WO2019047700A1

WO2019047700A1 - Preparation methods for environment-friendly plastic masterbatch material, environment-friendly film and environment-friendly tape

Info

Publication number: WO2019047700A1
Application number: PCT/CN2018/100786
Authority: WO
Inventors: 蔡剑勇
Original assignee: 浙江山联新材料科技有限公司
Priority date: 2017-09-05
Filing date: 2018-08-16
Publication date: 2019-03-14
Also published as: WO2019047699A1

Abstract

An object of the present invention is to provide a preparation method for a plastic material which has good plasticity and degradability and can be easily prepared into products in different shapes. The method comprises the following steps: step A: weighing and adding in sequence 56-85% by weight of inorganic mineral powder, 3-10% by mass of polyethylene, 18-30% by mass of polypropylene and 3-5% of aids into a mixer, and mixing for 20-25 min to obtain a raw material mixture, the mixer being at a rotating speed of 100-135r/min; step B: melt-mixing the raw material mixture in the mixer by using an extruder at 180-250 ℃ so that the raw material mixture is molten and extruded, and then pelletizing the extruded raw material mixture at high speed through a knife edge, the prepared pellet material being an environment-friendly plastic masterbatch material. The present invention further provides a method for preparing an environment-friendly film by using the environment-friendly plastic masterbatch material obtained by means of the plastic material preparation method, and a method for preparing an environment-friendly tape by using the obtained environment-friendly film.

Description

Preparation method of environmentally friendly plastic masterbatch material, environmental protection film and environmental protection tape

Technical field

The invention belongs to the field of materials, and relates to a method for preparing an environmentally-friendly plastic masterbatch material, a method for preparing an environmentally friendly film by using the environmentally-friendly plastic masterbatch material, and a method for preparing an environmentally-friendly adhesive tape by using an environmentally friendly film.

Background technique

Plastic products are used in all aspects of daily life and industrial production. Packaging materials (such as plastic sealing film, plastic boxes, plastic bags and tapes mainly made of plastic) are used in large quantities, various types and often mixed with other garbage, so recycling difficult. If such plastic products are buried or incinerated, the soil will be destroyed or air pollution will be generated, which is extremely unfavorable to environmental protection.

On the other hand, the main components of plastic products are various polymer compounds, the source of which is mainly petroleum, and the total amount of petroleum resources is limited and non-renewable. Therefore, the plastic products industry is also facing the problem of resource reduction and rising costs.

In order to reduce the residue of plastic products, some degradable materials used in place of plastics have appeared in the prior art, such as biodegradable materials made of plant fibers or the like. However, such materials have poorer properties such as plasticity and strength than conventional plastics, and it is difficult to manufacture articles of different shapes, and the application range is small. In addition, the cost of such biodegradable materials is higher than existing plastic products, further limiting their use.

Another type of environmentally friendly plastic product has emerged in the prior art, such as the production of films, sheets or other shaped products by mixing inorganic mineral powder with polymeric materials and other materials. Because of the inorganic mineral powder, the cost of such products is low. At the same time, the inorganic mineral powder can also use ground construction waste as a raw material, so that it can be used for waste and is environmentally friendly. However, such articles still suffer from the disadvantage of being difficult to degrade. Moreover, the inorganic ore powder still exists in the form of particles after being made into the masterbatch raw material, so that the phenomenon of powder removal and the like are likely to occur during the preparation of the product, resulting in difficulty in molding or defects in the appearance and strength of the product, especially in the case of In terms of packaging materials with high requirements on appearance and strength, the above environmentally friendly materials cannot be applied.

Summary of the invention

In order to solve the above problems, a method for preparing a plastic material which is good in plasticity, easy to prepare into a product of different shapes and has degradability, and a method for preparing an environmentally friendly film and an environmentally-friendly tape for packaging using the plastic material are provided, and the present invention adopts The following technical solutions:

The invention provides a preparation method of environmentally-friendly plastic masterbatch material, which comprises the following steps: Step A: weigh and sequentially combine 56%-85% by weight of inorganic ore fines and 3%-10% of mass of poly Ethylene, 18% to 30% by mass of polypropylene and 3% to 5% of auxiliary agent are added to the mixer, mixed for 20 to 25 minutes to obtain a raw material mixture, the speed of the mixer is 100 to 130 r/min; Step B: mixing The raw material mixture in the machine is melt-kneaded in an extruder at a temperature of 180 ° C to 250 ° C, so that the raw material mixture is melted and extruded, and then subjected to high-speed pelletizing through a knife edge, and the obtained granular material is environmentally friendly plasticity. Masterbatch material.

