CN117106289A

CN117106289A - Thermoplastic composite laminated material and preparation method thereof

Info

Publication number: CN117106289A
Application number: CN202311080487.4A
Authority: CN
Inventors: 郝树春; 郁志宏
Original assignee: Shanghai Fengzhi New Material Technology Co ltd
Current assignee: Shanghai Fengzhi New Material Technology Co ltd
Priority date: 2023-08-25
Filing date: 2023-08-25
Publication date: 2023-11-24

Abstract

The application relates to the technical field of full-biodegradable materials, in particular to a thermoplastic composite laminated material and a preparation method thereof. The thermoplastic composite laminated material comprises the following raw material components: PVA, PBAT, plasticizer, processing aid and compatibilizer; wherein, the PVA content is 10-30 parts by weight, the PBAT content is 70-90 parts by weight, the plasticizer content is 10-40 parts by weight, the processing aid content is 0.1-10 parts by weight, and the compatibilizer content is 0.5-3.0 parts by weight. The application solves the technical problem that the existing PVA is difficult to thermoplastically process. Thereby enhancing the compatibility of the PBAT and PVA. The thermoplastic composite laminated material has high strength and good openness, and can be used for different foods and industrial packaging materials.

Description

Thermoplastic composite laminated material and preparation method thereof

Technical Field

The application relates to the technical field of full-biodegradable materials, in particular to a thermoplastic composite laminated material and a preparation method thereof.

Background

The polyvinyl alcohol (PVA) material is a fully biodegradable environment-friendly material, can be widely used as chemical packaging films of pesticides, dyes, cleaning agents, detergents and the like and textile packaging films, and can also be used as a biodegradable PVA raw material for anti-infection water-soluble medical disposal bags, embroidery, demolding, injection molding and blow molding.

However, since PVA is a crystalline polymer, a large number of hydroxyl groups are contained in the molecule, and a large number of molecular and intermolecular hydrogen bonds can be formed, so that the melting point is as high as 220-240 ℃, and the decomposition temperature of PVA begins to dehydrate at 160 ℃ and decomposes at 200 ℃, so that the decomposition temperature of PVA is close to the melting point temperature, and therefore, the PVA is difficult to thermoplastic process. At present, the melt-processible modified PVA resins are obtained by reducing the forces between PVA molecules and lowering the melting point to make the PVA thermoplastically processible, mostly by copolymerization or plasticization. The copolymerization modification process is complex, and the industrial production difficulty is high. The process of modifying PVA after adding plasticizer is simple. However, the existing PVA preparation method cannot meet the actual needs in order to ensure that the PVA melt-processed product has no adhesion, openness, water resistance and weather resistance.

Disclosure of Invention

The application provides a thermoplastic composite film coating material and a preparation method thereof, which are used for solving the technical problem that the existing PVA is difficult to thermoplastic process.

In a first aspect, the application provides a thermoplastic composite film coating material, which comprises the following raw material components in parts by weight:

PVA, PBAT, plasticizer, processing aid and compatibilizer; wherein, the weight portions of the components are calculated,

10-30 parts of PVA, 70-90 parts of PBAT, 10-40 parts of plasticizer, 0.1-10 parts of processing aid and 0.5-3.0 parts of compatibilizer.

Optionally, in the raw material components of the thermoplastic composite film coating material, the PVA content is 10-30 parts by weight, the PBAT content is 70-90 parts by weight, and the processing aid content is 0.1-10 parts by weight.

Alternatively, the PVA has a degree of polymerization of 1000 to 2400 and an alcoholysis degree of 72 to 99.9mol%.

Optionally, the plasticizer includes at least one of: tri-n-butyl citrate, ethylene glycol, glycerol, diethylene glycol, xylitol, glycerol esters, sorbitol, polyether polyols, ethylene acrylic acid copolymers and polyethylene glycols.

Optionally, the plasticizer is a mixture of tri-n-butyl citrate and glycerol; wherein the ratio of the tri-n-butyl citrate to the glycerol is 2-5:1-2.

Optionally, the ratio of the tri-n-butyl citrate to the glycerol is 3:1.

optionally, the processing aid includes at least one of: calcium stearate, zinc stearate, aluminum hydroxide, silicon dioxide, stearamide, mica, erucamide, polyethylene wax, oxidized polyethylene wax, stearic acid, and oxidized paraffin wax.

