化工板块品种集体大涨，持续性如何？

Core Viewpoint - The chemical sector experienced a collective rise, driven primarily by substantial progress in US-China trade negotiations, which exceeded market expectations [2] Group 1: Chemical Sector Performance - The chemical sector saw significant increases, with styrene leading the way with a limit-up of 5.99%, followed by butadiene rubber at 5.85%, PX at 2.82%, and PP at only 1.29% [1] - Styrene's price increase was supported by a favorable supply-demand situation, with port inventory decreasing to 56,700 tons, which is 11.82% lower than the same period last year [2] - Butadiene rubber's price surge was influenced by macroeconomic improvements and supply disruptions from a factory's equipment failure, leading to a spike in raw material prices [3] Group 2: Supply and Demand Dynamics - PX faced production cuts due to compressed margins, while downstream PTA processing fees improved, delaying some maintenance schedules and leading to increased production [3] - Polypropylene's performance was hindered by significant inventory accumulation and weakened supply-demand dynamics, limiting its rebound potential [4] Group 3: Future Outlook for the Chemical Sector - Despite the short-term strength in the chemical sector, there are concerns about the sustainability of these gains due to potential OPEC+ production increases and limited fundamental support for most chemical products [5] - Styrene's price increase may face challenges from high downstream inventory levels and weak supply-demand conditions for pure benzene, limiting its rebound potential [5] - The easing of US-China tariff issues may lead to a temporary inventory replenishment in the polyester sector, but seasonal demand weaknesses and production pressures remain [5]