High-performance polycarboxylic acid slump-retaining water reducing agent and preparation process thereof

Abstract

The invention discloses a high-performance polycarboxylic acid slump-retaining water reducing agent and a preparation process thereof. The high-performance polycarboxylic acid slump-retaining water reducing agent is prepared from the following raw materials in parts by weight: 390-400 parts of deionized water, 1-2 parts of caustic soda flakes (sodium hydroxide), 350-360 parts of six-carbon polyether monomers, 9-11 parts of 108 auxiliaries, 3-3.5 parts of hydrogen peroxide, 1-2 parts of a ferrous sulfate solution, a dripping material A, a dripping material B and 9-11 parts of a neutralizer. The dropping material A comprises the following raw materials: 65-75 parts of deionized water and 20-30 parts of acrylic acid; and the dropping material B comprises the following raw materials in parts by weight: 95-105 parts of deionized water, 1-1.5 parts of a chain transfer agent and 0.6-0.8 part of a reducing agent. The invention belongs to the technical field of high-performance polycarboxylic acid slump retaining type water reducing agents, and provides a high-performance polycarboxylic acid slump retaining type water reducing agent and a preparation process thereof, which can improve the slump retaining property of concrete and avoid the problems of concrete segregation, delayed bleeding and overlong setting time caused by overquick slump loss.

Description

Technical Field

[0001] The invention belongs to the technical field of high-performance polycarboxylic acid slump-retaining water reducing agent, and in particular relates to a high-performance polycarboxylic acid slump-retaining water reducing agent and a preparation process thereof. Background Art

[0002] Water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete basically unchanged. It has a dispersing effect on cement particles, can improve its workability, reduce unit water consumption, improve the fluidity of concrete mixtures, and can also reduce unit cement consumption and save cement. It can not only improve the performance of concrete, but also save costs.

[0003] Polycarboxylic acid water-reducing agent is a high-performance water-reducing agent and a cement dispersant used in cement concrete. It is widely used in projects such as roads, bridges, dams, tunnels, and high-rise buildings. The existing polycarboxylic acid slump-retaining water-reducing agent has poor slump retention during concrete construction, and the slump loss is too fast, which easily leads to problems such as concrete segregation, delayed bleeding, and long setting time. In addition, the preparation process is complicated. Therefore, we propose a high-performance polycarboxylic acid slump-retaining water-reducing agent and its preparation process to solve the above problems. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a high-performance polycarboxylic acid slump-retaining water-reducing agent and a preparation process thereof, which can improve the slump retention of concrete and avoid the problems of concrete segregation, delayed bleeding and excessive setting time caused by excessive slump loss.

[0005] The technical scheme adopted by the present invention is as follows: a high-performance polycarboxylic acid slump-retaining water reducer comprises the following raw materials: 380-400 parts of deionized water, 1-2 parts of flake caustic soda (sodium hydroxide), 340-360 parts of hexacarbon polyether monomer, 8-12 parts of 108 additive, 3-4 parts of hydrogen peroxide, 0.5-2.5 parts of ferrous sulfate solution, and 8-12 parts of dropwise addition material A, dropwise addition material B and a neutralizer.

[0006] The dropwise addition material A comprises the following raw materials: 60-75 parts of deionized water and 20-40 parts of acrylic acid.

[0007] The dropwise addition material B comprises the following raw materials: 90-110 parts of deionized water, 1-2 parts of a chain transfer agent and 0.5-1 part of a reducing agent.

[0008] The preferred component distribution ratio of the high-performance polycarboxylic acid slump-retaining water reducer of the present invention is: 390-400 parts of deionized water, 1-2 parts of flake caustic soda (sodium hydroxide), 350-360 parts of hexacarbon polyether monomer, 9-11 parts of 108 auxiliary agent, 3-3.5 parts of hydrogen peroxide, 1-2 parts of ferrous sulfate solution, and 9-11 parts of dropwise addition material A, dropwise addition material B and neutralizer.

[0009] The dropwise addition material A comprises the following raw materials: 65-75 parts of deionized water and 20-30 parts of acrylic acid.

[0010] The dropwise addition material B comprises the following raw materials: 95-105 parts of deionized water, 1-1.5 parts of a chain transfer agent and 0.6-0.8 parts of a reducing agent.

[0011] The optimal component ratio of the high-performance polycarboxylic acid collapse-preserving water reducer of the present invention is: 400 parts of deionized water, 1.5 parts of flake caustic soda (sodium hydroxide), 360 parts of hexacarbon polyether monomer, 10 parts of 108 auxiliary agent, 3 parts of hydrogen peroxide, 2 parts of ferrous sulfate solution, and 10 parts of drop material A, drop material B and neutralizer.

