What about incomplete solidification of liquid silicone rubber products? Six reasons for incomplete solidification of liquid silicone rubber include: too low temperature of liquid silicone rubber mold, too short vulcanization time, pollution of injection pipe (feeding system) or mold, uneven mixing, low temperature of liquid silicone rubber material, and too low temperature of rubber coated substrate skeleton.

Six solutions for incomplete curing of liquid silicone rubber products.

(1) Liquid silicone mold temperature is too low

Reason: the liquid silicone rubber is formed by cl-100ab platinum vulcanization and catalytic curing, and the thermal vulcanization temperature is generally between 110 ℃ ~ 150 ℃. The vulcanization temperature varies with the structure of liquid silicone rubber raw materials and liquid silicone rubber products.

Solution: properly increase the temperature of liquid silicone mold.

(2) Vulcanization time of liquid silicone rubber is too short

Cause: the vulcanization time of liquid silicone rubber is tested at 120 ℃. Between 60s and 300s, the structure of silicone rubber raw materials and liquid silicone rubber products, the thickness of the compound and the curing time have a great impact.

Solution: when the temperature of liquid silicone rubber mold is certain, properly extending the curing time can improve the curing.

(3) Contamination of feeding system such as injection pipe or metal mold

Cause: some oil pollutants will destroy the vulcanization structure of liquid silicone rubber. For example, machine lubricating oil, antirust oil on molds and sweat grease on workers' hands will affect the vulcanization of liquid silicone rubber.

Solution: standardize the operation process of liquid silicone rubber, such as mixing liquid silicone rubber in new plastic barrels, cleaning the injection pipe and the mold before feeding, and requiring workers to wear finger cots or gloves during the whole process.

(4) Uneven mixing of liquid silicone rubber

Reason: the liquid silicone rubber is a/b two-component agent, which should be fully mixed before vulcanization.

Solution: the mixing system has good compatibility with the same brand, and adjusts the speed and pressure of the mixer.

(5) Liquid silicone rubber is too cold

Reason: in order to prolong the service life of liquid silicone rubber when some companies do not produce it for the time being, they often store the mixed rubber at about 5 ℃ and directly add it to production when using it.

Solution: refrigerated liquid silicone rubber is used when the temperature is the same as room temperature.

(6) Low temperature of adhesive coated substrate (plastic or hardware)

Cause: for the liquid silicone rubber coated products, especially the products with thick embedded, the workshop temperature is low (mainly in winter).

Solution: preheat embedded objects such as metal, nylon, plastic, tempered glass, ceramics and wood (bakelite). For porous nylon and bakelite, it is recommended to bake at 90 ℃.