JPS60168771A - Precoating powder coating composition giving unique pattern - Google Patents

Abstract

PURPOSE:To provide a precoating powder coating compsn. which gives a coating film having a unique pattern such as an uneven pattern and excellent impact resistance, etc., by mixing a polyester resin powder coating compsn. having a specified composition with an acrylic resin powder coating compsn. CONSTITUTION:A polyester resin, which has a weight-average MW of 1,000- 30,000 and a hydroxyl value of 10-200 and is solid at room temp., is mixed with a hardener capable of forming isocyanate group (e.g. isophorone diisocyanate) to prepare a polyester resin powder coating compsn. Separately, an acrylic resin which has a weight-average MW of 3,000-30,000 and a glycidyl equivalent of 200-1,500 and is solid at room temp., is mixed with a polycarboxylic acid (e.g. sebacic acid) to prepare an acrylic resin powder coating compsn. The polyester resin powder coating compsn. is mixed with the acrylic resin powder coating compsn. in a weight ratio of 100:0.1-4.5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder @ thorn composition for pre-coating that gives a special pattern to the surface of a coating film.

Powder coatings have many advantages in terms of being non-polluting and labor-saving.
J.I. has recently been working on the workability of powder coatings
The application field for precoding, in which XR boards (J boards or coils) are coated and baked in advance for processing in order to increase the coating efficiency, is washing machines,
It has been used in refrigerators and some of the old house linings.

Compared to conventional solvent-based paints, pre-coated paint films made from powder paints are more beautiful, have better corrosion resistance, and are superior in processability (=J adhesion &1), but they also have a higher quality surface finish. There was a demand for something with a sense of texture, and it became necessary to develop a powder paint for pre-coat with a special pattern such as an uneven pattern and a merton finish.

About special pattern finishing with powder paint K, '4''
+ Publication No. 48-7492 "Powder coating composition giving surface pattern" has a particle size distribution of 100 particles/unit or less and 25
(The melt viscosity at a temperature of 1'C or less is powder coating with a particle size of 1000 voids or more and the particle size 11 is 1()0 mesh or more and 25 f)) The melt viscosity at a temperature of 1'C or more A powder coating that gives a special pattern by mixing powder coating with a particle size of 100 voids or less at a weight ratio of 0.5: IO to IO: 0.5 is known as moat.
No. 686 "Patterned Powder Coating" has an average particle size of 2007 t/U or less and OL1~25 t)'
Powder coatings with a melt viscosity at C of less than fl and 05°1 in double positive ratio
Powder coatings for pattern finishing mixed with 0 to 1 Fl: 0.5 are described, but these are not required in the market and cannot be used at all for pre-coat applications due to their greatly inferior processability and corrosion resistance. There are drawbacks.

In the present invention, Nagisa et al. have developed an aluminum ester resin thread powder paint used for pre-coating with a special pattern, and an acrylic resin powder paint that uses polyhydric carboxylic acid as a curing agent, which is incompatible with stiffness. The inventors have discovered that a powder coating composition with a certain mixing ratio is suitable for pre-coat applications that provide special patterns, and have thus come to form the present invention.

That is, the present invention is based on heavy +6-, F-equal distribution A]6. is I +
1 (1(,1~30 +10 +1, water cg base value is I
O-20tl TE 11tA -C fat-based powder 1 composition and amount = l' average molecular weight 1.4 is 3 tl fl ()
~', 4 fl 11 [10, glycidyl part is 20
0 to 1500 'r'+'+ Acrylic resin powder production 1411 composition containing 7-crystal solid acrylic resin and polyhydric carboxylic acid as 21 components in small 1'Ii part + (1
This is a powder coating composition 1 for precoding that gives a special pattern, characterized in that it is a mixture of 0:0.1 to 45%.

The unique feature of the present invention is that by mixing the incompatible polynisder resin powder NEO 1 and acrylic resin powder NEO 1, it is possible to create a coating film with a special pattern of +1, which has excellent workability. Yes! l
However, the average molecular weight of polyester resin and acrylic resin is 1 (+ (10
If it is less than 4 (l on) 61, the glass transition point (Tg) of both will be too low and it will be difficult to become solid at room temperature, and if it exceeds 3 Fl 0130, the melt viscosity of both will become large. The finished state will be poor.If the hydroxyl value of the polynisder resin is less than 10, a♂9 or 2' (1
If it exceeds 0, or if the win or loss of acrylic resin is 2
If it is less than 00 or greater than 500, the finish and performance of the coating film will deteriorate significantly. Furthermore, in order to obtain a coating film with good workability for precoating, a polyester resin powder coating and an acrylic resin powder coating are mixed in regular portions, which is not suitable for precoating.

