CN112062996B

CN112062996B - Transparent writing quick-drying page film and preparation method thereof

Info

Publication number: CN112062996B
Application number: CN202010959511.1A
Authority: CN
Inventors: 张诗卉; 殷雪皇
Original assignee: Wuxi He Shuo Feng New Material Co ltd
Current assignee: Wuxi He Shuo Feng New Material Co ltd
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2021-11-09
Anticipated expiration: 2040-09-14
Also published as: CN112062996A

Abstract

The invention relates to the technical field of thin films, in particular to a transparent writing quick-drying page film and a preparation method thereof, wherein the transparent writing quick-drying page film comprises a transparent BOPP thin film base layer, a bottom coating, a first writing quick-drying coating and a second writing quick-drying coating, wherein the bottom coating, the first writing quick-drying coating and the second writing quick-drying coating are sequentially coated on the upper surface of the transparent BOPP thin film base layer; the lower surface of the transparent BOPP film base layer is sequentially coated with a bottom coating, a first writing quick-drying coating and a second writing quick-drying coating; the plurality of bottom coatings are respectively and uniformly arranged between two adjacent bottom coatings in the horizontal direction on the upper surface and the lower surface of the transparent BOPP film base layer, and adhesive is filled in gaps between the bottom coatings; the bottom coating is divided into a plurality of parts to be uniformly coated on the surface of the transparent BOPP film base layer, and the monomer area of the bottom coating is reduced, so that the supporting force is strong, two adjacent bottom coatings are connected by using the adhesive, the bonding strength between the bottom coatings is improved, the problem of overlarge deformation caused by pulling is solved, and the bottom coating is not easy to generate pulling deformation and is smoother during writing.

Description

Transparent writing quick-drying page film and preparation method thereof

Technical Field

The invention relates to the technical field of films, in particular to a transparent writing quick-drying page film and a preparation method thereof.

Background

Polyethylene films can be classified into films with different properties such as low density, medium density, high density and crosslinked polyethylene: high density polyethylene films have good heat resistance and mechanical strength, but poor transparency. However, the crosslinked polyethylene film has higher tensile strength, heat resistance, barrier property and heat shrinkage rate than other types of polyethylene products. Polyethylene films are typically homopolymers of ethylene and broadly also include copolymers of ethylene and alpha-olefins or copolymers of polar vinyl resins. The molecular structure and density of polyethylene in the broadest sense are determined by chain scission, and the polymer can be branched in different ways depending on the polymerization conditions.

Some technical schemes related to a writable film and a preparation method thereof also appear in the prior art, for example, a chinese patent with application number 2017101868091 discloses a rewritable scratch-resistant film and a preparation method thereof, wherein the preparation method comprises the following steps: mixing the modified SiO2-TiO2 nano composite material, linear low-density polyethylene and oxidized polyethylene, placing the mixture in a high-speed stirrer at the stirring speed of 600 plus 800rpm and the temperature of 110 ℃, stirring and mixing for 20-30min, and then extruding and granulating the mixture by a double-screw extruder to obtain nano material master batches; mixing the nanometer material mother particles, high density polyethylene and vinyl acetate-ethylene copolymer, placing in a plastic blow molding machine, and blowing to obtain polyethylene film. The film is easy to write, easy to erase and reusable. The surface of the film is scratch-resistant and has long service life; but this transparent book page membrane is a film product, and in the simple use film process, can lead to the film to warp easily owing to dragging, and the film is very easily bent and is out of shape, does not possess certain holding power, when writing when carrying out the pen touch, because the nose point constantly slides on the film, can lead to the film to appear dragging the phenomenon, leads to unable normal writing, also has the product among the prior art to use the mute light PET membrane of individual layer as writing the membrane, its main shortcoming that exists below: the problem of broken strokes is easy to occur in writing, and the writing is discontinuous and not smooth.

