Prefabricated pressure-resistant stretch-proof polyurethane plastic floor material and preparation method thereof

Abstract

The invention discloses a prefabricated pressure-resistant and stretch-proof polyurethane plastic floor material and a preparation method thereof. On one hand, the invention provides the prefabricated pressure-resistant and stretch-proof polyurethane plastic floor material, and the main body of the floor material comprises the following raw materials: a component A, a component B and toughening fibers; the component A is prepared from the following components in parts by mass: 40 to 60 parts of epoxidized soybean oil modified polyol, 10 to 20 parts of polyester polyol and 2 to 8 parts of silicon-based defoaming agent; the component B is a curing agent, and the curing agent is an aliphatic polyisocyanate curing agent; acrylic acid grafted polypropylene fibers are selected as the toughening fibers. The invention further provides a preparation method of the prefabricated pressure-resistant and stretch-proof polyurethane plastic floor material. The material is relatively convenient to prepare, has relatively excellent pressure resistance and tensile property after being molded and cured, is not easy to crack after being rolled by a vehicle for a long time, and is relatively low in cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building materials, in particular to a prefabricated pressure and tensile resistant polyurethane plastic flooring material and a preparation method thereof. BACKGROUND

[0002] Flooring material refers to a special material laid on the ground and capable of presenting certain decorative and functional properties, and having good durability and mechanical properties. It is mainly used in the construction of underground garages, sports venues, squares and parks of building areas. According to the material quality, the existing flooring materials mainly include epoxy self-leveling flooring, diamond abrasive wear-resistant flooring, epoxy terrazzo flooring, cement-based terrazzo, epoxy colored sand flooring, epoxy anti-static flooring, epoxy anti-skid flooring, polyurea corrosion-resistant flooring, polyurethane flooring, silicon PU flooring, and concrete sealing curing agent flooring, etc.

[0003] Polyurethane flooring material is a new type of solvent-free and pollution-free ground functional construction material used for flooring construction, which uses specific polyurethane material as the main laying material. It is especially suitable for the flooring coating construction of various industrial and mining enterprises, parking lots, sports fields and other places with anti-skid, anti-corrosion and wear-resistant requirements. The existing polyurethane flooring material is mainly a coating material, which is coated on the surface of the ground base layer by spraying or rolling during use, and forms a flooring material layer after curing. This type of coating material has relatively complicated construction operation and relatively high requirements for construction technology, and has poor workability. The prefabricated polyurethane flooring material is another type of polyurethane flooring material, which is in the form of a roll and belongs to a prefabricated roll. This type of flooring material is extremely convenient to construct. After spraying the adhesive paint on the surface of the ground base layer, it can be directly laid and then rolled and bonded to complete the construction. It has good workability and high construction efficiency.

[0004] The existing prefabricated polyurethane flooring material has excellent wear resistance, slip resistance and other properties, and good durability, but still has some deficiencies. The existing prefabricated polyurethane flooring material has certain deficiencies in pressure resistance and tensile resistance, and is prone to cracking after long-term resistance to vehicle rolling when used for laying in underground parking lots and other facilities. SUMMARY

[0005] In order to solve at least one of the above technical problems, a prefabricated polyurethane flooring material is developed, which is relatively convenient to prepare, has excellent pressure resistance and tensile resistance after material forming and curing, is not prone to cracking after long-term resistance to vehicle rolling, and has relatively low cost. The present application provides a preparation method of alkoxy branched silicone oil.

[0006] In one aspect, the application provides a prefabricated pressure-resistant and stretch-resistant polyurethane plastic floor material, the raw materials of the floor material body comprising A component, B component and toughening fiber; the mass fraction of each component of the A component is as follows: 40-60 parts of epoxy soybean oil modified polyol, 10-20 parts of polyester polyol, and 2-8 parts of silicon-based defoaming agent; the B component is a curing agent, and the curing agent is an aliphatic polyisocyanate curing agent; the toughening fiber is selected from acrylic acid grafted polypropylene fiber; the mass ratio of the A component to the B component is 6-8:1, and the mass ratio of the A component to the acrylic acid grafted polypropylene fiber is 8-14:1.

[0007] Optionally, the A component further comprises micro-silicon powder, and the addition amount of the micro-silicon powder is 6-12 parts.

