Laser printing carbon powder transfer liquid and preparation method and application thereof

Abstract

The application relates to the technical field of printing transfer technology, in particular to a laser printing carbon powder transfer liquid as well as a preparation method and application thereof. The laser printing carbon powder transfer liquid contains the following components in percentage by volume: 82-92% of methyl salicylate; and 8-18% of plant essential oil. Through the synergistic effect of the specific proportion of methyl salicylate and plant essential oil, the application solves the technical problems of existing transfer liquid, such as transfer blur, too fast volatilization, pungent smell, high toxicity and the like. The transfer liquid has the advantages of high transfer clarity, moderate volatilization speed, pleasant smell, low toxicity, good stability and the like, and is particularly suitable for fine pattern transfer of various materials such as jade, bamboo, wood, metal, ceramic and the like.

Description

Technical Field

[0001] This application relates to the field of printing transfer technology, and in particular to a laser printing toner transfer solution, its preparation method, and its application. Background Technology

[0002] In fields such as seal engraving, antique carving, and handicrafts, it is often necessary to transfer designed patterns or text onto the surface of materials such as jade, bamboo, wood, and metal as reference lines for carving or processing. Currently, the common method is to use a laser printer to print the pattern, and then transfer toner from the paper to the surface of the target object using a transfer solution.

[0003] In existing technologies, transfer solutions mainly have the following problems:

[0004] Highly toxic and with poor safety: Most transfer solutions on the market currently use acetone as the main solvent. Although acetone has some ability to dissolve toner, it is extremely volatile (boiling point 56℃), and long-term exposure can damage the human nervous and respiratory systems. It is also flammable and explosive, posing safety hazards during storage and use.

[0005] Poor transfer effect: Some products use turpentine, eucalyptus oil, etc. as transfer solutions, but these solvents have poor solubility for laser printing toner, resulting in blurry, broken lines, and missing colors in the transferred pattern, which cannot meet the requirements of fine engraving. In particular, eucalyptus oil contains a large amount of menthol, camphor, and other ingredients, which will form an oil film on the surface of the object and hinder the adhesion of toner.

[0006] Rapid evaporation and short operating window: Acetone-based transfer solutions evaporate too quickly, requiring operators to complete the transfer process in a very short time. Otherwise, the toner cannot be transferred after the solvent evaporates, resulting in a low success rate and wasted materials.

[0007] Pungent odor and poor user experience: Although alternative products such as safflower oil have lower toxicity, their strong and persistent odor can cause serious odor pollution when used indoors, affecting the comfort and work efficiency of operators.

[0008] Poor stability: Existing transfer solutions are prone to problems such as layering, discoloration, and decomposition of active ingredients during storage, resulting in unstable transfer effects and large batch-to-batch differences.

[0009] Therefore, there is an urgent need in this field for a new type of transfer liquid that has high transfer clarity, moderate evaporation rate, pleasant odor, low toxicity, and good stability.

[0010] Application content

[0011] To address the technical problems of high toxicity, poor transfer effect, rapid evaporation, pungent odor, and poor stability of existing transfer solutions, this application provides a laser printing toner transfer solution, its preparation method, and its application.

[0012] In a first aspect, this application provides a laser printing toner transfer solution, which adopts the following technical solution:

[0013] A laser printing toner transfer solution, comprising the following components by volume percentage:

[0014] Methyl salicylate 82-92%;

[0015] Plant essential oils 8-18%.

[0016] By adopting the above technical solution, methyl salicylate, as the main solvent, has a specific dissolving ability for toner. Laser printing toner is mainly composed of polyester resin, pigments, charge control agents, etc. The ester structure of methyl salicylate can form hydrogen bonds and van der Waals forces with polyester resin, effectively softening and dissolving toner particles, allowing them to detach from the paper surface and transfer to the target object. Compared with acetone, methyl salicylate has a moderate dissolution rate, preventing toner diffusion due to excessively rapid dissolution, thus ensuring the clarity of the transferred pattern.

[0017] Suitable evaporation rate. The evaporation rate of methyl salicylate at 25°C is significantly lower than that of acetone. This characteristic provides operators with an ample operating time window (approximately 2-5 minutes) without causing excessively long drying times due to slow evaporation, thus avoiding impacting work efficiency.

