CN104479337B - Preparation process of waterproof air-permeable moisture-permeable microporous film - Google Patents
Preparation process of waterproof air-permeable moisture-permeable microporous film Download PDFInfo
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Abstract
The invention discloses a preparation process of a waterproof air-permeable moisture-permeable microporous film, which mainly comprises the following steps: step 1, selecting a carrier, and selecting a carrier with air permeability of 3-20 cm 3/cm2The release cloth of/s is used as a carrier, and waterproof treatment is carried out; step 2, controlling the air permeability of the carrier, performing calendaring treatment on the carrier, and controlling the air permeability to be 3-10 cm 3/cm2Within/s; step 3, mixing coating liquid, namely mixing 100 parts of solvent type polyurethane resin, 50-70 parts of DMF (dimethyl formamide), 20-50 parts of nano calcium carbonate, 1.2-1.5 parts of surfactant, 0.5-2 parts of water splashing agent and 0.5-1.5 parts of stripping aid in parts by weight; and step 4, film forming processing, namely uniformly coating the coating liquid on the carrier, solidifying the coating liquid, then washing with water, drying and shaping, and cooling and then stripping to obtain the film. The invention has simple process and low production cost, and effectively ensures the air permeability, moisture permeability and waterproof performance of the polyurethane film.
Description
Technical Field
The invention relates to the field of textiles, in particular to a preparation process of a waterproof air-permeable moisture-permeable microporous film.
Background
The coated composite fabric has the functions of water repellency, moisture permeability, wind resistance and heat preservation, is usually applied to outdoor sport turnout coats, mountaineering ski wear, cold protective clothing and other aspects, is gradually applied to urban outdoor and urban casual clothing in recent years, and often brings stuffy feeling to people.
To improve this problem, it is necessary to increase the moisture and heat vapor exchange capacity of such fabrics without losing the above-mentioned functions. The fabric capable of meeting the requirements in the market at present is formed by compounding a high-molecular waterproof breathable PTFE microporous membrane and base cloth. However, the product processed by the PTFE film has complex processing technology, higher cost and poorer washing fastness, and the PTFE film is not degradable, belongs to a fluorine material, cannot be recycled and pollutes the environment.
It has been proposed to use a urethane resin coating instead, as disclosed in CN101929081A, a high-water-resistance high-pressure-moisture-permeability coated fabric obtained by dry coating by calendering a water repellent treated base fabric, then coating a microporous layer, and finally forming a protective layer on the microporous layer. The fabric obtained by the method has the initial hydrostatic pressure of more than or equal to 7000mmH2O according to ISO8811-1981 standard; according to the method A of GB/T12704-1991, the initial moisture permeability is more than or equal to 5000g/m2.d, although the invention improves the water pressure resistance, the moisture permeability and the washing durability, the problem of air permeability still exists because the water pressure resistance is particularly high, and the processing technology is relatively complicated.
For another example, CN102173154A discloses a windproof and breathable coated fabric, which is prepared by coating a surface layer of polyurethane resin working slurry to form a microporous structure, coating a next working slurry layer, drying, transferring a carrier to obtain a semi-finished product, and finally compounding the semi-finished product with another fabric on one side of a microporous film to form a final product. Although the invention improves the wind resistance and air permeability, the moisture permeability and water pressure resistance are still problematic.
For example, CN103866579A discloses a wet-process coated fabric, in which a two-layer wet-process microporous coating is coated on a fabric, which solves the problems of hard hand feeling and loud noise of a dry-process coating, but actually, due to a secondary coating, air permeability cannot be improved, because a first knife-coated adhesive layer needs to improve adhesion between a nylon fabric and a polyurethane fabric, and water pressure resistance and moisture permeability are improved, but the process conditions for really improving wearing comfort and air permeability are very complicated, and then a breathable fabric is obtained through the secondary wet-process coating, so that there is a great limitation on selection of processing different fabrics.
In order to pursue the above functions, attempts have been made to improve the complex processes using dry coating and wet coating, and although the water pressure resistance, moisture permeability, and softness of touch have been improved, the air permeability, which is really similar to the PTFE function, cannot be effectively improved.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a preparation process of a waterproof air-permeable and moisture-permeable microporous film, which has the advantages of simple process and low production cost and effectively ensures the air permeability, moisture permeability and waterproof performance of a polyurethane film.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
A preparation process of a waterproof air-permeable moisture-permeable microporous film mainly comprises the following steps:
Step 1) selecting a carrier, and selecting a carrier with air permeability of 3-20 cm 3/cm2The release cloth of/s is used as a carrier, and the carrier is subjected to waterproof treatment;
Step 2) controlling the air permeability of the carrier, carrying out calendaring treatment on the carrier subjected to the waterproof treatment, and controlling the air permeability to be 3-10 cm 3/cm2Within/s;
Step 3), proportioning coating liquid, and mixing and stirring 100 parts of solvent type polyurethane resin, 50-70 parts of DMF (dimethyl formamide), 20-50 parts of nano calcium carbonate, 1.2-1.5 parts of surfactant, 0.5-2 parts of water splashing agent and 0.5-1.5 parts of stripping aid according to weight fraction to prepare the film formula;
And 4) film forming processing, namely uniformly coating the coating liquid on the calendered carrier, solidifying the coating liquid, then washing with water, drying and shaping, cooling, peeling the carrier and the solidified coating liquid, and rolling to obtain the film.
