Heat transfer film and preparation method thereof

Abstract

The invention discloses a preparation method of a heat transfer film. The preparation method comprises the following steps: preparation of a release modifier: weighing the following raw materials in parts by weight: 30-35 parts of waterborne styrene maleic anhydride resin, 20-25 parts of vinyl silicone oil, 10-15 parts of paraffin, 35-40 parts of water, 2-4 parts of fatty alcohol-polyoxyethylene ether, 2-4 parts of pentaerythritol fatty acid ester and 5-8 parts of a modified filling agent. According to the heat transfer film, the PET film, the ink layer, the relief layer, the release coating and other layer structures are adopted to form the heat transfer film, the release coating in the heat transfer film is made of the release modifier, the water-based styrene maleic anhydride resin, the vinyl silicone oil, the paraffin and other raw materials in the release modifier are blended with the modified filling agent, and the prepared product is high in adhesion, good in heat transfer effect and good in heat transfer effect. And the product has excellent performance under the conditions of high temperature, heat and acid corrosion.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal transfer films, and particularly relates to a thermal transfer film and a preparation method thereof. Background Art

[0002] The thermal transfer process is a printing technology that transfers the decorative pattern on the thermal transfer film to the surface of the decorated article by heating the thermal transfer film once. Using the thermal transfer process, multi-color patterns can be formed in one step without color separation, so that realistic patterns can be printed even with simple equipment.

[0003] For the existing thermal transfer films, it is very difficult to coordinately improve the tear strength and adhesion performance of the release agent. It is very difficult to achieve the balance of high adhesion and low peel force of the product. Moreover, under high-temperature heat and acid corrosion conditions, the product performance is affected, which limits the use efficiency of the product. Based on this, the present invention makes further improvement treatment. Summary of the Invention

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide a thermal transfer film and a preparation method thereof to solve the problems raised in the above background art.

[0005] The present invention adopts the following technical solutions to solve the technical problems: The present invention provides a preparation method of a thermal transfer film, including the following steps: Step 1: Preparation of a release improver: Weigh the raw materials according to parts by weight: 30-35 parts of aqueous styrene maleic anhydride resin, 20-25 parts of vinyl silicone oil, 10-15 parts of paraffin, 35-40 parts of water, 2-4 parts of fatty alcohol polyoxyethylene ether, 2-4 parts of pentaerythritol fatty acid ester, and 5-8 parts of modified filler; Stir the above raw materials in a blender, with a stirring speed of 110-120 r / min, stir for 40-50 min, and the stirring temperature is 80-85 °C. After stirring, a release improver is obtained; Step 2: Select a PET film as the base film, spray an ink layer on the base film, a relief layer is plated on the upper part of the ink layer, a release improver is coated on the relief layer to form a release coating, and a polypropylene protective layer is provided on the release coating; Step 3: Set the bottom of the base film with EVA hot melt adhesive, and attach the thermal transfer film to the target material by heating the EVA hot melt adhesive.

[0006] Preferably, the preparation method of the modified filler is: S1: Mix 3-5 parts of silane coupling agent KH550, 1-3 parts of ethanol, and 4-7 parts of water thoroughly to obtain a silane coupling liquid; S2: 3-5 parts of flaky talc and 5-8 parts of modified whisker are added to 6-10 parts of silane coupling liquid and stirred thoroughly to obtain a modified filler.

[0007] Preferably, the preparation method of the flaky talc powder is: S11: stirring flaky talc powder in a sufficient amount of sodium citrate solution to obtain flaky talc liquid; S12: immersing the nano-silica sol into a sodium silicate solution which is 3-5 times the total amount of the nano-silica sol and stirring the solution to obtain a modified silica sol; S13: 2-5 parts of alginic acid and 1-3 parts of carboxymethyl cellulose are added to 5-8 parts of flaky talc liquid, and then 2-4 parts of modified silica sol are added, ball milled thoroughly, filtered and dried to obtain flaky talc powder.

[0008] Preferably, the mass fraction of the sodium citrate solution is 2-5%; the mass fraction of the sodium silicate solution is 3-6%.

[0009] Preferably, the ball milling is performed at a speed of 1500 r / min and stirring is performed for 1-2 h.

[0010] Preferably, the preparation method of the modified whisker agent is: S101: Stir the silicon carbide whiskers in a sufficient amount of hydrogen peroxide solution, then wash, filter and dry to obtain a silicon carbide whisker agent; S102: 2-5 parts of silicon carbide whisker agent, 3-6 parts of 5% by mass yttrium nitrate solution, and 4-7 parts of sodium dodecylbenzene sulfonate solution are fully mixed, and then washed with water, filtered, and dried to obtain a modified whisker agent.

