求翻译：聚氨酯涂料生产主体设计是采用干性油与异氰酸酯，溶剂法制备制备聚氨酯油，对比国内生产厂家的设计，以聚氨酯的生产工艺过程为主线逐步计算。是什么意思？

Polyurethane coatings as the main production design is the use of a drying oil with the isocyanate, solvent prepared by the preparation of polyurethane oil, compared to the design of domestic manufacturers, the main line of polyurethane production process step by step calculation.

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Polyurethane coating production design is the use of drying oil and isocyanates, preparation of polyurethane solvent oil, comparing design of domestic manufacturers, in polyurethane production process as the main line of the progressive terms.