[0008] Optionally, the polyester polyol is selected from one or more of polybutylene adipate glycol, polyhexylene adipate glycol, polycaprolactone glycol and / or polycarbonate glycol.

[0009] Optionally, the aliphatic polyisocyanate curing agent is selected from a hexamethylene diisocyanate-based polyisocyanate curing agent.

[0010] Optionally, the preparation method of the acrylic acid grafted polypropylene fiber comprises the following steps: Sa, irradiation treatment of polypropylene fiber at a radiation rate of 100 Gy / min under Co 60 ray for 6-6.5 h to obtain irradiated fiber, which is refrigerated for standby use; Sb, configuration of a grafting solution with sulfuric acid, ferrous sulfate, acrylic acid and water, the concentration of sulfuric acid in the grafting solution being 0.2-0.25 mol / L, the concentration of ferrous sulfate being 0.002-0.004 mol / L, and the mass fraction of acrylic acid being 18-24%; Sc, under nitrogen protection, the irradiated fiber obtained in step Sa is added to the grafting solution of step Sb, and reacted at 65-70°C for more than 4 h, the fiber is filtered out, washed with hot water at 85-90°C for more than 3 times, and vacuum dried to constant weight to obtain acrylic acid grafted polypropylene fiber.

[0011] Optionally, the thickness of the floor material is 8-20 mm.

[0012] Optionally, the A component further comprises pigments, the pigments are selected from inorganic pigments, and the addition amount of the pigments is 4-10 parts.

[0013] Optionally, the silicon-based defoaming agent is a polysiloxane defoaming agent.

[0014] Optionally, the prefabricated pressure-resistant and stretch-resistant polyurethane plastic floor material further comprises a waterproof paint layer coated on the surface of the floor material body.

[0015] In another aspect, the application provides a preparation method of the prefabricated pressure-resistant and stretch-resistant polyurethane plastic floor material as described above, comprising the following steps: S1, accurately weighing each component of the A component according to the formula amount, then fully stirring and mixing, and obtaining the A component after standing and defoaming; S2, fully stirring and mixing the A component obtained in step S1 with the B component according to a mass ratio of 6-8:1, and obtaining a mixed glue solution; S3, adding acrylic acid grafted polypropylene fibers to the mixed glue solution obtained in step S2 according to a mass ratio of the A component to the acrylic acid grafted polypropylene fibers of 8-14:1, fully stirring and mixing, and obtaining a prepolymer solution; S4, after casting and forming the prepolymer solution obtained in step S3 according to the required size, curing at room temperature, and obtaining the prefabricated pressure-resistant and stretch-resistant polyurethane plastic floor material.

[0016] In summary, the application has at least one of the following beneficial technical effects: 1. The application uses epoxy soybean oil modified polyol and polyester polyol as the main raw material, and a specific aliphatic polyisocyanate curing agent as the crosslinking curing agent to prepare a prefabricated polyurethane floor coiled material with specific material quality, which has excellent elasticity and toughness, excellent pressure resistance, and excellent tensile resistance.

[0017] 2. The prefabricated polyurethane floor material of the application also adds a certain amount of acrylic acid grafted polypropylene fibers, the grafted acrylic acid groups can form a high density of crosslinking with the epoxy groups in the system, which can further improve the tear resistance and tensile resistance of the floor material, and can effectively improve the service life of the floor material when resisting vehicle rolling for a long time.

[0018] 3. The preparation method of the application has simple preparation process, easy operation, and raw materials are easy to obtain, and the cost is relatively low. DETAILED DESCRIPTION

[0019] The application will be further described in detail below in combination with embodiments.

[0020] The application provides a prefabricated pressure-resistant and stretch-resistant polyurethane plastic floor material, the raw materials of the main body of the floor material include an A component, a B component and a toughening fiber; the mass fraction ratio of each component of the A component includes: 40-60 parts of epoxy soybean oil modified polyol, 10-20 parts of polyester polyol and 2-8 parts of silicon-based defoaming agent; the B component is a curing agent, and the curing agent adopts an aliphatic polyisocyanate curing agent; the toughening fiber selects acrylic acid grafted polypropylene fiber; the mass ratio of the A component to the B component is 6-8:1, and the mass ratio of the A component to the acrylic acid grafted polypropylene fiber is 8-14:1.

