CN104043571B - The coated technique of silver anti-darkening blackening - Google Patents

The coated technique of silver anti-darkening blackening Download PDF

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CN104043571B
CN104043571B CN201410323733.9A CN201410323733A CN104043571B CN 104043571 B CN104043571 B CN 104043571B CN 201410323733 A CN201410323733 A CN 201410323733A CN 104043571 B CN104043571 B CN 104043571B
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silver
led
blackening
darkening
protective coating
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CN104043571A (en
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史海生
王造吉
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Gold Cultural Development Co Ltd Of Suzhou Wu
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Gold Cultural Development Co Ltd Of Suzhou Wu
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Abstract

The present invention relates to the coated technique of a kind of silver anti-darkening blackening, comprise the steps: S1: silver goods are provided, and clean silver product surface;S2: coating LED UV function nano protective coating on silver goods, wherein, the thickness of the dope layer of this LED UV function nano protective coating is 1.5 6um, and the nano components of described LED UV function nano protective coating is nano silicon;S3: carry out heating levelling by infrared ray on silver goods;S4: use LED UV area source to carry out cold light solidification on dope layer.

Description

The coated technique of silver anti-darkening blackening
Technical field
The present invention relates to the coated technique of a kind of silver anti-darkening blackening.
Background technology
Silver is the metal of a kind of white, has stronger metallic luster, has preferable ductility.Silver is first Decorations any surface finish, gives the sensation of elegance.But, when silver meets sulphur, the sulfuration of black will be formed Silver, makes silver jewellery surface staining;Sometimes, because containing some pernicious gas in air, it is possible to make Silver jewellery are overshadowed and blackening.
In addition, silver also can be with some iodide, bromide, chloride, hydrogen sulfide, sulfurous acid etc. Material reacts, thus causes the appearance of scales phenomenon.In life, silver jeweleries should be avoided as far as possible and have Excitant or corrosive gas contact (such as hydrogen sulfide, sulfur dioxide etc.) with material, because these gases Or material all can cause silver jeweleries blackening.
Owing to silver is a kind of active metal, the reason of silver jeweleries blackening is as follows:
1. autoxidation, infrequently wears, after taking regardless of, careless one puts, silver can and air in Sulfur dioxide combines and natural oxidation reaction occurs;
2. encounter the chemicals containing " sulphur " (such as cosmetics, perfume, an agent, soap etc.) and silver can be corroded Decorations surface so that silver jeweleries blackening, so, silver jeweleries should not be worn in the place that chemical gas is dense;
3. running into internal has deposition toxin, and health acidic materials are too many, or health is sick;
4. sweat (chloride in sweat) can corrode silver jeweleries surface so that silver jeweleries blackening,
Also having a key factor is to have the biggest affinity between silver and sulphur, and scientist measures silver at air In be readily generated a kind of extremely poorly soluble silver salt (Ag2S) (silver when running into hydrogen sulfide h2s gas or sulphion Salt is exactly the main component of argentite), this chemical change can occur in the case of denier, and silver exists As long as air meets hydrogen sulfide h2s gas or sulphion, the Jiu Huifa of several trillion to tens part per trillion Give birth to row chemical reaction: 4Ag+2H2S+O2=2Ag2S (grey black product)+2H2O, reaction result is silver-colored Surface creates silver sulfide (Ag2S), because silver sulfide is grey black, so along with the aggravation of reaction, Silver sulfide increases and thickens, and silver surface color is the most progressively by the last blackening of leucismus xanthochromia ash.
In silver goods industry, the darkening of silver is always problem demanding prompt solution.
Research and production department is studied the most in many ways, to stop the surface stain of silver jewellery, one of which Method is exactly at the stronger palladium of the plated surface last layer gloss of silver jewellery, rhodium, when plating this layer of noble metal After, it is possible not only to make silver jewellery prevent blackening, and it is attractive in appearance that it can be made more to become clear.
Lily gilding is also in plating palladium, rhodanizing.It is the most steady that palladium, rhodium fall within platinum family element, physics and chemical property Fixed, role is anti-oxidation.It is naturally occurring in mineral deposit, but extracts extremely difficult, and palladium, rhodium plate Layer time length also wears out and comes off.It addition, sixty-four dollar question is, reclaiming old silver goods Time, originally the platinum noble metal such as the palladium of electroplating surface, rhodium, is difficult to separate with silver, separation costs also than Higher, this can affect the purity of silver and strengthen the cost recovery of silver.
