Modified sulfamic acid water-reducing agent and method for preparing same
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A technology of sulfamic acid and water reducing agent, applied in the field of building materials, can solve the problems of complicated operation process and high cost, and achieve the effects of reducing cost, low price and improving workability
Inactive Publication Date: 2017-01-04
合肥永佳新材料科技有限公司
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But the cost is high and the operation process is complicated
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Embodiment 1
[0023] 1. Weigh 13.94g of sodium p-aminobenzenesulfonate, 7.37g of phenol and 23.52g of cardanol into a four-necked bottle.
[0024] 2. Weigh 36g of water and add it into a four-necked bottle, raise the temperature to 60°C, stir to dissolve, and adjust the pH value to 9 (using 40% sodium hydroxide solution).
[0025] 3. Continue to heat up to 90° C., slowly add 18.58 g of 37% formaldehyde solution dropwise (the dropping time is controlled within 3 hours), and keep warm for 7 hours after the dropping is completed.
[0026] 4. After the reaction is completed, lower the temperature to 30°C, adjust the pH to about 9, and detect the discharge.
Embodiment 2
[0028] 1. Weigh 13.94g sodium p-aminobenzenesulfonate, 9.25g phenol and 17.52g cardanol into a four-necked bottle.
[0029] 2. Weigh 36g of water and add it into a four-necked bottle, raise the temperature to 60°C, stir to dissolve, and adjust the pH value to 9 (using 40% sodium hydroxide solution).
[0030] 3. Continue to heat up to 90° C., slowly add 18.58 g of 37% formaldehyde solution dropwise (the dropping time is controlled within 3 hours), and keep warm for 7 hours after the dropping is completed.
[0031] 4. After the reaction is completed, lower the temperature to 30°C, adjust the pH to about 9, and detect the discharge.
[0032] When the dosage of products 1 and 2 is 0.5%, the water reducing rate is 20.1% and 20% respectively, and the bleeding rate is 1.4% and 1.6%. And when the dosage of commercially available sulfamic acid water reducer is 0.5%, the water reducing rate is 18.3%, and the bleeding rate is 12.4%. This is due to the introduction of cardanol, which ha...
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Abstract
The invention discloses a method for preparing a modified sulfamic acid water-reducing agent, and the product belongs to the field of building materials. The water-reducing agent is produced through certain process conditions by using sodium sulfanilate, phenol, anacardol, formaldehyde, sodium hydroxide and water. The preparation method has the following advantages that: by using anacardol obtained through extraction of natural cashew nut shell oil to partially replace phenol to preparethe sulfamic acid water-reducing agent, long hydrophobic carbon chains on anacardol molecules can improve the hydrophobicity of water-reducing agent molecules, the water-reducing agent molecules are enabled to have a certain air entraining function, uniform and stable micro-bubbles can be produced in aconcrete mixingprocess and thereby the workability of concrete can be improved; the long hydrophobic carbon chains on theanacardol molecules can also improve steric hindrance and the slump retaining performance of concrete added with the water-reducing agent is increased; as compared with the existing sulfamic acid water-reducing agent, the water-reducing rate is higher, the bleeding performance is lower and the slump retaining performance is better; the cost is lower than phenol and the cost of the sulfamic acid water-reducing agent can be reduced.
Description
technical field [0001] The invention relates to the field of building materials, in particular to a modified sulfamic acid water reducer and a preparation method thereof. Background technique [0002] Water reducer is a kind of concrete admixture, it can increase the workability and slump retention of concrete mixture and improve the workability of concrete mixture without changing the composition of concrete mixing system; or Under the condition that the workability and strength of the concrete mixture remain unchanged, the amount of cement is saved, the cost of concrete is reduced, and the phenomenon of fission, shrinkage and thermal deformation caused by the hydration of cement is reduced. Currently widely used water reducers include modified lignin sulfonate, naphthalene sulfonate formaldehyde condensate, sulfonated melamine formaldehyde condensate, polycarboxylic acid high performance water reducer, etc. Modified lignosulfonate has a low water-reducing rate, which is e...
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