CN111269512A - Polyvinyl alcohol film opening agent, polyvinyl alcohol composition, polyvinyl alcohol film master batch and polyvinyl alcohol film - Google Patents
Polyvinyl alcohol film opening agent, polyvinyl alcohol composition, polyvinyl alcohol film master batch and polyvinyl alcohol film Download PDFInfo
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- CN111269512A CN111269512A CN201811472139.0A CN201811472139A CN111269512A CN 111269512 A CN111269512 A CN 111269512A CN 201811472139 A CN201811472139 A CN 201811472139A CN 111269512 A CN111269512 A CN 111269512A
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- polyvinyl alcohol
- opening agent
- alcohol film
- film
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- 229920002451 polyvinyl alcohol Polymers 0.000 title claims abstract description 224
- 239000004372 Polyvinyl alcohol Substances 0.000 title claims abstract description 221
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 104
- 239000000203 mixture Substances 0.000 title claims abstract description 47
- 239000004594 Masterbatch (MB) Substances 0.000 title claims abstract description 21
- -1 amide compound Chemical class 0.000 claims abstract description 19
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 30
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 27
- 239000004014 plasticizer Substances 0.000 claims description 27
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims description 25
- 239000006229 carbon black Substances 0.000 claims description 25
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims description 25
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 13
- 239000004698 Polyethylene Substances 0.000 claims description 13
- 229920000573 polyethylene Polymers 0.000 claims description 13
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- 239000002202 Polyethylene glycol Substances 0.000 claims description 8
- 229920001223 polyethylene glycol Polymers 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 5
- 235000011187 glycerol Nutrition 0.000 claims description 5
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 claims description 3
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims description 3
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims description 3
- 229930195725 Mannitol Natural products 0.000 claims description 3
- 239000005662 Paraffin oil Substances 0.000 claims description 3
- 125000003158 alcohol group Chemical group 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 239000000594 mannitol Substances 0.000 claims description 3
- 235000010355 mannitol Nutrition 0.000 claims description 3
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 claims description 3
- FATBGEAMYMYZAF-UHFFFAOYSA-N oleicacidamide-heptaglycolether Natural products CCCCCCCCC=CCCCCCCCC(N)=O FATBGEAMYMYZAF-UHFFFAOYSA-N 0.000 claims description 3
- 239000000600 sorbitol Substances 0.000 claims description 3
- 239000001993 wax Substances 0.000 claims description 3
- 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
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 15
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 188
- 239000010408 film Substances 0.000 description 119
- 238000006116 polymerization reaction Methods 0.000 description 37
- 230000000052 comparative effect Effects 0.000 description 26
- 238000006136 alcoholysis reaction Methods 0.000 description 13
- 239000002994 raw material Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 5
- 239000000155 melt Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010096 film blowing Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- DJOWTWWHMWQATC-KYHIUUMWSA-N Karpoxanthin Natural products CC(=C/C=C/C=C(C)/C=C/C=C(C)/C=C/C1(O)C(C)(C)CC(O)CC1(C)O)C=CC=C(/C)C=CC2=C(C)CC(O)CC2(C)C DJOWTWWHMWQATC-KYHIUUMWSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/20—Carboxylic acid amides
Abstract
The invention provides a polyvinyl alcohol film opening agent, a polyvinyl alcohol composition, a polyvinyl alcohol film master batch and a polyvinyl alcohol film, and relates to the technical field of opening agents, wherein the polyvinyl alcohol film opening agent comprises an organic opening agent and an inorganic opening agent, and the mass ratio of the organic opening agent to the inorganic opening agent is (1-3): (10-50), the technical problem that the opening of a polyvinyl alcohol film cannot be solved by adding an amide compound as an opening agent in the prior art is solved, and the polyvinyl alcohol film opening agent provided by the invention is added into a polyvinyl alcohol film processing system through the mutual cooperation of an organic opening agent and an inorganic opening agent in a specific mass ratio, so that the prepared polyvinyl alcohol film has good opening property.
