CN109627703B - Preparation method of biodegradable self-sealing strip - Google Patents
Preparation method of biodegradable self-sealing strip Download PDFInfo
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- CN109627703B CN109627703B CN201811293505.6A CN201811293505A CN109627703B CN 109627703 B CN109627703 B CN 109627703B CN 201811293505 A CN201811293505 A CN 201811293505A CN 109627703 B CN109627703 B CN 109627703B
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- sealing strip
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/16—End- or aperture-closing arrangements or devices
- B65D33/28—Strings or strip-like closures, i.e. draw closures
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The invention relates to a preparation method of a biodegradable self-sealing strip, which comprises the following steps of mixing 20-40% of PLA, PBAT: preparing a mixture in a mass percentage of 60-80%, adding the uniformly mixed mixture into a screw extruder for extrusion molding, plasticizing the mixture by an extrusion screw, molding by a die head, and cooling to obtain the molded self-sealing strip. The PLA and the PBAT are combined, so that the fully-degradable self-sealing strip product meeting the use requirement is produced under the condition that no other auxiliary agent is added.
Description
Technical Field
The invention relates to a preparation method of a self-sealing structure, in particular to a preparation method of a biodegradable self-sealing strip.
Background
The traditional self-sealing strips and self-sealing strips are produced by PP, PE and other materials, and are difficult to biodegrade in the environment after being discarded, so that pollution is formed. The packaging bag made of degradable materials is produced on the market at present, the bag body can be biologically degraded due to the adoption of the degradable materials, the application range is wider and wider, but in practical application, the bag body is often required to be provided with self-sealing strips or self-sealing strips and the like, and in order to realize full degradation, a biodegradable self-sealing strip product is necessary to be developed.
Polylactic acid (PLA) is a new biodegradable material made using starch feedstocks proposed by renewable plant resources such as corn. The starch raw material is made into lactic acid through a fermentation process, and then is converted into polylactic acid through chemical synthesis. The biodegradable plastic has good biodegradability, can be completely degraded by microorganisms in the nature after being used, finally generates carbon dioxide and water, does not pollute the environment, is very favorable for protecting the environment, and is a well-known environment-friendly material.
The self-sealing strip consists of a self-sealing strip and a sealing strip buckle, the production performance required by different parts is different, and the injection molding production of the self-sealing strip cannot be carried out by adopting pure PLA material at present. Therefore, the development of a preparation method of the biodegradable self-sealing strip is urgent.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a biodegradable self-sealing strip in the prior art.
The technical scheme adopted by the invention for solving the problems is as follows: a preparation method of a biodegradable self-sealing strip comprises the following steps of 20-40% of PLA, PBAT: preparing a mixture in a mass percentage of 60-80%, adding the uniformly mixed mixture into a screw extruder for extrusion molding, plasticizing the mixture by an extrusion screw, molding by a die head, and cooling to obtain the molded self-sealing strip.
Preferably, the extrusion screw and the die head form an angle of 90 degrees, and the outlet of the die head is downward, so that the self-sealing strip directly enters a cooling water tank for cooling when being extruded, and the bending deformation of the bone strip caused by gravity in the process of falling in a corner can be avoided.
Specifically, according to the raw material ratio of this application, set up the heating temperature who extrudes the screw: the primary temperature is 135 ℃; the secondary temperature is 145 ℃; the third-stage temperature is 160 ℃; the four-stage temperature is 165 ℃, the four-stage temperature is also the temperature at the die head, the rotating speed of the screw is 16-18 r/min, the traction speed is set according to the requirement on the size of the self-sealing strip, the traction speed is determined mainly according to the size of the final self-sealing strip, the larger the thickness is, the wider the width is, the slower the traction speed is, and the faster the traction speed is.
In order to achieve normal use strength, raw materials and sizes need to be considered comprehensively, and the size of the strand is designed according to the raw materials of the application: the section size of the self-sealing strip with the sealing strip buckle is 1.9-2.1mm in thickness and 10.5-11mm in width; the thickness of the hand-press self-sealing strip is 2-2.5mm, and the width is 20-22 mm.
The flexibility of the biodegradable self-sealing strip with the size completely meets the use requirement.
For the self-sealing strip with the pull head, the pull head is also prepared from biodegradable materials, and the pull head adopts an injection molding process: preparing a mixture according to the mass percent of PLA50% + PBAT50%, adding the uniformly mixed mixture into an injection molding machine, setting the screw temperature: the material inlet is at 130 deg.C, 150 deg.C, 160 deg.C, 170 deg.C and the nozzle is at 180 deg.C, and the draft angle of the injection mold is greater than 5 deg. due to the high viscosity of the material.
