CN-122010397-A - Preparation method of high-temperature-resistant quartz capillary tube and high-temperature-resistant quartz capillary tube

CN122010397ACN 122010397 ACN122010397 ACN 122010397ACN-122010397-A

Abstract

The application provides a preparation method of a high-temperature-resistant quartz capillary tube and the high-temperature-resistant quartz capillary tube, and the preparation method of the high-temperature-resistant quartz capillary tube comprises the following steps of providing a quartz tube with a hollow inside; the method comprises the steps of drawing a quartz tube to a heating furnace along the gravity direction, inputting a first protective gas into the quartz tube, melting a zone part of the quartz tube, which is close to one end of the ground, and forming a capillary body, drawing the capillary body to carry out annealing treatment, detecting the pipe diameter of the capillary body, adjusting the flow of the first protective gas and the drawing speed of the capillary body based on the pipe diameter of the capillary body until the pipe diameter of the capillary body is qualified, coating a high temperature resistant layer on the periphery of the capillary body, and solidifying to obtain the high temperature resistant quartz capillary.

Inventors

ZHANG YI
CAO SHANSHAN
ZHU QIANSHENG
MA KAI
YOU GUANGLEI
WANG ZHEN

Assignees

中天科技光纤有限公司
江苏中天科技股份有限公司
江东科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260205

Claims (10)

1. The preparation method of the high-temperature-resistant quartz capillary tube is characterized by comprising the following steps of: Providing a quartz tube with a hollow interior; drawing the quartz tube to a heating furnace along the gravity direction, and inputting a first protective gas into the quartz tube, wherein the region of the quartz tube, which is close to one end of the ground, is melted and forms a capillary body; drawing the capillary body to carry out annealing treatment; detecting the pipe diameter of the capillary body, and adjusting the flow rate of the first protective gas and the traction speed of the capillary body based on the pipe diameter of the capillary body until the pipe diameter of the capillary body is qualified; and coating a high-temperature resistant layer on the periphery of the capillary body, and curing to obtain the high-temperature resistant quartz capillary.
2. The method of manufacturing a high temperature resistant quartz capillary tube according to claim 1, wherein the quartz tube has an outer diameter M of 30 mm≤M≤50 mm, an inner diameter N of 5 mm≤N≤40 mm, and N < M.
3. The method of claim 2, wherein the median value of the outer diameter of the capillary body is M, M is 100 μm≤m≤500 μm, and the median value of the inner diameter of the capillary body is N,0< N < M and N/m≤N/M.
4. The method of manufacturing a high temperature resistant quartz capillary tube according to claim 3, wherein the pulling speed of the quartz tube is V1,0mm/min < V1<1mm/min, and the pulling speed of the capillary body when pulled to the annealing treatment is V2, v2= (M 2 /m 2 ) ×v1.
5. The method of manufacturing a high temperature resistant quartz capillary tube according to claim 4, wherein detecting the tube diameter of the capillary tube body, adjusting the flow rate of the first shielding gas and the drawing speed of the capillary tube body based on the tube diameter of the capillary tube body, comprises the steps of: Detecting a median value m1 of the outer diameter of the capillary body; If the median value m1 of the outer diameter of the capillary body is larger than m, increasing the drawing speed V2 of the capillary body; if the median value m1 of the outer diameter of the capillary body is smaller than m, the drawing speed V2 of the capillary body is reduced.
6. The method of manufacturing a high temperature resistant quartz capillary tube according to claim 4, wherein detecting the tube diameter of the capillary tube body, adjusting the flow rate of the first shielding gas and the drawing speed of the capillary tube body based on the tube diameter of the capillary tube body, further comprises the steps of: detecting a median n1 of the inner diameter of the capillary body; If the median value n1 of the inner diameter of the capillary body is larger than n, reducing the flow rate of the first protective gas; and if the median value n1 of the inner diameter of the capillary body is smaller than n, increasing the flow rate of the first protective gas.
7. The method for preparing a high temperature resistant quartz capillary tube according to claim 1, wherein the high temperature resistant layer is a polyimide coating, the polyimide coating is obtained by polymerization reaction of a polyimide precursor solution, and the polyimide precursor solution comprises diamines and dianhydride compounds, an organic solvent, nano powder and a dispersing agent; Wherein the mass ratio of the diamine to the dianhydride compound to the organic solvent to the nano powder to the dispersing agent is respectively 11-21%, 74-86%, 0.2-1.4% and 0.1-0.6%.
8. The method of preparing a high temperature resistant quartz capillary tube according to claim 7, wherein the diamine compound comprises one or more of 4,4 '-diaminodiphenyl ether, 4' -diaminobinaphthyl, isophoronediamine, and benzoguanamine; the dianhydride compound comprises one or more of pyromellitic dianhydride, biphenyl tetracarboxylic dianhydride and hexafluorodianhydride; the organic solvent comprises one or more of sulfolane, N-diethyl acetamide and N-methyl pyrrolidone; The nanopowder comprises one or more of silica, titania, and alumina; The dispersant comprises one or more of a high molecular weight block copolymer, an unsaturated polycarboxylic acid polymer and a modified polyurethane polymer.
9. The method of manufacturing a high temperature resistant quartz capillary tube according to claim 1, wherein said coating a high temperature resistant layer on the outer periphery of said capillary tube body comprises the steps of: Coating the qualified capillary body; And curing the capillary body after the coating operation is completed.
10. A high temperature resistant quartz capillary tube prepared by the method of any one of claims 1 to 9.