Examples of the polyester resin used in the present invention include terephthalic acid, inphthalic acid, phthalic acid, vanillic acid, co-phosphoric acid, glitaric acid, adipic acid, sebacic acid,
Examples include β-oxyprobionic acid and oxalic acid, and examples of polyhydric alcohol components include: L-dylene glycol, propanediol, butafdiol, bentanediol,
Hegisa/Jimer, N4 Penal Glycol, 22'
-diethylpropanedi-A--, isochlorohexanedimethanol, trimethyl-propane, pentaerythript, etc., and can be easily synthesized by combining these components and subjecting them to an iCC conjugated stellation reaction.

- Examples of acrylic resins include methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl nor-acrylate, 2-j-methyl acrylate, methyl methacrylate, ethyl methacrylate, and n-butyl methacrylate. , tuttacryl itself 1 diisophyl, methacrylic acid/chlorine, styrene, and other monomers, and glyc/zyl group-containing monomers 1 For example, gurindyl acrylate, talindyl methacrylate 1
- and β-methyl, it can be easily synthesized.

In addition, as an IT7 crystal ester resin curing agent, for example, inholone diisosibrene having an innoanate group is used.
Blocks T' inocyanate groups such as ε-caglolactam, phenol, benzyl-1 alcohol, etc. Polybasic acids used as curing agents for acrylic resins include sebacic acid, brassylic acid, pimelic acid, and dobutunonoic acid. I admire things that are warm and solid.

The polyester resin powder coating and the acrylic resin powder coating used in the present invention contain colored pigments (
For example, inorganic pigments such as titanium dioxide, red iron oxide, yellow iron oxide, and carbon black, phthalo/°)'nin blue, phthalocyanine glino, Cylindrical resin, and a certain amount of a leveling agent may be added.

In order to obtain a powder coating for pre-coating with a special pattern,
Polyester resin powder coating and acrylic resin powder/I
A molding ratio of 100 to 1 to 45 is required, and optimally 1 to 1 to 4 is desirable.Acrylic resin powder coating 11).

If the doubling yarn is 0.1 end a11, processing + (l is good, but unevenness (,,, l, various f, but processing 1?, l is greatly reduced, and it cannot be used for prerecording.

In addition, powder coatings are mainly produced using the electrostatic blowing method.
Therefore, it is preferable that the particle diameter be less than +5() or 9.

Powder coating f1 mixed and prepared as above layer 02-10
A commercially available electrostatic powder coating machine (
After being uniformly coated using a charging voltage of -50 to -90 KV) or powder coating method, it is baked for 30 to 300 seconds at 200 to 300°C in a hot air oven, infrared oven, induction heating furnace, etc. With Kesa J ceramics, a coating film with a special pattern with a coating thickness of 30 to 60 μm is formed.

With the powder coating composition of the present invention, the resulting coating film has excellent appearance, anti-corrosion properties, processability, hardness, surface weatherability, etc. as a N film.
It does not have the drawbacks of the conventional powder coating X1, such as being able to obtain special patterns but not being able to use it for pre-recording, or having the performance for bullets but not being able to obtain special patterns. This is an industrial grade product that can be used for pre-recording and produces a beautiful coating film with a special pattern.

Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples. In the example, part is weight fl: 3XIX.

Examples-] 71-Lyester resin powder coating (component) Ester resin ER6610) 580 parts Adduct H-1065*2)l 2. Op titanium dioxide 30. fIn total 1 0 1), (L u Acrylic resin powder coating (B component) Aromatex PD 6200'') 135, oftls Dodenonone diacid 13. (L n Carbon black 2.0 tr Old I O + 1. fl rr 14 *l) rj genuine ester (made of barrel, polynisder resin, hydroxyl value 30, nail report:'17 average molecular weight 50 tI O *2
) H:l Luss Co., Ltd., Pro 7 Quinn Annee
725, nail '111-prison uniform molecule 1□11 1 4 [l
O +'+: i, 8: l'y', 1, and 13 components were mixed uniformly for about 1 minute using a Henfermi Giza (manufactured by Mitsui Miike (Yuki)), and then mixed at 80 to + 00'c. Press I under the temperature conditions.
I-! / kneading machine (manufactured by Busu Co., Ltd., Busco Kneader PR46
), and after cooling, finely pulverize it with a hammer-equipped pulverizer and pass it through a sieve. Apply body paint in the M position (
After uniformly mixing 1:1, it was electrostatically sprayed onto a galvanized steel plate with a thickness of 027fnffl and heated in a hot air oven.
'C(i (Film IL9.41 when fired for 1 second) 7L
A beautiful hammertone finish with a black uneven pattern on a white background was obtained, but this coating showed sufficient performance for Breco-1, and the 10° coating performance is shown in Table 1. show.

