CN110936687A - Low-glossiness anaerobic biodegradable biaxially oriented polypropylene film - Google Patents
Low-glossiness anaerobic biodegradable biaxially oriented polypropylene film Download PDFInfo
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- CN110936687A CN110936687A CN201911278349.0A CN201911278349A CN110936687A CN 110936687 A CN110936687 A CN 110936687A CN 201911278349 A CN201911278349 A CN 201911278349A CN 110936687 A CN110936687 A CN 110936687A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- 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
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- 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
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/242—All polymers belonging to those covered by group B32B27/32
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/21—Anti-static
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/716—Degradable
- B32B2307/7163—Biodegradable
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/16—Biodegradable polymers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2400/00—Characterised by the use of unspecified polymers
- C08J2400/16—Biodegradable polymers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2401/02—Cellulose; Modified cellulose
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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Abstract
The invention relates to a low-glossiness anaerobic biodegradable biaxially oriented polypropylene film and a manufacturing method thereof, belonging to the technical field of polypropylene film processing. The anti-sticking agent comprises an upper surface layer, a core layer and a lower surface layer, wherein the raw materials of the upper surface layer comprise 96.5-98% of polypropylene, 1.5-2.5% of an anti-sticking agent and 0.5-1.0% of an anaerobic biodegradation chemical auxiliary agent according to weight percentage; the core layer comprises 93-97.5 wt% of homopolymerized polypropylene, 1.0-3.0 wt% of antistatic agent, 1.0-3.0 wt% of slipping agent and 0.5-1.0 wt% of anaerobic biodegradation chemical auxiliary agent; the raw materials of the lower surface layer respectively comprise 99.0 to 99.5 weight percent of matte material and 0.5 to 1.0 weight percent of anaerobic biodegradation chemical auxiliary agent. The film prepared by the invention does not change the function and appearance of the existing BOPP, and the decomposition products of water, carbon dioxide, methane and humus do not have any harm to the environment.
Description
Technical Field
The invention relates to a low-glossiness anaerobic biodegradable biaxially oriented polypropylene film and a manufacturing method thereof, belonging to the technical field of biaxially oriented polypropylene film processing.
Background
The existing plastic waste treatment modes generally comprise four modes: traditionally, burying, incinerating, recycling and composting. Researches have proved that the plastic takes more than four hundred years to be slowly decomposed, so that the traditional burying and composting can not fundamentally solve the environmental pollution. Incineration of waste plastics generates large amounts of carbon dioxide and toxic gases, which aggravate environmental pollution and greenhouse effect. More importantly, the above treatment method is limited to the case where the waste plastics are collected. Biaxially oriented polypropylene film (i.e. BOPP film) is widely used as an excellent packaging material for stationery, photo album, clothing, cigarette, cake, ice-lolly, etc. The sporadic nature of its packaging and the uncertainty of its use render it essentially useless after use and impossible to collect or completely collect. The degradation of the degradable BOPP film is imperative, and a plurality of achievements are obtained at present, particularly in the aspects of photodegradation and biodegradation, but the photodegradation can only occur in places with light, and has certain limitation. Biodegradation is achieved by adding modified starch, but it has some influence on the function and appearance of the product, and some products are difficult to finally decompose. Oxidative degradation is degraded under an aerobic condition, but the additive is metal salt polluted soil, most importantly, the degradation has a certain period, strict requirements are imposed on the service period of a product, waste materials in the production process cannot be recycled, and the method cannot be popularized in a large range. The ideal biodegradable plastic is a high molecular material which has excellent service performance, can be completely decomposed by environmental microorganisms after being discarded and finally becomes inorganic to become a component of carbon circulation in nature, and the anaerobic biodegradation is a plastic which is degraded by the action of microorganisms existing in nature, such as bacteria, mould (fungi) and algae. Therefore, the development and production of the anaerobic biodegradable BOPP novel film are great tendency in China and abroad, and are the needs of human living environment.
