CN113895016B - Double-screw combination and processing technology for melting modification processing of polyvinyl alcohol material - Google Patents
Double-screw combination and processing technology for melting modification processing of polyvinyl alcohol material Download PDFInfo
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- CN113895016B CN113895016B CN202111043881.1A CN202111043881A CN113895016B CN 113895016 B CN113895016 B CN 113895016B CN 202111043881 A CN202111043881 A CN 202111043881A CN 113895016 B CN113895016 B CN 113895016B
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- 239000004372 Polyvinyl alcohol Substances 0.000 title claims abstract description 63
- 229920002451 polyvinyl alcohol Polymers 0.000 title claims abstract description 63
- 239000000463 material Substances 0.000 title claims abstract description 42
- 238000012986 modification Methods 0.000 title claims abstract description 27
- 230000004048 modification Effects 0.000 title claims abstract description 27
- 238000012545 processing Methods 0.000 title claims abstract description 23
- 238000002844 melting Methods 0.000 title claims abstract description 12
- 230000008018 melting Effects 0.000 title claims abstract description 12
- 238000005516 engineering process Methods 0.000 title claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 82
- 239000000155 melt Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 12
- 238000007906 compression Methods 0.000 claims description 47
- 230000006835 compression Effects 0.000 claims description 47
- 239000006185 dispersion Substances 0.000 claims description 8
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 claims description 4
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims description 4
- 229930195725 Mannitol Natural products 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 4
- 239000000845 maltitol Substances 0.000 claims description 4
- 235000010449 maltitol Nutrition 0.000 claims description 4
- VQHSOMBJVWLPSR-WUJBLJFYSA-N maltitol Chemical compound OC[C@H](O)[C@@H](O)[C@@H]([C@H](O)CO)O[C@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O VQHSOMBJVWLPSR-WUJBLJFYSA-N 0.000 claims description 4
- 229940035436 maltitol Drugs 0.000 claims description 4
- 239000000594 mannitol Substances 0.000 claims description 4
- 235000010355 mannitol Nutrition 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 239000000600 sorbitol Substances 0.000 claims description 4
- 239000004014 plasticizer Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 12
- 238000011161 development Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 3
- 230000008092 positive effect Effects 0.000 abstract description 3
- 238000012827 research and development Methods 0.000 abstract description 3
- 239000002861 polymer material Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 16
- 238000001125 extrusion Methods 0.000 description 11
- 238000009826 distribution Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 235000021355 Stearic acid Nutrition 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000010128 melt processing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004383 yellowing Methods 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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/67—Screws having incorporated mixing devices not provided for in groups B29C48/52 - B29C48/66
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/15—Heterocyclic compounds having oxygen in the ring
- C08K5/151—Heterocyclic compounds having oxygen in the ring having one oxygen atom in the ring
- C08K5/1545—Six-membered rings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
Abstract
The invention relates to the technical field of polymer material processing, in particular to a double-screw combination and processing technology for melting modification processing of a polyvinyl alcohol material. According to the rheological characteristics of the polyvinyl alcohol material, the length ratio of each functional section in the screw and the type of the adopted threaded element are limited, so that the double-screw combination is fully matched with the polyvinyl alcohol material, the melt mixing of the polyvinyl alcohol material is improved, the plasticizing effect in the modification processing process of the polyvinyl alcohol is effectively improved, and the modified polyvinyl alcohol material has better mechanical properties. Compared with the traditional research and development thought for changing the formula of the polyvinyl alcohol material, the method provides a more novel, universal and environment-friendly solution, and has positive effects on the improvement and deep development of the double-screw melting plasticizing modification technology of the PVA material.
Description
Technical Field
The invention relates to the technical field of polymer material processing, in particular to a double-screw combination and processing technology for melting modification processing of a polyvinyl alcohol material.
