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Flame retardant polyurethane resin and preparation method thereof and flame retardant polyurethane conformal coating

A polyurethane resin, conformal coating technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problem of long-term high temperature and high humidity environment or even need to be immersed in water from time to time, moisture resistance and withstand voltage performance are not required. High, paint can not meet the requirements and other problems, to achieve excellent adhesion performance, good hydrophobicity and withstand voltage performance, easy to achieve effects

Inactive Publication Date: 2012-11-21
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The commercially available one-component conformal coatings cured at room temperature either have no flame retardant function, or the flame retardant effect of the flame retardant function is not good. Even if the flame retardant effect is satisfactory, since the flame retardant is additive, the amount of Large, generally more than 30% effective, the basic performance is seriously affected
Although it can meet the requirements of general electronic components and has certain moisture-proof, water-resistant and voltage-resistant properties, it can only be used on PCBs that do not require high moisture-proof performance and voltage-resistant properties, and is no longer suitable for occasions with harsh conditions. , if the circuit board needs to be in a high temperature and high humidity environment for a long time or even needs to be soaked in water from time to time, when the distance between the circuit board pins is very close and there is a very high voltage, the coatings of the above systems cannot meet the requirements

Method used

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  • Flame retardant polyurethane resin and preparation method thereof and flame retardant polyurethane conformal coating
  • Flame retardant polyurethane resin and preparation method thereof and flame retardant polyurethane conformal coating
  • Flame retardant polyurethane resin and preparation method thereof and flame retardant polyurethane conformal coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 93.2g of castor oil, 13.4g of trimethylolpropane, 0.19g of calcium naphthenate into a 500mL three-necked flask, protect it with nitrogen, heat to make the system homogeneous, then start stirring, and raise the temperature to 240°C for 1.5 hours , measure alcohol tolerance (85% ethanol solution, 1:4 transparent is qualified), cool down to 160°C, add 20g of xylene to azeotrope with water, bring out until anhydrous, and cool to 60°C.

[0041] Under the protection of nitrogen, add metered 146.45g of xylene and 26.65g of tris(dipropylene glycol) phosphite, stir evenly, drop 167.58g of TDI (toluene diisocyanate) into the polymerization system, after dropping, keep warm for 2 hours , add 0.28g of catalyst DBTL (dibutyltin dilaurate), raise the temperature to 75°C, and keep warm for reaction; after 2.5 hours, take a sample to test the NCO content, and when the NCO content is less than 7.89%, cool down, filter, and pack to get final product.

Embodiment 2

[0043]Add 46.6g of castor oil, 6.7g of trimethylolpropane, 0.1g of cobalt naphthenate into a 500mL three-necked flask, protect it with nitrogen, heat the system to make the system homogeneous, then start stirring, and raise the temperature to 240°C for 1.5 hours , measure the alcohol tolerance (85% ethanol solution, 1:4 transparent is qualified), cool down to 160°C, add 20% xylene to azeotrope with water, bring it out without water, and cool down to 60°C.

[0044] Under the protection of nitrogen, add metered 155.71g ethylene glycol ethyl ether acetate and 53.3g tris(dipropylene glycol) phosphite, stir evenly, drop 122.63g HDI (1,6-hexamethylene diisocyanate) into Polymerization system, after dripping, keep warm for 2 hours, add 1.8g of catalyst stannous octoate; raise the temperature to 75°C, keep warm for reaction; 2.5 hours later, take a sample to test the NCO content, when the NCO content is less than 7.89%, cool down, filter, pack, Instantly.

Embodiment 3

[0046] Add 46.6g of castor oil, 6.7g of trimethylolpropane, 0.1g of zinc naphthenate into a 500mL three-necked flask, protect it with nitrogen, heat the system to make the system homogeneous, then start stirring, and raise the temperature to 240°C for 1.5 hours , measure the alcohol tolerance (85% ethanol solution, 1:4 transparent is qualified), cool down to 160°C, add 20% xylene to azeotrope with water, bring it out without water, and cool down to 60°C.

[0047] Under the protection of nitrogen, add metered 289.01g of butanone and 79.95g of tris(dipropylene glycol) phosphite, stir evenly, drop 155.76g of TDI into the polymerization system, after dropping, keep warm for 1-2 hours, add catalyst Dibutyltin di(dodecylsulfide) 1.5g; raise the temperature to 80°C, and keep it warm; take a sample after 2.5 hours to test the NCO content;

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Abstract

The invention relates to flame retardant polyurethane resin and a preparation method thereof and flame retardant polyurethane conformal coating. The preparation method of the flame retardant polyurethane resin comprises alcoholization of grease and synthetization of the flame retardant polyurethane resin, and the flame retardant polyurethane resin is prepared by the method; and the flame retardant polyurethane conformal coating comprises the following ingredients in percentage by weight: 60-80wt% of flame retardant polyurethane resin, 15-35wt% of solvent, one or more mixtures selected from quaternary ammonium salt, morpholine, imidazole derivative and 1,8-aza ring [5, 4, 0]hendecene-7-piperazine derivatives or 0.01-2wt% of a mixture of one or two selected from organic tin catalyst, carboxylic acid salt catalyst, phenylethyl acetate mercury, titanic acid ester catalyst,0-2wt% of leveling agent, 0-1.5wt% of defoaming agent, and 0-1wt% of fluorescent powder.

Description

technical field [0001] The present invention relates to a flame retardant polyurethane resin and its preparation method and flame retardant polyurethane conformal coating for protecting circuits from chemical substances (such as fuel, coolant, etc.), vibration, moisture, salt spray, humidity and high temperature, etc. It is widely used in automobile industry, aerospace industry, defense industry and bioengineering. Background technique [0002] Conformal coating is a layer of protective material coated on the circuit board (PCB) with soldered plug-in components. After the coating layer is fully cured, it can enhance the moisture-proof and anti-fouling capabilities of electronic circuits and components, and prevent solder joints and conductors from being damaged. Corrosion can also play a role in shielding and eliminating electromagnetic interference and preventing circuit short circuit, improving the insulation performance of circuit boards. In addition, the coating protect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/67C08G18/32C08G18/73C09D175/04
Inventor 马其祥王建斌陈田安
Owner YANTAI DARBOND TECH
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