CN103897576A - Paint, preparation method thereof, electronic product shell and preparation method thereof - Google Patents
Paint, preparation method thereof, electronic product shell and preparation method thereof Download PDFInfo
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- CN103897576A CN103897576A CN201210566596.2A CN201210566596A CN103897576A CN 103897576 A CN103897576 A CN 103897576A CN 201210566596 A CN201210566596 A CN 201210566596A CN 103897576 A CN103897576 A CN 103897576A
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Abstract
The invention provides a paint. Based on the total weight of the paint, the paint comprises the following components by weight percentage: 10-40 wt% of phenolic epoxy acrylate, 20-50 wt% of aliphatic polyurethane acrylate with functionality no less than 6, 20-50 wt% of a reactive diluent monomer, 1-5 wt% of a photoinitiator, 4-8 wt% of an extinction powder, 0.1-5 wt% of an assistant, and the balance of an organic solvent. The invention also provides a preparation method of the above paint, an electronic product shell and a preparation method thereof. An application technology provided by the invention includes painting or spraying the paint in a transparent shell and then conducting injection moulding of a buckle, so as to realize a strong sense of depth and thin the shell thickness. The paint prepared by the invention has good anti-shock effect, has high crosslinking density and hardness to protect the lower paint from being destroyed by high temperature injection molding material above 250 DEG C in injection molding, and has high surface energy to apply strong adhesion to the upper adhesive. The paint and technology provided by the invention are both suitable for mass production.
Description
Technical field
The present invention relates to a kind of paint and preparation method thereof, also related to a kind of electronic product casing and preparation method thereof.
Background technology
Existing dijection injection molding technology is due to single injection thickness limits, twice injection moulding stack sum cannot reach below 5mm, cause the thickness of the casing that has depth perception all very large, for attenuate casing thickness, conventional method is single injection transparent outer cover on the market, after spray paint overleaf, but the limitation of this kind of method is to spray at plane position, and in the position that has structure, as carried out back side spraying in buckle part, buckle cannot hide, and coating is very easily worn, the aesthetic that impact is seen from product front.
CN201120374158 discloses a kind of double-colored colored keycap, the cap body that comprises injection moulding be positioned at the external sidewall of described cap on and the sprayed coating different from described cap body color, described cap body adopts after monochromatic injection moulding, cover described cap body top, spray and can complete in the external side-walls of described cap again, but the method cannot realize the effect of the depth of field.
CN200810218153 discloses a kind of preparation method of multi-color high-light transparent injection moulding piece, utilize common injection-moulding device, adopt the injection mold of common high-light transparent, inject transparent moulding, then positioning fixture is arranged on moulding, according to product requirement, oil spout coloring process is once implemented in the surface of moulding in batches again, make the aspect such as appearance tactile impression, visual effect of moulding, can compare favourably with double-colored, the high light moulding that direct injection moulding is produced completely, but the method cannot be carried out the injection moulding of buckle on color coating again.
Summary of the invention
In order to solve existing paint and binder layer and color layers adhesion effect is poor, color is easily rushed to open because of High Temperature High Pressure, be difficult to possess the problem of good appearance and performance, simultaneously in order to solve existing can only spraying at plane position, and having the position of structure as carried out back side spraying in buckle part, buckle cannot hide, thereby the problem of the aesthetic that impact is seen from product front, the invention provides a kind of paint, taking the gross weight of this paint as benchmark, the weight percentage of each component is: Epoxy Phenolic Acrylates 10wt%-40wt%, the aliphatic urethane acrylate 20wt%-50wt% of functionality >=6, activity diluting monomer 20wt%-50wt%, light trigger 1wt%-5wt%, flatting silica 4wt%-8wt%, auxiliary agent 0.1wt%-5wt%, all the other are organic solvent.
The present invention also provides the preparation method of paint disclosed in this invention, comprises step: the aliphatic urethane acrylate of Epoxy Phenolic Acrylates, functionality >=6, activity diluting monomer, light trigger, flatting silica, auxiliary agent, organic solvent are mixed.
In addition, the present invention also provides a kind of preparation method of electronic product casing, comprises step: 1) spraying or printing pattern background colour without buckle transparent outer cover back in injection formed; 2) cover other positions, only spray paint provided by the present invention in the position that needs injection moulding buckle; 3) cover other positions, only needing the position spraying sizing agent of injection moulding buckle; 4) carry out buckle injection moulding, get final product to obtain described electronic product casing.
