UV varnish for laser and preparation method and application thereof

Abstract

The application belongs to the technical field of UV varnish and specifically relates to a UV varnish for laser, a preparation method and application thereof. The UV varnish for laser comprises the following components in percentage by mass: polar monomer 40-50%, dilution monomer 15-30%, blending resin 5-15%, photoinitiator 8-13%, thixotropic agent 0.15-0.3%, wetting agent 0.1-0.2%, leveling agent 0.1-0.3%, defoaming agent 0.05-0.1%, antioxidant 0.05-0.1% and adhesion promoter 0.3-1%. The UV varnish of the application can save the film coating step in the process, improve the production efficiency, reduce the production cost, achieve the high gloss effect equivalent to the film coating process, and can also give the laser powder high surface energy and high gloss effect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of UV varnish and specifically relates to a UV varnish for laser, a preparation method and application thereof. BACKGROUND

[0002] The UV varnish for laser is a special functional coating specially used for laser printing or surface treatment of laser packaging materials and belongs to a kind of ultraviolet curing (UV) ink / coating. It is widely used in the packaging printing of high-grade tobacco and wine, cosmetics, gift boxes, labels and other products, for improving the appearance and texture of the products and realizing special visual anti-counterfeiting and decoration functions in combination with the laser effect.

[0003] Most of the materials commonly used in UV varnish are ester substances synthesized from acrylic acid and epoxy, polyester, polyurethane and other materials. In addition to double bonds, the main functional groups thereof are ester groups, which have lower polarity than hydroxyl groups and carboxyl groups. The surface energy of the cured product is also low, and the surface energy value is usually only 36-40. If a ketone photoinitiator with relatively high polarity and other additives with relatively high polarity are not used, the surface energy value of the cured product will be even lower. When the laser powder is made, the surface tension of the conventional UV monomer is 30-40, and the difference between the surface tension of the monomer and the surface energy of the UV coating is not large, which will slow down the wetting speed of the laser powder in the UV decorative coating, and more wetting agents need to be added to the decorative coating to reduce the surface tension to obtain better wetting effect. After physical mixing, compared with other powder materials such as matte powder and color powder, the laser powder has a larger size and mass, and is prone to sedimentation and stratification after long-term storage.

[0004] The surface of the UV varnish after curing needs to be plated with aluminum to achieve the laser effect. Compared with water-based or oil-based coatings, the surface of the UV varnish after curing is more dense, which is not conducive to the plating of aluminum. In addition, the surface tension of the cured product is low, which is another unfavorable factor. Even if the surface tension is temporarily increased to 46-52 through corona treatment, the plating fastness can be improved in the short term, but the surface tension will decrease significantly after aging, and the plating fastness will also decrease significantly.

[0005] The UV oil for laser needs to achieve high gloss after curing, and the conventional UV is difficult to have good leveling effect after coating, and it is also difficult to obtain high gloss effect after curing. In order to solve the problem, the process needs to be laminated after coating the UV oil, and the smooth surface of the film makes the cured UV coating also obtain high gloss effect. This process not only causes a large amount of waste of release film, but also makes the process more laminated, greatly reducing the production efficiency. In addition, the molecular weight (Mw=750-3000) of most UV resins is usually larger than that of UV monomers (Mw=150-500) and the viscosity is higher. If the resin is modified with polar functional groups such as hydroxyl or isocyanate, the polarity is improved, and the viscosity is also greatly improved, and the leveling flowability is far worse than that of polar monomers.

[0006] In view of the above problems existing in the actual production of the UV oil, in order to save the film coating step in the process, improve the production efficiency, reduce the production cost, and realize the high gloss effect equivalent to the film coating process, a self-leveling UV oil with high surface energy, high gloss and easy construction is needed. SUMMARY

[0007] The purpose of the present application is to provide a UV oil for laser and its preparation method and application.

[0008] In order to achieve the above purpose, the present application provides the following technical scheme: the present application provides a UV oil for laser, which comprises the following components by mass percentage: polar monomer 40-50%, diluent monomer 15-30%, blending resin 5-15%, photoinitiator 8-13%, thixotropic agent 0.15-0.3%, wetting agent 0.1-0.2%, leveling agent 0.1-0.3%, defoaming agent 0.05-0.1%, antioxidant 0.05-0.1% and adhesion promoter 0.3-1%.

