Preparation method of slump retaining agent capable of releasing controllable polycarboxylic acid

Abstract

The invention discloses a preparation method of a slump retaining agent capable of releasing controllable polycarboxylic acid and relates to the technical field of chemical additives for building materials. The preparation method includes the following steps that 1, 144-180 parts of unsaturated polyoxyethylene ether monomer and 144-180 parts of deionized water are added, by mass, to a three-mouth flask, stirring is performed till dissolution is completed, heating is performed to reach 45-60 DEG C during stirring, and heat preservation is performed; 2, 1.0-2.0 parts of a chain transfer agent and 0.5-1.5 parts of an initiator are dissolved, by mass, in 30-60 parts of deionized water to prepare a solution A; 3, 2-20 parts of unsaturated acid and 20-30 parts of unsaturated ester are dissolved, by mass, in 10-20 parts of deionized water to prepare a solution B; 4, after the step 1 is completed, the solution A and the solution B are simultaneously dropwise added to the three-mouth flask, the adding times are respectively 180-210 minutes and 150-180 minutes, reaction continues for 60-80 minutes, deionized water is added, dilution is performed till the theoretical solid content of 40% is reached, a finished product is obtained. The preparation method can meet the requirement for slump keeping time according to construction, and several slump retaining agents can be flexibly compounded to meet different construction requirements.

Description

technical field

[0001] The invention relates to the technical field of building material chemical additives, in particular to a preparation method of a release-controllable polycarboxylate slump-retaining agent. Background technique

[0002] As a green and environmentally friendly concrete chemical admixture, polycarboxylate water reducer is gradually widely used in the industry because of its excellent water reducing performance. Traditional polycarboxylate superplasticizers can usually achieve good dispersion or water-reducing performance, but they have limitations in maintaining the long-term working performance of concrete. Therefore, in order to solve this problem, people use a retarder and a water reducer to compound, but this brings problems of setting time and early strength. In order to better solve the problem of concrete work retention, scholars at home and abroad have researched and developed slump retaining agents.

[0003] However, due to the variety of cemen...

Examples

preparation example Construction

[0021] The present invention describes a preparation method of release controllable polycarboxylate slump retaining agent, which comprises the following steps:

[0022] 1) Add 144-180 parts of unsaturated polyoxyethylene ether monomer and 144-180 parts of deionized water into a three-necked flask according to the number of parts by mass, stir until dissolved, and heat up to 45-60°C during the period to keep warm;

[0023] 2) Dissolving 1.0-2.0 parts of chain transfer agent and 0.5-1.5 parts of initiator in 30-60 parts of deionized water according to parts by mass to prepare liquid A;

[0024] 3) Dissolving 10-20 parts of deionized water into liquid B according to the number of parts by mass;

[0025] 4) After step 1) is completed, drop A and B liquids into the three-necked flask at the same time, the dropping time is 180-210min, 150-180min respectively, continue to react after 60-80min, and add deionized water to dilute to the theoretical The solid content is 40% to get the f...

Embodiment 1

[0032] 1) According to the number of parts by mass, it will be prenyl alcohol polyoxyethylene ether (2400 molecular weight), and 144 parts of deionized water are added to a three-necked flask, stirred until dissolved, and heated to 45°C during the period to keep it warm;

[0033] 2) Dissolving 1.0 parts of sodium methallyl sulfonate chain transfer agent and 0.8 parts of ammonium persulfate initiator in 30 parts of deionized water by mass parts to prepare liquid A;

[0034] 3) Dissolving 17.28 parts of acrylic acid in 10 parts of deionized water in parts by mass to prepare liquid B; make the amount of acrylic acid account for 100% of the mass fraction of the anchoring group.

[0035] 4) After step 1) is completed, add liquids A and B dropwise to the three-necked flask at the same time. The dropping time is 180 min and 150 min respectively, and the reaction ends after 60 min. Add deionized water to dilute to a theoretical solid content of 40%. Get the finished product.

