Overview
| brand | Chenxin | model | CX22230 |
| Batch number | CX200 | encapsulation | CX200 |
| packing | Minimum packaging quantity | ||
| material quality | PORON foam | producing area | Kunshan, Suzhou |
| Manufacturer/Place of Origin | Kunshan Jiashunda | density | 20g/cm3 |
| Implement quality standards | 9448A | source | Rubber sponge |
| feature | High rebound sponge | size | Customized by Laitu |
| machining | Die-cutting | colour | black |
| quantity | one hundred thousand | purpose | Special sponge |
Product Details
EPDM Chinese name: EPDM rubber.
EPDM can be divided into: closed cell EPDM and open cell EPDM
Closed cell EPDM is mainly used for foam pipes, extrusion pipes, sealing rings, etc.
Opened EPDM can provide adhesive backing, punching processing, sealing performance, slip resistance, and aging resistance
Our foam products have good thermal insulation and insulation properties; Low permeability; Cushioning and shock resistance; Small bulk density; Sound absorption and soundproofing; Superior temperature resistance; Superior weather resistance; Superior oil resistance, solvent resistance, and drug resistance. Good electrical insulation, chemical resistance, impact elasticity, low thermal conductivity, strong insulation, water resistance, strong shock absorption ability, good elasticity, can be used for high filling coordination, and can withstand heat up to 150 ℃.
With the increase of the third monomer of diene, the following effects will occur: faster vulcanization rate, compression deformation, high elongation, diversity in accelerator selection, reduced anti coking and elongation, and higher polymer
The ethylene propylene ratio can be changed during the vulcanization stage, with commercial ethylene propylene diene polymers ranging from 80/20 to 50/50. When the ratio of ethylene to propylene changes from 50/50 to 80/20, the positive effects include higher compressive strength, higher tensile strength, higher crystallization, lower glass transition temperature, the ability to convert raw material polymers into pellets, and better extrusion characteristics. The negative effects are poor rolling mixing, poor low-temperature characteristics, and poor compression deformation.
When the propylene ratio is higher, the benefits are better processing performance, better low-temperature characteristics, and better compression deformation.
The molecular weight of elastomers is usually represented by Mooney viscosity. In the Mooney viscosity of EPDM, these values are obtained at high temperatures, usually 125 ℃. The main reason for doing so is to eliminate any effects (crystallization) caused by high ethylene content, which will mask the true molecular weight of the polymer. The Mooney viscosity range of EPDM is between 20 and 100. There are also commercial EPDM with higher molecular weight produced, but they are generally filled with oil for mixing.
The molecular weight and distribution in EPDM can be polymerized through the following pathways during the polymerization process:
Types and concentrations of catalysts and co catalysts
The molecular weight distribution of EPDM can be measured by gel permeation chromatography using dichlorobenzene as solvent at high temperature (150 ℃). The molecular weight distribution is usually referred to as the ratio of weight average molecular weight to quantity average molecular weight. According to the normal and highly branched structures, this value varies between 2 and 5. Due to the presence of bonding, EPDM rubber containing DCPD has a wider molecular weight distribution.
By increasing the molecular weight of EPDM, the positive effects include higher tensile and tear strength, higher green strength at high temperatures, and the ability to absorb more oil and fillers. As the molecular weight distribution increases, the positive effects include increased mixing and milling processability. However, a narrower molecular weight distribution can improve the curing rate, curing state, and injection behavior.
Sulfurization type
EPDM can be vulcanized using organic peroxides or sulfur. However, compared to sulfur vulcanization, peroxide crosslinked EPDM has higher temperature resistance, compression deformation, and improved vulcanization properties when used in the wire and cable industry. The disadvantage of peroxide vulcanization lies in its higher
As mentioned earlier, the cross-linking speed and vulcanization time of EPDM vary with the type and content of vulcanization. When mixing EPDM with butyl, natural rubber, and styrene butadiene rubber, the following factors must be considered when selecting a suitable EPDM product:
When mixed with butyl, due to the low unsaturation of butyl, in order to adapt to the vulcanization rate of butyl, a relatively low content of DCPD and ENB content of ethylene propylene diene was selected.
When mixed with natural rubber and styrene butadiene rubber, choose ethylene propylene diene monomer with an ENB content of 8% to 10% to meet its vulcanization rate.
EPDM rubber is a rubber formed by solution copolymerization of ethylene and propylene, followed by the introduction of a third monomer (ENB). EPDM rubber is basically a saturated polymer with excellent aging resistance, weather resistance, electrical insulation, chemical corrosion resistance, and impact elasticity. The main drawback of ethylene propylene rubber is its slow vulcanization rate; It is difficult to use with other unsaturated rubbers and has poor self-adhesion and mutual adhesion, resulting in poor processing performance.
According to the performance characteristics of ethylene-propylene rubber, it is mainly used in several fields that require aging resistance and water resistance electrical insulation, such as for light colored tire sidewalls, heat-resistant transportation belts, cables, wires, anti-corrosion lining, sealing washers, building waterproof sheets, door and window sealing strips, household appliance accessories, plastic modification, etc. The properties and uses of ethylene propylene rubber.
To meet the requirements of special environments, we can also provide customers with foam foam with special functions such as flame retardancy, conductivity, and anti-static properties. We also provide rubber foam split processing and lamination processing.
performance
1: Compressibility can be achieved with minimal force, but the rebound speed after decompression is slower
2: Strong toughness
3: Weather resistant EPDM series sponge can pass ozone resistance test (50pphm * 40. C * 72 hours)
4: Water resistance and water resistance