A preformed track mat and method of making the same

Abstract

The present application relates to the technical field of plastic track, especially to the IPC E01C13 field, and more particularly to a prefabricated track coiled material and a preparation method thereof.The prefabricated track coiled material comprises a bottom adhesive (1) and a prefabricated coiled material (2), and the preparation of the prefabricated coiled material (2) comprises an A component and a B component, wherein the raw materials of the A component comprise 65-80 parts of polyether polyol, 20-35 parts of diisocyanate; the raw materials of the B component comprise 10-20 parts of polyether polyol, 8-15 parts of polyurethane crosslinking agent, 15-20 parts of plasticizer, 0.5 parts of color paste, 40-55 parts of filler and 2-5 parts of drier.The polyether polyol comprises polyether polyol with a molecular weight of 2000 and polyether polyol with a molecular weight of 5000, and the weight ratio of the polyether polyol with a molecular weight of 2000 to the polyether polyol with a molecular weight of 5000 in the A component is 1:(1.5-3), which can improve the tensile strength (1.24 MPa) and impact absorption performance (43%) of the coiled material.

Description

Technical Field

[0001] This invention relates to the field of plastic running track technology, particularly to the field of IPC E01C13, and more specifically, to a prefabricated running track roll and its preparation method. Background Technology

[0002] Compared to cast-in-place polyurethane running tracks, precast polyurethane running track construction significantly shortens the construction period, reduces the impact of weather on the construction cycle, avoids acceptance risks caused by the addition of uncontrollable additives and auxiliary materials during on-site construction, and ensures uniformity of thickness through standardized precast production processes. Existing products are generally cast-in-place polyurethane running tracks. Cast-in-place polyurethane running tracks, because they are constructed by mixing components A and B on-site, are greatly affected by ambient temperature and have the following disadvantages: the diluent causes volatile solvent pollution; cast-in-place materials are prone to problems such as incorrect proportions, inaccurate weighing, and insufficient mixing, affecting the quality and lifespan of the track; and excessive material usage increases costs.

[0003] CN110540674A discloses a solvent-free foamed polyurethane prefabricated elastic layer for plastic running tracks and its preparation method. The advantages of this invention are a significantly lower cost compared to existing commercially available prefabricated rubber elastic layers for running tracks. Through formula design and foaming process, its impact absorption and vertical deformation performance meet national standards, with zero VOC release. However, the process is relatively complex, and with the implementation of the new national standards, the physical properties of impact absorption and vertical deformation need to be adjusted. Summary of the Invention

[0004] The first aspect of this invention provides a prefabricated runway roll material, comprising a base adhesive and a prefabricated roll material. The preparation of the prefabricated roll material includes component A and component B. By weight, component A comprises 65-80 parts of polyether polyol and 20-35 parts of diisocyanate; component B comprises 10-20 parts of polyether polyol, 8-15 parts of polyurethane crosslinking agent, 15-20 parts of plasticizer, 0.5 parts of color paste, 40-55 parts of filler, and 2-5 parts of drying agent.

[0005] The molecular weight of the polyether polyol is 1000-10000.

[0006] Preferably, the polyether polyol has a molecular weight of 2000-5000.

[0007] The applicant discovered that selecting two polyether polyols with molecular weights of 2000 and 5000 can effectively improve the impact absorption performance of roll materials. This may be because the soft segments of different molecular weights form a cross-penetrating network, increasing the number of physical cross-linking points while reducing the regularity of the three-dimensional network structure, thus improving the structural toughness and resilience. Further research revealed that limiting the ratio of the two polyether polyols in components A and B can further improve tensile strength. This may be because the specific ratio of polyether polyols with molecular weights of 2000 and 5000 leads to inter-segment interactions and increases the number of ether bonds in the molecular structure. The presence of ester groups allows for complementary end groups between molecules, increasing tensile strength. When used in conjunction with specific fillers and molds, including talc and kaolin in a weight ratio of (2-4):1, it further improves vertical deformation performance and anti-slip value. This may be due to the reaction of polyether polyols of specific molecular weights to form polyurethane, which promotes the distribution of fillers in the porous structure and provides support and reinforcement for the three-dimensional structure of polyurethane. At the same time, the layered structure of talc and the kaolin composed of silicon-oxygen tetrahedra and aluminum-hydrogen-oxygen octahedra promote their insertion between polyurethane chain segments, thereby forming a serrated structure on the surface and increasing the anti-slip value.

