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[Chemical Knowledge]：What are the upstream raw materials for polyester polyols? What do the downstream products contain?

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Polyester polyols have an important position in the field of chemical production raw materials, and their upstream and downstream related products are extensive. This article will detail the upstream and downstream related products of polyester polyols, including upstream raw materials, downstream application products, and by-products in the production process.

1. upstream raw material

1. Polyacid: the synthesis of polyester polyol requires polyacid as raw material, commonly used polyacid including adipic acid, terephthalic acid and so on. These polybasic acids are reacted with polyhydric alcohols by an esterification reaction to form polyester polyols.
2. Polyol: Polyol is another important raw material of polyester polyol. Commonly used polyols include ethylene glycol, propylene glycol, etc. The choice of polyol will affect the properties and performance of the polyester polyol.

2. downstream application products

1. Polyurethane foam: Polyester polyol is an important raw material for the production of polyurethane foam. After mixing with isocyanate and other raw materials, polymerization occurs to generate polyurethane foam. Polyurethane foam has excellent thermal insulation and sound insulation properties, and is widely used in construction, home appliances and other fields.
2. Coatings: Polyester polyols can be used to produce coatings that provide good weather resistance, chemical resistance and decoration. Coatings can be used in construction, automobiles, ships and other fields.
3. Adhesives: Polyester polyols can be used as raw materials for adhesives for the production of various adhesives, such as polyurethane adhesives, polyester adhesives, etc. These adhesives have excellent bonding properties and weather resistance, and are widely used in building materials, packaging and other fields.
4. Elastomers: Polyester polyols can be used to produce polyurethane elastomers, which have good wear resistance, impact resistance and resilience, and are widely used in tires, seals and other fields.

3. by-products in the production process

1. Oligomers: In the production process of polyester polyols, some oligomers may be produced. These oligomers can be used as raw materials for other chemical products or used to produce some special properties of polymers.
2. Wastewater: A certain amount of wastewater will be produced during the production process, which needs to be treated to meet environmental protection standards and discharged. Wastewater treatment usually uses physical, chemical and biological methods to reduce environmental pollution.

In summary, polyester polyols have a wide range of upstream and downstream related products, involving a number of fields. In the production process, it is necessary to pay attention to environmental protection and resource utilization issues, improve production efficiency and product quality, and meet the growing market demand. At the same time, with the continuous development of science and technology, the production process and downstream application products of polyester polyols are constantly updated and improved, injecting new vitality into the development of chemical production raw materials.

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