What is BIPB?

December 22, 2022 Longchang Chemical

What is BIPB?

The vulcanizing agent BIBP belongs to the peroxide class cross-linking agent, in the vulcanization process for free radical cross-linking, high cross-linking density of rubber products, cross-linking process does not emit irritating odor to the environment without pollution. Suitable for vulcanization methods are: molded vulcanization, steam tank vulcanization, high temperature continuous vulcanization.

Vulcanizing agent BIBP
BIPB is called odorless DCP, in addition to the similarity in structure, there is an important reason, that is, almost can use DCP where it can be replaced by BIPB, BIPB instead of DCP rubber performance, including hardness, breaking strength, elongation, tear strength and oil resistance, aging coefficient, etc., basically the same, and compression deformation at high temperatures, BIPB is better than DCP.

But BIPB has a significant disadvantage, that is, the price is too much higher than DCP, which is the biggest factor limiting the widespread use of BIPB. The use of BIPB in Europe is much higher than DCP, and with the strengthening of domestic producers and consumers’ awareness of environmental protection, the demand for domestic BIPB is now increasing.

Another big disadvantage of BIPB is that when using BIPB as EPDM cross-linking agent, it is easy to appear the phenomenon of spraying crystal (note that it is spraying crystal, not spraying frost), the light will go up bright crystal, while DCP will not. This is due to the decomposition products of BIPB and EPDM poor compatibility and spray out. If your products are exported to foreign countries, especially in Europe, you can rest assured that customers will know that you use a good vulcanizing agent and gladly accept. If you want to solve this spray crystal phenomenon, there are two main methods.

1. adding PEG4000 to the formulation.

2. reduce the amount of BIPB at the same time to add part of the double two five, equivalent to reduce the decomposition products of BIPB, without affecting the cross-linking efficiency.

These two programs are successful examples, of course, there are also manufacturers of EPDM with BIPB cross-linking agent does not appear spray crystal phenomenon, perhaps because of a number of additives to limit the crystal spray, the specific why is not known.

Thermoplastic rubber TPV also has the use of BIPB as a cross-linking agent, but with the automotive industry’s increasingly high odor requirements, that is, after the use of BIPB, odor is not necessarily to meet the requirements, but also need further processing, such as the use of chemical / physical adsorption, de volatile, drying and other process means to reduce odor.

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