阅读说明：本技术 一种混凝土粘度改性剂及其制备方法 (Concrete viscosity modifier and preparation method thereof ) 是由 朱永昌 庞永献 易钢招 李丹 于 2021-09-30 设计创作，主要内容包括：本发明公开一种混凝土粘度改性剂及其制备方法,该粘度改性剂包括：原料主要成分及重量份数如下：支链淀粉0.1～8份、丁二醇1～8份、二丙二醇二甲醚1～12份、温伦胶10～40份、环状糊精10～20份、聚丙烯酸钠0.2～0.8份、碳酰胺0.1～0.5份、氢氧化钠0.1～10份、去离子水900.7～977.5份。本发明提出的粘度改性剂合成工艺简单,常温即可合成,能耗低,原料易得无害,绿色环保,适于工业生产；粘度改性剂可以解决机制砂断级配造成的混凝土状态问题,提高混凝土的包裹性,和易性,可以提高混凝土的泵送性。(The invention discloses a concrete viscosity modifier and a preparation method thereof, wherein the viscosity modifier comprises the following components: the main components and the parts by weight of the raw materials are as follows: 0.1-8 parts of amylopectin, 1-8 parts of butanediol, 1-12 parts of dipropylene glycol dimethyl ether, 10-40 parts of welan gum, 10-20 parts of cyclodextrin, 0.2-0.8 part of sodium polyacrylate, 0.1-0.5 part of carbamide, 0.1-10 parts of sodium hydroxide and 900.7-977.5 parts of deionized water. The viscosity modifier provided by the invention has the advantages of simple synthesis process, low energy consumption, easily available and harmless raw materials, greenness and environmental protection, and is suitable for industrial production; the viscosity modifier can solve the concrete state problem caused by the mechanical sand grading, improve the wrapping property and the workability of the concrete and improve the pumping property of the concrete.)

1. A concrete viscosity modifier, comprising: the main components and the parts by weight of the raw materials are as follows: 0.1-8 parts of amylopectin, 1-8 parts of butanediol, 1-12 parts of dipropylene glycol dimethyl ether, 10-40 parts of welan gum, 10-20 parts of cyclodextrin, 0.2-0.8 part of sodium polyacrylate, 0.1-0.5 part of carbamide, 0.1-10 parts of sodium hydroxide and 900.7-977.5 parts of deionized water.

2. The concrete viscosity modifier of claim 1, wherein the butanediol is 1, 3-butanediol, or 1, 4-butanediol.

3. The preparation method of the concrete viscosity modifier is characterized by comprising the following steps:

firstly, weighing a part of deionized water in a beaker, adding sodium hydroxide, and stirring by using a glass rod until the deionized water is completely dissolved;

adding amylopectin, butanediol, dipropylene glycol dimethyl ether and cyclodextrin, and fully stirring for dissolving;

step three, respectively adding sodium polyacrylate, welan gum and carbamide, stirring and dissolving, and then adding a proper amount of water;

and step four, uniformly stirring to obtain the concrete viscosity modifier.

Technical Field

The invention relates to the technical field of concrete, in particular to a concrete viscosity modifier and a preparation method thereof.

Background

Along with the rapid development of the infrastructure of China, the demand of concrete increases year by year, the national environment protection is increasingly emphasized, the exploitation of natural sand is limited, the use of machine-made sand is increasingly common, but the machine-made sand is easy to have the conditions of more mud content and unreasonable grading distribution, so that the problems of poor wrapping property, no slurry hanging of materials, poor workability, difficult pumping and the like of the concrete occur.

At present, the patents related to annual viscosity modifiers are few, and Chinese patent CN110804123A discloses a preparation method of machine-made sand concrete viscosity modifiers, wherein the reaction temperature needs to be 45-80 ℃, the process temperature requirement is high, the reaction time is more than 10 hours, the energy consumption is high, and the process is complex.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a concrete viscosity modifier and a preparation method thereof.

In order to achieve the purpose, the invention firstly provides a concrete viscosity modifier, and the concrete scheme is as follows:

the concrete viscosity modifier comprises the following raw materials in parts by weight: 0.1-8 parts of amylopectin, 1-8 parts of butanediol, 1-12 parts of dipropylene glycol dimethyl ether, 10-40 parts of welan gum, 10-20 parts of cyclodextrin, 0.2-0.8 part of sodium polyacrylate, 0.1-0.5 part of carbamide, 0.1-10 parts of sodium hydroxide and 900.7-977.5 parts of deionized water.