In view of the above, in order to overcome the above technical problems, the invention provides a transparent writing quick-drying page film and a preparation method thereof, which adopts a special structure, components and production process to solve the above technical problems.

Disclosure of Invention

In order to make up the defects of the prior art, the invention provides a transparent writing quick-drying page film which comprises a transparent BOPP film base layer, a bottom coating, a first writing quick-drying coating and a second writing quick-drying coating; the transparent BOPP film base layer is used as a middle base layer, and a bottom coating, a first writing quick-drying coating and a second writing quick-drying coating are sequentially coated on the upper surface of the transparent BOPP film base layer; the lower surface of the transparent BOPP film base layer is sequentially coated with a bottom coating, a first writing quick-drying coating and a second writing quick-drying coating; the invention discloses a transparent BOPP film base layer, which comprises a plurality of bottom coatings, wherein the bottom coatings are respectively and uniformly arranged on the upper surface and the lower surface of the transparent BOPP film base layer, a gap of 0.5-1um is formed between every two adjacent bottom coatings in the same horizontal direction, adhesive is filled in the gap between the bottom coatings, the transparent writing quick-drying page film is a film product, the film is easy to deform due to pulling in the simple film using process, the film is easy to bend and deform and does not have a certain supporting force, when a pen touches and writes, the nose tip continuously slides on the film, the film is pulled, so that the normal writing can not be carried out, the bottom coatings are divided into a plurality of parts to be uniformly coated on the surface of the transparent BOPP film base layer, the supporting force is stronger than that of one whole bottom coating due to the fact that the monomer area of the bottom coatings is reduced, the adjacent two bottom coatings are connected by filling with the adhesive and depend on the adhesive for connection, the joint strength between the base coat layers is improved, the problem of overlarge deformation caused by pulling is solved, and the writing is more convenient because the pulling deformation is not easy to generate, the pen touch is smooth during writing; 0.1-0.3um adhesive is sprayed between the transparent BOPP film base layer, the bottom coating layer, the first writing quick-drying coating layer and the second writing quick-drying coating layer, and 0.1-0.3um adhesive is sprayed between different layers, so that the film thickness is improved, the possibility of film deformation is reduced, and the connection between layers can be enhanced due to the use of the adhesive, and the phenomenon that the layers which are contacted with each other fall off and the use effect is influenced due to the fact that the layers generate different forces when written for a long time is avoided.

Preferably, the primer layer is an acrylic adhesive; the writing quick-drying coating I and the writing quick-drying coating II are both formed by mixing acrylic acid adhesive and diatomite in a mixing ratio of 5: 1; the thickness of the first writing quick-drying coating and the thickness of the second writing quick-drying coating are both 3.5-4.5 um; the thickness of the transparent BOPP film base layer is 69-71 um; acrylic acid adhesive, acrylic acid is an important organic synthetic raw material and synthetic resin monomer, and is an ethylene monomer with very high polymerization speed. Is the simplest unsaturated carboxylic acid, consisting of one vinyl group and one carboxyl group. Pure acrylic acid is a colorless clear liquid with a characteristic pungent odor. It is miscible with water, alcohols, ethers and chloroform and is prepared from propylene obtained from an oil refinery. Most of them are used for producing acrylic esters such as methyl acrylate, ethyl acrylate, butyl acrylate, hydroxyethyl acrylate, etc. Acrylic acid and acrylic ester can be homopolymerized and copolymerized, and the polymer is used in the industrial departments of synthetic resin, synthetic fiber, super absorbent resin, building material, coating and the like; the base coat is acrylic acid adhesive and is mainly used for connecting the writing quick-drying coat I and the transparent BOPP film base layer, the viscosity is high, the connectivity is good, the diatomite has the effect of absorbing ink of a fountain pen, the wettability is better than that of kaolin and is different from that of silicon dioxide, the ink of the fountain pen can be effectively absorbed, the writing can be carried out, meanwhile, due to the use of the diatomite, the surface of the transparent writing quick-drying page film is rough, the phenomenon that a steel ball on a character fountain pen cannot easily rotate due to the fact that the writing is inconvenient and difficult to finish writing due to smooth surface of the film is avoided, after the surface of the transparent writing quick-drying page film is rough, the steel ball of the fountain pen can rotate, the character writing is more convenient, the thicknesses of the writing quick-drying coat I and the writing quick-drying coat II are both 3.5-4.5 microns, when the thicknesses of the writing quick-drying coat I and the writing quick-drying coat II are lower than 3.5 microns, the thicknesses of the transparent writing quick-drying page film can easily cause stretching deformation, when the thickness is too thick, the thickness of each layer outside the transparent BOPP film base layer is large, so that the surface of the whole transparent writing quick-drying page film is too soft, the nose tip is easy to sink when the pen is put on, and the transparent writing quick-drying page film is deformed when the nose tip moves, so that unsmooth writing is caused; the thickness of the transparent BOPP film base layer is 69-71um, the transparent BOPP film base layer is used as a supporting base film, the film is easy to break due to too low thickness, and the transparent writing quick-drying page film is too thick due to too thick thickness, so that material waste is caused.

