CN111205577A - Medium-temperature water-soluble PVA composition for melt tape casting film formation, particles thereof and preparation method thereof - Google Patents
Medium-temperature water-soluble PVA composition for melt tape casting film formation, particles thereof and preparation method thereof Download PDFInfo
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- C08L29/00—Compositions 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; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
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- 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
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Abstract
The invention belongs to the field of biodegradable materials, and discloses a medium-temperature water-soluble PVA composition for melt tape casting film formation, particles thereof and a preparation method thereof. The medium-temperature water-soluble PVA composition for melt casting film formation comprises: PVA, a plasticizer, a thermal decomposition inhibitor, a thermal oxygen aging resistant agent, a lubricant, an organosilicon water repellent and a zwitterionic surfactant; relative to 100 parts by weight of PVA, the content of the plasticizer is 15-55 parts by weight, the content of the thermal decomposition inhibitor is 1-8 parts by weight, the content of the thermal oxidation aging resistant agent is 0.5-6 parts by weight, the content of the lubricant is 2-6 parts by weight, the content of the organosilicon water repellent is 0.1-1 part by weight (in terms of solid content), and the content of the zwitterionic surfactant is 0.1-2 parts by weight (in terms of solid content). The invention realizes the melt tape casting film formation of PVA, and simultaneously the initial water-soluble temperature of the medium-temperature water-soluble PVA particles is above 40 ℃ after the melt tape casting film formation.
Description
Technical Field
The invention relates to the field of biodegradable materials, in particular to a medium-temperature water-soluble PVA composition for melt tape casting film formation, particles thereof and a preparation method thereof.
Background
In the field of packaging, plastics are the most widely used packaging materials, but with the growing environmental problems, energy depletion and food safety threats, people aim at biodegradable materials. Polyvinyl alcohol (PVA) has the performance and characteristics of traditional plastics, can be split and degraded under natural conditions, and finally biodegraded into carbon dioxide and water which return to natural environment, thus being a biodegradable environment-friendly material.
The PVA water-soluble film is mostly produced and prepared by a solution casting method, the processing cost is extremely high, the productivity is low, a melt casting film forming method using the traditional plastic film bag is a processing mode with low energy consumption and high productivity, but the melt fluidity is worse because the melting temperature of the PVA is close to the decomposition temperature, the melt casting film forming processing difficulty is larger, and the PVA water-soluble film has extremely high requirements on processing equipment.
The PVA low-temperature water-soluble film is a film which begins to dissolve in water at a lower temperature (23 ℃), is also called a normal-temperature water-soluble film and is prepared from a partial alcoholysis type PVA; the PVA high-temperature water-soluble film is a film which begins to dissolve in water at a higher temperature (80 ℃) and is made of the PVA of a complete alcoholysis type.
Therefore, it is desirable to provide a medium-temperature water-soluble PVA film which is low in film forming difficulty by a melt casting method, easy to industrialize and has wide application prospects.
Disclosure of Invention
The invention aims to prepare a film with the water-soluble temperature of more than 40 ℃ by using partial alcoholysis type PVA through a melt casting method, and provides a medium-temperature water-soluble PVA composition formed by a melt casting method and particles thereof and a preparation method thereof in order to overcome the problem that a medium-temperature water-soluble PVA raw material is easy to decompose and carbonize in the thermoplastic processing process.
The raw material used by the medium-temperature water-soluble PVA composition formed by the melt casting method is a low-temperature water-soluble PVA raw material, namely partial alcoholysis type PVA, and the initial water-soluble temperature of medium-temperature water-soluble PVA particles prepared by a blending modification mode is above 40 ℃. The medium-temperature water-soluble PVA composition and the particles for film formation by the melt casting method provided by the invention do not decompose in the preparation process, the produced particles have smooth surfaces, good melt fluidity and high melt flow rate, the film formation by the melt casting method is facilitated, and the continuous granulation of the medium-temperature water-soluble PVA raw material and the film formation by the melt casting method are realized.
