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Collapse protective poly-carboxylic acid water reducing agent and preparation method thereof
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A technology of water reducer and polycarboxylic acid, which is applied in the field of new polycarboxylate water reducer and its synthesis. The effects of short cycle, good water reducing rate and slump retention performance, and easy control of reaction conditions
Active Publication Date: 2012-07-25
浙江五龙新材股份有限公司
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Problems solved by technology
This method needs to be esterified first and then polymerized, and the process is complicated. Along with the rise of (meth)acrylic acid price, the cost continues to increase, and the molecular weight distribution and purity of raw materials will affect the performance of the product; 2, directly by allyl polyethylene glycol Prepared by copolymerization with unsaturated carboxylic acid monomer in aqueous solution or solvent, the water reducing agent synthesized by this method has low water reducing rate and poor slump retention performance
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Embodiment 1
[0030] 1. The composition and ratio of the monomers used are as follows:
[0031] 1) Monomer A: maleic anhydride (MAD), accounting for 30% of the total monomer weight;
[0032] 2) Monomer B: allyl polyethylene glycol (APEG), with a molecular weight of 2400, accounting for 60% of the total monomer weight;
[0033] 3) Monomer C: dimethylaminoethyl methacrylate, accounting for 10% of the total monomer weight.
[0034] Two, the preparation process is as follows:
[0035] 1) 30g maleic anhydride and 60g allyl polyethylene glycol are dropped into the reaction flask, and 65g deionized water is added to dissolve it;
[0036] 2) Under the protection of nitrogen, the temperature was raised to 90°C while stirring, and 40 g of dimethylaminoethyl methacrylate solution with a concentration of 30% and 30 g of ammoniumpersulfate solution with a concentration of 5% were added dropwise, and the addition was completed in 3 hours;
[0037] 3) After the dropwise addition, keep the reaction for...
Embodiment 2
[0039] 1. The composition and ratio of the monomers used are as follows:
[0040] 1) Monomer A: maleic anhydride (MAD), accounting for 20% of the total monomer weight;
[0041] 2) Monomer B: allyl polyethylene glycol (APEG), with a molecular weight of 2400, accounting for 50% of the total monomer weight;
[0042] 3) Monomer C: dimethylaminoethyl methacrylate, accounting for 30% of the total monomer weight.
[0043] Two, the preparation process is as described in Example 1.
Embodiment 3
[0045] 1. The composition and ratio of the monomers used are as follows:
[0046] 1) Monomer A: maleic anhydride (MAD), accounting for 40% of the total monomer weight;
[0047] 2) Monomer B: allyl polyethylene glycol (APEG), with a molecular weight of 2400, accounting for 30% of the total monomer weight;
[0048] 3) Monomer C: dimethylaminoethyl methacrylate, accounting for 30% of the total monomer weight.
[0049] Two, the preparation process is as described in Example 1.
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Abstract
The invention discloses a collapse protective poly-carboxylic acid water reducing agent and a preparation method thereof, in particular to a novel poly-carboxylic acid water reducing agent prepared by taking dimethylamino ethyl methacrylate, allyl polyethylene glycol and maleic anhydride as raw materials and a synthetic method thereof. The collapse protective poly-carboxylic acid water reducing agent is prepared by polymerizing 5-60 percent of dimethylamino ethyl methacrylate, 15-60 percent of maleic anhydride and 15-70 percent of allyl polyethylene glycol as the raw materials with a water solution under the action of an initiating agent. The invention also discloses the preparation method of the collapse protective poly-carboxylic acid water reducing agent. The invention has the advantages that: 1. a polymer has high water reducing rate and favorable collapse performance; 2. the preparation process adopts one step method, has easy control reaction conditions, no pollution, short reaction period and simple operation, and carries out the polymerization in the water solution; and 3. the invention has mild reaction conditions and low requirement on the equipment.
Description
technical field [0001] The invention is a slump-preserving polycarboxylate water reducer and its preparation method, in particular to a new type of polycarboxylate with dimethylaminoethyl methacrylate, allyl polyethylene glycol and maleic anhydride as raw materials Acid-based water reducer and its synthesis method. Background technique [0002] In recent years, polycarboxylate water reducers have been widely used in the concrete industry. The main reason is that this type of water reducer can endow concrete with high dispersion, fluidity and high dispersion system stability at low dosages to prevent slumping loss. At the same time, the rising price of industrial naphthalene, the long production cycle of naphthalene-based water-reducers, serious environmental pollution, and serious slump loss have become increasingly prominent, making the research and application of polycarboxylate water-reducers imperative. [0003] The common method for preparing polycarboxylate water red...
Claims
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