CN102278477A - Polyimide sealing element and manufacturing method thereof - Google Patents
Polyimide sealing element and manufacturing method thereof Download PDFInfo
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- CN102278477A CN102278477A CN2011101487800A CN201110148780A CN102278477A CN 102278477 A CN102278477 A CN 102278477A CN 2011101487800 A CN2011101487800 A CN 2011101487800A CN 201110148780 A CN201110148780 A CN 201110148780A CN 102278477 A CN102278477 A CN 102278477A
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Abstract
The invention relates to a polyimide sealing element and a manufacturing method thereof, in particular to a sealing element of a large-size motor bearing block and a manufacturing method thereof. The polyimide sealing element is prepared from the following raw materials in parts by weight: 60-70 parts of polyimide, 30-40 parts of glass fiber, 3-5 parts of graphite and 0.5-2 parts of processing aid. The manufacturing method comprises the following steps of: feeding the raw materials into a three-dimensional mixer according to weight proportions, uniforming stirring at normal temperature, then quantitatively adding the uniformly-mixed raw materials into a die, putting the die into a sintering furnace at 340-350 DEG C and sintering for 6-8h, then transferring the sintered die to a 50-100ton press machine and pressing under the pressure of 50-100ton for 8-10min to form a blank, and then carrying out fine finishing on the blank on a machine tool according to the actual size of the product. The polyimide sealing element manufactured by the method disclosed by the invention has the advantages of long service life, little deformation of product size due to temperature change, wear resistance, oil resistance and high temperature resistance.
Description
Technical field
The present invention relates to a kind of polyimide seal part and preparation method thereof.Especially for Sealing of large-size machine bearing support and preparation method thereof.
Background technique
At present, the Sealing that is applied to the large-size machine bearing support is combined by a Sealing shield ring and a seal ring usually, temperature is generally between 80-100 in the bearing support, during machine operation, the main shaft high speed rotating, temperature raises in the bearing support to making, and lubricant oil takes place to flow, this just requires Sealing must block mobile grease, prevents to leak; And this bearing support adopts special process to make, and once leak, just must carry out repair and replacement;
The existing employed Sealing of large-size machine bearing support is all made by ultra high molecular polyethylene or by teflon, the teflon product has splendid wear-resisting, high temperature resistant, corrosion resistance, its shortcoming is that workpiece size changes greatly along with temperature variation, and the resistance to high temperature of ultra-high molecular weight polyethylene is poor.
Because the Sealing that these two kinds of materials are made all has a common shortcoming; be exactly along with variation of temperature; the size distortion of Sealing is big, causes its working life short, because the motor shaft bearing mostly is bulky complex; repair and replacement expense once is big; dead time is long, and it is ageing-resistant just to require Sealing to have, oil resistant, wear-resisting; can in high temperature, work for a long time, and keep dimensional stability.Guarantee that with this motor has the better seal effect in the work for a long time, satisfies the needs that equipment does not normally have the operation of leaking.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of wear-resistance and oil-resistance, high temperature resistant is provided, ageing-resistant, can in high temperature, work for a long time and keep dimensionally stable, long service life, polyimide seal part that stress deformation is little and preparation method thereof.Guarantee that with this motor has the better seal effect in the work for a long time, satisfies the needs that equipment does not normally have the operation of leaking.
Purpose of the present invention is achieved through the following technical solutions: a kind of preparation method of polyimide seal part, it is characterized in that described polyimide seal part is to be made by following raw material and step,
(1) weight proportion of described each raw material is:
Polyimide fine powder 60-70 part, glass fibre fine powder 30-40 part,
Graphite fine powder 3-5 part, processing aid 0.5-2 part, the granularity of above-mentioned fine powder raw material is less than or equal to 300 orders;
Described graphite is middle particle prismatic graphite fine powder, and described glass fibre is the alkali-free glass fibre fine powder, and described processing aid powder is that plasticizing agent and remover mix by 1: 1 weight ratio; Described plasticizing agent is a molybdenum disulfide, and remover is a methyl-silicone oil;
(2) described each step is:
A, will form four kinds of raw materials of polyimide seal part, and, put in the three-dimensional mixer and stir at normal temperatures, promptly be mixed with mixed material by above-mentioned weight proportion;
B, the raw material after will mixing evenly join in the steel die, deliver to and carry out sintering in the sintering furnace, and sintering temperature is 340 ℃-350 ℃, and sintering time is 6-8 hour, will be with the taking-up of material steel die behind the sintering;
C, the band material steel die after will taking out move to be put in 50 tons of-100 tons of oil hydraulic presses and are molded into embryo, after clamp time is 8-10 minute, obtain the embryo spare of Sealing after the demoulding, the embryo spare actual size according to the Sealing goods on lathe with Sealing forms the fine finishing of embryo spare at last.Promptly obtain the polyimide seal part by above-mentioned preparation method.
