CN112571763B - Low-temperature extrusion molding method of plasticized polyvinyl chloride or chlorinated polyvinyl chloride product - Google Patents
Low-temperature extrusion molding method of plasticized polyvinyl chloride or chlorinated polyvinyl chloride product Download PDFInfo
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- CN112571763B CN112571763B CN202011164457.8A CN202011164457A CN112571763B CN 112571763 B CN112571763 B CN 112571763B CN 202011164457 A CN202011164457 A CN 202011164457A CN 112571763 B CN112571763 B CN 112571763B
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- polyvinyl chloride
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- temperature
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- 239000004801 Chlorinated PVC Substances 0.000 title claims abstract description 35
- 229920000457 chlorinated polyvinyl chloride Polymers 0.000 title claims abstract description 34
- 238000001125 extrusion Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 21
- 229920012485 Plasticized Polyvinyl chloride Polymers 0.000 title claims abstract description 16
- 238000000465 moulding Methods 0.000 claims abstract description 7
- 229920002554 vinyl polymer Polymers 0.000 claims description 9
- 238000004898 kneading Methods 0.000 claims description 8
- 229920000915 polyvinyl chloride Polymers 0.000 abstract description 13
- 238000001879 gelation Methods 0.000 abstract description 12
- 239000004800 polyvinyl chloride Substances 0.000 abstract description 12
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000012752 auxiliary agent Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000012760 heat stabilizer Substances 0.000 abstract description 3
- 238000005728 strengthening Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 229920011532 unplasticized polyvinyl chloride Polymers 0.000 description 2
- 239000004605 External Lubricant Substances 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polychloroethylene Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000003017 thermal stabilizer Substances 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/06—PVC, i.e. polyvinylchloride
Abstract
The invention discloses a low-temperature extrusion molding method of a plasticized polyvinyl chloride or chlorinated polyvinyl chloride product, wherein an extruder adopted by the method is a double-screw extruder, and when the plasticized polyvinyl chloride is extruded, the display temperature of a machine barrel thermometer is lower than 160 ℃; when the chlorinated polyvinyl chloride is extruded, the apparent temperature of the machine barrel is lower than 180 ℃. The low-temperature extrusion molding method of the plasticized polyvinyl chloride or chlorinated polyvinyl chloride product realizes the effect of strengthening mechanical energy by increasing the rotating speed of the screw or changing the configuration of the screw, improves the gelation behavior and the flow property of PVC or CPVC, realizes the low-temperature extrusion processing molding of PVC, can reduce the use of auxiliary agents such as heat stabilizer and the like, reduces the cost of raw materials and energy consumption, and improves the service performance of the plasticized polyvinyl chloride or chlorinated polyvinyl chloride product.
Description
Technical Field
The invention relates to the technical field of high polymer material processing, in particular to a low-temperature extrusion molding method of a plasticized polyvinyl chloride or chlorinated polyvinyl chloride product.
Background
The non-plasticized polyvinyl chloride (PVC-U) or chlorinated polyvinyl chloride (CPVC) has moderate rigidity and toughness, flame retardance, excellent secondary processing characteristics and other outstanding use performances, so that the PVC has wide application in the fields of packaging materials, sectional materials, pipes, daily products and the like.
PVC-U or CPVC is usually extruded at a temperature of from 50 to 190℃in order to be able to be shaped smoothly due to the high viscosity and poor flowability of the melt (meter display temperature, hereinafter referred to as "meter display temperature"). However, PVC or CPVC is a heat-sensitive material that is easily decomposed by heat, deteriorating the color and service properties of the product. From the thirty decades of the last century to the present, methods of slowing or reducing the thermal decomposition of PVC or CPVC during processing have been to add thermal stabilizers to PVC or CPVC compounds. However, the addition of a heat stabilizer does not reduce the processing temperature and improve the fluidity, but improves the processability by adding an auxiliary agent such as a processing modifier and a lubricant. The high processing temperatures and improper use of external lubricants prevent PVC or CPVC from achieving high quality gelation (plasticization), thus increasing the cost of raw materials and compromising the physical mechanical properties of the article.
Disclosure of Invention
Aiming at the technical problems in the related art, the invention provides a low-temperature extrusion molding method of a plasticized polyvinyl chloride or chlorinated polyvinyl chloride product, which can overcome the defects in the prior art.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:
a low-temperature extrusion molding method of a plasticized polyvinyl chloride-free or chlorinated polyvinyl chloride product is characterized in that an adopted extruder is a double-screw extruder, and when the plasticized polyvinyl chloride-free product is extruded, the display temperature of a machine barrel thermometer is lower than 160 ℃; when the chlorinated polyvinyl chloride is extruded, the apparent temperature of the machine barrel is lower than 180 ℃.
