High-plasticity INS film and application thereof

Abstract

The invention discloses a high-plasticity I NS film and application thereof. The high-plasticity I NS film comprises a touch layer, an extinction layer, a PMMA film layer, an ink layer, a bonding layer and an ABS base material layer which are sequentially stacked from top to bottom. The matting layer is formed by printing and coating dual-curing coating resin A, and the dual-curing coating resin A is prepared from the following components in parts by weight: 80 to 120 parts of polyurethane acrylate prepolymer, 3 to 5 parts of photoinitiator, 1 to 1.5 parts of flatting agent, 0.3 to 0.7 part of defoaming agent and 3 to 7 parts of matting agent; the touch layer is formed by printing and coating dual-curing coating resin B, and the dual-curing coating resin B is prepared from the following components in parts by weight: 80 to 120 parts of polyurethane acrylate prepolymer, 3 to 5 parts of photoinitiator, 1 to 1.5 parts of flatting agent, 0.3 to 0.7 part of defoaming agent and 5 to 10 parts of touch agent. The problems that after the INS film is subjected to high-temperature stretching and plastic uptake, the wrap angle position of the INS film and the plastic part is prone to cracking, and the yield of the produced injection molding part is low are solved.

Description

Technical Field

[0001] The invention relates to the technical field of functional films, and in particular to a high-plasticity INS film and applications thereof. Background Art

[0002] Plastic is one of the main components of interior decoration, but the original texture of plastic is not popular with the public. Manufacturers will use various surface treatment processes to improve the original texture of plastic materials. Among them, INS process is currently the most commonly used plastic surface treatment process.

[0003] INS, or Film Insert Molding, uses the method of thermal blister molding or high-pressure molding to stretch the transferred film three times, then cut out the insert according to the product shape, and then accurately place the insert in the injection mold cavity for injection molding. However, most of the existing INS molds are prone to cracking at the corners of the plastic parts to be processed after high-temperature stretching and blister molding, resulting in a low yield rate of injection molded parts. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a high-plasticity INS film and its application, which avoids the problem that the INS film is easy to crack at the corner where it wraps with the plastic parts after high-temperature stretching and blister forming, resulting in low yield of the produced injection molded parts.

[0005] The technical solution of the present invention is:

[0006] A high plasticity INS film, characterized by comprising:

[0007] Matt layer, PMMA film layer, ink layer, adhesive layer and ABS substrate layer;

[0008] The matte layer is formed by printing and coating a dual-curing coating resin A; the added amounts of the components in the dual-curing coating resin A include: 80-120 parts by weight of a polyurethane acrylate prepolymer, 3-5 parts by weight of a photoinitiator, 1-1.5 parts by weight of a leveling agent, 0.3-0.7 parts by weight of a defoaming agent, and 3-7 parts by weight of a matte agent.

[0009] Furthermore, a touch layer is provided on the matte layer, and the touch layer is formed by printing and coating the dual-curing coating resin B;

[0010] The added amounts of the components in the dual-curing coating resin B include: by weight, 80-120 parts of polyurethane acrylate prepolymer, 3-5 parts of photoinitiator, 1-1.5 parts of leveling agent, 0.3-0.7 parts of defoaming agent and 5-10 parts of touch agent.

[0011] Furthermore, the photoinitiator is one or more of 2-hydroxy-2-methyl-1-phenyl-1-propanone and 1-hydroxycyclohexyl phenyl ketone.

[0012] Furthermore, the leveling agent is silicone acrylate.

[0013] Furthermore, the defoaming agent is a polyether siloxane copolymer.

[0014] Furthermore, the touch agent is one or more of ethylene terephthalate powder and polymethyl methacrylate powder.

[0015] Furthermore, the matting agent is one or more of silicon dioxide and titanium dioxide.