The preparation method of electronic product casing provided by the invention is in the inner air brushing of casing or spraying, after paint on carry out again injection moulding buckle, because being only injection-moulded in electronic product casing week, buckle makes a circle, area is very little, therefore do not increase the thickness of electronic product casing plane, both can realize strong depth perception, again attenuate the thickness of electronic product casing housing.The paint protecting against shock that the present invention prepares is effective, utilizes its very high cross-linking density and hardness, and the more than 250 DEG C high-temperature injection material can protect its lower floor's paint not to be injection molding time destroys, and surface can be high, can have very strong sticking power to the sizing agent on its upper strata.Paint provided by the invention and applied technique thereof are all applicable to batch production, and the present invention, after spraying, needs the part of buckle to carry out quadric injection mould on color coating, ensures the intensity of depth perception effect and buckle in attenuate injection moulding thickness.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The invention provides a kind of paint, taking the gross weight of this paint as benchmark, each component concentration is: aliphatic urethane acrylate 20 wt%-50wt%, the activity diluting monomer 20wt%-50wt% of Epoxy Phenolic Acrylates 10 wt%-40wt%, functionality >=6, light trigger 1wt%-5wt%, flatting silica 4wt%-8wt%, auxiliary agent 0.1wt%-5wt%, all the other are organic solvent.
According to the present invention, further preferably, taking the gross weight of this paint as benchmark, each component concentration is: aliphatic urethane acrylate 20wt%-30wt%, the activity diluting monomer 20wt%-30wt% of Epoxy Phenolic Acrylates 15wt%-30wt%, functionality >=6, light trigger 2wt%-3wt%, flatting silica 5wt%-8wt%, auxiliary agent 0.5wt%-1wt%, all the other are organic solvent.
According to the present invention, described epoxy acrylic resin, because being used in instantaneous temperature, product of the present invention reaches in 250 DEG C of above situations, therefore choose the epoxy acrylate of Epoxy Phenolic Acrylates and/or high functionality, all can be directly by commercially available, CN2204, SB510E35 that for example Sartomer (Sartomer) company produces, 625C-45 or Dongyang resin DY3600, DY3800 that Changxing company produces, more preferably Changxing 625C-45, Dongyang resin DY3600, consumption is the 10-40wt% of paint gross weight, more preferably 15-30wt%.
According to the present invention, the aliphatic polyurethane acrylic resin of described functionality >=6 can be directly commercially available, U400, the B175X that for example can select Beyer Co., Ltd (Bayer) to produce, CN8001, CN9010, CN9013, CN996NS, CN983 that Sartomer company produces, Changxing company produce 6147,6149-100, CN996NS and Changxing 6147 that more preferably Sartomer company produces, consumption is the 20wt%-50wt% of paint gross weight, more preferably 20wt%-30wt%.
According to the present invention, preferably, described activity diluting monomer is simple function group or polyfunctional group acrylic monomer, can be directly by commercially available, described activity diluting monomer can produce crosslinking reaction with the aliphatic polyurethane acrylic resin of above-mentioned Epoxy Phenolic Acrylates and functionality >=6 and form fine and close reticulated structure, the surging force of High Temperature High Pressure while resisting follow-up injection moulding.Activity diluting monomer of the present invention is preferably functionality and is more than or equal to 3 activity diluting monomer, can be directly by commercially available, SR454, SR494, CD9051 that for example Sartomer company produces, the EM70 that Changxing company produces, the EM70 that the SR494 that more preferably Sartomer company produces and Changxing company produce, the contraction when viscosity that can paint for adjusting and the reaction of minimizing paint film, consumption is the 20wt%-50wt% of paint gross weight, more preferably 20wt%-30wt%.
According to the present invention; preferably, described light trigger is selected from 1-hydroxyl-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-acetone, 2,4; 6(trimethylbenzoyl) one or more in diphenyl phosphine oxide, more preferably 1-hydroxyl-cyclohexyl-phenyl ketone.Light trigger of the present invention is conventionally known to one of skill in the art, can be commercially available, Cibar Irgacure184, Cibar Irgacure2202, Cibar TPO that for example Cibar company produces, more preferably Cibar Irgacure184, Cibar Irgacure2202.Described light trigger consumption is the 1wt%-5wt% of paint gross weight, more preferably 2 wt%-3wt%.