Description
Technical Field
The invention relates to the technical field of opening agents, in particular to a polyvinyl alcohol film opening agent, a polyvinyl alcohol composition, a polyvinyl alcohol film master batch and a polyvinyl alcohol film.
Background
Polyvinyl alcohol is a polymer material that can be synthesized through non-petroleum routes, and the advantages of polyvinyl alcohol are increasingly shown along with the exhaustion of petroleum resources. Due to the structural characteristics, polyhydroxy and strong hydrogen bonds endow the polyvinyl alcohol film with a plurality of excellent performances, the polyvinyl alcohol film is widely applied to the industries of coatings, adhesives, fibers and films, and particularly rapidly increases in recent years at the rate of 8-10% of the annual average growth rate.
However, the polyethylene films can be pressed to adhere together during the production and storage processes, which affects the use of the polyethylene films in people's daily life and in industrial automatic packaging production lines. Therefore, it is necessary to add an opening agent in the film processing process, reduce the contact area between films through the opening agent, reduce the surface friction coefficient of the films, make the films easy to open, and thus play a role in preventing the films from blocking.
The existing commonly used film opening agent is an amide compound, but the technical problem of opening of the polyvinyl alcohol film cannot be solved by adding the amide compound into the polyvinyl alcohol film.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a polyvinyl alcohol film opening agent to solve the technical problem that the opening of a polyvinyl alcohol film cannot be solved by adding an amide compound as an opening agent in the prior art.
The polyvinyl alcohol film opening agent provided by the invention comprises an organic opening agent and an inorganic opening agent, wherein the mass ratio of the organic opening agent to the inorganic opening agent is (1-3): (10-50).
Further, the organic opening agent is selected from at least one of oleamide, erucamide, paraffin oil and polyethylene wax, preferably erucamide;
and/or the inorganic opening agent is selected from at least one of white carbon black, talcum powder and calcium carbonate, and white carbon black is preferred.
The invention also aims to provide a polyvinyl alcohol composition which comprises the polyvinyl alcohol film opening agent provided by the invention.
Further, the polyvinyl alcohol composition comprises the following components in parts by weight: 50-70 parts of polyvinyl alcohol, 15-30 parts of a plasticizer and 1.1-5.3 parts of a polyvinyl alcohol film opening agent;
preferably, the polyvinyl alcohol film opening agent comprises 0.1-0.3 part of organic opening agent and 1-5 parts of inorganic opening agent in parts by mass.
Further, the plasticizer is an alcohol plasticizer;
preferably, the alcohol plasticizer is selected from at least one of ethylene glycol, propylene glycol, glycerin, polyethylene glycol, sorbitol, pentaerythritol, and mannitol.
Furthermore, the mass ratio of the plasticizer to the inorganic opening agent is (1-3): 10-20, preferably (1-2.5): 10.
The invention also aims to provide a polyvinyl alcohol film master batch which comprises the polyvinyl alcohol film opening agent or the polyvinyl alcohol composition.
The fourth purpose of the invention is to provide a preparation method of polyvinyl alcohol film master batch, which comprises the following steps: uniformly mixing polyvinyl alcohol, a plasticizer and a polyvinyl alcohol film opening agent, melting and granulating to obtain polyvinyl alcohol film master batches;
preferably, the melting temperature is 140 to 180 ℃.
The fifth purpose of the invention is to provide a polyvinyl alcohol film, which comprises the polyvinyl alcohol film opening agent or the polyvinyl alcohol composition provided by the invention.
The invention also aims to provide a preparation method of the polyvinyl alcohol film, which comprises the following steps:
and blowing the polyvinyl alcohol film master batch to obtain the polyvinyl alcohol film.
The polyvinyl alcohol film opening agent provided by the invention is added to a polyvinyl alcohol film processing system through the mutual cooperation of the organic opening agent and the inorganic opening agent with specific mass ratio, and the prepared polyvinyl alcohol film has good opening property.
