CN105643856B - The method of testing of exhaustive fluorinated ethylene propylene molding shrinkage - Google Patents
The method of testing of exhaustive fluorinated ethylene propylene molding shrinkage Download PDFInfo
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- CN105643856B CN105643856B CN201511029269.3A CN201511029269A CN105643856B CN 105643856 B CN105643856 B CN 105643856B CN 201511029269 A CN201511029269 A CN 201511029269A CN 105643856 B CN105643856 B CN 105643856B
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- ethylene propylene
- fluorinated ethylene
- testing
- mould
- exhaustive fluorinated
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/44—Resins; rubber; leather
- G01N33/442—Resins, plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
- B29C2043/5816—Measuring, controlling or regulating temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
- B29C2043/5825—Measuring, controlling or regulating dimensions or shape, e.g. size, thickness
Abstract
The present invention relates to a kind of method of testing of exhaustive fluorinated ethylene propylene molding shrinkage, belong to plastic sheeting technical field of measurement and test.The method of testing of exhaustive fluorinated ethylene propylene molding shrinkage of the present invention, it is that exhaustive fluorinated ethylene propylene is molded using compression molding method, thermometer hole and ply bar scot are provided with come shrinkage from mold dimensions, mould therefor by specimen length after cavity length and shaping.Cost of the present invention is low, and simple, intuitive is easy, and measurement result accuracy is high, and data reference is provided for perfluoroethylene-propylene following process use, has directive significance to production.
Description
Technical field
The present invention relates to a kind of method of testing of exhaustive fluorinated ethylene propylene molding shrinkage, belongs to plastic sheeting test skill
Art field.
Background technology
Perfluoroethylene-propylene (FEP) is a kind of crystalline polymer, is copolymerized by tetrafluoroethene (TFE) and hexafluoropropene (HFP)
Form, there is excellent heat resistance, low frictional properties, non-stick and lubricity, chemical resistance, heat endurance and electric insulation
Property, melt-processable, it is widely used in the sophisticated sections such as mechanical department and rocket, guided missile, aerospace such as electric, electronics, chemical industry, aviation
The department such as technology and national defense industry.
But when perfluoroethylene-propylene is used for electric wire, finished product plastic, because it has molding shrinkage, shrink
Its normal use is had a strong impact on when big, and its shrinkage factor changes the different correlations from synthetic technological condition, lot number, accordingly, it is determined that
The shrinkage factor of perfluoroethylene-propylene, there is directive significance to follow-up processed and applied.
Standard GB/T 9352-2008/ISO 293：2004, which give thermoplastic, is molded two kinds of conventionally used moulds
Have type and its manufacture requires, molding and cooling means.But it only illustrates the extensive molding methods of thermoplastic, not
The specific size of mould, specific pressure, temperature and the clamp time of specific plastics kind compression molding process etc. are described in detail.
Standard GB/T 15585-1995/ASTM D955 give the method for testing of injection shrinkage factor, and give injection
The specific size and sample measurement method and shrinkage factor computational methods of mould.But the flowing of its injection moulding process melt can cause greatly
The shearing orientation of molecule, cause different with the contraction parallel to stream direction perpendicular to stream, it is impossible to directly display out poly- perfluor
The shrinkage of ethylene-propylene resin material in itself, and its defined die size is when applied to perfluoroethylene-propylene, due to thickness
Spend small, easily cause warpage and deformation, final testing result is had larger error.
CN202011124 U disclose a kind of testing injection mold for detecting shrinkage rate of thermoplastic plastics, it is necessary to coordinate injection
Machine uses, and equally exists parallel to stream and is orientated inconsistence problems perpendicular to stream.
CN104132623 A give a kind of characteristic length using tolling measurement plastic part curved surface, and directly read
The survey tool of shrinkage factor, although convenient and swift, relatively it is applied to the curved surface part of shaping, for the especially small modeling of shrinkage factor
Material, accuracy be not high.
