CN104882755A - Graphite brush and preparation method thereof - Google Patents
Graphite brush and preparation method thereof Download PDFInfo
- Publication number
- CN104882755A CN104882755A CN201510175035.3A CN201510175035A CN104882755A CN 104882755 A CN104882755 A CN 104882755A CN 201510175035 A CN201510175035 A CN 201510175035A CN 104882755 A CN104882755 A CN 104882755A
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- Prior art keywords
- preparation
- electrographite brush
- phenolic resin
- modified phenolic
- weight portion
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
- H01R39/20—Contacts for co-operation with commutator or slip-ring, e.g. contact brush characterised by the material thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
- H01R39/20—Contacts for co-operation with commutator or slip-ring, e.g. contact brush characterised by the material thereof
- H01R39/22—Contacts for co-operation with commutator or slip-ring, e.g. contact brush characterised by the material thereof incorporating lubricating or polishing ingredient
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/12—Manufacture of brushes
Abstract
The present invention discloses a graphite brush and a preparation method thereof. The method comprises a step 1) of carrying out the contact reaction on the phenol, the formaldehyde, the sodium carbonate and the boric acid to prepare boron modified phenolic resin; a step 2) of mixing the boron modified phenolic resin, the graphite powder, the molybdenum disulfide, the rare earth fluoride and the metallic oxide to prepare a mixture; a step 3) of carrying out the cold pressing and thermal treatment on the mixture to prepare the graphite brush. The graphite brush has the excellent friction coefficient, density and bending intensity and has low resistivity.
Description
Technical field
The present invention relates to brush field, particularly, relate to a kind of electrographite brush and preparation method thereof.
Background technology
Electrographite brush adds the adhesive mixing compactings such as pitch, coal tar and resin in graphite to form.Electrographite brush has the advantage that quality is soft, resistivity is low and coefficient of friction is low, but because of impure more and easily make electrographite brush have lower bending intensity, has had a strong impact on the useful life of electrographite brush.
Summary of the invention
The object of this invention is to provide a kind of electrographite brush, this electrographite brush had that excellent coefficient of friction, resistivity are low, density and bending intensity, the method step simultaneously preparing this electrographite brush is simple, and raw material is easy to get.
To achieve these goals, the invention provides a kind of preparation method of electrographite brush, the method comprises:
1) phenol, formaldehyde, sodium carbonate and boric acid are carried out haptoreaction to prepare the operation of boron modified phenolic resin;
2) boron modified phenolic resin, graphite powder, molybdenum bisuphide, rare earth fluoride and metal oxide are carried out the operation mixing to prepare mixture;
3) under the existence of protection gas, also heat treatment of being carried out colding pressing by mixture is to prepare the operation of electrographite brush.
The present invention also provides a kind of electrographite brush, and this electrographite brush is obtained by above-mentioned preparation method.
By technique scheme, electrographite brush provided by the invention is by boron modified phenolic resin, graphite powder, molybdenum bisuphide, rare earth fluoride and metal oxide being carried out mixing, colding pressing and heat treatment is prepared from.Boron modified phenolic resin is adhesive, molybdenum bisuphide is kollag, excellent coefficient of friction, resistivity are low, density and bending intensity by the synergy of boron modified phenolic resin, molybdenum bisuphide, rare earth fluoride and metal oxide, this electrographite brush to be had, the method step simultaneously preparing this electrographite brush is simple, and raw material is easy to get.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
The invention provides a kind of preparation method of electrographite brush, the method comprises:
1) phenol, formaldehyde, sodium carbonate and boric acid are carried out haptoreaction to prepare the operation of boron modified phenolic resin;
2) boron modified phenolic resin, graphite powder, molybdenum bisuphide, rare earth fluoride and metal oxide are carried out the operation mixing to prepare mixture;
3) under the existence of protection gas, also heat treatment of being carried out colding pressing by mixture is to prepare the operation of electrographite brush.
In the present invention, in the operation preparing boron modified phenolic resin, the consumption of phenol, formaldehyde, sodium carbonate and boric acid can be selected in wide scope, in order to make obtained boron modified phenolic resin can be mutually compatible with graphite powder, molybdenum bisuphide, rare earth fluoride and metal oxide better, preferably, relative to the phenol of 1 weight portion, the consumption of formaldehyde is 0.8-1.2 weight portion, the consumption of sodium carbonate is 0.1-0.2 weight portion, and the consumption of boric acid is 0.05-0.15 weight portion.
