Preparation process of flexible plastic sports field material

Abstract

The invention discloses a preparation process of a flexible plastic sports field material, and relates to the technical field of high-molecular compounds, and the preparation process comprises a raw material preparation part, a mixed melting part and an extrusion granulation part; the raw material preparation part comprises the step of preparing a butadiene-propylene copolymer, PP, EVA, PS, a filler and an auxiliary agent which serve as raw materials; the step of mixing and melting comprises the following steps: preliminarily stirring 40-50 parts by weight of butadiene-propylene copolymer, adding 8-12 parts by weight of PP, 2-5 parts by weight of EVA, 4-7 parts by weight of PS, 26-32 parts by weight of filler and 1.5-9 parts by weight of auxiliaries into the preliminarily stirred butadiene-propylene copolymer, and continuously stirring to form a mixed material; and controlling the temperature of the mixed material to 78-82 DEG C, and introducing the mixed material into a stock bin of an extruder. The method has the effect of solving the problems of insufficient mechanical strength and low flexibility caused by non-uniform dispersion.

Description

Technical Field

[0001] The present application relates to the technical field of polymer compounds, and in particular to a preparation process of a flexible plastic sports field material. Background Art

[0002] Plastic sports fields are generally paved with polyurethane prepolymers, mixed polyethers, waste tire rubber, EPDM rubber particles or PU particles, pigments, additives and fillers. The plastic sports field can produce an appropriate rebound force for athletes through appropriate elasticity, while also protecting the joints and ligaments of athletes and reducing the risk of injury. The plastic track also has excellent wear resistance, which can ensure the long-term stability of the plastic track structure.

[0003] A Chinese patent with announcement number CN105801758B discloses an environmentally friendly resin for use in plastic sports fields and a preparation method thereof. The environmentally friendly resin for use in plastic sports fields is prepared by polymerization using acrylate monomers as the main component, assisted by cross-linking monomers, hydroxyl monomers containing double bonds, functional monomers, etc. in an emulsifier and deionized water environment.

[0004] However, the reaction components of the environmentally friendly resin used in plastic sports fields are complex, the overall preparation process is difficult, and from a performance perspective, its maximum flexibility is 147.07% of the elongation at break, and the corresponding maximum tensile strength is 1.42MPa, which is difficult to match the growing demand for sports and needs to be improved. Summary of the invention

[0005] In view of this, the purpose of this application is to provide a preparation process of a flexible plastic sports field material to achieve the purpose of improving flexibility and mechanical strength. The specific scheme is as follows: A preparation process of a flexible plastic sports field material, comprising a raw material preparation part, a mixing and melting part, and an extrusion granulation part; The raw material preparation part includes preparing butadiene-propylene copolymer, PP, EVA, PS, fillers and additives as raw materials; The mixed melting part comprises preliminarily stirring 40-50 parts by weight of a butadiene-propylene copolymer, adding 8-12 parts by weight of PP, 2-5 parts by weight of EVA, 4-7 parts by weight of PS, 26-32 parts by weight of a filler and 1.5-9 parts by weight of an auxiliary agent to the preliminarily stirred butadiene-propylene copolymer, continuing to stir to form a mixed material, and controlling the temperature of the mixed material to reach 78-82° C. before introducing the mixed material into a silo of an extruder; The extrusion granulation part includes using an extruder die head to extrude the molten mixture and an underwater pelletizer blade to cut to obtain material particles; Among them, the butadiene-propylene copolymer is composed of a high molecular weight butadiene-propylene copolymer with a molecular weight greater than 20,000 and a low molecular weight butadiene-propylene copolymer with a molecular weight less than 2,000, which are mixed in a mass percentage of 27.5-32.5:12.5-17.5; and the high molecular weight butadiene-propylene copolymer is obtained by graft modification of a matrix resin with a first active graft monomer and a second active graft monomer and has a first active group and a second active group; the low molecular weight butadiene-propylene copolymer is composed of a matrix resin grafted with a third active group; the first active group and the second active group crosslink with each other, the first active group and the third active group crosslink with each other, and the second active group and the third active group crosslink with each other.

[0006] Preferably: the first active group is an isocyanate group; the second active group is an amino group.

