CN110733220A - film for automatic packaging machine and preparation method thereof - Google Patents
film for automatic packaging machine and preparation method thereof Download PDFInfo
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- CN110733220A CN110733220A CN201910928419.6A CN201910928419A CN110733220A CN 110733220 A CN110733220 A CN 110733220A CN 201910928419 A CN201910928419 A CN 201910928419A CN 110733220 A CN110733220 A CN 110733220A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—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
- 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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Abstract
The invention relates to the technical field of heavy packaging films, in particular to films for automatic packaging machines and a preparation method thereof, wherein the films for the automatic packaging machines comprise an outer layer, a middle layer and an inner layer which are arranged from outside to inside and respectively comprise bodies, the outer layer comprises 75-85 parts of LLDPE and 15-25 parts of LDPE, the middle layer comprises 75-85 parts of LDPE and 15-25 parts of HDPE, and the inner layer comprises 75-85 parts of LDPE, 8-12 parts of PP, 3-5 parts of polyisobutylene and 4-6 parts of antistatic agent.
Description
Technical Field
The invention relates to the technical field of heavy packaging films, in particular to films for an automatic packaging machine and a preparation method thereof.
Background
The heavy packaging film is produced by taking brand-new PE (LDPE, LLDPE, m-LLDPE, HDPE and the like) as a raw material and adopting a three-layer co-extrusion film blowing production line introduced into Germany W ﹠ H company and matched four-layer printing lines, is called FFS blow molding bag film for short, is specially used for a high-speed full-automatic packaging machine, and is kinds of flexible packaging films.
The Chinese invention application (application number is CN 201010515776.9) discloses FFS films for heavy packaging, which have a three-layer structure, wherein the outer layer contains two kinds of m-LLDPE, the m-LLDPE and LDPE are proportioned according to , quantitative processing aids, antistatic agents and the like can be added, the middle layer contains 1 kind of m-LLDPE, the HDPE, LDPE and titanium dioxide are proportioned according to , the inner layer contains 2 kinds of m-LLDPE, the m-LLDPE and LDPE are proportioned according to , quantitative processing aids, opening agents and the like can be added, and the m-LLDPE related to the invention application is hexene copolymerization m-LLDPE.
In the FFS film, the m-LLDPE added to the inner film can increase the friction coefficient of the inner film, but the improvement effect is not significant. When the heavy packaging film is used for packaging products, the inner layer of the heavy packaging film is easy to rub against the products, and then the products are abraded.
Disclosure of Invention
In view of the defects of the prior art, an th object of the present invention is to provide films for automatic packaging machines, which have a high friction coefficient and can reduce the abrasion of the films to products when the films are used for packaging the products.
The second purpose of the invention is to provide a preparation method of films for automatic packaging machines, which adopts a co-extrusion technology and then adopts the operation of film pressing to obtain the films with high friction coefficients, and the preparation method has the characteristics of simple process and convenient operation and is convenient for batch production.
In order to achieve the th object, the invention provides the following technical solutions:
kinds of films for automatic packaging machine, comprising body arranged outer layer, middle layer and inner layer from outside to inside;
the outer layer comprises the following components in parts by weight: 75-85 parts of LLDPE and 15-25 parts of LDPE;
the middle layer comprises the following components in parts by weight: 75-85 parts of LDPE and 15-25 parts of HDPE;
the inner layer comprises the following components in parts by weight: 75-85 parts of LDPE, 8-12 parts of PP, 3-5 parts of polyisobutene and 4-6 parts of antistatic agent.
Further , the LLDPE is LLDPE7042, the LDPE is LDPE 2420 and the HDPE is HTA 002.
By adopting the technical scheme, the outer layer, the middle layer and the inner layer are respectively used as the th protective barrier, the second protective barrier and the third protective barrier of the packaging product, wherein the mechanical properties of the outer layer and the middle layer are superior to those of the inner layer due to addition of LLDPE and HDPE, so that a proper supporting effect can be provided for the inner layer.
The polyisobutylene is typical saturated linear polymers, and the combination of the polyisobutylene with the LDPE and the PP in the inner layer can improve the bonding force and the flexibility of the polyisobutylene, so that the friction coefficient of the inner layer can be effectively improved, and the abrasion of the polyisobutylene to a product during product packaging can be reduced.
When LLDPE is LLDPE7042, LDPE 2420 and HTA002, the film prepared by the method has excellent mechanical property and high friction coefficient, so that the method is preferable.
