WO2020125466A1

WO2020125466A1 - Peek material annealing method

Info

Publication number: WO2020125466A1
Application number: PCT/CN2019/123912
Authority: WO
Inventors: 杨文光; 孙克原; 陈佩民; 靳予; 陈朝曦; 王孝刚; 夏炎; 林丰; 陈晓春
Original assignee: 南京肯特复合材料股份有限公司; 南京润特新材料有限公司
Priority date: 2018-12-18
Filing date: 2019-12-09
Publication date: 2020-06-25
Also published as: CN109334054A

Abstract

Disclosed by the present invention is a PEEK material annealing method, comprising the steps of: extruding a PEEK material into a rod shape or tube shape, and then placing same in a metal tube for annealing. According to the present invention, a PEEK rod or a PEEK tube is placed in the metal tube for annealing, so that the performance of the PEEK rod or the PEEK tube after annealing may be effectively improved. The metal tube has quick warming and cooling speeds, is easy to control, and may save energy.

Description

PEEK material annealing method

Technical field

The invention relates to a PEEK material annealing method and belongs to the technical field of composite materials.

Background technique

PEEK products in the thin and thick junctions, the thick parts cool slowly, and the thin parts cool fast, the joints will shrink unevenly, resulting in stress concentration. This phenomenon is more pronounced around metal inserts. If annealing treatment is not carried out, over a period of time, cracks may occur in stress-concentrated parts, or even crack or deformation. Therefore, PEEK products need to be annealed during the preparation process to eliminate internal stress, improve the crystallinity of the parts, thereby improving their strength and chemical resistance, and ultimately obtain the best dimensional stability. The annealing method is generally to immerse the product in hot water, or in a hot air cycle, but the annealing temperature distribution in hot air is not uniform enough, and the heat required for heating or cooling in hot water is too large.

Summary of the invention

The purpose of the present invention is to provide a PEEK material annealing method, which can effectively improve the performance of the PEEK material after annealing, and can ensure that the surface color of the PEEK material after annealing is uniform.

In order to achieve the above object, the technical scheme adopted by the present invention is: a method of annealing PEEK material, the steps of which are: extruding PEEK material into rods or tubes, and then placing them in a metal tube and annealing in a heating furnace, rod or tube PEEK materials The metal pipe is not exposed at both ends.

Preferably, the length of the metal tube is greater than or equal to the length of the PEEK rod or PEEK tube, so that the PEEK rod or PEEK tube can be completely inside the metal tube, and the inner diameter of the metal tube is slightly larger than the outer diameter of the PEEK rod or PEEK tube, so that When the PEEK rod or PEEK tube is put in or taken out, at the same time, the gap between the outer wall of the PEEK rod or PEEK tube and the inner wall of the metal tube is smaller, and the uniformity of the annealing atmosphere in the metal tube is better.

Preferably, the PEEK material is a PEEK monomer material or a PEEK composite material.

Preferably, the metal pipe is a seamless steel pipe.

Preferably, the annealing step is to place the metal tube and the PEEK rod or PEEK tube in the tube in a heating furnace to raise the temperature to 180-260°C, the heating rate is 8-30°C/h; constant temperature heat preservation; and then reduce to 150°C to room temperature After taking out, the cooling rate is 2～12℃/h.

Preferably, the constant temperature holding time is 0.5 to 2 hours per millimeter of product wall thickness.

Preferably, for PEEK tubes, the wall thickness refers to the difference between the outer wall radius and the inner wall radius; for PEEK rods, the wall thickness refers to the radius value. For PEEK pipes, the heat insulation is 0.5 to 1 hour per millimeter wall thickness; for PEEK rods, the heat insulation is 1 to 2 hours per millimeter wall thickness.

In the present invention, the PEEK rod or PEEK tube is placed in a metal tube and annealed in a heating furnace, in a uniform annealing atmosphere, the annealing effect is better, and the performance of the PEEK rod or PEEK tube after annealing can be effectively improved. The heating and cooling speed of the metal pipe is fast, easy to control, and only needs to ensure the uniform temperature of the metal pipe within a small range, which can effectively save energy. At the same time, the surface of the PEEK rod and the tube may be lighter and uniform due to the isolation of the PEEK rod and the outer tube.

detailed description

Example 1

A PEEK material annealing method, the steps are: extruding PEEK material into a rod or tube, and then placed in a metal tube, put together in a resistance furnace for annealing, metal tube is preferably seamless steel tube, low production cost, not easy to deform, can Repeated use can also use other metal tubes, such as seamless aluminum tubes, copper tubes, etc. The length of the metal tube is greater than or equal to the length of the PEEK rod or PEEK tube, and the two ends of the PEEK rod or PEEK tube do not protrude from the metal tube. The inner diameter of the metal tube is slightly larger than the outer diameter of the PEEK rod or PEEK tube. The annealing step is to put the metal tube and the PEEK rod or PEEK tube in the tube into a resistance furnace to raise the temperature to 180-260°C, and the heating rate is 8-30°C/ h; constant temperature and heat preservation, the time is 0.5 to 2 hours per millimeter of product wall thickness; then drop to 150 ℃ to room temperature and take out, the cooling rate is 2 to 12 ℃/h. For pipes, the wall thickness refers to the difference between the outer wall radius and the inner wall radius; for rods, the wall thickness refers to the radius value. Of course, for the holding time, the pipe should be slightly shorter, such as 0.5 to 1h per mm of wall thickness; the bar should be slightly longer, such as 1 to 2h per mm of wall thickness.

The performance test was performed on the prepared PEEK material, and the test results are shown in Table 1. The diameter of the PEEK rod in Table 1 is 12mm, and the conditions of heating, heat preservation and cooling are the same in the tube annealing and ordinary annealing. The heating rate is 10°C/h, the temperature is increased to 220°C, the heat is maintained for 12h, and the cooling rate is 10°C/h. Cool down to room temperature and remove.

Table 1 PEEK material performance test

Claims

A method for annealing a PEEK material. The steps are as follows: extruding the PEEK material into a rod or a tube, and then placing it in a metal tube to anneal in a heating furnace. The ends of the rod or tube PEEK material are not exposed to the metal tube.
The method for annealing a PEEK material according to claim 1, wherein the inner diameter of the metal tube is slightly larger than the outer diameter of the PEEK rod or PEEK tube.
The PEEK material annealing method according to claim 2, wherein the PEEK material is a PEEK monomer material or a PEEK composite material.
The PEEK material annealing method according to claim 3, wherein the metal tube is a seamless steel tube.
The method for annealing a PEEK material according to any one of claims 1 to 4, wherein the annealing step is to place the metal tube and the PEEK rod or the PEEK tube in the tube in a heating furnace to raise the temperature to 180-260°C, Heating rate 8～30℃/h; constant temperature heat preservation; then drop to 150℃～room temperature and take out, cooling rate 2～12℃/h.
The annealing method of PEEK material according to claim 5, characterized in that the constant temperature heat preservation time is 0.5 to 2 hours per millimeter of the product wall thickness.
The method for annealing a PEEK material according to claim 6, wherein for PEEK pipe, the wall thickness refers to the difference between the outer wall radius and the inner wall radius; for PEEK rods, the wall thickness refers to the radius value.
The method for annealing PEEK material according to claim 7, characterized in that: for PEEK pipes, the heat insulation is 0.5 to 1 hour per millimeter wall thickness; for PEEK rods, the heat insulation is 1 to 2 hours per millimeter wall thickness.