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Blowing agent
Blowing agent
Chemical blowing agent is a chemical additive that is able to evolve gas through thermal decomposition and produce foam structures in a polymeric matrix such as plastic and rubber and is classified into organic chemical blowing agent and inorganic chemical blowing agent
|
Gas Volume |
Decomposition Temperation |
Appearance |
Type |
|
235±5 ml/g |
200±3˚C |
Yellow powder |
AC1000 |
|
290±10 ml/g |
203±2˚C |
Orange yellow powder |
AC7000 |
|
140±5 ml/g |
135±3˚C |
Light yellow |
ACPW |
|
210±5 |
200±2˚C |
Orange yellow powder |
Blowing agent for LDPE |
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Silicone RTV
RTV: Room Temperature Vulcanizing
This silicone rubber can be cured under room temperature without heating.
It is cured by adding defined amount reinforcing filler, curing agent and catalyst ( or effected by the moisture in the air) to the silicone rubber whose terminal group is hydroxyl ( or acetoxyl).
RTV silicone rubber is divided into one-component and two-component silicone rubber.
Silicone HTV
Silicone HTV
A long chain silicone gum with controlled vinyl level is combined with fumed, precipitated silica as reinforcing filler along with various other materials and additives to create special properties.
Once you cure the compounds at high temperature (100~200 ̊C) after mixing catalysts.
Characteristics
Heat resistance: Usable over 200 ̊C for a long period of time.
Cold resistance: Flexible at ~ -50 ̊C
Good mechanical properties: At high temperature conditions
Good electrical properties: Less affected by temperature change Ozone resistance & Good weatherability
Flame retardant: Low-toxic gas & good flame retardant
Good chemical resistance: Low swelling in acid, base & polar organic compound
Excellent gas permeability: possibility of application to medical devices needing high gas permeability
Water repellent & releasing ability
Silicone LSR
Silicone LSR (Liquid Silicone Rubber)
Liquid Silicone Rubber (LSR) is silicone rubber made from a liquid compound consists mainly of silicone polymer and fumed silica, which are well known for temperature resistant.
Applications
- Heat resistant: Usable over 200 ̊C for a long time
- Cold resistant: Flexible at -50 ̊C ~ -90 ̊C
- Good mechanical properties: At high temperature condition
- Good electrical properties: Less affected by temperature change
- Ozone resistant & Good weatherability
- Flame retardant: Low-toxic gas & good flame retardant
- Good chemical resistant: Low swelling in acid, base & polar organic compound
- Excellent gas permeability: Usable for medical devices by optional gas permed
- Water repellent & releasability
LSR has two components as shown below. Once the components are xixed, it will then to cuer very slowly
.
|
Part B |
Part A |
|
Vinyl polymer |
Vinyl polymer |
|
Filler |
Filler |
|
Inhibitor |
pt.cat |
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Cross-linker |
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