Preferably, the adhesive is formed by mixing aloe gel and diatomite according to a ratio of 2:1, the adhesive is used for improving the connectivity among all layers of the transparent writing quick-drying page film, simultaneously provides supporting force for the transparent writing quick-drying book page film, reduces the possibility that the transparent writing quick-drying book page film is easy to deform, simultaneously the aloe gel has the function of cooling the skin, since the transparent writing quick-drying page film can quickly erase ink marks through the wet rag, during the writing process, because the individual crowd or the hot weather condition, the person holds the pen and the hand sweats easily, easily leads to printing ink to be wiped in the writing process, influences the writing effect, and aloe gel can reduce the body surface temperature and prevent the hand sweats, can reach again and improve between viscosity and the diatomaceous earth and cooperate and improve transparent and write quick-drying page membrane holding power and reduce the possibility that transparent and write quick-drying page membrane warp.

A method for preparing a transparent writing quick-drying sheet film, which is suitable for the transparent writing quick-drying sheet film of any one of claims 1-3, and comprises the following steps:

s1, firstly, conducting rough treatment on the upper and lower surfaces of the transparent BOPP film base layer, if not, conducting rough treatment, wherein the transparent BOPP film base layer is smooth in surface and not beneficial to bonding and adhesion of a subsequent adhesive coating, the rough surface of the transparent BOPP film base layer after rough treatment is more beneficial to bonding of an adhesive, the strength of the transparent writing quick-drying page film at the later stage is fully ensured, and the surface is cleaned after rough treatment, so that the surface is clean and free of dust; baking the rough transparent BOPP film base layer for 5-7min at the baking temperature of 40 ℃; baking the transparent BOPP film base layer to soften the rough part of the surface of the transparent BOPP film base layer, so that the adhesive can be easily blended and bonded together, the bonding strength is improved, and after baking, a layer of adhesive is respectively sprayed on the upper surface and the lower surface of the transparent BOPP film base layer; the sprayed adhesive is more fluid and cannot be quickly condensed due to the fact that the transparent BOPP film base layer is baked, the surface temperature is about 40 ℃, the sprayed adhesive is more firm and adopts a spraying mode, in order to guarantee that the surface of the adhesive on the surface of the transparent BOPP film base layer is uneven and flat, the connection between a base coat and the adhesive coat can be facilitated, the connection strength is improved, and each layer is prevented from falling off due to writing, after the spraying is finished, a plurality of acrylic adhesives horizontally arranged on the upper surface and the lower surface of the transparent BOPP film base layer are respectively coated to serve as the base coat, the gap between every two adjacent base coats on the same horizontal plane is guaranteed to be 0.5-1um, and the base coat coating of the transparent BOPP film base layer is finished;