In order to stop the surface stain of silver jewellery, TFS 500 nSILVER of Beneq Corp. of Finland invention Anti-darkening nano coating technology is that the anti-darkening of silverware provides another solution.This nanometer is protected Coating is realized by the nano thin-film fully transparent, conformal in silverware surface deposition.nSILVER Coating is made up of double-layer ceramic nano-metal-oxide thin-film material: nano aluminium oxide (Al2O3) and titanium dioxide Titanium (TiO2).Bottom nano thin-film and metal have good attachment characteristic, top layer nano thin-film to liquid and Chemicals has good etch resistant properties.The double-layer nanometer membrane structure of nSILVER is complete after optimizing Transparent.And nano thin-film actually can also improve the reflectivity on surface, therefore through nSILVER Silverware after plated film seems more glossy than fine silver itself.
But, this technology is owing to using double-layer ceramic nano-metal-oxide thin-film material composition: nano oxygen Change aluminium (Al2O3) and titanium dioxide (TiO2), and this double-layer ceramic nano-metal-oxide thin-film material contains Metallic aluminium Al and Titanium Ti, both metals also are difficult to separate with silver, and separation costs is the highest, Also can affect the purity of silver and strengthen the cost recovery of silver.
Because above-mentioned defect, the design people, the most in addition research and innovation, to founding a kind of silver The coated technique of anti-darkening blackening so that it is have more the value in industry.
Summary of the invention
For solving above-mentioned technical problem, it is an object of the invention to provide the coating of a kind of silver anti-darkening blackening Technique, there is not the problem big with silver separating difficulty due to metal ingredient encountered in prior art in it, And improve the wearability of silver goods, coating be not easy abrasion and come off, and coating be high transparency, High glaze.
The coated technique of the silver anti-darkening blackening of the present invention, comprises the steps:
S1: silver goods are provided, and clean silver product surface;
S2: coat LED-UV function nano protective coating, wherein, this LED-UV merit on silver goods The thickness of the coating of energy nanometer protective coating is 1.5-6um, described LED-UV function nano protective coating Nano components is nano silicon;
S3: carry out heating levelling by infrared ray on silver goods;
S4: use LED-UV area source to carry out cold light solidification on dope layer.
Further, in described step S2, when described silver goods are three-dimensional shape, described LED-UV function nano protective coating uses the mode of spraying to be perfunctory on silver goods.
Further, the viscosity of described LED-UV function nano protective coating is the 2# rock field cup delivery time Between the 8-25 second.
Further, described step S2 also comprises the steps: before coating, need first by described LED-UV function nano protective coating is electrically heated insulation in Water Tank with Temp.-controlled, until LED-UV function It is between the 8-25 second that the viscosity of nanometer protective coating is reduced to the 2# rock field cup delivery time.
Further, described LED-UV function nano protective coating carries out the heating heated in Water Tank with Temp.-controlled Between temperature is 45-85 DEG C.
Further, in described step S2, when described silver goods are flat article, described LED-UV Function nano protective coating uses the mode of roller coat to be perfunctory on silver goods.
Further, in described step S3, the ultrared heat time is 1-5min.
Further, in described step S4, when described silver goods are three-dimensional shape, adopted LED-UV area source be 3 D stereo LED-UV area source.
Further, in described step S4, when described silver goods are flat article, used LED-UV area source is planar LED-UV area source.
Further, when described silver goods are three-dimensional shape, described coated technique is in step S4 After also comprise the steps: S5: use the mode of infrared heating that dope layer is carried out dual cure.
By such scheme, the present invention at least has the advantage that
(1) the LED-UV function employed in the coated technique due to the anti-darkening blackening of the silver of the present invention is received The nano components of rice protective coating is nano silicon, so it is without any metal ingredient, Bu Huiying Ring the purity of silver, the most there is not separating with silver due to metal ingredient encountered in above-mentioned prior art The problem that difficulty is big.
