Aliphatic-series high-efficiency water reducing agent and preparation method thereof
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A high-efficiency water reducer and aliphatic technology, applied in the field of aliphatic high-efficiency water reducer and its preparation, can solve the problems of high production cost, achieve the effects of less harmful impurities, improve economic benefits, and increase strength
Pending Publication Date: 2018-12-21
JIANGSU BAIRUIJI NEW MATERIAL
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[0003] According to the above deficiencies, the present invention provides an aliphatic superplasticizer and its preparation method which can solve the problem of high production cost of existing naphthalene-based superplasticizers and melamine-based superplasticizers
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Embodiment 1
[0016] An aliphatic high-efficiency water reducer and a preparation method thereof, the preparation method of the aliphatic high-efficiency water reducer comprises the following steps:
[0017] Put formaldehyde and sodium metabisulfite into a container, carry out sulfonation reaction under condensing and reflux conditions for 30-40 minutes; then put in acetone and keep reflux reaction for 20-40 minutes at 30°C-50°C to obtain prechemical material A;
[0018] Put water and sodium sulfite into another container, stir and dissolve evenly, and obtain material B;
[0019] Add prechemical material A dropwise to material B, and heat up to 75°C-80°C within 20-40 minutes to carry out condensation constant temperature reaction. The dropping time is 2-3 hours in total, and the reaction is ended;
[0020] Add water to dilute, lower the temperature to below 55°C, add acid to neutralize, adjust the pH value to 11-13.5, and add activator.
[0021] Furthermore, the mass component ratio of ace...
Embodiment 2
[0028] An aliphatic high-efficiency water reducer, which is obtained by the aliphatic high-efficiency water reducer described in Example 1 and its preparation method.
[0029] For example, in the pre-heating pot with cooling water, when the tail gas device is started to form a slight negative pressure in the system, 29 parts of formaldehyde is added in parts by mass, and then 3.5 parts of sodium metabisulfite are added, and the reaction is stirred for about 30 minutes to dissolve and reflux; then add 8.5 parts of acetone, controlled at 30°C-40°C for reflux reaction for 30 minutes to form a mixed solution for use. Add 27 parts of water (25 parts of water, 2 parts of recovered water) into the cooling water and the condensation pot with insulation layer, and then add 9 parts of sodium sulfite, and stir evenly to obtain an aqueous solution of sodium sulfite. Slowly add the above mixed solution into the sodium sulfite aqueous solution dropwise, let the material naturally heat up to...
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Abstract
The invention discloses an aliphatic-series high-efficiency water reducing agent and a preparation method thereof. The preparation method comprises the following steps: adding formaldehyde and sodiumpyrosulfite into one container and performing sulfonation reaction for 30 to 40 minutes under the reflux condensation condition; then adding acetone to keep reflux reaction for 20 to 40 minutes under30 DEG C to 50 DEG C to obtain a pre-melted material A; adding water and sodium sulfite into another container, evenly stirring and dissolving and obtaining a material B; dropwise adding the pre-melted material A into the material B, warming to 75 DEG C to 80 DEG C within 20 to 40 minutes of dropwise adding to performing condensation constant-temperature reaction and finishing reaction, wherein dropwise adding time is totally 2 to 3 hours; adding water to dilute, reducing temperature to 55 DEG C or below, adding acid to neutralize, adjusting a PH value to 11 to 13.5 and adding an activating agent. The preparation method has the advantages of no heat source, stable and quick production, large productivity, small investment, reduced material cost, good environmental friendliness and reducedcost; the prepared high-efficiency water reducing agent has excellent performance; furthermore, the prepared high-efficiency water reducing agent has little harmful impurities, and effects to reinforced concrete durability are reduced.
Description
technical field [0001] The invention relates to the technical field of fine chemicals, in particular to an aliphatic high-efficiency water reducer and a preparation method thereof. Background technique [0002] At present, with the advancement of construction science and technology, the development of "high-strength and high-performance concrete technology" (including "ready-mixed concrete application technology", "development and application of superplasticizers" and other projects) has been included in the "Ninth Five-Year Plan" period of the Ministry of Construction. The industry focuses on the promotion and application of ten new technologies, so it is urgent to develop a series of products such as superplasticizer (superplasticizer), retarding superplasticizer and so on. At the end of the 20th century, the most used high-efficiency water-reducer was naphthalene-based high-efficiency water-reducer (aromatic) products. In addition to the shortage and high price of naphtha...
Claims
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