Disclosure of Invention
The invention provides a low-glossiness anaerobic biodegradable biaxially oriented polypropylene film and a manufacturing method thereof, the film is nontoxic, does not degrade in a normal storage environment, does not influence the service cycle of a product, does not change the function and the appearance of the conventional BOPP, and does not harm the environment due to the decomposition products of water, carbon dioxide, methane and humus.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the anaerobic biodegradable biaxially oriented polypropylene film with low glossiness comprises an upper surface layer, a core layer and a lower surface layer, wherein the raw materials of the upper surface layer comprise 96.5-98% of polypropylene, 1.5-2.5% of an anti-sticking agent and 0.5-1.0% of an anaerobic biodegradation chemical auxiliary agent in percentage by weight; the core layer comprises 93-97.5 wt% of homopolymerized polypropylene, 1.0-3.0 wt% of antistatic agent, 1.0-3.0 wt% of slipping agent and 0.5-1.0 wt% of anaerobic biodegradation chemical auxiliary agent; the raw materials of the lower surface layer respectively comprise 99.0 to 99.5 weight percent of matte material and 0.5 to 1.0 weight percent of anaerobic biodegradation chemical auxiliary agent.
The anti-sticking agent in the upper surface layer and the anti-sticking agent in the lower surface layer are both synthetic silica anti-sticking agents; the polypropylene in the upper surface layer is one of homo-polypropylene or co-polypropylene; the melt index ranges of the homopolymerized polypropylene selected for the upper surface layer and the core layer are both 2.6-3.2g/10 min.
The matte material of the lower surface layer is a melt shear of high-melt index polypropylene and low-melt index LDPE according to the mass ratio of 55: 45; the polypropylene of the matte material is homopolymerized polypropylene, and the melt index range of the polypropylene is 2.6-3.2g/10min
The antistatic agent is an alkylamine antistatic agent; the slipping agent is erucic acid amide slipping agent and is a conventional additive for BOPP.
The anaerobic biodegradation chemical auxiliary agent is a melt blend of aliphatic and aromatic polyester, modified plant cellulose and homo-polypropylene, and the blend of the anaerobic biodegradation chemical auxiliary agent comprises the following components in percentage by mass: 5% of aliphatic and aromatic polyester, 4% of modified plant cellulose and the balance of homopolymerized polypropylene.
The modified plant cellulose is a modified esterification product of natural plant cellulose, and the particle size of the modified plant cellulose is required to be less than or equal to 2 mu m.
The thickness of the upper surface layer is 1.0 μm, the thickness of the core layer is 10.0-58.0 μm, and the thickness of the lower surface layer is 2.0-3.0 μm.
A method for manufacturing a low-glossiness anaerobic biodegradable biaxially oriented polypropylene film comprises the following steps:
⑴ feeding, namely feeding the components of the upper surface layer, the core layer and the lower surface layer into the corresponding twin-screw extruders in proportion.
⑵ is extruded and plasticized at the low temperature of 230 ℃ and 250 ℃.
⑶ cooling the cast sheet, wherein the water temperature of the chill roll is controlled at 38-40 deg.C, and the water temperature of the water tank is controlled at 38-40 deg.C.
⑷ and stretching in longitudinal direction at a stretch ratio of 4.5-5.0.
⑸ and stretching in transverse direction with stretching ratio of 9.5-12.0.
⑹ drawing, measuring thickness, corona treatment, and ensuring the film has a wetting tension of more than 38 dyne/cm.
⑺ and rolling.
⑻ aging for 48 hours, standing for 48 hours at 35 deg.C.
The key point is that the aliphatic and aromatic polyester anaerobic auxiliary agent is added into the BOPP film, and the BOPP film is introduced into a biodegradation stage through chemical activity caused by bacteria and is decomposed into water, carbon dioxide, methane and humus substances. The modified plant cellulose added in the product improves the growth speed of microorganisms and accelerates the final decomposition of the product into carbon dioxide, water and methane.
