UV (ultraviolet) curing matte primer for PP (polypropylene) floor and preparation method of UV curing matte primer

Abstract

The invention discloses a UV-cured matte primer for a PP floor and a preparation method of the UV-cured matte primer. The UV-cured matte primer comprises the following components in percentage by mass: 10%-20% of urethane acrylate I, 10%-20% of urethane acrylate II, 5%-10% of adhesion promoting resin, 5%-10% of a monofunctional active monomer, 20%-40% of a bifunctional active monomer, 5%-10% of a photoinitiator, 1%-5% of a photoinitiator, 1%-5% of a photoinitiator, 1%-5% of a photoinitiator, and the balance of a solvent. The mass percent of the photoinitiator is 0.5%-3%, the mass percent of the adhesion promoter is 0.1%-2%, the mass percent of the matting powder is 8%-10%, and the mass percent of the auxiliary agent is 0.1%-2%. The formula is simple in composition, free of organic solvent, green and environment-friendly, and not only has good adhesion to a PP base material, but also has good adhesion to subsequent finish paint layers; according to the preparation method, the pretreatment step of the PP floor is reduced, so that the production process of the PP floor is consistent with that of the traditional PVC plastic floor, the energy consumption and the production cost are greatly reduced, the production efficiency is greatly improved, and remarkable economic benefits are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of primer formulations and relates to a UV-curing matte primer, in particular to a UV-curing matte primer for PP floors and a preparation method thereof. Background Art

[0002] Plastic floor is a new type of lightweight bottom surface decoration material popular in the world today. Compared with traditional floor materials such as solid wood floor, composite floor and ceramic tile, it has the advantages of wide application range, wide price selection range, light weight, wear resistance and antibacterial, green and environmental protection, formaldehyde-free, easy to lay, etc., and is widely used in various places. According to its raw material classification, plastic floor can be divided into polyvinyl chloride (PVC) plastic, polypropylene (PP) plastic, polyethylene (PE) and other types.

[0003] PVC is the most widely used in the current market due to its light weight, flame retardant, moisture-proof and other characteristics, and its performance can be easily adjusted by adjusting the ratio of plasticizers and fillers in the formula. However, PVC flooring is not resistant to high temperatures and cannot be used at high temperatures. PP is an amorphous polymer with low density, good comprehensive properties such as heat resistance, hardness, strength and stiffness, and can be used at around 100°C. It does not contain halogen and can be used to replace traditional PVC flooring.

[0004] However, due to the low surface tension and strong solvent resistance of PP substrate, the surface is difficult to wet and difficult to adhere to various coatings. Since UV coating has a short substrate infiltration time and solidification is completed in a few seconds, it is impossible to directly use the universal UV primer suitable for PVC substrate on PP substrate. The common solution is to pre-treat the surface of PP substrate, such as corona treatment, flame treatment, chemical treatment agent treatment, etc. Corona treatment mainly produces polar groups on the non-polar surface of PP substrate, so that its interfacial tension changes, which is conducive to the adhesion of UV coating; flame treatment is to heat the PP substrate surface by flame, so that the macromolecules on the surface of PP substrate are oxidized to produce polar groups, change the interfacial tension, and thus improve the adhesion of UV coating on PP substrate. Chemical treatment agent treatment mainly pre-coats a layer of film with double-layer adhesion on the surface of PP substrate, thereby improving the adhesion of subsequent UV coating on its surface. However, no matter which method is chosen for pre-treatment, additional operation procedures are required, which will generate energy consumption and is not conducive to cost control.

[0005] In view of this, there is an urgent need to design a new PP floor bottom surface decoration material so as to overcome at least part of the above-mentioned defects of the existing PP floor bottom surface decoration material. Summary of the invention

[0006] The invention provides a UV-curing matte primer for PP floor and a preparation method thereof. The primer has a simple formula composition, is free of organic solvents, is green and environmentally friendly, has good adhesion to a PP substrate, and has good adhesion to subsequent topcoat layers. The preparation method reduces the pretreatment steps of the PP floor, makes its production process consistent with that of a traditional PVC plastic floor, greatly reduces energy consumption and production costs, greatly improves production efficiency, and has significant economic benefits.

