Silicone mold is one of the most simple methods in fast molds. It is usually a complex mold with silicone prototypes, but the life is very short, only about 10-30 pieces! He has good flexibility and replication performance, with silicone rubber Copy molds do not have to consider the draft angle, will not affect the dimensional accuracy, a very good separation, do not have the upper and lower mold can be directly on the overall casting. Mold Making Silicone Rubber And then cut along the predetermined parting line to remove the master mold on it! Room temperature vulcanized silicone rubber is divided into two types of addition and condensation! Raw materials and formulations using a special mold silicone rubber, the series sold in double packaging, A component is a compound, Mold Making Silicone Rubber B component is a catalyst. Preparation to consider the room temperature, mold strength and hardness, in order to determine the proportion of AB component weight preparation. At room temperature at 20-25 degrees, A: B = 100: 1.5. When the chamber is low (but not less than 10 degrees) is appropriate to increase the B component 0.1-0.3 copies. Mold Making Silicone Rubber Room temperature is high to reduce the B group 0.1-0.3 copies. The specific method is based on the mold volume to determine the total amount, and then A, B components in proportion to accurately measure, placed in the vessel evenly stirred, Serve. Molded: the deployment of good materials, into the imitation of the clean kind can be. In order to save material, made thin mold, can also be divided brush. To increase the tension of the mold can be glued gauze and the like. In room temperature 20 degrees under 2 hours can be cured into elastomer, one day after use. Silicone mold production Note: 1, B component is a catalyst, easy to tide hydrolysis, it should cover the lid after use. 2, A, B group by mixing, chemical reaction; immediately began, the viscosity gradually increased, can not be suspended, in order to avoid waste, should be based on the amount, with the use with, with good immediately after use, can not be delayed. 3, A, B group of the ratio, Mold Making Silicone Rubber related to the speed of chemical reactions and mold performance. The more B components, the faster the reaction, the higher the strength and hardness of the product, but the toughness decreases. Therefore, the weighing requirements are accurate. 4, before preparation, should be a group of ingredients up and down mixing evenly, and then weighing. 5, pouring method suitable for relief type, brushing method for three-dimensional mold production. Casting relief type of mold should be made longer than the original width of the original carving long and wide 4-6CM border. Border to be flat, the inside to be smooth. Pour the border will be placed in a clean glass plate, and then the original on the box, leaving 2-3CM each side of the gap. (Silicone rubber 61 yuan / KG) silicone mold production Note: the production process bubble solution: 1, to improve the design of the flash slot and exhaust system 2, increase the pressure of the press 3, reduce the amount of release agent , And even spray 4, the material control the water ....... 5, you can try to add some defoamer 6, the use of cold runner .7, vacuum with a vacuum machine, the mold can increase the exhaust Gymnastics.
When we use the silicone mold, in order to save costs and improve work efficiency, of course, hope that the mold can be more mold times, long service life. Mold Making Silicone Rubber How can we make the production of silicone molds to increase the life of it to ensure that the use of silicone mold more durable! Xiaobian following you to see the following several ways to see it!
First, the use of perfusion method of making silicone mold, according to the fine pattern to select the appropriate hardness of the silicone.
Under normal circumstances:
Silicone hardness of 10-30 Shore degrees, the higher the hardness, the quality is relatively better;
Silicone hardness of more than 30 Shore degrees, the higher the hardness, the quality is relatively poor.
1. simple pattern of the product, anyway, easier to mold release, it is recommended to choose a little harder;
2. Fine pattern of products, due to fear of damage to the product, the actual situation will generally choose a little smaller hardness because the more soft the better mold release, but at the same time, the quality will be relatively poor.
However, we can still choose a relatively large hardness of the silicone, as long as the mold on the silicone mold can be opened on the line, one to facilitate the stripping, Mold Making Silicone Rubber and secondly will not pull more than the mold caused by more quickly die, Eventually played a role in extending the life of the silica gel.
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Second, according to the model product size selection irrigation or brush mode.
If this product size is large, it is necessary to use the brush mode, although the province of provincial and provincial effort, but it is burned Oh ~
Because the large pieces of products using irrigation mold, a waste of silica gel to increase the cost of two too heavy products will be easy to crush the silicone mold deformation or rupture, but you choose to brush the mold, then you can add a few layers of gauze inside to enhance the mold The toughness and strength, coupled with the support of the outer mold is not easy to be crushed or pressure deformation.
Third, according to the size of the product to choose the appropriate hardness of silica gel.
1. Small pieces of products, generally more soft silica gel more appropriate. Because the silicone when the mold will be very brittle, it is easy to break the small parts of the product, which will cause the mold is not durable Oh.
2. Large products, such as stone cement products so hard so heavy, Mold Making Silicone Rubber if the choice of soft mold silicone material, mold is it easier to be crushed? Because the silicone is too soft, its tensile strength and tear strength will be reduced, made out of the mold will be deformed, the life will naturally be reduced.
Fourth, silica gel and curing agent to stir evenly.
Otherwise there will be dry dry, or curing the uneven situation, there will be such a situation caused by the retirement of the mold, to try to avoid.
Fifth, the vacuum bubble is also able to extend the life of the mold.
You think, a mold inside full of holes, full of bubbles, you dare to say that this mold has a good tear strength?
Sixth, resin products to be stripped as soon as possible, so as not to die burned
Because the unsaturated resin and resin products added peroxide curing agent, the resin reaction will produce a lot of heat, the general resin curing time of 3 minutes, so 3 minutes after the release as soon as possible to prevent the silicone mold will not Produce the phenomenon of burning mold.
Seventh, when the purchase of silicone quality check in place Oh
Some silicone manufacturers to reduce costs, the process of making silica gel added silicone oil (silicone oil and white mineral oil complex), will lead to make out of the silicone mold powder serious oil, which will seriously affect the silicone mold The quality and service life.
Eighth, in the process of making the mold, it is recommended not to add any silicone oil in the silicone
Due to product changes, many people sometimes take the initiative to add silicone oil to silicone to reduce the hardness of silica gel or dilute the viscosity of silica gel purposes, here Xiaobian suggested not to add any silicone oil silicone Oh. Because the greater the amount of silicone oil added, made out of the mold will become soft, tension and tear strength will be reduced, the silicone will naturally be difficult, the service life will be reduced. If necessary, silicone oil is best not to add more than 5% -10%.
If the new project is coming, the batch of goods did not run out of the proposal can wait until the future of a similar project when the re-use, this time to order the appropriate hardness and viscosity of the silica gel can be, because the leaves of silica gel shelf life can be a year Oh.