s2, spraying an adhesive on the bottom coating on the surface of the transparent BOPP film base layer coated with the bottom coating in the step S1, vibrating the transparent BOPP film base layer in the spraying process, enabling the adhesive to be uniformly filled in gaps among the bottom coatings, and ensuring that the adhesive is sprayed on the surface of the bottom coating; after the spraying is finished, coating the first writing quick-drying coating on the surface of the binder on the surface of the base coat, heating and pressing, and in order to ensure that the first writing quick-drying coating is fully adhered to the surface of the binder on the surface of the base coat, and because the fluidity of the binder is increased by heating, the binder is uniformly filled in gaps between the base coats, so that the coating of the first writing quick-drying coating on the base coat is finished;

s3, after the first writing quick-drying coating on the bottom coating is coated in the S2, a binder is sprayed on the surface of the first writing quick-drying coating, after the spraying is finished, small diatomite particles are sprayed on the surface of the binder on the surface of the first writing quick-drying coating, and after the small diatomite particles are pressed on the second writing quick-drying layer, the finally formed transparent writing quick-drying page film can be naturally rough, the rotation of steel balls of a fountain pen is facilitated, characters can be written, meanwhile, the ink absorption capacity of the transparent writing quick-drying page film is improved, the second writing quick-drying layer is coated, pressing is conducted, and the transparent writing quick-drying page film is finished.

Preferably, in S1, the rough treatment of the transparent BOPP film base layer is carried out hole pricking treatment on the surface of the film through a steel needle, when the hole pricking treatment is carried out on the two surfaces of the transparent BOPP film base layer, the holes on the surface of the transparent BOPP film base layer can form powerful connection, so that the connection effect between all layers of the transparent writing quick-drying page film is ensured, the condition that the film is deformed or all layers fall off in the writing process is avoided, the writing is facilitated, and the use is convenient.

Preferably, the steel needle is the area burr product that the surface was not polished, because the steel needle surface is not through the processing of polishing, the steel needle roughness, there is the effect of linking up to transparent BOPP film base layer when pricking the hole, lead to transparent BOPP film base layer can produce the turn-ups deckle edge of different degrees, make transparent BOPP film base layer surface rougher, do benefit to the bonding of adhesive coating and transparent BOPP film base layer, also guarantee to transparent BOPP film base layer basis to support, because deckle edge can appear after the steel needle pricks the hole in transparent BOPP film base layer, when adding thermal treatment in S1, deckle edge can soften can lead to the swing because the spraying adhesive, produce anomalous position, can produce certain pulling force after bonding with adhesive coating each layer, prevent to drop, improve transparent BOPP film base layer' S basis holding power, reduce because the film deformation that the writing leads to or write the inconvenient condition and produce.

The invention has the following beneficial effects:

1. according to the invention, the base coat is divided into a plurality of parts and is uniformly coated on the surface of the transparent BOPP film substrate, the support force of the base coat is inevitably stronger than that of a whole base coat due to the fact that the area of a base coat monomer is reduced, two adjacent base coats are filled and connected by using the adhesive, and are connected by the adhesive, so that the joint strength between the base coats is improved, the problem of overlarge deformation caused by pulling is solved, and the problem that the base coats are difficult to deform due to pulling is solved, the pen is smoothly touched during writing, and the writing is more convenient.

2. According to the invention, 0.1-0.3um adhesive is sprayed among the transparent BOPP film base layer, the bottom coating, the first writing quick-drying coating and the second writing quick-drying coating, and 0.1-0.3um adhesive is sprayed among different layers, so that the film thickness is improved, the possibility of film deformation is reduced, and the connection among the layers can be enhanced due to the use of the adhesive, and the problems that the use effect is influenced due to the falling of the layers which are contacted with each other caused by the force of different forces generated by long-time writing are avoided.

