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CN-122011532-A - Modified material for rubber runway starting area and preparation method thereof

CN122011532ACN 122011532 ACN122011532 ACN 122011532ACN-122011532-A

Abstract

The invention discloses a modified material for a rubber runway starting area and a preparation method thereof, which belong to the field of rubber runway materials and are prepared from the following raw materials, by weight, 100 parts of nitrile rubber and butadiene rubber, wherein the mass ratio of the nitrile rubber to the butadiene rubber is 6:4-4:6, 35-55 parts of polyurethane prepolymer with high NCO content, 8-18 parts of pretreated glass fiber, 90-130 parts of composite reinforcing filler, 1.5-2.5 parts of vulcanizing agent, 1.5-3 parts of composite vulcanization accelerator, 15-30 parts of plasticizer and softener, 2-4 parts of antioxidant and antioxidant, and 3-6 parts of pigment and ultraviolet absorber. The preparation method comprises the steps of pretreatment of glass fiber, plasticating and co-using rubber, primary mixing, secondary mixing and modification, final mixing and vulcanizing, compression molding and post-vulcanizing. The invention modifies the runway material by the glass fiber, and greatly improves the impact resistance, tearing resistance and fatigue resistance of local areas of the runway without obviously damaging the elasticity and the buffer function required by the runway.

Inventors

  • ZHU QINGDONG
  • ZHAO SHUWEN

Assignees

  • 四川师范大学

Dates

Publication Date
20260512
Application Date
20260311

Claims (7)

  1. 1. The modified material for the rubber runway starting area is characterized by being prepared from the following raw materials in parts by weight: 100 parts of butadiene-acrylonitrile rubber and butadiene rubber, wherein the mass ratio of the butadiene-acrylonitrile rubber to the butadiene-acrylonitrile rubber is 6:4-4:6, 35-55 parts of polyurethane prepolymer with high NCO content, 8-18 parts of pretreated glass fiber, 90-130 parts of composite reinforcing filler, 1.5-2.5 parts of vulcanizing agent, 1.5-3 parts of composite vulcanization accelerator, 15-30 parts of plasticizer and softener, 2-4 parts of antioxidant and 3-6 parts of pigment and ultraviolet absorber; The preparation method of the pretreated glass fiber comprises the following steps: a) Cleaning and dewaxing, namely placing the chopped alkali-free glass fiber into a muffle furnace, and performing heat treatment at 380-420 ℃ for 25-35 minutes to thoroughly remove the textile sizing agent on the surface of the chopped alkali-free glass fiber; b) Preparing a coupling agent treatment solution, namely mixing gamma-aminopropyl triethoxysilane, absolute ethyl alcohol and deionized water according to a mass ratio of 5:90:5, mechanically stirring for 30-45 minutes at a speed of 300-500rpm at room temperature until the solution is uniform and transparent, regulating the pH value to 4-5, standing and hydrolyzing for 1-2 hours for later use; c) C, soaking, namely soaking the glass fiber treated in the step a into the treatment liquid prepared in the step b to ensure complete soaking, wherein the soaking is carried out for 8-12 minutes; d) Drying and curing, namely taking out the glass fiber, placing the glass fiber in a blast drying oven at 110-130 ℃ for drying and curing for 20-30 minutes to obtain pretreated glass fiber, and sealing for later use; the composite reinforcing filler is a mixture of nano calcium carbonate, precipitated white carbon black and silica micropowder, and the mass ratio of the composite reinforcing filler to the silica micropowder is 4:4:2 to 3:5:2.
  2. 2. The modified material for a rubber runway starting area according to claim 1 wherein the acrylonitrile-butadiene rubber has an acrylonitrile content of 28% -34% and the cis-1, 4 structure content of the butadiene rubber is greater than 96%.
  3. 3. A rubber runway starting area modified material according to claim 1 wherein the high NCO content polyurethane prepolymer is prepared by reacting toluene diisocyanate with polyether polyol and has an NCO mass percent of 12% to 16%.
  4. 4. A rubber track initiation area modification material in accordance with claim 1, wherein said vulcanizing agent is one of sulfur or peroxide DCP.
  5. 5. The modified material for the starting area of the rubber runway according to claim 1, wherein the plasticizer and the softener are a mixture of dioctyl phthalate and liquid coumarone resin in a mass ratio of 1:1, and the composite vulcanization accelerator is compounded by accelerator CZ, accelerator DM and accelerator TRA in a mass ratio of 1.5:1:0.5.
  6. 6. The preparation method of the modified material of the rubber runway starting area is characterized by comprising the following steps of: s1, plasticating and combining the rubber, namely respectively plasticating the nitrile rubber and the butadiene rubber on an open mill in a thin way, and mixing the nitrile rubber and the butadiene rubber according to a proportion to obtain a combined rubber masterbatch; s2, one-stage mixing, namely adding the combined rubber masterbatch into an internal mixer, heating to 70-85 ℃, sequentially adding 2/3 of composite reinforcing filler, all plasticizers, softening agents, antioxidants and anti-aging agents, mixing for 8-12 minutes until the temperature reaches 125-135 ℃, discharging rubber, cooling and standing for more than 12 hours to obtain one-stage mixed rubber; S3, two-stage mixing and modification, namely, putting the first-stage mixing rubber into an internal mixer again, adding a polyurethane prepolymer with high NCO content at 80-95 ℃, mixing for 3-5 minutes to enable the polyurethane prepolymer to be primarily dispersed, then adding pretreated glass fiber and the rest 1/3 composite reinforcing filler, and mixing for 5-8 minutes until the temperature reaches 105-115 ℃; s4, final mixing and vulcanizing, namely transferring the two-stage rubber compound to an open mill, controlling the roller temperature to be 50-60 ℃, sequentially adding a vulcanizing agent, a composite vulcanization accelerator, pigment and an ultraviolet absorbent, carrying out thin pass for 6-8 times, and packaging by a triangular bag for 4-6 times to obtain final rubber compound; S5, compression molding and post-vulcanization, namely filling the final rubber into a preheated special mold for a starting zone, carrying out compression molding vulcanization for 18-25 minutes at 165-175 ℃ and 10-15MPa, and carrying out post-vulcanization in a baking oven at 100-110 ℃ for 2-4 hours after demolding.
  7. 7. The method of claim 6, wherein the modified material is sized by a pre-forming process and is adhered to the runway body structure with a structural adhesive.

