A multilayer antibacterial SPC plate and a preparation process thereof

Abstract

The application discloses a multilayer antibacterial SPC plate and a preparation process thereof, relates to the technical field of SPC floors, and comprises, from bottom to top, an SPC antibacterial base material layer, a color film layer, an antibacterial wear-resistant layer and an antibacterial UV coating which are sequentially attached; the SPC antibacterial base material layer comprises, in terms of weight fractions, 52-64 parts of polyvinyl chloride resin, 110-132 parts of calcium carbonate, 3.3-4.2 parts of a calcium-zinc stabilizer, 10-14 parts of a modified antibacterial plasticizer and 0.3-0.6 parts of a lubricant. The application realizes the purpose of effectively and durably achieving antibacterial function.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of SPC floor, in particular to a multi-layer antibacterial SPC board and a preparation process thereof. BACKGROUND

[0002] SPC floor is a new type of floor, also known as stone plastic floor. The base material of SPC floor is a composite board made of stone powder and thermoplastic polymer material after stirring and high-temperature extrusion. It has the performance and characteristics of both wood and plastic, ensuring the strength and toughness of the floor.

[0003] The Chinese patent application file with publication number CN114350246A discloses a multifunctional finish for SPC floor. The multifunctional finish for SPC floor includes the following components by weight fraction: hexaurethane acrylate 2-5%, nonaurethane acrylate 25-30%, monomer 20-30%, matte powder 12-15%, wax powder 2-5%, photoinitiator 3-5%, dispersing agent 3-5%, defoaming agent 0.2-0.5%, leveling agent 0.1-0.3%, anti-settling agent 1-2%, wear-resistant aid 12-16%, stain-resistant aid 3-5%, mildew-resistant and antibacterial aid 0.5-2%, and solvent 5-10%.

[0004] However, the multifunctional finish for SPC floor uses mildew-resistant and antibacterial aid in the surface finish composition to achieve antibacterial performance. After the finish is damaged and comes into contact with bacteria or the bottom substrate is affected by bacteria, the antibacterial effect of the SPC floor will be severely affected, which will seriously affect the quality of life and needs to be improved. SUMMARY

[0005] Therefore, the first purpose of the present application is to provide a multi-layer antibacterial SPC board to achieve the purpose of effective and durable antibacterial function. The specific scheme is as follows:

[0006] A multi-layer antibacterial SPC board includes, from bottom to top, an SPC antibacterial base material layer, a color film layer, an antibacterial wear-resistant layer, and an antibacterial UV coating layer. The SPC antibacterial base material layer includes, by weight fraction, 52-64 parts of polyvinyl chloride resin, 110-132 parts of calcium carbonate, 3.3-4.2 parts of calcium-zinc stabilizer, 10-14 parts of modified antibacterial plasticizer, and 0.3-0.6 parts of lubricant. The modified antibacterial plasticizer has the following structure:

[0007]

[0008] wherein R is an ethyl acetate group, M is -C2H5, -C4H9, -C6H 13 , or -C8H 17 .

[0009] Preferably, the bottom of the SPC substrate layer is provided with a shock-absorbing bottom layer.

[0010] Preferably, the lubricant is polyethylene wax or a mixture of polyethylene wax and at least one of stearic acid, oleic acid, lauric acid, and palmitic acid.

[0011] A second object of the present application is to improve a preparation process of a multi-layer antibacterial SPC plate, comprising the following steps:

[0012] Step 1, uniformly mixing 52-64 parts by weight of polyvinyl chloride resin, 110-132 parts of calcium carbonate, 3.3-4.2 parts of calcium-zinc stabilizer, 10-14 parts of modified antibacterial plasticizer, and 0.3-0.6 parts of lubricant, then feeding into an extruder for extrusion molding, and obtaining the SPC antibacterial substrate layer after cooling and cutting;

[0013] Step 2, sequentially pressing the SPC antibacterial substrate layer with the color film layer, the antibacterial wear-resistant layer, and the antibacterial UV coating layer to obtain the multi-layer antibacterial SPC plate.

