CN112538318A - Self-adhesive protective film for liquid crystal backlight light guide plate and production method thereof - Google Patents

Self-adhesive protective film for liquid crystal backlight light guide plate and production method thereof Download PDF

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CN112538318A
CN112538318A CN202011375509.6A CN202011375509A CN112538318A CN 112538318 A CN112538318 A CN 112538318A CN 202011375509 A CN202011375509 A CN 202011375509A CN 112538318 A CN112538318 A CN 112538318A
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mass
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protective film
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CN112538318B (en
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叶青松
吴文武
程赛标
郎宇奇
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Novel Huangshan Packaging Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/04—Homopolymers or copolymers of ethene
    • C09J123/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2353/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/10—Homopolymers or copolymers of propene
    • C08J2423/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/04—Presence of homo or copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/04—Presence of homo or copolymers of ethene
    • C09J2423/046—Presence of homo or copolymers of ethene in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/10—Presence of homo or copolymers of propene
    • C09J2423/106—Presence of homo or copolymers of propene in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2453/00—Presence of block copolymer
    • C09J2453/006—Presence of block copolymer in the substrate

Abstract

The invention relates to a liquid crystal backlight light guide plate self-adhesive protective film and a production method thereof, belonging to the field of film materials, wherein the protective film is composed of a self-adhesive layer, an intermediate layer and a uncoiling layer which are sequentially connected; the self-adhesive layer comprises 70-80 parts by mass of low-density polyethylene and 20-30 parts by mass of soft rubber resin, the middle layer comprises 40-60 parts by mass of low-density polypropylene and 40-60 parts by mass of high-density polyethylene, and the uncoiling layer comprises 40-55 parts by mass of block copolymer polypropylene, 40-55 parts by mass of low-density polyethylene and 2-5 parts by mass of a shedding agent. Compared with the existing protective film, the self-adhesive protective film prepared by the invention can be torn off for re-pasting after being pasted on the light guide plate, the adhesive force is stable, the adhesive force change is small, meanwhile, the influence of the temperature change on the adhesive force of the protective film is not large, the adhesive force is controlled within a standard range, and the normal production and processing requirements can be met.

Description

Self-adhesive protective film for liquid crystal backlight light guide plate and production method thereof
Technical Field
The invention relates to the field of packaging, in particular to a liquid crystal backlight light guide plate self-adhesive protective film and a production method thereof.
Background
The light guide plate is formed by utilizing an optical acrylic/PC plate and then printing light guide points on the bottom surface of the optical acrylic plate by using laser engraving, V-shaped cross grid engraving and UV screen printing technologies through a high-tech material with extremely high reflectivity and no light absorption. The optical-grade acrylic sheet is used for absorbing the light emitted from the lamp to stay on the surface of the optical-grade acrylic sheet, when the light irradiates each light guide point, the reflected light can be diffused towards each angle, and then the reflected light is damaged and is emitted from the front surface of the light guide plate. The light guide plate can uniformly emit light through various light guide points with different densities and sizes. The reflecting sheet is used for reflecting the light exposed from the bottom surface back to the light guide plate so as to improve the use efficiency of the light; under the condition of equal area brightness, the luminous efficiency is high and the power consumption is low.
The backlight source is a key product of liquid crystal display, the brightness of the backlight source is related to the display effect of the whole product, and the key part determining the backlight brightness is the light guide plate. The light guide plate is a product with high transparency and high surface cleanliness, and is particularly important for protecting the light guide plate in the production, processing and transportation processes. Therefore, it is necessary to develop a packaging material that can protect the light guide plate during the processing and transportation of the light guide plate, and can be torn off after being assembled.
The existing light guide plate protective film can not be attached again after being adhered to the light guide plate and torn off, and the production consumption is large; the viscosity is unstable, and particularly, the viscosity fluctuates greatly along with the change of temperature, so that the condition of too low or too high viscosity can occur, and the normal production requirement cannot be met; meanwhile, after the protective film is torn off, the surface of the light guide plate has residual glue, so that the light guide plate cannot be used; and the protective film is stuck on the light guide plate, so that micromolecular substances are separated out, and the light emitting effect of the light guide plate is influenced.
