A kind of elastic floor tile and its preparation process

Abstract

The present invention relates to the field of elastic floor tiles, and is used to solve the problem that the existing elastic floor tiles are prone to frost spraying and oil return. A kind of elastic floor tile is provided, which includes, by weight: matrix components: 100-130 parts of TPU, 40-50 parts of silicone rubber; auxiliary agent: 20-30 parts of barium sulfate and 3-6 parts of white oil; the barium sulfate is distributed in the entity space and pore space of the elastic floor tile at the same time. The elastic floor tile provided by the present invention has a porous structure, and this porous structure has two functions, one is to increase the buffering performance of the floor tile, and the other is that the inner hole surface is much larger than the outer surface of the floor tile, so that the auxiliary agent or oil agent migrates more to the inner hole during the frost spraying and oil return, rather than the outer surface of the floor tile; the elastic floor tile provided by the present invention adds an excessive amount of barium sulfate, so that a part of the barium sulfate is separated out and enters the pore space of the elastic floor tile to fill the space gap, and while ensuring that the inner surface of the pore space is large enough, the pore space is filled by the precipitation of barium sulfate, which can reduce the deformation of the elastic floor tile when it is stressed.

Description

Technical Field

[0001] The invention relates to the field of elastic floor tiles, and in particular to an elastic floor tile and a preparation process thereof. Background Art

[0002] In water parks, swimming pools, hot springs, baths, SPAs and other water structures with high safety requirements, elastic floor tiles are often used instead of ceramic tiles. Elastic floor tiles have good resilience, which greatly improves comfort and safety. At present, elastic floor tiles are mostly made of rubber, but due to special application scenarios such as water parks or hot springs, there are also higher requirements for the performance of rubber materials, such as water resistance, anti-slip, wear resistance, high temperature resistance and corrosion resistance. At present, the modification of rubber is more often done by material compounding and adding additives.

[0003] There are still some difficulties in the existing rubber preparation, such as frosting, oil return or anti-sticking during use. Among them, the main reason for frosting is that the additives with low bonding degree with the rubber matrix gradually migrate to the surface and precipitate during use. How to reduce the occurrence of frosting is one of the technical problems that urgently need to be solved. Summary of the invention

[0004] The purpose of the present invention is to provide an elastic floor tile to solve the problem that the existing elastic floor tiles are prone to frost spraying and oil return.

[0005] The purpose of the present invention is also to provide a method for preparing elastic floor tiles, so that the floor tiles have good water resistance, resilience, temperature resistance, corrosion resistance, wear resistance, aging resistance and anti-slip properties, while avoiding the occurrence of frost and oil return, and increasing anti-warping properties.

[0006] The embodiments of the present invention are implemented by the following technical solutions:

[0007] A flexible floor tile, comprising, by weight:

[0008] Matrix composition: 100-130 parts TPU, 40-50 parts silicone rubber;

[0009] Additives: 20-30 parts of barium sulfate and 3-6 parts of white oil;

[0010] The barium sulfate is distributed in both the solid space and the pore space of the elastic floor tile.

[0011] Preferably, the auxiliary agent also includes: 10-15 parts of anti-slip agent.

[0012] Preferably, the anti-slip agent includes: wollastonite.

[0013] Preferably, the ratio of the solid space to the pore space of the elastic floor tile is 1:1 to 5:3.

[0014] Preferably, the auxiliary agent further comprises: 1.5-3 parts of an antioxidant, wherein the antioxidant comprises one or more of PNA, DMDS, DTPD and catechol.

[0015] A preparation process of the elastic floor tile comprises:

[0016] S1, after mixing TPU, silicone rubber and white oil, adding porogen, crosslinking agent and the auxiliary agent to obtain a mixture;

[0017] S2, pouring the mixture into a brick mold after dynamic vulcanization process, and obtaining a primary brick after solidification;

[0018] S3. Place the initial embryo in a -60℃~-25℃ environment for 2~4 days to obtain a cooled embryo, and finally obtain the elastic floor tile through a rewarming process.

