Production process of UV polaroid and polaroid

Abstract

The invention discloses a production process of a UV polaroid and the polaroid, and the production process comprises the following steps: S1, coating the surfaces of the two sides of a polarized sub-membrane with ultraviolet curing glue, and carrying out micropore coating during coating to obtain a glued polarized sub-membrane; s2, protective films are compounded on the surfaces of the two sides of the glued polarized photonic film, then ultraviolet light irradiation is immediately used for curing the ultraviolet curing glue, heat preservation treatment is carried out for 5-10 s at the temperature of 70-90 DEG C, and a polarized layer is obtained; s3, a release film is compounded on the lower surface of the polarizing layer, a protective film is compounded on the upper surface of the polarizing layer, and the polaroid is obtained.The polaroid manufacturing method overcomes the defects in the prior art, the production period is effectively shortened, the warehouse pressure is relieved, and the production cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of polarizer production, and in particular to a production process of a UV polarizer and a polarizer. Background Art

[0002] The traditional production process of polarizers uses water-based glue (PVA glue) to compound the protective film and the polarizer film. After compounding, in order to achieve the required composite strength, the polarizer needs to be insulated. The insulation treatment generally takes 3-5 days, occupies a large amount of warehouse space, and increases production costs, which is not conducive to rapid delivery. Therefore, it is necessary to replace the water-based glue and develop a production method suitable for the new process. Summary of the invention

[0003] The purpose of the present invention is to provide a production process of a UV polarizer and a polarizer, which overcomes the shortcomings of the prior art.

[0004] To solve the above problems, the technical solutions adopted by the present invention are as follows:

[0005] A production process of a UV polarizer, comprising the following steps:

[0006] S1, coating the two sides of the polarizer film with UV curing glue, using microporous coating to obtain a coated polarizer film;

[0007] S2, compounding protective films on both sides of the coated polarizing film, and then immediately using ultraviolet light to cure the ultraviolet curing glue, and heat-treating at 70°C-90°C for 5s-10s to obtain a polarizing layer;

[0008] S3, compounding a release film on the lower surface of the polarizing layer, and compounding a protective film on the upper surface of the polarizing layer, so as to obtain a polarizer.

[0009] In step S1, the polarizing film is subjected to surface treatment before the UV curing glue is applied on the surface. The surface treatment uses an interface agent, and the amount of the interface agent sprayed is 50 mL / m 2 -80mL / m 2 The interface agent is a mixture of trihydroxymethylpropane trimethylpropylene and diethylene glycol divinyl ether in a volume ratio of 1:1-2.

[0010] Wherein, in step S1, the thickness of the UV-curing glue coated on the surface of the polarizing film is 3um-6um.

[0011] Wherein, in step S2, the glue-coated polarizing film also includes a preheating step before the composite protective film, and the preheating temperature is 50° C.-70° C. and the time is 5s-10s.

[0012] The protective film in step S2 needs to be surface treated before being compounded with the polarizing film, and the surface treatment step includes sequentially performing surface plasma treatment and surface dust removal treatment.

[0013] In addition, the present invention also provides a polarizer prepared by the above production process.

[0014] Compared with the prior art, the implementation effects of the present invention are as follows:

[0015] 1. The present invention uses ultraviolet curing glue instead of traditional water glue to compound the polarizing film and the protective film, which does not require a long heat preservation reaction time, effectively shortens the production cycle, reduces warehouse pressure, and saves production costs.

[0016] 2. The present invention improves the bonding strength between the UV-curing glue and the protective film by plasma treatment of the protective film, thereby improving the durability of the polarizing film.

[0017] 3. The present invention uses an interface agent to perform surface treatment on the polarizer film, thereby effectively solving defects such as white spots after the polarizer is compounded and improving the yield of the product; and by preheating the coated polarizer film after coating with UV-curing glue and heat-insulating the UV-curing glue after curing, the problem of composite stripes in the polarizing layer is effectively solved. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The polyvinyl alcohol film was subjected to swelling treatment, the swelling liquid of the swelling treatment was water at 28°C, the swelling time was 76s, and the polyvinyl alcohol film was stretched during the swelling process, with a stretching ratio of 1.6 times; then, a dyeing treatment was performed, and a dye containing 3.4wt% KI and 1 2 The temperature of the aqueous solution during the primary dyeing process is 32°C, the primary dyeing time is 100s, and the stretching ratio of the polyvinyl alcohol film during the primary dyeing is 1.4 times; then, the polyvinyl alcohol film after the primary dyeing is subjected to a secondary dyeing treatment, and the secondary dyeing uses a H 3 BO 3 0.5wt%, KI 4.2wt% and I 2The temperature of the aqueous solution during the secondary dyeing process was 38°C, the secondary dyeing time was 32s, and the stretching ratio of the polyvinyl alcohol film during the secondary dyeing was 1.05 times; after the secondary dyeing, the film was stretched using a stretching agent containing H 3 BO 3 The film was treated with an aqueous solution containing 0.5wt% KI and 4.3wt% KI. The solution temperature was 60℃, the extension time was 75s, and the extension ratio was 2.4 times. After the extension treatment, the film was washed with water at a temperature of 20℃ for 4s. Then, the washed polyvinyl alcohol film was treated with water containing H 3 BO 3 The color correction treatment is carried out with an aqueous solution containing 1.2wt% and 5.5wt% KI. The temperature of the solution during the color correction is 27°C and the color correction time is 3s. Finally, the color-corrected polyvinyl alcohol film is introduced into a preheating chamber at a temperature of 45°C for preheating treatment. The preheating time is 80s. After the preheating treatment, the polyvinyl alcohol film 1 enters an oven at a temperature of 80°C for drying. The drying time is 24s to achieve drying of the moisture on the surface of the polyvinyl alcohol film, thereby obtaining a polarizer film for producing polarizers.

