CN114940876A - Transverse easily-broken adhesive tape and preparation method thereof - Google Patents
Transverse easily-broken adhesive tape and preparation method thereof Download PDFInfo
- Publication number
- CN114940876A CN114940876A CN202210640444.6A CN202210640444A CN114940876A CN 114940876 A CN114940876 A CN 114940876A CN 202210640444 A CN202210640444 A CN 202210640444A CN 114940876 A CN114940876 A CN 114940876A
- Authority
- CN
- China
- Prior art keywords
- polylactic acid
- layer
- adhesive tape
- transverse
- polyvinyl alcohol
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000002390 adhesive tape Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims description 16
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 36
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 36
- 239000002344 surface layer Substances 0.000 claims abstract description 33
- 239000010410 layer Substances 0.000 claims abstract description 30
- 239000004626 polylactic acid Substances 0.000 claims abstract description 29
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 27
- 229920001046 Nanocellulose Polymers 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 17
- 229920006381 polylactic acid film Polymers 0.000 claims abstract description 17
- 239000012792 core layer Substances 0.000 claims abstract description 16
- 229920002472 Starch Polymers 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims abstract description 9
- 239000008107 starch Substances 0.000 claims abstract description 9
- 241000208202 Linaceae Species 0.000 claims abstract description 7
- 235000004431 Linum usitatissimum Nutrition 0.000 claims abstract description 7
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims abstract description 3
- 239000000758 substrate Substances 0.000 claims abstract 6
- 239000000463 material Substances 0.000 claims description 55
- 238000002156 mixing Methods 0.000 claims description 40
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- 238000007599 discharging Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 13
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 12
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- DWSWCPPGLRSPIT-UHFFFAOYSA-N benzo[c][2,1]benzoxaphosphinin-6-ium 6-oxide Chemical compound C1=CC=C2[P+](=O)OC3=CC=CC=C3C2=C1 DWSWCPPGLRSPIT-UHFFFAOYSA-N 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
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- 230000003068 static effect Effects 0.000 claims description 6
- 239000001384 succinic acid Substances 0.000 claims description 6
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 5
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- 238000001125 extrusion Methods 0.000 claims description 5
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- 239000000853 adhesive Substances 0.000 claims description 4
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- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 3
- 239000007767 bonding agent Substances 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 3
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- 239000004408 titanium dioxide Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims description 2
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- 239000000956 alloy Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 2
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 claims description 2
- AQFWNELGMODZGC-UHFFFAOYSA-N o-ethylhydroxylamine Chemical compound CCON AQFWNELGMODZGC-UHFFFAOYSA-N 0.000 claims description 2
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 claims description 2
- FATBGEAMYMYZAF-UHFFFAOYSA-N oleicacidamide-heptaglycolether Natural products CCCCCCCCC=CCCCCCCCC(N)=O FATBGEAMYMYZAF-UHFFFAOYSA-N 0.000 claims description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 2
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
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- 230000000181 anti-adherent effect Effects 0.000 claims 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims 1
- 238000001132 ultrasonic dispersion Methods 0.000 claims 1
- 230000004888 barrier function Effects 0.000 abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 4
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- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 abstract description 3
- 239000003063 flame retardant Substances 0.000 abstract description 3
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- 238000012360 testing method Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 239000012768 molten material Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
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- 239000004310 lactic acid Substances 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- 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
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
-
- 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
-
- 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
- B29C48/695—Flow dividers, e.g. breaker plates
- B29C48/70—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows
-
- 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
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/793—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling upstream of the plasticising zone, e.g. heating in the hopper
-
- 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
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/84—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders by heating or cooling the feeding screws
- B29C48/845—Heating
-
- 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 discloses a transverse easily-broken adhesive tape, which comprises a substrate layer and a pressure-sensitive adhesive layer covering the surface of the substrate layer, wherein the substrate layer is a polylactic acid film, the polylactic acid film comprises a three-layer structure, and the three-layer structure sequentially comprises an upper surface layer, a core layer and a lower surface layer from top to bottom; the upper surface layer comprises, by mass, 50-95% of polylactic acid, 2-20% of CBET, 3-25% of PBAT-starch composite material and 0.5-4% of functional master batch; the core layer includes: 2-4% of modified titanium dioxide grafted polyvinyl alcohol, 0.1-0.3% of flax gum and 95.7-97.9% of polylactic acid; the lower skin layer includes: 88-95% of polylactic acid, 2-5% of modified lignin-nanocellulose filaments, 0.1-0.3% of polyvinyl alcohol and 2-9% of functional master batch. The degradable polylactic acid film prepared by the invention has higher tensile strength, better oxygen and water vapor barrier property and better flame retardant property, has excellent bonding strength after being prepared into a transverse breakable adhesive tape, does not have the problem of degumming, is environment-friendly and degradable, and expands the application field of the degradable polylactic acid film.
Description
Technical Field
The invention relates to the technical field of adhesive tape preparation, in particular to a transverse easily-broken adhesive tape and a preparation method thereof.
Background
The easy-to-break BOPP adhesive tape is an adhesive tape which is used daily by people and is formed by coating glue on one surface of a rough BOPP film after high-voltage corona treatment, and dividing the rough BOPP film into small rolls after slitting.
The base film of the existing easy-breaking BOPP adhesive tape is mainly made of BOPP and the like, mostly comes from petroleum resources, is non-renewable, is gradually depleted along with the increase of the using amount, is non-degradable in a short time after being used, and can cause the harm of white pollution and micro plastic to the environment. Based on the requirement of plastic limitation, it is urgently needed to develop a degradable biomaterial to replace the traditional BOPP material.
The polylactic acid (PLA) is prepared by using crops such as corn, sugarcane, beet and the like as raw materials, fermenting and extracting the raw materials by microorganisms to prepare lactic acid, and then carrying out the processes of dehydration esterification, cyclization, purification, refining, chain extension and the like. PLA has excellent biodegradability, and can be completely degraded by microorganisms in soil in a short time after being discarded to generate CO 2 And water, and no pollution is caused to the environment. In recent years, polylactic acid (PLA) has become an ideal alternative to petroleum-based polymer materials due to its advantages of good biocompatibility, degradability, processability, and mechanical properties, high stiffness, and good transparency.
