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Special heat transfer printing powder coating for aluminium profile

Powder coating, often referred to as dry paint, is an environmentally friendly product that can provide more variety and more colors. We see more and more industries, more and more applications in the field of powder coatings. With the rapid development of aluminum industry, powder coating applied to aluminum profile has become a professional branch, and gradually replace the electrophoresis paint and fluorocarbon paint. With the emergence of transfer technology, but also to make aluminum powder coating more colorful.

Aluminum requires high strength weathering resistance and decoration, therefore, must be carried out on the aluminum surface treatment, surface treatment of aluminum is mainly organic coating, powder coating, which comprises spraying fluorocarbon paint spraying and wood processing, wood processing and also in powder coating. Wood processing technology is divided into two kinds of water transfer and heat transfer, the technology since late 90s in China, in recent years, with the rapid development of. Its main feature is the transfer of image color, rich layers, the effect can be comparable with the printing, and the difference in thermal transfer printing is at high temperature to heat sublimation heat transfer printing ink, can a multicolor pattern map, no color printing, sublimation is formed after the pattern of bright colors, and can penetrate into the powder the internal coating of 40~60 micron. So, the heat transfer products are durable, will not fall off, cracking and fading pattern. Not due to heat transfer and change the original gloss, abrasion resistance, weather resistance, acid and alkali resistance, thermal transfer is only to play the effect of surface decoration. The entire heat transfer industry, and now basically has developed into a complete set of supporting systems, including powder coating, spraying process, heat transfer machine, transfer paper and transfer film manufacturing.

The appearance of thermal transfer technology has also brought new challenges to the powder coating. It requires the powder coating, which must be matched with the heat transfer paper and film, in order to get a good transfer effect. Therefore, it is very necessary to study the heat transfer process of powder coating and the formulation design of heat transfer printing powder coating.

2 heat transfer technology

Heat transfer is also known as sublimation, portrait, landscape, wood, marble, three-dimensional relief etc. any graphics, the use of heat transfer ink on high precision paper, and then after the corresponding heat transfer equipment, heating to a certain temperature in a short period of time, the paper on the image, color, lifelike to transfer to the a special process of aluminum material.

2 heat transfer technology

3.2.3 polyurethane suboptical wood powder coating formulation

Hydroxyl resin (high hydroxyl value) 200, hydroxyl resin (low hydroxyl value) 460, B1530 310, leveling agent 20, barium sulfate 270, R902 240, other auxiliary agent 30, pigment amount.

Thermal curing conditions: 200 degrees /10min thermal transfer conditions: 180 degrees /5min gloss (60 degrees) 6%

4 factors affecting the effect of texture clarity

4.1 physical delustrant ki1099 SA206 3329 on the grain resolution effect

Physical delustrant ki1099 SA206 3329 influence on grain definition in Table 1 can be seen from table 1, the matting agent has certain effects on the wood texture, especially how much amount, adding larger amounts of wood texture is not clear.

Table 1 Physical extinction agent ki1099, SA206 and 3329 for grain clarity effect

Material 2# 3# 4# 5# 6# 1# 7# 8# 9#

Kil009 91215

SA206

7911

Three thousand three hundred and twenty-nine

81012

Conclusion good and bad

Note: the "excellent" said clear wood; "good" and "bad" said wood fuzzy; said grain clarity is poor

4.2 6600A polyester and catalyst effect on grain clarity of collocation

6600A polyester catalyst and the effect on grain clarity of collocation is shown in table 2. It can be seen from table 2 in the conclusion, the variety and amount of catalyst has great influence on grain clarity.

Influence of the amount of wood filler 4.3 definition

The influence of adding filler on the formalization definition table 3 table 3 from the conclusion we can see that the filler content also have effect on the grain clarity, but not The more, the better.

Effect of 4.4 different manufacturers of polyester resin grain clarity

Effect of different manufacturers of polyester resin grain clarity is shown in table 4. The conclusion can be seen from table 4, different manufacturers of polyester on grain clarity is influential.