In order to achieve the above object, a first aspect of the present invention provides a melt-cast film-forming medium-temperature water-soluble PVA composition comprising: PVA, a plasticizer, a thermal decomposition inhibitor, a thermal oxygen aging resistant agent, a lubricant, an organosilicon water repellent and a zwitterionic surfactant;
relative to 100 parts by weight of PVA, the content of the plasticizer is 15-55 parts by weight, the content of the thermal decomposition inhibitor is 1-8 parts by weight, the content of the thermal oxidation aging resistant agent is 0.5-6 parts by weight, the content of the lubricant is 2-6 parts by weight, the content of the organosilicon water repellent is 0.1-2 parts by weight (in terms of solid content), and the content of the zwitterionic surfactant is 0.1-2 parts by weight (in terms of solid content).
Preferably, the medium temperature is a temperature of not less than 40 ℃, more preferably 40 to 50 ℃.
Preferably, the content of the plasticizer is 25-45 parts by weight, the content of the thermal decomposition inhibitor is 3-6 parts by weight, the content of the thermal oxidation aging resistant agent is 1-4 parts by weight, the content of the lubricant is 2-4 parts by weight, the content of the organosilicon water repellent agent is 0.5-1.5 parts by weight, and the content of the zwitterionic surfactant is 1-1.5 parts by weight (in terms of solid content) relative to 100 parts by weight of PVA.
Preferably, the degree of polymerization of the PVA is 300-2600.
Preferably, the alcoholysis degree of the PVA is more than or equal to 88 percent.
Preferably, the plasticizer is one or more of sorbitol, ethylene glycol, glycerol, diethanolamine, triethanolamine, diglycerol, triglycerol, polyethylene glycol 200, and polyethylene glycol 400.
Preferably, the thermal decomposition inhibitor is one or more of an organotin stabilizer, a rare earth stabilizer, aluminum distearate, barium stearate, trialkyl phosphite, butyl epoxy stearate, and magnesium hydroxide.
Preferably, the anti-thermal oxidative aging agent is two or more of antioxidants 697, 1024, 1076, 1098, 1010, 626, 168, DLTP and DSTP.
Preferably, the lubricant is one or more of liquid paraffin, polyethylene wax, oxidized polyethylene wax, hardened oil, triglycerol monostearate, and pentaerythritol stearate.
Preferably, the organosilicon water repellent is one or more of SHP-50, SHP-60, HF-6002, SEAL80 and BS 4004.
Preferably, the zwitterionic surfactant is cocamidopropyl betaine, cocamidopropyl hydroxysultaine, sodium lauroamphoacetate, lauryl dimethyl amine oxide or lauramidopropyl amine oxide.
In a second aspect, the present invention provides a method for preparing medium-temperature water-soluble PVA particles by melt casting to form a film, the method comprising:
the intermediate temperature water-soluble PVA composition which is subjected to melt tape casting film forming is subjected to material mixing, granulation and molding.
In a third aspect, the present invention provides melt-cast film-forming medium-temperature water-soluble PVA particles prepared by the method of the present invention.
Preferably, the water content of the medium-temperature water-soluble PVA particles is 0.1-0.5 wt%.
Preferably, the melt flow rate of the medium-temperature water-soluble PVA particles formed into the film by the melt casting method under the load of 2.16kg and at 220 ℃ is 15-25g/10 min.
Preferably, the initial water-soluble temperature of the medium-temperature water-soluble PVA particles is more than or equal to 40 ℃, and more preferably 40-50 ℃.
Compared with the prior art, the invention has the following beneficial effects:
1. the medium-temperature water-soluble PVA composition formed by the melt casting method disclosed by the invention has the advantages that the initial water-soluble temperature of part of alcoholysis type PVA raw material is increased to more than 40 ℃, and the use temperature of a medium-temperature water-soluble film formed by thermoplastic molding is increased;
2. the medium-temperature water-soluble PVA composition formed by the melt casting method overcomes the problem that a part of alcoholysis type PVA raw material is easy to decompose and carbonize in the thermoplastic processing process, realizes the thermoplastic processing of PVA, and can be formed into a film by the melt casting method;
3. when the medium-temperature water-soluble PVA composition is subjected to film forming by a melt casting method, compared with the film forming by a solution casting method, the medium-temperature water-soluble PVA composition has the characteristics of small investment, high productivity, low energy consumption and the like, and is beneficial to industrial production of the film forming by the PVA melt casting method;
4. the medium-temperature water-soluble PVA composition formed by the melt casting method and the PVA formed by the particles have excellent plastic performance; the packaging bag is suitable for packaging products, is particularly suitable for various packaging bags and/or sealing bags, and is particularly suitable for express bags, hand bags, vest bags, rope-penetrating bags, flat bags, buckle bags, zipper bags, edge sealing bags, hand bags, rope drawing bags and the like.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The present invention will be described in detail below by way of examples. In the following examples, each material used was commercially available unless otherwise specified, and the method used was a conventional method in the art unless otherwise specified.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The term "medium-temperature water-soluble film" in the present invention means: the initial water-soluble temperature is a water-soluble film with a medium temperature (40 ℃) above.