Background
Polyvinyl alcohol (PVA) is a water-soluble biodegradable material with good oil resistance, wear resistance and gas barrier property, and is widely used in the fields of medical treatment, food, washing, toxic packaging, transportation and the like because of being environment-friendly and having various properties after being modified. The PVA has regular molecular structure and high crystallinity, and a large number of hydroxyl groups on a molecular chain can form strong hydrogen bonds, so that the PVA has strong intramolecular acting force, the melt processing temperature and the decomposition temperature of the PVA are very close, and the PVA is difficult to directly carry out thermoplastic processing. In view of this, PVA modification processing methods such as copolymerization modification, compound blending modification, post-reaction modification, plasticization modification and the like are developed at present; among them, the plasticizing modification method of adding small molecular substances and oligomers is most directly effective for realizing PVA melt processing.
The double-screw extrusion plasticizing melting modification has the advantages of small equipment investment, high production efficiency, low energy consumption, short process flow, low maintenance cost and the like, can greatly expand the production and use of PVA, and is a hot spot for current research. The twin-screw melt extrusion requires one-step direct completion of plasticizing and mixing processing of PVA resin and modifying auxiliary components, and besides the proper modification formula, the configuration combination of the twin-screw and the extrusion process have a critical influence on the melt plasticizing modification of PVA. However, current research is mainly focused on improving plasticization of PVA by formulation modification, and little research is conducted on twin screw compounding and extrusion process, and thus, complex formulations are often required to achieve melt modification of PVA with higher quality, and the introduction of excessive additives inevitably affects the performance of PVA itself and is not friendly to the environment.
Disclosure of Invention
Based on the above, it is necessary to provide a twin-screw combination and processing technology for melt modification processing of polyvinyl alcohol materials, which is designed according to the rheological characteristics of PVA materials, has good matching degree with PVA, and can greatly improve the quality of melt modified PVA products by adopting a simple modification formula.
In one aspect of the invention, a twin screw combination for melt modification processing of polyvinyl alcohol materials is provided, comprising two intermeshing parallel co-directional screws comprising, in percent of total screw length:
wherein, the model of the screw thread component that the charging section adopted includes: 24/24;
the type of the screw thread element adopted by the conveying section comprises: 24/24 and/or 20/20;
the type of the screw thread component adopted by the conveying compression section comprises: 16/16 and/or 12/12;
the types of the screw thread elements adopted by the mixing section comprise: one or more of 30 °/7/24, 45 °/5/16, 45 °/5/24L, 60 °/4/16, 60 °/4/24, 90 °/5/16, 90 °/5/24;
the type of the screw thread component that the section was pressed in the reverse construction adopted includes: 12/6L, 12/12, 16/16, 45 DEG/5/24L;
the model of the screw thread component adopted by the vacuum conveying section comprises: 24/24 and/or 20/20;
the type of the screw thread component that the section was built in the measurement includes: 16/16 and/or 12/12.
According to the rheological characteristics of the polyvinyl alcohol material, the length ratio of each functional section in the screw and the type of the adopted threaded element are limited, so that the double-screw combination is fully matched with the polyvinyl alcohol material, the melt mixing of the polyvinyl alcohol material is improved, the plasticizing effect in the modification processing process of the polyvinyl alcohol is effectively improved, and the modified polyvinyl alcohol material has better mechanical properties. Compared with the traditional research and development thought for changing the formula of the polyvinyl alcohol material, the method provides a more novel, universal and environment-friendly solution, and has positive effects on the improvement and deep development of the double-screw melting plasticizing modification technology of the PVA material.
In some embodiments, the conveying section comprises at least two conveying subsections, the conveying compression section comprises at least two conveying compression subsections, and the mixing section comprises at least two mixing subsections; the screw comprises at least two sub-segment combinations, wherein the sub-segment combinations comprise at least two of the conveying sub-segment, the conveying compression sub-segment and the mixing sub-segment.
In some embodiments, the conveying section comprises 2-7 conveying subsections, the conveying compression section comprises 2-6 conveying compression subsections, and the mixing section comprises 2-6 mixing subsections; the screw comprises 2-6 sub-segment combinations, wherein each sub-segment combination comprises the conveying sub-segment, the conveying compression sub-segment and the mixing sub-segment.