The polyvinyl alcohol film prepared from the polyvinyl alcohol film opening agent provided by the invention has good opening performance.
The polyvinyl alcohol film prepared from the polyvinyl alcohol film opening agent provided by the invention has good opening performance.
The polyvinyl alcohol film prepared by the polyvinyl alcohol film opening agent provided by the invention has good opening performance.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
It should be noted that:
in the present invention, all the embodiments and preferred methods mentioned herein can be combined with each other to form a new technical solution, if not specifically stated.
In the present invention, the percentage (%) or parts means the weight percentage or parts by weight with respect to the composition, if not otherwise specified.
In the present invention, the components referred to or the preferred components thereof may be combined with each other to form a novel embodiment, if not specifically stated.
In the present invention, unless otherwise stated, the numerical range "a-b" represents a shorthand representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, a numerical range of "6 to 22" means that all real numbers between "6 to 22" have been listed herein, and "6 to 22" is only a shorthand representation of the combination of these numerical values.
The "ranges" disclosed herein may have one or more lower limits and one or more upper limits, respectively, in the form of lower limits and upper limits.
In the present invention, unless otherwise specified, the individual reactions or operation steps may be performed sequentially or may be performed in sequence. Preferably, the reaction processes herein are carried out sequentially.
Unless otherwise defined, technical and scientific terms used herein have the same meaning as is familiar to those skilled in the art. In addition, any methods or materials similar or equivalent to those described herein can also be used in the present invention.
In the processing process of the existing polypropylene film or polyethylene film, organic erucamide or inorganic silica is generally required to be added as an opening agent, and good opening property can be achieved. However, due to the structural particularity of polyvinyl alcohol, amide compounds are likely to interact with functional groups of polyvinyl alcohol and are shielded, so that the problem of the opening property of the prepared polyvinyl alcohol film cannot be solved.
According to the first aspect of the invention, the polyvinyl alcohol film opening agent comprises an organic opening agent and an inorganic opening agent, and the mass ratio of the organic opening agent to the inorganic opening agent is (1-3): (10-50).
In the invention, the polyvinyl alcohol film opening agent is prepared by compounding the organic opening agent and the inorganic opening agent, so that after a processing system of the polyvinyl alcohol film is added, the polyvinyl alcohol film opening agent can be cooperated with polyvinyl alcohol resin, and the prepared polyvinyl alcohol film has good opening property.
In the present invention, typical but non-limiting mass ratios of the organic and inorganic opening agents are 1:5, 1:10, 1:15, 1:20, 1:25, 1:30, 1:40, 1:50, 3:10, 3:20, 3:40, or 3: 50.
In a preferred embodiment of the present invention, the organic opening agent is selected from one or more of oleamide, erucamide, paraffin oil and polyethylene wax.
In a preferred embodiment of the present invention, the inorganic opening agent is selected from one or more of white carbon black, talc and calcium carbonate.
In a preferred embodiment of the present invention, the particle size of the organic opening agent and the particle size of the inorganic opening agent are both 2000 to 5000 mesh. The particle size of the organic opening agent and the particle size of the inorganic opening agent are controlled to be 2000-5000 meshes, so that the organic opening agent and the inorganic opening agent can be uniformly mixed in a polyvinyl alcohol film processing system, and the performance stability of the polyvinyl alcohol film is improved.
In a preferred embodiment of the present invention, typical but non-limiting particle sizes of the organic and inorganic opening agents are, for example, 2000, 2500, 3000, 3500, 4000, 4500 or 5000 mesh.
According to a second aspect of the present invention, there is provided a polyvinyl alcohol composition comprising the polyethylene film opening agent provided by the present invention.
The polyvinyl alcohol film prepared from the polyvinyl alcohol film opening agent provided by the invention has good opening performance.