Compare from the strip of paper used for sealing, pull head intensity and hardness are all higher, consequently this application inventor has improved the content of PLA on the basis of the strip batching of paper used for sealing, and the batching after the improvement is also applicable to the production of moulding plastics more.
Compared with the prior art, the invention has the advantages that:
1) the biodegradable self-sealing strip is made of PLA + PBAT biodegradable plastic material as base material, the PLA is made of annual grains through extraction and polymerization, and the material essence determines that the PLA can be continuously regenerated and can be degraded by microorganisms when meeting water and return to nature. PLA material hardness itself is high, can't be used for extrusion molding production alone to satisfy normal use from the envelope, need add other auxiliaries, can have environmental hazard like this, and this application adopts PLA and PBAT to combine together, has realized producing the full degradation from the strip product of sealing that satisfies the operation requirement under the condition of not adding other any auxiliaries.
2) The pull head is a non-necessary accessory of the self-sealing strip, but often has certain market share, the other purpose of the application is to prepare the pull head made of PLA + PBAT biodegradable plastic material, the pull head is formed by injection molding, and the hardness of the produced pull head is detected to be equal to that of the pull head made of PE material and obtained by the same production equipment.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The preparation method of the biodegradable self-sealing strip comprises the following steps: according to the proportion of 40% of PLA and 40% of PBAT: preparing a mixture by 60 percent of mass percentage, adding the uniformly mixed mixture into a screw extruder for extrusion molding, plasticizing the mixture by an extrusion screw, molding by a die head, and cooling to obtain the molded self-sealing strip.
The production process parameters are as follows: the extrusion screw and the die head form an angle of 90 degrees, and the outlet of the die head faces downwards so that the self-sealing strip directly enters a cooling water tank for cooling when being extruded. Heating temperature of extrusion screw: the primary temperature is 135 ℃; the secondary temperature is 145 ℃; the third-stage temperature is 160 ℃; the four-stage temperature is 165 ℃, the four-stage temperature is also the temperature at the die head, the rotating speed of a screw is 16-18 r/min, the traction speed is set according to the requirement of the size of the self-sealing strip, and the traction speed is adjusted to ensure that the section size of the self-sealing strip is 1.9-2.1mm in thickness and 10.5-11mm in width.
The thickness of the hand-press self-sealing strip is 2-2.5mm, and the width is 20-22 mm.
The preparation method of the biodegradable self-sealing strip pull head comprises the following steps of: preparing a mixture according to the mass percent of PLA50% + PBAT50%, adding the uniformly mixed mixture into an injection molding machine, setting the screw temperature: the material inlet is 130 ℃, 150 ℃, 160 ℃, 170 ℃ and the nozzle is 180 ℃, and the draft angle of the injection mold is designed to be 5 degrees due to the large viscosity of the material, so that smooth demolding is facilitated.
Example 2
The self-sealing strip is pressed by hand, and the traction speed is adjusted, so that the size of the self-sealing strip meets the requirements of 2-2.5mm in thickness and 20-22mm in width.
Example 3
The utility model provides a fast fortune wrapping bag of heat preservation environmental protection with embodiment 1 full degradation, includes the bag body, and the bag body adopts double-deck surface fabric: the inner layer hot rolling non-woven fabric, the outer layer drench membrane non-woven fabric, middle intermediate layer, the intussuseption of middle intermediate layer is filled with the heat preservation fibre, and the bag body adopts PLA biodegradable plastic material to seal as the base stock, and the bag body adopts and seals the strip realization from the strip, and the chain body of sealing from the strip and the head material of sealing from the strip are PLA and PBAT's combined material.
The packaging bag is prepared by sequentially carrying out PLA spinning, thin non-woven fabric manufacturing, non-woven fabric film spraying, printing, bag making and cotton filling. The specific production steps are as follows
(1) And (3) PLA spinning: in order to prepare PLA fibre, adopt spinning level PLA section as the raw materials, carry out melt spinning, adopt screw spinning machine, PLA's melting point is 175 degrees, and the spinning case adopts the heat medium of low boiling to make to be fit for with PLA, specific operation: drying the raw materials until the water content is lower than 30ppm, setting the premelting temperature of a screw at 200 ℃, setting the outlet temperature of the screw at 215 ℃, setting the temperature of a spinning head at 200 ℃, cooling, winding, cutting into sections and preparing PLA short fibers; the PLA short fiber adopts the fiber with the specification of 4D as the filling material of the heat-preservation core.
