CN106939123A - Waterproof moisture-permeable film - Google Patents

Abstract

The invention discloses a waterproof and moisture-permeable film, which includes a polyurethane matrix, a first infrared photothermal conversion material and a second infrared photothermal conversion material. The polyurethane matrix is polymerized from a polymer material containing polyethylene glycol. The first infrared photothermal conversion material has a plurality of tungsten oxide particles and/or composite tungsten oxide particles dispersed in the polyurethane matrix. The second infrared photothermal conversion material has a plurality of antimony-doped tin oxide particles dispersed in the polyurethane matrix. The waterproof and moisture-permeable film of the present invention has better moisture-permeable efficiency.

Description

Waterproof and moisture-permeable film

technical field

The invention relates to a waterproof and moisture-permeable film, in particular to a waterproof and moisture-permeable film that can improve the moisture-permeable efficiency.

Background technique

In the prior art, in order to keep the user's body dry, waterproof and moisture-permeable fabrics are used to make functional clothing. When the user wears the above-mentioned functional clothing, the sweat from the body forms water vapor and can diffuse to the outside through the waterproof and moisture-permeable fabric, so as to avoid the user feeling stuffy, while the external rain or fog and other water droplets cannot pass through the waterproof and moisture-permeable fabric. In order to prevent the user's body from being drenched, so as to achieve the effect of waterproof and moisture permeability at the same time. Generally speaking, there are two ways to make waterproof and moisture-permeable fabrics. One is to coat the fabric with a waterproof and moisture-permeable functional layer to further form a waterproof and moisture-permeable fabric. The other is to use polymer materials to form a waterproof and moisture-permeable fabric. The characteristic film can be directly used as waterproof and breathable fabric. Waterproof and moisture-permeable fabrics have different moisture-permeable efficiencies depending on the material and structure. How to improve the moisture permeability of waterproof and moisture-permeable fabrics has always been a very important issue in the industry.

Contents of the invention

The object of the present invention is to provide a waterproof and moisture-permeable film that can improve the moisture-permeability efficiency, so as to solve the problems of the prior art.

The waterproof and moisture-permeable film of the present invention comprises a polyurethane matrix, a first infrared light-to-heat conversion material, and a second infrared light-to-heat conversion material. The polyurethane matrix is polymerized from polymer materials containing polyethylene glycol. The first infrared light-to-heat conversion material has a plurality of tungsten oxide particles and/or composite tungsten oxide particles dispersed in the polyurethane matrix. The second infrared light-to-heat conversion material has a plurality of antimony-doped tin oxide particles dispersed in the polyurethane matrix.

In an embodiment of the present invention, the weight percentage of the first infrared light-to-heat conversion material in the waterproof and moisture-permeable film is between 0.5% and 10%, and the second infrared light-to-heat conversion material in the waterproof and moisture-permeable film The weight percentage in is between 0.5% and 10%.

In one embodiment of the present invention, the polyurethane matrix is polymerized from polyethylene glycol, isocyanate and chain extender.

In one embodiment of the present invention, the polyurethane matrix is polymerized by mixing polyethylene glycol with polyester polyol, isocyanate and chain extender.

In one embodiment of the present invention, the polyurethane matrix is polymerized by mixing polyethylene glycol with polyether polyol, isocyanate and chain extender.

In an embodiment of the present invention, the average particle size of the first infrared light-to-heat conversion material and the second infrared light-to-heat conversion material is less than 50 microns. The suboptimal average particle size of the first infrared light-to-heat conversion material and the second infrared light-to-heat conversion material is less than 10 microns. The optimal average particle size of the first infrared light-to-heat conversion material and the second infrared light-to-heat conversion material is less than 0.1 micron.

In an embodiment of the present invention, the waterproof and moisture-permeable film further includes a third infrared light-to-heat conversion material having a plurality of titanium dioxide particles coated with antimony-doped tin dioxide dispersed in the polyurethane matrix.

