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Environment-friendly graphite resistance paste and preparation method thereof

A graphite resistor, an environmentally friendly technology, applied in the direction of heating element materials, etc., can solve the problems of poor stability of the mica board, harmfulness of the resistance slurry to the human body, poor matching of the mica board, etc.

Inactive Publication Date: 2012-01-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] It can be seen from the above that the quality of the resistance paste plays a vital role in heating equipment. The resistance paste is mainly composed of a conductive phase and an adhesive phase, and the adhesive phase is mainly lead-containing glass. The resistance paste prepared by the phase is harmful to the human body. Of course, there are also lead-free glass as the bonding phase of the resistance paste. The stability of the mica board prepared by the material is poor; in addition, because the square resistance of the resistance slurry is a fixed value, it cannot well meet the requirements of different power

Method used

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  • Environment-friendly graphite resistance paste and preparation method thereof
  • Environment-friendly graphite resistance paste and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] 1) Preparation of lead-free glass powder: take 60% Bi by weight percentage 2 o 3 , 20% of B 2 o 3 , 10% SiO 2 , 4% Al 2 o 3 , 3% TiO 2 , 2% of V 2 o 5 , and 1% Sb 2 o 3 , grind it into powder and pass through a 80-mesh sieve, then mix it evenly in a mixer and put it in a mortar, then transfer it to a high-temperature resistance furnace, keep it at 900°C for 30 minutes, and then take it out and immerse it in cold water for water Quenching to obtain glass slag, then put the above-mentioned obtained glass slag into a ball mill and mill for 4 hours to form glass powder, and finally pass the ball-ground glass powder through 400 sieves, then dry to obtain lead-free glass powder for use.

[0026] 2) Preparation of organic vehicle: take by weight 85% terpineol, 10% ethyl cellulose, 0.2% diethanolamide monoglyceride stearate as surfactant, 3.5% as leveling agent polydimethylsiloxane, and 1.3% polyethyl ether modified siloxane as a defoamer, put them in a beaker, and r...

Embodiment 2

[0029] 1) Preparation of lead-free glass powder: take 62% Bi by weight percentage 2 o 3 , 15% B 2 o 3 , 13% SiO 2 , 2.5% Al 2 o 3 , 2% TiO 2 , 5% of V 2 o 5 , and 0.5% Sb 2 o 3 , grind it into powder and pass through 80-mesh sieve, mix it evenly in a mixer, put it in a mortar, transfer it to a high-temperature resistance furnace, keep it at 930°C for 30 minutes, and then take it out and immerse it in cold water for water quenching , to obtain glass slag, then put the glass slag obtained above into a ball mill and ball mill for 4 hours to become glass powder, and finally pass the ball-ground glass powder through 400 sieves, then dry to obtain lead-free glass powder for use.

[0030] 2) Preparation of organic carrier: take by weight 85% terpineol, 8% ethyl cellulose, 1% nonylphenol polyoxyethylene as surfactant, 5% polyformaldehyde as leveling agent Phenyl phenyl siloxane, and 1% polyether modified siloxane as a defoamer, put into a beaker, react in a water bath at 90...

Embodiment 3

[0033]1) Preparation of lead-free glass powder: take 65% Bi by weight percentage 2 o 3 , 17% B 2 o 3 , 5% SiO 2 , 3% Al 2 o 3 , 1% TiO 2 , 4% of V 2 o 5 , and 5% Sb 2 o 3 , grind it into powder and pass through 80-mesh sieve, mix it evenly in a mixer, put it in a mortar, transfer it to a high-temperature resistance furnace, keep it at 950°C for 30 minutes, and then take it out and immerse it in cold water for water quenching , to obtain glass slag, then put the glass slag obtained above into a ball mill and ball mill for 4 hours to become glass powder, and finally pass the ball-ground glass powder through 400 sieves, then dry to obtain lead-free glass powder for use.

[0034] 2) Preparation of organic carrier: take by weight 86.5% terpineol, 7.5% ethyl cellulose, 5% fatty alcohol polyoxyethylene ether as surfactant, 0.5% organic base as leveling agent Modified polysiloxane, and 0.5% polyether modified siloxane as a defoaming agent, put them in a beaker, react in a w...

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Abstract

The invention provides environment-friendly graphite resistance paste and a preparation method thereof. The resistance paste comprises the following components by weight percent: 50-70% of conductive phase graphite powder, 5-30% of bonding-phase lead-free glass powder, 10-30% of organic carriers and an external additive used for adjusting the square resistance of the resistance paste, wherein the lead-free glass powder adopts the Bi-B-Si-Sb system; the organic carriers comprise organic solvents and additives; and the additives account for 0.1-8% of the total weight of the lead-free glass powder and the graphite powder. Besides, the resistance paste also comprises appropriate amount of external additive Al2O3, therefore, the resistance of the resistance paste can be adjusted according to different requirements to meet the requirements of all kinds of power.

Description

【Technical field】 [0001] The invention relates to a resistance slurry and a preparation method thereof, in particular to an environment-friendly graphite resistance slurry and a preparation method thereof. 【Background technique】 [0002] In colder regions, heating equipment is almost universally used in every household, and its types are also varied. With the continuous development of science and technology, a new type of heating equipment has appeared at present, which is to coat the configured resistance slurry on the mica board, thereby heating through the heating of the resistance slurry. [0003] It can be seen from the above that the quality of the resistance paste plays a vital role in heating equipment. The resistance paste is mainly composed of a conductive phase and an adhesive phase, and the adhesive phase is mainly lead-containing glass. The resistance paste prepared by the phase is harmful to the human body. Of course, there are also lead-free glass as the bond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B3/14
Inventor 蒲永平陈小龙赵新
Owner SHAANXI UNIV OF SCI & TECH
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