[0019] Preferably, the porogen is 4,4 ， -oxybis(phenylsulfonyl)hydrazide, the porogen is 3-6 parts by weight.

[0020] Preferably, the reheating process includes: gradually heating the environment at a rate of 5-8°C / h until the temperature reaches 0-5°C, stopping the heating, and then storing the cooled embryo at room temperature. After the cooled embryo returns to room temperature, elastic floor tiles are obtained.

[0021] Preferably, the temperature of the vulcanization process is 200-230° C. and the vulcanization time is 20-40 min.

[0022] Preferably, the initial vulcanization temperature of the vulcanization process is 120-150° C., the vulcanization time is 10-15 minutes, and then the temperature is raised to 200-230° C., and the vulcanization time is 15-20 minutes.

[0023] The present invention has at least the following beneficial effects:

[0024] The elastic floor tile provided by the present invention has a porous structure, and the porous structure has two functions: one is to increase the buffering performance of the floor tile; the other is that the inner hole surface is much larger than the outer surface of the floor tile, so that during the spraying and oiling process, the additive or oil agent migrates more to the inner hole rather than the outer surface of the floor tile;

[0025] The elastic floor tiles provided by the present invention add an excess of barium sulfate, so that a part of the barium sulfate is precipitated into the pore space of the elastic floor tiles to fill the space gap. The reason for adopting this technical solution is to ensure that the paths of frost spraying and oil return are mostly to the pore space. The surface area of ​​the pore space should be much larger than the outer surface of the floor tiles. However, if the porosity is too high, the deformation of the floor tiles under the same pressure will be higher than that of the floor tiles with low porosity, and the resilience of the floor tile matrix will be higher. At the same time, under the long-term continuous action of external force, the reciprocating high deformation is also easy to cause the elastic floor tiles to warp. Therefore, the present invention can reduce the deformation of the elastic floor tiles when they are subjected to force by filling the pore space through the precipitation of barium sulfate while ensuring that the inner surface of the pore space is large enough;

[0026] Excessive barium sulfate makes the elastic floor tiles more acid and alkali resistant;

[0027] The preparation process provided by the present invention disperses silicone rubber in TPU through dynamic vulcanization, and since the rubber phase is cross-linked, the temperature resistance, elasticity and resistance to permanent deformation of the floor tile are improved; the auxiliary agent is allowed to precipitate into the pore space of the elastic floor tile in advance through the cooling operation, filling a part of the pore space, and at the same time, after rewarming, the elastic floor tile is prevented from frost spraying and oil return again. DETAILED DESCRIPTION

[0028] In order to make the purpose, method scheme and advantages of the embodiments of the present invention clearer, the method scheme in the embodiments of the present invention is clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] Elastic floor tiles are often used in bathrooms, water parks, hot springs and other scenes. Due to the humid, high temperature, or chloride ion-containing environment, elastic floor tiles need to have good water resistance, anti-slip, high temperature resistance and corrosion resistance. Therefore, in the selection and modification process of elastic floor tile materials, functional additives are inevitably used. However, in order to improve various properties, the amount of functional additives added is increased, and elastic floor tiles are prone to frost spraying and oil return during use. In order to reduce the occurrence of the above-mentioned phenomena while ensuring the performance of elastic floor tiles, the inventors conceived the scheme in the following embodiments.

[0030] Example 1

[0031] A flexible floor tile, comprising, by weight:

[0032] Matrix composition: 100-130 parts TPU, 40-50 parts silicone rubber;

[0033] Additives: 20-30 parts of barium sulfate and 3-6 parts of white oil;

[0034] The barium sulfate is distributed in both the solid space and the pore space of the elastic floor tile.

