阅读说明：本技术 一种混凝土用高减水减水剂及其制备方法 (High water-reducing water reducer for concrete and preparation method thereof ) 是由 张先德 贺庆 易洪英 陈俊 曾祥礼 黄小蓉 沈丹妮 于 2020-07-10 设计创作，主要内容包括：本发明公开了一种混凝土用高减水减水剂,按照质量组份的配方如下：前加水3000-3800份、烯丙基聚氧乙烯醚3000-3250份、2.5％质量百分浓度的高锰酸钾液13-15份、27.5％质量百分浓度的双氧水25-27份、混合液1892-1904份、氢氧化钠45-60份、后加水1600-1700份；前加水和后加水均为清水；混合液包括维生素C7-8份,链转移剂20-21份,丙烯酸410-420份,水1455份。制备方法包括以下步骤,加入前加水,加入烯丙基聚氧乙烯醚；将高锰酸钾液和双氧水依次加入；加入混合液；加入氢氧化钠；加入后加水。使用本发明制备的混凝土成本较低；同时也可以较为明显的提高混凝土的减少率,增强混凝土的包裹性,减低施工难度,提升施工效率,更为适合高标号的混凝土。(The invention discloses a high water reducing agent for concrete, which comprises the following components in parts by mass: adding 3000-3800 parts of water, 3000-3250 parts of allyl polyoxyethylene ether, 13-15 parts of potassium permanganate solution with the mass percentage concentration of 2.5%, 25-27 parts of hydrogen peroxide with the mass percentage concentration of 27.5%, 1892-1904 parts of mixed solution, 45-60 parts of sodium hydroxide and 1600-1700 parts of water; the front water adding and the rear water adding are both clear water; the mixed liquid comprises 7-8 parts of vitamin C, 20-21 parts of chain transfer agent, 410-420 parts of acrylic acid and 1455 parts of water. The preparation method comprises the following steps of adding water before adding, and adding allyl polyoxyethylene ether; sequentially adding potassium permanganate solution and hydrogen peroxide; adding the mixed solution; adding sodium hydroxide; after the addition, water was added. The concrete prepared by the invention has lower cost; meanwhile, the reduction rate of the concrete can be obviously improved, the wrapping performance of the concrete is enhanced, the construction difficulty is reduced, the construction efficiency is improved, and the concrete is more suitable for high-grade concrete.)

1. The high water-reducing water reducing agent for concrete is characterized by comprising the following components in parts by mass:

adding 3000-3800 parts of water, 3000-3250 parts of allyl polyoxyethylene ether, 13-15 parts of potassium permanganate solution with the mass percentage concentration of 2.5%, 25-27 parts of hydrogen peroxide with the mass percentage concentration of 27.5%, 1892-1904 parts of mixed solution, 45-60 parts of sodium hydroxide and 1600-1700 parts of water;

the front water adding part and the rear water adding part are both clear water;

the mixed liquid comprises 7-8 parts of vitamin C, 20-21 parts of chain transfer agent, 420 parts of acrylic acid 410-420 parts and 1455 parts of water.

2. The water reducing agent for concrete according to claim 1, which is characterized by comprising the following components in parts by mass: 3560 parts of water, 3150 parts of allyl polyoxyethylene ether, 13-15 parts of 2.5% by mass potassium permanganate solution, 25-27 parts of 27.5% by mass hydrogen peroxide, 1892 and 1904 parts of mixed solution, 45-60 parts of sodium hydroxide and 1650 parts of post-added water;

the front water adding part and the rear water adding part are both clear water;

the mixed liquid comprises 7-8 parts of vitamin C, 20-21 parts of chain transfer agent, 420 parts of acrylic acid 410-420 parts and 1455 parts of water.

3. The water reducing agent for concrete according to claim 1, which is characterized by comprising the following components in parts by mass: 3560 parts of water, 3150 parts of allyl polyoxyethylene ether, 14 parts of 2.5% potassium permanganate solution, 25-27 parts of 27.5% hydrogen peroxide solution, 1898 parts of mixed solution, 55 parts of sodium hydroxide and 1650 parts of post-added water are added in the first step;

the front water adding part and the rear water adding part are both clear water;

the mixed liquid comprises 7-8 parts of vitamin C, 20-21 parts of chain transfer agent, 420 parts of acrylic acid 410-420 parts and 1455 parts of water.

4. The water reducing agent for concrete according to any one of claims 1 to 3, wherein the sodium hydroxide is 225 parts by mass of a 20% sodium hydroxide solution.

5. The method for preparing a water reducing agent for concrete according to any one of claims 1 to 3, comprising the steps of,

s1, adding water into the reaction tank, adding allyl polyoxyethylene ether into the reaction tank, and continuing stirring for 10-20 minutes after the addition is finished;

s2, sequentially adding the potassium permanganate solution and hydrogen peroxide into the reaction tank, and continuing to stir for 10-15 minutes after the addition is finished;

s3, adding the mixed solution into a reaction tank, and continuing stirring for 30-40 minutes after the addition is finished;

s4, adding the sodium hydroxide solution into the reaction tank, and continuing stirring for 10-15 minutes after the addition is finished;

and S5, adding water into the reaction tank, and continuing stirring for 15-20 minutes after the water is added.

6. The preparation method of the water reducing agent for concrete according to claim 5, wherein the temperature of water added before the water is added into the reaction tank is 10-50 ℃.

7. The preparation method of the water reducing agent for concrete according to claim 5, wherein the reaction tank is always in a stirring state from the beginning in the whole preparation process, and the stirring speed is kept at 55-75 r/min.

8. The method for preparing a water reducing agent for concrete according to claim 5, wherein in step S3, the mixed solution is added dropwise into the reaction tank.

