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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 prior art, the repairing pen cannot meet the repairing requirements of precise lines, the cost of repairing images is high, and the effect is not good

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

Embodiment 1

[0026] Determine the raw material ratio and dissolution temperature

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

[0028] Experimental design: Quantitative treatment of shellac, by continuously adjusting the weight and dissolution temperature of ferric oxide powder, and dissolving it in an appropriate amount of absolute ethanol, observing and analyzing the state of the debugged red powder, so as to determine the weight distribution of raw materials compared to the melting temperature.

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

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

[0031]

[0032]

[0033] test ...

Embodiment 2

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

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

[0040] Write "Small Achievement" on the Hall cell test piece with red powder, take the pattern electroplating bath as the Hall tank solution, and electroplate the Hall cell test piece coated with "Small Achievement" with the electroplating parameter of 2A for 75 minutes. After taking it out, carefully observe the words "small achievements" on the board. The result shows that neither red powder falls off nor honeycomb red powder appears on the three characters of "small results", which shows that the present invention has good adhesion and strong acid resistance.

Embodiment 3

[0042] Equipment: Guangzhou Julong vacuum etching film removal line, model JL-1601ES.

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

[0044] With the Hall cell test piece after the simulation electroplating process test among the embodiment 2 with 1.5m / min speed, press 1.5-2.0kg / cm 2 , Press down 2.0-2.5kg / cm 2 The pressure passes through the acid etching section. From the Hall cell test piece of the acid-etched section, it can be seen that the place not coated with red powder is completely etched, and the place coated with red powder shows "small results" intact, and there is no honeycomb, indicating that the present invention has good Acid-resistant properties.

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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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