A heat transfer film and a method of making the same

Abstract

The application discloses a preparation method of a heat transfer film, and comprises the following steps: preparing a release improver, weighing raw materials according to weight parts, namely, 30-35 parts of water-based 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; the heat transfer film is composed of a PET film, an ink layer, a relief layer, a release coating and the like; the release coating in the heat transfer film is prepared by using the release improver; the water-based styrene maleic anhydride resin, the vinyl silicone oil, the paraffin and the like in the release improver are mixed with the modified filler to prepare a product, the product has high adhesion, low peel force and balanced improvement, and the product has excellent performance under high-temperature heat and acid corrosion conditions.

Description

Technical Field

[0001] This invention relates to the field of heat transfer film technology, specifically to a heat transfer film and its preparation method. Background Technology

[0002] Heat transfer printing is a printing technology that transfers decorative patterns from a heat transfer film to the surface of an object by heating the film once. With heat transfer printing, multi-color patterns can be printed in one go without color matching, so even simple equipment can print realistic patterns.

[0003] Existing heat transfer films have release agents whose tear strength and adhesion properties are difficult to coordinate and improve. It is difficult to achieve a balance between high adhesion and low peel force for products. Furthermore, under high temperature and acid corrosion conditions, the performance of products is affected, which limits the efficiency of product use. Based on this, the present invention further improves them. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the purpose of this invention is to provide a thermal transfer film and its preparation method to solve the problems mentioned in the background art.

[0005] The present invention solves the technical problem by adopting the following technical solution:

[0006] This invention provides a method for preparing a heat transfer film, comprising the following steps:

[0007] Step 1: Preparation of release modifier:

[0008] Weigh the raw materials according to their weight proportions:

[0009] 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 modifier filler.

[0010] The above raw materials are mixed in a mixer at a speed of 110-120 r / min for 40-50 min at a temperature of 80-85℃. After mixing, the release modifier is obtained.

[0011] Step 2: Select PET film as the base film, spray ink layer on the base film, plate embossed layer on the top of ink layer, coat release modifier on embossed layer to form release coating, and set polypropylene protective layer on release coating;

[0012] Step 3: The bottom of the substrate film is set with EVA hot melt adhesive. By heating the EVA hot melt adhesive, the heat transfer film is attached to the target material.

[0013] Preferably, the modified filler is prepared by:

[0014] 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 solution;

[0015] S2: Add 3-5 parts of flake talc powder and 5-8 parts of modified whisker agent to 6-10 parts of silane coupling liquid and stir thoroughly to obtain modified filler.

[0016] Preferably, the method for preparing the flake talc powder is as follows:

[0017] S11: Stir flake talc powder in a sufficient amount of sodium citrate solution to obtain flake talc liquid;

[0018] S12: Immerse the nano-silica sol in a sodium silicate solution that is 3-5 times the total volume of the nano-silica sol and stir until homogeneous to obtain modified silica sol;

[0019] S13: Add 2-5 parts alginic acid and 1-3 parts carboxymethyl cellulose to 5-8 parts of flake talc liquid, then add 2-4 parts modified silica sol, ball mill thoroughly, filter, and dry to obtain flake talc powder.

[0020] Preferably, the sodium citrate solution has a mass fraction of 2-5%; the sodium silicate solution has a mass fraction of 3-6%.

[0021] Preferably, the ball milling is performed at a speed of 1500 r / min for 1-2 hours.

[0022] Preferably, the modified whisker agent is prepared by:

[0023] S101: Stir silicon carbide whiskers thoroughly in a sufficient amount of hydrogen peroxide solution, then wash with water, filter, and dry to obtain silicon carbide whisker agent;

[0024] S102: Mix 2-5 parts of silicon carbide whisker agent, 3-6 parts of 5% yttrium nitrate solution, and 4-7 parts of sodium dodecylbenzenesulfonate solution thoroughly, then wash with water, filter, and dry to obtain modified whisker agent.

[0025] Preferably, the sodium dodecylbenzenesulfonate solution has a mass fraction of 2-5%.

[0026] Preferably, the hydrogen peroxide solution has a mass fraction of 2-4%.

