Plastic floor tile structure and manufacturing method thereof

Abstract

The invention discloses a plastic floor tile structure and a manufacturing method thereof. The plastic floor tile structure comprises a bottom layer, a middle layer and a surface layer, wherein the middle layer is arranged between the bottom layer and the surface layer. The intermediate layer is formed from a resin composition. The resin composition includes 100 parts by weight of a polyvinyl chloride resin, 5 to 20 parts by weight of a plasticizer, 4 to 15 parts by weight of a thermally stable composition, 0.5 to 3 parts by weight of an accelerator, 1 to 5 parts by weight of a flexibilizer, 0.1 to 0.5 part by weight of a lubricant composition, and 0.1 to 1 part by weight of an antioxidant. The heat-stable composition comprises a calcium-zinc stabilizer and an auxiliary stabilizer, and the accelerant is a copolymer synthesized from a vinyl chloride monomer and a polyester monomer.

Description

Technical Field

[0001] The present application relates to a plastic floor tile structure and a manufacturing method thereof, and particularly to an environment-friendly plastic floor tile structure and a manufacturing method thereof. Background Art

[0002] Plastic floor tiles are a very popular floor decoration material in recent years and are widely used in various places, such as: homes, hospitals, office buildings, factories, gymnasiums and other places. Compared with traditional floor tiles, plastic floor tiles can be mass-produced and also have the advantage of light weight. Therefore, plastic floor tiles have better convenience in transportation and installation.

[0003] In existing plastic floor tiles, most are added with tin-based stabilizers or barium-zinc-based stabilizers to improve the heat resistance of plastic floor tiles. However, among tin-based stabilizers or barium-zinc-based stabilizers, there are phenolic substances such as bisphenol A, nonylphenol or phenol. These phenolic substances are not only not environmentally friendly but also harmful to the human body. Therefore, whether considering environmental protection or safety, efforts should be made to eliminate the use of the above harmful phenolic substances.

[0004] At present, there are relatively environmentally friendly stabilizers on the market, such as: calcium-zinc stabilizers or hydrotalcite stabilizers. However, after adding calcium-zinc stabilizers or hydrotalcite stabilizers, the gelation rate of the resin composition will be reduced, resulting in a decrease in production capacity. If the resin composition is not completely gelled, it will also have a negative impact on the printability of plastic floor tiles. And after long-term use, the surface of plastic floor tiles is prone to plastic precipitation or the formation of whitening patterns.

[0005] Therefore, how to improve the properties of the resin composition for manufacturing plastic floor tiles through ingredient improvement to overcome the above defects has become one of the important issues to be solved in this industry. Summary of the Invention

[0006] The technical problem to be solved by the present application is to provide a plastic floor tile structure and a manufacturing method thereof in view of the deficiencies of the prior art.

[0007] To solve the above technical problems, one of the technical solutions adopted by the present invention is to provide a plastic floor tile structure. The plastic floor tile structure includes a bottom layer, an intermediate layer and a surface layer, and the intermediate layer is disposed between the bottom layer and the surface layer. The intermediate layer is formed by a resin composition, and the resin composition includes 100 parts by weight of polyvinyl chloride resin, 5 to 20 parts by weight of plasticizer, 4 to 15 parts by weight of heat stabilizer composition, 0.5 to 3 parts by weight of accelerator, 1 to 5 parts by weight of toughening agent, 0.1 to 0.5 parts by weight of lubricant composition and 0.1 to 1 part by weight of antioxidant. The heat stabilizer composition contains a calcium-zinc stabilizer and a co-stabilizer, and the accelerator is a copolymer synthesized from vinyl chloride monomer and polyol ester monomer.

[0008] Furthermore, the degree of polymerization of the polyvinyl chloride resin is from 700 to 1000.

[0009] Furthermore, based on 100 parts by weight of the polyvinyl chloride resin, the content of the calcium-zinc stabilizer is from 3 to 10 parts by weight, and the content of the auxiliary stabilizer is from 1 to 5 parts by weight.

[0010] Furthermore, the auxiliary stabilizer is selected from the group consisting of epoxidized soybean oil, dibenzoylmethane, and stearoylbenzoylmethane.

[0011] Furthermore, based on the total amount of the vinyl chloride monomer and the polyol ester monomer of the synthesis promoter being 100% by weight, the content of the vinyl chloride monomer is from 65% to 85% by weight.