[0007] To solve the above technical problem, according to one aspect of the present invention, the following technical solution is adopted:

[0008] A UV-curing matte primer for PP floor, the UV-curing matte primer comprising:

[0009] 10% to 20% by mass of polyurethane acrylate I;

[0010] 10% to 20% by mass of polyurethane acrylate II;

[0011] 5% to 10% by mass of an adhesion promoting resin;

[0012] 5-10% by mass of a monofunctional active monomer;

[0013] 20% to 40% by mass of a difunctional active monomer;

[0014] 0.5% to 3% by mass of a photoinitiator;

[0015] 0.1% to 2% by mass of an adhesion promoter;

[0016] Matting powder with a mass percentage of 8% to 10%;

[0017] The mass percentage of the additive is 0.1% to 2%.

[0018] As an embodiment of the present invention, the polyurethane acrylate I is at least one of trifunctional aliphatic polyurethane acrylate, tetrafunctional aliphatic polyurethane acrylate and difunctional aromatic polyurethane acrylate.

[0019] As an embodiment of the present invention, the polyurethane acrylate II is a difunctional aromatic polyurethane acrylate.

[0020] As an embodiment of the present invention, the adhesion-promoting resin is a pure acrylic resin with a low reaction rate, has extremely low shrinkage, can form a chemical bond with the surface of the substrate, and improves the adhesion between the coating and the substrate; or, the adhesion-promoting resin is a functional polyester acrylate, which has a relatively low viscosity and can improve the wetting and leveling properties of the PP substrate surface, allowing the primer to spread quickly, which is beneficial for adhesion to the substrate;

[0021] The monofunctional active monomer is at least one of hydroxyethyl methacrylate HEMA, tetrahydrofuran acrylate THFA, and isobornyl acrylate I BOA;

[0022] The isobornyl acrylate I BOA has a unique bicyclic isobornyl group, has a low curing shrinkage rate, reduces the internal stress of the coating after curing, reduces the volume shrinkage of the coating, and can form a polymer with excellent performance through free radical polymerization with other monomers, thereby improving the adhesion between the coating and the substrate and the interlayer adhesion.

[0023] As an embodiment of the present invention, the difunctional active monomer is at least one of 1,6-hexanediol diacrylate (HDDA), dipropylene glycol diacrylate (DPGDA), tripropylene glycol diacrylate (TPGDA), and propoxylated neopentyl glycol diacrylate (PO2NPGDA);

[0024] The photoinitiator is at least one of 1-hydroxycyclohexyl phenyl ketone (184), 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173), and diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide (TPO).

[0025] As an embodiment of the present invention, the adhesion promoter is one of the special modified polyester compounds TEGOLP1611 and TEGO LTH;

[0026] The matting agent is one or more of Evonik OK607, Grace ED80, and PERGOPAK M4;

[0027] The additives include defoamer AFCONA 2026 and dispersant BYK 2013.

[0028] According to another aspect of the present invention, the following technical solution is adopted: a method for preparing the above-mentioned UV-curable matte primer for PP floor, the preparation method comprising:

[0029] Step S1, mixing polyurethane acrylate I, polyurethane acrylate II, adhesion promoting resin and active monomer, and dispersing at a first speed for 10 to 15 minutes; adding an auxiliary agent, an adhesion promoter and a photoinitiator during the dispersion, and further dispersing for 5 to 10 minutes;

[0030] Step S2, after mixing evenly, dispersing at a second speed, and slowly adding the matting powder, and continuing to disperse at a third speed for 15 to 60 minutes after the matting powder is completely added;

[0031] Step S3: Filter and package using filter cloth to obtain solvent-free, treatment-free UV-curable matte primer for PP floor.

[0032] As an embodiment of the present invention, the first speed is a medium speed, and the rotation speed is 360-640 r / min;

[0033] The second speed is a low speed, with a rotation speed of 100 to 300 r / min;

[0034] The third speed is high speed, with a rotation speed of 800-2000r / min.

[0035] As an embodiment of the present invention, in step S3, the packaging is filtered using a 160-250 mesh filter cloth to obtain a solvent-free, treatment-free UV-curable matte primer for PP flooring.

[0036] The beneficial effects of the present invention are as follows: the UV-curing matte primer for PP floor and the preparation method thereof proposed by the present invention have a simple formula composition, are free of organic solvents, are green and environmentally friendly, and have good adhesion to not only the PP substrate but also the subsequent topcoat interlayer adhesion; the preparation method reduces the pretreatment steps of the PP floor, so that its production process is consistent with that of the traditional PVC plastic floor, greatly reduces energy consumption and production costs, greatly improves production efficiency, and has significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The present invention is a flowchart of a method for preparing a UV-curable matte primer for PP flooring in one embodiment of the present invention. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0039] 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.

