OF SCI & TECH
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