In some embodiments, the sub-segment combination is formed by arranging the conveying sub-segment, the conveying compression sub-segment and the mixing sub-segment in sequence.
In some embodiments, the delivery sub-segment comprises 1-5 corresponding threaded elements, the delivery compression sub-segment comprises 1-7 corresponding threaded elements, and the mixing sub-segment comprises 1-3 corresponding threaded elements.
In some embodiments, the mixing section comprises a melt mixing section and a dispersion mixing section, wherein the melt mixing section comprises 8% -15% of the total length of the screw and 8% -18% of the total length of the screw, and the screw comprises the following screw elements: one or more of 30 DEG/7/24, 45 DEG/5/24, 60 DEG/4/24, 90 DEG/5/24, the type of the screw elements employed in the dispersive mixing section comprising: one or more of 45 DEG/5/16, 45 DEG/5/24L, 60 DEG/4/16, 60 DEG/4/24, 90 DEG/5/24.
In another aspect of the present invention, a process for melt modifying a polyvinyl alcohol material is provided, comprising the steps of:
the polyvinyl alcohol material is pre-mixed and then placed into the hopper of a twin screw extruder and processed using the twin screw combination described above.
In some embodiments, the polyvinyl alcohol material comprises the following components in parts by mass:
in some embodiments, the plasticizer comprises the following components in parts by mass:
5-15 parts of mannitol;
1-5 parts of sorbitol; and
1-5 parts of maltitol.
In some embodiments, the operating temperatures of the functional sections in the twin screw combination are respectively:
in some embodiments, the mixing section comprises a melt mixing section and a dispersion mixing section, the melt mixing section operating at a temperature of 115 ℃ to 175 ℃ and the dispersion mixing section operating at a temperature of 125 ℃ to 190 ℃.
In some embodiments, the twin screw combination operates at a speed of 80RPM to 300RPM.
Drawings
FIG. 1 is a schematic layout of a screw assembly of example 1;
FIG. 2 is a schematic layout of the screw combination of comparative example 1;
FIG. 3 is a graph showing the extrusion effect of example 1;
FIG. 4 is a graph showing the extrusion effect of comparative example 1;
FIG. 5 is a graph showing the extrusion effect of comparative example 2;
FIG. 6 is a graph showing the extrusion effect of comparative example 3.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. In the description of the present invention, the meaning of "several" means at least one, such as one, two, etc., unless specifically defined otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In one aspect of the invention, a twin-screw combination for melt modification processing of polyvinyl alcohol materials is provided, comprising two intermeshing parallel co-directional screws comprising, in percent of the total length of the screws:
wherein, the model of the screw thread component that the charging section adopted includes: 24/24;
the type of screw element employed in the conveying section includes: 24/24 and/or 20/20;
the types of screw elements used for conveying the compression section include: 16/16 and/or 12/12;
the types of screw elements used in the mixing section include: one or more of 30 °/7/24, 45 °/5/16, 45 °/5/24L, 60 °/4/16, 60 °/4/24, 90 °/5/16, 90 °/5/24;
the type of the screw thread component that the section was pressed in reverse construction adopted includes: 12/6L, 12/12, 16/16, 45 DEG/5/24L;
the model of the screw element used for the vacuum conveying section comprises: 24/24 and/or 20/20;
the model of the screw thread component that the section was built in to the measurement includes: 16/16 and/or 12/12.
According to the rheological characteristics of the polyvinyl alcohol material, the length ratio of each functional section in the screw and the type of the adopted threaded element are limited, so that the double-screw combination is fully matched with the polyvinyl alcohol material, the melt mixing of the polyvinyl alcohol material is improved, the plasticizing effect in the modification processing process of the polyvinyl alcohol is effectively improved, and the modified polyvinyl alcohol material has better mechanical properties. Compared with the traditional research and development thought for changing the formula of the polyvinyl alcohol material, the method provides a more novel, universal and environment-friendly solution, and has positive effects on the improvement and deep development of the double-screw melting plasticizing modification technology of the PVA material.