[0012] Furthermore, the promoter-modified functional group is selected from the group consisting of vinyl, vinylidene chloride, vinyl acetate, vinyl versatate, and acrylate.

[0013] Furthermore, the promoter modification has vinylidene chloride and vinyl versatate or the promoter modification has vinylidene chloride and acrylate.

[0014] Furthermore, based on the total weight of the promoter being 100% by weight, the promoter modification has 10% to 15% by weight of vinyl or vinylidene chloride.

[0015] Furthermore, based on the total weight of the promoter being 100% by weight, the promoter modification has 5% to 15% by weight of vinyl acetate, vinyl versatate, or acrylate.

[0016] Furthermore, the lubricant composition includes an internal lubricant and an external lubricant, and the weight ratio of the internal lubricant to the external lubricant is from 3:7 to 7:3.

[0017] Furthermore, the internal lubricant is selected from the group consisting of fatty alcohols, fatty acid esters, and fatty acid amides.

[0018] Furthermore, the external lubricant is selected from the group consisting of carboxylic ester wax, polyethylene wax, and oxidized polyethylene wax.

[0019] Furthermore, the material of the bottom layer includes polyvinyl chloride, and the material of the surface layer includes polyvinyl chloride.

[0020] Furthermore, the thickness of the bottom layer is from 0.2 mm to 0.5 mm, the thickness of the intermediate layer is from 0.05 mm to 0.15 mm, and the thickness of the surface layer is from 2 mm to 7 mm.

[0021] To solve the above technical problems, another technical solution adopted by the present invention is to provide a manufacturing method for a plastic floor tile structure. The manufacturing method for the plastic floor tile structure includes the following steps: preparing a mixture to form a dry powder; cooling the dry powder to a temperature of 80°C to 120°C while stirring; cooling to mix the mixture at a temperature of 35°C to 50°C to obtain a resin composition; using the resin composition to process and form an intermediate layer; and performing a lamination process to dispose the intermediate layer between a bottom layer and a surface layer to produce the plastic floor tile structure. The mixture includes: 100 parts by weight of polyvinyl chloride resin, 5 to 20 parts by weight of plasticizer, 4 to 15 parts by weight of heat stabilizer composition, 0.5 to 3 parts by weight of accelerator, 1 to 5 parts by weight of toughening agent, 0.1 to 0.5 parts by weight of lubricant composition, and 0.1 to 1 part by weight of antioxidant; wherein, the heat stabilizer composition contains calcium zinc stabilizer and auxiliary stabilizer, and the accelerator is a copolymer synthesized from vinyl chloride monomer and polyester monomer.

[0022] One of the beneficial effects of the present invention is that the plastic floor tile structure and its manufacturing method provided by the present invention can, through the technical solutions of "the heat stabilizer composition contains calcium zinc stabilizer and auxiliary stabilizer" and "the accelerator is a copolymer synthesized from vinyl chloride monomer and polyester monomer", enable the resin composition to have a faster gelling rate, and further enable the intermediate layer to have a good printing effect.

[0023] To further understand the features and technical content of the present application, please refer to the following detailed description and drawings of the present application. However, the provided drawings are only for reference and illustration, and are not used to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a side view schematic diagram of the plastic floor tile structure of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following are specific examples to illustrate the embodiments of the present invention regarding "plastic floor tile structure and its manufacturing method" disclosed by the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. Additionally, the drawings of the present invention are only simple schematic illustrations and are not drawn according to actual dimensions, which is stated in advance. The following embodiments will further detail the related technical content of the present invention, but the disclosed content is not used to limit the protection scope of the present invention. Additionally, the term "or" used herein should, depending on the actual situation, possibly include any one or a combination of multiple related listed items.

[0026] In order to make plastic floor tiles meet the requirements of environmental protection and safety, the present invention improves the composition of the resin composition using calcium-zinc stabilizer to achieve the same characteristic specifications as conventional plastic floor tiles.

[0027] Please refer to Figure 1 As shown, the structure of the plastic floor tile of the present invention includes a bottom layer 1, an intermediate layer 2 and a surface layer 3, and the intermediate layer 2 is disposed between the bottom layer 1 and the surface layer 3.

[0028] The material of the bottom layer 1 is polyvinyl chloride. In some embodiments, recycled polyvinyl chloride crushed material can be used and admixed with calcium carbonate as the material of the bottom layer 1. The thickness of the bottom layer 1 can be 0.2 mm to 0.5 mm.