, the antistatic agent is prepared by mixing polyethylene terephthalate and polyvinyl alcohol according to the weight ratio of 3: 1.
By adopting the technical scheme, the polyethylene terephthalate has excellent electrical insulation and friction resistance, the addition of the polyethylene terephthalate can improve the antistatic performance of the film, and can also be cooperated with polyisobutylene to improve the friction coefficient of the film, the polyvinyl alcohol can better absorb static electricity due to the hydroxyl contained in the molecular structure of the polyvinyl alcohol, so that the antistatic effect is achieved, in addition, the polyvinyl alcohol has self-adhesion of , and the polyvinyl alcohol and the polyethylene terephthalate are mixed according to the weight ratio of 3:1, so that the antistatic performance of the inner layer can be effectively improved, the friction coefficient of the inner layer is improved, and the antistatic agent is preferably selected.
, the inner layer also contains 2-3 parts of opening agent.
By adopting the technical scheme, the addition of the opening agent is beneficial to smooth demoulding of the film, and the condition that the inner layer is glued due to the addition of the processing aid is reduced, so that the good mould opening effect of the inner layer is ensured.
Further , the opening agent is a modified silica modified with a surfactant.
By adopting the technical scheme, the good demoulding effect of the inner layer can be ensured in the aspect of the silicon dioxide modified by the surfactant, and the silicon dioxide is more uniformly dispersed in components such as LDPE, PP and the like.
Further , the surfactant is dopamine hydrochloride.
By adopting the technical scheme, dopamine hydrochloride can be automatically polymerized into polydopamine in a weak alkaline environment, polydopamine molecules contain a large number of polar groups and nonpolar groups, so that silicon dioxide can be promoted to be uniformly dispersed in components such as LDPE (low-density polyethylene), PP (polypropylene) and the like, in addition, the polydopamine in aspect also has viscosity of , further the stability of the silicon dioxide when the silicon dioxide is dispersed in the components such as LDPE, PP and the like is ensured, meanwhile, the polydopamine has good electrostatic adsorption effect and higher friction coefficient, and the polydopamine is used together with an antistatic agent, so that the antistatic performance of an inner layer is effectively improved, and a good protection effect on products can be achieved.
, the preparation method of the modified silicon dioxide comprises the following steps:
①, adding the nano silicon dioxide into a Tris-HCl buffer solution with the concentration of 50mmol/L, adjusting the pH value to 8.5 by using 5% hydrochloric acid, and performing ultrasonic dispersion for 30-40min to obtain a silicon dioxide suspension;
② adding dopamine hydrochloride into the suspension, wherein the addition amount of dopamine hydrochloride is 2-3% of that of nano-silica, magnetically stirring at room temperature for 18-20h, and stirring at 2-3m3Continuously introducing oxygen into the reaction kettle for reaction for h to obtain a mixed solution after the reaction is finished;
③, centrifuging the mixed solution for 20min at the rotating speed of 3000-3500r/min, discarding the supernatant, washing with 95% ethanol for 3 times according to the above centrifugation operation, removing dopamine hydrochloride which is not modified on silicon dioxide, and collecting the precipitate after centrifugation;
④, placing the precipitate in an oven, drying for 8-10h at the temperature of 160-170 ℃, and then performing ball milling for 10-15min to obtain the final modified silicon dioxide.
By adopting the technical scheme, because the dopamine hydrochloride has definite viscosity, the nano silicon dioxide is firstly dispersed in the Tris-HCl buffer solution, the agglomeration of the silicon dioxide can be reduced, the silicon dioxide dispersed in the mixed solution has good dispersibility, and at the moment, the dopamine hydrochloride is added according to the set addition amount so that the dopamine hydrochloride can be better modified on the surface of the silicon dioxide.
And , the particle size of the nano silicon dioxide is 100-150 nm.
By adopting the technical scheme, the nano silicon dioxide with the particle size of 100-150nm has good dispersibility, and the effect on the opening agent can be ensured, so that the nano silicon dioxide is preferable.
