CN108527986A - A kind of scratch resistant optical arc face protective film of the low rainbow line of high transparency and preparation method - Google Patents

Abstract

The invention discloses scratch resistant optical arc face protective films of the low rainbow line of a kind of high transparency of screen protection technical field of membrane and preparation method thereof, including basal layer and functional layer；The basal layer is release bottom membrane, and the functional layer includes pressure-sensitive layer of silica gel, base membrane layer, anti-scraping coating, protective layer successively along the separate basal layer direction；The preparation method includes：It is coated with the anti-scraping coating, the pressure-sensitive layer of silica gel of other side coating in the side of the base membrane layer, then release bottom membrane is fitted in the pressure-sensitive layer of silica gel, protective layer is fitted on anti-scraping coating, forms protection membrane structure；The protection membrane structure is subjected to truncation, hot pressing, punching molding.The present invention exhausts the air between protective film and screen by pressure-sensitive silica gel floor height venting quality compared with prior art, and is equipped with anti-scraping coating, plays the role of anti-scratch, and rub resistance achievees the effect that protect screen.

Description

A kind of highly transparent and low iridescent anti-scratch optical curved screen protective film and its preparation method

technical field

The invention relates to a high-transparency, low-rainbow-pattern anti-scratch optical curved screen protective film and a preparation method thereof, which belong to the display protection field of electronic products, especially the curved screen protection field.

Background technique

With the rapid development of smart wearable device technology, curved screens are increasingly used in electronic products, especially TVs, computers, and mobile phones. The curved screen has the following characteristics:

The curved screen is small in weight and low in power, which solves the battery life problem to a certain extent;

The curved screen is also more ergonomically designed and more comfortable to wear;

The curved screen has a very high degree of recognition and appearance, giving consumers a better experience;

The curved screen has a reasonable curvature, which conforms to the curvature of the human retina, and makes reading and observation more three-dimensional;

The curved screen is more comfortable to hold with one hand, which reduces the distance between the thumb touching the screen and better meets the needs of one-handed operation on large screens.

The present invention is designed for the protection of curved screens.

Contents of the invention

Aiming at the above-mentioned defects of the prior art, the purpose of the present invention is to provide a high transparency, low iridescent scratch-resistant optical curved screen protective film and its preparation method, which overcomes the high stiffness and inflexibility of the ordinary PET silica gel protective film in the prior art. shortcoming.

The purpose of the present invention is achieved through the following technical solutions:

In the first aspect, the present invention provides a high-transparency, low-iridition scratch-resistant optical curved screen protective film, including a base layer and a functional layer; the base layer is a release base film layer, and the functional layer is away from the base layer. The direction of the bottom layer sequentially includes a pressure-sensitive silicone layer, a base film layer, an anti-scratch coating, and a protective layer.

Preferably, in the protective film, the release base film layer has a thickness of 36-50 μm, the pressure-sensitive silicone layer has a thickness of 35-45 μm, the base film layer has a thickness of 90-110 μm, and the scratch-resistant coating has a thickness of 3 -5μm, the thickness of the protective layer is 36-50μm.

Preferably, the protective layer sequentially includes a protective adhesive layer and a base layer of the protective layer along a direction away from the base layer; the thickness ratio of the protective adhesive layer and the base layer of the protective layer is 1:(3-5).

Preferably, the surface of the base film layer is sunken to form several long grooves; the long grooves extend straight along the longitudinal axis of the base film layer; on the surface of the same base film layer, the longitudinal axis directions of the long grooves are consistent.

Preferably, on the surfaces of different base film layers, the longitudinal axes of the long grooves intersect.

Preferably, the width of the opening of the elongated groove is smaller than that of the bottom thereof in the transverse direction.

Preferably, the width of the opening of the long groove is 2-10 μm, and the depth of the long groove is 5-10 μm.

Preferably, the long groove is trapezoidal or arc-shaped in the cross-sectional direction.

Preferably, the trapezoid is an isosceles trapezoid.

Preferably, the base angle of the isosceles trapezoid is 45°.

Preferably, the material of the base layer of the protective layer includes PET, PP, PE, etc., preferably PET; the material of the protective adhesive layer is pressure-sensitive adhesive, including silica gel, acrylic adhesive, etc., preferably silica gel.

Preferably, the anti-scratch coating is a UV-cured hardened coating with a surface hardness ≥ 2H, an abrasion resistance of 1KG weight #0000 steel wool for 2000 times without scratches, and a water drop rate > 99°.

Preferably, the light transmittance of the base film layer is >90%, and the material of the base film layer is PET substrate.

