CN111663156A - Brightener for VCP electroplating and preparation method thereof - Google Patents
Brightener for VCP electroplating and preparation method thereof Download PDFInfo
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- CN111663156A CN111663156A CN202010655958.XA CN202010655958A CN111663156A CN 111663156 A CN111663156 A CN 111663156A CN 202010655958 A CN202010655958 A CN 202010655958A CN 111663156 A CN111663156 A CN 111663156A
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- 238000009713 electroplating Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 47
- 239000000203 mixture Substances 0.000 claims abstract description 44
- 238000007747 plating Methods 0.000 claims abstract description 28
- 239000002738 chelating agent Substances 0.000 claims abstract description 20
- -1 chloropropane amine Chemical class 0.000 claims abstract description 20
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004327 boric acid Substances 0.000 claims abstract description 16
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 claims description 28
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 claims description 24
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims description 24
- RGCKGOZRHPZPFP-UHFFFAOYSA-N alizarin Chemical compound C1=CC=C2C(=O)C3=C(O)C(O)=CC=C3C(=O)C2=C1 RGCKGOZRHPZPFP-UHFFFAOYSA-N 0.000 claims description 24
- 150000001412 amines Chemical class 0.000 claims description 23
- 239000000243 solution Substances 0.000 claims description 16
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000004698 Polyethylene Substances 0.000 claims description 12
- 239000001045 blue dye Substances 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 229920000768 polyamine Polymers 0.000 claims description 12
- 229920000573 polyethylene Polymers 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 150000003512 tertiary amines Chemical class 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 238000005282 brightening Methods 0.000 claims description 8
- 229920002755 poly(epichlorohydrin) Polymers 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000003431 cross linking reagent Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical group O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 abstract description 5
- 230000002378 acidificating effect Effects 0.000 abstract description 2
- 239000007800 oxidant agent Substances 0.000 abstract description 2
- 230000001590 oxidative effect Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 239000003921 oil Substances 0.000 description 5
- LRWZZZWJMFNZIK-UHFFFAOYSA-N 2-chloro-3-methyloxirane Chemical compound CC1OC1Cl LRWZZZWJMFNZIK-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005202 decontamination Methods 0.000 description 2
- 230000003588 decontaminative effect Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000004595 color masterbatch Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000010730 cutting oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating And Plating Baths Therefor (AREA)
Abstract
The brightener for VCP electroplating contains a leveling agent, polyepoxy chloropropane amine, a curing agent, citric acid, boric acid and a chelating agent, wherein the mixture of weakly acidic substances citric acid and boric acid can effectively remove an oxidant on the surface of a plating layer without calculating the plating layer, the addition of the polyepoxy chloropropane amine can effectively remove dirt on the surface of the plating layer, and the addition of other components ensures that the brightener has reasonable and effective formula components, no pollution in the preparation process, environmental protection and safety.
Description
Technical Field
The invention belongs to the technical field of additives for electroplating, and particularly relates to a brightener for VCP electroplating and a preparation method thereof.
Background
In the industrial industry, when various materials such as plastic, optical glass lenses, metal products (copper, iron, aluminum, steel, zinc, alloy) and the like clean various oil stains, stains and grease such as surface stretching oil, cutting oil, antirust oil, lubricating oil, stamping oil and the like, the cleaning is often needed, and diesel oil, kerosene or gasoline is mostly used as a cleaning solution to clean parts. This is not only wasteful of energy, but also presents a potential unsafe factor that, with some caution, can lead to a fire. In addition, the adopted cleaning agent has the defects of high and low quality, poor integral decontamination performance, easy corrosion damage to human bodies, low safety and poor surface color and luster after decontamination. Therefore, the surface of the metal product is plated with a layer of brightener, so that the metal is not easily polluted by oil stains, and the attractiveness of the metal product is ensured.
