CN109721910A - Plasticizer, polyvinyl alcohol compositions and polyvinyl alcohol film and preparation method thereof - Google Patents
Plasticizer, polyvinyl alcohol compositions and polyvinyl alcohol film and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to polyvinyl alcohol film fields, and in particular, to plasticizer, polyvinyl alcohol compositions and polyvinyl alcohol film and preparation method thereof.The plasticizer contains component A, component B and component C；The component A is one of glycerine, ethylene glycol, polyethylene glycol and pentaerythrite or a variety of；The component B is one of magnesium chloride, magnesium nitrate, calcium chloride, copper sulphate and sodium acetate or a variety of；The component C is water.The present invention enables to the polyvinyl alcohol of wider alcoholysis degree range to be film-made through biaxial tension, and resulting polyvinyl alcohol film mechanical property with higher, optical property and barrier property.
Description
Technical field
The present invention relates to polyvinyl alcohol film fields, and in particular, to plasticizer, polyvinyl alcohol compositions and polyvinyl alcohol
Film and preparation method thereof.
Background technique
Polyvinyl alcohol (PVA) is the non-petroleum base macromolecule that can be prepared from natural gas of industrialized production few in number
Material, application range spread weaving, food, medicine, building, timber processing, papermaking, printing, agricultural, steel, producing high-molecular
The fields such as work.The acid and alkali-resistance and organic solvent resistance of PVA is excellent, has splendid barrier property, and good biocompatibility can give birth to
Object degradation.But because on its strand there are polyhydroxy structure, intramolecular and it is intermolecular produce very strong hydrogen bond, lead to its fusing point
It is close with decomposition temperature, it is difficult thermoplastic processing, therefore its application is main at present or is based on solwution method technique, using solution curtain coating
The disadvantages of method prepares PVA film there is complex steps, and film strength is poor.
Fast (the highest winding of the stretching ratio of biaxial tension method big (cross directional stretch multiplying power is up to 10 times or more), shaping speed
Speed is up to hundreds of ms/min), high production efficiency, and the mechanical strength of obtained film, optical property and the thickness uniformity
More preferably, but film forming is influenced significantly by process condition fluctuations, and film stretch process difficulty is big, has for film raw material
Higher requirement.And due to the particularity of PVA processing, there are no the biaxial tension method process system researchs for PVA, so that
Biaxial tension method prepares PVA film and is difficult to realize.
There are some researchs for PVA plasticising at present, it is desirable to which the plasticity that PVA is improved by the means such as being copolymerized, being blended makes it
It is able to carry out thermoplasticity processing, to reduce its preparation cost, expands its use scope, but the research for thermoplasticity PVA film
Also seldom.It is more at present be all design using melt-processed method prepare PVA film (such as CN106189010A,
CN106189008A, CN101864132A and CN102391598A etc.), but it is all made of the tape casting or blowing prepares film,
Both methods prepares film and comparatively requires raw material and technique all relatively low, and the performance of film is also compared with biaxial tension method
Difference.
CN106189006A proposes to prepare PVA film using biaxial tension method, but its method need to use 95 (mol) %
The PVA raw material of≤alcoholysis degree < 99.9 (mol) %, it is relatively narrow for the applicability of PVA；And the tensile strength of resulting PVA film
It improves limited.
Summary of the invention
The purpose of the present invention is to provide a kind of biaxial tensiones of polyvinyl alcohol that can be suitable for wider alcoholysis degree range
Plasticizer, polyvinyl alcohol compositions and polyvinyl alcohol film of film and preparation method thereof；The resulting polyvinyl alcohol of the present invention
The performances such as film tensile strength all increase.
The present inventor has found unexpectedly, cooperates when by component A of the invention, component B and component C as increasing
When moulding agent, especially under certain content ratio compounding, the two-way drawing of the polyvinyl alcohol of wider alcoholysis degree range can be suitable for
Stretch film；And it has thus completed the present invention.
To achieve the goals above, one aspect of the present invention provides a kind of plasticizer, the plasticizer contain component A, component B and
Component C；The component A is one of glycerine, ethylene glycol, polyethylene glycol and pentaerythrite or a variety of；The component B is chlorine
Change one of magnesium, magnesium nitrate, calcium chloride, copper sulphate and sodium acetate or a variety of；The component C is water.
Second aspect of the present invention provides a kind of polyvinyl alcohol compositions, wherein the composition contains polyvinyl alcohol, plasticising
Agent, lubricant and optional auxiliary agent；The plasticizer is above-mentioned plasticizer.
Third aspect present invention provides a kind of polyvinyl alcohol film containing above-mentioned polyvinyl alcohol compositions.
