CN101608042A - Micropore polyfluortetraethyleseal seal plate and preparation method thereof - Google Patents
Micropore polyfluortetraethyleseal seal plate and preparation method thereof Download PDFInfo
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- CN101608042A CN101608042A CNA2009100546289A CN200910054628A CN101608042A CN 101608042 A CN101608042 A CN 101608042A CN A2009100546289 A CNA2009100546289 A CN A2009100546289A CN 200910054628 A CN200910054628 A CN 200910054628A CN 101608042 A CN101608042 A CN 101608042A
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- micropore
- polyfluortetraethyleseal
- seal plate
- ptfe
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Abstract
The invention discloses a kind of expanded microporous polytetra fluoroethylene-EPTEE (PTFE) sealing plate material and preparation method thereof.Described micropore polyfluortetraethyleseal seal plate is to be formed through foaming modification by teflon resin, and wherein teflon resin accounts for 50%～90% of total mass, and all the other are whipping agent.Micropore polyfluortetraethyleseal seal plate of the present invention is to be prepared from by steps such as pre-treatment, mixing, mold pressing, drying, high temperature sintering, coolings.Compared with prior art, micropore polyfluortetraethyleseal seal plate of the present invention has chemically-resistant characteristic and the heat resistance identical with pure PTFE, higher compression recovery performance, excellent creep resistance relaxation property and long term seal performance, conventional P TFE be can extensively substitute, PTFE and varicosity PTFE sealing material filled, be specially adapted to plastics and fiber reinforced plastic pipe and equipment, high corrosion operating mode is to the requirement of sealing.
Description
Technical field
The present invention relates to a kind of teflon (PTFE) material and preparation method thereof, specifically, relate to a kind of expanded microporous polytetra fluoroethylene-EPTEE (PTFE) sealing plate material and preparation method thereof.
Background technology
Since E.I.Du Pont Company developed polytetrafluoroethylene (PTFE) in 1938, tetrafluoroethylene just (can bear except fused basic metal with its good chemical resistance, all strong acid outside fluorochemical and the molten sodium hydroxide, strong oxidizer, the effect of reductive agent and various organic solvents), (it is moving for excellent self lubricity, static friction coefficient all is lower than 0.04, be ideal oil-free lubricatoin material), heat resistance (can in-190～260 ℃ wide temperature range, use) preferably, (volume resistance can reach 1018 ohmcms to excellent electric insulating, dielectric loss is little, the voltage breakdown height), not viscosity (being the solid material of surface energy minimum) and resistance to weathering of fabulous surface, premium propertiess such as uninflammability (limited oxygen index is below 90) and nonstaining property are widely used in oil, chemical industry, food, industries such as medicine.At present, PTFE except that be widely used in anticorrosion and antiseized, because of its good performance very general in the application in sealing material field.
But PTFE is just to have serious creep (cold flow) phenomenon at normal temperatures as the deficiency of sealing material maximum.In order to improve the creep resisting ability of PTFE, at present most widely used is exactly filling-modified, puffing and foaming modification technology, the wherein filling-modified and external part of puffing technology enterprise has reached higher level, though the research of domestic this respect is big with external difference, but there have been part enterprise and scientific research personnel to carry out the work of this respect, and obtained certain achievement.Chinese patent discloses a kind of sealing member of modified Teflon in low creep (publication number: 1687223A), it adopts the filling-modified PTFE that improved as the creep relaxation of sealing member material existence and the defective of cold flow, proportioning is: teflon resin 50%-90%, all the other are barium sulfate, add barium sulfate and can be applicable to multiple corrosive medium, high-quality fibrillation effect is provided, solves existing creep relaxation of common filled polytetrafluoroethylene sheet material and cold flow problem.Chinese patent discloses a kind of preparation method's (publication number: CN 101007242A) of expanding microporous poly tetrafluoroethylene, the preparation method of expanding microporous poly tetrafluoroethylene comprises batch mixing, striking adobe, extrudes, vertically draw, the horizontal operation of drawing, and it is characterized in that: the die head that adopts flat pattern mouth mould in extruding operation; Extruding and vertical drawing increased calendering operation together between the operation.With respect to conventional P TFE sealing material, expanded PTFE and filling-modified PTFE sealing material, foaming modification PTFE sealing material has more excellent creep resistance relaxation property and obtains higher bolt torque conservation rate and better long term seal effect, the research of PTFE foaming modification, domesticly do not see that as yet research report and series product are arranged, the external GYLON S-3545 micropore ptfe composite of mainly releasing with U.S. Garlock company is representative, this manufacturing technology has not only kept PTFE inherent chemically-resistant characteristic, creep and the cold flow phenomenon of general PTFE have been reduced simultaneously greatly, but its complex manufacturing technology, cost is higher.
