阅读说明：本技术 一种混凝土密实增强剂及其制备方法 (Concrete compaction reinforcing agent and preparation method thereof ) 是由 钟根芽 滕文生 孙亮 张继业 于 2020-07-07 设计创作，主要内容包括：本发明涉及建筑材料的技术领域,具体涉及一种混凝土密实增强剂及其制备方法。一种混凝土密实增强剂,包括如下重量份的各组分：丙烯酸45-55份,水95-105份,链转移剂30-40份,引发剂4-6份。其可以有效提高混凝土的抗裂性和密实度。混凝土密实增强剂的制备方法,包括如下步骤：链转移剂稀释：将链转移剂加入水中,并加热至50-85℃；聚合反应：将丙烯酸和引发剂混合,再加入稀释的链转移剂,搅拌反应2.5-3.5h,得到聚丙烯酸钠；调pH：聚合反应结束后,冷却至38-42℃,再采用NaOH调聚丙烯酸钠的pH,将pH调至8.0-9.0。其制备流程简单,制备的混凝土密实增强剂效果更佳。(The invention relates to the technical field of building materials, in particular to a concrete compaction reinforcing agent and a preparation method thereof. A concrete compaction reinforcing agent comprises the following components in parts by weight: 45-55 parts of acrylic acid, 95-105 parts of water, 30-40 parts of a chain transfer agent and 4-6 parts of an initiator. The concrete can effectively improve the crack resistance and the compactness of the concrete. The preparation method of the concrete compaction reinforcing agent comprises the following steps: diluting a chain transfer agent: adding a chain transfer agent into water, and heating to 50-85 ℃; polymerization reaction: mixing acrylic acid and an initiator, adding a diluted chain transfer agent, and stirring for reacting for 2.5-3.5h to obtain sodium polyacrylate; adjusting the pH value: after the polymerization reaction is finished, cooling to 38-42 ℃, adjusting the pH of the sodium polyacrylate by using NaOH, and adjusting the pH to 8.0-9.0. The preparation process is simple, and the prepared concrete compaction reinforcing agent has better effect.)

1. A concrete compaction reinforcing agent is characterized in that: the paint comprises the following components in parts by weight: 45-55 parts of acrylic acid, 95-105 parts of water, 30-40 parts of a chain transfer agent and 4-6 parts of an initiator.

2. A concrete compaction enhancer according to claim 1, wherein: the acrylic acid is monomer acrylic acid.

3. A concrete compaction enhancer according to claim 1, wherein: the water is deionized water.

4. A concrete compaction enhancer according to claim 1, wherein: the chain transfer agent is sodium phosphate.

5. A concrete compaction enhancer according to claim 1, wherein: the initiator is one of sodium persulfate or ammonium persulfate.

6. A method of producing a concrete reinforcing compaction agent according to any one of claims 1 to 5, wherein: the method comprises the following steps:

diluting a chain transfer agent: adding a chain transfer agent into water, and heating to 50-85 ℃;

polymerization reaction: mixing acrylic acid and an initiator, adding a diluted chain transfer agent, and stirring for reacting for 2.5-3.5h to obtain sodium polyacrylate;

adjusting the pH value: after the polymerization reaction is finished, cooling to 38-42 ℃, adjusting the pH of the sodium polyacrylate by using NaOH, and adjusting the pH to 8.0-9.0.

7. The method of claim 6, wherein: the molecular weight of the sodium polyacrylate is 1200-1600.

8. The method of claim 6, wherein: the NaOH is 30% NaOH by mass concentration.

Technical Field

The invention relates to the technical field of building materials, in particular to a concrete compaction reinforcing agent and a preparation method thereof.

Background

The main tasks of hydraulic concrete buildings are water retaining, water diversion, water conveying and water drainage, which are closely related to 'water', and water is non-porous and non-permeable, especially pressure water. Therefore, leakage is one of the major diseases common to hydraulic concrete buildings.

Cracks are common diseases of hydraulic concrete buildings, and the control of the concrete cracks is the key for improving the water resistance of a concrete structure. The C30 concrete has 0.1mm penetrating crack, the permeability coefficient in the crack is 108 times of that of the matrix, and water can penetrate through the concrete with the thickness of 1m only within about 2min under the high water pressure of 1 m. The concrete cracks, the thickness of the protective layer of the concrete structure is reduced, the transmission of aggressive media, air and moisture to the interior of the concrete structure is accelerated, the activation corrosion time of the reinforcing steel bars in the concrete structure is shortened, and the service life of the concrete structure is shortened.