In a preferred embodiment of the invention, the polyvinyl alcohol composition comprises 50-70 parts by weight of polyvinyl alcohol, 15-30 parts by weight of plasticizer and 1.1-5.3 parts by weight of polyvinyl alcohol film opening agent; wherein, in the polyvinyl alcohol film opening agent, 0.1-0.3 part of organic opening agent and 1-5 parts of inorganic opening agent are used.
The alcoholysis Degree (DH) and the polymerization Degree (DP) are the main technical indexes of the polyvinyl alcohol, and the polyvinyl alcohols with different alcoholysis degrees and polymerization degrees have different performances and purposes. According to the invention, the polyvinyl alcohol with higher polymerization degree is used as the base material to ensure that the polyvinyl alcohol film has excellent mechanical property
In a preferred embodiment of the present invention, the polymerization degree of the polyvinyl alcohol is 300 to 3500, more preferably 500 to 2600. Typically, but not limited to, for example, 300, 400, 500, 600, 800, 1000, 1500, 2000, 2400, 3000, or 3500; the alcoholysis degree is 80-99%, more preferably 88-99%, and typically, but not limited to, 80%, 82%, 85%, 88%, 90%, 95%, 96%, 97%, 98%, 99% or 99.5%.
The polyvinyl alcohol composition provided by the invention reduces the plasticizing temperature of polyvinyl alcohol and enhances the flexibility and the processing performance of a polyethylene film by adding the plasticizer. The opening performance of the polyvinyl alcohol film is improved by adding the polyvinyl alcohol film opening agent.
The polyvinyl alcohol composition provided by the invention has the advantages that the polyvinyl alcohol, the plasticizer and the polyvinyl alcohol film opening agent are mutually cooperated, so that the processing performance of the polyvinyl alcohol composition is more excellent, and the performance of the prepared polyethylene film is more excellent.
In typical, but non-limiting embodiments of the invention, the typical, but non-limiting, mass fraction of polyvinyl alcohol is, for example, 50, 52, 55, 58, 60, 65, 68, or 70 parts; typical but non-limiting mass parts of the plasticizer are, for example, 20, 22, 25, 28 or 30 parts; typical but non-limiting mass parts of the polyvinyl alcohol film opening agent are, for example, 1.1, 1.2, 1.3, 2.1, 2.2, 2.33, 1, 3.2, 3.3, 4.1, 4.2, 4.3, 5.1, 5.2, or 5.3 parts. Preferably, in the polyethylene film opening agent, typical but not limiting mass parts of the organic opening agent are, for example, 0.1, 0.12, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28 or 0.3 parts; typical but non-limiting parts by mass of the inorganic opening agent are, for example, 1, 1.2, 1.5, 1.8, 2, 2.5, 3, 3.5, 4, 4.5 or 5 parts.
In a preferred embodiment of the present invention, the polyvinyl alcohols in the polyvinyl alcohol composition are used in conjunction with each other with polyvinyl alcohols having different polymerization degrees, depending on the use of the polyvinyl alcohol film. The polyvinyl alcohol includes polyvinyl alcohol with a higher polymerization degree and polyvinyl alcohol with a small polymerization degree. A small amount of polyvinyl alcohol with lower polymerization degree is added into polyvinyl alcohol with higher polymerization degree, so that the polyvinyl alcohol with higher polymerization degree and the polyvinyl alcohol with lower polymerization degree are mutually cooperated, the melting temperature of the polyvinyl alcohol with higher polymerization degree is reduced, and the processing performance of the polyvinyl alcohol is improved.
In a preferred embodiment of the present invention, in the polyvinyl alcohol for preparing the polyvinyl alcohol film, the mass ratio of the polyvinyl alcohol with higher polymerization degree to the polyvinyl alcohol with lower polymerization degree is (5-6): (1-2) so that the melt fluidity is better in the processing process of the polyvinyl alcohol, and the performance of the prepared polyvinyl alcohol film is better.
