Early strength type polycarboxylic acid high performance water reducing agent and preparation method thereof

Abstract

The invention provides an early strength type polycarboxylic acid high performance water reducing agent. A dendritic macromolecule copolymerized monomer taking methacrylic acid terminated hexanediamine as a core is introduced, and early strength properties of hyperbranched and amide groups of a dendritic macromolecule are utilized; then an isocrotyl polyoxyethylene ether macromonomer with high molecular weight is introduced and the long-side-chain steric hindrance and early strength functions are utilized; finally, the early strength effect is further enhanced by utilizing an unsaturated acylamino small molecule. The early strength type polycarboxylic acid high performance water reducing agent provided by the invention is the early strength type polycarboxylic acid high performance water reducing agent with obvious early strength effect and excellent comprehensive performance. Meanwhile, the invention provides a preparation method of the early strength type polycarboxylic acid high performance water reducing agent; the method comprises the steps of firstly preparing the dendritic macromolecule copolymerized monomer taking the methacrylic acid terminated hexanediamine as the core and then preparing the early strength type polycarboxylic acid high performance water reducing agent; the preparation method has the advantage of simple steps.

Description

technical field

[0001] The invention belongs to the technical field of concrete admixtures, in particular to an early-strength polycarboxylate high-performance water reducer and a preparation method thereof. Background technique

[0002] With the continuous development and improvement of concrete technology, concrete, as one of the commonly used building materials, has been widely used in more and more fields. At the same time, the performance of concrete has also put forward higher and higher requirements. Excellent workability, easy pumping construction, high strength, high durability and super early strength have attracted more and more attention. Early-strength and super-early-strength concrete have broad market application prospects in the construction and maintenance of highways, bridges, ports, prefabricated components, and prestressed high-strength pipe piles. Early-strength concrete develops rapidly.

[0003] In traditional concrete design, the early strength is u...

Examples

Embodiment 1

[0054] An early-strength polycarboxylate high-performance water reducer, the synthetic raw material contains isobutylene polyoxyethylene ether macromonomer with large molecular weight and dendritic macromolecular comonomer with methacrylic acid-terminated hexamethylenediamine as the core.

[0055] The synthetic raw material also contains unsaturated amide comonomer, unsaturated carboxylic acid comonomer, initiator, reducing agent, chain transfer agent, liquid caustic soda and water.

[0056] The molecular weight of the large molecular weight isobutylene polyoxyethylene ether macromonomer is 4000-6000.

[0057] The hexamethylenediamine end-capped by methacrylic acid is the chemical formula of the dendritic macromolecular comonomer of the core as follows:

[0058]

[0059] In parts by mass, the ratio of synthetic raw materials is,

[0060] Large molecular weight isobutylene polyoxyethylene ether macromonomer: 350-400 parts;

[0061] Dendrimer comonomer with methacrylic acid-c...

Embodiment 2

[0095] A preparation method of an early-strength polycarboxylate high-performance water reducer, comprising the following steps,

[0096] (1) The preparation of hexamethylenediamine end-capped by methacrylic acid as the core dendritic macromolecule comonomer: add 25 parts of methanol A and 8.5 parts of hexamethylenediamine A to the reactor, stir until hexamethylenediamine at 50°C A was completely dissolved, and 36 parts of methyl methacrylate was added dropwise for 0.5 h, and the reaction was carried out at 50°C for 10 h, and the intermediate I was obtained by distillation under reduced pressure.

[0097] Add a solution prepared by adding 38 parts of hexamethylenediamine B and 30 parts of methanol B to intermediate I, react at 90°C for 10 hours, and distill under reduced pressure to obtain intermediate II;

[0098] Add 6 parts of methacrylic acid and 0.2 parts of inhibitor hydroquinone to intermediate II, N 2 Under the atmosphere, stirred at 70°C for 3h, and distilled under r...

Embodiment 3

[0101] A preparation method of an early-strength polycarboxylate high-performance water reducer, comprising the following steps,

[0102] (1) Preparation of hexamethylenediamine as the nucleus of methacrylic acid-terminated dendrimer comonomer: add 20 parts of methanol A and 10 parts of hexamethylenediamine A to the reactor, stir until hexamethylenediamine A was completely dissolved, and 40 parts of methyl methacrylate was added dropwise for 0.5 h, and the reaction was carried out at 55°C for 12 h, and intermediate I was obtained by distillation under reduced pressure.

