A multifunctional primer and preparation method thereof

Abstract

The present invention provides a multifunctional primer and a preparation method thereof. The multifunctional primer provided by the present invention comprises, by mass, 30 to 60 parts of a special UV flexible adhesion resin; 10 to 30 parts of a thermoplastic acrylic resin; 20 to 40 parts of an active diluent; 2 to 5 parts of a photoinitiator; and 1 to 3 parts of an adhesion promoter; wherein the thermoplastic acrylic resin comprises a high Tg thermoplastic acrylic resin and a low Tg thermoplastic acrylic resin; wherein the high Tg thermoplastic acrylic resin is a thermoplastic acrylic resin with a Tg ≥ 40°, and the low Tg thermoplastic acrylic resin is a thermoplastic acrylic resin with a Tg < 0°. The multifunctional primer provided by the present invention can have excellent flexibility and hardness while ensuring excellent firmness, and also achieves low heat release, good alcohol resistance, scratch resistance, and permeability.

Description

Technical Field

[0001] The invention relates to the field of organic materials, and in particular to a multifunctional primer and a preparation method thereof. Background Art

[0002] Gel nail polish, also known as nail glue, is the latest nail material to emerge in the nail industry in recent years. Compared with traditional nail polish, it is environmentally friendly and non-toxic, has rich colors, and is durable. Since gel nail polish is a light-cured product, it has the characteristics of fast curing, excellent strength, and a variety of functions compared to traditional nail polish. It is precisely because traditional nail polish has certain disadvantages such as toxicity, slow curing, poor strength, and poor color saturation that traditional nail polish has been gradually replaced by gel nail polish.

[0003] As a product of nail polish, base gel mainly provides adhesion to nails and interlayer adhesion. It has the characteristics of good flexibility and good firmness. However, it also has some disadvantages, such as insufficient hardness (cannot have both hardness and flexibility), slow curing speed, and high heat release. Summary of the invention

[0004] In view of this, the present invention provides a multifunctional primer and a preparation method thereof. The multifunctional primer provided by the present invention can have excellent flexibility and hardness while ensuring excellent adhesion, and also achieves low heat release, good alcohol resistance, scratch resistance and permeability.

[0005] The present invention provides a multifunctional primer, and the raw materials for preparing the primer include, by weight:

[0006]

[0007] in,

[0008] The thermoplastic acrylic resin includes a high Tg thermoplastic acrylic resin and a low Tg thermoplastic acrylic resin; wherein the high Tg thermoplastic acrylic resin is a thermoplastic acrylic resin with a Tg of ≥40°, and the low Tg thermoplastic acrylic resin is a thermoplastic acrylic resin with a Tg of <0°.

[0009] Preferably, the special UV flexible adhesion resin is HP6285.

[0010] Preferably, the high Tg thermoplastic acrylic resin is at least one of DSM B890, Mitsubishi BR-115, Mitsubishi BR-116 and Mitsubishi BR-113;

[0011] The low Tg thermoplastic acrylic resin is at least one of Bolil BM723 and Bolil BM701C.

[0012] Preferably, the high Tg thermoplastic acrylic resin is DSM B890;

[0013] The low Tg thermoplastic acrylic resin is Bolier BM723.

[0014] Preferably, the mass ratio of the high Tg thermoplastic acrylic resin to the low Tg thermoplastic acrylic resin is (1-2):1.

[0015] Preferably, the active diluent is two or more of EM2104, EM315, EM2202 and EM105.

[0016] Preferably, the active diluent is EM2104, EM315, EM2202 and EM105.

[0017] Preferably, the photoinitiator is preferably 184 and TPO;

[0018] The adhesion promoter is phosphate ester HC5351.

[0019] The present invention also provides a method for preparing the multifunctional primer described in the above technical solution, comprising:

[0020] The active diluent, the photoinitiator and the adhesion promoter are mixed to obtain a mixture; then, a thermoplastic acrylic resin and a special UV flexible adhesion resin are added and continued to be mixed to obtain a multifunctional primer.

