CN106273151A - A kind of polytrifluorochloroethylene die pressing method - Google Patents
A kind of polytrifluorochloroethylene die pressing method Download PDFInfo
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- CN106273151A CN106273151A CN201510249691.3A CN201510249691A CN106273151A CN 106273151 A CN106273151 A CN 106273151A CN 201510249691 A CN201510249691 A CN 201510249691A CN 106273151 A CN106273151 A CN 106273151A
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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 die pressing method.The polytrifluorochloroethylene die pressing method of the present invention, comprises the following steps: polytrifluorochloroethylene raw material is put into mold cavity by (1)；(2) heating；(3) molding；(4) cool the temperature to 60 DEG C～80 DEG C, and in temperature-fall period, be always maintained at 30～36MPa/cm2Pressure is 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 and mold processing side
Method.
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 die pressing method, it comprises the following steps:
(1) polytrifluorochloroethylene raw material is put into mold cavity；
(2) heating；
(3) molding；
(4) cool the temperature to 60 DEG C～80 DEG C, and be always maintained in temperature-fall period 30～
36MPa/cm2Pressure is to the demoulding.During numerous olefin plastics product moldings, for shortening molding week
Phase, accelerating rate of cooling, often using air-cooled or water-cooled to reach to improve effect is a kind of common cooling
Process, and can guarantee that product quality and products machinery performance, and polytrifluorochloroethylene cooling and shaping
During, during often fast because of rate of cooling or cooling, temperature is uneven, and the temperature difference is more than more than 20 DEG C, meeting
Cause article section color and luster inconsistent or product aberration everywhere is big, thermal stress-cracking time serious, can be caused.
It has been investigated that: goods are colded pressing when shaping, and keep pressure 30～36MPa/cm2, when mould temperature reaches
When 60～80 DEG C, mould unloading takes out goods, can overcome goods thermal stress, it is thus achieved that indehiscent qualified products.
Another preferred version is, described step (2) is heated to be and is heated to 240 DEG C～280 DEG C, by producing
Product thickness keep should at a temperature of 6～14min/mm.Further study show that, can under this temperature and time
With the resolution ratio that holding polytrifluorochloroethylene is minimum, the finished product after molding does not has cracking phenomena simultaneously, protects
Demonstrate,prove the color and luster of goods and avoided cracking.
Another preferred version is, described step (3) forming process keeps unit briquetting pressure 30～
36MPa/cm2.It has been investigated that, use this pressure, can overcome molecularly oriented and the crystallization that produces with
Crystalline stress, thus avoid goods to ftracture.
It is highly preferred that described step (2) press product thickness keep should at a temperature of 8～12min/mm.
It is highly preferred that described step (4) is always maintained at pressure 30～36MPa/cm in temperature-fall period2。
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 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.
Another preferred version, first cleans processing mold with ethanol, then with silicones and diluent with
The glue coating profile of volume ratio 20～40:60～80 proportioning composition, and through 240～290 DEG C of temperature
Baking, is incubated 1.5～3 hours, makes film layer fully solidify.
Polytrifluorochloroethylene (PCTFE) is during adding, and when PCTFE material hot melt melts, adhesion is relatively strong,
After sizing, demoulding difficulty is big (sticking to mould), it has been investigated that, use said method, after film layer solidifies,
Form the silicone resin film of layer of transparent, solve the problem that the demoulding is difficult well.
Mould is carried out in pretreatment, silicones and diluent preferably with volume ratio be 28～35:65～
72 mixing, more preferably silicones preferably mixes with volume ratio for 30:70 with diluent.Under this ratio,
Can rapid film formation, and be easier to removing, the former can make the process time reduce 8～10 minutes, and
During best proportion, the process time can be made to reduce 10～15 minutes, and remove cleaner, having reduced will
The time of mould scrub again.
Carrying out mould in pretreatment, baking temperature is preferably 260～270 DEG C.At a temperature of Gai, film forming
Quality is more stable, and does not has the phenomenon bubbled.
Carrying out mould in pretreatment, temperature retention time is preferably 2 hours.
Further, the preferred toluene of described diluent.Use toluene as diluent, can reach
Cost degradation.
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 die pressing method, 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) cool the temperature to 70 DEG C, temperature-fall period is always maintained at pressure 30～36MPa/cm2,
The demoulding.
Embodiment 2
A kind of polytrifluorochloroethylene die pressing method, 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) cool the temperature to 80 DEG C, temperature-fall period is always maintained at pressure 30～36MPa/cm2,
The demoulding.
Embodiment 3
A kind of polytrifluorochloroethylene die pressing method, step is as follows:
(1) prepare mould according to article shape to be processed, first with ethanol, mould is cleaned, then use
The glue coating profile that silicones forms with volume ratio 30:70 proportioning with toluene, and through 280 DEG C of temperature
Baking, is incubated 1.5 hours, makes film layer fully solidify.Polytrifluorochloroethylene raw material is put into mould type
Chamber；
(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) cool the temperature to 65 DEG C, temperature-fall period is always maintained at pressure 30～36MPa/cm2,
The demoulding.
Embodiment 4
A kind of polytrifluorochloroethylene die pressing method, step is as follows:
(1) press machining shape and prepare corresponding pattern, first with ethanol, mould is cleaned, then with silicon tree
The glue coating profile that fat forms with volume ratio 40:60 proportioning with toluene, and toast through 255 DEG C of temperature,
It is incubated 3 hours, makes film layer fully solidify, then 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) cool the temperature to 60 DEG C, temperature-fall period is always maintained at pressure 32～34MPa/cm2,
The demoulding.
