胎面胶在-20～20℃范围内的tanδ值是多年来评价其抗湿滑性能的重要理论依据，tanδ值大，抗湿滑性能高。超细全硫化粉末橡胶（UFPR）是一种玻璃化转变温度在-20～20℃范围的可达纳米级辐射硫化橡胶粒子。申请人发现，极性超细全硫化粉末丁腈橡胶（UFPNBR）能够提高胎面胶的抗湿滑性、非极性超细全硫化粉末丁苯橡胶（UFPSBR）显著提高胎面胶的抗干滑性。本课题优化设计UFPR粒子改性胎面胶的tanδ-T曲线，从胎面与路面之间的粘附力、胎面胶滞后损失力等方面，研究UFPR粒子的极性、动态粘弹性、交联结构、硬度、粒径、热活化和胎面微观构造等因素对胎面胶抗干滑、抗湿滑性能的影响机制。一方面，结合弹流润滑理论，丰富胎面胶的抗湿滑性理论，另一方面，应用动态粘弹性可控的硬质有机粒子，探索胎面胶的动态粘弹性与抗干滑性之间的关联性。为发展胎面胶的安全行驶性能评价理论和高性能胎面胶的制备提供新的研究思路。

Generally, the tan δ value of tread compound in the range from -20 to 20 ℃ is an important parameter to evaluate the performance of the wet skid resistance, the higher the tan δ value, the higher the wet skid resistance of the tread compound, which has been widely used in rubber researches for many years. The ultrafine fully-vulcanized powder rubber (UFPR) is a novel irradiation vulcanized rubber particle prepared using the industrial technologies of irradiating rubber latex and spray drying. It is worth noting that the sizes of the UFPR particles are close to nanometer scale, and the glass transition temperature (Tg) of the UFPR particles are in the temperature range from -20 to 20 ℃. Our research results shows that the ultrafine fully-vulcanized powder nitrile butadiene rubber (UFPNBR) increases the wet skid resistance of tread compound while the ultrafine fully-vulcanized powder styrene butadiene rubber (UFPSBR) increasing the dry skid resistance of the tread compound in the case of rolling resistance not increasing. In this proposal, we will optimize the UFPR particles to modify the tread compound. On one hand, the ideal tanδ-temperature curves will be designed for the UFPR particles modified tread compound with high wet skid resistance. On the other hand, the effects of UFPR particles on the wet skid resistance and the dry skid resistance of the tread compound will be studied in three areas, the adhesive force occured between tread surface and the pavement surface, the hysteresis loss of tread compound, and the microtexture of tread surface. Especially, we will study the effects of the UFPR particles on the mechanism of wet skid resistance and dry skid resistance of tread compound using followed performance of the UFPR particles in detail, the chemical structure, the crosslink density, the dynamic viscoelasticity, polarity, size, thermal activation, UFPR loading and dispersion of UFPR particlesi in tread compound, etc. There are three research purposes in this proposal. The first research purpose is to develop the evaluating theory of the wet skid resistance of tread compound using the polar UFPNRB particles. The second one is try to build a relation between the dynamic viscoelasticity and the dry skid resistance of tread compound. The third one is to supply some research data for preparing the advanced tread compound with high wet skid resistance and dry skid resistance.