Preferably, the adhesive force of the pressure-sensitive silicone layer is 0-100g/inch. If the adhesive force is too heavy, when the protective film is attached to the curved screen, due to the heavy viscosity, the user will feel heavy when tearing off and peeling off, and the experience will be poor; at the same time, the exhaust performance will deteriorate, and air bubbles will easily occur.

Preferably, the raw material types and weight contents of the pressure-sensitive silicone layer are: 80-100 parts of organopolysiloxane, 0.5-0.8 parts of silane coupling agent, 0.5-0.8 part of organohydrogen polysiloxane, platinum complex Compound catalyst 0.8-1.0 parts.

Preferably, the release base film layer is specifically a fluorine-containing polymethylsiloxane resin film.

In a second aspect, the present invention provides a method for preparing the protective film for the scratch-resistant optical curved screen with high transparency and low rainbow pattern, comprising the following steps:

One side of the base film layer is coated with the anti-scratch coating, the other side is coated with a pressure-sensitive silicone layer, and then the release base film layer is attached to the pressure-sensitive silicone layer, and the protective layer is pasted. Combined with the anti-scratch coating to form a protective film structure;

The protective film structure can be shaped by flat cutting, hot pressing and punching.

As a situation of the embodiment, the conditions of the hot pressing are: 350°C, 3-5s.

Compared with the prior art, the beneficial effects of the embodiments of the present invention are:

In the invention, the air between the protective film and the screen is exhausted through the high exhaust of the pressure-sensitive silica gel layer, and an anti-scratch coating is provided to play the role of anti-scratch and anti-friction to achieve the effect of protecting the screen. In addition, the present invention makes the protective film have a reasonable radian through the hot pressing forming process, and covers the curved screen obediently.

Description of drawings

Fig. 1 is a structure diagram of a highly transparent and low iridescent anti-scratch optical curved screen protective film provided by an embodiment of the present invention;

Among them, 10-release bottom film layer, 20-pressure-sensitive silicone layer, 21-first strip, 30-base film layer, 31-first long groove, 32-second long groove, 40-scratch-resistant coating , 41-second strip, 50-protective layer.

specific embodiment

The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

Please refer to Fig. 1, the embodiment of the present invention provides a kind of highly transparent and low iridescent anti-scratch optical curved screen protective film 100: comprising base layer and functional layer; The layers include a pressure-sensitive silicone layer 20 , a base film layer 30 , an anti-scratch coating 40 , and a protective layer 50 in sequence along the direction away from the base layer. The function of the protective layer 50 is to protect the anti-scratch layer from dirt; the anti-scratch coating 40 has excellent anti-fouling properties, and its water drop angle is >99°; the base film layer 30 has only a slight rainbow pattern under any light , the screen reading clarity is high, and will not affect the observer; the release bottom film layer 10 is specifically a fluorine-containing polymethylsiloxane resin film, which plays the role of anti-adhesive isolation from the pressure-sensitive silicone layer 20 .

In some embodiments, the thickness of the protective film 100 for the anti-scratch optical curved screen with high transparency and low rainbow pattern is as follows: the thickness of the release base film layer 10 is 36 μm, the thickness of the pressure-sensitive silicone layer 20 is 35 μm, and the thickness of the base film layer is 36 μm. The thickness of 30 is 110 μm, the thickness of anti-scratch coating 40 is 4 μm, and the thickness of protective layer 50 is 40 μm; The thickness of the release base film layer 10 is 40 μm, the thickness of the pressure-sensitive silicone layer 20 is 40 μm, the thickness of the base film layer 30 is 100 μm, the thickness of the anti-scratch coating 40 is 5 μm, and the thickness of the protective layer 50 is 36 μm; In some embodiments, the film layer thickness of the highly transparent and low iridescent anti-scratch optical curved screen protective film 50 is as follows: the thickness of the release base film layer 10 is 50 μm, the thickness of the pressure-sensitive silicone layer 20 is 45 μm, and the base film layer 30 The thickness of the anti-scratch coating 40 is 3 μm, and the thickness of the protective layer 50 is 50 μm.

In some embodiments, the protective layer 50 sequentially includes a protective adhesive layer and a protective layer base layer along the direction away from the base layer, and the thickness ratio of the protective adhesive layer and the protective layer base layer is 1:3; in other embodiments, The thickness ratio of the protective adhesive layer and the base layer of the protective layer is 1:4; in other embodiments, the thickness ratio of the protective adhesive layer and the base layer of the protective layer is 1:5.

