Antistatic polypropylene foamed floor and preparation method thereof

Abstract

The application relates to the technical field of high-molecular compound compositions, and particularly discloses an antistatic polypropylene foamed floor and a preparation method thereof. The floor comprises a substrate layer and a decorative surface layer arranged on the substrate layer, and the substrate layer comprises the following raw materials in parts by weight: 20-80 parts of antistatic polypropylene, 1-5 parts of a foaming agent, 1-2.5 parts of a foaming aid, 5-10 parts of maleic anhydride grafted polypropylene and 10-25 parts of a reinforcing agent; the antistatic polypropylene is obtained by polymerizing 2,3'-bipyridyl-5-vinyl, carboxymethyl methacrylate and acryloyloxyethyl trimethyl ammonium chloride to obtain a quaternary ammonium salt polymer, and then melt blending the quaternary ammonium salt polymer with polypropylene. Compared with the prior art, the foamed floor prepared by the application has the advantages of good antistatic effect, high safety factor, good mechanical properties and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high molecular compound compositions, in particular to an antistatic polypropylene foamed floor and a preparation method thereof. BACKGROUND

[0002] In daily life, static electricity can be seen everywhere, which is a stationary bound charge. Materials are usually electrically neutral, and the contents of positive and negative charges inside and on the surface of the material are the same. Static charge is usually generated by the mechanical action of contact and friction between two objects (which can be the same material or different materials). When contact and friction occur, the electric charge will move on the contact surface of the two objects and form a double charge layer; when the two objects are separated by a certain mechanical action, the surfaces of both objects will produce static charge, the surface of one object is negatively charged, and the surface of the other object is positively charged. The excess charge cannot dissipate or leak quickly, resulting in a static electric field on the outside of the material, thereby generating static electricity.

[0003] Polypropylene (PP) is a semi-crystalline polymer with excellent mechanical properties, heat resistance, chemical resistance and easy formability, and has been widely used in the automotive, home appliance and building industries. PP has strong electrical insulation due to its small molecular polarity and poor water absorption (surface resistivity as high as 10 16 ~ 10 18 Ω), and in the production and use process, static electricity will be generated and accumulated on the surface of the product due to friction, peeling or induction, thereby causing static electricity hazards such as dust absorption, discharge, breakdown, and even burning or explosion. Therefore, the antistatic modification of polypropylene materials has become an important direction in the field of plastic modification.

[0004] The antistatic modification of polypropylene mainly includes melt blending modification, including antistatic agent blending and conductive filler blending. Antistatic agent blending is to mix antistatic agents into the material during melt blending to disperse uniformly throughout the polymer, and then to draw a film or form a shape. After a period of time, the antistatic agent with hydrophilic groups constantly migrates to the surface of the material by the chain segment motion of the polymer, absorbs moisture in the air, and forms a water film on the surface of the product to leak the electric charge. When the antistatic agent on the surface of the material fails, the internal antistatic agent will continue to fill the interface of the material. The conductive filler method is to disperse the conductive filler in the polypropylene matrix by mixing, so that the filler forms a conductive path or network inside the polypropylene to leak the electric charge.

[0005] The anti-static agent, the anti-static floor adhesive, the preparation method of the anti-static floor adhesive, the application, the anti-static floor and the preparation method of the anti-static floor are provided in Chinese patent 202111426078.6. The anti-static agent includes tri-n-butyl methyl ammonium bis(trifluoromethyl sulfone) imine and 1-ethyl-3-methyl imidazole sulfate ethyl ester. The weight ratio of tri-n-butyl methyl ammonium bis(trifluoromethyl sulfone) imine to 1-ethyl-3-methyl imidazole sulfate ethyl ester is (7-9):(1-3). The anti-static floor adhesive includes UV photocuring acrylic resin paint, an initiator and an anti-static agent. After the anti-static agent in the application is prepared into the anti-static floor adhesive, the anti-static floor adhesive is coated on the surface of a wooden floor substrate, the wooden floor coated with the anti-static floor adhesive has more excellent and stable anti-static performance, and the anti-static floor adhesive material does not add toxic and harmful solvents and volatile organic compounds containing formaldehyde, and is an environmentally friendly floor adhesive.