[0008] More preferably, the polyether polyols include polyether polyols with a molecular weight of 2000 and 5000, wherein the weight ratio of the polyether polyols with a molecular weight of 2000 and 5000 in component A is 1:(1.5-3); and the weight ratio of the polyether polyols with a molecular weight of 2000 and 5000 in component B is 1:(0.5-2).

[0009] Preferably, the weight ratio of polyether polyols with a molecular weight of 2000 and 5000 in component A is 1:2.25; and the weight ratio of polyether polyols with a molecular weight of 2000 and 5000 in component B is 1:2.

[0010] Further preferably, the polyether polyol with a molecular weight of 2000 is from Dow Chemical and is model number 2000LM; the polyether polyol with a molecular weight of 5000 is from Sanda and is model number polyether 330N.

[0011] The filler includes at least one of calcium carbonate, kaolin, talc, graphite, high alumina powder, and quartz powder.

[0012] Preferably, the filler includes talc powder and kaolin, and the weight ratio of talc powder to kaolin is (2-4):1.

[0013] More preferably, the filler comprises talc powder and kaolin, wherein the weight ratio of talc powder to kaolin is 3:1.

[0014] The mesh size of the filler is 500-2000 mesh.

[0015] Preferably, the mesh size of the filler is 600-1500 mesh.

[0016] More preferably, the talc powder has a mesh size of 600 and the kaolin has a mesh size of 1250, both purchased from Lingshou County Nanyu Mineral Products Processing Plant.

[0017] The plasticizer includes at least one of polybutene, chlorinated fatty acid methyl esters, long-chain chlorinated paraffin, epoxy fatty acid methyl esters, and chlorinated palm oil formate.

[0018] Preferably, the plasticizer comprises long-chain chlorinated paraffin.

[0019] More preferably, the viscosity (50°C) of the long-chain chlorinated paraffin is 100-400 mPa·s.

[0020] More preferably, the long-chain chlorinated paraffin has a viscosity (50°C) of 150-250 mPa·s, and is purchased from Sendi Chemical, model: chlorinated paraffin 52.

[0021] The polyurethane crosslinking agent includes at least one of MOCA (3,3'-dichloro-4,4'-diaminodiphenylmethane), butanediol, trimethylolpropane, liquid MOCA, glycerol, glycerol, ethylene glycol, diethylene glycol, and propylene glycol.

[0022] Preferably, the polyurethane crosslinking agent comprises liquid MOCA, purchased from Guangzhou Yourun Synthetic Materials Co., Ltd.

[0023] Preferably, the color paste includes at least one of red, purple, green, and yellow, and is purchased from Zhuji Jucai Pigment Factory.

[0024] The diisocyanate includes at least one of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, and hexamethylene diisocyanate.

[0025] Preferably, the diisocyanate includes diphenylmethane diisocyanate (CAS: 101-68-8).

[0026] The environmentally friendly drying agent includes organic zinc, which was purchased from Jinan Rongzheng Chemical Co., Ltd.

[0027] A second aspect of the present invention provides a method for preparing prefabricated runway rolls, comprising the following steps:

[0028] Step 1: Weigh the raw materials from component A and component B according to the specified proportions;

[0029] Step 2: Preparation of Component A: Add the polyether polyol from Component A into the reactor, heat to 95-105℃, evacuate for 0.5-2 hours, cool to 60-85℃, add diisocyanate, and control the temperature to 75-83℃.

[0030] The reaction takes 1-3 hours;

[0031] Step 3: Preparation of Component B: The raw materials of Component B are put into a mixing tank for pre-dispersion, and the temperature is adjusted and a vacuum is drawn.

[0032] Step 4: Cool the prepared components A and B to 20-45℃, mix and stir evenly, pour into the mold, and thermoform to obtain the prefabricated roll material;

[0033] Step 5: Apply the base adhesive to the bottom of the precast roll material.

[0034] The ratio of the thickness of the bottom adhesive to the thickness of the precast roll material is (0.5-2):(10-15).

[0035] Preferably, the ratio of the bottom adhesive to the thickness of the precast roll material is 1:13.

[0036] The thermoforming temperature is 65-75℃, and the thermoforming time is 15-30 minutes.

[0037] Preferably, the thermoforming temperature is 70°C and the thermoforming time is 20 minutes.

