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Precautions for mixing butyl rubber

2024-03-04

Butyl rubber synthesized from isobutylene and a small amount of isoprene has excellent air tightness and water tightness, good chemical stability and thermal stability, and is widely used in the preparation of various inner tubes, steam pipes, water tires, dam bottom layers, gaskets, etc. product. When using butyl rubber to produce rubber products, due to the high cold flow of butyl rubber, the semi-finished products have relatively poor stiffness and are easily deformed, the compounding agent is not easy to disperse during rubber mixing, and the rollability is poor; therefore, it is necessary to strictly control the mixing. refining process. 1. Pay attention to the cleanliness of the equipment before mixing When butyl rubber is mixed, other rubbers or impurities, especially rubber with high degree of unsaturation, are mixed into the mixing equipment, which directly affects the quality of the rubber compound. In severe cases, the finished butyl rubber products will be directly scrapped. Therefore, the mixing equipment must be cleaned before mixing of butyl rubber, and the mixing equipment should be checked and maintained regularly during normal use. 2. Pay attention to the mixing process conditions when mixing Butyl rubber has low self-cohesion and poor self-adhesion. The rubber compound is easy to break up, and the process of re-agglomeration into the whole is very slow. Therefore, higher mixing temperature and longer mixing time are required during mixing. During the mixing process, 2YLYY114-MXF pays attention to the change of mixing temperature in time, strictly controls the mixing temperature, and avoids that the temperature is too high or too low to affect the quality of the mixed rubber and the quality of the finished product. When the butyl rubber is mixed with an internal mixer, the mixing temperature is generally controlled at 150 ° C to promote the uniform dispersion of the compounding agent. 3. Points to note when mixing different rubber mixers (1) Kneading with an open mill: When using an open mill to knead butyl rubber, the feeding method (that is, adding rubber and compounding agents after the rubber roll is introduced) is used to overcome the problem of poor butyl roll performance. The feeding process The slow feeding is carried out in batches. First, half of the raw rubber in the formula is repeatedly thinned with a small roll gap, and the other half of the raw rubber is added after waiting for the roll to improve the mixing effect. When mixing, the temperature of the front and rear rolls should be properly controlled, and the temperature of the front roll should be 15-20°C lower than that of the rear roll, so as to adapt to its cooling roll performance. (2) Mixing with an internal mixer: When using an internal mixer to mix butyl rubber, appropriately increase the loading capacity, and the capacity is greater than 10%-20% of the natural rubber; the pressure of the upper jack is higher than the pressure of the lower jack during mixing . When the amount of compounding agent used in the formulation of butyl rubber products is large, the two-stage mixing method or the reverse mixing method can be used for the mixing process.

China's butyl rubber imports hit a record high in 2020

2022-06-17

In 2020, China's butyl rubber imports reached a record high of 284,000 tons, of which ordinary butyl rubber imports were 116,500 tons, a year-on-year increase of 38.36%, and halogenated butyl rubber imports were 167,500 tons, a year-on-year increase of 2.20%.

Rubber filter process of butyl inner tube

2022-06-17

Latex reclaimed rubber and butyl reclaimed rubber in reclaimed rubber are ideal raw materials for producing inner tubes, especially butyl reclaimed rubber that can replace butyl rubber to produce butyl inner tubes; Proportion of butyl reclaimed rubber, butyl rubber/reclaimed rubber combined use When producing inner tubes, not only need to pay attention to the proportion of reclaimed rubber blending, formula design, mixing process, but also a particularly important process - filter rubber. Butyl inner tube is a typical thin-walled rubber product, and the cleanliness of the compound is particularly high. Once the butyl compound contains impurities, it will not only affect the appearance of the butyl inner tube, but also seriously affect the air tightness of the butyl inner tube. Therefore, the rubber filter is a necessary process in the processing of butyl inner tube. The rubber filter process is the process of filtering the rubber material through the screen to remove impurities. It is carried out in a rubber filter machine. The mechanical impurities inside the reclaimed rubber are filtered out. In the operation of butyl rubber/reclaimed rubber, the following issues need to be paid attention to: 1. The butyl inner tube compound needs to be preheated before filtering. The temperature of different parts of the rubber filter machine is different during preheating, which needs to be determined by the inner tube processing enterprise according to the actual needs. 2. In order to avoid the early vulcanization of the rubber during the filtration of butyl rubber/reclaimed rubber, compounding agents such as sulfur and accelerators are added after the rubber is filtered; the heat generated when the rubber is filtered is large, and measures must be taken to strengthen the rubber filter. After cooling, the rubber compound after filtration can be cooled down by tablet pressing with an open mill and fully cooled.

