Modified material film of micropore film composite nonwoven fabric for waterproof dustproof acoustically transparent expanded polytetrafluoroethylene (PTFE) and preparation method thereof

Abstract

The invention relates to a modified material film of a micropore film composite nonwoven fabric for waterproof dustproof acoustically transparent expanded polytetrafluoroethylene (PTFE) and a preparation method thereof. The modified material film comprises a micropore film layer of an expanded PTFE, one or more layers of nonwoven fabrics compounded and connected with the micropore film layer surface of the expanded PTFE; the modified material film can protect a loud speaker, a microphone, an alarm and the like while keeping the tonal quality of an apparatus, further prevents common liquids such as beverage, beer, coffee and the like, and can tolerate the water soaking; the protection level can achieve IP67; the dewing phenomenon in the loud speaker, the microphone and the alarm can be eliminated; the capability of tolerating the environment temperature change is improved, the shell design difficulty and the manufacturing cost are reduced, the cold flow property of the micropore film of the expanded PTFE is solved, and the processability is improved; the modified material film can be manufactured as dustproof waterproof venting acoustically transparent bolts, pasters and other ready-to-use components with a series of standard venting product sizes for the loud speaker, the microphone, the alarm and the like; and therefore, the design application is convenient.

Description

technical field [0001] The invention relates to a film and a preparation method thereof, in particular to a modified material film of expanded polytetrafluoroethylene microporous film composite non-woven fabric for waterproof, dustproof and sound transmission and a preparation method thereof. Background technique [0002] The traditional speaker, microphone and siren structure is an open environment, so that the speaker, microphone and siren are exposed to the external environment. When speakers, microphones and sirens work for a long time, thermal expansion and contraction and ultraviolet radiation cause rainwater and damp fog to invade the interior along the seams of speakers, microphones and sirens, making electrical circuits and electronic components oxidize, and affecting the circuit for a long time Reliability of operation, many speakers, microphones and sirens failed and failed to sound properly before their normal lifespan. Contents of the invention [0003] In or...

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Problems solved by technology

[0003] In order to overcome the above defects, the technical problem to be solved by the present invention is to propose a waterproof, dustproof and sound-permeable device that solves the problem of unbalanced pressure inside and outside the speaker, microphone and alarm, and further improves the stability of the speaker, microphone and alarm. Modified material membrane of expanded polytetrafluoroethylene microporous film composite non-woven fabric and preparation method thereof

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