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Reduced-type polycarboxylic acid water reducer and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of polycarboxylate water reducer for cement concrete, can solve the problem of high cost, and achieve the effects of low cost, simple and easy control of the process, good market competitiveness and application prospects

Inactive Publication Date: 2018-06-15
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But diethylene glycol monobutyl ether is less on the market, and the cost is higher

Method used

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  • Reduced-type polycarboxylic acid water reducer and preparation method thereof
  • Reduced-type polycarboxylic acid water reducer and preparation method thereof
  • Reduced-type polycarboxylic acid water reducer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] First, 16.2g of diethylene glycol monobutyl ether was added to the reactor, the temperature was raised to 55°C, 29.4g of maleic anhydride and 3.192g of p-toluenesulfonic acid were added in sequence, and the interval between each addition was 20 minutes, and the temperature continued to rise Add 13.68g of cyclohexane at a temperature as high as 110°C, continue to heat up to 130°C for esterification reaction, and separate the water obtained during the reaction. After 5 hours of reaction, vacuumize and remove the water-carrying agent to obtain the esterification product; Add 6.05g of the esterified product into the reactor, add 184.22g of water, raise the temperature to 65°C and stir for 10 minutes until it is evenly mixed, then add 225g of prenyl alcohol polyoxyethylene ether, isopentenol The molecular weight of polyoxyethylene ether is 3000, 5.85g of sodium methacrylic sulfonate, 9.8g of maleic anhydride and 10.8g of acrylic acid, and 21.375g of 20% mass fraction of initi...

Embodiment 2

[0039] First, 19g of dipropylene glycol monobutyl ether is added to the reactor, the temperature is raised to 60°C, 39.2g of maleic anhydride and 2.91g of phosphoric acid are successively added into the reactor, and the interval between each feeding is 15 minutes, and the temperature continues to rise to After 85°C 17.6 g of benzene were added. Continue to raise the temperature to 120°C to carry out the esterification reaction. During the reaction, the water obtained in the reaction is separated out. After 7 hours of reaction, the water-carrying agent is removed by vacuuming to obtain the esterification product; 4.84 g of the esterification product is added to the reactor, and then Add 100g of water, raise the temperature to 50°C and stir for 20 minutes until it is evenly mixed, then add 240g of prenol polyoxyethylene ether, prenyl polyoxyethylene ether molecular weight of 1500, 3.64g of thioglycolic acid, 3.92g of maleic anhydride, 15.6g of itaconic acid, and 8.1g of 10% init...

Embodiment 3

[0041] First, 26.8g of diethylene glycol ethyl ether was added to the reactor, the temperature was raised to 45°C, and 0.288g of hydroquinone, 28.8g of acrylic acid, and 2.23g of sulfamic acid were added in sequence, and each feeding interval was 10 minutes. After raising the temperature to 65°C, 22.24 g of toluene were added. Continue to raise the temperature to 115°C to carry out the esterification reaction. During the reaction, the water obtained in the reaction is separated out. After 4 hours of reaction, the water-carrying agent is removed by vacuuming to obtain the esterification product; 4.7g of the esterification product is added to the reactor , add 100g of water into the reactor, raise the temperature to 45°C and stir for 30 minutes until it is evenly mixed, then add 240g of allyl polyoxyethylene ether to the reactor in turn, the molecular weight of allyl polyoxyethylene ether used is 2400, 4.04 g n-dodecyl alcohol, 20.3g fumaric acid, and 31.73g mass fraction are 15...

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Abstract

The invention relates to a reduced-type polycarboxylic acid water reducer and a preparation method thereof. An esterification method is employed for synthesizing a reduced monomer having a low surfacetension, and the reduced polycarboxylic acid water reducer is prepared through polymerization; acid anhydride or unsaturated carboxylic acid and ethers molecules are subjected to an esterification reaction to prepare the reduced monomer under effect of a catalyst, and then the reduced monomer, nonsaturated polyoxyethylene ether, unsaturated carboxylic acid or a mixture of unsaturated carboxylic acid or its acid anhydride, and a molecular weight conditioning agent are subjected to a free radical copolymerization reaction under effect of an initiator. The method has the advantages of easy control, high yield, low cost, environmental protection, and no pollution. During a polymerization process, a reduced group is introduced, so that the water reducer has low surface tension, an anchoring group is introduced, has good cement slurry-cleaning fluidity under common doping, reduces the surface tension force of a cement aperture solution, and reduces evaporation rate of the solution so as toeffectively reduce the mortar contraction. The obtained water reducer presents good water-reducing and reduction characteristic.

Description

technical field [0001] The invention relates to the technical field of a polycarboxylate water reducer for cement concrete, in particular to a shrinkage-reducing polycarboxylic acid synthesized by esterification of a small molecule ether and an unsaturated carboxylic acid monomer to generate a shrinkage-reducing functional group and then polymerizing The specific preparation method of water reducing agent. Background technique [0002] In recent years, with the rapid development of the construction industry and the continuous improvement of the design level, new technologies such as large formwork, slip form, pumped concrete, vacuum-absorbed concrete, and shotcrete have emerged in the field of construction; Commercial concrete, concentrated mixing and other methods have been introduced; high-rise, super high-rise, long-span, folded plate, thin shell, frame light plate system, shear wall system, assembly structure, box structure, unbonded prestressed structure have appeared i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F222/24C08F228/02C08F222/06C08F220/06C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/065C08F222/24
Inventor 毛倩瑾马建峰王子明梁鹏伍文文崔素萍
Owner BEIJING UNIV OF TECH
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