Preferably, the screw comprises the following functional segments, in percentages of the total length of the screw:
wherein, the model of the screw thread component that the charging section adopted includes: 24/24;
the type of screw element employed in the conveying section includes: 24/24 and 20/20;
the types of screw elements used for conveying the compression section include: 16/16 and 12/12;
the types of screw elements used in the mixing section include: 30/7/24, 45/5/24L and 60/4/24;
the type of the screw thread component that the section was pressed in reverse construction adopted includes: 12/6L, 12/12, 16/16, 45 DEG/5/24L;
the model of the screw element used for the vacuum conveying section comprises: 24/24 and 20/20;
the model of the screw thread component that the section was built in to the measurement includes: 16/16 and 12/12.
In some embodiments, the conveying section comprises at least two conveying subsections, the conveying compression section comprises at least two conveying compression subsections, and the mixing section comprises at least two mixing subsections; the screw comprises at least two sub-segment combinations, wherein each sub-segment combination comprises at least two of a conveying sub-segment, a conveying compression sub-segment and a mixing sub-segment. Each functional section is divided into a plurality of functional subsections, and then the functional subsections are combined into a plurality of subsection combinations, so that the screw rod formed by combining the functional subsections which are not decomposed into the functional subsections and are arranged continuously has better melting plasticizing effect on the polyvinyl alcohol under the same length.
In some embodiments, the conveying section comprises 2-7 conveying subsections, the conveying compression section comprises 2-6 conveying compression subsections, and the mixing section comprises 2-6 mixing subsections; the screw comprises 2-6 sub-segment combinations, wherein each sub-segment combination comprises a conveying sub-segment, a conveying compression sub-segment and a mixing sub-segment. Preferably, the conveying section comprises 5-6 conveying subsections, the conveying compression section comprises 4-5 conveying compression subsections, and the mixing section comprises 4-5 mixing subsections. The number of the subsections of each functional section is limited, so that the screw has better melting plasticizing capability within a certain length range.
In some embodiments, the sub-segment combination is formed by arranging conveying sub-segments, conveying compression sub-segments and mixing sub-segments in sequence. The arrangement mode of the sub-section combination also has direct influence on the melting plasticizing effect of the screw, and the modified polyvinyl alcohol with better performance can be obtained by arranging according to a preset mode.
In some embodiments, the delivery sub-section comprises 1-5 corresponding threaded elements, the delivery compression sub-section comprises 1-7 corresponding threaded elements, and the mixing sub-section comprises 1-3 corresponding threaded elements.
In some embodiments, the charging section comprises 3-5 corresponding threaded elements, the reverse build section comprises 1-2 corresponding threaded elements, and the metering build section comprises 7-9 corresponding threaded elements.
In some embodiments, the mixing section comprises a melt mixing section and a dispersion mixing section, wherein the melt mixing section comprises 8% -15% and 8% -18% of the total length of the screw, respectively, and the screw comprises a screw thread element of the type: one or more of 30 DEG/7/24, 45 DEG/5/24, 60 DEG/4/24, 90 DEG/5/24, the type of screw elements employed in the dispersive mixing section comprises: one or more of 45 DEG/5/16, 45 DEG/5/24L, 60 DEG/4/16, 60 DEG/4/24, 90 DEG/5/24.
Preferably, in some embodiments, the screw comprises, in order: the device comprises a feeding section, a first conveying sub-section, a first conveying compression sub-section, a first mixing sub-section, a second conveying compression sub-section, a second mixing sub-section, a third conveying compression sub-section, a third mixing sub-section, a fourth conveying compression sub-section, a fourth mixing sub-section, a fifth conveying compression sub-section, a fifth mixing sub-section, a reverse pressure building section, a sixth conveying sub-section, a vacuum conveying section and a metering pressure building section.