Further, the coating liquid also comprises 12 parts of color paste by weight.
Further, the thickness range of the rolled film is 10-35 um, and the cross section of each 1cm of the film is at any point in the thickness direction 2At least 100 ten thousand micropores exist, and the diameter range of the micropores is 1-40 mu m.
Further, the peeling strength range of the carrier and the solidified coating liquid in the step 4 is 0.3-0.8N.
Furthermore, the particle diameter range of the nano calcium carbonate is 0.01-0.1 μm.
Further, the material for water-proof treatment in the step 1 is C 6A water-repellent resin, said C 6The dosage of the waterproof resin is 40 +/-2 g/m 2。
Further, the carrier is plane release paper or low-denier nylon plain cloth.
The invention has the beneficial effects that:
The invention has simple process and low production cost, actually and effectively improves the air permeability of the film, and the film can be compounded into any fabric through points The fabric can be applied to industrial filter materials and has wide application. The film manufactured by the invention is finished by one-time coating of the carrier, has a microporous structure and microporous diameters at the upper part and the lower part >2um, the water pressure resistance, the air permeability and the moisture permeability of the film can be flexibly controlled according to requirements according to process formulas of different proportions, and the water pressure resistance of the film is 300-10000H according to a JIS L1092B method 2O, the air permeability of the film is 0.03 to 2cm3/cm2/s according to JIS L1096, and the moisture permeability is 5000 to 15000g/m according to JIS L1099A 2.24h。
The film has wide application, is environment-friendly and degradable, completely meets the economic development, meets the requirement of people on the wearing comfort of functional textiles, and can be widely applied to urban leisure jackets, outdoor jacket and sports leisure clothes.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention. Specific embodiments of the present invention are given in detail by the following examples.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
A preparation process of a waterproof air-permeable moisture-permeable microporous film mainly comprises the following steps:
Step 1), selecting a carrier, selecting 20D nylon plain weave fabric with air permeability of 3-20 cm3/cm2/s as the carrier, and carrying out waterproof treatment on the carrier by adopting pressing, soaking and rolling modes;
The choice of the base fabric is very important. The original air permeability of the fabric is very low due to over-compaction, and the original air permeability can not be maintained if the film is made; on the contrary too much The open base fabric, even if the gaps between the structures are adjusted by calendering, leads to the penetration of the glue during coating. Therefore, the selected range is set to be 3-20 cm3/cm2/s, and the range is a controllable position for penetration of the coating liquid, otherwise, the range is not air-tight, and the coating glue does not penetrate into the yarn of the base fabric during coating. Before the calendaring treatment, the base cloth is subjected to waterproof resin treatment to endow the base cloth with waterproof performance. Waterproof processing adopts C 6the waterproof resin is used in an amount of 40 +/-2 g/m, and is subjected to high-temperature setting at 150-170 degrees multiplied by 30-40 seconds after treatment to ensure the waterproof performance, the waterproof performance is tested according to JIS L1902, the base cloth treated by the waterproof resin is tested according to JIS L1902, and the waterproof performance can reach more than 80 points after the base cloth is washed for 20 times.
Step 2) controlling the air permeability of the carrier, carrying out calendaring treatment on the carrier subjected to the waterproof treatment, and controlling the air permeability to be 3-10 cm 3/cm2Within/s;
Step 3) proportioning the coating liquid, wherein the film formula is composed of
100 grams of solvent-borne polyurethane resin;
50 g DMF (i.e. N, N-dimethylformamide);
20 g of nano calcium carbonate;
1.2 grams of surfactant;
12 g of color paste;
1 g of water splashing agent;
0.5 g of stripping aid;
The nano calcium carbonate is one of the key technical points of the invention, the diameter of the nano calcium carbonate is controlled to be 0.01-0.1 um, and microporous membranes with the diameter of 0.03-2 mu m can be obtained according to the addition amount of different formulas.
And 4) film forming processing, namely uniformly coating the coating liquid on the calendered carrier, solidifying the coating liquid, then washing with water, drying and shaping, cooling, peeling the carrier and the solidified coating liquid, and rolling to obtain a film, wherein the thickness of the film is 10-35 mu m.