[0014] Preferably, the preparation of the modified antibacterial plasticizer comprises the following steps:

[0015] Step 1, using dimethyl phthalate as a raw material to obtain 4-bromodimethyl phthalate through substitution reaction;

[0016] Step 2, mixing 4-bromodimethyl phthalate with piperazine in an organic solvent for substitution reaction to allow piperazine to substitute bromine to obtain a substitution product;

[0017] Step 3, reacting the substitution product with hydrochloric acid to obtain a chlorination product;

[0018] Step 4, reacting the chlorination product with trialkyl phosphine to obtain a quaternary phosphonium salt product;

[0019] Step 5, reacting the quaternary phosphonium salt product with ethyl chloroacetate to obtain the modified antibacterial plasticizer.

[0020] Preferably, in Step 1, the substitution reaction is carried out at 20°C for 6-8h using NaBrO3 and 65% sulfuric acid.

[0021] Preferably, the mixing ratio of NaBrO3, 65% sulfuric acid, and dimethyl phthalate in the reaction is 16-18g:88-95ml:14-16g.

[0022] Preferably, in Step 2, the substitution product has the following structure:

[0023]

[0024] The organic solvent is MeCN, and the temperature is controlled at 5-18℃ for 22-28h.

[0025] Preferably, in step 3, the chlorination reagent has the following structure:

[0026]

[0027] Preferably, in step 4, the trialkyl phosphine is triethyl phosphine, tributyl phosphine, trihexyl phosphine or trioctyl phosphine, the reaction is treated with light, radiation, ultraviolet or plasma radiation, and the quaternary phosphonium salt reagent has the following structure:

[0028]

[0029] wherein M is -C2H5, -C4H9, -C6H 13 or -C8H 17 .

[0030] Preferably, in step 5, the reaction is controlled in an alcohol solvent at a temperature of 80-100℃ and a pressure of 0.01MPa, and the quaternary phosphonium salt reagent is obtained after removing the alcohol solvent and ethyl chloroacetate by reduced pressure distillation; and the alcohol solvent is controlled to be greater than 20% of the total mass.

[0031] As can be seen from the above scheme, the application provides a multi-layer antibacterial SPC plate and a preparation process thereof. The multi-layer antibacterial SPC plate realizes effective antibacterial effect by adopting the combination of the SPC antibacterial base material layer, the antibacterial wear-resistant layer and the antibacterial UV coating, and the addition of the modified antibacterial plasticizer in the SPC antibacterial base material layer realizes effective improvement of the high-temperature stability and antibacterial performance of the SPC antibacterial base material layer. The preparation process of the multi-layer antibacterial SPC plate optimizes the preparation structure, uses dimethyl phthalate as a raw material to prepare the modified antibacterial plasticizer, has the effects of convenient process and effective cost control, and makes the prepared modified antibacterial plasticizer not only significantly improve the antibacterial performance by the effective grafting of the quaternary phosphonium salt group and the quaternary ammonium salt group, but also significantly improve the structural stability of the SPC antibacterial base material layer, which is suitable for laying of floor heating and realizes the purpose of environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only embodiments of the application, and those skilled in the art can obtain other drawings according to the provided drawings without any creative effort.

[0033] Figure 1A schematic view of the structure of the multilayer antibacterial SPC plate disclosed in the present application.

[0034] Legend: 1, SPC antibacterial substrate layer; 2, color film layer; 3, antibacterial wear-resistant layer; 4, antibacterial UV coating. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] It should be noted that the color film layer in the present application is prepared by using existing components, which will not be described here. The antibacterial wear-resistant layer and the antibacterial UV coating are both prepared by adding existing antibacterial agents such as nano-silver superfine powder on the basis of existing components, which will not be described here.

[0037] The multilayer antibacterial SPC plate and its preparation process of the present application will be described in detail below.

