Rapidly-dried water-dispersible isocyanate curing agent composition and preparation method thereof

An isocyanate and fast-drying technology, which is applied in the field of isocyanate curing agent, can solve the problems of short usable time and achieve the effect of long usable time, simple preparation method and extremely fast drying speed

Inactive Publication Date: 2019-10-18
GUANGZHOU GUANZHI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrophilic polyisocyanate synthesized by this method reacts quickly with water, gels quickly in water-based systems, and has a very short usable time, so it is rarely used in water-based two-component polyurethane coatings.

Method used

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  • Rapidly-dried water-dispersible isocyanate curing agent composition and preparation method thereof
  • Rapidly-dried water-dispersible isocyanate curing agent composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Heat 10.54 parts by mass of polyethylene glycol monomethyl ether (500 molecular weight, Haian Petrochemical, Jiangsu Province) to 100-110°C for 2 hours, then cool down to 60°C, add Desmodur N 3300 (a solvent-free HDI trimer from Covestro, NCO content is 21.8±0.3%) 49.18 parts by mass and propylene glycol methyl ether acetate 29.74 parts by mass. After the addition, the temperature is raised to 100° C., and the reaction is continued at this temperature for 4 hours. Cool to room temperature, add 10.54 parts by mass of Desmodur IL BA (Covestro TDI trimer, 51% solid content, NCO content is 8.0%), and stir evenly to obtain a 65% solid isocyanate curing agent composition that is pale yellow It is a transparent liquid with a measured NCO value of 10.7% and a viscosity (25° C.) of 300 cps.

Embodiment 2

[0037] Heat 12.43 parts by mass of polyethylene glycol polypropylene glycol monobutyl ether (2250 molecular weight, Covestro trade name LB 25, polyethylene glycol / polypropylene glycol segment ratio: 75:25) to 100-110°C for 2 hours, Cool down to 60°C, add 54.94 parts by mass of DesmodurN 3300 (Covestro solvent-free HDI trimer, NCO content: 21.8±0.3%), and 27.40 parts by mass of propylene glycol methyl ether acetate, and raise the temperature to 100°C after adding , and continued to react at this temperature for 4h. Cool to room temperature, add 5.23 parts by mass of Desmodur IL BA (Covestro TDI trimer, 51% solid content, NCO content is 8.0%), and stir evenly to obtain a 70% solid isocyanate curing agent composition that is light yellow It is a transparent liquid with a measured NCO value of 12.2% and a viscosity (25° C.) of 350 cps.

Embodiment 3

[0039]Heat 10.78 parts by mass of polyethylene glycol polypropylene glycol monobutyl ether (2250 molecular weight, Covestro trade name LB 25, polyethylene glycol / polypropylene glycol segment ratio: 75:25) to 100-110 ° C for 2 hours, Cool down to 60°C, add 47.67 parts by mass of DesmodurN 3300 (Covestro solvent-free HDI trimer, NCO content: 21.8±0.3%), and 18.84 parts by mass of propylene glycol methyl ether acetate, and raise the temperature to 100°C after adding , and continued to react at this temperature for 4h. Cool to room temperature, add Desmodur IL BA (Covestro TDI trimer, 51% solid content, NCO content is 8.0%) 22.70 parts by mass, and stir evenly to obtain a 70% solid isocyanate curing agent composition that is light yellow It is a transparent liquid with a measured NCO value of 12.0% and a viscosity (25° C.) of 400 cps.

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Abstract

The invention belongs to the technical field of isocyanate curing agents, and discloses a rapidly-dried water-dispersible isocyanate curing agent composition and a preparation method thereof. The rapidly-dried water-dispersible isocyanate curing agent composition disclosed by the invention comprises the following two parts: 50-95 parts by mass of a hydrophilically modified aliphatic polyisocyanatepart and 5-50 parts by mass of a non-hydrophilically modified aromatic polyisocyanate part. After emulsification in a water system, the non-hydrophilically modified aromatic polyisocyanate is partially wrapped by the hydrophilically modified aliphatic polyisocyanate, so that long usable time can be kept in a water phase. After water of coating construction is volatilized, the drying speed is greatly improved, and a long usable time is achieved while rapid drying is realized. The problem that an application is limited due to the fact that hydrophilically modified aliphatic polyisocyanate is fast in drying speed but very short in usable time and hydrophilically modified aliphatic polyisocyanate is slow in curing speed is solved.

Description

technical field [0001] The invention belongs to the technical field of isocyanate curing agents, in particular to a fast-drying water-dispersed isocyanate curing agent composition and a preparation method thereof. Background technique [0002] At present, water-based two-component polyurethane has been widely used in the fields covered by solvent-based two-component polyurethane, and has been successfully applied in water-based industrial paint, wood paint, floor paint and other industries. Water-based two-component polyurethane has good physical and mechanical properties, and is comparable to solvent-based two-component polyurethane in terms of gloss, hardness, and chemical resistance. Moreover, due to the low solvent content of the water-based system, it has a very large environmental protection effect compared with the solvent system. Advantage. However, the curing speed of water-based two-component polyurethane coatings is much slower than that of solvent-based two-comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/79C08G18/48C08G18/38
CPCC08G18/283C08G18/3857C08G18/792C08G18/794
Inventor 欧阳洁龙志云
Owner GUANGZHOU GUANZHI NEW MATERIAL TECH
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