3. According to the invention, the punching treatment is carried out on the surface of the film through the steel needle, when the punching treated transparent BOPP film base layer is sprayed with the adhesive on the two surfaces, powerful connection can be formed through holes on the surface of the transparent BOPP film base layer, the connection effect among all layers of the transparent writing quick-drying page film is ensured, the condition that the film is deformed or all layers fall off in the writing process is avoided, the writing is facilitated, and the use is convenient.

Drawings

The invention is further described with reference to the following figures and embodiments.

Fig. 1 is a schematic view of the structure of the transparent writing quick-drying page film of the present invention.

Fig. 2 is a flow chart of a method for preparing the transparent writing quick-drying page film of the invention.

In the figure: the coating comprises a binder 5, a transparent BOPP film base layer 4, a base coating layer 3, a first writing quick-drying coating layer 2 and a second writing quick-drying coating layer 1.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 2, the transparent writing quick-drying page film of the invention comprises a transparent BOPP film substrate 4, a base coat 3, a first writing quick-drying coating 2 and a second writing quick-drying coating 1; the transparent BOPP film base layer 4 serves as a middle base layer, and a bottom coating 3, a first writing quick-drying coating 2 and a second writing quick-drying coating 1 are sequentially coated on the upper surface of the transparent BOPP film base layer 4; the lower surface of the transparent BOPP film base layer 4 is sequentially coated with a bottom coating 3, a first writing quick-drying coating 2 and a second writing quick-drying coating 1; the plurality of the bottom coatings 3 are respectively and evenly arranged on the upper surface and the lower surface of the transparent BOPP film base layer 4, a gap of 0.5-1um is arranged between every two adjacent bottom coatings 3 in the same horizontal direction, and the adhesive 5 is filled in the gap between every two bottom coatings 3, because the transparent writing quick-drying page film is a film product, the film is easy to deform due to pulling in the process of simply using the film, the film is easy to bend and deform, and does not have a certain supporting force, when writing by pen touch, the film cannot be normally written in the periphery due to the pulling phenomenon of the film caused by the continuous sliding of the nose tip on the film, the bottom coatings 3 are divided into a plurality of parts to be evenly coated on the surface of the transparent BOPP film base layer 4, because the monomer area of the bottom coatings 3 is reduced, the supporting force is inevitably stronger than that of a whole bottom coating 3, and the adhesive 5 is used for filling and connecting the two adjacent bottom coatings 3, the connection is realized by the adhesive 5, so that the bonding strength between the bottom coatings 3 is improved, the problem of overlarge deformation caused by pulling is solved, and the writing is more convenient because the pulling deformation is not easy to generate and the pen touch is smooth during writing; transparent BOPP film basic unit 4, under coat 3, write between quick-drying coating 2 and the quick-drying coating of writing 1 all spray 0.1-0.3um binder 5, spray 0.1-0.3um binder 5 between the different layers, on the one hand be in order to improve film thickness, reduce the possibility that the film warp, on the other hand because binder 5's use, can strengthen the connection between each layer, avoid because write the power that produces different dynamics for a long time, lead to taking place to drop between the layer of mutual contact, influence result of use.