In order to achieve the second object, the invention provides the following technical scheme:
A method for preparing a film for an automatic packaging machine, comprising the following steps:
a. melting of the film: respectively carrying out melt plastification on the inner layer, the middle layer and the outer layer for 1.5-2min at the temperature of 240-260 ℃ to respectively obtain a melt I, a melt II and a melt III;
b. and (3) pressing the melt: respectively forming a blank body by the melt I, the melt II and the melt III at the extrusion speed of 0.6-1.0m/s, fixing the blank body in a stretching film distributor, and performing three-layer distribution through the stretching film distributor to obtain a casting melt with the viscosity of 800-1000mPa & s;
c. solidifying the casting melt, namely performing three-layer co-extrusion casting on the casting melt obtained in the step ②, and performing cooling solidification operation by using cooling water at the flow rate of 40-60L/min to obtain a crude product;
d. film pressing and slitting of the primary product: and (3) placing the crude product in a roller press, pressing the film at a rolling speed of 3-4m/s and a rolling pressure of 10-15N, and setting the position of a slitting group for slitting according to the requirement of the product specification to obtain the final film for the automatic packaging machine.
Through adopting above-mentioned technical scheme, the mode of this application through coextrusion casting is formed with skin, middle level and inlayer body processing, contains the same component in every layer of cooperation, and the film that makes from this has good structural stability, again with the help of the operation of pressed film to obtain high coefficient of friction's film, have the characteristics that the process is simple, convenient operation, be convenient for put into batch production.
In conclusion, the invention has the following beneficial effects:
1. the film provides a good supporting effect for the inner layer through the outer layer and the middle layer, and the prepared inner layer has a higher friction coefficient by virtue of the component proportion of LDFE, PP, polyisobutylene and an antistatic agent in the inner layer, so that the abrasion of the inner layer to a product during product packaging can be reduced;
2. the antistatic agent can improve the antistatic property of the film and can also improve the friction coefficient of the film;
3. the self-made modified silica opening agent is added into the inner layer of the film, so that the inner layer has an excellent mold opening effect, and the antistatic performance and the friction coefficient of the inner layer can be improved at fixed degree;
4. this application adopts the coextrusion technique, again with the help of the operation of press mold to obtain high coefficient of friction's film, have the characteristics that the process is simple, convenient operation, be convenient for put into batch production.
Drawings
FIG. 1 is a process for preparing modified silica;
FIG. 2 shows a process for producing a film for an automatic wrapping machine.
Detailed Description
The present invention is further described in detail below with reference to the attached figures.
1. Raw materials
LLDPE, LDPE, HDPE, PP of the present application are all purchased from Exxon Mobil;
polyethylene terephthalate: purchased from dupont, injection grade, brand PET;
polyvinyl alcohol: purchased from pengyu chemical industry of Fuchuu city, the solid content is 99 percent, and the mesh number is 80-120 meshes;
nano silicon dioxide: purchased from Zhengzhou Tuoxiang trade Co., Ltd, in an amount of 93%;
Tris-HCl buffer: purchased from alatin reagent, with a purity of 99%;
dopamine hydrochloride: purchased from alatin reagent, with a purity of 98%;
modified silica modified with dopamine hydrochloride: referring to fig. 1, the preparation method comprises the following steps:
①, adding the nano silicon dioxide into a Tris-HCl buffer solution with the concentration of 50mmol/L, adjusting the pH value to 8.5 by using 5% hydrochloric acid, and performing ultrasonic dispersion for 30-40min to obtain a silicon dioxide suspension;
② adding dopamine hydrochloride into the suspension, wherein the addition amount of dopamine hydrochloride is 2-3% of that of nano-silica, magnetically stirring at room temperature for 18-20h, and stirring at 2-3m3Continuously introducing oxygen into the reaction kettle for reaction for h to obtain a mixed solution after the reaction is finished;
③, centrifuging the mixed solution for 20min at the rotating speed of 3000-3500r/min, discarding the supernatant, washing with 95% ethanol for 3 times according to the above centrifugation operation, removing dopamine hydrochloride which is not modified on silicon dioxide, and collecting the precipitate after centrifugation;
④, placing the precipitate in an oven, drying for 8-10h at the temperature of 160-170 ℃, and then performing ball milling for 10-15min to obtain the final modified silicon dioxide.
2. Examples of the embodiments
2.1, example 1
film for automatic packaging machine comprises an outer layer, a middle layer and an inner layer which are arranged from outside to inside and comprise bodies, wherein the outer layer comprises the following components in parts by weight of 704280 parts of LLDPE and 242020 parts of LDPE;
the middle layer comprises the following components in parts by weight: 242080 parts of LDPE and 00220 parts of HTA;
the inner layer comprises the following components in parts by weight: 242080 parts of LDPE, 310 parts of PP 7032E, 4 parts of polyisobutylene, 4 parts of antistatic agent and 2 parts of modified silicon dioxide;
wherein the antistatic agent is formed by mixing polyethylene terephthalate and polyvinyl alcohol according to the weight ratio of 3: 1;
modification IIDuring the preparation of the silicon oxide, the mesh number of the nano-silicon dioxide is 120 meshes, ultrasonic dispersion is carried out for 35min, the addition amount of dopamine hydrochloride is 2 percent of that of the nano-silicon dioxide, magnetic stirring is carried out for 18h at room temperature, and the stirring speed is 2.5m3Continuously introducing oxygen into the flow/h, centrifugally separating at 3200r/min for 20min, drying at 165 deg.C for 9h, and ball milling for 12 min.
