1. An ultraviolet-proof splicing adhesive tape is characterized by comprising a use layer, a protective film attached to the use layer and a fluoroplastic release film attached below the use layer; the use layer comprises: the ultraviolet-proof pressure-sensitive adhesive comprises a first base film, a back forming structure formed on the back of the first base film and ultraviolet-proof pressure-sensitive adhesive coated on the front of the first base film; the protective film ultraviolet-proof pressure-sensitive adhesive comprises: a colloid, ultraviolet absorbing microcapsules fused in the colloid; the colloid comprises the following components in parts by weight: 25-35 parts of acrylic resin monomers; 55-70 parts of ethyl acetate; 1-2 parts of isocyanate curing agent; the microcapsule comprises the following wall materials in parts by weight: 3-9 parts of polypropylene, 6-12 parts of acrylic resin monomer and 3-6 parts of free radical trapping agent; the core material of the microcapsule is 8-16 parts by weight of ultraviolet resistant agent.

2. The ultraviolet-proof splicing tape as claimed in claim 1, wherein the acrylic resin monomers are: one or more of methyl methacrylate, methacrylic acid, ethyl methacrylate, butyl methacrylate, amyl methacrylate, beta-hydroxypropyl methacrylate, ethyl acrylate, butyl acrylate or beta-hydroxypropyl acrylate.

3. The ultraviolet-proof splicing adhesive tape as claimed in claim 1, wherein the isocyanate curing agent is: one or more of hexamethylene polyisocyanate, isophorone diisocyanate, toluene diisocyanate, or triglycidyl isocyanurate.

4. The UV-blocking splicing tape according to claim 1, wherein said radical scavenger is a phosphite.

5. The ultraviolet-proof splicing tape as claimed in claim 1, wherein the ultraviolet-proof agent is one or more of benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers, salicylate ultraviolet absorbers, triazine ultraviolet absorbers and substituted acrylonitrile ultraviolet absorbers.

6. The preparation method of the ultraviolet-proof splicing adhesive tape is characterized by comprising the following steps of:

step one, preparing a back molding structure on the back of a first base film by adopting a resin material in a soft molding mode;

secondly, attaching a protective film before rolling to obtain a semi-finished product;

step three, coating the semi-finished product on a coating machine by using a micro-concave coating mode to coat an ultraviolet-proof pressure-sensitive adhesive, drying, UV curing, attaching the semi-finished product to a fluoroplastic release film, and rolling to obtain a finished product coiled material adhesive tape;

the preparation process of the ultraviolet-proof pressure-sensitive adhesive comprises the following steps:

step a, preparing raw materials, wherein the colloid raw materials comprise the following components in parts by weight: 25-35 parts of acrylic resin monomers; 55-70 parts of ethyl acetate; 1-2 parts of isocyanate curing agent; the microcapsule comprises the following wall material raw materials in parts by weight: 3-9 parts of polypropylene, 6-12 parts of acrylic resin monomer and 3-6 parts of free radical trapping agent; the core material of the microcapsule is 8-16 parts of ultraviolet resistant agent;

step b, preparing microcapsule wall material aqueous solution: adding polypropylene and acrylic resin monomers of microcapsule wall material raw materials into deionized water at 60-90 ℃, starting a stirrer, stirring at constant temperature of 40-80 ℃ for 4-8h, and filtering insoluble substances to obtain a transparent microcapsule wall material aqueous solution;

step c, adding the core material ultraviolet-resistant agent of the microcapsule into the microcapsule wall material aqueous solution, treating for 20-30min by adopting a high-speed shearing emulsifying machine, heating to 40-80 ℃, and reacting for 2h at constant temperature to obtain the ultraviolet-resistant microcapsule;

d, adding the colloid raw materials of acrylic resin monomers, ethyl acetate and isocyanate curing agents into a high-speed shearing emulsifying machine, continuously heating to 40-80 ℃, reacting at constant temperature for 6-10h, and cooling to room temperature to obtain the ultraviolet-proof pressure-sensitive adhesive;

and step four, slitting the finished coiled material adhesive tape to obtain the ultraviolet-proof splicing adhesive tape.

7. The method as claimed in claim 6, wherein the rotation speed of the high speed shearing emulsifying machine is 10000-.