[0009] Preferably, the polar monomer comprises triacrylate monomer and long-chain unsaturated fatty alcohol.

[0010] Preferably, the triacrylate monomer is pentaerythritol triacrylate (PET3A).

[0011] Preferably, the polar monomer comprises triacrylate monomer and long-chain unsaturated fatty alcohol in a mass ratio of (2-4):1.

[0012] The polar monomer selected by the application selects pentaerythritol triacrylate (Mw=298) as the main body of the UV light oil, so that the surface after UV curing provides higher polarity and surface tension, ensures better firmness with aluminum plating, and saves energy consumption of corona treatment; at the same time, it can also ensure higher fluidity to realize fast mirror surface leveling effect. However, using the above polar monomer as the main body of the UV light oil cannot simultaneously realize the effects of fast self-leveling and large increase in surface energy. The inventors add long-chain unsaturated fatty alcohols to make the UV light oil fast self-leveling and greatly increase the surface energy, while improving the storage stability and yellowing resistance.

[0013] Preferably, the long-chain unsaturated fatty alcohol includes at least one of 8-nonen-1-ol and 9-decen-1-ol.

[0014] The long-chain unsaturated fatty alcohol of the application includes at least one of 8-nonen-1-ol and 9-decen-1-ol, which can better assist in reducing the hardness and brittleness caused by the relatively large amount of PET3A in the system and increasing flexibility. The molecular weight of 8-nonen-1-ol and 9-decen-1-ol can ensure the flexibility of the system of the application, while reducing the occurrence of pinacol rearrangement and other side reactions, and avoiding the release of a large amount of heat during photocuring.

[0015] Preferably, the blending resin is selected from at least one of polyester acrylate and aliphatic polyurethane acrylate.

[0016] Preferably, the molecular weight Mw of the blending resin is 4000-7200.

[0017] Preferably, the molecular weight Mw of the polyester acrylate is 4800-7200; and the molecular weight Mw of the aliphatic polyurethane acrylate is 4000-6000.

[0018] Preferably, the molecular weight of the polyester acrylate is Mw=6000; and the molecular weight Mw of the aliphatic polyurethane acrylate is 5000.

[0019] Preferably, the type of the polyester acrylate is Zannan EBECRYL 885; and the type of the aliphatic polyurethane acrylate is Zannan EBECRYL 230.

[0020] Preferably, the mass ratio of Zannan EBECRYL 885 to Zannan EBECRYL 230 is in the range of 0-2:0-2.

[0021] More preferably, the mass ratio of Zannan EBECRYL 885 to Zannan EBECRYL 230 is 1:0, 1:1, 2:1, 1:2 or 0:1. More preferably, the mass ratio of Zannan EBECRYL 885 to Zannan EBECRYL 230 is 1:1.

[0022] The application can improve the film breaking phenomenon in the process of aluminizing, and avoid further crushing in the slitting transportation process by adding the blending resin.

[0023] Preferably, the diluent monomer is selected from the group consisting of a dual-functional acrylate monomer.

[0024] Preferably, the dual-functional acrylate monomer comprises at least one of dipropylene glycol diacrylate (DPGDA) and tripropylene glycol diacrylate (TPGDA).

[0025] More preferably, the dual-functional acrylate monomer comprises (1-2): dipropylene glycol diacrylate (DPGDA) and tripropylene glycol diacrylate (TPGDA).

[0026] The diluent monomer of the application is selected from a dual-functional acrylate monomer, which has a lower irritating odor and can improve the application performance of the UV light oil. In particular, the specific proportion of TPGDA and DPGDA is used for compounding, and the comprehensive performance of the UV light oil is more excellent.

[0027] Preferably, the photoinitiator comprises 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide (TPO), methyl benzoylformate (MBF), 4-chlorobenzophenone (CBP), 4-phenylbenzophenone (PBZ) and a co-initiator.

[0028] Preferably, the co-initiator is an amine co-initiator.

[0029] Preferably, the amine co-initiator is selected from the group consisting of anti-yellowing active amine, and the model number is Hengzhiguang A113.

[0030] Preferably, the photoinitiator comprises 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide, methyl benzoylformate, 4-chlorobenzophenone, 4-phenylbenzophenone and amine co-initiator in a mass ratio of (1-3): (1-3): (0.5-1.5): (0.5-1.5): (5-8).