Example-2 Using the powder coating of A component and B component obtained in Example-1, coating was carried out in exactly the same manner as in Example-1 except that the mixing ratio was f: + +10:3, The coating film of JL has a black uneven pattern on a white background.
It had a beautiful paint film and had excellent performance as a pre-recorder.

The coating film performance is shown in Table 1.

Example-3, 1myl ester wood-based powder coating 1'l (Δ component) Phi/Dick M-802F1''> 800 parts Adduct B 1530'') I 6.5 u horn pump rack 2C)〃 Epiyo 1. . . , -*J 1, 5 II Ftl l (10, Fl rt Acrysono resin powder coated wood, (B component) Phi/Dic A-2238'') (]880 parts decanedioic acid 12. On New oxidation group゛tan 211.11 trj!l' 1
(10, On Ql]i++) Dainichi Ink Chemical Industry (manufactured by 423, polyester resin, hydroxyl value 40. Nail 1..j, ,'j
y, average molecular weight 4 Fl +1 (+ J: 2) Manufactured by Hüls, Block-in/Anne-1: 14'l) Oil-based shellfish dried/(11G '4("
4, Engineering, 1N xy + 11 + Fat 1 + 1) No\IJ Hon Ink Kagaku Kogyo (...), Acrylic (☆l 1lii, Chestnut/Jill: i:', 630,
city; 11 average minute 1”, if, 'I'J O(l
t1A component and B component were mixed and kneaded in the same manner as in Example-1.
4) Component A and 13 components are crushed and sieved.

Each powder coating was mixed at a ratio of 2 FlO: 2 in a heavy-duty chamber, electrostatically coated on a 0.27+im thick galvanized steel plate, and heated in a hot air oven for 45G at 2 (ioT). When you start,
T8 and Jt are gummy coatings that have a thickness of 4 U/l and are suitable for hammered finish pre-recording with white uneven patterns on a black background.

The coating film performance is shown in Table 1.

Example-4 Painting was carried out in exactly the same manner as in Example-3, except that the A and B component powder coatings obtained in Example-3 were used at a mixing ratio of +00:4. The resulting 1940μ paint film has a hammerton finish with a white uneven pattern on a black background and has the performance of a pre-recorded paint film. is.

The coating film performance is shown in Table 1.

Comparative Example-j Using the powder coating of component A and component B obtained in Example-1, coating was carried out in exactly the same manner as in Example-1, except that the mixing ratio was too 15 at the nail reach. The coating film with a thickness of 40 μm obtained by baking had a beautiful hammertone finish with an uneven pattern, but the physical properties for prerecording were poor and it could not be used.

The coating film performance is shown in Table 1.

Comparative Example-2 Using the powder coating X.1 of the A component and the B component obtained in Example-1, the combined ratio of 6L was 1 ton - 1 part and I O+1: !
'i (+) In addition to mixing, the film was painted in exactly the same manner as in the actual Mli example-1 and baked once.
The uneven pattern of the 17t paint film was somewhat lockless.]・
With the paint film on the merton, the situation as a bu 2 1 - river is also greatly low 1 ゛, and it is ktl'' (+l 1i 4 river)
It was impossible.

A9i film 171: tit: S=21';-Table K
Show-r.

Comparative Example-5 Powder coating of A component and B component prepared by iU in Example-1
1, mix (in the heavy part) Fl fl:
(1, +15 was mixed, and 1 was painted in exactly the same manner as in Example-1, and baked].) The film thickness obtained was 4.
The JL paint film had an uneven pattern and an unclear hammertone finish, making it impossible to form a beautiful paint film.

The coating film performance is shown in Table 1.

As is clear from Table 1, Examples 1 to 4 of the present invention have a hammertone finish with a beautiful uneven pattern on the coating surface.
In addition, it is necessary for pre-recording. Itk item 41 (
Impact resistance, bendability) and corrosion resistance (salt spray resistance)
However, in Comparative Examples 1 to 3, there were variations in coating film appearance and physical properties, and the corrosion resistance was also poor.

Patent applicant: NOF Corporation

Claims (1)

[Claims] A polyester resin powder coating composition having an MM average molecular weight of 1,000 to 3oooo and a hydroxy acid main component, and a weight average molecular weight of 3,000 to 30,000. Glycidyl equivalent is 2 ()
An acrylic resin that is solid at room temperature at 0~+500 and an acrylic resin powder coating composition containing a polyhydric carboxylic acid as a main component are mixed in an amount of 1 part by weight at an O of 0.1 to 45. A powder coating composition for precoding that gives a special pattern characterized by a texture.