JPS5922824B2 - Breathable coated cloth and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a breathable coated fabric and its manufacturing process.

The breathable coating fabric is made by forming a microporous polyurethane layer on a base fabric made of woven fabric, unevenly woven fabric, non-woven fabric, etc., and ensures air circulation through the micropores formed in the polyurethane layer. It is something to do.

Such breathable coated fabrics usually have very small ventilation holes formed in the polyurethane layer and are treated with water repellent treatment, making them both breathable and waterproof, making them suitable for use in lane coats, various sportswear, and backpacks. It is widely used as a material for manufacturing cloth products such as.

Conventionally, when manufacturing the above-mentioned breathable coated fabric, a polyurethane resin solution (one-component polyurethane resin solution) is partially or completely impregnated into the base fabric, and the solvent is eluted with an eluent such as water. It was used to solidify polyurethane resin liquid.

When producing a coated fabric using the above-described production method, in order to improve the peel strength between the base fabric and the polyurethane resin layer, the polyurethane resin solution must penetrate into the base fabric in a larger amount. However, in this case, the polyurethane resin completely fills the gaps in the base fabric, resulting in a disadvantage that the air permeability of the manufactured coating fabric decreases and the texture is impaired. on the other hand,
If the penetration of the polyurethane resin liquid into the base fabric is small, good air permeability and feel are ensured, but the peel strength is poor and durability is lacking. In order to balance both breathability and durability appropriately, a water-repellent cloth is used, and an acrylic polymer layer is intermittently formed on this cloth to serve as an adhesive layer, and a one-component polyurethane resin is used. There is also a method (Japanese Patent Application Laid-Open No. 56-26077) of manufacturing a breathable coated cloth by immersing it in an eluate while suppressing the penetration of the solution into the cloth due to its water repellency. The coated cloth has air permeability and texture by intermittent formation of an acrylic polymer adhesive layer, and has a somewhat satisfactory performance. Since the adhesion between layers is not as good as between polyurethane resin and cloth or between polyurethane resins, the peel strength is at most 0.4Kgf/CTL (according to past experience, the peel strength is at least 0.4Kgf/CTL for wear etc.). 7Kgf/c
! n), which was so low that it could hardly be put to practical use, and there was little point in providing an adhesive layer.

In order to ensure the adhesive strength between the cloth body and the adhesive layer, or the polyurethane resin layer and the adhesive layer, it is preferable to use polyurethane resin for the adhesive layer as well. If an adhesive layer is used, when a one-component polyurethane resin solution is applied onto this base fabric, the adhesive layer will be dissolved by the solvent of the resin solution, and the gaps between the partially formed adhesive layers will be filled. , ventilation cannot be ensured.

For this reason, conventionally it has been impossible to use polyurethane resin for this adhesive layer. The object of the present invention is to provide a breathable coated fabric and a method for producing the same that are free from these drawbacks.

Specifically, the object of the present invention is to provide a coated cloth that has a good feel and air permeability and extremely excellent peel strength, and a method for producing the same. Therefore, the breathable coated fabric according to the present invention has fine ventilation holes on the base fabric in which a two-component polyurethane resin layer is partially provided on at least one side of the fabric that has not been subjected to water repellent treatment. A one-component polyurethane resin layer is provided, and the fabric body and the one-component polyurethane resin layer are bonded and integrated with the two-component polyurethane resin layer through a crosslinking reaction of the two-component polyurethane resin. That is. In addition, the method for producing a breathable coated cloth according to the present invention includes partially applying a two-component polyurethane resin solution to a cloth that has not been subjected to water-repellent treatment, drying and aging, and then applying the two-component polyurethane resin solution. A one-component polyurethane resin solution mixed with powder that dissolves in the eluate but not in the solvent is applied onto a base fabric with a semi-crosslinked two-component polyurethane resin layer, dried, and aged. The two-component polyurethane resin layer is completely crosslinked, and the two-component polyurethane resin layer and the fabric body are bonded and integrated with the one-component polyurethane resin layer, and then immersed in an eluent to form fine ventilation holes. It is characterized by causing the formation of