As an embodiment of the present invention, the primer layer 3 is an acrylic adhesive; the writing quick-drying coating I2 and the writing quick-drying coating II 1 are both formed by mixing acrylic acid adhesive and diatomite in a mixing ratio of 5: 1; the thickness of the first writing quick-drying coating 2 and the thickness of the second writing quick-drying coating 1 are both 3.5-4.5 um; the thickness of the transparent BOPP film base layer 4 is 69-71 um; acrylic acid adhesive, acrylic acid is an important organic synthetic raw material and synthetic resin monomer, and is an ethylene monomer with very high polymerization speed. Is the simplest unsaturated carboxylic acid, consisting of one vinyl group and one carboxyl group. Pure acrylic acid is a colorless clear liquid with a characteristic pungent odor. It is miscible with water, alcohols, ethers and chloroform and is prepared from propylene obtained from an oil refinery. Most of them are used for producing acrylic esters such as methyl acrylate, ethyl acrylate, butyl acrylate, hydroxyethyl acrylate, etc. Acrylic acid and acrylic ester can be homopolymerized and copolymerized, and the polymer is used in the industrial departments of synthetic resin, synthetic fiber, super absorbent resin, building material, coating and the like; the primer layer 3 is an acrylic acid adhesive and is mainly used for connecting the writing quick-drying coating I2 and the transparent BOPP film base layer 4, the viscosity is high, the connectivity is good, the diatomite has the effect of absorbing ink of a fountain pen, the wettability is better than that of kaolin and is different from that of silicon dioxide, the ink of the fountain pen can be effectively absorbed, the transparent writing quick-drying page film can be used for writing, meanwhile, due to the use of the diatomite, the surface of the transparent writing quick-drying page film is rough, the situation that a steel ball on a character fountain pen cannot easily rotate due to the fact that the writing is inconvenient and the writing is difficult to complete due to smooth surface of the film, after the surface of the transparent writing quick-drying page film is rough, the steel ball of the fountain pen can rotate, the character writing is more convenient, the thicknesses of the writing quick-drying coating I2 and the writing quick-drying coating II 1 are both 3.5-4.5 microns, when the thicknesses of the writing quick-drying coating I2 and the writing quick-drying coating II 1 are lower than 3.5 microns, the thicknesses of the transparent writing quick-drying page film are too thin, the transparent writing quick-drying page film is easy to stretch and deform, when the thickness is too thick, the thickness of each layer outside the transparent BOPP film base layer 4 is large, so that the surface of the whole transparent writing quick-drying page film is too soft, the nose tip is easy to sink when the pen is put in, and the transparent writing quick-drying page film is deformed when the nose tip moves, so that unsmooth writing is caused; the thickness of the transparent BOPP film base layer 4 is 69-71um, the transparent BOPP film base layer 4 is used as a supporting base film, the film is easy to break due to too low thickness, and the transparent writing quick-drying page film is too thick due to too thick thickness, so that material waste is caused.

In one embodiment of the invention, the adhesive 5 is formed by mixing aloe gel and diatomite according to a ratio of 2:1, the adhesive 5 is used for improving the connectivity between all layers of the transparent writing quick-drying page film, simultaneously provides supporting force for the transparent writing quick-drying book page film, reduces the possibility that the transparent writing quick-drying book page film is easy to deform, simultaneously the aloe gel has the function of cooling the skin, since the transparent writing quick-drying page film can quickly erase ink marks through the wet rag, during the writing process, because the individual crowd or the hot weather condition, the person holds the pen and the hand sweats easily, easily leads to printing ink to be wiped in the writing process, influences the writing effect, and aloe gel can reduce the body surface temperature and prevent the hand sweats, can reach again and improve between viscosity and the diatomaceous earth and cooperate and improve transparent and write quick-drying page membrane holding power and reduce the possibility that transparent and write quick-drying page membrane warp.

