Method for preparing polycarboxylic acid retarding water reducer
A technology of retarding water reducing agent and polycarboxylic acid, which is applied in the field of preparing water reducing agent, can solve the problems of long reaction time, complicated reaction process, harsh reaction conditions, etc., and achieves economical separation of macromonomers and simple production process. , the effect of reducing the energy consumption of the reaction
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preparation Embodiment 1
[0029] Polyethylene glycol monomethyl ether, acrylic acid, hydroquinone and p-toluenesulfonic acid are esterified at 100°C to 120°C in a reaction kettle to form macromonomer-polyethylene glycol monomethyl ether acrylate, During the reaction process, vacuum and azeotropic separation techniques are used to remove the generated water and recover small molecular monomers, so that unreacted acrylic acid can be recovered and utilized. The molar ratio of polyethylene glycol monomethyl ether to acrylic acid is 1:1.2 , polyethylene glycol monomethyl ether and acrylic acid are the total reactants, the weight of hydroquinone is 1 / 10000 of the total reactant weight, and the weight of p-toluenesulfonic acid is 2 / 100 of the total reactant weight, the described The molecular weight of the macromonomer is 1250.
preparation Embodiment 2
[0031] Polyethylene glycol monomethyl ether, acrylic acid, hydroquinone and p-toluenesulfonic acid are esterified into polyethylene glycol monomethyl ether acrylate at 100 ° C ~ 120 ° C in a reaction kettle, and vacuum is used during the reaction Separation and removal of generated water, and azeotropic separation technology recovery of small molecule monomers, the molar ratio of polyethylene glycol monomethyl ether and acrylic acid is 1: 1.1, polyethylene glycol monomethyl ether and acrylic acid are total reactants, The weight of hydroquinone is 1 / 10000 of the weight of the total reactants, the weight of p-toluenesulfonic acid is 1 / 100 of the weight of the total reactants, and the molecular weight of the polyethylene glycol monomethyl ether acrylate is 1850.
preparation Embodiment 3
[0033] Polyethylene glycol monomethyl ether, acrylic acid, hydroquinone and p-toluenesulfonic acid are esterified into polyethylene glycol monomethyl ether acrylate at 100 ° C ~ 120 ° C in a reaction kettle, and vacuum is used during the reaction Separation and removal of generated water, and azeotropic separation technology to reclaim small molecular monomers, the molar ratio of polyethylene glycol monomethyl ether to acrylic acid is 1: 1.5, polyethylene glycol monomethyl ether and acrylic acid are total reactants, The weight of hydroquinone is 2 / 10000 of the weight of the total reactants, the weight of p-toluenesulfonic acid is 1 / 100 of the weight of the total reactants, and the molecular weight of the polyethylene glycol monomethyl ether acrylate is 3000.
[0034] 2. Polymerization reaction of polycarboxylate water reducer
[0035] Polymerization Example 1 of Polycarboxylate Water Reducer
[0036] Prepare an aqueous solution in a stirring tank with a mass concentration of ...
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