[0007] Preferably: the graft modification is melt graft modification, and the grafting rate is 0.1-2%.

[0008] Preferably: the third active group is a hydroxyl group, a carboxyl group, a sulfonic acid group or an acyl chloride group.

[0009] Preferably: the graft modification is copolymerization or melt graft modification, and the grafting rate is 1-5%.

[0010] Preferably: the auxiliary agent includes 1.5-2.5 parts by weight of a compatibilizer.

[0011] Preferably: the auxiliary agent also includes 2-3.5 parts by weight of antioxidant UV, 1.5-2.5 parts by weight of a lubricant, and 0-1 part by weight of white oil.

[0012] Preferably: in the mixing and melting part, first stir and mix the high molecular weight butadiene-propylene copolymer and the low molecular weight butadiene-propylene copolymer for 10-20 min, then add white oil and stir until completely absorbed, and finally add PP, EVA, PS, filler and auxiliary agent.

[0013] Preferably: the number of die holes of the extruder is 20-40, the hole diameter is 2-3 mm, the rotation speed is 300-400 r / min, the feeding is 15 Hz, the current is 150 V, and the number of blades of the underwater pelletizer is 6, and the rotation speed is 2,600-4,200 r / min.

[0014] Preferably: the filler is calcium powder.

[0015] Through the above scheme, it can be seen that the present application provides a preparation process of a flexible plastic sports ground material, and the preparation process of the flexible plastic sports ground material has the following beneficial effects: 1. By means of the cross-linking reaction between the first active group and the second active group on the high molecular weight butadiene-propylene copolymer and the third active group on the low molecular weight butadiene-propylene copolymer, the problems of insufficient mechanical strength and low flexibility caused by uneven dispersion among the butadiene-propylene copolymer, PP, EVA, PS and the filler are solved; 2. By mixing the butadiene-propylene copolymer obtained by mixing a high molecular weight butadiene-propylene copolymer with a molecular weight greater than 20000 and a low molecular weight butadiene-propylene copolymer with a molecular weight less than 2000 with PP, EVA, PS and the filler in corresponding proportions for mixing treatment, the effect of significantly improving flexibility and mechanical strength is achieved; 3. By means of the cross-linking and condensation reaction between isocyanate groups and amino groups and the cross-linking and condensation reaction between hydroxyl groups, carboxyl groups, sulfonic acid groups or acyl chloride groups, the components form a stable structure after mixing, and form a stable and high-strength adhesion structure with the laying ground during laying, playing a role in preventing detachment; 4. By means of the compatibilizer, antioxidant UV and lubricant, the mixing uniformity and compatibility among the components are further improved, and the antioxidant property is effectively enhanced, thereby prolonging the service life. Specific embodiments

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0017] It should be noted that the compatibilizer of the present application is a maleic anhydride grafted compatibilizer purchased from Nanjing Sute High Polymer Technology Co., Ltd., the antioxidant UV is antioxidant UV-531 purchased from Jinan Huifengda Chemical Co., Ltd., the lubricant is Durepol PBT HL NTLA010 BT314 purchased from Dongguan Yuhong Plastics Co., Ltd., the white oil is POWER OIL purchased from Wuhu Xinnuo Lubrication Technology Co., Ltd., the calcium powder is commercially available calcium carbonate, and PP, EVA and PS are all commercially available materials, which will not be elaborated here. The butadiene-propylene copolymer is a polymer obtained by polymerizing butadiene and propylene in any ratio, and is synthesized based on 40 °C using the existing TiCl4 / TEAL / carbonyl chloride catalyst, which will not be elaborated here.

[0018] Meanwhile, to complete the graft modification treatment of the first active group, the second active group, and the third active group, monomers containing corresponding isocyanate groups, such as toluene diisocyanate, cyclohexyl isocyanate, or 2-isopropyl-6-methylphenyl isocyanate, can be subjected to melt grafting reaction, and monomers containing amino groups, such as aniline, 4-bromo-1,2-phenylenediamine, ethyl 2-bromo-5-aminobenzoate, etc., can be subjected to melt grafting reaction, which will not be elaborated here.

[0019] The preparation process of the flexible plastic sports ground material of the present application will be specifically described below.