[0027] The present invention also provides a method for preparing a heat transfer film.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] This invention relates to a heat transfer film composed of a PET film, an ink layer, an embossed layer, and a release coating. The release coating is made with a release modifier. The release modifier contains water-based styrene-maleic anhydride resin, vinyl silicone oil, and paraffin wax, which are mixed with a modifier and filler. This results in a balanced improvement in the product's high adhesion and low peel strength, as well as excellent product performance under high-temperature and acidic conditions. The modifier is prepared by thoroughly stirring flake talc powder, modified whisker agent, and silane coupling liquid. The flake talc liquid in the flake talc powder is mixed with modified silica sol. Through the synergistic effect between the raw materials, the flake talc powder and the modified whisker agent are better blended. The whisker-like structure in the modified whisker agent is mixed with the flake talc powder. Through the synergistic effect between the raw materials, the product performance is further improved. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This embodiment of a method for preparing a heat transfer film includes the following steps:

[0032] Step 1: Preparation of release modifier:

[0033] Weigh the raw materials according to their weight proportions:

[0034] 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 modifier filler.

[0035] The above raw materials are mixed in a mixer at a speed of 110-120 r / min for 40-50 min at a temperature of 80-85℃. After mixing, the release modifier is obtained.

[0036] Step 2: Select PET film as the base film, spray ink layer on the base film, plate embossed layer on the top of ink layer, coat release modifier on embossed layer to form release coating, and set polypropylene protective layer on release coating;

[0037] Step 3: The bottom of the substrate film is set with EVA hot melt adhesive. By heating the EVA hot melt adhesive, the heat transfer film is attached to the target material.

[0038] The preparation method of the modified filler in this embodiment is as follows:

[0039] 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 solution;

[0040] S2: Add 3-5 parts of flake talc powder and 5-8 parts of modified whisker agent to 6-10 parts of silane coupling liquid and stir thoroughly to obtain modified filler.

[0041] Preferably, the method for preparing the flake talc powder is as follows:

[0042] S11: Stir flake talc powder in a sufficient amount of sodium citrate solution to obtain flake talc liquid;

[0043] S12: Immerse the nano-silica sol in a sodium silicate solution that is 3-5 times the total volume of the nano-silica sol and stir until homogeneous to obtain modified silica sol;

[0044] S13: Add 2-5 parts alginic acid and 1-3 parts carboxymethyl cellulose to 5-8 parts of flake talc liquid, then add 2-4 parts modified silica sol, ball mill thoroughly, filter, and dry to obtain flake talc powder.

[0045] In this embodiment, the sodium citrate solution has a mass fraction of 2-5%; the sodium silicate solution has a mass fraction of 3-6%.

[0046] In this embodiment, the ball milling speed is 1500 r / min, and the stirring time is 1-2 h.

[0047] The preparation method of the modified whisker agent in this embodiment is as follows:

[0048] S101: Stir silicon carbide whiskers thoroughly in a sufficient amount of hydrogen peroxide solution, then wash with water, filter, and dry to obtain silicon carbide whisker agent;

[0049] S102: Mix 2-5 parts of silicon carbide whisker agent, 3-6 parts of 5% yttrium nitrate solution, and 4-7 parts of sodium dodecylbenzenesulfonate solution thoroughly, then wash with water, filter, and dry to obtain modified whisker agent.

[0050] The sodium dodecylbenzenesulfonate solution in this embodiment has a mass fraction of 2-5%.

[0051] The mass fraction of the hydrogen peroxide solution in this embodiment is 2-4%.

[0052] This embodiment describes a method for preparing a heat transfer film.

[0053] Example 1.

[0054] This embodiment of a method for preparing a heat transfer film includes the following steps:

[0055] Step 1: Preparation of release modifier:

[0056] Weigh the raw materials according to their weight proportions:

[0057] 30 parts of waterborne styrene maleic anhydride resin, 20 parts of vinyl silicone oil, 10 parts of paraffin, 35 parts of water, 2 parts of fatty alcohol polyoxyethylene ether, 2 parts of pentaerythritol fatty acid ester and 5 parts of modified filler.