Preferably, the butanediol is 1, 3-butanediol or 1, 4-butanediol.

The invention also provides a preparation method of the concrete viscosity modifier, which comprises the following steps:

firstly, weighing a part of deionized water in a beaker, adding sodium hydroxide, and stirring by using a glass rod until the deionized water is completely dissolved;

adding amylopectin, butanediol, dipropylene glycol dimethyl ether and cyclodextrin, and fully stirring for dissolving;

step three, respectively adding sodium polyacrylate, welan gum and carbamide, stirring and dissolving, and then adding a proper amount of water;

and step four, uniformly stirring to obtain the concrete viscosity modifier.

By adopting the technical scheme of the invention, the invention has the following beneficial effects:

1. the viscosity modifier provided by the invention has the advantages of simple synthesis process, capability of being synthesized at normal temperature, low energy consumption, easily available and harmless raw materials, greenness and environmental friendliness, and suitability for industrial production.

2. The viscosity modifier provided by the invention can solve the concrete state problem caused by mechanical sand grading, and improve the wrapping property and the workability of concrete.

3. The viscosity modifier provided by the invention can improve the pumping property of concrete.

Detailed Description

The present invention will be further described with reference to the following examples.

The first embodiment is as follows:

firstly weighing 500g of deionized water in a 2000ml beaker; then adding 0.5g of sodium hydroxide, and stirring by using a glass rod until the sodium hydroxide is completely dissolved; then adding 0.8g of amylopectin and 10g of cyclodextrin, and fully stirring for dissolving; respectively adding 0.4g of sodium polyacrylate, 30g of welan gum, 2g of 1, 4-butanediol, 3g of dipropylene glycol dimethyl ether and 0.2g of carbamide, stirring and dissolving, and supplementing water to 1 kg; and then uniformly stirring to obtain the concrete viscosity modifier.

Example two:

weighing 500g of deionized water in a 2000ml beaker; then 2g of sodium hydroxide is added, and the mixture is stirred by a glass rod until the sodium hydroxide is completely dissolved; then adding 7g of amylopectin and 20g of cyclodextrin, and fully stirring for dissolving; respectively adding 0.2g of sodium polyacrylate, 10g of welan gum, 5g of 1, 4-butanediol, 10g of dipropylene glycol dimethyl ether and 0.1g of carbamide, stirring and dissolving, and supplementing water to 1 kg; and then uniformly stirring to obtain the concrete viscosity modifier.

Example three:

weighing 500g of deionized water in a 2000ml beaker; then 10g of sodium hydroxide is added, and the mixture is stirred by a glass rod until the sodium hydroxide is completely dissolved; then adding 0.6g of amylopectin and 15g of cyclodextrin, and fully stirring for dissolving; respectively adding 0.8g of sodium polyacrylate, 5g of 1, 3-butanediol, 6g of dipropylene glycol dimethyl ether, 30g of welan gum and 0.5g of carbamide, stirring and dissolving, and supplementing water to 1 kg; and then uniformly stirring to obtain the concrete viscosity modifier.

Example four:

weighing 500g of deionized water in a 2000ml beaker; then adding 5g of sodium hydroxide, stirring by using a glass rod until the sodium hydroxide is completely dissolved, then adding 8g of amylopectin and 15g of cyclodextrin, and fully stirring for dissolving; respectively adding 0.6g of sodium polyacrylate, 6g of 1, 3-butanediol, 4g of dipropylene glycol dimethyl ether, 32g of welan gum and 0.3g of carbamide, stirring and dissolving, and supplementing water to 1 kg; and then uniformly stirring to obtain the concrete viscosity modifier.

For the four embodiments, viscosity verification and state strength verification are performed, in the embodiment, the water reducing agent is compounded by polycarboxylic acid mother liquor, wherein the PCB is water-reducing type 45% solid-containing mother liquor, the PBA is slump-retaining type 45% solid-containing mother liquor, and the code 2002 is sodium gluconate powder (with purity of 98%).

The concrete tests on day one refer to table 1 below:

TABLE 1

The next day concrete tests refer to table 2 below:

TABLE 2

Through the two concrete tests, the concrete state is obviously improved, the viscosity and the wrapping property are obviously improved, the slump retaining property is certain, no adverse effect is caused on the strength of the concrete, and even the strength can be enhanced by 2-6 MPa after the viscosity modifier in the embodiment is added.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the present specification and directly/indirectly applied to other related technical fields within the spirit of the present invention are included in the scope of the present invention.