[0011] Preferably, the mass fraction of the sodium dodecylbenzene sulfonate solution is 2-5%.

[0012] Preferably, the mass fraction of the hydrogen peroxide solution is 2-4%.

[0013] The invention also provides a thermal transfer film prepared by a method for preparing the thermal transfer film.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The thermal transfer film of the present invention is composed of a layer structure of a PET film, an ink layer, a relief layer, a release coating layer and the like. The release coating layer in the thermal transfer film is made of a release improver. The water-based styrene maleic anhydride resin, vinyl silicone oil, paraffin and other raw materials in the release improver are blended with a modified filler. The prepared product has high adhesion and a balanced improvement in low peeling force. The product has excellent performance under high temperature, heat and acid corrosion conditions. The flaky talc powder, the modified whisker agent and the silane coupling liquid in the modified filler are fully stirred. The flaky talc liquid in the flaky talc powder is blended with the modified silica sol. Through the synergistic effect between the raw materials, the obtained flaky talc powder and the modified whisker agent are better blended. The whisker-like structure in the modified whisker agent is blended with the flaky talc powder. Through the synergistic effect between the raw materials, the product performance is further improved. DETAILED DESCRIPTION

[0015] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. 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.

[0016] A method for preparing a thermal transfer film according to the present embodiment comprises the following steps: Step 1: Preparation of release improver: Weigh the raw materials according to weight: 30-35 parts of water-based styrene maleic anhydride resin, 20-25 parts of vinyl silicone oil, 10-15 parts of paraffin wax, 35-40 parts of water, 2-4 parts of fatty alcohol polyoxyethylene ether, 2-4 parts of pentaerythritol fatty acid ester and 5-8 parts of modified filler; The above raw materials are stirred in a mixer at a stirring speed of 110-120 r / min for 40-50 min and a stirring temperature of 80-85° C. After the stirring is completed, a release improver is obtained; Step 2: A PET film is selected as a base film, an ink layer is sprayed on the base film, a relief layer is plated on the ink layer, a release improver is coated on the relief layer to form a release coating, and a polypropylene protective layer is provided on the release coating; Step 3: The bottom of the base film is set with EVA hot melt, and the thermal transfer film is attached to the target material by heating the EVA hot melt.

[0017] The preparation method of the modified filler of this embodiment is: S1: 3-5 parts of silane coupling agent KH550, 1-3 parts of ethanol and 4-7 parts of water are mixed to obtain a silane coupling liquid; S2: Add 3 - 5 parts of flaky talc powder and 5 - 8 parts of modified whisker agent to 6 - 10 parts of silane coupling solution, and stir well to obtain the modified filling agent.

[0018] Preferably, the preparation method of the flaky talc powder is as follows: S11: Stir the flaky talc powder in a sufficient amount of sodium citrate solution to obtain a flaky talc solution; S12: Immerse the nano - silica sol into a sodium silicate solution that is 3 - 5 times the total amount of the nano - silica sol, and stir evenly to obtain a modified silica sol; S13: Add 2 - 5 parts of alginic acid and 1 - 3 parts of carboxymethyl cellulose to 5 - 8 parts of the flaky talc solution, then add 2 - 4 parts of the modified silica sol, ball - mill well, filter by suction, and dry to obtain the flaky talc powder.

[0019] In this example, the mass fraction of the sodium citrate solution is 2 - 5%; the mass fraction of the sodium silicate solution is 3 - 6%.

[0020] In this example, the ball - mill speed for sufficient ball - milling is 1500 r / min, and the stirring time is 1 - 2 h.

[0021] The preparation method of the modified whisker agent in this example is as follows: S101: Stir the silicon carbide whiskers in a sufficient amount of hydrogen peroxide solution, then wash with water, filter by suction, and dry to obtain the silicon carbide whisker agent; S102: Mix 2 - 5 parts of the silicon carbide whisker agent, 3 - 6 parts of a 5% yttrium nitrate solution by mass fraction, and 4 - 7 parts of a sodium dodecylbenzenesulfonate solution thoroughly, then wash with water, filter by suction, and dry to obtain the modified whisker agent.

[0022] In this example, the mass fraction of the sodium dodecylbenzenesulfonate solution is 2 - 5%.

[0023] In this example, the mass fraction of the hydrogen peroxide solution is 2 - 4%.

[0024] The thermal transfer film prepared by the preparation method of a thermal transfer film in this example.