Brightener is an additive added into plating solution to obtain bright layer degree. The brightener has good internal and external lubricating performance and surface smoothness, good intersolubility and anti-sticking performance, and can improve the brightness and brightness of the color master batch. Along with the development of science and technology, brightening agents are applied in more and more industries. To obtain a bright coating, the selection of the brightener is the key to the process, and it should have: (1) the stability of the plating solution is better, and a certain deposition rate and a certain service cycle can be maintained; (2) the coating has obvious brightening effect; (3) the original performance of the plating layer can not be reduced; (4) the raw materials have simple composition, proper price and easy popularization and use. However, the operation temperature of the chemical nickel plating system is generally high, and a large amount of hydrogen is continuously separated out from the surface of a substrate in the plating solution, particularly, unlike electroplating, the substrate is not polarized by a cathode, and an electroplating brightener cannot be directly applied to chemical plating, so that the selection of a proper chemical plating brightener is very important.
Disclosure of Invention
In order to solve the problems, the invention provides a brightener for VCP electroplating and a preparation method thereof, the brightener for VCP electroplating has good brightness, is not easy to oxidize and is convenient to use, and the content of the brightener is as follows:
the invention aims to provide a brightener for VCP electroplating, which is characterized in that: the brightener for VCP electroplating comprises the following components in parts by weight: 5-8 parts of leveling agent, 10-20 parts of poly (chloropropylene oxide) amine, 1-3 parts of curing agent, 2-3 parts of citric acid, 2-3 parts of boric acid, 0.1-0.3 part of chelating agent and 75-88 parts of deionized water.
In some embodiments of the present invention, the leveling agent is a mixture of basic yellow and polymeric alizarin alcohol blue dye, and the weight ratio of the basic yellow to the polymeric alizarin alcohol blue dye is 1: 1-3.
In some embodiments of the present invention, the poly (epichlorohydrin) amine is synthesized by using dimethylamine, tertiary amine and epichlorohydrin as raw materials and adding polyethylene polyamine as a crosslinking agent.
In some embodiments of the present invention, the preparation method of the poly (chloropropylene oxide) amine comprises: adding a mixed solution of 30-35 wt% of dimethylamine solution and tertiary amine into a reaction kettle at the constant temperature of 20-40 ℃, slowly dripping epichlorohydrin while stirring, reacting at the constant temperature of 20-40 ℃ for 30-60min after dripping is finished, finally adding polyethylene polyamine, continuously stirring, slowly heating to 60-80 ℃, and reacting for 30-60min to obtain the poly (chloropropylene oxide) amine.
In some embodiments of the present invention, the curing agent is hexamethylene diisocyanate.
In some embodiments of the invention, the chelating agent is a mixture of EDTA-2Na and glycolic acid, and the weight ratio of EDTA-2Na to glycolic acid is 1-3: 1.
It is another object of the present invention to provide a method for preparing a brightener for VCP plating, comprising the steps of:
the method comprises the following steps: adding deionized water and a chelating agent into a container to be dissolved completely to obtain a mixture A;
step two: adding the poly (chloropropylene oxide) amine, the curing agent and the leveling agent into the mixture A obtained in the step one, and dissolving until the mixture is completely dissolved to obtain a mixture B;
step three: and adding citric acid and boric acid into the mixture B in the second step to be dissolved completely to obtain the brightening agent for VCP electroplating.
Compared with the prior art, the invention has the beneficial effects that:
the brightener for VCP electroplating contains a leveling agent, polyepoxy chloropropane amine, a curing agent, citric acid, boric acid and a chelating agent, wherein a weakly acidic substance citric acid and boric acid are mixed to effectively remove an oxidant on the surface of a plating layer without coating, the addition of the polyepoxy chloropropane amine can effectively remove dirt on the surface of the plating layer, and the addition of other components ensures that the formula of the brightener is reasonable and effective in components, the preparation process is pollution-free, environment-friendly and safe, and the brightener has the advantages of good brightness, difficult oxidation, convenient use, good electroplating quality, high brightness of the plating layer, stability, durability and no color change, and has wide popularization and application values and good economic and social benefits.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below so that those skilled in the art can better understand the advantages and features of the present invention, and thus the scope of the present invention will be more clearly defined. The embodiments described herein are only a few embodiments of the present invention, rather than all embodiments, and all other embodiments that can be derived by one of ordinary skill in the art without inventive faculty based on the embodiments described herein are intended to fall within the scope of the present invention.