[0021] The preparation method of the above-mentioned prefabricated pressure-resistant and stretch-resistant polyurethane plastic floor material of the present application comprises the following steps: S1, accurately weighing each component of the A component according to the formula amount, then fully stirring and mixing, and obtaining the A component after standing and defoaming; S2, fully stirring and mixing the A component obtained in step S1 with the B component according to a mass ratio of 6-8:1, to obtain a mixed glue solution; S3, adding acrylic acid grafted polypropylene fibers to the mixed glue solution obtained in step S2 according to a mass ratio of the A component to the acrylic acid grafted polypropylene fibers of 8-14:1, fully stirring and mixing, to obtain a prepolymer solution; S4, after casting molding the prepolymer solution obtained in step S3 according to the required size, curing at room temperature, to obtain the prefabricated pressure-resistant and stretch-resistant polyurethane plastic floor material.

[0022] Before the present application, there are relatively few prefabricated polyurethane floor coiled materials in the prior art, and most of the polyurethane floor materials on the market are coating type materials. The existing prefabricated polyurethane floor coiled materials on the market are mostly prepared by reacting and curing polyester polyol or modified polyester polyol with isocyanate curing agent, and adding certain fillers and additives. The modified polyester polyol mostly selects a modified polyester polyol grafted with a modified group that can improve the compatibility of the system and increase the crosslinking degree of the system. This kind of prefabricated polyurethane floor material has certain strength, surface hardness and toughness, but the performance of the material itself in resisting high pressure is insufficient, and long-term vehicle rolling can easily cause the rupture of the crosslinked network of the material, thereby causing cracking and other problems.

[0023] To solve the above-mentioned deficiencies in the prior art, the applicant uses epoxy soybean oil modified polyol and polyester polyol as the main raw materials, uses aliphatic polyisocyanate curing agent as the crosslinking curing agent, and adds part of fillers and additives, and designs the scheme of the present application. The prefabricated polyurethane floor material prepared by the present application can not only effectively increase the crosslinking degree, but also form a high crosslinking density polyurethane crosslinked material network based on the uniform distribution of polyurethane elastomer in the material, and after being reinforced by fibers, it has excellent pressure resistance and stretch resistance.

[0024] The following are examples of the present application.

[0025] The main raw materials selected in the examples of the present application are all from the market.

[0026] Epoxy soybean oil modified polyol, model Nourypol 200, purchased from Shanghai Xiaoyan Technology Co., Ltd.; polyester polyol, polycarbonate diol, purchased from Wenzhou Kemao Biological Technology Co., Ltd.; polypropylene fiber, diameter 40-60 μm, length 4-6 mm, purchased from Taian Hongfa New Material Co., Ltd.; silicon-based defoaming agent, polysiloxane defoaming agent, model LT-7, purchased from Wenzhou Longtai Chemical Co., Ltd.; aliphatic polyisocyanate curing agent, model HT-100, purchased from Wanhua Chemical Group Co., Ltd.; microsilica, particle size 10-15 μm, purchased from Jinan Chuanze New Material Co., Ltd.

[0027] The application embodiment is prepared by using the following preparation method, including the following steps: S1, accurately weighing each component of the A component according to the formula amount, and then stirring and mixing at 800 rpm for 30 min, and obtaining the A component after standing and defoaming; S2, mixing the A component obtained in step S1 with the B component according to a mass ratio of 8:1 at a stirring speed of 250 rpm for 15 min, and obtaining a mixed glue solution; S3, adding acrylic acid grafted polypropylene fiber to the mixed glue solution obtained in step S2 according to the ratio, stirring and mixing at 800 rpm for 30 min, and obtaining a prepolymer solution; S4, after casting into a desired size according to the prepolymer solution obtained in step S3, curing at room temperature, and cutting according to the size, a prefabricated pressure and tensile resistant polyurethane plastic floor material with a coiled material thickness of 15 mm is prepared.