[0018] Low toxicity. Methyl salicylate is a major component of wintergreen oil, a natural plant, and is widely used in the pharmaceutical field as a topical analgesic and anti-inflammatory agent. Its acute dermal toxicity LD50 is >5000 mg / kg, classifying it as a low-toxicity substance, far lower than acetone (LD50 approximately 2000 mg / kg). When used in well-ventilated environments, it poses minimal harm to the human body.

[0019] However, using methyl salicylate alone has the following problems: it has a special herbal odor that some users find unacceptable; although its evaporation rate is slower than that of acetone, it is still relatively fast, and the operating window is shortened in hot environments; it has a high surface tension and poor wettability on some low surface energy materials (such as certain jade).

[0020] Therefore, this application incorporates a specific proportion of plant essential oils to create a synergistic effect:

[0021] Odor modulation and sustained-release effects. Plant essential oils (such as magnolia essential oil and lavender essential oil) contain volatile aromatic components such as terpenes, alcohols, and esters, which can effectively mask the herbal odor of methyl salicylate, providing a pleasant user experience. More importantly, the essential oils and methyl salicylate form an azeotropic system, which, through intermolecular interactions (such as hydrogen bonding and π-π stacking), slows down the overall evaporation rate, extending the operating window to 3-8 minutes.

[0022] Surface tension optimization. The surface tension of plant essential oils is usually below 25 mN / m. Adding them can reduce the overall surface tension of the transfer solution, improve its spreadability and wettability on various material surfaces, and enable the transfer solution to cover the target surface more evenly, thereby improving the transfer quality.

[0023] Antioxidant and stability enhancement. The natural antioxidants (such as phenolic compounds) in plant essential oils can inhibit the oxidative decomposition of methyl salicylate, thus prolonging the storage stability of the transfer solution.

[0024] Furthermore, the volume ratio of methyl salicylate to plant essential oil is (5-7):1.

[0025] By adopting the above technical solution, this ratio range ensures the synergistic effect of the solvent and essential oil, maintaining good solubility for the toner while avoiding excessive viscosity or slow evaporation of the transfer solution due to excessive essential oil. The transfer solution within this ratio range maintains a stable evaporation rate under different ambient temperatures, demonstrating strong adaptability.

[0026] Furthermore, by volume percentage, it includes:

[0027] Methyl salicylate 85%;

[0028] 15% plant essential oils.

[0029] Furthermore, the plant essential oil is one or more of the following: magnolia essential oil, lavender essential oil, and tea tree essential oil.

[0030] By adopting the above technical solutions, different essential oils have different volatilization rates, aromas, and antibacterial properties, which can be selected or compounded according to the application scenario to improve the applicability of the product.

[0031] All are extracted from natural plants, conforming to the trend of green environmental protection and reducing the stimulation to human body and environment.

[0032] Furthermore, the plant essential oil is a mixture of magnolia essential oil and lavender essential oil in a volume ratio of (2-3):1.

[0033] By employing the above technical solution, the fragrance of magnolia is rich and long-lasting, while lavender is fresh and soothing. The combination of the two creates a pleasant aroma and enhances the user experience. Since the two essential oils have different evaporation rates, the combination allows for fine-tuning of the overall evaporation rate, preventing it from being too fast or too slow.

[0034] Furthermore, it also contains 0.5-2% of a sustained-release film-forming agent, which is selected from one or more of ethyl cellulose, hydroxypropyl methylcellulose or polyvinylpyrrolidone. The sustained-release film-forming agent is an additional addition, and the volume percentage of each component is calculated based on the total volume of the transfer solution.

[0035] By adopting the above technical solutions, the film-forming agent can form a thin film on the surface of the transfer liquid, slow down the solvent evaporation rate, and extend the operation time; it helps the toner to adhere better to the target surface, improving the clarity and durability of the pattern; some film-forming agents also have emulsification stabilizing effects, preventing component stratification and improving storage stability.

[0036] Secondly, this application provides a method for preparing laser printing toner transfer solution, which adopts the following technical solution:

[0037] A method for preparing laser printing toner transfer solution includes the following steps:

[0038] (1) Place methyl salicylate in a container and control the temperature at 15-25℃;

[0039] (2) Under stirring at 400 rpm, slowly add plant essential oil and optional slow-release film-forming agent for 10-20 minutes;

[0040] (3) Let stand for 20-30 minutes to defoam and obtain the transfer solution.

