Summary of the invention
By the Novel leveling agent exploring non-dye class, environmental friendliness and the molecule of stable chemical nature are electroplated as sour copper, the invention provides the non-dyestuff system leveling agent in a kind of sour copper plating, object is the defect evading or overcome conventional dyes system leveling agent, thus promotes the development of non-dyestuff system acid process for copper.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
An application for non-dyestuff system leveling agent, the molecular structural formula of described leveling agent is
Wherein, negatively charged ion X=Cl
-or Br
-; R
1=O or S or N; R
2, R
3, R
4=H, alkyl, thiazolinyl, aralkyl, heteroaralkyl, substituted alkyl, substituted alkenyl, substituted aralkyl or the one replaced in heteroaralkyl, described leveling agent is applied to sour copper electroplating technology.
Preferably, described leveling agent is L113, and its molecular structural formula is
The invention has the beneficial effects as follows:
The present invention, on the basis fully understanding acid copper-plating leveling agent molecular characterization and the mechanism of action, seeks and devises to have specific functional groups, the molecule of traditional leveling agent different from the past on molecular structure and attribute.This kind of leveling agent molecule has good water solubility, colourless nontoxic, harmless, the advantages such as operating restraint is wider.Evade and overcome the defect of conventional dyes system leveling agent, facilitating the development of non-dyestuff system acid process for copper.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technique means of the present invention, and can be implemented according to the content of specification sheets, coordinates accompanying drawing to describe in detail below with preferred embodiment of the present invention.The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Shown in Figure 1, a kind of non-dyestuff system leveling agent, be applied to sour copper electroplating technology, its molecular structural formula is
Wherein, negatively charged ion X=Cl
-or Br
-; R
1=O or S or N; R
2, R
3, R
4=H, alkyl, thiazolinyl, aralkyl, heteroaralkyl, substituted alkyl, substituted alkenyl, substituted aralkyl or the one replaced in heteroaralkyl.
Preferably, described leveling agent is L113, its molecular structure be for
The present invention passes through great many of experiments, explore the feasibility as novel sour copper leveling agent of the molecule with above-mentioned feature, have studied its in sour copper plating system with other components (as inhibitor, brightening agent etc.) etc. composite chemical ratios on the impact of quality of coating, and itself and traditional leveling agent are composite in the impact on sour copper electroplating quality.Its specific experiment flow process is as follows:
(1) preparation of electroplating chemical solution system
1, the electroplating chemical solution needed for the plating of sour copper and mother liquor system is prepared
The component of mother liquor comprises the CuSO that concentration is 200g/L
45H
2o, concentration are the H of 100g/L
2sO
4and concentration is the chlorion of 0-120ppm;
By the above-mentioned CuSO of calculated amount
45H
2o deionized water and stirring is fully dissolved, and slowly adds the above-mentioned H of calculated amount
2sO
4and HCl, be diluted to 1L after filtration, get in 250mL to Hull groove for subsequent use;
2, the additive needed for the plating of sour copper is prepared
The component of additive comprises inhibitor polyoxyethylene glycol (PEG), the outstanding glossy dark green B (L26) of conventional dyes type leveling agent and/or non-dyestuff system leveling agent L113 and brightening agent sodium polydithio-dipropyl sulfonate (SPS);
The pressed powder of PEG, L113 and/or L26 and SPS is diluted in 50mL volumetric flask with deionized water dissolving respectively, the aqueous solution of PEG, L113 and/or L26 and SPS of taking calculated amount adds in the Hull groove at mother liquor place successively, and makes full use of more than pneumatic blending 10min;
(2) plating conditions and method (groove test in Hull is electroplated with continuous current)
1, galvanic anode: the plough groove type phosphorus-copper anode carrying out pre-film (Anodefilming) in advance, is placed in both sides before and after negative plate respectively;
2, electroplating cathode: negative electrode sheet brass;
3, negative plate pre-treatment: negative electrode sheet brass washed with de-ionized water, then for plating;
(3) choose the leveling agent that L113 electroplates as sour copper and carry out testing research
1, chlorine ion concentration is on the impact experiment of leveling agent L113 molecule leveling performance
Can see from upper table, when chlorine ion concentration is about 80ppm, Hull slotted vane entirety is comparatively bright, and the flaw such as burr, pin hole is less.At this quasi-molecule as under the condition of leveling agent, adjustable chlorine ion concentration scope is 70-90ppm.In follow-up study, employing chlorine ion concentration is 80ppm.
