The Smart Choice For Low-melting A.I. WDGs — SP-WG21 Drives Quality Upgrades

Aligned with Agricultural Modernization - Solving the Challenges of Low-melting A.I. Formulations

In recent years, the rapid advancement toward agricultural modernization has driven strong demand for pesticide formulations that deliver high efficiency, stability, and ease of application. Low-melting active ingredients-commonly found in certain insecticides and fungicides-have gained increasing attention in WDG development, thanks to their excellent dispersibility and rapid biological performance.

However, these advantages also come with formulation challenges. Low-melting A.I.s are highly sensitive to raw material quality variations, impurity profiles, and storage conditions. Without proper stabilization, this often results in reduced suspension performance, the formation of ″dead granules″ (non-disintegrating particles) that fail to break down in water, and visible deterioration of granule appearance-ultimately limiting product shelf life and market competitiveness.

Achieving long-term storage stability while maintaining efficacy has therefore become a critical technical challenge for formulation developers.

SP-WG21: Ensuring Dispersion Stability from the Very Beginning

Addressing key challenges in the production of low-melting A.I. WDGs, Sinvochem proudly introduces SP-WG21, a naphthalene sulfonate–based dispersant designed specifically for low-melting A.I. WDG formulations.

SP-WG21 contains multiple naphthalenesulfonate units, which impart excellent dispersing and stabilizing properties. Its mechanisms of action can be summarized in four main aspects:

Strong electrostatic stabilization: The sulfonate groups carry a strong negative charge, generating significant electrostatic repulsion on particle surfaces, effectively preventing aggregation.

Efficient wetting and dispersion: SP-WG21 rapidly adsorbs onto the surface of active ingredient particles, significantly reducing the solid–liquid interfacial tension and promoting uniform wetting and dispersion.

High-temperature resistance and anti-melting adhesion: During processing and storage, it minimizes particle stickiness caused by softening of low-melting active ingredients.

Inhibition of particle growth: Through interfacial protection and steric hindrance effects, SP-WG21 suppresses secondary aggregation and crystal growth, maintaining stable particle size.

Based on these mechanisms, SP-WG21 effectively addresses common challenges encountered with low-melting active ingredients in WDG processing and storage, including melting and stickiness, poor dispersion, difficult granulation, low suspension rate, and poor thermal stability, thereby significantly enhancing formulation processability and product stability. The specific advantages are as follows:

1. Premium Raw Material Quality Lays the Foundation for High-End WDGs

SP-WG21 appears as a light-colored, fine, and uniformly distributed powder, free from coarse agglomerates. This inherent material quality allows it to blend quickly and evenly with A.I.s and other formulation components during processing, minimizing defects at the source and ensuring consistent production of high-quality WDGs.

Figure 1. Appearance of a commercial benchmark (left) and SP-WG21 (right)

2. Outstanding Heat Storage Stability for Long-Term Shelf Life

SP-WG21 delivers excellent stability under heat storage conditions. Even after high-temperature aging, key formulation parameters remain stable, effectively preventing the formation of ″dead granules″ or partially disintegrated particles. As a result, product shelf life is significantly extended, enhancing market reliability.

3. Significantly Improved Suspension for Enhanced Efficacy

By optimizing granule dispersion upon contact with water, SP-WG21 markedly improves suspension performance, enabling rapid and uniform dispersion and more complete release of active ingredients.

Proven Excellence in Practical Applications

In the preparation of 50% Pymetrozine WDG via extrusion granulation, SP-WG21 and a commercial benchmark were each applied at a dosage of 5%. The results clearly show that the formulation containing SP-WG21 exhibits a noticeably lighter color, directly highlighting its advantage in appearance.

Beyond visual improvement, SP-WG21 delivers superior formulation performance. Compared with the commercial benchmark, formulation incorporating SP-WG21 demonstrates significantly higher suspensibility and more uniform dispersion in water. Notably, no ″dead granules″ or partially disintegrated particles were observed after heat storage, ensuring consistent efficacy over time.

Following heat storage stability testing, all key performance indicators of the SP-WG21–based formulation fully met industry standards, confirming its reliability for long-term storage and commercial application.

Figure 2. 50% Pymetrozine WDG prepared with a commercial benchmark (left) and SP-WG21 (right).

During the preparation of 90% Diuron WDG using an extrusion granulation process, SP-WG21 and a commercial benchmark were each incorporated at a dosage of 4.2%. Experimental results demonstrate that formulations containing SP-WG21 enable smoother and more efficient granulation, significantly reducing processing difficulty.

Visual comparison of the finished products further highlights the advantages of SP-WG21. The Diuron WDG formulated with SP-WG21 shows a lighter and cleaner appearance, with exceptionally high granule integrity and smooth, compact surfaces. In contrast, formulations prepared with the commercial benchmark appear grayish yellow, with a noticeably higher rate of granule breakage, reflecting inferior integrity and overall appearance quality.

These results clearly demonstrate the core strengths of SP-WG21 in granulation performance and formulation quality control.

Figure 3. 90% Diuron WDG prepared with a commercial benchmark (left) and SP-WG21 (right).

If you are interested in cooperation with SINVOCHEM, please contact:

Alex. Lee |SINVOCHEM

Email: alex@sinvochem.com

Tel: 0086-15094373731