Method utilizing thermal spraying technique for preparing polyimide coating and product of method

A polyimide coating, polyimide technology, applied in the direction of coating, the device for coating liquid on the surface, etc., can solve the problems of low production efficiency, length limitation, etc., achieve low cost, low equipment cost, Efficient effect

Active Publication Date: 2016-08-31
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all have their limitations and disadvantages, such as the dipping method, immersing the clean substrate in the prepared sol-gel, and lifting the substrate out at a constant speed after a certain period of time, so as to obtain a substrate covered with a film layer, and finally reheating to obtain Film, this method has simple equipment and simple process, but aluminum powder is often stuck on the back, and the length is limited, and the production efficiency is low, so it is rarely used now

Method used

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  • Method utilizing thermal spraying technique for preparing polyimide coating and product of method
  • Method utilizing thermal spraying technique for preparing polyimide coating and product of method
  • Method utilizing thermal spraying technique for preparing polyimide coating and product of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 1. Use a mortar to grind 4,4'-diaminodiphenyl ether (ODA) and pyromellitic dianhydride (PMDA) respectively, and sieve the pyromellitic dianhydride with a 100-mesh sieve. Put 4,4'-diaminodiphenyl ether in a common oven and bake at 110°C for 4-5 hours before use; put pyromellitic dianhydride in a common oven and bake at 170°C for 4-5 hours before use .

[0059] 2. Weigh 10.002g of 4,4'-diaminodiphenyl ether (ODA) after the above pretreatment, dissolve it in 200ml of N,N-dimethylformamide (DMF), stir to make it completely dissolve ( 5min); then weigh 10.906g of pyromellitic dianhydride (PMDA) after the above-mentioned pretreatment, and add and stir in a small amount to the above-mentioned solution several times; continue stirring for 8-10h after adding completely to obtain 10wt.% Thermosetting polyimide precursor slurry of polyamic acid (PAA);

[0060] 3. Wash and dry the glass substrate with acetone, ethanol, and deionized water in sequence;

[0061] 4. In the flame pr...

Embodiment 2

[0066] 1. Use a mortar to grind 4,4'-diaminodiphenyl ether (ODA) and pyromellitic dianhydride (PMDA) respectively, and sieve the pyromellitic dianhydride with a 100-mesh sieve. Put 4,4'-diaminodiphenyl ether in a common oven and bake at 110°C for 4 to 5 hours; place pyromellitic dianhydride in a common oven and bake at 170°C for 4 to 5 hours.

[0067] 2. Weigh 10.002g of 4,4'-diaminodiphenyl ether (ODA), dissolve it in 200ml of N,N-dimethylformamide (DMF), stir to dissolve it completely (5min); then weigh Get 10.906g of pyromellitic dianhydride (PMDA), add a small amount of multiple times to the above solution and stir; continue stirring for 8 to 10 hours after adding completely to obtain a thermosetting polyamic acid containing 10wt.% polyamic acid (PAA). Imide precursor slurry;

[0068] 3. Clean the substrate with acetone, ethanol, and deionized water in sequence, and use 60 mesh brown corundum sand to roughen the surface of the Q345 steel sheet. The air pressure used for s...

Embodiment 3

[0074] 1. Use a mortar to grind 4,4'-diaminodiphenyl ether (ODA) and pyromellitic dianhydride (PMDA) respectively, and sieve the pyromellitic dianhydride with a 100-mesh sieve. Put 4,4'-diaminodiphenyl ether in a common oven and bake at 110°C for 4 to 5 hours; place pyromellitic dianhydride in a common oven and bake at 170°C for 4 to 5 hours.

[0075] 2. Weigh 10.002g of 4,4'-diaminodiphenyl ether (ODA), dissolve it in 400ml of N,N-dimethylformamide (DMF), stir to dissolve completely (5min); then weigh Get 10.906g pyromellitic dianhydride (PMDA), add and stir in a small amount to the above-mentioned solution several times; continue to stir for 8-10 hours after adding completely to obtain a thermosetting polyamic acid containing 5wt.% polyamic acid (PAA). Imide precursor slurry;

[0076] 3. Wash and dry the glass substrate with acetone, ethanol, and deionized water in sequence;

[0077] 4. In the flame preparation process of polyimide coating, the atomizing nozzle with a diam...

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Abstract

The invention discloses a method utilizing a thermal spraying technique for preparing polyimide coating and a product of the method. The method includes steps of 1, preparing polyimide spray material which is a thermosetting polyimide precursor sizing agent, a thermoplastic polyimide precursor sizing agent or a thermoplastic polyimide powder; 2, performing surface deoiling and roughening on a substrate; 3, sending the spray material prepared in step 1 into thermal spraying flame flow and forming the polyimide coating on the processed substrate surface through spraying. The method is simple in technique, high in efficiency and suitable for field construction. Spray limits of work piece sizes and shapes are removed and the cost is low. The prepared polyimide composite coating can be combined well with the substrate and the microstructures are adjustable. The method can be applied to fields of electrics, mechanics, thermotics, anti-radiation and medical science and the like.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a method for preparing polyimide coatings using thermal spraying technology and products thereof. Background technique [0002] Polyimide (PI) has excellent comprehensive properties and is a heterocyclic polymer compound widely used in polymer materials. It is characterized by imide rings, and the aromatic ring structure makes PI in the range of 200-400 It has good electrical, mechanical, thermal and radiation resistance properties within ℃. Polyimide material has good comprehensive properties, and its temperature resistance can reach above 400°C. It is the polymer material with the best temperature resistance in industrial applications. It has excellent electrical insulation properties and belongs to F-H class insulation materials. PI has excellent electrical and mechanical properties that other polymers do not possess. It generally starts to decompose at around 500°C, and it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/00B05D1/10C08G73/10C09D179/08
CPCB05D1/10B05D1/62B05D2505/50C08G73/1071C09D179/08
Inventor 刘奕龚永锋黄晶所新坤陈秀勇周平李华
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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