The preparation method of the environmentally-friendly plastic masterbatch material provided by the invention may also have such technical characteristics, wherein the auxiliary agent is surface modifier PN-827, heat stabilizer BASF225, lubricant zinc stearate L-806, lubrication A mixture of one or more of a PP wax and a surface modifier stearic acid 1801.

The preparation method of the environmentally-friendly plastic masterbatch material provided by the invention may further have the technical feature, wherein the inorganic ore powder is calcined or uncalcined calcium carbonate, calcium sulfate, copper sulfate, bentonite, silver stone powder, clay, talcum powder , chalk powder, zinc oxide, hollow glass microbeads, sand powder, waste coal slag powder, waste coal gangue powder, waste building stone powder, collecting one or more mixtures of PM2.5 dust.

The method for preparing an environmentally-friendly plastic masterbatch material provided by the present invention may further have such a technical feature, wherein the inorganic ore fine powder has an average particle diameter of 800 mesh to 1200 mesh.

The method for preparing an environmentally-friendly plastic masterbatch material provided by the present invention may further have such a technical feature, wherein the polyethylene is a mixture of one or more of high-density polyethylene, medium-density polyethylene, and low-density polyethylene.

The method for preparing an environmentally-friendly plastic masterbatch material provided by the present invention may further have such technical features, wherein the polypropylene is a homopolypropylene.

The invention also provides a method for preparing an environmentally-friendly film, which is characterized in that the environmentally-friendly plastic masterbatch material obtained by any of the above methods is used to prepare an environmentally-friendly film, and the preparation method of the environmentally-friendly film comprises the following steps: Step C, using casting The device casts the film of the environmentally-friendly plastic masterbatch material, and the casting film comprises the following process: Step C1, melting the environmentally-friendly plastic masterbatch material, extruding through the vacuum pump of the casting device, and passing through the front end of the die of the casting device The gap flows out, so that the environmentally-friendly plastic masterbatch material forms a melt film; in step C2, the melt film is allowed to leave the die and reach a low-temperature casting roll surface of the casting device by a predetermined distance to be cooled and shaped, and stretched by a casting device. The roller is longitudinally and transversely stretched to form a bidirectional film which is an environmentally friendly film.

The method for preparing an environmentally-friendly film provided by the present invention may further have such a technical feature, wherein the number of slits at the front end of the die is three, five or seven.

The method for preparing an environmentally-friendly film provided by the present invention may further have such a technical feature, wherein the slit width at the front end of the die is 2500 mm, 3000 mm, 3500 mm or 5000 mm.

The invention also provides a preparation method of the environmental protection tape, which is characterized in that the environmental protection film obtained by the above method is used to prepare an environmental protection tape, and the preparation method of the environmental protection tape comprises the following steps: Step D: adhesive coating, coating the adhesive Forming an adhesive layer on the first working surface of the substrate formed by the film; Step E: drying, and the substrate processed in the step D is placed in an oven for drying, and the formed tape is an environmentally friendly tape.

The method for preparing an environmentally friendly film provided by the present invention may further have such a technical feature, wherein the adhesive is an aqueous glue.

Invention effect and effect

In the present invention, since 56% to 85% by weight of inorganic ore fines, 3% to 10% by mass of polyethylene, and 18% to 30% by mass of polypropylene are used as main raw materials for preparing an environmentally-friendly plastic masterbatch material, it is possible to further The obtained environmentally-friendly film, environmentally friendly tape and the like have good degradability; at the same time, since the addition of polypropylene, the molding property can be increased, and the obtained masterbatch material can be formed into a film or the like by a multilayer casting method. In addition, the polyethylene can increase the strength, so that the environmentally-friendly film, environmental protection tape and the like prepared by the method of the invention have better strength and have better application value in the fields of packaging materials and the like.