[0020] A preparation process of a flexible plastic sports ground material includes a raw material preparation part, a mixing and melting part, and an extrusion granulation part.

[0021] Among them: The raw material preparation part includes preparing a butadiene-propylene copolymer, PP, EVA, PS, filler, and auxiliary agent as raw materials; The mixing and melting part includes preliminarily stirring 40-50 parts by weight of the butadiene-propylene copolymer, and then adding 8-12 parts by weight of PP, 2-5 parts by weight of EVA, 4-7 parts by weight of PS, 26-32 parts by weight of the filler, and 1.5-9 parts by weight of the auxiliary agent to the preliminarily stirred butadiene-propylene copolymer, and continuing to stir to form a mixed material. After controlling the temperature of the mixed material to reach 78-82 °C, it is introduced into the hopper of the extruder. The filler is selected to be calcium powder, which has the effects of low cost and significantly improving the mechanical strength of the flexible plastic sports ground material.

[0022] The extrusion granulation part includes extruding the molten mixed material by an extruder die head and cutting it with the blades of an underwater pelletizer to obtain material particles.

[0023] It should be noted that in order to improve the dispersibility and affinity among the butadiene-propylene copolymer, PP, EVA, PS, filler, and auxiliary agent as raw materials, so as to effectively improve the mechanical properties and achieve the purpose of improving flexibility, the butadiene-propylene copolymer used is composed of a high molecular weight butadiene-propylene copolymer with a molecular weight greater than 20000 and a low molecular weight butadiene-propylene copolymer with a molecular weight less than 2000, which are mixed in a mass percentage of 27.5-32.5:12.5-17.5. And the high molecular weight butadiene-propylene copolymer is obtained by graft modification of a matrix resin with a first active graft monomer and a second active graft monomer and has a first active group and a second active group. The low molecular weight butadiene-propylene copolymer is composed of a matrix resin grafted with a third active group. It should be mentioned that the first active group and the second active group crosslink with each other, the first active group and the third active group crosslink with each other, and the second active group and the third active group crosslink with each other.

[0024] Therefore, while the first active group and the second active group on the high molecular weight butadiene-propylene copolymer crosslink with each other to form a cyclic structure, they crosslink and connect with each other between the first active group and the third active group, and between the second active group and the third active group to form a crosslinked network spatial structure. On the premise of effectively improving the mechanical properties, combined with the mixture of PP, EVA, PS, fillers and additives, the effect of effectively improving the flexibility is achieved.

[0025] In the embodiment of the present application, the first active group is an isocyanate group; the second active group is an amino group. Of course, the first active group and the second active group can also be other active groups that can crosslink with each other and can crosslink with the third active group respectively.

[0026] Specifically, the third active group is a hydroxyl group, a carboxyl group, a sulfonic acid group or an acyl chloride group. In the high molecular weight butadiene-propylene copolymer, the graft modification is melt graft modification, and the grafting rate is 0.1-2%. In the low molecular weight butadiene-propylene copolymer, the graft modification is copolymerization or melt graft modification, and the grafting rate is 1-5%.

[0027] In the embodiment of the present application, the additive includes 1.5-2.5 parts by weight of a compatibilizer. The compatibilizer has the effect of improving the interaction between incompatible polymers, and thus will significantly improve the compatibility and affinity during the mixing process of the high molecular weight butadiene-propylene copolymer, the low molecular weight butadiene-propylene copolymer, PP, EVA, PS and fillers in the embodiment of the present application.

[0028] At the same time, in order to further improve the service life of the flexible plastic sports ground material prepared by the preparation process of the flexible plastic sports ground material, the additive also includes 2-3.5 parts by weight of antioxidant UV, 1.5-2.5 parts by weight of lubricant and 0-1 part by weight of white oil.

[0029] White oil has the effects of color adjustment, improving reflection and extending the service life. In the mixing and melting part, first stir and mix the high molecular weight butadiene-propylene copolymer and the low molecular weight butadiene-propylene copolymer for 10-20 minutes, then add white oil and stir until completely absorbed, and finally add PP, EVA, PS, fillers and additives and stir and mix evenly. In the machine equipment used, control the number of die holes of the extruder to be 20-40, the hole diameter to be 2-3 mm, the rotation speed to be 300-400 r / min, the feeding rate to be 15 Hz, the current to be 150 V, and control the number of blades of the underwater pelletizer to be 6, and the rotation speed to be 2600-4200 r / min to obtain material particles with regular shape and specification. The filler is calcium powder.