[0029] The intermediate layer 2 of the present invention is formed by a resin composition, and the resin composition includes: 100 parts by weight of polyvinyl chloride resin, 5 parts by weight to 20 parts by weight of plasticizer, 4 parts by weight to 15 parts by weight of heat stabilizer composition, 0.5 parts by weight to 3 parts by weight of accelerator, 1 part by weight to 5 parts by weight of toughening agent, 0.1 parts by weight to 0.5 parts by weight of lubricant composition, 0.1 parts by weight to 1 part by weight of antioxidant and 0.1 parts by weight to 20 parts by weight of pigment. The thickness of the intermediate layer 2 can be 0.05 mm to 0.15 mm.

[0030] The material of the surface layer 3 is polyvinyl chloride. Specifically, the surface layer 3 can be a semi-rigid transparent polyvinyl chloride adhesive tape coated with a hardening treatment layer. The thickness of the surface layer 3 can be 2 mm to 7 mm.

[0031] [Polyvinyl chloride resin]

[0032] The present invention selects polyvinyl chloride resin with a degree of polymerization (DP) of 700 to 1000. Specifically, the polyvinyl chloride resin can be polyvinyl chloride prepared by bulk polymerization or mass polymerization or suspension polymerization. Alternatively, the polyvinyl chloride resin may also include polyvinyl chloride prepared by bulk polymerization and polyvinyl chloride prepared by suspension polymerization.

[0033] When the degree of polymerization of the polyvinyl chloride resin is higher than 1000, it is not conducive to production due to excessive molecular weight. When the degree of polymerization of the polyvinyl chloride resin is lower than 700, the intermediate layer made of the polyvinyl chloride resin may have problems with insufficient mechanical strength. Therefore, in order to balance productivity and the mechanical strength of the intermediate layer 2, the degree of polymerization of the polyvinyl chloride resin is preferably 750 to 900, more preferably 750 to 850.

[0034] [Plasticizer]

[0035] Since polyvinyl chloride is a rigid plastic, plasticizers can be added to achieve the purpose of reshaping. The addition of plasticizers can soften or gelatinize polyvinyl chloride resin, so that it can be evenly mixed with other components and has the property of being plasticizable.

[0036] In order to avoid the problems that the surface of plastic floor tiles is likely to precipitate plastic or form whitening streaks after long-term use, the present invention reduces the addition amount of plasticizers and additionally adds accelerators to help soften or gelatinize polyvinyl chloride resin. Specific descriptions of the accelerators will be described later.

[0037] The plasticizer is selected from the group consisting of 1,2-cyclohexane dicarboxylic acid, di-isononyl ester (DHIN), dioctyl terephthalate (DOTP), triisoctyl trimellitate (TOTM), and cyclohexanedicarboxylic acid diisononyl ester (DIHCN).

[0038] [Heat Stabilizer Composition]

[0039] In order to overcome the problems that phenolic substances such as bisphenol A, nonylphenol, or phenol are contained in tin-based stabilizers or barium-zinc-based stabilizers, resulting in environmental unfriendliness and safety concerns, the present invention selects a heat stabilizer composition without phenolic substances.

[0040] The heat stabilizer composition of the present invention includes a calcium-zinc stabilizer and a co-stabilizer. The calcium-zinc stabilizer can be a liquid calcium-zinc stabilizer or a powder calcium-zinc stabilizer. Preferably, both the liquid calcium-zinc stabilizer and the powder calcium-zinc stabilizer are added simultaneously, which can improve the appearance of the intermediate layer.

[0041] In order to overcome the problem that the resin composition has incomplete gelatinization caused by the calcium-zinc stabilizer, the present invention reduces the addition amount of the calcium-zinc stabilizer. Also, in order to make up for the reduced calcium-zinc stabilizer, a co-stabilizer is additionally added so that the resin composition can maintain a certain degree of heat resistance. In this way, by adding the heat stabilizer composition, the problems derived from using the calcium-zinc stabilizer alone can be solved.

[0042] The co-stabilizer is selected from the group consisting of epoxidized soybean oil, dibenzoylmethane (DBM), and stearoylbenzoylmethane (SBM). In the exemplary embodiments, the co-stabilizer includes epoxidized soybean oil and dibenzoylmethane.