[0025] Example 1. The preparation method of a thermal transfer film in this example includes the following steps: Step 1: Preparation of the release improver: Weigh the raw materials by weight: 30 parts of water - borne styrene - maleic anhydride resin, 20 parts of vinyl silicone oil, 10 parts of paraffin wax, 35 parts of water, 2 parts of fatty alcohol polyoxyethylene ether, 2 parts of pentaerythritol fatty acid ester, and 5 parts of the modified filling agent; The above raw materials were stirred in a mixer at a stirring speed of 110 r / min for 40 min at a stirring temperature of 80° C., and a release improver was obtained after the stirring was completed; Step 2: A PET film is selected as a base film, an ink layer is sprayed on the base film, a relief layer is plated on the ink layer, a release improver is coated on the relief layer to form a release coating, and a polypropylene protective layer is provided on the release coating; Step 3: The bottom of the base film is set with EVA hot melt, and the thermal transfer film is attached to the target material by heating the EVA hot melt.

[0026] The preparation method of the modified filler of this embodiment is: S1: 3 parts of silane coupling agent KH550, 1 part of ethanol and 4 parts of water are mixed to obtain a silane coupling liquid; S2: 3 parts of flaky talc and 5 parts of modified whisker are added to 6 parts of silane coupling liquid and stirred thoroughly to obtain a modified filler.

[0027] Preferably, the preparation method of the flaky talc powder is: S11: stirring flaky talc powder in a sufficient amount of sodium citrate solution to obtain flaky talc liquid; S12: immersing the nano-silica sol into a sodium silicate solution 3 times the total amount of the nano-silica sol and stirring evenly to obtain a modified silica sol; S13: 2 parts of alginic acid and 1 part of carboxymethyl cellulose are added to 5 parts of flaky talc liquid, and then 2 parts of modified silica sol are added, and the mixture is fully ball-milled, filtered, and dried to obtain flaky talc powder.

[0028] The mass fraction of the sodium citrate solution in this embodiment is 2%; the mass fraction of the sodium silicate solution is 3%.

[0029] The ball milling speed of this embodiment is 1500r / min, and the stirring is 1h.

[0030] The preparation method of the modified whisker agent of this embodiment is: S101: Stir the silicon carbide whiskers in a sufficient amount of hydrogen peroxide solution, then wash, filter and dry to obtain a silicon carbide whisker agent; S102: 2 parts of silicon carbide whisker agent, 3 parts of 5% by mass yttrium nitrate solution, and 4 parts of sodium dodecylbenzene sulfonate solution are fully mixed, and then washed with water, filtered, and dried to obtain a modified whisker agent.

[0031] The mass fraction of the sodium dodecylbenzenesulfonate solution of the present embodiment is 2%.

[0032] The mass fraction of the hydrogen peroxide solution in this embodiment is 2%.

[0033] The thermal transfer film is prepared by a method for preparing a thermal transfer film in this embodiment.

[0034] Example 2. A method for preparing a thermal transfer film according to the present embodiment comprises the following steps: Step 1: Preparation of release improver: Weigh the raw materials according to weight: 35 parts of water-based styrene maleic anhydride resin, 25 parts of vinyl silicone oil, 15 parts of paraffin wax, 40 parts of water, 4 parts of fatty alcohol polyoxyethylene ether, 4 parts of pentaerythritol fatty acid ester and 8 parts of modified filler; The above raw materials were stirred in a mixer at a stirring speed of 120 r / min for 50 min at a stirring temperature of 85° C., and a release improver was obtained after the stirring was completed; Step 2: A PET film is selected as a base film, an ink layer is sprayed on the base film, a relief layer is plated on the ink layer, a release improver is coated on the relief layer to form a release coating, and a polypropylene protective layer is provided on the release coating; Step 3: The bottom of the base film is set with EVA hot melt, and the thermal transfer film is attached to the target material by heating the EVA hot melt.

[0035] The preparation method of the modified filler of this embodiment is: S1: 5 parts of silane coupling agent KH550, 3 parts of ethanol and 7 parts of water are mixed to obtain a silane coupling liquid; S2: 5 parts of flaky talc and 8 parts of modified whisker are added to 10 parts of silane coupling liquid and stirred thoroughly to obtain a modified filler.

[0036] Preferably, the preparation method of the flaky talc powder is: S11: stirring flaky talc powder in a sufficient amount of sodium citrate solution to obtain flaky talc liquid; S12: immersing the nano-silica sol into a sodium silicate solution with a volume 5 times the total volume of the nano-silica sol and stirring the solution to obtain a modified silica sol; S13: 5 parts of alginic acid and 3 parts of carboxymethyl cellulose are added to 8 parts of flaky talc liquid, and then 4 parts of modified silica sol are added, the mixture is fully ball-milled, filtered and dried to obtain flaky talc powder.