At present, although the existing polylactic acid film can meet the basic requirements of being used as a base material of an adhesive tape, the barrier property of the existing polylactic acid film is poor, the barrier property of the existing polylactic acid film to air is not high, and the application range of the existing polylactic acid film is greatly limited. In view of the above, the invention provides an environment-friendly degradable transverse breakable adhesive tape and a preparation method thereof.
Disclosure of Invention
The invention aims to provide a transverse easily-broken adhesive tape and a preparation method thereof, and aims to solve the problems that the adhesive tape is not degradable and has poor air and grease barrier property in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a transverse easily-broken adhesive tape comprises a base material layer and a pressure-sensitive adhesive layer covering the surface of the base material layer, wherein the base material layer is a polylactic acid membrane, the polylactic acid membrane comprises a three-layer structure, and the three-layer structure sequentially comprises an upper surface layer, a core layer and a lower surface layer from top to bottom; in terms of mass percentage, the weight percentage of the alloy is,
the upper surface layer comprises 50-95% of polylactic acid, 2-20% of CBET, 3-25% of PBAT-starch composite material and 0.5-4% of functional master batch;
the core layer includes: 2-4% of modified titanium dioxide grafted polyvinyl alcohol, 0.1-0.3% of flax gum and 95.7-97.9% of polylactic acid;
the lower skin layer includes: 88-95% of polylactic acid, 2-5% of modified lignin-nanocellulose filaments, 0.1-0.3% of polyvinyl alcohol and 2-9% of functional master batch;
wherein the functional masterbatch comprises: 0.5-5% of slipping agent, 0.5-1% of anti-bonding agent, 0.5-3% of antistatic agent, 0.3-0.8% of compatilizer and 92-95% of polylactic acid.
Preferably, the PBAT-starch composite material is prepared by drying PBAT and thermoplastic starch at 75-80 ℃ for 18-24 hours, and then mixing the PBAT and the thermoplastic starch in a mass ratio of 2-6: and 4, blending, extruding and granulating by a double-screw extruder, and drying at 75-80 ℃.
Preferably, the content of the anti-bonding agent on the upper surface layer is 800-2000 ppm; the content of the slipping agent on the upper surface layer is 800-1500 ppm.
Preferably, the anti-caking agent is one or a combination of more than two of talcum powder, polymethyl methacrylate microspheres and polystyrene microspheres; the slipping agent is one or the combination of more than two of erucamide, silicone and ethylene bis stearamide; the compatilizer is a compatilizer ADR; the antistatic agent is one of ethoxyamine and oleamide.
Preferably, the modified TiO 2 The preparation of the grafted polyvinyl alcohol comprises the following specific steps: (1) mixing the titanium dioxide sol and graphene oxide, calcining, and reducing by sodium borohydride to obtain modified titanium dioxide; (2) adding polyvinyl alcohol into deionized water and stirringFully dissolving the modified titanium dioxide powder, adding the modified titanium dioxide powder into deionized water, stirring at room temperature to fully disperse the modified titanium dioxide powder, slowly pouring the modified titanium dioxide powder into a polyvinyl alcohol solution, ultrasonically dispersing, vacuumizing and defoaming at room temperature for 0.5-1 h to obtain modified titanium dioxide grafted polyvinyl alcohol; wherein the mass ratio of the polyvinyl alcohol to the modified titanium dioxide powder is 1: 0.2-0.3, and the concentration of the polyvinyl alcohol solution is 190-300 g/L.
Preferably, the preparation of the modified lignin-nanocellulose filaments comprises the following specific steps: (1) reacting DOPO and succinic acid for 4-5 h at 120-130 ℃ under the protection of nitrogen by using dimethylbenzene as a solvent to obtain a material A, wherein the molar ratio of DOPO to succinic acid is 1-1.5: 2; (2) with K 2 CO 3 Adding the material A into a lignin-nanocellulose dispersion liquid as a catalyst, reacting at 120-130 ℃ for 5-7 h, performing suction filtration, washing and drying to obtain modified lignin-nanocellulose; wherein, K 2 CO 3 The addition amount of the lignin-nano cellulose filament is 15-20 wt% of the mass of the lignin-nano cellulose filament, and the molar ratio of the lignin-nano cellulose filament to the material A is 1-2: 4.
the invention also aims to provide a preparation method of the transverse easy-breaking adhesive tape, which comprises the following steps:
s1, heating and melting the raw materials of the upper surface layer, the core layer and the lower surface layer in an extruder respectively, then converging in a three-layer T-shaped die head and extruding to obtain a mixed melt, and applying the extruded mixed melt on the surface of a chill roll with the surface temperature of 25-38 ℃ for quenching to form a cast sheet;
s2, preheating the obtained cast sheet at 55-70 ℃ and then carrying out longitudinal stretching treatment;
s3, preheating the film obtained in the step S2 at 50-65 ℃, and then carrying out transverse stretching treatment;
s4, performing heat setting treatment on the film obtained in the step S3 at 110-125 ℃, and then performing corona treatment;
and S5, coating the acrylate emulsion on the surface of the corona layer of the polylactic acid film obtained in the step S4, drying and slitting to obtain the transverse easily-broken adhesive tape.
Preferably, in step S1, the heating and melting temperature is 180 to 190 ℃; the temperature of the T-shaped die head is 195-200 ℃.
Preferably, the stretching ratio of the longitudinal stretching treatment is 2.8-3.2, and the stretching ratio of the transverse stretching treatment is 2.6-3.0.