[0012] The dropwise addition material A comprises the following raw materials: 65 parts of deionized water and 24 parts of acrylic acid.

[0013] The dropwise addition material B includes the following raw materials: 100 parts of deionized water, 1.2 parts of a chain transfer agent and 0.75 parts of a reducing agent.

[0014] The preparation process of the high-performance polycarboxylic acid collapse-preserving water-reducing agent of the present invention is:

[0015] Step 1: Add deionized water into the reactor and stir with caustic soda flakes;

[0016] Step 2: Add hexacarbon polyether monomer into deionized water mixed with caustic soda to dissolve;

[0017] Step 3: After the hexacarbon polyether monomer is dissolved to 90%, start to prepare dropwise addition material A and dropwise addition material B;

[0018] Step 4: Add 108 additive, hydrogen peroxide and ferrous sulfate solution to the reaction kettle in sequence;

[0019] Step 5: After 3 minutes, start dripping material A and dripping material B at the same time after the feeding is completed;

[0020] Step 6: Add neutralizer to adjust pH value;

[0021] Step 7: After the addition is completed, continue stirring for 50 minutes, add deionized water dissolved with caustic soda flakes, continue stirring for 10 minutes, and then take samples for testing.

[0022] Furthermore, the concentration of hydrogen peroxide in step 4 is 27.5%, and the concentration of ferrous sulfate solution is 0.4%-1%.

[0023] Furthermore, in the step 5, the dropping time of material A and material B are 50 min and 60 min respectively, and the dropping time error is controlled within ±5 min.

[0024] Furthermore, during the entire production process, the starting temperature is ≥5°C, and the temperature during the reaction is ≤45°C.

[0025] Furthermore, in step seven, the components of deionized water and caustic soda added are 30 parts and 5 parts respectively.

[0026] After adopting the above technical scheme, the beneficial effects of the present invention are as follows: a high-performance polycarboxylic acid slump-retaining water-reducing agent and a preparation process thereof of the present invention can improve the slump retention of concrete, avoid the problems of concrete segregation, delayed bleeding, and excessive setting time caused by excessive slump loss. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] Example 1: Weigh the raw materials according to the following component proportions: 380-400 parts of deionized water, 1-2 parts of flake caustic soda (sodium hydroxide), 340-360 parts of hexacarbon polyether monomer, 8-12 parts of 108 additive, 3-4 parts of hydrogen peroxide, 0.5-2.5 parts of ferrous sulfate solution, and add dropwise material A, dropwise material B and 8-12 parts of neutralizer.

[0030] The dropwise addition material A comprises the following raw materials: 60-75 parts of deionized water and 20-40 parts of acrylic acid.

[0031] The dropwise addition material B comprises the following raw materials: 90-110 parts of deionized water, 1-2 parts of a chain transfer agent and 0.5-1 part of a reducing agent.

[0032] Example 2: Weigh the raw materials according to the following component proportions: 390-400 parts of deionized water, 1-2 parts of flake caustic soda (sodium hydroxide), 350-360 parts of hexacarbon polyether monomer, 9-11 parts of 108 additive, 3-3.5 parts of hydrogen peroxide, 1-2 parts of ferrous sulfate solution, and dropwise add material A, dropwise add material B and neutralizer 9-11 parts.

[0033] The dropwise addition material A comprises the following raw materials: 65-75 parts of deionized water and 20-30 parts of acrylic acid.

[0034] The dropwise addition material B comprises the following raw materials: 95-105 parts of deionized water, 1-1.5 parts of a chain transfer agent and 0.6-0.8 parts of a reducing agent.

[0035] Example 3: Weigh the raw materials according to the following component proportions: 400 parts of deionized water, 1.5 parts of flake caustic soda (sodium hydroxide), 360 parts of hexacarbon polyether monomer, 10 parts of 108 additives, 3 parts of hydrogen peroxide, 2 parts of ferrous sulfate solution, and 10 parts of dropwise addition material A, dropwise addition material B and neutralizer.

[0036] The dropwise addition material A comprises the following raw materials: 65 parts of deionized water and 24 parts of acrylic acid.

[0037] The dropwise addition material B includes the following raw materials: 100 parts of deionized water, 1.2 parts of a chain transfer agent and 0.75 parts of a reducing agent.

[0038] When used specifically, a reaction kettle is required during preparation.