In a first aspect, the present invention provides a melt-cast film-forming medium temperature water-soluble PVA composition comprising: PVA, a plasticizer, a thermal decomposition inhibitor, a thermal oxygen aging resistant agent, a lubricant, an organosilicon water repellent and a zwitterionic surfactant;
relative to 100 parts by weight of PVA, the content of the plasticizer is 15-55 parts by weight, the content of the thermal decomposition inhibitor is 1-8 parts by weight, the content of the thermal oxidation aging resistant agent is 0.5-6 parts by weight, the content of the lubricant is 2-6 parts by weight, the content of the organosilicon water repellent is 0.1-2 parts by weight (in terms of solid content), and the content of the zwitterionic surfactant is 0.1-2 parts by weight (in terms of solid content).
In the present invention, preferably, the medium temperature is a temperature of not less than 40 ℃; more preferably, the medium temperature is 40-50 ℃.
By optimizing the components and the proportion of the medium-temperature water-soluble PVA composition for melt casting film formation, the addition amount of a plasticizer is increased, the addition amounts of a thermal decomposition inhibitor, an anti-thermal-oxidative aging agent, a lubricant, an organic silicon water repellent and a zwitterionic surfactant are increased, and on the premise of realizing the possibility of melt casting film formation, the melting point of PVA is reduced, the melt flow rate is increased, and the difficulty of melt casting processing is further reduced.
In order to further realize the possibility of melt casting processing, preferably, the content of the plasticizer is 25 to 45 parts by weight, the content of the thermal decomposition inhibitor is 3 to 6 parts by weight, the content of the thermal oxidation aging resistant agent is 1 to 4 parts by weight, the content of the lubricant is 2 to 4 parts by weight, the content of the organosilicon water repellent is 0.5 to 1.5 parts by weight (in terms of solid content), and the content of the zwitterionic surfactant is 1 to 1.5 parts by weight (in terms of solid content) relative to 100 parts by weight of PVA.
The PVA raw material is not particularly specified, and various commercially available PVAs can be used, for example, the partial alcoholysis type PVA specified in GB 12010.1-89, which is the most widely used naming mode in domestic industry at present, and other naming modes in the market at present, such as the naming mode specified in GBT 12010.1-2008 and the naming mode not used domestically, can be converted into the naming mode specified in GB 12010.1-89 according to corresponding technical indexes. In the present invention, it is preferable that the PVA has a partial alcoholysis type PVA as specified in GB 12010.1-89, a degree of alcoholysis of 88%, a degree of polymerization of 300-.
In the present invention, the polymerization degree of the PVA is preferably 300-2600, more preferably 500-2400.
The plasticizer is not particularly limited, and may be various plasticizers commonly used in the art, and may be determined by those skilled in the art according to the actual use requirement, and may be, for example, a small molecule polyol, a polyol ether, a fatty alcohol amine, or the like. In the present invention, preferably, the plasticizer is one or more of sorbitol, ethylene glycol, glycerin, diethanolamine, triethanolamine, diglycerin, triglycerol, polyethylene glycol 200, and polyethylene glycol 400.
The thermal decomposition inhibitor is not particularly limited, and may be various thermal decomposition inhibitors or stabilizers commonly used in the art, and in order to further ensure that the PVA is not decomposed and carbonized during the twin-screw granulation process, and to inhibit the decomposition of the PVA and provide a certain internal and external lubrication effect, in the present invention, it is preferable that the thermal decomposition inhibitor is one or more of an organic tin stabilizer, a rare earth stabilizer, aluminum distearate, barium stearate, trialkyl phosphite, butyl epoxystearate, and magnesium hydroxide.
