CN106273150A - A kind of polytrifluorochloroethylene goods die press technology for forming - Google Patents
A kind of polytrifluorochloroethylene goods die press technology for forming Download PDFInfo
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- CN106273150A CN106273150A CN201510248717.2A CN201510248717A CN106273150A CN 106273150 A CN106273150 A CN 106273150A CN 201510248717 A CN201510248717 A CN 201510248717A CN 106273150 A CN106273150 A CN 106273150A
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- polytrifluorochloroethylene
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Abstract
The present invention relates to processing of high molecular material, be specifically related to a kind of polytrifluorochloroethylene goods die press technology for forming.One polytrifluorochloroethylene goods die press technology for forming of the present invention, comprises the following steps: polytrifluorochloroethylene raw material is put into mold cavity by (1)；(2) be heated to 240 DEG C～280 DEG C, by product thickness keep should at a temperature of 6～14min/mm；(3) molding, keeps unit briquetting pressure 30～36MPa/cm2；(4) 60 DEG C～80 DEG C are cooled the temperature to, the demoulding.The method of the present invention can efficiently solve the problem that in existing polytrifluorochloroethylene goods die press technology for forming, product easily ftractures.
Description
Technical field
The present invention relates to processing of high molecular material, be specifically related to a kind of polytrifluorochloroethylene goods and be molded into
Type technique.
Background technology
Polytrifluorochloroethylene (PCTFE) is the thermoplastic fluoroelastomer plastics researching and developing the earliest and producing, its point
Son is measured 100,000～200,000, extrudate density 2.12～2.18g/cm3.Fluorine atom in molecular structure makes
Polymer has chemical inertness, certain temperature tolerance, non-hygroscopic and air impermeability.Molecular structure
Chlorine atom exists, and makes polymer have good processing fluidity, the transparency and hardness property.Poly-three
Fluorine vinyl chloride goods not only possess fluororesin anti-corrosive properties, have optimal lower temperature resistance simultaneously, though long
Phase is in-200 DEG C of low temperature environments the most severe, remains to have the mechanical strength that material behavior is possessed,
It it is one of kind the most cold-resistant in nonmetallic materials.It is widely used in liquid oxygen, liquid nitrogen liquid delivery tube
Valve seal in road and the military project leading-edge field low temperature seal occasion such as space flight, aviation, navigation, be one
Plant and be difficult to the low temperature seal goods obtained more.
As far back as the 60 to 70's of last century, industry prosperity and the western countries of advanced technology, begin to
Polytrifluorochloroethylene goods are developed and applied, but the processing of goods made by polytrifluorochloroethylene raw material
During, it is very easy to decompose and finished product cracking, and also there is the problem that the demoulding is difficult, because poly-three
Fluorine vinyl chloride is different from politef, melt-flowable of being heated, even if in molten condition, and its viscosity
The biggest (500000～5000000Pa/s), fluidity of molten is little, and forming temperature is difficult to grasp.
Thus during compression molding, the goods that cannot solve often to occur are because molecular crystalline stress is with cold always
The most irregular thermal stress-cracking and be difficult to the technical bottlenecks such as the demoulding and process difficulties, accordingly, it is difficult to will
Polytrifluorochloroethylene compression molding is high-quality plate, rod or tubing, significantly constrains poly-trifluoro chloroethene
The application of alkene.
Summary of the invention
Present invention aim to address that in existing polytrifluorochloroethylene processing technique, goods are because of molecular crystalline
The problem that stress causes cracking with the irregular thermal stress of cooling.The present invention solves the scheme of the problems referred to above,
A kind of polytrifluorochloroethylene goods die press technology for forming, it comprises the following steps:
(1) polytrifluorochloroethylene raw material is put into mold cavity；
(2) be heated to 240 DEG C～280 DEG C, by product thickness keep should at a temperature of 6～14min/mm；
(3) molding, keeps unit briquetting pressure 30～36MPa/cm2；
(4) 60 DEG C～80 DEG C are cooled the temperature to, the demoulding.
Described step (2) is preferably heated to 240～280 DEG C.It has been investigated that, permissible at a temperature of being somebody's turn to do
Keeping the resolution ratio that polytrifluorochloroethylene is minimum, the finished product after molding does not has cracking phenomena simultaneously.
Described step (2) keeps the time of this temperature to be preferably 6～14min/mm according to product thickness.
Described step (3) forming process keep unit briquetting pressure 30～36MPa/cm2.Through grinding
Study carefully discovery, use this pressure, molecularly oriented can be overcome and the crystallization that produces and crystalline stress, thus
Goods are avoided to ftracture.
Another preferred version, described step (2) is heated to 250 DEG C～270 DEG C.More preferably, described
Step (2) is heated to 255 DEG C～260 DEG C.