Preferably, in S1, the extruder includes a vertically disposed housing and a multi-section rotating body detachably and rotatably sleeved in the housing; the multi-section rotating body comprises a hollow long shaft, and a heating function section, a material mixing section and a material homogenizing and discharging section which are sequentially detachably sleeved on the hollow long shaft from the rear end to the front end; a feeding barrel is communicated with the heating functional section; the heating functional section comprises a heating threaded sleeve sleeved on the hollow long shaft; the heating thread insert is embedded with an electric heating wire and can push the melted materials to the front end; the mixing section comprises at least two base sleeves fixedly sleeved on the hollow long shaft; a plurality of through cavities which are opposite to the central axis of the hollow long shaft and have inclination angles in the axial direction and the radial direction are uniformly formed on the base sleeve around the hollow long shaft; the through cavities on the two base sleeves face opposite directions on the whole; the bottom of the through cavity is communicated with the inside of the hollow long shaft through an electromagnetic valve; one end of an impact block is fixedly provided with a piston; the piston is matched with the through cavity in a sealing sliding sleeve mode; a one-way opening and closing pressure-resistant piece is arranged in a through cavity between the electromagnetic valve and the piston; the one-way opening and closing pressure-resistant piece, the piston and the inner wall of the through cavity are enclosed to form an impact cavity; the impact cavity is internally provided with a conductor and a return spring coated with an insulating material; the return spring is used for returning the piston to the initial position; the impact block is driven to rotate by the recoil force received in the outward pushing process; the homogenizing material discharging section comprises an extrusion threaded sleeve sleeved on the hollow long shaft; high-temperature water is injected into the hollow long shaft.
Preferably, the shell is an expanding part at the position corresponding to the mixing section, and a hedging part is arranged at the position opposite to the impact block; the one-way opening and closing pressure-resistant piece comprises an opening and closing sheet with the diameter slightly smaller than that of the through cavity, an annular stop strip arranged between the opening and closing sheet and the electromagnetic valve and fixed on the inner wall of the through cavity, and a plurality of stop blocks arranged between the opening and closing sheet and the piston and fixed on the inner wall of the through cavity; the opening and closing sheet tightly abuts against the annular barrier strip to close the passage; when the opening and closing piece abuts against the stop block, high-temperature water can enter the impact cavity along the gap between the opening and closing piece and the through cavity and the gap between the stop blocks; one end of the return spring is connected with the piston, and the other end of the return spring is connected with the opening and closing sheet.
Preferably, the hollow long shafts between the heating functional section and the material mixing section and between the material mixing section and the material homogenizing and discharging section are respectively sleeved with variable fan blades; the variable fan blade comprises a fixed shaft sleeve and a plurality of fan-shaped blade blocks which are uniformly and fixedly inserted along the outer circumference of the fixed shaft sleeve; the fan-shaped blade blocks form a circle under a static state; a rigid supporting rod is fixed on one side edge of the fan-shaped blade block; the rigid support rod is fixedly connected with the fixed shaft sleeve; the fan-shaped blade block comprises a high-temperature-resistant insulating elastic plate at the middle part and piezoelectric ceramic plates attached to two surfaces of the high-temperature-resistant insulating elastic plate; applying opposite electric fields to the piezoelectric ceramic plates respectively, wherein one of the two piezoelectric ceramic plates is lengthened and the other one of the two piezoelectric ceramic plates is shortened along the polarization direction, so that the high-temperature-resistant insulating elastic plate bends and deflects to one side of the rigid support rod around the rigid support rod; the variable fan blades can be flexibly switched between material blocking and material extruding at either side.
Preferably, the shell is respectively provided with bearing sleeves in the front end and the rear end; the bearing sleeve is connected with the shell through a plurality of connecting rods; the front end and the rear end of the multi-section rotating body are respectively detachably sleeved with the bearing sleeve in a rotating manner.
Compared with the prior art, the invention has the beneficial effects that:
1. the degradable polylactic acid film prepared by the invention has higher tensile strength, better oxygen and water vapor barrier property and better flame retardant property, has excellent bonding strength after being prepared into a transverse breakable adhesive tape, does not have the problem of degumming, is environment-friendly and degradable, further expands the application field of the adhesive tape, and has wide positive significance for packaging decrement, environment protection and carbon reduction.
2. The extruder disclosed by the invention adopts an innovative design, integrates multiple functions of material conveying, material mixing, extruding and the like, does not need to be driven by a motor, effectively reduces the volume of the extruder, and enables the structure of the extruder to be more compact and small; in addition, the vertical arrangement is adopted, so that not only is the transverse occupied space further saved, but also the gravity effect is skillfully utilized, and the discharging is smoother.
3. The shell and the detachable rotating sleeve are arranged on the multi-section rotating body arranged in the shell, the shell is simply matched with the multi-section rotating body, the detachment and the installation are simple and convenient, the sealing performance is good, the integration degree is high, and the disassembly and the cleaning and the component replacement according to specific needs are convenient; by utilizing the liquid-electric effect, the impact can be instantly and repeatedly generated by a simple and reliable method, and the extrusion and oscillation of the melted material can be realized by utilizing the shock wave, so that on one hand, the uniform mixing of all components in the material can be promoted, on the other hand, the melted material can be more uniform in an impact mode, and the defects of internal bubbles and the like can be eliminated, thereby obtaining a more uniform, pure and high-strength winding film; the impact block can rotate while impacting through the inclination of the impact direction of the impact block, so that the impact block has both impact and stirring effects on the melted materials, and the impact block is combined rigidly and flexibly, thereby further improving the homogenizing and mixing effects of the melted materials; meanwhile, the effect of reversely driving the hollow long shaft to rotate by utilizing the liquid-electric effect is realized, so that the heating function section, the material homogenizing and discharging section and the two variable fan blades are further driven to rotate, the multi-section type rotating body realizes multifunctional integrated linkage, and seamless connection of material melting, mixing and homogenizing and extruding is realized; two sets of impact blocks are arranged oppositely, so that the balance of force and the opposite impact of melted materials can be realized.
4. The variable fan blade provided by the invention integrates the functions of material blocking, material discharging, material returning, flow regulation and the like by utilizing the inverse piezoelectric effect, can be quickly, seamlessly, stably and flexibly regulated according to the process and the requirement, is suitable for different production requirements, has high flexibility, can be skillfully matched with a liquid electric effect mechanism of a mixing section, can improve the uniformity of mixed materials, realizes the purposes of mixing, extruding and hammering in the radial direction and turning in the axial direction, and thus, the mixing uniformity of melted materials is improved by coaction in multiple dimensions, and the forming quality of a winding film is improved.
