.不飽和聚酯樹脂（UPR）：順酐與二元醇縮聚脫水后加入交聯劑苯乙烯制得。這種樹脂外觀為透明淡黃或褐色粘稠液體，具有耐熱、耐腐蝕、絕緣、耐磨和強度高等特點。在建筑、航空、汽車、電子等制造領域得到廣泛應用。其中，增強型UPR（FRP）主要應用在建筑活動房屋、波形瓦、門窗、落水管等領域，也用于制造汽車零件、保險杠，以及中小型船舶的船身和零部件。

Unsaturated polyester resin (UPR): obtained by condensation dehydration of maleic anhydride and diols, followed by the addition of crosslinking agent styrene. This resin has a transparent to light yellow or brown viscous liquid appearance, and has the characteristics of heat resistance, corrosion resistance, insulation, wear resistance, and high strength. Widely used in manufacturing fields such as construction, aviation, automotive, and electronics. Among them, enhanced UPR (FRP) is mainly used in the fields of construction movable houses, corrugated tiles, doors and windows, downspouts, etc. It is also used to manufacture automotive parts, bumpers, as well as the hull and components of small and medium-sized ships.

2.染料：順酐是制造染料的重要原料，廣泛應用于油漆、涂料、固化劑等多個行業。順酐可以直接與酰胺、芳香胺等化合物反應，得到多種新型染料和顏料，具有高色牢度、彩度飽和度好、不易褪色等特點，廣泛應用于紡織、印刷、油漆等領域。

2. Dyes: Maleic anhydride is an important raw material for manufacturing dyes, widely used in various industries such as paint, coatings, curing agents, etc. Maleic anhydride can directly react with compounds such as amides and aromatic amines to obtain various new dyes and pigments, which have high color fastness, good color saturation, and are not easy to fade. They are widely used in fields such as textiles, printing, and paint.

3.固化劑：固化劑是順酐的另一個重要下游產品，廣泛應用于涂料和UPR等多個行業。

3. Curing agent: Curing agent is another important downstream product of maleic anhydride, widely used in multiple industries such as coatings and UPR.

4.復合材料：一種由不同材料組成的多層結構，順酐在其中發揮著關鍵作用，這些復合材料在航空、建筑和汽車等多個行業有廣泛應用。

4. Composite materials: A multi-layer structure composed of different materials, in which maleic anhydride plays a key role. These composite materials are widely used in various industries such as aviation, construction, and automotive.

5.醫藥中間體：順酐的一個重要衍生物是馬來酸脂，它既可用作潤滑劑，也可用作抗真菌藥物、止痛藥、安眠藥等醫藥中間體。

5. Medical intermediates: An important derivative of maleic anhydride is maleic acid ester, which can be used as a lubricant, as well as a pharmaceutical intermediate for antifungal drugs, analgesics, sleeping pills, and other medications.

6.材料：順酐還可以用于制造樹脂，這種樹脂在混凝土和水泥制品中作為添加劑使用，有助于推動事業的發展。

6. Environmentally friendly materials: Maleic anhydride can also be used to manufacture environmentally friendly resins, which are used as additives in concrete and cement products, helping to promote the development of environmental protection.

此外，順酐的下游產品還包括潤滑油添加劑、水處理劑、松香、濮陽惠成公司的功能材料中間體（部分產品應用于OLED領域）等，顯示了順酐在多個領域的廣泛應用性。

In addition, downstream products of maleic anhydride also include lubricant additives, water treatment agents, rosin, functional material intermediates produced by Puyang Huicheng Company (some products are used in the OLED field), etc., demonstrating the wide application of maleic anhydride in multiple fields.