Another preferred version, described step (2) press product thickness keep should at a temperature of 8～12min/mm.
More preferably, described step (2) press product thickness keep should at a temperature of 9～10min/mm.
Another preferred version, described step (3) molding keeps unit briquetting pressure 32～
35MPa/cm2.More preferably, described step (3) molding keeps unit briquetting pressure 33～
34MPa/cm2。
Another preferred version, described step (4) cools the temperature to 65 DEG C～75 DEG C, the demoulding.More preferably
Ground, described step (4) cools the temperature to 68 DEG C～72 DEG C, the demoulding.Most preferably, described step (4)
Cool the temperature to 69 DEG C～71 DEG C, the demoulding.
The present invention, by a set of polytrifluorochloroethylene processing technique newly found out, have adjusted temperature and pressure
The design of power, and also before the forming mould can be carried out pretreatment, both avoided asking of goods cracking
Topic, has reached again the effect of the easy demoulding, has had the most wide prospects for commercial application.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described, to help being more fully understood that this
Bright, but protection scope of the present invention is not limited in these embodiments.
Embodiment 1
A kind of polytrifluorochloroethylene goods die press technology for forming, step is as follows:
(1) polytrifluorochloroethylene raw material is put into mold cavity；
(2) polytrifluorochloroethylene is heated to 280 DEG C, 6min/mm at a temperature of keeping being somebody's turn to do；
(3) molding, keeps unit briquetting pressure at 35MPa/cm2；
(4) 70 DEG C are cooled the temperature to, the demoulding.
Embodiment 2
A kind of polytrifluorochloroethylene goods die press technology for forming, step is as follows:
(1) polytrifluorochloroethylene raw material is put into mold cavity；
(2) 280 DEG C it are heated to, 7min/mm at a temperature of keeping being somebody's turn to do；
(3) molding, keeps unit briquetting pressure at 33MPa/cm2；
(4) 80 DEG C are cooled the temperature to, the demoulding.
Embodiment 3
A kind of polytrifluorochloroethylene goods die press technology for forming, step is as follows:
(1) polytrifluorochloroethylene raw material is put into mold cavity；
(2) 280 DEG C it are heated to, 8min/mm at a temperature of keeping being somebody's turn to do；
(3) molding, keeps unit briquetting pressure at 30MPa/cm2；
(4) 65 DEG C are cooled the temperature to, the demoulding.
Embodiment 4
A kind of polytrifluorochloroethylene goods die press technology for forming, step is as follows:
(1) polytrifluorochloroethylene raw material is put into mold cavity；
(2) 270 DEG C it are heated to, 8min/mm at a temperature of keeping being somebody's turn to do；
(3) molding, keeps unit briquetting pressure at 36MPa/cm2；
(4) 60 DEG C are cooled the temperature to, the demoulding.
Embodiment 5
A kind of polytrifluorochloroethylene goods die press technology for forming, step is as follows:
(1) polytrifluorochloroethylene raw material is put into mold cavity；
(2) 270 DEG C it are heated to, 9min/mm at a temperature of keeping being somebody's turn to do；
(3) molding, keeps unit briquetting pressure at 33MPa/cm2；
(4) 80 DEG C are cooled the temperature to, the demoulding.
Embodiment 6
A kind of polytrifluorochloroethylene goods die press technology for forming, step is as follows:
(1) polytrifluorochloroethylene raw material is put into mold cavity；
(2) 270 DEG C it are heated to, 10min/mm at a temperature of keeping being somebody's turn to do；
(3) molding, keeps unit briquetting pressure at 30MPa/cm2；
(4) 72 DEG C are cooled the temperature to, the demoulding.
Embodiment 7
A kind of polytrifluorochloroethylene goods die press technology for forming, step is as follows:
(1) polytrifluorochloroethylene raw material is put into mold cavity；
(2) 240 DEG C it are heated to, 10min/mm at a temperature of keeping being somebody's turn to do；
(3) molding, keeps unit briquetting pressure at 33MPa/cm2；
(4) 80 DEG C are cooled the temperature to, the demoulding.
Embodiment 8
A kind of polytrifluorochloroethylene goods die press technology for forming, step is as follows:
(1) polytrifluorochloroethylene raw material is put into mold cavity；
(2) 240 DEG C it are heated to, 12min/mm at a temperature of keeping being somebody's turn to do；
(3) molding, keeps unit briquetting pressure at 33MPa/cm2；
(4) 63 DEG C are cooled the temperature to, the demoulding.
Embodiment 9
A kind of polytrifluorochloroethylene goods die press technology for forming, step is as follows:
(1) polytrifluorochloroethylene raw material is put into mold cavity；
(2) 240 DEG C it are heated to, 14min/mm at a temperature of keeping being somebody's turn to do；
(3) molding, keeps unit briquetting pressure at 30MPa/cm2；
(4) 70 DEG C are cooled the temperature to, the demoulding.
