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Why do silica gel products appear dark marks_what to do after silica gel products appear dark marks

Release time:

2019-05-17 12:30

Source:

Silicone ProductsWhy do dark marks appear_what to do after dark marks appear on silicone products
 
What is the reason for the appearance of dark marks on the surface of silicone products? Before, I told you about the causes of dark marks, lack of materials and vulcanization marks on the surface appearance of the product. This phenomenon is one of the most unacceptable factors for customers and consumers in the processing technology of silicone products. The factors that cause the poor surface of the finished silicone products are relatively extensive, and the components occupied in the molding and vulcanization process are relatively extensive, so for the appearance of poor surface treatment methods need to go from where to solve it?
Although the main proportion of surface defects in the production process of silicone products processing manufacturers is in the molding and vulcanization process, it is said that the root cause of the disease has been cured, so the factors of poor surface treatment of silicone products have the same root cause, and the specific factors still have to be explored from the two aspects of raw materials and molds!
 
Analysis of the causes of dark marks in silica gel products 1: in silica gel raw materials: the raw materials of silica gel products have different formulations and ratios for products with different attributes. therefore, to understand the phenomenon of external defects, the factors of appearance and surface are still based on the difference in the ratio of silica and silicone resin added to the products. since the raw materials belong to semi-transparent white solid glue, during the mixing process, the mixing of the compound and the mixing uniformity of the vulcanizing agent depend on the quality of the compound, and the surface of the product is not good for the raw materials!
 
Analysis of the causes of dark marks in silicone products II: silicone mold: the mold is the core of silicone products, and the material selection on the steel of the mold occupies the main factor. Secondly, the surface defect in the processing process is probably due to the excessive number of pressing times and the deformation of the mold, resulting in the poor appearance of silicone products. Secondly, in the process of finishing the mold, the fine milling of the mold determines the closing line of the product, the self-disassembling edge and the edge wheel angle, etc.
 
Analysis of the causes of dark marks in silica gel products III: molding and vulcanization of silica gel products: during the molding and vulcanization process, the exhaust mode of the product and the trapped air stroke determine the bulging phenomenon of silica gel products. inaccurate time and temperature allocation may lead to the occurrence of dark marks. in addition, the most important thing is the operation method and remark conditions of the machine personnel. in the end, the most important thing in the processing process is random strain, silicone products should be suitable for what kind of parameter configuration and so on.
 
What are the reasons for the dark marks in silicone products?
Why do silicone products appear dark marks? In the production process of silicone products, sometimes the products produced will have different colors and water ripples. This phenomenon is collectively referred to as "dark marks" and is a bad phenomenon. It will have a certain impact on production. Xiao Bian will introduce to you that under those circumstances, dark marks will occur in silicone products.
 
The temperature resistance of 1. color paste is too poor, resulting in water ripples on the surface of silicone products. The color of the glue that produces dark marks during the molding of the product is made up of more than two kinds of color pastes. If the temperature resistance of several kinds of color pastes is too far apart, some color pastes will not change color during high temperature molding, while some color pastes change color due to poor temperature resistance, resulting in water ripples on the surface of the product after molding.
 
2. the molding temperature exceeds the temperature range of the color paste, the color of the surface of the silicone product is inconsistent.
 
3. to the unreasonable discharge method and the mixing of different batches of rubber materials together, the surface color of silicone products is inconsistent. Note: Dark marks belong to poor appearance and are generally unacceptable. Therefore, precautions should be taken according to different situations during production to prevent dark marks. But if there is a mixed color requirements in the design of the silicone decorations.
Silicone products appear dark mark how to do?
 
1. Silicone products have the characteristics of colorless, tasteless and boundless. To change silicone products into colorful colors, it is necessary to add "color masterbatch". Therefore, there must be no mistakes in the selection of color masterbatch. If the temperature resistance of color masterbatch is not good, then basically silicone products become waste products, because color masterbatch should be integrated into silicone products for high temperature molding, at this time, the color masterbatch can be changed by melting at high temperature. If the color masterbatch affects the whole production because of its temperature resistance, the consequence is self-evident, so the most appropriate one must be selected in the selection of the color masterbatch.
 
2. When selecting silica gel raw materials, strict control must be carried out on them. For silica gel raw materials, such as two different silica gel raw materials, it may be difficult to distinguish color difference and hardness with naked eyes, but in fact, there are still differences between the two. If the two batches of silica gel raw materials are mixed and molded, the quality inspection after molding finds a small color difference, and they cannot be shipped, our quality inspection is very strict. Those with chromatic aberration can only be treated in the form of defective products. Therefore, when choosing silica gel raw materials, there must be no mixing. It is very important to know the source. If the head goes wrong, all the following processes can only be soy sauce.
 
3. In the silicone products cutting link should also pay attention to, because if the rubber cutting is too thick or too narrow, then in the cutting of silicone may be more inconvenient exhaust, but also will cause silicone products in the molding surface color difference, privacy in the cutting link, we also want to ensure that the product to cut the best. Other solutions for dark marks in silicone products:
 
1. The mixing of silicone products is uneven when preparing materials, that is to say, the mixing time is too short after the color masterbatch is added, resulting in the color masterbatch not being completely dispersed and averaged, resulting in poor dark marks (ripples) of silicone products during the molding of silicone products. This problem can be solved by refining raw materials.
 
2. The vulcanization temperature is too high. Any kind of silicone color masterbatch has its temperature resistance. When the vulcanization temperature exceeds the upper limit of the color masterbatch, it will cause the color masterbatch to change color at high temperature. If the temperature resistance values of several color masterbatch used in silicone products are different, it may cause a color masterbatch to change color. A color masterbatch does not change color, and naturally it will cause the silicone product to have bad marks (ripple). The mold temperature needs to be adjusted to solve the problem. How much the temperature is reduced is the answer to the problem of continuous reduction until dark marks (ripples) are not caused.
 
3. When the mold temperature is continuously reduced, the dark mark (ripple) of the silicone product is solved, but the vulcanization of the silicone product is incomplete (immature). So basically, the temperature resistance of silicone masterbatch itself is too poor, which usually appears on some color masterbatch with bright colors such as red, green and yellow. The temperature resistance of such color masterbatch will be relatively poor. If it is used to match color matching with other color masterbatch, it is easy to appear dark mark (ripple) defects of silicone products. At this time, it is necessary to consider looking for color masterbatch with close color to color to solve such defects.
 
4. Perhaps you will encounter such a situation in your usual production. A certain color cream will not have dark marks (ripples) on silicone products when it is used before, but it will have dark marks (ripples) when it is used in a certain color palette. This is likely to be this color paste is not compatible with some kind of color paste, resulting in silicone products after forming a dark mark (ripple) bad. No solution is also relatively simple, you can replace the color paste.
 
5, silicone products molding rubber discharge is not fair, which is the most likely to cause silicone products dark mark (ripple) bad factors, because the silicone raw material cutting is too thick and narrow, resulting in rubber heating degree is not even, and then produce silicone products dark mark (ripple) bad. On the contrary, the improvement method is to change the cutting specification of the rubber material to thin and wide so that it can completely cover the key type, which can be effectively solved.
 
6. The storage time of the rubber material of silicone products is too long after it is prepared, resulting in poor mobility of the rubber material, which in turn leads to poor dark marks (ripples) of silicone products. In addition, if too much vulcanizing agent is added when preparing materials, such defects will also be caused.

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