DRAWINGS

Fig. 1 is a schematic view showing the structure of an environmentally friendly film of the present invention.

Detailed ways

The invention provides a preparation method of an environmentally-friendly plastic masterbatch material, an environmental protection film and an environmental protection tape, wherein the environmental protection film is prepared by using an environmentally-friendly plastic masterbatch material, and the environmental protection tape is prepared by using an environmentally friendly film.

The preparation method of the environmentally-friendly plasticity masterbatch material comprises the following steps: Step A: weigh and sequentially combine 56% to 85% by weight of inorganic ore fines, 3% to 10% by mass of polyethylene, and 18% to 30% by mass of poly Propylene and 3% to 5% of additives are added to the mixer, mixed for 20 to 25 minutes to obtain a raw material mixture, the speed of the mixer is 100-130r/min; Step B: the raw material mixture in the mixer is in the extruder The melt-kneading is carried out at a temperature of 180 ° C to 250 ° C, so that the raw material mixture is melted and extruded, and then subjected to high-speed pelletizing through a knife edge, and the obtained granular material is an environmentally-friendly plastic masterbatch material.

The preparation method of the environmental protection film comprises the following steps: Step C, casting the film of the environmentally-friendly plastic masterbatch material by using a casting device, and casting the film comprises the following process: Step C1, melting the environmentally-friendly plastic masterbatch material, and casting After the vacuum pump of the device is extruded, it flows out through the gap at the front end of the die of the casting device, so that the environmentally-friendly plastic masterbatch material forms a melt film; in step C2, the molten film leaves the die and reaches a predetermined temperature to reach the low-temperature flow of the casting device. The roller surface is cooled and set, and the stretching roller is used for longitudinal and transverse stretching, and the formed bidirectional film is an environmentally friendly film.

The preparation method of the preparation method of the environmental protection tape comprises the following steps: Step D: adhesive coating, coating the adhesive on the first working surface of the substrate formed by the film to form an adhesive layer; Step E: drying, in step D The treated substrate enters the oven for drying, and the formed tape is an environmentally friendly tape.

In the above preparation methods, the environmentally-friendly plastic masterbatch material can be prepared by using Steps A to B, and then stored, and the environmentally-friendly film can be prepared by using Step C when necessary; similarly, the prepared environmentally friendly film can also be stored. When necessary, take out Steps D to E to prepare environmentally friendly tape. Alternatively, the storage process may not be provided in the middle, but the environmentally friendly film may be directly obtained by using steps A to C, or the environmentally friendly tape may be obtained by using steps A to E.

Hereinafter, the environmentally-friendly adhesive tape is prepared by taking the complete steps A to E as an example, and the specific embodiment of the present invention will be described with reference to the examples.

In the following examples:

"Powder" refers to inorganic mineral powder;

"Resin" means a mixture of polyethylene and polypropylene;

The mixing of step A is completed by a mixer, and the melt mixing of step B is completed by a continuous internal mixer;

The casting of step C is carried out by using a casting device (correspondingly, the die is a die of the casting device), and the short gap passing through the melt is the distance between the die and the low temperature casting roll surface of the casting device. The distance can be preset according to the cooling demand, and the stretching after cooling and setting is also performed by using a stretching roller of a speed in the casting device;

The substrate in step D directly adopts the film prepared in step C (ie, the eco-friendly film), and in other embodiments, may also be on the side of the eco-friendly film (ie, the second work opposite to the first working surface on which the adhesive is applied). Apply oil to prevent adhesion.

Embodiment 1

The first core of the present invention discloses a method for manufacturing a film eco-friendly tape manufactured by a casting method of inorganic mineral powder, in order to improve the environmental performance of the tape and reduce the production cost of the tape; the second core of the present invention is to disclose A method for producing a film eco-friendly tape produced by a casting method of inorganic ore powder. The embodiments are described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the invention as set forth in the claims. Further, the entire contents of the configurations shown in the following embodiments are not necessarily limited to the solutions of the invention described in the claims.

