Pre dispersion of rubber additives was proposed in the 1940s, and industrial production began in the 1980s. Large scale industrial production began in the mid-1990s and gradually became known after 2003. At that time, there were only a few foreign-funded factories in China, and it was not until 2008 that domestic factories began to operate and gradually increased.

1、 The characteristics of pre dispersion of rubber additives

Rubber additives are chemicals that bring high added value to rubber products and can reduce costs. However, traditional rubber additives not only generate a large amount of dust and toxic and harmful gases during use, which poses great harm to the environment and the health of operators, but also have poor compatibility with rubber and are difficult to disperse evenly, affecting its effectiveness.

2、 Definition of pre dispersion of rubber additives

Rubber additive pre dispersion, also known as rubber additive mother rubber particles. Pre dispersed rubber additives are based on polymers (usually EPDM, SBR, NBR, EVA) as carriers, with rubber additives and softeners added. Through special processes, traditional rubber additives are pre dispersed into the polymer to obtain a uniform pre dispersion (extrusion granulation) with a certain concentration. Pre dispersed rubber additives are an upgraded version of traditional rubber additives, which have advantages such as dust-free, easy dispersion, suitability for automatic weighing and continuous low-temperature mixing, improved mixing efficiency, and good storage stability. They are increasingly valued in the industry and have been widely used in rubber products.

3、 What are the advantages of pre dispersion of rubber additives?

1. Environmental protection. Avoid dust pollution in the workshop and protect the health of workers.

2. Good dispersion and uniformity.

3. Good compatibility with rubber materials can save mixing time.

4. Easy to weigh, suitable for continuous automation, and convenient for transportation and storage.

5. No loss during the processing, ensuring stable quality between batches.

6. Good development prospects. Pre dispersed rubber additive masterbatch is mainly used in high-quality precision products in China, such as high and medium grade rubber shoes, automotive rubber products, and high-quality rubber pipe fittings. In the field of automotive applications, Chinese tire companies have successively introduced multiple radial tire production lines, and these production lines have begun to use pre dispersed rubber masterbatch products to improve automation. With the increase of tire radial rate in China, there is still a lot of growth space for pre dispersed rubber masterbatch in the future. The deep granulation processing of existing powders and liquid additives is an inevitable trend in the development of rubber additives.

4、 The main components of pre dispersion of rubber additives

1. Rubber additive: It is the main material of pre dispersed rubber additives, and its quality directly affects the quality of pre dispersed rubber additives, usually with a content of 40% -80%.

2. Carrier: The selection of carrier is crucial for the production of pre dispersed rubber additive masterbatch/film, and attention should be paid to the solubility of rubber additives in the carrier and the compatibility between the carrier and rubber.

Requirements for carrier in the formulation of pre dispersed mother rubber particles

The carrier plays a bonding role in the formulation of pre dispersed mother rubber particles, and it is required to have good compatibility with the mixed rubber, with a general dosage of 6-8 parts. The selection of carriers mainly has the following conventional requirements:

1) It should be composed of elastic bodies with saturated bonds. storage stability

2) Should have polarity compatibility. Compatibility

3) Has relatively high thermoplastic properties. Processing performance

4) Should have chemical inertness. Not easily reactive and stable in storage

3. Additives: Additives for pre dispersed rubber additives include plasticizers, lubricants, and anti sticking agents. These additives can improve the dispersion, storage stability, extrusion appearance quality, and prevent adhesion between pre dispersed rubber additives in rubber (carriers).