Low molecular weight copolymer dispersant and its preparing method

A low-molecular-weight, copolymer technology, applied in the chemical industry, can solve problems such as poor dispersion, complex production control, and cumbersome production, and achieve good dispersion retention performance, cheap and easy-to-obtain raw materials, and simple and easy operation.

Active Publication Date: 2009-07-08
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

EP1304314 is mainly controlled by controlling the dropping rate or feeding method of the monomer and initiator, which is a commonly used method at present, but this method maintains the ability. US5854318 and US5362324 adopt the technical approach of ester crosslinking. This ester crosslinking It is difficult to control the water in the body, the production is cumbersome, and the quality is difficult to guarantee
In order to improve the slump of the polycarboxylic acid admixture in the alkaline medium of mud, chain scission occurs and the molecular weight decreases, so it has good slump retention ability, but the dispersibility is not very good, and the production control is more complicated.
[0006] In summary, the current synthesis process for low molecular weight copolymer dispersants is unsatisfactory, unclean and uneconomical

Method used

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  • Low molecular weight copolymer dispersant and its preparing method
  • Low molecular weight copolymer dispersant and its preparing method
  • Low molecular weight copolymer dispersant and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In a 1L glass reactor equipped with a thermometer, a stirrer and a reflux condenser, add 400g of tap water, 90g (1.046mol) of methacrylic acid, 110g (0.846mol) of hydroxypropyl acrylate, and 35g (0.875mol) of sodium hydroxide in sequence , stirred into a homogeneous monomer aqueous solution, and heated up to 60 ° C, then 100 parts of an aqueous solution containing 4.5 g (0.0167 mol) of potassium persulfate was added to the reactor at one time, and the temperature in the reactor was observed to rise after 20 minutes. The solution becomes thicker, the stirring resistance increases, and finally the temperature naturally rises to 97°C, and is kept at this temperature for 2h, and 20 parts of an aqueous solution containing 1.0g (0.0037mol) of potassium persulfate is added, and kept warm for 1h, to obtain pH The value is 6.5, the solid content is 29.2% viscous liquid, and at 25°C, the polymer viscosity is 225mpa.s (P-1).

Embodiment 2

[0043] In a 1L glass reactor equipped with a thermometer, a stirrer and a reflux condenser, add 400g of tap water, 80g (1.111mol) of acrylic acid, 100g (0.767mol) of hydroxyethyl methacrylate, 20g (0.0965mol) of 2-propylene Amino-2-methylpropanesulfonic acid, 36g (0.90mol) sodium hydroxide, stirred into a uniform monomer aqueous solution, and heated to 50 ° C, and then 100 parts of the aqueous solution containing 18g (0.0789mol) ammonium persulfate once After 10 minutes, it is observed that the temperature in the reactor rises, the solution becomes thicker, and the stirring resistance increases. Finally, the temperature naturally rises to 95°C and is kept at this temperature for 2 hours. Add 20 parts containing 6.0 g (0.026mol) aqueous solution of ammonium persulfate, and continue to keep warm for 1h to obtain a viscous liquid with a pH value of 6.2 and a solid content of 30.1%. At 25°C, the viscosity of the polymer is 185mpa.s (P-2).

Embodiment 3

[0045] In a 1L glass reactor equipped with a thermometer, a stirrer and a reflux condenser, add 500g of tap water, 80g (0.93mol) of methacrylic acid, 90g (0.692mol) of hydroxypropyl acrylate, 10g (0.093mol) of ethylenesulfonic acid , 32g (0.80mol) sodium hydroxide, 54g (0.0874mol) methoxypolyethylene glycol methacrylate (general formula IV, n=12) were stirred into a uniform monomer aqueous solution, and the temperature was raised to 55°C, and then Add 100 parts of an aqueous solution containing 8g (0.0336mol) sodium persulfate into the reactor at one time. After 20 minutes, it is observed that the temperature in the reactor rises, the solution becomes thicker, the stirring resistance increases, and finally the temperature naturally rises to 98°C , and at this temperature for 2h, add 20 parts of an aqueous solution containing 2.0g (0.0084mol) sodium persulfate, and continue to insulate for 1h to obtain a pH value of 6.7, a viscous liquid with a solid content of 28.3%, at 25°C, ...

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Abstract

The invention relates to a low molecular weight copolymer dispersant and the preparing method thereof, adopting 40%-70mol% monomer a, 30-60mol% monomer b, 0-15mol% unit c and 0-10mol% monomer d, using water as reaction medium, one-off adding in water soluble initiator and monomer mixture, controlling initial reaction temperature and using a large amount of reaction heat produced in the self-accelerating course of polymerication reaction to fast polymerize the monomer mixture and making it. And it can directly act as dispersant for cement, superfine calcium carbonate, plaster, clay, ceramics and other organic powder, especially for cement-base materials, such as concrete, mortar and grout, having excellent dispersivity and good dispersion retention.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to the preparation and application of a low molecular weight (meth)acrylic acid copolymer. The product of the invention can be directly used as a dispersant for inorganic powders such as cement, superfine calcium carbonate, gypsum, clay and ceramics, especially as a dispersant for cement with excellent dispersion and dispersion retention performance. Background technique [0002] The dispersion of solid particles in the liquid phase is a common problem encountered in the field of basic research and industrial technology departments, almost in the fields of chemical industry, materials, food, medicine, coatings, inks, papermaking, construction and metallurgy. Dispersion has become an essential and very important technical means to improve product quality and performance and improve process efficiency. At present, chemical methods are used in many industrial sec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/28
Inventor 缪昌文刘加平冉千平周伟玲张建雄
Owner JIANGSU SOBUTE NEW MATERIALS
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