Preferably, in some embodiments, the charging section comprises 3 respective threaded elements, the first delivery sub-section comprises 5 respective threaded elements, the first delivery compression sub-section comprises 7 respective threaded elements, the first mixing sub-section comprises 2 respective threaded elements, the second delivery sub-section comprises 3 respective threaded elements, the second delivery compression sub-section comprises 2 respective threaded elements, the second mixing sub-section comprises 2 respective threaded elements, the third delivery compression sub-section comprises 1 respective threaded element, the third mixing sub-section comprises 2 respective threaded elements, the fourth delivery compression sub-section comprises 3 respective threaded elements, the fourth mixing sub-section comprises 2 respective threaded elements, the fifth delivery sub-section comprises 1 respective threaded element, the fifth delivery compression sub-section comprises 3 respective threaded elements, the fifth mixing sub-section comprises 1 respective threaded element, the reverse pressure build-section comprises 1 respective threaded element, the third delivery sub-section comprises 2 respective threaded elements, the fourth delivery sub-section comprises 3 respective threaded elements, and the fourth delivery sub-section comprises 3 respective threaded elements.
In some embodiments, the twin screw combinations provided herein are applied to twin screw extruders having aspect ratios of (36-52): 1, preferably, particularly to twin screw extruders having aspect ratios of 44:1.
In another aspect of the present invention, a process for melt modifying a polyvinyl alcohol material is provided, comprising the steps of:
the polyvinyl alcohol material is pre-mixed and then placed into the hopper of a twin screw extruder and processed using the twin screw combination described above.
In some embodiments, the polyvinyl alcohol material comprises the following components in parts by mass:
in some embodiments, the plasticizer comprises the following components in parts by mass:
5-15 parts of mannitol;
1-5 parts of sorbitol; and
1-5 parts of maltitol.
In some embodiments, preferably, the polyvinyl alcohol material comprises the following components in parts by mass:
in some embodiments, the operating temperatures of the functional stages in the twin screw combination are respectively:
in some embodiments, the mixing section comprises a melt mixing section and a dispersion mixing section, the melt mixing section operating at a temperature of 115 ℃ to 175 ℃ and the dispersion mixing section operating at a temperature of 125 ℃ to 190 ℃.
Preferably, in some embodiments, the temperature of the charging section is 90 ℃ to 120 ℃, the temperature of the first conveying sub-section is 120 ℃ to 140 ℃, the temperature of the first conveying compression sub-section is 130 ℃ to 150 ℃, the temperature of the first mixing sub-section is 120 ℃ to 160 ℃, the temperature of the second conveying compression sub-section is 130 ℃ to 170 ℃, the temperature of the second mixing sub-section is 135 ℃ to 170 ℃, the temperature of the third conveying sub-section is 140 ℃ to 180 ℃, the temperature of the third conveying compression sub-section is 140 ℃ to 180 ℃, the temperature of the third conveying sub-section is 140 ℃ to 180 ℃, the temperature of the fourth conveying sub-section is 145 ℃ to 180 ℃, the temperature of the fourth conveying compression sub-section is 145 ℃ to 180 ℃, the temperature of the fifth conveying compression sub-section is 150 ℃ to 185 ℃, the temperature of the fifth mixing sub-section is 150 ℃ to 185 ℃, the temperature of the reverse building sub-section is 150 ℃ to 190 ℃, the temperature of the sixth conveying sub-section is 155 ℃ to 155 ℃, the temperature of the fourth conveying sub-section is 155 ℃ to 180 ℃, the temperature of the fourth conveying sub-section is 155 ℃ to 155 ℃, the temperature of the fourth conveying sub-section is 150 ℃ to 155 ℃ and the temperature of the fifth conveying sub-stage is 200 ℃ to the temperature.
In some embodiments, the twin screw combination operates at a speed of 80RPM to 300RPM. Preferably, the twin screw combination operates at a speed of 100RPM to 200RPM.