9. The method for preparing a water reducing agent for concrete according to claim 8, wherein the dropping time of the mixed solution is 175-185 minutes.

10. The preparation method of the water reducing agent for concrete according to claim 5, wherein the temperature in the reaction tank is kept at 25-35 ℃ during the whole preparation process.

Technical Field

The invention relates to the field of transportation loading and unloading, in particular to a high water-reducing water reducer for concrete and a preparation method thereof.

Background

The commercial concrete is prepared according to the requirements of the use position and the use, and the formula of the commercial concrete is personalized, and the core of the preparation is a concrete additive. The concrete water reducing agent is a special concrete additive, and is a concrete admixture capable of reducing the mixing water consumption under the condition of maintaining the slump of concrete basically unchanged. After the concrete water reducing agent is added into the concrete mixture, the cement mixture has a dispersing effect on cement particles, the workability of the concrete mixture can be improved, the unit water consumption is reduced, and the fluidity of the concrete mixture is improved; or the unit cement consumption is reduced, and the cement is saved.

The water reducing effect of the water reducing agent on the market at present is poor (only 28% at most), the concrete collapse protection effect is poor, the concrete wrapping performance is also poor (the concrete needs to be vibrated and compacted for a long time in the construction process, the construction progress is reduced, the construction difficulty is also improved), the using amount of a certain collapse protection agent needs to be increased, and meanwhile, a concrete state regulator needs to be added.

Disclosure of Invention

In view of the defects in the prior art, the invention aims to provide a high water reducing agent for concrete and a preparation method thereof, the prepared concrete has the water reducing rate of up to 50 percent, the total amount of the used collapse prevention agent is lower, the use amount of a concrete regulator is not used or reduced, and the cost is saved; meanwhile, the reduction rate of the concrete can be obviously improved, the wrapping performance of the concrete is enhanced, the construction difficulty is reduced, the construction efficiency is improved, and the concrete is more suitable for high-grade concrete.

The purpose of the invention is realized by the following technical scheme:

a high water-reducing water reducer for concrete comprises the following components in parts by mass:

adding 3000-3800 parts of water, 3000-3250 parts of allyl polyoxyethylene ether, 13-15 parts of potassium permanganate solution with the mass percentage concentration of 2.5%, 25-27 parts of hydrogen peroxide with the mass percentage concentration of 27.5%, 1892-1904 parts of mixed solution, 45-60 parts of sodium hydroxide and 1600-1700 parts of water;

the front water adding part and the rear water adding part are both clear water;

the mixed liquid comprises 7-8 parts of vitamin C, 20-21 parts of chain transfer agent, 420 parts of acrylic acid 410-420 parts and 1455 parts of water.

Further, the formula comprises the following components in parts by mass: 3560 parts of water, 3150 parts of allyl polyoxyethylene ether, 13-15 parts of 2.5% by mass potassium permanganate solution, 25-27 parts of 27.5% by mass hydrogen peroxide, 1892 and 1904 parts of mixed solution, 45-60 parts of sodium hydroxide and 1650 parts of post-added water;

the front water adding part and the rear water adding part are both clear water;

the mixed liquid comprises 7-8 parts of vitamin C, 20-21 parts of chain transfer agent, 420 parts of acrylic acid 410-420 parts and 1455 parts of water.

Further, the formula comprises the following components in parts by mass: 3560 parts of water, 3150 parts of allyl polyoxyethylene ether, 14 parts of 2.5% potassium permanganate solution, 25-27 parts of 27.5% hydrogen peroxide solution, 1898 parts of mixed solution, 55 parts of sodium hydroxide and 1650 parts of post-added water are added in the first step;

the front water adding part and the rear water adding part are both clear water;

the mixed liquid comprises 7-8 parts of vitamin C, 20-21 parts of chain transfer agent, 420 parts of acrylic acid 410-420 parts and 1455 parts of water.

Further, the sodium hydroxide may be 300 parts of a 20% sodium hydroxide solution 225-.

The preparation method of the high water reducing agent for concrete comprises the following steps,

s1, adding water into the reaction tank, adding allyl polyoxyethylene ether into the reaction tank, and continuing stirring for 10-20 minutes after the addition is finished;

s2, sequentially adding the potassium permanganate solution and hydrogen peroxide into the reaction tank, and continuing to stir for 10-15 minutes after the addition is finished;

s3, adding the mixed solution into a reaction tank, and continuing stirring for 30-40 minutes after the addition is finished;

s4, adding the sodium hydroxide solution into the reaction tank, and continuing stirring for 10-15 minutes after the addition is finished;

and S5, adding water into the reaction tank, and continuing stirring for 15-20 minutes after the water is added.

Furthermore, the temperature of the water added before the water is added into the reaction tank is 10-50 ℃.

Furthermore, the reaction tank is always in a stirring state in the whole preparation process, and the stirring speed is kept at 55-75 r/min.

Further, in step S3, the mixed solution is added dropwise into the reaction tank.

Further, the dropping time of the mixed solution is 175-185 minutes.

Further, the temperature in the reaction tank is kept at 25-35 ℃ in the whole preparation process.

Due to the adoption of the technical scheme, the invention has the following advantages:

according to the invention, through the use of the mixed liquid (vitamin C, chain transfer agent, acrylic acid) and hydrogen peroxide, the space structure of molecules and the lengths of branched chains and side chains thereof are controlled, so that the length ratio of all branched chains in the collapse preventing agent is in a certain range (a long chain is less, a short chain is more), better water reducing is realized, the highest water reducing rate can reach 50%, and meanwhile, the wrapping property of concrete is also improved. The water reducing agent prepared by the invention has high water reducing rate and is very suitable for high-grade concrete.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Detailed Description

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