In an embodiment of the present invention, the weight percentage of the first infrared light-to-heat conversion material in the waterproof and moisture-permeable film is between 0.5% and 10%, and the second infrared light-to-heat conversion material in the waterproof and moisture-permeable film The weight percentage of the third infrared light-to-heat conversion material in the waterproof and moisture-permeable film is between 0.5% and 10%.

Compared with the prior art, the waterproof and moisture-permeable film of the present invention is added with infrared light-to-heat conversion materials with different infrared absorption wavelength ranges to increase the temperature rise of the waterproof and moisture-permeable film after sunlight irradiation, thereby enhancing the diffusion of the waterproof and moisture-permeable film water vapor capacity. Therefore, the waterproof and moisture-permeable film of the present invention has better moisture permeability efficiency.

Description of drawings

Fig. 1 is a schematic diagram of the first embodiment of the waterproof and moisture-permeable film of the present invention.

Fig. 2 is a schematic diagram of a second embodiment of the film coating device of the present invention.

Explanation of reference signs:

100, 100' waterproof and moisture-permeable membrane;

110 polyurethane matrix;

120 The first infrared light-to-heat conversion material;

130 second infrared photothermal conversion material;

140 The third infrared light-to-heat conversion material.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

Please refer to FIG. 1 , which is a schematic diagram of a first embodiment of the waterproof and moisture-permeable film of the present invention. As shown in FIG. 1 , the waterproof and moisture-permeable film 100 of the present invention includes a polyurethane matrix 110 , a first infrared light-to-heat conversion material 120 and a second infrared light-to-heat conversion material 130 .

The polyurethane matrix 110 is formed by polymerizing polymer materials including polyethylene glycol (PEG). For example, the polyurethane matrix can be formed by polymerizing polyethylene glycol, isocyanate and a chain extender; or The polyurethane matrix can be polymerized by polyethylene glycol mixed with polyester polyol, isocyanate and chain extender; or the polyurethane matrix can be polymerized by polyethylene glycol mixed with polyether polyol, isocyanate and chain extender . Since polyethylene glycol is a hydrophilic polymer material, when polyethylene glycol and other polymer materials are polymerized into a polyurethane matrix, the polyurethane matrix has moisture permeability. Furthermore, the polyurethane matrix can prevent water droplets from passing through, so the polyurethane matrix can provide waterproof and moisture-permeable functions at the same time.

The first infrared light-to-heat conversion material 120 has a plurality of tungsten oxide particles and/or composite tungsten oxide particles dispersed in the polyurethane matrix 110 . The tungsten oxide particles of the first infrared light-to-heat conversion material 120 may be represented by the chemical formula WyOz, W is tungsten, O is oxygen, and 2.2<z/y<3. The composite tungsten oxide particles in the first infrared photothermal conversion material 110 can be represented by the chemical formula MxWyOz, M is H, He, alkali metal, alkaline earth metal, rare earth element, Cs, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, One or more elements selected from Br, Te, Ti, Nb, V, Mo, Ta, Re, Hf, Os, Bi and I, W is tungsten, O is oxygen, 0.001 < x/y < 1, 2.2< z/y < 3. The second infrared light-to-heat conversion material 130 has a plurality of antimony-doped tin oxide particles dispersed in the polyurethane matrix 110 .

The moisture permeability efficiency of the waterproof and moisture-permeable film 100 of the present invention can be expressed by the following diffusion formula:

where J is the diffusion flux, D is the diffusion coefficient, C is the concentration, and X is the distance. In other words, the larger the diffusion coefficient D, the stronger the ability of the waterproof and moisture-permeable film to diffuse water vapor, that is, the higher the moisture-permeability efficiency of the waterproof and moisture-permeable film 100 of the present invention. Since the diffusion coefficient D is positively correlated with temperature, the higher the temperature of the waterproof and moisture-permeable film 100 of the present invention is, the higher the moisture permeability efficiency of the waterproof and moisture-permeable film 100 of the present invention is.