[0041] By employing the above technical solution, the preparation conditions are mild, and low-temperature stirring prevents volatile and heat-sensitive components from decomposing, thus ensuring component activity. Controlling the rotation speed and stirring time ensures thorough mixing of all components, avoiding uneven local concentrations. Static defoaming prevents air bubbles from affecting the transfer effect, improving product quality.

[0042] Furthermore, the sustained-release film-forming agent in (2) is first pre-dissolved in part of the methyl salicylate in (1) before being added.

[0043] By adopting the above technical solution, the film-forming agent can be directly added to prevent clumping. After pre-dissolving, the dispersion is more uniform, avoiding local over-concentration. Pre-dissolving can accelerate the overall dissolution process and shorten the preparation time.

[0044] Thirdly, this application provides an application of laser printing toner transfer solution in laser printing toner transfer, employing the following technical solution:

[0045] An application of a laser printing toner transfer solution in laser printing toner transfer, the application including transferring patterns printed by laser printer toner onto the surface of jade, bamboo, wood, tree seeds, seed kernels, ivory, metal, pottery, porcelain or purple clay ware.

[0046] Furthermore, the specific steps for the transfer are as follows:

[0047] S1. Apply the transfer solution evenly to the surface of the object to be transferred, with an application amount of 0.05-0.15 mL / cm2;

[0048] S2. Cover the surface coated with transfer liquid with the laser-printed toner pattern paper, apply pressure of 0.1-0.3MPa, and hold for 10-30 seconds;

[0049] S3. Remove the paper to complete the transfer.

[0050] By adopting the above technical solution, the transfer can be completed with moderate pressure and short holding time, improving efficiency and avoiding blurring of the pattern due to excessive wetting.

[0051] In summary, this application has the following beneficial effects:

[0052] The transfer solution of this application has excellent dissolving and transfer capabilities for toner, resulting in clear lines, sharp edges, and no broken lines or missing colors in the transferred pattern. It can meet the transfer requirements for fine lines of 0.1mm or more.

[0053] With a moderate evaporation rate and an operating window of 3-8 minutes, operators have ample time for alignment, pressing, and other operations, resulting in a transfer success rate of >98%.

[0054] The fragrance is pleasant; the plant essential oils give the transfer liquid a delicate floral scent, with no pungent odor, and it is comfortable to use indoors.

[0055] It has low toxicity and high safety. Its main components are natural plant extracts. It has low acute toxicity, is not flammable or explosive, and is safe to store and use.

[0056] It has good stability, a shelf life of more than 12 months, does not separate or deteriorate, and the transfer effect is stable and reliable.

[0057] It has wide applicability and can transfer images well on a variety of materials such as jade, bamboo, wood, metal, and ceramics. Attached Figure Description

[0058] Figure 1 The image shows the transfer effect of the transfer liquid in Example 1 on a 0.5mm line pattern on stone.

[0059] Figure 2-5 The images show the transfer effects of the transfer liquids used in Comparative Examples 1-4 on 1mm line patterns on wood. Detailed Implementation

[0060] The present application will be further described in detail below with reference to the embodiments.

[0061] raw material

[0062] It should be noted that: unless otherwise specified, the following examples shall be carried out under conventional conditions or conditions recommended by the manufacturer, and the raw materials used in the following examples shall be commercially available unless otherwise specified.

[0063] Example

[0064] Example 1

[0065] A laser printer toner transfer solution, the preparation method of which is as follows:

[0066] (1) Place 85 mL of methyl salicylate in a container and control the temperature at 20 °C;

[0067] (2) Add 15 mL of magnolia essential oil slowly while stirring at 400 rpm for 15 minutes;

[0068] (3) Let stand for 20 minutes to defoam and obtain the transfer solution.

[0069] Example 2

[0070] Unlike Example 1, Example 2 uses 82 mL of methyl salicylate, 9 mL of lavender essential oil, and 9 mL of magnolia essential oil.

[0071] Example 3

[0072] Unlike Example 1, Example 3 uses 90 mL of methyl salicylate and 10 mL of lavender essential oil.

[0073] Example 4

[0074] Unlike Example 1, Example 4 uses 88 mL of methyl salicylate and 12 mL of tea tree oil.

[0075] Example 5

[0076] (1) Place 85 mL of methyl salicylate in a container and control the temperature at 20 °C;

[0077] (2) Take 5 mL of methyl salicylate from (1) and dissolve 1 mL of ethyl cellulose. Then, under stirring at 400 rpm, slowly add 15 mL of magnolia essential oil and the above ethyl cellulose for 20 minutes.