[0058] The above raw materials were mixed in a mixer at a speed of 110 r / min for 40 min at a temperature of 80℃. After mixing, the release modifier was obtained.

[0059] Step 2: Select PET film as the base film, spray ink layer on the base film, plate embossed layer on the top of ink layer, coat release modifier on embossed layer to form release coating, and set polypropylene protective layer on release coating;

[0060] Step 3: The bottom of the substrate film is set with EVA hot melt adhesive. By heating the EVA hot melt adhesive, the heat transfer film is attached to the target material.

[0061] The preparation method of the modified filler in this embodiment is as follows:

[0062] S1: Mix 3 parts of silane coupling agent KH550, 1 part of ethanol and 4 parts of water thoroughly to obtain a silane coupling solution;

[0063] S2: Add 3 parts of flake talc powder and 5 parts of modified whisker agent to 6 parts of silane coupling liquid and stir thoroughly to obtain modified filler.

[0064] Preferably, the method for preparing the flake talc powder is as follows:

[0065] S11: Stir flake talc powder in a sufficient amount of sodium citrate solution to obtain flake talc liquid;

[0066] S12: Immerse the nano-silica sol in a sodium silicate solution with a volume of 3 times that of the nano-silica sol and stir until homogeneous to obtain modified silica sol;

[0067] S13: 2 parts alginic acid and 1 part carboxymethyl cellulose were added to 5 parts flaky talc liquid, followed by 2 parts modified silica sol. The mixture was ball-milled thoroughly, filtered, and dried to obtain flaky talc powder.

[0068] In this embodiment, the sodium citrate solution has a mass fraction of 2%; the sodium silicate solution has a mass fraction of 3%.

[0069] In this embodiment, the ball milling speed is 1500 r / min, and the stirring time is 1 h.

[0070] The preparation method of the modified whisker agent in this embodiment is as follows:

[0071] S101: Stir silicon carbide whiskers thoroughly in a sufficient amount of hydrogen peroxide solution, then wash with water, filter, and dry to obtain silicon carbide whisker agent;

[0072] S102: Mix 2 parts of silicon carbide whisker agent, 3 parts of 5% yttrium nitrate solution and 4 parts of sodium dodecylbenzenesulfonate solution thoroughly, then wash with water, filter and dry to obtain modified whisker agent.

[0073] The sodium dodecylbenzenesulfonate solution in this embodiment has a mass fraction of 2%.

[0074] The mass fraction of the hydrogen peroxide solution in this embodiment is 2%.

[0075] This embodiment describes a method for preparing a heat transfer film.

[0076] Example 2.

[0077] This embodiment of a method for preparing a heat transfer film includes the following steps:

[0078] Step 1: Preparation of release modifier:

[0079] Weigh the raw materials according to their weight proportions:

[0080] The mixture consists of 35 parts of waterborne 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.

[0081] The above raw materials were mixed in a mixer at a speed of 120 r / min for 50 min at a temperature of 85℃. After mixing, the release modifier was obtained.

[0082] Step 2: Select PET film as the base film, spray ink layer on the base film, plate embossed layer on the top of ink layer, coat release modifier on embossed layer to form release coating, and set polypropylene protective layer on release coating;

[0083] Step 3: The bottom of the substrate film is set with EVA hot melt adhesive. By heating the EVA hot melt adhesive, the heat transfer film is attached to the target material.

[0084] The preparation method of the modified filler in this embodiment is as follows:

[0085] S1: Mix 5 parts of silane coupling agent KH550, 3 parts of ethanol and 7 parts of water thoroughly to obtain a silane coupling solution;

[0086] S2: 5 parts of flake talc powder and 8 parts of modified whisker agent are added to 10 parts of silane coupling liquid and stirred thoroughly to obtain the modified filler.

[0087] Preferably, the method for preparing the flake talc powder is as follows:

[0088] S11: Stir flake talc powder in a sufficient amount of sodium citrate solution to obtain flake talc liquid;

[0089] S12: Immerse the nano-silica sol in a sodium silicate solution that is 5 times the total volume of the nano-silica sol and stir until homogeneous to obtain modified silica sol;

[0090] S13: 5 parts alginic acid and 3 parts carboxymethyl cellulose were added to 8 parts of flake talc liquid, followed by 4 parts of modified silica sol. The mixture was ball-milled thoroughly, filtered, and dried to obtain flake talc powder.