[0043] Based on 100 parts by weight of polyvinyl chloride resin, the addition amount of the calcium-zinc stabilizer is 3 to 10 parts by weight. The addition amount of the calcium-zinc stabilizer is lower than that of general stabilizers. For example, the addition amount of the calcium-zinc stabilizer can be 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight or 9 parts by weight. Similarly, based on 100 parts by weight of polyvinyl chloride resin, the addition amount of the auxiliary stabilizer is 1 to 5 parts by weight. For example, the addition amount of the auxiliary stabilizer can be 2 parts by weight, 3 parts by weight or 4 parts by weight.

[0044] [Accelerator]

[0045] As mentioned above, after reducing the plasticizer and using the calcium-zinc stabilizer, the gelling rate of the polyvinyl chloride resin will be affected. Therefore, the present invention adds an accelerator to assist in the gelling process.

[0046] The accelerator is a high-molecular-weight polymer, which can increase the friction force of the resin composition system. During the mixing process, the increase in friction force will make the resin composition have a higher heating rate, and thus reach a higher gelling rate. In addition, the addition of the accelerator can also improve the printability of the intermediate layer 2 to make up for the reduced printability due to the use of the calcium-zinc stabilizer.

[0047] Specifically, the accelerator is a copolymer synthesized from vinyl chloride monomer and polyester monomer. Based on the total amount of vinyl chloride monomer and polyester monomer being 100% by weight, the content of vinyl chloride monomer is 65% to 85% by weight.

[0048] In the exemplary embodiment, the accelerator modification has a functional group, and the functional group can assist in the gelation of the polyvinyl chloride resin and help form a resin composition with uniform components. The accelerator can effectively improve the problem of the polyvinyl chloride resin precipitating at the die orifice, and has both lubricating and impact-resistant characteristics, and can reduce the addition amounts of external lubricants and impact-resistant modifiers. The functional group includes at least one of vinyl group, vinylidene chloride group, vinyl acetate group, vinyl versatate group and acrylate group.

[0049] When the functional group is a vinyl group or a vinylidene chloride group, the weight ratio of the functional group in the accelerator is 10% to 15% by weight. When the functional group is a vinyl acetate group, a vinyl versatate group or an acrylate group, the weight ratio of the functional group in the accelerator is 5% to 15% by weight.

[0050] In the exemplary embodiment, the accelerator modification has one of a vinyl group and a vinylidene chloride group, and further, the accelerator modification has one of a vinyl acetate group, a vinyl versatate group and an acrylate group.

[0051] For example, the promoter can simultaneously modify a vinylidene chloride group and a vinyl versatate group. The weight ratio of the vinylidene chloride group in the promoter is 10% to 15% by weight, and the weight ratio of the vinyl versatate group in the promoter is 5% to 15% by weight. Alternatively, the promoter can simultaneously modify a vinylidene chloride group and an acrylate group. The weight ratio of the vinylidene chloride group in the promoter is 10% to 15% by weight, and the weight ratio of the acrylate group in the promoter is 5% to 15% by weight.

[0052] Based on 100 parts by weight of the polyvinyl chloride resin, the addition amount of the promoter can be 1 part by weight, 1.5 parts by weight, 2 parts by weight, or 2.5 parts by weight.

[0053] [Toughening agent]

[0054] The addition of the toughening agent can improve the mechanical strength of the intermediate layer 2, so as to reduce the abnormality rate in subsequent processing steps and improve the durability of the plastic floor tile structure.

[0055] Specifically, the toughening agent can be acrylate elastomer (ACR), methyl methacrylate-butadiene-styrene elastomer (MBS), or chlorinated polyethylene (CPE), but the present invention is not limited thereto.

[0056] [Lubricant composition]

[0057] The lubricant composition includes an internal lubricant and an external lubricant.

[0058] The addition of the internal lubricant can promote the gelation of the polyvinyl chloride resin and simultaneously reduce the friction between the polyvinyl chloride resin molecules, thereby achieving the effects of reducing the processing torque and improving the thermal stability of the resin composition.

[0059] It is worth noting that the addition of both the promoter and the internal lubricant can achieve the effect of promoting the gelation of the polyvinyl chloride resin. In addition to the effect of promoting the gelation of the polyvinyl chloride resin, the addition of the promoter will increase the intermolecular friction, while the addition of the internal lubricant can reduce the intermolecular friction. Therefore, in the case of simultaneously adding the promoter and the internal lubricant in the present invention, the effect of doubling the acceleration of the gelation of the polyvinyl chloride resin can be achieved without affecting the original intermolecular friction.

