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High solidness low viscosity nano composite polyester resin and method of preparation

A high-solid, low-viscosity, polyester resin technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of difficult preparation of high-solid nanocomposite resins, difficult removal of modifiers, and increased viscosity of the system. Effects of reduced hydrogen bonding, high silica concentration, and improved wear resistance of coatings

Inactive Publication Date: 2005-07-06
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the surface of nano-silica particles usually has a large number of hydroxyl groups, it has strong hydrophilicity, and its poor compatibility with organic resins limits its use.
Modifiers such as ethanol, surfactants, silane coupling agents, titanate coupling agents, etc. are often used for surface modification, or functional groups such as double bonds, epoxy groups or amino groups are introduced on the surface of nano-silica particles , chemically bonded with the organic resin, but all the modification methods take a long time, and the excess modifier is difficult to remove, which directly affects the performance of the coating
In addition, the introduction of nano-silica into the resin system usually leads to a great increase in the viscosity of the system, making it difficult to prepare high-solid nanocomposite resins.

Method used

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  • High solidness low viscosity nano composite polyester resin and method of preparation
  • High solidness low viscosity nano composite polyester resin and method of preparation
  • High solidness low viscosity nano composite polyester resin and method of preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In a 500ml four-neck flask equipped with a thermometer, a condenser, a nitrogen port, and a stirrer, add 1.0mol of undecanedibasic acid, 1.3mol of 1,4-butanediol, 0.7mol of polyethylene glycol with a molecular weight of 200, The silica sol whose nano-silica content accounts for 14% of the total weight of the resin is heated up to 120°C for 30 minutes to remove the solvent in the sol, then heated up to 160-180°C, reacted for 4 hours, slowly cooled to room temperature, and discharged. The nano-silica composite hydroxyl-terminated polyester resin is obtained.

Embodiment 2

[0023] In a 500ml four-necked flask equipped with a thermometer, a condenser, a nitrogen port, and a stirrer, add 0.3mol of 1,4-cyclohexanedicarboxylic acid, 0.4mol of azelaic acid, 0.3mol of octadecanedioic acid, and 0.3mol of a Diethylene glycol acetal, 0.2mol 2-ethyl-2-propyl-1,3-propanediol, 0.5mol 1,6-hexanediol, 0.1mol trimethylolpropane, nano-silica content accounted for the total resin For 6% silica sol by weight, heat up to 120°C for 30 minutes to remove the solvent in the sol, continue to heat up to 160-180°C, react for 5 hours, then heat up to 200-220°C for 1 hour, slowly cool to room temperature, The material is discharged to obtain a nano-silica composite polyester resin.

Embodiment 3

[0025] In a 500ml four-necked flask equipped with a thermometer, a condenser, a nitrogen port, and a stirrer, add 0.2mol of hexahydrophthalic anhydride, 0.3mol of adipic acid, 0.1mol of terephthalic acid, and 0.2mol of isophthalic acid Acid anhydride, 0.2mol 1,4-cyclohexanedicarboxylic acid, 0.6mol 1,4-cyclohexanediol, 0.8mol polyether diol with a molecular weight of 500, and silica sol whose nano-silica content accounts for 1% of the total weight of the resin , heat up to 120°C for 30 minutes to remove the solvent in the sol, continue to heat up to 180-200°C, react for 6 hours, then heat up to 220-240°C for 0.5 hours, slowly cool to room temperature, and discharge to obtain nano-silica Composite hydroxyl-terminated polyester resin is cured at room temperature with PAPI curing agent to form a film at NCO / OH=0.98, and 0.02% of triethylenediamine is added as a catalyst to obtain a polyurethane coating.

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Abstract

The invention relates to a high solidness low viscosity nano composite polyester resin and method of preparation, wherein silicon dioxide colloidal having a grain diameter of 10-150 with hydroxyl on the surface is mixed with polyhydric alcohols and dicarboxylic acids to synthesize nano silica dioxide composite polyester resin with a molecular weight of 1000-5000, hydroxyl value 80-200mgKOH / g, solid content greater than 95wt%, viscosity being 800-2000mPs.s through molten in-situ polymerization method, the content of the nano silicon dioxide is 1-15wt% of the nano silicon dioxide composite polyester resin.

Description

technical field [0001] The invention relates to the field of chemical industry, and relates to a high-solid and low-viscosity nano-composite polyester resin and a preparation method thereof. Background technique [0002] Introducing nano-silica into the resin system can significantly improve the hardness, wear resistance, scratch resistance, mechanical properties and ultraviolet shielding properties of the resin coating. However, due to the fact that the surface of nano-silica particles usually has a large number of hydroxyl groups, it has strong hydrophilicity, and its poor compatibility with organic resins limits its use. Modifiers such as ethanol, surfactants, silane coupling agents, titanate coupling agents, etc. are often used for surface modification, or functional groups such as double bonds, epoxy groups or amino groups are introduced on the surface of nano-silica particles , chemically bonded with the organic resin, but all the modification methods take a long time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/668C08K3/36C08L67/02C09D175/06
Inventor 武利民陈永春游波周树学顾广新
Owner FUDAN UNIV
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