This preparation method be with above-mentioned raw materials join in the mixing machine mixed at normal temperatures evenly after, mixed raw material after evenly quantitatively joined puts into the sintering furnace sintering in the mould, move then and be put into that compression molding becomes embryo in the press, after the demoulding, obtain embryo spare; Actual size according to goods forms the fine finishing of embryo spare on lathe at last.
The present invention compared with prior art has following outstanding advantage and effect thereof:
(1) this polyimide seal part long service life, wear-resistance and oil-resistance, high temperature resistant, dimensionally stable; Can in high temperature, work for a long time and keep dimensionally stable.
(2) this polyimide seal part can be carried more than one times the working life on large-size machine bearing support Sealing, and maintenance dismounting back Sealing still keeps original state, and non-cracking, nothing are softened, and do not have phenomenons such as distortion.
(3) this polyimide seal part is after compression molding becomes embryo, and last lathe fine finishing forms, and it is little to have the size Control scope, the characteristics that yield rate is high.
In a word, this polyimide seal part had both solved the defective of teflon, had remedied the deficiency of ultra-high molecular weight polyethylene again; Guaranteed that motor has the better seal effect in the work for a long time, satisfied equipment and normally do not had the needs that leakage moves.
Embodiment
A kind of preparation method of polyimide seal part is characterized in that described polyimide seal part is to be made by following raw material and step,
(1) weight proportion of described each raw material is:
Polyimide fine powder (Changzhou still section's speciality polymer Materials Co., Ltd is produced trade mark SKPI-M30, mold pressing level) 60-70 part,
The glass fibre fine powder is alkali-free glass fibre fine powder (production of intelligence Ninghua, Nanjing worker Co., Ltd) 30-40 part,
The graphite fine powder is middle particle prismatic graphite fine powder (production of intelligence Ninghua, Nanjing worker Co., Ltd) 3-5 part,
Processing aid 0.5-2 part, described processing aid are that plasticizing agent and remover mix by 1: 1 weight ratio; Described plasticizing agent is molybdenum disulfide (production of intelligence Ninghua, Nanjing worker Co., Ltd), and remover is methyl-silicone oil (production of Liuyang City's organosilicon factory);
The granularity of above-mentioned fine powder raw material is less than or equal to 300 orders;
(2) described each step is:
A, will form four kinds of raw materials of polyimide seal part, and, put in the three-dimensional mixer and stir at normal temperatures, promptly be mixed with mixed material by above-mentioned weight proportion;
B, the raw material after will mixing evenly join in the steel die, deliver to and carry out sintering in the sintering furnace, and sintering temperature is 340 ℃-350 ℃, and sintering time is 6-8 hour, will be with the taking-up of material steel die behind the sintering;
C, the band material steel die after will taking out move to be put in 50 tons of-100 tons of oil hydraulic presses and are molded into embryo, after clamp time is 8-10 minute, after the demoulding, obtain the embryo spare of Sealing, the embryo spare actual size according to the Sealing goods on lathe with Sealing forms the fine finishing of embryo spare at last.Promptly by above-mentioned preparation method obtain polyimide seal part long service life, the product size because of temperature variation be out of shape little, but wear-resistance and oil-resistance, high temperature resistant.