[0006] Chinese patent 202210286051.X discloses a preparation method of an anti-static high-strength PP material. The preparation method of the anti-static high-strength PP material includes: (1) taking N-methyl diethanolamine and gamma-chloropropyl trimethoxysilane in a reaction kettle, using potassium iodide as a catalyst, isopropyl alcohol and methanol as polar organic solvents, heating to dissolve the raw materials uniformly, then transferring to a microwave reaction device, cooling and standing after reaction, and separating by rotary evaporation to obtain a silicone quaternary ammonium salt; (2) first drying the high-molecular anti-static agent polyether ester and the obtained silicone quaternary ammonium salt, then uniformly mixing with PP, and melt blending and extruding in a double-screw extruder to obtain an anti-static high-strength polypropylene composite material. The method of the application improves the anti-static performance of polypropylene material by adding a high-molecular anti-static agent and a small-molecular anti-static agent from the bulk phase and the surface layer of polypropylene, and improves the shortcomings of insufficient anti-static performance of polypropylene material.

[0007] Polypropylene is widely used in the construction industry due to its excellent performance in various aspects, but its defect of easily causing static hazards when used as a floor is rarely concerned, and there is little research on such technology in the prior art. At present, the anti-static modification of polypropylene material is mainly obtained by melt blending of an anti-static agent, but some anti-static agents such as quaternary ammonium salt have strong polarity, which affects the compatibility of the anti-static agent with the base resin, thereby affecting the dispersion of the anti-static agent in the polymer and directly affecting the anti-static effect. Therefore, it is of great significance to develop an anti-static agent to solve such problems and apply it to the preparation of polypropylene floor. SUMMARY

[0008] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present application is an anti-static polypropylene foam floor and a preparation method thereof.

[0009] Polymer quaternary ammonium salt antistatic agent is a kind of polymer containing quaternary ammonium salt group in main chain or branch chain. The stable ammonium cation in its structure makes the charge density of polymer increase, and the introduction of quaternary ammonium salt component enhances the polarity of polymer, promotes the transfer of charge, and the antistatic effect is very obvious. In addition, the quaternization of molecular chain also enhances the hydrophilicity of polymer, so that the polymer can better absorb moisture in the air. However, due to the difference in polarity, quaternary ammonium salt antistatic agent cannot be completely compatible with the matrix resin, so the key is to reduce the agglomeration phenomenon and make the antistatic agent uniformly dispersed in the matrix resin.

[0010] In the present application, the quaternary ammonium salt polymer is obtained by mixing 2,3'-bipyridine-5-vinyl, carboxymethyl methacrylate and acryloyloxyethyl trimethyl ammonium chloride, and then melt blending with polypropylene to obtain antistatic polypropylene. The prepared quaternary ammonium salt polymer has good compatibility with polypropylene, so the dispersibility is good. In addition, the bipyridyl group introduced in the structure of the quaternary ammonium salt polymer can form a more suitable path for ion conduction, thus facilitating the reduction of resistivity. At the same time, the carboxyl group in the structure can form a hydrogen bond network with the pyridyl group, further expanding the conduction path. The addition of carboxyl group can also enhance the water absorption of the polymer, promote the dissociation of quaternary ammonium cation, and enhance the antistatic effect. The hydroxyl oxygen of the carboxyl group on the carboxymethyl methacrylate is sp 3 hybrid, which can form coordination effect with N atom in acryloyloxyethyl trimethyl ammonium chloride, so as to more effectively dissociate quaternary ammonium cation, thus further improving the ionic conductivity. The application of antistatic polypropylene to polypropylene floor can obtain an antistatic and dustproof floor material, which has good mechanical properties and high safety factor, and has wide application prospect.

[0011] To achieve the above object, the present application provides an antistatic polypropylene foam floor, which comprises a substrate layer and a decorative surface layer arranged on the substrate layer. The substrate layer comprises the following raw materials in parts by weight: antistatic polypropylene 20-80 parts, foaming agent 1-5 parts, foaming aid 1-2.5 parts, maleic anhydride grafted polypropylene 5-10 parts, reinforcing agent 10-25 parts. The antistatic polypropylene is a quaternary ammonium salt polymer obtained by polymerizing 2,3'-bipyridine-5-vinyl, carboxymethyl methacrylate and acryloyloxyethyl trimethyl ammonium chloride, and then melt blending with polypropylene.