[0078] (3) Let stand for 20 minutes to defoam and obtain the transfer solution.

[0079] Comparative Example

[0080] Comparative Example 1

[0081] Pure acetone was used as the transfer solution.

[0082] Comparative Example 2

[0083] Use commercially available turpentine as the transfer solution.

[0084] Comparative Example 3

[0085] Commercially available safflower oil was used as the transfer solution.

[0086] Comparative Example 4

[0087] 100% methyl salicylate is used as the transfer solution, and no fragrance oil is added.

[0088] Performance testing

[0089] The transfer solutions obtained in the examples and comparative examples were subjected to the following performance tests.

[0090] I. Evaporation Rate Test

[0091] At 25℃ and 50% relative humidity, 10 mL of transfer solution was placed in an open petri dish with a diameter of 5 cm, and the evaporation rate was calculated by weighing the solution every hour. The results are shown in Table 1.

[0092] Table 1. Results of evaporation rate test

[0093] <![CDATA[Volatile rate (g / (cm 2 ·h))]]> Complete evaporation time Example 1 0.12 Approximately 4 hours Example 2 0.10 Approximately 5 hours Example 3 0.08 Approximately 6 hours Example 4 0.11 Approximately 4.5 hours Example 5 0.09 Approximately 5.5 hours Comparative Example 1 0.58 Approximately 45 minutes Comparative Example 2 0.35 Approximately 1.5 hours Comparative Example 3 0.05 Approximately 10 hours Comparative Example 4 0.18 Approximately 2.5 hours

[0094] It can be seen that the evaporation rate of the transfer solution in this application is moderate (0.08-0.15 g / (cm³)). 2 This method avoids both the excessively rapid evaporation of acetone and the excessively slow drying of safflower oil.

[0095] II. Transfer Sharpness Test

[0096] Test patterns containing lines of 0.1mm, 0.2mm, 0.5mm, and 1.0mm were printed using a laser printer. The patterns were then transferred to the surfaces of stone, wood, and brass using different transfer solutions. The transfer effect was observed, and each material was tested three times, with the average value taken.

[0097] The transfer method is as follows:

[0098] S1. Apply the transfer solution evenly to the surface of the object to be transferred, with a coating amount of 0.1 mL / cm². 2 ;

[0099] S2. Cover the surface coated with transfer liquid with the laser-printed toner pattern paper, apply a pressure of 0.2 MPa, and hold for 20 seconds;

[0100] S3. Remove the paper to complete the transfer.

[0101] Scoring criteria:

[0102] 5 points: The lines are clear and complete, with no breaks or spread;

[0103] 4 points: The lines are mostly complete, with a few minor breaks;

[0104] 3 points: The lines are broken or slightly diffused;

[0105] 2 points: The lines are obviously broken or spread out;

[0106] 1 point: Pattern cannot be identified.

[0107] The results are shown in Table 2.

[0108] Table 2 Results of Transfer Sharpness Test

[0109] Qingtian Stone bamboo strips brass plate Example 1 4.8 4.7 4.5 Example 2 4.7 4.6 4.4 Example 3 4.9 4.8 4.6 Example 4 4.6 4.5 4.3 Example 5 5.0 4.9 4.8 Comparative Example 1 3.5 3.2 3.0 Comparative Example 2 2.8 2.5 2.0 Comparative Example 3 3.0 2.8 2.5 Comparative Example 4 4.2 4.0 3.8

[0110] It can be seen that the transfer clarity of the transfer liquid in this application is significantly better than that of the prior art. Specifically, the transfer effect of 0.5mm line patterns on stone in Example 1 and Comparative Examples 1-4 is shown in [example description missing]. Figure 1-5 .

[0111] III. Operation Window Test

[0112] After applying the transfer solution, wait 1 minute, 3 minutes, 5 minutes, 8 minutes, and 10 minutes before performing the transfer operation. The transfer success rate was calculated, and a transfer integrity of >90% was considered successful. The results are shown in Table 3.

[0113] Table 3 Test Results of the Operation Window

[0114] 1min / % 3min / % 5min / % 8min / % 10min / % Example 1 100 100 98 95 60 Example 3 100 100 100 95 80 Example 5 100 100 100 98 90 Comparative Example 1 100 60 20 0 0 Comparative Example 4 100 90 70 40 10

[0115] The results showed that the effective operating window of the transfer solution in this application was 3-8 minutes, which was significantly better than acetone (<1 minute) and methyl salicylate alone (<3 minutes).

