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High-functionality polyurethane acrylate as well as preparation method and application thereof

A polyurethane acrylate, high-functionality technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problem of poor adhesion and reaction rate of polyurethane acrylate, poor flexibility of polyurethane acrylate, and can not be used outdoors for a long time and other problems, to achieve the effect of excellent pencil hardness, excellent yellowing resistance, and accelerated curing speed

Pending Publication Date: 2021-12-24
上海都昱新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional urethane acrylate has the characteristics of poor yellowing resistance, poor aging resistance, and poor chemical corrosion resistance, and cannot be used outdoors for a long time; at the same time, it still has the disadvantages of slow curing rate, high viscosity, and poor mechanical properties. limit its scope of application
[0004] Chinese patent CN102585157A discloses a preparation method of UV-cured multifunctional polyurethane acrylate vacuum coating topcoat resin, wherein aliphatic diisocyanate, polyol triacrylate, trihydric alcohol, absolute ethanol, initiator, barrier Polyurethane acrylate synthesized from raw materials such as polymerizing agent has good texture, good hand feeling, good chemical stability and good hardness, but the flexibility of the prepared polyurethane acrylate is not good; Chinese patent CN110294833A Disclosed is a low-viscosity UV photocurable urethane acrylate resin and a preparation method thereof, wherein the urethane acrylate synthesized from raw materials such as hydroxy acrylate, isocyanate, catalyst, polymerization inhibitor, and antioxidant has good adhesion , solvent resistance and excellent flexibility and yellowing resistance, but the hardness of the synthetic polyurethane acrylate and the curing rate of the synthetic polyurethane acrylate are low and the curing rate is slow; Chinese patent CN105461890B discloses a UV light Cured urethane acrylate and its preparation method, wherein the urethane acrylate synthesized from raw materials such as diisocyanate, 1,4-cyclohexyldimethanol, diol, polyhydroxy carboxylic acid, hydroxy acrylate, acetone, catalyst, polymerization inhibitor, etc. Ester, which has good thermal oxygen stability and high hardness, but the synthetic polyurethane acrylate has poor adhesion and reaction rate

Method used

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  • High-functionality polyurethane acrylate as well as preparation method and application thereof
  • High-functionality polyurethane acrylate as well as preparation method and application thereof
  • High-functionality polyurethane acrylate as well as preparation method and application thereof

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preparation example Construction

[0054] Second aspect of the present invention provides a kind of preparation method of high-functionality urethane acrylate, the preparation step of described urethane acrylate comprises:

[0055] (1) take isocyanate, acrylic resin, polymerization inhibitor, catalyzer of corresponding weight part;

[0056] (2) Add isocyanate and polymerization inhibitor in a four-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and then add acrylic resin and catalyst mixed solution dropwise to the system to maintain the reaction temperature at 40-50°C, After 1-2 hours of dropping, the system is slowly raised to 80-90°C after the dropping, kept for 3-5 hours, cooled to room temperature and discharged to obtain high-functionality polyurethane acrylate.

[0057] After a lot of research, the applicant found that according to the addition sequence and reaction temperature of the present invention, the performance of the polyurethane acrylate prepared when...

Embodiment 1

[0064] Embodiment 1 of the present invention provides a kind of high-functionality urethane acrylate, the raw material of described high-functionality urethane acrylate comprises, by weight, 22.3 parts of isocyanate, 63 parts of acrylic resin, 0.086 part of polymerization inhibitor, catalyst 0.0086 copies;

[0065] The isocyanate is hexamethylene diisocyanate trimer; the viscosity of the hexamethylene diisocyanate trimer at 23°C is 3000mPa·s; the hexamethylene diisocyanate trimer is German Bayer N3300;

[0066] The acrylic resin has a branched structure; the functionality of the acrylic resin is 4; the viscosity of the acrylic resin at 25°C is 1200mPa·s; the acrylic resin is pentaerythritol tetraacrylate (CAS No.: 4986-89- 4);

[0067] The polymerization inhibitor is p-hydroxyanisole (CAS No.: 150-76-5);

[0068] The catalyst is dibutyltin dilaurate (CAS No.: 77-58-7);

[0069] The preparation step of described urethane acrylate comprises: (1) take the isocyanate of corres...

Embodiment 2

[0072] Embodiment 2 of the present invention provides a kind of high-functionality urethane acrylate, the raw material of described high-functionality urethane acrylate comprises, by weight, 10 parts of isocyanate, 74.3 parts of acrylic resin, 0.086 part of polymerization inhibitor, catalyst 0.0086 copies;

[0073] Described isocyanate is with embodiment 1;

[0074] The acrylic resin has a branched structure; the functionality of the acrylic resin is 6; the viscosity of the acrylic resin at 25°C is 1200mPa·s; the acrylic resin is dipentaerythritol hexaacrylate, purchased from Tianjin Jiurixin Materials Co., Ltd.;

[0075] Described polymerization inhibitor is with embodiment 1;

[0076] Described catalyzer is with embodiment 1;

[0077] The preparation steps of the polyurethane acrylate are the same as in Example 1.

[0078] The prepared high-functionality urethane acrylate is pale yellow and transparent, with NCO%<0.05% (molar concentration), viscosity of 4200cps / 40°C and...

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Abstract

The invention relates to the technical field of surface modification, in particular to high-functionality polyurethane acrylate as well as a preparation method and application thereof. The refractive index of the high-functionality polyurethane acrylate at 25 DEG C is 1.45-1.55. The high-functionality polyurethane acrylate is prepared from the following raw materials in parts by weight: 2-30 parts of isocyanate, 60-98 parts of acrylic resin, 0.01-0.2 parts of a polymerization inhibitor and 0.001-0.02 parts of a catalyst. The high-functionality polyurethane acrylate prepared by the preparation method disclosed by the invention has relatively high curing efficiency and relatively high mechanical strength. A high-functionality polyurethane acrylic resin cured film has excellent yellowing resistance and pencil hardness, and is suitable for the fields of automobile parts, computer shells, mobile phone shells and the like.

Description

technical field [0001] The invention relates to the technical field of surface modification, in particular to a high-functionality polyurethane acrylate and its preparation method and application. Background technique [0002] Ultraviolet (UV) curing emerged in the 1960s. The principle is that under the irradiation of ultraviolet light, the photoinitiator generates active groups (usually unsaturated double bonds), and the active groups polymerize to form new polymers. . Because of its energy saving and environmental protection technology, it is widely used in the production of ultraviolet (UV) curing coatings, which are applied to the surface of various plastic parts, such as automobile parts, computer casings, mobile phone casings, etc. [0003] Polyurethane acrylate (PUA) is a type of resin widely used in UV curable coatings. It not only has good wear resistance of the cured film, but also has very little solvent volatilization during film formation, which is in line with...

Claims

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Application Information

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IPC IPC(8): C09D175/04C08G18/24C08G18/62C08G18/79
CPCC09D175/04C08G18/792C08G18/6225C08G18/246C08L75/04
Inventor 吕晨李常林
Owner 上海都昱新材料科技有限公司
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