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 high water-reducing concrete superplasticizer and amphoteric carboxylic acid comb-shaped graft copolymer concrete superplasticizer, which can solve the problem of insufficient retention of dispersibility Good, can not meet the development of high-strength high-performance concrete with low water-binder ratio, and it is difficult to further improve the water-reducing performance

Active Publication Date: 2005-09-28
BOTE NEW MATERIALS TAIZHOU JIANGYAN CO LTD +1
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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
Comparison scheme
Effect test

Embodiment 1

[0083] Production Example 1 (synthesis of PCE-1)

[0084] In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, a nitrogen inlet tube and a reflux condenser, add 200ml of deionized water, while stirring, purging the reaction vessel with nitrogen, and raising the temperature to 95°C, then 40g (A1) is mixed with 160g (B2) and 200 parts of water to make a mixed monomer aqueous solution, which is added dropwise to the reactor for 2 hours, and 80 parts of the initiator solution containing sodium persulfate is added dropwise at the same time. Adding time is about 4 hours. After the dropwise addition, keep warm for 2 hours, then add 20 parts of hydrogen peroxide initiator solution containing 35% concentration to the reaction bottle, keep warm for 2 hours, and cool to room temperature to obtain a brown color with a solid content of 30.2%. Transparent liquid with a pH of 3.5 and a molecular weight of 15,800 (PCE-1), the results are shown in Table 4.

Embodiment 2-9

[0085] Production Example 2-9 (Synthesis of PCE-2-9)

[0086] The PCE-2-9 of the present invention was prepared according to the steps of Example 1, but the specific monomer weight and type were changed, and the feeding was carried out according to the ratio described in Table 4. The test results are shown in Table 4.

[0087]

Embodiment 10

[0088] Production Example 10 (Synthesis of HP-1)

[0089] At room temperature, 58.8 parts by weight concentration of 8.5% soluble CNP-1 solution (Table 3) was added to 314.6 parts by weight concentration of 30.2% PCE-1 (Table 2), and the reaction was stirred at room temperature, and the viscosity began to increase. After stirring for 1 h, Add 1.5g of cross-linking agent F-1, stir at room temperature for 1 hour, the polymer solution becomes uniform, adjust the pH to 7.5 with 30% sodium hydroxide solution, and dilute with water to a concentration of slightly 20%, the copolymer is abbreviated as HP-1 (shown in Table 5).

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Abstract

The amphoteric carboxylic acid comb grafted copolymer as concrete super-plasticizing agent is prepared through the following steps: 1) copolymerizing three kinds of monomers in certain proportion in water soluble medium to obtain intermediate product PCE; 2) preparing cationic copolymer CNP through Hofmann degradation or Mannich reaction of polyacrylamide or the copolymerization of acrylamide monomer and two other kinds of monomer in water soluble medium; 3) mixing the copolymer PCE and polymer CNP through stirring to obtain amphoteric carboxylic acid grafted copolymer; and 4 ) heating the comb grafted copolymer produced in the last step to 60-100 deg.c and adding crosslinking agent to produce crosslinking reaction producing the amphoteric carboxylic acid comb grafted copolymer. The concrete super-plasticizing agent of the present invention can reduce the water consumption of concrete greatly, and has excellent construction performance.

Description

technical field [0001] The invention relates to a high water-reducing concrete superplasticizer for cement, concrete and mortar, in particular to an amphoteric carboxylic acid comb-shaped graft copolymer concrete superplasticizer, which belongs to the concrete superplasticizer used in building materials. field of agent technology. 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 use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/04C04B24/24C04B24/26
Inventor 冉千平缪昌文刘加平张月星周静周伟玲
Owner BOTE NEW MATERIALS TAIZHOU JIANGYAN CO LTD
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