In some embodiments, the surface of the base film layer 30 in contact with the pressure-sensitive silicone layer 20 is sunken to form several first long grooves 31, and the surface of the pressure-sensitive silicone layer 20 in contact with the base film layer 30 is raised to form several first long grooves. strip 21, the first long groove 31 is structurally matched with the first long strip 21, and is used to accommodate the first long strip 21; the base film layer 30 is in contact with the scratch-resistant coating 40 The surface is sunken to form several second long grooves 32, and the surface of the anti-scratch coating 40 in contact with the base film layer 30 is raised to form several second long strips 41, and the second long grooves 32 are connected to the second long grooves. The bar 41 is structurally matched for receiving said second elongated bar 41 . The function of this technical feature is to make the base film layer 30 and the pressure-sensitive silicone layer 20 and the anti-scratch coating 40 closely bonded to prevent separation of the layer structure.

In some embodiments, both the first long grooves 31 and the second long grooves 32 extend linearly on the base film layer along their longitudinal axes, the longitudinal axes of several first long grooves 31 are consistent, and several of the first long grooves 31 are consistent in direction. The direction of the longitudinal axis of the second long groove 32 remains the same. The effect of this technical feature is to facilitate the preparation of the high transparency and low iridescent anti-scratch optical curved screen protective film 100, specifically to facilitate the two surfaces of the base film layer 30. When the pressure-sensitive silicone layer 20 and the anti-scratch coating 40 are applied, the paint of the pressure-sensitive silica gel layer 20 is filled into the first long groove 31, and the paint of the anti-scratch coating 40 enters the second long groove 32, and the first long groove 31 and the second long groove 32 can be ensured. The paint in the second long groove 32 is evenly filled, increasing the connection strength between the layers; the longitudinal axis directions of the first long groove 31 and the second long groove 32 intersect, which is more conducive to the pressure-sensitive silicone layer 20, the base film The bonding strength between the layer 30 and the anti-scratch coating 40.

In some embodiments, the width of the cross-sectional opening of the first long groove 31 and the second long groove 32 is smaller than the bottom thereof. The firmness of the combination of layers 40 prevents separation between layers.

In some embodiments, the width of the cross-sectional opening of the first long groove 31 and the second long groove 32 is 2 μm, and the depth of the cross-section of the first long groove 31 and the second long groove 32 is 5 μm; In other embodiments, the width of the cross-sectional opening of the first long groove 31 and the second long groove 32 is 6 μm, and the depth of the cross-section of the first long groove 31 and the second long groove 32 is 8 μm; In some other embodiments, the width of the cross-sectional opening of the first long groove 31 and the second long groove 32 is 10 μm, and the depth of the cross-section of the first long groove 31 and the second long groove 32 is 10 μm. .

In some embodiments, the cross-sections of the first long groove 31 and the second long groove 32 are trapezoidal, more preferably isosceles trapezoidal, especially, the base angle of the isosceles trapezoid is 45°, such that The technical feature is more conducive to the separation of the pressure-sensitive silicone layer 20 , the scratch-resistant coating 40 and the base film layer 30 . In other embodiments, the cross-sections of the first long groove 31 and the second long groove 32 are arc-shaped, please refer to FIG. 1 .

In the above-mentioned embodiments, in some embodiments, the material of the base layer of the protective layer is PET, and the material of the protective adhesive layer is silica gel; in other embodiments, the material of the base layer of the protective layer is PP or PE, and the material of the protective adhesive layer is acrylic glue, etc. Other pressure sensitive adhesives. The inventor found that when the material of the base layer of the protective layer is PET and the material of the protective adhesive layer is silica gel, the effect of the protective film of the present invention is better. performance and improve yield rate, while the excellent light transmission and exhaust performance of silica gel can improve product quality, avoid generation of air bubbles, and users have a better experience when reading through the protective film of the present invention.

In the above-mentioned embodiment, the anti-scratch coating 40 is a hardened coating cured by ultraviolet rays, its surface hardness is ≥2H, and its wear resistance reaches 1KG weight #0000 steel wool for 2000 times without scratches, and its water drop degree is >99°. If the hardness is less than 2H, the scratch resistance of the hardened coating will be weakened, scratches are likely to occur, and the appearance of the product will be affected; only when the hardness is greater than 2H, the scratch resistance will be better. It should be noted that the existing UV curable coatings (such as the anti-scratch products produced by Zhongshan Nuobijia Optical Material Co., Ltd.) that meet the above hardness, abrasion resistance and water drop can be used to prepare the hardened coating.

In the above embodiment, the light transmittance of the base film layer 30 is >90%, and the material of the base film layer 30 is PET substrate.