[0021] Preferably, the method specifically comprises: mixing an active diluent, a photoinitiator and an adhesion promoter, raising the temperature to 70-80° C., stirring at 1000-1500 r / min for 15-30 min until the photoinitiator is completely dissolved to obtain a mixture; then, adding thermoplastic acrylic resin in batches under low-speed stirring at 800-1000 r / min, and after adding, stirring at a speed of 1000-1500 r / min for 60-120 min until the thermoplastic acrylic resin is completely dissolved; then, adding a special UV flexible adhesion resin, and continuing to stir for 60-120 min; filtering to obtain a multifunctional primer.

[0022] The present invention provides a multifunctional primer, which is prepared by combining a special UV flexible adhesion resin, a thermoplastic acrylic resin, a reactive diluent, a photoinitiator, and an adhesion promoter in a certain proportion, wherein the thermoplastic acrylic resin is composed of a specific high Tg thermoplastic acrylic resin and a low Tg thermoplastic acrylic resin, and the reactive diluent is composed of several acrylic resins. The combination of the above components can make the obtained primer have the effects of fast curing, good adhesion, low heat release, high hardness, low odor, alcohol resistance, scratch resistance, and good adhesion to plastic substrates. Compared with ordinary primers, the multifunctional primer of the present invention has the characteristics of multiple functional types and wide application: it can be used as primer, construction, reinforcement, patch, scrub seal, pen moistening, etc., providing an all-in-one high-performance primer.

[0023] The test results show that the multifunctional base glue of the present invention has good firmness and adhesion to both nails and nail plates, and shows excellent effects in both thick and thin coatings, with adhesion reaching level 0 and firmness reaching level 5. Moreover, the multifunctional base glue of the present invention also has good flexibility and hardness: in the flexibility test, the initial folding times of the film after curing for 1 minute can reach more than 10 times, and it can also be kept for more than 10 times after cooling for 30 minutes, and it can still be kept for more than 10 times after being placed for one day. It can be seen that its flexibility is very good and it will basically not become brittle due to the influence of UV post-curing; at the same time, the hardness can reach more than 75D after curing for 1 day, reaching a relatively high hardness. In addition, the multifunctional base glue of the present invention also achieves low heat release, good alcohol resistance, scratch resistance and permeability. DETAILED DESCRIPTION

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0025] In this article, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0026] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0027] Herein, when it comes to numerical ranges, unless otherwise specified, the numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0028] In this article, when referring to the unit of a data range, if there is a unit only after the right endpoint, it means that the units of the left and right endpoints are the same. For example, 70-80℃ means that the units of the left endpoint "70" and the right endpoint "80" are both ℃.

[0029] The present invention provides a multifunctional primer, and the raw materials for preparing the primer include, by weight:

[0030]

[0031] in,

[0032] The thermoplastic acrylic resin includes a high Tg thermoplastic acrylic resin and a low Tg thermoplastic acrylic resin; wherein the high Tg thermoplastic acrylic resin is a thermoplastic acrylic resin with a Tg of ≥40°, and the low Tg thermoplastic acrylic resin is a thermoplastic acrylic resin with a Tg of <0°.

[0033] About special UV flexible adhesion resin:

[0034] In the present invention, the special UV flexible adhesion resin is the main UV film-forming material, and HP6285 is preferred in the present invention. Compared with other UV resins, the above-mentioned UV resin is used in combination with other components of the present invention to better improve the firmness and flexibility of the base glue to the nails, and the low heat release, and can also improve the yellowing resistance and odor (low odor), and also has good adhesion to other plastic substrates.

[0035] In the present invention, the dosage of the special UV flexible adhesion resin is 30 to 60 parts, specifically 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 47 parts, 48 ​​parts, 49 parts, 50 parts, 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts, 58 parts, 59 parts, and 60 parts.

[0036] About Thermoplastic Acrylic Resins:

[0037] In the present invention, the thermoplastic acrylic resin includes a high Tg thermoplastic acrylic resin and a low Tg thermoplastic acrylic resin.