The antioxidant is not particularly limited, and may be various single-component antioxidants or antioxidants commonly used in the art, and in order to further ensure that PVA eliminates generated radicals, promotes decomposition of hydroperoxide, prevents chain reaction, and retards or inhibits polymer oxidation during twin-screw granulation and particle storage and use, in the present invention, preferably, the antioxidant is two or more of antioxidants 697, 1024, 1076, 1098, 1010, 626, 168, DLTP, and DSTP.
The lubricant is not particularly limited, and in the present invention, the intermediate temperature water-soluble PVA for melt casting film formation is used to improve the processability during granulation, and to increase the melt flow rate of the particles to some extent. Preferably, the lubricant is one or more of liquid paraffin, polyethylene wax, oxidized polyethylene wax, hardened oil, triglycerol monostearate, and pentaerythritol stearate.
The organic silicon water repellent is not particularly limited, and in the invention, the initial water-soluble temperature of the partially alcoholysis type PVA is increased by introducing the organic silicon water repellent, so that the water absorption of the PVA surface to water is prevented, and the water absorption of PVA particles and a film is reduced. Meanwhile, active substances in the organic silicon water repellent are released in time after meeting water, and a hydrophobic protective layer is formed on the surfaces of the PVA particles and the membrane. Preferably, the organosilicon water repellent is one or more of SHP-50, SHP-60, HF-6002, SEAL80 and BS 4004.
The above-mentioned zwitterionic surfactant is not particularly limited, and in the present invention, the melt flow rate of the particles is further increased by adding a certain amount of the zwitterionic surfactant. Preferably, the zwitterionic surfactant is cocamidopropyl betaine, cocamidopropyl hydroxysultaine, sodium lauroamphoacetate, lauryl dimethyl amine oxide or lauramidopropyl amine oxide.
In a second aspect, the present invention provides a method for preparing medium-temperature water-soluble PVA particles by melt casting to form a film, the method comprising:
and mixing the medium-temperature water-soluble PVA composition subjected to melt tape casting film formation, and granulating and forming.
In the method of the present invention, the preparation method of the medium-temperature water-soluble PVA particles for melt-casting film formation is not particularly limited, and may be various preparation methods conventionally adopted by those skilled in the art, and details thereof are omitted. In one embodiment of the invention, the preparation is carried out according to the following steps:
(1) stirring all the compositions in a high-speed mixer at normal temperature for 5-20 minutes;
(2) and extruding and granulating by using a parallel double-screw granulator set to obtain the medium-temperature water-soluble PVA particles for melt tape casting film formation.
In the specific embodiment of the invention, the temperature of each section of the double-screw granulator unit is 70-210 ℃, and the screw rotating speed is 200-450 rpm.
In a third aspect, the present invention provides melt-cast film-forming medium-temperature water-soluble PVA particles prepared by the above method.
In consideration of practical conditions of the production equipment of the medium-temperature water-soluble PVA particles for melt-casting film formation, and convenience and feasibility analysis of subsequent use, in the method of the invention, the water content of the medium-temperature water-soluble PVA particles for melt-casting film formation is preferably 0.1-0.5 wt%.
For the feasibility of the medium-temperature water-soluble PVA particles for melt-casting film formation in the subsequent use process, the melt flow rate of the medium-temperature water-soluble PVA particles for melt-casting film formation at 220 ℃ under the load of 2.16kg is preferably 15-25g/10 min.
In order to increase the service temperature of the medium-temperature water-soluble PVA particles after thermoplastic processing into film bags, the initial water-soluble temperature of the medium-temperature water-soluble PVA particles is preferably more than or equal to 40 ℃, and more preferably 40-50 ℃.
The present invention will be described in detail below with reference to examples, but the present invention is not limited to the following examples.
All the starting materials used in the examples are commercially available, except where otherwise indicated.
Performance evaluation method:
the prepared modified particles are subjected to a water content test on medium-temperature water-soluble PVA particles formed by a melt casting method according to the national standard GB/T6284-2006, and the melt flow rate of the modified particles is tested according to the national standard GB 3682-2000. The initial water-soluble temperature test method comprises the following steps: taking a certain amount of intermediate-temperature water-soluble PVA particles which are dried at 105 ℃ and have water removed, stirring the intermediate-temperature water-soluble PVA particles in water with different water temperatures for 4 hours at a speed of 100r/min, drying and weighing the intermediate-temperature water-soluble PVA particles, wherein the lowest water temperature with the mass loss rate of more than 2 wt% is the initial water-soluble temperature of the PVA particles.
