PVB (polyvinyl butyral) film with sound insulation performance and preparation method of PVB film

Abstract

The invention relates to a three-layer type PVB (polyvinyl butyral) film with sound insulation performance and a preparation method. The three-layer type PVB film is prepared from resin films on a lower A layer, a middle B layer and an upper C layer through pressing, wherein the middle B layer is prepared from, in percentage by mass, 30%-60% of improved PBV resin powder and 40%-70% of a plasticizer; each of the lower A layer and the upper C layer is prepared from, in percentage by mass, 60%-80% of improved PVB resin powder and 20%-40% of a plasticizer; the improved PVB resin powder is prepared from components in percentage by mass as follows: 7.5wt%-10.0wt% of polyvinyl alcohol, 3.0wt%-10.0wt% of butanal, 1.0wt%-6.0wt% of hydrochloric acid, 0.01wt%-0.10wt% of a surfactant and the balance of pure water. The preparation method comprises steps as follows: preparation of the improved PVB resin powder and preparation of the three-layer type PVB film. The three-layer type PVB film has the function of insulating noise at 1,000-4,000 Hz after being applied to sandwich glass and improves the sound insulation effect by 3-5 dB.

Description

technical field [0001] The invention belongs to the technical field of PVB (polyvinyl butyral) film and its preparation, in particular to a PVB film with sound insulation performance and a preparation method. Background technique [0002] With the tense energy situation and the improvement of human comfort, the sound insulation of doors and windows is also increasingly on the agenda. As we all know, sound is a kind of vibration wave. The frequency that the human ear can hear is 20-20000Hz, and the particularly sensitive frequency is 1000-4000Hz. End customers in the field of sound insulation film applications are paying more and more attention to noise reduction in automobiles and architectural glass, and they are also focusing on safety factors. Because noise pollution affects people's working and living environments, noise reduction is a very important engineering indicator. . [0003] In the past, people usually used solids or increased the degree of glass to improve th...

AI Technical Summary

Problems solved by technology

However, improving the structure of PVB resin, adjusting the mechanical factors of different PVB film layers by increasing the content of butyraldehyde groups, reducing hydroxyl groups, or increasing the proportion of plasticizers will have the following risks: 1. The mechanical properties of the film will decrease; 2. The aging resistance will decrease. 3. The problem of plasticizer precipitation

At the same time, due to the large difference in physical properties of materials in the preparation of multilayer films, it is difficult to form films with uniform thickness and difficult processing, resulting in poor practicability and no marketization.

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