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A high-quality naphthalene-based high-efficiency water reducer with high dispersibility and its preparation method
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A high-efficiency water reducer and high-dispersibility technology, applied in the field of fine chemicals, can solve the problems of high unit consumption and low product quality, and achieve the effect of reducing unit consumption of raw materials, excellent quality, and strong cement dispersion ability
Active Publication Date: 2022-03-04
佛山柯杰科技实业有限公司
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[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a high-quality naphthalene-based superplasticizer with high dispersibility and its preparation method, aiming at solving the problem of low product quality and low The problem of high unit consumption
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Embodiment 1
[0086] 1. Put the sulfonation system in the state of slight negative pressure (100-200mm water column), and start the hot water (90±5℃) circulating condensation system of the sulfonation system;
[0087] 2. While stirring, add 1200kg of molten industrial naphthalene; the water generated during the sulfonation reaction process and a small amount of unreacted sublimated naphthalene are pumped into the dish-type enamel condenser in time and condensed by circulating water at 90±5°C;
[0088] 3. When the temperature rises to 140°C, start to add 1200kg of concentrated sulfuric acid dropwise, and finish adding within about 1 hour, while the temperature rises to 160-165°C evenly;
[0089] 4. Finally, continue to keep warm at 160-165°C for 2-2.5 hours, take a sulfonated sample to detect that the total acidity of sulfonation reaches 30%, and the reaction is over;
[0090] 5. Immediately lower the temperature to 125°C, measure the total acidity of sulfonation of 30% and calculate the tot...
Embodiment 2
[0101] The main process technical conditions, raw material consumption and operation skills are basically the same as in Example 1, and the changes of individual main technical operation indicators are as shown in Table 1.
Embodiment 3
[0103] The main process technical conditions, raw material consumption and operation skills are basically the same as in Example 1, and the changes of individual main technical operation indicators are as shown in Table 1.
[0104] Table 1 embodiment main technical operation index change table
[0105]
[0106] Further, see Table 2 and Table 3 for the test report and comparison of the main performance indicators of the product. Comparative example 1 is a commercially available product, which is prepared by adopting a compression lamination process. The commercially available product in Comparative Example 2 was prepared by using an atmospheric pressure lamination process. The data in Table 2 also includes the comparative test results of comparative example 1 (compression with compression) and comparative example 2 (compression with normal compression) manufacturers' products. The data in Table 3 are all the data in the national standard statutory test reports for the prod...
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Abstract
The invention discloses a high-dispersity high-quality naphthalene-based superplasticizer and a preparation method thereof, which comprise the following steps: (1) sulfonation and hydrolysis reaction process; (2) condensation reaction process; (3) neutralization reaction Process; except maintaining negative pressure operation in sulfonation and hydrolysis reaction, and adopting "three high" (high aldehyde ratio, high temperature feeding and reaction, high formaldehyde reflux) technical measures in normal compression, especially in the condensation reaction, it is difficult to operate The higher condensing agent is added to increase the total acidity of the condensation (32±1%), and the high viscosity reaction is maintained for more than 1 hour by controlling the motor current of the stirrer (the stirrer is 0.5~1 times higher than the initial current), and finally the high viscosity is obtained. High-quality naphthalene-based superplasticizer with condensation degree, long molecular chain and high dispersibility.
Description
technical field [0001] The invention relates to the field of fine chemicals, and mainly relates to a high-quality naphthalene-based high-efficiency water reducer with high dispersibility and a preparation method thereof. Background technique [0002] With the development of building science and technology and the progress of building construction technology, concrete has become the most widely used building material in various countries. Concrete admixture is an indispensable fifth component of concrete, and naphthalene-based superplasticizer is one of the most important concrete admixtures. [0003] Naphthalene-based high-efficiency water reducer is made of naphthalene or naphthalene-based homologues, which are sulfonated with concentrated sulfuric acid, hydrolyzed, formaldehyde condensed, liquid gangue (or part of liquid gangue and part of lime water) neutralized and filtered to become a water-based water-reducing agent products, or superplasticizer products that are conc...
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