[0038] in,

[0039] The high Tg thermoplastic acrylic resin is a thermoplastic acrylic resin with Tg ≥ 40°, preferably at least one of DSM B890, Mitsubishi BR-115, Mitsubishi BR-116 and Mitsubishi BR-113, and most preferably DSM B890.

[0040] The low Tg thermoplastic acrylic resin is a thermoplastic acrylic resin with Tg < 0°, preferably at least one of Bolier BM723 and Bolier BM701C, and most preferably Bolier BM723.

[0041] The mass ratio of the high Tg thermoplastic acrylic resin to the low Tg thermoplastic acrylic resin is preferably (1-2):1, specifically 1:1, 1.5:1, or 2:1.

[0042] The present invention adopts the high Tg thermoplastic acrylic resin and the low Tg thermoplastic acrylic resin in a certain proportion, which can effectively improve the hardness and firmness of the glue, and at the same time reduce the heat in UV curing, improve the hardness, wear resistance, alcohol resistance, scratch resistance and other properties, and has low odor.

[0043] In the present invention, the amount of the thermoplastic acrylic resin is 10 to 30 parts, specifically 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, and 30 parts.

[0044] About active diluents:

[0045] In the present invention, the active diluent is preferably an acrylic resin, more preferably two or more of Changxing Chemical EM2104 (3,3,5-trimethylcyclohexyl acrylate), EM315 (lauric acid methacrylate), EM2202 (3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2 dimethylpropyl diacrylate), and EM105 (4-tert-butyl cyclohexyl acrylate); the most preferred are EM2104, EM105, EM315 and EM2202. The combination has very outstanding performance. EM2104 and EM2202 are mainly used to improve the adhesion of the glue. EM105 has a very slow reaction speed. When used with EM105, it can be mainly used in the formula to reduce the heat released when the glue is cured. When used with EM315, the scratch resistance, alcohol resistance, wear resistance and other properties of the glue can be improved.

[0046] In the present invention, when the active diluent is EM2104, EM105, EM315 and EM2202, the mass ratio of EM2104:EM105:EM315:EM2202 is preferably 2:2:1:3.

[0047] In the present invention, the amount of the active diluent is 20 to 40 parts, specifically 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, and 40 parts.

[0048] About Photoinitiator:

[0049] In the present invention, the photoinitiator is preferably a cleavage-type free radical initiator, and more preferably a composite free radical photoinitiator composed of 184 (1-hydroxy-cyclohexyl-phenyl ketone) and TPO (2,4,6-trimethylbenzoyl-diphenylphosphine oxide). Among them, the mass ratio of 184:TPO is preferably 3:1. The above combination can improve the curing effect while reducing the heat released when the glue is cured.

[0050] In the present invention, the amount of the photoinitiator is 2 to 5 parts, specifically 2 parts, 3 parts, 4 parts, or 5 parts.

[0051] About Adhesion Promoters:

[0052] In the present invention, the adhesion promoter is preferably phosphate ester HC5351, which is from Guangdong Haohui. The above adhesion promoter is used in combination with other components of the present invention to effectively increase the adhesion of glue to nails.

[0053] In the present invention, the amount of the adhesion promoter is 1 to 3 parts, specifically 1 part, 2 parts, or 3 parts.

[0054] In one embodiment of the present invention, the raw materials for preparing the multifunctional primer are:

[0055]

[0056] In another embodiment of the present invention, the raw materials for preparing the multifunctional primer are:

[0057]

[0058] The present invention also provides a method for preparing the multifunctional primer described in the above technical solution, comprising the following steps:

[0059] The active diluent, the photoinitiator and the adhesion promoter are mixed to obtain a mixture; then, a thermoplastic acrylic resin and a special UV flexible adhesion resin are added and continued to be mixed to obtain a multifunctional primer.

[0060] Among them, the types and amounts of the active diluent, photoinitiator, adhesion promoter, thermoplastic acrylic resin and special UV flexible adhesion resin are consistent with those described in the previous technical solution and will not be repeated here.

