阅读说明：本技术 一种单锡盐快速着色添加剂及着色液 (Single-tin-salt quick coloring additive and coloring liquid ) 是由 夏良文 王相刚 肖茂强 魏聪 于 2020-11-16 设计创作，主要内容包括：本发明公开了一种单锡盐快速着色添加剂及着色液。该着色添加剂的原料包括：L-酒石酸、硼酸、硫酸镁、铁络合物、聚乙二醇、山梨醇、柠檬酸；并基于该添加剂进而提出了一种着色液。本发明的着色添加剂相比于传统试剂更加环保、着色性能更好、工艺成本更低；其与硫酸亚锡组成的着色液能够应用在各类金属材料表面,市场前景良好。(The invention discloses a single tin salt rapid coloring additive and a coloring liquid. The coloring additive comprises the following raw materials: l-tartaric acid, boric acid, magnesium sulfate, iron complex, polyethylene glycol, sorbitol and citric acid; and further provides a coloring liquid based on the additive. Compared with the traditional reagent, the coloring additive is more environment-friendly, has better coloring performance and lower process cost; the coloring liquid formed by the coloring agent and stannous sulfate can be applied to the surfaces of various metal materials, and has good market prospect.)

1. The quick coloring additive of the monostannium salt is characterized in that the raw materials comprise: l-tartaric acid, boric acid, magnesium sulfate, iron complex, polyethylene glycol, sorbitol and citric acid.

2. The rapid monostannate coloring additive of claim 1 wherein the iron complex includes at least one of ferric ammonium oxalate and ferric ammonium sulfate.

3. The rapid coloring additive of monostannium salt according to claim 1, characterized in that the raw materials thereof comprise, in parts by weight: 25-35 parts of L-tartaric acid, 10-20 parts of boric acid, 1-5 parts of magnesium sulfate, 15-25 parts of iron complex, 0.5-2 parts of polyethylene glycol, 1-3 parts of sorbitol and 25-35 parts of citric acid.

4. The rapid coloring additive of monostannium salt according to claim 3, characterized in that the raw materials thereof comprise, in parts by weight: 30 parts of L-tartaric acid, 12 parts of boric acid, 2 parts of magnesium sulfate, 21 parts of iron complex, 1 part of polyethylene glycol, 2 parts of sorbitol and 32 parts of citric acid.

5. The rapid coloring additive of monostannium salt according to claim 3, characterized in that the raw materials thereof comprise, in parts by weight: 25 parts of L-tartaric acid, 18 parts of boric acid, 5 parts of magnesium sulfate, 16 parts of iron complex, 0.5 part of polyethylene glycol, 1 part of sorbitol and 26 parts of citric acid.

6. The rapid coloring additive of monostannium salt according to claim 3, characterized in that the raw materials thereof comprise, in parts by weight: 34 parts of L-tartaric acid, 15 parts of boric acid, 3 parts of magnesium sulfate, 24 parts of iron complex, 2 parts of polyethylene glycol, 3 parts of sorbitol and 35 parts of citric acid.

7. A liquid for rapid coloring of a monostannnum salt, comprising the rapid coloring additive of a monostannnum salt according to any one of claims 1 to 6.

8. The rapid coloring liquid of claim 7, further comprising stannous sulfate.

9. The rapid coloring liquid of stannous salt according to claim 8, wherein the concentration of stannous sulfate is 8-12 g/L, and the concentration of the rapid coloring additive of stannous salt is 35-45 g/L.

Technical Field

The invention belongs to the field of electrolytic coloring, and particularly relates to a single tin salt rapid coloring additive and a coloring liquid.

