CN114316758A - Low-temperature ultraviolet curing powder coating and preparation method and application method thereof - Google Patents
Low-temperature ultraviolet curing powder coating and preparation method and application method thereof Download PDFInfo
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- CN114316758A CN114316758A CN202111558415.7A CN202111558415A CN114316758A CN 114316758 A CN114316758 A CN 114316758A CN 202111558415 A CN202111558415 A CN 202111558415A CN 114316758 A CN114316758 A CN 114316758A
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Abstract
The invention discloses a low-temperature ultraviolet light curing powder coating, a preparation method and an application method thereof. The coating is sprayed on the surface of a base material by adopting an electrostatic spraying process, and the base material is solidified under an ultraviolet lamp after infrared melting and leveling. The invention selects the semi-crystalline/non-crystalline polymer with double bonds, can be melted and leveled at low temperature (60-75 ℃), introduces double bonds on the photoinitiator, leads the double bonds to be attached to the surface of a film forming substance to form grafting points during melting and mixing, can lead the film forming substance to be orderly copolymerized in the ultraviolet curing process, can be better attached to the surface of a base material, has the properties of high hardness, excellent scratch resistance and the like, and can be widely applied to heat-sensitive base materials such as wood, plastics, paper and the like.
Description
Technical Field
The invention relates to the technical field of powder coatings, in particular to a low-temperature ultraviolet curing powder coating and a preparation method and an application method thereof.
Background
The powder coating is a coating with 100 percent of solid content, has the characteristics of one-time film forming, large thickness, less pollution, environmental friendliness and the like, and is mainly used for coating doors and windows, enclosing walls, electric poles, guardrails and the like as well as building pipes. The powder coating is the fastest developing coating variety, is an absolute zero VOC coating theoretically, has unique advantages, and is one of the most main directions for the development of coatings after VOC can be completely abandoned in the future.
However, the prior art has certain disadvantages and limitations, such as high manufacturing cost of the coating, high baking curing temperature (generally, the curing temperature needs 180-. In order to increase the proportion of the powder coating in industrial coatings, the powder coating is developed to be cured at low temperature, made into thin films, functionalized, specialized and the like.
Patent CN101186780A discloses an ultraviolet light curing powder coating, which is composed of the following raw materials: and (meth) acrylic double-bond unsaturated polyester resin, a photoinitiator and a leveling agent are melted in an infrared melting furnace at the temperature of 90-150 ℃. Has the defects of high melting and leveling temperature, high energy consumption and the like.
Patent CN106752767A discloses a low-temperature curing powder coating, which is composed of polyester resin, epoxy resin, curing agent, ultraviolet absorbent, fast initiator, titanium dioxide, barium sulfate and leveling agent, wherein the curing temperature range is 110-150 ℃, and the powder coating has the defects of high melting leveling temperature, high energy consumption and the like.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a low-temperature ultraviolet curing powder coating.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the low-temperature ultraviolet curing powder coating comprises the following components in parts by mass:
(1) film-forming material: 50-80 parts of
(2) Modified photoinitiator: 5-15 parts of
(3) Leveling agent: 0.5 to 2 portions of
(4) Titanium dioxide: 10-25 parts of
The film forming matter is a mixture of o-benzene type unsaturated polyester resin and vinyl ether carbamate resin, and the modified photoinitiator is obtained by introducing terminal double bonds through Schotten-Baumann reaction by using a photoinitiator and a functional monomer.
Preferably, the mass ratio of the film-forming substance to the mixture of the o-benzene type unsaturated polyester resin and the vinyl ether carbamate resin is 6:4-8: 2.
Preferably, the photoinitiator is selected from one or a combination of several of 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, benzoin, 2, 4-dihydroxybenzophenone and thiopropoxy thioxanthone.
Preferably, the functional monomer is one or a combination of more of butenoyl chloride, vinylsulfonyl chloride and 2-ethyl acryloyl chloride.
Preferably, the leveling agent is a polyacrylate leveling agent.
The technical problem to be solved by the invention is as follows: provides a preparation method of low-temperature ultraviolet curing powder coating.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the preparation method of the low-temperature ultraviolet curing powder coating comprises the following steps: adding the o-benzene unsaturated polyester resin, the modified photoinitiator, the flatting agent and the titanium dioxide into an extruder, melting and mixing for 30 minutes, then adding the vinyl ether urethane resin, melting and mixing for 10 minutes, extruding after cooling, granulating, crushing particles, and finally sieving in a grading manner to obtain a finished product.