[0016] Furthermore, the polyurethane acrylate prepolymer is formed by reacting a polyether diol and a difunctional isocyanate compound to form an isocyanate-terminated first polyurethane prepolymer, then reacting an epoxy alcohol compound with the first polyurethane prepolymer to form an epoxy-terminated second modified polyurethane prepolymer, and finally reacting an acrylic compound with the second modified polyurethane prepolymer to form an unsaturated bond-terminated second modified polyurethane prepolymer.

[0017] Furthermore, the polyether diol is polyethylene glycol.

[0018] Furthermore, the bifunctional isocyanate compound is hexamethylene diisocyanate (HDI).

[0019] Furthermore, the epoxy alcohol compound is glycidol.

[0020] Furthermore, the acrylic compound is methacrylic acid.

[0021] Furthermore, the molecular weight of the polyurethane acrylate prepolymer is Mn=8000-12000.

[0022] The high plasticity INS film of the present invention can be applied to the surface treatment process of plastic products.

[0023] Specifically, the high plasticity INS film is first stretched three times, cut, and placed in a mold, and then the plastic product is injection molded into the mold. After demolding, the product is placed in a UV curing box for ultraviolet light curing, and the light intensity is 600mj / cm 2 , illumination time 4s-10s.

[0024] The beneficial technical effects of the present invention are:

[0025] The invention provides a high-plasticity INS film, which comprises: a matte layer, a touch layer, a PMMA film layer, an ink layer, a bonding layer and an ABS substrate layer which are stacked in sequence from top to bottom.

[0026] The matte layer is formed by printing and coating dual-curing coating resin A, and the touch layer is formed by printing and coating dual-curing coating resin B. Since both dual-curing coating resin A and dual-curing coating resin B contain polyurethane acrylate prepolymer and photoinitiator, the matte layer and touch layer of the INS film of the present invention are formed in two steps. The first step of film formation is that during the preparation process of the INS film, the polyurethane acrylate prepolymer in the matte layer and the touch layer is preliminarily thermally filmed respectively, so that the two coatings each have certain mechanical properties and good tensile properties. Thereafter, the INS film is applied to the plastic surface treatment process by high-temperature vacuum forming and injection molding. Therefore, compared with the INS film of the prior art, the INS of the present invention well avoids the problem that it is easy to crack at the corner position with the plastic part after high-temperature stretching vacuum forming; after the INS film is demoulded from the plastic part, the INS film on the plastic part is cured and filmed for the second time under UV light, that is, light curing and filming, so that the overall performance of the matte layer and the touch layer is further improved, and the use strength of the plastic part is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a finished product picture of Example 1 INS film applied to a plastic surface;

[0028] Figure 2 This is a picture of the finished product of Comparative Example 1 INS film applied to a plastic surface. DETAILED DESCRIPTION

[0029] In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0030] The reagents used in the present invention are all commercially available reagents, including 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173), silicone acrylate (TEGO Rad2700), polyether siloxane copolymer (TEGO Airex902W), silicon dioxide (Evonik, OK520), polymethyl methacrylate powder (15nm), hydroxy acrylic resin (Changxing, 6233), and polyethylene glycol with a molecular weight of Mn=1000.

[0031] Example 1

[0032] like Figure 1 As shown, the present invention provides a high plasticity INS film, comprising: a touch layer, a matte layer, a PMMA film layer, an ink layer, a bonding layer and an ABS substrate layer stacked in sequence from top to bottom.

[0033] Among them, the touch layer is printed and coated with dual-cured coating resin B, the matte layer is printed and coated with dual-cured coating resin A, the PMMA film layer is made of PMMA material, the bonding layer is an adhesive coating, which is used to connect the PMMA film layer and the ABS substrate layer together. The bonding layer used in the present invention is a polyurethane glue material; the ABS substrate layer is made of ABS material, which is used to be fused with the component material during injection molding.

[0034] The dual-cure coating resin A comprises, by weight, 100 parts of polyurethane acrylate prepolymer, 5 parts of photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1 part of leveling agent silicone acrylate, 0.5 parts of defoaming agent polyether siloxane copolymer and 5 parts of matting agent silica, which are mixed and stirred uniformly to obtain.

