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What should be paid attention to in the dripping process of silicone products

Release time:

2019-05-18 12:30

Source:

Silicone ProductsWhat should be paid attention to in the process of dropping glue?
 
The benefits brought by the glue dripping process to the silicone products of Dongguan Silicone Products Factory are not only to protect the surface of the product from abrasion, but also to pursue high quality and exquisite appearance. It is not difficult to make a piece of product into a transparent appearance effect. Do the following points well.
 
1. Ensure the cleanliness of all appliances during the glue dripping process, so as not to affect the surface of the glue after curing impurities, ripples, pitting and other defects.
 
2. The proportion of glue must be weighed accurately, and the glue must be stirred evenly, otherwise it will lead to incomplete curing of dripping glue and curing for a long time.
 
3. The humidity of the glue dropping working environment is controlled within 68%. It is not recommended to drop glue on rainy days, because when the air humidity is too high, the mist in the air will directly cause the glue surface to oxidize. It is recommended to use air dehumidifier when the production task is tight.
 
4. Silicone products with strict glue dropping effect should be placed in the dry area, and the temperature should be controlled between 28 ° - 40 °. First of all, we first come to know what is the crystal drop glue:
 
One. Crystal drops of the latest identification method of three moves to distinguish good and bad crystal drops of glue! Some customers often ask, if the quality of the glue is not good, how can we objectively judge the good quality and bad of the glue from the naked eye? Now, let's talk about several better judgment methods on this issue! Take epoxy AB glue as an example! (Jelly gum, PU gum, etc. are not within this scope).
 
1. Separate the glue dropping sign from the substrate (the method is to cut the glue dropping sign from the middle of the glue dropping sign with a blade and bend the label). Enlarge the transparent part of the glue dropping sign on the fingernail and watch it with naked eyes. If the glue turns yellow after curing, it indicates that the glue is not good (it can be said to be garbage glue). Transparency is preferred, and the above methods are generally not distinguishable until 2 months after the label is made.
 
2. After making the glue drop label, immediately put it outdoors. Generally, the crystal glue drop is kept on the surface (not attached to the object) for 5 months without warping and discoloration. If it is bad glue, it will change color and become warped seriously after 2-3 days. The regular shape is like a pot, with the middle surface bottom high!
 
3. Before making the goods, please make samples and test them. By the way, ask the manufacturer to send some samples. With the above two methods, you will generally know whether the crystal drop glue given to you by the manufacturer is good or bad.
 
II. LED drop glue basic data LED patch curing can be applied to PCB using syringe drop glue method, needle transfer method or template printing method.
The use of needle transfer method is less than 10% of all applications. It uses needle arrays immersed in a tray of glue. The suspended drops of glue are then transferred as a whole to the plate. These systems require a relatively low viscosity glue and good resistance to moisture absorption because it is exposed to the indoor environment.
 
Key factors in controlling needle transfer dripping include the diameter and style of the needle, the temperature of the glue, the depth of the needle immersion, and the length of the dripping cycle (including the delay time before and during the needle contacts the PCB). The tank temperature should be between 25~30°C, which controls the viscosity of the glue and the number and form of the glue points. Template printing is widely used for solder paste and is also available with dispensing glue. Although less than 2% of SMAs are currently printed with templates, interest in this approach has increased and new devices are overcoming some of the earlier limitations. Correct template parameters are the key to achieving good results.
 
Below, the small series for everyone to briefly introduce, crystal glue related applications of crystal glue main applications are:
1. Production of mobile phone protective film.
 
2. Production of new crystal photos, shell paintings, hotel crystal murals, sand paintings, etc.
 
3, crystal bus card crystal crafts, bank cards, crystal water, as well as some crystal bottle caps, crystal combs and other objects
 
4. Spraying process of cloth, etc. In the actual process of using the stock, the treated fabric is more wear-resistant and high temperature resistant.
 
5. Preparation of electronic components, surface encapsulation of solar cells, and surface coating of some handicrafts such as chapters and buttons.
 