Since the waterproof and moisture-permeable film 100 of the present invention includes the first infrared light-to-heat conversion material 120 and the second infrared light-to-heat conversion material 130, when the waterproof and moisture-permeable film 100 of the present invention is irradiated by sunlight, the first infrared light-to-heat conversion material 120 and the second infrared light-to-heat conversion material 130 convert infrared rays in sunlight into thermal energy, so that the temperature of the waterproof and moisture-permeable film 100 rises faster, thereby improving the moisture permeability efficiency of the waterproof and moisture-permeable film 100 of the present invention.

In addition, since the infrared absorption wavelength range of the tungsten oxide particles and/or composite tungsten oxide particles in the first infrared light-to-heat conversion material 120 is between 900 nm and 1700 nm, while the second infrared light-to-heat conversion material 130 is doped with antimony The infrared absorption wavelength range of tin dioxide particles is between 1700 nanometers and 2300 nanometers, so the waterproof and moisture-permeable film 100 of the present invention has a relatively large infrared absorption wavelength range (between 900 nanometers and 2300 nanometers), thereby making The waterproof and moisture-permeable film 100 of the present invention can have a better temperature rise effect under sunlight irradiation, so as to further improve the moisture-permeable efficiency.

In the waterproof and moisture-permeable film 100 of the present invention, the optimum photothermal conversion concentration of the first infrared photothermal conversion material 120 is between 5 g/m ² and 6 g/m ² , for example, when the dry film thickness When the thickness is 15 μm, the weight of the dry film is about 15 grams per square meter. Calculated based on the optimal concentration, the percentage of the first infrared light-to-heat conversion material in the total weight is between 33% and 40%; when the added amount is less than 40% When the added concentration increases, the temperature rise caused by the absorption of infrared rays by the waterproof and moisture-permeable film 100 will increase accordingly; when the added amount is greater than 40%, the temperature rise caused by the absorption of infrared rays does not increase with the increase of the added concentration.

The optimum photothermal conversion concentration of the second infrared photothermal conversion material is between 10 and 12 g/m ² , for example, when the dry film thickness is 15 μm, the dry film weight is about 15 grams per square meter, and Calculating the optimum concentration, the percentage of the second infrared photothermal conversion material in the total weight is between 67% and 80%; when the addition amount is less than 80%, as the concentration increases, the waterproof and moisture-permeable film 100 will absorb infrared The resulting temperature rise will increase accordingly; when the added amount is greater than 80%, the temperature rise caused by the absorption of infrared rays will not increase with the increase of the added concentration.

However, considering the moisture permeability efficiency of the waterproof and moisture-permeable film 100 of the present invention, the weight percentage of the first infrared light-to-heat conversion material and the second infrared light-to-heat conversion material in the infrared light-to-heat conversion film is optimally between 0.5% and 10% %between.

Please refer to FIG. 2 , which is a schematic diagram of a second embodiment of the waterproof and moisture-permeable film of the present invention. As shown in Figure 2, the waterproof and moisture-permeable film 100' of the present invention includes a polyurethane matrix 110, a first infrared light-to-heat conversion material 120 and a second infrared light-to-heat conversion material 130, and a third infrared light-to-heat conversion material 140. . The third infrared light-to-heat conversion material 140 has a plurality of titanium dioxide particles coated with antimony-doped tin oxide dispersed in the polyurethane matrix 110 . Since the titanium dioxide particles are white and the antimony-doped tin oxide particles are blue, the third infrared light-to-heat conversion material 140 can not only convert infrared rays into heat energy, but also increase the whiteness of the waterproof and moisture-permeable film 100'. In this way, the waterproof and moisture-permeable film 100' of the present invention can have more changes in color.