(2) it is nanometer two due to the nano components of LED-UV function nano protective coating of the present invention Silica, on the one hand improves the wearability of silver goods, and coating is not easy abrasion and comes off, simultaneously Dope layer has the performances such as the highest hardness, pliability, elasticity, adhesive force;On the other hand, dope layer Being fully transparent, glossiness is the highest, thus also contributes to improve the reflectivity on surface.
(3) owing to combining, employing carries out heating levelling by infrared ray, employing planar LED-UV area source enters Row cold light curing process, thus energy-conservation 50-90% for comparing prior art, and do not produce ozone and heat Amount.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the skill of the present invention Art means, and can being practiced according to the content of specification, below with presently preferred embodiments of the present invention and join After closing accompanying drawing detailed description such as.
Accompanying drawing explanation
Fig. 1 is the flow chart of the coated technique of silver of the present invention anti-darkening blackening.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, the detailed description of the invention of the present invention is described in further detail. Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.
Incorporated by reference to Fig. 1, the coated technique of a kind of silver anti-darkening blackening, including step S1 to S4.This step Rapid S1 to S4 is required to complete in dust-free workshop.
S1: silver goods are provided, and clean silver product surface.In this step, cleaning silver goods The technique on surface completes on dust-free workshop production line, with full-automatic mechanical hand-guided dust blower to silver Product surface carries out the cleanings such as air blowing dedusting and processes.Equipment employed in this step has: the quiet sky of oil-free Press, full-automatic dust blower, plastic cement conveyer belt conveyer, dust-free workshop.
S2: coat LED-UV function nano protective coating, wherein, this LED-UV merit on silver goods The thickness of the dope layer of energy nanometer protective coating is 1.5-6um.Described LED-UV function nano protective coating Nano components be Nanosized Inorganic Non-Metal Materials, such as nano silicon (Nano-SiO2) (nanometer chi Very little below 100 nanometers, average 50 ran), it does not contains any metal ingredient, does not interferes with white The purity of silver.
In this step, by the difference of silver goods, following two concrete steps can be divided to complete coating.
When described silver goods are three-dimensional shape, described LED-UV function nano protective coating uses The mode of spraying is perfunctory on silver goods.Owing to LED-UV function nano protective coating does not contains any molten Agent, is 100% solid content, and viscosity wants a little higher than usual vehicle type sprayed coating, so, before coating, Need first described LED-UV function nano protective coating to be electrically heated in Water Tank with Temp.-controlled insulation, until It is between the 8-25 second that the viscosity of LED-UV function nano protective coating is reduced to the 2# rock field cup delivery time, The heating-up temperature that LED-UV function nano protective coating carries out heating in Water Tank with Temp.-controlled be 45-85 DEG C it Between.When the viscosity of this LED-UV function nano protective coating be the 2# rock field cup delivery time be the 8-25 second it After between, then it is extracted in the closing spray cans that full-automatic mechanical hand is held carries out without gas blowout with pneumatic diaphragm pump circulation It is coated with construction.Equipment employed in this step has: full-automatic mechanical hand precision spray-painting production line, thermostatted water Groove, pneumatic diaphragm pump.
When described silver goods are flat article, described LED-UV function nano protective coating uses roller coat Mode be perfunctory on silver goods.It is different from above-mentioned spraying method, when using roll coating model, it is not necessary to Heating and thermal insulation, but room temperature is than in the case of relatively low in the winter time, need to enter LED-UV function nano protective coating Row heating and thermal insulation, is then extracted in the rubber coated pressure bowl of full-automatic roll coater with pneumatic diaphragm pump circulation and carries out roller It is coated with construction.Equipment employed in this step has: full-automatic accurate roller coating production line, pneumatic diaphragm pump.
S3: carry out heating levelling, wherein, ultrared heat time by infrared ray on silver goods For 1-5min.By this step, the LED-UV function nano that silver product surface is the most uncured can be made The coating of protective coating more levelling, improves brightness.Equipment employed in this step has: far infrared Line heating levelling curing.
S4: using LED-UV area source to carry out cold light solidification on dope layer, wherein cold light is hardening time: 1-5s.In this step, by the difference of silver goods, following two concrete steps can be divided to complete cold light Solidification.When described silver goods are three-dimensional shape, the LED-UV area source used is vertical for three-dimensional Body LED-UV area source, its equipment used has: 3 D stereo LED-UV area source cold light cure system. When described silver goods are flat article, the LED-UV area source used is planar LED-UV area source, Its equipment used has: planar LED-UV area source cold light cure system.