[0028] The acrylic acid grafted polypropylene fiber used in the application embodiments 1-8 is prepared by using the following steps: Sa, irradiating the polypropylene fiber at a radiation rate of 100 Gy / min under Co 60 ray for 6 h to obtain irradiated fiber, which is refrigerated for standby; Sb, preparing a grafting solution by using sulfuric acid, ferrous sulfate, acrylic acid and water, the concentration of sulfuric acid in the grafting solution is 0.2 mol / L, the concentration of ferrous sulfate is 0.002 mol / L, and the mass fraction of acrylic acid is 18%; Sc, under the protection of nitrogen, adding the irradiated fiber obtained in step Sa to the grafting solution of step Sb, and reacting at 65℃ for 4 h, filtering out the fiber, washing with 90℃ hot water for 3 times, and vacuum drying to constant weight to prepare the acrylic acid grafted polypropylene fiber. Example 1

[0029] The prefabricated pressure-resistant and tensile-resistant polyurethane plastic flooring material of this embodiment includes component A and component B as the main raw materials of the flooring material. The mass proportions of each component of component A include: 40 parts of epoxidized soybean oil modified polyol, 10 parts of polyester polyol, and 2 parts of silicone-based defoamer. Component B is a curing agent, and the curing agent used is HT-100 curing agent.

[0030] Acrylic grafted polypropylene fiber was added at a mass ratio of 14:1 between component A and acrylic grafted polypropylene fiber. Example 2

[0031] The prefabricated pressure-resistant and tensile-resistant polyurethane plastic flooring material of this embodiment includes component A and component B as the main raw materials of the flooring material; the mass ratio of each component of component A includes: 60 parts of epoxidized soybean oil modified polyol, 20 parts of polyester polyol, and 8 parts of silicone-based defoamer; component B is a curing agent, and the curing agent used is HT-100 curing agent.

[0032] Acrylic grafted polypropylene fiber was added at a mass ratio of 14:1 between component A and acrylic grafted polypropylene fiber. Example 3

[0033] The prefabricated pressure-resistant and tensile-resistant polyurethane plastic flooring material of this embodiment includes component A and component B as the main raw materials of the flooring material. The mass proportions of each component of component A include: 45 parts of epoxidized soybean oil modified polyol, 14 parts of polyester polyol, and 4 parts of silicone-based defoamer. Component B is a curing agent, and the curing agent used is HT-100 curing agent.

[0034] Acrylic grafted polypropylene fiber was added at a mass ratio of 14:1 between component A and acrylic grafted polypropylene fiber. Example 4

[0035] The prefabricated pressure-resistant and tensile-resistant polyurethane plastic flooring material of this embodiment includes component A and component B as the main raw materials of the flooring material; the mass proportions of each component of component A include: 55 parts of epoxidized soybean oil modified polyol, 18 parts of polyester polyol, and 6 parts of silicone-based defoamer; component B is a curing agent, and the curing agent used is HT-100 curing agent.

[0036] Acrylic grafted polypropylene fiber was added at a mass ratio of 14:1 between component A and acrylic grafted polypropylene fiber. Example 5

[0037] The prefabricated pressure-resistant and stretch-resistant polyurethane plastic floor material of the embodiment, raw materials of a main body of the floor material include A component and B component; the mass fraction ratio of each component of the A component includes 52 parts of epoxy soybean oil modified polyol, 16 parts of polyester polyol, and 5 parts of silicon-based defoaming agent; the B component is a curing agent, and the curing agent adopts HT-100 curing agent.

[0038] The acrylic acid grafted polypropylene fiber is added according to the mass ratio of the A component to the acrylic acid grafted polypropylene fiber of 14:1. Example 6

[0039] The prefabricated pressure-resistant and stretch-resistant polyurethane plastic floor material of the embodiment, raw materials of a main body of the floor material include A component and B component; the mass fraction ratio of each component of the A component includes 52 parts of epoxy soybean oil modified polyol, 16 parts of polyester polyol, and 5 parts of silicon-based defoaming agent; the B component is a curing agent, and the curing agent adopts HT-100 curing agent.

[0040] The acrylic acid grafted polypropylene fiber is added according to the mass ratio of the A component to the acrylic acid grafted polypropylene fiber of 14:1. Example 7

[0041] The prefabricated pressure-resistant and stretch-resistant polyurethane plastic floor material of the embodiment, raw materials of a main body of the floor material include A component and B component; the mass fraction ratio of each component of the A component includes 52 parts of epoxy soybean oil modified polyol, 16 parts of polyester polyol, and 5 parts of silicon-based defoaming agent; the B component is a curing agent, and the curing agent adopts HT-100 curing agent.