8. The preparation method of the ultraviolet-proof splicing adhesive tape as claimed in claim 6, wherein in the third step, the method for drying the ultraviolet-proof pressure-sensitive adhesive comprises the following steps: drying in a 110 ℃ oven for 10 min.

9. The preparation method of the ultraviolet-proof splicing tape as claimed in claim 6, wherein in the third step, the method for UV curing the ultraviolet-proof pressure-sensitive adhesive comprises the following steps: the wavelength of the UV light is 300-400nm, the curing time is 40-60s, and the dose of the UV radiation is 50-110mJ/cm 2.

Background

The production of the brightness enhancement film by soft forming needs template splicing and needs splicing adhesive tapes. Considering the characteristics of the soft forming process and the mass production, the splicing tape is required to be used for winding a whole roll (about 1000-. The currently used adhesive tape is a single-sided UV-resistant adhesive tape, the front side of the currently used adhesive tape is a pressure-sensitive adhesive, the back side of the currently used adhesive tape is a fluoroplastic release layer, the viscosity is not high, and the edge of the currently used adhesive tape is easy to warp and tear after long-time use, so that the tape is shut down; although the back fluoroplastic release layer is UV-resistant and has a certain release effect, the effect is not good, the difference of the release effect on different structures or molding resins is large, the universality is not good, and the release layer is gradually taken away by the molding resins due to long-time use, so that the release effect is poor, the adhesive tape is finally lifted and torn, and the machine is stopped; in order to increase the ultraviolet resistance and aging resistance, an ultraviolet resistance additive is added into acrylic resin in the market to improve the ultraviolet resistance of the product, but the viscosity of the adhesive tape is reduced by adding too much ultraviolet resistance agent, so that the problem of shortened service life of the product cannot be solved. The market needs a splicing adhesive tape which can improve the ultraviolet resistance and has good viscosity; the present invention solves such problems.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the ultraviolet-proof splicing adhesive tape and the preparation method thereof, which have the advantages that the ultraviolet-proof performance is improved, the viscosity is good, and the service life of the adhesive tape is greatly prolonged.

In order to achieve the above object, the present invention adopts the following technical solutions:

an ultraviolet-proof splicing adhesive tape comprises a use layer, a protective film attached to the use layer, and a fluoroplastic release film attached below the use layer; the use layer comprises: the ultraviolet-proof pressure-sensitive adhesive protective film comprises a first base film, a back forming structure formed on the back of the first base film and an ultraviolet-proof pressure-sensitive adhesive protective film coated on the front of the first base film; the ultraviolet-proof pressure-sensitive adhesive comprises: a colloid, ultraviolet absorbing microcapsules fused in the colloid; the colloid comprises the following components in parts by weight: 25-35 parts of acrylic resin monomers; 55-70 parts of ethyl acetate; 1-2 parts of isocyanate curing agent; the microcapsule comprises the following wall materials in parts by weight: 3-9 parts of polypropylene, 6-12 parts of acrylic resin monomer and 3-6 parts of free radical trapping agent; the core material of the microcapsule is 8-16 parts by weight of ultraviolet resistant agent.

In the ultraviolet-proof splicing tape, the acrylic resin monomer is: one or more of methyl methacrylate, methacrylic acid, ethyl methacrylate, butyl methacrylate, amyl methacrylate, beta-hydroxypropyl methacrylate, ethyl acrylate, butyl acrylate or beta-hydroxypropyl acrylate.

In the ultraviolet-proof splicing adhesive tape, the isocyanate curing agent is: one or more of hexamethylene polyisocyanate, isophorone diisocyanate, toluene diisocyanate, or triglycidyl isocyanurate.

In the ultraviolet-proof splicing adhesive tape, the radical scavenger is a hydroperoxide decomposer. Phosphite esters

The ultraviolet-resistant agent of the ultraviolet-proof splicing adhesive tape is one or more of benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers, salicylate ultraviolet absorbers, triazine ultraviolet absorbers and substituted acrylonitrile ultraviolet absorbers.