The present invention will be described in further detail with reference to specific examples and comparative examples. It will be appreciated that the apparatus and materials used in the examples below are more specific and in other embodiments may not be limited thereto, for example, stearic acid may not be used as a lubricant, nor aluminum hydroxide may be used as a stabilizer.
Preparation of polyvinyl alcohol material:
80 parts of polyvinyl alcohol resin, 10 parts of mannitol, 4 parts of sorbitol, 3 parts of maltitol, 0.6 part of stearic acid and 0.4 part of aluminum hydroxide were added to a high-speed pre-mixer and mixed for 10 minutes at 1300 RPM.
The specific extrusion process comprises the following steps:
adding the prepared polyvinyl alcohol material into a double-screw extruder hopper with the length-diameter ratio of 44:1, modifying according to the double-screw combination, working temperature and rotating speed adopted in each example and comparative example, extruding the material strips, air-cooling, granulating and sealing for storage.
Example 1:
total length: 1002mm, each functional section total duty ratio:
the specific distribution of the screws is arranged in the order in which the threaded elements appear in the table (see fig. 1):
example 1 set rotational speed between 200RPM and 300RPM.
Example 2
Embodiment 2 is substantially identical to embodiment 1 except that each sub-segment of each fifth sub-segment combination is combined to a corresponding fourth sub-segment, i.e., embodiment 2 has a total of four sub-segment combinations, the first three sub-segment combinations being identical to embodiment 1, the fourth sub-segment combination becoming: fourth conveying subsections: 24/24, 20/20; fourth transport compression sub-section: 16/16, 12/12; fourth mixing subsection (dispersive mixing): 45 DEG/5/24, 45 DEG/5/24L.
Example 3:
total length: 1002mm, each functional section total duty ratio:
the specific distribution of the screws is arranged according to the sequence of appearance of the screw elements in the table:
example 3 set rotational speeds in the range of 100RPM to 200RPM.
Example 4
Total length: 1002mm, each functional section total duty ratio:
example 4 set rotational speed at 80RPM to 130RPM.
Comparative example 1
Total length: 1002mm, each functional section total duty ratio:
the specific distribution of the screws is arranged in the order in which the threaded elements appear in the table (see fig. 2):
the rotation speed of comparative example 1 was set to 80RPM to 130RPM.
Comparative example 2
Total length: 1002mm, each functional section total duty ratio:
the specific distribution of the screws is arranged according to the sequence of appearance of the screw elements in the table:
the rotational speed set in comparative example 2 is 200RPM to 300RPM.
Comparative example 3
Total length: 1002mm, each functional section total duty ratio:
the specific distribution of the screws is arranged according to the sequence of appearance of the screw elements in the table:
comparative example 3 set rotational speed between 100RPM and 200RPM.
Characterization and performance testing:
(1) PVA extrusion blending effect:
TABLE 1
Residence time: and (5) starting timing by feeding the double-screw blanking port until the die starts extruding the spline and finishing timing.
(2) PVA injection molding spline test effect:
tensile strength test standard: GB/T1040.2
Elongation at break test standard: GB/T1040.2
TABLE 2
From tables 1 and 2, it is apparent that the bars extruded in each example of the present invention were smooth, bubble-free, and had good tensile strength and elongation at break, especially in example 1, where the ratio of each functional segment was in the preferred range, with a tensile strength of 55MPa or more and an elongation at break of 160% or more. In comparative example 1, the ratio of the conveying section to the mixing section is not within the preset range, which results in rough extrusion surface of the sample strip, serious bamboo joint lines, yellowing of the sample strip and serious foaming, so that the tensile strength and the elongation at break are greatly reduced; in comparative example 2, the ratio of the conveying compression section to the mixing section is not in the preset range, so that the spline outlet die is layered, the spline outlet die is pale yellow, the plasticizing effect is poor, the melt strength is not high, the bars cannot be pulled, and the sample cannot be prepared; in comparative example 3, the ratio of the conveying section to the conveying compression section is not within the preset range, and although the sample bars are not significantly discolored in comparative examples 1 and 2, there is a problem that the latter sections are seriously foamed, so that the tensile strength and elongation at break are also poor, and the actual production requirements cannot be satisfied.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. The scope of the invention is therefore intended to be covered by the appended claims, and the description and drawings may be interpreted in accordance with the contents of the claims.