[0042] The acrylic acid grafted polypropylene fiber is added according to the mass ratio of the A component to the acrylic acid grafted polypropylene fiber of 14:1. Example 8

[0043] The prefabricated pressure-resistant and stretch-resistant polyurethane plastic floor material of the embodiment, raw materials of a main body of the floor material include A component and B component; the mass fraction ratio of each component of the A component includes 52 parts of epoxy soybean oil modified polyol, 16 parts of polyester polyol, and 5 parts of silicon-based defoaming agent; the B component is a curing agent, and the curing agent adopts HT-100 curing agent.

[0044] The acrylic acid grafted polypropylene fiber is added according to the mass ratio of the A component to the acrylic acid grafted polypropylene fiber of 14:1.

[0045] Comparative Example 1 The embodiment 1 of the Chinese invention patent with the publication number CN118725720A is taken as the comparative example 1 of the present application, and the thickness is also 15mm.

[0046] Comparative Example 2 The difference between this comparative example and Example 8 is that the epoxy soybean oil modified polyol is replaced with an equal amount of Savemol polyol modified polyol produced by BASF.

[0047] Comparative Example 3 The difference between this comparative example and Example 8 is that the epoxy soybean oil modified polyol is replaced with an equal amount of polyester polyol used in the examples of the present application.

[0048] Comparative Example 4 The difference between this comparative example and Example 8 is that the acrylic grafted polypropylene fiber is replaced with an equal amount of polypropylene fiber.

[0049] Comparative Example 5 The difference between this comparative example and Example 8 is that the acrylic grafted polypropylene fiber is replaced with an equal amount of microsilica powder.

[0050] Comparative Example 6 The difference between this comparative example and Example 8 is that the polyester polyol is replaced with an equal amount of polyether polyol with trade name C2004 purchased from Wanhua Chemical Group Co., Ltd.

[0051] Comparative Example 7 The difference between this comparative example and Example 8 is that 85% of the polyester polyol is replaced with polyether polyol with trade name C2004 purchased from Wanhua Chemical Group Co., Ltd.

[0052] Comparative Example 8 The difference between this comparative example and Example 8 is that the HT-100 curing agent is replaced with an equal amount of Hongkong HK triisocyanate curing agent.

[0053] The compressive strength, surface hardness and tensile strength of the products of Examples 1-8 and Comparative Examples 1-8 were detected.

[0054] The compressive strength of the floor material was detected according to the method described in JC / T 984-2005 “Polymer Cement Waterproof Mortar”, wherein the compressive strength was detected. The surface hardness was detected using a Shore hardness tester to detect the surface Shore hardness. The tensile strength and elongation at break of the floor material were detected according to the method described in GB / T 23445-2009 “Polymer Cement Waterproof Coating”.

[0055] The results are shown in Table 1 below.

[0056] Table 1 Detection Results of Examples 1-8 and Comparative Examples 1-8 Compressive strength (MPa) Surface Shore hardness Tensile strength (MPa) Elongation at break (%) Example 1 74 81.4 41 131 Example 2 76 81.1 40 130 Example 3 80 81.7 43 133 Example 4 79 81.5 44 132 Example 5 82 81.8 46 135 Example 6 84 82.1 49 133 Example 7 85 82.4 48 132 Example 8 84 82.5 50 132 Comparative Example 1 58 81.2 27 122 Comparative Example 2 48 74.2 25 126 Comparative Example 3 51 78.4 28 120 Comparative Example 4 58 82.4 34 128 Comparative Example 5 44 80.6 21 117 Comparative Example 6 51 79.8 30 128 Comparative Example 7 53 80.5 31 125 Comparative Example 8 39 75.9 25 133 As can be seen from the data in Table 1, the polyurethane floor materials prepared in Examples 1-8 of the present application have obvious improvements in compression strength and tensile strength compared with Comparative Example 1, and the surface hardness is at a similar level. It can be seen that the compression resistance and tensile resistance of the prefabricated polyurethane floor material of the present application are obviously superior to those of the existing similar materials.