Disclosure of Invention
In order to solve the technical problems, the invention provides the self-adhesive protective film for the liquid crystal backlight light guide plate and the production method thereof.
In order to realize one of the purposes of the invention, the invention adopts the following technical scheme:
a liquid crystal backlight light guide plate self-adhesive protective film is composed of a self-adhesive layer, an intermediate layer and a uncoiling layer which are sequentially connected; the self-adhesive layer comprises 70-80 parts by mass of low-density polyethylene and 20-30 parts by mass of soft rubber resin, the middle layer comprises 40-60 parts by mass of low-density polypropylene and 40-60 parts by mass of high-density polyethylene, and the uncoiling layer comprises 40-55 parts by mass of block copolymer polypropylene, 40-55 parts by mass of low-density polyethylene and 2-5 parts by mass of a shedding agent.
Preferably, the self-adhesive layer comprises 75 parts by mass of low-density polyethylene and 25 parts by mass of a soft rubber resin; the middle layer comprises 50 parts by mass of low-density polypropylene and 50 parts by mass of high-density polyethylene, and the unwinding layer comprises 50 parts by mass of block copolymer polypropylene, 50 parts by mass of low-density polyethylene and 2 parts by mass of a shedding agent.
Preferably, the low-density polyethylene of the self-adhesive layer and the low-density polyethylene of the unwound layer are both LF580 manufactured by japan polyethylene corporation, and the soft rubber resin of the self-adhesive layer is G1657 manufactured by kraton polymers corporation; the low density polyethylene of the middle layer is 150BW produced by Exxon Mobil, and the high density polyethylene of the middle layer is HTA-108 produced by Exxon Mobil; the block copolymer polypropylene of the unwinding layer is BF308 produced by Korea Korean Dondall chemical industry, and the opening agent of the unwinding layer is TC003F produced by Zhejiang Vicky new material company.
Another object of the present invention is to provide: a production method of a liquid crystal backlight light guide plate self-adhesive protective film comprises the following steps:
s1, respectively putting materials contained in the self-adhesive layer, the middle layer and the uncoiling layer into corresponding material suction barrels of the multilayer co-extrusion casting machine according to the component proportion requirements, and conveying the materials into an extruder hopper of the casting machine through the vacuum negative pressure of the casting machine to be plasticized into a melt;
s2, extruding the melt in the step S1 through a screw of an extruder, filtering through a filter, distributing to a die head through a distributor, and cooling through a casting roller and a cooling roller in sequence to form a solid film;
and S3, drawing the solid film in the step S2 by a drawing roller of a casting machine, sequentially processing the solid film by a thickness measuring device and a qualitative device of the casting machine, winding the solid film into a mother roll, performing aging treatment on the mother roll, and cutting to obtain the self-adhesive protective film.
Preferably, the temperatures of the extruder barrels of the self-adhesive layer in the step S1 are 210 ℃, 225 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃; the temperatures of the extruder barrels of the middle layer are respectively 90 ℃, 200 ℃, 220 ℃, 225 ℃, 225 ℃, 225 ℃, 225 ℃ and 225 ℃; the temperatures of the extruder barrels of the unwound layer were 215 ℃, 225 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃ respectively.
Preferably, the length-to-diameter ratio L/D of the extruder screw used in step S2 is not less than 34; in S2, the casting roll was subjected to the matte treatment, and the surface roughness of the casting roll was 0.45.
Preferably, in step S2, the melt is filtered by a general mat-type welded filter screen and a "one-type" disc-type long-acting filter, wherein the mat-type welded filter screen has a 100/200/400/600/100/20-mesh structure.
Preferably, in the step S3, the thickness measuring device automatically measures the thickness, displays the thickness and feeds the thickness back to the thermal expansion screw of the die head, the automatic die head adjusts the gap, and the die head is a coat hanger type die head.