Preferably, the apparent temperature, when extruding unplasticized polyvinyl chloride: the first area is lower than 100 ℃, the second area is lower than 130 ℃, the third area is lower than 150 ℃, the fourth area and the fifth area are both lower than 160 ℃, the surface temperature is shown when the chlorinated polyvinyl chloride is extruded, the first area is lower than 110 ℃, the second area is lower than 140 ℃, the third area is lower than 160 ℃, and the fourth area and the fifth area are both lower than 180 ℃.
Preferably, the apparent temperature, when extruding unplasticized polyvinyl chloride: the first area is lower than 90 ℃, the second area is lower than 120 ℃, the third area is lower than 150 ℃, the fourth area and the fifth area are both lower than 160 ℃, the surface temperature is shown when the chlorinated polyvinyl chloride is extruded, the first area is lower than 100 ℃, the second area is lower than 130 ℃, the third area is lower than 160 ℃, and the fourth area and the fifth area are both lower than 180 ℃.
Preferably, the twin screw extruder is a parallel twin screw extruder or a conical twin screw extruder.
Preferably, the twin-screw extruder is a co-rotating twin-screw extruder or an counter-rotating twin-screw extruder.
Preferably, the screw of the double-screw extruder is a conventional screw with only changed pitch, groove depth and helix angle, and the screw rotating speed is above 70 revolutions per minute during processing and molding.
Preferably, the screw configuration of the twin-screw extruder used is a combination of discs and screw elements, the discs may be of the same thickness or of different thicknesses, and may be of the same diameter or of different diameters, the discs and screw elements being arranged concentrically or eccentrically.
Preferably, the screw configuration of the twin-screw extruder used is a combination of kneading discs, which may be two-headed or three-headed, and may be of equal thickness or of different thickness, with screw elements. The kneading discs are arranged concentrically or eccentrically with respect to the screw elements.
Preferably, the screw configuration of the twin-screw extruder used is a combination of eccentric discs, kneading discs and flighted elements. The eccentric disc and the kneading disc are arranged concentrically or eccentrically with the screw elements.
Preferably, the screw speed is between 20 and 70 rpm during the forming process.
The invention has the beneficial effects that: the low-temperature extrusion molding method of the plasticized polyvinyl chloride or chlorinated polyvinyl chloride product realizes the effect of strengthening mechanical energy by increasing the rotating speed of the screw or changing the configuration of the screw, improves the gelation behavior and the flow property of PVC or CPVC, realizes the low-temperature extrusion processing molding of PVC, can reduce the use of auxiliary agents such as heat stabilizer and the like, reduces the cost of raw materials and energy consumption, and improves the service performance of the plasticized polyvinyl chloride or chlorinated polyvinyl chloride product.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
Example 1
Simulation of the influence of rotational speed on gelation behavior Using a Torque rheometer
The same ingredients were used, the rheometer was set at 150℃and the rotational speeds were 95rpm, 100rpm and 105rpm, and the machine was stopped when the machine was operated for 360 seconds, and the samples were rapidly sampled and thrown into ice water, and crushed after air-drying, and the gelation degree of the samples was measured by a torque rheometer method (a method of measuring gelation degree of a rigid polyvinyl chloride product by GB/T34917-2017), and the gelation energy consumption (the energy consumed per one increase in gelation degree) was calculated, and the results were shown in Table 1.
TABLE 1 influence of the rotational speed on the gelation behavior
As can be seen from Table 1, increasing the rotation speed significantly accelerates the gelation process, increases the gelation degree, and reduces the energy consumption.
Example 2
A low-temp extrusion moulding method for the non-plasticized PVC or chlorinated PVC product features that the extruder is a double-screw extruder, the screw is composed of kneading disk and screw element, and the rotation speed of screw is 20-70 rpm.
Using the drain mix, the tubing was extruded at two different temperatures and the tensile properties were measured by sampling from the tube wall (GB/T8804.2-2003 thermoplastic tubing tensile properties measurement). The effect of extrusion temperature on tensile properties is shown in Table 2.