[0031] The main considerations for the selection of the type of photoinitiator include: reaction rate, polarity, odor, oxygen resistance, yellowing resistance, solubility, adhesion, and curing surface gloss value. On the basis of the influencing factors of the amount, several factors are added: light curing surface dryness, aging yellowing and its aging surface gloss value, etc. The use of the specific ratio of the photoinitiator in the system can improve the reaction rate, increase the curing yield, has good yellowing resistance effect, and can play the comprehensive advantages of cost and performance.

[0032] Preferably, the adhesion promoter is a silane coupling agent.

[0033] Preferably, the adhesion promoter is 3-(2,3-epoxypropoxy) propyl trimethoxysilane (KH560) or 3-isocyanate propyl trimethoxysilane.

[0034] The present application promotes the adhesion to the aluminum plating layer by adding an appropriate amount of KH560 adhesion promoter, which reacts with moisture in the environment. Analysis shows that after conventional photocuring, a small amount of photoinitiator is left, which further reacts during storage, causing the surface energy to decrease over time, which in turn causes the adhesion of the aluminum plating layer to the UV layer to decrease. The present application cannot use silane coupling agent 550 or 570, which lacks active functional groups to participate in the aging process of moisture curing, and cannot improve the aging performance.

[0035] Preferably, the thixotropic agent is selected from at least one of Wacker AEROSIL 200 ZNJ and Wacker AEROSIL E972.

[0036] Because the coated layer is thin and mostly monomer, the intermolecular gap is large under the microscope, and is greatly affected by oxygen inhibition, so a large amount of photoinitiator and co-initiator is required to make it dry to the touch; the viscosity of UV coating is greatly affected by environmental temperature, and when the environmental temperature is high, the viscosity is too low, which can easily cause sagging, so a certain amount of easily dispersible fumed silica is added to increase the thixotropy of the coating, but too much will seriously affect the leveling flow of the coating.

[0037] Preferably, the antioxidant is dibutylhydroxytoluene (BHT).

[0038] Because the light source used for photocuring is a mercury lamp, which has a side reaction of converting oxygen into ozone with stronger oxidizing properties at a wavelength of 240 nm, plus the large amount of heat generated during the photocuring process, both photo-oxidation and thermal-oxidation side reactions occur, which can cause yellowing. The problem is usually solved by adding an appropriate amount of antioxidant; the mechanism of action of the antioxidant is to compete for free radicals, not only oxygen free radicals, but also active free radicals after the photoinitiator is cracked, which can reduce the efficiency of the photoinitiator and cause incomplete curing, but too little addition cannot prevent yellowing, so the addition of the antioxidant needs to be strictly controlled.

[0039] Preferably, the wetting agent is selected from at least one of polyether-modified siloxane and modified acrylate.

[0040] Preferably, the wetting agent is selected from BYK-3565 and BYK-379.

[0041] Preferably, the wetting agent includes polyether-modified siloxane and modified acrylate in a mass ratio of 2:1 to 1:1.

[0042] Due to the large amount of monomer addition, the shrinkage of the self-leveling coating is also large relative to the resin, and the addition of an appropriate amount of fumed silica can effectively reduce the shrinkage of the coating; it is found through experiments that the mixing of polyether-modified siloxane and modified acrylate wetting agent can more effectively improve the wettability of the UV oil than using one of them alone, that is, the adhesion to the PET chemical film is improved. The wettability of polyether-modified siloxane is better than that of modified acrylate, and the flexibility of modified acrylate is relatively high, which can improve the flexibility, so the proportion range is 2:1-1:1, preferably 1:1.

[0043] Preferably, the leveling agent is selected from polyacrylate.

[0044] Preferably, the leveling agent is Shanghai Zi Yi Chemical ZY-1358 or BYK-361N of BIK Chemical.

[0045] Preferably, the defoaming agent is a polyacrylate defoaming agent.

[0046] Preferably, the defoaming agent is TEGO AIREX 923 of Wincell or BYK LP D 25665 of BIK Chemical.

[0047] Considering the surface polarity and surface energy, polyacrylate is selected for the leveling agent and the defoaming agent, rather than silicon or polyolefin, which can reduce the surface energy of the material, and the amount of addition is adjusted according to the amount of resin.