Summary of the invention
At the defective that above-mentioned existing conventional P TFE, expanded PTFE, filling-modified PTFE and foaming modification PTFE sealing material exist, main purpose of the present invention just provides a kind of have down fabulous creep resistance relaxation property, better long term seal effect, long work-ing life, simple manufacture craft and foaming modification micropore PTFE sealing material with low cost and preparation method thereof.
Micropore polyfluortetraethyleseal seal plate of the present invention is to be formed through foaming modification by teflon resin, and wherein teflon resin accounts for 50%～90% of total mass, and all the other are whipping agent; The preferably polytetrafluoroethylene resin accounts for 55%～75% of total mass, and all the other are whipping agent; Described teflon resin is the suspending resin of particle diameter 2～500 μ m; Described whipping agent is sodium bicarbonate, Sodium Nitrite, ammonium chloride, blowing agent AC (C
5H
10N
6O
2) and blowing agent H (C
5H
10N
6O
2) in any.
The preparation method of micropore polyfluortetraethyleseal seal plate of the present invention comprises following concrete steps:
(1) pre-treatment is descended the teflon resin of choosing dry 1～1.5 hour at 100 ± 2 ℃, and the blowing agent powder of choosing is broken into particle diameter less than 60 orders;
(2) mix and to mix through pretreated teflon resin and whipping agent;
(3) raw material after mold pressing will mix, compression molding in mould, forming pressure is 20～35MPa;
(4) the dry resin plate that takes out compression moulding is in the placement 2～5 hours down of 80 ± 10 ℃, the environment of humidity 60～80%;
(5) high temperature sintering carries out high temperature sintering with the resin plate of compression moulding, and sintering temperature is controlled at 375 ± 5 ℃, and the heat preservation sintering time is 1～2 hour;
(6) cooling treat goods sinter to full impregnated bright after, slowly be cooled to 250 ℃ per hour to descend 50 ℃, can with stove freely cool off the acquisition required micropore polyfluortetraethyleseal seal plate.
Compression molding pressure in the step (3) is preferably 25～35MPa.
Compared with prior art, micropore polyfluortetraethyleseal seal plate of the present invention has chemically-resistant characteristic and the heat resistance identical with pure PTFE, higher compression recovery performance, excellent creep resistance relaxation property and long term seal performance, conventional P TFE be can extensively substitute, PTFE and varicosity PTFE sealing material filled, be specially adapted to plastics and fiber reinforced plastic pipe and equipment, high corrosion operating mode is to the requirement of sealing.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Embodiment
Embodiment 1
The preparation method of the micropore polyfluortetraethyleseal seal plate of present embodiment comprises following concrete steps:
(1) 65 parts of particle diameters of pre-treatment weighing polytetrafluoroethylsuspending suspending resin that is 2 μ m 100 ± 2 ℃ dry 1～1.5 hour down; Blowing agent AC (the C that weighing is 35 parts
5H
10N
6O
2), be ground into particle diameter＜60 orders;
(2) mixing will be through pretreated teflon resin and blowing agent AC (C
5H
10N
6O
2) mix;
(3) raw material after mold pressing will mix, compression molding in mould, forming pressure is 20MPa;
(4) the dry resin plate that takes out compression moulding is in the placement 2～5 hours down of 85 ± 5 ℃, the environment of humidity 60～80%;
(5) high temperature sintering carries out high temperature sintering with the resin plate of compression moulding, and sintering temperature is controlled at 375 ± 5 ℃, and the heat preservation sintering time is 1～2 hour;
(6) cooling treat goods sinter to full impregnated bright after, slowly be cooled to 250 ℃ per hour to descend 50 ℃, can with stove freely cool off the acquisition required micropore polyfluortetraethyleseal seal plate.
Embodiment 2
The difference of present embodiment and embodiment 1 is: following dry 1～1.5 hour at 100 ± 2 ℃ at the polytetrafluoroethylsuspending suspending resin that 50 parts of particle diameters of step (1) weighing are 2 μ m; Blowing agent AC (the C that weighing is 50 parts
5H
10N
6O
2), be ground into particle diameter＜60 orders.
All the other contents are all with identical described in the embodiment 1.
Embodiment 3
The difference of present embodiment and embodiment 1 is: following dry 1～1.5 hour at 100 ± 2 ℃ at the polytetrafluoroethylsuspending suspending resin that 55 parts of particle diameters of step (1) weighing are 2 μ m; Blowing agent AC (the C that weighing is 45 parts
5H
10N
6O
2), be ground into particle diameter＜60 orders.