Therefore, improving workability, compactness and crack resistance of concrete is the key to improving durability of concrete. Most of products and related inventions in the market focus on the aspects of seepage resistance, freezing resistance, steel bar corrosion resistance, chloride ion permeation resistance and sulfate corrosion resistance, and almost do not pay attention to crack resistance and workability.

Disclosure of Invention

The invention aims to provide a concrete compaction reinforcing agent which can effectively improve the cracking resistance and the compactness of concrete.

The invention also aims to provide a preparation method of the concrete compaction reinforcing agent, which has simple preparation process and better effect.

The technical problem to be solved by the invention is realized by adopting the following technical scheme.

The invention provides a concrete compaction reinforcing agent which comprises the following components in parts by weight: 45-55 parts of acrylic acid, 95-105 parts of water, 30-40 parts of a chain transfer agent and 4-6 parts of an initiator.

Further, in some embodiments of the present invention, the acrylic acid is monomeric acrylic acid.

Further, in some embodiments of the present invention, the water is deionized water.

Further, in some embodiments of the present invention, the chain transfer agent is sodium phosphate.

Further, in some embodiments of the present invention, the initiator is one of sodium persulfate or ammonium persulfate.

The invention provides a preparation method of the concrete compaction reinforcing agent, which comprises the following steps:

diluting a chain transfer agent: adding a chain transfer agent into water, and heating to 50-85 ℃;

polymerization reaction: mixing acrylic acid and an initiator, adding a diluted chain transfer agent, and stirring for reacting for 2.5-3.5h to obtain sodium polyacrylate;

adjusting the pH value: after the polymerization reaction is finished, cooling to 38-42 ℃, adjusting the pH of the sodium polyacrylate by using NaOH, and adjusting the pH to 8.0-9.0.

Further, in some embodiments of the invention, the sodium polyacrylate has a molecular weight of 1200-1600.

Further, in some embodiments of the present invention, the NaOH is 30% NaOH by mass.

The invention provides a concrete compaction reinforcing agent and a preparation method thereof, and the concrete compaction reinforcing agent at least has the following beneficial effects:

acrylic acid is used as a main raw material to obtain polyacrylic acid, so that the workability, compactness and cracking resistance of concrete can be effectively improved, and the service life of concrete is effectively prolonged.

The preparation method is simple, and the prepared concrete compaction reinforcing agent has better effect after the pH is adjusted to 8.0-9.0.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to specific examples.

The technical problem to be solved by the invention is realized by adopting the following technical scheme.

The invention provides a concrete compaction reinforcing agent which comprises the following components in parts by weight: 45-55 parts of acrylic acid, 95-105 parts of water, 30-40 parts of a chain transfer agent and 4-6 parts of an initiator.

In the embodiment, the polyacrylic acid is obtained by adopting the acrylic acid as a main raw material, so that the workability, compactness and cracking resistance of the concrete can be effectively improved, and the service life of the concrete can be effectively prolonged.

Further, in some embodiments of the present invention, the acrylic acid is monomeric acrylic acid.

Further, in some embodiments of the present invention, the water is deionized water.

Further, in some embodiments of the present invention, the chain transfer agent is sodium phosphate.

Further, in some embodiments of the present invention, the initiator is one of sodium persulfate or ammonium persulfate.

The invention provides a preparation method of the concrete compaction reinforcing agent, which comprises the following steps: diluting a chain transfer agent: adding a chain transfer agent into water, and heating to 50-85 ℃; polymerization reaction: mixing acrylic acid and an initiator, adding a diluted chain transfer agent, and stirring for reacting for 2.5-3.5h to obtain sodium polyacrylate; adjusting the pH value: after the polymerization reaction is finished, cooling to 38-42 ℃, adjusting the pH of the sodium polyacrylate by using NaOH, and adjusting the pH to 8.0-9.0.

The preparation method is simple, and the prepared concrete compaction reinforcing agent has better effect after the pH is adjusted to 8.0-9.0.

Further, in some embodiments of the invention, the sodium polyacrylate has a molecular weight of 1200-1600.

Further, in some embodiments of the present invention, the NaOH is 30% NaOH by mass.

The features and properties of the present invention are described in further detail below with reference to examples.