Paper durability is a critical attribute for a vast array of products, from everyday tissues to high-strength industrial papers. A significant factor in achieving this durability, particularly in wet conditions, is the application of wet strength agents. At the heart of producing these vital agents is the WSR intermediate, a specialized chemical compound that underpins the advanced capabilities of modern paper.

The WSR intermediate is a polyamide aqueous solution, meticulously synthesized through a chemical process that combines dibasic acid and polyamine. This condensation reaction, conducted under specific temperature and catalytic conditions, results in a stable, water-based polymer. Its primary utility in the paper industry is as a precursor for polyamide-epichlorohydrin (PAE) polymers. These PAE polymers are the active ingredients in most high-performance wet strength additives. The process of converting the WSR intermediate into a functional wet strength agent typically involves reacting it with epichlorohydrin, followed by careful control of reaction parameters like temperature and pH to achieve the desired molecular weight and properties of the final polymer.


As a leading supplier and manufacturer in China, NINGBO INNO PHARMCHEM CO.,LTD. provides a high-quality WSR intermediate essential for paper chemical producers. The intermediate's characteristics, such as its light yellow transparent liquid appearance, a solid content of no less than 40%, and a pH range of 7-10, ensure its suitability for downstream applications. Understanding the price and sourcing options for WSR intermediate is crucial for companies aiming to optimize their production costs while maintaining product quality. By sourcing from a reputable manufacturer like NINGBO INNO PHARMCHEM CO.,LTD., businesses can be assured of consistent quality and reliable supply, which directly impacts the final paper product's durability.


The benefits derived from using a high-grade WSR intermediate are substantial. It enables the production of wet strength agents that offer superior humidification strength effects, meaning paper retains its mechanical properties even when thoroughly wet. Moreover, the resulting agents exhibit excellent storage stability, ensuring that their performance does not degrade over time. This enhanced durability is invaluable for paper products that may encounter moisture during their lifecycle, such as labels, packaging, and certain absorbent hygiene products. The efficiency gained in the synthesis process, starting with a well-prepared intermediate, also contributes to overall manufacturing productivity.


The application of WSR intermediate, therefore, is intrinsically linked to the advancement of paper technology. It empowers paper manufacturers to create products that meet demanding performance criteria. NINGBO INNO PHARMCHEM CO.,LTD. plays a vital role in this ecosystem by supplying this critical chemical building block. For any paper chemical company or paper mill seeking to improve product performance and explore new market opportunities, understanding and utilizing the potential of WSR intermediate, sourced from a trusted partner, is a strategic imperative for enhancing paper durability.