Lignin sulfonate modified aminosulfonic acid series efficient water reducer and preparation method thereof

A technology of lignosulfonate and sulfamic acid is applied in the field of concrete admixtures, which can solve the problems of small slump of concrete, insufficient dispersion of cement particles, and sensitivity of dosage, so as to solve the phenomenon of segregation and bleeding, improve the Collapse-preserving effect, the effect of broadening the scope of application

Inactive Publication Date: 2014-08-06
FUQING YONGCHUN CONCRETE ADMIXTURE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing sulfamic acid-based high-efficiency water reducers are more sensitive to the dosage. If the dosage is too small, the cement particles will not be sufficiently dispersed, and the concrete slump will be small. If the dosage is too large, the water retention of the concrete will be poor, and bleeding will easily occur. Water, segregation, and even slurry sticking phenomenon, these problems limit its application in concrete, in view of such problems, there is a need for a technical solution to overcome the above shortcomings of the sulfamic acid-based high-efficiency water reducer, in order to solve the problem of sulfamic acid It is a problem that the dosage of high-efficiency superplasticizer is too sensitive in application

Method used

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  • Lignin sulfonate modified aminosulfonic acid series efficient water reducer and preparation method thereof
  • Lignin sulfonate modified aminosulfonic acid series efficient water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A preparation method of lignosulfonate modified sulfamic acid series high-efficiency water reducer, which comprises the following steps:

[0013] 1) Dissolution: Add 110g of water into the reactor, then add 75g of sodium sulfanilate and 60g of phenol respectively, heat up the reactor to 70°C, turn on the stirrer and stir for 30 minutes;

[0014] 2) Addition: Slowly add 30% sodium hydroxide solution into the reactor to adjust the pH value to 9;

[0015] 3) Polycondensation: After heating the reactor to 90°C, add 80g of formaldehyde dropwise and keep the temperature constant for 5 hours;

[0016] 4) Copolymerization: The temperature of the reactor is raised to 95°C, 30g of lignosulfonate and 10g of acrylic acid are added, and the reaction is continued at a constant temperature of 95°C for 2 hours;

[0017] 5) Cool down to room temperature and replenish 110g of water to obtain a lignosulfonate-modified sulfamic acid-based high-efficiency water reducer.

Embodiment 2～4

[0019] Adopting the same preparation method as Example 1, the difference is that the addition amount, reaction time, reaction temperature, and pH value of each component different in each step listed in Table 1 are used to replace the corresponding numerical values ​​adopted in Example 1 .

[0020] Table 1

[0021]

[0022] The performance data of the concrete after the concrete modification admixture modification that makes with embodiment 1-5 is as shown in table 2:

[0023] Table 2

[0024]

[0025] As can be seen from the data in Table 2, the concrete modified by the concrete modified admixture obtained in Examples 1-5 is consistent with the test standard of the national standard "Concrete Admixture" and the unmodified sulfamic acid series water reducer In comparison, the water reducing rate is high, the bleeding rate is low, the air content is low, the 28d shrinkage ratio is low, and the concrete strength is higher.

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Abstract

The invention discloses a lignin sulfonate modified aminosulfonic acid series efficient water reducer and a preparation method thereof. The water reducer adopts sodium sulfanilate, phenol and formaldehyde as reactants, sodium hydroxide as an additive product, formaldehyde as a condensation polymer, and lignin sulfonate and acrylic acid as multipolymers; the lignin sulfonate modified aminosulfonic acid series efficient water reducer is prepared via a dissolution stage, an addition stage, a condensation polymerization stage, a copolymerization stage and the like. The lignin sulfonate modified aminosulfonic acid series efficient water reducer overcomes the defect that the aminosulfonic acid series efficient water reducer is overly sensitive to mixing amount, improves water retention property and adaptability, lowers the preparation cost of the aminosulfonic acid series efficient water reducer, and widens the application range of the lignin sulfosalt.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a lignosulfonate-modified sulfamic acid-based high-efficiency water reducer and a preparation method thereof. Background technique [0002] my country's cement production and consumption rank first in the world, and the annual demand for high-efficiency water reducers is more than 1 million tons. Sulfamate-based water reducer has the advantages of simple production process, good dispersion of cement particles, high water reducing rate, high strength of concrete, good durability, and small loss of slump over time. At present, it is a promising high-efficiency water reducer in China. However, the existing sulfamic acid-based high-efficiency water reducers are more sensitive to the dosage. If the dosage is too small, the cement particles will not be sufficiently dispersed, and the concrete slump will be small. If the dosage is too large, the water retention of the concrete will b...

Claims

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Application Information

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IPC IPC(8): C08F291/14C08F220/06C08G14/073C04B24/22C04B103/30
Inventor 余振春余秀龙林为祥
Owner FUQING YONGCHUN CONCRETE ADMIXTURE
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