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Polycarboxylate copolymer, preparation method thereof and polycarboxylic acid water reducing agent containing polycarboxylate copolymer

A technology of polycarboxylate and copolymer, applied in the field of polycarboxylate copolymer and preparation method thereof, and polycarboxylate water reducer containing the same, can solve unmentioned application conditions, poor workability, slump In order to improve the adaptability and slump retention performance, improve the molecular adsorption capacity, and delay the hydration of cement

Pending Publication Date: 2022-06-17
LIAONING OXIRANCHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the large difference in concrete raw materials, when the weather is hot, high-grade cement or long-distance transportation, the concrete has problems such as excessive slump loss, high viscosity, difficult pumping, and poor workability, which make the fresh concrete unable to Normal pouring is a great waste of manpower and material resources, especially in recent years with high mud content in sand and gravel and the increase of recycled concrete. The existing polycarboxylate water reducer can no longer keep up with the pace of concrete technology development.
[0004] Patent CN109970926 A discloses a method for preparing polycarboxylic acid type high slump-retaining water-reducing agent by using ethylene glycol monovinyl polyoxyethylene ether at ultra-low temperature, but its slump-retaining effect is still relatively short, and it does not mention the use of high-grade cement, high For the application of mud content concrete and different ground materials, the present invention designs a polycarboxylate water reducer based on the action mechanism of the water reducer, which can solve the problems existing in the existing water reducer when applied in the above situation

Method used

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  • Polycarboxylate copolymer, preparation method thereof and polycarboxylic acid water reducing agent containing polycarboxylate copolymer
  • Polycarboxylate copolymer, preparation method thereof and polycarboxylic acid water reducing agent containing polycarboxylate copolymer
  • Polycarboxylate copolymer, preparation method thereof and polycarboxylic acid water reducing agent containing polycarboxylate copolymer

Examples

Experimental program
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Effect test

preparation example 1

[0131] The preparation method of the functional polyether monomer is as follows: adding methacrylic acid, hydroquinone and calcium acetate into the reactor, performing nitrogen replacement three times, stirring and heating up, and adding a small amount of butylene oxide when the temperature in the reactor reaches 80°C, When the reaction pressure drops, the remaining butylene oxide and ethylene oxide are added steadily again, keeping the pressure in the reactor at 0.3-0.5MPa, the reaction temperature at 80-120°C, and the butylene oxide and ethylene oxide. After all the additions were completed, it was kept for 0.5 hours, and then the temperature was lowered to room temperature to obtain a functional polyether macromonomer: methacrylic acid polyoxybutylene polyoxyethylene ether. The mass ratio of each material is methacrylic acid: butylene oxide: ethylene oxide: calcium acetate: hydroquinone=1:3.349:10.767:0.151:0.01. The hydroxyl value of the test product is: 44.1, the iodine v...

preparation example 2

[0133] The preparation method of functional small monomer is as follows:

[0134] (1) Add maleic anhydride, KOH and p-hydroxyphenol into a three-necked flask and heat up to 80-100°C, gradually add methanol dropwise in a ratio of 1:1, mature for 2-3h after the dropwise addition, and distill under reduced pressure at 80°C The unreacted methanol was discharged, and the substance in the three-necked flask was product C; the acid value of the test product C was 431.44, and the conversion rate of maleic anhydride was calculated: 100%.

[0135]

[0136] (2) Add product C, phenothiazine and potassium acetate into the reactor, carry out nitrogen replacement three times, stir and heat up, when the temperature in the reactor reaches 140 ° C, add a small amount of ethylene oxide, when the reaction pressure drops, the stable temperature again Add the remaining ethylene oxide, keep the pressure in the reactor at 0.3-0.5 MPa, and the reaction temperature at 140-180 ° C. After all the ethy...

Embodiment 1

[0138] (1) 340g of vinyl polyoxyethylene ether monomers with molecular weight of 3000 and 340g of deionized water are dropped into a four-necked flask, and the temperature is raised to 30°C for subsequent use;

[0139] (2) Prepare material a and mix it evenly. Material a consists of 0.997g vitamin C, 0.901g mercaptopropionic acid and 58.90g deionized water; prepare material b and mix it evenly. of functional polyether monomer and 38.40g deionized water;

[0140] (3) Add 2 g of hydrogen peroxide with a mass concentration of 28% to the four-necked flask at one time, and add 3.61 g of functional small monomers of Preparation Example 2 at one time;

[0141] (4) After stirring for 2-3 minutes, add material a and material a dropwise at the same time, material A (180±20) minutes, and material B (170±20) minutes;

[0142] (5) After the dropwise addition, the reaction was continued for (60±5) minutes.

[0143] (6) Finally, add 144.75 g of deionized water to the four-necked flask, and...

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Abstract

The invention relates to a polycarboxylate copolymer, a preparation method thereof and a polycarboxylate superplasticizer containing the polycarboxylate copolymer. The polycarboxylic acid water reducing agent comprises the polycarboxylate copolymer, which is a copolymer of a polyether monomer, a functional polyether monomer, an acrylic monomer and a functional small monomer. The polycarboxylic acid water reducer has the excellent performances of wide adaptability, high slump loss resistance, viscosity reduction and the like, and the preparation method of the water reducer is simple and controllable.

Description

technical field [0001] The invention relates to a polycarboxylate copolymer, a preparation method thereof, and a polycarboxylate water-reducing agent comprising the same, in particular to a high-adaptability super-slump-preserving viscosity polycarboxylate water-reducing agent. Background technique [0002] Due to its unique comb structure, polycarboxylate superplasticizer has the advantages of high water reduction rate, low dosage, good workability, and green environmental protection. As an important raw material in concrete, it has become indispensable for national infrastructure construction. New materials, with the rapid development of my country's construction industry, the demand and performance requirements for polycarboxylate superplasticizers are increasing year by year. [0003] Due to the large differences in concrete raw materials, in hot weather, high-grade cement or long-distance transportation, concrete has problems such as excessive slump loss, high viscosity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/16C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06C08F222/16
Inventor 朱建民刘兆滨董振鹏刘枫赵春雨田威
Owner LIAONING OXIRANCHEM INC
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