s1, firstly, conducting rough treatment on the upper surface and the lower surface of the transparent BOPP film base layer 4, if the rough treatment is not conducted, the transparent BOPP film base layer 4 is smooth in surface and not beneficial to bonding and adhering of a subsequent adhesive coating, the rough surface of the transparent BOPP film base layer 4 after the rough treatment is more beneficial to bonding of an adhesive 5, the strength of the transparent writing quick-drying page film at the later stage is fully ensured, and the surface is cleaned after the rough treatment, so that the surface is clean and free of dust; baking the rough transparent BOPP film base layer 4 for 5-7min at the baking temperature of 40 ℃; baking the transparent BOPP film base layer 4 to soften the rough part of the surface of the transparent BOPP film base layer 4, so that the adhesive can be easily melted and bonded together, the bonding strength is improved, and after baking, spraying a layer of adhesive 5 on the upper surface and the lower surface of the transparent BOPP film base layer 4 respectively; the sprayed adhesive 5 has more fluidity and can not be quickly condensed due to the fact that the transparent BOPP film base layer 4 is baked, the surface temperature is about 40 ℃, the sprayed adhesive 5 can be adhered to the surface of the transparent BOPP film base layer 4 in sufficient time and is firmer, and a spraying form is adopted, so that the adhesive 5 on the surface of the transparent BOPP film base layer 4 is uneven and flat in surface, connection between the base coat 3 and the adhesive coat can be facilitated, the connection strength is improved, falling off of each layer caused by writing is avoided, after spraying is completed, a plurality of acrylic adhesives horizontally arranged on the upper surface and the lower surface of the transparent BOPP film base layer 4 are respectively coated to serve as the base coats 3, the gap between every two adjacent base coats 3 on the same horizontal plane is guaranteed to be 0.5-1um, and coating of the base coats 3 of the transparent BOPP film base layer 4 is completed;

s2, spraying an adhesive 5 on the bottom coating 3 on the surface of the transparent BOPP film base layer 4 coated with the bottom coating 3 in the step S1, vibrating the transparent BOPP film base layer 4 in the spraying process to enable the adhesive 5 to be uniformly filled in gaps among the bottom coating 3, and ensuring that the adhesive 5 is sprayed on the surface of the bottom coating 3; after the spraying is finished, coating the first writing quick-drying coating 2 on the surface of the binder on the surface of the base coating 3, heating and pressing, in order to ensure that the first writing quick-drying coating 2 is fully adhered to the surface of the binder on the surface of the base coating 3, and because the fluidity of the binder 5 is increased by heating, ensuring that the gaps between the base coatings 3 are uniformly filled with the binder 5, and finishing the coating of the first writing quick-drying coating 2 on the base coating 3;

s3, after the first writing quick-drying coating 2 on the base coating 3 in the S2 is coated, the adhesive 5 is sprayed on the surface of the first writing quick-drying coating 2, after the spraying is finished, small diatomite particles are sprayed on the surface of the adhesive 5 on the surface of the first writing quick-drying coating 2, and after the small diatomite particles are pressed on the second writing quick-drying layer, the finally formed transparent writing quick-drying page film can be naturally rough, the rotation of steel balls of a fountain pen is facilitated, characters can be written, meanwhile, the ink absorption capacity of the transparent writing quick-drying page film is improved, then the second writing quick-drying layer is coated, pressing is carried out, and the transparent writing quick-drying page film is finished.

As an embodiment of the invention, in S1, the roughening treatment of the transparent BOPP film base layer 4 is performed by punching the surface of the film with a steel needle, and when the punched transparent BOPP film base layer 4 is coated with the adhesive 5 on both surfaces, strong connection can be formed through the holes on the surface of the transparent BOPP film base layer 4, so as to ensure the connection effect between the layers of the transparent writing quick-drying page film, avoid the deformation of the film or the falling off of the film during the writing process, facilitate the writing, and facilitate the use.