[0035] In the specific implementation process, the distribution of barium sulfate in the physical space of the elastic floor tiles refers to the dispersion and wrapping of barium sulfate in the matrix material of the elastic floor tiles. TPU has excellent comprehensive properties such as high elasticity, high strength, high toughness, wear resistance, oil resistance, water resistance, high and low temperature resistance, anti-slip and tear resistance, but the texture is not flexible and delicate enough. After the silicone rubber compound is used in this embodiment, the overall skin feel of the floor tiles is fully improved, making it more suitable for occasions that are in direct contact with human skin, such as bathrooms, water parks and hot springs. Barium sulfate can improve the corrosion resistance of floor tiles, increase the service life of elastic floor tiles, and broaden their use scenarios. In scenes such as water parks, swimming pools and hot springs, the water treatment agents used are often acidic or strongly oxidizing, such as trichloroisocyanuric acid or sodium hypochlorite.

[0036] In this embodiment, the pore space has two functions: one is to increase the buffering performance of the elastic floor tile; the other is to make the additive precipitate more into the pore space rather than the outer surface of the elastic floor tile from the aspects of surface proportion and cutting off the precipitation path. Assuming that the elastic floor tile has no voids, when the additive precipitates from the base material, it will migrate to the outer surface of the elastic floor tile, and the pore space provides an inner surface for precipitation, and also cuts off the path for the additive to precipitate from the inside to the outside, thereby reducing phenomena such as frost spraying and oil return. However, in order for the pores to accommodate the additives, the pore size will be relatively large, and from the increase in the deformation of the elastic floor tile when subjected to force, there are higher requirements for the resilience and anti-warping performance of the base material of the elastic floor tile. Therefore, this embodiment also utilizes the precipitation characteristics of the additive, so that barium sulfate precipitates in advance to occupy a part of the pore space, reducing the deformation of the elastic floor tile when subjected to force.

[0037] White oil has good fluidity and lubricity, which can effectively reduce the viscosity of rubber, improve fluidity and processability. At the same time, white oil can also reduce the friction between rubber and mold, making it easier to demold the rubber. In addition, it can also improve the flexibility and anti-aging properties of elastic floor tiles to a certain extent.

[0038] Example 2

[0039] In order to improve the anti-slip performance of the elastic floor tiles, an improvement was made on the basis of Example 1. In this example, the auxiliary agent further includes: 10-15 parts of an anti-slip agent, and the anti-slip agent includes: wollastonite.

[0040] During the specific implementation process, due to the addition of silicone rubber, the anti-skid performance of the elastic floor tiles is weakened, so an anti-skid agent is used in this embodiment. The anti-skid effect of wollastonite is mainly due to its fine particles and irregular shape. These particles can form a certain friction coefficient on the surface of the material, thereby providing good anti-skid performance for the surface of the material. Wollastonite has good dispersibility, high temperature stability and low thermal expansion coefficient, so that the elastic floor tiles can be used in a hot spring environment with a higher temperature, and the performance can also be maintained well. The anti-skid performance of the floor tiles can also be improved by making anti-skid patterns on the surface of the elastic floor tiles.

[0041] Example 3

[0042] In order to make the relationship between the precipitation of the additive and the deformation amount harmonious and unified, improvements were made on the basis of Example 1-2. In this example, the ratio of the solid space to the pore space of the elastic floor tile is 1:1 to 5:3.

[0043] In the specific implementation process, if the pore space is too small, it is not conducive to the precipitation of the additives. If the pore space is too large, the stress deformation of the elastic floor tile is too large, and more additives need to be precipitated to occupy the pore space, which increases the process time and process cost. In addition, when the amount of barium sulfate exceeds a certain amount, it is easy to agglomerate. In order to reduce the stress deformation of the elastic floor tile to a certain extent while satisfying the precipitation of the additives into the pore space, through multiple tests, it is concluded that the most suitable ratio of the solid space to the pore space of the elastic floor tile is between 1:1 and 5:3.

[0044] Example 4

[0045] In order to improve the antioxidant properties of elastic floor tiles, improvements were made on the basis of Example 3. In this embodiment, the auxiliary agent also includes: 1.5-3 parts of antioxidant, and the antioxidant includes one or more of N-phenyl-α-naphthylamine (PNA), dimethyl sulfide (DMDS), diisopropyl sulfide (DTPD) and catechol.