[0037] The mass fraction of the sodium citrate solution in this embodiment is 5%; the mass fraction of the sodium silicate solution is 6%.

[0038] The ball milling in this embodiment is fully carried out at a ball milling speed of 1500 r / min and stirring for 1-2 hours.

[0039] The preparation method of the modified whisker agent of this embodiment is: S101: Stir the silicon carbide whiskers sufficiently in a sufficient amount of hydrogen peroxide solution, then wash with water, filter by suction, and dry to obtain a silicon carbide whisker agent; S102: Blend 5 parts of the silicon carbide whisker agent, 6 parts of a 5% yttrium nitrate solution by mass fraction, and 7 parts of a sodium dodecylbenzenesulfonate solution sufficiently, then wash with water, filter by suction, and dry to obtain a modified whisker agent.

[0040] In this example, the mass fraction of the sodium dodecylbenzenesulfonate solution is 5%.

[0041] In this example, the mass fraction of the hydrogen peroxide solution is 4%.

[0042] A thermal transfer film prepared by the method for preparing a thermal transfer film in this example.

[0043] Example 3. A method for preparing a thermal transfer film in this example includes the following steps: Step 1: Preparation of a release improver: Weigh the raw materials according to parts by weight: 32.5 parts of an aqueous styrene maleic anhydride resin, 22.5 parts of vinyl silicone oil, 12.5 parts of paraffin wax, 37.5 parts of water, 3 parts of fatty alcohol polyoxyethylene ether, 3 parts of pentaerythritol fatty acid ester, and 6.5 parts of a modified filler; Stir the above raw materials in a blender. The stirring speed is 115 r / min, stir for 45 min, and the stirring temperature is 82 °C. After stirring ends, obtain a release improver; Step 2: Select a PET film as the base film, spray an ink layer on the base film, a relief layer is plated on the upper part of the ink layer, a release improver is coated on the relief layer to form a release coating, and a polypropylene protective layer is provided on the release coating; Step 3: Set the bottom of the base film with EVA hot melt adhesive, and attach the thermal transfer film to the target material by heating the EVA hot melt adhesive.

[0044] The preparation method of the modified filler in this example is: S1: Blend 4 parts of silane coupling agent KH550, 2 parts of ethanol, and 5.5 parts of water sufficiently to obtain a silane coupling solution; S2: Add 4 parts of flaky talc powder and 6.5 parts of the modified whisker agent to 8 parts of the silane coupling solution and stir sufficiently to obtain a modified filler.

[0045] Preferably, the preparation method of the flaky talc powder is: S11: Stir the flaky talc powder sufficiently in a sufficient amount of sodium citrate solution to obtain a flaky talc solution; S12: Immerse the nano-silica sol into a sodium silicate solution that is 4 times the total amount of the nano-silica sol and stir evenly to obtain a modified silica sol; S13: Add 3.5 parts of alginic acid and 2 parts of carboxymethyl cellulose into 6.5 parts of flaky talc solution, then add 3 parts of modified silica sol, ball mill thoroughly, filter by suction, and dry to obtain flaky talc powder.

[0046] In this example, the mass fraction of the sodium citrate solution is 3.5%; the mass fraction of the sodium silicate solution is 4.5%.

[0047] In this example, the ball mill speed for thorough ball milling is 1500 r / min, and stir for 1.5 h.

[0048] The preparation method of the modified whisker agent in this example is as follows: S101: Stir the silicon carbide whiskers sufficiently in a sufficient amount of hydrogen peroxide solution, then wash with water, filter by suction, and dry to obtain silicon carbide whisker agent; S102: Mix 3.5 parts of silicon carbide whisker agent, 4.5 parts of yttrium nitrate solution with a mass fraction of 5%, and 5.5 parts of sodium dodecylbenzenesulfonate solution thoroughly, then wash with water, filter by suction, and dry to obtain the modified whisker agent.

[0049] In this example, the mass fraction of the sodium dodecylbenzenesulfonate solution is 3.5%.

[0050] In this example, the mass fraction of the hydrogen peroxide solution is 3%.

[0051] The thermal transfer film prepared by the preparation method of a thermal transfer film in this example.

[0052] Comparative Example 1. The difference from Example 3 is that the modified filler is not added.

[0053] Comparative Example 2. The difference from Example 3 is that the flaky talc powder is not added to the modified filler.

[0054] Comparative Example 3. The difference from Example 3 is that the modified silica sol is not added in the preparation of the flaky talc powder.