6, magnetic buckle, badge, key chain, and the application of crystal glue between the signs
 
Four. Crystal drop glue products special crystal drop glue are input materials produced by special process, compared with ordinary crystal glue has the following advantages:
1. The surface effect is not water ripple
2. hardness is particularly strong, can reach 85-100SHORED crystal glue
3. The appearance is colorless and transparent, after curing, the transparency is high and the gloss is very good drop glue jewelry
4. All of Grace's products are tested by SGS. Such as ROHS,REACH,MSDS and so on
5. product automatic defoaming, automatic leveling, simple operation
6. products almost without any pungent smell, operation more humane crystal drops
 
Five. Crystal drop glue album material description and production method [product characteristics]]
1, this product is a hard epoxy resin crystal glue, low viscosity, good leveling, good defoaming performance, yellowing resistance
2, can be cured at room temperature or medium temperature, curing speed is faster, is the best benefit, the highest quality photo album glue
3. Good transparency, high hardness, smooth surface, bright, no ripple, strong adhesion
4. The cured product has good solvent resistance, wound resistance and yellowing resistance.
 
application field]
1, special photo album crystal glue is ideal as well as handicrafts and other products of the surface coating and glue drop;
2. The surface of other products such as marble, handicrafts, ceramics, hardware, plastics, electronics, wood and other products is dripping glue.
3. Surface encapsulation of other hard products;
4. It is not suitable for surface dripping of elastic or soft products. [operating conditions] ratio: A:B = 2:1 (weight ratio) usable time: 25°C X 50 minutes (100g mixing amount) curing conditions: normal temperature 12H dry, heating 45°C x 4H constant temperature 45 degrees before putting into oven crystal glue drop key!! Crystal drop glue drops to any shape of the object, as long as the liquid surface submerged the object, the final solidified surface shape must be:
1. The edge is curved, and the size of the arc is related to the viscosity of the crystal glue.
2. The upper plane must be horizontal.
3, in order to obtain the upper surface of the arc, with natural flow of curing, it is impossible to achieve.
4. There are three methods: the first is to use multiple drips, and then the next time after the last curing, and the area of each time is gradually reduced. In this way, a stepped arc will be obtained. First, it is very labor-intensive. Second, the adhesive layer will be too thick and not very beautiful.
 
The second type is to do it on another plane first, then press it firmly with a mold with the same radian as the working plane when it is not too hard, uncover the mold after curing, and then paste it on the working surface.
 
The third kind: with soft crystal drop glue, after making paste to the work surface.
 
The fourth kind: first pour crystal drop glue into an arc-shaped mold, after the first half-dry, turn the working body upside down, fill the glue in the mold and wait for curing, then demould. If the batch is large and there is long-term work, you may as well make some such molds to meet the requirements of the arc surface. In a word, this kind of process design that makes the adhesive surface curved is unreasonable in itself. Unless there is a very special and extremely high price order, it will not take the job.
 
Therefore, I hope the manufacturer can do: firstly, ask the customer whether the design is wrong or not. Secondly, check yourself to see if you mistake the things that are curved around and horizontal in the middle for the arc in the middle. Precautions
 
1. Instruments such as balance scale (or electronic scale), oven, worktable or operating object carrier must be placed horizontally, otherwise it will affect the accuracy of weighing or cause glue overflow of the operating object just dripped with glue.
 
2. When weighing glue with a balance scale or electronic scale, be sure to remove the weight of the container to avoid inaccurate weighing..
 
3. The containers used must be dry, clean and dust-free, otherwise it will affect the surface effect of the glue after curing, resulting in undesirable phenomena such as ripples, water lines and pockmarks.
 
4, the glue must be weighed accurately according to the weight ratio, the proportion of the imbalance will make the glue dry for a long time or the hard glue becomes soft.
 
5. The glue must be stirred evenly, otherwise the surface of the glue will appear after curing, that is, resin lines, or the glue will not cure completely.
 
6, the operation site and working environment must be air circulation, and be sure to make no dust, debris, otherwise it will affect the transparency of the colloid or make the surface of the glue cured spots, the effect.
 
7. The relative humidity of the air in the working environment is recommended to be controlled within 68%, and the site temperature should be 23-25 ℃. If the moisture in the working environment is too heavy, the glue surface will be oxidized into mist or bubbles will be difficult to eliminate. The temperature is too low or too high will affect the glue curing and use time.
 
8. The work dripped with glue should be dried in the concentrated area, and the temperature should be controlled at about 28 ℃-40 ℃.
 
9. If the delivery period is tight, heating and curing can be adopted, but heating can only be carried out after drying for more than 90 minutes in the concentrated drying area. The heating temperature should be controlled within 65 ℃, and the specific drying time should be determined according to the glue itself.
 
10. The glue barrel should be covered immediately after the glue is poured out to avoid long-term contact with air and cause oxidation and crystallization of the glue.

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Inventory of the advantages and advantages of silicone products

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