[0046] In the specific implementation process, since water parks, swimming pools and hot springs may be set up outdoors, the requirements for antioxidant performance are higher. Since most antioxidants are toxic, the amount used should not be too high.

[0047] Example 5

[0048] A preparation process of the elastic floor tile comprises:

[0049] S1, mixing TPU, silicone rubber and white oil in an internal mixer, and then adding a porogen, a crosslinking agent and the auxiliary agent to obtain a mixture;

[0050] S2, pouring the mixture into a brick mold after dynamic vulcanization process, and obtaining a primary brick after solidification;

[0051] S3. Place the initial embryo in a -60℃~-25℃ environment for 2~4 days to obtain a cooled embryo, and finally obtain the elastic floor tile through a rewarming process.

[0052] The porogen is 4,4 ， -oxybis(phenylsulfonyl)hydrazide, the porogen is 3-6 parts by weight.

[0053] During the specific implementation process, the cross-linking agent can be sulfur powder, TMTD and magnesium oxide, etc., and the vulcanization accelerators MBT, DM and DPG, etc. can also be used. This embodiment adopts a pre-low-temperature precipitation process so that the auxiliary agent enters the pore space before the elastic floor tile is formed. By controlling the type and amount of the porogen, the pore-forming result, that is, the porosity and pore size, can be controlled. By controlling the cooling time and cooling temperature, the precipitation degree of the auxiliary agent can be regulated while ensuring that the performance of the floor tile is not affected, thereby regulating its proportion in the pores, and finally regulating the force deformation of the elastic floor tile.

[0054] Example 6

[0055] In order to reduce the process cost while ensuring the performance of the elastic floor tiles, improvements were made on the basis of Example 5. In this embodiment, the reheating process includes: gradually heating the environment at a heating rate of 5-8°C / h until the temperature reaches 0-5°C, then stopping the heating, and then storing the cooled embryo at room temperature. After the cooled embryo returns to room temperature, the elastic floor tiles are obtained.

[0056] In the specific implementation process, the operation of cooling first and then reheating makes it more difficult for the additives that have not been precipitated during the cooling stage to precipitate after the elastic floor tiles are formed, further reducing the possibility of frost spraying and oil return. The reheating process ensures the performance and reheating efficiency of the elastic floor tiles by controlling the heating rate.

[0057] Through experiments, it is known that after the temperature is restored to 0-5℃, the structural performance of the elastic floor tiles has basically been finalized, so there is no need to continue the reheating operation, which reduces energy consumption and saves economic costs.

[0058] Example 7

[0059] In order to better precipitate barium sulfate, improvements were made based on Example 6. In this example, the temperature of the vulcanization process was 200-230° C. and the vulcanization time was 20-40 min.

[0060] In the specific implementation process, relatively speaking, small molecule additives or promoters are more likely to bloom, but since most of them are less environmentally friendly and their dosage is not easy to be too large, the technical solution of the present invention mainly uses barium sulfate as the precipitate, and barium sulfate has relatively good compatibility with the matrix material and is not easy to precipitate. In order to promote the precipitation process of barium sulfate, the present invention appropriately increases the vulcanization temperature, while ensuring the performance of the elastic floor tiles, destroys part of the cross-linked structure, reduces the compatibility between barium sulfate and the matrix, and promotes the precipitation of barium sulfate.

[0061] Example 8

[0062] In order to better precipitate barium sulfate, improvements were made on the basis of Example 6. In this embodiment, the initial vulcanization temperature of the vulcanization process is 120-150°C, the vulcanization time is 10-15min, and then the temperature is raised to 200-230°C, and the vulcanization time is 15-20min.