[0048] The present application provides a preparation method of the UV oil for laser, comprising the following steps:

[0049] (1) Weigh the polar monomer and the diluent monomer into a circulating water stainless steel kettle, start low-speed stirring, and get a mixed solution;

[0050] (2) Pour the defoaming agent and the wetting agent into the mixed solution, and pour the thixotropic agent, until all the powders are wetted by the solution and do not suspend on the surface of the solution;

[0051] (3) Pour the photoinitiator and the antioxidant, start water circulation heating to 35-50℃, until completely dissolved;

[0052] (4) Pour the remaining components, until the fluid is uniformly turbulent;

[0053] (5) Turn off the stirring, turn off the water circulation heating, take samples and inspect;

[0054] (6) After inspection, start water circulation cooling until the liquid temperature is lower than 35℃, install a filter screen at the end of the discharge pipe for filtering and barrel filling.

[0055] The present application provides a preparation method of the UV oil for laser:

[0056] (1) Take the required thixotropic agent into the circulating water stainless steel kettle;

[0057] (2) Pour the polar monomer, defoaming agent and wetting agent into the circulating water stainless steel kettle, start slow stirring until all the thixotropic agents are below the liquid surface;

[0058] (3) Pour the remaining other raw materials into the mixed solution, start water circulation and heat to 35-50℃;

[0059] (4) Turn off the water circulation heating, turn off the stirring, take samples for inspection;

[0060] (5) After inspection, start water circulation cooling, install a filter screen at the outlet of the discharge pipe and discharge into a barrel.

[0061] The third aspect of the application provides the application of the UV oil for laser in laser printing or laser packaging materials.

[0062] The UV oil of the application is suitable for two preparation processes, the first preparation process method has higher process controllability, can greatly avoid problems such as poor dispersion of gas silicon shearing, incomplete dissolution caused by solid photoinitiator sinking to the bottom, etc.; the second preparation process method reduces the process steps and greatly improves the preparation efficiency. The products prepared by the two preparation processes both have excellent effects. Therefore, the UV oil can be prepared according to different needs.

[0063] Compared with the prior art, the application has the following advantages and beneficial effects:

[0064] (1) The UV oil for laser provided by the application can effectively save the film coating step required in the traditional process, and significantly simplify the production process. The oil has excellent leveling property and rapid curing performance through optimized formula design, can be rapidly crosslinked and cured under ultraviolet light irradiation to form a dense and smooth surface coating, and realize a high gloss effect comparable to or even better than the traditional film coating process;

[0065] (2) The UV oil provided by the application has excellent storage stability and aging resistance, and is not easy to separate or deteriorate during long-term storage. While imparting good surface wettability and adhesion to the laser powder, it can also significantly improve the surface energy and optical performance of the laser powder, so that the final product presents a more bright, uniform and long-lasting metallic luster effect. The UV oil of the application not only meets the dual needs of aesthetics and functionality in high-end packaging, anti-counterfeiting labels, decorative materials and other fields, but also further expands its application prospects in fine printing and special decoration fields;

[0066] (3) The four construction paths of the UV varnish of the present application are all qualified, and are superior to the commercially available products. The UV varnish of the present application is suitable for the bottom or intermediate coating layer due to the relatively high surface Dk and polarity; the laser powder is dispersed in the subsequent decorative coating, so it can also be applied to the outer layer; if not applied to the UV laser powder, it can also be used for the mold coating, that is, the construction path one, and the subsequent cutting is not required, so the application is wide, and the present application has wide market prospect and application value. BRIEF DESCRIPTION OF DRAWINGS

[0067] Figure 1 The figure is a flowchart for preparing the process one;

[0068] Figure 2 The figure is a flowchart for preparing the process two;

[0069] Figure 3 The figure is a downstream application process flowchart of the UV varnish for laser. DETAILED DESCRIPTION

[0070] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0071] The present application provides a UV varnish for laser, which comprises the following components in mass percentage, and the specific contents are shown in Table 1.

