How to solve the whitening and spitting frost on the rubber surface?

The surface of the rubber products we usually come into contact with is whitish, that is, a hoarfrost-like substance is formed on the surface, professionally speaking, the rubber surface is frosted, under normal circumstances, this situation will not affect the function of the product, but will affect the appearance quality. There are many reasons for the formation of whitish rubber surfaces, among which the more common ones are:

1.The rubber product formula itself has a problem, a certain component is too much, especially the accelerator or vulcanizing agent and the like, resulting in false saturation vulcanization of rubber, at natural temperature, the molecule is still cross-linked, after the cross-linking is completed, the extra part of the substance will precipitate out of the surface, forming a rubber surface spit frost.

2.When there is a problem in the process of producing rubber products, the correct formula will also occur after the process change, such as the sulfurization time is too short, the temperature setting is too high, resulting in false vulcanization.

3.For example, in many rubber mat formulations, we usually increase the amount of paraffin wax to form a protective wax substance when it is used in the later stage, which is the result of making full use of the characteristics of rubber.

This is called the phenomenon of spitting frost spraying whitening, rubber spraying frost.

Source. Spray frost. Frosting is the liquid or solid inside the rubber compound or vulcanized rubber.

The phenomenon that the body compounding agent precipitates on the surface of rubber products due to migration to form a cloud-like or white powder substance.

IntroductionThis is caused by the use of sulfur, paraffin, certain antioxidants, softeners in excess of their solubility in rubber. In order to prevent frosting, the dosage of the above-mentioned various compounding agents should be appropriate, and insoluble sulfur spraying can be used to prevent common sulfur spraying. Pine tar and liquid coumarone can be added to the rubber to increase the solubility of the rubber compound to the above-mentioned compounding agent to reduce the frosting phenomenon.

Definition and origin.

Frosting, also known as blooming, is a common quality problem in rubber processing, which refers to the phenomenon that the compounding agent contained in the unvulcanized rubber or vulcanized rubber migrates to the surface and precipitates. Sometimes, this ejecta is a frost-like crystalline, so it is customary to call it "frosting". The most common frost spray is sulfur, because sulfur is the most widely used vulcanizing agent in general rubber, and its low solubility in rubber makes it easy to produce frosting.

In fact, from the appearance of the ejectatum, it may not all be frosty, but there are also oily (softeners, plasticizers) or powdery particles (mostly fillers, antioxidants, accelerators, etc.) substances sprayed, and even carbon black sprays are also seen.

Rubber spraying, including rubber surface spraying and product surface spraying. Frosting is a liquid or solid compounding agent made of rubber.

The right phenomenon of the internal version migrating to the rubber surface is the precipitation of the rubber internal compounding agent.

For the frosting problem on the surface of rubber products, Siyuan Shoe Materials Co., Ltd. has developed a corresponding treatment agent product: rubber frost and yellowing treatment agent SY-210C series, which can fully clean and maintain the original surface of rubber products.

The secondary processing of the product can also increase the adhesion of the surface of the rubber substrate.

Operation method: Directly use an acid-alkali resistant toothbrush, moisten the spit cream and spit yellow treatment agent, and then scrub vigorously. When the frost and yellowing are severe, the operation can be repeated after drying. After drying in the oven, the packaging is sealed and set aside.

1. After the processing and drying of the product, it must be packed and sealed, and placed in a cool and dry place to store it away from sunlight.

Direct irradiation, 2. For rubber products with frost and yellowing, after treatment, the air and temperature of the storage place must be controlled.

and humidity conditions, 3. Leave the warehouse as soon as possible, do not store for a long time, and reduce the aging opportunity of rubber products.

Rubber hoarfrost is a manifestation of rubber frosting, which is a white precipitate formed on the surface of one or several precipitated products in rubber products.

The treatment method is generally high temperature baking, wiping with silicone oil or wiping with special solvent to inhibit the product from spitting frost again.

The reproduction of products can be solved by formula matching or material analysis.

The so-called "white frost" of rubber products is: after moisture absorption, water droplets will dissolve the water-soluble substances in the formula on the surface of rubber products; After the water evaporates, the water-soluble substance remains on the surface of the rubber. Search:

Therefore, if you want to fundamentally deal with the problem of water beads on the surface of rubber products, the most important thing is to start from the formula, such as changing the formula or paying attention to the amount of alcohol. Secondly, the rubber products can be placed in a dry and ventilated environment to ensure the dryness of the product.