In the above-mentioned embodiments, the adhesive force of the pressure-sensitive silicone layer 20 is 0-100g/inch. If the adhesive force is overweight, when the protective film is attached to the curved screen, due to the heavy viscosity, the user will feel heavy when tearing it off. , the experience is poor; at the same time, the exhaust performance becomes poor, and it is easy to generate air bubbles. In some embodiments, the raw material type and weight content of the pressure-sensitive silicone layer 20 are: 80 parts of organopolysiloxane, 0.5 part of silane coupling agent, 0.5 part of organohydrogenpolysiloxane, platinum complex 0.8 parts of catalyst; in some other embodiments, the type of raw material and weight content of the pressure-sensitive silicone layer 20 are: 90 parts of organopolysiloxane, 0.6 part of silane coupling agent, 0.7 part of organohydrogenpolysiloxane , 0.9 parts of a platinum complex catalyst; in some embodiments, the type of raw material and its weight content of the pressure-sensitive silicone layer 20 are 100 parts of organopolysiloxane, 0.8 part of silane coupling agent, organohydrogen polysiloxane 0.8 part of oxane, 1.0 part of platinum complex catalyst.

In the above-mentioned embodiment, the release base film layer 10 is specifically a fluorine-containing polymethylsiloxane resin film, which plays a role of anti-adhesive isolation from the pressure-sensitive silicone layer 20 .

The highly transparent and low iridescent anti-scratch optical curved screen protective film 100 provided by the present invention is obtained by the following preparation method:

Coat the anti-scratch coating 40 on one side of the base film layer 30, and coat the pressure-sensitive silicone layer 20 on the other side, and then stick the release base film layer 10 on the pressure-sensitive silicone layer 20 1. Laminating the protective layer 50 on the anti-scratch coating 40 to form a protective film structure;

The protective film structure can be flat-cut, hot-pressed and punched into shape;

Among them, the conditions of hot pressing are controlled at 350° C. for 3-5 s. If the hot-pressing temperature is not enough, or the time is too short, the protective film structure will not have enough radians, and cannot fit well on the curved glass screen, resulting in a high failure rate in subsequent processes. If the temperature is too high or the time is too long, each layer of the protective film structure will be easily deformed, resulting in poor appearance such as air bubbles.

In order to bring out the prominent substantive features and remarkable progress of the high transparency and low iridescent anti-scratch optical curved screen protective film 100 of the present invention, the inventors sampled the above-mentioned embodiments (see Table 1 for the characteristics of the samples), and set the samples Comparative sample (seeing table 2), the preparation method of sample 1,2,3 and comparative sample 1,2,3 is identical, and difference is only in relevant parameter setting:

Table 1

After testing and analysis, the protective films of sample 1, sample 2, and sample 3 have reasonable radians, and are obediently attached to the curved screen. Scratch coating, play the role of anti-scratch, anti-friction, to achieve the effect of protecting the screen. Relatively speaking, sample 3 is the most preferred in terms of viscosity, hardness, scratch resistance, outgassing, appearance, and formability.

Table 2

In order to highlight the importance of the film structure of the present invention and its material properties, the inventors tested the formation indicators of sample 1, comparative sample 1, comparative sample 2, and comparative sample 3, and the results are shown in Table 3:

table 3

Through the above analysis, it can be seen that the difference between comparative sample 1 and sample 1 lies in the thickness of the pressure-sensitive silica gel layer 20, the composition of raw materials, the thickness of the scratch-resistant coating 40, and the thickness ratio of the protective adhesive layer and the protective layer base layer in the protective layer 50. The difference here is Basically, the appearance and formability of comparative sample 1 are significantly worse than sample 1. It can be seen that the thickness of the pressure-sensitive silicone layer 20, the composition of raw materials, the thickness of the scratch-resistant coating 40, the thickness of the protective rubber layer and the base layer of the protective layer in the protective layer 50 The ratio is crucial to the realization of the effect of the present invention, and together they have a synergistic effect on the ideal film effect, which is the inventor's creative choice based on the realization of the purpose. It can also be known from the above analysis that the difference between comparative sample 2 and sample 1 lies in the structure of the base film layer 30, the thickness ratio of the protective adhesive layer and the protective layer base layer in the protective layer 50, and on the basis of this difference, the comparative sample 2 is different in viscosity. , appearance, and formability are significantly poor, which shows that the structure of the base film layer 30, the thickness ratio of the protective rubber layer and the protective layer base layer in the protective layer 50 are irreplaceable for the realization of the effect of the present invention, although the thickness of the film layer and its structure The characteristics are the routine choices of those skilled in the art, but the structure of the present invention has not been disclosed, and the effect is remarkable, so it has outstanding substantive features and significant progress. It can be further seen from the above table that the difference between comparative sample 3 and sample 1 is that the thickness of the film layer exceeds the range limited by the present invention. As a result, the protective film has poor exhaust performance and contains air bubbles, too low viscosity, poor compliance, and the curvature after hot pressing Not enough, it can be seen that the thickness of the five-layer film structure of the protective film of the present invention is crucial to the performance of the protective film. Too high or too low thickness of some film layers will have a negative effect on the performance of the protective film of the present invention, which also shows that the film of the present invention The limitation of layer thickness is the result of the inventor's creative choice, rather than being set according to common technical knowledge in the field.

