Brief description of domestic and foreign rubber processing aids profile
There are also many professional suppliers and service providers of processing aids introducing processing aids to our Chinese tire factories and rubber plants, among which the famous ones are
2. Classification of processing aids:
1 Dispersant .
Function: To improve the dispersion of carbon black and other powders in the rubber, prevent sticky rolls, reduce scorching and shorten processing time. It also has the effect of improving the fluidity of the rubber and plasticizing.
Composition: Polymerization product of high molecular fatty acid esters or mixture with metal soaps.
Typical foreign products: Kettlis FL (Germany), S.S WB212 (Germany), StruktolA60 (USA), GumEase T-78 (USA), GumFruit T-52 (USA), etc.
2.2 Homogenizing agent
Function: To solve the blending of polar and viscous polymers. It is widely used in the formulation of raw rubber with different polarity and butyl liner.
Composition: A mixture of low molecular resins with different polarities. Manufacturers generally do not disclose the exact composition and ratio of their products. The production process is generally through the raw materials or intermediates hot polymerization and obtained; can also be several resins according to the percentage of physical methods mixed into one. Or by granulation.
Typical foreign products: 40MS, 60NS, HP55, THl0A from S.S. Germany and Struktol 40MSF, 60MSF from USA, H501, HS01B, etc. from DOG Germany.
Typical domestic commodities:
According to preliminary statistics, in 2006, only the tire industry demand for homogeneous agents reached about 4,000 tons, according to the product sales price in China, at least 1.4 billion yuan of market prospects.
2.3 Plasticizer
Role: Processing aids to improve the softness or tensile properties of polymers during plasticizing. According to its mechanism of action can be divided into two categories of physical plasticizers and chemical plasticizers. It is customary to call chemical plasticizers plasticizing agents.
2.31 Physical plasticizer: its addition can reduce the viscosity of the compounding rubber, increase the plasticity of the rubber, and can improve the dispersion of carbon black and other compounding agents to improve the physical properties of vulcanized rubber. Chemical plasticizer is added during the plasticizing of raw rubber, which not only improves the plasticizing effect, shortens the plasticizing time and saves energy, but also has a small amount and strong plasticizing power.
Composition: unsaturated or saturated fatty acid, fatty acid ester or its zinc soap is the most widely used physical plasticizer.
Typical foreign commodities: the United States Struktol A60 / A61
2.3.2 Chemical plasticizer: also known as plasticizer.
Composition: It is added to enhance the plasticizing effect of raw rubber through chemical action, and greatly shorten the plasticizing time, so as to save energy and improve the mechanical efficiency. According to the structure, it can be divided into
a. Pentachlorothiophenol type products
Typical foreign products: Renasit of Bayer Chemical Company, Germany 7.
Ltd. SJ-103, Xijiang Huangyan Donghai Chemical Factory AP.
b. Aryl disulfides
Typical foreign products: Renasit 11 from Lanxess Chemical Company, Germany
Typical domestic products: DBD, P40 and A86 of Haicheng Chemical Auxiliary Factory, etc.
C . Organometallic complexes
Typical domestic products: compound plasticizer HTA produced by Shandong Yanggu Huatai Chemical Co.
Among the above three types of products, pentachlorothiophenol has been banned in Europe because of its toxicity, but it is still used in large quantities in China because of its cheap price; aryl disulfide is a famous plasticizer abroad, it is non-toxic and has good plasticizing effect, and Haicheng City Chemical Auxiliary Factory is the leader of this product in China, but because of its expensive price, it is not produced in large quantities in China; organometallic complex is also non-toxic and has good plasticizing effect. Because of the same price problem, is currently under development.
2.4 tackifying resin:
Function: It is to improve the self-adhesive properties of rubber and tire molding stickiness.
Composition: a variety of resins; traditional varieties of petroleum hydrocarbon resin, gumarone indene resin, rosin resin and terpene resin, etc., with the expansion of the use of synthetic rubber, all-steel radial tires and the development of semi-all-steel radial tires, to the popularity of vulcanized tires, the need and has been out of the new varieties of tackifying resin.
Typical foreign products: Koresin of German BASF company, which is a condensation of tert-butyl phenol and acetylene, Koretack thermoplastic octylphenol formaldehyde resin benzene series (i.e. SP 1068 resin).
Typical domestic products: According to the notice of Sinopec Xieke Office [2002] No. 005: Shanghai Sanshi Auxiliary Products Co. It has been well received in the past formulations with Koresin resin, such as tire production and curing retreading. It has been recognized and concerned by many people including those who have used Koresin resin. Domestic widely used non-thermal reactive phenolic resin: 203 resin (i.e. SP1068), para-octylphenol formaldehyde resin. Its manufacturers are
2.4.1 Application status of tackifying resin
As the production of radial tires must use viscosity-enhancing phenolic resin, imported Koresin resin is expensive, and the supply is insufficient, so a large part has been replaced by KR-8, 204 resin, 203 resin; KR-8 price is only half of the imported similar products, the effect can be said to be the same, usually can be replaced in equal amounts, 204 resin is called “instead of Koresin”, can be added to replace the amount, to achieve the same effect, but can solve the resources and reduce costs.
