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Amphoteric carboxylic acid comb grafted copolymer as concrete super-plasticizing agent

A technology of graft copolymer and amphoteric carboxylic acid, which is applied in the field of concrete admixtures in building materials, can solve the problems of unsatisfactory synthesis process, poor dispersion retention ability, high admixture high-strength concrete content, etc.

Active Publication Date: 2005-09-28
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, the preparation process of such copolymers described in US2002 / 0193547A1 and US6680348B1 patents is complicated, the operation is difficult to control, and the amount of admixture is relatively high when preparing high-strength concrete
[0013] Therefore, there are many problems about polycarboxylate superplasticizers at present. The synthesis process of these products is unsatisfactory, unclean and uneconomical, and its application performance is not completely satisfactory. Although some products have good Good dispersibility, but the dispersibility retention ability is not good, some products have a certain slump retention ability, but the dispersibility performance is not good
Moreover, the current polycarboxylate admixture product has a low saturation point, and the water reducing rate is difficult to reach more than 35%. Even if the dosage is increased, the water reducing performance is difficult to further improve, which cannot meet the needs of the development of low water-binder ratio, high strength and high performance concrete

Method used

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  • Amphoteric carboxylic acid comb grafted copolymer as concrete super-plasticizing agent
  • Amphoteric carboxylic acid comb grafted copolymer as concrete super-plasticizing agent
  • Amphoteric carboxylic acid comb grafted copolymer as concrete super-plasticizing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0072] Production Example 1 (Synthesis of SSP-1)

[0073]In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, a nitrogen gas inlet tube and a reflux condenser, add 150ml of deionized water, and purging the reaction vessel with nitrogen gas while stirring, and raise the temperature to 95°C, then add 24g (A1) and 164g (B1) and 12g (C-2), and 200 parts of water are mixed to make a mixed monomer aqueous solution, which is added dropwise to the reactor for 2 hours, and at the same time, 80 parts containing For the initiator solution of ammonium persulfate, the dropping time is about 5 hours. After the dropping is completed, the insulation reaction is 1 hour, and then 20 parts of hydrogen peroxide initiator solution containing 35% concentration are added to the reaction bottle, and the temperature is continued for 2 hours, and cooled to At room temperature, add 2.6g of cross-linking agent (F-1), stir for 1 hour, add alkali to neutralize to pH 7.5, solid cont...

Embodiment 2-10

[0074] Production Example 2-10 (Synthesis of SSP-2-10)

[0075] Prepare SSP-2-10 of the present invention according to the steps of Example 1, but the weight and type of specific monomers have changed, and feed intake according to the ratio described in Table 3, wherein the weight percentage of crosslinking agent (F) It is F / (A+B+C+D).

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Abstract

The amphoteric carboxylic acid comb grafted copolymer as concrete super-plasticizing agent is prepared through the following steps: 1) free radical copolymerizing reaction of four kinds of monomers in certain proportion in water soluble medium; 2) crosslinking reaction through introducing crosslinking agent after the polymerization. The present invention proposes that the amphoteric ionic polymer can raise the saturated added amount of concrete super-plasticizing agent, and introduces amphoteric ion concept into the molecular design of concrete admixture. The concrete super-plasticizing agent of the present invention has high water reducing rate, can eliminate the environmental pollution caused by concrete water reducing agent and reduce the added amount while ensuring the outstanding dispersivity and slump maintaining capacity.

Description

technical field [0001] The invention relates to a high water-reducing superplasticizer for cement, concrete and mortar, specifically an amphoteric carboxylic acid comb-shaped graft copolymerized concrete superplasticizer, which belongs to the concrete admixture technology in building materials field. Background technique [0002] Cement concrete is the most widely used building material in the world, but it has disadvantages such as heavy weight, low strength and brittleness. With the rapid development of the construction industry, new requirements have been put forward for various aspects of concrete, such as improving the strength of concrete and improving the slump loss of concrete during transportation. Adding admixtures, especially high-efficiency water reducers, to concrete is an effective, simple and economical method to reduce the water-binder ratio, increase concrete strength, and improve various properties of concrete. Currently used mainly include modified ligni...

Claims

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Application Information

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IPC IPC(8): C04B24/24C04B24/26
Inventor 冉千平缪昌文刘加平张月星周静周伟玲
Owner JIANGSU SOBUTE NEW MATERIALS
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