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High-precision coated pad for PCB drilling

A high-precision, coating technology, used in coatings, polyamide coatings, etc., can solve the problems of easy moisture absorption, poor flatness, and large warpage of the backing plate for PCB drilling. Good wear and smoothness

Inactive Publication Date: 2020-03-31
东莞市项华电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The backing plate for PCB drilling is easy to absorb moisture during storage and use, resulting in large warpage and poor flatness of the backing plate for PCB drilling

Method used

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preparation example Construction

[0057] In the present invention, the preparation method of the coating at least includes the following steps:

[0058] (1) Mix the resin with water at room temperature and stir for 15-30min;

[0059] (2) Add filler, thickener, defoamer, antistatic agent to step (1) successively and stir for 20-40min;

[0060] (3) Before use, add curing agent to step (2), stir evenly, and get the product after discharging;

[0061] Most preferably, the coating is used within 48 hours after preparation.

[0062] In the present invention, adding the curing agent before use can avoid the phenomenon of polyethylene wax demulsification caused by the curing agent. The inventor thinks that the possible reason is: adding the curing agent before use can weaken the effect of the curing agent on the demulsification of the emulsified wax, inhibit the demulsification of the emulsified wax, prolong the demulsification time, and make the polyethylene wax form a uniform layer on the backing plate. Wax film,...

Embodiment 1

[0072] Embodiment 1 provides a kind of high-precision coating backing plate for PCB drilling, and the coating backing plate includes a base material and a coating coated on the upper and lower surfaces of the base material; wherein, the coating, by weight In terms of parts, at least include: 35 parts of resin, 61 parts of filler, 32 parts of thickener, 2 parts of defoamer, 2 parts of antistatic agent, 3 parts of curing agent, and 52 parts of water.

[0073] The base material is wood fiber board, purchased from Jiangsu Xinsu Building Materials Co., Ltd.

[0074] The resin is urea-formaldehyde resin, purchased from Shandong Moore Chemical Co., Ltd.

[0075] The filler is a combination of gypsum powder and titanium dioxide with a weight ratio of 1.5:1.

[0076] The thickener is a combination of erucamide, oleamide, polyamide wax and polyethylene wax, and the weight ratio is 6:5:1:4.

[0077] The defoamer is polysiloxane, purchased from Guangdong Zhongbang Fine Chemical Co., Ltd...

Embodiment 2

[0089] Embodiment 2 provides a kind of high-precision coating backing plate for PCB drilling, and the coating backing plate includes a base material and a coating coated on the upper and lower surfaces of the base material; wherein, the coating, by weight In terms of parts, at least include: 20 parts of resin, 50 parts of filler, 20 parts of thickener, 1 part of defoamer, 1 part of antistatic agent, 1 part of curing agent, and 45 parts of water.

[0090] The base material is wood fiber board, purchased from Jiangsu Xinsu Building Materials Co., Ltd.

[0091] The resin is urea-formaldehyde resin, purchased from Shandong Moore Chemical Co., Ltd.

[0092] The filler is a combination of gypsum powder and titanium dioxide with a weight ratio of 1:1.

[0093] The thickener is a combination of erucamide, oleamide, polyamide wax and polyethylene wax, and the weight ratio is 4:3:0.5:3.

[0094] The defoamer is polysiloxane, purchased from Guangdong Zhongbang Fine Chemical Co., Ltd. ...

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Abstract

The invention relates to the technical field of PCB drilling pads and especially relates to a high-precision coated pad for PCB drilling and a preparation method of same. The high-precision coated padincludes a substrate and coating layers coating the upper and lower surfaces thereof. The coating at least includes, by weight, 20-50 parts of resin, 50-70 parts of filler, 20-45 parts of a thickener, 1-5 parts of a defoamer, 1-5 parts of an antistatic agent, 1-5 parts of a curing agent, and 45-65 parts of water. The PCB drilling pad has a heat dissipating function, so that firstly, the temperature of a drilling needle is reduced and the drilling needle is fee of deformation, thus increasing drilling precision, and secondly, abrasion degree of the drilling needle is reduced, so that the drilling needle is prolonged in service life and reduced in breaking possibility. The pad is not liable to absorb moisture during storage and use, is low in wrapping degree and has great flatness.

Description

technical field [0001] The invention relates to the technical field of PCB drilling backing plates, in particular to a high-precision coating backing plate for PCB drilling and a preparation method thereof. Background technique [0002] The backing plate is a material that is placed under the board to be processed when the printed circuit board (referred to as PCB) is mechanically drilled to meet the processing technology requirements. The main functions of the backing plate are: 1. Reduce the burr of the base material drilling hole; 2. Protect the drilling machine table for the drilling process through the PCB board; 3. Reduce the temperature of the drill bit and reduce the wear of the drill bit; 4. Clean part of the drilling dirt on the drill bit; 5. Play its positioning function to a certain extent and improve the drilling accuracy. Backing boards for PCB drilling generally include high-density wood fiber boards, melamine wood backing boards, composite wood backing board...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D161/24C09D177/00C09D123/06C09D183/04C09D7/61C09D7/63C09D7/44
CPCC08K2003/2241C08K2003/3045C08K2201/017C08L2205/035C09D7/44C09D7/61C09D7/63C09D161/24C08L77/00C08L23/06C08L83/04C08K13/02C08K3/22C08K3/30C08K3/16C08K5/19
Inventor 李仁胜
Owner 东莞市项华电子科技有限公司
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