Red powder for retouching and preparation method thereof

A technology for red powder and plate repairing, which is applied to the field of plate repairing red powder and its preparation, can solve the problems that the repairing pen cannot meet the requirements of precise line repairing plate, the original red powder has poor adhesion, and the cost of repairing images is high, and the price is low. , Easy to operate, good repair effect

Pending Publication Date: 2017-07-25
CHENGDU AEROSPACE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a red powder for repairing boards, which solves the problems of poor adhesion of the original red powder in the prio

Method used

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  • Red powder for retouching and preparation method thereof
  • Red powder for retouching and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1

[0026] Determine the raw material ratio and dissolution temperature

[0027] Experiment with different weight ratios of shellac and ferric oxide powder, and the influence of dissolution temperature on the state of red powder debugged, and determine the weight ratio and dissolution temperature of the raw materials.

[0028] Experimental design: The shellac is used for quantitative treatment, by continuously adjusting the weight and dissolution temperature of the iron trioxide powder, and dissolving it in an appropriate amount of absolute ethanol, observing and analyzing the adjusted red powder state to determine the weight of the raw material. Than the dissolution temperature.

[0029] Operation method: add shellac into absolute ethanol and soak for 2-3 minutes, stir to dissolve it, add in a small amount of ferric oxide powder several times, and stir evenly to get it.

[0030] Table 1 Raw material ratio and dissolution temperature table

[0031]

[0032]

[0033] test ...

Example Embodiment

[0037] Example 2

[0038] Strong acid resistance test verification: simulated electroplating process test

[0039] Preparation of red powder: Add 50g shellac to 50mL of absolute ethanol at 25°C and soak for 2-3 minutes, then stir to dissolve it, add 15g of ferric oxide powder several times in small amounts, and stir evenly to obtain.

[0040] Write "Small Achievement" in red powder on the Hall cell test piece, and use the pattern plating bath as the Hall cell solution, and electroplate the Hall cell test piece coated with "Small Achievement" at 2A plating parameters for 75 minutes. After taking it out, carefully observe the three words "small results" on the board. The results showed that neither red powder shedding nor honeycomb red powder appeared on the words "small achievement", indicating that the present invention has better adhesion and strong acid resistance.

Example Embodiment

[0041] Example 3

[0042] Equipment: Guangzhou Julong Vacuum Etching Film Stripping Line, model JL-1601ES.

[0043] Strong acid resistance test verification: over etching section test

[0044] The Hall cell test piece after the simulated electroplating process test in Example 2 was pressed at a speed of 1.5m / min and 1.5-2.0kg / cm 2 , Downward pressure 2.0-2.5kg / cm 2 The pressure passes the acid etching section. It can be seen from the Hall groove test piece that has passed through the acid-etched section that the areas not coated with red powder are completely etched, and the areas coated with red powder show "small results" intact, and there is no honeycomb shape, indicating that the present invention has a good effect. Strong acid resistance.

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PUM

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Abstract

The invention discloses red powder for retouching, aiming at solving the problems in the prior art that the adhesion force of original red powder is not good, a retouching pen cannot meet retouching requirements of precision lines, the cost for repairing an image is relatively high and the effect is not good. The red powder is prepared from the following raw materials in parts by weight: 10 parts of shellac and 2 to 4 parts of iron sesquioxide powder. A preparation method of the red powder for retouching comprises the following steps: weighing the shellac and the iron sesquioxide powder according to the parts by weight; adding the shellac into ethanol and dissolving to obtain a shellac ethanol solution; adding the iron sesquioxide powder into the shellac ethanol solution obtained by step B and uniformly stirring to obtain the red powder for retouching. The red powder for retouching has a very good repairing effect on a layout image and has the advantages that the raw materials are easy to obtain, a process is simple, the operation is convenient and the price is low.

Description

technical field [0001] The invention belongs to the technical field of printed circuit boards, and in particular relates to a red powder for board repairing and a preparation method thereof. Background technique [0002] During the pattern transfer process of printed circuit boards, impurity particles in the air adhere to the board surface, and defects such as sand holes and gaps will be formed on the image of the board surface after development. Therefore, after the pattern transfer, it is necessary to use red powder to correct the defects or Defects are properly repaired. There are two processing techniques for printed boards after graphic transfer, the first is acid etching process, and the second is graphic electroplating process, so the red powder used for board repair must meet the following conditions at the same time: 1. It is non-toxic and harmless to the human body ; 2. Soluble in strong alkali; 3. Insoluble in strong acids, especially hydrochloric acid, fluoboric...

Claims

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Application Information

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IPC IPC(8): C04B26/22
CPCC04B26/22C04B2111/00844C04B22/06
Inventor 付学明马丽马忠义徐晨
Owner CHENGDU AEROSPACE COMM EQUIP CO LTD
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