Example 1
A brightener for VCP electroplating comprises the following components in parts by weight: 6.5 parts by weight of leveling agent, 15 parts by weight of poly (chloropropylene oxide) amine, 2 parts by weight of curing agent, 2.5 parts by weight of citric acid, 2.5 parts by weight of boric acid, 0.2 part by weight of chelating agent and 87.5 parts by weight of deionized water.
The leveling agent is a mixture of basic yellow and polymeric alizarin alcohol blue dye, and the weight ratio of the basic yellow to the polymeric alizarin alcohol blue dye is 1: 2.
Wherein, the poly-epoxy chloropropane amine is synthesized by taking dimethylamine, tertiary amine and epoxy chloropropane as raw materials and adding polyethylene polyamine as a cross-linking agent.
The preparation method of the poly (epichlorohydrin) comprises the following steps: adding a mixed solution of a dimethylamine solution and a tertiary amine with the weight percent of 32.5 into a reaction kettle at the constant temperature of 30 ℃, slowly dripping epichlorohydrin while stirring, reacting at the constant temperature of 30 ℃ for 45min after finishing dripping, finally adding polyethylene polyamine, continuously stirring, slowly heating to 70 ℃, and reacting for 45min to obtain the poly (chloropropylene oxide) amine.
Wherein the curing agent is hexamethylene diisocyanate.
Wherein the chelating agent is a mixture of EDTA-2Na and glycolic acid, and the weight ratio of the EDTA-2Na to the glycolic acid is 2: 1.
According to the formula, the preparation method of the brightener for VCP electroplating comprises the following steps:
the method comprises the following steps: adding deionized water and a chelating agent into a container to be dissolved completely to obtain a mixture A;
step two: adding the poly (chloropropylene oxide) amine, the curing agent and the leveling agent into the mixture A obtained in the step one, and dissolving until the mixture is completely dissolved to obtain a mixture B;
step three: and adding citric acid and boric acid into the mixture B in the second step to be dissolved completely to obtain the brightening agent for VCP electroplating.
Example 2
A brightener for VCP electroplating comprises the following components in parts by weight: 5 parts by weight of leveling agent, 10 parts by weight of poly (chloropropylene oxide) amine, 1 part by weight of curing agent, 2 parts by weight of citric acid, 2 parts by weight of boric acid, 0.1 part by weight of chelating agent and 75 parts by weight of deionized water.
The leveling agent is a mixture of basic yellow and polymeric alizarin alcohol blue dye, and the weight ratio of the basic yellow to the polymeric alizarin alcohol blue dye is 1: 1.
Wherein, the poly-epoxy chloropropane amine is synthesized by taking dimethylamine, tertiary amine and epoxy chloropropane as raw materials and adding polyethylene polyamine as a cross-linking agent.
The preparation method of the poly (epichlorohydrin) comprises the following steps: adding a 30 wt% mixed solution of dimethylamine solution and tertiary amine into a reaction kettle at the constant temperature of 20 ℃, slowly dripping epichlorohydrin while stirring, reacting at the constant temperature of 20 ℃ for 30min after dripping, finally adding polyethylene polyamine, continuously stirring, slowly heating to 60 ℃, and reacting for 30min to obtain the poly (chloropropylene oxide) amine.
Wherein the curing agent is hexamethylene diisocyanate.
Wherein the chelating agent is a mixture of EDTA-2Na and glycolic acid, and the weight ratio of the EDTA-2Na to the glycolic acid is 1: 1.
