Methods and the matters of making silicone rubber ...

Methods and the matters of making silicone rubber mold Rubber mold is one of the most straightforward way in rapid mold,with silicone material under vacuum pouring, clone the same as the original RP prototype, but life is short, only can be used to produce about 10-30 pieces! but it has a very good flexibility and reproduction performance,with silicone rubber mold,will need not to consider the draft angle, and it does not affect the dimensional accuracy,with a very good segmentation feature, no need to use the under and upper side mold, can be casting integrally .  Room temperature vulcanized silicone rubber is divided in molding type and condensation type. Raw material and formula using special mold silicone rubber, on sale with double packing form, A component is rubber, another is the catalyst. The strength and hardness of room temperature should be under consideration in advance, in order to determine the weight of the AB components mixture ratio. At room temperature 20 to 25 degrees, A: B = 100:1.5. Room low (but not less than 10 degrees) is adapted to increase B 0.1 to 0.3. Room temperature is higher than 25, reduce the group B 0.1 to 0.3. Concrete method is to ascertain the total amount according to mould volume, then A and B component proportional weighing accuracy, put in the vessel stirs well and serves.  Making the mold: mixing the material, poor material onto the original sample.In order to save material to make the thin mold, also can be brushing with separated time.To increase the tensile strength of the mold,can be pasted with gauze. At room temperature under the conditions of 20 degrees can cure with elastomer within 2 hours, can be utilized the next day. Silicone rubber mold making notes: 1, team B is a catalyst is easy to be affected with damp hydrolysis, so after the use,should be laid tightly.2, A, B group once mixed, the chemical reaction; begin immediately, viscosity rise gradually, not suspended, to avoid the waste, according to the dosage, should be used immediately, better not delay.3, A, B group of mixture ratio, in relation to the performance of the chemical reaction speed and mould. B component, the more the faster of the reaction, the higher the strength and hardness of the products, but the toughness decreases.Therefore, accurate weighing requirement.4,before preparation, should mix the material up and down, and weigh again.5, pouring method suitable for relief, besmear brushs method is suitable for stereotype mould production.Casting emboss mould should be done in a class aspect is greater than the original carving aspect every 4-6cm border.To smooth the borders to a right, inside.When pouring place the frame in a clean glass, then put the original box, reserve for 2-3cm per side clearance.(61 yuan/KG) silicone rubber Silicone rubber mold making note: production process to have the bubble solution:  1, the improvement of flash tank and exhaust system design  2, increases the pressure of the press  3, reducing the amount of release agent, and evenly sprayed  4, material controls waters... 5, can try to add some defoaming agent. 6, using the cold runner  7, using vacuum suction machine. Mold can improve the exhaust.