When described silver goods are three-dimensional shape, use cold through 3 D stereo LED-UV area source Photocuring system, after carrying out cold light solidification, always some position is owing to can not see LED-UV light or being subject to LED-UV light energy is not enough, thus, the dope layer causing LED-UV function nano protective coating can not It is fully cured, so, after step S4, also comprise the steps: S5 at described coated technique: use red The mode of outside line heating carries out dual cure to dope layer, and wherein heating thorough hardening time is 5-20min. Equipment employed in this step is: FAR INFRARED HEATING levelling curing.
At this it should be understood that for the plane silver goods of regular shape, due to by LED-UV light According to energy comparison sufficient, the solidification of fully and completely LED-UV area source cold light can be carried out, without Dual cure is carried out carrying out FAR INFRARED HEATING.
Below according to specific embodiment, the coated technique of the silver anti-darkening blackening of the present invention is carried out specifically Bright.
Embodiment 1: the coated technique of the anti-darkening blackening of plane silver brick
S1: provide plane silver brick, on dust-free workshop production line, with full-automatic mechanical hand-guided drifting dust The plane silver brick surface of rifle pair carries out the cleanings such as air blowing dedusting and processes.
S2: coat LED-UV function nano protective coating, wherein, this LED-UV function on plane silver brick The thickness of the dope layer of nanometer protective coating is 5um.In this step, when indoor temperature is relatively low (such as the winter My god), LED-UV function nano protective coating need to be carried out heating and thermal insulation, carry out roller application the most again.Institute The nano components stating LED-UV function nano protective coating is Nanosized Inorganic Non-Metal Materials--nanometer titanium dioxide Silicon (Nano-SiO2) (nano-scale is below 100 nanometers, average 50 ran), owing to it does not contains Any metal ingredient, so not interfering with the purity of silver.
S3: carry out heating levelling, wherein, ultrared heat time by infrared ray on plane silver brick For 1min.By this step, LED-UV function nano protection the most uncured on plane silver brick can be made to be coated with The dope layer more levelling of material, improves brightness.
S4: use planar LED-UV area source to carry out cold light solidification on dope layer, wherein during cold light solidification Between be: 1s.
It should be noted that above-mentioned steps has all operated in dust-free workshop.
Embodiment 2: the coated technique of the anti-darkening blackening of 3 D stereo silver jewellery
S1: 3 D stereo silver jewellery is provided, on dust-free workshop production line, uses full-automatic mechanical hand control Dust blower 3 D stereo silver jewellery surface carried out the cleaning such as air blowing dedusting process.
S2: spray LED-UV merit by full-automatic mechanical hand precision without gas dry type on 3 D stereo silver jewellery Energy nanometer protective coating, wherein, the thickness of the dope layer of this LED-UV function nano protective coating is 3um, The nano components of described LED-UV function nano protective coating is Nanosized Inorganic Non-Metal Materials--nanometer two Silica (Nano-SiO2) (nano-scale is below 100 nanometers, average 50 ran), due to It does not contains any metal ingredient, so not interfering with the purity of silver.In this step, due to LED-UV Function nano protective coating does not contains any solvent, is 100% solid content, and viscosity wants a little higher than usual vehicle Type sprayed coating, so, before coating, need first by described LED-UV function nano protective coating in perseverance Warm water tank is electrically heated insulation, until the viscosity of LED-UV function nano protective coating is reduced to 2# The rock field cup delivery time is between the 8-15 second, and LED-UV function nano protective coating enters in Water Tank with Temp.-controlled The heating-up temperature of row heating is between 85 DEG C.When the viscosity of this LED-UV function nano protective coating is 2# The rock field cup delivery time be between the 8-15 second after, then carry out spraying application.
S3: carry out heating levelling by infrared ray on 3 D stereo silver jewellery, wherein, ultrared add The heat time is 3min.By this step, LED-UV function nano the most uncured on plane silver brick can be made The coating of protective coating more levelling, improves brightness.