Preferably, the extruder melts and mixes the materials at a melting temperature of 65-75 ℃.
The technical problem to be solved by the invention is as follows: provides an application method of low-temperature ultraviolet curing powder coating.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an application method of low-temperature ultraviolet light curing powder coating comprises the steps of carrying out electrostatic powder spraying after the surface of a substrate to be coated with the coating is treated, then carrying out infrared melting leveling, and finally carrying out ultraviolet light curing.
Preferably, the ultraviolet light with the wavelength of 205-395 nm is adopted in the ultraviolet light curing.
The invention has the beneficial effects that:
the powder coating selects the semi-crystalline/amorphous polymer with double bonds, so that the semi-crystalline/amorphous polymer can be melted and leveled at low temperature (60-75 ℃), double bonds are introduced into a photoinitiator so that the semi-crystalline/amorphous polymer can be attached to the surface of a film forming substance to form grafting points when being melted and mixed, the film forming substance can be orderly copolymerized in the ultraviolet curing process and can be better attached to the surface of a base material, the powder coating has the properties of high hardness, excellent scratch resistance and the like, and the ultraviolet curing is adopted, so that the problem that the existing thermosetting powder coating has high curing temperature (180-200 ℃), and long curing time (15-20 minutes) can be solved, and the product can be widely applied to heat-sensitive base materials such as wood, plastic, paper and the like.
Detailed Description
Specific embodiments of the present invention are described in detail below.
Example 1
50 parts of o-benzene unsaturated polyester resin, 8 parts of modified photoinitiator, 1 part of flatting agent and 15 parts of titanium dioxide are added into an extruder to be melted and mixed for 30 minutes at 65 ℃, 26 parts of vinyl ether carbamate resin is added to be melted and mixed for 10 minutes, the mixture is extruded after being cooled, and then is granulated, and the granules are crushed and sieved in a grading way to obtain the finished product of the low-temperature ultraviolet light curing powder coating.
During spraying, after the surface of the base material is treated, electrostatic powder spraying is carried out, infrared melting and leveling are carried out, and ultraviolet curing with the wavelength of 230nm is carried out. And finally, testing the performance of the coating film.
Example 2
Adding 56 parts of o-benzene unsaturated polyester resin, 10 parts of modified photoinitiator, 1 part of flatting agent and 18 parts of titanium dioxide into an extruder, melting and mixing for 30 minutes at 75 ℃, then adding 15 parts of vinyl ether urethane resin, melting and mixing for 10 minutes, cooling, extruding, granulating, crushing particles, sieving in a grading manner, and obtaining the finished product of the low-temperature ultraviolet light curing powder coating.
During spraying, after the surface of the base material is treated, electrostatic powder spraying is carried out, infrared melting and leveling are carried out, and ultraviolet curing with the wavelength of 290nm is carried out. And finally, testing the performance of the coating film.
Example 3
60 parts of o-benzene unsaturated polyester resin, 9 parts of modified photoinitiator, 1 part of flatting agent and 10 parts of titanium dioxide are added into an extruder to be melted and mixed for 30 minutes at 70 ℃, 20 parts of vinyl ether urethane resin is added to be melted and mixed for 10 minutes, the mixture is extruded after being cooled, and then is granulated, and the granules are crushed and sieved in a grading way to obtain the finished product of the low-temperature ultraviolet light curing powder coating.
During spraying, after the surface of the base material is treated, electrostatic powder spraying is carried out, infrared melting and leveling are carried out, and ultraviolet curing with the wavelength of 365nm is carried out. And finally, testing the performance of the coating film.
The following table shows the test data for the samples obtained in 3 examples:
| test items | Sample 1 | Sample 2 | Sample 3 | Heat-curable powder coating |
| Hardness of pencil | 5H | 6H | 6H | 3-5H |
| Flatness of | 96% | 97% | 96% | 92-98% |
| Resistance to cracking | Without cracking | Without cracking | Without cracking | Without cracking |
| Scratch-resistant coating | 4 | 5 | 4 | 3-6 |
The above-mentioned embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments may be used, not restrictive; it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.
Claims (9)
1. The low-temperature ultraviolet curing powder coating is characterized in that: the composite material comprises the following components in parts by mass:
(1) film-forming material: 50-80 parts of
(2) Modified photoinitiator: 5-15 parts of
(3) Leveling agent: 0.5 to 2 portions of
(4) Titanium dioxide: 10-25 parts of
The film forming matter is a mixture of o-benzene type unsaturated polyester resin and vinyl ether carbamate resin, and the modified photoinitiator is obtained by introducing terminal double bonds through Schotten-Baumann reaction by using a photoinitiator and a functional monomer.