According to the present invention, preferably, described flatting silica is that fineness is the silicon-dioxide of 2-6 μ m, in order to increase surface-area, improves the surface energy of paint film, is conducive to adhering to of upper strata tackiness agent.Flatting silica of the present invention can be directly commercially available, one or more of the BT-302 of the TS100 that for example Degussa flatting silica OK520, Degussa flatting silica OK500, Degussa flatting silica OK607, goldschmidt chemical corporation are produced, the T-3000 that goldschmidt chemical corporation is produced, precious special Chemical Manufacture, more preferably Degussa flatting silica OK520, consumption is 4 wt%-8wt% of paint gross weight, more preferably 5 wt%-8wt%.
According to the present invention, preferably, auxiliary agent is flow agent, described flow agent is polysiloxane-polyether copolymer, described flow agent is conventionally known to one of skill in the art, can be commercially available one or more in TGEO Flow 300, TGEO Glide 410, TGEO Glide 435, the TGEO Glide 435 producing as XX company, the BYK-333 of Bi Ke chemical production, more preferably one or both in TGEO Flow 300, TGEO Glide 410.Described flow agent consumption is 0.1 wt%-5wt% of paint gross weight, more preferably 0.5 wt%-1wt%.
According to the present invention, preferably, described organic solvent is selected from one or more in toluene, dimethylbenzene, ethyl acetate, butylacetate, methyl iso-butyl ketone (MIBK), ethyl cellosolve acetate, pimelinketone, the ratio of the more preferably mixture of butyl glycol ether, ethyl acetate, butylacetate, methyl iso-butyl ketone (MIBK), and butyl glycol ether, ethyl acetate, butylacetate, methyl iso-butyl ketone (MIBK) is 2-8:4-10:5-12:2-8.Described consumption of organic solvent is 20 wt%-50wt% of paint gross weight, more preferably 25 wt%-35wt%.Paint of the present invention, its coating process is spraying, notes adjusting viscosity size and remain on No. two, 8 ~ 12s(rock field cup, 25 DEG C when preparation) between, the excessive paint film appearance tangerine line that easily causes of viscosity, levelling is bad; Viscosity is too small while causing spraying thickness is lower, paint film sagging phenomenon.
The present invention also provides the preparation method of above-mentioned paint, comprises step: the aliphatic urethane acrylate of Epoxy Phenolic Acrylates, functionality >=6, activity diluting monomer, light trigger, flatting silica, auxiliary agent, organic solvent are mixed.Can be described as particularly: comprise step: (preparation process crude oil and organic solvent separately, adjusting viscosity again when spraying, prevents along with the unstable situation of viscosity appears in the prolongation thinner volatilization of time):
(1) take relevant organic solvent by the required quality of solvent formula, stirring at low speed under high speed dispersor (600-800r/min), the time is 5-10min; Stop stirring, leave standstill froth breaking, sampling organic solvent;
(2) take resin and a small amount of above-mentioned organic solvent by the required quality of formula, stirring at low speed under high speed dispersor (600-800r/min), the time is 20-40min; Stop stirring, leave standstill froth breaking, sampling crude oil;
(3) configuration is applicable to the paint of spraying: in crude oil, add remaining above-mentioned organic solvent to be deployed into viscosity optimum between 8-12s, filter out impurity, dirty with 300 order filter cloths, and to be sprayed.
The present invention also provides a kind of preparation method of electronic product casing, comprises step: 1) spraying or printing pattern background colour without buckle transparent outer cover back in injection formed; 2) cover other positions, only spray paint of the present invention in the position that needs injection moulding buckle; 3) cover other positions, only needing the position spraying sizing agent of injection moulding buckle; 4) carry out buckle injection moulding, can obtain described electronic product casing.This preparation method is in the inner air brushing of transparent casing or spraying, after on paint, carry out again injection moulding buckle, both can realize strong depth perception, again attenuate casing thickness.The paint protecting against shock that the present invention prepares is effective, utilizes its very high cross-linking density and hardness, and the more than 250 DEG C high-temperature injection material can protect its lower floor's paint not to be injection molding time destroys, and surface can be high, can have very strong sticking power to the sizing agent on its upper strata.Paint of the present invention and applied technique thereof are all applicable to batch production.Sizing agent of the present invention is a kind of finished product sizing agent, works the ligation between the buckle painting and be injection molding, and sprays the optional sizing agent that well known to a person skilled in the art after spraying paint of the present invention again.
