Slow-release type polycarboxylate water reducer
A slow-release polycarboxylic acid and water-reducing agent technology, applied in the chemical industry, can solve the problems of affecting construction, affecting the performance and quality of concrete, insufficient anti-adsorption capacity of admixtures, etc. Effect
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Embodiment 1
[0015] A slow-release polycarboxylate water reducer, composed of the following raw materials in parts by weight: 100 parts of methallyl polyoxyethylene ether, 20 parts of methacrylic acid, 8 parts of polyethylene glycol, thioethanol 0.39 parts of acid, 0.38 parts of hydrogen peroxide (30%), 0.12 parts of L-ascorbic acid, 60 parts of chloroform, 0.05 parts of hydroquinone, and 0.04 parts of composite catalyst.
[0016] Its specific production process includes the following steps:
[0017] (1) Put methacrylic acid and polyethylene glycol into the flask in proportion, add chloroform as a solvent, hydroquinone as a polymerization inhibitor, and heat the rest to 120 °C under nitrogen protection and condensing reflux conditions. ℃ and mechanically stirred for 4 hours to stop the reaction;
[0018] (2) After the flask is cooled to room temperature, carry out vacuum distillation to remove the process product and solvent to obtain the esterified macromonomer mixture. Configure liquid...
Embodiment 2
[0022] 1. A slow-release polycarboxylate water reducer, consisting of the following raw materials in parts by weight: 110 parts of methallyl polyoxyethylene ether, 30 parts of methacrylic acid, 10 parts of polyethylene glycol, sulfur 0.425 parts of glycolic acid, 0.42 parts of hydrogen peroxide (30%), 0.14 parts of L-ascorbic acid, 70 parts of chloroform, 0.065 parts of hydroquinone, and 0.06 parts of composite catalyst.
[0023] Its specific production process includes the following steps:
[0024] (1) Put methacrylic acid and polyethylene glycol into the flask in proportion, add chloroform as a solvent, hydroquinone as a polymerization inhibitor, and heat the rest to 120 °C under nitrogen protection and condensing reflux conditions. ℃ and mechanically stirred for 4 hours to stop the reaction;
[0025] (2) After the flask is cooled to room temperature, carry out vacuum distillation to remove the process product and solvent to obtain the esterified macromonomer mixture. Conf...
Embodiment 3
[0029] A slow-release polycarboxylate water reducer, consisting of the following raw materials in parts by weight: 120 parts of methallyl polyoxyethylene ether, 40 parts of methacrylic acid, 12 parts of polyethylene glycol, thioethanol 0.46 parts of acid, 0.46 parts of hydrogen peroxide (30%), 0.16 parts of L-ascorbic acid, 80 parts of chloroform, 0.08 parts of hydroquinone, and 0.08 parts of composite catalyst.
[0030] Its specific production process includes the following steps:
[0031] (1) Put methacrylic acid and polyethylene glycol into the flask in proportion, add chloroform as a solvent, hydroquinone as a polymerization inhibitor, and heat the rest to 120 °C under nitrogen protection and condensing reflux conditions. ℃ and mechanically stirred for 4 hours to stop the reaction;
[0032] (2) After the flask is cooled to room temperature, carry out vacuum distillation to remove the process product and solvent to obtain the esterified macromonomer mixture. Configure liq...
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