[0061] In the present invention, preferably, the above-mentioned preparation method specifically comprises: mixing the active diluent, the photoinitiator and the adhesion promoter, raising the temperature to 70-80°C, stirring at 1000-1500r / min for 15-30min, until the photoinitiator is completely dissolved, to obtain a mixture; then, adding the thermoplastic acrylic resin in batches under low-speed stirring at 800-1000r / min, and after adding, stirring at a speed of 1000-1500r / min for 60-120min, until the thermoplastic acrylic resin is completely dissolved; then, adding a special UV flexible adhesion resin, and continuing to stir for 60-120min; filtering to obtain a multifunctional primer.

[0062] In the present invention, the mixing temperature is preferably 70-80°C, specifically 70°C, 71°C, 72°C, 73°C, 74°C, 75°C, 76°C, 77°C, 78°C, 79°C, 80°C. The mixing method is preferably stirring and mixing. The stirring and mixing speed is preferably 1000-1500r / min, specifically 1000r / min, 1100r / min, 1200r / min, 1300r / min, 1400r / min, 1500r / min. The stirring and mixing time is preferably 15-30min, specifically 15min, 16min, 17min, 18min, 19min, 20min. The above mixing is performed until the photoinitiator is completely dissolved.

[0063] In the present invention, the thermoplastic acrylic resin is preferably added under low-speed stirring. The speed of the low-speed stirring is preferably 800-1000r / min, specifically 800r / min, 850r / min, 900r / min, 950r / min, 1000r / min. The method of adding the thermoplastic acrylic resin is preferably to add it in batches, and the amount added in each batch is 20%-30% of the total mass of the thermoplastic acrylic resin, specifically 20%, 25%, 30%; each batch is added after a period of time; the interval time is preferably 20-30min, specifically 20min, 25min, 30min. After all the thermoplastic acrylic resins are added, continue to stir and dissolve. The speed of the stirring is preferably 1000-1500r / min, specifically 1000r / min, 1100r / min, 1200r / min, 1300r / min, 1400r / min, 1500r / min. The stirring time is preferably 60 to 120 minutes, specifically 60 minutes, 70 minutes, 80 minutes, 90 minutes, 100 minutes, 110 minutes, and 120 minutes. After the above stirring treatment, until the thermoplastic acrylic resin is completely dissolved, then the special UV flexible adhesion resin is added. In the present invention, it is preferred to add the special UV flexible adhesion resin at the above rotation speed (i.e. 1000 to 1500 r / min), and after the addition is completed, continue stirring for 60 to 120 minutes, specifically 60 minutes, 70 minutes, 80 minutes, 90 minutes, 100 minutes, 110 minutes, and 120 minutes. . In the present invention, the entire process of adding the thermoplastic acrylic resin, the special UV flexible adhesion resin and stirring and mixing is preferably maintained at a temperature of 70-80° C. (i.e., a series of mixing operations are performed at the initial heating temperature), specifically 70° C., 71° C., 72° C., 73° C., 74° C., 75° C., 76° C., 77° C., 78° C., 79° C., 80° C. After the mixing is completed, it is preferably filtered, more preferably filtered with a 200-mesh filter, to obtain a multifunctional primer.

[0064] The present invention also provides a method for using the multifunctional primer described in the above technical solution, comprising: coating the primer on a substrate, curing it by ultraviolet light, and forming a primer layer; wherein the primer is the multifunctional primer described in the above technical solution, which will not be described in detail here.

[0065] The substrate is preferably a nail or a nail plate. The ultraviolet light irradiation curing conditions are preferably: using an LED-UV nail lamp, the output power of the nail lamp is ≤48W, and the curing time is 1 minute.