[0040] The description in this section is only for several typical embodiments, and the present invention is not limited to the scope of the embodiments. The same or similar prior art means and some technical features in the embodiments are mutually replaced within the scope of the present invention.

[0041] The description of the steps in each embodiment in the specification is only for the convenience of explanation, and the implementation method of the present application is not limited by the order of implementation of the steps.

[0042] The present invention discloses a UV-curing matte primer for PP floor, wherein the UV-curing matte primer comprises:

[0043] 10% to 20% by mass of polyurethane acrylate I;

[0044] 10% to 20% by mass of polyurethane acrylate II;

[0045] 5% to 10% by mass of an adhesion promoting resin;

[0046] 5-10% by mass of a monofunctional active monomer;

[0047] 20% to 40% by mass of a difunctional active monomer;

[0048] 0.5% to 3% by mass of a photoinitiator;

[0049] 0.1% to 2% by mass of an adhesion promoter;

[0050] Matting powder with a mass percentage of 8% to 10%;

[0051] The mass percentage of the additive is 0.1% to 2%.

[0052] In one embodiment of the present invention, the polyurethane acrylate I is at least one of trifunctional aliphatic polyurethane acrylate, tetrafunctional aliphatic polyurethane acrylate and difunctional aromatic polyurethane acrylate; and the polyurethane acrylate II is difunctional aromatic polyurethane acrylate.

[0053] The adhesion-promoting resin may be a low-reaction pure acrylic resin, which has extremely low shrinkage and can form a chemical bond with the surface of the substrate to improve the adhesion between the coating and the substrate; the commercially available pure acrylic ester 6530B-40 of Changxing Materials Industry Co., Ltd. may be selected.

[0054] The adhesion-promoting resin may also be a functional polyester acrylate, which has a relatively low viscosity and can improve the wetting and leveling properties of the surface of the PP substrate, allowing the primer to spread rapidly and facilitating adhesion to the substrate; the commercially available polyester acrylate B-535 of Boxing Chemical can be selected;

[0055] The monofunctional active monomer is at least one of hydroxyethyl methacrylate HEMA, tetrahydrofuran acrylate THFA, and isobornyl acrylate I BOA. Among them, isobornyl acrylate I BOA can be selected as a preferred solution. The isobornyl acrylate I BOA has a unique bicyclic isobornyl group and has an extremely low curing shrinkage rate (8.2%), which can effectively reduce the internal stress of the coating after curing and reduce the volume shrinkage of the coating. At the same time, it can form a polymer with excellent performance through free radical polymerization with other monomers, thereby improving the adhesion between the coating and the substrate and the interlayer adhesion.

[0056] The difunctional active monomer may be at least one of 1,6-hexanediol diacrylate (HDDA), dipropylene glycol diacrylate (DPGDA), tripropylene glycol diacrylate (TPGDA), and propoxylated neopentyl glycol diacrylate (PO2NPGDA).

[0057] The photoinitiator may be at least one of 1-hydroxycyclohexyl phenyl ketone (184), 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173), and diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide (TPO).

[0058] The adhesion promoter may be one of the special modified polyester compounds TEGO LP1611 and TEGO LTH; the matting powder may be one or more of Evonik OK607, Grace ED80, and PERGOPAK M4; and the auxiliary agent may include a defoamer AFCONA 2026 and a dispersant BYK 2013.

[0059] The present invention further discloses a method for preparing the above-mentioned UV-curable matte primer for PP floor. Figure 1 This is a flow chart of a method for preparing a UV-curable matte primer for PP flooring in one embodiment of the present invention; please refer to Figure 1 , the preparation method comprises:

[0060] [Step S1] Mix polyurethane acrylate I, polyurethane acrylate II, adhesion promoting resin, and active monomer, and disperse at a first speed for 10 to 15 minutes; add an auxiliary agent, an adhesion promoter, and a photoinitiator during dispersion, and further disperse for 5 to 10 minutes;

[0061] [Step S2] After mixing evenly, disperse at the second speed and slowly add the matting powder. After the matting powder is completely added, continue dispersing at the third speed for 15 to 60 minutes;

[0062] [Step S3] Filter the package using a filter cloth to obtain a solvent-free, treatment-free UV-curable matte primer for PP floor. In one embodiment, filter the package using a 160-250 mesh filter cloth to obtain a solvent-free, treatment-free UV-curable matte primer for PP floor.