All the other contents are all with identical described in the embodiment 1.
Embodiment 4
The difference of present embodiment and embodiment 1 is: following dry 1～1.5 hour at 100 ± 2 ℃ at the polytetrafluoroethylsuspending suspending resin that 75 parts of particle diameters of step (1) weighing are 2 μ m; Blowing agent AC (the C that weighing is 25 parts
5H
10N
6O
2), be ground into particle diameter＜60 orders.
All the other contents are all with identical described in the embodiment 1.
Embodiment 5
The difference of present embodiment and embodiment 1 is: following dry 1～1.5 hour at 100 ± 2 ℃ at the polytetrafluoroethylsuspending suspending resin that 90 parts of particle diameters of step (1) weighing are 2 μ m; Blowing agent AC (the C that weighing is 10 parts
5H
10N
6O
2), be ground into particle diameter＜60 orders.
All the other contents are all with identical described in the embodiment 1.
Embodiment 6
The difference of present embodiment and embodiment 1 is: used whipping agent is a sodium bicarbonate.
All the other contents are all with identical described in the embodiment 1.
Embodiment 7
The difference of present embodiment and embodiment 1 is: used whipping agent is a Sodium Nitrite.
All the other contents are all with identical described in the embodiment 1.
Embodiment 8
The difference of present embodiment and embodiment 1 is: used whipping agent is an ammonium chloride.
All the other contents are all with identical described in the embodiment 1.
Embodiment 9
The difference of present embodiment and embodiment 1 is: used whipping agent is blowing agent H (C
5H
10N
6O
2).
All the other contents are all with identical described in the embodiment 1.
Embodiment 10
The difference of present embodiment and embodiment 1 is: the particle diameter of used polytetrafluoroethylsuspending suspending resin is 10 μ m.
All the other contents are all with identical described in the embodiment 1.
Embodiment 11
The difference of present embodiment and embodiment 1 is: the particle diameter of used polytetrafluoroethylsuspending suspending resin is 300 μ m.
All the other contents are all with identical described in the embodiment 1.
Embodiment 12
The difference of present embodiment and embodiment 1 is: the particle diameter of used polytetrafluoroethylsuspending suspending resin is 400 μ m.
All the other contents are all with identical described in the embodiment 1.
Embodiment 13
The difference of present embodiment and embodiment 1 is: the particle diameter of used polytetrafluoroethylsuspending suspending resin is 500 μ m.
All the other contents are all with identical described in the embodiment 1.
Embodiment 14
The difference of present embodiment and embodiment 1 is: the forming pressure in the step (3) is 25MPa.
All the other contents are all with identical described in the embodiment 1.
Embodiment 15
The difference of present embodiment and embodiment 1 is: the forming pressure in the step (3) is 30MPa.
All the other contents are all with identical described in the embodiment 1.
Embodiment 16
The difference of present embodiment and embodiment 1 is: the forming pressure in the step (3) is 35MPa.
All the other contents are all with identical described in the embodiment 1.
The performance of micropore PTFE sealing material that the present invention is prepared and common PTFE, varicosity PTFE and filling-modified PTFE relatively is shown in Table 1:
The performance test of table 1 micropore PTFE sealing material
1. common PTFE data are taken from 7010 of Japanese Wal card company;
2. varicosity PTFE data are taken from the varicosity slab-like mats of U.S. Gore;
3. filling-modified PTFE data are taken from the GYLON3504 of U.S. Garlock company.
By table 1 as seen: micropore polyfluortetraethyleseal seal plate of the present invention has chemically-resistant characteristic and the heat resistance identical with pure PTFE, higher compression recovery performance, excellent creep resistance relaxation property and long term seal performance, conventional P TFE be can extensively substitute, PTFE and varicosity PTFE sealing material filled, be specially adapted to plastics and fiber reinforced plastic pipe and equipment, high corrosion operating mode is to the requirement of sealing.
Claims (6)
1. micropore polyfluortetraethyleseal seal plate is characterized in that: formed through foaming modification by teflon resin, wherein teflon resin accounts for 50%～90% of total mass, and all the other are whipping agent.
2. micropore polyfluortetraethyleseal seal plate according to claim 1 is characterized in that: teflon resin accounts for 55%～75% of total mass, and all the other are whipping agent.
3. micropore polyfluortetraethyleseal seal plate according to claim 1 and 2 is characterized in that: described teflon resin is the suspending resin of particle diameter 2～500 μ m.
