Preparation method of viscosity-reducing mud-resistant polycarboxylic acid water reducing agent
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A technology of polycarboxylic acid and anti-mud type, which is applied in the field of concrete water reducer, which can solve the problems of limited anti-mud and viscosity reduction effects, and achieve the effects of improving construction performance, prolonging slump retention time, and reducing plastic viscosity
Active Publication Date: 2021-09-10
HUZHOU FENGSHENG NEW MATERIAL
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[0003] At present, the development of functional polycarboxylate superplasticizers has become the consensus of researchers in the industry. In recent years, mud-resistant and viscosity-reducing polycarboxylate superplasticizers have attracted a large number of scholars to conduct related research. For example, in CN110563891A, polyether large orders Polymer, unsaturated carboxylic acid, functional monomer, initiator, chain transfer agent and olefin containing ester functional group are reacted under the action of initiator to prepare a water reducing agent with both viscosity reducing and anti-sludge functions. The product has certain anti-sludge effect, but only phosphates are used as functional monomers, and the anti-mud and viscosity-reducing effects are very limited
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Embodiment 1
[0023] The preparation method of the polycarboxylate water reducer provided in this embodiment is:
[0024] S1. Mix 11.4g trifluoroacetic acid and 0.2g p-toluenesulfonic acid evenly, raise the temperature to 52°C, add 10g prenyl alcohol dropwise to the above mixture within 1h in a constant pressure dropping funnel, and keep stirring , reacted at 52°C under reflux for 2 hours, added calcium chloride to dry for 12 hours after the reaction, then added anhydrous magnesium sulfate to dry for 12 hours, and collected the product by distillation to obtain the viscosity-reducing functional monomer Ⅰ.
[0025] S2. Take 120g allyl polyoxyethylene ether, 0.77g benzallyl malonitrile, and 80g water and mix evenly to ensure that allyl polyoxyethylene ether and benzallyl malonitrile are fully dissolved in the water phase, and take 0.12g vitamin C. 0.6g of mercaptopropionic acid and 40g of water were fully dissolved and stirred uniformly as liquid A, and 1.44g of acrylic acid, 1.82g of viscosi...
Embodiment 2
[0028] The preparation method of the polycarboxylate water reducer in this example is basically the same as in Example 1, except that in step S2, the amount of viscosity-reducing functional monomer I is 3.64 g, the amount of acrylic acid is 2.88 g, and the amount of benzyl The amount of malononitrile used is 1.54 g, that is, the molar ratio of allyl polyoxyethylene ether, acrylic acid, viscosity-reducing functional monomer I, and benzallyl dinitrile is 1:0.4:0.2:0.1.
Embodiment 3
[0030] The preparation method of the polycarboxylate superplasticizer in this example is basically the same as that in Example 1, except that in step S2, the amount of the viscosity-reducing functional monomer I is 1.82 g, the amount of acrylic acid is 3.6 g, and the amount of benzyl The amount of malononitrile used is 1.54 g, that is, the molar ratio of allyl polyoxyethylene ether, acrylic acid, viscosity-reducing functional monomer I, and benzallyl dinitrile is 1:0.5:0.1:0.1.
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Abstract
The invention belongs to the field of concrete water reducing agents, and particularly relates to a preparation method of a viscosity-reducing mud-resistant type polycarboxylic acid water reducing agent, which comprises the following steps: uniformly mixing trifluoroacetic acid and a catalyst, adding an enol compound into a mixed solution, carrying out reflux reaction, and after the reaction is completed, distilling and collecting a product to prepare a viscosity-reducing functional monomer I; dissolving a polyether monomer and a benzylidene nitrile compound in water to form a water phase system, dissolving a reducing agent and a chain transfer agent in water to serve as a solution A, and dissolving a carboxyl small monomer and a viscosity-reducing functional monomer I in water to serve as a solution B; and adding an initiator into the water-phase system, then dropwise adding thesolution A and the solution B into the water-phase system, completely reacting at a certain temperature, preserving heat and curing for 2-4 hours, and finally adjusting the pH value to be neutral, thereby obtaining the viscosity-reducing and mud-resistant polycarboxylate superplasticizer. The viscosity-reducingmud-resistant type water reducing agent prepared by the invention can obviously reduce the use dosage of the water reducing agent and prolong the slump retaining time of concrete. The viscosity-reducingmud-resistant type water reducing agent has an excellent viscosity reduction effect, reduces the plastic viscosity of concrete and improves the construction performance of concrete.
Description
technical field [0001] The invention belongs to the field of concrete water reducers, and in particular relates to a preparation method of a viscosity-reducing and mud-resistant polycarboxylate water reducer. Background technique [0002] With the development of the concrete field and the national infrastructure industry, various concrete admixtures are used to improve the performance and physical properties of concrete. The most widely used admixture is the water reducer, and its total consumption accounts for more than 80% of the total admixture. The polycarboxylate superplasticizer (PCE) invented in the early 1980s, as a new type of comb-type superplasticizer, means a milestone in the progress of concrete technology. Although PCE has the advantages of small dosage, high water-reducing rate, and good slump-retaining performance, and its practical application is becoming more and more extensive, there are still some aspects that need to be improved. Among them, PCE has str...
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