(2) Manufacturing a thin non-woven fabric: using PLA fiber as raw material, adopting hot-rolled non-woven fabric equipment to produce: carding PLA fibers, pneumatically feeding the cotton, paving the cotton in a vibrating screen mode, carrying out double-roller hot rolling and forming;
(3) non-woven fabric laminating: the method comprises the following steps of (1) carrying out film spraying on the outside of a package of the thin non-woven fabric, selecting a PBAT material for film spraying, placing pure PBAT slices into a hopper of a film spraying machine, feeding the pure PBAT slices into an extrusion screw to be pushed forwards to a film spraying die head according to set temperatures of all levels, controlling the temperatures of all levels of the screw and the die head by a PLC control instrument of the film spraying machine, setting the temperature of the screw to be six levels, sequentially 160 ℃, 190 ℃, 200 ℃, 223 ℃ and 223 ℃, setting the temperature of the die head to be 223 ℃, setting the traveling speed of the non-woven fabric to be 50 m/min, effectively controlling the thickness;
(4) printing: the laminating layer of the non-woven fabric is printed, so that the laminating layer can effectively prevent water and improve the printing effect;
(5) bag making: the manufacture by a non-woven self-sealing strip bag making machine comprises the following production processes: double-layer non-woven fabric discharging, ultrasonic automatic welding of two sides of a self-sealing strip, folding, automatic installation of a self-sealing strip pull head, ultrasonic transverse ironing, cutting into bags, and leaving cotton filling holes on the side surfaces of the bags.
(6) Filling cotton: with the PLA fibre as heat preservation fibre, fill the intermediate layer of the bag body with heat preservation fibre, filling process: opening and fluffing PLA fiber, automatically sucking into a cotton filling machine, aligning a cotton filling hole of a bag with a cotton filling opening of the cotton filling machine, quantitatively filling cotton, sealing the cotton filling hole, and finishing a thermal insulation bag.
The self-sealing strip described above was the product of example 1.
In order to prevent the adhesion of the film coating surface and the cooling roller, the surface of the cooling roller is provided with a polytetrafluoroethylene contact layer, and the film coating surface is in contact with the polytetrafluoroethylene contact layer of the cooling roller during cooling.
The performance test data for example 3 is shown in the table below
The packaging bag which is completely degradable in the true sense and single in raw material components of the product is produced by optimizing and designing the process, wherein the raw materials are very simple, and other chemical reagents are not added.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (4)
1. A preparation method of a biodegradable self-sealing strip is characterized by comprising the following steps: according to the proportion of 20-40% of PLA and PBAT: preparing a mixture in a mass percentage of 60-80%, adding the uniformly mixed mixture into a screw extruder for extrusion molding, plasticizing the mixture by an extrusion screw, molding by a die head, and cooling to obtain a molded self-sealing strip;
the self-sealing strip is provided with a pull head, and the pull head adopts an injection molding process: preparing a mixture according to the mass percent of PLA50% + PBAT50%, adding the uniformly mixed mixture into an injection molding machine, setting the screw temperature: the material inlet is at 130 deg.C, 150 deg.C, 160 deg.C, 170 deg.C and the nozzle is at 180 deg.C, and the draft angle of the injection mold is greater than 5 deg. due to the high viscosity of the material.
2. The method for preparing the biodegradable self-sealing strip according to claim 1, which is characterized in that: the extrusion screw and the die head form an angle of 90 degrees, and the outlet of the die head faces downwards so that the self-sealing strip directly enters a cooling water tank for cooling when being extruded.
3. The method for preparing the biodegradable self-sealing strip according to claim 1, which is characterized in that: setting the heating temperature of the extrusion screw: the primary temperature is 135 ℃; the secondary temperature is 145 ℃; the third-stage temperature is 160 ℃; the four-stage temperature is 165 ℃, the four-stage temperature is also the temperature at the position of the extrusion die head, the rotating speed of a screw is 16-18 r/min, and the traction speed is set according to the size of the self-sealing strip.
