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Reduction-reducing crack-resisting concrete superplasticizer of graft copolymer and method for preparing the same

A technology of graft copolymer and superplasticizer, which is applied in the field of concrete structure, concrete engineering and concrete admixture, and can solve the problems of insufficient water reducing rate, poor cement dispersion performance and high price

Active Publication Date: 2009-08-12
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] To sum up, there are still obvious deficiencies in multifunctional admixtures. These products basically use α-allyl alcohol ω-methyl polyether as the main raw material, and the price is relatively high. At the same time, α-allyl alcohol Alcohol omega-methyl polyether-maleic anhydride copolymer has poor dispersibility to cement and insufficient water reducing rate

Method used

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  • Reduction-reducing crack-resisting concrete superplasticizer of graft copolymer and method for preparing the same
  • Reduction-reducing crack-resisting concrete superplasticizer of graft copolymer and method for preparing the same
  • Reduction-reducing crack-resisting concrete superplasticizer of graft copolymer and method for preparing the same

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Experimental program
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Effect test

Embodiment 1

[0080] In the 2000ml glass reactor equipped with thermometer, stirrer, dropping funnel, nitrogen inlet tube and reflux condenser, add 600ml ethyl acetate, purging reaction vessel with nitrogen while stirring, and be warming up to 75 ℃. Then 1.0 mol of monomer A-1, 0.35 mol of monomer B-1 (n=9) and 0.2 mol of monomer C-1 (p=2, q=2, M 2 =H), 0.15mol monomer D-1 (m=12) and 0.05mol styrene, 0.027mol azobisisobutyronitrile (AIBN), 8.5g mercaptopropionic acid, also add 200ml ethyl acetate simultaneously, and stir Prepare a uniform monomer aqueous solution, add it dropwise to the reactor, the dropping time is 3h, keep warm for 4h after the dropwise addition, and then heat up to recover the ethyl acetate organic solution, which can be used multiple times, add water to dilute and cool, and add alkali Neutralize to pH 7.5 to obtain a brown transparent liquid with a solid content of 30.7% and a molecular weight of 42,000.

Embodiment 2

[0082] In the 2000ml glass reactor equipped with thermometer, stirrer, dropping funnel, nitrogen inlet tube and reflux condenser, add 600ml ethyl acetate, purging reaction vessel with nitrogen while stirring, and be warming up to 75 ℃. Then 1.0 mol of monomer A-1, 0.20 mol of monomer B-2 (n=17) and 0.15 mol of monomer C-3 (p=4, q=0, M 2 =H) and 0.15mol monomer D-1 (m=12), 0.040mol azobisisobutyronitrile (AIBN), 10.2g mercaptopropionic acid, also add 200ml ethyl acetate simultaneously, and stir to make uniform mono Aqueous aqueous solution, drop it into the reactor, dropwise time is 5h, heat preservation reaction for 3h after dropwise addition, then heat up to recover ethyl acetate organic solution, can be used multiple times, add water to dilute and cool, and add alkali to neutralize to pH value 7.5, the solid content is 30.2% brown transparent liquid, the molecular weight is 29,000.

Embodiment 3

[0084] In the 2000ml glass reactor equipped with thermometer, stirrer, dropping funnel, nitrogen inlet tube and reflux condenser, add 800ml ethyl acetate, purging reaction vessel with nitrogen while stirring, and be warming up to 75 ℃. Then 1.0 mol of monomer A-1, 0.45 mol of monomer B-3 (n=5) and 0.25 mol of monomer C-2 (p=0, q=2, M 2 =H) and 0.20mol of monomer D-2 (m=6), and 0.05mol of styrene, 0.05mol of azobisisobutyronitrile (AIBN), 3.0g of mercaptopropionic acid, while also adding 400ml of ethyl acetate, and Stir to make a homogeneous monomer aqueous solution, add it dropwise to the reactor, the dropwise addition time is 4h, keep warm for 4h after the dropwise addition, then heat up to recover the ethyl acetate organic solution, which can be used multiple times, add water to cool, and add alkali Neutralized to pH 7.5, solid content 30.2% brown transparent liquid, molecular weight 35,000.

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Abstract

A shrinkage-reducing, crack-resistant graft copolymer concrete superplasticizer consists of monomer A: acrylic acid or its salt, monomer B: alkoxy polyether monoacrylate, monomer C: maleic anhydride half ester or its Salt, monomer D: α-allyl alcohol ω-methyl polyether and monomer E: styrene are prepared by free radical copolymerization, the aforementioned monomer A: monomer B: monomer C: monomer D: The molar ratio of the monomer E is 1:0.2-0.5:0.10-0.25:0.10-0.20:0-0.10. Its preparation method includes 1) preparing monomer B by esterification reaction of monoalkoxy polyether and acrylic acid in the presence of water-carrying agent, acid catalyst and polymerization inhibitor; Polyether and maleic anhydride undergo esterification reaction under the condition of catalyst to prepare monomer C; 3) carry out free radical copolymerization reaction of each monomer under the condition of free radical initiator to obtain finished product. The invention has the advantages of simple production technology, high water reducing rate, good reinforcing effect, low drying shrinkage rate, good crack resistance and low price.

Description

technical field [0001] The invention belongs to the technical field of concrete structures and concrete engineering, in particular to the technical field of concrete admixtures, in particular to a preparation method and application of a shrinkage-reducing and crack-resistant polycarboxylate concrete superplasticizer. Background technique [0002] Concrete has developed into the most important structural engineering material in the contemporary era. In 2005, my country's annual cement output exceeded 1 billion tons. The amount of cement and concrete consumed by its infrastructure construction is in the leading position in the world. The production of cement not only consumes a lot of mineral resources and energy, and produces a large amount of CO 2 , emitting a large amount of dust. The sustainable development of the building materials industry is to reduce resources and energy consumption as much as possible in the use of raw materials and the production process of materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/24C04B103/32
Inventor 缪昌文冉千平刘加平周静
Owner JIANGSU SOBUTE NEW MATERIALS
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