A preparation method of an ultraviolet-proof splicing adhesive tape comprises the following steps:

step one, preparing a back molding structure on the back of a first base film by adopting a resin material in a soft molding mode;

secondly, attaching a protective film before rolling to obtain a semi-finished product;

step three, coating the semi-finished product on a coating machine by using a micro-concave coating mode to coat an ultraviolet-proof pressure-sensitive adhesive, drying, UV curing, attaching the semi-finished product to a fluoroplastic release film, and rolling to obtain a finished product coiled material adhesive tape;

the preparation process of the ultraviolet-proof pressure-sensitive adhesive comprises the following steps:

step a, preparing raw materials, wherein the colloid raw materials comprise the following components in parts by weight: 25-35 parts of acrylic resin monomers; 55-70 parts of ethyl acetate; 1-2 parts of isocyanate curing agent; the microcapsule comprises the following wall material raw materials in parts by weight: 3-9 parts of polypropylene, 6-12 parts of acrylic resin monomer and 3-6 parts of free radical trapping agent; the core material of the microcapsule is 8-16 parts of ultraviolet resistant agent;

step b, preparing microcapsule wall material aqueous solution: adding polypropylene and acrylic resin monomers of microcapsule wall material raw materials into deionized water at 60-90 ℃, starting a stirrer, stirring at constant temperature of 40-80 ℃ for 4-8h, and filtering insoluble substances to obtain a transparent microcapsule wall material aqueous solution;

step c, adding the core material ultraviolet-resistant agent of the microcapsule into the microcapsule wall material aqueous solution, treating for 20-30min by adopting a high-speed shearing emulsifying machine, heating to 40-80 ℃, and reacting for 2h at constant temperature to obtain the ultraviolet-resistant microcapsule;

and d, adding the colloid raw materials of acrylic resin monomers, ethyl acetate and isocyanate curing agents into a high-speed shearing emulsifying machine, continuously heating to 40-80 ℃, reacting at constant temperature for 6-10h, and cooling to room temperature to obtain the ultraviolet-proof pressure-sensitive adhesive.

And step four, slitting the finished coiled material adhesive tape to obtain the ultraviolet-proof splicing adhesive tape.

In the preparation method of the ultraviolet-proof splicing tape, the rotation speed of the high-speed shearing emulsifying machine is 10000-20000 r/min.

In the third step, the method for drying the ultraviolet-proof pressure-sensitive adhesive comprises the following steps: drying in a 110 ℃ oven for 10 min.

In the third step, the method for curing the ultraviolet-proof pressure-sensitive adhesive by using the UV is as follows: the wavelength of UV light is 300-400nm, the curing time is 40-60s, and the dose of UV radiation is 50-110mJ/cm²。

The invention has the advantages that:

the invention adopts microcapsule technology, avoids directly adding ultraviolet-proof agent, and has excellent ultraviolet-proof effect on the premise of ensuring no influence on viscosity;

the microcapsule wall material is compounded by polypropylene, acrylic resin monomers and phosphite ester, has a synergistic effect, can effectively and slowly release the ultraviolet-proof agent, and has a good ultraviolet-proof effect;

the back forming structure design of the invention ensures that the adhesive tape has good demoulding effect, and greatly prolongs the service life of the adhesive tape.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

The meaning of the reference symbols in the figures:

the coating comprises a using layer 1, a first base film 101, a forming structure on the back surface of the base film 102, an ultraviolet-proof pressure-sensitive adhesive layer 103, a protective film 2, a second base film 201, an acrylic pressure-sensitive adhesive or a silica gel pressure-sensitive adhesive 202, a fluoroplastic release film 3, a third base film 301 and a fluoroplastic release layer 302.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

A splicing tape comprising: the use layer 1, the protective film 2 attached to the use layer 1, and the fluoroplastic release film 3 attached to the lower part of the use layer 1.

The use layer 1 includes: the ultraviolet-proof pressure sensitive adhesive film comprises a first base film 101, a back forming structure 102 formed on the back of the first base film 101, and an ultraviolet-proof pressure sensitive adhesive layer 103 coated on the front of the first base film.

The protective film 2 is composed of a second base film 201 and an acrylic pressure-sensitive adhesive or silicone pressure-sensitive adhesive layer 202 coated under the second base film 201 and attached to the back molding structure 102.

The fluoroplastic release film 3 is composed of a third base film 301 and a fluoroplastic release layer 302 formed on the third base film 301.

The first base film 101, the second base film 201, and the third base film 301 are low shrinkage films; as an example, the low shrinkage film is PET, PC or PI, and it should be noted that: the material is not limited, and any film having a low shrinkage rate can be used in the present invention.

