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Low energy uv curing polyurethane acrylate prepolymer and its preparation method and uv curing coating

A polyurethane acrylate and acrylate technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of strong odor and insufficient storage stability, and achieve the effects of good toughness, fast UV curing speed and stable storage.

Active Publication Date: 2022-01-28
河源然生新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide low-energy UV curing polyurethane acrylate prepolymer and its preparation method and UV curing coating, aiming to solve the problem of introducing mercaptan in polyurethane acrylate prepolymer in the prior art. After that, there is a problem of strong odor or insufficient storage stability

Method used

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  • Low energy uv curing polyurethane acrylate prepolymer and its preparation method and uv curing coating
  • Low energy uv curing polyurethane acrylate prepolymer and its preparation method and uv curing coating
  • Low energy uv curing polyurethane acrylate prepolymer and its preparation method and uv curing coating

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preparation example Construction

[0048] Further, the present invention also provides the preparation method of described low-energy UV curing urethane acrylate prepolymer, comprising the following steps:

[0049] A) Vacuum dehydrate the diol polymer, lower the temperature to 40-60°C, add an organotin catalyst and stir well, add diisocyanate dropwise to it, and keep warm at 40-60°C until the NCO value is the initial (50± 1)%.

[0050] B) Add carboxyl-containing chain extender and stir well, heat up to 60-80°C to react until the NCO value is (25±1)% of the initial value, then cool down to 50-60°C.

[0051] C) Add acrylate end-capping agent, mercaptan end-capping agent and polymerization inhibitor, keep warm at 60-80°C, and stop the reaction until the NCO value is below 0.1%, to obtain a low-energy UV-curable polyurethane acrylate prepolymer.

[0052] Wherein, in step A, the process of vacuum dehydration may be vacuum dehydration at 105° C. for 2 hours. Preferably, after the diisocyanate is added dropwise, the...

Embodiment 1

[0057] In parts by weight, vacuumize 100 parts of polytetrahydrofuran glycol PTMG (BASF PolyTHF250, relative molecular weight 250) at 105°C for 2 hours to remove the moisture, then cool down to 40°C, add 0.1 part of dibutyltin dilaurate and stir well , 135.5 parts of 1,6-hexamethylene diisocyanate was added dropwise thereto, and after the temperature became constant, the reaction was maintained at 40°C until the NCO value was (50±1)% of the initial value.

[0058] Add 30 parts of dimethylolbutyric acid and stir evenly, raise the temperature to 60°C to react until the NCO value is (25±1)% of the initial value, and then cool down to 50°C.

[0059] Add 16 parts of hydroxyethyl acrylate, 21 parts of 2-mercaptoethanol and 0.3 parts of hydroquinone, keep the temperature constant at 60°C for reaction, stop the reaction until the NCO value is below 0.1%, and obtain low-energy UV-curable polyurethane acrylate prepolymer.

[0060] In the present embodiment, according to above raw mater...

Embodiment 2

[0063] In parts by weight, vacuumize 100 parts of polycarbonate diol PCDL (Ube UBE PH100, relative molecular weight 1000) at 105°C for 2 hours to remove the moisture, then cool down to 60°C, and add 0.1 part of dibutyltin diacetate Stir well, add 44.5 parts of isophorone diisocyanate dropwise to it, wait for the temperature to be constant and keep it warm at 60°C to react until the NCO value is (50±1)% of the initial value.

[0064] Add 7.5 parts of dimethylolbutyric acid and stir well, raise the temperature to 80°C for reaction until the NCO value is (25±1)% of the initial value, and then cool down to 60°C.

[0065] Add 10.7 parts of hydroxypropyl methacrylate, 3.6 parts of 6-mercapto-1-hexanol and 0.15 parts of p-hydroxyanisole, keep the temperature constant at 80°C for reaction, and stop the reaction until the NCO value is below 0.1%. Energy UV curable urethane acrylate prepolymer.

[0066] In the present embodiment, according to above raw material, the theoretical structu...

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Abstract

The invention discloses a low-energy UV-curable polyurethane acrylate prepolymer, a preparation method thereof, and a UV-curable coating. In parts by weight, the raw materials of the prepolymer include: 100 parts of diol polymer, 35-150 parts of diisocyanate 6-37 parts of carboxyl-containing chain extender, 5-40 parts of acrylate end-capping agent, 3-30 parts of mercaptan end-capping agent, 0.1-0.5 parts of polymerization inhibitor, and 0.1-0.5 parts of organotin catalyst. The prepolymer provided by the invention contains a mercapto group, which can effectively overcome oxygen inhibition, requires less energy for curing, and at the same time, the carboxyl group can inhibit the Michael addition reaction of the mercapto group and acrylate. The prepolymer has the advantages of fast UV curing speed, good toughness and stable storage.

Description

technical field [0001] The invention relates to the field of photocurable prepolymers, and mainly relates to low-energy UV curable polyurethane acrylate prepolymers, a preparation method thereof and UV curable coatings. Background technique [0002] UV curing prepolymer is the most important component in photocuring products, which determines the basic performance of products after curing. Due to its highly adjustable structure and properties, urethane acrylate is the most widely researched and used prepolymer in photocurable products. Conventional urethane acrylate has a slow curing speed under low-energy-density UV lamps, poor surface-drying effect, and sticky surface, which affects use. The common way to increase the curing speed of urethane acrylate is to increase its functionality, but the problem is that the hardness increases and the toughness deteriorates after curing. Another method is to add active amines, but the products tend to be seriously yellowed and affect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/67C08G18/10C08G18/73C08G18/75C08G18/32C08G18/34C08G18/66C08G18/42C08G18/44C08G18/48C08G18/38C09D175/16
CPCC08G18/672C08G18/10C08G18/73C08G18/755C08G18/758C08G18/3206C08G18/44C08G18/4277C08G18/673C08G18/4854C08G18/4238C09D175/16C08G18/348C08G18/288C08G18/6659C08G18/6692
Inventor 欧龙生邹名超陈文标
Owner 河源然生新材料有限公司
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