Anti-discoloration treatment method for inflating valve of butyl inner tube

Abstract

The invention discloses an anti-discoloration treatment method for an inflating valve of a butyl inner tube. Comprising the following steps: (1) soaking treatment of a metal corrosion inhibitor treatment solution: soaking a copper rod body of the butyl inner tube inflating valve into the metal corrosion inhibitor treatment solution, keeping a rubber mat of the butyl inner tube inflating valve to be completely isolated from the metal corrosion inhibitor treatment solution, standing, soaking for 2-10 minutes, then taking out the copper rod body of the butyl inner tube inflating valve, and carrying out natural or hot air drying; and (2) anti-rust oil soaking treatment is conducted, specifically, the copper rod body of the butyl inner tube inflating valve dried in the step (1) is soaked in anti-rust oil, a rubber mat of the butyl inner tube inflating valve is kept to be completely isolated from the anti-rust oil, the butyl inner tube inflating valve is rotated 2-3 times and soaked for 0.5-2 min, and then the copper rod body of the butyl inner tube inflating valve is taken out and naturally aired. According to the anti-discoloration treatment method for the inflating valve of the butyl inner tube, the corrosion resistance of the copper rod body of the inflating valve is improved, electrochemical corrosion is avoided, and the problem that the inflating valve becomes black due to corrosion is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of butyl inner tube valve protection in the rubber industry, and specifically to a method for preventing discoloration of butyl inner tube valve nozzles. Background Art

[0002] The tire valve nozzle is an important component of the inner tube, generally made of brass, mainly including ordinary brass H62, lead brass HPb59-1, etc., and is connected to the inner tube body as a whole through an inner nozzle rubber gasket. For butyl inner tube valve nozzles, the adhesion between the butyl rubber gasket and metals such as brass is mainly achieved by the bonding of copper atoms and sulfur atoms. Therefore, it is necessary to vulcanize the finished valve nozzle to increase the content of sulfur atoms that can participate in bonding in the rubber matrix of the gasket. Butyl rubber has a high degree of saturation and a low degree of vulcanization. During the vulcanization process, part of the added sulfur will escape in the form of acidic gases, thus forming a corrosive atmosphere. In particular, when the relative humidity of the air exceeds 75%, an invisible water molecule film will form on the surface of the valve nozzle copper rod body. Under the action of soluble electrolytes, oxygen, and corrosive gases existing in the surface environment, the valve nozzle copper rod body undergoes electrochemical corrosion and discolors. In a high-temperature and high-humidity environment, the electrochemical corrosion rate of the valve nozzle copper rod body is much greater than the simple chemical corrosion rate under dry conditions, and the valve nozzle copper rod body is more likely to be corroded and turn black. The relative increase in the blackening of butyl inner tube valve nozzles after being in a high-temperature and high-humidity environment and long-term storage has become a common problem in the valve nozzle manufacturing and application industries. However, given the current butyl rubber vulcanization system, the corrosion and discoloration of butyl inner tube valve nozzles can only take corresponding protective measures and cannot be completely cured.

[0003] Inhibitors can undergo physical or chemical reactions on the metal surface to form a protective film, reduce the corrosion rate of the metal surface, delay or prevent the metal from being corroded in the environment, and protect the integrity and service life of the metal surface. Rust preventive oil is an industrial liquid designed to prevent metal corrosion and rust, mainly based on a base oil (or water) as the main system, combined with inhibitors, auxiliary additives, etc., and can form a dense and strongly bonded protective film on the metal surface to effectively prevent metal corrosion. Currently, inhibitors or rust preventive oils have not been applied to butyl inner tube valve nozzles to achieve the effect of avoiding electrochemical corrosion and rust prevention. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for preventing discoloration of butyl inner tube valve nozzles, improve the corrosion resistance of the valve nozzle copper rod body, avoid electrochemical corrosion, and solve the problem of the valve nozzle turning black due to corrosion.