2. The low-temperature ultraviolet-curable powder coating according to claim 1, wherein: the film forming substance is a mixture of o-benzene type unsaturated polyester resin and vinyl ether carbamate resin in a mass ratio of 6:4-8: 2.
3. The low-temperature ultraviolet-curable powder coating according to claim 3, wherein: the photoinitiator is selected from one or a combination of more of 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, benzoin, 2, 4-dihydroxy benzophenone and thiopropoxy thioxanthone.
4. The low-temperature ultraviolet-curable powder coating according to claim 3, wherein: the functional monomer is one or a combination of more of butenoyl chloride, vinyl sulfonyl chloride and 2-ethyl acryloyl chloride.
5. The low-temperature ultraviolet-curable powder coating according to claim 1, wherein: the flatting agent is polyacrylate flatting agent.
6. The method for preparing the low-temperature ultraviolet curing powder coating according to any one of claims 1 to 5, which comprises the following steps: adding the o-benzene unsaturated polyester resin, the modified photoinitiator, the flatting agent and the titanium dioxide into an extruder, melting and mixing for 30 minutes, then adding the vinyl ether urethane resin, melting and mixing for 10 minutes, extruding after cooling, granulating, crushing particles, and finally sieving in a grading manner to obtain a finished product.
7. The method for preparing the low-temperature ultraviolet curing powder coating according to claim 6, wherein the method comprises the following steps: the extruder melts and mixes the materials at a melting temperature of 65-75 ℃.
8. The method for applying the low-temperature ultraviolet-curable powder coating according to claim 1, wherein the method comprises the following steps: after the surface of a substrate to be coated with the coating is treated, electrostatic powder spraying is carried out, infrared melting leveling is carried out, and finally ultraviolet curing is carried out.
9. The method for applying the low-temperature ultraviolet-curable powder coating according to claim 8, wherein the method comprises the following steps: the ultraviolet curing adopts ultraviolet light with the wavelength of 205-395 nm.
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| CN202111558415.7A CN114316758A (en) | 2021-12-20 | 2021-12-20 | Low-temperature ultraviolet curing powder coating and preparation method and application method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115521689A (en) * | 2022-10-17 | 2022-12-27 | 江门市久冠松高分子材料有限公司 | Photocuring powder coating and preparation method thereof |
| CN115895409A (en) * | 2023-01-04 | 2023-04-04 | 浙江双金粉末涂料有限公司 | Preparation and film forming method of low-temperature curing anticorrosive powder coating |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101186780A (en) * | 2007-10-24 | 2008-05-28 | 扬州三川实业有限公司 | Ultraviolet light solidifying powdery paints, producing method and applying method thereof |
| CN109180921A (en) * | 2018-09-11 | 2019-01-11 | 惠州市固德尔合成材料有限公司 | A kind of neighbour's benzene-type photocuring unsaturated polyester resin and preparation method thereof |
| CN111303717A (en) * | 2020-02-18 | 2020-06-19 | 吉林大学 | Preparation method of photo-initiated cross-linked anti-fog coating |
-
2021
- 2021-12-20 CN CN202111558415.7A patent/CN114316758A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101186780A (en) * | 2007-10-24 | 2008-05-28 | 扬州三川实业有限公司 | Ultraviolet light solidifying powdery paints, producing method and applying method thereof |
| CN109180921A (en) * | 2018-09-11 | 2019-01-11 | 惠州市固德尔合成材料有限公司 | A kind of neighbour's benzene-type photocuring unsaturated polyester resin and preparation method thereof |
| CN111303717A (en) * | 2020-02-18 | 2020-06-19 | 吉林大学 | Preparation method of photo-initiated cross-linked anti-fog coating |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115521689A (en) * | 2022-10-17 | 2022-12-27 | 江门市久冠松高分子材料有限公司 | Photocuring powder coating and preparation method thereof |
| CN115895409A (en) * | 2023-01-04 | 2023-04-04 | 浙江双金粉末涂料有限公司 | Preparation and film forming method of low-temperature curing anticorrosive powder coating |
| CN115895409B (en) * | 2023-01-04 | 2023-09-12 | 浙江双金粉末涂料有限公司 | Preparation and film forming method of low-temperature curing anti-corrosion powder coating |
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