[0060] The addition of the external lubricant can reduce the friction between the rubber particles and the mechanical equipment to improve productivity. However, when the addition amount of the external lubricant is too large, the printability of the intermediate layer will decrease. It has been found through experiments that the addition of the promoter in the present invention can improve the printability of the intermediate layer. Therefore, even if an external lubricant is added to the resin composition of the present invention, the intermediate layer can still have good printability.

[0061] In the exemplary embodiment, the weight ratio of the internal lubricant to the external lubricant is from 3:7 to 7:3. Specifically, the internal lubricant is selected from the group consisting of fatty alcohols, fatty acid esters and fatty acid amides. The external lubricant is selected from the group consisting of carboxylic ester waxes, polyethylene waxes and oxidized polyethylene waxes.

[0062] [Antioxidant]

[0063] The addition of an antioxidant can prevent the middle layer from yellowing during long-term use, which affects the appearance of the product. The antioxidant is a hindered phenol antioxidant, a phosphite antioxidant or a combination thereof.

[0064] For example, the hindered phenol antioxidant can be of model 1010 or 1076 antioxidant. The phosphite antioxidant can be pentaerythritol bisphosphite, tris(2,4-di-tert-butylphenyl) phosphite or a combination thereof, for example: an antioxidant of model 168 antioxidant.

[0065] [Composite pigment]

[0066] The addition of the composite pigment can determine the color of the plastic floor tile structure. For convenient printing, a white pigment can be selected. For example: calcium carbonate, titanium dioxide, aluminum oxide, silicon dioxide or a combination thereof.

[0067] Specifically, the composite pigment has a core layer and a shell layer covering the core layer. For example, the shell layer can be selected from anatase titanium dioxide or rutile titanium dioxide. Among them, rutile titanium dioxide has better weather resistance. The shell layer can also be surface-modified. For example: the shell layer can be modified to have aluminum oxide or silicon dioxide.

[0068] In addition, calcium carbonate can be selected for the core layer. That is to say, the composite pigment is preferably calcium carbonate coated with titanium dioxide. In the exemplary embodiment, the particle size of the composite pigment can be from 1 micron to 5 microns, and the specific gravity of the composite pigment is from 2.6 to 3.5.

[0069] It is worth noting that the size of the conventional titanium dioxide pigment is about 200 nanometers. Since the cost of titanium dioxide is relatively high, using large-sized titanium dioxide as a pigment is less cost-effective. Therefore, the use of the composite pigment in the present invention can enable the resin composition to have an ideal appearance color at a lower cost, and further enable the middle layer to have better printability.

[0070] [Manufacturing method of plastic floor tile structure]

[0071] The manufacturing method of the plastic floor tile structure of the present invention includes the following steps: a formulation step (step S1), a high-temperature mixing step (step S2), a low-temperature mixing step (step S3), an extrusion molding step (step S4), and a lamination step (step S5).

[0072] In step S1, 100 parts by weight of polyvinyl chloride resin, 5 to 20 parts by weight of plasticizer, 4 to 15 parts by weight of heat stabilizer composition, 0.5 to 3 parts by weight of accelerator, 1 to 5 parts by weight of toughening agent, 0.1 to 0.5 parts by weight of lubricant composition, 0.1 to 1 part by weight of antioxidant, and 0.1 to 20 parts by weight of pigment are weighed according to the aforementioned ratio to obtain a mixture.

[0073] In step S2, the mixture is put into the mixing tank of a mixer and stirred at a high speed at a temperature of 80°C to 120°C until evenly mixed to form a mixed powder, and the mixed powder is in a dry and loose state. Then, the mixed powder is discharged into a cold mixing barrel.

[0074] In step S3, the mixed powder is cooled to 35°C to 50°C under stirring to obtain a resin composition.

[0075] In step S4, the resin composition is processed and molded at a temperature of 170°C to 210°C through a ten-thousand-horsepower machine, a rolling machine, a filtering extruder, and a tape machine to produce an intermediate layer 2.

[0076] In step S5, the intermediate layer 2 is disposed between the bottom layer 1 and the surface layer 3 and laminated and fixed to form a plastic floor tile structure. Specifically, the intermediate layer 2 is fixed between the bottom layer 1 and the surface layer 3 by thermal lamination, that is to say, the plastic floor tile structure of the present invention does not require the use of adhesives. Since the main components of the bottom layer 1, the intermediate layer 2, and the surface layer 3 are all polyvinyl chloride, they have a good bonding effect with each other.