Claims (9)
1. A twin screw combination for melt modification processing of polyvinyl alcohol materials, comprising two intermeshing parallel co-directional screws, said screws comprising the following functional segments, in percent of the total length of the screws:
wherein, the model of the screw thread component that the charging section adopted includes: 24/24;
the type of the screw thread element adopted by the conveying section comprises: 24/24 and/or 20/20;
the type of the screw thread component adopted by the conveying compression section comprises: 16/16 and/or 12/12;
the types of the screw thread elements adopted by the mixing section comprise: one or more of 30 °/7/24, 45 °/5/16, 45 °/5/24L, 60 °/4/16, 60 °/4/24, 90 °/5/16, 90 °/5/24;
the type of the screw thread component that the section was pressed in the reverse construction adopted includes: 12/6L, 12/12, 16/16, 45 DEG/5/24L;
the model of the screw thread component adopted by the vacuum conveying section comprises: 24/24 and/or 20/20;
the type of the screw thread component that the section was built in the measurement includes: 16/16 and/or 12/12;
the conveying section at least comprises two conveying subsections, the conveying compression section at least comprises two conveying compression subsections, and the mixing section at least comprises two mixing subsections;
the screw comprises at least two sub-segment combinations, and each sub-segment combination is formed by arranging the conveying sub-segment, the conveying compression sub-segment and the mixing sub-segment in sequence;
the conveying subsections comprise 1-5 corresponding threaded elements, the conveying compression subsections comprise 1-7 corresponding threaded elements, and the mixing subsections comprise 1-3 corresponding threaded elements.
2. The twin screw combination as defined in claim 1, wherein the conveying section comprises 2-7 conveying subsections, the conveying compression section comprises 2-6 conveying compression subsections, and the mixing section comprises 2-6 mixing subsections; the screw comprises 2-6 sub-segment combinations, wherein each sub-segment combination comprises the conveying sub-segment, the conveying compression sub-segment and the mixing sub-segment.
3. The twin-screw combination according to any one of claims 1-2, wherein the mixing section comprises a melt mixing section and a dispersive mixing section, each comprising 8-15% and 8-18% of the total length of the screw, wherein the type of screw elements used in the melt mixing section comprises: one or more of 30 DEG/7/24, 45 DEG/5/24, 60 DEG/4/24, 90 DEG/5/24, the type of the screw elements employed in the dispersive mixing section comprising: one or more of 45 DEG/5/16, 45 DEG/5/24L, 60 DEG/4/16, 60 DEG/4/24, 90 DEG/5/24.
4. The melting modification processing technology of the polyvinyl alcohol material is characterized by comprising the following steps of:
a polyvinyl alcohol material pre-mixed and then placed into the hopper of a twin screw extruder and processed using the twin screw combination of any one of claims 1 to 3.
5. The processing technology according to claim 4, wherein the polyvinyl alcohol material comprises the following components in parts by mass:
6. the processing technology according to claim 5, wherein the plasticizer comprises the following components in parts by mass:
5-15 parts of mannitol;
1-5 parts of sorbitol; and
1-5 parts of maltitol.
7. The process according to any one of claims 4 to 6, wherein the working temperatures of the functional sections in the twin-screw assembly are respectively:
8. the process of claim 7, wherein the mixing section comprises a melt mixing section and a dispersion mixing section, the melt mixing section operating at a temperature of 115 ℃ to 175 ℃ and the dispersion mixing section operating at a temperature of 125 ℃ to 190 ℃.
9. The process of any one of claims 4 to 6, wherein the twin screw combination operates at a rotational speed of 80RPM to 300RPM.
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