.不饱和聚酯树脂（UPR）：顺酐与二元醇缩聚脱水后加入交联剂苯乙烯制得。这种树脂外观为透明淡黄或褐色粘稠液体，具有耐热、耐腐蚀、绝缘、耐磨和强度高等特点。在建筑、航空、汽车、电子等制造领域得到广泛应用。其中，增强型UPR（FRP）主要应用在建筑活动房屋、波形瓦、门窗、落水管等领域，也用于制造汽车零件、保险杠，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：顺酐是制造染料的重要原料，广泛应用于油漆、涂料、固化剂等多个行业。顺酐可以直接与酰胺、芳香胺等化合物反应，得到多种新型染料和颜料，具有高色牢度、彩度饱和度好、不易褪色等特点，广泛应用于纺织、印刷、油漆等领域。

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.固化剂：固化剂是顺酐的另一个重要下游产品，广泛应用于涂料和UPR等多个行业。

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

4.复合材料：一种由不同材料组成的多层结构，顺酐在其中发挥着关键作用，这些复合材料在航空、建筑和汽车等多个行业有广泛应用。

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.医药中间体：顺酐的一个重要衍生物是马来酸脂，它既可用作润滑剂，也可用作抗真菌药物、止痛药、安眠药等医药中间体。

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：顺酐还可以用于制造树脂，这种树脂在混凝土和水泥制品中作为添加剂使用，有助于推动事业的发展。

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，顺酐的下游产品还包括润滑油添加剂、水处理剂、松香、濮阳惠成公司的功能材料中间体（部分产品应用于OLED领域）等，显示了顺酐在多个领域的广泛应用性。

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.