[0038] As shown in Figure 1 A multilayer antibacterial SPC plate includes, from bottom to top, an SPC antibacterial substrate layer, a color film layer, an antibacterial wear-resistant layer, and an antibacterial UV coating. The SPC antibacterial substrate layer includes, by weight fraction, 52-64 parts of polyvinyl chloride resin, 110-132 parts of calcium carbonate, 3.3-4.2 parts of calcium-zinc stabilizer, 10-14 parts of modified antibacterial plasticizer, and 0.3-0.6 parts of lubricant. The modified antibacterial plasticizer has the following structure:

[0039]

[0040] wherein R is ethyl acetate group, M is -C2H5, -C4H9, -C6H 13 or -C8H 17 .

[0041] The lubricant is polyethylene wax or a mixture of polyethylene wax and at least one of stearic acid, oleic acid, lauric acid, and palmitic acid.

[0042] A preparation process of a multilayer antibacterial SPC plate includes the following steps:

[0043] Step 1, uniformly mixing 52-64 parts by weight of polyvinyl chloride resin, 110-132 parts of calcium carbonate, 3.3-4.2 parts of calcium-zinc stabilizer, 10-14 parts of modified antibacterial plasticizer and 0.3-0.6 parts of lubricant, then feeding into an extruder for extrusion molding, and obtaining SPC antibacterial substrate layer after cooling and cutting;

[0044] Step 2, sequentially molding the SPC antibacterial substrate layer with the color film layer, the antibacterial wear-resistant layer and the antibacterial UV coating layer to obtain a multi-layer antibacterial SPC plate.

[0045] The modified preparation of the modified antibacterial plasticizer comprises the following steps:

[0046] Step 1, using dimethyl phthalate as raw material, NaBrO3 and 65% sulfuric acid for reaction at 20℃ for 6-8h to obtain 4-bromodimethyl phthalate by substitution reaction, and the mixing ratio of NaBrO3, 65% sulfuric acid and dimethyl phthalate in the reaction is controlled to be 16-18g:88-95ml:14-16g;

[0047] Step 2, mixing 4-bromodimethyl phthalate with piperazine in an organic solvent MeCN and controlling the temperature to be 5-18℃ for 22-28h to allow piperazine to replace bromine to obtain a substitution product;

[0048] Step 3, reacting the substitution product with hydrochloric acid to obtain a chlorination product;

[0049] Step 4, reacting the chlorination product with trialkyl phosphine to obtain a quaternary phosphonium salt product, and the trialkyl phosphine is triethyl phosphine, tributyl phosphine, trihexyl phosphine or trioctyl phosphine, and the reaction uses light, radiation, ultraviolet or plasma radiation treatment;

[0050] Step 5, reacting the quaternary phosphonium salt product with ethyl chloroacetate in an alcohol solvent, controlling the temperature to be 80-100℃ and the pressure to be 0.01MPa, and then removing the alcohol solvent and ethyl chloroacetate by reduced pressure distillation to obtain the modified antibacterial plasticizer, and the alcohol solvent is controlled to be greater than 20% of the total mass.

[0051] It should be noted that the substitution product has the following structure: The chlorination product has the following structure: The quaternary phosphonium salt product has the following structure: And M is -C2H5, -C4H9, -C6H 13 Or -C8H 17 The alcohol solvent is ethylene glycol and / or propylene glycol.

[0052] Example one

[0053] As Figure 1As shown, a multilayer antibacterial SPC plate material includes SPC antibacterial substrate layer, color film layer, antibacterial wear-resistant layer and antibacterial UV coating which are sequentially attached from bottom to top. The SPC antibacterial substrate layer includes 52 parts by weight of polyvinyl chloride resin, 110 parts of calcium carbonate, 3.3 parts of calcium zinc stabilizer, 10 parts of modified antibacterial plasticizer and 0.3 parts of polyethylene wax. And the modified antibacterial plasticizer has the following structure:

[0054]

[0055] Wherein, R is ethyl acetate group, M is -C2H5.