To paint of the present invention and preparation method thereof be described by embodiment below:
Embodiment 1-5
Use raw material as shown in table 1, be prepared as follows coating:
(1) take relevant organic solvent by the required quality of solvent formula, stirring at low speed under high speed dispersor (600-800r/min), the time is 5-10min; Stop stirring, leave standstill froth breaking, sampling organic solvent;
(2) take resin and a small amount of above-mentioned organic solvent by the required quality of formula, stirring at low speed under high speed dispersor (600-800r/min), the time is 20-40min; Stop stirring, leave standstill froth breaking, sampling crude oil;
(3) configuration is applicable to the paint of spraying: in crude oil, add remaining above-mentioned organic solvent to be deployed into viscosity optimum between 8-12s, filter out impurity, dirty with 300 order filter cloths, and to be sprayed.
Table 1
Viscosity test: (No. 2, rock field cup, 25 DEG C), embodiment 1 viscosity 9s, embodiment 2 viscosity 9.5s, embodiment 3 viscosity 9s, embodiment 4 viscosity 9.5s, embodiment 5 viscosity 9s.
Carry out injection moulding according to following application art step
(1) injection moulding is without the transparent outer cover of buckle
(2) carry out printing pattern or spraying background colour in transparent outer cover inside
(3) cover spraying protecting against shock paint
(4) cover other positions, only needing the position spraying sizing agent of injection moulding buckle
(5) injection moulding buckle, obtains respectively product S1-S5.
Concrete spraying method is as follows: coating process:
Manual spray gun sprays: the compressed air pressure of spraying is controlled at 0.4-0.8MPa, and paint flow quantity is controlled at 0.8-1.3ml/s, and atomization spraying swath should be controlled between 15 °-30 °, and (spraying air pressure is too low, paints liquid atomization insufficient, and paint film is inhomogeneous; When spraying air pressure is too high, paint liquid atomization is good, but the loss of coating cloud excessive velocities paint vehicle strengthens) coating is filled in spray gun with 300 order filter cloths, spray gun is apart from the distance 0.10-0.30m that is sprayed object plane, film thickness is 20 ± 5 microns, after spraying is good, at room temperature place 2 min, coating better levelling spreads on base material, then, under 80 DEG C of conditions, toast 10 min, cross UV lamp and solidify, curing energy is 1000-1300mJ/cm2.
To paint of prior art and preparation method thereof be described by comparative example below:
Comparative example 1
Adopt the paint of the embodiment 1 of CN200810027253.2 to replace the paint in the embodiment of the present invention 1, other are identical with embodiment 1, obtain product DS1.
Comparative example 2
Adopt the coating of the embodiment 1 of CN200810027650.X to replace the paint in the embodiment of the present invention 1, other are identical with embodiment 1, obtain product DS2.
Comparative example 3
Adopt the working method of the disclosed panel TV set panel of CN200810218153 to replace the application art in the embodiment of the present invention 1, other are identical with embodiment 1, obtain product DS3.
Performance test
one, sticking power testtesting standard: ISO 2409
Testing method: use the knife back of surgical knife at coating Shang Hua 12 road cuts, wherein at an angle of 90, to form from the teeth outwards grid, the length of side of grid is 1 millimeter at least two cuts and other cut.Guarantee that every cut is all cut to body material.Both direction along cut is respectively brushed 5 times with brush.Sticky 3M adhesive tape from the teeth outwards, with finger tip, wiping belt is tight, guarantee and the good contact of coating, tearing well-regulated adhesive tape opening off adhesive tape with the angle of 60 ° within 0.5-1 second in 5 minutes from the free end of adhesive tape.
two, grade classification:
5B: the edge of otch is completely level and smooth, the square of grid does not all peel off;
4B: the area that peels off part is not more than and 5% of the adhesive tape area of Surface Contact;
3B: the area that peels off part is greater than and 5% of the adhesive tape area of Surface Contact, and is no more than 15%;
2B: the area that peels off part is greater than and 15% of the adhesive tape area of Surface Contact, and is no more than 35%;
1B: the area that peels off part is greater than and 35% of the adhesive tape area of Surface Contact, and is no more than 65%.
This test request adhesion performance >=4B.
three, protecting against shock effect
The sample of observing after injection moulding has
without occurring red ink, crackingetc. problem of appearance.