The backside molding structure 102 is a bump structure. As an example, the projection structure is an MD prism projection structure, and preferably, the MD prism projection structure is an MD 25pitch prism projection structure or an MD 50pitch prism projection structure; as another embodiment, the backside molding structure 102 is a hemispherical protrusion.

A preparation method of an ultraviolet-proof splicing adhesive tape comprises the following steps:

step one, preparing a back molding structure on the back of a first base film by adopting a resin material in a soft molding mode;

secondly, attaching a protective film before rolling to obtain a semi-finished product;

step three, coating the semi-finished product on a coating machine by a micro-concave coating mode to form an ultraviolet-proof pressure-sensitive adhesive, drying in a drying oven at 110 ℃ for 10min, wherein the wavelength of UV light is 300-400nm, the curing time is 40-60s, and the dose of UV radiation is 50-110mJ/cm²After UV curing, laminating the film with a fluoroplastic release film and then rolling to obtain a finished product coiled material adhesive tape;

the preparation process of the ultraviolet-proof pressure-sensitive adhesive comprises the following steps:

step a, preparing raw materials, wherein the colloid raw materials comprise the following components in parts by weight: 25-35 parts of acrylic resin monomers; 55-70 parts of ethyl acetate; 1-2 parts of isocyanate curing agent; the microcapsule comprises the following wall material raw materials in parts by weight: 3-9 parts of polypropylene, 6-12 parts of acrylic resin monomer and 3-6 parts of free radical trapping agent; the core material of the microcapsule is 8-16 parts of ultraviolet resistant agent; as an example, the acrylic resin-based monomer is: one or more of methyl methacrylate, methacrylic acid, ethyl methacrylate, butyl methacrylate, amyl methacrylate, beta-hydroxypropyl methacrylate, ethyl acrylate, butyl acrylate or beta-hydroxypropyl acrylate. The isocyanate curing agent is: one or more of hexamethylene polyisocyanate, isophorone diisocyanate, toluene diisocyanate, or triglycidyl isocyanurate. The free radical trapping agent is a hydroperoxide decomposer, preferably phosphite ester; it should be noted that: other radical scavengers are also suitable for use in the present invention. The ultraviolet resistant agent is one or more of benzophenone ultraviolet absorbent, benzotriazole ultraviolet absorbent, salicylate ultraviolet absorbent, triazine ultraviolet absorbent and substituted acrylonitrile ultraviolet absorbent.

Step b, preparing microcapsule wall material aqueous solution: adding polypropylene and acrylic resin monomers of microcapsule wall material raw materials into deionized water at 60-90 ℃, starting a stirrer, stirring at constant temperature of 40-80 ℃ for 4-8h, and filtering insoluble substances to obtain a transparent microcapsule wall material aqueous solution;

step c, adding the core material ultraviolet-resistant agent of the microcapsule into the microcapsule wall material aqueous solution, treating for 20-30min by adopting a high-speed shearing emulsifying machine, heating to 40-80 ℃, and reacting for 2h at constant temperature to obtain the ultraviolet-resistant microcapsule;

and d, adding the colloid raw materials of acrylic resin monomers, ethyl acetate and isocyanate curing agents into a high-speed shearing emulsifying machine, continuously heating to 40-80 ℃, reacting at constant temperature for 6-10h, and cooling to room temperature to obtain the ultraviolet-proof pressure-sensitive adhesive.

And step four, slitting the finished coiled material adhesive tape to obtain the ultraviolet-proof splicing adhesive tape.

The technical effects of the invention were examined as follows:

example 1:

a preparation method of an ultraviolet-proof splicing adhesive tape comprises the following steps:

step one, preparing a back molding structure on the back of a first base film by adopting a resin material in a soft molding mode;

secondly, attaching a protective film before rolling to obtain a semi-finished product;

step three, coating the semi-finished product on a coating machine by using a micro-concave coating mode to coat the ultraviolet-proof pressure-sensitive adhesive, drying in a drying oven at 110 ℃ for 10min, wherein the wavelength of UV light is 300nm, the curing time is 50s, and the dose of UV radiation is 80mJ/cm²After UV curing, laminating the film with a fluoroplastic release film and then rolling to obtain a finished product coiled material adhesive tape;

the preparation process of the ultraviolet-proof pressure-sensitive adhesive comprises the following steps:

step a, preparing raw materials, wherein the colloid raw materials comprise: 25g of methyl methacrylate; 55g of ethyl acetate; 1g of hexamethylene polyisocyanate; the wall material of the microcapsule comprises the following raw materials: 3g of polypropylene, 6g of methyl methacrylate and 3g of phosphite ester agent; the core material of the microcapsule is 8g of benzophenone ultraviolet absorbent.