[0005] To achieve the above object, the present invention provides a method for preventing discoloration of butyl inner tube valve nozzles, including the following steps: 1) Immersion treatment with metal corrosion inhibitor treatment solution: Immerse the copper rod of the butyl inner tube valve nozzle into the metal corrosion inhibitor treatment solution, keeping the rubber gasket of the butyl inner tube valve nozzle completely isolated from the metal corrosion inhibitor treatment solution, stand still, immerse for 2 - 10 min, then take out the copper rod of the butyl inner tube valve nozzle and dry it naturally or by hot air; 2) Immersion treatment with rust preventive oil: Immerse the copper rod of the butyl inner tube valve nozzle dried in step 1) into the rust preventive oil, keeping the rubber gasket of the butyl inner tube valve nozzle completely isolated from the rust preventive oil, rotate the butyl inner tube valve nozzle 2 - 3 times, immerse for 0.5 - 2 min, then take out the copper rod of the butyl inner tube valve nozzle and dry it naturally.

[0006] Further, in the above method for preventing discoloration of the butyl inner tube valve nozzle, the concentration of the metal corrosion inhibitor treatment solution is 0.1 wt% - 1 wt%.

[0007] Further, in the above method for preventing discoloration of the butyl inner tube valve nozzle, the temperature for natural drying is 20 - 40 °C, and the drying time is 30 - 120 min.

[0008] Further, in the above method for preventing discoloration of the butyl inner tube valve nozzle, the temperature for hot air drying is 55 - 75 °C, and the drying time is 10 - 30 min.

[0009] Further, in the above method for preventing discoloration of the butyl inner tube valve nozzle, the method for preventing discoloration is divided into two steps. The first step is immersion treatment with metal corrosion inhibitor treatment solution, and the second step is immersion treatment with rust preventive oil. The method for preventing discoloration also includes any independent treatment of immersion treatment with metal corrosion inhibitor treatment solution and immersion treatment with rust preventive oil.

[0010] Compared with the prior art, the present invention has the following beneficial effects: At a trace or small concentration, the metal corrosion inhibitor undergoes physical or chemical reactions with the surface of the copper rod of the butyl inner tube valve nozzle, forming a very thin, non - destructible passivation film layer with good corrosion resistance on the surface of the copper rod of the butyl inner tube valve nozzle, protecting the metal surface and reducing various forms of corrosion; the rust preventive oil forms a dense film layer on the surface of the copper rod of the butyl inner tube valve nozzle through physical or chemical adsorption. The film layer has strong bonding force and strong salt spray resistance, isolating the contact and entry of oxygen, corrosive gases, moisture, etc., effectively preventing the corrosion of the copper rod by external substances; the combined action of the two formed film layers improves the corrosion resistance of the valve nozzle copper rod, avoids electrochemical corrosion, and solves the problem of the valve nozzle turning black due to corrosion. Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the appearance of the butyl inner tube valve nozzle after 96 - hour neutral salt spray test (GB / T 10125 - 2012) without being treated by the present invention.

[0012] Figure 2 It is a schematic diagram of the appearance of the butyl inner tube valve after 96-hour neutral salt spray test (GB / T 10125-2012) processed by the present invention. Specific embodiments

[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0014] A method for preventing discoloration of a butyl inner tube valve includes the following steps: 1) Immersion treatment with a metal corrosion inhibitor treatment solution: Immerse the copper rod of the butyl inner tube valve in the metal corrosion inhibitor treatment solution, keeping the rubber gasket of the butyl inner tube valve completely isolated from the metal corrosion inhibitor treatment solution, stand still, soak for 2-10 minutes, and then take out the copper rod of the butyl inner tube valve and dry it naturally or by hot air; 2) Immersion treatment with rust preventive oil: Immerse the copper rod of the butyl inner tube valve dried in step 1) in the rust preventive oil, keeping the rubber gasket of the butyl inner tube valve completely isolated from the rust preventive oil, rotate the butyl inner tube valve 2-3 times, soak for 0.5-2 minutes, and then take out the copper rod of the butyl inner tube valve and air dry it;

[0015] The concentration of the metal corrosion inhibitor treatment solution is 0.1 wt% - 1 wt%;