The content of the invention
It is an object of the invention to provide a kind of method of testing of exhaustive fluorinated ethylene propylene molding shrinkage, its cost
Low, simple, intuitive is easy, and measurement result accuracy is high, data reference is provided for perfluoroethylene-propylene following process use, to life
Production has directive significance.
The method of testing of exhaustive fluorinated ethylene propylene molding shrinkage of the present invention, it is to poly- using compression molding method
Fluorinated ethylene propylene resin is molded, and by specimen length after cavity length and shaping come shrinkage from mold dimensions, is set on mould therefor
There are thermometer hole and ply bar scot.
During the compression molding, preheating time 20-25min, preheating pressure 1.5-3.5MPa；Briquetting pressure is 2-
20MPa, preferably 5-10MPa；The hot-forming time is 2-10min, preferably 2-5min；Forming temperature is 280-360 DEG C, excellent
Elect 300-350 DEG C as.
The mould is divided into formpiston and former, and die cavity is square.
The thermometer hole is on former, and thermometer hole is apart from die cavity side wall 5-10mm.
The a diameter of 2-8mm of thermometer hole, preferably 2-5mm.Thermometric hole depth is 20-80mm, preferably 40-60mm.
Formpiston and the former length of side is 120-180mm, and former thickness is 30-40mm, cavity space length L1=
60mm, depth d=12-14mm；The thickness that formpiston does not include formpiston be 20-30mm, and force plunger thickness is 8-10mm, formpiston with
The cavity size formed after die combinations is 60mm × 60mm × 4mm.
The ply bar scot is located in the symmetric angle of mould.
The die sinking groove depth is 10-15mm.
High temperature resistant silicon oils may be selected in one layer of releasing agent of coating in the mould, releasing agent, or selects internal chromium plating
Mould.
Used molding apparatus is vulcanizing press.
Before test, following preparation is carried out：
Get out vulcanizing press, including a hot press and a cold press, digital display calliper, molding die, releasing agent；
It is ready to need the exhaustive fluorinated ethylene propylene sample of drying tested；
One layer of releasing agent of coating in molding die charging die cavity, is easy to be stripped.
The method of testing of described exhaustive fluorinated ethylene propylene molding shrinkage, specifically includes following steps：
(1) exhaustive fluorinated ethylene propylene sample is placed in mould, thermocouple is placed in thermometer hole, monitors mould temperature in real time
Degree, then mould is placed on to heat on more than 300 DEG C of hot press and pressurizeed；
(2) mould with sample on hot press is placed in cold moudling 3-15min on the cold press of logical recirculated water；
(3) mould is molded at ply bar scot, takes out compacting sample, it is flat that it is measured after being placed 24 hours in normal temperature environment
Row end face length, each sample difference parallel position at least at 3 of suppressing measure its length, then take its average value as sample
Length L2；The buckling deformation situation of detection compacting sample, when deflection exceedes the 1% of its measurement size, gives up and does not have to；
(4) according to formula：Shrinkage factor=(cavity space length L1- specimen length L2) × 100%/cavity space length
L1, calculate the molding shrinkage after perfluoroethylene-propylene shaped article is placed 24 hours.
0.01mm is accurate to when measuring specimen length.
The every batch of exhaustive fluorinated ethylene propylene sample can parallel tabletting test 3-5 times, take its average value.
Because exhaustive fluorinated ethylene propylene shrinkage factor itself is smaller, size no longer changes substantially after depanning 24 hours,
Therefore the length of 24 hours after depanning need to be only measured, calculate its molding shrinkage of 24 hours.
The present invention only needs to use simple equipment, including hot press, cold press, simple mould, digital display calliper and thermoelectricity
It is even etc., real time temperature monitoring control is carried out by the thermometer hole on mould, die sinking sampling is carried out by ply bar scot, it is simple direct
The measure of shrinkage factor is carried out to exhaustive fluorinated ethylene propylene material.