[0077] [Experimental data]

[0078] In order to confirm that the intermediate layer of the present invention has good properties and can be applied to the plastic floor tile structure, the intermediate layers of Examples 1 to 4 and Comparative Examples 1 and 2 are prepared according to the above steps S1 to S3, and the component ratios of the resin compositions forming the intermediate layers are listed in Table 1. In Table 1, Pigment 1 refers to a composite pigment with a titanium dioxide shell and a calcium carbonate core. The accelerator is purchased from Wangwang Company (model: VTER).

[0079] Moreover, the tensile strength, tear strength, plasticization rate, and balance torque of the intermediate layer are tested, and in addition, the tape hue, processability, and ink printability of the intermediate layer are evaluated, and the results are listed in Table 2.

[0080] In Table 2, the tensile strength of the intermediate layer was measured using a universal tensile testing machine according to the ASTM D638 standard test method. The tear strength of the intermediate layer was measured using a universal tensile testing machine according to the ASTM D1004 standard test method. The gelation rate and balance torque of the intermediate layer were measured using a torque rheometer, and the gelation rate at a temperature of 180°C was tested. A gelation rate less than 20 seconds was considered to meet the requirements.

[0081] In Table 2, the appearance of the adhesive tape was used to evaluate whether the appearance of the intermediate layer met expectations. "Good" means that the surface of the intermediate layer has no coarse particles or flow marks, "Acceptable" means that the surface of the intermediate layer has no coarse particles but has slight flow marks, and "Poor" means that the surface of the intermediate layer has coarse particles and flow marks.

[0082] In Table 2, the hue of the adhesive tape was used to evaluate the heat resistance of the resin composition. The resin composition was placed in a rolling mill at a temperature of 190°C for 40 minutes, and it was evaluated whether the value of the total color difference (delta E) was less than 5. "Good" means that the color difference value of the intermediate layer before and after being placed in the rolling mill is less than 5, "Acceptable" means that the color difference value of the intermediate layer before and after being placed in the rolling mill is between 5 and 8, and "Poor" means that the color difference value of the intermediate layer before and after being placed in the rolling mill is greater than 8.

[0083] In Table 1, the printing adhesion was used to evaluate the printing fastness of the intermediate layer. "Good" means that after the intermediate layer was adhered with a 3M (model: 610) tape and quickly torn off, the printing layer did not peel off. "Fair" means that after the intermediate layer was adhered with a 3M (model: 610) tape and quickly torn off, a small part of the printing layer peeled off.

[0084] Table 1

[0085]

[0086]

[0087] Table 2

[0088]

[0089]

[0090] From the results of Table 1 and Table 2, it can be seen that the intermediate layer made of the resin composition of the present invention has a tensile strength of 480 kg / cm 2 to 540 kg / cm 2 a tear strength of 25 kg / mm to 32 kg / mm, and a balance torque of 7 N·m to 12 N·m. That is to say, the intermediate layer has sufficient mechanical strength and can be used to manufacture the plastic floor tile structure.

[0091] In addition, through the adjustment of components, even if an environmentally friendly heat stabilizer (calcium-zinc stabilizer) without phenols is used, the resin composition of the present invention can still have a relatively fast gelling rate. Accordingly, the problem of poor printability of the intermediate layer caused by incomplete gelling of the resin composition can be avoided.

[0092] [Advantages of the embodiments]

[0093] One of the advantages of the present invention is that the plastic floor tile structure and its manufacturing method provided by the present invention can make the resin composition have a relatively fast gelling rate through the technical solutions of "the heat stabilizer composition contains a calcium-zinc stabilizer and a co-stabilizer" and "the promoter is a copolymer synthesized from a vinyl chloride monomer and a polyol ester monomer", and further make the intermediate layer have a good printing effect.

[0094] The content disclosed above is only the preferred feasible embodiments of the present application, and does not limit the protection scope of the claims of the present application. Therefore, all equivalent technical changes made by using the content of the specification and drawings of the present application are included in the protection scope of the claims of the present application.

