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Polyester dispersing agent and preparation method thereof

A dispersant and polyester technology, which is applied in the field of polyester dispersant and its preparation, can solve the problems of limited application range and narrow application range of solvent polarity, and achieve the effect of expanding application range and improving anchoring ability

Inactive Publication Date: 2014-06-18
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most polyester hyperdispersants have a narrow range of solvent polarity, which limits their application range

Method used

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  • Polyester dispersing agent and preparation method thereof

Examples

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example 1

[0019] 1) Dissolve 0.4 g of phthalic anhydride in 12 ml of xylene, and slowly drop it into a 250 ml three-necked flask containing 3 g of polyethyleneimine (molecular weight 1800, 99%), and react at 100 ℃ for 5 h 2) Add 40 g of caprolactone, 0.4 g of dibutyltin dilaurate, increase the temperature to 150 ℃ under the protection of nitrogen, and keep it for 6 hours; 3) Add 1.0 g of stearic acid, and react at 170 ℃ under reduced pressure Get the product in 3 h.

example 2

[0021] 1) Dissolve 0.5 g of phthalic anhydride in 20 ml of xylene, and slowly drop it into a 250 ml three-necked flask containing 8 g of polyethyleneimine aqueous solution (molecular weight 3600, 50%), and react at 110 ℃ 4 h and reflux to remove water; 2) Add 36 g of poly-12-hydroxystearic acid with an acid value of 24.5, raise the temperature to 160 ℃ under the protection of nitrogen, and use a water trap to remove the water generated by the reaction while the xylene is refluxed , Continue the reaction for 7 h; add 0.6 g of stearic acid and react at 180 ℃ for 2 h, then perform vacuum distillation at 160 ℃ until no obvious droplets flow out, and cool to obtain the product.

example 3

[0023] 1) Dissolve 0.2 g of phthalic anhydride in 15 ml of xylene, and slowly drop it into a 250 ml three-necked flask containing 3 g of polyethyleneimine (molecular weight 10,000, 99%), and react at 120 ℃ for 4 h Then, distill under reduced pressure to remove xylene; 2) Add 27.8 g of caprolactone, 14.5 g of poly-12-hydroxystearic acid with an acid value of 32.47, and 0.1 g of dibutyltin dilaurate, and raise the temperature to 155 under the protection of nitrogen. Keep it at ℃ for 6 h; 3) Add 1 g of stearic acid and react for 1.5 h at 175 ℃ under reduced pressure to obtain the product.

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Abstract

The invention discloses a polyester dispersing agent shown as a formula I in the specification, wherein PW is polyethyleneimine residue, W represents the number of amino which is not reacted with phthalic anhydride, and W is greater than 10 but less than 600; m represents the number of amino which is reacted with phthalic anhydride in polyethyleneimine, and m is greater than 1 but less than W; B is poly epsilon-caprolactone, poly 12-hydroxystearic acid or a residue after reaction of poly epsilon-caprolactone and poly 12-hydroxystearic acid; P and B are coupled by an amido bond and Y and B are coupled by an ester bond; Y is a residue R-CO- of stearic acid; n represents the number of ester bonds in B and n is an integer ranging from 4 to 20. A preparation method of the polyester dispersing agent shown as the formula I is characterized by comprising the following steps: 1) carrying out a reaction on phthalic anhydride and polyethyleneimine; 2) introducing poly epsilon-caprolactone or poly 12-hydroxystearic acid or a mixture of the poly epsilon-caprolactone and the poly 12-hydroxystearic acid to form a grafted polyester chain; and 3) blocking by stearic acid to obtain the polyester dispersing agent. The polyester dispersing agent disclosed by the invention is wide in range of solvent polarity, so that the application range of the polyester dispersing agent in organic solvents is effectively expanded.

Description

technical field [0001] The invention relates to a polyester dispersant and a preparation method thereof. Background technique [0002] The dispersion of solid particles in organic solvents is often involved in the production of coatings and inks. The degree of dispersion of particles directly affects the gloss, coloring strength, and rheological properties of the product. When the pigment particles are dispersed, due to the mutual attraction between the particles, the dispersion system formed is unstable and easy to agglomerate. Although surfactants have a good dispersing effect in aqueous dispersion systems, they often fail to work in solvent-based dispersion media due to their structural limitations. In order to solve this problem, a new type of polymer dispersant-hyperdispersant was developed in the 1970s. The hyperdispersant is composed of anchoring group and solvation chain, and has a better dispersion effect on pigments in solvent-based media. However, most polyeste...

Claims

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Application Information

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IPC IPC(8): C08G63/91C08G63/08C08G81/00C09D7/12C09D11/03
Inventor 师进生姚慧民吕慧娟张原原鞠小涛
Owner QINGDAO AGRI UNIV
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