The present invention compared with prior art, has the advantages that：
(1) present invention uses compression-moulding methods to fluoro ethyl propene resin material, and equipment is simple, convenient formation, overcomes
The flowing of injection moulding process melt causes the shearing of macromolecular to be orientated, causes stream direction to shrink the shortcomings that different in the prior art.
(2) thermometer hole being provided with mould therefor of the present invention, it is easy to the temperature of monitoring mould inside in real time, prevents local temperature
Height is spent, improves the quality of shaped article, good material base is provided for the test of shrinkage factor.
(3) ply bar scot being provided with mould therefor of the present invention, is easy to mold, and prevents that shaped article is caused to damage during die sinking
It is bad, provide good material base for the test of shrinkage factor.
(4) assay method of the present invention is simple, directly perceived, and measurement result is the shrinkage factor of material in itself, and accuracy is high, complete to gather
Fluoro ethyl propene following process has directive significance using data reference is provided, to production.
Brief description of the drawings
Fig. 1 is female mould structure schematic diagram；
Fig. 2 and Fig. 3 is formpiston structural representation；
In figure：1st, former；2nd, die cavity；3rd, thermometer hole；4th, ply bar scot；5th, formpiston.
Embodiment
With reference to embodiment, the present invention is further illustrated, but it is not intended to limit the implementation of the present invention.
As Figure 1-3, the relative dimensions of mould are as follows：
Formpiston and the former length of side are 140mm, the cavity size formed after formpiston and die combinations be 60mm × 60mm ×
4mm；Former thickness 35mm, cavity space length L1=60mm, depth d=12mm；Formpiston thickness (removing formpiston) is 25mm, sun
Mould formpiston thickness is 8mm.Thermometer hole is located on former, and it is apart from die cavity side wall 8mm, a diameter of 4mm；Thermometric hole depth is
50mm.Ply bar scot is located in the symmetric angle of mould, depth 12mm.
Vulcanizing press, including a hot press and a cold press are got out, digital display calliper (0-150mm), is molded mould
Tool, releasing agent (organic siliconresin 1153)；
It is ready to need 5 parts, every part of 40.00g, error 0.02g of the exhaustive fluorinated ethylene propylene of the drying sample tested.
In molding die charging die cavity and formpiston inner surface coats one layer of releasing agent, is easy to be stripped.
The method of testing of described exhaustive fluorinated ethylene propylene molding shrinkage, specifically includes following steps：
(1) exhaustive fluorinated ethylene propylene sample is placed in mould, thermocouple is placed in thermometer hole, monitors mould temperature in real time
Degree, then mould is placed on to heat on 330 DEG C of hot presses and pressurizeed；23min, preload pressure 3MPa, molding time 5min are preheated,
Briquetting pressure is 10MPa.
(2) mould with sample on hot press is placed on the cold press of logical recirculated water and cools down 15min, gone out to 50 DEG C
Mould.
(3) mould is molded at ply bar scot, takes out compacting sample, it is flat that it is measured after being placed 24 hours in 25 DEG C of environment
Row end face length, each sample difference parallel position at 3 of suppressing measure its length, then take its average value as specimen length
L2；The buckling deformation situation of detection compacting sample, when deflection exceedes the 1% of its measurement size, gives up and does not have to；Measure sample length
0.01mm is accurate to when spending.The every batch of exhaustive fluorinated ethylene propylene sample can parallel tabletting test 3-5 times, take its average value.
(4) according to formula：Shrinkage factor=(cavity space length L1- specimen length L2) × 100%/cavity space length
L1, calculate the molding shrinkage after perfluoroethylene-propylene shaped article is placed 24 hours.
Because exhaustive fluorinated ethylene propylene shrinkage factor itself is smaller, size no longer changes substantially after depanning 24 hours,
Therefore the length of 24 hours after depanning need to be only measured, calculate its molding shrinkage of 24 hours.