Fourth aspect present invention provides a kind of preparation method of Biaxially-oriented polyethylene alcohol film, this method comprises:
(1) mixture of above-mentioned composition ingredient is provided；
(2) mixture is subjected to melting extrusion and is cast slab, obtain polyvinyl alcohol slab；
(3) polyvinyl alcohol slab is subjected to biaxial tension to form a film.
Fifth aspect present invention provides polyvinyl alcohol film prepared by the above method.
The present invention enables to the polyvinyl alcohol of wider alcoholysis degree range to be film-made through biaxial tension, and resulting polyvinyl alcohol
Film mechanical property with higher, optical property and barrier property.
Specific embodiment
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
One aspect of the present invention provides a kind of plasticizer, which contains component A, component B and component C；The component A is
One of glycerine, ethylene glycol, polyethylene glycol and pentaerythrite are a variety of；The component B is magnesium chloride, magnesium nitrate, chlorination
One of calcium, copper sulphate and sodium acetate are a variety of；The component C is water.
According to the present invention, the content of the component A, component B and component C can change in a wider range, in order to obtain
It is more conducive to the mechanical property of raising polyvinyl alcohol film, the plasticizer of optical property and barrier property, it is preferable that the component
A, the weight ratio of component B and component C are 20-500:100:80-500, preferably 30-300:100:100-300, for example, 50-
200:100:120-250,80-150:100:150-200.
According to the present invention, the average molecular weight that the polyethylene glycol in the component A has is preferably 200-400.Described group
Dividing A is preferably one of glycerine, the polyethylene glycol that average molecular weight is 200-400 and pentaerythrite or a variety of.
Preferably, the component B is one of magnesium chloride, magnesium nitrate and calcium chloride or a variety of.
In a preferred embodiment of the invention, the component A is glycerine and/or number-average molecular weight is 200-
400 polyethylene glycol, the component B are magnesium chloride and/or magnesium nitrate；Alternatively, the component A is pentaerythrite, the component B
For calcium chloride.
Second aspect of the present invention provides a kind of polyvinyl alcohol compositions, wherein the composition contains polyvinyl alcohol, plasticising
Agent, lubricant and optional auxiliary agent；The plasticizer is above-mentioned plasticizer.
According to the present invention, the plasticizer is as described above, and details are not described herein the present invention.
According to the present invention, in order to obtain mechanical property, optical property and the higher polyvinyl alcohol film of barrier property, preferably
The weight ratio of ground, the polyvinyl alcohol and plasticizer is 100:5-40, preferably 100:10-30, more preferably 100:15-25.
Preferably, the weight ratio of the polyvinyl alcohol and lubricant is 100:0.5-5, preferably 100:1-3.
Wherein, composition of the invention is suitable for the polyvinyl alcohol of wider range alcoholysis degree, the degree of polymerization and partial size, preferably
Ground, the alcoholysis degree of the polyvinyl alcohol are 80-99mol%, and the degree of polymerization is 1500 or more (preferably 1500-2500), and partial size is
90-500μm.The polyvinyl alcohol of low alcoholysis level is also suitable, such as the alcoholysis degree of the polyvinyl alcohol is 80-90mol%, is gathered
Right is 1600-1800, and partial size is 100-300 μm.The polyvinyl alcohol of high alcoholysis degree is also suitable, such as the polyvinyl alcohol
Alcoholysis degree be 95-99mol%, degree of polymerization 1700-2500, partial size be 320-400 μm.
According to the present invention, the lubricant can be selected from a variety of lubricants, it is preferable that the lubricant is poly-
Glycols lubricant, fluoropolymer series lubricant agent, organic silicon lubricant, fatty alcohol type emollients, fatty acid lubrication
Agent, fatty acid ester type emollients, stearic amide series lubricant agent, fatty acid metal soaps lubricant, alkane and oxidation of alkanes class
One of lubricant and micro-and nano-particles series lubricant agent are a variety of.
Wherein, the polyethylene glycol series lubricant agent for example can be the PEG molecule that average molecular weight is 500-50000,
It can also pass through other chemical modifications or physical modification by sealing end, grafting, crosslinking Treatment.
Wherein, the fluoropolymer series lubricant agent for example can be polytetrafluoroethylene (PTFE), Kynoar, polyhexafluoropropylene
At least one of Deng, or other unimodal or multimodal fluoropolymers and crystallization or hemicrystalline fluoropolymer
Object.
Wherein, the organo-silicic oil can be existing various using carbon, silicon atom as molecular backbone, with methyl, benzene
The oligomer or oligomer of the organic groups such as base, alkoxy, vinyl are the compound of side chain.
Wherein, the fatty alcohol type emollients for example can in soft fat alcohol, tallow alcohol, tallow fatty alcohol etc. extremely
Few one kind.
Wherein, the fatty acid lubricant for example can be with stearic acid and/or 12- hydroxy stearic acid.
