JPH0453982B2 - - Google Patents

Description

[Detailed description of the invention]

"Industrial Application Field" The present invention relates to a highly moisture permeable and highly waterproof material and a method for producing the same. The highly moisture permeable and highly waterproof material of the present invention is a base fabric, that is, a woven fabric, a knitted fabric, or a knitted fabric made of natural or synthetic fibers.
It is made by forming a microporous polyurethane resin layer on non-woven fabric, etc., and has moisture permeability, breathability, and waterproofness, and is widely used as a material for cloth products such as raincoats and various sportswear. . ``Prior art'' Conventionally, in order to produce a microporous film of urethane resin, a one-component polyurethane resin solution is spread, immersed in a water bath containing water or dimethylformamide, and solidified. It has been attempted to form a microporous polyurethane resin layer by replacing a solvent with a nonsolvent. In order to manufacture waterproof materials, it is necessary to laminate a polyurethane resin layer and a base fabric, and the usual adhesives used in this case have almost no moisture permeability when used alone to form a film. In order to laminate the urethane resin wet coating with the base fabric without impairing the performance of the urethane resin wet film, it was necessary to carry out special operations such as applying it in spots using a gravure coater or the like. In this case, there were problems with workability, and there was also a risk that problems would arise with peel strength. "Problems to be Solved by the Invention" The purpose of the present invention is to provide a two-component polyurethane resin adhesive that has high moisture permeability to the commonly used two-component polyurethane resin adhesive when laminating a highly moisture permeable and highly waterproof urethane resin wet film to a base fabric.・The aim is to obtain a material with high moisture permeability and high waterproofing without impairing the characteristics of the urethane resin wet film by imparting breathability. ``Means to solve the problem'' Apply a polyurethane resin solution onto a removable film using a roll coater or knife coater,
It is immersed in an aqueous solution containing dimethylformamide to solidify it, washed with hot water, and then dried in a hot air dryer to form a wet polyurethane resin film on the release film. Next, fibrous and/or powder pulp is added to the two-component reactive urethane resin solution as an adhesive together with a crosslinking agent and additives. The fibrous and/or powdered pulp to be added is
1 part by weight or more per 100 parts by weight of adhesive solution 50
Parts by weight or less are preferred. If it is less than 1 part by weight, there is no effect of improving moisture permeability, and if it exceeds 50 parts by weight, there is a drawback that the adhesive strength is extremely reduced. Further, the size of the fibrous and/or powdered pulp to be added is preferably 5 μm or more and 100 μm or less. If it is less than 5 μm, there is a high probability that it will be buried in the adhesive film and the addition effect will be poor, and if it exceeds 100 μm, there is a high possibility that the adhesive strength will be deteriorated. This adhesive is applied and spread on the urethane resin wet film using a roll coater or knife coater, a base fabric is bonded under pressure in a semi-dry state, and the reaction is completed by heating, after which the releasable film is peeled off. Thereafter, a water repellent treatment was performed using an aqueous solution of a water repellent to obtain a product. The laminating method is dry,
Either semi-dry or wet method may be used, and the urethane polymer used as the polyurethane resin solution may be any urethane polymer conventionally used for this type of coating.
Furthermore, two-component reactive urethane resins that are conventionally used may also be used. ``Function'' When a two-component polyurethane resin adhesive forms a film alone, it has almost no moisture permeability, but by adding pulp to the system, it becomes extremely hydrophilic and provides great moisture permeability through the pulp. The target performance can be adjusted by changing the shape, size, and amount of pulp. If you use a long one, you can also get breathability. By using this adhesive, a material with high moisture permeability and high waterproofness can be obtained by laminating the urethane resin wet film and the base fabric. Next, details of the present invention will be explained with reference to the following examples. In addition, depending on the specific compounding agents listed in the examples,
It is not intended to limit the scope of the claims of the present invention. "Example" A polyurethane resin solution of the content shown in Table 1 was applied to a polyester film with a matte treatment on one side to a thickness of 0.15 mm using a knife coater, and the film was immersed in an aqueous solution containing 20% dimethylformamide. The polyurethane resin was then solidified at 60°C.
After washing with hot water for 30 minutes, drying in a hot air dryer at 120℃ and printing on a polyester film to a thickness of 0.12mm.
A wet polyurethane resin coating was obtained. A two-component polyurethane resin adhesive solution having the composition shown in Table 2 (1) was applied onto the obtained polyurethane resin film using a knife coater at a concentration of 50 g per square meter in solution state, and heated at 50°C. After heating for 30 seconds with nylon
210 pieces of 70 denier taffeta were bonded together and dried at 80°C for 2 minutes, followed by heat treatment at 70°C for 48 hours. After heating, peel off the polyester film and the laminated product, and apply a 5% aqueous solution of fluorine-based water repellent.

A product was obtained by immersing it in [Dickguard F-60 (manufactured by Dainippon Ink)], reducing the pick-up amount to 70%, drying in a hot air dryer at 170°C, and baking the water repellent for 3 minutes. "Comparative Example" As a comparative example, a comparative product was obtained in the same manner as in the example except that the adhesive having the composition shown in Table 2 (2) was used. The product according to the present invention has extremely excellent moisture permeability and water resistance as shown in Table 3. Table-1 Crisbon 8366HV ¹⁾ 100 parts D MF 50 parts Nibusil SS-10 ²⁾ 5 parts Burgess KE ³⁾ 5 parts total 160 parts 1 Polyurethane resin liquid manufactured by Dainippon Ink 2 Hydrophobic silica manufactured by Nippon Silica 3 Manufactured by Burgess hard clay

【table】

[Table] "Effects of the Invention" In laminating the urethane resin wet coating with excellent moisture permeability, high air permeability, and waterproofness to the base fabric according to the present invention, a certain amount of fibrous or powdered pulp is used. By adding it to a two-component urethane resin adhesive solution, a material with high moisture permeability and high waterproofness can be obtained without impairing the properties of the urethane resin wet film.

Claims (1)

[Scope of Claims] 1. A urethane resin wet coating with excellent moisture permeability, high air permeability, and waterproofness and a base fabric have a laminated structure via an adhesive imparting high moisture permeability and high air permeability. Highly moisture permeable and highly waterproof material. 2. When laminating a urethane resin wet film with high moisture permeability, high air permeability, and excellent waterproof properties to the base fabric, a urethane resin wet film with high moisture permeability and high air permeability is added by adding fibrous or powdered pulp. High moisture permeability, characterized by the use of liquid urethane resin adhesive.
Method of manufacturing highly waterproof material. 3. The high transparency according to claim 2, characterized in that the amount of fibrous or powdered pulp added to the adhesive is 1 part by weight or more and 50 parts by weight or less based on the amount of the adhesive. Manufacturing method of moisture/highly waterproof material. 4 The size of the fibrous or powdered pulp is 5 μm
A method for producing a highly moisture permeable and highly waterproof material according to claim 2 or 3, characterized in that the particle diameter is greater than or equal to 100 μm or less.