Preparation method of high-finish polytetrafluoroethylene tube

A technology of polytetrafluoroethylene pipe and polytetrafluoroethylene, which is applied in the direction of coating, can solve the problem of low finish, achieve high surface finish, meet strict requirements, and reduce surface roughness

Pending Publication Date: 2022-03-25
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of preparation method of high smoothness polytetrafluoroethylene pipe aiming at the problem that current polytetrafluoroethylene pipe smoothness is low and limit its application, the polytetrafluoroethylene pipe smoothness that adopts this preparation method to make is relative to Existing PTFE tubing has been completely and thoroughly improved, along with other performance indicators such as tensile strength

Method used

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  • Preparation method of high-finish polytetrafluoroethylene tube
  • Preparation method of high-finish polytetrafluoroethylene tube
  • Preparation method of high-finish polytetrafluoroethylene tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Mixing: Select polytetrafluoroethylene dispersion resin DF2041 with SSG of 2.186 and extrusion pressure of 51.3MPa at a compression ratio of 1600:1. First, DF2041 is screened with an 8-mesh screen, and then added with a resin weight of 20 % additives, mixed evenly;

[0030] (2) Ripening: put the mixed material at 35°C for 18 hours;

[0031] (3) Preforming: pre-press molding the matured material, the molding pressure is 2.5MPa, and the pressure is kept for 25min;

[0032] (4) Extrusion: Put the preformed blank into the extruder, control the temperature of the material cavity to 40°C and the temperature of the head to 66°C, and control the extrusion speed to 3.0m / min to obtain a raw tube of 4.0-5.0mm;

[0033] (5) Drying and sintering: the extruded pipe passes through the heating furnace, and the temperature from the inlet of the drying section of the heating furnace to the outlet of the sintering section gradually increases. agent, the temperature of the sintering ...

Embodiment 2

[0038] (1) Mixing: Select polytetrafluoroethylene dispersion resin DF2041 with SSG of 2.180 and extrusion pressure of 56.6MPa at a compression ratio of 1600:1. First, DF2041 is screened with an 8-mesh screen, and then the resin weight 18 % additives, mixed evenly;

[0039] (2) Curing: put the mixed material at 30°C for 22 hours;

[0040] (3) Preforming: pre-press molding the matured material, the molding pressure is 2.0MPa, and the pressure is kept for 30min;

[0041] (4) Extrusion: Put the preformed blank into the extruder, control the temperature of the material cavity to 40°C and the temperature of the head to 60°C, and control the extrusion speed to 1.5m / min to obtain a raw tube of 8.5-10.5mm;

[0042] (5) Drying and sintering: the extruded pipe passes through the heating furnace, and the temperature from the inlet of the drying section of the heating furnace to the outlet of the sintering section gradually increases. agent, the temperature of the sintering section is 36...

Embodiment 3

[0047] (1) Mixing: Select polytetrafluoroethylene dispersion resin DF-2048 with SSG of 2.171 and extrusion pressure of 55.7MPa at a compression ratio of 1600:1. First, sieve DF-2048 with an 8-mesh screen, and then Add 20% additives by resin weight and mix well;

[0048] (2) Ripening: put the mixed material at 40°C for 12 hours;

[0049] (3) Preforming: pre-press molding the matured material, the molding pressure is 2.3MPa, and the pressure is kept for 25min;

[0050] (4) Extrusion: Put the preformed blank into the extruder, control the temperature of the material cavity to 40°C and the temperature of the head to 70°C, and control the extrusion speed to 2.8m / min to obtain a raw tube of 4.0-5.0mm;

[0051] (5) Drying and sintering: the extruded pipe passes through the heating furnace, and the temperature from the inlet of the drying section of the heating furnace to the outlet of the sintering section gradually increases. agent, the temperature of the sintering section is 360-...

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Abstract

The invention belongs to the technical field of polytetrafluoroethylene materials, and particularly relates to a preparation method of a high-smoothness polytetrafluoroethylene tube. The preparation method comprises the following steps: (1) sieving a raw material polytetrafluoroethylene dispersion resin; (2) mixing the materials; (3) curing; (4) performing; (5) extruding; (6) drying and sintering; and finally, the polytetrafluoroethylene extrusion pipe obtained after drying and sintering in the step (6) is subjected to PFA emulsion impregnation. Compared with the existing polytetrafluoroethylene tube, the smoothness of the polytetrafluoroethylene tube prepared by the preparation method is completely and thoroughly improved. The preparation method is simple in process, easy to operate, good in process continuity and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of polytetrafluoroethylene materials, and in particular relates to a preparation method of a high-gloss polytetrafluoroethylene pipe. Background technique [0002] Due to its high molecular weight, PTFE resin has a high melt viscosity, so it cannot have good fluidity in the molten state like conventional plastic melt processing. Generally, as long as the high surface finish of the mold is controlled during processing, the surface of the processed product will It has a high finish. However, due to the particularity of the PTFE tube preparation process, there are two factors that affect the surface finish of the PTFE extruded tube: (1) During the extrusion process of the raw tube billet, it needs to pass through the die to generate shear Fiberization occurs due to force, but the effect of shear force will form longitudinal marks on the green tube blank; (2) microscopic grooves or protrusions are produced due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/09B29C37/00B29C67/04B29C71/00B29B13/10B29K27/18
CPCB29C48/09B29C37/0092B29C67/04B29C71/0009B29B13/10B29K2027/18
Inventor 刘长海陈越韩桂芳付师庆谭宏伟
Owner SHANDONG DONGYUE POLYMER MATERIAL
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