[0063] In the specific implementation process, a two-stage vulcanization process is adopted in this embodiment. The initial temperature is relatively low to ensure that the vulcanization process proceeds in an orderly manner to form a high-performance porous elastic floor tile. The temperature is increased during the secondary vulcanization to promote the barium sulfate to enter the formed porous structure. The setting of the staged process promotes the precipitation of barium sulfate while ensuring the excellent performance of the elastic floor tile as much as possible, while also reducing energy consumption and economic costs.

[0064] Test Example 1

[0065] A preparation process of the elastic floor tile comprises:

[0066] S1, 100 parts of TPU, 40 parts of silicone rubber, 3 parts of white oil were mixed in an internal mixer, and 3 parts of 4,4 ， -oxybisphenyl yellow hydrazide, 1.5 parts of sulfur, 1.5 parts of MBT, 20 parts of barium sulfate, 10 parts of wollastonite, and 1.5 parts of DTPD to obtain a mixture;

[0067] S2. Pour the mixture into a brick mold after dynamic vulcanization and obtain a primary brick after solidification; the temperature of the vulcanization process is 220° C. and the vulcanization time is 30 min.

[0068] S3. After placing the initial embryo in a -60°C environment for 3 days, a cooled embryo is obtained, and finally the elastic floor tile is obtained through a rewarming process.

[0069] The reheating process includes: gradually heating the environment at a heating rate of 8°C / h until the temperature reaches 0°C, stopping the heating, and then storing the cooled embryo at room temperature. After the cooled embryo returns to room temperature, the elastic floor tile is obtained.

[0070] Test Example 2

[0071] A preparation process of the elastic floor tile comprises:

[0072] S1, 100 parts of TPU, 40 parts of silicone rubber, 3 parts of white oil were mixed in an internal mixer, and 3 parts of 4,4 ， -oxybisphenyl yellow hydrazide, 1.5 parts of sulfur, 1.5 parts of MBT, 30 parts of barium sulfate, 10 parts of wollastonite, and 1.5 parts of DTPD to obtain a mixture;

[0073] S2. Pour the mixture into a brick mold after dynamic vulcanization and obtain a primary brick after solidification; the temperature of the vulcanization process is 220° C. and the vulcanization time is 30 min.

[0074] S3. After placing the initial embryo in a -60°C environment for 3 days, a cooled embryo is obtained, and finally the elastic floor tile is obtained through a rewarming process.

[0075] The reheating process includes: gradually heating the environment at a heating rate of 8°C / h until the temperature reaches 0°C, stopping the heating, and then storing the cooled embryo at room temperature. After the cooled embryo returns to room temperature, the elastic floor tile is obtained.

[0076] Test Example 3

[0077] A preparation process of the elastic floor tile comprises:

[0078] S1, 100 parts of TPU, 40 parts of silicone rubber, 3 parts of white oil were mixed in an internal mixer, and 3 parts of 4,4 ， -oxybisphenyl yellow hydrazide, 1.5 parts of sulfur, 1.5 parts of MBT, 25 parts of barium sulfate, 10 parts of wollastonite, and 1.5 parts of DTPD to obtain a mixture;

[0079] S2. Pour the mixture into a brick mold after dynamic vulcanization and obtain a primary brick after solidification; the temperature of the vulcanization process is 220° C. and the vulcanization time is 30 min.

[0080] S3. After placing the initial embryo in a -60°C environment for 3 days, a cooled embryo is obtained, and finally the elastic floor tile is obtained through a rewarming process.

[0081] The reheating process includes: gradually heating the environment at a heating rate of 8°C / h until the temperature reaches 0°C, stopping the heating, and then storing the cooled embryo at room temperature. After the cooled embryo returns to room temperature, the elastic floor tile is obtained.

[0082] Test Example 4

[0083] A preparation process of the elastic floor tile comprises:

[0084] S1, 100 parts of TPU, 40 parts of silicone rubber, 3 parts of white oil were mixed in an internal mixer, and 3 parts of 4,4 ，-oxybisphenyl yellow hydrazide, 1.5 parts of sulfur, 1.5 parts of MBT, 25 parts of barium sulfate, 10 parts of wollastonite, and 1.5 parts of DTPD to obtain a mixture;

[0085] S2. After the mixture is subjected to a dynamic vulcanization process, it is poured into a brick mold and cured to obtain a primary blank; the initial vulcanization temperature of the vulcanization process is 130° C., the vulcanization time is 12 min, and then the temperature is raised to 230° C., and the vulcanization time is 15 min.