Drawings
FIG. 1 is a schematic view of the process of the present invention;
FIG. 2 is a schematic view of the structure of the extruder of the present invention;
FIG. 3 is an enlarged view of FIG. 2 taken at the dashed circle;
FIG. 4 is a schematic view of a variable fan blade in a static state;
FIG. 5 is a schematic view of the variable blade deflected to one side;
figure 6 is a cross-sectional schematic view of a fan blade block.
In the figure: 11. a housing; 111. an expanding portion; 112. a hedging section; 113. a bearing housing; 12. a multi-section rotating body; 13. a hollow long shaft; 14. a heating functional section; 141. heating the screw sleeve; 15. a mixing section; 151. a base sleeve; 152. a through cavity; 153. an electromagnetic valve; 154. an impact block; 155. a piston; 156. a one-way opening and closing pressure-resistant part; 1561. opening and closing the sheet; 1562. an annular stop bar; 1563. a stopper; 157. an electrical conductor; 158. a return spring; 16. a material homogenizing and discharging section; 161. extruding a screw sleeve; 17. a variable fan blade; 171. fixing the shaft sleeve; 172. a fan-shaped blade block; 1721. a high temperature resistant insulating elastic plate; 1722. a piezoelectric ceramic plate; 1723. a rigid strut; 18. a dosing barrel.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example 1
Referring to fig. 1, a method for preparing a transverse breakable adhesive tape includes the following steps:
s1, heating and melting the raw materials of the upper surface layer, the core layer and the lower surface layer in an extruder respectively, then converging in a three-layer T-shaped die head and extruding to obtain a mixed melt, and applying the extruded mixed melt on the surface of a chill roll with the surface temperature of 32 ℃ for quenching to form a cast sheet;
wherein the upper surface layer consists of 80 mass percent of polylactic acid, 10 mass percent of CBET, 7 mass percent of PBAT-starch composite material and 3.0 mass percent of functional master batch; the core layer consists of 95.9 percent of polylactic acid, 4 percent of modified titanium dioxide grafted polyvinyl alcohol and 0.1 percent of flax gum; the lower surface layer consists of 88.9 percent of polylactic acid, 5 percent of modified lignin-nano cellulose filaments, 0.1 percent of polyvinyl alcohol and 6 percent of functional master batch; the functional master batch consists of 5 percent of slipping agent, 0.7 percent of anti-caking agent, 1 percent of antistatic agent, 0.3 percent of compatilizer and 93 percent of polylactic acid.
S2, preheating the obtained cast sheet at 55 ℃ and then carrying out longitudinal stretching treatment;
s3, preheating the film obtained in the step S2 at 65 ℃ and then carrying out transverse stretching treatment;
s4, carrying out heat setting treatment on the film obtained in the step S3 at 115 ℃, and then carrying out corona treatment;
s5, coating the acrylate emulsion on the surface of the corona layer of the polylactic acid film obtained in the step S4, drying and cutting to obtain a transverse easily-broken adhesive tape;
wherein the modified TiO 2 The preparation of the grafted polyvinyl alcohol comprises the following specific steps: (1) mixing the titanium dioxide sol and graphene oxide, calcining, and reducing by sodium borohydride to obtain modified titanium dioxide; (2) adding polyvinyl alcohol into deionized water, stirring to fully dissolve the polyvinyl alcohol, adding modified titanium dioxide powder into deionized water, stirring at room temperature to fully disperse the modified titanium dioxide powder, slowly pouring the modified titanium dioxide powder into a polyvinyl alcohol solution, ultrasonically dispersing, vacuumizing and defoaming at room temperature for 0.5h to obtain modified titanium dioxide grafted polyvinyl alcohol; wherein the mass ratio of the polyvinyl alcohol to the modified titanium dioxide powder is 1: 0.2, the concentration of the polyvinyl alcohol solution is 200 g/L.
The preparation method of the modified lignin-nanocellulose filaments comprises the following specific steps: (1) reacting DOPO and succinic acid at 125 ℃ for 4h under the protection of nitrogen by using xylene as a solvent to obtain a material A, wherein the molar ratio of DOPO to succinic acid is 1.5: 2; (2) with K 2 CO 3 Adding the material A into a lignin-nanocellulose dispersion liquid as a catalyst, reacting at 130 ℃ for 6 hours, and then carrying out suction filtration, washing and drying to obtain modified lignin-nanocellulose; wherein, K 2 CO 3 The addition amount of the lignin-nanocellulose filament is 18wt% of the mass of the lignin-nanocellulose filament, and the molar ratio of the lignin-nanocellulose filament to the material A is 1.8: 4.
example 2
A preparation method of a transverse breakable adhesive tape comprises the following steps:
s1, heating and melting the raw materials of the upper surface layer, the core layer and the lower surface layer in an extruder respectively, then converging in a three-layer T-shaped die head and extruding to obtain a mixed melt, and applying the extruded mixed melt on the surface of a chill roll with the surface temperature of 35 ℃ for quenching to form a cast sheet;
wherein the upper surface layer consists of 55% of polylactic acid, 16% of CBET, 25% of PBAT-starch composite material and 4% of functional master batch by mass percentage; the core layer consists of 97.8 percent of polylactic acid, 2 percent of modified titanium dioxide grafted polyvinyl alcohol and 0.2 percent of flax gum; the lower surface layer consists of 92.7 percent of polylactic acid, 3 percent of modified lignin-nanocellulose filaments, 0.3 percent of polyvinyl alcohol and 4 percent of functional master batch;
the remaining steps S2-S5 are the same as in example 1.
