A kind of vacuum plating coating and preparation thereof and constructional method
Technical field
The present invention relates to realize the electroplating coating of the metallization decorative effect of engineering plastics, especially a kind of vacuum plating coating and preparation and constructional method by technique for vacuum coating.
Technical background
The metal vacuum electroplating technology is exactly under the environment of high vacuum, with the gasification of plated film material, is deposited on a kind of technology that workpiece surface is realized metal effect by specific heating source then, divides vacuum evaporation coating and vacuum magnetic-control sputtering plated film according to the form of heating source.Because of common engineering frosting slipperiness deficiency; need a kind of priming paint coating structure to go out a slick surface; realize various metal effects, just need a kind of middle lacquer that coating is painted again, protect with finish paint at last; formation can persistent metal finishing effect; present existing solution is a solvent based coating, adopts hot baking form to solidify, and volatility is big; take energy during construction cost, human body is poisoned big.
Summary of the invention
The present invention has controlled the photocuring reaction shrinkability by rational formulating of recipe, has solved a sticking power difficult problem, but increases the reliability of finish paint again by the middle lacquer transition layer of additive color.Coating need not dilute by thinner, and directly spraying is used.
The technical solution adopted for the present invention to solve the technical problems is: described vacuum plating coating is made up of priming paint, middle lacquer, finish paint, and priming paint, middle lacquer, finish paint are by weight ratio:
Priming paint: polyurethane acrylate resin 20-25%, acrylate 20-25%, HCPK and TPO mixed light initiator 2-4%, organo-siloxane flow agent 0.5-1%, butylacetate 15-20, ethyl acetate 20-25, Virahol 10-15%;
Middle lacquer: polyester modified polyurethane acrylate resin 25-30%, polyurethane acrylate resin 5-10%, phosphoester acrylic ester 0.2-1%, HCPK and TPO mixed light initiator 0.5-1%, butylacetate 15-20%, ethyl acetate 25-30%, Virahol 20-25%;
Finish paint: polyurethane acrylate resin 25-30%, acrylate 10-15%, phosphoester acrylic ester 0.2-1%, HCPK and TPO mixed light initiator 2-4%, organo-siloxane flow agent 0.5-1%, butylacetate 15-20%, ethyl acetate 20-25%, Virahol 15-20%.
The preparation method of vacuum plating coating is:
The preparation method of priming paint is: dropped into behind acrylate, the polyurethane acrylate resin high-speed stirring 20 minutes in sealable container; Butylacetate, ethyl acetate, Virahol are prepared priming paint part by weight 15%:20%:10% as required be made into mixed solvent, slowly drop into the mixed solvent of 40-42% at whipped state, middling speed stirred 10 minutes; Drop into HCPK and TPO mixed light initiator and organo-siloxane flow agent then, middling speed stirred 10 minutes; With remaining mixed solvent stirring at low speed priming paint is regulated viscosity to 9.5 ± 0.5S again;
In the preparation method of lacquer be: in sealable container, dropped into behind polyester modified polyurethane acrylate resin, polyurethane acrylate resin, the phosphoester acrylic ester high-speed stirring 20 minutes; Lacquer part by weight 15%:25%:20% was made into mixed solvent during butylacetate, ethyl acetate, Virahol prepared as required, slowly dropped into the mixed solvent of 55-58% at whipped state, and middling speed stirred 10 minutes; Drop into HCPK and TPO mixed light initiator then, middling speed stirred 10 minutes; With remaining mixed solvent stirring at low speed middle lacquer is regulated viscosity to 8.5 ± 0.5S again;
The preparation method of finish paint is: dropped into behind polyurethane acrylate resin, acrylate, the phosphoester acrylic ester high-speed stirring 20 minutes in sealable container; Butylacetate, ethyl acetate, Virahol are prepared the finish paint part by weight as required be made into mixed solvent at 15%: 20%: 15%, slowly drop into the mixed solvent of 45-48% at whipped state, middling speed stirred 10 minutes; Drop into HCPK and TPO mixed light initiator and organo-siloxane flow agent then, middling speed stirred 10 minutes; With remaining mixed solvent stirring at low speed finish paint is regulated viscosity to 9 ± 0.5S again.
Carrying out electric plating method with vacuum plating coating is: priming paint, middle lacquer, finish paint filter with 500 mesh filter screens, finish by the process sequence of priming paint → plated film → middle lacquer → finish paint, and processing parameter is:
Priming paint: thickness 12-20 μ m, 55 ± 5 ℃ * 4-10min of IR, UV energy 1000-1500mj/cm2;
Middle lacquer: thickness 3-9 μ m, 55 ± 5 ℃ * 4-10min of IR, UV energy 300-500mj/cm2;
Finish paint: thickness 12-20 μ m, 55 ± 5 ℃ * 4-10min of IR, UV energy 1200-1800mj/cm2;
In not additive color or when light color, are without middle lacquerer's preface.
Effect of the present invention is: 1, adopt import environmental protection raw material, low toxicity; 2, production process does not have the High Temperature High Pressure process, and is safe; 3, directly use.Need not dilute, convenient; 4, be ultraviolet light polymerization, the production efficiency height.
Embodiment
Below in conjunction with embodiment the present invention is done and to describe in further detail.
