Effects of Organosilane Coupling Agents on Glass Fiber Reinforced Thermoplastics

1. Surface treatment of glass fiber by silane coupling agents

Because glass fiber reinforced thermoplastics have the advantages of high toughness, damage resistance, excellent processability, and low product cost, they have been paid more and more attention by people.

However, glass fiber and polymer molecules are very different in chemical structure and physical form, and have poor affinity, and the viscosity of the material is significantly increased due to the addition of glass fiber, and even affects the processing performance of the material. In addition, due to the uneven mixing of glass fiber and polymer, and the weak adhesion, the mechanical properties of the product are reduced. For glass fiber, silane coupling agent is still one of the coupling agents with good surface treatment effect. Generally, the surface treatment of glass fiber with organosilane coupling agent is as follows:

(1) Pre-treatment method. Silane is added to the glass fiber sizing formulation to make the glass fiber surface treated during the drawing operation.

(2) Chemical heat treatment method. First burn off the ancient wax emulsified sizing agent of glass fiber textile products or remove it with chemical solvent, and then use silane coupling agent for surface treatment.

(3) Migration method. Usually, the bi-silicon silicone is directly blended into the resin for use. From the perspective of production and actual conditions, the method of directly adding the coupling agent to the glass fiber sizing agent and performing surface treatment during the wire drawing operation is usually adopted.

2. The effect of silane coupling agents on glass fiber modified thermoplastics

The use of silane surface-treated glass fiber reinforced thermoplastics can improve the affinity of glass fibers and resins, and can improve the performance of composite materials. When choosing silicone, not only the silane itself, but also the synergistic or repulsive effect of other additives in the sizing agent should be considered.

In the preparation of glass fiber reinforced polymer composites, the pretreatment method of directly adding an organosilane coupling agent to the glass fiber infiltration formulation is usually adopted. The action mechanism of the coupling agent at the interface is mainly based on the chemical bond theory of the chemical reaction at the interface. Adding the third component of active organic matter to the non-polar polymer can promote the bonding between the coupling agent and the resin.

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