[0057] As can be seen from the data comparison of Examples 1-8 of the present application in Table 1, the performance of the floor material can be further improved after the optimization of the ratio in the present application.

[0058] As can be seen from the data comparison of Example 8 and Comparative Examples 2-6 in Table 1, the compression resistance and tensile resistance of the floor material are obviously decreased after the use of other plant polyols or other polyols to replace the epoxy soybean oil modified polyol of the present application; the compression resistance is obviously decreased and the tensile resistance is more obviously decreased after the use of the present application without fiber reinforcement; in addition, the performance of the floor material is also obviously decreased after the use of other types of isocyanate curing agents or the use of polyether polyols to partially or completely replace the polyester polyol of the present application. It can be seen that the polyurethane material layer system formed by the specific ratio of the present application, the polyurethane elastomer and the high cross-linking density polyurethane cross-linking network, supplemented by filler reinforcement, and the good compatibility of the filler and the polyurethane system and the relatively uniform distribution of the filler, the performance of the material is very excellent; the use of acrylic acid grafted polypropylene fiber for fiber reinforcement on the basis of the above system can further obviously improve the compression resistance and tensile resistance of the material. The use of a single means for reinforcement or the use of other material systems will obviously damage the performance of the entire material system.

[0059] The applicant has carried out further experimental research on the floor material of the present application, and after coating the surface of the floor material with a water-based polyacrylate waterproof coating according to Examples 1-8 of the present application, the surface waterproof performance of the floor material can be further improved, which is more conducive to the cleaning of the surface. In addition, the performance of the floor material of the present application can be further improved by more than 2.5% based on the performance of the present application when the A component and the B component are mixed at a mass ratio of 6:1; and the performance of the floor material will obviously decrease when the A component and the B component are mixed at a mass ratio of less than or more than 6-8:1.

[0060] The applicant has carried out specific research on the fiber reinforcement of the present application, and has carried out detailed research on the influence of fibers with different grafting rates and different fiber addition amounts on the performance of the system. The following is Examples 9-16 of the present application, which are based on Example 8, and the difference lies in the preparation and addition amount of the fiber. Example 9

[0061] The acrylic acid grafted polypropylene fiber of the embodiment is prepared by the following steps: Sa, irradiate the polypropylene fiber under Co 60 ray at a radiation rate of 100 Gy / min for 6.25 h to obtain irradiated fiber, which is refrigerated for standby; Sb, prepare a grafting solution by using sulfuric acid, ferrous sulfate, acrylic acid and water, wherein the concentration of sulfuric acid in the grafting solution is 0.2 mol / L, the concentration of ferrous sulfate is 0.002 mol / L, and the mass fraction of acrylic acid is 18%; Sc, under nitrogen protection, add the irradiated fiber obtained in step Sa into the grafting solution of step Sb, and react at 65℃ for 4 h, filter out the fiber, wash it with hot water at 90℃ for 3 times, and vacuum dry to constant weight to obtain the acrylic acid grafted polypropylene fiber. Example 10

[0062] The acrylic acid grafted polypropylene fiber of the embodiment is prepared by the following steps: Sa, irradiate the polypropylene fiber under Co 60 ray at a radiation rate of 100 Gy / min for 6.5 h to obtain irradiated fiber, which is refrigerated for standby; Sb, prepare a grafting solution by using sulfuric acid, ferrous sulfate, acrylic acid and water, wherein the concentration of sulfuric acid in the grafting solution is 0.2 mol / L, the concentration of ferrous sulfate is 0.002 mol / L, and the mass fraction of acrylic acid is 18%; Sc, under nitrogen protection, add the irradiated fiber obtained in step Sa into the grafting solution of step Sb, and react at 65℃ for 4 h, filter out the fiber, wash it with hot water at 90℃ for 3 times, and vacuum dry to constant weight to obtain the acrylic acid grafted polypropylene fiber. Example 11