Claims

1. A plastic floor tile structure, characterized in that, the plastic floor tile structure comprises: a bottom layer; a middle layer formed of a resin composition, the resin composition comprising: 100 parts by weight of polyvinyl chloride resin, 5 to 20 parts by weight of a plasticizer, 4 to 15 parts by weight of a heat stabilizer composition, 0.5 to 3 parts by weight of an accelerator, 1 to 5 parts by weight of a toughening agent, 0.1 to 0.5 parts by weight of a lubricant composition, and 0.1 to 1 part by weight of an antioxidant; wherein the heat stabilizer composition comprises a calcium-zinc stabilizer and a co-stabilizer, the accelerator is a copolymer synthesized from vinyl chloride monomer and a polyester monomer; and a surface layer; wherein the middle layer is disposed between the surface layer and the bottom layer.

2. The plastic floor tile structure according to claim 1, characterized in that, the degree of polymerization of the polyvinyl chloride resin is 700 to 1000.

3. The plastic floor tile structure according to claim 1, characterized in that, based on 100 parts by weight of the polyvinyl chloride resin, the content of the calcium-zinc stabilizer is 3 to 10 parts by weight, and the content of the co-stabilizer is 1 to 5 parts by weight.

4. The plastic floor tile structure according to claim 1, characterized in that, the co-stabilizer is selected from the group consisting of epoxidized soybean oil, dibenzoylmethane, and stearoylbenzoylmethane.

5. The plastic floor tile structure according to claim 1, characterized in that, based on the total amount of the vinyl chloride monomer and the polyester monomer for synthesizing the accelerator being 100 weight percent, the content of the vinyl chloride monomer is 65 to 85 weight percent.

6. The plastic floor tile structure according to claim 1, characterized in that, the accelerator is modified with functional groups selected from the group consisting of vinyl, vinylidene chloride, vinyl acetate, vinyl versatate, and acrylate.

7. The plastic floor tile structure according to claim 1, characterized in that, the accelerator is modified with vinylidene chloride and vinyl versatate or the accelerator is modified with vinylidene chloride and acrylate.

8. The plastic floor tile structure according to claim 1, characterized in that, based on the total weight of the accelerator being 100 weight percent, the accelerator is modified with 10 to 15 weight percent of vinyl or vinylidene chloride.

9. The plastic floor tile structure according to claim 1, characterized in that, based on the total weight of the accelerator being 100 weight percent, the accelerator is modified with 5 to 15 weight percent of vinyl acetate, vinyl versatate, or acrylate.

10. The plastic floor tile structure according to claim 1, characterized in that, the lubricant composition comprises an internal lubricant and an external lubricant, and the weight ratio of the internal lubricant to the external lubricant is 3:7 to 7:

3.

11. The plastic floor tile structure according to claim 10, characterized in that, the internal lubricant is selected from the group consisting of fatty alcohols, fatty acid esters, and fatty acid amides.

12. The plastic floor tile structure according to claim 10, characterized in that, the external lubricant is selected from the group consisting of carboxylic acid ester wax, polyethylene wax, and oxidized polyethylene wax.

13. The plastic floor tile structure according to claim 1, characterized in that, the material of the bottom layer includes polyvinyl chloride, and the material of the surface layer includes polyvinyl chloride.

14. The plastic floor tile structure according to claim 1, characterized in that, the thickness of the bottom layer is 0.2 mm to 0.5 mm, the thickness of the intermediate layer is 0.05 mm to 0.15 mm, and the thickness of the surface layer is 2 mm to 7 mm.

15. A manufacturing method of a plastic floor tile structure, characterized in that, the manufacturing method includes: preparing a mixture, the mixture including: 100 parts by weight of polyvinyl chloride resin, 3 parts by weight to 10 parts by weight of plasticizer, 4 parts by weight to 15 parts by weight of heat stabilizer composition, 0.5 parts by weight to 3 parts by weight of accelerator, 1 part by weight to 5 parts by weight of toughening agent, 0.1 parts by weight to 0.5 parts by weight of lubricant composition, and 0.1 parts by weight to 1 part by weight of antioxidant; wherein, the heat stabilizer composition contains calcium zinc stabilizer and auxiliary stabilizer, and the accelerator is a copolymer synthesized from vinyl chloride monomer and polyol ester monomer; mixing the mixture at a temperature of 80°C to 120°C to form a dry powder; lowering the temperature of the dry powder to a temperature of 35°C to 50°C under a stirring state to obtain a resin composition; processing the resin composition to form an intermediate layer; and performing a lamination process to dispose the intermediate layer between the bottom layer and the surface layer to produce a plastic floor tile structure.

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