[0030] Example 1 A preparation process of a flexible plastic sports field material, including a raw material preparation part, a mixing and melting part, and an extrusion and granulation part.

[0031] Among them: The raw material preparation part includes preparing butadiene-propylene copolymer, PP, EVA, PS, filler and additives as raw materials; The mixing and melting part includes initially stirring 40 parts by weight of butadiene-propylene copolymer, and then adding 8 parts by weight of PP, 2 parts by weight of EVA, 4 parts by weight of PS, 26 parts by weight of calcium powder and 1.5 parts by weight of compatibilizer to the initially stirred butadiene-propylene copolymer, and continuing to stir to form a mixed material. After controlling the temperature of the mixed material to reach 78 °C, it is introduced into the hopper of the extruder. The calcium powder has the functions of low cost and significantly improving the mechanical strength of the flexible plastic sports field material. The compatibilizer has the effect of improving the interaction between incompatible polymers, and thus during the mixing process of the high molecular weight butadiene-propylene copolymer, low molecular weight butadiene-propylene copolymer, PP, EVA, PS and filler in the first embodiment of the present application, the compatibility and affinity will be significantly improved.

[0032] The extrusion and granulation part includes extruding the molten mixed material by an extruder die head and cutting it with the blades of an underwater pelletizer to obtain material particles. In the first embodiment of the present application, the number of die holes of the extruder is controlled to be 20, the hole diameter is 2 mm, the rotation speed is 300 r / min, the feeding is 15 Hz, the current is 150 V, and the number of blades of the underwater pelletizer is controlled to be 6, and the rotation speed is 2600 r / min to obtain material particles with regular shape specifications.

[0033] It should be noted that in order to improve the dispersibility and affinity among the butadiene-propylene copolymer, PP, EVA, PS, filler and additives as raw materials, so as to effectively improve the mechanical properties and achieve the purpose of improving flexibility, the butadiene-propylene copolymer used is composed of a high molecular weight butadiene-propylene copolymer with a molecular weight greater than 20000 and a low molecular weight butadiene-propylene copolymer with a molecular weight less than 2000, which are mixed in a mass percentage of 27.5:12.5. And the high molecular weight butadiene-propylene copolymer is obtained by graft modification of a matrix resin with a first active graft monomer and a second active graft monomer and has a first active group and a second active group. The low molecular weight butadiene-propylene copolymer is composed of a matrix resin grafted with a third active group. It should be mentioned that the first active group and the second active group crosslink with each other, the first active group and the third active group crosslink with each other, and the second active group and the third active group crosslink with each other.

[0034] Therefore, while the first active group and the second active group on the high molecular weight butadiene-propylene copolymer crosslink with each other to form a cyclic structure, they crosslink and connect with each other between the first active group and the third active group, and between the second active group and the third active group to form a crosslinked network spatial structure. On the premise of effectively improving the mechanical properties, when mixed and combined with PP, EVA, PS, fillers and additives, the effect of effectively improving the flexibility is achieved.

[0035] In the first embodiment of the present application, the first active group is an isocyanate group, and the second active group is an amino group. Of course, the first active group and the second active group can also be other active groups that can crosslink with each other and can crosslink with the third active group respectively, which will not be elaborated here. However, it is preferably an isocyanate group as the first active group and an amino group as the second active group.

[0036] Specifically, the third active group is a sulfonic acid group. In the high molecular weight butadiene-propylene copolymer, the graft modification is melt graft modification, and the grafting rate of the first active group is 0.1%, and the grafting rate of the second active group is 0.3%. In the low molecular weight butadiene-propylene copolymer, the graft modification is copolymer graft modification, and the grafting rate is 1%.

[0037] Example Two A preparation process of a flexible plastic sports ground material includes a raw material preparation part, a mixing and melting part, and an extrusion granulation part.