The following are descriptions of various embodiments of the present invention:

Example 1:

The manufacturing method of the waterproof and moisture-permeable film of the present invention may firstly mix the first and second external light-to-heat conversion materials with polyurethane to prepare polymer masterbatches respectively containing the first and second infrared light-to-heat conversion materials. The first infrared light-to-heat conversion material is cesium-doped tungsten oxide particles, and the molar ratio of cesium to tungsten is 0.33:1, and the second infrared light-to-heat conversion material is antimony-doped tin oxide particles. The waterproof and moisture-permeable film of the present invention is prepared by mixing the polymer masterbatches respectively containing the first and second infrared light-to-heat conversion materials according to a predetermined ratio. For example, after the first infrared light-to-heat conversion material and a polyurethane matrix are fully mixed with a high-speed mixer, a twin-screw extruder is used to mix the well-mixed infrared light-to-heat conversion material at a temperature of 160° C. to 190° C. Blending and extruding with the polyurethane matrix to obtain a first infrared light-to-heat conversion polyurethane masterbatch. The weight ratio of the first infrared light-to-heat conversion material to the polyurethane matrix is 1:0.1:8.9, that is, based on the total weight of the first infrared light-to-heat conversion polyurethane masterbatch, the content of the first infrared light-to-heat conversion material is 10% by weight percentage. The preparation method of the second infrared light-to-heat conversion polyurethane masterbatch is similar to that of the first infrared light-to-heat conversion polyurethane masterbatch.

When preparing infrared light-to-heat conversion polyurethane masterbatch, a dispersant can also be added, the dispersant includes polyalcohol, polyether polyol, polyester polyol, polyester-polysiloxane, polyamide wax, oxidized polyalkylene Waxes, polyester waxes or combinations thereof. More specifically, the dispersant comprises polyethylene glycol, polycaprolactone diol, polycarbonate diol, polycaprolactone-polysiloxane, oxidized polyethylene wax, polyethylene-vinyl acetate wax or The combination thereof can improve the dispersibility of particles in the infrared conversion material by means of the dispersant, which is beneficial to reduce the particle size of the particles in the infrared conversion material and provide a film with higher light transmittance.

Example 1 The obtained first infrared light-to-heat conversion polyurethane masterbatch, the second infrared light-to-heat conversion polyurethane masterbatch and polyurethane matrix were mixed at a weight ratio of 5:5:90 to obtain a mixture, so that a The double-layer blown film machine operates at a temperature of 140 ° C to 170 ° C; the mixture is extruded from the inner layer through the single-screw extruder, and the low-density polyethylene is extruded from the outer layer through the single-screw extruder. The layer is extruded through the extrusion port, and the double-layer film is rewound by a rewinding wheel after being cooled, and then the low-density polyethylene is peeled off to obtain an infrared light-to-heat conversion polyurethane film with a thickness of 25 μm. However, the film preparation method of the present invention is not limited thereto. The first infrared light-to-heat conversion material can also be thoroughly mixed with a dispersant and butanone, and then ground by a wet grinder to obtain a first infrared light-to-heat conversion slurry. The weight ratio of the first infrared light-to-heat conversion material, dispersant and butanone is 1:0.1:8.9, that is, based on the total weight of the first infrared light-to-heat conversion polyurethane masterbatch, the first infrared light-to-heat conversion material The content is 10% by weight. The preparation method of the second infrared light-to-heat conversion paste is similar to that of the first infrared light-to-heat conversion paste. In Example 1 of the present invention, the first infrared light-to-heat conversion slurry, the second infrared light-to-heat conversion slurry, and the solvent-based polyurethane matrix can be uniformly mixed at a weight ratio of 5:5:90 to obtain a mixture, which is obtained by using a scraper type The coating machine evenly coats the mixture on the release film, places the release film coated with the mixture in an oven at 80°C, and removes the solvent to obtain an infrared photothermal conversion polyurethane film. The thickness is 25 μm.

Example 2:

Embodiment 2 is generally the same as Embodiment 1. The first infrared light-to-heat conversion material, the second infrared light-to-heat conversion material and the polyurethane matrix are mixed at a weight ratio of 0.5:2.5:97 to prepare an infrared light-to-heat conversion polyurethane film.

