The impact of TPU raw materials on product performance (Part 1) - Guangyuan Ruifeng New Materials

Category: TPU (popular science, no product)

Release Time: 2020-06-24

Summary: There are three main types of TPU synthesis: polyol oligomers (diols), diisocyanates, and small molecule chain extenders. In addition, additives are sometimes added to improve reaction speed, processing performance, and reduce costs.

There are three main types of TPU synthesis: oligomeric polyols (diols), diisocyanates, and small molecule chain extenders. In addition, additives are sometimes added to improve reaction speed, processing performance, and reduce costs. (TPU crosslinking agent manufacturer)

1. Influence of oligomeric polyols on TPU properties (TPU crosslinking agent manufacturer)

The oligomeric polyol raw materials used in TPU include polyester polyols, polyether polyols, and polyolefin polyols. The content of high molecular weight diols in TPU is usually about 50%-80%, so it has a great influence on the properties of TPU. The main indicators of polyols to be considered include hydroxyl value, acid value, color, viscosity, water content, molecular weight distribution, and reactivity with isocyanates. It is important to note that the regularity of the polyol molecular chain has a great impact on the physical properties of TPU. If the polyol is uniform and free of substituents, it is conducive to the aggregation of high molecular weight diols, thus having higher physical properties; conversely, it is conducive to the formation of amorphous TPU, resulting in lower physical properties of the synthesized TPU. Therefore, it is necessary to consider the quality of high molecular weight diol products during the production research process. (TPU crosslinking agent manufacturer)

2.

Different oligomeric polyols have different structures, resulting in different polarities of the soft segments of the polyurethane elastomer molecules, and thus different soft and hard segment aggregation structures. The regularity of the oligomer chain structure has a great influence on the arrangement of the soft segment molecular chains, the crystallinity of the oligomer itself, and the properties of the obtained polyurethane elastomer. The regularity of the soft segment structure has a great influence on the crystallinity and strength of the polyurethane. (TPU crosslinking agent manufacturer)

Polyester polyols contain a large number of polar ester groups in their molecules, which can form strong intramolecular hydrogen bonds, so polyester TPUs have higher strength, wear resistance, and oil resistance; polyesters are easily attacked by water molecules and break, and the acid generated by hydrolysis can further catalyze the hydrolysis of the polyester, so their hydrolysis resistance is worse than that of polyether TPUs. In polyether polyols, the carbon atoms adjacent to the ether oxygen atoms are easily oxidized by air and are also easily attacked by ultraviolet light, so polyether TPUs have lower thermal stability and resistance to photooxidation; ether bonds are not easily hydrolyzed and are more flexible, so the resulting TPUs have better hydrolysis stability, weather resistance, low-temperature flexibility, and mildew resistance. TPUs synthesized using polyolefin polyols have excellent hydrolysis resistance, electrical insulation, low-temperature flexibility, airtightness, and water tightness. TPUs made from low-functionality polyacrylate polyols have good water resistance and UV resistance. Refined castor oil is a plant oil polyol containing an alkene bond, and the resulting TPU is hydrolysis-resistant and low-cost, but not high in strength. TPUs synthesized from different high molecular weight diols have different properties, so when designing the formula, the appropriate type of high molecular weight diol should be selected first according to the product properties. (TPU crosslinking agent manufacturer)

Guangan Ruifeng New Materials Co., Ltd., a TPU crosslinking agent manufacturer, has mature production processes to meet your needs.

Keywords: The impact of TPU raw materials on product performance (Part 1) - Guangyuan Ruifeng New Materials

Related Solutions

Previous: The impact of TPU raw materials on product performance (Part 2) - Guangyuan Ruifeng New Materials

Next: TPU application in waterproof zippers - Guangyuan Ruifeng New Materials

Guangan///Guangyuan,Guoyuan///Guangyuan,Ganguan///Guangyuan

Sorry，当前栏目暂无内容!

您可以查看其他栏目或返回 首页

Sorry，The current column has no content!

You can view other columns or return Home