Step A: Weigh each raw material: sequentially add 56%-85% by weight of powder, 25%-35% by weight of resin, and 3%-5% of auxiliary agent to the mixer, mix for 20 to 25 minutes, mix The machine speed is 120-130r/min;

Step B: Granulation: When the screw rotates at a high speed, the mixture obtained from the step A in the feeder is pushed to the head portion, and melt-kneaded at a temperature of 180 ° C to 250 ° C in the extruder, powdery and granular materials. It is rapidly melted, and is extruded into a granular material by high-speed pelletizing through a knife edge;

Step C: After the dicing is completed, the vacuum dehydration is carried out under the action of a vacuum pump, and the casting is carried out by the strong pressure of the screw, and the raw material is melted, and then extruded through a twin-screw vacuum pump, and then flows out through the slit at the front end of the die to form a film, leaving After the die, the melt passes through a short gap to reach the low temperature casting roll surface and is rapidly cooled and shaped; the longitudinal and transverse stretching forms a bidirectional film.

Step D: adhesive coating, coating the adhesive on the first working surface of the substrate to form an adhesive layer;

Step E: drying, and the treated substrate in the step D is placed in an oven for drying to form a tape.

Wherein, the inorganic ore fine powder comprises calcium carbonate, calcium sulfate, copper sulfate, bentonite, silver stone powder, white clay, talc powder, chalk powder, zinc oxide, hollow glass microbeads, sand powder selected from calcined or uncalcined, Waste coal slag powder, waste coal gangue powder, waste building stone powder, PM2.5 dust and their mixtures.

Wherein, the auxiliary agent is added with any one of a surface modifier PN-827, a heat stabilizer BASF225, a lubricant zinc stearate L-806, a lubricant PP wax, and a surface modifier stearic acid 1801. .

Wherein, the adhesive layer is an aqueous glue layer.

Wherein, the polypropylene is a homopolypropylene.

Among them, the particle size of the powder particles is 800 to 1200 m.

Among them, polyethylene includes high density polyethylene, medium density polyethylene, low density polyethylene, and mixtures thereof.

In addition, in this embodiment, the inorganic ore fine film may be a single layer film, or may be a double layer film or even a three layer film; the single layer film, the double layer film and the three layer film may be referred to authorization. In the patent document of CN1105636C, the specific description and production process of the single-layer film, the two-layer film and the three-layer film, of course, there are four films such as four-layer film and five-layer film; In occasion, the thickness, density and number of layers of the inorganic mineral powder film can be adjusted to achieve better use.

Embodiment 2

The invention also discloses a method for manufacturing a film environmentally friendly household cleaning tape manufactured by a casting method of inorganic mineral powder, comprising the following steps:

Step A: Weigh each raw material: sequentially add 71% by weight of powder, 20% by weight of polypropylene, 5% by weight of polyethylene, and 4% of auxiliary agent to the mixer, and mix for 20 to 25 minutes, the mixer The speed is 100-130r/min;

Step B: Granulation: When the screw rotates at a high speed, the mixture obtained from the step A in the feeder is pushed to the head portion, and is melt-kneaded at a temperature of 200 ° C to 210 ° C in the extruder, and the powdery and granular materials are melted and mixed. It is rapidly melted, and is extruded into a granular material by high-speed pelletizing through a knife edge;

Wherein, the auxiliary agent is added with a heat stabilizer BASF225, a lubricant zinc stearate L-806, and a surface modifier stearic acid 1801.

The rest is the same as the first embodiment.

Embodiment 3

The invention also discloses a method for manufacturing a film environmental protection sealing tape manufactured by the casting method of inorganic mineral powder, comprising the following steps:

Step A: Weigh each raw material: 60% by weight of powder, 29% by weight of polypropylene, 6% by weight of polyethylene, and 5% of auxiliary agent are added to the mixer in sequence, and mixed for 20 to 25 minutes, the mixer The speed is 1115-130r/min;

Step B: Granulation: When the screw rotates at a high speed, the mixture obtained from the step A in the feeder is pushed to the head portion, and melted and kneaded at a temperature of 22 ° C to 230 ° C in the extruder, powdery and granular materials. It is rapidly melted, and is extruded into a granular material by high-speed pelletizing through a knife edge;

Wherein, the auxiliary agent is added with a surface modifier PN-827, a heat stabilizer BASF225, and a surface modifier stearic acid 1801.