Example 3:

In Example 3, the third external light-to-heat conversion material and polyurethane were mixed to prepare a third infrared light-to-heat conversion polyurethane masterbatch. The preparation method of the third infrared light-to-heat conversion polyurethane masterbatch is similar to that of the first infrared light-to-heat conversion polyurethane masterbatch. Embodiment 3 is generally the same as Embodiment 1. The first infrared light-to-heat conversion material, the second infrared light-to-heat conversion material, the third infrared light-to-heat conversion material and the polyurethane matrix are mixed at a weight ratio of 0.5:2:0.5:97 to prepare an infrared light-to-heat conversion polyurethane film.

Example 4:

Embodiment 4 is generally the same as Embodiment 1. The first infrared light-to-heat conversion material, the second infrared light-to-heat conversion material and the polyurethane matrix are mixed at a weight ratio of 1.5:3.5:95 to prepare an infrared light-to-heat conversion polyurethane film.

Example 5:

Embodiment 5 is generally the same as Embodiment 1. The first infrared light-to-heat conversion material, the second infrared light-to-heat conversion material and the polyurethane matrix are mixed at a weight ratio of 3.5:6.5:90 to prepare an infrared light-to-heat conversion polyurethane film.

Embodiment 6:

Embodiment 6 is generally the same as Embodiment 1. The first infrared light-to-heat conversion material, the second infrared light-to-heat conversion material and the polyurethane matrix are mixed at a weight ratio of 5:10:85 to prepare an infrared light-to-heat conversion polyurethane film.

In the embodiment of the present invention, the weight percentage of the first infrared light-to-heat conversion material 120 in the waterproof and moisture-permeable film is between 0.1% and 10%, and the weight percentage of the second infrared light-to-heat conversion material 130 in the waterproof and moisture-permeable film The weight percentage is between 0.1% and 10%, and the weight percentage of the third infrared light-to-heat conversion material in the waterproof and moisture-permeable film is between 0.1% and 10%.

The moisture permeability measurement method of the present invention is to prepare an acrylic box with a cover that can be lifted, add a small amount of water in the box and place a temperature and humidity meter, which can record the temperature and humidity in the box at any time. Dry calcium chloride is placed in the moisture-permeable cup. The main function of calcium chloride is to maintain the humidity in the moisture-permeable cup at a low humidity state, while the acrylic box is to provide the environment with a high humidity state. When measuring moisture permeability, the mouth of the cup is facing upwards, so that the film covered on the mouth of the cup is exposed to sunlight. Due to the difference in humidity inside and outside the moisture-permeable cup, a humidity gradient is formed, so that the ambient water vapor diffuses into the moisture-permeable cup through the film. Measure the total weight of the moisture permeable cup at a fixed time and calculate the moisture permeability. Please refer to Table 1. Table 1 shows the moisture permeability measurement results of waterproof and moisture-permeable films with different formula ratios under sunlight.

Table I

Formula ratio Comparative example 1 Comparative example 2 Comparative example 3 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 The first infrared photothermal conversion material (wt%) 0 0 1 0.5 0.5 0.5 1.5 3.5 5 Second infrared photothermal conversion material (wt%) 0 1 0 0.5 2.5 2 3.5 6.5 10 The third infrared photothermal conversion material (wt%) 0 0 0 0 0 0.5 0 0 0 Polyurethane matrix (wt%) 100 99 99 99 97 97 95 90 85 Temperature difference from Comparative Example 1 (°C) 0 1.1 0.8 2.2 4.1 3.7 4.6 5.3 5.5 Moisture permeability (g/m ² *24hr) 5145 5207 5239 5490 5988 5702 5549 5308 4952

The thickness of the waterproof and moisture-permeable films of this example and the comparative example is 25 μm. From the moisture permeability measurement results in Table 1, it can be seen that the waterproof and moisture-permeable films of Examples 1 to 5 are compared with the waterproof and moisture-permeable films of Comparative Examples 2 to 3 in The moisture permeability is higher under sunlight. Since the waterproof and moisture-permeable films of Examples 1 to 5 of the present invention have infrared light-to-heat conversion particles in two or more different infrared absorption wavelength ranges, the waterproof and moisture-permeable films of Comparative Examples 2 to 3 only have infrared rays in a single infrared absorption wavelength range. Light-to-heat conversion particles, so the waterproof and moisture-permeable films of Examples 1 to 5 of the present invention have a large range of infrared absorption wavelengths, and have better infrared light-to-heat conversion efficiency, which makes the film temperature higher, and can provide higher permeability. wet efficiency. Example 6 shows that when the total content of the infrared light-to-heat conversion material is 15% by weight, the temperature does not rise significantly, and the moisture permeability rate drops significantly due to the low content of the moisture-permeable matrix. Therefore, it can be known from Table 1 that the optimal total content of infrared light-to-heat conversion materials is between 0.5% and 5%.