Effect of 4.5 hydroxyalkylamide curing agent HAA on the formalization definition

Effect of hydroxyalkylamide curing agent HAA on grain clarity of table 5 conclusions can be seen from table 5, HAA curing agent has little effect on grain clarity.

4.6 effect of wax powder on grain clarity

Effect of wax powder on grain clarity in Table 6 from table 6 conclusions can be seen in different varieties of wax powder without much impact on wood texture.

Effect of 4.7 varieties of grain packing definition

The effects of filler varieties on the grain definition in Table 7 can be seen from table 7, choose different barium sulfate or calcium carbonate, of wood

Table 2 6600A polyester catalyst and the effect on grain clarity of collocation

Material 11# 12# 13# 14# 15# 10#

CY168 1.2 1.5 0.9

SA316

0.5 0.7 0.3

Conclusion good or bad is good or bad.

Table 3 Effect of filler amount on grain clarity

Material 17# 18# 16#

W-44HB barium sulfate 80100120

Conclusion good and good

Table 4 Effect of different manufacturers of polyester resin for grain clarity

Material 20# 21# 22# 19#

A plant polyester resin 210

B plant polyester resin

Two hundred and ten

C plant polyester resin

Two hundred and ten

D plant polyester resin

Two hundred and ten

Conclusion the advantages and disadvantages

Table 5 Effect of hydroxyalkylamide curing agent HAA on the formalization definition

Material 24# 25# 26# 27# 23#

HAA curing agent 11

Thirteen

151719

conclusion

Superior and inferior:

25# - 26# - 27# - 24# - - 23#

Table 6 Effect of grain clarity of wax powder

Material 29# 30# 28#

821 wax 1

M1# wax

Zero point three

3920 wax

One

Conclusion the advantages of good

Table 7 Effect of grain filling variety definition

Material 32# 33# 34# 35# 31#

1# barium sulfate 150

2# barium sulfate

One hundred and fifty

3# barium sulfate

One hundred and fifty

Precipitated barium sulfate

One hundred and fifty

501 calcium carbonate

One hundred and fifty

conclusion

Superior and inferior:

34# - 32# - 31# - 35# - - 33#

Texture clarity has a certain effect.

Effect of 4.8 leveling agent on the definition of grain

Effect of leveling agent on the pattern definition table 8 Table 8 from the conclusion we can see that the influence of different kinds of leveling agent and the amount of grain clarity is not too big.

4.9 of the grain clarity degassing agent

Effect of wood degassing agent definition table 9 Table 9 from the conclusion we can see that the effect of degassing agent variety and addition amount of grain clarity is not too big;

4.10 titanium dioxide filling amount of influence on grain clarity

Titanium dioxide filling amount of influence on grain clarity. From table 10 the conclusion we can see that the great influence amount of titanium dioxide on the formalization definition, should add some less.

Effect of the above ten kinds of materials on the heat transfer of powder coating grain clarity conclusion, is obtained by the test and production practice, the production process and test conditions, but also influenced by the differences in the quality of the selected materials, therefore, that conclusion is not totally correct, for reference only.

Table 8 Effect of leveling agent on the definition of grain

Material 37# 38# 39# 36#

PV88 45

208 general type

2025

Conclusion UU youyou

Table 9 Effect of grain clarity degassing agent

Material 41# 42# 43# 40#

1.2.

Degassing agent

Conclusion UU youyou

Table 10 effect of titanium dioxide on the definition of grain filling amount

Material 45# 46# 44#

902 titanium dioxide 10% 20% 5%

Conclusion good and bad

5 reasons for the quality problems of heat transfer

The reasons for the quality problems of heat transfer are shown in table 11.

Table 11 cause analysis of heat transfer printing quality

Quality problem analysis

After thermal transfer, there is no good reason to take off the phenomenon of paper or film

Is transferred to the surface of the substrate has quality problems, such as the temperature is not high temperature, there is a sticky paper or mucous membrane phenomenon, etc..

