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Preparation method for highly-weatherable ultraviolet-curable polyurethane coating

A technology of polyurethane coatings and high weather resistance, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as carbon-carbon single bond structure damage, and achieve high double bond conversion rate, good compatibility, and adhesion strong effect

Inactive Publication Date: 2018-06-08
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the main chain structure in the molecular structure of polyurethane coatings is mostly carbon-carbon single bonds, under long-term sunlight irradiation, the energy of ultraviolet rays in sunlight is relatively high, which is easy to damage the carbon-carbon single bond structure.

Method used

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  • Preparation method for highly-weatherable ultraviolet-curable polyurethane coating
  • Preparation method for highly-weatherable ultraviolet-curable polyurethane coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) 100 g of epoxy-terminated polydimethylsiloxane was uniformly dispersed in ethyl acetate by ultrasound, the dispersion system was placed in the reactor for use, the system was uniformly heated to 85 ℃, and at the same time in 5 h Slowly add 20 g of acrylic acid with 0.25 g of benzyl triethylammonium chloride (TEBA) dissolved in it, keep it for 12 hours, and adjust the acid value of the reaction system to no more than 15 mg KOH / g;

[0030] (2) Place 100 g of the acrylic modified polydimethylsiloxane obtained in step (1) in the reactor, heat the system uniformly to 30 ℃, and slowly add 50 g of 4,4'-two Phenylmethane diisocyanate and 3.5 g of dibutyltin dilaurate were reacted for 12 h to obtain a prepolymer of diisocyanate and modified organosilicon compound;

[0031] (3) Place 100 g of the prepolymer of diisocyanate and modified organosilicon compound in the reactor of step (2), heat the system uniformly to 60 ℃, and slowly add 210 g of trimethylolpropane diacrylic acid dro...

Embodiment 2

[0034] Compared with Example 1, the amount of terminal epoxy polydimethylsiloxane in the first step is changed to 105 g, and other conditions remain unchanged.

Embodiment 3

[0036] Compared with Example 1, the reaction temperature of the system in the first step was changed to 95°C, and other conditions remained unchanged.

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Abstract

The invention relates to a preparation method for a highly-weatherable ultraviolet-curable polyurethane coating. The preparation method comprises the following steps: allowing active epoxy groups located at two ends of epoxy-terminated polydimethylsiloxane to react with acrylic acid, introducing a carbon-carbon unsaturated double bond, and carrying out a reaction with isocyanate so as to prepare the highly-weatherable ultraviolet-curable polyurethane coating. The highly-weatherable ultraviolet-curable polyurethane coating provided by the invention has excellent properties like good wear resistance, chemical product resistance and oil resistance, strong adhesion force and low-temperature curability of a polyurethane coating; meanwhile, the coating has the characteristics of weather resistance and high-temperature resistance of an organosilicon material due to addition of an organosilicon chain into a molecular structure. The coating obtained by using the preparation method provided by the invention has good ultraviolet-curing activity, high double-bond conversion rate and good component compatibility. The preparation method provided by the invention has the following advantages: preparation steps are simple; used raw materials are frequently-used products in a coating industry; reaction conditions are mild; and a product has low comprehensive cost and is applicable to large-scale popularization and mass production.

Description

Technical field [0001] The invention relates to the technical field of polymer coatings, in particular to a method for preparing a high weather resistance ultraviolet curing polyurethane coating. Background technique [0002] Polyurethane coatings are widely used in various fields due to their good abrasion resistance, chemical and oil resistance, strong adhesion and the ability to cure at low temperatures. However, since the main chain structure in the molecular structure of polyurethane coatings is mostly carbon-carbon single bonds, under long-term sunlight exposure, the ultraviolet energy in sunlight is relatively high, which is likely to damage the carbon-carbon single bond structure. [0003] The main chain of organosilicon contains a large number of silicon-oxygen bonds, and the bond energy of silicon-oxygen bonds is relatively high. Therefore, the thermal stability and weather resistance of organic silicon products are better. At the same time, the organic silicon itself als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14C08G18/67C08G18/61
CPCC09D175/14C08G18/672C08G18/61
Inventor 杨正龙傅康裕
Owner TONGJI UNIV
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