[0056] A preparation process of a multilayer antibacterial SPC plate material includes the following steps:

[0057] Step 1, mix 52 parts by weight of polyvinyl chloride resin, 110 parts of calcium carbonate, 3.3 parts of calcium zinc stabilizer, 10 parts of modified antibacterial plasticizer and 0.3 parts of polyethylene wax uniformly, then put into the extruder for extrusion molding, and cut after cooling to obtain SPC antibacterial substrate layer;

[0058] Step 2, sequentially press the SPC antibacterial substrate layer, color film layer, antibacterial wear-resistant layer and antibacterial UV coating to obtain a multilayer antibacterial SPC plate material.

[0059] Among them, the modified preparation of the modified antibacterial plasticizer includes the following steps:

[0060] Step 1, using dimethyl phthalate as raw material, NaBrO3 and 65% sulfuric acid are used to react at 20℃ for 6h to obtain 4-bromophthalic acid dimethyl ester by substitution reaction, and the mixing ratio of NaBrO3, 65% sulfuric acid and dimethyl phthalate in the reaction is controlled to be 16g:88ml:14g;

[0061] Step 2, mix 4-bromophthalic acid dimethyl ester with piperazine in organic solvent MeCN, and control the temperature to be 5℃ for 28h to allow piperazine to replace bromine group to obtain a substitution reaction product;

[0062] Step 3, react the substitution reaction product with hydrochloric acid to obtain a chlorination reaction product;

[0063] Step 4, react the chlorination reaction product with trialkyl phosphine to obtain a quaternary phosphonium salt reaction product, and the trialkyl phosphine is triethyl phosphine, and the reaction uses light treatment;

[0064] Step 5, react the quaternary phosphonium salt reaction product with ethyl chloroacetate in ethylene glycol, control the temperature to be 80℃, the pressure to be 0.01MPa, and after removing ethylene glycol and ethyl chloroacetate by reduced pressure distillation, the modified antibacterial plasticizer is obtained, and the control of ethylene glycol is 22.6% of the total mass.

[0065] It should be noted that the substituted reactants have the following structures: The chlorination reactants have the following structures: The quaternization reactants have the following structures: And M is -C2H5.

[0066] Example 2

[0067] like Figure 1 As shown, a multi-layer antibacterial SPC sheet includes, from bottom to top, an SPC antibacterial substrate layer, a color film layer, an antibacterial wear-resistant layer, and an antibacterial UV coating. The SPC antibacterial substrate layer, by weight, comprises 56 parts polyvinyl chloride resin, 122 parts calcium carbonate, 3.7 parts calcium-zinc stabilizer, 12 parts modified antibacterial plasticizer, and 0.4 parts of an equal mass mixture of polyethylene wax and stearic acid. The modified antibacterial plasticizer has the following structure:

[0068]

[0069] Wherein, R is ethyl acetate group and M is -C4H9.

[0070] A process for preparing a multilayer antibacterial SPC board includes the following steps:

[0071] Step 1: Mix 56 parts by weight of polyvinyl chloride resin, 122 parts by weight of calcium carbonate, 3.7 parts by weight of calcium zinc stabilizer, 12 parts by weight of modified antibacterial plasticizer, and 0.4 parts by weight of an equal mass of polyethylene wax and stearic acid mixture evenly, then put it into an extruder for extrusion molding, and obtain the SPC antibacterial substrate layer after cooling and cutting.

[0072] Step 2: Press the SPC antibacterial substrate layer, color film layer, antibacterial wear-resistant layer, and antibacterial UV coating layer sequentially to obtain a multi-layer antibacterial SPC board.

[0073] The modification and preparation of the modified antibacterial plasticizer includes the following steps:

[0074] Step 1: Using dimethyl phthalate as a raw material, NaBrO3 and 65% sulfuric acid were reacted at 20°C for 7 hours to obtain 4-bromodimethyl phthalate through a substitution reaction. At the same time, the mixing ratio of NaBrO3, 65% sulfuric acid and dimethyl phthalate in the reaction was controlled to be 16.6g:90ml:14.4g.