Optionally, the processing aid is a mixture of polyethylene wax and stearic acid; wherein the ratio of the polyethylene wax to the stearic acid is 2-4:1-2.

Optionally, the compatibilizer includes at least one of: acrylic acid, methacrylic acid and methacrylic acid chromium chloride.

In a second aspect, the present application provides a method for preparing a thermoplastic composite film coating material, which is used for preparing the thermoplastic composite film coating material according to any one of the embodiments of the first aspect, and the method includes:

firstly mixing PVA, a plasticizer, a processing aid and a compatibilizer, heating, and cooling to obtain a first material;

extruding the first material for the first time, and then carrying out first cooling and granulating after the first cooling to obtain PVA master batch;

and (3) carrying out second mixing on the PVA master batch and the PBAT, carrying out second extrusion, carrying out second cooling and second cooling, and then granulating to obtain the thermoplastic composite coating material.

Optionally, the heating temperature is 50-110 ℃, the first extrusion temperature is 110-180 ℃, and the second extrusion temperature is 120-180 ℃.

Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:

the thermoplastic composite coating material provided by the embodiment of the application takes PBAT and PVA as main raw materials and is matched with other auxiliary agents, and the requirements of coating fluidity and viscosity are met by optimizing the performances of the two materials, so that the thermoplastic processing of PVA is realized, and the compatibility of the PBAT and PVA is enhanced. The thermoplastic composite laminated material has high strength and good openness, and can be used for different foods and industrial packaging materials.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a schematic flow chart of a preparation method of a thermoplastic composite laminated material according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Various embodiments of the application may exist in a range of forms; it should be understood that the description in a range format is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the application; it is therefore to be understood that the range description has specifically disclosed all possible sub-ranges and individual values within that range. For example, it should be considered that a description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, wherever applicable. In addition, whenever a numerical range is referred to herein, it is meant to include any reference number (fractional or integer) within the indicated range.

In the present application, unless otherwise specified, terms such as "upper" and "lower" are used specifically to refer to the orientation of the drawing in the figures. In addition, in the description of the present specification, the terms "include", "comprising" and the like mean "including but not limited to". Relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describing an association relationship of an association object means that there may be three relationships, for example, a and/or B, may mean: a alone, a and B together, and B alone. Wherein A, B may be singular or plural. Herein, "at least one" means one or more, and "a plurality" means two or more. "at least one", "at least one" or the like refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one (individual) of a, b, or c," or "at least one (individual) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple, respectively.

Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or may be prepared by existing methods.

PVA (polyvinyl alcohol), PBAT (poly (adipic acid)/butylene terephthalate), plasticizers, processing aids, and compatibilizers; wherein, the weight portions of the components are calculated,

In some embodiments, the thermoplastic composite coating material comprises, by weight, 10-30 parts of PVA, 70-90 parts of PBAT, and 0.1-10 parts of processing aid.

PVA function: the viscosity of the composite material is enhanced, and the fluidity of the material is regulated. The positive effect of controlling the PVA content to be 10-30 parts is that: in the numerical range, the fluidity and the cohesiveness of the laminating material are best. If the PVA content is too high, the moisture resistance of the composite material is reduced to a certain extent; if the PVA content is too low, the viscosity-increasing and fluidity-adjusting effects are not exhibited to some extent. Specifically, the content of the PVA may be 5 parts, 10 parts, 20 parts, 30 parts, or the like. Preferably, the content of the PVA may be controlled to 10 to 30 parts.

Action of PBAT: PBAT is well known as a fully degradable material with excellent processability. If the content of the PBAT is too high, the cohesiveness and the fluidity can not meet the production requirement of the laminated film to a certain extent; if the content of the PBAT is too low, the moisture resistance cannot be ensured to some extent. Specifically, the PBAT content may be 70 parts, 80 parts, 90 parts, 95 parts, etc. Preferably, the content of the PBAT can be controlled to 70-90 parts.

The plasticizer acts as: the thermoplastic processability of PVA can be improved. The positive effect of controlling the content of the plasticizer to be 10-40 parts is that: the plasticizing effect is best. If the content of the plasticizer is too high, the cohesiveness and strength of the material can be reduced to a certain extent; if the plasticizer content is too low, the PVA material may not be thermoplastically processed to some extent. Specifically, the content of the plasticizer may be 10 parts, 20 parts, 30 parts, 40 parts, or the like.