Preferably, the temperature of the qualitative processing in step S3 is set to 75 deg.C, 65 deg.C, 55 deg.C, 40 deg.C.
Preferably, the temperature of the aging treatment in step S3 is 45 ℃, the humidity is 60%, and the aging time is 36 hours.
Compared with the prior art, the invention has the beneficial effects that:
1) compared with the existing protective film, the self-adhesive protective film prepared by the invention can be torn off for re-pasting after being pasted on the light guide plate, the adhesive force is stable, the adhesive force change is small, meanwhile, the influence of the temperature change on the adhesive force of the protective film is small, the adhesive force is controlled within a standard range, and the normal production and processing requirements can be met; the self-adhesive protective film prepared by the invention is not residual glue after being adhered to a light guide plate and is not precipitated after being adhered to the light guide plate for a long time, so that the protective requirement of the light guide plate can be met.
2) The self-adhesive layer of the protective film has good adhesive force and thermal stability and is free from precipitation; the crystallinity of the intermediate layer is high, the medium-resistant stability is good, the processing performance is excellent, the opening of the uncoiling layer is good, the uncoiling is easy, and no precipitation exists.
3) The soft rubber resin (the brand is G1657 produced by Koteng polymer company in America) used in the self-adhesive layer has stable adhesive force and does not precipitate; the polyolefin (LF 580 made by Japan polyethylene Co., Ltd.) used has good compatibility, low crystallinity and good processability, so that the self-adhesive layer can reach certain stable adhesion, the anti-adhesive layer can reach good anti-adhesive effect, and the self-adhesive layer is easy to unwind, easy to produce and process and convenient to reduce the production cost. The polyethylene (HTA-108 produced by Exxon Mobil) used in the middle layer has high crystallinity, good stiffness and good medium resistance; the low density polyethylene (150 BW manufactured by Exxon Mobil) used had the advantages of low crystal point and no precipitation. The opening agent (TC 003F produced by Zhejiang Uykha new material) used by the uncoiling layer has good opening property; the polyolefin (the trademark is LF580 produced by Japan polyethylene Co., Ltd.) used has the advantages of low crystallization point, excellent processability, good toughness, good medium resistance, heat resistance and cold resistance; the block copolymer polypropylene (BF 308 produced by Korea Korean Huadada chemical industry) has extremely low crystal point, good transparency and good release performance.
4) The raw materials selected by the invention ensure that the self-adhesive layer, the middle layer and the uncoiling layer have excellent processing performance and low crystal points and precipitation, and ensure that the produced self-adhesive protective film has the advantages of stable adhesive force, no residual adhesive, no precipitation and replacability. The control of the thickness of each layer can ensure that the film can keep the characteristics of stable adhesion and the like, simultaneously can reduce the cost to the minimum, and simultaneously has excellent film processing performance. The invention uses the setting device to process, can cure the film on line, and ensures the stability of the film production product. The invention uses the curtain coating roller to carry out the fog surface treatment, the surface roughness is 0.45, so that the produced film is not easy to adhere and is easy to process. The invention enables the film to fully release internal stress through aging treatment, and maintains the stability of the film.
Drawings
FIG. 1 is a block diagram of the present invention.
The designations in the drawings have the following meanings:
1-self-adhesive layer, 2-middle layer and 3-uncoiling layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.
The production method of the self-adhesive protective film of the liquid crystal backlight light guide plate comprises the following steps:
s1, respectively putting the materials contained in the self-adhesive layer 1, the middle layer 2 and the uncoiling layer 3 into corresponding material suction barrels of a multi-layer co-extrusion casting machine according to the component proportion requirements, and conveying the materials into an extruder hopper of the casting machine through the vacuum negative pressure of the casting machine to plasticize the materials into a melt;
s2, extruding the melt in the S1 through an extruder screw, filtering through a filter, distributing to a die head through a distributor, and cooling through a casting roller and a cooling roller in sequence to form a solid film;
and S3, drawing the solid film in the step S2 by a drawing roller of a casting machine, sequentially processing the solid film by a thickness measuring device and a qualitative device of the casting machine, winding the solid film into a mother roll, performing aging treatment on the mother roll, and cutting to obtain the self-adhesive protective film.