[0072]

[0073] Please refer to Figure 1 The present application provides a preparation method of the UV varnish for laser, which comprises the following steps:

[0074] (1) The polar monomer and the diluent monomer are weighed and poured into a circulating water stainless steel kettle, and low-speed stirring is started to obtain a mixed solution;

[0075] (2) The defoaming agent and the wetting agent are poured into the mixed solution, and the thixotropic agent is poured until all the powders are wetted by the solution and cannot be suspended on the surface of the solution;

[0076] (3) The photoinitiator and the antioxidant are poured, and the water circulation is started to heat to 35-50 DEG C until complete dissolution;

[0077] (4) The remaining components are poured until the fluid is uniformly turbulent;

[0078] (5) The stirring is stopped, the water circulation heating is stopped, and the sample is taken and inspected;

[0079] (6) After passing the inspection, start the water circulation cooling until the liquid temperature is lower than 35℃, install the filter screen at the end of the discharge pipe to filter and barrel.

[0080] Please refer to Figure 2 The application provides a preparation method of the UV oil for laser:

[0081] (1) Put the required thixotropic agent into the circulating water stainless steel kettle;

[0082] (2) Put the polar monomer, defoaming agent and wetting agent into the circulating water stainless steel kettle, start slow stirring, and stir until all the thixotropic agent is below the liquid surface;

[0083] (3) Put the remaining other raw materials into the mixed solution, start water circulation heating to 35-50℃;

[0084] (4) Turn off the water circulation heating, turn off the stirring, and take a sample for inspection;

[0085] (5) After passing the inspection, start the water circulation cooling, install the filter screen at the outlet of the discharge pipe, and discharge and barrel.

[0086] Examples 1-5

[0087] A UV oil for laser includes the following components by mass percentage, and the specific values are shown in Table 2.

[0088]

[0089]

[0090] The UV oil for laser and the preparation method thereof include the following steps:

[0091] (1) Put all the monomers into the circulating water stainless steel kettle, start low-speed stirring, and the stirring speed is 200 r / min;

[0092] (2) Put the required defoaming agent and wetting agent into the solution of step (1), slowly pour the thixotropic agent powder into the solution, until all the powder is wetted by the solution and cannot be suspended on the surface of the solution, start high-speed stirring, the stirring speed is 2500 r / min, and the stirring time is 50 minutes, to obtain a mixed solution;

[0093] (3) Reduce the speed to about 400 r / min, pour the required photoinitiator and antioxidant, start water circulation heating to 40℃, increase the speed to 900 r / min, and stir until completely dissolved;

[0094] (4) Reduce the speed to about 400 r / min, pour the required resin, leveling agent, adhesion promoter, amine-based co-initiator, and increase the speed to 900 r / min. Stir for about 40 minutes until the fluid is uniformly turbulent;

[0095] (5) Turn off the stirring and close the water circulation heating. Take a sample and test it;

[0096] (6) After passing the test, start the water circulation cooling until the liquid temperature is below 35°C. Install a filter screen at the end of the discharge pipe and fill the barrel.

[0097] Comparative Examples 1-7

[0098] The difference between Comparative Examples 1-7 and Example 3 is the formulation. See Table 3 for details.

[0099]

[0100]

[0101] Performance Test:

[0102] I. Intermediate Product Testing: (1) Thixotropic agent and defoaming agent dispersion effect evaluation test method: Take 300 mL of the mixed solution after high-speed shearing in step (2), place it in a colorless transparent glass cup, perform ultrasonic rapid defoaming, and then use a flashlight to observe whether there are obvious large particle suspensions. Then use a 60 μm wire rod to scrape and coat, and observe whether there are obvious particles and whether there are obvious shrinkage holes.

[0103] II. Pre-discharge product testing: (1) Appearance: The solution presents a uniform yellowish turbid liquid without obvious large particle suspensions; (2) Viscosity: Take about 300 mL of UV oil, cool and keep it at 30±1°C, and put it into a rotor for rotational viscometer testing. Repeat three times and take the average value. The detected viscosity should be 20-50 mpas; (3) Coating test: Use a 20 μm coating wire rod, take an appropriate amount of oil, and place it on a corona-treated PET film for scraping and coating. There should be no obvious particles, air bubble points, or shrinkage holes; (4) Odor detection: There is no obvious offensive odor at room temperature; (5) Leveling test: Take an appropriate amount of oil and use a coating leveling instrument LPQ-1 to test. The time required for the leveling grade of 10 is less than 5 s;

