Modified polyurethane curing agent for alkyd resin with high hydroxyl content and preparation method thereof

A polyurethane curing agent, high-hydroxy alkyd technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of less polyol, high cost of curing agent, poor crosslinking density, etc., and achieve high NCO content , a wide range of application fields, and the effect of excellent use characteristics

Active Publication Date: 2011-07-06
四川嘉宝莉涂料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high price of trimethylolpropane raw materials, this type of curing agent has a high cost and cannot meet the special requirements of some low-end markets
[0004] Some polyurethane curing agent manufacturers use general hydroxyl-containing alkyd resins and trimethylolpropane and NCO-containing toluene diisocyanate (TDI) to synthesize modified polyurethane curing agents through specific formulas and processes. The hydroxyl content of the alkyd resin used is less than 5.5%, and relatively speaking, the alkyd resin formula contains more saturated fatty acids, while the hard monomeric acid content containing a benzene ring structure is less, and the alky

Method used

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  • Modified polyurethane curing agent for alkyd resin with high hydroxyl content and preparation method thereof
  • Modified polyurethane curing agent for alkyd resin with high hydroxyl content and preparation method thereof
  • Modified polyurethane curing agent for alkyd resin with high hydroxyl content and preparation method thereof

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Embodiment Construction

[0068] The present invention will be described in detail below in conjunction with specific embodiments. The description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present invention.

[0069] It should be noted that: toluene diisocyanate used in the following examples, BHT, dibutyltin dilaurate, xylene, butyl acetate, ethyl acetate, dimethyl carbonate, and toluene are all domestic industrial grade raw materials, alkyd The resin is an industrial-grade 60% solid semi-finished raw material produced by Guangdong Carpoly Chemical Group Co., Ltd.

[0070] Following embodiment prepares the method for high hydroxyl alkyd resin modified polyurethane curing agent, all adopts the same process that comprises following steps, just the raw material ratio of each embodiment is different:

[0071] 1. Prepare a four-neck flask equipped with a thermometer, condenser, and stirring paddle;

[0072] 2. Add butyl acetate, ...

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Abstract

The invention discloses a modified polyurethane curing agent for an alkyd resin with high hydroxyl content. The modified polyurethane curing agent is prepared by the following raw materials by weight parts: 5-8 of alkyd resin, 5-8 of trimethylolpropane and 26-29 of toluene diisocynate, wherein the hydroxyl content of the alkyd resin is 5.5 to 6.4 percent. The invention also provides a preparation method for the modified polyurethane curing agent. The addition reaction is performed among the alkyd resin with hydroxyl content of 5.5 to 6.4 percent, trimethylolpropane and toluene diisocynate containing NCO groups, and the prepared modified bicomponent polyurethane curing agent has crosslinked NCO groups with high reactivity, so that modified polyurethane curing agent can be copolymerized with paint component containing hydroxyl groups at normal temperature to form paint films with different characteristics. Therefore, the modified polyurethane curing agent is excellent in operational performance and wide in application field.

Description

technical field [0001] The invention relates to the technical field of curing agents, in particular to a high-hydroxy alkyd resin modified polyurethane curing agent and a preparation method thereof. Background technique [0002] The two-component polyurethane curing agent contains active NCO groups, which can cross-link with paint components containing active hydroxyl groups to form paint films with various properties. [0003] The general two-component polyurethane curing agent is a kind of curing agent with the largest production volume and the most widely used in my country, which is synthesized by using trimethylolpropane (TMP) and toluene diisocyanate (TDI) through a specific formula and process reaction. Due to the high price of trimethylolpropane raw materials, this type of curing agent has a high cost and cannot meet the special requirements of some low-end markets. [0004] However, some polyurethane curing agent manufacturers use general hydroxyl-containing alkyd ...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/66C08G18/42C09D175/06
Inventor 朱建锋
Owner 四川嘉宝莉涂料有限公司
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