Example 1
A mid-temperature water-soluble PVA composition melt cast into a film comprising:
PVA1788100 weight parts, sorbitol 25 weight parts, organotin heat stabilizer 2 weight parts, aluminum distearate 2 weight parts, antioxidant 10102 weight parts, DSTP 1 weight parts, polyethylene wax 2 weight parts, SHP-601 weight parts, and cocamidopropyl hydroxysultaine 1 weight parts.
Example 2
A mid-temperature water-soluble PVA composition melt cast into a film comprising:
PVA2088100 parts by weight, ethylene glycol 15 parts by weight, glycerin 20 parts by weight, rare earth thermal stabilizer 2 parts by weight, barium stearate 3 parts by weight, antioxidant 6973 parts by weight, 1680.5 parts by weight, pentaerythritol stearate 2 parts by weight, SHP-501.5 parts by weight, and cocamidopropyl betaine 1.5 parts by weight.
Example 3
A mid-temperature water-soluble PVA composition melt cast into a film comprising:
50 parts of PVA228850 parts, 178850 parts of PVA, 15 parts of diethanolamine, 25 parts of triethanolamine, 2 parts of trialkyl phosphite, 1 part of epoxy butyl stearate, 10243 parts of antioxidant, 6261 parts of pentaerythritol stearate, 2 parts of SEAL801.5 parts of lauryl dimethyl amine oxide and 1.5 parts of lauryl dimethyl amine oxide.
Example 4
A mid-temperature water-soluble PVA composition melt cast into a film comprising:
PVA248840 parts by weight, PVA178860 parts by weight, triethanolamine 15 parts by weight, polyethylene glycol 40030 parts by weight, magnesium hydroxide 3 parts by weight, epoxy butyl stearate 2 parts by weight, antioxidant 10760.5 parts by weight, DLTP 1 parts by weight, liquid paraffin 2 parts by weight, HF-60021 parts by weight, and sodium lauroamphoacetate 1 part by weight.
Example 5
A mid-temperature water-soluble PVA composition melt cast into a film comprising:
PVA268840 parts by weight, PVA058860 parts by weight, diglyceride 15 parts by weight, sorbitol 20 parts by weight, rare earth stabilizer 3 parts by weight, magnesium hydroxide 2 parts by weight, antioxidant 10981.5 parts by weight, DLTP 2 parts by weight, oxidized polyethylene wax 2 parts by weight, BS40041 parts by weight, and lauramidopropyl amine oxide 1 part by weight.
Example 6
A mid-temperature water-soluble PVA composition melt cast into a film comprising:
80 parts of PVA178880, 20 parts of PVA038820, 20025 parts of polyethylene glycol, 10 parts of ethylene glycol, 3 parts of aluminum distearate, 2 parts of magnesium hydroxide, 6972 parts of antioxidant, 6261 parts of hardened oil, 2 parts of SHP-601 and 1 part of cocamidopropyl hydroxysulfobetaine.
Example 7
A mid-temperature water-soluble PVA composition melt cast into a film comprising:
208860 parts of PVA, 058840 parts of PVA, 15 parts of triglycerol, 15 parts of diethanolamine, 3 parts of aluminum distearate, 2 parts of epoxy butyl stearate, 10242 parts of antioxidant, 1681 part of triglycerol monostearate, 801.5 parts of SEAL and 1.5 parts of dodecyl dimethyl amine oxide.
Example 8
A mid-temperature water-soluble PVA composition melt cast into a film comprising:
50 parts of PVA248850, 10 parts of sorbitol, 15 parts of triglycerol, 15 parts of diethanolamine, 4 parts of epoxy butyl stearate, 2 parts of magnesium hydroxide, 10980.5 parts of antioxidant, 1680.5 part of pentaerythritol stearate, 4 parts of BS40041 and 1 part of lauramidopropyl amine oxide.