4. The method for preparing the biodegradable self-sealing strip according to claim 3, which is characterized in that: strand size setting: the section size of the self-sealing strip with the sealing strip buckle is 1.9-2.1mm in thickness and 10.5-11mm in width; the thickness of the hand-press self-sealing strip is 2-2.5mm, and the width is 20-22 mm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811293505.6A CN109627703B (en) | 2018-11-01 | 2018-11-01 | Preparation method of biodegradable self-sealing strip |
| PCT/CN2019/091967 WO2020087944A1 (en) | 2018-11-01 | 2019-06-20 | Preparation method for biodegradable self-sealing strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811293505.6A CN109627703B (en) | 2018-11-01 | 2018-11-01 | Preparation method of biodegradable self-sealing strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109627703A CN109627703A (en) | 2019-04-16 |
| CN109627703B true CN109627703B (en) | 2020-12-01 |
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| CN201811293505.6A Active CN109627703B (en) | 2018-11-01 | 2018-11-01 | Preparation method of biodegradable self-sealing strip |
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| CN (1) | CN109627703B (en) |
| WO (1) | WO2020087944A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109627703B (en) * | 2018-11-01 | 2020-12-01 | 江苏云之尚节能科技有限公司 | Preparation method of biodegradable self-sealing strip |
| CN110591197A (en) * | 2019-08-28 | 2019-12-20 | 德清尚邑塑料制品有限公司 | Bone strip production process |
| CN110921099B (en) * | 2019-11-26 | 2021-12-07 | 江苏金之虹新材料有限公司 | High-barrier biodegradable self-supporting bag and preparation method thereof |
| CN110884160A (en) * | 2019-11-28 | 2020-03-17 | 江苏云之尚节能科技有限公司 | Preparation method of biodegradable flowerpot |
| CN113956488B (en) * | 2021-11-24 | 2022-11-15 | 江苏科技大学 | PBAT-based self-reinforced elastomer and preparation method and application thereof |
| CN114851672B (en) * | 2022-07-07 | 2022-09-02 | 山东兰德英科新材料科技有限公司 | Method for preparing infusion bag by adopting biodegradable infusion bag special material |
| CN115216126B (en) * | 2022-08-19 | 2023-11-07 | 山东道恩降解材料有限公司 | Full-degradable self-sealing bag with high repeated use rate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5004356A (en) * | 1988-11-29 | 1991-04-02 | Idemitsu Petrochemical Co., Ltd. | Fastener and wrapping bag having the same |
| CN106147144A (en) * | 2015-05-12 | 2016-11-23 | 荣有限公司 | Soft PET-G resin combination and use its mantle manufactured and zippered bag slide fastener |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE20321475U1 (en) * | 2003-05-23 | 2007-08-09 | Kuhne Anlagenbau Gmbh | Smokable surface or tubular food casing or film for food packaging |
| US6984426B2 (en) * | 2003-06-02 | 2006-01-10 | Cortec Corporation | Biodegradable bag |
| CN103980554B (en) * | 2014-05-30 | 2015-05-13 | 淮北丰盛泰重工有限公司 | Synthetic paper |
| CN104530596B (en) * | 2014-12-24 | 2016-09-28 | 浙江理工大学 | A kind of method utilizing activated sludge to produce degradation plastic |
| CN106400527A (en) * | 2015-08-03 | 2017-02-15 | 上海亚都塑料有限公司 | Antimicrobial braided fabric |
| CN107629443B (en) * | 2017-08-04 | 2020-09-01 | 浙江新恒泰新材料有限公司 | Microcellular foamed conductive thermoplastic elastomer material with pressure-sensitive characteristic and production method thereof |
| CN109627703B (en) * | 2018-11-01 | 2020-12-01 | 江苏云之尚节能科技有限公司 | Preparation method of biodegradable self-sealing strip |
-
2018
- 2018-11-01 CN CN201811293505.6A patent/CN109627703B/en active Active
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2019
- 2019-06-20 WO PCT/CN2019/091967 patent/WO2020087944A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5004356A (en) * | 1988-11-29 | 1991-04-02 | Idemitsu Petrochemical Co., Ltd. | Fastener and wrapping bag having the same |
| CN106147144A (en) * | 2015-05-12 | 2016-11-23 | 荣有限公司 | Soft PET-G resin combination and use its mantle manufactured and zippered bag slide fastener |
Non-Patent Citations (1)
| Title |
|---|
| PLA/PBAT复合材料的结构与性能;林强等;《塑料》;20161231;第45卷(第3期);第65-67页 * |
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| Publication number | Publication date |
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| CN109627703A (en) | 2019-04-16 |
| WO2020087944A1 (en) | 2020-05-07 |
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