[0016] The temperature for natural drying is 20-40 °C, and the drying time is 30-120 minutes;

[0017] The temperature for hot air drying is 55-75 °C, and the drying time is 10-30 minutes;

[0018] The steps of the anti-discoloration treatment method are divided into two steps. The first step is the immersion treatment with the metal corrosion inhibitor treatment solution, and the second step is the immersion treatment with the rust preventive oil. The anti-discoloration treatment method also includes any independent treatment of the immersion treatment with the metal corrosion inhibitor treatment solution and the immersion treatment with the rust preventive oil.

[0019] From Figure 1 、 Figure 2In contrast, after the copper rod body of the butyl inner tube valve nozzle treated by the anti-discoloration treatment method for the butyl inner tube valve nozzle disclosed in the present invention undergoes a 96-hour neutral salt spray test (GB / T 10125-2012), the appearance color is yellow, with luster, and there is no dirt, dullness or discoloration on the surface, having excellent salt spray resistance and corrosion resistance characteristics. For the anti-discoloration treatment method for the butyl inner tube valve nozzle disclosed in the present invention, the metal corrosion inhibitor undergoes physical or chemical reactions with the surface of the copper rod body of the butyl inner tube valve nozzle at a trace or small concentration, forming a very thin, non-destructible and passivation film layer with good corrosion resistance on the surface of the copper rod body of the butyl inner tube valve nozzle to protect the metal surface and reduce various forms of corrosion; the rust preventive oil forms a dense film layer on the surface of the copper rod body of the butyl inner tube valve nozzle through physical or chemical adsorption, the film layer has strong bonding force and strong salt spray resistance, isolating the contact and entry of oxygen, corrosive gases, moisture, etc., effectively preventing the copper rod body from being corroded by external substances; the combined action of the two formed film layers improves the corrosion resistance of the copper rod body of the valve nozzle, avoids electrochemical corrosion, and solves the problem of the valve nozzle turning black due to corrosion.

[0020] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A method for preventing discoloration of a butyl inner tube valve, characterized in that: The following steps are involved: 1) Soaking treatment of metal corrosion inhibitor treatment liquid: immerse the copper rod of the butyl inner tube valve into the metal corrosion inhibitor treatment liquid, keep the rubber pad of the butyl inner tube valve completely isolated from the metal corrosion inhibitor treatment liquid, let it stand and soak for 2-10 minutes, then take out the copper rod of the butyl inner tube valve and dry it naturally or with hot air; 2) Anti-rust oil immersion treatment: immerse the copper rod of the butyl inner tube valve after drying in step 1) into the anti-rust oil, keep the rubber pad of the butyl inner tube valve completely isolated from the anti-rust oil, rotate the butyl inner tube valve 2-3 times, soak for 0.5-2 minutes, then take out the copper rod of the butyl inner tube valve and dry it naturally.

2. The method for preventing discoloration of a butyl inner tube valve according to claim 1, characterized in that: The concentration of the metal corrosion inhibitor treatment solution is 0.1wt%-1wt%.

3. The method for preventing discoloration of a butyl inner tube valve according to claim 1, characterized in that: The natural drying temperature is 20-40° C., and the drying time is 30-120 min.

4. The method for preventing discoloration of a butyl inner tube valve according to claim 1, characterized in that: The hot air drying temperature is 55-75° C., and the drying time is 10-30 minutes.

5. The method for preventing discoloration of a butyl inner tube valve according to claim 1, characterized in that: The anti-discoloration treatment method comprises two steps, the first step is immersion treatment with metal corrosion inhibitor treatment liquid, and the second step is immersion treatment with anti-rust oil. The anti-discoloration treatment method also includes any independent treatment of immersion treatment with metal corrosion inhibitor treatment liquid and immersion treatment with anti-rust oil.

6. A method for preventing discoloration of a butyl inner tube valve, characterized in that: The anti-discoloration treatment method includes the anti-discoloration treatment method according to any one of claims 1 to 5.

Images