TABLE 2 influence of temperature on tensile Properties
The results in Table 2 show that the tensile yield strength and elongation at break of the article are significantly improved using low temperature extrusion.
Example 3
The low temperature extrusion molding process of non-plasticized polyvinyl chloride or chlorinated polyvinyl chloride product adopts double screw extruder with screw structure comprising screw element, kneading disc and eccentric disc, and the screw rotating speed is 20-70 rpm.
The water pressure performance of the thermoplastic plastic pipe for fluid delivery at 20 ℃ for 1 hour (GB/T6111-2003) is measured by extruding the pipe at two different temperatures by using a water supply pipe mixture. The effect of extrusion temperature on water pressure resistance is shown in Table 3.
TABLE 3 influence of extrusion temperature on water pressure resistance
The results in Table 3 show that the water pressure resistance of the tubing at 20℃for 1h using low temperature extrusion meets [ IS01452-2:2009 plastic tubing for water and pressurized drainage and sewage on ground- -PVC-U part 2: the requirements of 42MPa for high-performance rigid polyvinyl chloride pipes and connectors for water supply of CJ/T493-2016 are not met by extrusion at normal temperature, but only the requirements of 38MPa for the national standard GB/T10002.1-2006 rigid polychloroethylene (PVC-U) pipe for water supply are met.
In summary, by means of the technical scheme, the low-temperature extrusion processing molding is realized by increasing the screw rotating speed of the traditional screw extruder to more than 70 revolutions per minute, or the screw configuration is changed, and the running extensional rheological function of the screw is enhanced, so that the components of the mixed materials are more fully dispersed and more uniformly mixed, the gelation behavior of PVC or CPVC is improved, the low-temperature extrusion processing molding under the normal rotating speed operation is realized, when the PVC-U is extruded, the apparent temperature of each region of the machine barrel is below 160 ℃, the temperature of one region is below 100 ℃, and the temperature of the other region is below 130 ℃; when CPVC is extruded, the apparent temperature of each area of the machine barrel is below 180 ℃, the temperature of the first area is below 110 ℃, and the temperature of the second area is below 140 ℃, so that the processing temperature is reduced, various auxiliary agents can be reduced, the service performance of the plasticized polyvinyl chloride or chlorinated polyvinyl chloride-free product is improved, the raw material cost is reduced, and the energy consumption is reduced.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. A low-temperature extrusion molding method of a plasticized polyvinyl chloride-free or chlorinated polyvinyl chloride product is characterized in that an adopted extruder is a double-screw extruder, and when the plasticized polyvinyl chloride-free product is extruded, the display temperature of a machine barrel thermometer is lower than 160 ℃; when the chlorinated polyvinyl chloride is extruded, the apparent temperature of the machine barrel is lower than 180 ℃; when the screw of the double-screw extruder is a screw with a conventional configuration, wherein the screw pitch, the groove depth and the helix angle of the screw are only changed, and the screw rotating speed is more than 70 revolutions per minute during processing and molding; when the screw configuration of the twin-screw extruder used is a combination of a disk and a screw element, a combination of a kneading disk and a screw element, or a combination of an eccentric disk, a kneading disk and a screw element, the screw rotation speed is 20 to 70 revolutions per minute at the time of processing and molding.
2. The method for low-temperature extrusion molding of a plasticized polyvinyl chloride-free or chlorinated polyvinyl chloride article according to claim 1, wherein the extrusion of the plasticized polyvinyl chloride-free article exhibits a temperature of: the first area is lower than 100 ℃, the second area is lower than 130 ℃, the third area is lower than 150 ℃, the fourth area and the fifth area are both lower than 160 ℃, the surface temperature is shown when the chlorinated polyvinyl chloride is extruded, the first area is lower than 110 ℃, the second area is lower than 140 ℃, the third area is lower than 160 ℃, and the fourth area and the fifth area are both lower than 180 ℃.
3. The method for low-temperature extrusion molding of a plasticized polyvinyl chloride-free or chlorinated polyvinyl chloride article according to claim 1, wherein the extrusion of the plasticized polyvinyl chloride-free article exhibits a temperature of: the first area is lower than 90 ℃, the second area is lower than 120 ℃, the third area is lower than 150 ℃, the fourth area and the fifth area are both lower than 160 ℃, the surface temperature is shown when the chlorinated polyvinyl chloride is extruded, the first area is lower than 100 ℃, the second area is lower than 130 ℃, the third area is lower than 160 ℃, and the fourth area and the fifth area are both lower than 180 ℃.