According to the second method for producing a breathable coated cloth according to the present invention, a two-component polyurethane resin solution is partially applied to a cloth that has not been subjected to water-repellent treatment, dried, and aged. A one-component polyurethane resin containing powder that dissolves in the eluate but does not dissolve in the solvent of the urethane resin solution, on a base fabric with a semi-crosslinked two-component polyurethane resin layer made of a liquid polyurethane resin liquid. The solution is applied, then dried and aged to bring the two-component polyurethane resin layer into a crosslinked state, thereby adhering and integrating the one-component polyurethane resin layer and the cloth body with the two-component polyurethane resin layer. The method is characterized in that a one-component polyurethane resin solution that can be wet-coagulated is mixed with a powder that dissolves in the solvent of the urethane resin solution but does not dissolve in the solvent of the urethane resin solution, and then immerses it in the eluate.

According to the coated cloth according to the present invention, the one-component polyurethane resin layer is integrated through a crosslinking reaction of the two-component polyurethane resin layer partially provided on the cloth body, so that the moisture permeability is 2000VTrI24Hr or more. The peel strength is 0.7~1.5KgfA71L.
It has the advantage of being extremely large.

Further, according to the method for manufacturing a coated cloth according to the present invention,
Since the adhesive layer is a two-component polyurethane resin layer in a semi-crosslinked state, the adhesive layer is not affected by the solvent of the one-component polyurethane resin solution, and has the advantage that the coated fabric can be effectively manufactured. be.

The present invention will be explained in more detail.

The breathable coated fabric according to the present invention basically consists of a base fabric in which a two-component polyurethane resin layer is partially provided on at least one side of a fabric that has not been subjected to water-repellent treatment, and a one-component polyurethane resin layer is provided thereon. However, basically any cloth body may be used as the cloth body used in the coating cloth according to the present invention.

For example, it can be a woven fabric, a knitted fabric, a non-woven fabric, etc. of synthetic fibers or natural fibers. A two-component polyurethane resin solution is made by adding a crosslinking agent, a catalyst, etc. to a polyurethane prepolymer whose main components are isocyanate and polyol, but in the present invention, this two-component polyurethane resin solution is basically limited. Not done. For example, the isocyanate component of the polyurethane polypremer includes diphenylmethane-4,4'-diisocyanate, diphenyl-dimethylmethane-4,4'-diisocyanate,
Phenylene-1,4-diisocyanate, 2.Z.6.
6'-tetramethyl-diphenylmethane-4,4'-diisocyanate, diphenyl-4,4'-diisocyanate, diphenyl ether-4,4'-diisocyanate or derivatives substituted with alkyl, alkoxy or halogen, toluylene-1 2,4- and -2,6-diisocyanates or commercially available mixtures thereof, 2,4-diisopropylphenylene-1,3-diisocyanate, m-xylylene diisocyanate, p-xylylene diisocyanate and α・α・d - One or more types of d-tetramethyl-p-xylylene diisocyanate can be used, and as the polyol component, all kinds of polyester polyols and polyether polyols can be used. The polyurethane prepolymer may be an isocyanate-terminated prepolymer or a hydroxyl-terminated bleed polymer.

Examples of crosslinking agents that can be used include trifunctional or higher functional polyisocyanates, or hydroxyl compounds such as ethylene glycol, propylene glycol, butane-1,4-diol, hexane-2,5-diol,
・2-dimethyl-propane-1,3-diol, hexane-1,6-diol, 2-methylhexane-1,6-
Diol, 2,2-dimethylhexane-1,3-diol, p-bis-hydroxymethyl-cyclohexane, 3
-Methyl-pentane-1,4-diol and 2,2-diethyl-propane-1,3-diol are used.

Furthermore, tertiary amines, organic compounds, organic lead compounds, etc. are used as catalysts.

The two-component polyurethane resin layer is partially provided on the cloth, and "partially" here means that the two-component polyurethane resin layer is not provided on the entire surface of the cloth without gaps.

For example, the polyurethane layer can be provided on the cloth body in the form of dots, nets, lines, or the like. Furthermore, the type of one-component polyurethane resin layer is not limited in the present invention.