[0035] The dual-cure coating resin B includes, by weight, 100 parts of polyurethane acrylate prepolymer, 5 parts of photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1 part of leveling agent silicone acrylate, 0.5 parts of defoaming agent polyether siloxane copolymer and 5 parts of touch agent polymethyl methacrylate powder, which are mixed and stirred evenly.

[0036] The preparation process of the above-mentioned polyurethane acrylate prepolymer is as follows:

[0037] Dehydrate the polyethylene glycol under vacuum until the water content is less than 0.05%, add the polyethylene glycol to butyl acetate, stir, and heat to 70-75°C; and under stirring, add HDI and catalyst dibenzothiophene (DBT) dropwise, both of which are added dropwise within 30 minutes, heat to 80-85°C, and keep warm for 3 hours; determine the NCO value, and after reaching 50% of the theoretical value, the first polyurethane prepolymer terminated with isocyanate is obtained; reduce the temperature to 40-45°C, add glycidol dropwise, and then react at 70-75°C until the NCO value is 0, so as to obtain the second modified polyurethane prepolymer terminated with epoxy group; add MAA (methacrylic acid) and inhibitor hydroquinone dropwise, keep warm and continue to react for 2 hours, and the titrated acid value is less than 6mg KOH / g, and the reaction is terminated. Thus, the polyurethane acrylate prepolymer terminated with methacrylate is obtained. The molar ratio of HDI to polyethylene glycol is 2:1, the molar ratio of the first polyurethane prepolymer to glycidol is 1:1, the molar ratio of the epoxy group of the second modified polyurethane prepolymer to MAA is 1:1, and the molecular weight of the polyurethane acrylate prepolymer is Mn=8000-12000.

[0038] Further, the solid content of the polyurethane acrylate prepolymer is tested, and the prepolymer is diluted with an organic solvent to a coating thickness suitable for construction. In the present invention, the solid content of the polyurethane acrylate prepolymer is 25%, and the organic solvent used for dilution is, by volume ratio of butanone:ethyl acetate:butyl acetate=3:3:4.

[0039] The preparation process of the INS membrane of the present invention is as follows:

[0040] S1, using a gravure printing automatic precision coating machine, printing a pattern and ink on the lower side of the PMMA film layer to form an ink layer;

[0041] S2, printing the dual-curing coating resin B on the upper side of the PMMA film layer through a tumbling rack to form a matte layer; printing the dual-curing coating resin A on the upper side of the matte layer through a tumbling rack to form a touch layer, and then baking in an oven at 120° C. for 2 minutes to make the matte layer and the touch layer surface dry and initially thermally film-formed, respectively, so that the two coatings have certain mechanical properties, thereby forming a basic film material 1;

[0042] S3, using a high-precision coating and laminating machine, unwinding the ABS substrate layer through its No. 1 unwinding reel, applying polyurethane glue on the upper side of the ABS substrate layer by rolling to form a bonding layer, and then drying the polyurethane glue in an oven at 80° C., thereby forming a base film material 1;

[0043] S4, unwind the above-mentioned base film material through the No. 2 unwinding machine of the high-precision coating and laminating machine, and laminate the base film material 1 and the base film material 2 together through a laminating roller at 100° C. and a pressure of 0.3 Pa to produce the finished roll INS film of Example 1.

[0044] The matte layer of the present invention has a thickness of about 6 μm, the touch layer has a thickness of about 8 μm, the PMMA film layer has a thickness of about 100 μm, and the ABS substrate layer has a thickness of about 400 μm.

[0045] The INS film of the present invention is applied to the surface treatment process of plastic products, and the specific application steps are as follows:

[0046] The INS film of the present invention is first stretched three times, cut, and placed in a film mold; then plastic is injection molded into the mold; demolded and taken out, and finally placed in a UV curing box at a light intensity of 600mj / cm 2 , and irradiate with light for 5s to complete the surface treatment of the INS film on the plastic product.