Description

Preparation method of high-temperature-resistant quartz capillary tube and high-temperature-resistant quartz capillary tube Technical Field The application relates to the technical field of capillaries, in particular to a preparation method of a high-temperature-resistant quartz capillary and the high-temperature-resistant quartz capillary. Background In order to improve the high temperature resistance of the quartz capillary, a temperature resistant coating is mostly sprayed on the surface of the cured quartz capillary, and then the temperature resistant coating is cured, so that the bonding force between the temperature resistant coating and the quartz capillary is weak, the porosity is high, the coating is easy to peel off, air holes or cracks, the temperature resistance and the tensile strength of the quartz capillary are poor, and the reliability of the quartz capillary is affected. Disclosure of Invention The application provides a preparation method of a high-temperature-resistant quartz capillary tube and the high-temperature-resistant quartz capillary tube, which are used for solving the problem that the reliability of the quartz capillary tube is affected due to weak bonding force between the quartz capillary tube and a temperature-resistant coating and high void ratio in the prior art. The application provides a preparation method of a high-temperature-resistant quartz capillary, which comprises the steps of providing a quartz tube with a hollow interior, drawing the quartz tube to a heating furnace along the gravity direction, inputting a first protective gas into the quartz tube, melting a region part of the quartz tube, which is close to one end of the ground, and forming a capillary body, drawing the capillary body for annealing treatment, detecting the pipe diameter of the capillary body, adjusting the flow of the first protective gas and the drawing speed of the capillary body based on the pipe diameter of the capillary body until the pipe diameter of the capillary body is qualified, coating a high-temperature-resistant layer on the periphery of the capillary body, and curing to obtain the high-temperature-resistant quartz capillary. In one possible embodiment, the quartz tube has an outer diameter M,30 mm≤M≤50 mm, an inner diameter N,5 mm≤N≤40 mm, and N < M. In one possible embodiment, the median value of the outer diameter of the capillary body is M,100 μm≤m≤500 μm, and the median value of the inner diameter of the capillary body is N,0< N < M and N/m≤N/M. In one possible embodiment, the pulling speed of the quartz tube is V1,0mm/min < V1<1mm/min, and the pulling speed of the capillary body when pulled to the annealing treatment is V2, v2= (M 2/m2) ×v1. In one possible implementation manner, detecting the pipe diameter of the capillary body, and adjusting the flow rate of the first protection gas and the drawing speed of the capillary body based on the pipe diameter of the capillary body, wherein the method comprises the following steps: Detecting a median value m1 of the outer diameter of the capillary body; If the median value m1 of the outer diameter of the capillary body is larger than m, increasing the drawing speed V2 of the capillary body; if the median value m1 of the outer diameter of the capillary body is smaller than m, the drawing speed V2 of the capillary body is reduced. In one possible implementation manner, detecting the pipe diameter of the capillary body, adjusting the flow rate of the first protection gas and the drawing speed of the capillary body based on the pipe diameter of the capillary body, and further includes the following steps: detecting a median n1 of the inner diameter of the capillary body; If the median value n1 of the inner diameter of the capillary body is larger than n, reducing the flow rate of the first protective gas; and if the median value n1 of the inner diameter of the capillary body is smaller than n, increasing the flow rate of the first protective gas. In one possible implementation mode, the high-temperature resistant layer adopts a polyimide coating, wherein the polyimide coating is obtained through polymerization reaction of polyimide precursor solution, and the polyimide precursor solution comprises diamine and dianhydride compounds, organic solvents, nano powder and dispersing agents; Wherein the mass ratio of the diamine to the dianhydride compound to the organic solvent to the nano powder to the dispersing agent is respectively 11-21%, 74-86%, 0.2-1.4% and 0.1-0.6%. In one possible embodiment, the diamine compound comprises one or more of 4,4 '-diaminodiphenyl ether, 4' -diaminobinaphthyl, isophoronediamine, and benzoguanamine; the dianhydride compound comprises one or more of pyromellitic dianhydride, biphenyl tetracarboxylic dianhydride and hexafluorodianhydride; the organic solvent comprises one or more of sulfolane, N-diethyl acetamide and N-methyl pyrrolidone; The nanopowder comprises one or more of silica, titania, and alumina; T