In powder, powder is surface layer transfer substrate is not completely cured, resulting in heat transfer when curing again.

Such as the use of heat transfer glue, heat transfer glue, the quality of the ratio of concentration and the amount of coating and other factors will directly affect the paper.

Such as the use of heat transfer glue, it is recommended in the heat transfer glue in the appropriate addition of the form (also known as silicone oil), can solve the phenomenon of paper out of paper.

Thermal transfer printing paper or thermal transfer printing film is fragile or zoom phenomenon is usually the temperature too high or too long to transfer the heat transfer printing paper or thermal transfer film too fast aging caused by.

Color difference of the same kind of thermal transfer printing paper or thermal transfer film

Colorimetric, did not comply with the "contrast samples the same texture, the same position, substrate transfer conditions and the same transfer in the same background, in the same light source under the condition of color contrast ratio. Transfer substrate has a color difference. Transfer device performance is not stable.

The heat transfer process, the transfer is not good control of temperature and time, usually transfer at a temperature of 120 DEG to 190 DEG C when the temperature and time of transfer and transfer is proportional to the depth of color texture, otherwise, not lower than the temperature of 120 DEG C transfer transfer transfer; when the temperature higher than 190 DEG C, with the the passage of time, gradually make the transfer to the substrate on the light color of the texture.

Effect of powder coating on transfer quality

Transfer product substrate. The surface quality is good or bad, will directly affect the final product transfer printing effect and weatherability, spraying, powder to choose good weatherability, usually followed by polyester, polyurethane, coating thickness is 60 more than pan.

Transferred coating appearance effect is very important, such as smoothness, gloss, color and so on, will directly affect the effect of substrate surface after the transfer, if the surface is smooth transfer substrate is high, after transfer of products is also high light.

Table 11 cause analysis of heat transfer quality problem (Continued)

Quality problem analysis

After heat transfer, the product appears spots or the phenomenon of mist block

The surface of the substrate is transferred to the original spot or mist block.

Is transferred to the surface of the substrate is not high temperature, there is a phenomenon of sticky paper or mucous membrane.

By spraying layer on the surface of the substrate transfer is not cured.

Such as the use of heat transfer glue, heat transfer glue, the quality of the ratio of concentration and the amount of coating and other factors will cause this phenomenon, the normal heat transfer glue in the high temperature will automatically evaporate, leaving no trace.

Such as the use of thermal transfer paper glue caused by this phenomenon, depending on the actual situation, suggestions can be transferred to the substrate has been cleaned with water or sent to the oven for a short baking way to remedy.

Such as the use of heat transfer film caused by this phenomenon, it is recommended to use low concentrations of acetone and other organic solvents to remedy the way.

Product surface color is not uniform or have a deep reason

The contact surface of transfer paper or transfer film and not close to or inadequate, such as baking, transfer paper is tilted, or vacuum, the leakage phenomenon of tubular bag.

The temperature of different position in the oven is not the same or not.

The substrate into the oven, the different position is not the same time into the box, resulting in some parts of the substrate relative to other parts of the transfer of a long time.

Transfer coating glue, glue can not be evenly coated, "fly glue (adhesive poly)" phenomenon, so that the transfer paper cannot completely close to the aluminum profile.

6 Conclusion

Application of heat transfer technology in aluminum, no doubt to the exclusive aluminum powder coating brought infinite vitality, rich and colorful of powder coatings. Many powder coating production plant has set up a special research team and specialized production workshop, there are a lot of professional production plant. These to expand the heat transfer technology to promote the development of aluminum profiles for the development of powder coatings, has played a positive role. However, we also see the paper tearing problem is also troubled by some manufacturers. I have been to some paint powder coated aluminum profile factory, aluminum stickers and vacuum pumping process is very smooth, but the paper process is traffic jam, most of the staff are gathered in the paper and the final surface cleaning process. How to make the process simple and smooth paper, powder coating formulation design to explore, to study on coating process of powder paint, ink pattern on the wood grain paper are also worthy of attention.

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