[0063] The acrylic acid grafted polypropylene fiber of the embodiment is prepared by the following steps: Sa, irradiate the polypropylene fiber under Co 60 ray at a radiation rate of 100 Gy / min for 6.5 h to obtain irradiated fiber, which is refrigerated for standby; Sb, prepare a grafting solution by using sulfuric acid, ferrous sulfate, acrylic acid and water, wherein the concentration of sulfuric acid in the grafting solution is 0.25 mol / L, the concentration of ferrous sulfate is 0.004 mol / L, and the mass fraction of acrylic acid is 20%; Sc, under nitrogen protection, add the irradiated fiber obtained in step Sa into the grafting solution of step Sb, and react at 65℃ for 4 h, filter out the fiber, wash it with hot water at 90℃ for 3 times, and vacuum dry to constant weight to obtain the acrylic acid grafted polypropylene fiber. Example 12

[0064] The acrylic acid grafted polypropylene fiber of the embodiment is prepared by the following steps: Sa, irradiate polypropylene fibers under Co 60 for 6.5 h to obtain irradiated fibers, which are refrigerated for later use; Sb, prepare a grafting solution with sulfuric acid, ferrous sulfate, acrylic acid and water, the concentration of sulfuric acid in the grafting solution being 0.25 mol / L, the concentration of ferrous sulfate being 0.004 mol / L, and the mass fraction of acrylic acid being 24%; Sc, under nitrogen protection, add the irradiated fibers obtained in step Sa to the grafting solution of step Sb, and react at 65℃ for 4 h, filter out the fibers, wash them with hot water at 90℃ for 3 times, and vacuum dry to constant weight to obtain acrylic acid grafted polypropylene fibers. Example 13

[0065] The acrylic acid grafted polypropylene fibers of this example are prepared by the following steps: Sa, irradiate polypropylene fibers under Co 60 for 6.5 h to obtain irradiated fibers, which are refrigerated for later use; Sb, prepare a grafting solution with sulfuric acid, ferrous sulfate, acrylic acid and water, the concentration of sulfuric acid in the grafting solution being 0.25 mol / L, the concentration of ferrous sulfate being 0.004 mol / L, and the mass fraction of acrylic acid being 20%; Sc, under nitrogen protection, add the irradiated fibers obtained in step Sa to the grafting solution of step Sb, and react at 70℃ for 4 h, filter out the fibers, wash them with hot water at 90℃ for 3 times, and vacuum dry to constant weight to obtain acrylic acid grafted polypropylene fibers. Example 14

[0066] The difference between this example and Example 13 is that the acrylic acid grafted polypropylene fibers are added in a mass ratio of A component to acrylic acid grafted polypropylene fibers of 12:1. Example 15

[0067] The difference between this example and Example 13 is that the acrylic acid grafted polypropylene fibers are added in a mass ratio of A component to acrylic acid grafted polypropylene fibers of 10:1. Example 16

[0068] The difference between this example and Example 13 is that the acrylic acid grafted polypropylene fibers are added in a mass ratio of A component to acrylic acid grafted polypropylene fibers of 8:1.

[0069] The same tests are performed on Examples 9-16, and the results are shown in Table 2 below.

[0070] Table 2 Test results of Examples 9-16 Compressive strength (MPa) Surface Shore hardness Tensile strength (MPa) Elongation at break (%) Example 9 85 82.6 51 135 Example 10 86 82.8 53 136 Example 11 88 82.9 57 136 Example 12 89 83.4 52 131 Example 13 88 82.8 58 137 Example 14 89 82.9 62 139 Example 15 90 83.0 64 140 Example 16 92 83.5 57 130 As can be seen from the data of Examples 9-13 in Table 2 compared with the data of Example 8 in Table 1, the performance of the flooring material of Examples 9-13 is superior to that of Example 8; and the performance of the flooring material of Example 11 and Example 13 is relatively more superior. It can be seen that, with the increase of the irradiation dose and the increase of the monomer concentration in the grafting liquid, the grafting rate will increase, and the increase of the grafting rate can further increase the crosslinking degree of the fiber and the system, thereby effectively improving the compression resistance and tensile resistance of the material; and when the grafting rate is too high, the crosslinking density of the fiber and the system will be too high, thereby causing the material to harden and the tensile resistance to decrease.