Wherein, the fatty acid ester type emollients for example can be butyl stearate, stearic acid list glycerolipid, palmitinic acid ten
At least one of six Arrcostabs, tearyl base ester etc..
Wherein, the stearic amide series lubricant agent for example can be stearic amide, oleamide, erucyl amide, n,
At least one of n- ethylene bis stearic acid amide (EBS) etc..
Wherein, the fatty acid metal soaps lubricant for example can be lead stearate, calcium stearate, magnesium stearate, conjunction
At at least one of calcium acetate etc..
Wherein, the alkane and oxidation of alkanes series lubricant agent for example can for atoleine, solid paraffin, polyethylene wax,
At least one of polypropylene wax, ethylene oxide wax etc..
Wherein, the micro-and nano-particles series lubricant agent for example can be powdered rubber and/or aerosil particles.
According to the present invention, the composition can also contain auxiliary agent, and the auxiliary agent can be other to polyvinyl alcohol film
Performance have gain effect, and will not stretching film forming, mechanical property and optical property to polyvinyl alcohol film generate it is unfavorable
The additive of influence.The auxiliary agent for example can be one of antioxidant, acid absorbent, antistatic agent and antitack agent or a variety of.
Wherein, the antioxidant for example can be antioxidant 1010, antioxidant 1076, antioxidant 164, irgasfos 168, resist
At least one of oxygen agent 264 etc..The content of the antioxidant can change in a wider range, the institute relative to 100 parts by weight
Polyvinyl alcohol is stated, the content of the antioxidant is preferably 0.1-1 parts by weight.
Wherein, the acid absorbent can be for example at least one of hydrotalcite, calcium stearate, zinc stearate etc..The suction
The content of sour agent can change in a wider range, relative to the polyvinyl alcohol of 100 parts by weight, the content of the acid absorbent
Preferably 0.1-1 parts by weight.
Wherein, the antistatic agent for example can be sweet for ethoxylated alkylamine, ethoxylated alkyl acid amide, monostearate
At least one of grease, sodium alkyl sulfonate etc..The content of the antistatic agent can change in a wider range, relative to 100
The polyvinyl alcohol of parts by weight, the content of the antistatic agent are preferably 0.1-1 parts by weight.
Wherein, the antitack agent for example can be in silica, calcium carbonate, diatomite, talcum powder, glass microballoon etc.
It is at least one.The content of the antitack agent can change in a wider range, relative to the polyvinyl alcohol of 100 parts by weight, institute
The content for stating antitack agent is preferably 0.1-1 parts by weight.
Third aspect present invention provides a kind of polyvinyl alcohol film containing above-mentioned polyvinyl alcohol compositions.
As long as the polyvinyl alcohol film that the third aspect of the invention provides contains above-mentioned polyvinyl alcohol compositions,
Content for example can be 80-100 weight %.
Fourth aspect present invention provides a kind of preparation method of Biaxially-oriented polyethylene alcohol film, this method comprises:
(1) mixture of above-mentioned composition ingredient is provided；
(2) mixture is subjected to melting extrusion and is cast slab, obtain polyvinyl alcohol slab；
(3) polyvinyl alcohol slab is subjected to biaxial tension to form a film.
According to the present invention, step (1) is mainly to provide the mixture of above-mentioned composition ingredient, in order to subsequent place
Reason forms polyvinyl alcohol film.Preferably, step (1) includes: first to mix polyvinyl alcohol and plasticizer, is then re-introduced into profit
Lubrication prescription and optional auxiliary agent.It is highly preferred that by the condition that polyvinyl alcohol and plasticizer mix include: temperature be 50-90 DEG C
(preferably 60-80 DEG C), time are 0.5-4h (preferably 1-2h).
The mixed process, which can be, is first heated to 50-90 DEG C for polyvinyl alcohol, then introduces plasticizer and is 50- in temperature
90 DEG C of mixing 0.5-4h.Introducing for the plasticizer can be by the way of disposably feeding intake, can also be using the side that feed intake step by step
Formula, in order to improve the dispersion effect of plasticizer and polyvinyl alcohol, it is preferred to use the mode to feed intake step by step, it is preferable that the plasticising
Agent is added in 5-60min and is finished.
It according to the present invention,, can be with before adding lubricant and optional auxiliary agent after polyvinyl alcohol and plasticizer being mixed
The mixture of polyvinyl alcohol and plasticizer is first down to room temperature (such as 20-30 DEG C) and adds lubricant and optional auxiliary agent again, and
After be sufficiently mixed, obtain the mixture of above-mentioned composition ingredient.
According to the present invention, before carrying out step (2), the resulting mixture of step (1) can also be subjected to extruding pelletization and (squeezed
The temperature being granulated out is 100-200 DEG C), resulting master batch is used for the operation of step (2)；It is, of course, preferable to directly by step (1)
Resulting mixture carries out the processing of step (2), to reduce loss of material, especially reduces the loss of plasticizer.