Example 3
A preparation method of a transverse breakable adhesive tape comprises the following steps:
s1, heating and melting the raw materials of the upper surface layer, the core layer and the lower surface layer in an extruder respectively, then converging in a three-layer T-shaped die head and extruding to obtain a mixed melt, and applying the extruded mixed melt on the surface of a chill roll with the surface temperature of 28 ℃ for quenching to form a cast sheet;
wherein the upper surface layer consists of 92% of polylactic acid, 2% of CBET, 3% of PBAT-starch composite material and 3% of functional master batch in percentage by mass; the core layer consists of 96.7 percent of polylactic acid, 3 percent of modified titanium dioxide grafted polyvinyl alcohol and 0.3 percent of flax gum; the lower surface layer consists of 94.8 percent of polylactic acid, 3 percent of modified lignin-nano cellulose filaments, 0.2 percent of polyvinyl alcohol and 2 percent of functional master batch;
the remaining steps S2-S5 are the same as in example 1.
Example 4
A preparation method of a transverse breakable adhesive tape comprises the following steps:
s1, heating and melting the raw materials of the upper surface layer, the core layer and the lower surface layer in an extruder respectively, then converging in a three-layer T-shaped die head and extruding to obtain a mixed melt, and applying the extruded mixed melt on the surface of a chill roll with the surface temperature of 38 ℃ for quenching to form a cast sheet;
wherein the upper surface layer consists of 55% of polylactic acid, 16% of CBET, 25% of PBAT-starch composite material and 4% of functional master batch by mass percentage; the core layer consists of 97.8 percent of polylactic acid, 2 percent of modified titanium dioxide grafted polyvinyl alcohol and 0.2 percent of flax gum; the lower surface layer consists of 90.9 percent of polylactic acid, 2 percent of modified lignin-nano cellulose filaments, 0.1 percent of polyvinyl alcohol and 7 percent of functional master batch;
the remaining steps S2-S5 are the same as in example 1.
Comparative example 1
The same procedure as in example 1 was repeated except that the modified titanium dioxide-grafted polyvinyl alcohol was replaced with polyvinyl alcohol, except that the procedure was changed to S2-S5.
Comparative example 2
The same procedure as in example 1 was repeated, except that the lignin-nanocellulose filaments were not modified.
The polylactic acid films prepared in the above examples 1 to 4 and comparative examples 1 to 2 and the finished products of the transverse breakable adhesive tapes were subjected to various performance tests, the test standards are as follows:
(a) tensile property: testing according to GB/T1040.3-2006;
(b) water vapor transmission rate: testing according to GB/T1037-88;
(c) oxygen transmission rate: testing according to GB/T1038-2000 standard;
(d) 180 ° peel strength: testing according to GB/T2792-2014 standard;
(e) the adhesive tape gluing condition is as follows: the adhesive surface of the tape and the backing film were bonded together and peeled at 180 degrees, and the surface of the backing film was observed for the presence of adhesive residue, and if the adhesive residue was observed clearly, the tape was marked as "x", whereas the tape was marked as "o".
The data of the results are shown in Table 1.
TABLE 1
As shown in the table 1, the polylactic acid film prepared by the embodiment of the invention has higher tensile strength, better oxygen and water vapor barrier property and better flame retardant property. The adhesive tape has the advantages of low carbon and environmental protection, has excellent bonding strength after being prepared into the adhesive tape, does not have the problem of degumming, and has wide application prospect.
In conclusion, compared with the prior art, the biaxially oriented polylactic acid film for the adhesive tape provided by the invention has the advantages of high tensile strength, low carbon and environmental friendliness, has excellent bonding strength after being prepared into the adhesive tape, does not have obvious back surface adhesion problem, and has wide application prospect.
In addition, referring to fig. 2 and 3, in the present invention, the extruder adopts a completely new design structure, and the extruder includes a vertically arranged housing 11 and a multi-section type rotator 12 detachably rotatably sleeved in the housing 11; the multi-section rotating body 12 comprises a hollow long shaft 13, and a heating functional section 14, a mixing section 15 and a homogenizing discharging section 16 which are sequentially detachably sleeved on the hollow long shaft 13 from the rear end to the front end; a charging barrel 18 is communicated with the heating functional section 14; the heating functional section 14 comprises a heating threaded sleeve 141 sleeved on the hollow long shaft 13; the heating thread insert 141 is embedded with a heating wire and can push the melted material to the front end; the mixing section 15 comprises at least two base sleeves 151 fixedly sleeved on the hollow long shaft 13; a plurality of through cavities 152 which have inclination angles relative to the central axis of the hollow long shaft 13 in the axial direction and the radial direction are uniformly formed on the base sleeve 151 around the hollow long shaft 13; the through cavities 152 of the two base sleeves 151 are oriented generally oppositely; the bottom of the through cavity 152 is communicated with the interior of the hollow long shaft 13 through an electromagnetic valve 153; a piston 155 is fixedly arranged at one end of an impact block 154; the piston 155 is matched with the through cavity 152 in a sealing sliding sleeved mode; a one-way opening and closing pressure-resistant member 156 is arranged in the through cavity 152 between the electromagnetic valve 153 and the piston 155; the one-way opening and closing pressure-resistant piece 156, the piston 155 and the inner wall of the through cavity 152 are enclosed to form an impact cavity; a conductive body 157 and a return spring 158 coated with an insulating material are arranged in the impact cavity; a return spring 158 for returning the piston 155 to an initial position; the recoil force received in the process of pushing the impact block 154 outwards drives the hollow long shaft 13 to rotate; the homogenizing discharging section 16 comprises an extrusion threaded sleeve 161 sleeved on the hollow long shaft 13; high-temperature water is injected into the hollow long shaft 13.
Furthermore, the shell 11 is provided with an expanding diameter part 111 at the position corresponding to the mixing section 15, and an opposite impact part 112 at the position opposite to the impact block 154; the one-way opening and closing pressure-resistant piece 156 comprises an opening and closing sheet 1561 with the diameter slightly smaller than the through cavity 152, an annular stop bar 1562 arranged between the opening and closing sheet 1561 and the electromagnetic valve 153 and fixed on the inner wall of the through cavity 152, and a plurality of stop blocks 1563 arranged between the opening and closing sheet 1561 and the piston 155 and fixed on the inner wall of the through cavity 152; the opening and closing sheet 1561 closes the passage when abutting against the annular barrier 1562; when the opening and closing piece 1561 abuts against the stopper 1563, the high-temperature water can enter the impact cavity along the gap between the opening and closing piece 1561 and the through cavity 152 and the gap between the stoppers 1563; the return spring 158 has one end connected to the piston 155 and the other end connected to the opening/closing plate 1561.
