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Poly-isocyanurate polyurethane coating curing agent and preparation method thereof

A technology of polyisocyanurate and isocyanurate, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problem of no pure MDI trimer products, achieve excellent adhesion, and reduce production costs , The effect of low cost of paint matching

Active Publication Date: 2012-09-26
SHANDONG INOV POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently there is no pure MDI trimer product on the market

Method used

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  • Poly-isocyanurate polyurethane coating curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 108.3g of toluene diisocyanate (TDI) and 55g of ethyl acetate into a four-neck flask equipped with a condenser and nitrogen protection, start heating and stirring, and raise the temperature to 40°C to 45°C within 10min. Add 100g of isocyanurate-based polyether polyol in batches, and add the material every 20 minutes. After the feeding is completed and the temperature is stable, slowly raise the temperature to 65°C-70°C within 30 minutes, keep the temperature for 2 hours, and then raise the temperature to 80°C within 20 minutes. Insulate at ~85°C for 1 hour, take samples to detect -NCO content, stop the reaction when the -NCO content is between 10.15% and 10.25%, add 0.02g of phosphoric acid, stir for 20 minutes, cool down to 50°C, discharge, and store in a nitrogen seal.

Embodiment 2

[0022] Add 138.4g of isophorone diisocyanate (IPDI) and 104g of ethyl acetate into a four-necked flask with a condenser and nitrogen protection, start heating and stirring, and raise the temperature to 50°C to 55°C within 10min. Add 100g of isocyanurate-based polyether polyol in 3 batches, and add the material every 20 minutes. After the feeding is completed and the temperature is stable, slowly raise the temperature to 75 ° C ~ 80 ° C within 30 minutes, keep the temperature for 3 hours, and then raise the temperature within 20 minutes Heat the reaction at 85°C to 90°C for 2 hours, take a sample to detect the -NCO content, stop the reaction when the -NCO content is between 7.50% and 8.00%, add 0.02g of phosphoric acid, stir for 20min, cool down to 50°C and discharge, nitrogen seal save.

Embodiment 3

[0024] 63.7g of toluene diisocyanate (TDI), 42.5g of hexamethylene diisocyanate (HDI) and 140g of ethyl acetate were added to a four-necked flask with a condenser and nitrogen protection, started heating and stirring, and heated up to 45℃~50℃, at this temperature, add 100g of isocyanurate-based polyether polyol in 4 batches, add the material every 20 minutes, after the feeding is completed and the temperature is stable, slowly increase the temperature to 70℃~75℃ within 30min , heat preservation reaction for 2 hours, then heat up to 80 ℃ ~ 85 ℃ heat preservation reaction for 2 hours within 20 minutes, take a sample to detect the -NCO content, when the -NCO content is between 7.40% and 7.80%, stop the reaction, add 0.02g of phosphoric acid, stir for 20 minutes, Cool down to 50°C and discharge, and store in a sealed nitrogen atmosphere.

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Abstract

The invention relates to a poly-isocyanurate polyurethane coating curing agent and a preparation method thereof. The curing agent is isozyanurat ring-containing structure and polyurethane prepolymer solution of which end is sealed by NCO group by the means that isozyanurat-based polyether glycol is reacted with polyisocyanate in acetate dissolvants, and polymerization inhibitor is further added into the solution. The curing agent has the chemical structure which is similar to isocyanate tripolymer curing agent; the curing agent is low in viscosity, good in storing stability, and low in cost; and the hydroxy acrylic resin and the alkyd resin are good in consistency. The prepared film has the characteristics of being good in adhesive force, flexibility, thermostability, weather resistance and corrosion resistance, high in hardness and the like, thereby being applicable to the high-grade field of vehicle painting.

Description

technical field [0001] The invention belongs to the technical field of polyurethane curing agent synthesis, and in particular relates to a polyisocyanurate polyurethane coating curing agent with good compatibility and a preparation method thereof. Background technique [0002] At present, the most commonly used polyurethane coating curing agent in China is mostly a prepolymer formed by the reaction of trimethylolpropane and toluene diisocyanate. As a universal curing agent for polyurethane, it has the characteristics of high storage stability, good leveling, fast drying, and easy sanding. It can be used in the preparation of high-gloss, matte topcoats and primers. As for the coating curing agent with fast drying of the coating film, high requirements on matting property and yellowing resistance, most of the coating curing agents currently use isocyanate trimer curing agent. Common trimer products currently on the market mainly include TDI trimer, HDI trimer, IPDI trimer, TD...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/79C08G18/48C08G18/10C09D175/08
Inventor 孙清峰孙兆任鞠伟坦
Owner SHANDONG INOV POLYURETHANE
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