According to the present invention, by step (2) by the mixture carry out melting extrusion and be cast slab can be in casting machine
It carries out, it is preferable that the temperature of the melting extrusion is 100-200 DEG C (preferably 110-160 DEG C)；The curtain coating of the curtain coating slab
Chilling roll temperature is 15-50 DEG C (preferably 20-40 DEG C).
According to the present invention, the structure for the film that the slab die head that the curtain coating slab uses can according to need acquisition is selected
It selects, for example, single layer die can be used when needing to obtain the film with single layer structure；There is multilayer knot when needing to obtain
When film (film with upper epidermis, sandwich layer and layer three-decker) of structure, the compound die head of multilayered structure can be used, and
And at least one layer of (sandwich layer) connects with the extruder hopper equipped with above-mentioned polyvinyl alcohol compositions in the compound die head of multilayered structure
Logical, at least one layer (sandwich layer) in the slab enabled in this way is the polyvinyl alcohol formed by above-mentioned polyvinyl alcohol compositions
Layer, naturally it is also possible to be that the compound die head of the multilayered structure all connects with the extruder hopper equipped with above-mentioned polyvinyl alcohol compositions
Logical, each layer in the slab enabled in this way is all the polyvinyl alcohol layer formed by above-mentioned polyvinyl alcohol compositions.
For this purpose, the polyvinyl alcohol slab is single layer structure or multilayered structure, preferably by upper epidermis, sandwich layer and layer
The three-decker of composition, the upper epidermis, sandwich layer and layer are all the layer that polyvinyl alcohol compositions are formed.
According to the present invention, in step (3), the biaxial tension may include that Synchronos method stretching or the method for fractional steps stretch.Wherein,
The Synchronos method stretching refers to carrying out film longitudinal (MD) simultaneously and laterally (TD) is stretched, and the method for fractional steps stretching refers to elder generation
Film longitudinal stretching is carried out, then carries out film cross directional stretch.
Preferably, it includes first preheating polyvinyl alcohol slab that the Synchronos method, which stretches, then carries out MD and TD simultaneously
It stretches.Preferably, the condition that the Synchronos method stretches includes: that draft temperature is 120-170 DEG C, and MD stretching ratio is 3 times or more
(for example, 3-6 times), TD stretching ratio be 3 times or more (for example, 3-6 times), MD rate of extension for 300%/s or more (for example,
300%/s-500%/s), TD rate of extension is 300%/s or more (for example, 300%/s-500%/s)
Preferably, the method for fractional steps stretching includes: first to preheat polyvinyl alcohol slab, then first carries out MD stretching,
Then progress TD stretching is preheated again.Preferably, the condition that the method for fractional steps stretches includes: that MD draft temperature is 80-100 DEG C, TD
Draft temperature be 120-200 DEG C, MD stretching ratio be 3 times or more (for example, 3-6 times), TD stretching ratio for 3 times or more (such as
Be 3-6 times), MD rate of extension be 100%/s or more (for example, 100%/s-200%/s), TD rate of extension be 100%/s with
Upper (for example, 100%/s-200%/s).
According to the present invention, this method can carry out annealing setting processing to the film after stretching, can also be fixed without this
Shape processing, in the case where carrying out setting processing namely this method further includes carrying out at annealing setting after step (3) to resulting film
The temperature of reason, annealing setting processing is preferably 180-200 DEG C.The time of annealing setting processing is preferably 5-60s.To stretching
Film afterwards, which carries out annealing setting processing, can play the role of improving film dimensions stability.
According to the present invention, this method can also include by resulting polyvinyl alcohol film carry out surface corona processing, cutting edge and
Winding processing, surface corona processing, cutting edge and winding processing are the operation of this field routine, and the present invention has no this particularly
It limits.
Fourth aspect present invention provides polyvinyl alcohol film prepared by the above method.
The present invention resulting polyvinyl alcohol film mechanical property, optical property and barrier property with higher, it is described poly-
The MD tensile strength of alcohol film for example can be 45MPa or more, especially 60MPa or more, preferably 100MPa or more, more
Preferably 100-200MPa；TD tensile strength for example can be 50MPa or more, especially 70MPa or more, preferably 100MPa with
On, more preferably 110-200MPa；Light transmittance is 90% or more, preferably 92-94%；Oxygen transmission rate for example can be 1.5cc/
m2It is hereinafter, preferably 1.4cc/m2It is hereinafter, more preferably 0.05-1.4cc/m2It.
It is described for the resulting polyvinyl alcohol film of polyvinyl alcohol of higher alcoholysis degree (for example, 95-99mol%)
The MD tensile strength of polyvinyl alcohol film is 130MPa or more, preferably 150-170MPa；TD tensile strength is 150MPa or more,
Preferably 170-200MPa；Light transmittance is 90% or more, preferably 92-93%；Oxygen transmission rate is 1.2cc/m2It hereinafter, it is preferred that
For 0.05-0.5cc/m2It.