[0038] The weight ratio of component A to component B is 1:(2.5-5).

[0039] Preferably, the weight ratio of component A to component B is 1:3.

[0040] Beneficial effects:

[0041] 1. The polyether polyols include polyether polyols with molecular weights of 2000 and 5000. The weight ratio of polyether polyols with molecular weights of 2000 and 5000 in component A is 1:(1.5-3); the weight ratio of polyether polyols with molecular weights of 2000 and 5000 in component B is 1:(0.5-2), which can improve the tensile strength (1.24MPa) and impact absorption performance (43%) of the roll material.

[0042] 2. The filler includes talc powder and kaolin, and the weight ratio of talc powder to kaolin is (2-4):1, which can reduce the weight of materials and reduce costs, while also improving the vertical deformation performance (2mm) and the anti-slip value (78).

[0043] 3. The thermoforming temperature is 65-75℃ and the thermoforming time is 15-30min, which can balance the tensile strength and elongation at break of the roll material. Attached Figure Description

[0044] Figure 1 This is a structural schematic diagram of prefabricated runway rolls.

[0045] Figure 2 This is the front side of the prefabricated runway roll material.

[0046] Figure 3 This is the back side of the prefabricated runway roll material.

[0047] Explanation of reference numerals in the attached diagram: 1. Underlying adhesive; 2. Precast roll material. Detailed Implementation

[0048] Example 1

[0049] A type of prefabricated running track roll, such as Figure 1 As shown, the pre-fabricated roll material 2 is a base adhesive 1. The pre-fabricated roll material 2 is prepared by components A and B. By weight, component A consists of 65 parts polyether polyol and 20 parts diisocyanate; component B consists of 15 parts polyether polyol, 8 parts polyurethane crosslinking agent, 15 parts plasticizer, 0.5 parts color paste, 30 parts talc, 10 parts kaolin, and 2 parts environmentally friendly drying agent.

[0050] The bottom adhesive 1 is produced by our company, model: 215 reinforcement layer. This reinforcement layer is a two-component AB, and should be mixed at a ratio of 1:4 when used.

[0051] The polyether polyols in component A have molecular weights of 2000 and 5000, with 20 parts by weight of the 2000 molecular weight polyether polyol and 45 parts by weight of the 5000 molecular weight polyether polyol.

[0052] The polyether polyols in component B have molecular weights of 2000 and 5000, with 5 parts by weight of the 2000 molecular weight polyether polyol and 10 parts by weight of the 5000 molecular weight polyether polyol.

[0053] The polyether polyol with a molecular weight of 2000 is from Dow Chemical and is model number 2000LM; the polyether polyol with a molecular weight of 5000 is from Sanda and is model number polyether 330N.

[0054] The talc powder has a mesh size of 600, and the kaolin has a mesh size of 1250; both were purchased from Lingshou County Nanyu Mineral Products Processing Plant.

[0055] The plasticizer is a long-chain chlorinated paraffin with a viscosity (50℃) of 150-250 mPa·s, purchased from Sendi Chemical, model: chlorinated paraffin 52.

[0056] The polyurethane crosslinking agent is liquid MOCA, purchased from Guangzhou Yourun Synthetic Materials Co., Ltd.

[0057] The pigment paste is fluorescent yellow, purchased from Zhuji Jucai Pigment Factory.

[0058] The diisocyanate is diphenylmethane diisocyanate (CAS: 101-68-8).

[0059] The environmentally friendly drying agent is organic zinc, purchased from Jinan Rongzheng Chemical Co., Ltd.

[0060] A method for preparing prefabricated runway roll material includes the following steps:

[0061] Step 1: Weigh the raw materials from component A and component B;

[0062] Step 2: Preparation of component A: Add the polyether polyol in component A into the reactor, heat to 100°C, evacuate for 1.5 hours, cool to 75°C, add diisocyanate, control the temperature to 80°C, and react for 2 hours.

[0063] Step 3: Preparation of Component B: The raw materials of Component B are put into a mixing vessel and pre-dispersed at 200 rpm. The temperature is controlled at 110℃ and vacuum is applied until the vacuum pressure reaches -0.085 MPa for 2 hours.

