The application of catalyst in rubber runway plastic runway
Plastic Runway
Plastic runway, also known as all-weather athletic track, is composed of polyurethane prepolymer, mixed polyether, waste tire rubber, EPDM rubber granules or PU granules, pigments, additives and fillers. The plastic runway has the characteristics of good flatness, high compressive strength, appropriate hardness and elasticity, and stable physical properties, which is conducive to the athletes’ speed and technology, effectively improving the sports performance and reducing the rate of fall injury. Plastic runway is composed of polyurethane rubber and other materials, with certain elasticity and color, with certain anti-UV ability and aging resistance is internationally recognized as a good all-weather outdoor sports ground material.
Is the plastic runway toxic?
Domestic plastic runway is generally made of polyurethane, supplemented by pigments and additives. The quality of polyurethane, generally will not volatilize harmful substances. Polyurethane is a chain-like molecule polymerized with two monomers: polyether polyol and diisocyanate. If these two monomers are completely polymerized, polyurethane itself is not harmful. The key is that poor quality polyurethane has more residues of these two monomers that are not fully polymerized, and one of the sources of harmful effects is these two monomers.
How do you test for “toxic”? More
Conventional testing methods generally include: sunlight exposure test method for vulcanized rubber under glass, determination of the content of rubber and rubber products components, thermogravimetric analysis, etc. For the general public, the simple way is to smell by nose. If there is an odor, it is likely to be caused by the evaporation of harmful residues of the plastic runway.
Why are there more sandy runways in Japanese and Korean primary and secondary schools? More
First of all, most of the schools in Japan and Korea are private schools, and it costs a lot of money and material resources to lay the plastic runway, so the school authorities retain the sandy ground in order to make the interests bigger; secondly, once the poor quality plastic runway is encountered, there will be toxic gas volatilization, and for health reasons, most of the Japanese and Korean primary and secondary schools have not built the plastic runway.
Content finishing bug catching action
Chinese name plastic runway foreign name tartan type breathable hybrid composite all-plastic main materials polyurethane prepolymer, mixed polyether, etc. Features high compressive strength, hardness elasticity appropriate scope of application indoor, outdoor and other sports/activity venues
Contents
1Construction standard
2Runway characteristics
3Price estimation
4Maintenance management
5Main components
6Scope of application
7Main classification
8Main materials
9Maintenance knowledge
10Standard questioning
11Related Laws
12National standards
13Related Reports
Construction Standards
The standard runway is 400 meters in length and should consist of two parallel straight tracks and two curves of equal radius. Except for grass runways, the inner side of the runway should be divided by a protruding edge made of suitable material. The edge should be about 5cm high and at least 5cm wide.
2. The length of the runway should be measured at 30 cm beyond the outer edge of the inner edge. If there is no protruding edge, it should be measured at 20 cm beyond the outer edge of the marker. Note: The IAAF Handbook of Athletics Facilities contains all technical information on runway construction, design and marking. This rule gives the basic principles that should be followed.
3. For all track and field events of 400 meters and below, each athlete shall occupy a divided lane with a width of 1.22 meters for the smallest lane and 1.25 meters for the largest lane and a width of 5 cm for the divided line, and all the divided lanes shall be of the same width. The length of the divided lanes shall be measured as specified in paragraph 2 above, and the length of the other divided lanes shall be measured 20 cm beyond the outer edge of the inner divided lane line.
Note: The width of the divided lane shall include the right side divided lane line
Plastic runway construction on asphalt or cement foundation, the foundation practice is roughly the same as road construction. Foundation surface flatness requirements are high to ensure consistent thickness of the plastic surface layer and uniform elasticity, and the quality requirements for the foundation are as follows.
Slope: horizontal <1% (curved road 8‰, straight road 5‰, semi-circular area 5‰), vertical <1‰, jump height area <0.4%, the surface should be flat and smooth, smooth drainage.
Levelness: the levelness pass rate is above 95%, 3m straightedge error 3mm.
Positioning: For accurate construction and line drawing, four semi-circular tangent points and two circle centers of the runway site should be marked with firm and distinctive markers.
Drainage: The drainage system must discharge the water after two hours of heavy rain. In the frozen area, it is good to add a layer of geotextile buffer layer between asphalt layer and gravel layer. The foundation along the drainage trench should be made special waterproof treatment.
Strength and stability: The foundation should have a certain strength and stability, uniform and solid surface, no cracks, no rotten edges, straight and smooth joints. The bedding layer is compacted with a degree of density greater than 95%, and there are no significant wheel tracks, loose floating soil, waves, etc. after being pressed by medium-sized mills.
Runway features
Color: special polyurethane granules, soft surface color, granular surface, to prevent the reflection of dazzling and harsh sunlight, beautiful and durable, and can be used with multiple colors.
Economy: convenient maintenance, saving the cost of governance.
Safety: It can prevent sports injuries caused by falls.
Adhesiveness: special construction treatment, strong adhesion, can press the moisture rise, no bubbles, peeling and other phenomena.
