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Modified naphthalene-series water reducer and preparation method thereof

A high-efficiency water reducer and naphthalene-based technology, which is applied in the field of naphthalene-based water reducers, can solve problems such as reduced cement compatibility, weakened water reducer dispersion performance, and complex production processes, so as to improve production efficiency and reduce sodium sulfate. content, the effect of improving workability

Inactive Publication Date: 2014-07-30
FUQING YONGCHUN CONCRETE ADMIXTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The initial raw material of naphthalene-based water reducers is generally industrial naphthalene, but with the sharp rise in the price of industrial naphthalene, the production cost of naphthalene-based water reducers has increased; there is also the use of washing oil instead of industrial naphthalene to produce water reducers, although the cost is relatively high. Low, but its production process is complicated, and the content of sodium sulfate in the water reducer is high, the presence of too high sodium sulfate will lead to weakened dispersion performance of the water reducer, reduced compatibility of cement, and slump of the concrete mixture Negative effects such as changes in loss

Method used

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  • Modified naphthalene-series water reducer and preparation method thereof
  • Modified naphthalene-series water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A preparation method of modified naphthalene series high-efficiency water reducer, which comprises the following steps:

[0014] 1) Dissolving naphthalene: Add 93 parts of industrial naphthalene and 38 parts of washing oil into the reaction kettle and heat up to 130°C to melt;

[0015] 2) Sulfonation: start stirring when the temperature of the reactor rises to 160°C, and slowly add 175 parts of sulfuric acid within 50 minutes for sulfonation for 3.5 hours until the acidity of sulfonation is 31;

[0016] 3) Hydrolysis: Cool down the reaction kettle to 110°C and add 25 parts of water for hydrolysis. The time is controlled for 30 minutes until the acidity is 29;

[0017] 4) Condensation: When the temperature of the reactor is lowered to 90°C, add 90 parts of formaldehyde dropwise, and stir while adding dropwise. The dropping time is controlled at 1.5 hours, the condensation temperature is controlled at 105°C, and the condensation time is 5.5 hours;

[0018] 5) Neutralizat...

Embodiment 2～4

[0020] Adopt the same preparation method as Example 1, the difference is to use the addition amount of each component different in each step listed in Table 1, reaction time, temperature, acidity instead of the corresponding numerical values ​​adopted in Example 1.

[0021] Table 1

[0022]

[0023] The performance data of the concrete modified with the concrete modified admixture obtained in Examples 1-6 are shown in Table 2. The used concrete before the modification of the measured data in the table is C30 strong ℃ concrete, and its combination The ratio is: cement: sand: gravel: water = 1: 1.18: 2.63: 0.41 (mass ratio):

[0024] Table 2

[0025]

[0026] It can be seen from the data in Table 2 that the performance data of the concrete modified with the concrete modified admixture prepared in Examples 1-6 are better than the national standard, and the concrete has less water consumption, low air content and higher strength.

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Abstract

The invention discloses a modified naphthalene-series water reducer and a preparation method thereof. The water reducer comprises 90-110 parts of industrial naphthalene, 40-60 parts of washing oil, 175-185 parts of sulfuric acid and 90-92 parts of formaldehyde. In the production process of the water reducer, wash oil is creatively added for performing modification on naphthalenesulfonic acid, and the water reducer is prepared through steps of naphthalene dissolving, sulfonation, hydrolysis, condensation, neutralization and the like. According to the modified naphthalene-series water reducer, the cost is reduced, also the collapse-preventing effect of the finished product on concrete is improved, thus the workability, the pumpability and the non-air-entraining property of concrete are improved, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a naphthalene-based water reducer, in particular to a modified naphthalene-based high-efficiency water reducer and a preparation method thereof. Background technique [0002] Naphthalene-based water reducer is currently the most produced and widely used water reducer in my country, accounting for more than 70% of the amount of water reducer. Because of its high water reducing rate, it does not entrain air and has little effect on the setting time. Cement has relatively good adaptability and can be used in combination with various other admixtures, so it is often used to prepare high-fluidity, high-strength, high-performance concrete. The initial raw material of naphthalene-based water reducers is generally industrial naphthalene, but with the sharp rise in the price of industrial naphthalene, the production cost of naphthalene-based water reducers has increased; there is also the use of washing oil instead of industrial naphthal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/22C08G16/02C04B103/30
Inventor 余振春余秀龙林为祥
Owner FUQING YONGCHUN CONCRETE ADMIXTURE
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