It should be noted that preferred embodiments of the present invention are given in the description of the present invention, but the present invention can be implemented in many different forms, and are not limited to the embodiments described in the description, and these embodiments are not As an additional limitation on the content of the present invention, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive. Moreover, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the present invention; further, for those of ordinary skill in the art, improvements or changes can be made according to the above description , and all these improvements and transformations should belong to the scope of protection of the appended claims of the present invention.

Claims (10)

1. a kind of low scratch resistant optical arc face protective film (100) of rainbow line of high transparency, which is characterized in that including basal layer and function Layer；The basal layer is release bottom membrane (10), and the functional layer includes pressure-sensitive silica gel successively along the separate basal layer direction Layer (20), base membrane layer (30), anti-scraping coating (40), protective layer (50).

2. the low scratch resistant optical arc face protective film (100) of rainbow line of high transparency according to claim 1, which is characterized in that In the protective film, the thickness of release bottom membrane (10) is 36-50 μm, and the thickness of pressure-sensitive layer of silica gel (20) is 35-45 μm, basement membrane The thickness of layer (30) is 90-110 μm, and the thickness of anti-scraping coating (40) is 3-5 μm, and the thickness of protective layer (50) is 36-50 μm.

3. the low scratch resistant optical arc face protective film (100) of rainbow line of high transparency according to claim 1 or 2, feature exists In the protective layer (50) includes protection glue-line, protective layer base successively along separate release bottom membrane (10) direction；It is described Protect glue-line, the ratio between the thickness of protective layer base is 1：(3-5).

4. the low scratch resistant optical arc face protective film (100) of rainbow line of high transparency according to claim 3, which is characterized in that The material of the protective layer base includes PET, PP, PE；The material of the protection glue-line is pressure sensitive adhesive.

5. the low scratch resistant optical arc face protective film (100) of rainbow line of high transparency according to claim 1 or 2, feature exists It is the hardening coat of ultraviolet curing in, the anti-scraping coating (40), case hardness >=2H, abrasion resistance reaches 1KG counterweights # 0000 no marking of steel wool 2000 times, 99 ° of water droplet degree ＞.

6. the low scratch resistant optical arc face protective film (100) of rainbow line of high transparency according to claim 1 or 2, feature exists In the selection of the light transmittance ＞ 90% of the base membrane layer (30), the base membrane layer are PET base material.

7. the low scratch resistant optical arc face protective film (100) of rainbow line of high transparency according to claim 1 or 2, feature exists In the viscous force of the pressure-sensitive layer of silica gel (20) is in 0-100g/inch；

The raw material type and its weight content of the pressure-sensitive layer of silica gel (20) be：80-100 parts of organopolysiloxane, it is silane coupled 0.5-0.8 parts of agent, 0.5-0.8 parts of organic hydrogen polysiloxanes, 0.8-1.0 parts of platinum complex compound catalyst.

8. the low scratch resistant optical arc face protective film (100) of rainbow line of high transparency according to claim 1 or 2, feature exists In, the release bottom membrane (10) be specially fluorine-containing methyl silicone resins film.

9. a kind of preparation according to the scratch resistant optical arc face protective film (100) of the low rainbow line of high transparency described in claim 1 to 8 Method, which is characterized in that include the following steps：

It is coated with the anti-scraping coating (40), the pressure-sensitive layer of silica gel (20) of other side coating in the side of the base membrane layer (30), then will Release bottom membrane (10) is fitted on the pressure-sensitive layer of silica gel (20), protective layer (50) is fitted on anti-scraping coating (40), shape At protection membrane structure；

The protection membrane structure is subjected to truncation, hot pressing, punching molding.

10. the preparation method of the low scratch resistant optical arc face protective film (100) of rainbow line of high transparency according to claim 9, It is characterized in that, the condition of the hot pressing is：350 DEG C, 3-5s.