Intelligent waterproof moisture-permeable film and preparation method thereof

Abstract

The invention discloses an intelligent waterproof moisture-permeable film. A matrix material and a waterproof moisture-permeable functional material are prepared into the waterproof moisture-permeable film by using a screw extruder in a film blowing method or a flow casting method. The preparation method comprises the following steps of: firstly cleaning and drying the matrix material for standby application; secondly, squeezing out a thermoplastic carrier material, inorganic nanometer particles and a processing agent at a certain extrusion temperature by using the extruder in a melt mixing method according to a certain mass ratio to prepare the waterproof moisture-permeable functional material; and finally, preparing the product by adopting the film blowing method or the flow casting method at the extrusion temperature condition of 120 DEG C-250 DEG C after mixing the matrix material and the prepared waterproof moisture-permeable functional material according to a mass ratio of 100:5-200. The intelligent waterproof moisture-permeable film has excellent waterproof moisture-permeable function in all weathers, i.e. a preferential temperature and a humidity range and has the characteristics of simple production technology, low cost of raw materials and high production efficiency.

Description

Technical field [0001] The invention relates to the technical field of preparation and modification of functional polymer materials, in particular to a waterproof and moisture-permeable membrane, in particular to an intelligent waterproof and moisture-permeable membrane and a preparation method thereof. Background technique [0002] At present, most of the waterproof and moisture-permeable materials with relatively good performance on the market are mainly thermoplastic polyurethane. Polyurethane (PU) is a macromolecular material containing urethane groups in its molecular chain. According to whether the molecular chain is cross-linked or not, it can be divided into thermoplastic polyurethane (TPU) and cross-linked polyurethane (CPU). Generally speaking, polyurethane is mainly obtained by the gradual addition polymerization of polyols, isocyanates and small molecule chain extenders. By controlling the molar ratio of isocyanate and hydroxyl, functional polymer materials with exce...

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Problems solved by technology

[0005] 1. Although the waterproof effect of pure TPU film is good, its moisture permeability is only 2000g / (m2)-1(24h)-1, and its application field is very limited

[0006] 2. The function of waterproof and moisture permeability is single, which cannot meet the requirements of use in all-weather and complex environments such as high temperature, low temperature, strong shear force field, etc.

[0007] 3. The mechanical properties of the membrane are poor and easy to break

[0008] 4. The waterproof and moisture permeability of the membrane is not uniform

[0009] 5. The waterproof and moisture-permeable membrane technology is mostly monopolized by large foreign companies such as Europe and the United States, and the price is expensive

[0010] It is precisely because of the awareness of the above defects that people often add some inorganic fillers such as calcium carbonate, talcum powder, barium sulfate, etc. in the actual use of polyurethane materials to achieve the purpose of reducing the cost of raw materials, but unfortunately such The amount of inorganic filler added is very limited

And when the added amount exceeds a certain value, the mechanical properties of the polyurethane material will be significantly damaged, which can no longer meet the use requirements of related fields.

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