[0038] Among them: The raw material preparation part includes preparing butadiene-propylene copolymer, PP, EVA, PS, fillers and additives as raw materials; The mixing and melting part includes preliminarily stirring 45 parts by weight of butadiene-propylene copolymer, and then adding 10 parts by weight of PP, 3 parts by weight of EVA, 5 parts by weight of PS, 30 parts by weight of calcium powder and 2 parts by weight of compatibilizer to the preliminarily stirred butadiene-propylene copolymer, and continuing to stir to form a mixed material. After controlling the temperature of the mixed material to reach 80°C, it is introduced into the hopper of the extruder. Calcium powder has the functions of low cost and significantly improving the mechanical strength of the flexible plastic sports ground material. The compatibilizer has the effect of improving the interaction between incompatible polymers, and thus will significantly improve the compatibility and affinity during the mixing process of the high molecular weight butadiene-propylene copolymer, low molecular weight butadiene-propylene copolymer, PP, EVA, PS and fillers in the second embodiment of the present application.

[0039] The extrusion granulation part includes extruding the molten mixed material by the die head of the extruder and cutting it with the blades of an underwater pelletizer to obtain material particles. In the second embodiment of the present application, the number of die holes of the extruder is controlled to be 30, the hole diameter is 2.5 mm, the rotation speed is 350 r / min, the feeding is 15 Hz, the current is 150 V, and the number of blades of the underwater pelletizer is controlled to be 6, and the rotation speed is 3000 r / min to obtain material particles with regular shape specifications.

[0040] It should be noted that in order to improve the dispersibility and affinity between the butadiene-propylene copolymer, PP, EVA, PS, filler and additive used as raw materials, so as to effectively improve the mechanical properties and achieve the purpose of improving flexibility, the butadiene-propylene copolymer used is composed of a high molecular weight butadiene-propylene copolymer with a molecular weight greater than 20000 and a low molecular weight butadiene-propylene copolymer with a molecular weight less than 2000, mixed in a mass percentage of 30:15. And the high molecular weight butadiene-propylene copolymer is obtained by graft modification of the matrix resin with the first active graft monomer and the second active graft monomer and has the first active group and the second active group. The low molecular weight butadiene-propylene copolymer is composed of the matrix resin grafted with the third active group. It should be mentioned that the first active group and the second active group crosslink with each other, the first active group and the third active group crosslink with each other, and the second active group and the third active group crosslink with each other.

[0041] Therefore, while the first active group and the second active group on the high molecular weight butadiene-propylene copolymer crosslink with each other to form a ring structure, through the crosslinking connection between the first active group and the third active group and between the second active group and the third active group to form a crosslinked network spatial structure, on the premise of effectively improving the mechanical properties, combined with the mixing of PP, EVA, PS, filler and additive, the effect of effectively improving flexibility is achieved.

[0042] In the second embodiment of the present application, the first active group is an isocyanate group and the second active group is an amino group. Of course, the first active group and the second active group can also be other active groups that can crosslink with each other and can crosslink with the third active group respectively, which will not be elaborated here. But preferably, the isocyanate group is used as the first active group and the amino group is used as the second active group.

[0043] Specifically, the third active group is a hydroxyl group. In the high molecular weight butadiene-propylene copolymer, the graft modification is melt graft modification, and the grafting rate of the first active group is 0.8%, and the grafting rate of the second active group is 1.2%. In the low molecular weight butadiene-propylene copolymer, the graft modification is melt graft modification, and the grafting rate is 2.5%.

[0044] Example Three A preparation process of a flexible plastic sports ground material, including a raw material preparation part, a mixing and melting part, and an extrusion and granulation part.

[0045] Among them: The raw material preparation part includes preparing butadiene-propylene copolymer, PP, EVA, PS, filler and additive as raw materials; The mixing and melting part includes preliminarily stirring 50 parts by weight of butadiene-propylene copolymer, and then adding 12 parts by weight of PP, 5 parts by weight of EVA, 7 parts by weight of PS, 32 parts by weight of calcium powder and 2.5 parts by weight of compatibilizer to the preliminarily stirred butadiene-propylene copolymer, and continuing to stir to form a mixed material. After controlling the temperature of the mixed material to reach 78-82 °C, it is introduced into the hopper of the extruder. The calcium powder has the functions of low cost and significantly improving the mechanical strength of the flexible plastic sports ground material. The compatibilizer has the effect of improving the interaction between incompatible polymers, and thus during the mixing process of the high molecular weight butadiene-propylene copolymer, low molecular weight butadiene-propylene copolymer, PP, EVA, PS and filler in Example 3 of the present application, the compatibility and affinity will be significantly improved.

