Performance of water-based adhesives for textile composites: in-depth analysis of tensile strength and material technology

1. Tensile strength: a key indicator for measuring the bonding effect of adhesives
Tensile strength, as one of the important indicators for measuring the bonding effect of adhesives, refers to the tensile force per unit area when the adhesive is damaged by the force. It directly reflects the strength of the bonding force between the adhesive and the bonded material, and is a key factor in determining the durability and stability of the textile after composite.

The reason why water-based adhesives perform well in tensile strength is mainly due to their unique molecular structure. These adhesive molecules usually contain polar groups, which can interact with the polar groups on the surface of textile fibers to form strong chemical bonds or physical adsorption. At the same time, the cross-linked network structure in water-based adhesives further enhances the strength and toughness of the adhesive, so that the bonded textiles can maintain a high stability when subjected to tensile forces.

2. The influence of adhesive types and formulas on tensile strength
The type and formula of water-based adhesives have a direct impact on their bonding effect. Different types of water-based adhesives differ in molecular structure, type and number of polar groups, cross-linking density, etc. These differences lead to different strengths of bonding when bonding textiles. Therefore, when selecting water-based adhesives, it is necessary to make comprehensive considerations based on the material, structure and application requirements of the bonded textiles to ensure that the bonded textiles have ideal tensile strength.

In addition, the formulation of the adhesive is also an important factor affecting tensile strength. Reasonable formulation design can optimize parameters such as the curing speed, curing temperature and curing degree of the adhesive, thereby improving the bonding efficiency and strength of the adhesive. For example, by adjusting the solid content and viscosity of the adhesive, the wettability and permeability during the bonding process can be controlled, thereby improving the tensile strength after bonding.

3. The influence of application process on tensile strength

The application process is one of the key factors that determine the bonding effect of water-based adhesives. In the textile composite process, the coating amount, coating method, drying and curing conditions of the adhesive will directly affect the tensile strength after bonding.

The control of the coating amount is crucial to ensure the uniformity and strength of bonding. Excessive coating amount may cause the adhesive to form an overly thick coating during the drying process, affecting the bonding effect; while too little coating amount may lead to incomplete bonding and reduce the tensile strength. Therefore, in practical applications, it is necessary to accurately control the coating amount according to the material and structure of the bonded textiles.

The choice of coating method will also affect the bonding effect. Different coating methods (such as dipping, spraying, brushing, etc.) have differences in the wettability, permeability and distribution uniformity of the adhesive. These differences may cause the bonded textiles to show different properties in terms of tensile strength.

Drying and curing conditions are one of the key factors that determine the bonding strength of adhesives. Reasonable drying and curing conditions can ensure that the adhesive is fully cured and forms a strong bond. Too high temperature or too long time may cause the adhesive to over-cure, reducing its flexibility and tensile strength; while too low temperature or too short time may cause the adhesive to be incompletely cured, affecting the bonding effect. Therefore, in practical applications, it is necessary to accurately control the drying and curing conditions according to the type and formula of the adhesive.

4. The influence of the material and structure of the bonded textiles on the tensile strength
The material and structure of the bonded textiles are also important factors affecting the tensile strength. Textiles of different materials have differences in fiber strength, toughness and surface properties. These differences lead to different interactions with the adhesive during the bonding process, thereby affecting the tensile strength after bonding. For example, textiles with higher fiber strength can better withstand the tensile force during the bonding process, thereby showing higher tensile strength.

The structure of the textile also affects the tensile strength. Textiles with higher warp and weft density can form more bonding points during the bonding process, thereby enhancing the tensile strength after bonding. At the same time, the thickness of the textile will also affect the wettability and permeability of the adhesive, thereby affecting the bonding effect. Therefore, when selecting the textile to be bonded, it is necessary to comprehensively consider its material and structure to ensure that the textile has the ideal tensile strength after bonding.