The function of the processing aid is as follows: mainly to increase the heat resistance and fluidity of the material. The positive effect of controlling the content of the processing aid to be 0.1-10 parts is that: the best effect is achieved. If the content of the processing aid is too high, the material cohesiveness is reduced to a certain extent; if the content of the processing aid is too low, the effect of heat stabilization and fluidity increase will not be exerted to some extent. Specifically, the content of the processing aid may be 0.1 part, 1 part, 2 parts, 4 parts, 6 parts, 8 parts, 10 parts, or the like. Preferably, the content of the processing aid may be controlled to 0.1 to 10 parts.

Compatibilizer function: is a substance with good compatibility with PVA and PBAT. The positive effect of controlling the content of the compatibilizer to be 0.5-3.0 parts is that: so that the two materials are fully dissolved. If the content of the compatibilizer is too high, the viscosity of the material can be reduced to a certain extent; if the content of the compatibilizer is too low, the compatibilizer can not play a role in fusing the two materials together to a certain extent. Specifically, the content of the compatibilizer may be 0.5 part, 1 part, 2 parts, 3.0 parts, or the like.

In some embodiments, the PVA has a degree of polymerization of 1000 to 2400 and an alcoholysis degree of 72 to 99.9mol%.

The polymerization degree of PVA is too high, so that thermoplastic processing cannot be performed to a certain extent; the polymerization degree is too low, so that the melt strength can not meet the use requirement of the laminated film to a certain extent. Thus further controlling the polymerization degree of PVA to 1000-2400. Specifically, the degree of polymerization of the PVA may be 1000, 1500, 2000, 2400, or the like.

The alcoholysis degree of PVA is too high and thermoplastic processing may not be possible to some extent. If the alcoholysis degree is too low, the melt strength can not meet the use requirement of the laminated film to a certain extent. Thus, the polymerization degree of PVA is further controlled to be 72 to 99.9mol%. Specifically, the alcoholysis degree of the PVA may be 72mol/%, 80mol/%, 90mol/%, 99 9mol/%, or the like.

In some embodiments, the plasticizer comprises at least one of the following: tri-n-butyl citrate, ethylene glycol, glycerol, diethylene glycol, xylitol, glycerol esters, sorbitol, polyether polyols, ethylene acrylic acid copolymers and polyethylene glycols.

The positive effects of selecting tri-n-butyl citrate, ethylene glycol, glycerol, diethylene glycol, xylitol, glyceride, sorbitol, polyether polyol, ethylene acrylic acid copolymer and polyethylene glycol as the plasticizer are that: the plasticizer has good compatibility with PVA, and can play a good plasticizing effect on PVA.

In some embodiments, the plasticizer is a mixture of tri-n-butyl citrate and glycerol; wherein the ratio of the tri-n-butyl citrate to the glycerol is 2-5:1-2.

In some embodiments, the tri-n-butyl citrate to glycerol ratio is 3:1.

the positive effect of selecting the mixture of the tri-n-butyl citrate and the glycerol as the plasticizer is that: the plasticizing effect on PVA is best. Controlling the ratio of tri-n-butyl citrate to the glycerol to be 2-5: 1-2: PVA materials meeting the requirements of film coating can be produced through the proportion. Specifically, the ratio may be 2: 1. 3: 2. 3:1. 5:2, etc. Preferably, the ratio may be 3:1.

in some embodiments, the processing aid comprises at least one of: calcium stearate, zinc stearate, aluminum hydroxide, silicon dioxide, stearamide, mica, erucamide, polyethylene wax, oxidized polyethylene wax, stearic acid, and oxidized paraffin wax.

The active effects of the processing aid are that calcium stearate, zinc stearate, aluminum hydroxide, silicon dioxide, stearamide, mica, erucamide, polyethylene wax, oxidized polyethylene wax, stearic acid and oxidized paraffin wax are selected as the processing aid: meets the requirements of stability and fluidity of materials, and other requirements of use are not met. Preferably, the processing aid may be calcium stearate and erucamide.