In addition, the physical properties of the product are not influenced by the addition of the anaerobic biodegradation chemical auxiliary agent, and no bacteria exist in an aerobic environment before the product is discarded, so that the degradation activity does not occur, and the service cycle is not influenced, wherein the addition proportion of the anaerobic biodegradation chemical auxiliary agent is 1%, and the degradation cycle is 3-4 years in a composting environment.
The invention adopts the low-temperature extrusion process of 230-250 ℃ by utilizing the advantages of the double-screw extruder, is beneficial to the full melting and dispersion of the biodegradation agent and is not easy to lose effectiveness by thermal cracking.
The total content of the added active ingredients is lower than 1000ppm, and the organic auxiliary agent does not change the appearance and the function of the common BOPP, so the invention is an adding process and can be produced on the existing German Brukner biaxial tension line.
Compared with the common biaxially oriented polypropylene film, the low-glossiness anaerobic biodegradable biaxially oriented polypropylene film prepared by the invention has no great change in appearance and physical property, and is obviously faster in decomposition under high-density anaerobic conditions than the common biaxially oriented polypropylene film (the test standard is ASTM D5511).
The anti-sticking agent in the upper surface layer is a synthetic silica anti-sticking agent which is manufactured by Suzhou Constantum company and has the model number AB6018CPP or AB6018 PP; the lower surface layer Matt material is a Matt material which is produced by the company and has the model number of Matt 002.
The invention has the following remarkable advantages:
(1) the polypropylene film prepared by the invention has excellent service performance before being discarded, and is biodegraded after being discarded. The use period is controllable. Meanwhile, the addition process is adopted, so that the existing equipment and the performance of raw materials are not required to be changed. The manufacturing cost is low.
(2) The added aliphatic and aromatic polyesters are embedded into the polypropylene molecular chain in the processing process, so that the polypropylene molecular chain is expanded and broken in an anaerobic environment, and the aliphatic and aromatic polyesters can absorb bacteria to cause chemical reaction so that the polypropylene reacts into CH4And CO2。Thereby preparing an environment-friendly typeA degradable polypropylene film.
Detailed Description
The present invention will be further illustrated by the following specific examples, but the present invention is not limited to the following examples.
Example 1:
the low-gloss anaerobic biodegradable biaxially oriented polypropylene film is prepared by selecting components with the weight percentages of 96.5 percent of homopolymerized polypropylene, 2.5 percent of anti-sticking agent, 2.5 percent of AB6018PP and 1.0 percent of anaerobic biodegradable agent on the upper surface layer, and the melt index range of the homopolymerized polypropylene is 2.6-3.2g/10 min. The core layer is prepared from 93 wt% of homopolymerized polypropylene, 3.0 wt% of antistatic agent, 3.0 wt% of slipping agent and 1.0 wt% of anaerobic biodegradation agent, and the melt index range of the homopolymerized polypropylene is 2.6-3.2g/10 min. The antistatic agent is an alkylamine antistatic agent; the slipping agent is erucamide slipping agent. The lower surface layer is prepared from 99.0 percent of matte material and 1.0 percent of anaerobic biodegradation agent by weight percentage, and the melt index range of the homopolymerized polypropylene is 2.6-3.2g/10 min. The thickness of the upper surface layer was controlled to 1.0. mu. and the thickness of the core layer was controlled to 26.5. mu. and the thickness of the lower surface layer was controlled to 2.5. mu. The anaerobic biodegradation agent is a melt blend of aliphatic and aromatic polyester, modified plant cellulose and homopolymerized polypropylene, wherein the percentage content of the aliphatic and aromatic polyester in the blend is 5%, the percentage content of the modified plant cellulose in the blend is 4%, the particle size of the modified plant cellulose is less than or equal to 2 mu m, and the balance is the homopolymerized polypropylene.