[0046] The extrusion and granulation part includes extruding the molten mixed material by the die head of the extruder and cutting it with the blades of an underwater pelletizer to obtain material particles. In Example 3 of the present application, the number of die holes of the extruder is controlled to be 40, the hole diameter is 3 mm, the rotation speed is 400 r / min, the feeding is 15 Hz, the current is 150 V, and the number of blades of the underwater pelletizer is controlled to be 6, and the rotation speed is 4200 r / min to obtain material particles with regular shape and specifications.

[0047] It should be noted that in order to improve the dispersibility and affinity among the butadiene-propylene copolymer, PP, EVA, PS, filler and additive as raw materials, so as to effectively improve the mechanical properties and achieve the purpose of improving flexibility, the butadiene-propylene copolymer used is composed of a high molecular weight butadiene-propylene copolymer with a molecular weight greater than 20000 and a low molecular weight butadiene-propylene copolymer with a molecular weight less than 2000, which are mixed in a mass percentage of 32.5:17.5. And the high molecular weight butadiene-propylene copolymer is obtained by graft modification of the matrix resin with the first active graft monomer and the second active graft monomer and has the first active group and the second active group. The low molecular weight butadiene-propylene copolymer is composed of the matrix resin grafted with the third active group. It should be mentioned that the first active group and the second active group crosslink with each other, the first active group and the third active group crosslink with each other, and the second active group and the third active group crosslink with each other.

[0048] Therefore, while the first active group and the second active group on the high molecular weight butadiene-propylene copolymer crosslink with each other to form a cyclic structure, they crosslink and connect with each other between the first active group and the third active group, and between the second active group and the third active group to form a crosslinked network spatial structure. On the premise of effectively improving the mechanical properties, combined with the mixing of PP, EVA, PS, fillers and additives, the effect of effectively improving the flexibility is achieved.

[0049] In Example 3 of the present application, the first active group is an isocyanate group, and the second active group is an amino group. Of course, the first active group and the second active group can also be other active groups that can crosslink with each other, and can crosslink and react with the third active group respectively, which will not be elaborated here. However, it is preferably an isocyanate group as the first active group and an amino group as the second active group.

[0050] Specifically, the third active group is an acyl chloride group. In the high molecular weight butadiene-propylene copolymer, the graft modification is melt graft modification, and the grafting rate of the first active group is 2%, and the grafting rate of the second active group is 1.4%. In the low molecular weight butadiene-propylene copolymer, the graft modification is melt graft modification, and the grafting rate is 5%.

[0051] Example 4 The difference between Example 4 and Example 2 is that the additives in Example 4 also include 2 parts by weight of antioxidant UV and 1.5 parts by weight of lubricant.

[0052] The corresponding weight parts of the compatibilizer, antioxidant UV and lubricant are synchronously introduced into the mixed material.

[0053] Example 5 The difference between Example 5 and Example 2 is that the additives in Example 5 also include 3 parts by weight of antioxidant UV, 2 parts by weight of lubricant and 0.2 parts by weight of white oil. White oil has the effects of color adjustment, improving reflection and extending service life. In the mixing and melting part, the high molecular weight butadiene-propylene copolymer and the low molecular weight butadiene-propylene copolymer are first stirred and mixed for 16 min, then white oil is added and stirred until completely absorbed, and finally PP, EVA, PS, fillers and additives are added and stirred and mixed evenly.

[0054] Example 6 Example 6 is different from Example 2 in that the additives in Example 6 further include 3.5 parts by weight of antioxidant UV, 2.5 parts of lubricant, and 1 part of white oil. White oil has the effects of color adjustment, improving reflection, and extending service life. In the mixing and melting part, the high molecular weight butadiene-propylene copolymer and the low molecular weight butadiene-propylene copolymer are first stirred and mixed for 20 minutes, then white oil is added and stirred until completely absorbed, and finally PP, EVA, PS, filler, and additives are added and stirred and mixed evenly.

