JPH028068B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for coating dyed fabrics. More specifically, the present invention relates to a coating method that prevents migration staining of dyed synthetic fibers. Synthetic fibers have various excellent physical and chemical properties and are used for clothing and industrial materials. It is also an excellent material as a base fabric for coating processes. However, conventionally, the dyes used to dye synthetic fibers have a high compatibility with the coated resin, so over time, the dyes in the fibers gradually dissolve into the resin and become colored. Furthermore, if the dye dissolved into the resin was left to stand for a long time while being pressed against another coated fabric, a color transfer phenomenon could occur between the two. In addition, dyes from stored products contaminate the packaging film and further contaminate other products, which is what is called dye transfer contamination. The present inventors have arrived at the present invention as a result of intensive research in order to eliminate such drawbacks of synthetic fiber coated products. That is, the present invention provides dyed fabric with the following general formula []: [In the formula, R ₁ to R ₆ are each independently -H, -OH,
−OC _o H _2o+1 , −CH ₂ OC _o H _2o+1 , −CH ₂ OH, −
_{CH2CH2OH , -CH2CH2CH2OH} , _{-CONH2 , -}
CONHCH ₂ OH or

Represents [formula]. Here n represents an integer. ] The present invention relates to a coating method for preventing dye transfer contamination by applying a compound represented by the following and condensing the fabric by microwave heating, and then coating the fabric. Examples of synthetic fibers used in the present invention include polyamides such as nylon 4, nylon 6, nylon 66, nylon 610, nylon 12, or copolymers consisting of two or more monomer units constituting these, and sebacine. Polyesters produced by the condensation reaction of acid and ethylene glycol, adipic acid and ethylene glycol, or terphthalic acid and ethylene glycol or butylene glycol, composites of polyester and polyamide, and blended or interwoven fibers containing these. However, it is not limited to these in any way. Further, these synthetic fibers may be in any form such as cotton, thread, sliver, knitted fabric, or nonwoven fabric. In the present invention, the compound of the formula (melamine resin) is preferably used in an aqueous solution or dispersion at a concentration of 0.01% by weight or more, particularly from 0.05 to 10% by weight. The amount of resin deposited on the synthetic fiber is preferably 0.1% by weight or more based on the weight of the fiber, and a range of 1 to 10% by weight is particularly preferred since no discoloration occurs and the texture is good. The condensation reaction of the compound of formula [] in the present invention is preferably carried out in the presence of a catalyst, and such catalysts include fatty acid carboxylic acids such as formic acid and acetic acid,
Saturated dicarboxylic acids such as acrylic acid, malic acid,
Oxycarboxylic acids such as tartaric acid, aminocarboxylic acids such as glutamic acid, unsaturated dicarboxylic acids such as maleic acid, aromatic dicarboxylic acids such as phthalic acid, and their ammonium, sodium,
Examples include salts such as potassium. In addition to organic salts, salts of inorganic acids such as sulfuric acid, persulfuric acid, hydrochloric acid, phosphoric acid, and nitric acid, such as ammonium, sodium, magnesium, and aluminum, and their double salts can be mentioned. These catalysts are preferably used at bath concentrations ranging from 0.01 to 10% by weight. Any method such as dipping, spray coating, kiss roll or transfer method can be used to apply the mixed aqueous solution. Microwave heating is used for condensation treatment after adhesion of the mixed aqueous solution. That is, by using microwaves, a synthetic fiber product impregnated with the compound of formula [] is uniformly heated from the deep inside of the fabric. This microwave heating. For example, in the presence of moisture, 100W to 20kW,
Preferably at an output of 2 to 10 kW, 10 seconds to 60
This can be carried out by microwave irradiation for minutes, preferably 10 to 30 minutes. In addition, in the present invention, for the dispersion stability of the mixed aqueous solution,
Even if a surfactant is used, the effect is not affected in any way. These treatments add thickness to the surface layer of synthetic fibers.
Form a film of 0.01 micron or more, preferably 0.05 to 10 micron. The film has poor compatibility with dyes, and prevents the dye on the surface layer of the synthetic fiber from coming out onto the surface of the film, effectively preventing the dye from migrating and contaminating the coating layer that is subsequently processed. .
That is, by performing microwave heating according to the present invention, hydrogen abstraction reactions due to high energy state are likely to occur, crosslinking of the condensation product is promoted, and the densification of the resulting melamine film is increased. This seems to be the reason for the dramatic improvement in fastness. In the present invention, any well-known method can be used for applying the compound of formula [] and coating after the condensation treatment. That is, it is possible to use either wet or dry coating methods, any resin formulation such as urethane resin or acrylic resin, or any coating means such as a knife coater, pipe coater, reverse coater, kiss roll, etc. Furthermore, the migration stain prevention effect imparted by the present invention does not expire due to home washing, dry cleaning, etc., and the effect is semi-permanent. In addition, the texture of the fabric is hardly hardened, which is seen in conventional resin processing, and the fabric has good quality. The present invention will be further explained below with reference to Examples. Example 1 Polyester Pondy fabric (basis weight 220g/m ² )
After descaling and scouring in a conventional manner, it is dried and heat treated at 180℃ for 30 seconds. Next, the specified dye, auxiliary agent, acetic acid 0.3
%, dyed at 130°C for 60 minutes at a bath ratio of 1:40, and after reduction washing, neutralization, washing with water, and drying. Next, it was immersed in a treatment solution with the following formulation, and after the squeezing rate was reduced to 60%, it was treated in a microwave irradiation chamber filled with saturated steam at 100℃ for 10 minutes at an output of 5kW, and then soaped with hot water for 5 minutes. , at 180℃
Dry heat set for 30 seconds. Resin formulation Sumitex Resin M-3 (manufactured by Sumitomo Chemical) 5 parts Sumitex Accellerator EPX (manufactured by Sumitomo Chemical)
Add 0.5 parts water to make total volume 100 parts. Using the dyed fabric as a base fabric, polyurethane transparent laminate coating was applied, and a polyurethane layer was applied to a thickness of 20 μm. Waxbon 7367 (Dainippon Ink KK) as a laminating resin
It was used. The resulting sample was examined for migration contamination using the following procedure. Attach a polyester taffeta (bleached) urethane transparent laminate with the urethane side aligned with the urethane side of the sample, sandwich it between two glass plates for a sweat tester, and apply a load of 4.5 kg. Place in a dryer at 80±2℃ and leave for 48 hours. Take out the composite specimen and allow it to cool to room temperature. The contamination visible on the attached cloth after the test was graded using a contamination gray scale. Furthermore, the color difference between the untreated sample and the treated sample was evaluated. These results are shown in Table 1. As is clear from Table 1, the treated fabric according to the present invention exhibited a remarkable effect of preventing migration staining, and had good quality without hardening in the hand. In addition, color difference (ΔE) is the color difference between untreated cloth and treated cloth using Shimadzu spectrophotometer Color Seven (C light source, 1976,
It was determined by measurement using La*b* method).