As an embodiment of the invention, the steel needle is a product with burrs and the surface of the steel needle is not polished, and the surface of the steel needle is rough because the surface of the steel needle is not polished, the transparent BOPP film base layer 4 is hooked during punching, so that the transparent BOPP film base layer 4 can generate flanging burrs with different degrees, the surface of the transparent BOPP film base layer 4 is rougher, the adhesion of an adhesive coating and the transparent BOPP film base layer 4 is facilitated, the basic support of the transparent BOPP film base layer 4 is ensured, and the burrs can be generated after the transparent BOPP film base layer 4 is punched by a steel needle, when the heat treatment is performed in S1, the burrs may be softened and may swing due to the sprayed adhesive 5, resulting in irregular positions, can produce certain pulling force after gluing with the adhesive coating, prevent that each layer from droing, improve transparent BOPP film substrate 4's basic holding power, reduce because write the film deformation that leads to or write inconvenient condition and produce.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The transparent writing quick-drying page film is characterized by comprising a transparent BOPP film base layer (4), a bottom coating layer (3), a first writing quick-drying coating layer (2) and a second writing quick-drying coating layer (1); the transparent BOPP film base layer (4) is used as a middle base layer, and a bottom coating (3), a first writing quick-drying coating (2) and a second writing quick-drying coating (1) are sequentially coated on the upper surface of the transparent BOPP film base layer (4); the lower surface of the transparent BOPP film base layer (4) is sequentially coated with a bottom coating (3), a first writing quick-drying coating (2) and a second writing quick-drying coating (1); a plurality of bottom coatings (3) are respectively and uniformly arranged on the upper surface and the lower surface of a transparent BOPP film base layer (4), a gap of 0.5-1um is formed between every two adjacent bottom coatings (3) in the same horizontal direction, a bonding agent (5) is filled in the gap between every two bottom coatings (3), and 0.1-0.3um bonding agent (5) is sprayed between the transparent BOPP film base layer (4), the bottom coatings (3), the writing quick-drying coatings I (2) and the writing quick-drying coatings II (1); the bottom coating (3) is an acrylic adhesive; the writing quick-drying coating I (2) and the writing quick-drying coating II (1) are both formed by mixing acrylic acid adhesive and diatomite in a mixing ratio of 5: 1; the thickness of the first writing quick-drying coating (2) and the thickness of the second writing quick-drying coating (1) are both 3.5-4.5 um; the thickness of the transparent BOPP film base layer (4) is 69-71 um; the adhesive (5) is formed by mixing aloe gel and diatomite according to the ratio of 2:1,

the preparation method comprises the following steps:

s1, firstly, conducting rough treatment on the upper surface and the lower surface of the transparent BOPP film base layer (4), and cleaning the surfaces after ensuring that the surfaces are clean and free of dust; baking the rough transparent BOPP film base layer (4) for 5-7min at the baking temperature of 40 ℃; after baking, respectively spraying a layer of adhesive (5) on the upper surface and the lower surface of the transparent BOPP film base layer (4); after the spraying is finished, respectively coating a plurality of acrylic adhesives which are horizontally arranged on the upper surface and the lower surface of the transparent BOPP film base layer (4) to be used as the bottom coatings (3), ensuring that the gap between every two adjacent bottom coatings (3) on the same horizontal plane is 0.5-1um, and finishing the coating of the bottom coatings (3) of the transparent BOPP film base layer (4);

s2, spraying an adhesive (5) on the bottom coating (3) on the surface of the transparent BOPP film base layer (4) coated with the bottom coating (3) in the step S1, vibrating the transparent BOPP film base layer (4) in the spraying process to enable the adhesive (5) to be uniformly filled in gaps among the bottom coatings (3), and ensuring that the adhesive (5) is sprayed on the surface of the bottom coating (3); after the spraying is finished, coating the writing quick-drying coating I (2) on the surface of the binder on the surface of the base coating (3), and heating and pressing to finish the coating of the writing quick-drying coating I (2) on the base coating (3);

s3, after the first writing quick-drying coating (2) on the base coating (3) in the S2 is coated, spraying an adhesive (5) on the surface of the first writing quick-drying coating (2), after the spraying is finished, spraying small diatomite particles on the surface of the adhesive (5) on the surface of the first writing quick-drying coating (2), then coating a second writing quick-drying coating, and pressing to finish the transparent writing quick-drying page film;

in the S1, the rough treatment of the transparent BOPP film base layer (4) is carried out hole pricking treatment on the surface of the film through a steel needle;

the steel needle is a product with burrs and not polished on the surface.