Integrated barrier-free flexible polyurethane hot-wet film forming technology

Abstract

The invention discloses an integrated barrier-free flexible polyurethane hot-wet film forming technology, and relates to the technical field of film forming technologies, the reaction strength of a polyurethane prepolymer and water molecules is controlled through a fine process, a dense and high-strength cross-linked three-dimensional network film is prepared, and the material has high ductility, high air permeability and low wet resistance, and can be applied to the field of film forming. Dynamic balance of moisture can be realized to the greatest extent, sweat accumulation, overheating and temperature loss in outdoor exercises are avoided, stuffiness is avoided, physiological comfort in general exercises is excellent, crease resistance of the fabric can be effectively improved due to high ductility of the material, electrostatic charge accumulation can be effectively reduced, large electrostatic pressure difference is avoided, and the fabric is comfortable to wear. And an electric arc phenomenon of cleaving is generated.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of film forming technology, in particular to integrated flexible polyurethane heat and humidity film forming technology without obstruction. BACKGROUND

[0002] At present, cold-protecting clothes (such as low-transparency film, medium-transparency film and high-transparency film) on the market generally have the disadvantages of poor air permeability, poor physiological comfort (excessive moisture resistance), difficulty in drying after being wet or washed, arc caused by static electricity accumulation and poor wrinkle resistance.

[0003] Long-term wearing will cause conditions such as stuffiness, sweat accumulation, rapid temperature loss and electric shock feeling, greatly reducing the comfort of the clothes, especially in the life scene of outdoor activities, overheat and temperature loss will occur, which will greatly impact the immunity of the human body, and even cause syncope. SUMMARY

[0004] Therefore, in order to solve the above problems, the application provides integrated flexible polyurethane heat and humidity film forming technology without obstruction.

[0005] The application is implemented by constructing integrated flexible polyurethane heat and humidity film forming technology without obstruction, which comprises the following steps: Step 1, material preparation; First, polyurethane prepolymer prepared by polyol and polyisocyanate through condensation reaction is prepared, which has a repeating structural unit of urethane segment; the chemical formula is (NHCOO)n, and the molecular formula contains polar urethane group (-NHCOO-) and isocyanate group (-NCO-); Then, modified organic nanometer silicon-based powder with a heat-sensitive source of 37.5 DEG C is selected, and an emulsifier is added to prepare stable silica gel emulsion, wherein the particle size of the silica gel emulsion is less than 100 nm, and the silica gel emulsion is uniformly coated on a PET carrier, and a heat-sensitive active PET carrier is prepared after baking; Meanwhile, a casting head centrifugal carrier film forming machine with a micro-tension system is selected for inspection and preheating; Step 2, heat and humidity microporous film forming process; First, the polyurethane prepolymer capped with isocyanate (-NCO) is prepared into a paste and placed in a sealed container for electric heating melting and low-speed stirring; the pore size of the wet microporous film can be controlled according to actual requirements, and the colloid viscosity is controlled by adjusting the temperature of the heating pipe, that is, the lower the viscosity, the faster the reaction, the larger the pore size, and the higher the viscosity, the slower the reaction, and the smaller the pore size; Then, the colloid uniformity and thickness are controlled by the flow rate and flow of the casting head of the casting head centrifugal carrier film forming machine, so as to realize the three-dimensional network space attribute of the microporous film, that is, low wind resistance and high air permeability or medium wind resistance and low air permeability. Finally, the polyurethane prepolymer fluid flows through the gaps in the coating rollers onto the heat-sensitive active PET carrier, where it reacts with water molecules inside the humid heat chamber. Specifically, the -NCO groups react with water molecules to generate amino groups (-NH2) and release CO2. The newly generated amino groups further react with -NCO to form a urea bond (-NH-CO-NH-) crosslinking network, thus forming a polyurethane prepolymer film. The degree of dislocation and volatilization of carbon dioxide determines the microporous pore size and porosity. After the reaction is complete, the film is baked in a hot air oven. During the reaction of the polyurethane prepolymer, some of the 37.5° thermosensitive modified organic nano-silicon adheres to and penetrates into the membrane material, giving the membrane material excellent slipperiness and thermosensitive moisture conductivity.