[Table] Example 2 A polyester deshine fabric (fabric weight 130 g/m ² ) was desized and scoured in a conventional manner, dried, and heat treated at 180° C. for 30 seconds. Next, the specified dye, auxiliary agent, and acetic acid 0.3%
dyeing at 130°C for 60 minutes at a bath ratio of 1:40, followed by reduction washing, neutralization, washing with water, and drying. Next, it was immersed in a treatment solution with the following formulation, and the squeezing rate was reduced to 55%. After that, it was treated for 10 minutes at an output of 5kW in a microwave irradiation chamber filled with saturated steam at 100℃, and then soaped with hot water for 5 minutes. , 30 at 180℃
Dry heat set for seconds. For comparison, a sample was also prepared which was subjected to only steaming treatment under the above conditions without performing microwave irradiation. Resin formulation Sumitex Resin M-3 (manufactured by Sumitomo Chemical) 5 parts Sumitex Accellerator EPX (manufactured by Sumitomo Chemical)
Add 0.5 parts water to make total volume 100 parts. Using the treated fabric as a base fabric, the same coating process as in Example 1 was performed to obtain a sample. The degree of migration contamination of these samples and the color difference between the untreated product and the product of the present invention were investigated according to Example 1 and are shown in Table 2.
The results were obtained. As is clear from Table 2, due to the densification of the surface film by microwave irradiation, the treated fabric
It can be seen that compared to the untreated fabric and the normal steam-treated fabric, it exhibits a significant migration stain prevention effect. In addition, the treated fabric had good quality without any hardening.

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Claims (1)

[Claims] 1. The following general formula [] is applied to the dyed fabric: [In the above formula, R ₁ to R ₆ are each independently -H, -
OH, −OC _o H _2o+1 , −CH ₂ OC _o H _2o+1 , −CH ₂ OH, −
_{CH2CH2OH , -CH2CH2CH2OH} , _{-CONH2 , -}
CONHCH ₂ OH or [Formula]. Here n represents an integer. ] A method for coating a dyed fabric, which comprises applying a compound represented by the formula below and subjecting the fabric to a condensation treatment by microwave heating, and then coating the fabric.