Guide for spraying polyurea on tennis court

1. summary
the tennis court require high rebound capability. In addition, good elasticity of ground can increase the competitive level and reduce people's tiredness. As the tennis court are usually outdoors, the weather resisting property must be very strong. Comparing with the traditional polyurethane tennis court, the spray polyurea tennis court, adopting the spray polyurea elastomer material of our company, has more excellent weather resisting property, elasticity and effective consrtucting means.

2. Features of products
1) with special elasticity and rebound force of polyurea elastomers, the athletes may have a better feeling of balls and a higher competitive level, and the tiredness may reduce.
2) excellent weather resisting property
3) polyurea elastomer: 100% solid, without impregnant and padding, no appearance of crack and pulverization, a much longer life comparing with the general coating polyurethane tennis court materials which have impregnant and a large amount of padding, and may crack or pulverize in sunshine, rain, or when the tempreture changes
4) strong adhesive attraction with the ground, meanwhile, can protect the ground from cracking because of shrink or expand
5) not sensitive on the change of tempreture
6) Environment protection products without impregnant and pollution. In addition, it will not contract as the impregnant volatilizes after rigidification.
7) polyurea elastomers: two-component reaction, rapid solidification.
8) polyurea elastomers adopt the special purpose equipment imported from America, the solidification process can finish in 10 seconds, and the ground can be walked on after 30 minutes, which is quite efficient.
For the general tennis court material: coated ny hand, solidify time 12-24 hours, can be walked on only after 5-6 days, may be affected by foreign matters, such as defoliations, insects, etc.

3. Construction means

3.1 treatment for base level
1) whether it is concrete level or bitulith level, please completely examine whether it has level surface and good intensity. In addition, the gradient of base level should meet the requirements of drainage.
2) in order to increase the adhesive attraction of concrete and elastomers, please level and smooth the concrete surface. Do the next working procedure until the water ratio is below 8%.
3) completely clear away the grease, cement dust and other foreign matters.
4) use steel brush, bush hammer, abrasive blasting etc. to clear away the cement foam, parting agent and firming agent.
5) If there is levelling work, please completely examine and deal with the convex, aging and bulging.
If level the base surface, please
6) clear away the dust with high pressure blower, swab or cotton yarn, it affects the quality of spray polyurea elastomers a lot.
7) when all is done, examine carefully and go to the next procedure until there is no problem.

3.2 Construction of primer
Choose filtering primer rigidifying at normal temperature. The type can be decided acoording to actual condition of the construction base level. The function of primer is to cut off the humidity of base level infiltrate upowards, prevent bulge and desquamation of spray elastomers, further reinforce the base level, improve the cohesional strength between spray elastomers and base level, and prevent appearing pinprick or air vent.
Dried naturally until the water ratio of cement floor is below 8%.
The first coating should be even and a little thick, do not miss any section. The quality may affect the next procedure very much.
Go to the next procedure until the primer is completely dried. Note: whether the primer is completely dried will affect the quality of the next procedures.

3.3 polyurea spray
3.3.1 Calculation of raw materials dosage.
3.3.2 Technological process of construction
first layer: elastomers
second layer: hard wearing layer
Please contact ILSAN Polyurethane (Shanghai) Co., Ltd. to learn more detail technological process.
3.3.3 last treatment
After spraying elastomers, examine carefully to see if any part needs repair or strengthen.
3.3.4 Examine the quality of construction
Start the construction of top coating only if the quality of elastomers is up to standard.
3.4 Construction of top coating
It is better to choose crylic acid-polyurethane skid preventation top coating which can prevent yellow stain of elastomers.
The protective coating should be constructed the next day and it only can be walked on after 24 hours.
3.5 paint labels
Paint labels when it is confirmed that it can be walked on, the detail construction means are available in the manual.
4. Sketch map of construction