A kind of moisture curing one-component exposed polyurethane and its preparation method

A one-component, polyurethane technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of low reactivity, coating bubbling, poor mechanical properties of cured products, etc., to achieve good storage stability, good stability The effect of stability and fast curing speed

Active Publication Date: 2016-02-10
HEBEI YUYANGZELI WATERPROOF MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it will produce carbon dioxide when it interacts with moisture, which will cause bubbling and honeycombing in the coating. This phenomenon is more serious when the coating is thicker; when the temperature is 5°C, the curing time of polyurethane is longer, and it generally takes several days to cure.
Aromatic polyurethane is not resistant to yellowing, and it will turn yellow after a few days of outdoor use, while aliphatic isocyanate has low reactivity with polyol compounds, and the mechanical properties of cured products are poor
[0005] At present, there is no effective solution to solve the above problems

Method used

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  • A kind of moisture curing one-component exposed polyurethane and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0045] Add 10% isophorone diisocyanate into the reaction kettle, heat up to 50-60°C, then drop 50% amino-terminated polyether D2000 to remove moisture, raise the temperature after the dropwise addition, and keep warm at 80°C-120°C for reaction After 2 hours, the prepolymer was prepared, and then the temperature was lowered to 50-60°C, and 5% dehydrated rutile titanium dioxide, 30% filler kaolin, 0.5% ultraviolet absorber UV531, 0.5% antioxidant 1010 and 4% latent curing agent amino Formate diazolidine HardenerVPLS2959, after stirring for 0.5h, the material is discharged to form a finished product, and then reacts to form a film by contacting with moisture in the air.

Embodiment 2

[0047] Add 15% hexamethylene diisocyanate into the reaction kettle, heat up to 50-60°C, then add 35% amino-terminated polyether D2000 to remove moisture dropwise, raise the temperature after the dropwise addition, and keep warm at 80°C-120°C for reaction Prepare the prepolymer after 2 hours, then lower the temperature to 50-60°C, add 5% dehydrated rutile titanium dioxide, 40% filler talcum powder, 0.5% ultraviolet absorber UV327, 0.5% antioxidant 168 and 4% latent curing agent Carbamate diazolidine HardenerVPLS2959, after stirring for 0.5h, it is discharged to form a finished product, and then reacts to form a film by contacting with moisture in the air.

Embodiment 3

[0049] Add 20% xylylene isocyanate or 20% 4,4 dicyclohexylmethane diisocyanate into the reaction kettle, heat up to 50-60°C, then add 40% amino-terminated polyether D2000 to remove moisture, drop After the addition, heat up, keep warm at 80°C-120°C for 2 hours to prepare the prepolymer, then cool down to 50-60°C, add 10% dehydrated rutile titanium dioxide, 20% filler talc powder, 0.2% ultraviolet absorber UV531 , 0.2% antioxidant 168 and 9.6% latent curing agent urethane diazolidine HardenerVPLS2959, after stirring for 0.5h, the material is discharged to form a finished product, and then reacts to form a film by contacting with moisture in the air.

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Abstract

The invention relates to the technical field of polyurethane coatings, in particular to a moisture-curable one-component exposure-type polyurethane and a preparation method thereof. The moisture-curable one-component exposure-type polyurethane comprises fatty-group isocyanate, amine-terminated polyether, a latent curing agent, titanium dioxide, a filling material, an ultraviolet light absorber and an antioxidant. The preparation method comprises the following steps: dripping amine-terminated polyether subjected to vacuum dehydration into the fatty-group isocyanate, performing heat preservation when heating is carried out to obtain a prepolymer through polymerization, then sequentially adding dehydrated titanium dioxide, the filling material, the ultraviolet light absorber, the antioxidant and the latent curing agent into the prepolymer, uniformly stirring to form a finished product, and enabling the finished product to be in contact with and react with moisture in air to form a film. According to the method, the fatty-group isocyanate and the amine-terminated polyether are utilized, and the prepared polyurethane has the characteristics of compactness, high strength, high elasticity, wear resistance and corrosion resistance, is foamless, avoids yellowing, and can be applied to outdoor protective coatings. The fatty-group isocyanate and the latent curing agent have an excellent storage effect, and the storage period of the fatty-group isocyanate and the latent curing agent is longer than six months.

Description

technical field [0001] The invention relates to the technical field of polyurethane coatings, in particular to a moisture-curing one-component exposed polyurethane and a preparation method thereof. Background technique [0002] Polyurethane coatings have excellent properties such as high strength, high elasticity, wear resistance, corrosion resistance and water resistance, and have a wide range of applications. Polyurethane coatings are divided into one-component and two-component components. One-component moisture-curing coatings are easy to use, but moisture-curing one-component coatings are often produced with aromatic isocyanates (TDI, MDI). The coating is not weather-resistant and will turn yellow quickly. However, the reactivity between aliphatic isocyanate and polyol compound is very low, and the mechanical properties of the cured product are poor. [0003] The film-forming mechanism of moisture-curing one-component polyurethane coatings is that the coating contains...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/73C08G18/75C08G18/66C08G18/50C08G18/38C08G18/10C09D175/08C09D7/12
CPCC08G18/10C08G18/5021C08G18/6685C09D175/08C08G18/3831
Inventor 彭松涛田继斌李建芳
Owner HEBEI YUYANGZELI WATERPROOF MATERIAL
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