Amphiphilic polymer pigment wetting dispersant for water-based coating and preparation method thereof

An amphiphilic polymer and wetting and dispersing agent technology, which is used in the chemical coatings manufacturing industry and the field of pigment wetting and dispersing agents for water-based coatings, can solve the problems of high monomer purity requirements, limited application scope and harsh reaction conditions. Achieve low cost, improved performance, low viscosity

Inactive Publication Date: 2011-05-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional free radical polymerization cannot meet this requirement, while methods such as anionic and cationic polymerization h

Method used

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  • Amphiphilic polymer pigment wetting dispersant for water-based coating and preparation method thereof
  • Amphiphilic polymer pigment wetting dispersant for water-based coating and preparation method thereof
  • Amphiphilic polymer pigment wetting dispersant for water-based coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0037] (1) The preparation method of initiator is as follows:

[0038] In a 500mL round bottom flask, add 18.6g (0.3mol) ethylene glycol, 41.28g (0.2mol) N, N'-dicyclohexylcarbodiamide (DCC), 33.4g (0.2mol) 2-bromo isobutyric acid and 200 mL of dichloromethane. The solution was stirred, and 248 mg (2 mmol) of 4-dimethylaminopyridine was added in an ice-water bath, and reacted overnight at room temperature. The resulting reaction mixture was filtered to remove the precipitate and washed with 25 mL of dichloromethane. The solvent obtained was removed by a rotary evaporator, and the residue was crude hydroxyethyl dibromoisobutyrate. Purified by column chromatography, the eluent was petroleum ether / diethyl ether (4 / 1 to 2 / 3 v / v) mixture.1 H NMR (CDCl 3 ,): δ1.92(s, 6H), 2.39(s, 1H), 3.82(t, 2H), 4.28(t, 2H).

[0039] The reaction equation is:

[0040]

[0041] (2) The preparation method of TPMA is as follows:

[0042] In 75mL of dichloromethane, add 0.54g (5.26mmol) of 2-...

Embodiment 1

[0045] Put 3.5g ring-shaped copper wire and magnetic stirring bar into a 100mL Schlenk bottle, blow nitrogen, and vacuum three times (deoxygenation); 9.0g (70.2mmol) tert-butyl acrylate, CuBr 2 (3.63mg, 1.62×10 -2 mmol) and TPMA complex (57.8mg, 19.89×10 -2 mmol) was dissolved in 9mL anisole, deoxidized with high-purity nitrogen for 30min, then sealed with a syringe and transferred to a Schlenk bottle, and after magnetic stirring for 15min, added the initiator bromoisobutyrate hydroxyethyl ( 520mg, 198.9×10 -2 mmol) in anisole solution (1 mL), in an oil bath at 80° C. under a nitrogen atmosphere, and reacted for 9 h. The resulting solution was precipitated in methanol and water mixture (volume ratio 1:3) and dried to obtain a pale yellow solid macromolecular precursor with number average molecular weight = 1000-5500, molecular weight distribution PDI = 1.26, and a conversion rate of 91%.

[0046] 5 g of the macromolecular precursor of the product prepared above and triethyl...

Embodiment 2

[0061] Put 2g ring-shaped copper wire and magnetic stirring bar into a 100mL Schlenk bottle, add 8.1g (27mmol) polyethylene glycol monomethyl ether methacrylate macromer (MPEG-300) (Mn=300), CuBr 2 (0.4mg, 17.8×10 -4 mmol), TPMA (4.36mg, 1.5×10 -2 mmol), dimethylaminoethyl methacrylate (DMAEMA) (4.24g, 27mmol), initiator bromoisobutyrate hydroxyethyl (31.6mg, 15 × 10 -2 mmol) and 7 mL of acetone, freezing in liquid nitrogen-vacuumizing-inflating nitrogen and melting at room temperature, repeated deoxygenation 3 times. Stir the oil bath at 30°C for 13h. The solution obtained from the reaction was precipitated in n-hexane and then dried to obtain a light yellow wetting and dispersing agent (solid), number average molecular weight = 11000-95000, molecular weight distribution PDI = 1.23, conversion rate 89%.

[0062] The wetting and dispersing experiment of this dispersant:

[0063] Dispersion of Phthalocyanine Blue (Copper)

[0064] Copper phthalocyanine: 3 grams

[0065] D...

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Abstract

The invention discloses an amphiphilic polymer pigment wetting dispersant for a water-based coating and a preparation method thereof, and the preparation method comprises the following steps: polymerizing macromer or polyethylene glycol methyl ether methacrylate macromer with polymerizable double bonds with one or two hydrophobic (methyl) polyacrylate monomers in the presence of ARGET ATRP (activators regenerated by electron transfer-atom transfer radical polymerization) to obtain a comb-shaped polymer, and further introducing an anchoring functional group in the comb-shaped polymer for preparing the solid wetting dispersant; or polymerizing the macromer or the polyethylene glycol methyl ether methacrylate macromer with the polymerizable double bonds with the (methyl) polyacrylate monomer with the anchoring functional group in the presence of ARGET ATRP to obtain the comb-shaped polymer which is the solid wetting dispersant. By using the preparation method, the cost can be greatly reduced, the efficiency is improved, and the performances of the product can be greatly improved. The obtained wetting dispersant has good dispersion effect and bright color, and the stability of a dispersion system is high.

Description

technical field [0001] The invention relates to a pigment wetting and dispersing agent and a preparation method thereof, in particular to a pigment wetting and dispersing agent for water-based paint synthesized by atom transfer radical polymerization, which belongs to the chemical paint manufacturing industry. Background technique [0002] Wetting and dispersing agent is one of the core additives in the modern coating industry. It can wet pigment particles and evenly disperse them in the coating system, while maintaining the stable dispersion state of the coating. Wetting and dispersing agents can shorten the grinding and dispersing time of pigments, reduce energy consumption, and play a decisive role in the overall performance of coatings. Polymer wetting and dispersing agent, also known as hyperdispersant, is a kind of polymer surfactant. It contains a large number of anchoring groups, and has a longer chain link that can be stably extended in the solvent. Compared with ...

Claims

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Application Information

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IPC IPC(8): C08F290/04C08F290/06C08F8/00C09D7/12
Inventor 邓国华唐传梅尹标林
Owner SOUTH CHINA UNIV OF TECH
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