[0086] S3. After placing the initial embryo in a -60°C environment for 3 days, a cooled embryo is obtained, and finally the elastic floor tile is obtained through a rewarming process.

[0087] Comparative Example 1

[0088] A preparation process of the elastic floor tile comprises:

[0089] S1, 100 parts of TPU, 40 parts of silicone rubber, 3 parts of white oil were mixed in an internal mixer, and 3 parts of 4,4 ， -oxybisphenyl yellow hydrazide, 1.5 parts of sulfur, 1.5 parts of MBT, 20 parts of barium sulfate, 10 parts of wollastonite, and 1.5 parts of DTPD to obtain a mixture;

[0090] S2. Pour the mixture into a brick mold after dynamic vulcanization, and obtain elastic floor tiles after curing; the temperature of the vulcanization process is 220° C. and the vulcanization time is 30 minutes.

[0091] Comparative Example 2

[0092] A preparation process of the elastic floor tile comprises:

[0093] S1, 100 parts of TPU, 40 parts of silicone rubber, 3 parts of white oil were mixed in an internal mixer, and 3 parts of 4,4 ， -oxybisphenyl yellow hydrazide, 1.5 parts of sulfur, 1.5 parts of MBT, 20 parts of barium sulfate, 10 parts of wollastonite, and 1.5 parts of DTPD to obtain a mixture;

[0094] S2. Pour the mixture into a brick mold after dynamic vulcanization and obtain a primary brick after solidification; the temperature of the vulcanization process is 220° C. and the vulcanization time is 30 min.

[0095] S3. After placing the initial embryo in a -60°C environment for 3 days, a cooled embryo is obtained, and after reheating in a room temperature environment, an elastic floor tile is obtained.

[0096] Comparative Example 3

[0097] A preparation process of the elastic floor tile comprises:

[0098] S1, 100 parts of TPU, 40 parts of silicone rubber, 3 parts of white oil were mixed in an internal mixer, and 3 parts of 4,4 ， -oxybisphenyl yellow hydrazide, 1.5 parts of sulfur, 1.5 parts of MBT, 20 parts of barium sulfate, 10 parts of wollastonite, and 1.5 parts of DTPD to obtain a mixture;

[0099] S2. Pour the mixture into a brick mold after dynamic vulcanization and obtain a primary brick after solidification; the temperature of the vulcanization process is 150° C. and the vulcanization time is 30 min.

[0100] S3. After placing the initial embryo in a -60°C environment for 3 days, a cooled embryo is obtained, and finally the elastic floor tile is obtained through a rewarming process.

[0101] The reheating process includes: gradually heating the environment at a heating rate of 8°C / h until the temperature reaches 0°C, stopping the heating, and then storing the cooled embryo at room temperature. After the cooled embryo returns to room temperature, the elastic floor tile is obtained.

[0102] Comparative Example 4

[0103] A preparation process of the elastic floor tile comprises:

[0104] S1. After mixing 100 parts of TPU, 40 parts of silicone rubber and 3 parts of white oil in an internal mixer, 1.5 parts of sulfur, 1.5 parts of MBT, 20 parts of barium sulfate, 10 parts of wollastonite and 1.5 parts of DTPD were added to obtain a mixture;

[0105] S2. Pour the mixture into a brick mold after dynamic vulcanization and obtain a primary brick after solidification; the temperature of the vulcanization process is 220° C. and the vulcanization time is 30 min.

[0106] S3. After placing the initial embryo in a -60°C environment for 3 days, a cooled embryo is obtained, and finally the elastic floor tile is obtained through a rewarming process.

