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Hyperbranched polyester and preparation method thereof, modified hyperbranched polyester and application thereof in coating

A hyperbranched polyester modification technology, applied in the direction of coating, pigment slurry, etc., can solve the problem that the compatibility of the resin system is not wide enough, it is difficult to achieve large-scale promotion, and the anchoring effect of active groups is not good. Good and other problems, achieve the effect of maintaining long-term stability, improving floating color and flowering, and improving coating performance

Active Publication Date: 2016-12-07
WEIHAI CY DENDRIMER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is mainly due to the fact that most dispersants can only have good compatibility with a few types of resin systems, and the compatibility with resin systems is not wide enough, the coating stability after dispersion is poor, the results of common indicators are poor, and the dosage is large, resulting in process costs high
Most of the existing polymer dispersants are block-type polymer dispersants. Although they can solve the application defects of low molecular weight dispersants, their application limitations are relatively large, and it is difficult to achieve a wide range of general use. The group anchoring effect is not good, and the stability of the dispersed coating is poor, so it is difficult to achieve large-scale promotion

Method used

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  • Hyperbranched polyester and preparation method thereof, modified hyperbranched polyester and application thereof in coating
  • Hyperbranched polyester and preparation method thereof, modified hyperbranched polyester and application thereof in coating
  • Hyperbranched polyester and preparation method thereof, modified hyperbranched polyester and application thereof in coating

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preparation example Construction

[0025] One aspect of the embodiments of the present invention provides a kind of preparation method of hyperbranched polyester, comprising the following steps:

[0026] S1: Add polyhydric alcohol and polycarboxylic acid / anhydride to the reactor, and add catalyst therein, the addition amount of the catalyst is 0.1%-5% of the total mass of the polyhydric alcohol and polycarboxylic acid / anhydride, in an inert Under gas protection, pre-polymerize at 40°C-120°C for 1-8 hours to form polymerized monomers;

[0027] S2: Then raise the temperature to 60°C-250°C, react for 3-20 hours, then vacuumize the reaction system, and continue the reaction under reduced pressure until the acid value of the reaction system is lower than 30mg KOH / g, and the overrun is prepared chemical polyester.

[0028] In above-mentioned embodiment, mainly be to utilize above-mentioned raw material to pre-polymerize to form polymerized monomer (AB 2 ), and then further react to generate hyperbranched polyester,...

Embodiment 1

[0050] In a 100mL three-necked flask equipped with mechanical stirring, a thermometer and a spherical reflux condenser, add 15.0g (0.24mol) of ethylene glycol and 23.2g (0.12mol) of trimellitic anhydride, and add 0.04g (0.1% of ethylene glycol and trimellitic anhydride) di Dibutyltin laurate, under the protection of nitrogen, pre-polymerized at 40°C for 8h, then heated up to 100°C, vacuumed and reacted for 10h, until the acid value of the system was lower than 30mgKOH / g, cooled to obtain a colorless transparent solid, that is, hyperbranched polystyrene Esters 1.

Embodiment 2

[0052] In a 100mL three-necked flask equipped with mechanical stirring, a thermometer and a spherical reflux condenser, add 12.0g (0.13mol) of oxalic acid and 17.88g (0.13mol) of trimethylolpropane, and add 0.30g of catalyst (oxalic acid and 1% of the total mass of trimethylolpropane) butyl titanate, pre-polymerized at 60°C for 4h under the protection of nitrogen, then heated up to 180°C, and continued to react for 6h under reduced pressure until the acid value of the reaction system was lower than 30mgKOH / g, cooling to obtain a pale yellow transparent solid, i.e. hyperbranched polyester 2.

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Abstract

The invention relates to hyperbranched polyester and a preparation method thereof, modified hyperbranched polyester and application thereof in coating and belongs to the field of dispersing agents for coating, and the hyperbranched polyester is a pigment dispersing agent capable of improving the coating effect. The preparation method of the hyperbranched polyester comprises the steps that polyhydric alcohol and polybasic carboxylic acid / acid anhydride are added to a reactor, a catalyst is added to the reactor, the adding amount of the catalyst is 0.1%-5% of the total mass of the polyhydric alcohol and polybasic carboxylic acid / acid anhydride, and the mixture is pre-polymerized to form a polymeric monomer at the temperature of 40-120 DEG C for 1-8 hours; the temperature is raised to 60-250 DEG C and the reaction is performed for 3-20 hours, then the reaction system is subjected to vacummizing, the reaction is continued under the pressure reduction condition until the acid value of the reaction system is reduced to 30 mg KOH / g, and the hydroxyl terminated hyperbranched polyester is prepared. According to the hyperbranched polyester and the preparation method thereof, the modified hyperbranched polyester and the application thereof in the coating, fatty acid monomers are used for modification of terminal groups on the hydroxyl terminated hyperbranched polyester, and the modified hyperbranched polyester which can be taken as the pigment dispersing agent is obtained for the preparation process of the coating.

Description

technical field [0001] The invention relates to the field of paint dispersants, in particular to a hyperbranched polyester and a preparation method thereof, a modified hyperbranched polyester and its application in paints. Background technique [0002] Hyperbranched polyesters belong to the family of dendrimers with a large number of functional groups at the periphery. Although their polydispersity is high and their degree of branching is low, their chemical properties are very similar to their dendrimer analogs. The topological properties of hyperbranched polymers, such as good solubility, low melt viscosity, and high density of surface functional groups relative to linear polymers, make them attractive for blending applications based on the above characteristics It has great potential to improve the physical properties of blends, such as processability, crystallization behavior, mechanical properties, etc. [0003] In the production of coatings, pigment dispersants are a...

Claims

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Application Information

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IPC IPC(8): C08G63/13C08G63/12C08G63/78C08G63/91C09D7/12C09D17/00
CPCC08G63/12C08G63/13C08G63/78C08G63/914C09D7/65C09D17/00
Inventor 李武松刘聪聪谭志王战涛许士凯
Owner WEIHAI CY DENDRIMER TECH
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