The rest is the same as the first embodiment.

Embodiment 4

The invention also discloses a method for manufacturing a film environmental protection masking tape produced by the casting method of inorganic mineral powder, comprising the following steps:

Step A: Weigh each raw material: 63% by weight of powder, 27% by weight of polypropylene, 7% by weight of polyethylene, and 3% of auxiliary agent are added to the mixer in sequence, and mixed for 20 to 25 minutes, the mixer The speed is 100-120r/min;

Step B: granulation: when the screw rotates at a high speed, the mixture obtained from the step A in the feeder is pushed to the head portion, and melt-kneaded at a temperature of 230 ° C to 250 ° C in the extruder, powdery and granular materials. It is rapidly melted, and is extruded into a granular material by high-speed pelletizing through a knife edge;

The auxiliary agent is added with a surface modifier PN-827, a heat stabilizer BASF225, a lubricant zinc stearate L-806, and a lubricant PP wax.

The rest is the same as the first embodiment.

Comparative Example 1

Step A: Weigh each raw material: sequentially add 56%-85% by weight of powder, 25%-35% by weight of resin, and 3%-5% of auxiliary agent to the mixer, mix for 10 to 20 minutes, mix Machine speed is 120-150r/min;

Step B: granulation: the mixture obtained in the step A is fed to a screw extruder, and melt-kneaded at a temperature of 170 to 190 ° C to prepare a granular material;

Step C: The granular material is put into the press machine of the extruder and the O-shaped nozzle forming mechanism, and the temperature of the extruder is controlled to soften the granular material, and the molten material is conveyed by the screw, and the molten material is extruded to the blown film die. The blow molding die produces a film, and at the same time, the blown film die rotates, and the film is blown under the action of the wind.

The rest is the same as the first embodiment.

In summary, the difference between the first embodiment and the present technical solution is that in the case of the film of the same formulation in the case of the film of the same formulation, the tape is formed by a blown film method in the process of manufacturing the tape.

Comparative Example 2

Step A: Weigh each raw material: sequentially add 56%-85% by weight of inorganic ore fines, 25%-35% by weight of polyethylene, and 3%-5% of additives to the mixer for 20 to 25 minutes. , the speed of the mixer is 100-130r/min;

Step B: granulation: when the screw rotates at a high speed, the mixture obtained from the step A in the feeder is pushed to the head portion, melt-kneaded at a temperature of 180 ° C to 250 ° C in the extruder, and the material is rapidly melted and squeezed. After being discharged, high-speed pelletizing is performed through a knife edge to form a granular material;

Step C: After the dicing is completed, the vacuum dehydration is carried out under the action of a vacuum pump, and the casting is carried out by the strong pressure of the screw, and the raw material is melted, and then extruded through a twin-screw vacuum pump, and then flows out through the slit at the front end of the die to form a film, leaving After the die, the melt passes through a short gap to reach the low-temperature casting roll surface and is rapidly cooled and shaped, and the longitudinal and transverse stretching forms a bidirectional film.

The rest is the same as the first embodiment

In summary, the difference between the second embodiment and the technical solution is that no polypropylene is added to the formulation of the second embodiment.

Comparative Example 3

Step A: Weigh each raw material: sequentially add 56%-85% by weight of powder, 25%-35% by weight of resin, and 3%-5% of auxiliary agent to the mixer, mix for 20 to 25 minutes, mix Machine speed is 100-130r/min;

Wherein, the adhesive layer is a pressure sensitive adhesive emulsion.

The rest is the same as the first embodiment.

In summary, the difference between the third embodiment and the technical solution is that: in the case of the film of the same formulation, in the case of the film prepared by the casting method, the coating machine is coated with a pressure sensitive adhesive. The device applies the pressure sensitive adhesive to form an adhesive layer.

Example actions and effects

The inventors have conducted a number of comparative tests, and tested the performance of the films obtained in the respective examples and comparative examples (i.e., the environmentally friendly film without coating the adhesive), and the performance parameters thereof are shown in Table 1 below (the performance of Comparative Example 3) The film test results are omitted).

Table 1 performance parameters of the present invention

Note: Melt: refers to the weight or melt volume of a plastic through a standard die capillary every 10 minutes at a certain temperature and load.