Summary. Kiss! Hello, happy to answer your <>

How to solve the whitening phenomenon of rubber products is as follows: you can put the rubber products that have been sprayed with frost and whiteness outdoors and let them fully spit out white things, and then wipe them clean with chemical solvents such as Tianna water. If this is not possible, you can soak and wipe it with special treated water.

The development of China's rubber products industry In recent years, the output of China's non-tire rubber products has increased significantly year by year, and the amount of rubber consumption has also been increasing. Taking the hose and tape industry as an example, as the second largest rubber products industry in China, it accounts for a large proportion of non-tire rubber products. Hope mine can help you <>

Do you have any other questions?

How to solve the whitening phenomenon of rubber products.

Kiss! Hello, I'm glad to answer your <>

How to solve the whitening phenomenon of rubber products is as follows: you can put the rubber products that have been sprayed with frost and whiteness outdoors and let them fully spit out white things, and then wipe them clean with chemical solvents such as Tianna water. If this is not possible, you can soak and wipe it with special treated water.

In recent years, the output of China's non-tire rubber products has increased significantly year by year, and the amount of rubber consumption has also been increasing. Taking the hose and tape industry as an example, as the second largest rubber products industry in China, it accounts for a large proportion of non-tire rubber products. I hope I can help you <>

Do you have any other questions?

Can you tell me what kind of professional treatment water is, thank you.

The professional treatment of water is precipitation filtration method, distillation method.

Is it okay to treat the surface with silicone oil.

You can't kiss it.

Due to the regulations of the platform, you can't see what you send**Oh for the time being.

The pro-solution is as follows: soak all the spit silica gel products or brush the surface with spitting cream treatment agent, and dry them naturally or tumble dry.

There is no technology to solve it for the time being, you can wipe it with water yourself.

Specific reasons for rubber spraying:

1. Improper formula planning

Full spraying: commonly found in sulfur, accelerators, active agents, antioxidants relocation spraying: commonly found in processing aids, relocation antioxidants.

Antistatic agent generation ejection: commonly found in sulfur vulcanization system accelerator and reaction with reaction products to stay: commonly found in organic peroxide vulcanization system low molecular weight substance excess stress ejection:

Commonly found in inorganic fillers: e.g., calcium carbonate.

2. Improper technical operation

Uneven mixing constitutes poor dispersion, part of the rubber mixing temperature exceeds the fullness, the compounding agent part is excessive, the weighing is inaccurate (more weighing, less weighing, missing weighing, misweighing) The vulcanization temperature is too high, the polymer degradation constitutes the frost spraying vulcanization temperature is too low, the sulfur spraying and vulcanization time is not good for the incomplete reaction, the release agent or mold washing water that constitutes the undersulfur frost spraying is not properly operated, and the rubber appearance is white.

3. The quality of raw materials is different

The quality of raw materials fluctuates due to the different raw materials of origin, different production methods, different technologies, different batches, and different raw materials, and the composition technology of raw rubber: polymerization temperature, catalyst, composition monomer, etc., resulting in different solubility. Changes in purity, moisture, ash, pH, physical properties, etc.

4. Poor temperature of storage conditions:

The solubility of the compounding agent in the rubber usually rises and falls with the rise and fall of temperature (pressure and humidity): the pressure of the rubber during storage, the humidity of the surrounding air and the time also have an impact on the solubility of the compounding agent, and usually have little effect. However, if the pressure is high, the compounding agent in the rubber at the pressure part will form a crystal nucleus, which will be separated from the rubber surface and constitute frosting;

If the humidity of the air is too large, the effect of the polar compounding agent in the rubber on the raw rubber (non-polar) will be weakened, and the solubility of the compounding agent will be reduced, and then the frost will be sprayed; The longer the storage time, the more significant the frosting on the rubber surface, because the temperature and humidity of the air in the storage environment are different with the change of the season, and the difference is larger, which is easy to cause the solubility of the compounding agent to change, and then cause the frosting.

5. Rubber aging

Rubber aging mostly causes damage to the intact and balanced network structure of vulcanized rubber, and then also damages the chemical or physical relationship between various compounding agents and raw rubber molecules and compounding agents in the rubber system, and reduces the solubility of compounding agents in the rubber system. As a result, those compounds that are partially in a state of over-plumpness will be separated from the rubber and form a frost spray.