[0055] Comparative Example 1 Comparative Example 1 is different from Example 2 in that the high molecular weight butadiene-propylene copolymer in Comparative Example 1 only has the first active group.

[0056] Comparative Example 2 Comparative Example 2 is different from Example 2 in that the high molecular weight butadiene-propylene copolymer in Comparative Example 2 only has the first active group, and the third active group is an amino group.

[0057] Comparative Example 3 Comparative Example 3 is different from Example 2 in that the first active group in Comparative Example 3 is a carboxyl group.

[0058] Comparative Example 4 Comparative Example 4 is different from Example 2 in that the second active group in Comparative Example 4 is a hydroxyl group.

[0059] Comparative Example 5 Comparative Example 5 is different from Example 2 in that the butadiene-propylene copolymer in Comparative Example 5 is a high molecular weight butadiene-propylene copolymer without the first active group and the second active group.

[0060] Comparative Example 6 Comparative Example 6 is different from Example 2 in that EVA is not added in Comparative Example 6.

[0061] Performance test: The flexible plastic sports ground material experimental blocks obtained by the preparation process of the flexible plastic sports ground materials of Examples 1 to 6 and Comparative Examples 1 to 6 above are used. The thickness of the flexible plastic sports ground material experimental blocks is 13 mm, and they are in the shape of a 6 cm square. 6 cm square shape.

[0062] 1. Flexibility test, judged according to the elongation at break, defined in accordance with GB / T 10654-2001, 3.2; 2. Tensile strength test, judged according to the breaking strength, defined in accordance with GB / T 10654-2001, 3.1; 3. Abrasion resistance test: Friction treatment is carried out according to an abrasion resistance testing machine, and evaluations of excellent, good, poor, and relatively poor are given respectively based on the degree and scope of damage. 4. Adhesion test: Tensile strength test is carried out according to a tensile tester, and evaluations of excellent, good, poor, and relatively poor are given respectively based on the tensile strength.

[0063] Table 1 Performance test results

[0064] As can be seen from Table 1 above, the crosslinking effect between the high molecular weight butadiene-propylene copolymer grafted with the first active group and the second active group and the low molecular weight butadiene-propylene copolymer grafted with the third active group is better than that of the high molecular weight butadiene-propylene copolymer lacking the first active group and / or the second active group. In the preparation process, the flexible plastic sports ground material obtained has significantly improved flexibility, tensile strength, abrasion resistance, and adhesion. Especially when the grafting rates of the first active group and the second active group are between 0.8% and 2%, effective abrasion resistance and high adhesion effects are achieved, thus significantly extending the service life of the flexible plastic sports ground material prepared by the preparation process of this flexible plastic sports ground material. It should be noted that antioxidants UV, lubricants, and white oil have certain side effects on the flexibility and tensile strength of the obtained flexible plastic sports ground material, but the effects of antioxidation and extending the service life will be achieved. At the same time, the combination between EVA and the butadiene-propylene copolymer has a certain effect of improving flexibility.

[0065] In summary, the present application provides a preparation process for a flexible plastic sports ground material. The preparation process of the flexible plastic sports ground material solves the problems of insufficient mechanical strength and low flexibility caused by uneven dispersion among butadiene-propylene copolymer, PP, EVA, PS, and filler through the crosslinking reaction between the first active group and the second active group on the high molecular weight butadiene-propylene copolymer and the third active group on the low molecular weight butadiene-propylene copolymer. Meanwhile, since the butadiene-propylene copolymer is obtained by mixing a high molecular weight butadiene-propylene copolymer with a molecular weight greater than 20,000 and a low molecular weight butadiene-propylene copolymer with a molecular weight less than 2,000, the butadiene-propylene copolymer can achieve the effect of significantly improving flexibility and mechanical strength when further mixed with PP, EVA, PS, and filler in corresponding proportions. In the selection of the first active group, the second active group, and the third active group, the crosslinking and condensation reactions between isocyanate groups and amino groups, as well as the crosslinking and condensation reactions between isocyanate groups and amino groups and hydroxyl groups, carboxyl groups, sulfonic acid groups, or acyl chloride groups are innovatively adopted, so that the components form a stable structure after mixing and form a stable and high-strength adhesion structure with the laying ground during laying, playing a role in preventing detachment. In view of the fact that the flexible plastic sports ground material is usually used outdoors, a combination of compatibilizer, antioxidant UV, and lubricant is selected to further improve the mixing uniformity and compatibility among the components and effectively improve antioxidant properties, thereby achieving the effect of extending the service life.