The specific manufacturing method is as follows:
⑴ feeding, the components of the upper surface layer, the core layer and the lower surface layer are respectively fed into the corresponding twin-screw extruders.
⑵ extrusion and plasticization, the components are melted and extruded in a double-screw extruder under the temperature condition of 240 ℃.
⑶ cooling the cast sheet, extruding the melt from the extruder through a flat film opening gap, cooling the melt into a thick sheet through a chill roll and a water tank, wherein the gap of the die is 2.5mm, the water temperature of the chill roll is controlled at 38 ℃, and the water temperature of the water tank is controlled at 40 ℃.
⑷ longitudinal stretching, preheating the slab at 130 deg.C for 28 seconds, stretching 4.8 times at 125 deg.C, and setting at 130 deg.C for 1.0 second.
⑸ transverse stretching the slab was preheated at 170 ℃ for 7 seconds in a transverse stretcher, transversely stretched 10.0 times at 157 ℃ and set at 170 ℃ for 7 seconds.
⑹ drawing, drawing speed is 380m/min, thickness is measured, corona treatment is carried out, and the film wetting tension is ensured to be equal to 38 dyne.
⑺ rolling, and rolling the film under proper tension to obtain semi-finished product.
⑻ aging for three days, standing for 48 hours (stress relaxation and additive migration) at a temperature of 35 deg.C.
Example 2:
the low-gloss anaerobic biodegradable biaxially oriented polypropylene single-sided heat-sealing film is prepared by selecting components with the weight percentages of 97.0 percent of copolymerized polypropylene, 2.0 percent of anti-sticking agent AB6018PPCPP and 1.0 percent of anaerobic biodegradable agent, and the melt index range of the copolymerized polypropylene is 3.0-6.0g/10 min. The core layer is prepared from 95 wt% of homopolymerized polypropylene, 2.0 wt% of antistatic agent, 2.0 wt% of slipping agent and 1.0 wt% of anaerobic biodegradation agent, and the melt index range of the homopolymerized polypropylene is 2.6-3.2g/10 min. The antistatic agent is an alkylamine antistatic agent; the slipping agent is erucamide slipping agent. The lower surface layer is prepared from 99.0 percent of matte material and 1.0 percent of anaerobic biodegradation agent by weight percentage, and the melt index range of the homopolymerized polypropylene is 2.6-3.2g/10 min. The thickness of the upper surface layer was controlled to 1.0. mu. and the thickness of the core layer was controlled to 21.6. mu. and the thickness of the lower surface layer was controlled to 2.4. mu. The anaerobic biodegradation agent is a melt blend of aliphatic and aromatic polyester, modified plant cellulose and homopolymerized polypropylene, wherein the percentage content of the aliphatic and aromatic polyester in the blend is 5%, the percentage content of the modified plant cellulose in the blend is 4%, the particle size of the modified plant cellulose is less than or equal to 2 mu m, and the balance is the homopolymerized polypropylene.
The specific manufacturing method is as follows:
⑴ feeding, the components of the upper surface layer, the core layer and the lower surface layer are respectively fed into the corresponding twin-screw extruders.
⑵ extrusion and plasticization, the components are melt extruded in a double-screw extruder at the temperature of 230 ℃.
⑶ cooling the cast sheet, extruding the melt from the extruder through a flat film opening gap, cooling the melt into a thick sheet through a chill roll and a water tank, wherein the gap of the die is 2.7mm, the water temperature of the chill roll is controlled at 35 ℃, and the water temperature of the water tank is controlled at 40 ℃.
⑷ longitudinal stretching, preheating the slab at 128 deg.C for 35 seconds, stretching 4.8 times at 120 deg.C, and setting at 128 deg.C for 1.8 seconds.
⑸ transverse stretching the slab was preheated at 170 ℃ for 8.8 seconds in a transverse stretcher, transversely stretched 10.0 times at 156 ℃ and set at 165 ℃ for 8.8 seconds.