It is described for the resulting polyvinyl alcohol film of polyvinyl alcohol compared with low alcoholysis level (for example, 80-90mol%)
The MD tensile strength of polyvinyl alcohol film for example can be 45MPa or more, especially 60MPa or more, preferably 100MPa or more,
More preferably 100-130MPa；TD tensile strength for example can be 50MPa or more, especially 70MPa or more, preferably 100MPa
More than, more preferably 120-135MPa；Light transmittance is 90% or more, preferably 92-94%；Oxygen transmission rate is 1.4cc/m2It with
Under, preferably 0.5-1.4cc/m2It.
The present invention will be described in detail by way of examples below.
In following example:
PEG200 is to recover the polyethylene glycol that the average molecular weight of fine chemistry industry research institute is 200 purchased from Tianjin.
PEG400 is to recover the polyethylene glycol that the average molecular weight of fine chemistry industry research institute is 400 purchased from Tianjin.
Tensile strength, elongation at break and the tensile modulus of elasticity of polyvinyl alcohol film are according to GB/T1040.3-2006
Specified in method measure；
The mist degree and light transmittance of polyvinyl alcohol film are that the method according to specified in GB/T 2410-2008 measures；
The surface gloss of polyvinyl alcohol film is that the method according to specified in ASTMD2457-2003 measures；
The oxygen transmission rate of polyvinyl alcohol film is that the method according to specified in ASTM D-3985 measures.
Plasticizer preparation example
By according to the formula in table 1, component A, component B and component C are proportionally mixed, corresponding plasticizer is obtained.
Table 1
Note: the above component A and component B is measured with the pure material of substance listed in table.
Embodiment 1
The present embodiment is for illustrating polyvinyl alcohol compositions and polyvinyl alcohol film and preparation method thereof of the invention.
(1) by 100 weight account polyethylene alcohol, (alcoholysis degree 88mol%, the degree of polymerization 1700, are purchased from Shanxi three by 180 μm of partial size
Dimension group company) 60 DEG C are warming up to, the plasticizer E1 (finishing in 30min) of 15 parts by weight is gradually added dropwise；After finishing, temperature is protected
It holds and is stirred 1h at 50 DEG C.After naturally cooling to 30 DEG C, the Kynoar lubricant that 1 parts by weight are added is (public purchased from 3M
Take charge of the FX5911 trade mark) and 0.25 parts by weight antioxidant 1010 (purchased from Switzerland's vapour bar chemistry (China) Co., Ltd, the same below),
Polyvinyl alcohol compositions are obtained after mixing；
(2) polyvinyl alcohol compositions made from step (1) are added to the model LCR400's of Labtech company, Sweden
Melting extrusion is carried out in the sandwich layer extruder of multilayer extrusion casting machine and upper and lower surface layer extruder and is cast slab, and melting is squeezed
Each section of temperature is 110-160 DEG C out, and curtain coating chilling roll temperature is 25 DEG C, is thus obtained by upper epidermis, sandwich layer and layer structure
At polyvinyl alcohol slab；
(3) above-mentioned polyvinyl alcohol slab is put into the stretching clamp of film biaxial tension equipment, using two-way substep
Stretch film comprising: first polyvinyl alcohol slab is preheated, then first carries out MD stretching, then preheats then progress TD drawing
It stretches；Its condition includes: that the preceding preheating temperature of MD stretching is 90 DEG C, and MD draft temperature is 90 DEG C, and 3 times of MD stretching ratio, film MD is drawn
Stretching rate is 100%/s；Preheating temperature is 140 DEG C before TD is stretched, and TD draft temperature is 140 DEG C, and TD stretching ratio is 4 times, thin
Film TD rate of extension is 100%/s；Then the resulting film of biaxial tension is subjected to annealing setting processing 30s at 180 DEG C, obtained
The film for being 25 μm to average thickness, is made of, each layer raw material is the poly- second of the present embodiment upper epidermis, sandwich layer and layer
Enol composition.Gained biaxially oriented film performance is as shown in table 2.
Embodiment 2
The present embodiment is for illustrating polyvinyl alcohol compositions and polyvinyl alcohol film and preparation method thereof of the invention.