The above data shows that the film melting index of the invention reaches 15 degrees -20 degrees, and the conventional film blowing method needs to melt the film to reach 30 degrees to 45 degrees, so the film is not resistant to temperature and the tensile strength is poor, and the flow is The extension method pp melts 15 degrees, so after the film formation, the temperature resistance is high, the tensile strength tensile strength reaches 25-28N, and its strength is obviously enhanced; meanwhile, the conventional blown film method has a powder removal rate of 8%, and the casting method The powder removal rate is ≤3, which makes the glue viscosity of the glue stronger. It needs to be explained that it can reach the temperature resistance of about 120 degrees, the dispersion is good, the surface is flat, and the thickness of the book is consistent. The practicality is very broad and the degradation ability is It is also very strong and environmentally friendly.

According to the comparative example 3, the inventors have conducted a plurality of comparative tests, and the comparative reference is that the process of forming the tape from the inorganic ore powder film is a comparison between the blown film method and the casting method, and the water-based glue and the pressure-sensitive adhesive emulsion are used as the glue. The adhesive layer is formed into a tape for parameter comparison, and the parameters are the drying temperature t and the thickness d of the rubber layer in the production process.

Table 2 comparison parameter table

It is worth mentioning that the inventors have found that the above data indicates that the combination of the film environmentally friendly tape and the water-based adhesive produced by the casting method of the inorganic ore fine film produces unexpected technical effects, and the drying temperature and the glue. The layer thickness, under the premise of ensuring that the quality of the tape is not affected, achieves a lower drying temperature and a thickness of the rubber layer, which the inventors believe may be related to the properties of the inorganic mineral powder film, and the surface thereof The fine pores can be better bonded to the adhesive layer, and the natural mineral powder contained therein has better gas permeability and contributes to the drying process; and the water-based adhesive layer itself has a low drying temperature and The good gel property and the inorganic mineral powder film play a mutually reinforcing role and achieve a good use effect.

The inventors also conducted structural analysis on the environmentally friendly film prepared in the examples. As shown in FIG. 1 , the environmentally-friendly film prepared by the method of the invention exhibits an embedded structure, that is, the inorganic ore powder is formed in the film layer in an embedded form, so that the inorganic mineral powder is firmly combined and is not easy to remove powder, and also Let the appearance of the film appear smooth.

Further, the inventors also investigated the degradability of the environmentally-friendly films prepared by the different examples and comparative examples, the main process of which is to place the sample (ie, the film without the adhesive) under ultraviolet light having the same ultraviolet intensity as natural light for a period of time. To investigate its photodegradability. Among them, the time required for the sample to degrade into a form which does not have a complete sheet shape (that is, a form in which fine fragments or powders are formed) is the degradation time.

Table 3 Degradation performance of the environmentally friendly film of the present invention

Compared with other examples, the amount of inorganic mineral powder added in the second embodiment is relatively large, and the degradation time is short, indicating that the inorganic ore powder has the effect of enhancing the degradation performance.

Compared with the other examples, the polyethylene of Example 4 was more added, and the tensile strength was higher than that of the other examples. It can be seen that polyethylene has an effect of increasing the strength of the film.

Compared with the respective examples, Comparative Example 2 did not add polypropylene, and the powder removal rate was high. At the same time, the inventors have also found that the surface of the film of Comparative Example 2 is rougher than that of the respective examples, and has a rough and uneven structure inside when viewed by light, indicating that the polypropylene has an effect of enhancing molding properties and reducing powder removal.

Compared with the respective examples, the first embodiment uses the blown film method to form a film, and the powder removal rate is high, indicating that the film preparation by the casting method and the casting device can better suppress the powder removal phenomenon and improve the film formation. effect.

The above has described in detail the preferred embodiments of the invention. It will be appreciated that many modifications and variations can be made in accordance with the teachings of the present invention without departing from the scope of the invention. Therefore, any technical solution that can be obtained by a person skilled in the art based on the prior art based on the prior art by logic analysis, reasoning or limited experimentation should be within the scope of protection determined by the claims.

