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Low-surface-energy polyurethane photocureable coating and preparation method thereof

A light-curing coating, low surface energy technology, applied in the coating and other directions, can solve the problems of poor compatibility between fluorine-containing small molecules and resins, the performance of the coating film cannot be effectively improved, and the coating is easy to mix unevenly. Separation, not easy to precipitate crystals, low energy consumption

Active Publication Date: 2015-07-29
国科广化(南雄)新材料研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method of physical doping can achieve the effect of reducing the surface energy, the compatibility of small fluorine-containing molecules with resins is poor, and the coating is prone to uneven mixing and phase separation, which leads to the inability to effectively function and the coating film. Performance cannot be effectively improved

Method used

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  • Low-surface-energy polyurethane photocureable coating and preparation method thereof
  • Low-surface-energy polyurethane photocureable coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] Preparation of hydroxy (meth)acrylate single-terminated polyurethane oligomer: polyether PEG400 (molecular weight: 400) was vacuum-dried in a vacuum oven at 120° C. to remove water for 4 hours. According to the weight ratio, heat up 100 parts of dehydrated polyether PEG400 to 65°C, then add 25 parts of isophorone diisocyanate, mix evenly under the condition of stirring, heat up to 70°C, and react for 6 hours to obtain the end group as - NCO-polyurethane prepolymer; then add 8 parts of hydroxyethyl methacrylate to block part of the -NCO-group, and react at 80°C for 4h to obtain hydroxyethyl methacrylate single-blocked polyurethane oligomer object PU1.

[0038] The preparation of the fluorine-containing (meth) polyacrylate prepolymer solution of mercaptoethanol single end-capping: by weight, with 100 parts of trifluoroethyl methacrylate, 2 parts by weight of mercaptoethanol, 100 parts of dioxane ring, 2 parts of azobisisoheptanonitrile were stirred and mixed evenly, and ...

Embodiment 2

[0043] Preparation of hydroxy (meth)acrylate single-terminated polyurethane oligomer: polyether N210 (molecular weight: 1000) was vacuum-dried in a vacuum oven at 120° C. to remove water for 4 hours. According to the weight ratio, heat up 100 parts of dehydrated polyether N210 to 60°C, then add 25 parts of toluene diisocyanate, mix evenly under stirring, heat up to 70°C, and react for 6 hours to get the terminal group -NCO- The polyurethane prepolymer; then add 26 parts of hydroxyethyl acrylate to block part of the -NCO-group, and react at 70°C for 5h to obtain the polyurethane oligomer PU2 which is mono-blocked by hydroxyethyl acrylate.

[0044] The preparation of the fluorine-containing (meth) polyacrylate prepolymer solution of mercaptoethanol single-termination: by weight, with 100 parts of dodecafluoroheptyl methacrylate, 10 parts by weight of mercaptoethanol, 100 parts of xylene, Stir and mix 3 parts of azobisisovaleronitrile evenly, heat up to 100° C. and react for 10 h...

Embodiment 3

[0049] Preparation of hydroxy (meth)acrylate single-terminated polyurethane oligomer: polyether PEG300 (molecular weight: 300) was vacuum-dried in a vacuum oven at 120° C. to remove water for 4 hours. According to the weight ratio, heat up 100 parts of dehydrated polyether PEG300 to 58°C, then add 20 parts of diphenylmethane diisocyanate, mix evenly under stirring, raise the temperature to 75°C, and react for 5 hours to obtain the end group as - NCO-polyurethane prepolymer; then add 10 parts of hydroxypropyl methacrylate to block part of the -NCO-group, and react at 90°C for 3 hours to obtain a single-capped polyurethane oligomer of hydroxypropyl methacrylate object PU3.

[0050] The preparation of the fluorine-containing (meth) polyacrylate prepolymer solution of mercaptoethanol mono-capping: by weight, with 100 parts of hexafluorobutyl methacrylate, 5 parts by weight of mercaptoethanol, 100 parts of ethylene glycol mono Methyl ether and 2.5 parts of azobisisobutyronitrile w...

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Abstract

The invention belongs to the technical field of polyurethane coatings and discloses a low-surface-energy polyurethane photocureable coating and a preparation method thereof. The coating comprises the following components in parts by weight: 100 parts of a low-surface-energy polyurethane prepolymer, 0.01-50 parts of an active diluent, 0.5-10 parts of a photoinitiator and 0.5-10 parts of an assistant. A fluorinated acrylate modified polyurethane polymer is synthesized with a chemical method, and high-fluorine-content polyurethane with relatively uniform phase distribution is obtained, unlikely to be separated, unlikely to be separated out and crystallize and made into the photocureable coating. The coating has the characteristics of a fluorinated compound and polyurethane, has excellent performances such as water resistance, oil resistance, acid and base resistance, chemical corrosion resistance and the like as well as good adhesion, can be quickly cured through ultraviolet irradiation and is improved in cohesion. With the adoption of ultraviolet curing, the preparation method has the characteristics of low energy consumption, environmental protection, energy conservation and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of polyurethane coatings, in particular to a low surface energy polyurethane light-curing coating and a preparation method thereof. Background technique [0002] UV-curable coatings have the advantages of low pollution, fast curing, energy saving and high efficiency, and are widely used in wood, metal, ink printing, plastic coating, optical fiber coating, fabric printing, etc. Polyurethane coatings are the most widely used UV-curable coatings, with high peel strength and bonding strength, excellent low temperature resistance, impact resistance, oil resistance and wear resistance. The excellent properties of UV-curable polyurethane coatings make them widely used in waterproof coatings and other fields. However, due to the increasingly high requirements for waterproof and oil-proof performance in various industries, a single polyurethane can no longer meet the needs of practical applications. At present, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D4/02C09D4/06C09D7/12C08F299/06C08G18/67C08G18/48C08F120/22
Inventor 刘伟区王红蕾
Owner 国科广化(南雄)新材料研究院有限公司
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