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Hyper-branched polyester resin pigment dispersant, preparation method and color paste thereof, as well as applications of color paste

A technology of hyperbranched polyester and resin pigments, which is applied in the direction of pigment slurry, chemical instruments and methods, anti-corrosion coatings, etc., and can solve the adverse effects of unfavorable cross-linking reaction, acid resistance, alkali resistance, water resistance, hyperbranched polyester hydroxyl Reduce functional groups and other issues, achieve good thermal storage stability, slow down precipitation and floating color, and improve compactness

Inactive Publication Date: 2014-01-08
NIPPON PAINT IND COATINGS SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: after modification, the hydroxyl functional groups of hyperbranched polyester are greatly reduced, which is not conducive to the next step of crosslinking reaction, and at the same time, a large number of carboxyl groups are introduced, which will greatly affect the acid resistance, alkali resistance and water resistance of the coating after film formation. big adverse effects

Method used

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  • Hyper-branched polyester resin pigment dispersant, preparation method and color paste thereof, as well as applications of color paste
  • Hyper-branched polyester resin pigment dispersant, preparation method and color paste thereof, as well as applications of color paste
  • Hyper-branched polyester resin pigment dispersant, preparation method and color paste thereof, as well as applications of color paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Add 1 mole of Boltorn H4001 solution and 0.5 mole of methylhexahydrophthalic anhydride to a four-neck flask equipped with a stirrer, thermometer and condenser, start stirring and raise the temperature to 130°C. insulation reaction;

[0036] (2) Test the acid value of the solution after 1 hour of reaction, and then test the acid value of the solution every 30 minutes until the acid value of the solution is stable. Then add 0.5 mole of glycidyl tert-butyl benzoate, and keep it warm at 140°C for reaction. After 4 hours, check the acid value of the solution every hour until the acid value of the solution reaches a stable range of 2-10mgKOH / g, which is the end of the reaction. Add diluting solvent butyl acetate, adjust solid content 70%, obtain a kind of light yellow transparent liquid and be product hyperbranched polyester resin pigment dispersant, its solid hydroxyl content is 4.3%, number average molecular weight is 6550, weight average molecular weight is 12090.

Embodiment 2

[0038] (1) Add 1 mole of Boltorn H4001 solution and 0.3 mole of phthalic anhydride to a four-necked flask equipped with a stirrer, a thermometer and a condenser, start stirring and raise the temperature to 110°C, and keep the temperature at 110°C for reaction;

[0039] (2) Check the acid value after 1 hour of reaction, and then check the acid value every 30 minutes until the acid value is stable. Then add 0.3 mole of glycidyl 2-ethylhexanoate, keep the temperature at 150°C for reaction, check the acid value every 1 hour after 4 hours, until the acid value reaches a stable range of 2-10mgKOH / g, which is the end of the reaction, add Dilute solvent butyl acetate, adjust solid content 70%, the product that obtains is a kind of light yellow transparent liquid and is product hyperbranched polyester pigment dispersant, and its solid hydroxyl content is 5.4%, number average molecular weight is 5730, weight average molecular weight for 10550.

Embodiment 3

[0041] (1) Add 1 mole of Boltorn H4001 solution and 0.1 mole of trimellitic anhydride to a four-necked flask equipped with a stirrer, a thermometer and a condenser, start stirring and raise the temperature to 110°C, and keep the reaction at 110°C;

[0042] (2) Check the acid value after 1 hour of reaction, and then check the acid value every 30 minutes until the acid value is stable. Then add 0.2 moles of glycidyl tertiary carbonic acid ester, keep it warm at 140°C, and check the acid value every hour after 4 hours until the acid value reaches a stable range of 2 to 10 mgKOH / g, which is the end of the reaction, and add the diluting solvent butyl acetate Ester, adjust the solid content to 70%, and the product obtained is a light yellow transparent liquid, which is a hyperbranched polyester pigment dispersant, and the solid hydroxyl content is 7.1%.

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Abstract

The invention discloses a hyper-branched polyester resin pigment dispersant, a preparation method and color paste thereof, as well as applications of the color paste. The hyper-branched polyester resin pigment dispersant is a dendritic and hyper-branched polyester having hydroxyl functional groups and a 3D structure, the number-average molecular weight of the dispersant is 1500 to 20000, and the solid content of the dispersant is from 20% to 90%. The dispersant is prepared by the following steps: subjecting anhydride to carry out reactions with hyper-branched polyester, and then subjecting the reaction products to carry out reactions with a compound, whose one end is a mono-epoxy functional group and the other end is a hydrophobic long carbon chain, so as to obtain the dispersant. The introduced long chain alkyl / aryl in the dispersant has a structure like the anchor hook, thus the dispersant has a very good compatibility with the main resin molecular of paint, and can reduce the possibility of secondary flocculation or aggregation of the disperse system. The paint or color paste containing the hyper-branched polyester resin pigment dispersant only needs a very short grinding time to meet the fineness requirement; the dispersant is applied to a finished paint to enable the finished paint to have the properties of high hardness and good stability under high-temperature storage or room temperature storage, and effectively reduces the phenomenon of sediment and unfixed dyeing of the finished paint.

Description

technical field [0001] The invention relates to the technical field of pigment dispersants and color pastes, in particular to a hyperbranched polyester resin pigment dispersant, a preparation method, a color paste, and an application of the color paste. Background technique [0002] As a colorant, the pigment can only exert a good coloring effect if it is uniformly and stably dispersed in the coating film. At present, surfactants and some low-molecular coupling agents are generally used to modify the surface of pigments, change the polarity of the pigment surface, and reduce the agglomeration and flocculation of pigments. However, in the actual application of pigment dispersion and preparation of color paste, there are still low dispersion efficiency of color paste, the prepared paint is prone to precipitation during storage, and the paint film has the phenomenon of floating color and blooming. [0003] Compared with traditional linear polymers, hyperbranched polyester has ...

Claims

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Application Information

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IPC IPC(8): C08G63/91B01F17/52C09D17/00C09D5/08C09K23/52
CPCC08G63/91C09D17/003C09D17/004C09D17/005C09D17/007
Inventor 何东风施珠容金志光李世冰汪少锋萧正铭梁健
Owner NIPPON PAINT IND COATINGS SHANGHAI
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