In some embodiments, the processing aid is a mixture of polyethylene wax and stearic acid; wherein the ratio of the polyethylene wax to the stearic acid is 2-4:1-2.

The processing aid is a mixture of polyethylene wax and stearic acid, and has the positive effects that: the fluidity of the material is increased. Controlling the proportion of the polyethylene wax to the stearic acid to be 2-4: 1-2: the fluidity and processability are the best. Specifically, the ratio may be 2: 1. 3: 2. 4:1, etc.

In some embodiments, the compatibilizer comprises at least one of: acrylic acid, methacrylic acid and methacrylic acid chromium chloride.

The positive effects of the selected acrylic acid, methacrylic acid and methacrylic acid chromium chloride as the compatibilizer are that: improving the compatibility of PVA and PBAT. Preferably, the compatibilizer may be acrylic acid.

In a second aspect, the present application provides a method for preparing a thermoplastic composite laminated material, referring to fig. 1, for preparing a thermoplastic composite laminated material according to any one of the embodiments of the first aspect, the method includes:

s1, mixing PVA, a plasticizer, a processing aid and a compatibilizer for the first time, heating, and cooling to obtain a first material;

s2, performing first extrusion on the first material, performing first cooling and first cooling, and granulating to obtain PVA master batch;

s3, carrying out second mixing on the PVA master batch and the PBAT, carrying out second extrusion, carrying out second cooling and second cooling, and then granulating to obtain the thermoplastic composite laminated material.

The embodiment of the application discloses a production method for producing a laminated film and a cast film by compounding PVA and PBAT which can be formed in a thermoplastic mode. And (3) producing the film coating material for application on the film coating machine equipment through blending and co-extrusion of PBAT and PVA, and modifying and fusing. And producing the food and industrial product packaging materials with different purposes through a laminating machine. The PE and PP material is used for replacing the original food and industrial product packaging materials which take PE and PP as main materials. Thereby playing an important role in reducing white pollution.

Specifically, in the step S1, PVA, a plasticizer, a processing aid and a compatibilizer are added into a mixer in any sequence, uniformly mixed in a stirring state, heated to 50-110 ℃, cooled to 30-45 ℃ for 3-5 minutes at constant temperature, and kept for 4-8 hours.

And (2) adding the uniformly mixed materials in the step (S1) into a double-screw extruder through screws, performing melt extrusion at the temperature of 110-180 ℃ under normal pressure or pressurization, cooling to 20-40 ℃, and granulating by a granulator to obtain PVA modified master batch.

Uniformly mixing the Polydiene (PVA) master batch of S2 with PBAT at 30-90 ℃, carrying out melt extrusion at 120-180 ℃ by a screw extruder, cooling to 20-40 ℃, and granulating by a granulator to obtain PVA and PBAT compound (fully biodegradable resin)

In the embodiment of the application, the thermoplastic full-biodegradable composite material (resin) can be coated with a film, and the resin can be formed into a film by means of different machine equipment and is applied to packaging with different uses from industry and agriculture.

As another preparation method: adding PVA, plasticizer and processing aid into a mixer in any sequence, uniformly mixing in a stirring state, heating to 30-100 ℃ and keeping for 4-8 hours,

and (3) putting the uniformly mixed materials into a double-screw extruder, performing melt extrusion at the screw extrusion temperature of 120-180 ℃ under normal pressure or pressurization, cooling to 20-40 ℃, and granulating by a granulator to obtain the PVA master batch. I.e. a fully biodegradable PVA masterbatch.

Adding compatibilizer into the master batch at 30-100 ℃, uniformly mixing the master batch with PBAT, carrying out melt extrusion at 120-180 ℃ by a double screw extruder, cooling to 20-40 ℃, and granulating by a granulator to obtain PVA and PBAT composite laminated material, namely the full-biodegradable PVA+PBAT laminated resin.

In addition, in the other preparation mode, the PBAT and other materials can be mixed and heated together, and finally the PVA+PBAT full-biodegradable resin coating can be prepared.

The preparation method of the thermoplastic composite coating material is realized based on the raw material components of the thermoplastic composite coating material, and the raw material components of the thermoplastic composite coating material can refer to the above embodiments.

The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.