Embodiment 5
A kind of polytrifluorochloroethylene die pressing method, step is as follows:
(1) press machining shape and prepare corresponding pattern, first with ethanol, mould is cleaned, then use silicones
The glue coating profile formed with volume ratio 25:75 proportioning with dimethylbenzene, and toast through 240 DEG C of temperature,
It is incubated 3 hours, makes film layer fully solidify, then 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) cool the temperature to 80 DEG C, temperature-fall period is always maintained at pressure 31～33MPa/cm2,
The demoulding.
Embodiment 6
A kind of polytrifluorochloroethylene die pressing method, step is as follows:
(1) it is prepared to mould, the most first with ethanol, mould is cleaned, then with silicones and acetone
With the glue coating profile of volume ratio 20:80 proportioning composition, and toast through 240 DEG C of temperature, be incubated 3
Hour, make film layer fully solidify, then 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) cool the temperature to 72 DEG C, temperature-fall period is always maintained at pressure 30～36MPa/cm2,
The demoulding.
Embodiment 7
A kind of polytrifluorochloroethylene die pressing method, step is as follows:
(1) mould is carried out pretreatment: first cleaned by mould with ethanol, then with silicones with
The glue coating profile that n-butyl alcohol forms with volume ratio 33:67 proportioning, and toast through 260 DEG C of temperature,
It is incubated 2.5 hours, makes film layer fully solidify, then 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) cool the temperature to 80 DEG C, temperature-fall period is always maintained at pressure 30～35MPa/cm2,
The demoulding.
Embodiment 8
A kind of polytrifluorochloroethylene die pressing method, step is as follows:
(1) mould is carried out pretreatment: first cleaned by mould with ethanol, then with silicones with
The glue coating profile that n-butyl alcohol forms with volume ratio 36:64 proportioning, and toast through 245 DEG C of temperature,
It is incubated 2.5 hours, makes film layer fully solidify, then 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) cool the temperature to 63 DEG C, temperature-fall period is always maintained at pressure 30～36MPa/cm2,
The demoulding.
Embodiment 9
A kind of polytrifluorochloroethylene die pressing method, step is as follows:
(1) mould is carried out pretreatment: first cleaned by mould with ethanol, then with silicones with
The glue coating profile that toluene forms with volume ratio 30:70 proportioning, and toast through 267 DEG C of temperature, protect
Temperature 2.5 hours, makes film layer fully solidify, then 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) cool the temperature to 70 DEG C, temperature-fall period is always maintained at pressure 30～36MPa/cm2,
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.
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 die pressing method, is characterized in that, comprises the following steps:
(1) polytrifluorochloroethylene raw material is put into mold cavity；
(2) heating；
(3) molding；
(4) cool the temperature to 60 DEG C～80 DEG C, and be always maintained in temperature-fall period 30～
36MPa/cm2Pressure is to the demoulding.
The most according to claim 1, polytrifluorochloroethylene die pressing method, is characterized in that,
Described step (2) is heated to be and is heated to 240 DEG C～280 DEG C, at a temperature of keeping being somebody's turn to do by product thickness
6～14min/mm.
The most according to claim 1, polytrifluorochloroethylene die pressing method, is characterized in that,
Keep unit briquetting pressure 30～36MPa/cm during described step (3) molding2。
The most according to claim 1, polytrifluorochloroethylene die pressing method, is characterized in that,
Described step (2) press product thickness keep should at a temperature of 8～12min/mm.
The most according to claim 1, polytrifluorochloroethylene die pressing method, is characterized in that,
Described step (4) is always maintained at pressure 30～36MPa/cm in temperature-fall period2。
The most according to claim 1, polytrifluorochloroethylene die pressing method, is characterized in that,
Before polytrifluorochloroethylene raw material is put into mold cavity, also mould is carried out pretreatment, described pre-
Process comprises the following steps: first cleaned by processing mold with ethanol, then with silicones and diluent
With the glue coating profile of volume ratio 20～40:60～80 proportioning composition, and through 240～290 DEG C
Temperature is toasted, and is incubated 1.5～3 hours, makes film layer fully solidify.
The most according to claim 6, polytrifluorochloroethylene die pressing method, is characterized in that,
Described diluent is toluene.
The most according to claim 6, polytrifluorochloroethylene die pressing method, is characterized in that,
Silicones and diluent are 28～35:65～72 to mix with volume ratio.
The most according to claim 8, polytrifluorochloroethylene die pressing method, is characterized in that,
Silicones mixes for 30:70 with volume ratio with diluent.
The most according to claim 1, polytrifluorochloroethylene die pressing method, is characterized in that,
In preprocessing process, baking temperature is 260～270 DEG C.
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| CN201510249691.3A CN106273151A (en) | 2015-05-15 | 2015-05-15 | A kind of polytrifluorochloroethylene die pressing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114800993A (en) * | 2022-04-19 | 2022-07-29 | 株洲宏大高分子材料有限公司 | Horizontal bidirectional pushing forming method and device for polychlorotrifluoroethylene bars |
-
2015
- 2015-05-15 CN CN201510249691.3A patent/CN106273151A/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 |
|---|---|---|---|---|
| CN114800993A (en) * | 2022-04-19 | 2022-07-29 | 株洲宏大高分子材料有限公司 | Horizontal bidirectional pushing forming method and device for polychlorotrifluoroethylene bars |
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Application publication date: 20170104 |