(1) by 100 weight account polyethylene alcohol, (alcoholysis degree 85mol%, the degree of polymerization 1500, are purchased from Shanxi three by 200 μm of partial size
Dimension group company) 70 DEG C are warming up to, the plasticizer E2 (finishing in 25min) of 20 parts by weight is gradually added dropwise；After finishing, temperature is protected
It holds and is stirred 1.5h at 60 DEG C.After naturally cooling to 30 DEG C, the polyethylene glycol lubricant that 2 parts by weight are added (is purchased from Switzerland
Clariant Corporation, average molecular weight 10000), the irgasfos 168 (purchases of the antioxidant 1010 of 0.15 parts by weight and 0.25 parts by weight
From Switzerland vapour bar chemistry (China) Co., Ltd), polyvinyl alcohol compositions are obtained after mixing；
(2) polyvinyl alcohol compositions made from step (1) are added to the model LCR400's of Labtech company, Sweden
Melting extrusion is carried out in the sandwich layer extruder of multilayer extrusion casting machine and upper and lower surface layer extruder and is cast slab, and melting is squeezed
Each section of temperature is 110-160 DEG C out, and curtain coating chilling roll temperature is 20 DEG C, is thus obtained by upper epidermis, sandwich layer and layer structure
At polyvinyl alcohol slab；
(3) above-mentioned polyvinyl alcohol slab is put into the stretching clamp of film biaxial tension equipment, using two-way substep
Stretch film comprising: first polyvinyl alcohol slab is preheated, then first carries out MD stretching, then preheats then progress TD drawing
It stretches；Its condition include: MD stretch before preheating temperature be 100 DEG C, MD draft temperature be 100 DEG C, 4 times of MD stretching ratio, film MD
Rate of extension is 100%/s；Preheating temperature is 135 DEG C before TD is stretched, and TD draft temperature is 135 DEG C, and TD stretching ratio is 5 times,
Film TD rate of extension is 150%/s；The resulting film of biaxial tension is then subjected to annealing setting processing 10s at 200 DEG C,
The film that average thickness is 25 μm is obtained, is made of upper epidermis, sandwich layer and layer, each layer raw material is the poly- of the present embodiment
Vinyl alcohol compositions.Gained biaxially oriented film performance is as shown in table 2.
Embodiment 3
The present embodiment is for illustrating polyvinyl alcohol compositions and polyvinyl alcohol film and preparation method thereof of the invention.
According to method described in embodiment 1, the difference is that:
Step (1): using 25 parts by weight plasticizer E3 replace E1, lubricant using 1 parts by weight stearic acid list
Glyceride (is purchased from 163 trade mark of standing grain major company Atmer)；
Step (3): preheating temperature is 145 DEG C before TD is stretched, and TD draft temperature is 145 DEG C；
The film that average thickness is 25 μm is finally obtained, is made of upper epidermis, sandwich layer and layer, each layer raw material is
The polyvinyl alcohol compositions of the present embodiment.Gained biaxially oriented film performance is as shown in table 2.
Embodiment 4-11
The present embodiment is for illustrating polyvinyl alcohol compositions and polyvinyl alcohol film and preparation method thereof of the invention.
According to method described in embodiment 1, unlike, the plasticizer E4-E11 for the parts by weight such as being respectively adopted replaces E1,
The film that average thickness is 25 μm is finally respectively obtained, is made of upper epidermis, sandwich layer and layer, each layer raw material is this reality
Apply the polyvinyl alcohol compositions of example.Gained biaxially oriented film performance is as shown in table 2.
Embodiment 12
The present embodiment is for illustrating polyvinyl alcohol compositions and polyvinyl alcohol film and preparation method thereof of the invention.
According to method described in embodiment 1, the difference is that, the dosage of the plasticizer is 5 parts by weight；
The film that average thickness is 25 μm is finally obtained, is made of upper epidermis, sandwich layer and layer, each layer raw material is
The polyvinyl alcohol compositions of the present embodiment.Gained biaxially oriented film performance is as shown in table 2.
Embodiment 13
The present embodiment is for illustrating polyvinyl alcohol compositions and polyvinyl alcohol film and preparation method thereof of the invention.
According to method described in embodiment 1, the difference is that, the dosage of the plasticizer is 35 parts by weight；
The film that average thickness is 25 μm is finally obtained, is made of upper epidermis, sandwich layer and layer, each layer raw material is
The polyvinyl alcohol compositions of the present embodiment.Gained biaxially oriented film performance is as shown in table 2.
Embodiment 14
The present embodiment is for illustrating polyvinyl alcohol compositions and polyvinyl alcohol film and preparation method thereof of the invention.
According to method described in embodiment 1, the difference is that:
Step (3) replaces method of fractional steps biaxial tension namely the behaviour of the Synchronos method biaxial tension using Synchronos method biaxial tension
Work includes: first to preheat polyvinyl alcohol slab, then carries out MD simultaneously and stretches and TD stretching；Its condition includes: preheating temperature
Degree is 130 DEG C, and draft temperature is 130 DEG C, and 3.5 times of MD stretching ratio, MD rate of extension is 300%/s, and TD stretching ratio is 3.5
Times, TD rate of extension is 400%/s；
The film that average thickness is 25 μm is finally obtained, is made of upper epidermis, sandwich layer and layer, each layer raw material is
The polyvinyl alcohol compositions of the present embodiment.Gained biaxially oriented film performance is as shown in table 2.
