Recovery processing method of PET (Polyethylene Terephthalate) polyester and high-strength and high-flexibility polyester fiber
A processing method and recycling technology, applied in the direction of single-component copolyester rayon, melt spinning, etc., can solve the problems of difficulty in producing high-strength and high-elongation staple fibers and the inability to prepare polyester fibers, etc.
Inactive Publication Date: 2013-04-03
肇庆浚荣非织造材料有限公司
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Problems solved by technology
[0002] At present, the production process of using recycled PET to produce ordinary three-dimensional and two-dimensional hollow staple fibers is relatively mature; however, limited by the existing recycling process, recycled PET is still unable to produce high-strength and high-elongation polyester fibers
Moreover, in the existing polyester staple fiber technology, the production of high-strength and high-elongation staple fiber is also a recognized problem
In the existing polyester spinning technology, high breaking strength and high elongation are in opposition. If high strength is required, the elongation of the fiber will be low. If the fiber needs high elongation, the breaking strength will decrease.
Method used
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[0024] This example provides a process for preparing high-strength and high-strength polyester staple fibers using PET recycled bottle flakes. The specific process is as follows: figure 1 As shown, the continuous drying method is adopted in the pre-spinning production process of the regenerated short fiber, the drying temperature is controlled at 100-180°C, the drying time is controlled at 1-8 hours, and the recycled PET bottle flakes are dried in a continuous drying tower After reaching the moisture content requirement for spinning, the moisture content is ≦200ppm; then it enters the screw extruder, the temperature of each zone of the screw machine is set at 250-330°C, and the recycled PET bottle flakes are extruded and melted by the screw machine to become a melt and then transported In a two-stage melt filter, the temperature of the filter is set at 250-330°C. After the PET melt is filtered through two stages, most of the mechanical impurities and solid impurities are filter...
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The invention relates to the field of PET (Polyethylene Terephthalate) polyester production and processing, and in particular relates to a recovery processing method of the PET polyester. The method comprises the steps of: recovering PET polyester by a chemical method, wherein a mixed liquid of ethylene glycol and a catalyst is added into a PET polyester melt after the recovered PET polyester is melted and filtered for alcoholysis and re-polymerization reaction. According to the processing method provided by the invention, ethylene glycol is added into the PET polyester melt and overlong molecular chains in the melt are recombined to form intermittent long molecular chains, so that the recombined PET high polymer not only has high strength of long molecular chains, but also has high flexibility of intermittent long molecular chains, therefore, the high-strength and high-flexibility polyester fiber is prepared.
Description
technical field [0001] This application relates to the field of PET polyester production and processing, in particular to a method for recycling waste PET polyester materials, a PET polyester processing method extended by this method, and the preparation of PET polyester obtained by the processing method of this application High strength and high elongation polyester fiber. Background technique [0002] At present, the production process of using recycled PET to produce ordinary three-dimensional and two-dimensional hollow staple fibers is relatively mature; however, limited by the existing recycling process, recycled PET is still unable to produce high-strength and high-elongation polyester fibers. Moreover, in the existing polyester staple fiber technology, the production of high-strength and high-elongation staple fiber is also a recognized problem. In the existing polyester spinning technology, high breaking strength and high elongation are opposite. If high strength is...
Claims
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Login to View More IPC IPC(8): C08G63/183C08G63/78D01F6/84D01D5/08
Inventor 许国雄李绍亮张国华
Owner 肇庆浚荣非织造材料有限公司