Referring to fig. 4 to 6, further, the hollow long shaft 14 between the heating functional section 14 and the mixing section 15 and between the mixing section 15 and the homogenizing discharging section 16 is respectively sleeved with a variable fan blade 17; the variable vane 17 includes a fixed boss 171 and a plurality of fan-shaped vane blocks 172 uniformly fixedly inserted along an outer circumference of the fixed boss 171; the plurality of fan-shaped blade pieces 172 form a circle in a static state; a rigid strut 1723 is fixed on one side of the fan-shaped blade block 172; the rigid support rod 1723 is fixedly connected with the fixed shaft sleeve 171; the fan-shaped blade block 172 comprises a high temperature resistant insulating elastic plate 1721 at the middle part and piezoelectric ceramic plates 1722 attached to two sides of the high temperature resistant insulating elastic plate 1721; applying opposite electric fields to the piezoelectric ceramic plates 1722 respectively, so that one of the two piezoelectric ceramic plates 1722 becomes longer and the other one becomes shorter along the polarization directions, thereby bending and deflecting the high-temperature-resistant insulating elastic plate 1721 around the rigid struts 1723 to one side; so that the variable fan blades 17 can be flexibly switched between blocking and extruding on either side.
Further, the high temperature resistant insulating elastic sheet 1721 is a glass fiber sheet or polyimide resin.
Further, bearing sleeves 113 are respectively installed in the shell 11 near the front end and the rear end; the bearing sleeve 113 is connected with the shell 11 by a plurality of connecting rods; the front and rear ends of the multi-section rotating body 12 are detachably and rotatably sleeved with the bearing sleeve 113.
The mixed material melting and extruding method of the extruder comprises the following steps:
firstly, feeding matched material particles into a heating functional section 14 from a feeding barrel 18; at this time, the variable fan blades 17 between the heating functional section 14 and the mixing section 15 are in a closed state in a static state, so that material particles are prevented from falling into the mixing section 15; the heating functional section 14 melts the material;
secondly, the variable fan blades 17 between the heating functional section 14 and the mixing section 15 are controlled by an electric field to bend and deflect, so that the fan-shaped blade blocks 172 are staggered to form gaps, and the melted materials flow downwards into the mixing section 15; at the moment, the variable fan blades 17 between the mixing section 15 and the homogenizing discharging section 16 are in a closed state under a static state;
thirdly, high-temperature water is injected into the hollow long shaft 13, the electromagnetic valve 153 is opened, and the high-temperature water enters the impact cavity along the gap between the opening and closing sheet 1561 and the through cavity 152 and the gap between the stop blocks 1563 and fills the impact cavity; closing the solenoid valve 153;
fourthly, a strong electric field is applied to the high-temperature water through the electric conductor 157, the high-voltage strong electric field passes through the liquid, and the liquid in the channel is quickly vaporized and expanded to cause explosion due to the instant release of huge energy in the discharge channel, so that the impact block 154 is pushed outwards; the plurality of impact blocks 154 act together to melt the raw material, producing a hammering effect; meanwhile, due to the inclined arrangement of the impact block 154, the impact block 154 rotates by the reaction force, so that a stirring effect is generated on the melted raw materials, the hollow long shaft 13 is driven to rotate, the hollow long shaft 13 simultaneously drives the heating screw sleeve 141 to rotate, the melted materials in the heating functional section 14 are further pushed to the mixing section 15, the variable fan blades 17 between the heating functional section 14 and the mixing section 15 are driven to rotate, the melted materials are further extruded to the mixing section 15, and the melted materials which flow towards one side of the heating functional section 14 under impact are pumped back;
controlling the variable fan blades 17 between the mixing section 15 and the homogenizing discharging section 16 to bend and deflect by an electric field, so that the fan-shaped blade blocks 172 are staggered to form gaps, the variable fan blades 17 and the extruding threaded sleeves 161 are driven to rotate simultaneously due to the rotation of the hollow long shaft 13, and the staggered directions of the fan-shaped blade blocks 172 enable the fan-shaped blade blocks to extrude and pump molten materials to the mixing section 15 in the rotating process, so that most of the molten materials are sent back by the extruding pump to be continuously mixed, part of the molten materials flow into the homogenizing discharging section 16 to pass through the extruding threaded sleeves 161, and the molten materials are extruded by the rotating extruding threaded sleeves 161;
sixthly, controlling the deformation of the fan-shaped blade block 172 by voltage and controlling the outflow speed of the melted material; the larger flow is needed only by controlling the reverse deformation of the fan-shaped blade block 172 to enable the extrusion pumping direction of the variable fan blades 17 to face the homogenizing material discharging section 16.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A transverse easily-broken adhesive tape comprises a substrate layer and a pressure-sensitive adhesive layer covering the surface of the substrate layer, and is characterized in that the substrate layer is a polylactic acid film, the polylactic acid film comprises a three-layer structure, and the three-layer structure sequentially comprises an upper surface layer, a core layer and a lower surface layer from top to bottom; in terms of mass percentage, the weight percentage of the alloy is,
the upper surface layer comprises 50-95% of polylactic acid, 2-20% of CBET, 3-25% of PBAT-starch composite material and 0.5-4% of functional master batch;
the core layer includes: 2-4% of modified titanium dioxide grafted polyvinyl alcohol, 0.1-0.3% of flax gum and 95.7-97.9% of polylactic acid;
the lower skin layer includes: 88-95% of polylactic acid, 2-5% of modified lignin-nanocellulose filaments, 0.1-0.3% of polyvinyl alcohol and 2-9% of functional master batch;
wherein the functional masterbatch comprises: 0.5-5% of slipping agent, 0.5-1% of anti-bonding agent, 0.5-3% of antistatic agent, 0.3-0.8% of compatilizer and 92-95% of polylactic acid.