In the present invention, in the operation preparing boron modified phenolic resin, in order to make boron modified phenolic resin have the excellent degree of polymerization, preferably, catalytic temperature is 70-100 DEG C, and the catalytic time is 4-8h.
In the present invention, in the operation preparing boron modified phenolic resin, in order to make boric acid can be better to the modified effect of phenolic resins, preferably, first phenol, formaldehyde and sodium carbonate are reacted 1-3h at 70-80 DEG C, then at 90-100 DEG C, react 3-5h after adding boric acid.
In the present invention, in the operation preparing mixture, have to make the electrographite brush prepared that excellent coefficient of friction, resistivity are low, density and bending intensity, preferably, rare earth fluoride is cerium fluoride and/or lanthanum fluoride, and metal oxide is antimony trioxide and/or lead oxide.
In the present invention, in the operation preparing mixture, the consumption of boron modified phenolic resin, graphite powder, molybdenum bisuphide, rare earth fluoride and metal oxide can be selected in wide scope, have to make electrographite brush that excellent coefficient of friction, resistivity are low, density and bending intensity, preferably, relative to the boron modified phenolic resin of 100 weight portions, the consumption of graphite powder is 70-90 weight portion, the consumption of molybdenum bisuphide is 10-15 weight portion, the consumption of rare earth fluoride is 5-8 weight portion, and the consumption of metal oxide is 8-12 weight portion.
In the present invention, in the operation preparing electrographite brush, the pressure of colding pressing and the time of colding pressing can be selected in wide scope, tightr in order to what make boron modified phenolic resin, graphite powder, molybdenum bisuphide, rare earth fluoride and metal oxide combine, preferably, the pressure of colding pressing is 20-25Mpa, and the time of colding pressing is 15-30min.
In the present invention, in the operation preparing electrographite brush, heat treated temperature and time can be selected in wide scope, in order to make boron modified phenolic resin, graphite powder, molybdenum bisuphide, fully bond between rare earth fluoride and metal oxide, preferably, heat treated temperature is 600-850 DEG C, and the heat treated time is 1-2h.
In the present invention, in order to make the particle more refinement of boron modified phenolic resin, graphite powder, molybdenum bisuphide, rare earth fluoride and metal oxide, preferably, before preparing the operation of electrographite brush, the method also comprises grinds mixture and the operation of sieving, feed particles like this owing to preparing electrographite brush is finer and smoother, thus make to combine between each raw material more tight, excellent coefficient of friction, resistivity are low, density and bending intensity to make electrographite brush have further.More preferably, in the operation of sieving, screen cloth is 60-100 order.
In the present invention, in order to prevent colding pressing and heat treated process in, air on composition on the impact of electrographite brush performance; cold moudling heat treatment is carry out under the existence of protector to prepare the operation of electrographite brush; consider from protected effect, preferably, protection gas is argon gas.
The present invention is a kind of electrographite brush also, and this electrographite brush is obtained by above-mentioned preparation method.This electrographite brush has that excellent coefficient of friction, resistivity are low, density and bending intensity.
Below will be described the present invention by embodiment.In following examples, coefficient of friction parameter is recorded by the method for JB/T8155-2001, resistance parameter is recorded by the method for JB/T6773-2011, density parameter is recorded by the graphite electrode carbon brush special density tester of Xiamen Qun Long Instrument Ltd., and bending intensity parameters is recorded by the flexible member tensile strength tester of Jinan Ling Yue precision instrument Co., Ltd.
In following examples, phenol is Zibo Zi great Chemical trade Co., Ltd, formaldehyde is the product of the open-minded Chemical Co., Ltd. of Dongguan City, sodium carbonate is the product of Hebei Xiang Sheng Chemical Co., Ltd., the product of boric acid Shanghai this Chemical Industry Science Co., Ltd of Yu, graphite powder is the product that Qingdao Fu Run reaches graphite Co., Ltd, molybdenum bisuphide is the product of Shanghai in Chemical Co., Ltd. of nation, cerium fluoride is the product of Shaanxi Lan Xin Chemical Co., Ltd., lanthanum fluoride is the product of Leshan Wo Naixi Electron Material Co., Ltd, antimony trioxide is the product of Tianjin chemical reagent supply and marketing company, lead oxide is the product of Qidong City Ming Cheng Chemical Co., Ltd..