[0066] Ordinary base glue has the disadvantages of single functionality, low hardness, low bonding strength to nail pieces, large heat release, etc., and its applicability is not wide. Compared with ordinary base glue, the multifunctional base glue provided by the present invention has significant advantages. Its hardness is higher, and it can reach more than 75D after curing for 1 hour; at the same time, its flexibility is also better. The initial folding times of the film after curing for 1 minute can reach more than 10 times, and it can also be kept for more than 10 times after cooling for 30 minutes. After being placed for one day, it can still be kept for more than 10 times. It can be seen that its flexibility is very good, and it will basically not become brittle due to the influence of UV post-curing. It overcomes the contradictory performance of hardness and flexibility and achieves the effect of both. Moreover, it has excellent adhesion to nails, reaching a higher adhesion level, and there is no warping and falling off after 30 days, and the durability is very good; moreover, it has low heat release, and no obvious heat can be felt when it is thickly coated with light. In addition, it realizes the multi-in-one function and has wide versatility. It can be used as base glue, construction, reinforcement, patch, scrubbing seal, pen moistening, etc.

[0067] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0068] Example 1-2

[0069] 1. Raw materials:

[0070] The raw material composition of Example 1-2 is shown in Table 1:

[0071] Table 1: Raw material composition of Examples 1-2

[0072]

[0073] 2. Preparation:

[0074] Mix the active diluent, photoinitiator and adhesion promoter, heat to 70°C, and stir at 1200r / min for 20min until the photoinitiator is completely dissolved. Then, add the thermoplastic acrylic resin in batches at a low speed of 900r / min, and then stir at 1200r / min for 80min until the thermoplastic acrylic resin is completely dissolved. Then, add the special UV flexible adhesion resin, keep stirring at 70°C at the above 1200r / min for 60min. Filter with a 200-mesh filter to obtain a multifunctional primer.

[0075] 3. Use:

[0076] The multifunctional primer is applied on the substrate and cured by ultraviolet light from an LED-UV nail lamp.

[0077] Comparative Example 1

[0078] The method is implemented in accordance with Example 1, except that the low Tg thermoplastic acrylic resin BM723 is replaced by the high Tg thermoplastic acrylic resin B890 (ie, the thermoplastic resin is all a single high Tg thermoplastic acrylic resin B890).

[0079] Comparative Example 2

[0080] The method is implemented in accordance with Example 1, except that the high Tg thermoplastic acrylic resin B890 is replaced by the low Tg thermoplastic acrylic resin BM723 (ie, the thermoplastic resin is all a single low Tg thermoplastic acrylic resin BM723).

[0081] Comparative Example 3

[0082] The method was implemented according to Example 2, except that the low Tg thermoplastic acrylic resin BM723 was not added, and the amount of the special UV flexible adhesion resin HP6285 was increased to 50 parts.

[0083] Comparative Example 4

[0084] The method is implemented in accordance with Example 1, except that EM315 and EM2202 in the active diluent are omitted, and the gap in usage is supplemented by EM2104 and EM105, and the ratio of EM2104 to EM105 is the same as that in Example 1 (i.e., the active diluent is entirely EM2104+EM105, and the ratio of EM2104 to EM105 is maintained the same as that in Example 1).

[0085] Comparative Example 5

[0086] The method is implemented in accordance with Example 1, except that EM2104 and EM105 in the active diluents are omitted, and the gap in usage is supplemented by EM315 and EM2202, and the ratio of EM315 to EM2202 is the same as that in Example 1 (i.e., all active diluents are EM315 and EM2202, and the ratio of EM315 to EM2202 is maintained the same as that in Example 1).

[0087] Product Testing :

[0088] The following performance tests were performed on each embodiment and comparative example, and the results are shown in Table 2.

[0089] (1) Adhesion test: Apply the primer on the substrate, and after curing for 1 minute, test the adhesion to the substrate. The above test is carried out with PC nail plate as the substrate; and the substrate is tested with thick coating (coating thickness is 1mm) and thin coating (coating thickness is 0.1mm) respectively. When testing adhesion, refer to GB9286-1998 standard. The test results are divided into six levels: 0, 1, 2, 3, 4, and 5. The smaller the number, the higher the level and the better the adhesion. In addition, the thick-coated sample of the nail plate substrate is used as the test object, and observe whether there is any warping or falling off after 30 days.

