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Preparation method of grafted copolymer and air-entraining and slump-retaining polycarboxylate concrete water reducer

A technology of graft copolymers and carboxylic acids, which is applied in the field of preparation of graft copolymers and air-entrained slump-preserving polycarboxylate concrete water reducers, which can solve the problem of affecting the strength of concrete, not being stable enough, and having different sizes of bubbles and other problems, to achieve the effect of good pumpability, good cement adaptability, and low requirements for production equipment

Inactive Publication Date: 2015-06-24
山东天汇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In foreign countries, especially in Japan, air-entrained high-efficiency carboxylic acid superplasticizers have been widely used in concrete projects requiring high durability such as water conservancy and roads, but the air-entrained air bubbles are not stable enough to affect the strength of concrete.

Method used

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  • Preparation method of grafted copolymer and air-entraining and slump-retaining polycarboxylate concrete water reducer
  • Preparation method of grafted copolymer and air-entraining and slump-retaining polycarboxylate concrete water reducer
  • Preparation method of grafted copolymer and air-entraining and slump-retaining polycarboxylate concrete water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Add 300 g of polyethylene glycol with a molecular weight of 600 and 45.04 g of methacrylic acid into a reactor equipped with a condensing and splitting device, add 0.345 g of a polymerization inhibitor phenothiazine, 3.45 g of catalyst concentrated sulfuric acid, and 51.76 g of toluene, and stir. Raise the temperature to 110°C, react for 9 hours, and distill off the solvent by distillation under reduced pressure to obtain 348.83 g of the esterified product, which weighed 51.32 g after solvent recovery, and the solvent recovery rate was 99.15%; Sodium allyl sulfonate 47.445g and methacrylic acid 57.57g, obtain 453.845g monomer, add 543.58g water and be made into the monomer solution that concentration is 50%, account for the ammonium persulfate 0.544g of monomer gross weight 0.1% Add 21.22g of water to form an initiator solution with a concentration of 2.5%; add 1250.58g of water to the reactor, stir, heat up to 75°C, and simultaneously add the monomer solution and the in...

Embodiment 2

[0059] Put 200g of methoxypolyethylene glycol with a molecular weight of 600, 5.22g of p-toluenesulfonic acid, 0.72g of phenothiazine, 85g of acrylic acid, and 60g of toluene into a reaction vessel, stir and react at 115°C for 5 hours, and use a reduced pressure Distill the whole toluene out for recycling to obtain 290g of esterification product 1, reclaim 59g of toluene, and the solvent recovery rate is 98.33%; , 0.525g of hydroquinone, 35g of acrylic acid, and 150g of toluene were put into a reaction vessel, stirred and reacted at 115°C for 8 hours, and the toluene was removed by distillation under reduced pressure for recycling to obtain 587g of esterification product 2, which was recovered Toluene is 149g, and the solvent recovery rate is 99.33%; Getting esterification product 1 weight is 290g and esterification product 2 weight is that 105g is stirred and mixed in the same container, adds 700g water and is made into the monomer solution that concentration is 36.07%, takes ...

Embodiment 3

[0061] Molecular weight is 750 methoxypolyethylene glycol 375g and methyl methacrylate 150g join in the reactor that condensing diverter device is housed, add polymerization inhibitor phenothiazine 13.125g, catalyzer p-toluenesulfonic acid 52.5g, Solvent cyclohexane 131.25g, stirred, heated up to 82°C, reacted for 12 hours, distilled off the solvent by vacuum distillation and recovered to obtain 574.2g of esterified product, weighed 129g after solvent recovery, and the solvent recovery rate was 98.29% Adding 1000g water in the esterification product is made into the monomer solution that concentration is 36.48%, is made into the initiator solution that concentration is 2.46% with sodium persulfate 10.36g adding water 410g; Add water 960g in the reactor, stir, disposable Put in the monomer solution, and then raise the temperature to 85°C. The initiator solution is slowly added dropwise, and the dropwise addition is completed in 2 hours. Neutralize to PH=7.5 with 30% liquid caus...

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Abstract

The invention belongs to the technical field of concrete admixtures in chemical building materials, and particularly relates to a preparation method of a grafted copolymer and an air-entraining and slump-retaining polycarboxylate concrete water reducer. The air-entraining and slump-retaining polycarboxylate air-entrained concrete efficient water reducer is synthesized by the following steps: introducing a double bond in the process of preparing a macromonomer with reaction activity through utilization of polyoxyalkylene ether monomers; copolymerizing a product obtained from the former step and carboxylic acid monomers and allylsulfonate monomers in a solution so as to introduce a long side chain. The preparation technology is very simple; the reaction condition is easy to control; industrial three wastes are not generated in the production process; the solvent can be recycled after being recovered; and the solvent recovery rate reaches 98%-100%, so that the economic benefits are ensured; and the environmental pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in chemical building materials, and in particular relates to a preparation method of a graft copolymer and an air-entrained slump-preserving polycarboxylate concrete water reducer. Background technique [0002] With the rapid development of my country's economy, there are more and more large-scale construction projects. Concrete technology is constantly developing towards high strength, high durability, high workability or special performance. Admixtures have become one of the essential components of concrete. The superplasticizer is the most widely used concrete admixture. [0003] At present, the domestically used concrete water-reducing agents are mainly naphthalene-based water-reducing agents, which have the advantages of relatively mature production technology and application technology, high water-reducing rate, and low price. There are problems such as large loss over time and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F228/02C08F220/06C04B24/16C04B103/30
Inventor 王峰尹方勇周俊华
Owner 山东天汇科技有限公司
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