[0107] The reheating process includes: gradually heating the environment at a heating rate of 8°C / h until the temperature reaches 0°C, stopping the heating, and then storing the cooled embryo at room temperature. After the cooled embryo returns to room temperature, the elastic floor tile is obtained.

[0108] experiment

[0109] (a) The elastic floor tiles prepared according to the process of Test Examples 1-4 and Comparative Examples 1-3 were subjected to an anti-warping test in the following manner:

[0110] A load of 100 kg is applied to the upper surface of the elastic floor tile, and the load is applied 50 times per minute, so that the elastic floor tile vibrates continuously, and the application time is 2 days. After the load is removed, the warpage of the elastic tile is tested using a warpage tester. The warpage calculation method is: after the elastic tile is reversely buckled on the plane, the maximum distance between its bottom and the plane is D, the length of the elastic tile is L, and the warpage n = D / L*100%. The test results are shown in Table 1:

[0111] Table 1

[0112] Test Example 1 Test Example 2 Test Example 3 Test Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 warpage 0.24％ 0.27％ 0.21％ 0.26％ 7.17％ 2.13％ 5.76％

[0113] It can be seen from Table 1 that the elastic floor tiles prepared according to the preparation process provided by the present invention have good anti-warping performance.

[0114] From the comparison between Comparative Example 1 and Test Example 1, it can be seen that the cooling and precipitation operation of the additive greatly improves the anti-warping performance of the elastic floor tiles.

[0115] From the comparison between Comparative Example 2 and Test Example 1, it can be seen that appropriate rewarming operation helps the elastic floor tiles maintain their original excellent performance.

[0116] From the comparison between Comparative Example 3 and Test Example 1, it can be seen that appropriately increasing the vulcanization temperature is conducive to the precipitation of the additive, thereby better filling the pore space and improving the anti-warping performance.

[0117] (b) The elastic floor tiles prepared according to the process of Test Examples 1-4 and Comparative Examples 1-3 were tested for fixed extension resilience, the method is as follows:

[0118] The floor tile sample is installed on the test frame, and a compressor is installed above the sample. During the test, the compressor is dropped onto the sample, and a pressure of 1500N is applied. Then the compression height is recorded within 30 seconds. After 5S of the compression, the rebound height of the sample is recorded, and the sample rebound rate is calculated = rebound height ÷ compression height × 100%. The test results are shown in Table 2.

[0119] Table 2

[0120] Test Example 1 Test Example 2 Test Example 3 Test Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Rebound rate 98.7 97.4 99.0 98.2 89.7％ 73.1％ 85.4％

[0121] It can be seen from Test Examples 1-4 that the elastic floor tiles prepared by the preparation process provided by the present invention have excellent rebound performance.

[0122] From the comparison between Comparative Example 1 and Test Example 1, it can be seen that when the low-temperature precipitation process is not performed, the rebound performance is reduced to a certain extent due to the excessive pore space.

[0123] From the comparison between Comparative Example 2 and Test Example 1, it can be seen that the rewarming operation adopted by the present invention can greatly avoid the loss of performance of the elastic floor tiles.

[0124] From the comparison between comparative example 3 and test example 1, it can be seen that the increase of the vulcanization temperature promotes the auxiliary agent to fill the pore space, and the rebound performance of the elastic floor tile is better. The main reason is that under the same pressure, the deformation amount is reduced.

[0125] (c) The elastic floor tiles prepared according to the process of Test Examples 1-4 and Comparative Examples 1-4 were subjected to anti-slip test, the method is as follows:

[0126] Place the sample on the test platform of PCF-03 friction coefficient tester (Shandong Puchuang Industrial Technology Co., Ltd.), ensuring that the elastic floor tile is in full contact with the platform surface; turn on the instrument, and make the moving part of the friction coefficient tester slide on the sample surface. The instrument records the friction coefficient synchronously. The test results are shown in Table 3:

[0127] Table 3

[0128] Test Example 1 Test Example 2 Test Example 3 Test Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 0.78 0.81 0.79 0.85 0.80 0.74 0.83 0.80

[0129] It can be seen from Table 3 that the elastic floor tiles prepared by using the matrix composition, anti-slip agent and process flow provided by the present invention have excellent anti-slip performance.