[0090] (2) Flexibility test: Repeatedly test by folding the film 180° until the film cracks, and record the corresponding number of folds. The larger the number, the more times it can be folded and the better the flexibility. Take a film with a thickness of 1 mm as the test object, and perform the above test at three time periods: test after curing for 1 minute (i.e. initial flexibility), test after cooling for 30 minutes, and test after standing for 24 hours.

[0091] (3) Heat release test: Apply the base coat to the nails and irradiate with a 48W LED-UV nail lamp for 1 minute to feel the heat release during the curing process. The test is divided into five levels: 1, 2, 3, 4, and 5. The larger the number, the higher the level and the lower the heat release. The thick coating (coating thickness is 1mm) and thin coating (coating thickness is 0.1mm) tests are performed separately.

[0092] (4) Hardness: Shore hardness test. A 2 mm thick film was used as the test object and the above test was performed at three time periods: 1 min after curing (i.e. initial hardness), 30 min after cooling, and 24 h after standing.

[0093] (5) Transparency: Apply the base coat on the nails and cure it with a 48W LED-UV nail lamp for 1 min (film thickness is 2 mm). Use the observation method to judge the transparency of the product based on whether it becomes foggy, white, or has obvious color change after curing.

[0094] (6) Alcohol resistance test: Apply the base coat on the nails and cure it with a 48W LED-UV nail lamp for 1 minute (film thickness is 1mm). Use a dust-free cloth dipped in alcohol to wipe the film surface repeatedly 10 times to observe whether it loses gloss.

[0095] (7) Scratch resistance test: Apply the primer on the nails and cure it with a 48W LED-UV nail lamp for 1 min (film thickness is 1 mm). Use a Newton pen to scratch the film surface with a force of 3N to observe whether there is any scratch.

[0096] (8) Firmness test: Wipe the nails with a dust-free cloth dipped in alcohol, apply the base coat to the nails, and cure with a 48W LED-UV nail lamp for 1 minute. Perform thick coating (coating thickness of about 1mm) and thin coating (coating thickness of about 0.1mm) tests respectively. After the film has cooled for 1 minute, use your hand to pick at the junction of the film and the nail. If it cannot be removed at all, it is level 5. If it is removed a little with greater force, it is level 4. If it is removed with greater force, it is level 3. If it is removed with greater force, it is level 2. If it is removed with less force, it is level 1. If it is removed with less force, it is level 0. The larger the number, the higher the level and the better the firmness.

[0097] Table 2: Test results

[0098]

[0099] It can be seen from the test results in Table 2 that the products obtained in Examples 1-2 of the present invention have good firmness and adhesion to nails and nail plates, and both thick and thin coatings show excellent effects, with adhesion reaching level 0 and firmness reaching level 5. Moreover, the products obtained in Examples 1-2 also have good flexibility and hardness at the same time: in the flexibility test, the initial folding times of the film after curing for 1 minute can reach more than 10 times, and it can also be kept for more than 10 times after cooling for 30 minutes, and it can still be kept for more than 10 times after being placed for one day. It can be seen that its flexibility is very good and it will basically not become brittle due to the influence of UV post-curing; at the same time, the hardness can reach more than 75D after curing for 1 day, reaching a relatively high hardness, that is, it has excellent toughness and hardness at the same time. In addition, the products obtained in Examples 1-2 also achieve low heat release, good alcohol resistance, scratch resistance and permeability. Its high hardness, low heat release, alcohol resistance and scratch resistance can fully meet the functions of reinforcement, construction, scrubbing and sealing. At the same time, it has good adhesion to nails and nail plates, and can be used as a base glue and patch glue, achieving multi-functions.