2. The transverse breakable adhesive tape according to claim 1, characterized in that the PBAT-starch composite material is prepared by drying PBAT and thermoplastic starch at 75-80 ℃ for 18-24 h, and then mixing the PBAT and the thermoplastic starch in a mass ratio of 2-6: and 4, blending, extruding and granulating by a double-screw extruder, and drying at 75-80 ℃.
3. The transverse breakable adhesive tape according to claim 2, wherein the content of the anti-adhesive agent in the upper surface layer is 800 to 2000 ppm; the content of the slipping agent on the upper surface layer is 800-1500 ppm; the anti-caking agent is one or the combination of more than two of talcum powder, polymethyl methacrylate microspheres and polystyrene microspheres; the slipping agent is one or the combination of more than two of erucamide, silicone and ethylene bis stearamide; the compatilizer is a compatilizer ADR; the antistatic agent is one of ethoxyamine and oleamide.
4. The transverse breakable adhesive tape according to claim 1, wherein the modified TiO is 2 The preparation of the grafted polyvinyl alcohol comprises the following specific steps: (1) mixing the titanium dioxide sol and graphene oxide, calcining, and reducing by sodium borohydride to obtain modified titanium dioxide; (2) adding polyvinyl alcohol into deionized water, stirring to fully dissolve the polyvinyl alcohol, adding modified titanium dioxide powder into deionized water, stirring at room temperature to fully disperse the modified titanium dioxide powder, slowly pouring the modified titanium dioxide powder into a polyvinyl alcohol solution, performing ultrasonic dispersion, and vacuumizing and defoaming at room temperature for 0.5-1 h to obtain modified titanium dioxide grafted polyvinyl alcohol; wherein the mass ratio of the polyvinyl alcohol to the modified titanium dioxide powder is 1: 0.2-0.3, and the concentration of the polyvinyl alcohol solution is 190-300 g/L.
5. The transverse breakable adhesive tape according to claim 1, wherein the modified lignin-nanocellulose filaments are prepared by the following specific steps: (1) reacting DOPO and succinic acid for 4-5 h at 120-130 ℃ under the protection of nitrogen by using dimethylbenzene as a solvent to obtain a material A, wherein the molar ratio of DOPO to succinic acid is 1-1.5: 2; (2) with K 2 CO 3 Adding the material A into a lignin-nanocellulose dispersion liquid as a catalyst, reacting at 120-130 ℃ for 5-7 h, performing suction filtration, washing and drying to obtain modified lignin-nanocellulose; wherein, K 2 CO 3 The addition amount of the lignin-nanocellulose filament is 15-20 wt% of the mass of the lignin-nanocellulose filament, and the molar ratio of the lignin-nanocellulose filament to the material A is 1-2: 4.
6. a method of making a transverse frangible tape of any of claims 1-5 comprising the steps of:
s1, heating and melting the raw materials of the upper surface layer, the core layer and the lower surface layer in an extruder respectively, then converging in a three-layer T-shaped die head and extruding to obtain a mixed melt, and applying the extruded mixed melt on the surface of a chill roll with the surface temperature of 25-38 ℃ for quenching to form a cast sheet;
s2, preheating the obtained cast sheet at 55-70 ℃ and then carrying out longitudinal stretching treatment;
s3, preheating the film obtained in the step S2 at 50-65 ℃, and then carrying out transverse stretching treatment;
s4, performing heat setting treatment on the film obtained in the step S3 at 110-125 ℃, and then performing corona treatment;
and S5, coating the acrylate emulsion on the surface of the corona layer of the polylactic acid film obtained in the step S4, drying and slitting to obtain the transverse easily-broken adhesive tape.
7. The method for preparing the transverse breakable adhesive tape according to claim 6, wherein in step S1, the temperature of the heating and melting is 180-190 ℃; the temperature of the T-shaped die head is 195-200 ℃; the stretching ratio of the longitudinal stretching treatment is 2.8-3.2, and the stretching ratio of the transverse stretching treatment is 2.6-3.0.
8. The method for preparing the transverse breakable adhesive tape according to claim 6, wherein in step S1, the extruder comprises a vertically arranged housing (11) and a multi-section swivel (12) detachably rotatably sleeved in the housing (11); the multi-section rotating body (12) comprises a hollow long shaft (13), and a heating function section (14), a material mixing section (15) and a material homogenizing and discharging section (16) which are sequentially detachably sleeved on the hollow long shaft (13) from the rear end to the front end; a charging barrel (18) is communicated with the heating functional section (14); the heating functional section (14) comprises a heating threaded sleeve (141) sleeved on the hollow long shaft (13); the heating thread sleeve (141) is embedded with a heating wire and can push the melted materials to the front end; the mixing section (15) comprises at least two base sleeves (151) fixedly sleeved on the hollow long shaft (13); a plurality of through cavities (152) which have inclination angles relative to the central axis of the hollow long shaft (13) in the axial direction and the radial direction are uniformly formed in the base sleeve (151) around the hollow long shaft (13); the through cavities (152) on the two base sleeves (151) face to the opposite directions in general; the bottom of the through cavity (152) is communicated with the interior of the hollow long shaft (13) through an electromagnetic valve (153); one end of an impact block (154) is fixedly provided with a piston (155); the piston (155) is matched with the through cavity (152) in a sealing sliding sleeve mode; a one-way opening and closing pressure-resistant piece (156) is arranged in the through cavity (152) between the electromagnetic valve (153) and the piston (155); the inner walls of the one-way opening and closing pressure-resistant piece (156), the piston (155) and the through cavity (152) are enclosed to form an impact cavity; a conductor (157) and a return spring (158) coated with an insulating material are arranged in the impact cavity; the return spring (158) is used for returning the piston (155) to an initial position; the impact block (154) is driven to rotate by the recoil force received in the outward pushing process; the homogenizing discharging section (16) comprises an extrusion threaded sleeve (161) sleeved on the hollow long shaft (13); high-temperature water is injected into the hollow long shaft (13).