Conventionally, any urethane polymer can be used for this type of coating fabric. For example, it can be a polyester-based or polyether-based urethane polymer. Next, a method for manufacturing the coated cloth of the present invention will be explained.

According to the method for manufacturing a coated cloth according to the present invention, first, a two-component urethane resin solution is partially applied to a cloth body that has not been subjected to water repellent treatment as described above.

The method of application is not limited, for example, 70~
It can be applied in dots with a 120 mesh gravure roll.

In addition, the application amount of the two-component polyurethane resin solution is 10 to 30
9/M2 is preferred.

If it is less than 109/A, the adhesive strength with the fabric body or the upper one-component polyurethane resin layer will decrease;
If you go beyond A, there will be gaps such as dots, lines, nets (i.e.
This is because the two-component polyurethane resin solution will spill over into areas (to which the two-component polyurethane resin solution has not been applied) and will close this gap.

In this way, the cloth coated with the two-component polyurethane resin solution is dried. Drying is preferably at 70°C to 150°C.
Do this for 0 seconds to 15 minutes. If the temperature is less than 70°C, the solvent will not volatilize sufficiently, and the reaction will not proceed sufficiently in the next ripening process.If it exceeds 150°C, the reaction will proceed too quickly, resulting in a preferable semi-crosslinked state. I can't go back. Further, if the drying time is less than 30 seconds, the solvent will not be sufficiently volatilized and the reaction will not proceed sufficiently in the aging process, and if it exceeds 15 minutes, the reaction will proceed too quickly, resulting in a desirable semi-crosslinked state. This is because it is difficult to obtain. Next, the cloth thus dried is aged.

That is, it is brought into a semi-crosslinked state, and this aging is preferably carried out by leaving it to stand in a temperature range of room temperature to 70°C for up to 48 hours. This is because if the temperature exceeds 70°C, the reaction proceeds too quickly and it is difficult to obtain a preferable semi-crosslinked state.

Furthermore, if the aging time exceeds 48 hours, the uncrosslinked resin will disappear, resulting in poor adhesive strength.

In this case, the degree of crosslinking of the two-component polyurethane resin is 30 to 7.
Preferably it is 0%. If it is less than 30%, it will be affected by the solvent of the one-component polyurethane resin solution and there will be no point in providing a partial adhesive layer, and if it exceeds 70%, the adhesive force with the one-component polyurethane resin layer will decrease. Because it does.

The base fabric used in the present invention is manufactured through the above series of steps, but is it possible to manufacture this base fabric by repeating the above series of steps, excluding the aging step, multiple times? preferable.

That is, it is preferable to repeat the coating-drying process multiple times and then ripen. In this case, the preferred total amount of the two-component polyurethane resin solution to be applied is 10 to 309/wl. In this way, by repeating the series of steps described above, the amount of resin liquid applied per time is reduced, which prevents the situation where the voids between partially applied resin layers are filled with resin during the coating process. This can further ensure air permeability. Next, a one-component polyurethane resin solution is applied onto such base fabric.

The urethane polymer in the one-component polyurethane resin solution is as described above, and the solvent may include one or more of dimethylformamide, ethyl acetate, methyl ethyl ketone, acetone, toluhole, butyl acetate, methyl isobutyl ketone, xylene, etc. It can be used effectively.

The powder that does not dissolve in the solvent but dissolves in the eluate is added to this one-component polyurethane resin solution in order to form fine air holes in the one-component polyurethane resin layer.

Such powder may be inorganic or organic as long as it satisfies the above conditions. For example, one or more of sodium carbonate, sodium bicarbonate, potassium bicarbonate, sodium chloride, calcium chloride, sodium nitrate, calcium nitrate, sugar, phenol, sulfosalicylic acid, and the like can be used. The amount of this powder added is 10 to 1 part by weight per 100 parts by weight of one-component polyurethane resin solution.
00 parts by weight is preferred. If it is less than 10 parts by weight, few micropores will be formed, resulting in poor air permeability, and if it exceeds 100 parts by weight, the proportion of pores in the one-component polyurethane resin layer will increase, impairing the strength of the film. It is from.

The method of applying this one-component polyurethane resin solution onto the base fabric is basically not limited.

