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Aqueous fluorinated polyurethane curing agent and preparation method thereof

A water-based polyurethane and curing agent technology, which is applied in the field of water-based polyurethane adhesive curing agent, can solve the problems of not many, water-based polyurethane adhesive resin heat resistance, etc., achieve excellent water resistance, improve heat resistance and water resistance Sexuality, the effect of adding a small amount

Active Publication Date: 2015-07-01
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] equipped with a thermometer and pass N 2 In a protected four-necked flask, add 10 g of fluorine-containing polyether diol FX3302 (molecular weight: 2000), vacuum dehydrate at 120°C for 2 hours, cool down to 60°C, add HDI biuret 100g, dibutyltin dilaurate 0.05g, 70 React at ℃ for 3 hours, 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 to neutralize, stir for 0.5h to get the product . Pale yellow transparent liquid, viscosity: 150mPa.s, NCO%: 7.8%. 100 parts of the resin of Comparative Example 1 plus 5 parts of the curing agent of Example 1, the test data are shown in Table 1.

Embodiment 2

[0040] equipped with a thermometer and pass N 2 In a protected four-necked flask, add 24 g of fluorine-containing polyether diol FX3302 (molecular weight: 2000), vacuum dehydrate at 120°C for 2 hours, cool down to 60°C, add HDI biuret 100g, dibutyltin dilaurate 0.05g, 70 React at ℃ for 3 hours, NCO% is 16.9%, add DMPA5.2g, 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 to get the product . Pale yellow transparent liquid, viscosity: 155mPa.s, NCO%: 7.3%. 100 parts of the resin of Comparative Example 1 plus 5 parts of the curing agent of Example 2, the test data are shown in Table 1.

Embodiment 3

[0042] equipped with a thermometer and pass N 2In the protected four-neck flask, add poly(hexafluoropentamethylene malonate) diol (molecular weight: 1500) 24g, after vacuum dehydration at 120°C for 2h, cool down to 60°C, add HDI biuret 100g, Dibutyltin dilaurate 0.02g, react at 70°C for 3h, NCO% is 16.5%, then add polyethylene glycol monobutyl ether (molecular weight 1000) 20g, react at 80°C for 3h, NCO% is 13.7%, add ethyl acetate 115g Dilute and stir for 0.5h to obtain the product. Pale 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, 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 water-based polyurethane adhesive, in particular to a water-based polyurethane adhesive curing agent. 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 groups or sulfonic acid groups, which affects the water resistance and chemical resistance of the film-forming material, and the temperature resistance of waterborne polyurethane adhesive resins is also different. big difference. Two-component water-based polyurethane adhesive is composed of water-based polyurethane adhesive resin and water-based polyurethane curing agent, which can improve the temperature resistance of water-based polyurethane adhesive resin. [0003] The ways to improve the temperature resistance of two-component waterborne polyurethane adhesives are: (1) improving the resin stru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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