9. The method for preparing a transverse breakable adhesive tape according to claim 8, wherein the housing (11) is provided with an expanded diameter portion (111) at a position corresponding to the mixing section (15), and a counter-impact portion (112) is provided at a position opposite to the impact block (154); the one-way opening and closing pressure-resistant piece (156) comprises an opening and closing sheet (1561) with the diameter slightly smaller than that of the through cavity (152), an annular stop bar (1562) which is arranged between the opening and closing sheet (1561) and the electromagnetic valve (153) and fixed on the inner wall of the through cavity (152), and a plurality of stop blocks (1563) which are arranged between the opening and closing sheet (1561) and the piston (155) and fixed on the inner wall of the through cavity (152); the opening and closing sheet (1561) closes the passage when abutting against the annular baffle strip (1562); when the opening and closing piece (1561) is tightly pressed against the stop block (1563), high-temperature water can enter the impact cavity along the gap between the opening and closing piece (1561) and the through cavity (152) and the gap between the stop block (1563); one end of the return spring (158) is connected with the piston (155), and the other end is connected with the opening and closing sheet (1561).
10. The preparation method of the transverse breakable adhesive tape according to claim 9, characterized in that the hollow long shaft (14) between the heating functional section (14) and the mixing section (15) and between the mixing section (15) and the homogenizing discharging section (16) is respectively sleeved with a variable fan blade (17); the variable fan blade (17) comprises a fixed shaft sleeve (171) and a plurality of fan-shaped blade blocks (172) which are uniformly and fixedly inserted along the outer circumference of the fixed shaft sleeve (171); the fan-shaped blade blocks (172) form a circle under a static state; a rigid supporting rod (1723) is fixed on one side of the fan-shaped blade block (172); the rigid support rod (1723) is fixedly connected with the fixed shaft sleeve (171); the fan-shaped blade block (172) comprises a high-temperature-resistant insulating elastic plate (1721) in the middle and piezoelectric ceramic plates (1722) attached to two sides of the high-temperature-resistant insulating elastic plate (1721); applying opposite electric fields to the piezoelectric ceramic plates (1722), respectively, wherein the two piezoelectric ceramic plates (1722) are lengthened and shortened along the polarization direction, so that the high-temperature-resistant insulating elastic plate (1721) bends and deflects to one side around the rigid support rod (1723); the variable fan blades (17) can be flexibly switched between material blocking and material extruding at either side; bearing sleeves (113) are respectively arranged in the shell (11) close to the front end and the rear end; the bearing sleeve (113) is connected with the shell (11) through a plurality of connecting rods; the front end and the rear end of the multi-section type rotating body (12) are respectively detachably sleeved with the bearing sleeve (113) in a rotating way.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311259676.8A CN117103629A (en) | 2022-06-08 | 2022-06-08 | Extruder for preparing adhesive tape |
| CN202210640444.6A CN114940876A (en) | 2022-06-08 | 2022-06-08 | Transverse easily-broken adhesive tape and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210640444.6A CN114940876A (en) | 2022-06-08 | 2022-06-08 | Transverse easily-broken adhesive tape and preparation method thereof |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311259676.8A Division CN117103629A (en) | 2022-06-08 | 2022-06-08 | Extruder for preparing adhesive tape |
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| Publication Number | Publication Date |
|---|---|
| CN114940876A true CN114940876A (en) | 2022-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210640444.6A Withdrawn CN114940876A (en) | 2022-06-08 | 2022-06-08 | Transverse easily-broken adhesive tape and preparation method thereof |
| CN202311259676.8A Pending CN117103629A (en) | 2022-06-08 | 2022-06-08 | Extruder for preparing adhesive tape |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311259676.8A Pending CN117103629A (en) | 2022-06-08 | 2022-06-08 | Extruder for preparing adhesive tape |
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| CN (2) | CN114940876A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101077611A (en) * | 2007-05-31 | 2007-11-28 | 华南理工大学 | Pulse type shock processing on-line compound injection molding method and its equipment |
| CN110479386A (en) * | 2019-09-02 | 2019-11-22 | 刘奇 | A kind of high dispersive type composite photo-catalyst and preparation method thereof |
| CN110696462A (en) * | 2019-10-09 | 2020-01-17 | 安徽国风塑业股份有限公司 | High-strength bidirectional-stretching polylactic acid film and preparation method thereof |
| CN111763412A (en) * | 2020-05-29 | 2020-10-13 | 贵州省材料产业技术研究院 | Flame-retardant toughened polylactic acid-based composite material and preparation and application thereof |
| CN114083866A (en) * | 2021-12-13 | 2022-02-25 | 厦门长塑实业有限公司 | Biaxially oriented polylactic acid film for adhesive tape and preparation method thereof |
-
2022
- 2022-06-08 CN CN202210640444.6A patent/CN114940876A/en not_active Withdrawn
- 2022-06-08 CN CN202311259676.8A patent/CN117103629A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101077611A (en) * | 2007-05-31 | 2007-11-28 | 华南理工大学 | Pulse type shock processing on-line compound injection molding method and its equipment |
| CN110479386A (en) * | 2019-09-02 | 2019-11-22 | 刘奇 | A kind of high dispersive type composite photo-catalyst and preparation method thereof |
| CN110696462A (en) * | 2019-10-09 | 2020-01-17 | 安徽国风塑业股份有限公司 | High-strength bidirectional-stretching polylactic acid film and preparation method thereof |
| CN111763412A (en) * | 2020-05-29 | 2020-10-13 | 贵州省材料产业技术研究院 | Flame-retardant toughened polylactic acid-based composite material and preparation and application thereof |
| CN114083866A (en) * | 2021-12-13 | 2022-02-25 | 厦门长塑实业有限公司 | Biaxially oriented polylactic acid film for adhesive tape and preparation method thereof |
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| 欧育湘: "《阻燃剂》", 国防工业出版社, pages: 221 * |
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| CN117103629A (en) | 2023-11-24 |
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Application publication date: 20220826 |