[0075] Step 2: Mix dimethyl 4-bromophthalate with piperazine in an organic solvent (MeCN) and react at 12°C for 26 hours to allow the piperazine to replace the bromine group and obtain the substituted reactant.

[0076] Step 3, reacting the substituted reactant with hydrochloric acid to obtain a chlorinated reactant;

[0077] Step 4, reacting the chlorinated reactant with a trialkyl phosphine to obtain a quaternary phosphonium salt reactant, and the trialkyl phosphine is tributyl phosphine, and the reaction is treated with radiation;

[0078] Step 5, reacting the quaternary phosphonium salt reactant with ethyl chloroacetate in propylene glycol, controlling the temperature to be 90°C, the pressure to be 0.01 MPa, and after removing propylene glycol and ethyl chloroacetate by reduced pressure distillation, a modified antibacterial plasticizer is obtained, and the control propylene glycol is 26% of the total mass.

[0079] It should be noted that the substituted reactant has the following structure: The chlorinated reactant has the following structure: The quaternary phosphonium salt reactant has the following structure: And M is -C4H9.

[0080] Example Three

[0081] As shown in the following structure, a modified antibacterial plasticizer is prepared by modifying an antibacterial plasticizer: Figure 1 A multilayer antibacterial SPC board, including SPC antibacterial substrate layer, color film layer, antibacterial wear-resistant layer and antibacterial UV coating which are sequentially attached from bottom to top. The SPC antibacterial substrate layer includes, by weight fraction, 64 parts of polyvinyl chloride resin, 132 parts of calcium carbonate, 4.2 parts of calcium zinc stabilizer, 14 parts of modified antibacterial plasticizer, and 0.6 parts of a mixture of equal mass of polyethylene wax and oleic acid. And the modified antibacterial plasticizer has the following structure:

[0082]

[0083] Wherein, R is ethyl acetate group, M is -C6H 13 .

[0084] A preparation process of a multilayer antibacterial SPC board, including the following steps:

[0085] Step 1, mixing 64 parts of polyvinyl chloride resin, 132 parts of calcium carbonate, 4.2 parts of calcium zinc stabilizer, 14 parts of modified antibacterial plasticizer, and 0.6 parts of a mixture of equal mass of polyethylene wax and oleic acid by weight fraction, then feeding into an extruder for extrusion molding, and cooling and cutting to obtain an SPC antibacterial substrate layer;

[0086] Step 2, sequentially pressing the SPC antibacterial substrate layer, color film layer, antibacterial wear-resistant layer, and antibacterial UV coating to obtain a multilayer antibacterial SPC board.

[0087] Among them, the modified preparation of the modified antibacterial plasticizer includes the following steps:

[0088] Step 1, dimethyl phthalate as raw material, using NaBrO3 and 65% sulfuric acid, reaction at 20℃ for 8h by substitution reaction to obtain 4-bromine dimethyl phthalate, while controlling the mixing ratio of NaBrO3, 65% sulfuric acid and dimethyl phthalate in the reaction is 18g:95ml:16g;

[0089] Step 2, 4-bromine dimethyl phthalate is mixed with piperazine in an organic solvent MeCN, and the temperature is controlled at 18℃ for 22h, so that piperazine replaces bromine to obtain a substitution reaction product;

[0090] Step 3, the substitution reaction product is reacted with hydrochloric acid to obtain a chlorination reaction product;

[0091] Step 4, the chlorination reaction product is reacted with trialkyl phosphine to obtain a quaternary phosphonium salt reaction product, and the trialkyl phosphine is trihexyl phosphine, and the reaction is treated with ultraviolet rays;

[0092] Step 5, the quaternary phosphonium salt reaction product is reacted with ethyl chloroacetate in ethylene glycol, the temperature is controlled at 100℃, the pressure is 0.01MPa, and after the ethylene glycol and ethyl chloroacetate are removed by reduced pressure distillation, the modified antibacterial plasticizer is obtained, and the ethylene glycol is controlled at 31% of the total mass.