It can be applied with a doctor knife, roll coater, etc. The coating amount is preferably 10 to 200 g/M2.
If it is less than 109/i, the adhesive strength will be poor, and if it is less than 20
This is because if it exceeds 09/A, the wind storm and ventilation will deteriorate.

The optimum range is 20 to 1509/i. After applying the one-component polyurethane resin solution to the base fabric in this manner, it is dried and then aged.

Drying is preferably carried out at 70°C to 150°C for 30 seconds or more.

If the temperature is less than 70°C, the solvent will not be sufficiently volatilized and the reaction will not proceed sufficiently in the next aging step, while if it exceeds 150°C, the polyurethane resin layer will deteriorate.

Further, if the drying time is less than 30 seconds, the reaction will not proceed sufficiently in the aging step.

Aging is preferably carried out at a temperature of room temperature to 150° C. for up to 72 hours.

This is because if the aging temperature exceeds 150°C, the polyurethane resin layer will deteriorate. Further, even if the aging time exceeds 72 hours, the crosslinking reaction is still completed, which is economically disadvantageous.

According to the present invention, there is further added a step of applying a one-component polyurethane resin solution having the same or somewhat different composition as the one-component polyurethane resin solution described above onto the integrated one-component polyurethane resin layer. I can do it. In this case, it is preferable to apply a one-component polyurethane resin solution at a coating weight of 10 to 809/m2 on the first layer, and after drying and aging, to a coating weight of 150 to 4009/m2. If the coating amount of the first layer one-component polyurethane resin solution is less than 109/M, the adhesive force will be poor, while if it exceeds 809/M, the texture will be impaired. Further, if the second layer polyurethane resin solution is less than 1509/m'', the strength of the one-component polyurethane resin layer will be insufficient, whereas if it exceeds 4009/m'', air permeability will be impaired.

By providing the second layer in this manner, the feel of the coated cloth is significantly improved.

Next, such a cloth is immersed in an eluent.

The eluent may be water or one or more types of alcohols such as methanol and ethanol. By immersing the cloth in this manner, the mixed powder is eluted together with the solvent in the one-component polyurethane resin solution, and a polyurethane layer having micropores is formed. When a second polyurethane resin layer is provided, the first and second layers are integrated by the action of the solvent.

Then, according to the invention, optionally from 100C to 140C.
The eluate can be completely dried by hot air treatment at a temperature of 40 to 509/Trl, and then a water repellent can be applied to improve the waterproof property. As the water repellent, fluorine-based water repellents and silicone-based water repellents can be effectively used. In addition, following the above treatment, at a temperature of about 150°C for 30 seconds ~
You can also bake for 2 minutes.

Next, examples of the present invention will be described.

Example 1 A two-component urethane resin solution of Formulation 1 was applied twice on a 210D (denyl) nylon oxford fabric using a 70 mesh gravure roll coater, and dried at 110°C for 40 seconds each time. Ivy.

The coating amount of formulation 1 at this time was 22.59/M2 (Wet)
It was hot. After aging this at 25℃ for 24 hours,
The one-component urethane resin solution of formulation 2 was applied onto the two-component urethane resin layer using a doctor knife, and dried at 120° C. for 3 minutes. At this time, the amount of urethane resin solution applied in Formulation 2 was 90f! /It was wet. 25 after this
After aging at 100°C for 24 hours, it was washed with 60°C water for 1 hour, squeezed lightly, and dried at 100°C for 5 minutes. For comparison, a product without the application of a two-component polyurethane resin solution was prepared and its characteristics were measured. The results are shown in Table 1. Formulation 1 Example 2 Example 1 on 210D1 nylon oxford woven fabric
In the same way, mix the two-component urethane resin solution of Formulation 1 and Formulation 2.
A one-component urethane resin solution was prepared and dried.

Furthermore, 2109/wl of one-component urethane resin solution of formulation 3 was applied on top of this using a doctor knife, and water/DMF (9
5/5) for 5 minutes, then washed in water at 60°C for 1 hour, squeezed lightly, and dried at 100°C for 5 minutes. The results of Blend 3 were as shown in Table 2.

