Guangyuan Ruifeng New Materials - How to Add Crosslinking Agents to PVC? What kind of crosslinking agent should be used?

Category: Crosslinking agent

Release Time: 2020-05-25

Summary: Chemical crosslinking method is to add chemical crosslinking agent to soft PVC

Chemical crosslinking method is to add chemical crosslinking agent to soft PVC, and during the plasticization process, the crosslinking agent undergoes crosslinking reaction with PVC. Commonly used crosslinking agents for soft PVC include triazine tris (TCY) and triallyl isothiocyanate (TAIC). The above-mentioned crosslinking agents can be used in combination with organic peroxides such as diisopropylbenzene peroxide (DCP) or polyethylene oxide, as well as magnesium oxide, to prepare chemically crosslinked soft PVC materials. (PVC crosslinking agent)

For example, by adding TAIC 1-5%, DCP 1-3%, as well as appropriate amounts of magnesium oxide, plasticizers, stabilizers, etc. to PVC, the cross-linked PVC material can achieve a tensile strength of up to 23MPa. (PVC crosslinking agent)

TAIC can also be used for crosslinking of PVC/NBR blends. For example, the formula of TAIC crosslinked PVC/NBR foam material is as follows:

PVC 100

NBR 30

DOP 45

TAIC 1

DCP 0.5

AC Moderate

Moderate stabilizer

Adding TAIC and DCP to the PVC/NBR blend system can not only cross link the PVC macromolecules, but also cross link PVC and NBR. Cross linking can significantly improve the foaming performance of the blend. The foam cells are uniform and dense, and the foaming ratio is high, so the foam material has good mechanical properties. (PVC crosslinking agent)

By combining TCY with polyethylene oxide (PEOX) and magnesium oxide, a dynamic crosslinking method can be used to prepare PVC thermoplastic elastomers. The formula is as follows:

PVC 100

DOP 50

Stabilizer 3

TCY 1

PEOX 0.5

Magnesium oxide 2

The mechanical properties of crosslinked soft PVC prepared by dynamic crosslinking method according to the above formula are shown in the following table. (PVC crosslinking agent)

Mechanical properties of cross-linked soft PVC

Test project sample performance

Gel content (%) 53

Tensile strength (Mpa) 18.3

Fracture elongation rate (%) 210

100% Concentration Strength (MPa) 12.6

Permanent deformation (%) 20

Dynamically cross-linked soft PVC has the advantages of small permanent deformation, high strength, and good heat deformation resistance. At the same time, it can also be thermoplastic processed and can partially replace rubber in certain application fields. (PVC crosslinking agent)

Some plasticizers with crosslinkable properties, such as diallyl phthalate (DAP), can also be applied in crosslinked soft PVC. But try to avoid adding acidic fillers as much as possible, and be cautious when adding antioxidants. Other aromatic hydrocarbon oil additives can have a negative impact on the crosslinking effect, so be sure to pay attention to this. (PVC crosslinking agent)

Guangyuan Ruifeng New Materials Co., Ltd. is a professional company that produces PVC crosslinking agents. We have mature production processes and are sure to meet your needs.

Keywords: Guangyuan Ruifeng New Materials - How to Add Crosslinking Agents to PVC? What kind of crosslinking agent should be used?

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