Test result is as shown in table 1.
The perfluoroethylene-propylene molding shrinkage test result of table 1
Claims (9)
- A kind of 1. method of testing of exhaustive fluorinated ethylene propylene molding shrinkage, it is characterised in that：Using compression molding method to poly- Fluorinated ethylene propylene resin is molded, and by specimen length after cavity length and shaping come shrinkage from mold dimensions, is set on mould therefor There are thermometer hole and ply bar scot；Briquetting pressure is 5-10MPa；Mould is divided into formpiston and former, and die cavity is square；Formpiston and former The cavity size formed after combination is 60mm × 60mm × 4mm.
- 2. the method for testing of exhaustive fluorinated ethylene propylene molding shrinkage according to claim 1, it is characterised in that：Molding During shaping, preheating time 20-25min, preheating pressure 1.5-3.5MPa；Molding time is 2-10min, and forming temperature is 280-360℃。
- 3. the method for testing of exhaustive fluorinated ethylene propylene molding shrinkage according to claim 1, it is characterised in that：Thermometric Hole is on former, and thermometer hole is apart from die cavity side wall 5-10mm.
- 4. the method for testing of exhaustive fluorinated ethylene propylene molding shrinkage according to claim 1, it is characterised in that：Thermometric Bore dia is 2-8mm.
- 5. the method for testing of exhaustive fluorinated ethylene propylene molding shrinkage according to claim 1, it is characterised in that：Formpiston It is 120-180mm with the former length of side, former thickness is 30-40mm, cavity space length L1=60mm, depth d=12- 14mm；The thickness that formpiston does not include formpiston is 20-30mm, and force plunger thickness is 8-10mm.
- 6. the method for testing of exhaustive fluorinated ethylene propylene molding shrinkage according to claim 1, it is characterised in that：Die sinking Groove is located in the symmetric angle of mould.
- 7. the method for testing of exhaustive fluorinated ethylene propylene molding shrinkage according to claim 6, it is characterised in that：Die sinking Groove depth is 10-15mm.
- 8. the method for testing of exhaustive fluorinated ethylene propylene molding shrinkage according to claim 6, it is characterised in that：Mould One layer of releasing agent of interior coating.
- 9. according to the method for testing of any described exhaustive fluorinated ethylene propylene molding shrinkages of claim 1-8, its feature exists In specifically including following steps：(1) exhaustive fluorinated ethylene propylene sample is placed in mould, thermocouple is placed in thermometer hole, mould is then placed on hot pressing Pressurization is heated on machine；(2) mould with sample on hot press is placed in cold moudling on the cold press of logical recirculated water；(3) mould is molded at ply bar scot, takes out compacting sample, its parallel end is measured after being placed 24 hours in normal temperature environment Face length, each sample difference parallel position at least at 3 of suppressing measure its length, then take its average value as specimen length L2；The buckling deformation situation of detection compacting sample, when deflection exceedes the 1% of its measurement size, gives up and does not have to；(4) according to formula：Shrinkage factor=(cavity space length L1- specimen length L2) × 100%/cavity space length L1, meter Calculate the molding shrinkage after perfluoroethylene-propylene shaped article is placed 24 hours.
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| CN201511029269.3A CN105643856B (en) | 2015-12-31 | 2015-12-31 | The method of testing of exhaustive fluorinated ethylene propylene molding shrinkage |
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| CN109142687A (en) * | 2018-08-14 | 2019-01-04 | 佛山市天宝利硅工程科技有限公司 | A kind of mold and its method measuring sealant linear shrinkage |
| CN113238006B (en) * | 2021-05-13 | 2022-09-23 | 上海交通大学 | Mold and method for measuring shrinkage rate of wax material and application |
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| DE102014102911A1 (en) * | 2014-03-05 | 2015-09-10 | Krones Aktiengesellschaft | Method and device for determining shrinkage characteristics of a sheet of thermoplastic material |
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