[0039] The specific preparation process of the high-performance polycarboxylic acid collapse-retaining water reducer of the present invention is as follows:

[0040] Step 1: Add deionized water into the reactor and stir with caustic soda flakes;

[0041] Step 2: Add hexacarbon polyether monomer into deionized water mixed with caustic soda to dissolve;

[0042] Step 3: After the hexacarbon polyether monomer is dissolved to 90%, start to prepare dropwise addition material A and dropwise addition material B;

[0043] Step 4: Add 108 additive, hydrogen peroxide and ferrous sulfate solution to the reaction kettle in sequence;

[0044] Step 5: After 3 minutes, start dripping material A and dripping material B at the same time after the feeding is completed;

[0045] Step 6: Add neutralizer to adjust pH value;

[0046] Step 7: After the addition is completed, continue stirring for 50 minutes, add deionized water dissolved with caustic soda flakes, continue stirring for 10 minutes, and then take samples for testing.

[0047] Furthermore, the concentration of hydrogen peroxide in step 4 is 27.5%, and the concentration of ferrous sulfate solution is 0.4%-1%.

[0048] Furthermore, in the step 5, the dropping time of material A and material B are 50 min and 60 min respectively, and the dropping time error is controlled within ±5 min.

[0049] Furthermore, during the entire production process, the starting temperature is ≥5°C, and the temperature during the reaction is ≤45°C.

[0050] Furthermore, in step seven, the components of deionized water and caustic soda added are 30 parts and 5 parts respectively.

[0051] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents. In short, if those skilled in the art are inspired by them and design structural modes and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they shall all fall within the scope of protection of the present invention.

Claims

1. A high-performance polycarboxylic acid slump-retaining water reducer, characterized in that: The raw materials include the following components: 380-400 parts of deionized water, 1-2 parts of flake caustic soda (sodium hydroxide), 340-360 parts of hexacarbon polyether monomer, 8-12 parts of 108 auxiliary agent, 3-4 parts of hydrogen peroxide, 0.5-2.5 parts of ferrous sulfate solution, and 8-12 parts of drop material A, drop material B and neutralizer. The dropwise addition material A comprises the following raw materials: 60-75 parts of deionized water and 20-40 parts of acrylic acid. The dropwise addition material B comprises the following raw materials: 90-110 parts of deionized water, 1-2 parts of a chain transfer agent and 0.5-1 part of a reducing agent.

2. A high-performance polycarboxylic acid slump-retaining water reducer according to claim 1, characterized in that: The raw materials include the following components: 390-400 parts of deionized water, 1-2 parts of flake caustic soda (sodium hydroxide), 350-360 parts of hexacarbon polyether monomer, 9-11 parts of 108 auxiliary agent, 3-3.5 parts of hydrogen peroxide, 1-2 parts of ferrous sulfate solution, and 9-11 parts of drop material A, drop material B and neutralizer. The dropwise addition material A comprises the following raw materials: 65-75 parts of deionized water and 20-30 parts of acrylic acid. The dropwise addition material B comprises the following raw materials: 95-105 parts of deionized water, 1-1.5 parts of a chain transfer agent and 0.6-0.8 parts of a reducing agent.

3. A high-performance polycarboxylic acid slump-retaining water reducer according to claim 1, characterized in that: The raw materials include the following components: 400 parts of deionized water, 1.5 parts of flake caustic soda (sodium hydroxide), 360 parts of hexacarbon polyether monomer, 10 parts of 108 auxiliary agent, 3 parts of hydrogen peroxide, 2 parts of ferrous sulfate solution, and 10 parts of drop material A, drop material B and neutralizer. The dropwise addition material A comprises the following raw materials: 65 parts of deionized water and 24 parts of acrylic acid. The dropwise addition material B includes the following raw materials: 100 parts of deionized water, 1.2 parts of a chain transfer agent and 0.75 parts of a reducing agent.

4. A preparation process of a high-performance polycarboxylic acid collapse-retaining water-reducing agent, characterized in that: The steps include: Step 1: Add deionized water into the reactor and stir with caustic soda flakes; Step 2: Add hexacarbon polyether monomer into deionized water mixed with caustic soda to dissolve; Step 3: After the hexacarbon polyether monomer is dissolved to 90%, start to prepare dropwise addition material A and dropwise addition material B; Step 4: Add 108 additive, hydrogen peroxide and ferrous sulfate solution to the reaction kettle in sequence; Step 5: After 3 minutes, start dripping material A and dripping material B at the same time after the feeding is completed; Step 6: Add neutralizer to adjust pH value; Step 7: After the addition is completed, continue stirring for 50 minutes, add deionized water dissolved with caustic soda flakes, continue stirring for 10 minutes, and then take samples for testing.