For example, in each of the above embodiments, the plastic environmentally friendly masterbatch material is used to prepare an environmentally friendly film, and the environmentally friendly film is used for preparing an environmentally friendly tape. However, in the present invention, the plastic environmentally friendly masterbatch material can also be used for preparing other products (including replacing existing plastics to prepare products having degradation requirements), and the environmentally friendly film can also be used for preparing other thin products (including replacing existing plastic packaging materials). Preparation of packaging materials).

Claims

A method for preparing an environmentally-friendly plastic masterbatch material, comprising the steps of:

Step A: weigh and sequentially add 56% to 85% by weight of inorganic ore fines, 3% to 10% by mass of polyethylene, 18% to 30% by mass of polypropylene, and 3% to 5% of additives to the mixer. Medium, mixing for 20 to 25 minutes to obtain a raw material mixture, the speed of the mixer is 100 ~ 130r / min;

Step B: The raw material mixture in the mixer is melt-kneaded in an extruder at a temperature of 180 ° C to 250 ° C, so that the raw material mixture is melted and extruded, and then cut through a knife edge at a high speed. The granules are made of the environmentally-friendly plastic masterbatch material.
The method for preparing an environmentally-friendly plastic masterbatch material according to claim 1, wherein:

Wherein, the auxiliary agent is one or more of a surface modifier PN-827, a heat stabilizer BASF225, a lubricant zinc stearate L-806, a lubricant PP wax, and a surface modifier stearic acid 1801. mixture.
The method for preparing an environmentally-friendly plastic masterbatch material according to claim 1, wherein:

Wherein, the inorganic ore powder is calcined or uncalcined calcium carbonate, calcium sulfate, copper sulfate, bentonite, silver stone powder, clay, talcum powder, chalk powder, zinc oxide, hollow glass microbeads, sand powder, waste coal slag powder , waste coal gangue powder, waste building stone powder, collecting one or more mixtures of PM2.5 dust.
The method for preparing an environmentally-friendly plastic masterbatch material according to claim 3, wherein:

The inorganic ore fine powder has an average particle diameter of 800 mesh to 1200 mesh.
The method for preparing an environmentally-friendly plastic masterbatch material according to claim 1, wherein:

Wherein the polyethylene is a mixture of one or more of high density polyethylene, medium density polyethylene, low density polyethylene.
The method for preparing an environmentally-friendly plastic masterbatch material according to claim 1, wherein:

Wherein the polypropylene is a homopolypropylene.
The invention relates to a method for preparing an environmentally-friendly film, which is characterized in that the environmentally-friendly film is prepared by using the environmentally-friendly plastic masterbatch material obtained by the method according to any one of claims 1 to 6. The preparation method of the environmentally-friendly film comprises the following steps:

Step C: casting the environmentally-friendly plastic masterbatch material into a film by using a casting device, and the casting film forming comprises the following processes:

Step C1, the environmentally-friendly plastic masterbatch material is melted, extruded through a vacuum pump of the casting device, and then flows out through a gap at the front end of the die of the casting device, so that the environmentally-friendly plastic masterbatch material forms a melt film. ;

Step C2, after the melt film leaves the die, reaches a low temperature casting roll surface of the casting device by a predetermined distance, and is cooled and shaped, and is stretched longitudinally and horizontally by using a stretching roll of the casting device. The bidirectional film formed is the environmentally friendly film.
The method for preparing an environmentally friendly film according to claim 6, wherein:

Wherein, the number of the slits at the front end of the die is three, five or seven.
The method for preparing an environmentally friendly film according to claim 6, wherein:

Wherein, the slit width of the front end of the die is 2500 mm, 3000 mm, 3500 mm or 5000 mm.
The invention relates to a method for preparing an environmentally-friendly adhesive tape, which is characterized in that the environmental protection adhesive tape obtained by the method of claim 7 is used for preparing the environmental protection adhesive tape, and the preparation method of the environmental protection adhesive tape comprises the following steps:

Step D: adhesive coating, coating an adhesive on the first working surface of the substrate formed by the film to form an adhesive layer;

Step E: drying, the substrate processed in step D is placed in an oven for drying, and the formed tape is the environmental protection tape.
The method for preparing an environmentally friendly film according to claim 9, wherein:

Wherein, the adhesive is an aqueous glue.