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Multifunctional dry-mixed mortar additive and preparation method thereof

A dry-mixed mortar and admixture technology, which is applied in the fields of high molecular polymers and building materials, can solve the problems of product quality fluctuation, difficulty in homogenization of the mixture, and complicated dry-mixed mortar equipment, so as to simplify the production equipment and improve the dispersion performance. Effect

Inactive Publication Date: 2012-06-27
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main problem is that the current situation of multi-variety and low-volume admixtures makes dry-mixed mortar equipment more complex; due to the different densities of various admixtures, it is difficult to make the mixture of dry-mixed mortar products homogeneous, resulting in fluctuations in product quality ; Admixtures with different functions generally have problems of compatibility and adaptability to cement

Method used

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  • Multifunctional dry-mixed mortar additive and preparation method thereof
  • Multifunctional dry-mixed mortar additive and preparation method thereof
  • Multifunctional dry-mixed mortar additive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Step 1: Put 198g of methacrylic acid in the container and place it in a cold water bath, neutralize it with 10% sodium carbonate solution until the pH is close to 7. After the neutralization reaction is completed, add 402g of 2-acrylamide-2-methylpropylsulfonic acid into the container, mix and stir for later use.

[0017] The second step: weigh 100g of carboxymethylcellulose and put it into a reaction vessel with a stirrer, a nitrogen conduit and a thermometer, and add 400g of deionized water. In a constant temperature water bath, pass nitrogen to drive oxygen, heat and stir to completely dissolve carboxymethyl cellulose.

[0018] Step 3: In the dissolved carboxymethyl cellulose solution, add the neutralized mixed solution of methacrylic acid and 2-acrylamide-2-methylpropylsulfonic acid, stir and heat up to 70°C, 1.5 g of initiator ammonium persulfate was added, and the polymerization reaction was stirred for 10 hours while insulated and cooled to room temperature.

...

Embodiment 2

[0025] Step 1: Put 118g of methacrylic acid in the container and place it in a cold water bath, neutralize it with 10% sodium carbonate solution until the pH is close to 7. After the neutralization reaction is completed, add 682g of 2-acrylamide-2-methylpropylsulfonic acid into the container, mix and stir for later use.

[0026] The second step: weigh 100g of carboxymethylcellulose and put it into a reaction vessel with a stirrer, a nitrogen conduit and a thermometer, and add 600g of deionized water. In a constant temperature water bath, pass nitrogen to drive oxygen, heat and stir to completely dissolve carboxymethyl cellulose.

[0027] Step 3: Add the neutralized methacrylic acid and 2-acrylamide-2-methylpropylsulfonic acid mixture into the dissolved carboxymethyl cellulose solution, stir and heat up to 75°C, Add 2.0 g of initiator ammonium persulfate, insulate and stir the polymerization reaction for 12 hours, and cool to room temperature.

[0028] Step 4: Add ethanol to ...

Embodiment 3

[0035] The first step: put 104g of methacrylic acid in the container and place it in a cold water bath, neutralize it with 10% sodium carbonate solution until the pH is close to 7. After the neutralization reaction is completed, add 846g of 2-acrylamide-2-methylpropylsulfonic acid into the container, mix and stir for later use.

[0036] Step 2: Weigh 100 g of carboxymethyl cellulose and put it into a reaction vessel with a stirrer, a nitrogen conduit and a thermometer, and add 1000 g of deionized water. In a constant temperature water bath, pass nitrogen to drive oxygen, heat and stir to completely dissolve carboxymethyl cellulose.

[0037] Step 3: Add the neutralized methacrylic acid and 2-acrylamide-2-methylpropylsulfonic acid mixture into the dissolved carboxymethyl cellulose solution, stir and heat up to 75°C, 2.5 g of initiator ammonium persulfate was added, and the polymerization reaction was stirred for 12 hours while insulated and cooled to room temperature.

[0038]...

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Abstract

The invention relates to a multifunctional dry-mixed mortar additive and a preparation method thereof. According to the invention, carboxymethyl cellulose is adopted as a raw material; methacrylic acid and 2-acrylamide-2-methylpropyl sulfonic acid are adopted as grafting monomers; ammonium persulfate is adopted as an initiator; and the multifunctional additive is synthesized by copolymerization. The additive has a number average molar weight of 15,000-23,000, and is white or light yellow solid powder. The multifunctional dry-mixed mortar additive is used for preparing various dry-mixed mortars, and provides thickening, water-retaining, water-reducing, dispersing and air entraining functions in dry-mixed mortar. With the additive, comprehensive performance of a mortar hardenite is greatly improved. In a dry-mixed mortar production field, defects such as poor compatibility and poor adaptability caused by using a plurality of single-functional additives are avoided, and production equipment can be simplified.

Description

technical field [0001] The invention relates to a multifunctional admixture and a preparation method thereof, and its application in dry-mixed mortar, belonging to the field of high molecular polymers and building materials. Background technique [0002] Dry-mixed mortar is a solid mixture formed by mixing dry and screened fine aggregates with cementitious materials, mineral admixtures and chemical admixtures in a certain proportion. use. Water-retaining thickener, redispersible rubber powder, water reducer, etc. are the most important chemical admixtures of dry-mixed mortar, although their total content in dry-mixed mortar is mostly controlled within the range of 0.01% to 5%, but They have an important influence on various properties of mortar during mixing and construction and after hardening. In dry-mixed mortar, the commonly used water-retaining thickening material is cellulose ether, whose main function is to adjust the rheological properties of dry-mixed mortar, make...

Claims

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Application Information

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IPC IPC(8): C04B24/16C08F251/02
CPCC04B28/02C04B2103/0059C04B24/383C04B40/0608
Inventor 刘士荣龚雁倪忠斌陈明清毛明富
Owner JIANGNAN UNIV
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