[0012] The preparation method of the antistatic polypropylene comprises the following steps:

[0013] S1 2,3'-bipyridine-5-ethenyl 1-3 parts by weight, carboxymethyl methacrylate 6-15 parts by weight, acryloyloxyethyl trimethyl ammonium chloride 15-25 parts by weight are added to 100-500 parts by weight of anhydrous ethanol, stirred and mixed uniformly under a nitrogen atmosphere, 0.1-1 parts by weight of azobisisobutyronitrile is added, heated to 70-85 DEG C, then stirred for 4-8 hours, reduced to room temperature, concentrated under reduced pressure, the volume is concentrated to 1 / 4 of the original, then added to toluene, precipitate is separated out, filtered, the residue is dried to obtain a quaternary ammonium salt polymer;

[0014] S2 15-25 parts by weight of the quaternary ammonium salt polymer, polypropylene 75-85 parts by weight are mixed uniformly, then extruded and granulated at 190-220 DEG C, dried to obtain an antistatic polypropylene.

[0015] Further, the foaming agent is selected from one or a mixture of two of AC foaming agent and NC foaming agent.

[0016] Further, the foaming aid is zinc oxide.

[0017] Further, the reinforcing agent is light calcium carbonate.

[0018] A preparation method of an antistatic polypropylene foamed floor comprises the following steps:

[0019] After the raw materials in the substrate layer are stirred and mixed uniformly, heated mixing is carried out at 110-140 DEG C, then cold mixing and cooling are carried out, micro-foamed substrate is obtained by extrusion, and the substrate layer is obtained by extrusion setting, hot pressing of the substrate layer and the decorative surface layer is carried out, then slitting, grooving and packaging are carried out to obtain the floor.

[0020] The beneficial effects of the present application are as follows:

[0021] Compared with the prior art, the quaternary ammonium salt polymer obtained by the present application has good compatibility with polypropylene, good dispersibility, good absorbability and good ion conduction efficiency, and therefore has good antistatic effect, the floor prepared by melt blending the quaternary ammonium salt polymer with polypropylene can prevent static electricity and dust, has a higher safety factor, and has a wide application prospect. DETAILED DESCRIPTION

[0022] 2,3'-bipyridine-5-ethenyl, 2,3'-Bipyridine, 5-ethenyl-, CAS No.: 78210-81-8.

[0023] Carboxymethyl methacrylate, CAS No.: 6852-90-0.

[0024] Acryloyloxyethyl trimethyl ammonium chloride, CAS No.: 44992-01-0.

[0025] Polypropylene, model: T300, Shanghai Petrochemical.

[0026] PVC transparent layer, item number: FGT-PT, Jiangsu Feichi New Material.

[0027] Maleic anhydride grafted polypropylene, model: ZJ-900P, Zhongjie Chemical.

[0028] Comparative Example 1

[0029] A preparation method of an antistatic polypropylene foam floor, comprising the following steps:

[0030] After the antistatic polypropylene 7.5 kg, the AC foaming agent 125 g, the zinc oxide 185 g, the maleic anhydride grafted polypropylene 0.8 kg and the light calcium carbonate 2 kg are uniformly stirred and mixed, the mixture is heated and mixed at 120 DEG C, and then cooled and mixed, the micro-foamed base material is obtained through extrusion, the base material layer is obtained through extrusion setting, and the base material layer is hot-pressed with the PVC transparent layer, then cutting, slotting and packaging are performed to obtain the antistatic polypropylene foam floor.

[0031] The preparation method of the antistatic polypropylene comprises the following steps:

[0032] After 150 g of octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate and 850 g of polypropylene are uniformly mixed, the mixture is extruded, granulated and dried at 210 DEG C to obtain the antistatic polypropylene.

[0033] Example 1

[0034] A preparation method of an antistatic polypropylene foam floor, comprising the following steps:

[0035] After the antistatic polypropylene 7.5 kg, the AC foaming agent 125 g, the zinc oxide 185 g, the maleic anhydride grafted polypropylene 0.8 kg and the light calcium carbonate 2 kg are uniformly stirred and mixed, the mixture is heated and mixed at 120 DEG C, and then cooled and mixed, the micro-foamed base material is obtained through extrusion, the base material layer is obtained through extrusion setting, and the base material layer is hot-pressed with the PVC transparent layer, then cutting, slotting and packaging are performed to obtain the antistatic polypropylene foam floor.

[0036] The preparation method of the antistatic polypropylene comprises the following steps:

[0037] S1 2,3'-dipyridyl-5-vinyl 180 g, carboxymethyl methacrylate 1.3 kg, acryloyloxyethyl trimethyl ammonium chloride 1.9 kg are added to 30 L anhydrous ethanol, and then 50 g of azobisisobutyronitrile is added under nitrogen atmosphere, and the mixture is stirred and mixed uniformly, and then heated to 75 DEG C and stirred for 8 h, and then cooled to room temperature, and then concentrated under reduced pressure to concentrate the volume to 1 / 4 of the original volume, and then added to toluene, and then precipitated, and then filtered, and then the residue is dried at 85 DEG C for 8 h to obtain the quaternary ammonium salt polymer;

[0038] S2 mix 1.5 kg quaternary ammonium salt polymer, 8.5 kg polypropylene uniformly, then extrude, granulate and dry at 210℃ to obtain the antistatic polypropylene.