Background

Electrolytic coloring is a common process in industry, and in the traditional electrolytic coloring process, double-salt coloring liquid of nickel sulfate and stannous sulfate is mostly adopted, but with the continuous emphasis on environmental protection requirements, the use of nickel sulfate is more and more limited. However, if stannous sulfate is used as the monosalt coloring liquid, the coloring performance is remarkably reduced, the problems of poor dispersibility, uneven coloring, unstable process and the like are suddenly caused, and the process cost is also greatly improved. In addition, the traditional coloring additive generally adds DL-tartaric acid as a complexing agent, and adds hydroquinone, catechol, phenolsulfonic acid, pyridine and the like as a reducing agent, but the COD in the water body can be obviously increased after the DL-tartaric acid is discharged, if the addition amount of the DL-tartaric acid is reduced, the complexing performance is insufficient, stannous sulfate is unstable, the coloring performance is deteriorated along with the COD, meanwhile, the solubility of the DL-tartaric acid is poor, the addition amount is too much, the supersaturation crystallization is easy, and the coloring performance is also reduced, which is one reason why the traditional coloring system needs to adopt a double-salt coloring system of stannous sulfate and nickel sulfate; in addition, the phenolic reducing agent has high toxicity and great harm to human body and environment.

Therefore, the single tin salt electrolytic coloring additive and the coloring liquid which are more environment-friendly, more excellent in coloring performance and good in solubility are provided, and are important for the electrolytic coloring process.

Disclosure of Invention

The invention aims to provide a single tin salt rapid coloring additive, which at least solves one of the technical problems, and is realized by the following technical scheme:

a single tin salt quick coloring additive comprises the following raw materials: l-tartaric acid, boric acid, magnesium sulfate, iron complex, polyethylene glycol, sorbitol and citric acid.

Compared with DL-tartaric acid, the L-tartaric acid adopted by the invention has stronger complexing ability and better solubility, does not increase COD (chemical oxygen demand) of a water body after being discharged, can achieve the coloring performance of a double-salt system with smaller addition amount, is more environment-friendly, further reduces the process cost and can ensure excellent coloring performance; meanwhile, the iron complex is used as a reducing agent, so that the harm of the traditional phenol reducing agent to human bodies and the environment is avoided. In addition, boric acid is added to be used as a buffering agent and a dispersing agent, so that coloring can be carried out in a mild pH environment, the solubility of a coloring additive is further improved, polyethylene glycol with a synergistic effect with the boric acid is selected to be used as one of raw materials, the surface activity of the solution and the surface gloss of a colored test piece are improved, the colored test piece is bright in color and not dark, and in addition, magnesium sulfate is added to reduce internal resistance, so that the coloring speed of the electrolytic coloring liquid is higher, and the dispersibility is better; sorbitol and citric acid are added to serve as complexing agents, sorbitol can adjust the viscosity of the electrolytic coloring liquid and fill up micropores on the surface of the test piece to be colored, and citric acid can serve as a reducing agent to inhibit hydrolysis of stannous.

The coloring additive can be used for the surface coloring of various metal materials, in particular to the surface coloring after the aluminum profile is oxidized.

In some preferred embodiments, the iron complex comprises at least one of ferric oxalate amine and ferric sulfate amine.

According to the practical application, in some preferred embodiments, the coloring additive comprises the following raw materials in parts by weight: 25-35 parts of L-tartaric acid, 10-20 parts of boric acid, 1-5 parts of magnesium sulfate, 15-25 parts of iron complex, 0.5-2 parts of polyethylene glycol, 1-3 parts of sorbitol and 25-35 parts of citric acid.

In some preferred embodiments, the coloring additive comprises the following raw materials in parts by weight: 30 parts of L-tartaric acid, 12 parts of boric acid, 2 parts of magnesium sulfate, 21 parts of iron complex, 1 part of polyethylene glycol, 2 parts of sorbitol and 32 parts of citric acid.

In some preferred embodiments, the coloring additive comprises the following raw materials in parts by weight: 25 parts of L-tartaric acid, 18 parts of boric acid, 5 parts of magnesium sulfate, 16 parts of iron complex, 0.5 part of polyethylene glycol, 1 part of sorbitol and 26 parts of citric acid.

In some preferred embodiments, the coloring additive comprises the following raw materials in parts by weight: 34 parts of L-tartaric acid, 15 parts of boric acid, 3 parts of magnesium sulfate, 24 parts of iron complex, 2 parts of polyethylene glycol, 3 parts of sorbitol and 35 parts of citric acid.

The invention also provides a single tin salt quick coloring liquid which comprises the coloring additive. The coloring liquid also comprises stannous sulfate.