The preparation method of the film for the automatic packaging machine, which is shown in figure 2, comprises the following steps:
a. melting of the film: respectively carrying out melt plasticization on the inner layer, the middle layer and the outer layer for 1.5min at the temperature of 250 ℃ to respectively obtain a melt I, a melt II and a melt III;
b. and (3) pressing the melt: respectively forming a green body by the melt I, the melt II and the melt III at the extrusion speed of 0.8m/s, fixing the green body in a stretching film distributor, and performing three-layer distribution through the stretching film distributor to obtain a casting melt with the viscosity of 900mPa & s;
c. solidifying the casting melt, namely performing three-layer co-extrusion casting on the casting melt obtained in the step ②, and performing cooling solidification operation by using cooling water at the flow rate of 55L/min to obtain a crude product;
d. film pressing and slitting of the primary product: and (3) placing the crude product in a roller press, pressing a film at a rolling speed of 3.5m/s and a rolling pressure of 12N, and setting the position of a slitting group for slitting according to the requirement of product specification to obtain the final film for the automatic packaging machine.
2.2, examples 2 to 6
Examples 2-6 adjustments were made to the composition and content of the films based on the method of example 1, see table below.
TABLE film Components and compositional content parameter tables for examples 1-6
2.3, examples 7 to 8
Examples 7-8 adjustments were made to the modified silica preparation parameters based on the procedure of example 1, see table two below.
TABLE two film Components and component content parameter tables for example 1 and examples 7-8
2.4, examples 9 to 10
Examples 9-10 based on the method of example 1, the preparation parameters of the film were adjusted, and see table three below.
TABLE TRI-EXAMPLES 1 AND 9-10 film Components AND COMPONENT CONTENT PARAMETERS
3. Comparative example
3.1, comparative example 1
The difference from example 1 is that no polyisobutene is added to the inner layer.
3.2, comparative example 2
The difference from example 1 is that no PP is added to the inner layer.
3.3, comparative example 3
This comparative example is an FFS film for repackaging having application No. CN 201010515776.9.
4. Performance tests the films of examples 1-10 and comparative examples 1-3 described above were subjected to the following performance tests, the results of which are given in table four below.
TABLE IV film Components and component content parameter tables for examples 1-10 and comparative examples 9-10
The mold release effect is shown in the specification, wherein A + shows that the mold release effect is excellent, the surface is smooth and flat and has no defect, A shows that the mold release effect is good, the surface flatness is inferior to A +, and A-shows that the mold release effect is -like, a small amount of small pits are arranged on the surface, and the normal use of the mold release agent is not influenced.
By combining the table four, comparing the detection results of the example 1 with those of the comparative examples 1 to 3, it can be obtained that the film of the present application provides a good supporting effect for the inner layer through the outer layer and the middle layer, and the prepared inner layer has a higher friction coefficient by virtue of the component ratio of the LDFE, PP, polyisobutylene and antistatic agent in the inner layer, so that the wear of the inner layer to the product can be reduced when the film is used for packaging the product, and the film has excellent antistatic property (the resistivity is higher, the antistatic effect is better), mold release effect and mechanical property (tensile breaking stress).
Comparing the test results of examples 1 to 3, it can be seen that when the antistatic agent is formed by mixing polyethylene terephthalate and polyvinyl alcohol in a weight ratio of 3:1, the antistatic property of the inner layer can be effectively improved while increasing the friction coefficient of the inner layer, and thus the antistatic agent is preferable.
Comparing the detection results of example 1 and example 4, it can be seen that when LLDPE7042 is used for LLDPE, LDPE 2420 is used for LDPE, and HTA002 is used for HDPE, the film obtained therefrom has excellent mechanical properties (tensile stress at break) and a high friction coefficient, and thus is preferable.
Comparing the detection results of the embodiment 1 and the embodiments 5 to 6, it can be obtained that when the modified silica modified by dopamine hydrochloride is added to the inner layer of the present application, the corresponding film has both good electrostatic adsorption effect and high friction coefficient, and can play a good protection role on the product.