S4: using 3 D stereo LED-UV area source to carry out cold light solidification on dope layer, wherein cold light is solid The change time is: 3s.
S5: use the mode of infrared heating that coating is carried out dual cure, wherein heat when thoroughly solidifying Between be 15min.
It should be noted that above-mentioned steps has all operated in dust-free workshop.
In sum: the coated technique advantage specific as follows of the silver anti-darkening blackening of the present invention:
(1) the LED-UV function employed in the coated technique due to the anti-darkening blackening of the silver of the present invention is received Rice protective coating is 100% solid content, does not contains any solvent, so, will not be right when this process implementing Environmental pollution, simultaneously as the nano components of LED-UV function nano protective coating is nano inorganic Nonmetallic materials, it not containing any metal ingredient, so not interfering with the purity of silver, not existing State the problem big with silver separating difficulty due to metal ingredient encountered in prior art.
(2) due to nano silicon (Nano-SiO of the present invention2), on the one hand make to improve The wearability of silver goods, and dope layer is not easy abrasion and comes off, dope layer has the highest hard simultaneously The performances such as degree, pliability, elasticity, adhesive force;On the other hand, dope layer is fully transparent, gloss Spend the highest, thus also contribute to improve the reflectivity on surface.
(3) carry out heating levelling, planar LED-UV area source and carry out cold light solidification work owing to combining infrared ray Skill, thus energy-conservation 50-90% for comparing prior art, and do not produce ozone and heat.
The above is only the preferred embodiment of the present invention, is not limited to the present invention, it is noted that For those skilled in the art, on the premise of without departing from the technology of the present invention principle, Can also make some improvement and modification, these improve and modification also should be regarded as protection scope of the present invention.

Claims (10)

1. the coated technique of a silver anti-darkening blackening, it is characterised in that: described coating processes comprises the steps:
S1: silver goods are provided, and clean silver product surface;
S2: coating LED-UV function nano protective coating on silver goods, wherein, the thickness of the dope layer of this LED-UV function nano protective coating is 1.5-6 μm, and the nano components of described LED-UV function nano protective coating is nano silicon;
S3: carry out heating levelling by infrared ray on silver goods;
S4: use LED-UV area source to carry out cold light solidification on dope layer.
The coated technique of silver the most according to claim 1 anti-darkening blackening; it is characterized in that: in described step S2; when described silver goods are three-dimensional shape, described LED-UV function nano protective coating uses the mode of spraying to be perfunctory on silver goods.
The coated technique of silver the most according to claim 2 anti-darkening blackening, it is characterised in that: the viscosity of described LED-UV function nano protective coating be the 2# rock field cup delivery time be between the 8-25 second.
The coated technique of silver the most according to claim 3 anti-darkening blackening; it is characterized in that: described step S2 also comprises the steps: before coating; need first described LED-UV function nano protective coating to be electrically heated in Water Tank with Temp.-controlled insulation, until it is between the 8-25 second that the viscosity of LED-UV function nano protective coating is reduced to the 2# rock field cup delivery time.
The coated technique of silver the most according to claim 4 anti-darkening blackening, it is characterised in that: between the heating-up temperature that described LED-UV function nano protective coating carries out heating in Water Tank with Temp.-controlled is 45-85 DEG C.
The coated technique of silver the most according to claim 1 anti-darkening blackening, it is characterised in that: in described step S2, when described silver goods are flat article, described LED-UV function nano protective coating uses the mode of roller coat to be perfunctory on silver goods.
The coated technique of silver the most according to claim 1 anti-darkening blackening, it is characterised in that: in described step S3, the ultrared heat time is 1-5min.
The coated technique of silver the most according to claim 1 anti-darkening blackening, it is characterised in that: in described step S4, when described silver goods are three-dimensional shape, the LED-UV area source used is 3 D stereo LED-UV area source.
The coated technique of silver the most according to claim 1 anti-darkening blackening, it is characterised in that: in described step S4, when described silver goods are flat article, the LED-UV area source used is planar LED-UV area source.
The coated technique of silver the most according to claim 1 anti-darkening blackening, it is characterized in that: when described silver goods are three-dimensional shape, described coated technique also comprises the steps: S5 after step S4: use the mode of infrared heating that coating is carried out dual cure.
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