Step b, preparing microcapsule wall material aqueous solution: adding polypropylene and acrylic resin monomers of microcapsule wall material raw materials into deionized water at 80 ℃, starting a stirrer, stirring at constant temperature for 80 ℃ for 8 hours, and filtering insoluble substances to obtain a transparent microcapsule wall material aqueous solution;

step c, adding the core material ultraviolet-resistant agent of the microcapsule into the microcapsule wall material aqueous solution, treating for 30min by adopting a high-speed shearing emulsifying machine, heating to 80 ℃, and reacting for 2h at constant temperature to obtain the ultraviolet-resistant microcapsule;

and d, adding the colloid raw materials of acrylic resin monomers, ethyl acetate and isocyanate curing agents into a high-speed shearing emulsifying machine, continuously heating to 80 ℃, reacting at a constant temperature for 10 hours, and cooling to room temperature to obtain the ultraviolet-proof pressure-sensitive adhesive.

And step four, slitting the finished coiled material adhesive tape to obtain the ultraviolet-proof splicing adhesive tape.

Example 2:

the colloid raw materials comprise: 30g of ethyl methacrylate; 60g of ethyl acetate; 1g of isophorone diisocyanate; the wall material of the microcapsule comprises the following raw materials: 6g of polypropylene, 9g of methyl methacrylate and 5g of phosphite ester agent; the core material of the microcapsule is 12g of benzotriazole ultraviolet absorbent; the preparation is as in example 1.

Example 3:

the colloid raw materials comprise: 35g of beta-hydroxypropyl methacrylate; 70g of ethyl acetate; 2g of toluene diisocyanate; the wall material of the microcapsule comprises the following raw materials: 9g of polypropylene, 12g of methyl methacrylate and 6g of phosphite ester agent; the core material of the microcapsule is 16g of salicylate ultraviolet absorbent.

Comparative example 1:

the colloid raw materials comprise: 30g of ethyl methacrylate; 60g of ethyl acetate; 1g of isophorone diisocyanate; the wall material of the microcapsule comprises the following raw materials: 9g of methyl methacrylate and 5g of phosphite ester agent; the core material of the microcapsule is 12g of benzotriazole ultraviolet absorbent; the preparation is as in example 1. The formulation is lacking in polypropylene compared to example 2.

Comparative example 2:

the colloid raw materials comprise: 30g of ethyl methacrylate; 60g of ethyl acetate; 1g of isophorone diisocyanate; the wall material of the microcapsule comprises the following raw materials: 6g of polypropylene and 9g of methyl methacrylate; the core material of the microcapsule is 12g of benzotriazole ultraviolet absorbent; the preparation is as in example 1. The formulation lacks phosphite agent compared to example 2.

Comparative example 3:

step three: 30g of methyl methacrylate, 60g of ethyl acetate, 1g of isophorone diisocyanate and 12g of benzotriazole ultraviolet absorbent are directly mixed to prepare the ultraviolet-proof pressure-sensitive adhesive without adopting a microcapsule technology. The rest is the same as in example 1.

Respectively detecting the peeling strength and the ultraviolet blocking rate of the sample before ultraviolet irradiation, after the sample is irradiated for 96 hours by the UV light with the wavelength of 600nm and the UV radiation dose of 120mJ/cm 2; the ultraviolet blocking rate is detected by adopting the national standard GB/T2680, and the instrument adopts a Nippon Shimadzu UV-3600 type spectrophotometer. The results are shown in Table 1.

TABLE 1 Properties of different splicing tapes

The experiments show that the microcapsule technology can improve the ultraviolet blocking rate while maintaining the viscosity, and greatly prolong the service life of the adhesive tape; the microcapsule wall material is compounded by polypropylene, acrylic resin monomers and phosphite ester, has a synergistic effect, can effectively and slowly release the ultraviolet-proof agent, and has a good ultraviolet-proof effect.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.