[0063] In one embodiment of the present invention, the first speed is a medium speed, and the rotation speed is 360 to 640 r / min (such as 500 r / min); the second speed is a low speed, and the rotation speed is 100 to 300 r / min (such as 200 r / min); the third speed is a high speed, and the rotation speed is 800 to 2000 r / min (such as 1500 r / min).

[0064] Example 1

[0065] In one embodiment of the present invention, the components and weight percentages of the UV-curable matte primer for PP floor are shown in Table 1.

[0066]

[0067]

[0068] Table 1 Components and weight percentages of UV-curable matte primer for PP floor in Example 1

[0069] In one embodiment of the present invention, the manufacturing process of the UV-curable matte primer for PP flooring includes:

[0070] Weigh the raw materials according to the recipe and set aside;

[0071] Put polyurethane acrylate I, II, adhesion promoting resin and active monomer into the black material tank, and disperse them at medium speed (500r / min) of the disperser for 10-15min;

[0072] Keep the speed (500r / min), add the photoinitiator, dispersant, defoamer, and adhesion promoter in sequence, and continue to disperse for 5 to 10 minutes;

[0073] Change the speed (200r / min), slowly add the matting powder, and after all the matting powder is added, continue dispersing at high speed (1500r / min) for 30 minutes.

[0074] The package is filtered through a 200-mesh filter cloth to obtain a solvent-free, treatment-free UV-curing matte primer for PP plastic floors.

[0075] Example 2

[0076] In one embodiment of the present invention, the components and weight percentages of the UV-curable matte primer for PP floor are shown in Table 2.

[0077]

[0078]

[0079] Table 2 Components and weight percentages of UV-curable matte primer for PP floor in Example 2

[0080] In one embodiment of the present invention, the manufacturing process of the UV-curable matte primer for PP flooring includes:

[0081] Weigh the raw materials according to the recipe and set aside;

[0082] Put polyurethane acrylate I, II, adhesion promoting resin and active monomer into the black material tank, and disperse them at medium speed (500r / min) of the disperser for 10-15min;

[0083] Keep the speed (500r / min), add the photoinitiator, dispersant, defoamer, and adhesion promoter in sequence, and continue to disperse for 5 to 10 minutes;

[0084] Change the speed (200r / min), slowly add the matting powder, and after all the matting powder is added, continue dispersing at high speed (1500r / min) for 30 minutes.

[0085] The package is filtered through a 200-mesh filter cloth to obtain a solvent-free, treatment-free UV-curing matte primer for PP plastic floors.

[0086] Example 3

[0087] In one embodiment of the present invention, the components and weight percentages of the UV-curable matte primer for PP floor are shown in Table 3.

[0088]

[0089]

[0090] Table 3 Components and weight percentages of UV-curable matte primer for PP floor in Example 3

[0091] In one embodiment of the present invention, the manufacturing process of the UV-curable matte primer for PP flooring includes:

[0092] Weigh the raw materials according to the recipe and set aside;

[0093] Put polyurethane acrylate I, II, adhesion promoting resin and active monomer into the black material tank, and disperse them at medium speed (500r / min) of the disperser for 10-15min;

[0094] Keep the speed (500r / min), add the photoinitiator, dispersant, defoamer, and adhesion promoter in sequence, and continue to disperse for 5 to 10 minutes;

[0095] Change the speed (200r / min), slowly add the matting powder, and after all the matting powder is added, continue dispersing at high speed (1500r / min) for 30 minutes.

[0096] The package is filtered through a 200-mesh filter cloth to obtain a solvent-free, treatment-free UV-curing matte primer for PP plastic floors.

[0097] Example 4

[0098] In one embodiment of the present invention, the components and weight percentages of the UV-curable matte primer for PP floor are shown in Table 4.

[0099]

[0100]

[0101] Table 4 Components and weight percentages of UV-curable matte primer for PP floor in Example 4

[0102] In one embodiment of the present invention, the manufacturing process of the UV-curable matte primer for PP flooring includes:

[0103] Weigh the raw materials according to the recipe and set aside;

[0104] Put polyurethane acrylate I, II, adhesion promoting resin and active monomer into the black material tank, and disperse them at medium speed (500r / min) of the disperser for 10-15min;

[0105] Keep the speed (500r / min), add the photoinitiator, dispersant, defoamer, and adhesion promoter in sequence, and continue to disperse for 5 to 10 minutes;

[0106] Change the speed (200r / min), slowly add the matting powder, and after all the matting powder is added, continue dispersing at high speed (1500r / min) for 30 minutes.