According to the preferable conditions of practical application, the concentration of the stannous sulfate is 8-12 g/L, the concentration of the free sulfuric acid is 15-20 g/L, and the concentration of the monostannnum salt electrolysis coloring additive is 35-45 g/L.

The invention has the beneficial effects that: compared with the traditional reagent, the coloring additive is more environment-friendly, has better coloring performance and lower process cost; the coloring liquid formed by the coloring agent and stannous sulfate can be applied to the surfaces of various metal materials, and has good market prospect.

Detailed Description

The concept and technical effects of the present invention will be clearly and completely described in the following embodiments to fully understand the objects, aspects and effects of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

Example 1:

the quick coloring additive of the monostannate comprises the following raw materials in parts by weight: 30 parts of L-tartaric acid, 12 parts of boric acid, 2 parts of magnesium sulfate, 21 parts of iron complex, 1 part of polyethylene glycol, 2 parts of sorbitol and 32 parts of citric acid.

And (3) taking the raw materials according to the parts by weight, and uniformly mixing to obtain the coloring additive.

Example 2:

the quick coloring additive of the monostannate comprises the following raw materials in parts by weight: 25 parts of L-tartaric acid, 18 parts of boric acid, 5 parts of magnesium sulfate, 16 parts of iron complex, 0.5 part of polyethylene glycol, 1 part of sorbitol and 26 parts of citric acid.

And (3) taking the raw materials according to the parts by weight, and uniformly mixing to obtain the coloring additive.

Example 3:

the quick coloring additive of the monostannate comprises the following raw materials in parts by weight: 34 parts of L-tartaric acid, 15 parts of boric acid, 3 parts of magnesium sulfate, 24 parts of iron complex, 2 parts of polyethylene glycol, 3 parts of sorbitol and 35 parts of citric acid.

And (3) taking the raw materials according to the parts by weight, and uniformly mixing to obtain the coloring additive.

Example 4:

respectively mixing the coloring additives prepared in the embodiments 1 to 3 with stannous sulfate to obtain coloring liquid, wherein the coloring liquid comprises the following components: the concentration of stannous sulfate is 8-12 g/L, the concentration of free sulfuric acid is 15-20 g/L, the concentration of the monostannnum salt electrolysis coloring additive is 35-45 g/L, and the balance is water.

The coloring liquid obtained by mixing the coloring additive of the nickel sulfate and stannous sulfate system in the prior art with nickel sulfate and stannous sulfate is used as a comparative example 1. The coloring liquid obtained by mixing the coloring additive in the prior art for the electrolysis of the monostannate with stannous sulfate was used as comparative example 2.

Respectively carrying out electrolytic coloring on the same batch of oxidized aluminum profiles by using the coloring liquid obtained in the examples 1-3 and the coloring liquid obtained in the comparative examples 1-2, wherein the coloring process parameters are as follows: the coloring voltage is 16-20V, and the coloring temperature is 17-23 ℃; the results are shown in table 1:

TABLE 1

After coloring, the waste liquid is discharged to a water body, and the detection on the discharged water body shows that compared with the water body before discharging, the COD in the comparative example 1 is obviously increased, and various chemical components harmful to the environment and human bodies, such as heavy metal, ammonia nitrogen and the like, are simultaneously detected, and although the heavy metal components are not detected in the comparative example 2, higher ammonia nitrogen content is detected, so that the COD is obviously increased; no obvious change of COD is found in the embodiments 1-3, and no harmful chemical components such as heavy metal, ammonia nitrogen and the like exist; this also indicates that the coloring additive of the present invention and the coloring liquid obtained therefrom are more environmentally friendly.

In the coloring process, no matter champagne color, bronze color or black color, the coloring rate of the coloring agent is far lower than that of the coloring agent in examples 1-3, and crystallization occurs to different degrees in the coloring agent in comparative examples 1-2, which causes higher cost and lower coloring efficiency in comparative examples 1-2. Meanwhile, the aluminum profile colored by the coloring additive in the embodiment 1-3 has rich surface color, plump and bright color, good uniformity and dispersibility, and better effect than the coloring effect in the comparative example 1-2.

In conclusion, the coloring additive is more environment-friendly, has higher coloring efficiency, lower process cost and more excellent coloring performance.