⑹ drawing speed is 330m/min, thickness is measured, corona treatment is carried out, and the film wetting tension is ensured to be equal to 38 dyne/cm.
⑺ rolling, and rolling the film under proper tension to obtain semi-finished product.
⑻ aging for three days, standing for 3 days (stress relaxation and additive migration) at 35 deg.C.
Example 3:
the low-gloss anaerobic biodegradable biaxially oriented polypropylene film is prepared by selecting components with the weight percentages of 97.0 percent of homopolymerized polypropylene, 2.0 percent of anti-sticking agent, 2.0 percent of AB6018PP and 1.0 percent of anaerobic biodegradable agent, and the melt index range of the homopolymerized polypropylene is 2.6-3.2g/10 min. The core layer is prepared from 95 wt% of homopolymerized polypropylene, 2.0 wt% of antistatic agent, 2.0 wt% of slipping agent and 1.0 wt% of anaerobic biodegradation agent, and the melt index range of the homopolymerized polypropylene is 2.6-3.2g/10 min. The antistatic agent is an alkylamine antistatic agent; the slipping agent is erucamide slipping agent. The lower surface layer is prepared from 99.0 percent of matte material and 1.0 percent of anaerobic biodegradation agent by weight percentage, and the melt index range of the homopolymerized polypropylene is 2.6-3.2g/10 min. The thickness of the upper surface layer is controlled to be 1.0 mu, the thickness of the core layer is controlled to be 11.0 mu, and the thickness of the lower surface layer is controlled to be 3.0 mu. The anaerobic biodegradation agent is a melt blend of aliphatic and aromatic polyester, modified plant cellulose and homopolymerized polypropylene, wherein the percentage content of the aliphatic and aromatic polyester in the blend is 5%, the percentage content of the modified plant cellulose in the blend is 4%, the particle size of the modified plant cellulose is less than or equal to 2 mu m, and the balance is the homopolymerized polypropylene.
The specific manufacturing method is as follows:
⑴ feeding, the components of the upper surface layer, the core layer and the lower surface layer are respectively fed into the corresponding twin-screw extruders.
⑵ extrusion and plasticization, the components are melted and extruded in a double-screw extruder under the temperature condition of 240 ℃.
⑶ cooling the cast sheet, extruding the melt from the extruder through a flat film opening gap, cooling the melt into a thick sheet through a chill roll and a water tank, wherein the gap of the die is 2.5mm, the water temperature of the chill roll is controlled at 40 ℃, and the water temperature of the water tank is controlled at 40 ℃.
⑷ longitudinal stretching, preheating the slab at 130 deg.C for 31 s, stretching 4.8 times at 125 deg.C, and setting at 130 deg.C for 1.6 s.
⑸ transverse stretching the slab was preheated at 168 deg.C for 7.7 seconds in a transverse stretcher, transversely stretched 10.0 times at 156 deg.C, and set at 167 deg.C for 7.7 seconds.
⑹ drawing speed is 400m/min, thickness is measured, corona treatment is carried out, and the film wetting tension is ensured to be equal to 38 dyne/cm.
⑺ rolling, and rolling the film under proper tension to obtain semi-finished product.
⑻ aging for 48 hours, standing for 48 hours (stress relaxation and additive migration) at 35 deg.C.
Table 1: the comparative inspection data of the low-glossiness anaerobic biodegradable biaxially oriented polypropylene film embodiment 1 and the general product are as follows:
(Note: the inspection data is measured three days after aging, the same applies hereinafter)
Table 2: the comparative inspection data of the low-glossiness anaerobic biodegradable biaxially oriented polypropylene film embodiment 2 and the general product are as follows:
table 3: the comparative inspection data of the low-gloss anaerobic biodegradable biaxially oriented polypropylene film of the invention embodiment 3 and the general product are as follows:
the materials and additives corresponding to the comparative products are the same, and the testing instruments are the same.