[0047] The photoinitiator in the dual-cure coating resin A and the dual-cure coating resin B with photo-solid system function in the matte layer and the touch layer absorbs ultraviolet radiation energy and is activated, and produces an active center in a very short time. Then the active center reacts with the unsaturated group in the polyurethane acrylate prepolymer in the dual-cure coating resin A and the dual-cure coating resin B, triggering the disconnection of the double bonds in the polyurethane acrylate prepolymer, and a continuous polymerization reaction occurs, thereby cross-linking with each other to form a film, that is, after the matte layer and the touch layer are cured by ultraviolet light, they are further cross-linked to form a film, thereby further optimizing the overall performance of the INS film.

[0048] Example 2

[0049] The INS film of Example 2 has the same structure as the INS film of Example 1, except that the content of each component in the touch layer and the matte layer of Example 2 is different from that in Example 1, as follows:

[0050] The dual-cure coating resin B of the touch layer of Example 2 is obtained by mixing and stirring, in parts by weight, 80 parts of polyurethane acrylate prepolymer, 3 parts of photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1.2 parts of leveling agent silicone acrylate, 0.3 parts of defoaming agent polyether siloxane copolymer and 7 parts of touch agent polymethyl methacrylate powder.

[0051] The dual-cure coating resin A of the matt layer of Example 2 is obtained by mixing and stirring the polyurethane acrylate prepolymer 120, the photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone 4 parts, the leveling agent silicone acrylate 1.5 parts, the defoaming agent polyether siloxane copolymer 0.7 parts and the matting agent silica 3 parts in parts by weight.

[0052] Example 3

[0053] The INS film of Example 3 has the same structure as the INS film of Example 1, except that the content of each component in the touch layer and the matte layer of Example 3 is different from that in Example 1, as follows:

[0054] The dual-cure coating resin B of the touch layer of Example 3 is obtained by mixing and stirring, in parts by weight, 120 parts of polyurethane acrylate prepolymer, 4 parts of photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1.5 parts of leveling agent silicone acrylate, 0.7 parts of defoaming agent polyether siloxane copolymer and 10 parts of touch agent polymethyl methacrylate powder.

[0055] The dual-cure coating resin A of the matt layer of Example 3 is obtained by mixing and stirring evenly 80 parts of a polyurethane acrylate prepolymer, 3 parts of a photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1.2 parts of a leveling agent silicone acrylate, 0.3 parts of a defoaming agent polyether siloxane copolymer and 7 parts of a matting agent silica.

[0056] Comparative Example 1

[0057] The INS film of Comparative Example 1 has the same structure as the INS film of Example 1, except that the composition components of the touch layer and the matte layer of Comparative Example 1 are different, as follows:

[0058] The coating resin of the touch layer of Comparative Example 1 is obtained by mixing and stirring evenly 90 parts of hydroxy acrylic resin, 5 parts of curing agent hexamethylene diisocyanate, 1 part of leveling agent silicone acrylate, 0.5 parts of defoaming agent polyether siloxane copolymer and 5 parts of touch agent polymethyl methacrylate powder, in parts by weight.

[0059] The coating resin of the matt layer of Comparative Example 1 is obtained by mixing and stirring evenly 90 parts of hydroxy acrylic resin, 5 parts of curing agent hexamethylene diisocyanate, 1 part of leveling agent silicone acrylate, 0.5 parts of defoaming agent polyether siloxane copolymer and 5 parts of matting agent silica powder, in parts by weight.

[0060] Performance Test of INS Membranes of Examples 1-3 and Comparative Example 1

[0061] High-temperature stretchability and formability: Place the finished INS film in the blister equipment, set the film baking temperature to 180°C and the baking time to 25-30s. The INS film will be stretched according to the mold placed in the blister equipment, and observe whether the film is damaged, thereby measuring its high-temperature stretch rate. In addition, the existing INS film and the corners of the plastic parts are prone to cracking, which is mainly due to the poor stretch rate of the INS film during the high-temperature stretching blister step, resulting in stretch cracking. Therefore, while measuring its high-temperature stretch rate, its formability can be judged.