Embodiment 2

[0037] 1) Add 144 parts of prenyl alcohol polyoxyethylene ether (2400 molecular weight) and 144 parts of deionized water into a three-necked flask according to the number of parts by mass, stir until dissolved, and heat up to 50°C during the heating period;

[0038] 2) Dissolving 2.0 parts of sodium methallyl sulfonate chain transfer agent, 0.8 parts of ammonium persulfate, and 0.5 parts of hydrogen peroxide initiator in 30 parts of deionized water by mass parts to form liquid A;

[0039] 3) Dissolve 4 parts of acrylic acid, 2.8 parts of maleic anhydride, and 23.2 parts of hydroxyethyl acrylate in 20 parts of deionized water in parts by mass to form liquid B; make the amount of acrylic acid in the mass fraction of the entire anchoring group be 20%;

[0040] 4) After step 1) is completed, add liquid A and liquid B dropwise to the three-necked flask at the same time, and the dropwise addition time is 180 min and 150 min respectively, and continue to react for 60 minutes, then ad...

technical field

[0001] The invention relates to the technical field of building material chemical additives, in particular to a preparation method of a release-controllable polycarboxylate slump-retaining agent. Background technique

[0002] As a green and environmentally friendly concrete chemical admixture, polycarboxylate water reducer is gradually widely used in the industry because of its excellent water reducing performance. Traditional polycarboxylate superplasticizers can usually achieve good dispersion or water-reducing performance, but they have limitations in maintaining the long-term working performance of concrete. Therefore, in order to solve this problem, people use a retarder and a water reducer to compound, but this brings problems of setting time and early strength. In order to better solve the problem of concrete work retention, scholars at home and abroad have researched and developed slump retaining agents.

[0003] However, due to the variety of cemen...

Examples

preparation example Construction

[0021] The present invention describes a preparation method of release controllable polycarboxylate slump retaining agent, which comprises the following steps:

[0022] 1) Add 144-180 parts of unsaturated polyoxyethylene ether monomer and 144-180 parts of deionized water into a three-necked flask according to the number of parts by mass, stir until dissolved, and heat up to 45-60°C during the period to keep warm;

[0023] 2) Dissolving 1.0-2.0 parts of chain transfer agent and 0.5-1.5 parts of initiator in 30-60 parts of deionized water according to parts by mass to prepare liquid A;

[0024] 3) Dissolving 10-20 parts of deionized water into liquid B according to the number of parts by mass;

[0025] 4) After step 1) is completed, drop A and B liquids into the three-necked flask at the same time, the dropping time is 180-210min, 150-180min respectively, continue to react after 60-80min, and add deionized water to dilute to the theoretical The solid content is 40% to get the f...

Embodiment 1

[0032] 1) According to the number of parts by mass, it will be prenyl alcohol polyoxyethylene ether (2400 molecular weight), and 144 parts of deionized water are added to a three-necked flask, stirred until dissolved, and heated to 45°C during the period to keep it warm;

[0033] 2) Dissolving 1.0 parts of sodium methallyl sulfonate chain transfer agent and 0.8 parts of ammonium persulfate initiator in 30 parts of deionized water by mass parts to prepare liquid A;

[0034] 3) Dissolving 17.28 parts of acrylic acid in 10 parts of deionized water in parts by mass to prepare liquid B; make the amount of acrylic acid account for 100% of the mass fraction of the anchoring group.

[0035] 4) After step 1) is completed, add liquids A and B dropwise to the three-necked flask at the same time. The dropping time is 180 min and 150 min respectively, and the reaction ends after 60 min. Add deionized water to dilute to a theoretical solid content of 40%. Get the finished product.

Embodiment 2

[0037] 1) Add 144 parts of prenyl alcohol polyoxyethylene ether (2400 molecular weight) and 144 parts of deionized water into a three-necked flask according to the number of parts by mass, stir until dissolved, and heat up to 50°C during the heating period;

[0038] 2) Dissolving 2.0 parts of sodium methallyl sulfonate chain transfer agent, 0.8 parts of ammonium persulfate, and 0.5 parts of hydrogen peroxide initiator in 30 parts of deionized water by mass parts to form liquid A;

[0039] 3) Dissolve 4 parts of acrylic acid, 2.8 parts of maleic anhydride, and 23.2 parts of hydroxyethyl acrylate in 20 parts of deionized water in parts by mass to form liquid B; make the amount of acrylic acid in the mass fraction of the entire anchoring group be 20%;

[0040] 4) After step 1) is completed, add liquid A and liquid B dropwise to the three-necked flask at the same time, and the dropwise addition time is 180 min and 150 min respectively, and continue to react for 60 minutes, then ad...

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