Example 9
A mid-temperature water-soluble PVA composition melt cast into a film comprising:
PVA268880 parts by weight, PVA228820 parts by weight, ethylene glycol 15 parts by weight, diglycerol 10 parts by weight, trialkyl phosphite 3 parts by weight, antioxidant 6981.5 parts by weight, 1680.5 parts by weight, hardened oil 4 parts by weight, SHP-501 parts by weight, and cocamidopropyl betaine 1 part by weight.
Example 10
A mid-temperature water-soluble PVA composition melt cast into a film comprising:
PVA2488100 weight parts, glycerol 15 weight parts, polyethylene glycol 20015 weight parts, barium stearate 3 weight parts, epoxy butyl stearate 1 weight parts, antioxidant 6981.5 weight parts, antioxidant 10241 weight parts, DLTP 0.5 weight parts, hardened oil 4 weight parts, HF-60021.5 weight parts, and sodium lauroamphoacetate 1.5 weight parts.
Comparative example 1:
PVA1788100 weight parts, sorbitol 10 weight parts, organic tin heat stabilizer 4 weight parts, aluminum distearate 5 weight parts, antioxidant 10104 weight parts, DSTP 3 weight parts, polyethylene wax 7 weight parts, SHP-603 weight parts, and cocamidopropyl hydroxysulfobetaine 3 weight parts.
Comparative example 2:
PVA1788100 weight parts, sorbitol 25 weight parts, organotin heat stabilizer 2 weight parts, aluminum distearate 2 weight parts, antioxidant 10102 weight parts, DSTP 1 weight parts, and polyethylene wax 2 weight parts.
The above examples 1 to 10 and comparative examples 1 and 2 were prepared according to the following procedure:
(1) stirring all the components in a high-speed mixer at normal temperature for 15 minutes;
(2) extruding and granulating by using a parallel double-screw granulator set to obtain medium-temperature water-soluble PVA particles for melt casting film formation; wherein, the temperature of each section of the double-screw granulator set is as follows: first zone 90 deg.C, second zone 130 deg.C, third zone 160 deg.C, fourth zone 170 deg.C, fifth zone 175 deg.C, sixth zone 185 deg.C, seventh zone 195 deg.C, eighth zone 200 deg.C, ninth zone 200 deg.C, tenth zone 195 deg.C, eleventh zone 195 deg.C, twelfth zone 190 deg.C, thirteenth zone 190 deg.C, and head 190 deg.C; setting the screw rotation speed at 280 rpm;
the medium temperature water-soluble PVA particles S1-S10 and D1 and D2 which were melt-cast into films were tested, and the results are shown in Table 1 below.
TABLE 1
As can be seen from Table 1, the moisture content of the medium-temperature water-soluble PVA particles for melt-cast film formation according to the present invention is relatively low, and in a stable range, the thermoplastic processing is not affected, and blisters are not generated.
The melt flow rate of the examples S1-S10 was 15-25g/10min, the flowability was higher, and the processing was more facilitated. The melt flow rate of comparative example 1 was small and greatly different from those of S1 to S10, and particles were decomposed during granulation, and yellowness was large, which was not suitable for melt casting process. The difference of the comparative example 2 to the example 1 is that the melt flow rate is less than that of the example 1 without adding the organosilicon water repellent and the zwitterionic surfactant, which shows that the organosilicon water repellent and the zwitterionic surfactant obviously improve the melt flow rate and are more beneficial to melt casting film formation.
The initial water-soluble temperature of the examples S1-S10 is higher than 40 ℃, and the use temperature after film forming is improved. The initial water-soluble temperature of the comparative examples D1 and D2 is below room temperature (23 ℃), which shows that the water-soluble performance is not moderate, and the difference between D2 and S1 is that the organosilicon water repellent and the zwitterionic surfactant are not added, which shows that the organosilicon water repellent and the zwitterionic surfactant act together with other auxiliary agents, which not only can improve the melt flow rate, but also can improve the service temperature of the film after being formed to be above 40 ℃.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (13)
1. A medium-temperature water-soluble PVA composition for melt-casting film formation is characterized by comprising the following components in percentage by weight: PVA, a plasticizer, a thermal decomposition inhibitor, a thermal oxygen aging resistant agent, a lubricant, an organosilicon water repellent and a zwitterionic surfactant;
relative to 100 parts by weight of PVA, the content of the plasticizer is 15-55 parts by weight, the content of the thermal decomposition inhibitor is 1-8 parts by weight, the content of the thermal oxidation aging resistant agent is 0.5-6 parts by weight, the content of the lubricant is 2-6 parts by weight, the content of the organosilicon water repellent is 0.1-2 parts by weight (in terms of solid content), and the content of the zwitterionic surfactant is 0.1-2 parts by weight (in terms of solid content).