In an embodiment of the invention, typical but non-limiting masses of higher degree of polymerization polyvinyl alcohol and lower polymer in the polyvinyl alcohol feedstock are, for example, 5:1, 5.5:1, 6:1, 5:1.5, 5.5:1.5, 4:1, 6:1 or 3: 1.
In a typical but non-limiting embodiment of the present invention, the polyvinyl alcohol may be compounded with polyvinyl alcohol having a polymerization degree of 2400 to 3000 and polyvinyl alcohol having a polymerization degree of 1500 to 2000, or may be compounded with polyvinyl alcohol having a polymerization degree of 1500 to 2000 and polyvinyl alcohol having a polymerization degree of 300 to 800; preferably, polyvinyl alcohol with the polymerization degree of 2600 and polyvinyl alcohol with the polymerization degree of 1700 are compounded with each other to prepare the polyvinyl alcohol film with higher mechanical strength requirement, and polyvinyl alcohol with the polymerization degree of 2400 and polyvinyl alcohol with the polymerization degree of 500 are compounded with each other to prepare the polyvinyl alcohol film with lower mechanical strength requirement.
In a preferred embodiment of the invention, the plasticizer is an alcohol plasticizer. The alcohol plasticizer is adopted, so that the processing performance of the polyvinyl alcohol composition is better. Preferably, the alcohol plasticizer is one or more selected from ethylene glycol, propylene glycol, glycerol, polyethylene glycol, sorbitol, quaternary tetrol and mannitol, preferably small molecular alcohol with molecular weight of less than 100, such as one or more selected from ethylene glycol, propylene glycol and glycerol.
In a preferred embodiment of the present invention, the mass ratio of the inorganic opening agent to the plasticizer is (1-5): 15-30. The excellent processing performance of the polyvinyl alcohol composition is ensured by controlling the mass ratio of the inorganic opening agent to the plasticizer. Typically, but not by way of limitation, the mass ratio of inorganic opening agent to plasticizer is, for example, 1:15, 2:15, 1:5, 4:15, 1:3, 1:20, 1:10, 3:20, 1:4, 1.5: 10; 10. 1:5, 1:4, 3:10, 1:15, 2: 15. 1:20 or 3: 20.
According to a third aspect of the present invention, the present invention provides a polyvinyl alcohol film masterbatch, which comprises the polyvinyl alcohol film opening agent provided by the present invention or the polyvinyl alcohol composition provided by the present invention.
The polyvinyl alcohol film prepared from the polyvinyl alcohol film opening agent provided by the invention has good opening performance.
According to a fourth aspect of the present invention, the present invention provides a method for preparing a polyvinyl alcohol film masterbatch, comprising the steps of: uniformly mixing polyvinyl alcohol, a plasticizer and a polyvinyl alcohol film opening agent, melting and granulating to obtain the polyvinyl alcohol film master batch. The polyvinyl alcohol, the plasticizer and the polyvinyl alcohol film opening agent are uniformly mixed and then melted and granulated, so that the components in the polyvinyl alcohol film master batch are more uniformly mixed, and the prepared polyethylene film is more stable in performance.
The polymerization degree of polyvinyl alcohol is different, and the melting temperature is also different, and the higher the polymerization degree of polyvinyl alcohol is, the higher the melting temperature is. The polyvinyl alcohol film is preferably made of polyvinyl alcohol having a polymerization degree of 500 to 3600 according to the use requirements of the polyvinyl alcohol film. Preferably, the melting temperature is 140-180 ℃. Typically, but not by way of limitation, the melting temperature is, for example, 140, 1550, 160, 170 or 180 ℃.
In a preferred embodiment of the present invention, the preparation of the polyvinyl alcohol film master batch is performed by using a twin-screw extruder, so that the mixing between the raw materials of the polyvinyl alcohol composition is more uniform.
According to a fifth aspect of the present invention, there is provided a polyvinyl alcohol film comprising the polyethylene film opening agent provided by the present invention or the polyethylene composition provided by the present invention.