[0093] It should be noted that the substitution reaction product has the following structure: The chlorination reaction product has the following structure: The quaternary phosphonium salt reaction product has the following structure: And M is -C6H 13 .

[0094] Example four

[0095] The difference between example four and example one is that the bottom of the SPC substrate layer of example four is provided with a shock absorbing bottom layer.

[0096] Comparative example one

[0097] The difference between comparative example one and example two is that comparative example one uses dimethyl phthalate and nano-silver superfine powder instead of modified antibacterial plasticizer.

[0098] Comparative example two

[0099] The difference between comparative example two and example two is that the modified antibacterial plasticizer in comparative example two is not treated by step 5, that is, the quaternary phosphonium salt reaction product is used as the modified antibacterial plasticizer.

[0100] Comparative example three

[0101] The difference between comparative example three and comparative example one is that comparative example three does not add nano-silver superfine powder.

[0102] The performance tests of Example 1 to Example 4 and Comparative Example 1 to Comparative Example 3 are as follows:

[0103] According to the "QBT 2591-2003 Anti-bacterial Plastic Anti-bacterial Performance Test Method and Anti-bacterial Effect", the anti-bacterial performance test is carried out, and the experiment is carried out based on the method specified in Appendix A and Appendix B.

[0104] The high temperature stability test is carried out based on the ambient temperature of 70℃ and the thickness of 4mm, and is divided into I, II, III, IV and V according to the results from bad to good.

[0105] The performance test results are shown in Table 1 as follows:

[0106] Table 1 Performance test results of Example 1 to Example 4 and Comparative Example 1 to Comparative Example 3

[0107] Antibacterial rate Mold rating High temperature stability Example One 96.9％ 0 grade V Example Two 97.5％ 0 grade V Example Three 96.4％ 0 grade V Example Four 97.0％ 0 grade V Comparative Example One 86.4％ 1 grade II Comparative Example Two 93.4％ 1 grade III Comparative Example Three 52.7％ 2 grade II

[0108] It can be obtained from Table 1 that the multi-layer anti-bacterial SPC board of the application is modified by optimizing the plasticizer dimethyl phthalate, grafting quaternary phosphonium salt groups and forming quaternary ammonium salt groups on the dimethyl phthalate, and the modified anti-bacterial plasticizer obtained by modifying the form of covalent bond connection functional groups has significantly improved anti-bacterial and anti-mold performance, while effectively improving the high temperature stability, thereby prolonging the service life.

[0109] In summary, the application provides a multi-layer anti-bacterial SPC board and its preparation process. The multi-layer anti-bacterial SPC board realizes effective anti-bacterial effect by adopting the combination of SPC anti-bacterial substrate layer, anti-bacterial wear-resistant layer and anti-bacterial UV coating, and adding modified anti-bacterial plasticizer in the SPC anti-bacterial substrate layer will effectively improve the high temperature stability and anti-bacterial performance of the SPC anti-bacterial substrate layer. The preparation process of the multi-layer anti-bacterial SPC board optimizes the preparation structure, uses dimethyl phthalate as raw material to prepare modified anti-bacterial plasticizer, has the effect of convenient process and effective cost control, and makes the modified anti-bacterial plasticizer prepared by effectively grafting quaternary phosphonium salt groups and quaternary ammonium salt groups not only achieve significantly improved anti-bacterial performance, but also significantly improve the structural stability of the SPC anti-bacterial substrate layer, which is suitable for laying of floor heating and realizes the purpose of environmental protection.

[0110] The use of "first", "second", "third", "fourth" etc. (if any) in this disclosure is only to distinguish similar objects, and does not necessarily indicate a particular order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods or devices.

[0111] It should be noted that the description involving "first", "second" etc. in this application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed in this application.

[0112] The principles and implementation modes of the present application are described by applying specific examples herein, and the above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in specific implementation modes and application scope, and the above description of the present application should not be understood as a limitation.