The detection results of the embodiments 1, 7 to 8, and 9 to 10 can be obtained, and the application can respectively realize batch production of the modified silica and the film according to the preparation method of the modified silica and the preparation method of the film disclosed above, and has the characteristics of simple process and convenient operation.
Claims (9)
1, A film for automatic packaging machine, comprising body of outer layer, middle layer and inner layer from outside to inside, characterized in that,
the outer layer comprises the following components in parts by weight: 75-85 parts of LLDPE and 15-25 parts of LDPE;
the middle layer comprises the following components in parts by weight: 75-85 parts of LDPE and 15-25 parts of HDPE;
the inner layer comprises the following components in parts by weight: 75-85 parts of LDPE, 8-12 parts of PP, 3-5 parts of polyisobutene and 4-6 parts of antistatic agent.
2. The film for automatic packaging machine according to claim 1, wherein the LLDPE is LLDPE7042, the LDPE is LDPE 2420 and the HDPE is HTA 002.
3. The film for automatic packaging machine according to claim 1, wherein the antistatic agent is a mixture of polyethylene terephthalate and polyvinyl alcohol at a weight ratio of 3: 1.
4. The film for automatic packaging machine according to claim 1, wherein the inner layer further comprises 2-3 parts of an opening agent.
5. The kind of films for automatic packaging machine according to claim 4, wherein the opening agent is modified silica modified with a surfactant.
6. The film for automatic packaging machine according to claim 5, wherein the surfactant is dopamine hydrochloride.
7. The kinds of films for automatic packaging machine according to claim 6, wherein the modified silica is prepared by a method comprising the steps of:
①, adding the nano silicon dioxide into a Tris-HCl buffer solution with the concentration of 50mmol/L, adjusting the pH value to 8.5 by using 5% hydrochloric acid, and performing ultrasonic dispersion for 30-40min to obtain a silicon dioxide suspension;
② adding dopamine hydrochloride into the suspension, wherein the addition amount of dopamine hydrochloride is 2-3% of that of nano-silica, magnetically stirring at room temperature for 18-20h, and stirring at 2-3m3Continuously introducing oxygen into the reaction kettle for reaction for h to obtain a mixed solution after the reaction is finished;
③, centrifuging the mixed solution for 20min at the rotating speed of 3000-3500r/min, discarding the supernatant, washing with 95% ethanol for 3 times according to the above centrifugation operation, removing dopamine hydrochloride which is not modified on silicon dioxide, and collecting the precipitate after centrifugation;
④, placing the precipitate in an oven, drying for 8-10h at the temperature of 160-170 ℃, and then performing ball milling for 10-15min to obtain the final modified silicon dioxide.
8. The kinds of films for automatic packaging machine, as claimed in claim 7, wherein the particle size of the nano-silica is 100-150 nm.
9. The method of preparing the kinds of films for automatic packaging machines as claimed in any of claims 1 to 8, wherein the method comprises the steps of:
a. melting of the film: respectively carrying out melt plastification on the inner layer, the middle layer and the outer layer for 1.5-2min at the temperature of 240-260 ℃ to respectively obtain a melt I, a melt II and a melt III;
b. and (3) pressing the melt: respectively forming a blank body by the melt I, the melt II and the melt III at the extrusion speed of 0.6-1.0m/s, fixing the blank body in a stretching film distributor, and performing three-layer distribution through the stretching film distributor to obtain a casting melt with the viscosity of 800-1000mPa & s;
c. solidifying the casting melt, namely performing three-layer co-extrusion casting on the casting melt obtained in the step ②, and performing cooling solidification operation by using cooling water at the flow rate of 40-60L/min to obtain a crude product;
d. film pressing and slitting of the primary product: and (3) placing the crude product in a roller press, pressing the film at a rolling speed of 3-4m/s and a rolling pressure of 10-15N, and setting the position of a slitting group for slitting according to the requirement of the product specification to obtain the final film for the automatic packaging machine.
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| US20020037386A1 (en) * | 2000-07-31 | 2002-03-28 | Bonke Douglas D. | Plastic wrap with cling layer |
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| CN102452204A (en) * | 2010-10-22 | 2012-05-16 | 中国石油化工股份有限公司 | FFS film for heavy packaging |
| CN109093978A (en) * | 2018-06-19 | 2018-12-28 | 宁波鸿雁包装材料有限公司 | A kind of film and its production method of high draw ratio |
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Application publication date: 20200131 |