The polyvinyl alcohol film prepared by the polyvinyl alcohol film opening agent provided by the invention has good opening performance.
According to a sixth aspect of the present invention, there is provided a method for preparing a polyvinyl alcohol film, comprising the steps of:
and blowing the polyvinyl alcohol film master batch to obtain the polyvinyl alcohol film.
The preparation method of the polyvinyl alcohol film provided by the invention is simple in process and convenient to operate, and can save a large amount of manpower and material resources.
The technical solution provided by the present invention is further described below with reference to examples and comparative examples.
Example 1
The embodiment provides a polyvinyl alcohol composition, which comprises the following raw materials in parts by weight: 50kg of polyvinyl alcohol (polymerization degree 2600, alcoholysis degree 99%), 20kg of polyvinyl alcohol (polymerization degree 1700, alcoholysis degree 99%), 20kg of propylene glycol, 5kg of glycerol, 2kg of white carbon black (3000 meshes) and 0.3kg of erucamide (3000 meshes), wherein the mass ratio of the white carbon black to the erucamide is 2: 0.3.
Example 2
The embodiment provides a polyvinyl alcohol composition, the types and manufacturers of raw materials adopted in the embodiment are the same as those in embodiment 1, and the difference from embodiment 1 is that the white carbon black is 3kg, and the mass ratio of the white carbon black to the erucamide is 1: 0.1.
Example 3
The embodiment provides a polyvinyl alcohol composition, which comprises the following raw materials in parts by weight: 60kg of polyvinyl alcohol (with the polymerization degree of 2400 and the alcoholysis degree of 88 percent), 10kg of polyvinyl alcohol (with the polymerization degree of 500 and the alcoholysis degree of 88 percent), 20kg of propylene glycol, 10kg of polyethylene glycol (with the number average molecular weight of 400), 5kg of white carbon black (with the mesh size of 3000) and 0.3kg of erucamide (with the mesh size of 3000), wherein the mass ratio of the white carbon black to the erucamide is 5: 0.3.
Example 4
The embodiment provides a polyvinyl alcohol composition, which comprises the following raw materials in parts by weight: 60kg of polyvinyl alcohol (with the polymerization degree of 2400 and the alcoholysis degree of 88 percent), 10kg of polyvinyl alcohol (with the polymerization degree of 500 and the alcoholysis degree of 88 percent), polyethylene glycol (with the number average molecular weight of 400), 1kg of white carbon black (with the mesh size of 3000) and 0.3kg of erucamide (with the mesh size of 3000), wherein the mass ratio of the white carbon black to the erucamide is 1: 0.3.
Example 5
The embodiment provides a polyvinyl alcohol composition, which comprises the following raw materials in parts by weight: 60kg of polyvinyl alcohol (with the polymerization degree of 2400 and the alcoholysis degree of 88 percent), 10kg of polyvinyl alcohol (with the polymerization degree of 500 and the alcoholysis degree of 88 percent), 25kg of propylene glycol, 5kg of white carbon black (with the mesh size of 3000) and 0.3kg of erucamide (with the mesh size of 3000), wherein the mass ratio of the white carbon black to the erucamide is 1: 0.3.
Example 6
The embodiment provides a polyvinyl alcohol composition, which comprises the following raw materials in parts by weight: 60kg of polyvinyl alcohol (with the polymerization degree of 2400 and the alcoholysis degree of 88 percent), 10kg of polyvinyl alcohol (with the polymerization degree of 500 and the alcoholysis degree of 88 percent), 20kg of propylene glycol, polyethylene glycol (with the number average molecular weight of 400), 2kg of white carbon black (with the mesh of 3000) and 0.1kg of erucamide (with the mesh of 3000), wherein the mass ratio of the white carbon black to the erucamide is 2: 0.1.