Claims

1. A multi-layered antibacterial SPC panel, characterized in that: It comprises SPC antibacterial substrate layer, color film layer, antibacterial wear-resistant layer and antibacterial UV coating which are sequentially attached from bottom to top; the SPC antibacterial substrate layer comprises 52-64 parts by weight of polyvinyl chloride resin, 110-132 parts by weight of calcium carbonate, 3.3-4.2 parts by weight of calcium-zinc stabilizer, 10-14 parts by weight of modified antibacterial plasticizer and 0.3-0.6 parts by weight of lubricant; the modified antibacterial plasticizer has the following structure: ； wherein R is ethyl acetate group, M is -C2H5, -C4H9, -C6H 13 or -C8H 17 ; The preparation of the modified antibacterial plasticizer comprises the following steps: Step 1: using dimethyl phthalate as raw material, 4-bromophthalic acid dimethyl ester is obtained through substitution reaction; Step 2: 4-bromophthalic acid dimethyl ester is mixed with piperazine in an organic solvent to substitute bromine with piperazine to obtain a substitution product; Step 3: the substitution product is reacted with hydrochloric acid to obtain a chlorination product; Step 4: the chlorination product is reacted with trialkyl phosphine to obtain a quaternary phosphonium salt product; Step 5: the quaternary phosphonium salt product is reacted with ethyl chloroacetate to obtain the modified antibacterial plasticizer.

2. The multi-layered antibacterial SPC panel according to claim 1, characterized in that: The bottom of the SPC antibacterial substrate layer is provided with a shock-absorbing bottom layer.

3. The multi-layered antibacterial SPC panel according to claim 1, characterized in that: The lubricant is polyethylene wax or a mixture of polyethylene wax and at least one of stearic acid, oleic acid, lauric acid and palmitic acid.

4. The multi-layered antibacterial SPC panel according to claim 1, characterized in that: In step 1, the substitution reaction is carried out at 20℃ for 6-8h using NaBrO3 and 65% sulfuric acid; the mixing ratio of NaBrO3, 65% sulfuric acid and dimethyl phthalate in the reaction is 16-18g:88-95ml:14-16g.

5. The multi-layered antibacterial SPC panel according to claim 1, characterized in that: In step 2, the substitution product has the following structure: ； The organic solvent is MeCN, and the temperature is controlled at 5-18℃ for 22-28h.

6. The multi-layered antibacterial SPC panel according to claim 1, characterized in that: In step 3, the chlorination product has the following structure: 。 7. The multi-layered antibacterial SPC panel according to claim 1, characterized in that: In step 4, the trialkyl phosphine is triethyl phosphine, tributyl phosphine, trihexyl phosphine or trioctyl phosphine, and the reaction is treated by light, radiation, ultraviolet or plasma radiation; and the quaternary phosphonium salt product has the following structure: ； wherein M is -C2H5, -C4H9, -C6H 13 or -C8H 17 .

8. The multi-layered antibacterial SPC panel according to claim 1, characterized in that: In step 5, the reaction is carried out in an alcohol solvent at a temperature of 80-100℃ and a pressure of 0.01MPa; after the alcohol solvent and ethyl chloroacetate are removed by reduced pressure distillation, the modified antibacterial plasticizer is obtained; and the alcohol solvent accounts for more than 20% of the total mass.

9. A process for the preparation of a multilayer antibacterial SPC panel for the preparation of a multilayer antibacterial SPC panel according to any one of claims 1 to 8, characterized in that, It comprises the following steps: Step 1: uniformly mix 52-64 parts by weight of polyvinyl chloride resin, 110-132 parts by weight of calcium carbonate, 3.3-4.2 parts by weight of calcium-zinc stabilizer, 10-14 parts by weight of modified antibacterial plasticizer and 0.3-0.6 parts by weight of lubricant, then put them into an extruder for extrusion molding, and then cut after cooling to obtain the SPC antibacterial substrate layer; Step 2: sequentially press the SPC antibacterial substrate layer, color film layer, antibacterial wear-resistant layer and antibacterial UV coating to obtain a multi-layer antibacterial SPC plate.

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