Toluene-diisocyanate-modified alkyd resin and preparation method thereof

A technology of toluene diisocyanate and alkyd resin, which is applied in the field of toluene diisocyanate modified alkyd resin and its preparation, can solve the problems of increased resin viscosity, low resin molecular weight and viscosity increase, and can improve dry hardness and water resistance. high gloss, good water resistance

Inactive Publication Date: 2017-08-11
江苏三木化工股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. It is made by alcoholysis method, and the color of the resin is relatively dark, which limits the application field of the resin, for example, it cannot be applied to white enamel with high requirements
[0005] 2. The oil length of the resin is relatively long, generally above 45%, and it is diluted with 200# of aliphatic hydrocarbon, the molecular weight of the resin is low, the softening point is low, and the dryness and hardness of the resin are not very ideal
[0006] 3. The viscosity of the resin will increase after storage for a period of time. The main reason is that the ratio of -OH in the alkyd resin oligomer to -NCO in the added TDI is generally 1-1.1:1 (traditionally, it is believed that the excess of hydroxyl groups is good for water resistance) , the excess of hydroxyl groups is small, when it reacts with isocyanate bonds in TDI, it will not completely react to form urethane bonds, and there is residual -NCO in the resin. As the storage time increases, the viscosity of the resin will increase.

Method used

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  • Toluene-diisocyanate-modified alkyd resin and preparation method thereof
  • Toluene-diisocyanate-modified alkyd resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. A toluene diisocyanate modified alkyd resin, which is made of the following mass percentages of raw materials: 17% soybean oil fatty acid, 11% monopentaerythritol, 5% glycerin, 14% phthalic anhydride, 10% benzoic acid, 0.15% secondary Phosphoric acid, 5% toluene diisocyanate, 0.05% dibutyltin, 3% xylene, 34.8% toluene.

[0031] 2. Preparation method of toluene diisocyanate modified alkyd resin,

[0032] (1) Put the mass ratio of 17% soybean oil fatty acid, 11% monopentaerythritol, 5% glycerol, 14% phthalic anhydride, 10% benzoic acid, 0.15% hypophosphorous acid, 0.05% dibutyltin, and 3% xylene into the reactor , Heat up to 180°C for 3 hours, then heat up to 220°C in 2 hours, then heat to reflux at 220°C for esterification;

[0033] (2) After heating and refluxing the esterification reaction for 2 hours, start sampling to measure the acid value. When the acid value is less than or equal to 3mgKOH / g, start to cool down. When the kettle temperature drops to 180°C, add 34.8% t...

Embodiment 2

[0035] 1. A toluene diisocyanate modified alkyd resin, which is made of the following mass percentages of raw materials: 15% dry rapeseed oleic acid, 9% monopentaerythritol, 3% trimethylolpropane, 12% phthalic anhydride, 8 % Benzoic acid, 0.10% triphenyl phosphite, 4% toluene diisocyanate, 0.03% stannous octoate, 48.87% xylene.

[0036] 2. Preparation method of toluene diisocyanate modified alkyd resin,

[0037] (1) The mass ratio is 15% dry rapeseed oleic acid, 9% monopentaerythritol, 3% trimethylolpropane, 12% phthalic anhydride, 8% benzoic acid, 0.10% triphenyl phosphite and 1% Put toluene into the reaction kettle, heat up to 180°C for 3 hours, then heat up to 220°C in 3 hours, and then heat to reflux at 230°C for esterification;

[0038] (2) After heating and refluxing the esterification reaction for 2 hours, start sampling to measure the acid value. When the acid value is less than or equal to 3mgKOH / g, start to cool down. When the kettle temperature drops to 180°C, add 47.87% ...

Embodiment 3

[0040] A toluene diisocyanate modified alkyd resin, which is made of the following mass percentage of raw materials: 16% linseed oil fatty acid, 10% monopentaerythritol, 4% trimethylolethane, 13% phthalic anhydride, 9% benzoic acid , 0.10% color reducing agent, 4% toluene diisocyanate, 0.04% monobutyl tin oxide, 2% xylene, 41.86% trimethylbenzene.

[0041] (1) Put the mass ratio as follows: 16% linseed oil fatty acid, 10% monopentaerythritol, 4% trimethylolethane, 13% phthalic anhydride, 9% benzoic acid, 0.10% color reducing agent and 2% xylene. In the reactor, heat up to 190°C for 2 hours, then heat up to 220°C in 2 hours, and then heat to reflux at 230°C for esterification;

[0042] (2) After heating and refluxing the esterification reaction for 2 hours, start sampling to measure the acid value. When the acid value is less than or equal to 3mgKOH / g, start to cool down. When the kettle temperature drops to 180°C, add 47.87% toluene, and when the kettle temperature drops When it r...

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PUM

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Abstract

The invention discloses toluene-diisocyanate-modified alkyd resin and a preparation method thereof; the toluene-diisocyanate-modified alkyd resin is prepared from 15-17% of dry or semidry vegetable oleic acid, 9-11% of pentaerythritol, 3-5% of a tribasic alcohol, 12-14% of phthalic anhydride, 8-10% of benzoic acid, 0.05-0.15% of a color reducer, 2-5% of toluene diisocyanate, 0.03-0.05% of an organic tin catalyst, 1-3% of xylene, and 40-49% of an organic solvent. The toluene-diisocyanate-modified alkyd resin prepared with the above raw materials has light color, good adhesion, high drying speed, high hardness, high paint film gloss, good watertightness and good viscosity stability, the defects of the prior art can be overcome, and good technical advantages are achieved.

Description

Technical field [0001] The invention relates to a resin, in particular to a toluene diisocyanate modified alkyd resin with strong environmental protection, superior performance, good dryness and storage stability, and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] The application of toluene diisocyanate (TDI) modified alkyd resin is the same as that of ordinary air-drying alkyd resin, mainly by adding a drier to automatically oxidize and dry in the air to form a film, which can be made into varnish, color paint, and various coatings And auxiliary materials become alkyd resin paint system. Due to the introduction of urethane bonds in the resin, the paint film has better drying properties, hardness and wear resistance than ordinary air-drying alkyd resins. [0003] The mainstream practice in the industry now is to use vegetable oils and polyols after alcoholysis and esterification with phthalic anhydride into alkyd ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/42C08G63/49C08G18/76C09D175/06
CPCC08G18/4288C08G18/7614C08G63/48C09D175/06
Inventor 杨森惠正权
Owner 江苏三木化工股份有限公司
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