On the other hand, the optimal total content ratio of the first infrared light-to-heat conversion material 120 and the second infrared light-to-heat conversion material 130 in the waterproof and moisture-permeable film of the present invention can also be expressed by the optimal concentration (g/m ^{2 )} , for example For example, when the dry film thickness is 15 μm, the dry film weight is about 15 grams per square meter, and the optimal total content concentration of the infrared light-to-heat conversion material in the waterproof and moisture-permeable film is between 0.075 g/m ² and 0.75 g/ ^m2 between. Compared with the previous technology, the waterproof and moisture-permeable film of the present invention is added with infrared light-to-heat conversion particles of different infrared absorption wavelength ranges to increase the temperature rise of the waterproof and moisture-permeable film after sunlight irradiation, thereby enhancing the diffusion of water by the waterproof and moisture-permeable film. steam capacity. Therefore, the waterproof and moisture-permeable film of the present invention has better moisture permeability efficiency.

The above-mentioned embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention shall be determined by the claims.

Claims (8)

1. a kind of Waterproof ＆ Moisture Permeable Film, it is characterised in that include：

One polyurethane substrates, the wherein polyurethane substrates are polymerized by the macromolecular material comprising polyethylene glycol；

One first infrared photothermal transition material, with multiple tungsten oxide particulates and/or combined oxidation tungsten particulate, is dispersed in this and gathers In urethane matrix；And

One second infrared photothermal transition material, with multiple antimony doped tin oxide particulates, is dispersed in the polyurethane substrates.

2. Waterproof ＆ Moisture Permeable Film as claimed in claim 1, it is characterised in that the first infrared photothermal transition material is anti-at this Percentage by weight in water moisture-permeable film is between 0.5% and 10%, and the second infrared photothermal transition material is saturating in the waterproof Percentage by weight in wet film is between 0.5% and 10%.

3. Waterproof ＆ Moisture Permeable Film as claimed in claim 1, it is characterised in that the polyurethane substrates are by polyethylene glycol, isocyanide Acid esters and chain extender are polymerized.

4. Waterproof ＆ Moisture Permeable Film as claimed in claim 1, it is characterised in that the polyurethane substrates are poly- by polyethylene glycol mixing Ester polyol, isocyanates and chain extender are polymerized.

5. Waterproof ＆ Moisture Permeable Film as claimed in claim 1, it is characterised in that the polyurethane substrates are poly- by polyethylene glycol mixing Ethoxylated polyhydric alcohol, isocyanates and chain extender are polymerized.

6. Waterproof ＆ Moisture Permeable Film as claimed in claim 1, it is characterised in that the first infrared photothermal transition material and this The average grain diameter of two infrared photothermal transition materials is less than 50 microns.

7. Waterproof ＆ Moisture Permeable Film as claimed in claim 1, it is characterised in that also comprising one the 3rd infrared ray hot-cast socket material Material, with multiple titanium dioxide fine particles coated by antimony doped tin oxide, is dispersed in the polyurethane substrates.

8. Waterproof ＆ Moisture Permeable Film as claimed in claim 7, it is characterised in that the first infrared photothermal transition material is anti-at this Percentage by weight in water moisture-permeable film is between 0.5% and 10%, and the second infrared photothermal transition material is saturating in the waterproof Percentage by weight in wet film is between 0.5% and 10%, and the 3rd infrared photothermal transition material is thin in the Waterproof Breathable Percentage by weight in film is between 0.5% and 10%.