[0006] Preferably, the humidity of the heat chamber is limited to the range of 50%-55%, so that the reaction between the polyurethane prepolymer and water molecules will not be too violent, the microporosity and pore size of the membrane material are easier to control, and the membrane material has better toughness.

[0007] Preferably, the baking temperature of the hot air oven is 105-115 degrees Celsius.

[0008] Preferably, the gap distance of the coating rollers is controlled within the range of 50-500μm.

[0009] Preferably, the centrifugal carrier film forming machine of the casting head uses deionized water to control its humidity between 50-65%RH and its temperature between 90-115 degrees.

[0010] The present invention has the following advantages: By improving the integrated, unobstructed flexible polyurethane thermo-wet film formation technology, the present invention has the following improvements compared with similar equipment: The integrated, unobstructed, flexible polyurethane thermo-humidity film-forming technology of this invention uses precise process control to manage the reaction intensity between polyurethane prepolymer and water molecules, preparing a dense, high-strength cross-linked three-dimensional network film. The material has high extensibility, high breathability, and low moisture resistance, which can maximize the dynamic balance of moisture, avoiding sweat accumulation, overheating, and hypothermia during outdoor sports, eliminating stuffiness and providing excellent physiological comfort during general exercise. The high extensibility of this material can effectively improve the wrinkle resistance of the fabric, and at the same time, it can effectively reduce the accumulation of static charge, avoiding the formation of large static pressure differences and the crackling arcing phenomenon. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the temperature-regulating enthalpy value of the 75D low-elasticity plain weave material of the present invention; Figure 2 This is a schematic diagram of the temperature-regulating enthalpy value of the 75D high-elasticity plain weave material of the present invention; Figure 3 This is a schematic diagram of the temperature-regulating enthalpy value of the 50D elastic plain weave material of the present invention; Figure 4 This is a schematic diagram of the air permeability barrier rate of the present invention at different thicknesses; Figure 5 This is a schematic diagram of the moisture resistance at different thicknesses according to the present invention. Detailed Implementation

[0012] The following is in conjunction with the appendix Figures 1-5 The principles and features of the present invention are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0013] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0014] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The embodiments of this invention will now be described according to its overall structure.

[0015] Example 1:

[0016] Please see Figures 1-5 The integrated, unobstructed flexible polyurethane thermo-wet film formation technology of the present invention includes the following steps: Step one, material preparation; first, prepare the polyurethane prepolymer made by polyol and polyisocyanate through condensation reaction, with the repeating structural unit of urethane segment, its chemical formula is (NHCOO)n, the molecular formula contains polar urethane group (-NHCOO-) and isocyanate group (-NCO-); then select 37.5° as the modified organic nanometer silicon-based powder of heat-sensitive source, add emulsifier to prepare stable silica emulsion, here the silica emulsion particle size is less than 100 nm, uniformly coated on the PET carrier, baked to form a heat-sensitive active PET carrier; At the same time, select the casting head centrifugal carrier film forming machine with micro-tension system for inspection and preheating; The casting head centrifugal carrier film forming machine uses deionized water to control the humidity between 50-65%RH and the temperature between 90-115 degrees; Step two, heat and humidity micro-porous film forming process; first, the polyurethane prepolymer capped with isocyanate (-NCO) is prepared into a paste and placed in a sealed container for electric heating melting and low-speed stirring; The pore size of the wet micro-porous film can be controlled according to actual needs, by adjusting the temperature of the heating tube to control the viscosity of the colloid, that is, the lower the viscosity, the faster the reaction, the larger the pore size, the higher the viscosity, the slower the reaction, and the smaller the pore size; Then, the flow rate and flow of the casting head of the casting head centrifugal carrier film forming machine are controlled to realize the uniformity and thickness of the colloid, to realize the three-dimensional network space attribute of the micro-porous film, that is, low windproof and high air permeability or medium windproof and low air permeability; Finally, the polyurethane prepolymer fluid flows through the gap of the coating roller to the heat-sensitive active PET carrier, and reacts with the water molecules in the humid heat box, -NCO group reacts with water molecules to generate amino (-NH2), and releases CO2, the newly generated amino further reacts with -NCO to form a cross-linked network of urea bond (-NH-CO-NH-), that is, polyurethane prepolymer film forming; Here, the humidity of the humid heat box is limited to 50%-55%, the reaction between the polyurethane prepolymer and the water molecules will not be too violent, the microporosity and pore size of the film material are more easily controlled, and the toughness of the film material is better, the gap distance of the coating roller is controlled within the range of 50-500μm, and the degree of misplacement of carbon dioxide determines the microporous pore and porosity, after the reaction is completed, the film is baked through the hot air oven, and the baking temperature of the hot air oven is 105-115 degrees; During the reaction of the polyurethane prepolymer, part of the 37.5° modified organic nanometer silicon is attached to and penetrates into the film material, making the film material have excellent smoothness and heat-sensitive moisture conductivity.

