Defoaming agent and application thereof in preparation of modified cassava starch-polycarboxylic acid composite water reducing agent

A composite water reducing agent, tapioca starch technology, applied in the field of building materials, can solve the problems of toxicity, non-biodegradability, discharge of large toxic waste liquid, etc.

Inactive Publication Date: 2020-07-07
NANNING TONGCAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can also solve the technical problems that the existing water reducer products are toxic, non-biodegradable, and discharge a large amount of toxic waste liquid during the production process, making it difficult to meet the requirements of green and environmental protection.

Method used

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  • Defoaming agent and application thereof in preparation of modified cassava starch-polycarboxylic acid composite water reducing agent

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preparation example Construction

[0032] The preparation method of described defoamer, comprises the following steps:

[0033] S1: Mix hydrogen silicone oil and polyether silicone oil in the first reaction kettle, stir for 10 minutes until fully mixed, then add sulfuric acid with a mass concentration of 3% of the total mass of the mixed solution, and react at 12Mpa pressure and 60°C for 4-9h Obtain mixed solution A;

[0034] S2: Add the mixed solution A into the second reaction kettle, when heated to 85°C, add polyoxyethylene polyoxypropylene pentaerythritol ether, when the temperature rises to 130°C, add octamethylcyclotetrasiloxane, when the temperature rises When the temperature reaches 155°C, stop heating, and take out material B after reacting for 2-6 hours;

[0035] S3: put material B into a starch colloid mill with 60% of the total mass of material B and grind for 1.5 hours, then stir for 40 minutes to obtain material C;

[0036]S4: Add the high-carbon alcohol fatty acid ester compound and polyoxyprop...

Embodiment 1

[0049] A defoamer, comprising the following components in parts by weight: 30 parts of hydrogen silicone oil, 40 parts of high-carbon alcohol fatty acid ester complex, 17 parts of polyoxyethylene polyoxypropylene pentaerythritol ether, octamethylcyclotetrasiloxane 10 parts of alkane, 5 parts of polyether silicone oil and 3 parts of polyoxypropylene polyoxyethylene glyceryl ether.

[0050] The preparation method of described defoamer, comprises the following steps:

[0051] S1: Mix hydrogen silicone oil and polyether silicone oil in the first reaction kettle, stir for 10 minutes until fully mixed, then add sulfuric acid with a mass concentration of 2% of the total mass of the mixed solution, and react at 12Mpa pressure and 60°C for 4 hours to obtain Mixture A;

[0052] S2: Add the mixed liquid A into the second reaction kettle, when heated to 85°C, add polyoxyethylene polyoxypropylene pentaerythritol ether and stir, when the temperature rises to 130°C, add octamethylcyclotetra...

Embodiment 2

[0065] A defoamer, comprising the following components in parts by weight: 50 parts of hydrogen silicone oil, 28 parts of high-carbon alcohol fatty acid ester complex, 14 parts of polyoxyethylene polyoxypropylene pentaerythritol ether, octamethylcyclotetrasiloxane 12 parts of alkane, 6.5 parts of polyether silicone oil and 4.5 parts of polyoxypropylene polyoxyethylene glyceryl ether.

[0066] The preparation method of described defoamer, comprises the following steps:

[0067] S1: Mix hydrogen silicone oil and polyether silicone oil in the first reaction kettle, stir for 10 minutes until fully mixed, then add sulfuric acid with a mass concentration of 2% of the total mass of the mixed solution, and react at 12Mpa pressure and 60°C for 9 hours to obtain a mixture Liquid A;

[0068] S2: Add the mixed solution A into the second reaction kettle, when heated to 85°C, add polyoxyethylene polyoxypropylene pentaerythritol ether, when the temperature rises to 130°C, add octamethylcycl...

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Abstract

The invention discloses a defoaming agent and application thereof in preparation of a modified cassava starch-polycarboxylic acid composite water reducing agent, and belongs to the field of building materials. The defoaming agent is prepared from the following components in parts by weight: 30 to 65 parts of hydrogen silicone oil, 20 to 40 parts of high-carbon alcohol fatty acid ester compound, 10to 17 parts of polyoxyethylene polyoxypropylene pentaerythritol ether, 10 to 15 parts of octamethylcyclotetrasiloxane, 5 to 9 parts of polyether silicone oil and 3 to 6 parts of polyoxypropylene polyoxyethylene glyceryl ether. The cassava starch is subjected to oxidation, acidification, etherification, grafting, neutralization and other reaction processes to prepare the starch-containing composite water reducing agent. The strength of concrete is reduced by harmful bubbles generated in the concrete, and the quality of the concrete is influenced; the defoaming agent is good in defoaming effect, the harmful bubbles in the concrete can be efficiently eliminated, and air holes influencing the performance are prevented from being formed. When the mixing amount of the water reducing agent is 1%, the initial fluidity of cement paste is larger than 200 mm, and the water reducing agent has a good water reducing effect.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a defoamer and its application in preparing a modified tapioca starch-polycarboxylic acid composite water reducer. Background technique [0002] Defoamers, also known as defoamers or defoamers, will produce many foams that affect production during industrial production, and defoamers need to be added. It is widely used to remove harmful foam produced in the production process of latex, textile sizing, food fermentation, biomedicine, paint, petrochemical, papermaking, industrial cleaning, sewage treatment and other industries. However, most of the existing commercially available defoamers have the problems of slow defoaming speed and poor defoaming effect. [0003] Water reducing agent is an essential and important component of ready-mixed concrete, and its consumption is increasing year by year with the acceleration of the urban process. In 2014, the output of cement in Guangx...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B24/38C04B103/50C04B103/30
CPCC04B24/38C04B40/0039C04B2103/302C04B2103/50C04B24/42C04B24/085C04B24/32
Inventor 班定志陈黔邹智秀潘婷婷
Owner NANNING TONGCAI TECH CO LTD
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