Polycarboxylate water reducer with defoaming function and preparation method of water reducer

Abstract

The invention discloses a polycarboxylate water reducer with a defoaming function and a preparation method of the water reducer. The water reducer is prepared from the following raw materials: polyoxyethylene ether macromonomers, acrylic acid or derivative monomers of acrylic acid, a chain transfer agent, an initiator, defoaming monomers and de-ionized water, wherein the chain transfer agent is selected from thioglycollic acid, thiohydracrylic acid, sodium methallylsulphonate and sodium allysulfonate; the initiator is selected from hydrogen peroxide, ascorbic acid, sodium persulfate and ammonium persulfate; the defoaming monomers are polyoxyethylene-polyoxypropylene block copolymers. The preparation method comprises the following steps of pouring the polyoxyethylene ether macromonomers and the de-ionized water into a three-mouth flask, and adding the chain transfer agent; dissolving the initiator in the de-ionized water to prepare a solution A; dissolving acrylic acid or the derivative monomers of acrylic acid and the defoaming monomers in the de-ionized water to prepare a solution B; dropwise adding the solution A and the solution B by adopting a constant flow pump at the same time, performing insulation reaction, naturally cooling, and adjusting the pH value to obtain the water reducer. The water reducer has a defoaming function while having a high-performance water reducing effect.

Description

technical field

[0001] The invention relates to a concrete admixture, in particular to a polycarboxylate water reducer, belonging to the technical field of building materials, in particular to a polycarboxylate water reducer with defoaming function. The invention also relates to a preparation method of the polycarboxylate water reducer. Background technique

[0002] With the improvement of various requirements for concrete in building construction, it is necessary to provide various functional water reducing agents. During the large-volume construction of hydraulic concrete, polycarboxylic acid itself has a certain air-entraining ability, and it is difficult to control during construction and vibration, resulting in too many air bubbles on the concrete surface, affecting the surface quality, and also affecting durability and corrosion resistance. big impact.

[0003] At present, in the process of concrete construction, especially in the construction of large-volume concret...

Examples

Embodiment 1

[0016] Example 1: The polycarboxylate water reducer with defoaming function is made from the following raw materials in parts by mass (mass ratio): 90 parts of polyoxyethylene ether macromonomer, 8.65 parts of acrylic acid, chain transfer 0.95 parts of agent, 0.53 parts of initiator, 0.9 parts of defoaming monomer, and 150 parts of deionized water. Wherein, the polyoxyethylene ether macromonomer is prenyl polyoxyethylene ether TPEG-3000 or prenyl polyoxyethylene ether TPEG-2400. The polyoxyethylene ether macromonomer can also be TPEG-1200, or HPEG-2400 (methallyl polyoxyethylene ether). Described chain transfer agent is sodium methallyl sulfonate; Described initiator is the combination of two kinds of hydrogen peroxide and ascorbic acid, and in 0.53 parts of initiator, hydrogen peroxide accounts for 0.38 part, and ascorbic acid accounts for 0.15 part; Described disinfectant The foam monomer is a block copolymer of polyoxyethylene-polyoxypropylene, and the block copolymer of p...

Embodiment 2

[0018] Example 2: The polycarboxylate water reducer with defoaming function is made of the following raw materials in parts by mass (mass ratio): 88 parts of polyoxyethylene ether macromers, acrylic acid (or its derivatives monomer) 8 parts, chain transfer agent 1.0 part, initiator 0.45 part, defoaming monomer 0.85 part, deionized water 148 parts. Wherein, the polyoxyethylene ether macromonomer is prenol polyoxyethylene ether TPEG-2400 or isopentenol polyoxyethylene ether TPEG-3000, and the polyoxyethylene ether macromonomer It can also be TPEG-1200, or HPEG-2400 (methallyl polyoxyethylene ether). The chain transfer agent is a combination of mercaptopropionic acid, sodium methallyl sulfonate and sodium allyl sulfonate. In 1.0 part of chain transfer agent, mercaptopropionic acid accounts for 0.15 part, methallyl Sodium sulfonate accounts for 0.30 part, and sodium allyl sulfonate accounts for 0.55 part; Described initiator is the combination of two kinds of ascorbic acid and am...