[0064] Step 4: Cool the prepared components A and B to 25°C, mix and stir evenly at 200 rpm, pour into a mold (one side is uneven and the other side is a mesh surface), and thermoform to obtain pre-made roll material 2;

[0065] Step 5: Apply the bottom adhesive 1 to the bottom of the precast roll material 2, and you will get the desired result. Figure 2 The image shown is the front of a prefabricated runway roll, as... Figure 3 The image shows the back of the prefabricated runway roll.

[0066] The thickness ratio of the bottom adhesive 1 to the precast roll 2 is 1:13, and the thickness of the precast roll 2 is 13mm.

[0067] The thermoforming temperature is 70°C and the thermoforming time is 20 minutes.

[0068] The weight ratio of component A to component B is 1:3.

[0069] Example 2

[0070] The specific implementation method is the same as in Example 1; the difference is that, in Example 2, by weight, component A is 75 parts polyether polyol and 25 parts diisocyanate; component B is 20 parts polyether polyol, 10 parts polyurethane crosslinking agent, 18 parts plasticizer, 0.5 parts color paste, 35 parts talc, 10 parts kaolin, and 3 parts environmentally friendly drying agent.

[0071] The polyether polyols in component A have molecular weights of 2000 and 5000, with 25 parts by weight of the 2000 molecular weight polyether polyol and 50 parts by weight of the 5000 molecular weight polyether polyol.

[0072] The polyether polyols in component B have molecular weights of 2000 and 5000, with 10 parts by weight of the 2000 molecular weight polyether polyol and 10 parts by weight of the 5000 molecular weight polyether polyol.

[0073] Example 3

[0074] The specific implementation method is the same as in Example 1; the difference is that, in Example 3, by weight, component A is 75 parts polyether polyol and 30 parts diisocyanate; component B is 20 parts polyether polyol, 15 parts polyurethane crosslinking agent, 20 parts plasticizer, 0.5 parts color paste, 40 parts talc, 15 parts kaolin, and 5 parts environmentally friendly drying agent.

[0075] The polyether polyols in component A have molecular weights of 2000 and 5000, with 30 parts by weight of the 2000 molecular weight polyether polyol and 45 parts by weight of the 5000 molecular weight polyether polyol.

[0076] The polyether polyols in component B have molecular weights of 2000 and 5000, with 10 parts by weight of the 2000 molecular weight polyether polyol and 10 parts by weight of the 5000 molecular weight polyether polyol.

[0077] Example 4

[0078] The specific implementation method is the same as in Example 1; the difference is that, in Example 4, by weight, component A is 80 parts of polyether polyol and 35 parts of diisocyanate; component B is 15 parts of polyether polyol, 10 parts of polyurethane crosslinking agent, 20 parts of plasticizer, 0.5 parts of color paste, 35 parts of talc, 15 parts of kaolin, and 3 parts of environmentally friendly drying agent.

[0079] The polyether polyols in component A have molecular weights of 2000 and 5000, with 30 parts by weight of the 2000 molecular weight polyether polyol and 50 parts by weight of the 5000 molecular weight polyether polyol.

[0080] The polyether polyols in component B have molecular weights of 2000 and 5000, with 10 parts by weight of the 2000 molecular weight polyether polyol and 5 parts by weight of the 5000 molecular weight polyether polyol.

[0081] Example 5

[0082] The specific implementation method is the same as in Example 1; the difference is that, in Example 5, by weight, component A is 80 parts of polyether polyol and 35 parts of diisocyanate; component B is 20 parts of polyether polyol, 10 parts of polyurethane crosslinking agent, 20 parts of plasticizer, 0.5 parts of color paste, 40 parts of talc, 15 parts of kaolin, and 3 parts of environmentally friendly drying agent.

[0083] The polyether polyols in component A have molecular weights of 2000 and 5000, with 25 parts by weight of the 2000 molecular weight polyether polyol and 55 parts by weight of the 5000 molecular weight polyether polyol.

[0084] The polyether polyols in component B have molecular weights of 2000 and 5000, with 10 parts by weight of the 2000 molecular weight polyether polyol and 10 parts by weight of the 5000 molecular weight polyether polyol.

[0085] Example 6

[0086] The specific implementation method is the same as in Example 1; the difference is that, in Example 6, by weight, component A is 80 parts of polyether polyol and 30 parts of diisocyanate; component B is 15 parts of polyether polyol, 15 parts of polyurethane crosslinking agent, 15 parts of plasticizer, 0.5 parts of color paste, 40 parts of talc, 10 parts of kaolin and 3 parts of environmentally friendly drying agent.