4. micropore polyfluortetraethyleseal seal plate according to claim 1 and 2 is characterized in that: described whipping agent is sodium bicarbonate, Sodium Nitrite, ammonium chloride, blowing agent AC (C
5H
10N
6O
2) and blowing agent H (C
5H
10N
6O
2) in any one.
5. the preparation method of the described micropore polyfluortetraethyleseal seal plate of claim 1 is characterized in that, comprises following concrete steps:
(1) pre-treatment is descended the teflon resin of choosing dry 1～1.5 hour at 100 ± 2 ℃, and the blowing agent powder of choosing is broken into particle diameter less than 60 orders;
(2) mix and to mix through pretreated teflon resin and whipping agent;
(3) raw material after mold pressing will mix, compression molding in mould, forming pressure is 20～35MPa;
(4) the dry resin plate that takes out compression moulding is in the placement 2～5 hours down of 80 ± 10 ℃, the environment of humidity 60～80%;
(5) high temperature sintering carries out high temperature sintering with the resin plate of compression moulding, and sintering temperature is controlled at 375 ± 5 ℃, and the heat preservation sintering time is 1～2 hour;
(6) cooling treat goods sinter to full impregnated bright after, slowly be cooled to 250 ℃ per hour to descend 50 ℃, can with stove freely cool off the acquisition required micropore polyfluortetraethyleseal seal plate.
6. the preparation method of micropore polyfluortetraethyleseal seal plate according to claim 5, it is characterized in that: the compression molding pressure in the step (3) is 25～35MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100546289A CN101608042A (en) | 2009-07-10 | 2009-07-10 | Micropore polyfluortetraethyleseal seal plate and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100546289A CN101608042A (en) | 2009-07-10 | 2009-07-10 | Micropore polyfluortetraethyleseal seal plate and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101608042A true CN101608042A (en) | 2009-12-23 |
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|---|---|---|---|
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102700041A (en) * | 2012-04-27 | 2012-10-03 | 朱树烽 | Manufacturing method of polytetrafluoroethylene orifice-plate corrugated packing |
| CN109369151A (en) * | 2018-11-15 | 2019-02-22 | 浠ｅ浆 | A kind of inorganic composite materials and preparation method thereof of the resistance to punching mill of waterwork |
| CN109501424A (en) * | 2018-12-26 | 2019-03-22 | 江苏金由新材料有限公司 | A kind of PTFE composite sealing pad and its preparation process |
| CN109627652A (en) * | 2018-12-26 | 2019-04-16 | 江苏金由新材料有限公司 | A kind of preparation process of PTFE foamed board |
| CN109664585A (en) * | 2018-12-26 | 2019-04-23 | 江苏金由新材料有限公司 | A kind of PTFE compound seal backing plate and its preparation process |
| CN113059822A (en) * | 2021-03-18 | 2021-07-02 | 成都希瑞方晓科技有限公司 | Preparation method of expanded polytetrafluoroethylene with enhanced creep resistance |
| CN114196060A (en) * | 2021-12-15 | 2022-03-18 | 宁夏大学 | Porous polytetrafluoroethylene sponge material and preparation method thereof |
-
2009
- 2009-07-10 CN CNA2009100546289A patent/CN101608042A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102700041A (en) * | 2012-04-27 | 2012-10-03 | 朱树烽 | Manufacturing method of polytetrafluoroethylene orifice-plate corrugated packing |
| CN109369151A (en) * | 2018-11-15 | 2019-02-22 | 浠ｅ浆 | A kind of inorganic composite materials and preparation method thereof of the resistance to punching mill of waterwork |
| CN109501424A (en) * | 2018-12-26 | 2019-03-22 | 江苏金由新材料有限公司 | A kind of PTFE composite sealing pad and its preparation process |
| CN109627652A (en) * | 2018-12-26 | 2019-04-16 | 江苏金由新材料有限公司 | A kind of preparation process of PTFE foamed board |
| CN109664585A (en) * | 2018-12-26 | 2019-04-23 | 江苏金由新材料有限公司 | A kind of PTFE compound seal backing plate and its preparation process |
| CN109501424B (en) * | 2018-12-26 | 2023-09-12 | 江苏金由新材料有限公司 | PTFE composite sealing gasket and preparation process thereof |
| CN113059822A (en) * | 2021-03-18 | 2021-07-02 | 成都希瑞方晓科技有限公司 | Preparation method of expanded polytetrafluoroethylene with enhanced creep resistance |
| CN114196060A (en) * | 2021-12-15 | 2022-03-18 | 宁夏大学 | Porous polytetrafluoroethylene sponge material and preparation method thereof |
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Open date: 20091223 |