Carboxylic acids graft copolymer concrete strengthening agent

A graft copolymer and concrete technology, applied in the field of carboxylic acid graft copolymer, can solve the problems of unfavorable sustainable development, heavy environmental pollution and high price

Active Publication Date: 2005-09-14
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although reactive polymers are very effective in solving the problem of concrete slump, they also have fatal shortcomings. Its storage stability is poor, and its plastic retention effect decreases with the prolongation of storage time. Synthesized in a solvent, which is very polluting to the environment and is not conducive to sustainable development
[0009] At present, the new type of carboxylic acid graft copolymer superplasticizer has become a worldwide research hotspot due to its good dispersibility, strong slump retention ability, and many variable factors in molecular structu

Method used

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  • Carboxylic acids graft copolymer concrete strengthening agent
  • Carboxylic acids graft copolymer concrete strengthening agent
  • Carboxylic acids graft copolymer concrete strengthening agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] a) Grafting reaction

[0070] 240g (0.2mol) polyethylene glycol-propylene glycol random copolymer (EO / PO=60:40, M w 1200), stirring and heating up to 60°C, adding 98g (1.0mol) of maleic anhydride, and adding 12g of p-toluenesulfonic acid, while stirring to form a uniform solution, then raising the temperature to 145°C for grafting reaction, and maintaining the reaction for 3 hours to obtain Sheath red transparent liquid.

[0071] b) Free radical polymerization

[0072] Then add a certain amount of distilled water and a little catalyst to the highly viscous reaction mixture, lower the temperature to 80-95°C, and simultaneously titrate the monomer solution (containing 30.5g acrylamide) and the composite initiator solution (K 2 S 2 o 8 +30%H 2 o 2 ), 90min dripping, and heat preservation reaction 3h, naturally cooled to below 40 ℃ and added alkali to obtain bright brown red transparent solution, its pH value is 7.8 (solid content 38.5%), weight average molecular weig...

Embodiment 2

[0074] a) Grafting reaction

[0075] According to the procedure described in production example 1, drop into 200g (0.2mol) polypropylene glycol (average molecular weight is 1000), 37.5g (0.05mol) polyethylene glycol monomethyl ether (average molecular weight is 750) stir and heat up to 60 ℃, add 65g (0.5mol) of itaconic acid, and 11g of p-toluenesulfonic acid was added to heat up, while stirring to form a uniform solution, then the temperature was raised to 145°C for grafting reaction, and the reaction was kept for 5 hours to obtain a red transparent liquid.

[0076] b) Free radical polymerization

[0077] Then add a certain amount of distilled water and a little catalyst to the highly viscous reaction mixture, lower the temperature to 80-95°C, and simultaneously titrate the monomer solution (containing 19.2g acrylic acid) and the composite initiator solution (K 2 S 2 o 8 +30%H 2 o 2 ), 120min dripping, and insulation reaction 3h, natural cooling to below 40 ℃, add alkali...

Embodiment 3

[0079] a) Grafting reaction

[0080] Consistent with that described in Production Example 2, but itaconic acid becomes 0.5mol maleic acid, and other materials and reaction conditions remain unchanged.

[0081] b) Free radical polymerization

[0082] Then add a certain amount of distilled water and a little catalyst to the highly viscous reaction mixture, lower the temperature to 80-95°C, and simultaneously titrate the monomer solution (containing 51.5g sodium p-styrene sulfonate) and the ammonium persulfate initiator solution , 90min dripping, and heat preservation reaction 3h, natural cooling to below 40 ℃, add alkali and obtain bright brown red transparent solution, its pH value is 8.5 (solid content 37.8%), weight average molecular weight is 37400.

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Abstract

This invention is a carboxylic acids graft copolymer concrete bao tan agent. The procedures are that 1) single alkyl polyether or double hydroxy group polyether and their compound said by general formula (1) is grafting reacted to generate big monomer a with C=C with dyadic unsaturated carboxylic acid or anhydride in condition of acid catalyst. 2) Compound an and monomer b is compounded copolymerized with weight ratio is 70-90% and 3-30%. This invention can greatly improve the slump constant loss of traditional naphthalene system water reducing agent, and improve its dispersibility at the same time. Coagulation time of concrete doesní»t prolong, it has good plastic keeping effect to medium and low slump constant concrete or big degree of fluidity concrete. It has good adaptability to other high efficiency water reducing agent. Good degree of fluidity keeping ability is on it whether coordinated with traditional naphthalene system water reducing agent or melamine system water reducing agent or new style polyocarboxy acid system dispersibility. There is no three wastes during its procedure.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, and in particular relates to a carboxylic acid graft copolymer that can be used as a high-efficiency slump-retaining agent for concrete. Background technique [0002] With the development of transportation, hydropower, municipal and other construction projects, the gradual rise of high-span bridges, hundreds of stories of high-rise buildings, and oil drilling platforms, offshore airports, offshore cities, and submarine tunnels, the construction performance and strength of concrete The requirements for indicators and durability are getting higher and higher, and almost all of them require the use of pumped concrete, and high-efficiency water reducers are the fifth component that is indispensable for the preparation of pumped concrete. Pumping concrete requires long-distance transportation and construction under high temperature conditions, which will inevitably le...

Claims

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Application Information

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IPC IPC(8): C04B24/24C08F290/00
Inventor 冉千平刘加平缪昌文张月星田倩周伟玲
Owner JIANGSU SOBUTE NEW MATERIALS
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