[0130] (d) The elastic floor tiles prepared according to the process of Test Examples 1-4 and Comparative Examples 1-4 were subjected to a frost spray test in the following manner:

[0131] After placing the sample in the XK-8070 rubber ozone aging test chamber (Kunshan Xiangke Testing Instrument Co., Ltd.), the experimental parameters were set, and the ozone concentration (volume fraction) was 100×10 -8 ; Temperature in the box: 50℃; Gas displacement flow rate: 15mm / s; Test time: 6h. After the test, take out the sample and judge the frost spraying condition of the sample after 10min. The test results are divided into 4 levels.

[0132] Grade A: No frost, no frost is visible on the surface of the sample;

[0133] Grade B: Slight blooming, the color of the sample surface is obviously reduced, and a thin layer of frost appears;

[0134] Grade C: Moderate frost, with an obvious frost layer on the surface of the specimen;

[0135] Grade D: Severe frosting, with accumulated frost on the surface of the specimen.

[0136] The test results are shown in Table 4:

[0137] Table 4

[0138] Test Example 1 Test Example 2 Test Example 3 Test Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 A A A A B A B D

[0139] It can be seen from Test Examples 1-4 that the elastic floor tiles prepared by the preparation process provided by the present invention have anti-frost properties.

[0140] From the comparison between Comparative Example 1 and Test Example 1, it can be seen that when the low-temperature precipitation process is not performed, the anti-frost performance of the elastic floor tiles is reduced.

[0141] From the comparison between Comparative Example 3 and Test Example 1, it can be seen that the increase in vulcanization temperature promotes the precipitation of additives. The pre-precipitation amount of additives in Comparative Example 3 is limited, resulting in excessive additives remaining in the matrix, thereby causing the anti-flosing performance of the elastic floor tiles to decrease.

[0142] From the comparison between Comparative Example 4 and Test Example 1, it can be seen that the addition of the porogen greatly improves the anti-frost performance of the elastic floor tiles.

[0143] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A process for preparing elastic floor tiles, characterized in that: include: S1. After kneading 100-130 parts of TPU, 40-50 parts of silicone rubber and 3-6 parts of white oil, a porogen, a crosslinking agent and an auxiliary agent are added to obtain a mixture; the auxiliary agent includes 20-30 parts of barium sulfate; S2, pouring the mixture into a brick mold after dynamic vulcanization process, and obtaining a primary brick after solidification; S3, placing the initial embryo in an environment of -60℃~-25℃ for 2~4 days to obtain a cooled embryo, and finally obtaining an elastic floor tile through a rewarming process; The reheating process includes: gradually raising the temperature of the environment at a rate of 5-8°C / h until the temperature reaches 0-5°C, stopping the heating, and then storing the cooling embryo at room temperature. After the cooling embryo returns to room temperature, the elastic floor tile is obtained; The temperature of the vulcanization process is 200-230°C and the vulcanization time is 20-40min; The barium sulfate is distributed in both the solid space and the pore space of the elastic floor tile.

2. The preparation process according to claim 1, characterized in that: The auxiliary agent also includes: 10-15 parts of anti-slip agent.

3. The preparation process according to claim 2, characterized in that: The anti-slip agent includes wollastonite.

4. The preparation process according to any one of claims 1 to 3, characterized in that: The ratio of solid space to pore space of elastic floor tiles is 1:1~5:

3.

5. The preparation process according to claim 4, characterized in that: The auxiliary agent also includes: 1.5-3 parts of antioxidant, and the antioxidant includes one or more of PNA, DMDS, DTPD and catechol.

6. The preparation process according to claim 4, characterized in that: The porogen is 4,4 ， -oxybis(phenylsulfonyl)hydrazide, the porogen is 3-6 parts by weight.