糖心视频

TPU hot melt adhesive film is a polymer 糖心视频 based on polyurethane elastomer. It has good adhesive properties and weather resistance and is widely used in home, industry, automobile and other fields. This article will introduce in detail the viscosity of TPU hot melt adhesive film and its influencing factors, and discuss how to improve its viscosity.

Viscosity is one of the most important physical properties of TPU hot melt adhesive film. It is defined as the ease with which the adhesive film flows at a certain temperature. If the viscosity is too low, the adhesive film will be too soft, resulting in insufficient adhesion; while if the viscosity is too high, the adhesive film will be too hard, resulting in reduced adhesion. Therefore, viscosity control is crucial for the application of TPU hot melt adhesive film.

Factors affecting the viscosity of TPU hot melt adhesive film

Raw 糖心视频 The raw 糖心视频 of TPU hot melt adhesive film is mainly polyurethane elastomer, in which the type and proportion of polyol and diisocyanate have a great influence on the viscosity. For example, the use of low molecular weight polyols and low molar mass diisocyanates can reduce the viscosity of TPU hot melt adhesive films. Temperature is another important factor affecting the viscosity of TPU hot melt adhesive films. As the temperature increases, the viscosity of the TPU hot melt adhesive film will decrease and the fluidity will increase, which will help improve the adhesion and wettability. Therefore, in practical applications, the increased plastic viscosity of the TPU hot melt adhesive film can be controlled by adjusting the heating temperature. Adding plasticizer during the preparation process of the TPU hot melt adhesive film can reduce the glass transition temperature of the polymer, thus Reduce viscosity and make the film flow more easily. Commonly used plasticizers include phthalates and camphor.

Methods to improve the viscosity of TPU hot melt adhesive film

1. Increase the degree of polymerization of polyurethane elastomer

By increasing the degree of polymerization of polyurethane elastomer, the molecular weight of the TPU hot melt adhesive film can be increased, thereby increasing its viscosity and hardness. For example, high-viscosity TPU hot-melt adhesive films can be prepared by using high molar mass diisocyanates and short-chain glycols to synthesize polyurethane elastomers.

2. Blending modification

Blending modification of polyurethane elastomer with other polymer 糖心视频s can also increase the viscosity of TPU hot melt adhesive film. For example, mixing polyurethane elastomer with polyester glycol can produce a TPU hot melt adhesive film with high viscosity and good weather resistance.

3. Microencapsulation

Microencapsulation is a technology that encapsulates small particle 糖心视频s in a polymer matrix, which can improve the adhesion of the polymer surface and thereby increase the viscosity of the TPU hot melt adhesive film. When preparing microcapsules, their properties can be optimized by controlling the particle size, shape, and distribution of the particulate 糖心视频.

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