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Do you know the common problems when using silicone prototypes? Next, Xiehe Prototype Processing Manufacturer will give you a brief introduction.

  1. What should I do if there are many bubbles in the silicone of the mold during the mold opening process?

This situation should be handled according to the conditions. If a vacuum machine is available, the silica gel and curing agent must be stirred evenly before vacuuming. If there is no vacuum machine, you can appropriately reduce the amount of curing agent added for processing. For example, the ratio of original silicone to curing agent is 4%, and now it can be changed to 1%-2%. In this way, the initial mold silicone glue connection time will slow down, and the air in the mold will be slowly discharged, reducing bubbles.

  2. What should I do if the silicone mold is cured unevenly after curing?

This phenomenon is caused because 1. The ratio of silica gel to curing agent is inaccurate and the weight is not weighed as required; 2. The silica gel and curing agent are not carefully stirred evenly after mixing. This situation will cause the mold to be scrapped and should be avoided as much as possible.

3． What should I do if silicone sticks to the mold?

This situation occurs first because the mold type (product model) was not properly handled in the early stage. Therefore, the mold type must be processed before opening the mold. If the surface of the mold type is rough or the mold is very complex, you must carefully Sand smooth and clean. Then apply the release agent evenly. Commonly used release agents include petroleum jelly, dish soap, liquid paraffin, etc. In actual operation, different release agents can be applied according to the material of the mold. Second, if the curing agent is not stirred evenly, it will be poured into the mold. When it is removed, one piece will dry and the other will not.

4． What should I do if the silicone mold product is deformed?

This should be handled separately according to the size of the product. In principle, the size of the product is proportional to the hardness of the silica gel used. For small products or very fine products, you can use very soft silicone to open the mold. The hardness is generally 10-20 degrees. This will facilitate demolding and will not damage the texture of the fine product. If it is a large product, such as a product larger than 50 cm, silicone with a hardness of 40-50 must be used to open the mold. This way it won't deform. If you are making a large and very fine product, you can use silica gel with a hardness of about 30 degrees to open the mold (the method is to brush a layer of silica gel, cover it with a layer of fiberglass cloth and then brush a layer of silica gel...). You can use it on the outside. Gypsum and fiberglass (i.e. unsaturated resin + fiberglass cloth) are used as the outer membrane to protect the product from deformation.

5. Production of outer mold

The generally used methods and materials are to surround the mold with plastic boards or wooden boards, and then fill the mold cabinet with gypsum. Another method uses resin painting. Apply a layer of resin and then paste a layer of fiberglass cloth, then paint and paste again. Repeat two or three layers to complete the outer mold of the mold.

6. How to identify true and false silicone oil?

(1) Observe with your eyes: Fake silicone oil will be turbid, have a strong smell, and have a bad smell;

(2) Test with fire: Use a glass rod or iron rod dipped in a small amount of silicone oil and ignite it. What can ignite and emit black smoke is white mineral oil, because white mineral oil is a petrochemical product. Pure silicone oil is incombustible, odorless, clear and non-toxic. The ignition point of silicone oil is 320 degrees, and the ignition point of white mineral oil is 100 degrees.

(3) Freezing point test method: Use 100 grams each of pure silicone oil and white mineral oil, put them in the refrigerator at the same time, and adjust the temperature to -5-10 degrees. After two hours of testing, the fake silicone oil will appear turbid or frozen. Real silicone oil is clear and transparent and will not freeze even at -50 degrees.

7. Slice mold or sheet mold operation method:

The vacuumed silicone is applied by brushing or pouring. If you are making a sheet mold or divided mold and use painting, first apply a layer of release agent or barrier agent on the product or model you want to copy before painting, and then apply silicone on the product ( Note: It must be uniform) After waiting for 30 minutes, stick a layer of gauze or fiberglass weft cloth on the surface to increase the strength, then apply a second layer of silica gel and wait until the silica gel dries before making the outer mold. The outer mold can use gypsum or Resin and other materials.

  8. How to operate the pouring mold or pouring mold:

Filling mold or pouring mold is used for relatively smooth or simple products. There is no mold line to save labor and time. It is to surround the product or model you want to copy with a rubber plate or glass plate, and put the vacuumed silicone Pour directly onto the product. After the silica gel is dry and formed, take out the product and the mold will be formed (Note: Infusion molds generally use softer silica gel to make the mold, which makes it easier to demould and will not damage the product inside the silicone mold) .

The above content is the common problems in the use of silicone prototypes. I hope it can be helpful to everyone. If you want to know more about prototype processing, please call Xiehe Prototype Processing Factory, we will serve you wholeheartedly.