Example 1
S1, weighing 75 parts by mass of polyethylene and 25 parts by mass of soft rubber resin in the self-adhesive layer 1, 50 parts by mass of low-density polypropylene and 50 parts by mass of high-density polyethylene in the middle layer 2, 50 parts by mass of block copolymer polypropylene, 50 parts by mass of low-density polyethylene and 2 parts by mass of a tapping agent in the uncoiling layer 3, respectively putting materials contained in the self-adhesive layer 1, the middle layer 2 and the uncoiling layer 3 into corresponding material suction barrels of the multilayer co-extrusion casting machine, and conveying the materials into an extruder hopper of the casting machine through the vacuum negative pressure of the casting machine to plasticize the materials into a melt;
s2, extruding the melt in the step S1 through a screw of an extruder, filtering through a filter, distributing to a die head through a distributor, and cooling through a casting roller and a cooling roller in sequence to form a solid film;
and S3, drawing the solid film in the step S2 by a drawing roller of a casting machine, sequentially processing the solid film by a thickness measuring device and a qualitative device of the casting machine, winding the solid film into a mother roll, performing aging treatment on the mother roll, and cutting to obtain the self-adhesive protective film.
Example 2
S1, weighing 70 parts by mass of polyethylene and 30 parts by mass of soft rubber resin in the self-adhesive layer 1, 45 parts by mass of low-density polypropylene and 55 parts by mass of high-density polyethylene in the middle layer 2, 49 parts by mass of block copolymer polypropylene, 48 parts by mass of low-density polyethylene and 3 parts by mass of a tapping agent in the uncoiling layer 3, respectively putting materials contained in the self-adhesive layer 1, the middle layer 2 and the uncoiling layer 3 into corresponding material suction barrels of the multilayer co-extrusion casting machine, and conveying the materials into an extruder hopper of the casting machine through the vacuum negative pressure of the casting machine to plasticize the materials into a melt;
s2, extruding the melt in the step S1 through a screw of an extruder, filtering through a filter, distributing to a die head through a distributor, and cooling through a casting roller and a cooling roller in sequence to form a solid film;
and S3, drawing the solid film in the step S2 by a drawing roller of a casting machine, sequentially processing the solid film by a thickness measuring device and a qualitative device of the casting machine, winding the solid film into a mother roll, performing aging treatment on the mother roll, and cutting to obtain the self-adhesive protective film.
Example 3
S1, weighing 80 parts by mass of polyethylene and 20 parts by mass of soft rubber resin in the self-adhesive layer 1, 55 parts by mass of low-density polypropylene and 45 parts by mass of high-density polyethylene in the middle layer 2, 50 parts by mass of block copolymer polypropylene, 50 parts by mass of low-density polyethylene and 3 parts by mass of a tapping agent in the uncoiling layer 3, respectively putting materials contained in the self-adhesive layer 1, the middle layer 2 and the uncoiling layer 3 into corresponding material suction barrels of the multilayer co-extrusion casting machine, and conveying the materials into an extruder hopper of the casting machine through the vacuum negative pressure of the casting machine to plasticize the materials into a melt;
s2, extruding the melt in the step S1 through a screw of an extruder, filtering through a filter, distributing to a die head through a distributor, and cooling through a casting roller and a cooling roller in sequence to form a solid film;
and S3, drawing the solid film in the step S2 by a drawing roller of a casting machine, sequentially processing the solid film by a thickness measuring device and a qualitative device of the casting machine, winding the solid film into a mother roll, performing aging treatment on the mother roll, and cutting to obtain the self-adhesive protective film.
Comparative example 1
The self-adhesive protective film of the liquid crystal backlight light guide plate produced by Dongli in Japan is L252/6.
