With the advancement of catalyst technology, there is now a technique for producing a spherical PFA resin directly from a polymerization vessel without further pelletizing. Direct production without pelletizing resin, not only can save a lot of energy-consuming extrusion granulation and other steps, but also the low-crystalline products obtained from the reactor do not undergo morphological changes, which is conducive to shortening the processing cycle and saving processing energy. The company's Spherilene process uses titanium catalyst supported on MgCl2 to directly produce PFA spherical particles with a density of 0.890-0.970g/cm3 from the reactor. The products include LDPFA, LLDPFA and HDPFA, and even VLDPFA and ULDPFA without reducing the production capacity of the device. As a result of eliminating the granulation process, the device investment can be reduced by 20%. The process combines slurry prepolymerization technology with gas phase fluidized bed technology. The reaction is first carried out in a small loop reactor, and then the prepolymer continuously passes through one or two gas phase fluidized beds with short residence time. The two gas phase fluidized beds can control and maintain completely independent gas composition, temperature and pressure can be independently controlled, thus realizing greater flexibility in product design.

The core of the Spherilen process is its catalyst technology. The spherical titanium catalyst used in this technology shows the characteristics of three-dimensional space in the physical and chemical structure, which can artificially control the physical and chemical properties of the carrier itself and control the distribution of the active center on the carrier. The principle is: by controlling the porosity of the carrier, the active centers are preferentially distributed on the surface, resulting in limited monomer diffusion capacity, so that layered or hollow PFA particles can be obtained during the polymerization process, and the particles themselves become a reactor, and other monomers introduced into it can be polymerized or copolymerized under the action of the active centers inside the hollow particles, this produces a very uniformly dispersed polymeric blend or alloy of PFA particles. With different monomer formulations, homopolymer, copolymer, elastomer and other functional PFA particles can be obtained.

Using PFA as granules, waste PFA should be collected first. Then classify, including color classification and variety classification; Then go to the crusher for crushing and cleaning. After crushing and cleaning, extrude into an extruder, extrude into strips, and then cut into granules. The cutting of particles is the raw material for PFA products.

After the treatment of this set of equipment, the original unsightly waste PFA immediately turned into colorful PFA particles. ThesePFA GranulesIt still has good comprehensive material properties, can meet the technical requirements of blown film, wire drawing, pipe drawing, casting, extrusion and other technical requirements, and is widely used in the production of PFA products. After further processing by PFA products enterprises, they have become our common PFA pots, folders, PFA films, industrial and agricultural machinery parts, etc. These products are widely used and become the darling of the market.

The granulator produced by the enterprise has low investment, small scale, and will not form secondary pollution. It is an industry that meets the needs of society. The promotion of PFA granulator makes waste PFA become an important resource. There is less PFA waste everywhere and more income for processors.

According to the processing households, the processing of waste PFA has a large profit margin. Waste PFA is purchased for several hundred dollars per ton. After processing, it can be sold for about 3000 or 4000, with some profits reaching 18,000 to 2,000. Generally like film, 40 to 60 tons can be produced a month, like film material can be produced 90 to 120 tons a month, like white transparent, can buy 9,300; Colored, can sell for more than 8,000; Greenhouse film can sell for more than 6,000. Waste film from paper mills can sell for 3,300 to 3,500.

The selling price of regenerated PFA is only 50% of that of new PFA, which has great competitive advantage. Since 2000, China has imported 2 million tons of waste PFA from abroad every year, and it has increased at a rate of 10% every year. However, in China, the waste PFA reached 11 million tons in 2004 alone, most of which have not been used, and new PFA raw materials are still being put into use continuously. It can be seen that the waste PFA regeneration market is broad.

This article comes from:www.tflpfa.com

Popular reading:Evaluation method of antibacterial PFA particles