Flatness: construction using self-leveling materials, the surface is flat and can meet the requirements of particularly flat playing fields.
Impact resistance: With strong elastic layer and buffer layer, it can absorb strong impact and the surface will not be damaged.
Spike resistance: In the 100m starting point, which is frequently used by large forces, it will not be damaged by spike shoes or starting frames.
Abrasion shrinkage resistance: will not be unable to restore the elasticity due to the heavy pressure of track and field equipment.
Wear resistance: wear resistance is less than 2.5%, to meet the needs of schools at all levels for a long time, high frequency of use.
Impact absorption: moderate absorption of foot impact to reduce sports injuries, long-term training and competition are appropriate.
Price estimation
1、
Plastic runway
Plastic runway
The price of mixed plastic runway is generally around 190 square meters
2, cement foundation cost about 120 yuan (asphalt foundation to be more expensive about 200), cement concrete foundation C20 thickness 15 cm, the foundation in order for the original soil tamping – Sanqi gray soil 20 cm – gravel stabilization layer 15 cm – C20 concrete; asphalt concrete foundation 7-10 cm AC-8, AC-10 asphalt aggregate, the foundation in order for the original soil tamping – Sanqi gray soil 20 cm – inorganic material stabilization layer 15 cm – asphalt concrete. Inorganic material stabilization layer 15 cm – asphalt concrete.
Maintenance management
1, after the completion of the plastic runway paving, must be maintained 7-10 days after the use.
2, plastic runway in the conditions of certain drainage equipment, adapt to all-weather use. Plastic runway is used for sports practice, competition and students’ stillness and fitness training, not for other purposes.
3, to prevent the purification of harmful materials, often maintain clean, to prevent violent mechanical impact and friction, the runway is not allowed to drive vehicles, pile up heavy and sharp objects (except for standard running shoes). Sports must wear special nail shoes, nail length individual does not exceed 7 mm, jump shoes individual does not exceed 11 mm. If the nail shoes with longer nails, it is not allowed to be used on the plastic track.
4、Prevent temporary loading.
5、Prevent smoke and fire and isolate the heat source, prevent contact with organic solvents, chemicals, cigarette butts and other fires, purification materials, etc.
6、It should be frequently cleaned by water spraying, and a large amount of residual water on the rubber surface can be removed by dry cloth after cleaning. Oil stained with 10% ammonia or detergent, laundry detergent scrub clean.
Main components
The main components of plastic runway are acrylic acid and high quality resin, the material is similar to the convenience bag for food, which meets the requirement of environmental protection surface material. The raw materials of the plastic runway are certified by the National Plastics Industry Association, which is non-toxic and harmless to the environment and human body. It has the characteristics of anti-UV, anti-abrasion, anti-burst, anti-aging, long life, easy maintenance, low maintenance cost, etc.
Scope of application
Used for kindergarten all levels and types of schools and professional stadium, athletic field runway, semi-circular area, auxiliary
Plastic runway
Plastic runway
Auxiliary area, national fitness path, indoor gymnasium training track, playground road pavement, indoor and outdoor track, tennis, basketball, volleyball, badminton, handball and other venues, parks, residential areas and other activity venues.
Main classification
Generally speaking, the runway is usually referred to schools of all levels and professional stadiums.
The standard runway is 400 meters in perimeter and 36.5 meters in radius (there are also 36 meters and 37.898 meters), and the non-standard runway is the radius and perimeter of the playground according to the shape and size of the playground area, and the common ones are 200 meters and 300 meters in perimeter.
And plastic runway according to its construction structure, materials can be divided into.
Prefabricated plastic runway and all-plastic plastic runway are the common types of professional athletic fields because of their incomparable performance, but their high prices are not affordable to the general schools and universities.
Mixed plastic runway and composite plastic runway performance between all-plastic and breathable, the price is slightly lower than all-plastic and other plastic runway, but it is also higher than breathable, with higher requirements for foundation.
The performance of breathable plastic runway can fully meet the indicators of GB/14833-93, and is breathable.
Permeable, short construction period, easy to maintain and renovate, high cost performance, also is the first choice of large, medium and small schools.
EPDM plastic runway is mainly used in elementary school or kindergartens and other non-standard runways.
All-plastic plastic runway
Product characteristics.
The main material is two-component polyurethane, and the base layer is natural rubber and artificial rubber, mixed with mineral filler, stabilizer and coloring material, which is hardened at 280-300℃ with sulfur. Combining sports science and material science, it can fully meet and reflect the professional requirements of athletes and participants for the runway.
Solvent-free plastic runway
Description of solvent-free plastic runway process.
Solvent-free plastic runway is an environmentally friendly plastic runway made of non-toxic sports surface material, which belongs to the diphenylmethane diisocyanate (MDI) system. MDI synthetic surface material is solvent-free, odorless and non-polluting water-based polyurethane runway material. It is an environmentally friendly sports pavement material that eliminates the toxic TDI system polyurethane runway material, with advanced performance, high-tech content, safety, renewable, suitable for use under various conditions and less harmful to human body. Its specific features are as follows.