[0091] In this embodiment, the sodium citrate solution has a mass fraction of 5%; the sodium silicate solution has a mass fraction of 6%.

[0092] In this embodiment, the ball milling speed is 1500 r / min, and the stirring time is 1-2 h.

[0093] The preparation method of the modified whisker agent in this embodiment is as follows:

[0094] S101: Stir silicon carbide whiskers thoroughly in a sufficient amount of hydrogen peroxide solution, then wash with water, filter, and dry to obtain silicon carbide whisker agent;

[0095] S102: Mix 5 parts of silicon carbide whisker agent, 6 parts of 5% yttrium nitrate solution and 7 parts of sodium dodecylbenzenesulfonate solution thoroughly, then wash with water, filter and dry to obtain modified whisker agent.

[0096] The sodium dodecylbenzenesulfonate solution in this embodiment has a mass fraction of 5%.

[0097] The mass fraction of the hydrogen peroxide solution in this embodiment is 4%.

[0098] This embodiment describes a method for preparing a heat transfer film.

[0099] Example 3.

[0100] This embodiment of a method for preparing a heat transfer film includes the following steps:

[0101] Step 1: Preparation of release modifier:

[0102] Weigh the raw materials according to their weight proportions:

[0103] The composition includes 32.5 parts of waterborne 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 modified filler.

[0104] The above raw materials were mixed in a mixer at a speed of 115 r / min for 45 min at a temperature of 82℃. After mixing, the release modifier was obtained.

[0105] Step 2: Select PET film as the base film, spray ink layer on the base film, plate embossed layer on the top of ink layer, coat release modifier on embossed layer to form release coating, and set polypropylene protective layer on release coating;

[0106] Step 3: The bottom of the substrate film is set with EVA hot melt adhesive. By heating the EVA hot melt adhesive, the heat transfer film is attached to the target material.

[0107] The preparation method of the modified filler in this embodiment is as follows:

[0108] S1: Mix 4 parts of silane coupling agent KH550, 2 parts of ethanol and 5.5 parts of water thoroughly to obtain a silane coupling solution;

[0109] S2: 4 parts of flake talc powder and 6.5 parts of modified whisker agent are added to 8 parts of silane coupling liquid and stirred thoroughly to obtain the modified filler.

[0110] Preferably, the method for preparing the flake talc powder is as follows:

[0111] S11: Stir flake talc powder in a sufficient amount of sodium citrate solution to obtain flake talc liquid;

[0112] S12: The modified silica sol is obtained by immersing the nano silica sol in a sodium silicate solution with a volume of 4 times that of the nano silica sol and stirring until homogeneous.

[0113] S13: 3.5 parts alginic acid and 2 parts carboxymethyl cellulose were added to 6.5 parts flaky talc liquid, followed by 3 parts modified silica sol. The mixture was ball-milled thoroughly, filtered, and dried to obtain flaky talc powder.

[0114] In this embodiment, the sodium citrate solution has a mass fraction of 3.5%; the sodium silicate solution has a mass fraction of 4.5%.

[0115] In this embodiment, the ball milling speed is 1500 r / min, and the stirring time is 1.5 h.

[0116] The preparation method of the modified whisker agent in this embodiment is as follows:

[0117] S101: Stir silicon carbide whiskers thoroughly in a sufficient amount of hydrogen peroxide solution, then wash with water, filter, and dry to obtain silicon carbide whisker agent;

[0118] S102: Mix 3.5 parts of silicon carbide whisker agent, 4.5 parts of 5% yttrium nitrate solution and 5.5 parts of sodium dodecylbenzenesulfonate solution thoroughly, then wash with water, filter and dry to obtain modified whisker agent.

[0119] The sodium dodecylbenzenesulfonate solution in this embodiment has a mass fraction of 3.5%.

[0120] The hydrogen peroxide solution in this embodiment has a mass fraction of 3%.

[0121] This embodiment describes a method for preparing a heat transfer film.

[0122] Comparative Example 1.