The three main applications of butyl rubber

2022-06-17

Butyl rubber (abbreviated as IIR) is a synthetic rubber produced by cationic polymerization of isobutylene and isoprene under the action of Friedel-Craft catalyst. It has excellent air tightness and good heat resistance, aging resistance, ozone resistance, Solvent resistance, electrical insulation, shock absorption and low water absorption properties make it inner tubes, vulcanized bladders, air liner, sidewalls, wires and cables, waterproof building materials, shock absorption materials, medicinal bottle stoppers, food (chewing gum base) , rubber dams, anti-gas appliances, adhesives, inner tubes, door cores, anti-corrosion products, dock ship fenders, bridge support pads and heat-resistant conveyor belts have a wide range of applications. Three major applications of butyl rubber 1. Tires The largest application of butyl rubber is in the manufacture of tire innerliners and tire inner tubes. The halogenated butyl rubber used in the tire industry is used as the inner liner for automobile, truck, public vehicle and aircraft tires, and its use accounts for 84.6% of the total consumption of butyl rubber in my country. The inner liner of radial tires is generally composed of halogenated butyl rubber. Each heavy duty tire uses about 1.2kg of halogenated butyl rubber, each light truck tire is 0.35kg, and each car tire is 0.3kg. At the same time, the all-steel truck radial tire is equipped with 50% butyl inner tube, and the heavy-duty bias tire is equipped with 20% butyl inner tube. On average, each inner tube needs about 2.3kg of ordinary butyl rubber. 2. Medicinal rubber stopper Butylation of medical stoppers is the second largest demand market for butyl rubber in China. In order to ensure the safety of medication, the national pharmaceutical authority issued the document Guoyao Guanzhu [2000] No. 462, which stipulated that after the end of 2004, all domestic medicinal rubber stoppers (including powder injections, infusions, oral liquids and other dosage forms) should stop using ordinary natural rubber stoppers. Rubber stopper. At present, butyl rubber used in medicinal rubber stoppers in my country accounts for 10.5% of the total consumption. The following introduces several main medicinal rubber stoppers. 3. Others The remaining 4.9% of butyl rubber is mainly consumed in chewing gum base, waterproof membrane, adhesive, rubber dam, etc. The use of this material is introduced below. Chewing gum base is a non-nutritive, non-digestible and water-insoluble chewable solid. It is the most basic chewing substance in chewing gum and bubble gum, and some chewing gum product formulations contain a base made of 20%-30% butyl rubber. Butyl waterproof tape is a life-long non-curing self-adhesive waterproof sealing tape made of butyl rubber as the main raw material and other additives through advanced technology processing. It has strong adhesion to various material surfaces. At the same time, it has excellent weather resistance, aging resistance and water resistance, and plays the role of sealing, shock absorption and protection on the surface of the adherend. The product is completely solvent-free, so it does not shrink or emit toxic fumes. Because it does not cure for life, it is an extremely advanced waterproof sealing material. The production method of butyl rubber adhesive is as follows: first, butyl rubber is plasticized, then mixed with other solid additives, sliced, and then dissolved in solvent gasoline, and at the same time, 91% isopropyl alcohol is added, and it is dissolved and stirred evenly. . Generally used as solvent pressure sensitive adhesive and sealant. Rubber dam, also known as rubber sluice, is made of high-strength synthetic fiber fabric as the stress skeleton, coated with butyl rubber inside and outside as a protective layer, processed into tape, and then anchored on the bottom to form a closed dam bag. The drainage pipe is inflated with water (gas) to form a bag-type retaining dam. The crest of the dam can overflow, and the dam height can be adjusted according to needs, and the upstream water level can be controlled to play the role of irrigation, power generation, shipping, flood control, and tide blocking.

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