2. A medium-temperature water-soluble PVA composition according to claim 1, wherein said plasticizer is contained in an amount of 25 to 45 parts by weight, said thermal decomposition inhibitor is contained in an amount of 3 to 6 parts by weight, said thermal aging inhibitor is contained in an amount of 1 to 4 parts by weight, said lubricant is contained in an amount of 2 to 4 parts by weight, said silicone water repellent is contained in an amount of 0.5 to 1.5 parts by weight (in terms of solid content), and said zwitterionic surfactant is contained in an amount of 1 to 1.5 parts by weight (in terms of solid content), with respect to 100 parts by weight of PVA.
3. A medium temperature water-soluble PVA composition for melt cast film formation according to claim 1, wherein the medium temperature is a temperature of not less than 40 ℃, more preferably 40-50 ℃.
4. A medium-temperature water-soluble PVA composition film-formed by a melt casting method according to any one of claims 1 to 3, wherein the degree of polymerization of said PVA is 300-2600;
preferably, the alcoholysis degree of the PVA is more than or equal to 88 percent.
5. A melt-cast film-forming moderate temperature water soluble PVA composition according to any one of claims 1 to 3, wherein said plasticizer is one or more of sorbitol, ethylene glycol, glycerol, diethanolamine, triethanolamine, diglycerol, triglycerol, polyethylene glycol 200 and polyethylene glycol 400.
6. A mid-temperature water soluble PVA composition melt-cast into a film according to any one of claims 1 to 3, wherein the thermal decomposition inhibitor is one or more of an organotin stabilizer, a rare earth stabilizer, aluminum distearate, barium stearate, trialkyl phosphite, butyl epoxy stearate and magnesium hydroxide.
7. A medium temperature water soluble PVA composition melt cast into film according to any one of claims 1 to 3, wherein the thermal aging resistant agent is two or more of antioxidants 697, 1024, 1076, 1098, 1010, 626, 168, DLTP and DSTP.
8. A medium temperature water soluble PVA composition melt cast into a film according to any one of claims 1 to 3, wherein the lubricant is one or more of liquid paraffin, polyethylene wax, oxidized polyethylene wax, hardened oil, triglycerol monostearate and pentaerythritol stearate.
9. A medium temperature water soluble PVA composition melt cast into a film according to any one of claims 1 to 3 wherein the silicone hydrophober is one or more of SHP-50, SHP-60, HF-6002, SEAL80 and BS 4004.
10. A medium temperature water soluble PVA composition melt cast into a film according to any one of claims 1 to 3, wherein the zwitterionic surfactant is cocamidopropyl betaine, cocamidopropyl hydroxysultaine, sodium lauroamphoacetate, lauryl dimethyl amine oxide or lauramidopropyl amine oxide.
11. A preparation method of medium-temperature water-soluble PVA particles for melt casting film formation is characterized by comprising the following steps:
a step of mixing, granulating and forming the medium-temperature water-soluble PVA composition which is melt-cast into a film according to any one of claims 1 to 10.
12. Melt-cast film-forming medium-temperature water-soluble PVA particles prepared by the method of claim 11.
13. Medium-temperature water-soluble PVA particles melt-cast into a film according to claim 12,
preferably, the water content of the medium-temperature water-soluble PVA particles is 0.1-0.5 wt%;
preferably, the melt flow rate of the medium-temperature water-soluble PVA particles formed into the film by the melt casting method under the load of 2.16kg and the temperature of 220 ℃ is 15-25g/10 min;
preferably, the initial water-soluble temperature of the medium-temperature water-soluble PVA particles is more than or equal to 40 ℃, and more preferably 40-50 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022145441A1 (en) * | 2020-12-28 | 2022-07-07 | 株式会社クラレ | Polyvinyl alcohol film, polarizing film using same, and polarizing plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022145441A1 (en) * | 2020-12-28 | 2022-07-07 | 株式会社クラレ | Polyvinyl alcohol film, polarizing film using same, and polarizing plate |
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