2, L113 add-on regulates experiment
Hull groove test plating conditions:
(1)2A,5min
(2) Cl
-concentration: 80ppm
(3)T=24.0℃,BathT=24.0℃,H(humidity)=50.0%
Shown in Figure 3
L113 test-results: when keeping other conditions constant, latten(-tin) after suitable adjustment add-on plating improves a lot than the blank copper sheet luminance brightness not adding leveling agent, compared with traditional leveling agent, also have and improve by improving processing condition and optimizing the methods such as molecular structure further the space that it fills and leads up performance.
(4) the binary leveling agent performance study based on L113
Known by above-mentioned experiment, the feasibility using the molecule based on L113 molecular structure as Novel leveling agent.Carry out next step experiment simultaneously, study by L113 and traditional leveling agent molecule L 26 composite time impact on quality of coating.
1, fixed L 113 concentration, adds the outstanding glossy dark green B (L26) of conventional additive
Hull groove test plating conditions:
(1)2A,5min
(2)T=24.0℃,BathT=24.0℃,H(humidity)=50.0%
Shown in Figure 4
2, unchangable traditions additive L26 concentration, adds new additive agent L113
Hull groove test plating conditions:
(1)2A,5min
(2)T=24.0℃,BathT=24.0℃,H(humidity)=50.0%
A. additive: L260.5mL, L1130mL, Cl
-80ppm
Phenomenon: shown in Fig. 5 a, entirety is brightless.
B. additive: L260.5mL, L1130.25mL, Cl
-80ppm
Phenomenon: shown in Fig. 5 b, overall more little than changing with a, low district 1cm slightly brightens.
C. additive: L260.5mL, L1130.5mL, Cl
-80ppm
Phenomenon: shown in Fig. 5 c, entirety starts to brighten, but crystallization is thin not, and brightness is inadequate.
D. additive: L260.5mL, L1131mL, Cl
-80ppm
Phenomenon: shown in Fig. 5 d, luminance factor c brightens, but there is no the best fashion of L26 but the very thin Surface flat of crystallization is fine, low district 2cm is atomized.
E. additive: L260.5mL, L1131.5mL, Cl
-80ppm
Phenomenon: shown in Fig. 5 e, high district 3-4cm crystallization is coarse, and Zhong Di district is smooth, low district adularescent striped.
Conclusion: fixed L 26 is that the amount that 0.5mL increases L113 gradually can find out that although very brightless, crystallization is careful between 10ASD-4ASD when L113 amount is for 1mL.
Reach a conclusion from above experiment, the ratio suitably regulating L26 and L113 to add can obtain different electroplating effects.
(5) continuous current plating
Current density: 5asd
Thickness of coating: 5 μm
Electroplating time: 4.5min
Calculated by Faraday's law, the electroplating efficiency being leveling agent with L113 molecule can reach 99.7%
Shown in Figure 6, from test piece quality of coating, surface-brightening, planarization is better.But viewed from plating result, the brighter brightness of 2ASD and 12ASD does not have 5ASD good, and current density operation scope can within 2ASD to 12ASD.
By to the selected of molecular structure and condition optimizing experiment, we demonstrate the possibility of types of molecules described in the invention as sour copper electroplating technology leveling agent, and to be tested by Hull groove related system and the assessment of plating performance has been carried out in continuous current plating.
Above-described embodiment, just in order to technical conceive of the present invention and feature are described, its objective is and is one of ordinary skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.The change of every equivalence done by the essence of content of the present invention or modification, all should be encompassed in protection scope of the present invention.