[0071] As can be seen from the data of Examples 14-16 in Table 2 compared with the data of Example 13, the performance of the flooring material of Examples 14-15 is superior to that of Example 13, and the performance of the flooring material of Example 16 is slightly lower than that of Example 13. It can be seen that, increasing the fiber addition amount can effectively improve the toughness of the material, and the compression resistance of the material will also slightly increase; however, when the fiber addition amount is too large, the material will also harden, and the tensile resistance will also decrease.

[0072] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A prefabricated pressure- and tensile-resistant polyurethane flooring material, characterized in that, The main raw materials of the flooring material include component A, component B, and toughening fibers; The mass proportions of components in component A include: 40-60 parts of epoxidized soybean oil modified polyol, 10-20 parts of polyester polyol, and 2-8 parts of silicone-based defoamer; component B is a curing agent, which is an aliphatic polyisocyanate curing agent; the toughening fiber is acrylic-grafted polypropylene fiber; the mass ratio of component A to component B is 6-8:1, and the mass ratio of component A to acrylic-grafted polypropylene fiber is 8-14:

1.

2. The prefabricated pressure- and tensile-resistant polyurethane flooring material according to claim 1, characterized in that, Component A also includes microsilica powder, and the amount of microsilica powder added is 6 to 12 parts.

3. The prefabricated pressure- and tensile-resistant polyurethane flooring material according to claim 1, characterized in that, The polyester polyol is selected from one or more of polybutylene adipate diol, polyhexyl adipate diol, polycaprolactone diol and / or polycarbonate diol.

4. The prefabricated pressure- and tensile-resistant polyurethane flooring material according to claim 1, characterized in that, The aliphatic polyisocyanate curing agent is selected from hexamethylene diisocyanate-based polyisocyanate curing agents.

5. The prefabricated pressure- and tensile-resistant polyurethane flooring material according to claim 1, characterized in that, The method for preparing the acrylic-grafted polypropylene fiber includes the following steps: Sa, Polypropylene fibers are subjected to an irradiation rate of 100 Gy / min in Co 60 Irradiated fibers were obtained by irradiation treatment under X-rays for 6-6.5 hours and then frozen for later use. Sb, prepare a grafting solution using sulfuric acid, ferrous sulfate, acrylic acid and water. The concentration of sulfuric acid in the grafting solution is 0.2~0.25 mol / L, the concentration of ferrous sulfate is 0.002~0.004 mol / L, and the mass fraction of acrylic acid is 18~24%. Sc. Under nitrogen protection, the irradiated fiber obtained in step Sa is added to the grafting solution in step Sb and reacted at 65~70℃ for more than 4 hours. The fiber is filtered out, washed with hot water at 85~90℃ more than 3 times, and vacuum dried to constant weight to obtain acrylic grafted polypropylene fiber.

6. The prefabricated pressure- and tensile-resistant polyurethane flooring material according to claim 1, characterized in that, The thickness of the flooring material is 8~20mm.

7. The prefabricated pressure- and tensile-resistant polyurethane flooring material according to claim 1, characterized in that, The silicone-based defoamer is a polysiloxane defoamer.

8. The prefabricated pressure- and tensile-resistant polyurethane flooring material according to claim 1, characterized in that, Component A also includes pigments, wherein the pigments are inorganic pigments, and the amount of pigments added is 4 to 10 parts.

9. The prefabricated pressure- and tensile-resistant polyurethane flooring material according to claim 1, characterized in that, The prefabricated pressure-resistant and tensile-resistant polyurethane plastic flooring material also includes a waterproof coating layer applied to the surface of the main body of the flooring material.

10. A method for preparing the prefabricated pressure- and tensile-resistant polyurethane flooring material according to claim 1, characterized in that, Includes the following steps: S1. Weigh each component of component A precisely according to the formula, then mix thoroughly, let stand to defoam, and obtain component A. S2. Mix component A and component B obtained in step S1 at a mass ratio of 6~8:1 to obtain a mixed adhesive solution. S3. Add acrylic grafted polypropylene fiber to the mixed adhesive obtained in step S2 at a mass ratio of component A to acrylic grafted polypropylene fiber of 8~14:1, stir and mix thoroughly to obtain a prepolymer solution. S4. After casting the prepolymer liquid obtained in step S3 into the required size, it is cured at room temperature to obtain a prefabricated pressure-resistant and tensile-resistant polyurethane plastic flooring material.