[0017] Example two:

[0018] Please refer to Figures 1-5Compared with the first embodiment, the thermal and humid film forming technology provided by the embodiment is basically consistent with the method of the first embodiment, and the difference is that: according to the film forming process, the co-function superposition is more smooth, and the high physiological comfort film with high air permeability and different functions is prepared according to different application scenarios, the oil-wet PCM phase change microcapsule is added in the polyurethane prepolymer to form a thermal and humid balance temperature regulating film, the temperature regulating enthalpy value is 8-12j / g, the temperature regulating amplitude is 17-30 degrees, and the wet resistance is 3.66Pa m2 / W, so that the excellent intelligent temperature regulating effect can be realized, the wet resistance is in the extremely comfortable interval, and the physiological comfort is better.

[0019] The temperature regulating enthalpy value of the material with different thicknesses is tested as shown in Figure 1 、 Figure 2 and Figure 3 .

[0020] Embodiment three:

[0021] Please refer to Figures 1-5 Compared with the first embodiment, the thermal and humid film forming technology provided by the embodiment is basically consistent with the method of the first embodiment, and the difference is that: the polyamide-based graphene master batch is added in the polyurethane prepolymer, the compatibility is good, the mixing is uniform, and the physiological comfort graphene film material prepared has excellent antibacterial performance and heat storage performance.

[0022] The application provides an integrated non-obstructive flexible polyurethane thermal and humid film forming technology by improvement, the reaction strength between polyurethane prepolymer and water molecules is controlled through fine process, and a dense high-strength cross-linked three-dimensional network film is prepared. Figure 4 The application has high air permeability and can be widely applied to physiological comfort film type windbreaker and cold-weather clothing. Figure 5 The application has high ductility and low wet resistance, and can realize dynamic balance of moisture to the maximum extent, avoid sweat accumulation, overheating and temperature loss during outdoor sports, have no stuffy feeling, and have excellent physiological comfort during general sports.

[0023]

[0024] Table 1: air permeability and barrier rate; The above test data can see that the modified PU non-barrier film material has an air permeability barrier rate of less than 40%, and the air permeability performance is far superior to the micro-porous film material popular in the domestic and foreign markets, and the air permeability barrier rate is only about 45% of other micro-porous film materials, which can ensure windproof and provide more channels for timely dissipation of excess heat, and the experience is extremely strong.

