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Aqueous fluorinated polyurethane curing agent and preparation method thereof

A water-based polyurethane and curing agent technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve many problems, such as the improvement of heat resistance of water-based polyurethane adhesive resins, and achieve water resistance. Excellent, improves heat resistance and water resistance, and improves adhesive strength

Active Publication Date: 2013-02-06
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the current water-based polyurethane curing agent can play a cross-linking role, it does not improve the heat resistance of the water-based polyurethane adhesive resin much.

Method used

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  • Aqueous fluorinated polyurethane curing agent and preparation method thereof
  • Aqueous fluorinated polyurethane curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] When equipped with a thermometer and N 2 In a protected four-necked flask, add 10g of fluorine-containing polyether glycol FX3302 (molecular weight 2000), vacuum and dehydrate at 120°C for 2h, cool to 60°C, add 100g HDI biuret, 0.05g dibutyltin dilaurate, 70 React for 3h at ℃, NCO% is 19.4%, then add 5.2g of DMPA, react at 80℃ for 3h, NCO% is 15.8%, add 115g of ethyl acetate to dilute, add 3.9g of triethylamine for neutralization, stir for 0.5h, get the product . Light yellow transparent liquid, viscosity: 150mPa.s, NCO%: 7.8%. 100 parts of the resin of Comparative Example 1 and 5 parts of the curing agent of Example 1 were added. The test data are shown in Table 1.

Embodiment 2

[0040] When equipped with a thermometer and N 2 In a protected four-necked flask, add 24g of fluorine-containing polyether glycol FX3302 (molecular weight 2000), vacuum and dehydrate at 120°C for 2h, cool to 60°C, add 100g HDI biuret, 0.05g dibutyltin dilaurate, 70 React at ℃ for 3h, NCO% is 16.9%, then add 5.2g of DMPA, react at 80℃ for 3h, NCO% is 13.6%, add 115g of ethyl acetate to dilute, add 3.9g of triethylamine to neutralize, stir for 0.5h, then get the product . Light yellow transparent liquid, viscosity: 155mPa.s, NCO%: 7.3%. 100 parts of the resin of Comparative Example 1 and 5 parts of the curing agent of Example 2 are added. The test data are shown in Table 1.

Embodiment 3

[0042] When equipped with a thermometer and N 2 In a protected four-neck flask, add 24g of poly(hexafluoropentamethylenemalonate) glycol (molecular weight 1500), vacuum and dehydrate at 120°C for 2h, then cool to 60°C, add 100g HDI biuret, Dibutyltin dilaurate 0.02g, react at 70℃ for 3h, NCO% is 16.5%, then add 20g polyethylene glycol monobutyl ether (molecular weight 1000), react at 80℃ for 3h, NCO% is 13.7%, add ethyl acetate 115g Dilute and stir for 0.5h to obtain the product. Light yellow transparent liquid, viscosity: 120mPa.s, NCO%: 7.2%. 100 parts of the resin of Comparative Example 1 plus 5 parts of the curing agent of Example 3, and the test data are shown in Table 1.

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Abstract

The invention discloses an aqueous fluorinated polyurethane curing agent and a preparation method thereof. The curing agent is prepared from the following substances in parts by mass through reaction: 100 parts of isocyanate or derivative of the isocyanate, 10-25 parts of fluoropolymer, 5-20 parts of compound containing hydrophilic groups, 50-120 parts of solvent, 0.02-0.05 parts of catalyst and 0-3.9 parts of neutralizer. The method comprises the steps of conducting conventional dehydration treatment on the fluoropolymer, adding the isocyanate or the derivative of the isocyanate and the catalyst at 60-80 DEG C, preserving the heat and reacting till the isocyanate content reaches a theoretical value, and then adding the compound containing the hydrophilic groups, reacting at 60-80 DEG C to a theoretical NCO value, diluting with the solvent, and neutralizing with the neutralizer to obtain the product. The curing agent is light yellow or water white liquid, has the viscosity of 0-300 mPa.s and the NCO% of 5%-12%, and can improve the heat resistance and the water resistance of aqueous polyurethane adhesive resin and the bonding strength.

Description

Technical field [0001] The invention relates to a two-component waterborne polyurethane adhesive, and particularly relates to a curing agent for waterborne polyurethane adhesives. Background technique [0002] In recent years, water-based polyurethane adhesives have been widely used. However, one-component waterborne polyurethane adhesives need to introduce hydrophilic groups such as carboxyl or sulfonic acid groups, which affects the water resistance and chemical resistance of the film. Different temperature resistance of waterborne polyurethane adhesive resins is also relatively high. Big difference. The two-component waterborne polyurethane adhesive is composed of waterborne polyurethane adhesive resin and waterborne polyurethane curing agent, which can improve the temperature resistance of the waterborne polyurethane adhesive resin. [0003] Ways to improve the temperature resistance of two-component waterborne polyurethane adhesives are: (1) improve the resin structure of th...

Claims

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Application Information

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IPC IPC(8): C08G18/78C08G18/79C08G18/76C08G18/50C08G18/46C08G18/32C09J175/04
Inventor 付立成董火成于文杰张俊良
Owner LIMING RES INST OF CHEM IND
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