According to the formula, the preparation method of the brightener for VCP electroplating comprises the following steps:
the method comprises the following steps: adding deionized water and a chelating agent into a container to be dissolved completely to obtain a mixture A;
step two: adding the poly (chloropropylene oxide) amine, the curing agent and the leveling agent into the mixture A obtained in the step one, and dissolving until the mixture is completely dissolved to obtain a mixture B;
step three: and adding citric acid and boric acid into the mixture B in the second step to be dissolved completely to obtain the brightening agent for VCP electroplating.
Example 3
A brightener for VCP electroplating comprises the following components in parts by weight: 8 parts by weight of leveling agent, 20 parts by weight of poly (chloropropylene oxide) amine, 3 parts by weight of curing agent, 3 parts by weight of citric acid, 3 parts by weight of boric acid, 0.3 part by weight of chelating agent and 88 parts by weight of deionized water.
The leveling agent is a mixture of basic yellow and polymeric alizarin alcohol blue dye, and the weight ratio of the basic yellow to the polymeric alizarin alcohol blue dye is 1: 3.
Wherein, the poly-epoxy chloropropane amine is synthesized by taking dimethylamine, tertiary amine and epoxy chloropropane as raw materials and adding polyethylene polyamine as a cross-linking agent.
The preparation method of the poly (epichlorohydrin) comprises the following steps: adding 35 wt% of mixed solution of dimethylamine solution and tertiary amine into a reaction kettle at the constant temperature of 40 ℃, slowly dripping epichlorohydrin while stirring, reacting at the constant temperature of 40 ℃ for 60min after dripping, finally adding polyethylene polyamine, continuously stirring, slowly heating to 80 ℃, and reacting for 60min to obtain the poly (chloropropylene oxide) amine.
Wherein the curing agent is hexamethylene diisocyanate.
Wherein the chelating agent is a mixture of EDTA-2Na and glycolic acid, and the weight ratio of the EDTA-2Na to the glycolic acid is 3: 1.
According to the formula, the preparation method of the brightener for VCP electroplating comprises the following steps:
the method comprises the following steps: adding deionized water and a chelating agent into a container to be dissolved completely to obtain a mixture A;
step two: adding the poly (chloropropylene oxide) amine, the curing agent and the leveling agent into the mixture A obtained in the step one, and dissolving until the mixture is completely dissolved to obtain a mixture B;
step three: and adding citric acid and boric acid into the mixture B in the second step to be dissolved completely to obtain the brightening agent for VCP electroplating.
Example 4
A brightener for VCP electroplating comprises the following components in parts by weight: 6 parts by weight of leveling agent, 12 parts by weight of poly (chloropropylene oxide) amine, 2 parts by weight of curing agent, 2 parts by weight of citric acid, 3 parts by weight of boric acid, 0.2 part by weight of chelating agent and 80 parts by weight of deionized water.
The leveling agent is a mixture of basic yellow and polymeric alizarin alcohol blue dye, and the weight ratio of the basic yellow to the polymeric alizarin alcohol blue dye is 1: 2.
Wherein, the poly-epoxy chloropropane amine is synthesized by taking dimethylamine, tertiary amine and epoxy chloropropane as raw materials and adding polyethylene polyamine as a cross-linking agent.
The preparation method of the poly (epichlorohydrin) comprises the following steps: adding a mixed solution of 33 wt% of dimethylamine solution and tertiary amine into a reaction kettle at the constant temperature of 30 ℃, slowly dripping epichlorohydrin while stirring, reacting at the constant temperature of 30 ℃ for 45min after dripping, finally adding polyethylene polyamine, continuously stirring, slowly heating to 70 ℃, and reacting for 45min to obtain the poly (chloropropylene oxide) amine.
Wherein the curing agent is hexamethylene diisocyanate.
Wherein the chelating agent is a mixture of EDTA-2Na and glycolic acid, and the weight ratio of the EDTA-2Na to the glycolic acid is 2: 1.