1: No TDI, no benzene, toluene, xylene and other toxic volatile solvents, no plasticizers, no heavy metals and other harmful additives, no volatile odor, friendly to human body and the environment, fully in line with environmental requirements.
2: convenient construction, strong adhesion, high laying efficiency, fast curing speed, adapt to different construction requirements such as spraying or mechanical paving, no odor during the laying process, does not affect the normal teaching activities of the school and the normal life of the surrounding residents.
3: No odor and no emission of any harmful substances after it is put into use, reducing pollution to the environment.
Prefabricated
Prefabricated runway paving process description.
With safety, environmental protection, excellent weather resistance, economic
durable, multi-color effect. Easy to install, just use the special adhesive provided by us, under a small amount of human and mechanical conditions, you can pave the runway coil on a dense foundation, and the runway can be put into normal use after 24 hours of complete installation. And it is maintenance-free.
Mixed type
Hybrid runway paving process description.
The plastic runway paving construction process is to use the three-step construction method for paving. First of all, add the right amount of rubber particles in the rubber solution, pave the bottom rubber thickness of 8 mm, wait for its curing, then pave the rubber solution with a thickness of 2 mm on top, scatter the red particles evenly by hand, recover the excess rubber particles, and then spray a layer of rubber solution on top.
Process sketch.
Clean the site → bottom glue ingredients → mixing and stirring → paving → defoaming → curing → surface glue ingredients → mixing and stirring → paving → defoaming → scattering particles → recycling glue particles → rolling glue → measuring and drawing lines → detecting dotted lines → completion
2、Paving process description.
(1) First check the levelness of the foundation layer and level the concave and convex parts (such as cement concrete foundation needs acid washing).
(2) Base rubber laying.
Before laying the base rubber first clean the foundation base, prepare the tools for construction.
a) Measure the location of the construction line and put the construction line according to the process requirements.
b) laying from one side of the site, according to the width of the site at once scraping rubber.
c) Scrape the glue at an even speed, and make up the glue or scrape flat on the bottom, depressions and bulges in time.
d) After the glue is formed, the whole field is checked to ensure the thickness of the surface glue paving.
(3) Paving of surface rubber.
a) Try to shorten the interval time of each barrel of glue when scraping, so that the speed of forming glue is even and consistent.
b) Always observe the thickness of the glue surface.
c) Scrape the surface glue, before the surface glue is cured, scatter the red granules, and after it is completely cured, sweep the excess surface glue particles clean.
Breathable type
Product characteristics.
1、Meet the national standard. Mechanical paving and mechanical spraying, excellent flatness and no degranulation.
2、Pore space, water permeable, breathable, excellent elasticity, no blistering phenomenon.
3, can be used all-weather, strong wear resistance, good weather resistance, good compression resistance, good impact resistance, strong and durable.
4、The price is economic.
Construction steps.
1, site cleaning, concrete coated with primer, asphalt surface scraping
2, mechanical laying of the bottom layer 11mm thick, single-component adhesive + rubber particles
3、Machine spraying surface layer 1.5mm thick, single-component adhesive + EPDM particles, and then spraying in the opposite direction once.
4、Runway measurement, sample placement and marking line.
5、Site cleaning and retreat.
Construction technical indexes.
Specific gravity marked value ±0.10
Hardness (HS) 45～65
Tensile strength（kgf/c㎡（Mpa）25（2.45）or more
Tear strength（kgf/cm(N/mm)10（98）above
Elongation %250 or more
Compression permanent deformation rate%35 or more
Abrasion resistance %2.5 or less
Hardness (HS) Change of original hardness value ±5
Composite type
By combining the production of hybrid surface layer and breathable bottom layer, it can shorten the construction period and reduce the cost by not shedding particles.
Composite runway picture
Composite runway picture
Self-knotted
One base layer: polyurethane mixture with black rubber granules.
Second middle layer: self-knotted clear slurry, paving to form a closed-hole micro-bubble sandwich, whose elasticity, hardness and friction can not only slow down the impact of the impact on the joints of human legs when the feet land, but also enable the human body to obtain continuous forward kinetic energy. It meets the standard requirement of 35%~50% of shock absorption rate newly promulgated by IAAF.
Picture of self-knotted runway
Picture of self-knotted runway
Three surface layers: self-knotted slurry, which is pure glue (slurry) mixed with diamond powder and accelerator, sprayed by professional machine, and after several hours reaction, it naturally forms pure polyurethane material slurry and anti-skid surface layer by itself. This process not only can overcome the characteristics of polyurethane material self-leveling, but also can retain the weathering and aging resistance of polyurethane material, and at the same time overcome the general problem of polyurethane runway easy to drop particles. Wear-resistant, uniform surface particles, even force, clear and full delineation, neat and beautiful, environmentally friendly products.
Main materials
Two-component polyurethane slurry – mainly used for