The film and the carrier are also more important to be stripped, and the stripping strength of the solidified film is controlled to be 0.3-0.8N, so that the film cannot be damaged.
The working principle of the embodiment is as follows:
the PU film has micropore structure, endows the product with soft hand feeling and excellent air and moisture permeability function, is the material closest to PTFE film physical property in China at present, the air and moisture permeability and the water pressure resistance of the product of the invention are mainly determined by the size and diameter distribution of micropores, the micropores of the adhesion surface of the film and the carrier are smaller and are arranged more densely, the upper part of the film has relatively larger micropores, a great part of the micropores are through, the continuity is better, the micropore rice film obtained by wet carrier coating is shot by an electron microscope with 1500 high multiplying power, more than 20 micropores can be counted in the range of 30um × 50um at any 5 points, thus obtaining the cross section of any point parallel in the thickness direction, and every 1cm 2More than 125 thousands of micropores exist, and the diameter of each micropore is 2-40 um.
The general air-permeable and moisture-permeable fabric is known to have the ability to transmit moisture, and the general air-permeable and moisture-permeable test is a test of the degree of moisture absorption of an absorbent. The air permeability of the present invention refers to the direct permeability of air under a certain pressure, and the method for testing the permeability of air is the permeability of air. The invention has the general air permeability and moisture permeability, and improves the heat exchange capacity between the hot air of the human body and the outside of the clothes because weak air can pass through. The wind-proof capability is still provided because the air transmission amount is less.
According to the test of GB/T13022-1991 standard, the tensile strength of the microporous membrane prepared by the embodiment is 25-35 mpa, and the elongation at break is 450-550%. The strength of the film is not reduced due to the change of the film making process formula, and the film is suitable for compounding of elastic cloth, so that after a finished product is sewn, the film cannot break along the needle seam when the fabric is stretched due to the low strength of the film. Therefore, the film can be compounded with any textile, no matter woven fabric or knitted fabric, but in order to ensure the air permeability of the obtained fabric finished product, the spot-shaped solvent-free hot melt adhesive needs to be compounded to ensure the air permeability. The film prepared by the invention can be compounded with non-woven fabrics and the like to be used as a filtering material, and can also be printed on the film surface to be made into a two-layer and semi-composite fabric
Example two
The difference between the present embodiment and the first embodiment is that the following process formula is formed:
100 grams of solvent-borne polyurethane resin;
55 g DMF (i.e. N, N-dimethylformamide);
25 g of nano calcium carbonate;
1.3 grams of surfactant;
12 g of color paste;
1.5 g of water splashing agent;
0.5 g of stripping aid; and (4) mixing.
The air permeability of the carrier is controlled to be 3-10 cm after the carrier is used as a waterproof carrier and is subjected to waterproof calendaring 3/cm2And s. Then obtaining the water pressure resistance of the film at 5000H according to the coating process 2O, moisture permeability of 12000g/m 2And 24h, the air permeability is 0.8-1.2 cfm.
EXAMPLE III
The difference between the present embodiment and the first embodiment is that the following process formula is composed:
100 grams of solvent-borne polyurethane resin;
65 g of DMF (i.e.N, N-dimethylformamide);
35 g of nano calcium carbonate;
1.5 grams of surfactant;
12 g of color paste;
0.5 g of water splashing agent;
1 g of stripping aid; and (4) mixing.
The processing conditions are basically the same as those in the first embodiment, and the prepared film has the water pressure resistance of 5000H 2O, moisture permeability of 14500g/m 2And the air permeability is 2-2.5 cfm for 24 hours.
Example four
The difference between the present embodiment and the first embodiment is that the following process formula is composed:
100 grams of solvent-borne polyurethane resin;
55 g DMF (i.e. N, N-dimethylformamide);
30 g of nano calcium carbonate;
1.5 grams of surfactant;
12 g of color paste;
2 g of water splashing agent;
0.5 g of stripping aid; and (4) mixing.
Preparing a film according to the same process conditions as in example one, the water pressure resistance is 10000H 2O, moisture permeability of 8000g/m 224h, air permeability of 0.2 cfm.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A preparation process of a waterproof air-permeable moisture-permeable microporous film is characterized by comprising the following steps: the method mainly comprises the following steps:
Step 1) selecting a carrier, and selecting a carrier with air permeability of 3-20 cm 3/cm2The release cloth of/s is used as a carrier, and the carrier is subjected to waterproof treatment;
Step 2) controlling the air permeability of the carrier, carrying out calendaring treatment on the carrier subjected to the waterproof treatment, and controlling the air permeability to be 3-10 cm 3/cm2Within/s;
Step 3), proportioning coating liquid, and mixing and stirring 100 g of solvent type polyurethane resin, 65 g of DMF (dimethyl formamide), 35 g of nano calcium carbonate, 1.5 g of surfactant, 12 g of color paste, 0.5 g of water splashing agent and 1 g of stripping aid according to weight gram to prepare the film formula;
And 4) film forming processing, namely uniformly coating the coating liquid on the calendered carrier, solidifying the coating liquid, washing with water, drying and shaping, cooling, peeling the carrier from the solidified coating liquid, and rolling to obtain the film, wherein the peeling strength range of the carrier and the solidified coating liquid is 0.3-0.8N.