Example 7
The embodiment provides a polyvinyl alcohol composition, the types and manufacturers of raw materials adopted in the embodiment are the same as those in embodiment 3, and the differences from embodiment 3 are that the white carbon black is 4kg, the erucamide is 0.3kg, and the mass ratio of the white carbon black to the erucamide is 4: 0.3.
Comparative example 1
The comparative example provides a polyvinyl alcohol composition, the type and the manufacturer of the raw materials adopted in the comparative example are the same as those in example 3, and the difference from example 3 is that 0.3kg of white carbon black is added, and 5kg of erucamide is added.
Comparative example 2
This comparative example provides a polyvinyl alcohol composition, the raw material types used in this example are the same as those of example 3, and it differs from example 3 in that 5kg of white carbon black is added and 0.05kg of erucamide is added.
Comparative example 3
This comparative example provides a polyvinyl alcohol composition, the raw material types used in this example are the same as those of example 3, and it differs from example 3 in that 5kg of white carbon black is added and no erucamide is added.
Comparative example 4
This comparative example provides a polyvinyl alcohol composition, the raw material types used in this example are the same as those of example 3, and it differs from example 3 in that 5kg of erucamide was added and no white carbon black was added.
Comparative example 5
This comparative example provides a polyvinyl alcohol composition, the type of material used in this example is the same as that used in example 3, except that 5kg of propylene glycol was added and no polyethylene glycol was added, as in example 3.
Comparative example 6
This comparative example provides a polyvinyl alcohol composition, the type of material used in this example is the same as that used in example 3, except that 40kg of propylene glycol was added and no polyethylene glycol was added, as in example 3.
Examples 8 to 14
Embodiments 8 to 14 provide a polyvinyl alcohol film master batch, which is prepared from the polyvinyl alcohol compositions provided in embodiments 1 to 7, respectively, and specifically includes the following steps:
adding two kinds of polyvinyl alcohol with different polymerization degrees into a high-speed mixer, mixing for 15 minutes at a high speed, then adding a plasticizer, continuously mixing for 30 minutes at a high speed, then adding white carbon black and erucamide, and uniformly stirring for 10 minutes to obtain a polyvinyl alcohol composition; adding the polyvinyl alcohol composition into a double-screw extruder, and extruding and granulating to obtain polyvinyl alcohol film master batches; wherein, in the embodiment 8-9, the processing temperature of the double screw extruder is set to be 80 ℃/90 ℃/140 ℃/150 ℃/170 ℃/180 ℃/180 ℃/180 ℃/170 ℃/160 ℃/160 ℃; in examples 10 to 14, the processing temperature of the twin-screw extruder was set at 80 ℃/90 ℃/120 ℃/140 ℃/140 ℃/140 ℃/140 ℃/140 ℃/140 ℃/160 ℃.
Comparative examples 7 to 12
Comparative examples 7 to 12 each provide a polyvinyl alcohol film master batch prepared from the polyvinyl alcohol compositions provided in comparative examples 1 to 6, and the preparation method is the same as that of examples 10 to 14, and is not described herein again.
Examples 15 to 21
Examples 15 to 21 each provide a polyvinyl alcohol film prepared from the polyvinyl alcohol film master batch provided in examples 8 to 14 by film blowing.
Comparative examples 13 to 18
Comparative examples 7 to 12 each provide a polyvinyl alcohol film having a thickness of 0.2mm, which was prepared from the polyvinyl alcohol film master batch provided in comparative examples 7 to 12, respectively, by film blowing.
Test example 1
The melt index of the polyvinyl alcohol film base batches provided in examples 8 to 9 was measured at 200 ℃/2.16kg, and the melt index of the polyvinyl alcohol film base batches provided in examples 10 to 14 and comparative examples 7 to 12 was measured at 140 ℃/2.16kg, respectively, and the results are shown in Table 1.