4. The method for low-temperature extrusion molding of a plasticized polyvinyl chloride or chlorinated polyvinyl chloride product according to claim 1, wherein the twin-screw extruder is a parallel twin-screw extruder or a conical twin-screw extruder.
5. The method for low-temperature extrusion molding of a plasticized polyvinyl chloride or chlorinated polyvinyl chloride product according to claim 1, wherein the twin-screw extruder is a co-rotating twin-screw extruder or an counter-rotating twin-screw extruder.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011164457.8A CN112571763B (en) | 2020-10-27 | 2020-10-27 | Low-temperature extrusion molding method of plasticized polyvinyl chloride or chlorinated polyvinyl chloride product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011164457.8A CN112571763B (en) | 2020-10-27 | 2020-10-27 | Low-temperature extrusion molding method of plasticized polyvinyl chloride or chlorinated polyvinyl chloride product |
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| Publication Number | Publication Date |
|---|---|
| CN112571763A CN112571763A (en) | 2021-03-30 |
| CN112571763B true CN112571763B (en) | 2023-10-31 |
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| CN202011164457.8A Active CN112571763B (en) | 2020-10-27 | 2020-10-27 | Low-temperature extrusion molding method of plasticized polyvinyl chloride or chlorinated polyvinyl chloride product |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT179664B (en) * | 1953-02-06 | 1954-09-25 | Oskar Czeija Kommanditgesellsc | Process for the production of records, in particular long-playing records |
| FR1387773A (en) * | 1964-04-10 | 1965-01-29 | Huels Chemische Werke Ag | Process for preparing, using the blowing process, physiologically flawless tubular sheets of plasticizer-free polyvinyl chloride |
| CA1145088A (en) * | 1979-09-07 | 1983-04-19 | William S. Underwood | Thermoplastic resin compositions containing a filler and artifacts formed therefrom |
| CN101914251A (en) * | 2010-08-20 | 2010-12-15 | 浙江大学 | Method for preparing high-flow high-heat-resistance transparent polyvinyl chloride alloy capable of injection molding |
| CN102532746A (en) * | 2010-12-27 | 2012-07-04 | 南京聚隆科技股份有限公司 | Soft and hard co-extrusion one-step forming method of un-plasticized polyvinyl chloride (U-PVC) profiled material and PVC adhesive tape |
| CN104494103A (en) * | 2014-12-30 | 2015-04-08 | 无锡科技职业学院 | Three-screw extruder |
| CN111138784A (en) * | 2019-12-30 | 2020-05-12 | 宜宾天亿新材料科技有限公司 | CPVC prefabricated pipe for biaxial orientation and production method thereof, CPVC-O pipe and production method thereof |
-
2020
- 2020-10-27 CN CN202011164457.8A patent/CN112571763B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT179664B (en) * | 1953-02-06 | 1954-09-25 | Oskar Czeija Kommanditgesellsc | Process for the production of records, in particular long-playing records |
| FR1387773A (en) * | 1964-04-10 | 1965-01-29 | Huels Chemische Werke Ag | Process for preparing, using the blowing process, physiologically flawless tubular sheets of plasticizer-free polyvinyl chloride |
| CA1145088A (en) * | 1979-09-07 | 1983-04-19 | William S. Underwood | Thermoplastic resin compositions containing a filler and artifacts formed therefrom |
| CN101914251A (en) * | 2010-08-20 | 2010-12-15 | 浙江大学 | Method for preparing high-flow high-heat-resistance transparent polyvinyl chloride alloy capable of injection molding |
| CN102532746A (en) * | 2010-12-27 | 2012-07-04 | 南京聚隆科技股份有限公司 | Soft and hard co-extrusion one-step forming method of un-plasticized polyvinyl chloride (U-PVC) profiled material and PVC adhesive tape |
| CN104494103A (en) * | 2014-12-30 | 2015-04-08 | 无锡科技职业学院 | Three-screw extruder |
| CN111138784A (en) * | 2019-12-30 | 2020-05-12 | 宜宾天亿新材料科技有限公司 | CPVC prefabricated pipe for biaxial orientation and production method thereof, CPVC-O pipe and production method thereof |
Non-Patent Citations (1)
| Title |
|---|
| UPVC挤出设备的塑化机理与配方调整的关系;谭展民, 彭永宏;塑料助剂(01);P33-39 * |
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| CN112571763A (en) | 2021-03-30 |
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