[0066] The "first", "second", "third", "fourth", etc. (if any) involved in the present application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described here can be implemented in an order other than that described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, or devices.

[0067] It should be noted that the descriptions involving "first", "second", etc. in this application are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0068] Specific examples are used in this article to elaborate on the principles and implementation manners of this application. The description of the above embodiments is only for helping to understand the method and its core idea of this application; at the same time, for those of ordinary skill in the art, based on the idea of this application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A preparation process of a flexible plastic sports ground material, characterized in that: It includes a raw material preparation part, a mixing and melting part, and an extrusion and granulation part; The raw material preparation part includes preparing a butadiene-propylene copolymer, PP, EVA, PS, filler, and additives as raw materials; The mixing and melting part includes preliminarily stirring 40-50 parts by weight of the butadiene-propylene copolymer, and then adding 8-12 parts by weight of PP, 2-5 parts by weight of EVA, 4-7 parts by weight of PS, 26-32 parts by weight of the filler, and 1.5-9 parts by weight of the additives to the preliminarily stirred butadiene-propylene copolymer, and continuing to stir to form a mixed material. After controlling the temperature of the mixed material to reach 78-82 °C, it is introduced into the hopper of the extruder; The extrusion and granulation part includes extruding the molten mixed material by an extruder die head and cutting it with the blades of an underwater pelletizer to obtain material particles; Among them, the butadiene-propylene copolymer is composed of a high molecular weight butadiene-propylene copolymer with a molecular weight greater than 20000 and a low molecular weight butadiene-propylene copolymer with a molecular weight less than 2000, which are mixed in a mass percentage of 27.5-32.5:12.5-17.5; and the high molecular weight butadiene-propylene copolymer is obtained by graft modification of a matrix resin with a first active graft monomer and a second active graft monomer and has a first active group and a second active group; the low molecular weight butadiene-propylene copolymer is composed of a matrix resin grafted with a third active group; the first active group and the second active group crosslink with each other, the first active group and the third active group crosslink with each other, and the second active group and the third active group crosslink with each other.

2. The preparation process of a flexible plastic sports ground material according to claim 1, characterized in that: The first active group is an isocyanate group; the second active group is an amino group.

3. The preparation process of a flexible plastic sports ground material according to claim 2, characterized in that: The graft modification is melt graft modification, and the grafting rate is 0.1-2%.

4. The preparation process of a flexible plastic sports ground material according to claim 1, characterized in that: The third active group is a hydroxyl group, a carboxyl group, a sulfonic acid group, or an acyl chloride group.

5. The preparation process of a flexible plastic sports ground material according to claim 4, characterized in that: The graft modification is copolymerization or melt graft modification, and the grafting rate is 1-5%.

6. The preparation process of a flexible plastic sports ground material according to claim 1, characterized in that: The additives include 1.5-2.5 parts by weight of a compatibilizer.

7. The preparation process of a flexible plastic sports field material according to claim 6, characterized in that: The additives also include 2-3.5 parts by weight of antioxidant UV, 1.5-2.5 parts by weight of a lubricant, and 0-1 part by weight of white oil.

8. The preparation process of a flexible plastic sports ground material according to claim 7, characterized in that: In the mixing and melting part, first, the high molecular weight butadiene-propylene copolymer and the low molecular weight butadiene-propylene copolymer are stirred and mixed for 10-20 min, then white oil is added and stirred until completely absorbed, and finally, PP, EVA, PS, filler, and additives are added.

9. The preparation process of a flexible plastic sports ground material according to claim 1, characterized in that: The number of die holes of the extruder is 20-40, the hole diameter is 2-3 mm, the rotation speed is 300-400 r / min, the feeding is 15 Hz, the current is 150 V, and the number of blades of the underwater pelletizer is 6, and the rotation speed is 2600-4200 r / min.

10. The preparation process of a flexible plastic sports ground material according to claim 1, characterized in that: The filler is calcium powder.

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