Embodiment 1
1) at 85 DEG C, by the phenol of 10kg, the formaldehyde of 10kg, the sodium carbonate of 1.5kg and the acid reaction 6h of 1kg obtain boron modified phenolic resin;
2) by the boron modified phenolic resin of 10kg, the graphite powder of 8kg, the molybdenum bisuphide of 1.2kg, the cerium fluoride of 0.7kg, the antimony trioxide of 1kg carries out mixing obtained mixture;
3) said mixture is colded pressing under 22Mpa 25min and at 700 DEG C heat treatment 1.5h with obtained electrographite brush A1.
And the coefficient of friction of A1, resistivity, density and bending intensity are detected, testing result is in table 1.
Embodiment 2
1) at 70 DEG C, by the phenol of 10kg, the formaldehyde of 8kg, the sodium carbonate of 1kg and the acid reaction 4h of 0.5kg obtain boron modified phenolic resin;
2) by the boron modified phenolic resin of 10kg, the graphite powder of 7kg, the molybdenum bisuphide of 1kg, the lanthanum fluoride of 0.7kg, the lead oxide of 0.8kg carries out mixing obtained mixture;
3) said mixture is colded pressing under 20Mpa 15min and at 600 DEG C heat treatment 1h with obtained electrographite brush A2.
And the coefficient of friction of A2, resistivity, density and bending intensity are detected, testing result is in table 1.
Embodiment 3
1) at 100 DEG C, by the phenol of 10kg, the formaldehyde of 12kg, the sodium carbonate of 2kg and the acid reaction 8h of 1.5kg obtain boron modified phenolic resin;
2) by the boron modified phenolic resin of 10kg, the graphite powder of 9kg, the molybdenum bisuphide of 1.5kg, the cerium fluoride of 0.8kg, the antimony trioxide of 1.2kg carries out mixing obtained mixture;
3) said mixture is colded pressing under 25Mpa 30min and at 850 DEG C heat treatment 2h with obtained electrographite brush A3.
And the coefficient of friction of A3, resistivity, density and bending intensity are detected, testing result is in table 1.
Embodiment 4
Carry out according to the method for embodiment 1, difference is, the lanthanum fluoride of 0.7kg changes the cerium fluoride of 0.4kg and the lanthanum fluoride of 0.3kg into obtained electrographite brush A4.
And the coefficient of friction of A4, resistivity, density and bending intensity are detected, testing result is in table 1.
Embodiment 5
Carry out according to the method for embodiment 1, difference is, the lead oxide of 0.8kg changes the antimony trioxide of 0.4kg and the lead oxide of 0.4kg into obtained electrographite brush A5.
And the coefficient of friction of A5, resistivity, density and bending intensity are detected, testing result is in table 1.
Embodiment 6
Carry out according to the method for embodiment 1, difference is, in the operation preparing boron modified phenolic resin, first phenol, formaldehyde and sodium carbonate is reacted 2h at 80 DEG C, then at 100 DEG C, reacts 4h after adding boric acid with obtained electrographite brush A6.
And the coefficient of friction of A6, resistivity, density and bending intensity are detected, testing result is in table 1.
Comparative example 1
Carry out according to the method for embodiment 1, difference is, does not contain boric acid with obtained electrographite brush B1.And the coefficient of friction of B1, resistivity, density and bending intensity are detected, testing result is in table 1.
Comparative example 2
Carry out according to the method for embodiment 1, difference is, does not contain molybdenum bisuphide with obtained electrographite brush B2.And the coefficient of friction of B2, resistivity, density and bending intensity are detected, testing result is in table 1.
Comparative example 3
Carry out according to the method for embodiment 1, difference is, does not contain rare earth fluoride with obtained electrographite brush B3.And the coefficient of friction of B3, resistivity, density and bending intensity are detected, testing result is in table 1.
Comparative example 4
Carry out according to the method for embodiment 1, difference is, does not contain rare earth fluoride with obtained electrographite brush B4.And the coefficient of friction of B4, resistivity, density and bending intensity are detected, testing result is in table 1.