According to the formula, the preparation method of the brightener for VCP electroplating comprises the following steps:
the method comprises the following steps: adding deionized water and a chelating agent into a container to be dissolved completely to obtain a mixture A;
step two: adding the poly (chloropropylene oxide) amine, the curing agent and the leveling agent into the mixture A obtained in the step one, and dissolving until the mixture is completely dissolved to obtain a mixture B;
step three: and adding citric acid and boric acid into the mixture B in the second step to be dissolved completely to obtain the brightening agent for VCP electroplating.
Comparative example 1
In this comparative example, no "poly (epichlorohydrin) amine was present, and the contents and operation of other materials were the same as in example 1.
Examples of the experiments
The brightener for VCP plating prepared in examples 1 to 4 and the brightener for VCP plating prepared in comparative example 1 were added to the plating solution, and the plating solution to which the brightener for the plating solution was added was plated on the surface of the iron piece, and at the same time, the plating solution to which the brightener for the plating solution was not added was plated on the surface of the iron piece to form comparative example 2, and the glossiness of the surface of the iron piece was measured to obtain the results shown in table 1:
TABLE 1
| Surface gloss | |
| Example 1 | High glossiness |
| Example 2 | High glossiness |
| Example 3 | High glossiness |
| Example 4 | High glossiness |
| Comparative example 1 | Relatively glossy |
| Comparative example 2 | Low gloss |
The present invention provides only one brightener for VCP electroplating and its preparation method, and many methods and ways for implementing the technical scheme, and the above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should be regarded as the protection scope of the present invention, and all the components not specified in the embodiment can be implemented by the prior art.
Claims (7)
1. A brightener for VCP plating, characterized by: the brightener for VCP electroplating comprises the following components in parts by weight: 5-8 parts of leveling agent, 10-20 parts of poly (chloropropylene oxide) amine, 1-3 parts of curing agent, 2-3 parts of citric acid, 2-3 parts of boric acid, 0.1-0.3 part of chelating agent and 75-88 parts of deionized water.
2. A brightener for VCP plating according to claim 1, wherein: the leveling agent is a mixture of basic yellow and polymeric alizarin alcohol blue dye, and the weight ratio of the basic yellow to the polymeric alizarin alcohol blue dye is 1: 1-3.
3. A brightener for VCP plating according to claim 1, wherein: the poly (epichlorohydrin) amine is synthesized by taking dimethylamine, tertiary amine and epichlorohydrin as raw materials and adding polyethylene polyamine as a cross-linking agent.
4. A brightener for VCP plating according to claim 3, wherein: the preparation method of the poly (chloropropylene oxide) amine comprises the following steps: adding a mixed solution of 30-35 wt% of dimethylamine solution and tertiary amine into a reaction kettle at the constant temperature of 20-40 ℃, slowly dripping epichlorohydrin while stirring, reacting at the constant temperature of 20-40 ℃ for 30-60min after dripping is finished, finally adding polyethylene polyamine, continuously stirring, slowly heating to 60-80 ℃, and reacting for 30-60min to obtain the poly (chloropropylene oxide) amine.
5. A brightener for VCP plating according to claim 1, wherein: the curing agent is hexamethylene diisocyanate.
6. A brightener for VCP plating according to claim 1, wherein: the chelating agent is a mixture of EDTA-2Na and glycolic acid, and the weight ratio of the EDTA-2Na to the glycolic acid is 1-3: 1.
7. A brightener for VCP plating according to any one of claims 1 to 6, characterized in that: the preparation method of the brightener for VCP electroplating comprises the following steps:
the method comprises the following steps: adding deionized water and a chelating agent into a container to be dissolved completely to obtain a mixture A;
step two: adding the poly (chloropropylene oxide) amine, the curing agent and the leveling agent into the mixture A obtained in the step one, and dissolving until the mixture is completely dissolved to obtain a mixture B;
step three: and adding citric acid and boric acid into the mixture B in the second step to be dissolved completely to obtain the brightening agent for VCP electroplating.
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