Preparation method of polytetrafluoroethylene heat-exchange tube
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A technology of polytetrafluoroethylene and heat exchange tube, which is applied in the field of fluoroplastics processing, can solve the problem of the processing length and wall thickness of polytetrafluoroethylene push tube. problems, to achieve excellent chemical stability and self-lubrication, easy operation, long service life
Inactive Publication Date: 2016-04-27
TIANJIN TIANSU SCI & TECH GROUP
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Problems solved by technology
[0003] The core component of the waste heat recovery device is the heat exchange tube. The metal heat exchange tube currently used is mainly suitable for medium and low temperature flue gas. In the ultra-low temperature flue gas, the corrosion problem of the metal heat exchange tube has not been solved, resulting in a very short service life of the recovery device. (1-2 years), return on investment income is almost zero
Due to the shortcomings of PTFE push tubes in terms of processing length, wall thickness, heat transfer efficiency, etc., the application in the field of flue gas waste heat in thermal power plants is restricted
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Embodiment 1
[0036] A method for preparing a polytetrafluoroethylene heat exchange tube is characterized in that: the polytetrafluoroethylene heat exchange tube is prepared by a continuous pushing process, and the preparation process:
[0037] 1. Raw material preparation
[0038] The polytetrafluoroethylene dispersion resin and the Mobil ISOPARG extrusion aid are placed in a mixing environment for 8 hours in a ratio of 80% by mass of polytetrafluoroethylene and 20% of extrusion aid. Mixing ambient temperature: 19±2°C, relative humidity: 50±5%.
[0039] 2. Raw material mixing
[0040] Mix the PTFE dispersion resin and extrusion aid after standing still according to the ratio, put it into the mixing bottle, and then put it on the mixer to rotate for 15 minutes, the speed is set at 15 rpm, and use the mixer to mix;
[0041] 3. Curing at constant temperature
[0042] Put the mixed raw materials into the incubator for more than 12 hours, and set the temperature of the incubator at 35°C, so ...
Embodiment 2
[0055] A method for preparing a polytetrafluoroethylene heat exchange tube for flue gas waste heat recovery, which is prepared by a continuous pushing process, and the preparation process:
[0056] 1. Raw material preparation
[0057] The polytetrafluoroethylene dispersion resin and the extrusion aid (Mobil ISOPARG) are placed in a mixing environment for 10 hours according to the mass percentage of 90% polytetrafluoroethylene and 10% extrusion aid. Mixing ambient temperature: 19±2°C, relative humidity: 50±5%.
[0058] 2. Raw material mixing
[0059]Mix the PTFE dispersion resin and extrusion aid after standing still according to the ratio, put it into the mixing bottle, and then put it on the mixer to rotate for 15 minutes, the speed is set at 15 rpm, and use the mixer to mix;
[0060] 3. Curing at constant temperature
[0061] Put the mixed raw materials into the incubator for 14 hours, and set the temperature of the incubator at 45°C, so that the extrusion aid can fully ...
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Abstract
The invention relates to a preparation method of a polytetrafluoroethylene heat-exchange tube and belongs to the technical field of fluoroplastic processing. The preparation method of the polytetrafluoroethylene heat-exchange tube comprises steps as follows: (1) mixing of raw materials: polytetrafluoroethylene dispersion resin and an extrusion aid are mixed by a mixer; (2) constant-temperature curing: constant-temperature curing is performed at the temperature of 30-50 DEG C; (3) pre-pressing of a blank: the raw materials are guided into a material cavity of a blank making machine, and a pressing block is added for pressurizing; (4) pushing extrusion: the blank is sent into a material cavity of an extruding machine for pushing extrusion; (5) oil removal and drying: the extrusion aid in an extruded tube is heated to be dried and cleaned; (6) high-temperature sintering: high-temperature sintering is performed in four intervals; (7) setting processing: the crystallinity of the inside of the tube is adjusted through quenching, the hardness and the flexibility of the tube are controlled, and the polytetrafluoroethylene heat-exchange tube is prepared. The preparation method has the advantages that the technology is simple, operation is convenient, the product has the over-length, the thin wall and the good consistency, the tube is high in heat exchange coefficient, corrosion-resistant, good in self-lubricating performance and long in service life, and the like.
Description
technical field [0001] The invention belongs to the technical field of fluoroplastic processing, and in particular relates to a preparation method of a polytetrafluoroethylene heat exchange tube. Background technique [0002] At present, energy resources are related to the overall economic and social development. Thermal power plants provide more than 80% of the country's electricity, and at the same time, consume nearly 60% of the country's coal and 20% of industrial water. In order to reduce heat loss and improve the efficiency of the power generation boiler, it is necessary to install a waste heat recovery device at the tail of the boiler, which can absorb the heat of the boiler flue gas, reduce the temperature of the flue gas, reduce coal consumption, and improve energy efficiency. At the same time, it can also reduce the emission of pollutants and PM2.5 particles, which is beneficial to environmental protection. [0003] The core component of the waste heat recovery d...
Claims
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Application Information
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