Priming paint is by weight ratio:
Scheme |
Polyurethane acrylate resin |
Acrylate |
The organo-siloxane flow agent |
HCPK and TPO mixed light initiator |
Mixture |
DA |
20 |
25 |
0.5 |
4 |
50.5 |
DB |
25 |
20 |
0.5 |
3 |
51.5 |
DC |
22.5 |
22.5 |
1.0 |
3.5 |
50.5 |
Middle lacquer is by weight ratio:
Scheme |
The polyester modified polyurethane acrylate resin |
Polyurethane acrylate resin |
Phosphoester acrylic ester |
HCPK and TPO mixed light initiator |
Mixture |
ZA |
30 |
5 |
1.0 |
0.5 |
63.5 |
ZB |
30 |
5 |
1.0 |
1.0 |
63 |
Finish paint is by weight ratio:
Scheme |
Polyurethane acrylate resin |
Acrylate |
The organo-siloxane flow agent |
Phosphoester acrylic ester |
HCPK and TPO mixed light initiator |
Mixture |
MA |
30 |
15 |
0.5 |
1.0 |
3 |
50.5 |
Vacuum plating indium film test interpretation of result
DA+ZA+MA: part has loss of gloss, and boiling water boils 2 hours sticking power test passes; Analyze; The acrylate ratio is too high, and is too strong to the base material swelling property, causes the priming paint loss of gloss.
DA+ZB+MA: part has loss of gloss, and boiling water boils 30 minutes clock sticking power test passes, boils 1 hour postadhesion power test finish paint and partly comes off; Analyze; Middle lacquer photoinitiator levels is higher, overreact, and it is bad to cause that finish paint adheres to.
DB+ZA+MA: boiling water boils 1 hour sticking power test passes, boils that priming paint comes off from base material top after 3 hours; Analyze; The acrylate ratio to base material swelling property deficiency, causes that priming paint and base material adherence are bad very little.
DB+ZB+MA: boiling water boils priming paint after 2 hours, and finish paint all has part to come off; Analyze; Middle lacquer photoinitiator levels is higher, overreact.
DC+ZA+MA: boiling water boils that coating comes off from priming paint top after 2 hours; Analyze; Flow agent content is higher, influences the absorption of coating.
DC+ZB+MA: boiling water boils coating after 2 hours, and finish paint all has part to come off; Analyze; Middle lacquer photoinitiator levels is higher, overreact.
Conclusion (of pressure testing):
Polyurethane acrylate resin in the priming paint and acrylate ratio will suit, and optimum proportion is 1:1; Organo-siloxane flow agent consumption in the priming paint can not be too high; Middle lacquer light trigger ratio can not be high.
Example 1: with the spraying of low-pressure spray gun air atomizing, base material is the PC phone housing, priming paint thickness 16 μ m, 55 ℃ * 6min of IR, UV energy 1100mj/cm2; Plated film, vacuum plating this moment 50%:50% indium stannum alloy film adds 35% dyestuff that contains admittedly 2%, thickness 5 μ m, 55 ℃ * 6min of IR, UV energy 380mj/cm2; Finish paint thickness 18 μ m, 60 ℃ * 6min of IR, UV energy 1360mj/cm2; Test performance sticking power is greater than 95%, and hardness is not less than H(1000g power), RCA(175g power) greater than 500 times, light discolouration sticking power is arranged greater than 95% behind the boiling water poach 60min, vibration abrasion 120min does not have and comes off.
Example 2: with the spraying of low-pressure spray gun air atomizing, base material is the PC mobile phone navigation key, priming paint thickness 18 μ m, 55 ℃ * 6min of IR, UV energy 1300mj/cm2; Plated film, Al metallizing Fool at this moment; Middle lacquer adds 18% nano color paste that contains admittedly 3%, thickness 7 μ m, 55 ℃ * 6min of IR, UV energy 420mj/cm2; Finish paint thickness 20 μ m, 60 ℃ * 6min of IR, UV energy 1600mj/cm2; Test performance sticking power is greater than 95%, and hardness is not less than H(1000g power), vibration abrasion 180min does not have and comes off.
Example 3: with the spraying of low-pressure spray gun air atomizing, base material is a PC+10% glass hand set machine shell, priming paint thickness 20 μ m, 60 ℃ * 6min of IR, UV energy 1000mj/cm2; Plated film, vacuum plating this moment indium film; Middle lacquer adds 18% nano color paste that contains admittedly 2%, thickness 6 μ m, 55 ℃ * 6min of IR, UV energy 300mj/cm2; Finish paint thickness 16 μ m, 60 ℃ * 6min of IR, UV energy 1200mj/cm2; Test performance sticking power is greater than 95%, and hardness is not less than H(1000g power), RCA(175g power) greater than 500 times, no variable color and foaming sticking power are greater than 95% behind the boiling water poach 60min, and vibration abrasion 120min does not have and comes off.
Example 4: with the spraying of low-pressure spray gun air atomizing, base material is the PC hand set machine shell, priming paint thickness 12 μ m, 50 ℃ * 6min of IR, UV energy 800mj/cm2; Plated film, vacuum tin-plated coating film at this moment; Coat with lacquer in the nothing; Finish paint thickness 14 μ m, 60 ℃ * 6min of IR, UV energy 1200mj/cm2; Test performance sticking power is greater than 95%, and hardness is not less than H(1000g power), RCA(175g power) greater than 350 times.