2. The preparation process of the waterproof air-permeable moisture-permeable microporous film according to claim 1, characterized in that: the thickness range of the rolled film is 10-35 mu m, and the cross section of each 1cm of the film is at any point in the thickness direction 2At least 100 ten thousand micropores exist, and the diameter range of the micropores is 1-40 mu m.
3. The preparation process of the waterproof air-permeable moisture-permeable microporous film according to claim 1, characterized in that: the particle diameter range of the nano calcium carbonate is 0.01-0.1 mu m.
4. The preparation process of the waterproof air-permeable moisture-permeable microporous film according to claim 1, characterized in that: the material for water prevention and treatment in the step 1) is C 6A water-repellent resin, said C 6The dosage of the waterproof resin is 40 +/-2 g/m 2。
5. The preparation process of the waterproof air-permeable moisture-permeable microporous film according to claim 1, characterized in that: the carrier is plane release paper or low-denier nylon plain weave.
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| CN104742480B (en) * | 2015-04-17 | 2018-02-16 | 广州钰琪璐塑胶科技有限公司 | A kind of preparation method of Waterproof Breathable TPU fabrics |
| CN106178971A (en) * | 2016-08-18 | 2016-12-07 | 嘉兴德永纺织品有限公司 | The manufacture method of wet method micro-porous film |
| CN107881796A (en) * | 2016-09-30 | 2018-04-06 | 嘉成工业股份有限公司 | Can moisture absorbing and sweat releasing and the function cloth processing method kept out the wind |
| CN107326692A (en) * | 2017-05-25 | 2017-11-07 | 无锡金双面料科技有限公司 | A kind of processing technology of waterproof ventilating type stamp yarn-dyed fabric |
| CN108047696B (en) * | 2017-12-26 | 2021-02-05 | 东莞市雄林新材料科技股份有限公司 | TPU (thermoplastic polyurethane) film material for micro-pore filtration and preparation method thereof |
| TWI685424B (en) * | 2018-10-31 | 2020-02-21 | 聚紡股份有限公司 | Textile |
| CN111576055A (en) * | 2019-02-15 | 2020-08-25 | 纳智源科技（唐山）有限责任公司 | Waterproof breathable fabric and preparation method thereof |
| CN110757922B (en) * | 2019-11-22 | 2023-08-01 | 厦门当盛新材料有限公司 | Composite fabric and production method thereof |
| CN110983810A (en) * | 2019-12-29 | 2020-04-10 | 利郎(中国)有限公司 | High-moisture-permeability breathable fabric and preparation method thereof |
| CN111572106A (en) * | 2020-05-20 | 2020-08-25 | 军事科学院系统工程研究院军需工程技术研究所 | Reusable medical protective clothing fabric with high moisture permeability and high barrier property and preparation method thereof |
| CN111533934A (en) * | 2020-05-20 | 2020-08-14 | 军事科学院系统工程研究院军需工程技术研究所 | High-moisture-permeability high-barrier medical disposable protective clothing fabric and preparation method thereof |
| CN111941994A (en) * | 2020-08-05 | 2020-11-17 | 苏州世韩纺织整理有限公司 | Water pressure resistant textile and preparation process thereof |
| CN113373700A (en) * | 2021-06-15 | 2021-09-10 | 苏州奈米新纺织科技有限公司 | Coating method of elastic warp knitted fabric |
| CN113386448A (en) * | 2021-06-28 | 2021-09-14 | 苏州启燕新材料科技有限公司 | Preparation method of medical protective fabric with high moisture permeability |
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| CN101768872B (en) * | 2010-01-26 | 2012-08-22 | 吴新民 | Micro porous dry-method waterproof and moisture-permeable fabric and production method thereof |
| CN102168379B (en) * | 2011-03-11 | 2013-03-06 | 上腾新材料科技（苏州）有限公司 | Polyurethane polymer material with high water pressure resistance and high moisture permeability |
| CN103866579A (en) * | 2012-12-14 | 2014-06-18 | 东丽纤维研究所（中国）有限公司 | Ventilating waterproof moisture-permeable wet-process coating fabric, and processing method and application thereof |
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