[0025] Good physiological comfort: the wet resistance test data of the same material with different thicknesses and different elasticities are compared as follows:

[0026] Table 2: Wet resistance; The above data can see that the modified PU non-barrier film material (blue column) has very small wet resistance, which is lower than the extremely comfortable interval specified by the European Union, that is, the RET value is less than 6 m2.pa / w. After the film is formed by the improved process, the touch of the fabric is not affected, and the wrinkle resistance of the fabric is improved to a certain extent, the core reason is that the film material has high ductility, and can be widely applied to children's clothes, men's and women's clothes, sports clothes and outdoor inner thermal insulation. It is particularly outstanding in windproof jackets, cold-protective clothes in autumn and winter.

[0027] The above shows and describes the basic principles and main features of the present application and the advantages of the present application, and the standard parts used in the present application can be purchased from the market, and the special-shaped parts can be ordered according to the description and the drawings, and the specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art, the mechanical parts and equipment adopt conventional types in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail here.

[0028] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An integrated, unobstructed, flexible polyurethane thermal humidification film forming technology characterized by: Comprising the following steps: Step one, material preparation; First, prepare the polyurethane prepolymer made by polyol and polyisocyanate through condensation reaction, which has repeating structural units of urethane segments; Its chemical formula is (NHCOO)n, and the molecular formula contains polar urethane groups (-NHCOO-) and isocyanate groups (-NCO-); Then, select 37.5° as the modified organic nanometer silicon-based powder of the heat-sensitive source, add emulsifier to prepare stable silica emulsion, where the silica emulsion particle size is less than 100 nm, uniformly coated on the PET carrier, and baked to form a heat-sensitive active PET carrier; At the same time, select a casting head centrifugal carrier film forming machine with a micro-tension system for inspection and preheating; Step two, heat and humidity micro-porous film forming process; First, the polyurethane prepolymer capped with isocyanate (-NCO) is prepared into a paste and placed in a sealed container for electric heating melting and low-speed stirring; The pore size of the wet-state microporous membrane can be controlled according to actual needs by adjusting the temperature of the heating tube to control the viscosity of the colloid, that is, the lower the viscosity, the faster the reaction, the larger the pore size, and the higher the viscosity, the slower the reaction, the smaller the pore size; Then, the uniformity and thickness of the colloid are controlled by the flow rate and flow of the casting head of the casting head centrifugal carrier film forming machine to realize the three-dimensional network space properties of the microporous membrane, that is, low wind resistance and high air permeability or medium wind resistance and low air permeability; Finally, the polyurethane prepolymer fluid flows through the gap of the coating roller to the heat-sensitive active PET carrier and reacts with the water molecules in the humid heat box, that is, the -NCO group reacts with water molecules to generate amino (-NH2), and CO2 is released, the newly generated amino further reacts with -NCO to form a cross-linked network of urea bond (-NH-CO-NH-), that is, the polyurethane prepolymer film forming; The degree of misplacement of carbon dioxide determines the microporous porosity and porosity, and after the reaction is complete, the film is baked in a hot air oven; During the reaction of the polyurethane prepolymer, part of the 37.5° heat-sensitive modified organic nanometer silicon adheres to and penetrates into the film material, making the film material have excellent smoothness and heat-sensitive moisture conductivity.

2. The integrated non-restrictive flexible polyurethane hot-moisture film forming technology according to claim 1, characterized in that: The humidity of the humid heat box is limited to 50%-55%, the reaction of the polyurethane prepolymer with water molecules is not too violent, the microporosity and pore size of the film material are more easily controlled, and the toughness of the film material is better.

3. The integrated non-restrictive flexible polyurethane thermo-humid film forming technology according to claim 2, characterized in that: The baking temperature of the hot air oven is 105-115 degrees.

4. The integrated non-restrictive flexible polyurethane thermo-humid film forming technology according to claim 3, characterized in that: The gap distance of the coating roller is controlled within the range of 50-500 μm.

5. The integrated non-restrictive flexible polyurethane thermo-humid film forming technology according to claim 4, characterized in that: The casting head centrifugal carrier film forming machine uses deionized water to control the humidity between 50-65% RH and the temperature between 90-115 degrees.

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