[0100] Compared with Example 1, the adhesion and flexibility of Comparative Example 1 are significantly deteriorated, and the hardness, scratch resistance, and alcohol resistance of Comparative Example 2 are significantly reduced, which proves that the present invention adopts a combination of high Tg thermoplastic acrylic resin and low Tg thermoplastic acrylic resin to effectively improve the comprehensive performance of the product. Compared with Example 1, the hardness of Comparative Example 3 is reduced, the alcohol resistance and scratch resistance are deteriorated, and the heat release of thick coating is increased, which further proves that the present invention introduces low Tg thermoplastic acrylic resin, which can effectively control the heat release of glue, does not affect other properties of glue, and improves its hardness, alcohol resistance and scratch resistance. Compared with Example 1, the flexibility of Comparative Example 4 is reduced, the heat release of thick coating is significantly increased, and the scratch resistance and alcohol resistance of Comparative Example 5 are deteriorated, which proves that the present invention adopts a specific combination of four acrylic esters as active diluents, which is beneficial to improving the comprehensive performance of the product.

[0101] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas, including the best mode, and also enable any technician in the field to practice the present invention, including making and using any device or system, and implementing any combined method. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The scope of patent protection of the present invention is defined by the claims and may include other embodiments that can be thought of by those skilled in the art. If these other embodiments have structural elements similar to the literal expression of the claims, or if they include equivalent structural elements that are not substantially different from the literal expression of the claims, then these other embodiments should also be included in the scope of the claims.

Claims

1. A multifunctional primer, characterized in that: The raw materials for its preparation include, by weight: in, The thermoplastic acrylic resin includes a high Tg thermoplastic acrylic resin and a low Tg thermoplastic acrylic resin; wherein the high Tg thermoplastic acrylic resin is a thermoplastic acrylic resin with a Tg of ≥40°, and the low Tg thermoplastic acrylic resin is a thermoplastic acrylic resin with a Tg of <0°.

2. The multifunctional primer according to claim 1, characterized in that: The special UV flexible adhesion resin is HP6285.

3. The multifunctional primer according to claim 1, characterized in that: The high Tg thermoplastic acrylic resin is at least one of DSM B890, Mitsubishi BR-115, Mitsubishi BR-116 and Mitsubishi BR-113; The low Tg thermoplastic acrylic resin is at least one of Bolil BM723 and Bolil BM701C.

4. The multifunctional primer according to claim 1 or 3, characterized in that: The high Tg thermoplastic acrylic resin is DSM B890; The low Tg thermoplastic acrylic resin is Bolier BM723.

5. The multifunctional primer according to claim 1, characterized in that: The mass ratio of the high Tg thermoplastic acrylic resin to the low Tg thermoplastic acrylic resin is (1-2):

1.

6. The multifunctional primer according to claim 1, characterized in that: The active diluent is two or more of EM2104, EM315, EM2202 and EM105.

7. The multifunctional primer according to claim 1 or 6, characterized in that: The active diluents are EM2104, EM315, EM2202 and EM105.

8. The multifunctional primer according to claim 1, characterized in that: The photoinitiator is preferably 184 and TPO; The adhesion promoter is phosphate ester HC5351.

9. A method for preparing the multifunctional primer according to any one of claims 1 to 8, characterized in that: include: The active diluent, the photoinitiator and the adhesion promoter are mixed to obtain a mixture; then, a thermoplastic acrylic resin and a special UV flexible adhesion resin are added and continued to be mixed to obtain a multifunctional primer.

10. The preparation method according to claim 9, characterized in that: Specifically include: The active diluent, the photoinitiator and the adhesion promoter are mixed, the temperature is raised to 70-80° C., and stirred at 1000-1500 r / min for 15-30 min until the photoinitiator is completely dissolved to obtain a mixture; then, the thermoplastic acrylic resin is added in batches at a low speed of 800-1000 r / min, and after the addition is completed, the mixture is stirred at a speed of 1000-1500 r / min for 60-120 min until the thermoplastic acrylic resin is completely dissolved; After that, add special UV flexible adhesion resin and continue stirring for 60 to 120 minutes; filter to obtain a multifunctional primer.

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