The performance test results is as shown in table 2
Table 2
| ? | Sticking power | Grade classification | Protecting against shock effect |
| Embodiment 1 | OK | 5B | OK |
| Embodiment 2 | OK | 5B | OK |
| Embodiment 3 | OK | 5B | OK |
| Embodiment 4 | OK | 5B | OK |
| Embodiment 5 | OK | 5B | OK |
| Comparative example 1 | NG | 3B | Serious red ink |
| Comparative example 2 | OK | 4B | Serious red ink |
| Comparative example 3 | OK | 4B | Serious red ink |
As shown in Table 2, the paint being prepared by the present invention, in conjunction with the preparation method of electronic product casing provided by the present invention, not only there is good adhering to color layers and binder layer, and protecting against shock effect is good, the color layers at glue-feeder place is not rushed to open because of High Temperature High Pressure, has kept original good appearance and performance.Therefore, can realize in the inner air brushing of electronic product casing casing or spraying, after on paint, carry out again injection moulding buckle, at attenuate the Deep Canvas identical with dijection injection moulding of having got back in casing thickness.
In sum, these are only preferred embodiment of the present invention, be spirit and main points in order to help to understand this patent, but be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. a paint, taking the gross weight of this paint as benchmark, the weight percentage of each component is: aliphatic urethane acrylate 20wt%-50wt%, the activity diluting monomer 20wt%-50wt% of Epoxy Phenolic Acrylates 10wt%-40wt%, functionality >=6, light trigger 1wt%-5wt%, flatting silica 4wt%-8wt%, auxiliary agent 0.1wt%-5wt%, all the other are organic solvent.
2. paint according to claim 1, it is characterized in that, taking the gross weight of this paint as benchmark, each component concentration is: aliphatic urethane acrylate 20wt%-30wt%, the activity diluting monomer 20wt%-30wt% of Epoxy Phenolic Acrylates 15wt%-30wt%, functionality >=6, light trigger 2wt%-3wt%, flatting silica 5wt%-8wt%, auxiliary agent 0.5wt%-1wt%, all the other are organic solvent.
3. paint according to claim 1, is characterized in that, described activity diluting monomer is simple function group or polyfunctional group acrylic monomer.
4. paint according to claim 1, is characterized in that, described light trigger is selected from 1-hydroxyl-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-acetone, 2,4,6(trimethylbenzoyl) one or more in diphenyl phosphine oxide.
5. paint according to claim 1, is characterized in that, described flatting silica is the silicon-dioxide of fineness 2-6 micron.
6. paint according to claim 1, is characterized in that, described auxiliary agent is flow agent, and described flow agent is polysiloxane-polyether copolymer.
7. paint according to claim 1, is characterized in that, described organic solvent is selected from one or more in toluene, dimethylbenzene, ethyl acetate, butylacetate, methyl iso-butyl ketone (MIBK), ethyl cellosolve acetate, pimelinketone.
8. the paint of stating according to claim 7, it is characterized in that, described organic solvent is the mixture of butyl glycol ether, ethyl acetate, butylacetate, methyl iso-butyl ketone (MIBK), and the ratio of butyl glycol ether, ethyl acetate, butylacetate, methyl iso-butyl ketone (MIBK) is 2-8:4-10:5-12:2-8.
9. a preparation method for the paint as described in claim 1-8 any one, comprises step: the aliphatic urethane acrylate of Epoxy Phenolic Acrylates, functionality >=6, activity diluting monomer, light trigger, flatting silica, auxiliary agent, organic solvent are mixed.
10. a preparation method for electronic product casing, comprises step: 1) spraying or printing pattern background colour without buckle transparent outer cover back in injection formed; 2) cover other positions, only at the paint needing described in the position spraying claim 1-8 any one of injection moulding buckle; 3) spraying sizing agent; 4) carry out buckle injection moulding, can obtain described electronic product casing.
11. 1 kinds of electronic product casings, is characterized in that, are prepared by preparation method claimed in claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210566596.2A CN103897576A (en) | 2012-12-25 | 2012-12-25 | Paint, preparation method thereof, electronic product shell and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210566596.2A CN103897576A (en) | 2012-12-25 | 2012-12-25 | Paint, preparation method thereof, electronic product shell and preparation method thereof |
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| CN103897576A true CN103897576A (en) | 2014-07-02 |
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