[0062] Surface hardness: tested with Mitsubishi hardness test pen;

[0063] Chemical resistance test: Cover the surface of the INS film with gauze, apply SPF50, PA++ sunscreen evenly on the gauze, and put it in an 80℃ oven for aging for 24 hours. After aging, wipe off the sunscreen and observe the surface of the INS film.

[0064] The performance test structures of the INS membranes of Examples 1-3 and Comparative Example 1 are shown in Table 1.

[0065] Table 1

[0066] Surface hardness High temperature blister stretch rate Chemical resistance test Example 1 2H 300％ No visible appearance change Example 2 2H 300％ No visible appearance change Example 3 2H 300％ No visible appearance change Comparative Example 1 H 220％ Swelling, paint film peeling

[0067] From the performance test results of the INS films, it can be seen that the INS films of Examples 1-3 have better high-temperature plastic elongation and surface hardness than those of Comparative Example 1, and their chemical resistance is also better.

[0068] In addition, from Figure 1 It can be seen that there is no cracking at the corner between the INS film material of Example 1 and the plastic part. Figure 2 It can be seen from A in the figure that cracking occurs at the corner between the INS film material of comparative example 1 and the plastic part.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A high plasticity INS film, characterized in that: Including stacked from top to bottom: Matt layer, PMMA film layer, ink layer, adhesive layer and ABS substrate layer; The matte layer is formed by printing and coating the dual-curing coating resin A; The added amounts of the components in the dual-curing coating resin A include, by weight, 80-120 parts of polyurethane acrylate prepolymer, 3-5 parts of photoinitiator, 1-1.5 parts of leveling agent, 0.3-0.7 parts of defoaming agent and 3-7 parts of matting agent.

2. The high plasticity INS film according to claim 1, characterized in that: A touch layer is also provided on the matte layer, and the touch layer is formed by printing and coating the dual-curing coating resin B; The added amounts of the components in the dual-curing coating resin B include: by weight, 80-120 parts of polyurethane acrylate prepolymer, 3-5 parts of photoinitiator, 1-1.5 parts of leveling agent, 0.3-0.7 parts of defoaming agent and 5-10 parts of touch agent.

3. The high plasticity INS film according to claim 1, characterized in that: The matting agent is one or more of silicon dioxide and titanium dioxide.

4. The high plasticity INS film according to claim 2, characterized in that: The touch agent is one or more of ethylene terephthalate powder and polymethyl methacrylate powder.

5. The high plasticity INS film according to claim 1 or 2, characterized in that: The photoinitiator is one or more of 2-hydroxy-2-methyl-1-phenyl-1-propanone and 1-hydroxycyclohexyl phenyl ketone.

6. The high plasticity INS film according to claim 1 or 2, characterized in that: The polyurethane acrylate prepolymer is formed by reacting a polyether diol and a difunctional isocyanate compound to form an isocyanate-terminated first polyurethane prepolymer, then reacting an epoxy alcohol compound with the first polyurethane prepolymer to form an epoxy-terminated second modified polyurethane prepolymer, and finally reacting an acrylic compound with the second modified polyurethane prepolymer to form an unsaturated bond-terminated second modified polyurethane prepolymer.

7. The use of the high plasticity INS film according to claim 6, characterized in that: The molecular weight of the polyurethane acrylate prepolymer is Mn=8000-12000.

8. The use of the high plasticity INS film according to any one of claims 1 to 7, characterized in that: It is used in the surface treatment process of plastic products.

9. The use of the high plasticity INS film according to claim 8, characterized in that: The high plasticity INS film is first stretched three times, cut, and placed in a mold, and then the plastic product is injection molded into the mold. After demolding, the product is placed in a UV curing box for UV curing, with a light intensity of 600mj / cm 2 , Light exposure time: 4s-10s.

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