Embodiment 3

[0020] Example 3: The polycarboxylate water reducer with defoaming function is made from the following raw materials in parts by mass (mass ratio): 95 parts of polyoxyethylene ether macromonomers (or 85 parts or 90 parts ), 8 parts of acrylic acid or its derivative monomer (or 8.5 or 9 parts), 0.9 parts of chain transfer agent (or 0.95 or 1.0 parts), 0.5 parts of initiator (or 0.4 or 0.6 parts), defoaming type 1.0 parts (or 0.8 or 0.9 parts) of monomer, 155 parts of deionized water (or 145 parts or 151 parts). Wherein, the chain transfer agent is one or a combination of mercaptoacetic acid, mercaptopropionic acid, sodium methallylsulfonate, sodium allylsulfonate (the mass ratio of the combination is arbitrary ); the initiator is one or a combination of hydrogen peroxide, ascorbic acid, sodium persulfate, ammonium persulfate (the mass ratio of the combination is arbitrary); the defoaming monomer is poly Block copolymer of oxyethylene-polyoxypropylene. The above-mentioned poly...

technical field

[0001] The invention relates to a concrete admixture, in particular to a polycarboxylate water reducer, belonging to the technical field of building materials, in particular to a polycarboxylate water reducer with defoaming function. The invention also relates to a preparation method of the polycarboxylate water reducer. Background technique

[0002] With the improvement of various requirements for concrete in building construction, it is necessary to provide various functional water reducing agents. During the large-volume construction of hydraulic concrete, polycarboxylic acid itself has a certain air-entraining ability, and it is difficult to control during construction and vibration, resulting in too many air bubbles on the concrete surface, affecting the surface quality, and also affecting durability and corrosion resistance. big impact.

[0003] At present, in the process of concrete construction, especially in the construction of large-volume concret...

Examples

Embodiment 1

[0016] Example 1: The polycarboxylate water reducer with defoaming function is made from the following raw materials in parts by mass (mass ratio): 90 parts of polyoxyethylene ether macromonomer, 8.65 parts of acrylic acid, chain transfer 0.95 parts of agent, 0.53 parts of initiator, 0.9 parts of defoaming monomer, and 150 parts of deionized water. Wherein, the polyoxyethylene ether macromonomer is prenyl polyoxyethylene ether TPEG-3000 or prenyl polyoxyethylene ether TPEG-2400. The polyoxyethylene ether macromonomer can also be TPEG-1200, or HPEG-2400 (methallyl polyoxyethylene ether). Described chain transfer agent is sodium methallyl sulfonate; Described initiator is the combination of two kinds of hydrogen peroxide and ascorbic acid, and in 0.53 parts of initiator, hydrogen peroxide accounts for 0.38 part, and ascorbic acid accounts for 0.15 part; Described disinfectant The foam monomer is a block copolymer of polyoxyethylene-polyoxypropylene, and the block copolymer of p...

Embodiment 2

[0018] Example 2: The polycarboxylate water reducer with defoaming function is made of the following raw materials in parts by mass (mass ratio): 88 parts of polyoxyethylene ether macromers, acrylic acid (or its derivatives monomer) 8 parts, chain transfer agent 1.0 part, initiator 0.45 part, defoaming monomer 0.85 part, deionized water 148 parts. Wherein, the polyoxyethylene ether macromonomer is prenol polyoxyethylene ether TPEG-2400 or isopentenol polyoxyethylene ether TPEG-3000, and the polyoxyethylene ether macromonomer It can also be TPEG-1200, or HPEG-2400 (methallyl polyoxyethylene ether). The chain transfer agent is a combination of mercaptopropionic acid, sodium methallyl sulfonate and sodium allyl sulfonate. In 1.0 part of chain transfer agent, mercaptopropionic acid accounts for 0.15 part, methallyl Sodium sulfonate accounts for 0.30 part, and sodium allyl sulfonate accounts for 0.55 part; Described initiator is the combination of two kinds of ascorbic acid and am...

Embodiment 3

[0020] Example 3: The polycarboxylate water reducer with defoaming function is made from the following raw materials in parts by mass (mass ratio): 95 parts of polyoxyethylene ether macromonomers (or 85 parts or 90 parts ), 8 parts of acrylic acid or its derivative monomer (or 8.5 or 9 parts), 0.9 parts of chain transfer agent (or 0.95 or 1.0 parts), 0.5 parts of initiator (or 0.4 or 0.6 parts), defoaming type 1.0 parts (or 0.8 or 0.9 parts) of monomer, 155 parts of deionized water (or 145 parts or 151 parts). Wherein, the chain transfer agent is one or a combination of mercaptoacetic acid, mercaptopropionic acid, sodium methallylsulfonate, sodium allylsulfonate (the mass ratio of the combination is arbitrary ); the initiator is one or a combination of hydrogen peroxide, ascorbic acid, sodium persulfate, ammonium persulfate (the mass ratio of the combination is arbitrary); the defoaming monomer is poly Block copolymer of oxyethylene-polyoxypropylene. The above-mentioned poly...

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