[0039] Example 2

[0040] A method for preparing the antistatic polypropylene foam floor comprises the following steps:

[0041] Mix 7.5 kg antistatic polypropylene, 125 g AC foaming agent, 185 g zinc oxide, 0.8 kg maleic anhydride grafted polypropylene and 2 kg light calcium carbonate uniformly, then heat mix at 120℃, cool mix and cool, extrude to obtain the micro-foamed base material, then extrude to obtain the base material layer, heat press the base material layer and the PVC transparent layer, then cut, slot and package to obtain the antistatic polypropylene foam floor.

[0042] The method for preparing the antistatic polypropylene comprises the following steps:

[0043] S1 add 180 g styrene, 1.3 kg carboxymethyl methacrylate and 1.9 kg acryloyloxyethyl trimethyl ammonium chloride into 30 L anhydrous ethanol, mix uniformly under stirring in nitrogen atmosphere, then add 50 g azobisisobutyronitrile, heat to 75℃, stir for 8 h, reduce to room temperature, concentrate under reduced pressure to 1 / 4 of the original volume, then add into toluene, filter the precipitate, dry the residue at 85℃ for 8 h to obtain the quaternary ammonium salt polymer;

[0044] S2 mix 1.5 kg quaternary ammonium salt polymer, 8.5 kg polypropylene uniformly, then extrude, granulate and dry at 210℃ to obtain the antistatic polypropylene.

[0045] Example 3

[0046] A method for preparing the antistatic polypropylene foam floor comprises the following steps:

[0047] Mix 7.5 kg antistatic polypropylene, 125 g AC foaming agent, 185 g zinc oxide, 0.8 kg maleic anhydride grafted polypropylene and 2 kg light calcium carbonate uniformly, then heat mix at 120℃, cool mix and cool, extrude to obtain the micro-foamed base material, then extrude to obtain the base material layer, heat press the base material layer and the PVC transparent layer, then cut, slot and package to obtain the antistatic polypropylene foam floor.

[0048] The method for preparing the antistatic polypropylene comprises the following steps:

[0049] S1 2,3'-dipyridyl-5-vinyl 180g, hydroxyethyl methacrylate 1.3kg, acryloyloxyethyl trimethyl ammonium chloride 1.9kg were added into 30L anhydrous ethanol, after stirring and mixing uniformly under nitrogen atmosphere, 50g azobisisobutyronitrile was added, after heating to 75℃, stirring for 8h, reducing to room temperature, concentrating under reduced pressure, the volume was concentrated to 1 / 4 of the original, then added into toluene, precipitate was separated out, filtered, the residue was dried at 85℃ for 8h to obtain quaternary ammonium salt polymer;

[0050] S2 1.5kg quaternary ammonium salt polymer, polypropylene 8.5kg were mixed uniformly, then extruded and granulated at 210℃, dried to obtain antistatic polypropylene.

[0051] Example 4

[0052] A preparation method of antistatic polypropylene foamed floor comprises the following steps:

[0053] Antistatic polypropylene 7.5kg, AC foaming agent 125g, zinc oxide 185g, maleic anhydride grafted polypropylene 0.8kg, light calcium carbonate 2kg were stirred and mixed uniformly, then after hot mixing at 120℃, cold mixing and cooling, the micro-foamed substrate was obtained by extrusion, and the substrate layer was obtained by extrusion setting, then after hot pressing with PVC transparent layer, slitting, grooving and packaging, the antistatic polypropylene foamed floor was obtained.

[0054] The preparation method of the antistatic polypropylene comprises the following steps:

[0055] S1 2,3'-dipyridyl-5-vinyl 180g, carboxymethyl methacrylate 1.3kg, acryloyloxyethyl trimethyl ammonium chloride 1.9kg were added into 30L anhydrous ethanol, after stirring and mixing uniformly under nitrogen atmosphere, 50g azobisisobutyronitrile was added, after heating to 75℃, stirring for 8h, reducing to room temperature, concentrating under reduced pressure, the volume was concentrated to 1 / 4 of the original, then added into toluene, precipitate was separated out, filtered, the residue was dried at 85℃ for 8h to obtain quaternary ammonium salt polymer;

[0056] S2 1.8kg quaternary ammonium salt polymer, polypropylene 8.5kg were mixed uniformly, then extruded and granulated at 210℃, dried to obtain antistatic polypropylene.