[0087] The polyether polyols in component A have molecular weights of 2000 and 5000, with 20 parts by weight of the 2000 molecular weight polyether polyol and 60 parts by weight of the 5000 molecular weight polyether polyol.

[0088] The polyether polyols in component B have molecular weights of 2000 and 5000, with 5 parts by weight of the 2000 molecular weight polyether polyol and 10 parts by weight of the 5000 molecular weight polyether polyol.

[0089] Comparative Example 1

[0090] The specific implementation method is the same as in Example 1; the difference is that in Comparative Example 1, the weight parts of 2000 molecular weight polyether polyol in component A are 30 parts, and the weight parts of 5000 molecular weight polyether polyol are 35 parts.

[0091] Comparative Example 2

[0092] The specific implementation method is the same as in Example 1; the difference is that in Comparative Example 2, the weight parts of 2000 molecular weight polyether polyol in component A are 15 parts, and the weight parts of 5000 molecular weight polyether polyol are 50 parts.

[0093] Comparative Example 3

[0094] The specific implementation method is the same as in Example 1; the difference is that in Comparative Example 3, 20 parts of talc powder and 20 parts of kaolin are added to Component B.

[0095] Performance testing methods

[0096] The rolls prepared in the examples and comparative examples were subjected to performance tests, and the test data are listed in Table 1.

[0097] The tensile strength, elongation at break, impact absorption, total volatile organic compound (TVOC) content, vertical deformation, and anti-slip value (BPN.20℃) were tested in accordance with GB36246-2018 standard.

[0098] Performance test data

[0099] Table 1

[0100]

[0101]

Claims

1. A preformed track mat, characterised in that, The adhesive (1) comprises a bottom layer adhesive (1), a preformed roll (2), the preparation of the preformed roll (2) comprises A component and B component, by weight parts, the raw materials of the A component include 65-80 parts of polyether polyol, 20-35 parts of diisocyanate; the raw materials of the B component include 10-20 parts of polyether polyol, 8-15 parts of polyurethane crosslinking agent, 15-20 parts of plasticizer, 0.5 parts of color paste, 40-55 parts of filler, 2-5 parts of drier; the polyether polyol includes polyether polyol with molecular weight 2000 and molecular weight 5000, the weight ratio of polyether polyol with molecular weight 2000 and molecular weight 5000 in the A component is 1: (1.5-3); the weight ratio of polyether polyol with molecular weight 2000 and molecular weight 5000 in the B component is 1: (0.5-2); the filler includes talc, kaolin, and the weight ratio of talc and kaolin is (2-4):

1.

2. A preformed track mat as claimed in claim 1, wherein, The number of the filler is 500-2000.

3. A preformed track mat as claimed in claim 1, wherein, The plasticizer includes at least one of polybutene, chlorinated fatty acid methyl ester, long-chain chlorinated paraffin, epoxy fatty acid methyl ester, and chlorinated palm oil formate.

4. A preformed track mat as defined in claim 1, wherein, The diisocyanate includes at least one of toluene diisocyanate, isophorone diisocyanate, diphenyl methane diisocyanate, dicyclohexyl methane diisocyanate, and hexamethylene diisocyanate.

5. A method of manufacturing the preformed track mat of claim 1, wherein, The method comprises the following steps: Step 1: weigh the raw materials in the A component and the B component according to the proportion; Step 2: prepare the A component: put the polyether polyol in the A component into the reaction kettle, heat to 95-105℃, vacuum for 0.5-2h, cool to 60-85℃, add diisocyanate, control the temperature to 75-83℃, and react for 1-3h; Step 3: prepare the B component: put the raw materials of the B component into the mixing agitator for pre-dispersion, adjust the temperature for vacuumizing; Step 4: cool the prepared A component and B component to 20-45℃, mix and stir uniformly, pour into the mold, hot form, and obtain the preformed roll (2); Step 5: coat the bottom layer adhesive (1) on the bottom of the preformed roll (2), and obtain the product.

6. The method of claim 5, wherein the preformed track is a continuous loop. The thickness ratio of the bottom layer adhesive (1) and the preformed roll (2) is (0.5-2):(10-15).

7. The method of claim 6, wherein the preformed track is a continuous loop. 7 The hot forming temperature is 65-75℃, and the hot forming time is 15-30min.

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