The product of embodiment 1～9 molding after testing, all plastifies uniformly, is cut through Physical Processing by goods
Cut and the most do not ftracture, simultaneously in preparation process can the quickly demoulding, substantially reduce the demoulding time, carry
High production efficiency.
For the preferably demoulding, embodiment 1～9, before preparation, also can carry out pretreatment to mould,
Pretreating process is: for polytrifluorochloroethylene (PCTFE) material behavior, it has been investigated that heat fusing
Time adhesion relatively strong, thus after easily making sizing, demoulding difficulty is big (sticking to mould), carries out mould before use
Pretreating process can assisted ejection: first cleans with ethanol cloth, then selects silicones (toluene is diluent)
Coat profile by 30:70 proportioning glue, and toast through 240～290 DEG C of temperature, be incubated 2 hours,
Make film layer fully solidify, form the silicone resin film of layer of transparent, the problem that the demoulding is difficult can be solved.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by upper
Stating the restriction of embodiment, that is made under other any spirit without departing from the present invention and principle changes
Become, modify, substitute, combine, simplify, all should be the substitute mode of equivalence, be included in the present invention
Protection domain within.
Claims (10)
1. a polytrifluorochloroethylene goods die press technology for forming, is characterized in that, comprises the following steps:
(1) polytrifluorochloroethylene raw material is put into mold cavity；
(2) be heated to 240 DEG C～280 DEG C, by product thickness keep should at a temperature of 6～
14min/mm；
(3) molding, keeps unit briquetting pressure 30～36MPa/cm2；
(4) 60 DEG C～80 DEG C are cooled the temperature to, the demoulding.
The most according to claim 1, polytrifluorochloroethylene goods die press technology for forming, is characterized in that,
Described step (2) is heated to 250 DEG C～270 DEG C.
The most according to claim 2, polytrifluorochloroethylene goods die press technology for forming, is characterized in that,
Described step (2) is heated to 255 DEG C～260 DEG C.
The most according to claim 1, polytrifluorochloroethylene goods die press technology for forming, is characterized in that,
Described step (2) press product thickness keep should at a temperature of 8～12min/mm.
The most according to claim 4, polytrifluorochloroethylene goods die press technology for forming, is characterized in that,
Described step (2) press product thickness keep should at a temperature of 9～10min/mm.
The most according to claim 1, polytrifluorochloroethylene goods die press technology for forming, is characterized in that,
Described step (3) molding keep unit briquetting pressure 32～35MPa/cm2。
The most according to claim 6, polytrifluorochloroethylene goods die press technology for forming, is characterized in that,
Described step (3) molding keep unit briquetting pressure 33～34MPa/cm2。
8. mold according to polytrifluorochloroethylene goods described in claim 1 to 7 any one claim
Moulding process, is characterized in that, described step (4) cools the temperature to 65 DEG C～75 DEG C, the demoulding.
9. mold according to polytrifluorochloroethylene goods described in claim 1 to 7 any one claim
Moulding process, is characterized in that, described step (4) cools the temperature to 68 DEG C～72 DEG C, the demoulding.
10. according to polytrifluorochloroethylene goods mould described in claim 1 to 7 any one claim
Molded technique, is characterized in that, described step (4) cools the temperature to 69 DEG C～71 DEG C, the demoulding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510248717.2A CN106273150A (en) | 2015-05-15 | 2015-05-15 | A kind of polytrifluorochloroethylene goods die press technology for forming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510248717.2A CN106273150A (en) | 2015-05-15 | 2015-05-15 | A kind of polytrifluorochloroethylene goods die press technology for forming |
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|---|---|
| CN106273150A true CN106273150A (en) | 2017-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201510248717.2A Pending CN106273150A (en) | 2015-05-15 | 2015-05-15 | A kind of polytrifluorochloroethylene goods die press technology for forming |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114261048A (en) * | 2021-12-28 | 2022-04-01 | 成都双高实业有限责任公司 | Intermediate-frequency heating process and heating equipment for polytrifluorochloroethylene thermoforming |
-
2015
- 2015-05-15 CN CN201510248717.2A patent/CN106273150A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| 孙生钧: ""聚三氟氯乙烯加工工艺探讨"", 《塑料科技》 * |
| 胡浚: "《塑料压制成型》", 31 May 2005, 化学工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114261048A (en) * | 2021-12-28 | 2022-04-01 | 成都双高实业有限责任公司 | Intermediate-frequency heating process and heating equipment for polytrifluorochloroethylene thermoforming |
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Application publication date: 20170104 |