[0104] III. Supplementary inspection before finished product delivery: (1) Accelerated aging test: take 250 mL light oil and place it in a black light-shielded bottle, and place it in a 70°C oven for three days. After aging, there should be no significant change in apparent color and viscosity compared to before aging; (2) Environmental protection test: meet the cigarette wrapper detection standard "YC / T-207-2014 Determination of Solvent Residues in Tobacco Paper by Headspace Gas Chromatography-Mass Spectrometry", and the contents of toluene and formaldehyde do not exceed the standard. After testing, the UV light oil for laser prepared by Examples 1-5 is all qualified in the above tests. The UV light oil for laser of Comparative Examples 1 and 2 is unqualified in the finished product pre-test. In Comparative Example 1, only PET3A is used without adding 8-nonen-1-ol, and the leveling performance is poor, which cannot reach the mirror leveling state before curing, and at a faster vehicle speed, the cured coating still has the net pattern of the coating roller, thereby affecting the surface flatness and gloss. In Comparative Example 2, when the proportion of resin one and resin two is 5%, the proportion of long-chain alcohol is too high, which leads to a significant decrease in viscosity, and when the ambient temperature is greater than 30°C, the coating process is prone to sagging. The UV light oil for laser of Comparative Examples 3-7 is all qualified in the above tests. The application performance of the UV light oil for laser of Examples 1-5 and Comparative Examples 3-7 is tested;

[0105] IV. Application performance test: The UV light oil of Examples 1-5 and Comparative Examples 3-7 and the conventional UV light oil (commercially available UV laser light oil 1103TF) are tested for construction, and the construction path is shown in Figure 3 . Among them, the conventional UV light oil is treated according to construction path three. The key parameters of the construction process are shown in Table 4.

[0106]

[0107] Test method:

[0108] (1) Surface energy determination: draw a line on the surface of the UV-cured coating with a da Vinci pen, and the line does not shrink for 3-5 seconds. Then, gradually increase or decrease the da Vinci value for testing. When the da Vinci pen test is qualified and the next da Vinci pen test shrinks, the da Vinci pen represents the surface tension test value. Test three times in parallel;

[0109] (2) Surface energy test after accelerated light aging: take an A4-sized film and perform 20 times of machine curing at a speed of 20 m / min under a 3kv mercury lamp, and then determine the surface energy according to the surface energy determination method;

[0110] (3) Corrosion resistance: take a small amount of dilute hydrochloric acid and drop it on the surface of the cured coating, let it stand for 15-30s, then wipe it clean, and observe whether there is any change. If there is no obvious change, it is qualified. If there are other phenomena such as fogging, it is unqualified;

[0111] (4) Gloss: use color difference instrument to test Lab value of 3-5 points on the surface after curing, take L value to calculate the average value;

[0112] (5) Aluminizing fastness I: use polar bear tape to press and stick to the aluminizing surface or UV layer, if the aluminizing layer and the UV layer are not separated, it is qualified, otherwise it is unqualified;

[0113] (6) Aluminizing fastness II: coat water-based glue on the card paper to compound the UV and aluminizing coating, tear off the PET release film, then use polar bear tape to press and stick to the UV and aluminizing coating, if the aluminizing layer and the UV layer are not separated, it is qualified, otherwise it is unqualified;

[0114] (7) Fastness with PET chemical film: use polar bear tape to press and stick to the UV layer, if the PET and the UV layer are not separated, it is qualified, otherwise it is unqualified;

[0115] (8) Fastness with PET release film: use polar bear tape to press and stick to the aluminizing surface or UV layer, the UV layer should be easily separated from the PET release film, then it is determined to be qualified, if there is residue, it is unqualified;

[0116] (9) Storage stability test: according to GB / T 33327-2016, put the above laser powder in the conventional UV coating, put it in a 50℃ oven for 7 days continuous test, and observe the sinking of the laser powder every day, record the sinking days;

[0117] (10) Accelerated yellowing test: under the condition of 3kv mercury lamp and 20m / min vehicle speed, take appropriate amount of varnish and coat it on white card paper, then perform 20 times of curing, if the color is not obviously deepened and yellowed, it is qualified, otherwise it is unqualified.

[0118] The construction results of example 3 are shown in table 5.

[0119]

[0120] It should be noted that " / " in the above table represents that no test is performed, fastness I is the test method of the composite coating, and fastness II is the test method of the transfer coating.