When the self-adhesive layer particles of the protective film are selected, the stability of the adhesive force of the particles is poor, the particles fluctuate greatly along with the temperature, small molecular precipitates exist, the length-diameter ratio of an adopted extruder is not proper, the extruder does not have an accurate temperature control system, the temperature fluctuates, a casting roller is a mirror roller, the unwinding force of a finished film is poor, and an annealing device of a qualitative device is not arranged.
Examples 1-3 and comparative example 1 were subjected to performance tests, the results of which are shown in table 1 below:
TABLE 1
Figure BDA0002808075110000061
Figure BDA0002808075110000071
1. As can be seen from Table 1 above, the holding power of the protective films obtained in examples 1 to 3 were respectively: 28.7, 33.2 and 26.8, and the replying adhesion force is respectively as follows: 28.2, 32.7 and 27.1, the adhesive force is smaller than the initial adhesive force of each example, while the adhesive force of the protective film prepared in the comparative example 1 is 20.3, the adhesive force of the protective film prepared in the comparative example is 15.3, and the adhesive force is larger than the initial adhesive force (33.2), namely, compared with the prior art, the protective film prepared in the invention is easy to be attached again and has stable adhesive force.
2. As can be seen from Table 1, the protective films obtained in examples 1 to 3 had no adhesive residue and no precipitates, whereas the protective film obtained in comparative example 1 had the problem that adhesive residue and precipitates of small molecules were generated on the surface of the light guide plate after peeling, which was not favorable for the use and light emission of the light guide plate.
3. The tensile strength and elongation at break of the protective films prepared in examples 1 to 3 were higher than those of the protective film prepared in comparative example 1, i.e., the protective films had good adhesion and thermal stability, and could protect the light guide plate well during processing, transportation, etc.
It should be understood by those skilled in the art that the foregoing is only illustrative of several embodiments of the invention, and not of all embodiments. It should be noted that many variations and modifications are possible to those skilled in the art, and all variations and modifications that do not depart from the gist of the invention are intended to be within the scope of the invention as defined in the appended claims.

Claims (10)

1. The self-adhesive protective film for the liquid crystal backlight light guide plate is characterized by comprising a self-adhesive layer (1), an intermediate layer (2) and a uncoiling layer (3) which are sequentially connected; the self-adhesive layer (1) comprises 70-80 parts by mass of low-density polyethylene and 20-30 parts by mass of soft rubber resin, the middle layer (2) comprises 40-60 parts by mass of low-density polypropylene and 40-60 parts by mass of high-density polyethylene, and the unwinding layer (3) comprises 40-55 parts by mass of block copolymer polypropylene, 40-55 parts by mass of low-density polyethylene and 2-5 parts by mass of a shedding agent.
2. The self-adhesive protective film for the light guide plate of the liquid crystal backlight according to claim 1, wherein the self-adhesive layer (1) comprises 75 parts by mass of low density polyethylene and 25 parts by mass of soft rubber resin; the middle layer (2) comprises 50 parts by mass of low-density polypropylene and 50 parts by mass of high-density polyethylene, and the uncoiling layer (3) comprises 50 parts by mass of block copolymer polypropylene, 50 parts by mass of low-density polyethylene and 2 parts by mass of a shedding agent.
3. The self-adhesive protective film for the light guide plate of the liquid crystal backlight according to claim 1, wherein the low-density polyethylene of the self-adhesive layer (1) and the low-density polyethylene of the unwound layer (3) are both LF580 manufactured by japan polyethylene corporation, and the soft rubber resin of the self-adhesive layer (1) is G1657 manufactured by kraton polymer corporation; the low-density polyethylene of the middle layer (2) is 150BW produced by Exxon Mobil, and the high-density polyethylene of the middle layer (2) is HTA-108 produced by Exxon Mobil; the block copolymerization polypropylene of the unwinding layer (3) is BF308 produced by Korea Korean Huadada chemical industry, and the opening agent of the unwinding layer (3) is TC003F produced by Zhejiang UvKa new material company.