As can be seen from tables 1, 2 and 3, compared with the general biaxially oriented polypropylene film, the low-gloss anaerobic biodegradable biaxially oriented polypropylene film of the present invention has no deterioration in physical properties due to the addition of the biodegradable agent, and has no influence on the function. The anaerobic biodegradable biaxially oriented polypropylene film is obviously higher in decomposition speed than the general biaxially oriented polypropylene film in biological decomposition.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (8)
1. The anaerobic biodegradable biaxially oriented polypropylene film with low glossiness comprises an upper surface layer, a core layer and a lower surface layer, and is characterized in that: the raw materials of the upper surface layer comprise 96.5-98% of polypropylene, 1.5-2.5% of anti-sticking agent and 0.5-1.0% of anaerobic biodegradation chemical auxiliary agent according to weight percentage; the core layer comprises 93-97.5 wt% of homopolymerized polypropylene, 1.0-3.0 wt% of antistatic agent, 1.0-3.0 wt% of slipping agent and 0.5-1.0 wt% of anaerobic biodegradation chemical auxiliary agent; the raw materials of the lower surface layer respectively comprise 99.0 to 99.5 weight percent of matte material and 0.5 to 1.0 weight percent of anaerobic biodegradation chemical auxiliary agent.
2. The low gloss anaerobic biodegradable biaxially oriented polypropylene film according to claim 1, wherein: the anti-sticking agent in the upper surface layer and the anti-sticking agent in the lower surface layer are both synthetic silica anti-sticking agents; the polypropylene in the upper surface layer is one of homo-polypropylene or co-polypropylene.
3. The low gloss anaerobic biodegradable biaxially oriented polypropylene film according to claim 1, wherein: the matte material in the lower surface layer is a molten shear of two high-melt index polypropylenes and a low-melt index LDPE.
4. The low gloss anaerobic biodegradable biaxially oriented polypropylene film according to claim 1, wherein: the antistatic agent is an alkylamine antistatic agent; the slipping agent is erucamide slipping agent.
5. The low gloss anaerobic biodegradable biaxially oriented polypropylene film according to claim 1, wherein: the anaerobic biodegradation chemical auxiliary agent is a melt blend of aliphatic and aromatic polyesters, modified plant cellulose and homo-polypropylene, wherein the percentage content of the aliphatic and aromatic polyesters in the blend is 5%, the percentage content of the modified plant cellulose in the blend is 4%, and the balance is the homo-polypropylene.
6. The low gloss anaerobic biodegradable biaxially oriented polypropylene film according to claim 5, wherein: the modified plant cellulose is a natural plant cellulose modified esterification product, and the particle size of the modified plant cellulose is required to be less than or equal to 2 mu m.
7. The low gloss anaerobic biodegradable biaxially oriented polypropylene film according to claim 1, wherein: the thickness of the upper surface layer is 1.0 μm, the thickness of the core layer is 10.0-58.0 μm, and the thickness of the lower surface layer is 2.0-3.0 μm.
8. A method for manufacturing the anaerobic biodegradable biaxially oriented polypropylene film according to claim 1, which comprises the steps of:
⑴ feeding, namely feeding the components of the upper surface layer, the core layer and the lower surface layer into respective corresponding double-screw extruders in proportion;
⑵ is extruded and plasticized at the low temperature of 230 ℃ and 250 ℃;
⑶ cooling the cast sheet, wherein the water temperature of the chill roll is controlled at 38-40 deg.C, and the water temperature of the water tank is controlled at 38-40 deg.C;
⑷ longitudinal stretching, the stretching ratio is 4.5-5.0;
⑸ transverse stretching, wherein the stretching ratio is 9.5-12.0;
⑹ drawing, measuring thickness, performing corona treatment to ensure the film wetting tension is more than 38 dyne/cm when in use;
⑺ rolling;
⑻ aging for 48 hours, standing for 48 hours at 35 deg.C.
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