[0121] After detection, the surface energy of the UV varnish prepared in examples 1-5 is greater than or equal to 50, the surface energy after accelerated light aging is greater than or equal to 46, the surface energy and gloss are better than those of conventional products, the four construction paths are qualified, the aluminizing fastness is high, the corrosion resistance is qualified, the combination fastness with PET is high, the storage stability is good, and the yellowing resistance effect is good.

[0122] It is detected that the anti-oxygen polymerization resistance of HDDA in the curing process is significantly poorer than that of DPGDA in the comparative example 3, the curing degree and the surface drying effect are poor, the surface gloss and viscosity are poor, the aluminizing fastness is unqualified under the condition of the construction path 3, and the surface drying is insufficient, which will cause mutual adhesion after winding in the four construction paths.

[0123] The amount of monomer four is greatly increased in the comparative example 4, and the coating will appear sagging phenomenon when the construction environment temperature is greater than about 35℃.

[0124] The monomer one is replaced in the comparative example 5, which will cause the aluminizing fastness of the construction 1 and 2 to be unqualified.

[0125] The monomer two is replaced in the comparative example 6, and the construction environment temperature range is narrow, which is not suitable for actual application.

[0126] The Zhenxin EBECRYL 885 is replaced by Zhenxin EBECRYL 884, and the Zhenxin EBECRYL 230 is replaced by Zhenxin EBECRYL 4512 in the comparative example 7, which causes the filling to be insufficient in the construction path 1, and the pattern is incomplete, and the small molecular weight resin is filled, which can be improved, but it is difficult to completely solve.

[0127] The above is the preferred embodiment of the present application, it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, can also make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A UV light oil for laser, characterized by, The components include the following mass percentages: polar monomer 40-50%, dilution monomer 15-30%, blending resin 5-15%, photoinitiator 8-13%, thixotropic agent 0.15-0.3%, wetting agent 0.1-0.2%, leveling agent 0.1-0.3%, defoaming agent 0.05-0.1%, antioxidant 0.05-0.1%, and adhesion promoter 0.3-1%, the sum of the mass percentages of the components of the UV light oil being 100%; the polar monomer includes a triacrylate monomer and a long-chain unsaturated fatty alcohol in a mass ratio of (2-4):1; the long-chain unsaturated fatty alcohol is selected from at least one of 8-nonen-1-ol and 9-decen-1-ol; the triacrylate monomer is pentaerythritol triacrylate; the blending resin is selected from at least one of polyester acrylate and aliphatic polyurethane acrylate; the molecular weight Mw of the blending resin is 4000-7200; and the dilution monomer is selected from a diacrylate monomer; the diacrylate monomer includes dipropylene glycol diacrylate and tripropylene glycol diacrylate in a mass ratio of (1-2):

1.

2. The UV light oil for laser according to claim 1, wherein, The photoinitiator includes 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide, methyl benzoylformate, 4-chlorobenzophenone, 4-phenylbenzophenone, and a co-initiator.

3. A method of preparing the UV light oil for laser according to any one of claims 1-2, characterized in that, The method includes the following steps: (1) weigh the polar monomer and the dilution monomer into a circulating water stainless steel kettle, stir to obtain a mixed solution; (2) pour the defoaming agent and the wetting agent into the mixed solution, and pour in the thixotropic agent until all the powders are wetted by the solution and do not suspend on the surface of the solution; (3) continue to pour in the photoinitiator and the antioxidant, heat until completely dissolved; (4) pour in the remaining components until the fluid is uniformly turbulent; (5) turn off the stirring, turn off the water circulation heating, take a sample and inspect; (6) after inspection, start water circulation cooling, install a filter screen at the end of the discharge pipe to filter and fill the barrels.

4. A method for preparing the UV light oil for laser printing according to any one of claims 1-2, characterized in that: (1) weigh the thixotropic agent into a circulating water stainless steel kettle; (2) pour the polar monomer, the defoaming agent, and the wetting agent into the circulating water stainless steel kettle, stir until all the thixotropic agent is below the liquid surface to obtain a mixed solution; (3) pour the remaining other raw materials into the mixed solution, and start water circulation heating; (4) turn off the water circulation heating, turn off the stirring, take a sample and inspect; (5) after inspection, start water circulation cooling, install a filter screen at the outlet of the discharge pipe and discharge to fill the barrels.

5. Use of the UV light oil for laser printing according to any one of claims 1-2 in laser printing or laser packaging materials.

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