[0057] Example 5

[0058] A preparation method of antistatic polypropylene foamed floor comprises the following steps:

[0059] The antistatic polypropylene 7.5 kg, AC foaming agent 125 g, zinc oxide 185 g, maleic anhydride grafted polypropylene 0.8 kg, light calcium carbonate 2 kg are uniformly mixed and stirred, then heated to 120℃, cooled after cold mixing, and then extruded to obtain a micro-foamed base material, and then extruded to obtain a base material layer. The base material layer and the PVC transparent layer are hot-pressed, then cut, grooved and packaged to obtain the product.

[0060] The preparation method of the antistatic polypropylene comprises the following steps:

[0061] S1 2,3'-dipyridyl-5-vinyl 180 g, carboxymethyl methacrylate 1.3 kg, acryloyloxyethyl trimethyl ammonium chloride 1.9 kg are added to 30 L anhydrous ethanol, stirred uniformly under nitrogen atmosphere, then 50 g of azobisisobutyronitrile is added, heated to 75℃, stirred for 8 h, cooled to room temperature, concentrated under reduced pressure, the volume is concentrated to 1 / 4 of the original, then added to toluene, precipitate is separated out, filtered, the residue is dried at 85℃ for 8 h to obtain a quaternary ammonium salt polymer;

[0062] S2 2 kg of the quaternary ammonium salt polymer and 8.5 kg of polypropylene are uniformly mixed, then extruded and granulated at 210℃, and dried to obtain the antistatic polypropylene.

[0063] Test Example 1

[0064] The surface resistivity of the polypropylene foamed floor is measured according to the method in GB / T 31838.3-2019 "Dielectric and Resistance Properties of Solid Insulating Materials Part 3: Resistance Properties (DC Method) Surface Electrical Specifications" in a specific environment (23℃, relative humidity 50%). The test voltage is set to 500 V. The sample is placed in an environment of 23℃ and relative humidity of 50% for 24 h before testing.

[0065] Table 1 Surface resistivity of polypropylene foamed floor

[0066] Experimental protocol Surface resistivity / Ω Comparative Example 1 6.2 x 10 11 ]] Example 1 4.5 x 10 9 ]]> Example 2 3.5 x 10 10 ]]> Example 3 4.1 x 10 10 ]]> Example 4 4.3 x 10 9 ]]> Example 5 4.1 x 10 9 ]]

[0067] The antistatic agent used in the preparation of the antistatic polypropylene in Comparative Example 1 is octadecane dimethyl hydroxyethyl quaternary ammonium nitrate, which is a small molecule antistatic agent and has poor compatibility with the high molecular polymer. Therefore, it is usually coated on the surface of the high molecular polymer to achieve the antistatic effect by adsorbing moisture in the air. Due to the poor compatibility with the polypropylene matrix resin, the surface resistivity in Comparative Example 1 is relatively large. In the examples, the quaternary ammonium salt polymer contains stable ammonium cations, which increases the charge density of the polymer. The introduction of the quaternary ammonium salt component enhances the polarity of the polymer, promoting the transfer of electric charge, and the antistatic effect is very obvious. In addition, the quaternization of the molecular chain also enhances the hydrophilicity of the polymer, so that the polymer can better absorb moisture in the air, thus the surface resistivity is lower. Compared with Example 1 and Examples 2-3, the quaternary ammonium salt polymer obtained has a bipyridine structure, which can form a more suitable ion conduction channel, thus facilitating the reduction of resistivity. In addition, compared with Example 2, the carboxyl group on the structure of the quaternary ammonium salt polymer in Example 1 can form a hydrogen bond network with the pyridyl group, further expanding the conduction channel. The addition of carboxyl group can also enhance the water absorption of the polymer and promote the dissociation of quaternary ammonium cations, thus enhancing the antistatic effect. The hydroxyl oxygen on the carboxymethyl group of the methacrylic acid carboxymethyl ester can form a coordination effect with the N atom in the acryloyloxyethyl trimethyl ammonium chloride, thus more effectively dissociating the quaternary ammonium cation, and thus further improving the ion conductivity. In Examples 4-5, the continuous reduction of the surface conductivity is caused by the increase of the amount of quaternary ammonium salt polymer. However, when the amount of quaternary ammonium salt polymer is too large, it will cause unevenness in the interior of the polypropylene, thus forming defects and causing a decrease in mechanical properties. Therefore, the balance between antistatic and mechanical properties is the best solution. 3 Hybrid, can form a coordination effect with the N atom in the acryloyloxyethyl trimethyl ammonium chloride, thus more effectively dissociating the quaternary ammonium cation, and thus further improving the ion conductivity. In Examples 4-5, the continuous reduction of the surface conductivity is caused by the increase of the amount of quaternary ammonium salt polymer. However, when the amount of quaternary ammonium salt polymer is too large, it will cause unevenness in the interior of the polypropylene, thus forming defects and causing a decrease in mechanical properties. Therefore, the balance between antistatic and mechanical properties is the best solution.

