In the application process of Carbopol, shear resistance is a crucial rheological property that directly affects the product's user experience and stability. The shear property of Carbopol refers to its characteristic of viscosity changing when subjected to shear force. Specifically, Carbomer gel has pseudoplastic rheological properties. When it is subjected to shear force, the viscosity will rapidly decrease, and when the shear force disappears, the viscosity can quickly recover. This property enables Carbomer to have a good spread when applied, and can maintain a stable gel state after use.

Carbopol powder

The Formation Mechanism of Carbopol Shear Properties

The shear properties of Carbopol stem from its unique molecular structure. Carbopol is a high molecular weight polymer formed by chemical crosslinking of acrylic acid or acrylic ester with allyl ether, containing a large number of carboxylic acid groups in the molecule. When carbomer is neutralized, carboxyl groups undergo ionization, and due to the repulsive interaction between negative charges, the originally coiled molecular chains stretch into a greatly expanded state, forming a three-dimensional network structure. This network structure undergoes reversible deformation and disentanglement under shear force, resulting in a decrease in viscosity; After the shear force disappears, the molecular chain returns to its cross-linked state, and the viscosity also recovers accordingly.

Differences in Shear Properties of Different Models of Carbopol

Different models of Carbopol exhibit significant differences in shear performance. Carbopol 940 has extremely short rheological properties and high viscosity, but low shear resistance. Long term stirring or high shear stirring can cause viscosity loss. Carbopol 941 has long rheology, low viscosity, and low shear resistance. New models such as Carbopol 934 and Carbopol 1342 have high shear resistance and can maintain good stability under high shear conditions. These differences mainly stem from the differences in crosslinking degree, molecular weight, and molecular structure of different types of carbomers.

The influence of shear on product performance

The shear properties of Carbopol directly affect the performance and stability of the product. In cosmetics, good shear properties make the product easy to spread when applied and maintain a stable texture after use, avoiding delamination or sedimentation. In the field of medicine, the shear properties of Carbopol contribute to the uniform release and absorption of drugs. However, if the shear resistance of Carbopol is insufficient, viscosity loss may occur during production and transportation due to mechanical shear, affecting the quality and stability of the product.

Optimization and Control of Shear Properties

In order to achieve ideal shear performance, it is necessary to optimize the formula design and production process. The key is to choose the appropriate Carbopol model, and select a model with appropriate rheological and shear resistance according to the specific needs of the product. In the formula, shear properties can be improved by adding other thickeners or rheological modifiers. During the production process, prolonged stirring or high shear stirring should be avoided, and the addition speed and method of neutralizing agents should be controlled to reduce damage to the carbomer structure.

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Hubei Xindesheng: Professional Carbopol Supplier

In the production and application field of Carbopol, Hubei Xindesheng Material Technology Co., Ltd. provides customers with high-quality Carbopol products and professional technical support with profound technical accumulation and rich production experience. The Carbopol series products produced by the company have excellent rheological properties, including good shear resistance and stability, which can meet the needs of different application scenarios. Welcome to inquire and order.