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Carbon rubber embedded resistance paste and preparation method of carbon rubber embedded resistance material

A technology of embedding resistors and carbon glue, which is applied in the field of preparation of graphite/epoxy resin type resistor paste compounds, can solve the problems of poor resistance resistance stability of carbon glue and affect the performance of embedded resistor circuit boards, etc., and achieve mechanical Excellent performance, heat resistance, good storage stability, and excellent thermal properties

Inactive Publication Date: 2013-09-11
GUANGDONG DANBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, one of the most critical issues related to carbon screen printing resistance inks that are not covered by the above patent technologies is: the resistance drift (increase in resistance value) caused by the interface corrosion between copper and carbon powder, making the carbon screen resistance in high temperature and high humidity The resistance stability in the environment is very poor, generally greater than 20%, which seriously affects the performance of the embedded resistor circuit board in some harsh environments
Obviously, the latter method is easier to operate in terms of technology. However, in the face of thousands of stabilizers of all kinds, finding a suitable stabilization accelerator can effectively prevent the occurrence of resistance drift. easy thing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The formula is as follows:

[0044] O-methyl novolac epoxy resin (ECN) 100 parts

[0045] graphite 15 parts

[0046] Carbon black 10 parts

[0047] Novolak resin 55 parts

[0048] 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30) 2 parts

[0049] Ethylene glycol diglycidyl ether 33 parts

[0050] Disperbyk-101 type dispersant 1 part

[0051] Butyl titanate 5 parts

[0052] Tributyl phosphate 0.6 parts

[0053] Carboxyl-terminated liquid nitrile rubber 25 parts

[0054] Benzotriazole (BTA) 1 part

[0055] Tolyl benzotriazole (TTA) 1 part

[0056] According to the above formula, the preparation and curing of carbon rubber resistor paste are completed according to the following process:

[0057] (1). Add 15g of graphite / 10g of carbon black mixture into the 5% butyl titanate (5g) solution prepared in alcohol, stir well until the solvent evaporates; at the same time, weigh 100g of o-methyl novolac epoxy resin (ECN ), 33g of ethylene glycol diglycidyl ether and 25g of...

Embodiment 2

[0067] The difference between this example and Example 1 is only that: the addition of graphite / carbon black is changed to 3 parts / 2 parts, and other components are unchanged. The performance of the cured resistance sample strip obtained by testing is as follows:

[0068] Resistivity: 650Ω.cm;

[0069] Square resistance accuracy error: ≤10%;

[0070] Moisture and heat resistance: after 85%RH / 85℃ / 500 hours, the change of resistance value is less than 10%;

[0071] Solder resistance: 260℃ / 5s / 3 times, resistance change is less than 10%;

[0072] Temperature coefficient of resistance (TCR): TCR≤200ppm / ℃;

[0073] Slurry storage period (at room temperature): ≥12 months;

[0074] Bending strength: 76.53MPa;

[0075] Bending strain: 1.83%.

Embodiment 3

[0077] The difference between this example and Example 1 is only that: the addition of graphite / carbon black is changed to 0.9 part / 0.6 part, and other components are unchanged, and the performance of the obtained cured object resistance sample strip is as follows:

[0078] Resistivity: 1900Ω.cm;

[0079] Square resistance accuracy error: ≤10%;

[0080] Moisture and heat resistance: after 85%RH / 85℃ / 500 hours, the change of resistance value is less than 10%;

[0081] Solder resistance: 260℃ / 5s / 3 times, resistance change is less than 10%;

[0082] Temperature coefficient of resistance (TCR): TCR≤200ppm / ℃;

[0083] Slurry storage period (at room temperature): ≥12 months;

[0084] Bending strength: 70.42MPa;

[0085] Bending strain: 1.68%.

[0086] From the above three examples, it can be seen that according to the above formulations, the resistance of the cured carbon glue with accurate resistance, stability and excellent mechanical properties can be obtained. The resistance...

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Abstract

The invention discloses a carbon rubber embedded resistance paste and a preparation method of a carbon rubber embedded resistance material. The carbon rubber embedded resistance paste comprises adhesive resin, a conductive filler, a curing agent, an accelerator, a coupling agent and a stability accelerant. Specifically, the adhesive resin is o-methyl phenolic epoxy resin; the conductive filler is a mixture of graphite and carbon black; the stability accelerant is a mixture of benzotriazole (BTA) and tolytriazole (TTA). The method is the preparation method of the paste. Compared with the prior art, the carbon rubber resistance material obtained according to the formula has the advantages of wide resistance range, high precision, good environmental stability, heat resistance and storage stability, and excellent mechanical properties, and can well meet the material characteristic requirements for embedding resistance in a circuit board.

Description

technical field [0001] The invention relates to the preparation of a graphite / epoxy resin type resistance slurry compound, in particular to a preparation method of a carbon glue embedded resistance slurry and a carbon glue embedded resistance material. Background technique [0002] Among the components mounted on the PCB, resistor components have the most solder joints, accounting for more than half of the mounted components. Especially in mobile phones, most of the mounted components other than resistor components are tending to be denser. One of the solutions for high-density parts installation is the resistor element. Embedding the resistor inside the PCB can save a lot of surface area and space on the PCB, and can also avoid unnecessary parasitic inductance and Parasitic capacitance can make signal transmission more complete. At present, there are several methods for embedding resistors inside PCBs: etching Ni-P resistive layer method, screen printing resistive ink meth...

Claims

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Application Information

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IPC IPC(8): H01C7/00H01C17/00
CPCH01C17/0658H01C17/0652
Inventor 刘萍张双庆
Owner GUANGDONG DANBOND TECH
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