Embodiment 15
The present embodiment is for illustrating polyvinyl alcohol compositions and polyvinyl alcohol film and preparation method thereof of the invention.
According to method as described in example 4, unlike, using the alcoholysis degree 99mol%, poly- purchased from Ningxia Neng Hua company
Right 2000 and 360 μm of partial size polyvinyl alcohol replace embodiment 4 in polyvinyl alcohol.
The film that average thickness is 25 μm is finally obtained, is made of upper epidermis, sandwich layer and layer, each layer raw material is
The polyvinyl alcohol compositions of the present embodiment.Gained biaxially oriented film performance is as shown in table 2.
Embodiment 16
The present embodiment is for illustrating polyvinyl alcohol compositions and polyvinyl alcohol film and preparation method thereof of the invention.
According to method described in embodiment 15, the difference is that:
Step (3) replaces method of fractional steps biaxial tension namely the behaviour of the Synchronos method biaxial tension using Synchronos method biaxial tension
Work includes: first to preheat polyvinyl alcohol slab, then carries out MD simultaneously and stretches and TD stretching；Its condition includes: preheating temperature
Degree is 130 DEG C, and draft temperature is 130 DEG C, and 3.5 times of MD stretching ratio, MD rate of extension is 300%/s, and TD stretching ratio is 3.5
Times, TD rate of extension is 400%/s；
The film that average thickness is 25 μm is finally obtained, is made of upper epidermis, sandwich layer and layer, each layer raw material is
The polyvinyl alcohol compositions of the present embodiment.Gained biaxially oriented film performance is as shown in table 2.
Embodiment 17
The present embodiment is for illustrating polyvinyl alcohol compositions and polyvinyl alcohol film and preparation method thereof of the invention.
According to method described in embodiment 16, the difference is that, using the alcoholysis degree for being purchased from middle petrochemical industry Sichuan vinylon plant
97mol%, the degree of polymerization 1800 and 360 μm of partial size of polyvinyl alcohol replace the polyvinyl alcohol in embodiment 16.
The film that average thickness is 25 μm is finally obtained, is made of upper epidermis, sandwich layer and layer, each layer raw material is
The polyvinyl alcohol compositions of the present embodiment.Gained biaxially oriented film performance is as shown in table 2.
Comparative example 1-5
According to method described in embodiment 1, unlike, the plasticizer DE1-DE5 for the parts by weight such as being respectively adopted replaces E1,
Rupture of membranes occurs in biaxial orientation process for comparative example 1-3, can not stretch, and is unable to get respective films, and comparative example 4-5 is finally respective
The film that average thickness is 25 μm is obtained, is made of upper epidermis, sandwich layer and layer, each layer raw material is the poly- of this comparative example
Vinyl alcohol compositions.Gained biaxially oriented film performance is as shown in table 2.
Comparative example 6-7
According to method described in embodiment 15, unlike, the plasticizer DE4-DE5 for the parts by weight such as being respectively adopted is replaced
E4 finally respectively obtains the film that average thickness is 25 μm, is made of upper epidermis, sandwich layer and layer, each layer raw material is
The polyvinyl alcohol compositions of this comparative example.Gained biaxially oriented film performance is as shown in table 2.
Table 2
It can be seen that by the data of table 2 using plasticizer provided in the present invention, enable to wider alcoholysis degree range
Polyvinyl alcohol be film-made through biaxial tension, prepare resulting polyvinyl alcohol film with high-strength and high every high light transmittance.Wherein, special
Be not under preferred proportion, MD and TD to tensile strength in 100MPa or more, light transmittance is 90% or more, and oxygen transmission rate is equal
For 1.4cc/m2It is following.
The preferred embodiment of the present invention has been described above in detail, and still, the present invention is not limited thereto.In skill of the invention
In art conception range, can with various simple variants of the technical solution of the present invention are made, including each technical characteristic with it is any its
Its suitable method is combined, and it should also be regarded as the disclosure of the present invention for these simple variants and combination, is belonged to
Protection scope of the present invention.
Claims (17)
1. a kind of plasticizer, which is characterized in that the plasticizer contains component A, component B and component C；The component A be glycerine,
One of ethylene glycol, polyethylene glycol and pentaerythrite are a variety of；The component B is magnesium chloride, magnesium nitrate, calcium chloride, sulfuric acid
One of copper and sodium acetate are a variety of；The component C is water.
2. plasticizer according to claim 1, wherein the weight ratio of the component A, component B and component C are 20-500:
100:80-500, preferably 30-300:100:100-300.