Table 1
| Coefficient of friction | Resistivity (μ Ω/m) | Density (g/cm 3) | Bending intensity (Mpa) | |
| A1 | 0.1 | 42 | 1.7 | 43 |
| A2 | 0.09 | 43 | 1.6 | 41 |
| A3 | 0.08 | 44 | 1.8 | 43 |
| A4 | 0.11 | 42 | 1.7 | 42 |
| A5 | 0.09 | 45 | 1.8 | 43 |
| A6 | 0.08 | 40 | 1.9 | 45 |
| B1 | 0.15 | 55 | 1.6 | 37 |
| B2 | 0.13 | 57 | 1.5 | 36 |
| B3 | 0.14 | 62 | 1.6 | 38 |
| B4 | 0.16 | 64 | 1.5 | 37 |
As seen from the above table, the present invention by boron modified phenolic resin, molybdenum bisuphide, rare earth fluoride and metal oxide being joined in graphite powder obtained electrographite brush, wherein the synergy of boron modified phenolic resin, molybdenum bisuphide, rare earth fluoride and metal oxide electrographite brush can be made to have excellent coefficient of friction, resistivity are low, density and bending intensity.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned execution mode, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible compound mode.
In addition, also can carry out combination in any between various different execution mode of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a preparation method for electrographite brush, is characterized in that, described method comprises:
1) phenol, formaldehyde, sodium carbonate and boric acid are carried out haptoreaction to prepare the operation of boron modified phenolic resin;
2) described boron modified phenolic resin, graphite powder, molybdenum bisuphide, rare earth fluoride and metal oxide are carried out the operation mixing to prepare mixture;
3) under the existence of protection gas, also heat treatment of being carried out colding pressing by described mixture is to prepare the operation of described electrographite brush.
2. preparation method according to claim 1, it is characterized in that, in the operation preparing boron modified phenolic resin, relative to the phenol of 1 weight portion, the consumption of described formaldehyde is 0.8-1.2 weight portion, the consumption of described sodium carbonate is 0.1-0.2 weight portion, and the consumption of described boric acid is 0.05-0.15 weight portion.
3. preparation method according to claim 1 and 2, is characterized in that, described catalytic temperature is 70-100 DEG C, and the described catalytic time is 4-8h;
Preferably, in the operation preparing boron modified phenolic resin, first phenol, formaldehyde and sodium carbonate are reacted 1-3h at 70-80 DEG C, then at 90-100 DEG C, react 3-5h after adding boric acid.
4. preparation method according to claim 1, is characterized in that, in the operation preparing mixture, described rare earth fluoride is cerium fluoride and/or lanthanum fluoride, and described metal oxide is antimony trioxide and/or lead oxide.
5. the preparation method according to claim 1 or 4, it is characterized in that, in the operation preparing mixture, relative to the described boron modified phenolic resin of 100 weight portions, the consumption of described graphite powder is 70-90 weight portion, the consumption of described molybdenum bisuphide is 10-15 weight portion, and the consumption of described rare earth fluoride is 5-8 weight portion, and the consumption of described metal oxide is 8-12 weight portion.
6. the preparation method according to claim 1 or 4, is characterized in that, in the operation of the described electrographite brush of preparation, described in the pressure of colding pressing be 20-25Mpa, described in time of colding pressing be 15-30min.
7. the preparation method according to claim 1 or 4, is characterized in that, in the operation of the described electrographite brush of preparation, described heat treated temperature is 600-850 DEG C, and the described heat treated time is 1-2h.
8. the preparation method according to claim 1 or 4, is characterized in that, before the operation of the described electrographite brush of preparation, the method also comprises grinds described mixture and the operation of sieving;
Preferably, described in the operation of sieving, described screen cloth is 60-100 order.
9. the preparation method according to claim 1 or 4, is characterized in that, in the operation of the described electrographite brush of preparation, described protection gas is argon gas.
10. an electrographite brush, is characterized in that, described electrographite brush is obtained by the preparation method described in any one in claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510175035.3A CN104882755A (en) | 2015-04-14 | 2015-04-14 | Graphite brush and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510175035.3A CN104882755A (en) | 2015-04-14 | 2015-04-14 | Graphite brush and preparation method thereof |
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| CN104882755A true CN104882755A (en) | 2015-09-02 |
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| CN201510175035.3A Pending CN104882755A (en) | 2015-04-14 | 2015-04-14 | Graphite brush and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649406A (en) * | 2018-04-26 | 2018-10-12 | 大同新成新材料股份有限公司 | A kind of composite material preparation process for manufacturing brush |
-
2015
- 2015-04-14 CN CN201510175035.3A patent/CN104882755A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649406A (en) * | 2018-04-26 | 2018-10-12 | 大同新成新材料股份有限公司 | A kind of composite material preparation process for manufacturing brush |
| CN108649406B (en) * | 2018-04-26 | 2020-01-31 | 大同新成新材料股份有限公司 | composite material preparing process for manufacturing electric brush |
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Application publication date: 20150902 |
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