Claims (1)

[Claims] 1. A one-component polyurethane resin layer having fine ventilation holes on a base fabric in which a two-component polyurethane resin layer is partially provided on at least one side of a fabric that has not been subjected to water-repellent treatment. the cloth body and the one-component polyurethane resin layer,
A breathable coated fabric characterized in that it is bonded to the two-component polyurethane resin layer through a crosslinking reaction of the two-component polyurethane. 2 The cloth body and the one-component polyurethane resin layer have a degree of crosslinking of 30 to 30 with the partially provided two-component polyurethane resin layer.
A breathable coated fabric according to claim 1, characterized in that the fabric is bonded by completely crosslinking 70% two-component polyurethane. 3. The fabric body and the one-component polyurethane resin layer are bonded by applying a one-component polyurethane resin solution onto a base fabric partially provided with a semi-crosslinked two-component polyurethane resin, and drying and aging. A breathable coated fabric according to claim 1 or 2, characterized in that: 4. The breathable coated fabric according to any one of claims 1 to 3, having a peel strength of 0.7 to 1.5 Kgf/cm and a moisture permeability of 2000 g/m^2/24 Hr or more. 5 A base fabric in which a two-component polyurethane resin solution is partially applied to a fabric that has not been subjected to water-repellent treatment, dried, and aged to form a semi-crosslinked two-component polyurethane resin layer using the two-component polyurethane resin solution. A one-component polyurethane resin solution mixed with a powder that dissolves in the eluate but does not dissolve in the solvent of the urethane resin solution is applied on top, and is then dried and aged to form the two-component polyurethane resin layer. 1. A method for producing a breathable coated cloth, which comprises: crosslinking the one-component polyurethane resin layer and the cloth body to bond and integrate the two-component polyurethane resin layer, and then immersing the cloth in an eluent. 6. The method for producing a breathable coated fabric according to claim 5, wherein the degree of crosslinking of the semi-crosslinked two-component polyurethane resin layer of the base fabric is 30 to 70%. 7. The method for producing a breathable coated cloth according to claim 5 or 6, wherein the amount of the two-component polyurethane resin solution applied to the cloth is 10 to 30 g/m^2. 8. The method for producing a breathable coated fabric according to any one of claims 5 to 7, characterized in that the amount of the one-component polyurethane resin solution applied to the base fabric is 10 to 200 g/m^2. 9. The method for producing a breathable coated cloth according to claim 8, wherein the coating amount is 30 to 150 g/m^2. 10. The breathable coated fabric according to any one of claims 5 to 9, wherein drying to bring the two-component polyurethane resin layer into a semi-crosslinked state is carried out at 70 to 150°C for 30 seconds to 15 minutes. Production method. 11. Aeration according to any one of claims 5 to 10, characterized in that the aging to bring the two-component polyurethane resin layer into a semi-crosslinked state is carried out at a temperature of room temperature to 70° C. and left for up to 48 hours. Method of manufacturing sex-coated cloth. 12 A two-component polyurethane resin solution was partially applied to a cloth that had not been subjected to water-repellent treatment, dried, and aged to form a semi-crosslinked two-component polyurethane resin layer from the two-component polyurethane resin solution. A one-component polyurethane resin solution mixed with powder that dissolves in the eluate but does not dissolve in the solvent of the urethane resin solution is applied onto the base fabric, and then dried and aged to form the two-component polyurethane resin. The one-component polyurethane resin layer and the fabric are bonded and integrated with the two-component polyurethane resin layer by crosslinking the resin layer, and a powder is added that dissolves in the eluent but does not dissolve in the solvent of the urethane resin solution. 1. A method for producing a breathable coated fabric, which comprises applying a wet-coagulable one-component polyurethane resin solution mixed with a body, and then immersing the fabric in an eluent. 13 The coating amount of the one-component polyurethane resin solution to be bonded and integrated with the two-component polyurethane resin layer is 10 to 80%.
g/m^2, and the coating amount of the one-component polyurethane resin solution applied on this one-component polyurethane resin solution is:
13. The method for producing a breathable coated fabric according to claim 12, characterized in that it has a coating weight of 150 to 400 g/m^2.