TABLE 1 melting behavior data table for polyvinyl alcohol film master batches
As can be seen from Table 1, examples 8 to 14 provided polyvinyl alcohol film master batches having a melt index of between 1.5 and 6, which were suitable for dry blow molding. The melt index of the polyvinyl alcohol film master batch is lower than 1 or higher than 6, and the dry blowing is difficult to carry out, which shows that the processing of the dry blowing film can not be influenced by adding the polyvinyl alcohol film opening agent prepared by the mutual cooperation of the white carbon black and the erucamide into the polyvinyl alcohol film composition.
Test example 2
The film friction coefficients of the polyvinyl alcohol films provided in examples 15 to 21 and comparative examples 13 to 18 were measured to determine whether the films had good or bad film openness, and the smaller the film friction coefficient was, the better the film openness was, and the measurement results are shown in Table 2.
TABLE 2 opening Performance Table of polyvinyl alcohol film
As can be seen from Table 2, examples 15-21 provided polyvinyl alcohol films having significantly lower coefficients of dynamic friction and static friction than comparative examples 13-18, indicating that examples 15-21 had significantly lower opening performance than comparative examples 13-18.
As can be seen from the comparison of examples 15-21 with comparative examples 13-15, when the film opening agent added to the polyvinyl alcohol composition is a mixture of an organic opening agent and an inorganic opening agent, and the mass ratio of the two is (1-3): (10 to 50), the opening performance of the polyvinyl alcohol film is better.
As can be seen from the comparison of examples 15 to 21 with comparative examples 16 to 18, the weight ratio of polyvinyl alcohol to plasticizer in the polyvinyl alcohol composition is (50 to 70): (10-30), the opening performance of the polyvinyl alcohol film prepared by the method is better.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The polyvinyl alcohol film opening agent is characterized by comprising an organic opening agent and an inorganic opening agent, wherein the mass ratio of the organic opening agent to the inorganic opening agent is (1-3): (10-50).
2. The polyvinyl alcohol film opening agent according to claim 1, wherein the organic opening agent is selected from at least one of oleamide, erucamide, paraffin oil and polyethylene wax, preferably erucamide;
and/or the inorganic opening agent is selected from at least one of white carbon black, talcum powder and calcium carbonate, and white carbon black is preferred.
3. A polyvinyl alcohol composition comprising the polyvinyl alcohol film opening agent according to claim 1 or 2.
4. The polyvinyl alcohol composition according to claim 3, comprising the following components in parts by mass: 50-70 parts of polyvinyl alcohol, 10-30 parts of plasticizer and 1.1-5.3 parts of polyvinyl alcohol film opening agent;
preferably, the polyvinyl alcohol film opening agent comprises 0.1-0.3 part of organic opening agent and 1-5 parts of inorganic opening agent in parts by mass.
5. The polyvinyl alcohol composition of claim 4, wherein the plasticizer is an alcohol plasticizer;
preferably, the alcohol plasticizer is selected from at least one of ethylene glycol, propylene glycol, glycerin, polyethylene glycol, sorbitol, pentaerythritol, and mannitol.
6. The polyvinyl alcohol composition as claimed in claim 4, wherein the mass ratio of the inorganic opening agent to the plasticizer is (1-5) to (15-30), preferably (1-2.5): 10.
7. a polyvinyl alcohol film master batch, which is characterized by comprising the polyvinyl alcohol film opening agent of claim 1 or 2 or the polyvinyl alcohol composition of any one of claims 3 to 6.
8. The preparation method of the polyvinyl alcohol film master batch is characterized by comprising the following steps: uniformly mixing polyvinyl alcohol, a plasticizer and a polyvinyl alcohol film opening agent, melting and granulating to obtain polyvinyl alcohol film master batches;
preferably, the melting temperature is 140 to 180 ℃.
9. A polyvinyl alcohol film comprising the polyvinyl alcohol film opening agent according to claim 1 or 2 or the polyvinyl alcohol composition according to any one of claims 3 to 6.
10. The preparation method of the polyvinyl alcohol film is characterized by comprising the following steps: and blowing the polyvinyl alcohol film master batch to obtain the polyvinyl alcohol film.
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