Preparation method of high mud-resistant concrete water reducer with graft copolymerized cationic side chains

Abstract

The invention discloses a preparation method of a highly mud resistant water reducing agent with graft copolymerization of a cation side chain for concrete, belonging to the field of water reducing agents. The highly mud resistant water reducing agent material with graft copolymerization of a cation side chain for concrete is synthesized by a method of carrying out cation side chain polymerization reesterification first and then graft copolymerization, i.e. an unsaturated cation quaternary ammonium salt monomer as a reactant carries out free radical polymerization in an oxidation-reduction initiation system composed of high-valence cerium salt and alcohols to obtain a terminal hydroxyl cation side chain, then unsaturated carboxylic acid, the terminal hydroxyl cation side chain and methoxy polyethylene glycol carry out esterification under the effect of a catalyst to produce two macromonomers, and then an unsaturated carboxylic acid monomer, a cation side chain macromonomer and a polyether side chain macromonomer as reactants carry out free radical graft copolymerization under the effects of an initiator and a chain transfer agent to obtain the highly mud resistant water reducing agent with graft copolymerization of the cation side chain for concrete. The process of the preparation method has the advantages of simple steps, high efficiency, immediacy, convenience in regulation and control, energy saving and environment protection, a composite side chain structure is synthesized creatively, and the effects of water reducing, slump loss resistance and inhibition in clay side effects are realized.

Description

technical field

[0001] The invention relates to the technical field of a high mud-resistance water reducer for cement concrete, in particular to a kind of unsaturated cationic quaternary ammonium salt firstly polymerized and then esterified with an unsaturated carboxylic acid to form a side chain macromonomer and then combined with an unsaturated cationic quaternary ammonium salt A specific preparation method for grafting and copolymerizing small saturated carboxylic acid monomers into a high mud-resistant concrete water reducer. Background technique

[0002] The vigorous development of high-performance concrete and concrete chemical admixtures makes objectively higher and higher performance requirements for concrete and its components. At present, researchers are committed to developing chemical admixtures that can significantly improve concrete workability and durability. However, concrete raw materials have an important impact on the application performance of chemical ad...

Examples

Embodiment 1

[0027] First, 26.19g of dimethyl diallyl ammonium chloride and 0.72g of isopropanol were added to the reactor, and then 699.2g of water was added to be mixed with a 4% aqueous solution, and the reactor was filled with nitrogen and deoxygenated repeatedly 4 times for 15 After 10 minutes, seal it, add 6.44g of ammonium cerium sulfate, stir for 25 minutes until it is mixed evenly, continue to heat up to 52°C for polymerization reaction, and react for 10 hours to obtain an aqueous solution of hydroxyl-terminated cation side chains; Mix the aqueous solution with 12.91g of methacrylic acid, then add 36g of polyethylene glycol monomethyl ether (molecular weight = 2000), raise the temperature to 65°C, wait until the polyethylene glycol monomethyl ether (molecular weight = 2000) is in a liquid state, and remove it by vacuuming Water in the system, add 5.4g of phosphoric acid, stir for 18 minutes, add 11.37g of benzene when the temperature rises to 80°C, continue to heat up to 135°C for ...

Embodiment 2

[0029] After storing the 40% concrete water reducer solution obtained in Example 1 at 5° C. for 300 days, its implementation effect was measured.

Embodiment 3

[0031] First, 52.98g of methacryloxyethyl dimethyl butyl ammonium bromide and 1.2g of cyclohexanol were added to the reactor, and then 487.62g of water was added to prepare an aqueous solution with a mass concentration of 10%, and the reactor was filled with nitrogen repeatedly After 20 minutes of deoxygenation for 3 times, seal it, add 2.86g of ammonium cerium sulfate, stir for 23 minutes until it is evenly mixed, continue to heat up to 10°C for polymerization reaction, and react for 14.5 hours to obtain an aqueous solution of hydroxyl-terminated cation side chains; the obtained product Hydroxyl-terminated cation side chain aqueous solution is mixed with 9.3g of methacrylic acid, then 72g of polyethylene glycol monomethyl ether (molecular weight=1200) is added, and the temperature is raised to 70°C, until polyethylene glycol monomethyl ether (molecular weight=1200) is Liquid state, vacuumize to remove moisture in the system, add 5.76g of sulfamic acid, stir for 8 minutes, add ...

technical field

[0001] The invention relates to the technical field of a high mud-resistance water reducer for cement concrete, in particular to a kind of unsaturated cationic quaternary ammonium salt firstly polymerized and then esterified with an unsaturated carboxylic acid to form a side chain macromonomer and then combined with an unsaturated cationic quaternary ammonium salt A specific preparation method for grafting and copolymerizing small saturated carboxylic acid monomers into a high mud-resistant concrete water reducer. Background technique

[0002] The vigorous development of high-performance concrete and concrete chemical admixtures makes objectively higher and higher performance requirements for concrete and its components. At present, researchers are committed to developing chemical admixtures that can significantly improve concrete workability and durability. However, concrete raw materials have an important impact on the application performance of chemical ad...

Examples

Embodiment 1

[0027] First, 26.19g of dimethyl diallyl ammonium chloride and 0.72g of isopropanol were added to the reactor, and then 699.2g of water was added to be mixed with a 4% aqueous solution, and the reactor was filled with nitrogen and deoxygenated repeatedly 4 times for 15 After 10 minutes, seal it, add 6.44g of ammonium cerium sulfate, stir for 25 minutes until it is mixed evenly, continue to heat up to 52°C for polymerization reaction, and react for 10 hours to obtain an aqueous solution of hydroxyl-terminated cation side chains; Mix the aqueous solution with 12.91g of methacrylic acid, then add 36g of polyethylene glycol monomethyl ether (molecular weight = 2000), raise the temperature to 65°C, wait until the polyethylene glycol monomethyl ether (molecular weight = 2000) is in a liquid state, and remove it by vacuuming Water in the system, add 5.4g of phosphoric acid, stir for 18 minutes, add 11.37g of benzene when the temperature rises to 80°C, continue to heat up to 135°C for ...

Embodiment 2

[0029] After storing the 40% concrete water reducer solution obtained in Example 1 at 5° C. for 300 days, its implementation effect was measured.

Embodiment 3

[0031] First, 52.98g of methacryloxyethyl dimethyl butyl ammonium bromide and 1.2g of cyclohexanol were added to the reactor, and then 487.62g of water was added to prepare an aqueous solution with a mass concentration of 10%, and the reactor was filled with nitrogen repeatedly After 20 minutes of deoxygenation for 3 times, seal it, add 2.86g of ammonium cerium sulfate, stir for 23 minutes until it is evenly mixed, continue to heat up to 10°C for polymerization reaction, and react for 14.5 hours to obtain an aqueous solution of hydroxyl-terminated cation side chains; the obtained product Hydroxyl-terminated cation side chain aqueous solution is mixed with 9.3g of methacrylic acid, then 72g of polyethylene glycol monomethyl ether (molecular weight=1200) is added, and the temperature is raised to 70°C, until polyethylene glycol monomethyl ether (molecular weight=1200) is Liquid state, vacuumize to remove moisture in the system, add 5.76g of sulfamic acid, stir for 8 minutes, add ...

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