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A kind of preparation method of pcb bar material

A bar and hard alloy technology, which is applied in the field of extrusion molding agent and its preparation, achieves the effects of less defects, low ash content and small bending deformation

Active Publication Date: 2019-12-24
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the above forming agents are suitable for the preparation and production of small-diameter ultra-fine cemented carbide PCB rods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Extrusion molding agent, preparation and application thereof to ultrafine hard alloy PCB rods with a diameter of 1.5 mm.

[0027] Extrusion molding agent and its preparation:

[0028] 1. 0.16Kg polymethyl methacrylate, 0.08Kg glyceryl stearate, and 0.76Kg methyl benzoate used as binder, surfactant and solvent respectively are made into 1Kg material, and its mass percentage is respectively: 16% , 8%, 76%; wherein methyl benzoate and glyceryl stearate are liquid, and polymethyl methacrylate is solid (the following examples are the same);

[0029] ② Add the above ingredients into a water bath mixer for mixing and stirring, the heating temperature is 70°C, and the stirring time is 0.8h, and finally the cemented carbide extrusion molding agent is obtained.

[0030] Application of this extrusion molding agent in ultra-fine carbide PCB rods with a diameter of 1.5mm:

[0031] ① Put 0.1Kg of PEG and 10Kg of cemented carbide raw materials (5% binder phase Co, 0.5% in...

Embodiment 2

[0039] Extrusion molding agent, preparation and its application in 2.1mm diameter ultra-fine cemented carbide PCB rods.

[0040] Extrusion molding agent and its preparation:

[0041] 1. 0.128Kg polymethyl methacrylate, 0.064Kg glyceryl stearate, 1.408Kg methyl benzoate as binding agent, tensio-active agent, solvent respectively are made into 1.6Kg material, and its mass percent is respectively: 8 %, 4%, 88%;

[0042] ②Add the above ingredients into a water bath mixer for mixing and stirring, the heating temperature is 75°C, and the stirring time is 3.0h, and finally the cemented carbide extrusion molding agent is obtained.

[0043] The application of this extrusion molding agent in ultra-fine cemented carbide PCB rods with a diameter of 2.1mm:

[0044] ①Put 0.4Kg of PEG and 20Kg of cemented carbide raw materials (9% binder phase Co, 1.2% inhibitor Cr3C2+VC, and the balance is 0.4μm ultrafine WC) into a ball mill containing grinding balls and wet grinding media Mixing and ba...

Embodiment 3

[0052] Extrusion molding agent, preparation and its application in 1.0mm diameter ultra-fine cemented carbide PCB rod.

[0053] Extrusion molding agent and its preparation:

[0054] 1. 0.3Kg polymethyl methacrylate, 0.15Kg glyceryl stearate, and 1.05Kg methyl benzoate used as binder, surfactant, and solvent respectively are made into 1.5Kg material, and their mass percentages are respectively: 20 %, 10%, 70%;

[0055] ②Add the above ingredients into a water bath mixer for mixing and stirring, the heating temperature is 90°C, and the stirring time is 2.0h, and finally the cemented carbide extrusion molding agent is obtained.

[0056] Application of this extrusion molding agent in ultra-fine carbide PCB rods with a diameter of 1.0mm:

[0057] ① Put 0.3Kg of PEG and 10Kg of cemented carbide raw materials (8% binder phase Co, 0.9% inhibitor Cr3C2+VC, and the balance is 0.2μm ultrafine WC) into a ball mill containing grinding balls and wet grinding media Mixing and ball milling ...

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Abstract

The invention discloses an extrusion molding agent suitable for ultrafine hard alloy PCB rods, which consists of 8-20% binder polymethyl methacrylate and 4-10% surfactant glycerin stearate ester, 70-90% solvent methyl benzoate; the above-mentioned raw materials are added into a water bath stirrer to mix and stir to obtain the forming agent; the application of the forming agent in the preparation of ultrafine hard alloy PCB rods includes mixing ultrafine Cemented carbide raw materials and 0.8% to 3.0% PEG are directly put into a ball mill containing grinding balls and wet grinding media for mixing and ball milling; the slurry is dried and granulated to obtain a cemented carbide mixture; the mixture and 7% to 15% The molding agent is mixed uniformly; extruding the bar blank in the extruder; drying, removing the solvent in the extrusion molding agent; semi-processing the blank; There are no defects such as pores and cracks inside, and the product performance is stable and controllable.

Description

technical field [0001] The present invention relates to an extrusion molding agent and its preparation, and its application in ultrafine cemented carbide rods, in particular to an extrusion molding agent suitable for ultrafine cemented carbide PCB rods, its preparation, and its application . Background technique [0002] PCB (Printed circuit board) Chinese name is printed circuit board, also known as printed circuit board, printed circuit board, is an important electronic component. Tungsten carbide PCB rods are mainly used to make PCB drill bits, which have excellent characteristics such as high rigidity, high hole position accuracy, good hole wall quality, and long life. With the development of modern industry, the PCB industry requires circuit boards to be made smaller and more powerful, so the number of holes on the current PCB circuit board is increasing, and the aperture is getting smaller and smaller. For high-quality small-diameter Demand for ultra-fine carbide PCB...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22B22F1/00C22C1/05C22C29/08
CPCC22C1/051C22C29/08B22F3/227B22F1/10
Inventor 龙宁华孟小卫
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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