[0107] The package is filtered through a 200-mesh filter cloth to obtain a solvent-free, treatment-free UV-curing matte primer for PP plastic floors.

[0108] Comparative Example 1

[0109] raw materials Quality / piece Polyurethane acrylate Ⅰ 20 Polyurethane acrylate Ⅱ 20 Monofunctional reactive monomer (HEMA) 10 Difunctional reactive monomer (HDDA) 30 Photoinitiator(1173) 2.5 Adhesion promoter (TEGOLTH) 1.0 Dispersants (BYK2013) 1.0 Defoaming agent (AFCONA2026) 0.2 Matting powder (OK607) 10

[0110] Comparative Example 1 The preparation method is the same as that of the above embodiment;

[0111] Comparative Example 2

[0112]

[0113]

[0114] Comparative Example 2 The preparation method is the same as that of the above example;

[0115] Test items

[0116] The UV curing coatings prepared from the six groups of formulations of Examples 1 to 4 and Comparative Examples 1 to 2 were directly roller-coated on an untreated PP plastic floor substrate (150 mm × 150 mm × 4.3 mm), baked at 60°C for 1 min, and then exposed to a UV light source (1080 mJ / cm 2 ) After curing, a coating with a thickness of about 8 to 12 μm is obtained on the PP plastic floor substrate, and the obtained coating is tested for gloss and adhesion performance;

[0117] The UV curing coatings prepared from the six groups of formulations of Examples 1 to 4 and Comparative Examples 1 to 2 were directly roller-coated on an untreated PP plastic floor substrate (150 mm × 150 mm × 4.3 mm), baked at 60°C for 1 min, and then exposed to a UV light source (380 mJ / cm 2 ) pre-curing, continue to roll the topcoat, here we choose the laboratory homemade topcoat and the commercially purchased comparison topcoat (Changrun CU-G1006W), bake at 60℃ for 1min, and then pass through a UV light source (1080mJ / cm 2 ) to obtain a coating with a thickness of about 18 to 22 μm on the PP plastic floor substrate, and the obtained composite coating was tested for adhesion performance;

[0118] Adhesion test:

[0119] According to the provisions of GB / T 9286-1998, the grid spacing is 2mm. Use 3M 600 type adhesive tape to evenly adhere within the grid range. After compaction, peel off the tape steadily at an angle of 60° within 0.5-1s. Observe whether the coating at the edge of the grid is peeled off. The cut edge is completely smooth and no grid is peeled off, which is level 0; the peeling area is within 0-5% is level 1; the peeling area is within 5-15% is level 2; the peeling area is between 15-35% is level 3; the peeling area is between 35-65% is level 4; the peeling degree exceeds level 4, which is level 5 (for multi-layer coatings, it includes the peeling between the coating and the substrate and between the coatings).

[0120] Gloss test:

[0121] The 60° specular gloss of the coating is measured in accordance with GB / T 9754-2007 (only the primer gloss is measured).

[0122] The following is the coating adhesion test prepared in each embodiment:

[0123]

[0124] The above embodiments are only preferred embodiments of the present invention. It should be pointed out that those skilled in the art may embellish and improve the embodiments without departing from the present invention, and such embellishments and improvements should also be regarded as within the protection scope of the present invention.

[0125] It can be seen from the comparison data table that the overall adhesion test of the embodiment provided by the present invention is better than the primer provided by the comparative example.

[0126] In summary, the UV-curing matte primer for PP floor and the preparation method thereof proposed in the present invention have a simple formula composition, are free of organic solvents, are green and environmentally friendly, and have good adhesion not only to the PP substrate but also to the subsequent topcoat interlayer; the preparation method reduces the pretreatment steps of the PP floor, making its production process consistent with that of the traditional PVC plastic floor, greatly reducing energy consumption and production costs, greatly improving production efficiency, and having significant economic benefits.