[0020] Example 1

[0021] The surfaces of both sides of the polarizer film are coated with ultraviolet curing glue with a thickness of 6um, and microporous coating is used during coating to obtain a coated polarizer film; the protective film to be composited is surface treated, and the surface treatment uses plasma treatment, and dust removal treatment is performed after the plasma treatment; then the protective film after the surface treatment is composited on the surfaces of both sides of the coated polarizer film, and then ultraviolet (UV) light is immediately used to cure the ultraviolet curing glue. After ultraviolet light curing, heat preservation treatment is performed at 90°C for 10s to obtain a polarizing layer; finally, a release film is composited on the lower surface of the polarizing layer, and a protective film is composited on the upper surface of the polarizing layer to obtain a polarizer.

[0022] Example 2

[0023] The surfaces of both sides of the polarizer film are treated with an interface agent, and the amount of the interface agent sprayed is 80mL / m 2, the interfacial agent is a mixture of trimethylolpropane trimethylpropylene and diethylene glycol divinyl ether in a volume ratio of 1:1. Then, a UV-curable glue with a thickness of 5um is coated on both sides of the polarizer film, and microporous coating is used during coating to obtain a coated polarizer film; the protective film to be composited is surface treated, and the surface treatment is plasma treated, and dust removal is performed after plasma treatment; then, the surface treated protective film is composited on both sides of the coated polarizer film, and then UV light is immediately used to cure the UV-curable glue. After UV light curing, it is heat-treated at 80°C for 8s to obtain a polarizing layer; finally, a release film is composited on the lower surface of the polarizing layer, and a protective film is composited on the upper surface of the polarizing layer to obtain a polarizer.

[0024] Example 3

[0025] The surfaces of both sides of the polarizer film are treated with an interface agent, and the amount of the interface agent sprayed is 70mL / m 2 , the interfacial agent is a mixture of trimethylolpropane trimethylpropylene and diethylene glycol divinyl ether in a volume ratio of 1:1.5. Then, a UV-curable glue with a thickness of 4um is coated on both sides of the polarizer film, and microporous coating is used during coating to obtain a coated polarizer film; the protective film to be composited is surface treated, and the surface treatment is plasma treated, and dust removal is performed after plasma treatment; then the coated polarizer film is preheated, and the preheating temperature is 50°C and the time is 10s, and the surface treated protective film is composited on both sides of the heat treatment, and then UV light is immediately used to cure the UV-curable glue. After UV light curing, it is heat-insulated at 70°C for 6s to obtain a polarizing layer; finally, a release film is composited on the lower surface of the polarizing layer, and a protective film is composited on the upper surface of the polarizing layer to obtain a polarizer.

[0026] Example 4

[0027] The surfaces of both sides of the polarizer film are treated with an interface agent, and the amount of the interface agent sprayed is 60mL / m 2, the interfacial agent is a mixture of trimethylolpropane trimethylpropylene and diethylene glycol divinyl ether in a volume ratio of 1:2. Then, a UV-curable glue with a thickness of 5um is coated on both sides of the polarizer film, and microporous coating is used during coating to obtain a coated polarizer film; the protective film to be composited is surface treated, and the surface treatment is plasma treated, and dust removal is performed after plasma treatment; then the coated polarizer film is preheated, and the preheating temperature is 70°C for 5s, and the surface treated protective film is composited on both sides of the heat-treated surface, and then UV light is immediately used to cure the UV-curable glue. After UV light curing, it is heat-treated at 80°C for 7s to obtain a polarizing layer; finally, a release film is composited on the lower surface of the polarizing layer, and a protective film is composited on the upper surface of the polarizing layer to obtain a polarizer.

