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How to reduce the viscosity of silica gel products appear impurities

Release time:

2020-11-09 16:56

Source:

Silicone rubber tube is added to a two-roll rubber mill or a closed kneader, and gradually added white carbon black and other additives to make it uniform repeatedly. According to the technical standard requirements of industry products, the products made by extrusion, the products made by extrusion of silicone products will stick together after being put together for a long time. The silicone tube extruded by peroxide vulcanization will still stick together after being stored for a long time after being vulcanized in the second stage, what is the cause of this, so how to reduce the silicone tube to avoid viscosity, silicone keys.

1, silicone tube extrusion after the two vulcanization before adding isolation agent.

2, silicone tube surface sandblasting should be related to the extrusion mouth.

3. The main reason is the ratio of silane coupling agent, hydroxyl silicone oil, stearic acid sealing ring zinc and vulcanizing agent in mixing silica gel. It is necessary to specifically design the ratio of mixing silica gel material and mixing process.

4. If the viscosity of silica gel is too high, you can adjust the formula in the next production and add more base material 107 and silicone oil to the liquid silica gel. Or add less meteorological silicon without changing the base material and silicone oil. The specific situation is determined according to the required properties of the adhesive. At the same time in the future production pay attention to the yield value of calcium powder, sometimes the moisture content of silicone products factory is too high will also affect the viscosity.

Silicone rubber tube is added to a double-roll rubber mill or a closed kneader, and gradually added with white carbon black and other additives for repeated refining and uniformity. According to the requirements of industry product technical standards, silicone rubber key manufacturers are made through extrusion, which can be used for conductive silicone rubber in the electronic industry. The production of silicone rubber tube is very strict when selecting raw materials, because the raw materials will affect the product quality of silicone tube, for the use of some precision is not a trace of error, the seal then the use of silicone tube in the process of impurities is what reason.

A silicone tube has an impurity problem. The product before the second stage is perfect. After the second stage, about 10% impurities appear. It looks like a small protrusion on the outside. You can't see anything when you cut the meat and rubber products. Under the microscope, you can see some yellowish brown particles, which can be crushed. White materials have been dried without impurities. Anti-aging agents have not been tried. There are all of them. It is useless to change several batches of materials, I'm going to check the coupling agent. There are impurities only after the second rubber key section. What is the reason.

The second stage has high temperature and long time, and some raw materials in it are not completely dispersed. The auxiliary agent is dried and cooled with the furnace. After dosing, the auxiliary agent is thinly passed and triangulated. After mixing, the auxiliary agent is parked for not less than 12 hours. Before using, the auxiliary agent is thinly passed and retreated.

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