Description

Modified material for rubber runway starting area and preparation method thereof Technical Field The invention belongs to the field of rubber runway materials, and particularly relates to a modified material for a starting area of a rubber runway and a preparation method thereof. Background The plastic track, which is used as the standard configuration of the modern sports field, is the first choice ground material for international athletic events and campus sports fields of all levels since the beginning of the 20 th century because of the advantages of excellent buffering performance, stable physical characteristics, good skid resistance, beautiful color and the like, and rapidly replaces the traditional coal cinder and sand runway. The core value of the sports interface is that an all-weather and high-performance sports interface which can exert the competitive level to the maximum extent and effectively reduce sports injury is provided for athletes. A typical plastic track system is a multi-layer composite structure, generally consisting of a base layer, an elastic buffer layer, a bonding layer and an anti-skid wear-resistant surface layer, and the performance of the system is directly dependent on the chemical composition and the technological level of the materials of each layer. At present, the most widely applied material systems in plastic runway surface layers and elastic layers in the industry are mainly based on the following categories: 1. the runway formed by the Polyurethane (PU) base elastomer system has good integrity, excellent elasticity and strong designability, but has higher cost and is sensitive to the purity of raw materials and the construction environment (temperature and humidity). If a TDI system is used, there may be a risk of free monomer release, raising environmental and health concerns. 2. The prefabricated EPDM coiled material is a finished product prepared by high-temperature vulcanization in a factory, has stable performance, but is complex to install and high in joint treatment requirement. More commonly, EPDM particles and polyurethane adhesive are mixed and constructed on site to form a colorful and wear-resistant surface layer. However, pure EPDM particles are relatively hard and generally have cushioning properties that often require incorporation with an elastomeric layer. 3. The thermoplastic elastomer (such as SBS) and waste rubber recycling system has the advantages that the recycled rubber powder is complex in composition and contains various ageing products, metal impurities and uncertainty additives, and the molecular chains of the recycled rubber powder are broken and oxidized to different degrees, so that the mechanical strength, the elastic recovery rate and the fatigue resistance of the recycled rubber powder are obviously lower than those of the virgin rubber. The conventional material system can meet the requirements in the conventional use area, but when the conventional material system is applied to a special function area of a sports ground, particularly a starting area, the inherent material defects are greatly amplified, so that the area becomes the weakest and first-failure link in the whole runway system. The starting area is not evenly distributed static load, but rather is extremely dynamic, localized impact-fatigue composite load. When the athlete starts running, the starting device generates a great backward pedaling force on the surface of the runway, and the force reaches a peak value instantly, so that strong shearing stress and compression stress concentration are formed. Some attempts have been made in the industry to increase the thickness of the facing in this area, to use EPDM particles of higher hardness, or to use polyurethane-rubber composite castings, for the specific failure mode of the starting area. However, these methods are mostly "variable" improvements, i.e., by increasing the amount of material or sacrificing a portion of the elasticity in exchange for temporary wear resistance, and do not achieve a breakthrough in the reinforcing and toughening mechanisms of the material nature. On the premise of not obviously damaging the elasticity and the buffering function required by the runway, the impact resistance, the tearing resistance and the fatigue resistance of a local area of the runway are greatly improved, and the runway is a key problem which exists for a long time and needs to be solved in the plastic runway material technology. Based on the modified material, the invention provides a modified material for a rubber runway starting area and a preparation method thereof. Disclosure of Invention Aiming at the technical problems in the prior art, the invention provides a modified material for a starting area of a rubber runway and a preparation method thereof, and overcomes the defects in the prior art. The runway material is modified by the glass fiber, and the glass fiber is pretreated, so that the impact resistance, the