Example 1

30 parts of PVA (polymerization degree 1000, alcoholysis degree 75 mol%)

30 parts of plasticizer (tri-n-butyl citrate: glycerol=3:1)

0.5 part of calcium stearate

0.4 part of erucamide

0.8 part of acrylic acid

Adding the materials into a mixer in any sequence, uniformly mixing the materials in a stirring state, heating the materials to 80 ℃, keeping the temperature for 5 minutes, cooling the materials to 40 ℃, discharging the materials, keeping the materials for 1 hour, adding the mixed materials into a double-screw extruder, extruding the materials at 140 ℃, cooling the materials at 40 ℃, and granulating the materials to obtain the PVA master batch. And uniformly mixing the PVA master batch with 88 parts of PBAT, extruding and granulating to obtain the PBAT and PVA compound (full-biodegradable resin).

Results: the prepared thermoplastic PVA and PBAT composite has the melting temperature of 180 ℃, the decomposition temperature of 270 ℃, and the melt index of 12g/10min (190 ℃/2.16-10 Kg), and the laminated product has high bonding strength and good opening property.

Example 2

30 parts of PVA (polymerization degree 1700, alcoholysis degree 75 mol%)

10-40 parts of plasticizer (tri-n-butyl citrate: diethylene glycol=1:1.5)

0.6 part of calcium stearate

Erucamide 0.6 parts

Acrylic acid 1.0 part

Adding into a mixer in any sequence, uniformly mixing under stirring, heating to 80 ℃ and keeping for 8 hours. And extruding and granulating to prepare PVA master batches, then carrying out melt extrusion on the PVA master batches and 85 parts of PBAT at normal temperature through a double-screw extruder at the temperature of 125 ℃, cooling to room temperature, and granulating through a granulator to prepare the PVA and PBAT composite (resin).

Results: the melting temperature of the prepared PVA and PBAT compound is 180 ℃, the decomposition temperature is 280 ℃, and the melt index is 10g/10min (190 ℃/2.16-10 Kg). The thermoplastic PVA produced laminated product has good opening property and strength up to 60Mpa.

Example 3

30 parts of PVA (polymerization degree 1800, alcoholysis degree 80 mol%)

20 parts of tri-n-butyl citrate

0.8 part of aluminum hydroxide

0.8 part of stearic acid

1.5 parts of acrylic acid

Adding the materials into a mixer in any sequence, heating to 85 ℃ under stirring, extruding by a double-screw extruder, cooling and granulating to prepare PVA master batch, blending with 80 parts of PBAT at normal temperature, melting and extruding by the screw extruder at 135 ℃, cooling to 35 ℃, granulating to prepare PVA and PBAT composite material. Namely, the full-biodegradable PVA+PBAT resin (coating material).

Results: the prepared resin has the melting temperature of 180 ℃, the decomposition temperature of 280 ℃ and the melt index of 40g/10min (190 ℃/2.16), and the PVA and PBAT composite has high strength in preparing section bars or films, high bonding strength with paper and high film strength up to 80Mpa.

Example 4

30 parts of PVA (polymerization degree 2000, alcoholysis degree 80 mol%)

20 parts of plasticizer (tri-n-butyl citrate: ethylene glycol=3:2)

0.5 part of oxidized paraffin wax

1.5 parts of acrylic acid

Adding into a mixer in any sequence, uniformly mixing under the stirring state, heating to 90 ℃, keeping the temperature for 4 minutes, cooling to 40 ℃, and keeping for 4 hours. And then the mixed materials are melted and extruded at 140 ℃ through a double-screw machine, cooled to 40 ℃, and pelletized through a pelletizer to prepare the PVA master batch. And uniformly mixing the PVA master batch with 70 parts of PBAT, carrying out melt extrusion at 145 ℃ through a double-screw extruder, cooling to 40 ℃, and granulating to obtain the thermoplastic PVA+PBAT full-biodegradable composite resin (laminating material).

Results: the PVA composite material has the melting temperature of 190 ℃, the decomposition temperature of 280 ℃, the melt index of 40/10min (190 ℃/2.16 KG), and the thermoplastic PVA and PBAT composite material (resin) have high bonding strength, good heat sealing and opening property, and the film strength can reach 80Mpa.