[0068] Test Example 2

[0069] The mechanical properties of the prepared polypropylene foam floor were tested according to the test methods in GB / T 1040.1-2018 "Determination of tensile properties of plastics - Part 1: General principles" and GB / T 1043.1-2008 "Determination of impact properties of plastics - Part 1: Non-instrumented impact test". The specific test results are shown in Table 2.

[0070] Table 2 Mechanical properties test of polypropylene foam floor

[0071] Experimental protocol Tensile strength / MPa Impact strength / kJ / m 2 ]] Comparative Example 1 21.4 4.2 Example 1 27.5 7.5 Example 2 26.3 6.8 Example 3 26.5 7.0 Example 4 22.0 5.1 Example 5 18.6 3.4

[0072] From the results of the mechanical property test, it can be seen that the compatibility of the quaternary ammonium salt and the polypropylene directly affects the final mechanical test results, and from the comparison of Examples 1-5, it can be found that when the addition amount of the quaternary ammonium salt polymer increases, the mechanical properties will decrease accordingly, which may be due to the fact that the quaternary ammonium salt polymer is aggregated in the polypropylene to form defects, which are easy to produce "cavities" under external force, so the tensile strength and impact strength decrease significantly.

[0073] The foregoing detailed description of the preferred embodiments of the application has been presented. It is understood that modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Therefore, any technical solutions obtained by those skilled in the art on the basis of the concept of the present application through logical analysis, reasoning or limited experiments shall be within the scope of protection determined by the claims.

Claims

1. An antistatic polypropylene foam floor, characterized in that: The invention comprises a base material layer and a decorative surface layer provided on the base material layer; the base material layer comprises the following raw materials in parts by weight: 20-80 parts of antistatic polypropylene, 1-5 parts of a foaming agent, 1-2.5 parts of a foaming aid, 5-10 parts of maleic anhydride grafted polypropylene, and 10-25 parts of a reinforcing agent; the decorative surface layer is a transparent PVC layer; The preparation method of the antistatic polypropylene comprises the following steps: S1: 1-3 parts by weight of 2,3'-bipyridyl-5-vinyl, 6-15 parts by weight of carboxymethyl methacrylate, and 15-25 parts by weight of acryloyloxyethyltrimethylammonium chloride are added to 100-500 parts by weight of anhydrous ethanol, and the mixture is stirred and mixed uniformly under a nitrogen atmosphere. 0.1-1 parts by weight of azobisisobutyronitrile is then added, and the mixture is heated to 70-85° C. and stirred for 4-8 hours. The mixture is cooled to room temperature and concentrated under reduced pressure to a quarter of the original volume. The mixture is then added to toluene to precipitate. The mixture is filtered and the residue is dried to obtain a quaternary ammonium salt polymer. S2: 15 parts by weight of quaternary ammonium salt polymer and 75-85 parts by weight of polypropylene are uniformly mixed, and then extruded into granules at 190-220° C. and dried to obtain antistatic polypropylene.

2. The polypropylene foam floor according to claim 1, characterized in that: The foaming agent is selected from one of AC foaming agent and NC foaming agent or a mixture of the two.

3. The polypropylene foam floor according to claim 1, wherein: The foaming auxiliary agent is zinc oxide.

4. The polypropylene foam floor according to claim 1, wherein: The reinforcing agent is light calcium carbonate.

5. A method for preparing the polypropylene foam floor according to any one of claims 1 to 4, characterized in that: The steps include: The raw materials in the base material layer are stirred and mixed evenly, hot mixed at 110-140°C, cold mixed and cooled, and then extruded to obtain a micro-foamed base material, which is then extruded and shaped to obtain a base material layer. The base material layer and the decorative surface layer are hot pressed, and then cut, slotted and packaged.