Formulation examples
62 parts of example 1, polyimide fine powders, 38 parts of glass fibre fine powders, 3.5 parts of graphite fine powders, 0.7 part of processing aid fine powder.
65 parts of example 2, polyimide fine powders, 35 parts of glass fibre fine powders, 4.0 parts of graphite fine powders, 1.5 parts of processing aid fine powders.
68 parts of example 3, polyimide fine powders, 32 parts of glass fibre fine powders, graphite fine powder part 4.5,1.8 parts of processing aid fine powders.
Claims (2)
1. the preparation method of a polyimide seal part is characterized in that described polyimide seal part is to be made by following raw material and step,
(1) weight proportion of described each raw material is:
Polyimide fine powder 60-70 part, glass fibre fine powder 30-40 part, graphite fine powder 3-5 part, processing aid 0.5-2 part, the granularity of above-mentioned fine powder raw material is less than or equal to 300 orders;
Described graphite is middle particle prismatic graphite fine powder, and described glass fibre is the alkali-free glass fibre fine powder, and described processing aid powder is that plasticizing agent and remover mix by the 1:1 weight ratio; Plasticizing agent is a molybdenum disulfide, and remover is a methyl-silicone oil;
(2) described each step is:
A, will form four kinds of raw materials of polyimide seal part, and, put in the three-dimensional mixer and stir at normal temperatures, promptly be mixed with mixed material by above-mentioned weight proportion;
B, the raw material after will mixing evenly join in the steel die, deliver to and carry out sintering in the sintering furnace, and sintering temperature is 340 ℃-350 ℃, and sintering time is 6-8 hour, will be with the taking-up of material steel die behind the sintering;
C, the band material steel die after will taking out move to be put in 50 tons of-100 tons of oil hydraulic presses and are molded into embryo, after clamp time is 8-10 minute, after the demoulding, obtain the embryo spare of Sealing, the embryo spare actual size according to the Sealing goods on lathe with Sealing forms the fine finishing of embryo spare at last.
2. the polyimide seal part of the method for claim 1 preparation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101487800A CN102278477A (en) | 2011-06-03 | 2011-06-03 | Polyimide sealing element and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101487800A CN102278477A (en) | 2011-06-03 | 2011-06-03 | Polyimide sealing element and manufacturing method thereof |
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| CN102278477A true CN102278477A (en) | 2011-12-14 |
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| CN2011101487800A Pending CN102278477A (en) | 2011-06-03 | 2011-06-03 | Polyimide sealing element and manufacturing method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5284904A (en) * | 1993-05-27 | 1994-02-08 | E. I. Du Pont De Nemours And Company | Low thermal expansion polyimide compositions |
| EP1029893A2 (en) * | 1999-02-16 | 2000-08-23 | Nichias Corporation | Resin composition |
| CN1313361A (en) * | 2000-03-13 | 2001-09-19 | 中国科学院化学研究所 | Refractory antiwear polyimide as sealing material and its preparing process and application |
| CN1379850A (en) * | 1999-10-21 | 2002-11-13 | 大金工业株式会社 | Seal ring |
| CN102022544A (en) * | 2011-01-06 | 2011-04-20 | 武汉理工大学 | Mechanical seal friction pair material and preparation method thereof |
-
2011
- 2011-06-03 CN CN2011101487800A patent/CN102278477A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5284904A (en) * | 1993-05-27 | 1994-02-08 | E. I. Du Pont De Nemours And Company | Low thermal expansion polyimide compositions |
| EP1029893A2 (en) * | 1999-02-16 | 2000-08-23 | Nichias Corporation | Resin composition |
| CN1379850A (en) * | 1999-10-21 | 2002-11-13 | 大金工业株式会社 | Seal ring |
| CN1313361A (en) * | 2000-03-13 | 2001-09-19 | 中国科学院化学研究所 | Refractory antiwear polyimide as sealing material and its preparing process and application |
| CN102022544A (en) * | 2011-01-06 | 2011-04-20 | 武汉理工大学 | Mechanical seal friction pair material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 俞吉英: "填充聚酰亚胺密封环的试制及应用", 《工程塑料应用》 * |
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Application publication date: 20111214 |