Example 5

30 parts of PVA (polymerization degree 2200, alcoholysis degree 88 mol%)

18 parts of plasticizer (tributyl citrate)

0.6 part of erucamide

0.8 part of calcium stearate

0.4 part of oxidized paraffin wax

Adding the materials into a mixer in any sequence, uniformly mixing the materials in a stirring state, heating the materials to 90 ℃, keeping the temperature for 5 hours, adding the uniformly stirred materials into a double-screw extruder, carrying out melt extrusion at the temperature of 150 ℃, cooling the materials to 30 ℃, and granulating the materials by a granulator to obtain PVA (V) -type master batch. Uniformly mixing PVA (V) master batch, 0.6 part of Rong Jibing diluted acid and 90 parts of PBAT, then carrying out melt extrusion at 150 ℃ by a double-screw extruder, cooling to 30 ℃, and granulating to obtain the full-biodegradable (V) resin of PVA and PBAT.

Results: the melting temperature of the full-biodegradable (V) resin of PVA and PBAT is 180 ℃, the decomposition temperature is 280 ℃, the melt index is 40g/10min (190 ℃/2.16-10 Kg), and the material is used for laminating, and has high bonding strength, good opening property and good heat sealing property.

PVA is crystalline polymer, which contains a large number of hydroxyl groups in the molecule, and can form a large number of molecular and intermolecular hydrogen bonds, so that the melting point is up to 220-240 ℃, and the decomposition temperature of PVA begins to dehydrate at 160 ℃ and decomposes at 200 ℃, so that the PVA is difficult to thermoplastic process because the decomposition temperature of PVA is close to the melting point temperature. At present, the melt-processible modified PVA resins are obtained by reducing the forces between PVA molecules and lowering the melting point to make the PVA thermoplastically processible, mostly by copolymerization or plasticization. The copolymerization modification process is complex, and the industrial production difficulty is high.

Therefore, the thermoplastic composite laminated material provided by the embodiment of the application takes PBAT and PVA as main raw materials and is matched with other auxiliary agents, and the requirements of the fluidity and viscosity of the laminated film are met by optimizing the performances of the two materials, so that the thermoplastic processing of the PVA is realized, and the compatibility of the PBAT and the PVA is enhanced. The thermoplastic composite laminated material has high strength and good openness, and can be used for different foods and industrial packaging materials.

The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The thermoplastic composite coating material is characterized by comprising the following raw material components in percentage by weight:

2. The thermoplastic composite laminated material according to claim 1, wherein the content of PVA is 10-30 parts by weight, the content of PBAT is 70-90 parts by weight, and the content of the processing aid is 0.1-10 parts by weight.

3. Thermoplastic composite film coating material according to claim 1 or 2, characterized in that the degree of polymerization of the PVA is 1000-2400 and/or the degree of alcoholysis of the PVA is 72-99.9 mol-%.

4. The thermoplastic composite coated material of claim 1, wherein the plasticizer comprises at least one of:

tri-n-butyl citrate, ethylene glycol, glycerol, diethylene glycol, xylitol, glycerol esters, sorbitol, polyether polyols, ethylene acrylic acid copolymers and polyethylene glycols.

5. The thermoplastic composite film coating material according to claim 4, wherein the plasticizer is a mixture of tri-n-butyl citrate and glycerol; wherein,

the ratio of the tri-n-butyl citrate to the glycerol is 2-5:1-2.

6. The thermoplastic composite film coating material according to claim 5, wherein the ratio of tri-n-butyl citrate to glycerol is 3:1.

7. the thermoplastic composite coated material of claim 1, wherein the processing aid comprises at least one of:

calcium stearate, zinc stearate, aluminum hydroxide, silicon dioxide, stearamide, mica, erucamide, polyethylene wax, oxidized polyethylene wax, stearic acid, and oxidized paraffin wax.

8. The thermoplastic composite film coating material of claim 6, wherein the processing aid is a mixture of polyethylene wax and stearic acid; wherein,

the ratio of the polyethylene wax to the stearic acid is 2-4:1-2.

9. The thermoplastic composite coated material of claim 1, wherein the compatibilizer comprises at least one of:

acrylic acid, methacrylic acid and methacrylic acid chromium chloride.

10. A method for preparing a thermoplastic composite coated material, characterized in that the method is used for preparing the thermoplastic composite coated material according to any one of claims 1 to 9, and comprises the following steps: