A UV light-curing resin for holographic in-mold transfer film and a transfer film prepared therefrom

Abstract

The present invention provides a UV-curable resin for holographic in-mold transfer films and a transfer film prepared therefrom. The UV-curable resin comprises the following components by weight: 10-20 parts modified polyether acrylate, 15-10 parts amine-modified polyether acrylate, 15-20 parts polysiloxane polyurethane (PUA), 15-20 parts silicone polyether acrylate, 10-20 parts aromatic polyurethane (PUA), 10-15 parts tertiary amine acrylate, 3-7 parts ultraviolet absorber, and 3-7 parts photoinitiator. The holographic in-mold transfer film comprises, from bottom to top, a base film, a release layer, a holographic layer, a connecting layer, a coating, an ink layer, and an adhesive layer. The holographic layer is produced by UV embossing using the UV-curable resin. The transfer film prepared by the present invention not only provides a holographic pattern, enhancing the aesthetics of home appliances, but also exhibits excellent wear resistance, hardness, solvent resistance, and weather resistance, protecting the coating beneath the holographic layer and the home appliance from damage, thereby extending the lifespan of the home appliance.

Description

Technical Field

[0001] The invention belongs to the technical field of decorative films, and particularly relates to a UV light-curing resin for a holographic in-mold transfer film and a transfer film prepared using the same. Background Art

[0002] In the existing technology, with the popularization of home appliances in daily life, users not only pursue the quality of home appliances, but also pay more and more attention to the aesthetics of home appliances. In-mold transfer film, as an important decoration to improve the appearance of home appliances, is increasingly favored by home appliance manufacturers. In-mold transfer film is easy to use and can be integrally formed with the home appliance shell. Covering the surface of the home appliance shell not only improves the aesthetics of the home appliance, but also has a certain protective effect on the home appliance.

[0003] Traditional in-mold transfer films achieve aesthetic effects by preparing patterns through printing inks, which is a relatively simple method; traditional hot press transfer technology can only transfer patterns to items such as fabrics and leather. The patterns formed are prone to damage and still cannot make the transferred patterns wear-resistant and scratch-resistant. Summary of the Invention

[0004] In view of this, the present invention provides a UV light-curing resin for a holographic in-mold transfer film and a transfer film prepared using the same, which improves the appearance of the product while also playing a protective role.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A UV light-curing resin for a holographic in-mold transfer film comprises the following components in parts by weight: 10-20 parts of modified polyether acrylate, 15-10 parts of amine-modified polyether acrylate, 15-20 parts of polysiloxane PUA, 15-20 parts of silicone polyether acrylate, 10-20 parts of aromatic PUA, 10-15 parts of tertiary amine acrylate, 3-7 parts of an ultraviolet absorber, and 3-7 parts of a photoinitiator.

[0007] In some specific embodiments, preferably, the UV light-curing resin for the holographic in-mold transfer film includes the following components in parts by weight: 15 parts of modified polyether acrylate, 12 parts of amine-modified polyether acrylate, 17 parts of polysiloxane PUA, 17 parts of silicone polyether acrylate, 15 parts of aromatic PUA, 12 parts of tertiary amine acrylate, 5 parts of ultraviolet absorber, and 5 parts of photoinitiator.

[0008] Furthermore, the photoinitiator is 1-hydroxycyclohexyl phenyl ketone.

[0009] A holographic in-mold transfer film comprises, from bottom to top, a base film, a release layer, a holographic layer, a connecting layer, a plating layer, an ink layer and a back adhesive layer; wherein the holographic layer is made of the above-mentioned UV light-curing resin by UV embossing.

[0010] Furthermore, the base film is made of polyethylene terephthalate and has a thickness of 30 to 50 μm.

[0011] Furthermore, the release layer is a silicone coating with a thickness of 1 to 3 μm.

[0012] Furthermore, the thickness of the holographic layer is 4-10 μm.

[0013] Furthermore, the connecting layer is a silane coupling agent coating or a diethylphosphinate aluminum coating, and has a thickness of 2 to 5 nm.

[0014] Furthermore, the coating is aluminum or zinc sulfide with a thickness of

[0015] Compared with the prior art, the present invention has the following beneficial effects: the UV light-curing resin applied in the present invention is used as the holographic layer material, and a holographic pattern is prepared through a UV molding process. After the holographic in-mold transfer film is applied to the surface of the home appliance, the base film is peeled off, the release layer and the holographic layer are separated, and the holographic layer remains on the surface of the home appliance, on the outermost side. This not only provides a holographic pattern and improves the aesthetics of the home appliance, but also the holographic layer UV light-curing resin has good wear resistance, high hardness, solvent resistance and weather resistance, which can protect the coating and home appliance below the holographic layer from damage and increase the service life of the home appliance; the connecting layer is a silane coupling agent or ADP, which can improve the adhesion between the coating and the holographic layer, solving the problem of poor adhesion between UV light-curing material layers; the coating can improve the brightness of the holographic pattern in the holographic layer, and at the same time protect the microstructure of the holographic pattern from being filled and damaged by the ink layer material; the ink layer is formed by printing the pattern with ink, and the printed pattern and the holographic pattern are combined to achieve the technical effect of 1+1>2. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a holographic in-mold transfer film provided by a specific embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of a household appliance housing prepared using a holographic in-mold transfer film according to a specific embodiment of the present invention.

[0018] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0019] 100-holographic in-mold transfer film; 110-base film; 120-release layer; 130-holographic layer; 131-holographic pattern; 140-connecting layer; 150-plating layer; 160-ink layer; 170-adhesive layer; 200-home appliance housing prepared using holographic in-mold transfer film; 210-home appliance housing. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to specific embodiments so that those skilled in the art can understand the present invention more clearly.

[0021] Main material sources:

[0022] Modified polyether acrylate uses BASF LR8945; amine-modified polyether acrylate uses BASF LR8894; polysiloxane PUA uses Sartomer CN990; silicone polyether acrylate uses Changxing 6225; aromatic PUA uses Deqian UR-33; tertiary amine acrylate uses Changxing 6421 or Changxing 420.

[0023] The raw materials not specifically described in the present invention are all existing materials that can be directly purchased from the market.

[0024] The specific scheme of the present invention is as follows:

[0025] Weigh 10-20 parts of modified polyether acrylate, 15-10 parts of amine-modified polyether acrylate, 15-20 parts of polysiloxane PUA, 15-20 parts of silicone polyether acrylate, 10-20 parts of aromatic PUA, 10-15 parts of tertiary amine acrylate, 3-7 parts of ultraviolet absorber, and 3-7 parts of photoinitiator; add them into the container in sequence and stir until they are completely dispersed to obtain UV light-curing resin.

[0026] A 30-50 μm polyethylene terephthalate (PET) is used as a base film 110, and a silicone coating is applied on the surface of the base film 110 to form a release layer 120 with a thickness of 1-3 μm. The above-mentioned UV light-curable resin is used as an embossing glue, and a holographic pattern 131 is embossed on the surface of the release layer 120 by UV molding. The thickness of the holographic layer 130 is 4-10 μm. A silane coupling agent or a diethylphosphinate aluminum coating is applied on the surface of the holographic layer 130 to obtain a connecting layer 140 with a thickness of 2-5 nm. Zinc sulfide is evaporated on the surface of the connecting layer to obtain a holographic pattern 131 with a thickness of 10 μm. The coating layer 150 is formed, ink is printed on the surface of the coating layer to obtain an ink layer 160, and glue is applied on the surface of the ink layer to obtain a back adhesive layer 170, thereby obtaining a holographic in-mold transfer film 100.

[0027] The prepared holographic in-mold transfer film 100 is transferred to the surface of the home appliance housing 210 by in-mold transfer to form the home appliance housing 200 .

[0028] In the above technical solution, modified polyether acrylate, amine-modified polyether acrylate, polysiloxane PUA, silicone polyether acrylate and aromatic PUA are oligomers. Among them, modified polyether acrylate has low viscosity, high hardness and chemical resistance, which can improve the hardness and solvent resistance of the photocurable material system, and at the same time can reduce the viscosity of the photocurable material system and reduce the use of monomers; amine-modified polyether acrylate has high reactivity, yellowing resistance and chemical resistance, which can increase the reaction speed of the photocurable material system, reduce the energy required for the reaction, and also improve the solvent resistance of the photocurable material system; polysiloxane PUA has good flexibility and surface smoothness, which can increase the elongation of the photocurable material system and reduce the surface friction coefficient of the photocurable material system, thereby Improve the wear resistance of the photocurable material system; silicone polyether acrylate has low viscosity and good wear resistance, which can reduce the viscosity of the photocurable material system and improve the wear resistance of the photocurable material system; aromatic PUA has high cross-linking density and solubility resistance, which can increase the reaction speed of the photocurable material system and reduce the curing energy, while increasing the cross-linking density of the system and improving the wear resistance, hardness and solvent resistance of the photocurable material; the monomer is tertiary amine acrylate, which has good stability and can reduce oxygen inhibition and increase the reaction speed of the system; among them, the UV absorber can improve the weather resistance of the photocurable material system.

[0029] Example 1

[0030] This embodiment provides a UV light-curable resin for a holographic in-mold transfer film and a transfer film prepared using the same, comprising the following steps:

[0031] Preparation of UV light curing resin:

[0032] Weigh 10 parts of modified polyether acrylate, 15 parts of amine-modified polyether acrylate, 20 parts of polysiloxane PUA, 20 parts of silicone polyether acrylate, 10 parts of aromatic PUA, 15 parts of tertiary amine acrylate, 5 parts of ultraviolet absorber, and 5 parts of photoinitiator; add them into the container in sequence and stir until they are completely dispersed to obtain UV light-curing resin.

[0033] Preparation of holographic in-mold transfer film:

[0034] A 30 μm PET film was used as the base film 110. A silicone coating was applied to the surface of the base film 110 to form a release layer 120 with a thickness of 1 μm. The above-mentioned UV light-curing resin was used as the embossing adhesive. A holographic pattern 131 was embossed on the surface of the release layer 120 by UV molding. The holographic layer 130 had a thickness of 4 μm. A silane coupling agent was applied to the surface of the holographic layer 130 to obtain a connecting layer 140 with a thickness of 2 nm. Zinc sulfide was evaporated on the surface of the connecting layer 140 to obtain a holographic pattern 131 with a thickness of 2 nm. The coating layer 150 is formed, ink is printed on the surface of the coating layer to obtain an ink layer 160, and glue is applied on the surface of the ink layer to obtain a back adhesive layer 170, thereby obtaining a holographic in-mold transfer film 100.

[0035] Example 2

[0036] This embodiment provides a UV light-curable resin for a holographic in-mold transfer film and a transfer film prepared using the same, comprising the following steps:

[0037] Preparation of UV light curing resin:

[0038] Weigh 15 parts of modified polyether acrylate, 12 parts of amine-modified polyether acrylate, 17 parts of polysiloxane PUA, 17 parts of silicone polyether acrylate, 15 parts of aromatic PUA, 12 parts of tertiary amine acrylate, 5 parts of ultraviolet absorber, and 5 parts of photoinitiator; add them into the container in sequence and stir until they are completely dispersed to obtain UV light-curing resin.

[0039] Preparation of holographic in-mold transfer film:

[0040] A 40 μm PET film was used as the base film 110. A silicone coating was applied to the surface of the base film 110 to form a release layer 120 with a thickness of 2 μm. The above-mentioned UV light-curing resin was used as the embossing adhesive. A holographic pattern 131 was embossed on the surface of the release layer 120 by UV molding. The holographic layer 130 had a thickness of 6 μm. A silane coupling agent was applied to the surface of the holographic layer 130 to obtain a connecting layer 140 with a thickness of 3 nm. Zinc sulfide was evaporated on the surface of the connecting layer 140 to obtain a holographic pattern 131 with a thickness of 6 μm. The coating layer 150 is formed, ink is printed on the surface of the coating layer to obtain an ink layer 160, and glue is applied on the surface of the ink layer to obtain a back adhesive layer 170, thereby obtaining a holographic in-mold transfer film 100.

[0041] Example 3

[0042] This embodiment provides a UV light-curable resin for a holographic in-mold transfer film and a transfer film prepared using the same, comprising the following steps:

[0043] Preparation of UV light curing resin:

[0044] Weigh 20 parts of modified polyether acrylate, 10 parts of amine-modified polyether acrylate, 15 parts of polysiloxane PUA, 15 parts of silicone polyether acrylate, 20 parts of aromatic PUA, 10 parts of tertiary amine acrylate, 5 parts of ultraviolet absorber, and 5 parts of photoinitiator; add them into the container in sequence and stir until they are completely dispersed to obtain UV light-curing resin.

[0045] Preparation of holographic in-mold transfer film:

[0046] A 50 μm PET film is used as the base film 110. A silicone coating is applied to the surface of the base film 110 to form a release layer 120 with a thickness of 3 μm. The above-mentioned UV light-curing resin is used as an embossing adhesive. A holographic pattern 131 is embossed on the surface of the release layer 120 by UV molding. The holographic layer 130 has a thickness of 10 μm. A silane coupling agent is applied to the surface of the holographic layer 130 to obtain a connecting layer 140 with a thickness of 5 nm. Zinc sulfide is evaporated on the surface of the connecting layer 140 to obtain a holographic pattern 131 with a thickness of 10 μm. The coating layer 150 is formed, ink is printed on the surface of the coating layer to obtain an ink layer 160, and glue is applied on the surface of the ink layer to obtain a back adhesive layer 170, thereby obtaining a holographic in-mold transfer film 100.

[0047] Comparative Example 1

[0048] This comparative example provides a UV light-curing resin for holographic in-mold transfer film and a transfer film prepared using the same. The raw materials and steps are basically the same as those of Example 3 except that the modified polyether acrylate is removed from the UV light-curing resin component.

[0049] Comparative Example 2

[0050] This comparative example provides a UV light-curing resin for holographic in-mold transfer film and a transfer film prepared using the same. The raw materials and steps are basically the same as those in Example 3 except that the amine-modified polyether acrylate is removed from the UV light-curing resin component.

[0051] Comparative Example 3

[0052] This comparative example provides a UV light-curing resin for holographic in-mold transfer film and a transfer film prepared using the same. The raw materials and steps are basically the same as those in Example 3, except that the aromatic PUA is removed from the UV light-curing resin component.

[0053] Comparative Example 4

[0054] This comparative example provides a UV light-curing resin for holographic in-mold transfer film and a transfer film prepared therefrom. The raw materials and steps are basically the same as those in Example 3 except that the modified polyether acrylate in the UV light-curing resin component is replaced by polyethylene glycol instead of acrylate.

[0055] Comparative Example 5

[0056] This comparative example provides a UV light-curing resin for holographic in-mold transfer film and a transfer film prepared therefrom. The raw materials and steps are basically the same as those in Example 3 except that the amine-modified polyether acrylate in the UV light-curing resin component is replaced by polyether acrylate.

[0057] Comparative Example 6

[0058] This comparative example provides a UV curable resin for holographic in-mold transfer film and a transfer film prepared therefrom. The raw materials and steps are basically the same as those in Example 3. The difference is that in the preparation of the holographic in-mold transfer film, the process of coating the surface of the holographic layer 130 with a silane coupling agent to obtain a connection layer 140 with a thickness of 5 nm is omitted, and zinc sulfide is directly evaporated on the surface of the holographic layer 130 to obtain a connection layer 140 with a thickness of 5 nm. The coating is 150.

[0059] In order to further explore the performance of the holographic in-mold transfer films prepared in Examples 1-3 and Comparative Examples 1-4, various parameters thereof were measured. The results are shown in Table 1 below:

[0060] Table 1 Performance parameters of the holographic in-mold transfer films prepared in Examples and Comparative Examples

[0061] project hardness Interlayer adhesion Wear resistance UV embossing performance Solvent resistance Example 1 1H@500g good good good good Example 2 1H@500g good good good good Example 3 1H@500g good good good good Comparative Example 1 HB@500g good Difference good Difference Comparative Example 2 / / / Sticky board / Comparative Example 3 HB@500g good Difference good Difference Comparative Example 4 HB@500g Poor Difference Difference Difference Comparative Example 5 HB@500g Poor Difference Difference Difference Comparative Example 6 1H@500g Difference good good good

[0062] Among them, the hardness was measured using the pencil hardness test method (loaded with a 500 g weight);

[0063] The interlayer adhesion is measured according to the method in GB / T9286;

[0064] Wear resistance test: Use a rubber head to load a 500g weight and circulate the sanding for 500 times. If there is no scratch or coating falling off, it is qualified.

[0065] Solvent resistance test: drop ethanol and ethyl ester on the non-woven fabric, apply a force of 500g, and wipe back and forth 50 times. If there is no scratch on the surface, it meets the standard.

[0066] The results in Table 1 show that the hardness, wear resistance, and solvent resistance of the holographic in-mold transfer film prepared by removing the modified polyether acrylate or aromatic PUA from the UV-curable resin are poor; sticking occurs when the amine-modified polyether acrylate is removed; and the interlayer adhesion of the holographic in-mold transfer film is poor when the coating layer is directly applied without the tie layer. The present invention selects appropriate UV-curable resin components and determines the proportions of each component, and prepares the holographic in-mold transfer film according to the steps of, from bottom to top, a base film, a release layer, a holographic layer, a tie layer, a coating layer, an ink layer, and an adhesive layer. The film exhibits excellent performance parameters and good adaptability.

[0067] The above is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A UV light curing resin for holographic in-mold transfer film, characterized in that: The invention comprises the following components in parts by weight: 10-20 parts of modified polyether acrylate, 15-10 parts of amine-modified polyether acrylate, 15-20 parts of polysiloxane PUA, 15-20 parts of silicone polyether acrylate, 10-20 parts of aromatic PUA, 10-15 parts of tertiary amine acrylate, 3-7 parts of ultraviolet absorber, and 3-7 parts of photoinitiator; The modified polyether acrylate is specifically BASF LR8945; the amine-modified polyether acrylate is specifically BASF LR8894.

2. A UV light curing resin for holographic in-mold transfer film, characterized in that: The invention comprises the following components in parts by weight: 15 parts of modified polyether acrylate, 12 parts of amine-modified polyether acrylate, 17 parts of polysiloxane PUA, 17 parts of silicone polyether acrylate, 15 parts of aromatic PUA, 12 parts of tertiary amine acrylate, 5 parts of ultraviolet absorber, and 5 parts of photoinitiator; The modified polyether acrylate is specifically BASF LR8945; the amine-modified polyether acrylate is specifically BASF LR8894.

3. The UV curable resin according to any one of claims 1 or 2, characterized in that: The photoinitiator is 1-hydroxycyclohexyl phenyl ketone.

4. A holographic in-mold transfer film, characterized in that: From bottom to top, it comprises a base film, a release layer, a holographic layer, a connecting layer, a plating layer, an ink layer and a back adhesive layer; wherein the holographic layer is made of the UV light-curing resin according to any one of claims 1 to 3 by UV embossing.

5. The holographic in-mold transfer film according to claim 4, characterized in that: The base film is made of polyethylene terephthalate and has a thickness of 30-50 μm.

6. The holographic in-mold transfer film according to claim 4, characterized in that: The release layer is a silicone coating with a thickness of 1 to 3 μm.

7. The holographic in-mold transfer film according to claim 4, characterized in that: The thickness of the holographic layer is 4-10 μm.

8. The holographic in-mold transfer film according to claim 4, characterized in that: The connecting layer is a silane coupling agent coating or a diethylphosphinate aluminum coating, and has a thickness of 2-5 nm.

9. The holographic in-mold transfer film according to claim 4, characterized in that: The coating is aluminum or zinc sulfide, and has a thickness of 200-500Å.

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