[0116] IV. Stability Testing

[0117] Each transfer solution was sealed and stored at 25℃ in the dark. The content of active ingredients and the transfer effect were tested periodically. Acceptance criteria: Appearance: Clear and transparent liquid, no layering, no sedimentation, no discoloration (color ≤ 50 Hazen); Active ingredient content: Methyl salicylate content ≥ 95% of the initial content (determined by gas chromatography); Transfer effect score: Transfer clarity score ≥ 4.0 points (out of 5). Results are shown in Table 4.

[0118] Table 4 Stability test results

[0119] initial 3 months 6 months 12 months Example 1 qualified qualified qualified qualified Example 3 qualified qualified qualified qualified Comparative Example 4 qualified qualified Slight decomposition Obvious decomposition

[0120] The results showed that the storage stability of the transfer solution of this application with added plant essential oils was significantly better than that of methyl salicylate alone.

[0121] V. Odor Evaluation Test

[0122] Ten volunteers were invited to rate the smell of the transfer solution, with 5 points being very pleasant and 1 point being very pungent; the results are shown in Table 5.

[0123] Table 5 Odor Evaluation Results

[0124] Average rating evaluate Example 1 4.5 A delicate floral fragrance, soothing Example 2 4.3 A complex floral fragrance, very pleasant. Example 3 4.6 Lavender scent, soothing Comparative Example 1 1.2 Strong, pungent odor Comparative Example 3 2.0 Strong medicinal smell, lingering for a long time Comparative Example 4 2.5 Herbal taste, acceptable but not pleasant.

[0125] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A laser printing toner transfer solution, characterized in that, By volume percentage, it contains the following components: Methyl salicylate 82-92%; Plant essential oils 8-18%.

2. The laser printing toner transfer solution according to claim 1, characterized in that, The volume ratio of methyl salicylate to plant essential oil is (5-7):

1.

3. The laser printing toner transfer solution according to claim 1, characterized in that, By volume percentage, it includes: Methyl salicylate 85%; 15% plant essential oils.

4. The laser printing toner transfer solution according to claim 1, characterized in that, The plant essential oil is one or more of the following: magnolia essential oil, lavender essential oil, and tea tree essential oil.

5. The laser printing toner transfer solution according to claim 1, characterized in that, The plant essential oil is a mixture of magnolia essential oil and lavender essential oil in a volume ratio of (2-3):

1.

6. The laser printing toner transfer solution according to claim 1, characterized in that, It also contains 0.5-2% of a sustained-release film-forming agent, which is selected from one or more of ethyl cellulose, hydroxypropyl methylcellulose or polyvinylpyrrolidone. The sustained-release film-forming agent is an additional addition, and the volume percentage of each component is calculated based on the total volume of the transfer solution.

7. A method for preparing laser printing toner transfer solution as described in any one of claims 1-6, characterized in that, Includes the following steps: (1) Place methyl salicylate in a container and control the temperature at 15-25℃; (2) Under stirring conditions of 400 rpm, slowly add plant essential oil and optional slow-release film-forming agent, and stir for 10-20 minutes; (3) Let stand for 20-30 minutes to defoam and obtain the transfer solution.

8. The method for preparing laser printing toner transfer solution according to claim 7, characterized in that, The sustained-release film-forming agent in (2) is first pre-dissolved in part of the methyl salicylate in (1) before being added.

9. An application of the laser printing toner transfer solution as described in any one of claims 1-6 in laser printing toner transfer, characterized in that, The applications include transferring patterns printed with laser printer toner onto the surfaces of jade, bamboo, wood, seeds, kernels, ivory, metal, pottery, porcelain, or purple clay teapots.

10. The application of the laser printing toner transfer solution according to claim 9 in laser printing toner transfer, characterized in that, The specific steps for the transfer are as follows: S1. Apply the transfer solution evenly to the surface of the object to be transferred, with an application rate of 0.05-0.15 mL / cm². 2 ; S2. Cover the surface coated with transfer liquid with the laser-printed toner pattern paper, apply pressure of 0.1-0.3MPa, and hold for 10-30 seconds; S3. Remove the paper to complete the transfer.

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