[0028] Example 5

[0029] The surfaces of both sides of the polarizing film are treated with an interface agent, and the amount of the interface agent sprayed is 50mL / m 2 , the interfacial agent is a mixture of trimethylolpropane trimethylpropylene and diethylene glycol divinyl ether in a volume ratio of 1:1.3. Then, a UV-curable glue with a thickness of 3um is coated on both sides of the polarizer film, and microporous coating is used during coating to obtain a coated polarizer film; the protective film to be composited is surface treated, and the surface treatment is plasma treated, and dust removal is performed after plasma treatment; then the coated polarizer film is preheated, and the preheating temperature is 60°C and the time is 7s, and the surface treated protective film is composited on both sides of the heat treatment, and then UV light is immediately used to cure the UV-curable glue. After UV light curing, it is heat-treated at 75°C for 5s to obtain a polarizing layer; finally, a release film is composited on the lower surface of the polarizing layer, and a protective film is composited on the upper surface of the polarizing layer to obtain a polarizer.

[0030] Example 6

[0031] The surfaces of both sides of the polarizer film are treated with an interface agent, and the amount of the interface agent sprayed is 65mL / m 2, the interfacial agent is a mixture of trimethylolpropane trimethylpropylene and diethylene glycol divinyl ether in a volume ratio of 1:1.7. Then, a UV-curable glue with a thickness of 4um is coated on both sides of the polarizer film, and microporous coating is used during coating to obtain a coated polarizer film; the protective film to be composited is surface treated, and the surface treatment is plasma treated, and dust removal is performed after plasma treatment; then the coated polarizer film is preheated, and the preheating temperature is 60°C and the time is 6s, and the surface treated protective film is composited on both sides of the heat treatment, and then UV light is immediately used to cure the UV-curable glue. After UV light curing, it is heat-treated at 85°C for 5s to obtain a polarizing layer; finally, a release film is composited on the lower surface of the polarizing layer, and a protective film is composited on the upper surface of the polarizing layer to obtain a polarizer.

[0032] Comparative Example 1

[0033] The difference from Example 1 is that the protective film is not subjected to plasma treatment.

[0034] Comparative Example 2

[0035] The difference from Example 1 is that after UV curing, the polarizing layer is obtained by treating at room temperature for 10 seconds.

[0036] The polarizing layers in Examples 1-6 and the comparative example were tested for stripes and defects. Five samples were taken for each sample, and the sample size was 610 mm*460 mm. During the test, the polarizing layer was directly placed on the white light LED light source, and the defects on the polarizing layer were observed. The stripe conditions and the total number of defects were recorded. The stripe condition was recorded with the most serious result. The results are shown in the following table:

[0037] Composite stripes <![CDATA[Bubble point (pcs / m 2 )]]> <![CDATA[Bright fragment (pcs / m 2 )]]> Example 1 There are not obvious stripes 8 4 Example 2 There are not obvious stripes 3 2 Example 3 No streaks 3 2 Example 4 No streaks 1 1 Example 5 No streaks 2 1 Example 6 No streaks 2 2 Comparative Example 1 There are obvious stripes 12 7 Comparative Example 2 There are obvious stripes 14 6

[0038] It can be seen that the present invention uses UV curing glue to improve the existing production process, and effectively solves the problems of severe composite stripes and many point defects by treating the protective film and heat-insulating treatment after curing; at the same time, the present invention eliminates composite stripes and greatly reduces the defective rate of point defects by using an interface agent and preheating treatment, thereby improving the quality of the product.

[0039] It should also be noted that the plasma treatment conditions for the protective film of the present invention are: gap 2.3 mm, nitrogen-oxygen ratio direct plasma 3:1, indirect plasma 300:1, power 2.8 KW.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A production process for a UV polarizer, characterized in that: The following steps are involved: S1, coating the surfaces of both sides of the polarizer film with UV-curable glue to obtain a coated polarizer film; S2, compounding protective films on both sides of the coated polarizing film, and then immediately using ultraviolet light to cure the ultraviolet curing glue, and heat-treating at 70°C-90°C for 5s-10s to obtain a polarizing layer; S3, compounding a release film on the lower surface of the polarizing layer, and compounding a protective film on the upper surface of the polarizing layer, so as to obtain a polarizer.

2. The production process of a UV polarizer according to claim 1, characterized in that: In step S1, the polarizing film is subjected to surface treatment before the UV curing glue is coated on the surface, and the surface treatment uses an interface agent.

3. The production process of a UV polarizer according to claim 1, characterized in that: In step S1, the thickness of the UV-curable glue coated on the surface of the polarizing film is 3um-6um.

4. The production process of a UV polarizer according to claim 1, characterized in that: In step S2, the glue-coated polarizing film also includes a preheating step before being combined with the protective film. The preheating temperature is 50° C.-70° C. and the time is 5s-10s.

5. The production process of a UV polarizer according to claim 1, characterized in that: The protective film in step S2 needs to be surface treated before being compounded with the polarizing film. The surface treatment step includes sequentially performing surface plasma treatment and surface dust removal treatment.

6. A polarizer, characterized in that: The invention is prepared by the production process described in any one of claims 1 to 5.