[0127] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] The description and application of the present invention here are illustrative, and it is not intended to limit the scope of the present invention to the above-mentioned embodiments. The effects or advantages involved in the embodiments may not be embodied in the embodiments due to interference from various factors, and the description of the effects or advantages is not used to limit the embodiments. The deformation and change of the embodiments disclosed here are possible, and the replacement of the embodiments and the various equivalent parts are well known to those of ordinary skill in the art. It should be clear to those skilled in the art that the present invention can be implemented in other forms, structures, arrangements, proportions, and with other components, materials and parts without departing from the spirit or essential features of the present invention. Other deformations and changes can be made to the embodiments disclosed here without departing from the scope and spirit of the present invention.

Claims

1. A UV-curable matte primer for PP floor, characterized in that: The UV curing matte primer comprises: 10% to 20% by mass of polyurethane acrylate I; 10% to 20% by mass of polyurethane acrylate II; 5% to 10% by mass of an adhesion promoting resin; 5-10% by mass of a monofunctional active monomer; 20% to 40% by mass of a difunctional active monomer; 0.5% to 3% by mass of a photoinitiator; 0.1% to 2% by mass of an adhesion promoter; Matting powder with a mass percentage of 8% to 10%; The mass percentage of the additive is 0.1% to 2%.

2. The UV curing matte primer for PP floor according to claim 1, characterized in that: The polyurethane acrylate I is at least one of trifunctional aliphatic polyurethane acrylate, tetrafunctional aliphatic polyurethane acrylate and difunctional aromatic polyurethane acrylate.

3. The UV curing matte primer for PP floor according to claim 1, characterized in that: The polyurethane acrylate II is a difunctional aromatic polyurethane acrylate.

4. The UV curing matte primer for PP floor according to claim 1, characterized in that: The adhesion-promoting resin is a pure acrylic resin with a low reaction rate, has extremely low shrinkage, can form a chemical bond with the surface of the substrate, and improves the adhesion between the coating and the substrate; or, the adhesion-promoting resin is a functional polyester acrylate, which has a relatively low viscosity and can improve the wetting and leveling properties of the surface of the PP substrate, allowing the primer to spread quickly, which is beneficial for adhesion to the substrate; The monofunctional active monomer is at least one of hydroxyethyl methacrylate HEMA, tetrahydrofuran acrylate THFA, and isobornyl acrylate IBOA; The isobornyl acrylate IBOA has a unique bicyclic isobornyl group, has a low curing shrinkage rate, reduces the internal stress of the coating after curing, reduces the volume shrinkage of the coating, and can form a polymer with excellent performance through free radical polymerization with other monomers, thereby improving the adhesion between the coating and the substrate and the interlayer adhesion.

5. The UV curing matte primer for PP floor according to claim 1, characterized in that: The difunctional active monomer is at least one of 1,6-hexanediol diacrylate HDDA, dipropylene glycol diacrylate DPGDA, tripropylene glycol diacrylate TPGDA, and propoxylated neopentyl glycol diacrylate PO2NPGDA; The photoinitiator is at least one of 1-hydroxycyclohexyl phenyl ketone (184), 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173), and diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide (TPO).

6. The UV curing matte primer for PP floor according to claim 1, characterized in that: The adhesion promoter is one of the special modified polyester compounds TEGO LP1611 and TEGO LTH; The matting agent is one or more of Evonik OK607, Grace ED80, and PERGOPAK M4; The additives include defoamer AFCONA 2026 and dispersant BYK 2013.

7. A method for preparing the UV-curable matte primer for PP flooring according to any one of claims 1 to 6, characterized in that: The preparation method comprises: Step S1, mixing polyurethane acrylate I, polyurethane acrylate II, adhesion promoting resin and active monomer, and dispersing at a first speed for 10 to 15 minutes; adding an auxiliary agent, an adhesion promoter and a photoinitiator during the dispersion, and further dispersing for 5 to 10 minutes; Step S2, after mixing evenly, dispersing at a second speed, and slowly adding the matting powder, and continuing to disperse at a third speed for 15 to 60 minutes after the matting powder is completely added; Step S3: Filter and package using filter cloth to obtain solvent-free, treatment-free UV-curable matte primer for PP floor.

8. The preparation method according to claim 7, characterized in that: The first speed is a medium speed, with a rotation speed of 360 to 640 r / min; the second speed is a low speed, with a rotation speed of 100 to 300 r / min; and the third speed is a high speed, with a rotation speed of 800 to 2000 r / min.

9. The preparation method according to claim 7, characterized in that: In step S3, the mixture is filtered and packaged using a filter cloth with a mesh size of 160 to 250 to obtain a solvent-free, treatment-free UV-curable matte primer for PP flooring.

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