[0123] Unlike Example 3, no modified filler was added.

[0124] Comparative Example 2.

[0125] Unlike Example 3, no flake talc powder was added to the modified filler.

[0126] Comparative Example 3.

[0127] Unlike Example 3, no modified silica sol was added during the preparation of the flake talc powder.

[0128] Comparative Example 4.

[0129] Unlike Example 3, no modified whisker agent was added.

[0130] Comparative Example 5.

[0131] Unlike Example 3, the modified whisker agent is replaced with silicon carbide whiskers.

[0132] The product performance tests for Examples 1-3 and Comparative Examples 1-5 are as follows: The products were placed at 65°C for 12 hours, and then placed under 2% hydrochloric acid mist conditions for 12 hours. The high temperature resistance and acid corrosion stability of the products were tested, and the tests are as follows:

[0133]

[0134] As can be seen from Comparative Examples 1-5 and Example 3, the products in the examples have a synergistic effect of low peeling and high adhesion, and at the same time, the products have significant effects in acid corrosion resistance and high temperature stability.

[0135] The product performance deteriorates significantly when no modified filler is added in this invention. Furthermore, the product performance deteriorates significantly when no flake talc powder or modified whisker agent is added in the modified filler. Additionally, the product performance deteriorates when no modified silica sol is added in the preparation of the flake talc powder or when silicon carbide whiskers are used instead of modified whisker agents. Only the product raw materials obtained by the method of this invention have the most significant performance improvement.

[0136] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0137] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider 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 heat transfer film, characterized in that, Includes the following steps: Step 1: Preparation of release modifier: Weigh the raw materials according to their weight proportions: 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 modifier filler. The above raw materials are mixed in a mixer at a speed of 110-120 r / min for 40-50 min at a temperature of 80-85℃. After mixing, the release modifier is obtained. Step 2: Select PET film as the base film, spray ink layer on the base film, plate embossed layer on the top of ink layer, coat release modifier on embossed layer to form release coating, and set polypropylene protective layer on release coating; Step 3: The bottom of the substrate film is coated with EVA hot melt adhesive. By heating the EVA hot melt adhesive, the heat transfer film is attached to the target material. The preparation method of the modified filler is as follows: 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 solution; S2: 3-5 parts of flake talc powder and 5-8 parts of modified whisker agent are added to 6-10 parts of silane coupling liquid and stirred thoroughly to obtain a modified filler; the preparation method of the flake talc powder is as follows: S11: Stir flake talc powder in a sufficient amount of sodium citrate solution to obtain flake talc liquid; S12: Immerse the nano-silica sol in a sodium silicate solution that is 3-5 times the total volume of the nano-silica sol and stir until homogeneous to obtain modified silica sol; S13: 2-5 parts alginic acid and 1-3 parts carboxymethyl cellulose are added to 5-8 parts of flake talc solution, followed by 2-4 parts modified silica sol. The mixture is ball-milled thoroughly, filtered, and dried to obtain flake talc powder. The preparation method of the modified whisker agent is as follows: S101: Stir silicon carbide whiskers thoroughly in a sufficient amount of hydrogen peroxide solution, then wash with water, filter, and dry to obtain silicon carbide whisker agent; S102: Mix 2-5 parts of silicon carbide whisker agent, 3-6 parts of 5% yttrium nitrate solution, and 4-7 parts of sodium dodecylbenzenesulfonate solution thoroughly, then wash with water, filter, and dry to obtain modified whisker agent.

2. The method for preparing a heat transfer film according to claim 1, characterized in that, The sodium citrate solution has a mass fraction of 2-5%; the sodium silicate solution has a mass fraction of 3-6%.

3. The method for preparing a heat transfer film according to claim 2, characterized in that, The ball milling process is carried out at a speed of 1500 r / min for 1-2 hours.

4. The method for preparing a heat transfer film according to claim 3, characterized in that, The sodium dodecylbenzenesulfonate solution has a mass fraction of 2-5%.

5. The method for preparing a heat transfer film according to claim 4, characterized in that, The hydrogen peroxide solution has a mass fraction of 2-4%.

6. A heat transfer film prepared by the method of any one of claims 1-5.

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