4. The production method of the self-adhesive protective film for the light guide plate of the liquid crystal backlight source as claimed in any one of claims 1 to 3, wherein the production method comprises the following steps:
s1, respectively putting the materials contained in the self-adhesive layer (1), the middle layer (2) and the uncoiling layer (3) into corresponding material suction barrels of the multilayer co-extrusion casting machine according to the component proportion requirements, and conveying the materials into an extruder hopper of the casting machine through the vacuum negative pressure of the casting machine to plasticize the materials into a melt;
s2, extruding the melt in the step S1 through a screw of an extruder, filtering through a filter, distributing to a die head through a distributor, and cooling through a casting roller and a cooling roller in sequence to form a solid film;
and S3, drawing the solid film in the step S2 by a drawing roller of a casting machine, sequentially processing the solid film by a thickness measuring device and a qualitative device of the casting machine, winding the solid film into a mother roll, performing aging treatment on the mother roll, and cutting to obtain the self-adhesive protective film.
5. The method for producing the self-adhesive protective film for the light guide plate of the liquid crystal backlight source according to claim 4, wherein the temperature of the extruder cylinder of the self-adhesive layer (1) in the step S1 is 210 ℃, 225 ℃, 230 ℃, 230 ℃, 230 ℃ and 230 ℃ respectively; the temperatures of the extruder barrels of the middle layer (2) are respectively 90 ℃, 200 ℃, 220 ℃, 225 ℃, 225 ℃, 225 ℃, 225 ℃ and 225 ℃; the temperatures of the extruder barrels of the unwound layer (3) were 215 ℃, 225 ℃, 230 ℃, 230 ℃, 230 ℃ and 230 ℃, respectively.
6. The method for producing the self-adhesive protective film of the light guide plate of the liquid crystal backlight source according to claim 4, wherein the length-to-diameter ratio L/D of the screw of the extruder used in the step S2 is not less than 34; in S2, the casting roll was subjected to the matte treatment, and the surface roughness of the casting roll was 0.45.
7. The method for producing the self-adhesive protective film of the light guide plate of the liquid crystal backlight source as claimed in claim 4, wherein the filtering step S2 is to filter the melt by a common mat-type welding filter screen and a "one-type" disc-type long-acting filter, and the mat-type welding filter screen has a 100/200/400/600/100/20-mesh structure.
8. The method for producing the self-adhesive protective film of the light guide plate of the liquid crystal backlight source according to claim 4, wherein the thickness measuring device in the step S3 automatically measures the thickness, displays the thickness, and feeds the thickness back to a thermal expansion screw of a die head, and the gap is adjusted by an automatic die head, wherein the die head is a clothes hanger type die head.
9. The method for producing the self-adhesive protective film of the light guide plate of the liquid crystal backlight source as claimed in claim 4, wherein the temperatures of the qualitative device processing in the step S3 are set to 75 ℃, 75 ℃, 65 ℃, 65 ℃, 55 ℃ and 40 ℃.
10. The method for producing the self-adhesive protective film of the light guide plate of the liquid crystal backlight source according to claim 4, wherein the temperature of the aging treatment in S3 is 45 ℃, the humidity is 60%, and the aging time is 36 hours.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008246947A (en) * 2007-03-30 2008-10-16 Dic Corp Surface protective film
US20110039069A1 (en) * 2008-04-30 2011-02-17 Toyo Boseki Kabushiki Kaisha Self-adhesive film
CN109605885A (en) * 2018-11-15 2019-04-12 永新股份（黄山）包装有限公司 A kind of optical glass self-adhesive protective film and its production method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008246947A (en) * 2007-03-30 2008-10-16 Dic Corp Surface protective film
US20110039069A1 (en) * 2008-04-30 2011-02-17 Toyo Boseki Kabushiki Kaisha Self-adhesive film
CN109605885A (en) * 2018-11-15 2019-04-12 永新股份（黄山）包装有限公司 A kind of optical glass self-adhesive protective film and its production method

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