[0103] Add a solution prepared by adding 40 parts of hexamethylenediamine B and 25 parts of methanol B to intermediate I, react at 100°C for 12 hours, and distill under reduced pressure to obtain intermediate II;

[0104] Add 7 parts of methacrylic acid and 0.3 parts of inhibitor hydroquinone to intermediate II, N 2 Under the atmosphere, stirred at 80°C for 4h, and distilled under reduced pressure to obtain a...

technical field

[0001] The invention belongs to the technical field of concrete admixtures, in particular to an early-strength polycarboxylate high-performance water reducer and a preparation method thereof. Background technique

[0002] With the continuous development and improvement of concrete technology, concrete, as one of the commonly used building materials, has been widely used in more and more fields. At the same time, the performance of concrete has also put forward higher and higher requirements. Excellent workability, easy pumping construction, high strength, high durability and super early strength have attracted more and more attention. Early-strength and super-early-strength concrete have broad market application prospects in the construction and maintenance of highways, bridges, ports, prefabricated components, and prestressed high-strength pipe piles. Early-strength concrete develops rapidly.

[0003] In traditional concrete design, the early strength is u...

Examples

Embodiment 1

[0054] An early-strength polycarboxylate high-performance water reducer, the synthetic raw material contains isobutylene polyoxyethylene ether macromonomer with large molecular weight and dendritic macromolecular comonomer with methacrylic acid-terminated hexamethylenediamine as the core.

[0055] The synthetic raw material also contains unsaturated amide comonomer, unsaturated carboxylic acid comonomer, initiator, reducing agent, chain transfer agent, liquid caustic soda and water.

[0056] The molecular weight of the large molecular weight isobutylene polyoxyethylene ether macromonomer is 4000-6000.

[0057] The hexamethylenediamine end-capped by methacrylic acid is the chemical formula of the dendritic macromolecular comonomer of the core as follows:

[0058]

[0059] In parts by mass, the ratio of synthetic raw materials is,

[0060] Large molecular weight isobutylene polyoxyethylene ether macromonomer: 350-400 parts;

[0061] Dendrimer comonomer with methacrylic acid-c...

Embodiment 2

[0095] A preparation method of an early-strength polycarboxylate high-performance water reducer, comprising the following steps,

[0096] (1) The preparation of hexamethylenediamine end-capped by methacrylic acid as the core dendritic macromolecule comonomer: add 25 parts of methanol A and 8.5 parts of hexamethylenediamine A to the reactor, stir until hexamethylenediamine at 50°C A was completely dissolved, and 36 parts of methyl methacrylate was added dropwise for 0.5 h, and the reaction was carried out at 50°C for 10 h, and the intermediate I was obtained by distillation under reduced pressure.

[0097] Add a solution prepared by adding 38 parts of hexamethylenediamine B and 30 parts of methanol B to intermediate I, react at 90°C for 10 hours, and distill under reduced pressure to obtain intermediate II;

[0098] Add 6 parts of methacrylic acid and 0.2 parts of inhibitor hydroquinone to intermediate II, N 2 Under the atmosphere, stirred at 70°C for 3h, and distilled under r...

Embodiment 3

[0101] A preparation method of an early-strength polycarboxylate high-performance water reducer, comprising the following steps,

[0102] (1) Preparation of hexamethylenediamine as the nucleus of methacrylic acid-terminated dendrimer comonomer: add 20 parts of methanol A and 10 parts of hexamethylenediamine A to the reactor, stir until hexamethylenediamine A was completely dissolved, and 40 parts of methyl methacrylate was added dropwise for 0.5 h, and the reaction was carried out at 55°C for 12 h, and intermediate I was obtained by distillation under reduced pressure.

[0103] Add a solution prepared by adding 40 parts of hexamethylenediamine B and 25 parts of methanol B to intermediate I, react at 100°C for 12 hours, and distill under reduced pressure to obtain intermediate II;

[0104] Add 7 parts of methacrylic acid and 0.3 parts of inhibitor hydroquinone to intermediate II, N 2 Under the atmosphere, stirred at 80°C for 4h, and distilled under reduced pressure to obtain a...

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