3. plasticizer according to claim 1 or 2, wherein the component A is glycerine, average molecular weight 200-400
Polyethylene glycol and one of pentaerythrite or a variety of；
The component B is one of magnesium chloride, magnesium nitrate and calcium chloride or a variety of.
4. a kind of polyvinyl alcohol compositions, wherein the composition contains polyvinyl alcohol, plasticizer, lubricant and optional helps
Agent；The plasticizer is plasticizer described in any one of claim 1-3.
5. composition according to claim 4, wherein the weight ratio of the polyvinyl alcohol and plasticizer is 100:5-40,
Preferably 100:10-30, more preferably 100:15-25；
Preferably, the weight ratio of the polyvinyl alcohol and lubricant is 100:0.5-5, preferably 100:1-3.
6. composition according to claim 4 or 5, wherein the alcoholysis degree of the polyvinyl alcohol is 80-99mol%, polymerization
Degree is 1500 or more, and partial size is 90-500 μm；
Preferably, the alcoholysis degree of the polyvinyl alcohol is 80-90mol%, and degree of polymerization 1600-1800, partial size is 100-300 μ
m；
Preferably, the alcoholysis degree of the polyvinyl alcohol is 95-99mol%, and degree of polymerization 1700-2500, partial size is 320-400 μ
m。
7. composition according to any one of claims 4 to 6, wherein the lubricant is polyethylene glycols lubrication
Agent, fluoropolymer series lubricant agent, organic silicon lubricant, fatty alcohol type emollients, fatty acid lubricant, fatty acid ester
Lubricant, stearic amide series lubricant agent, fatty acid metal soaps lubricant, alkane and oxidation of alkanes series lubricant agent and micro-nano
One of particle series lubricant agent is a variety of.
8. the composition according to any one of claim 4-7, wherein the auxiliary agent be antioxidant, acid absorbent, resist it is quiet
One of electric agent and antitack agent are a variety of.
9. a kind of polyvinyl alcohol film containing composition described in any one of claim 4-8.
10. a kind of preparation method of Biaxially-oriented polyethylene alcohol film, this method comprises:
(1) mixture of composition ingredient described in any one of claim 4-8 is provided；
(2) mixture is subjected to melting extrusion and is cast slab, obtain polyvinyl alcohol slab；
(3) polyvinyl alcohol slab is subjected to biaxial tension to form a film.
11. according to the method described in claim 10, wherein, step (1) includes: first to mix polyvinyl alcohol and plasticizer
It closes, is then re-introduced into lubricant and optional auxiliary agent；
Wherein, by the condition that polyvinyl alcohol and plasticizer mix include: temperature be 50-90 DEG C, time 0.5-4h.
12. method described in 0 or 11 according to claim 1, wherein the temperature of the melting extrusion is 100-200 DEG C；The stream
The curtain coating chilling roll temperature for prolonging slab is 15-50 DEG C.
13. method described in any one of 0-12 according to claim 1, wherein the polyvinyl alcohol slab is single layer structure
Or multilayered structure, the three-decker being preferably made of upper epidermis, sandwich layer and layer.
14. method described in any one of 0-13 according to claim 1, wherein the biaxial tension includes that Synchronos method stretches
Or the method for fractional steps stretches；
It includes first preheating polyvinyl alcohol slab that the Synchronos method, which stretches, then carries out MD and TD simultaneously and stretches；It is described same
Footwork stretch condition include: draft temperature be 120-170 DEG C, MD stretching ratio be 3 times or more, TD stretching ratio be 3 times with
On, MD rate of extension is 300%/s or more, and TD rate of extension is 300%/s or more；
Method of fractional steps stretching includes: first to preheat polyvinyl alcohol slab, then first carries out MD stretching, then is preheated and laggard
Row TD is stretched；The condition that the method for fractional steps stretches includes: that MD draft temperature is 80-100 DEG C, and TD draft temperature is 120-200 DEG C,
MD stretching ratio is 3 times or more, and TD stretching ratio is 3 times or more, and MD rate of extension is 100%/s or more, and TD rate of extension is
100%/s or more.
15. method described in 0 or 14 according to claim 1, wherein this method further include after step (3) to resulting film into
Row annealing setting processing, the temperature of annealing setting processing is 180-200 DEG C.
16. polyvinyl alcohol film made from the method as described in any one of claim 10-15.
17. polyvinyl alcohol film according to claim 16, wherein the MD tensile strength of the polyvinyl alcohol film is
45MPa or more, preferably 60MPa or more, more preferably 100MPa or more；TD tensile strength is 50MPa or more, preferably
70MPa or more, more preferably 100MPa or more；Light transmittance is 90% or more, preferably 92-94%；Oxygen transmission rate is 1.5cc/
m2It is hereinafter, preferably 1.4cc/m2It is following.
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