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Amphiphilic polymer pigment dispersant for water paint

A technology of amphiphilic polymer and pigment dispersant, which is applied in the direction of pigment slurry and latex paint, etc., can solve the problems of unsatisfactory dispersion effect and achieve the effect of bright color, easy operation and uncomplicated preparation process

Inactive Publication Date: 2009-01-28
中山大桥化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional dispersant is an amphiphilic small molecule surfactant, but its dispersing effect on various pigments, especially organic pigments is not ideal

Method used

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  • Amphiphilic polymer pigment dispersant for water paint
  • Amphiphilic polymer pigment dispersant for water paint
  • Amphiphilic polymer pigment dispersant for water paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Add 300 grams of methyl methacrylate, 240 grams of tert-butyl methacrylate, 60 grams of hydroxyethyl methacrylate, 200 grams of toluene and 200 grams of butyl acetate in a 2-liter three-necked flask, install a condenser tube, and High-purity nitrogen was passed through the mixture for 2 hours. Then, 36 mg of chain transfer agent (COPhBF) and 3 g of initiator azobisisobutyronitrile were added into the three-necked flask under nitrogen atmosphere. Under a nitrogen atmosphere, the system is reacted in a constant temperature water bath at 70-80° C. for 6-10 hours. A light yellow viscous macromonomer solution was obtained, and a light yellow solid was obtained after removing the solvent, the number average molecular weight Mn=860, the molecular weight distribution PDI=1.6, and the conversion rate was 80%.

Embodiment 2

[0083] Add 40 grams of methyl methacrylate, 160 grams of tert-butyl methacrylate, 150 grams of toluene and 150 grams of butyl acetate into a 1-liter three-necked flask, install a condenser, and pass high-purity nitrogen into the mixture for 2 hours . Then, 6 mg of chain transfer agent (COPhBF) and 1 g of initiator azobisisobutyronitrile were added to the three-necked flask under nitrogen atmosphere. Under a nitrogen atmosphere, the system is reacted in a constant temperature water bath at 70-80° C. for 6-10 hours. A light yellow viscous macromonomer solution was obtained, and a light yellow solid was obtained after removing the solvent, the number average molecular weight Mn=6100, the molecular weight distribution PDI=1.75, and the conversion rate was 95%.

Embodiment 3

[0085] 98 grams of the macromer obtained in Example 1, 33 grams of butyl acrylate, 1.3 grams of azobisisobutyronitrile and 130 grams of toluene were added to a 500 milliliter three-necked flask. Then react in a constant temperature water bath at 70-80°C for 6-10 hours. Then the solvent was evaporated with a rotary evaporator to obtain a light yellow solid with a number average molecular weight Mn=1300, a molecular weight distribution PDI=1.78, and a conversion rate of 100%. Add 150 grams of dioxane and 90 grams of concentrated hydrochloric acid, and react in a constant temperature water bath at 80-90° C. for 10-17 hours. Evaporate the solvent therein with a rotary evaporator, add an aqueous sodium hydroxide solution, and dissolve to obtain an aqueous solution of a grafted amphiphilic polymer dispersant.

[0086] Wetting and dispersing test of this dispersant:

[0087] 1. Dispersion of carbon black

[0088] Carbon black: 2 grams

[0089] Dispersant: 0.2 g

[0090] Secondar...

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Abstract

The invention discloses an amphiphilic polymer pigment dispersant applied to hydrophilic paints, which belongs to the chemical painting producing technology. Catalytic chain transfer technology is adopted to assure a copolymerization between an ester monomer and double-bond ester, thus obtaining a macromolecule monomer with an unsaturated double-bond C=C at the end, wherein, a graft amphiphilic polyacrylate dispersant with a hydrophobic chain segment at the main chain and a hydrophilic chain segment at the branch chain is obtained by the copolymerization between the macromolecule monomer and a methyl acrylic ester monomer with a hydrophobic chain segment or a monomer with a hydrophilic chain segment; the number average molecular weight thereof is between 1000-200000. The invention has good dispersing effect, bright color, and high stability. The manufacturing steps are as follows: (1) isobutyric acid alkyl ester and the like are used for getting the macromolecule monomer with the double bonds under the chain transfer catalyst; and (2) the amphiphilic polymer pigment dispersant applied to hydrophilic paints is obtained by copolymerizing the macromolecular monomer with one or more than two types of methyl acrylic acid ester monomers with hydrophobic chain segments, or by copolymerizing one or more than two types of acrylic ester monomers with one or more than two types of hydrophilic monomers with hydrophilic chain segments.

Description

【Technical field】 [0001] The invention relates to a pigment dispersant, in particular to an amphiphilic polymer pigment dispersant for water-based paint, which belongs to the chemical paint manufacturing industry. 【Background technique】 [0002] Pigment is an important raw material in industrial production such as ink, ink, paint, rubber and plastic, and plays a pivotal role. Most of the pigment particles are small and easily bonded together by van der Waals force to form aggregates. The degree of dispersion of these pigment particles directly determines the application performance of the pigment, such as tinting strength, hiding power, transparency, etc. Therefore, in practical application, it is necessary to effectively disperse the pigment so that the particle size, particle size distribution and dispersion viscosity all become a stable dispersion system that meets the requirements. [0003] In order to obtain a stable pigment dispersion, adding a dispersant is a common...

Claims

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Application Information

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IPC IPC(8): C09D17/00C09D5/02C08F265/06
Inventor 洪昕林夏必来王永强曾广鹏胡志标张高勇
Owner 中山大桥化工集团有限公司
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