[0055] Comparative Example 4. The difference from Example 3 is that the modified whisker agent is not added.

[0056] Comparative Example 5. The difference from Example 3 is that the modified whisker agent is replaced with silicon carbide whiskers.

[0057] The product performance tests of Examples 1 - 3 and Comparative Examples 1 - 5 are as follows. Place the products at 65 °C for 12 h, and then place them under the condition of 2% hydrochloric acid mist for 12 h to test the high-temperature resistance and acid corrosion stability of the products. The tests are as follows:

[0058] It can be seen from Comparative Examples 1-5 and Example 3 that the product of the example has a coordinated effect of low peel and high adhesion, and at the same time, the product has remarkable effects of acid and corrosion resistance and high-temperature stability. When the modified filler is not added in the present invention, the product performance deteriorates significantly. In addition, when the flaky talc powder is not added to the modified filler and the modified whisker agent is not added, the product performance shows an obvious deterioration trend. At the same time, when the modified silica sol is not added in the preparation of the flaky talc powder and the modified whisker agent is replaced with silicon carbide whiskers, the product performance also shows a deterioration trend. Only when the product raw materials obtained by the method of the present invention are used, the product performance effect is the most significant.

[0059] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0060] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for preparing a thermal transfer film, characterized in that: The following steps are involved: Step 1: Preparation of release improver: Weigh the raw materials according to weight: 30-35 parts of water-based styrene maleic anhydride resin, 20-25 parts of vinyl silicone oil, 10-15 parts of paraffin wax, 35-40 parts of water, 2-4 parts of fatty alcohol polyoxyethylene ether, 2-4 parts of pentaerythritol fatty acid ester and 5-8 parts of modified filler; The above raw materials are stirred in a mixer at a stirring speed of 110-120 r / min for 40-50 min and a stirring temperature of 80-85° C., and the release improver is obtained after the stirring is completed; Step 2: A PET film is selected as a base film, an ink layer is sprayed on the base film, a relief layer is plated on the ink layer, a release improver is coated on the relief layer to form a release coating, and a polypropylene protective layer is provided on the release coating; Step 3: The bottom of the base film is set with EVA hot melt, and the thermal transfer film is attached to the target material by heating the EVA hot melt.

2. The method for preparing a thermal transfer film according to claim 1, characterized in that: The preparation method of the modified filler is: S1: 3-5 parts of silane coupling agent KH550, 1-3 parts of ethanol and 4-7 parts of water are mixed to obtain a silane coupling liquid; S2: 3-5 parts of flaky talc and 5-8 parts of modified whisker are added to 6-10 parts of silane coupling liquid and stirred thoroughly to obtain a modified filler.

3. The method for preparing a thermal transfer film according to claim 2, characterized in that: The preparation method of the flaky talcum powder is: S11: stirring flaky talc powder in a sufficient amount of sodium citrate solution to obtain flaky talc liquid; S12: immersing the nano-silica sol into a sodium silicate solution which is 3-5 times the total amount of the nano-silica sol and stirring the solution to obtain a modified silica sol; S13: 2-5 parts of alginic acid and 1-3 parts of carboxymethyl cellulose are added to 5-8 parts of flaky talc liquid, and then 2-4 parts of modified silica sol are added, ball milled thoroughly, filtered and dried to obtain flaky talc powder.

4. The method for preparing a thermal transfer film according to claim 3, characterized in that: The mass fraction of the sodium citrate solution is 2-5%; the mass fraction of the sodium silicate solution is 3-6%.

5. The method for preparing a thermal transfer film according to claim 3, characterized in that: The ball milling is performed at a speed of 1500 r / min and stirred for 1-2 hours.

6. The method for preparing a thermal transfer film according to claim 2, characterized in that: The preparation method of the modified whisker agent is: S101: Stir the silicon carbide whiskers in a sufficient amount of hydrogen peroxide solution, then wash, filter and dry to obtain a silicon carbide whisker agent; S102: 2-5 parts of silicon carbide whisker agent, 3-6 parts of 5% by mass yttrium nitrate solution, and 4-7 parts of sodium dodecylbenzene sulfonate solution are fully mixed, and then washed with water, filtered, and dried to obtain a modified whisker agent.

7. A method for preparing a thermal transfer film according to claim 6, characterized in that: The mass fraction of the sodium dodecylbenzene sulfonate solution is 2-5%.

8. The method for preparing a thermal transfer film according to claim 6, characterized in that: The mass fraction of the hydrogen peroxide solution is 2-4%.

9. A thermal transfer film prepared by the method for preparing a thermal transfer film according to any one of claims 1 to 8.

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