JPS6020504B2 - Melt-proof processing method for synthetic fibers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for melt-proofing synthetic fibers, and more particularly to an improved method for imparting melt-proofing properties to synthetic fibers using a melamine derivative compound.

Conventionally, methods for imparting melt-proofing properties to synthetic fibers using melamine derivative compounds include applying a solution containing a melamine derivative compound and an acidic catalyst to synthetic fibers and then heat-treating them in the presence of moisture (specifically, Publication No. 1247 of 1973) or a method of applying a liquid containing a melamine derivative compound and tetrakis hydroxymethylphosphonium chloride or propane sultone to synthetic fibers and then steam-treating them (No. 13650 of Samurai Seki No. 13650) Publications) etc. are publicly known. However, with these methods, in order to impart sufficient enemy resistance to synthetic fibers, it is necessary to attach the melamine derivative compound to the fibers in an amount of about 1% by weight or more, and when such a large amount of resin is attached, In the case of dyed products, the hue becomes dull, the color development and sharpness are reduced, and the commercial value is significantly reduced, making it extremely difficult to put it into practical use. On the other hand, by coexisting a surfactant in the treatment solution or treating the surface of synthetic fibers with chemicals in advance, the melamine resin adhesion state was homogenized, and the required amount of resin was reduced to 5% by weight or less, 1 to 4% by weight. A method has been proposed (Japanese Patent Publication No. 49-32760) to reduce the amount by weight, but this method (although it can prevent the deterioration of hue clarity and color development to some extent) is still insufficient and impractical. The problem is that not only is there a lack of resin, but also there is not enough resin, so a satisfactory anti-melting effect cannot necessarily be obtained.

Furthermore, when synthetic fibers are pretreated with chemicals, the two-stage treatment is very complicated, and depending on the treatment conditions, the physical properties of the fibers may deteriorate. In addition, in all of the above methods, since heat treatment is performed in the presence of an acidic catalyst, formalin is liberated from the melamine derivative compound, contaminating the working environment, and adsorbing and remaining on the object to be treated, resulting in sanitary issues. It has the serious drawback of having undesirable effects. The present inventors completed the present invention as a result of intensive research in order to solve the above-mentioned problems in melt-proofing processing of synthetic fibers. That is, an object of the present invention is to provide a method for imparting excellent melt resistance to colored synthetic fibers without impairing their color development and vividness.

Another object of the present invention is to provide a method in which the production of free formalin is suppressed when imparting melt-proofing properties to synthetic fibers using a melamine transfer compound, thereby improving the working environment and the hygiene of the product. There is a particular thing. Further objects and effects of the present invention will become apparent from the following description.

The above object is characterized by applying an aqueous solution containing a melamine derivative compound with a pH of 8.5 to 10.0 to synthetic fibers, and then subjecting the synthetic fibers to a moist heat treatment in the presence of a moisture content of 25% or more based on the weight of the fibers. It has been made popular by the melt-proof processing method for synthetic fibers.

According to the method of the present invention, even if the amount of the melamine derivative compound attached to the fiber increases, for example, in excess of 5% by weight, the dyed material will not whiten and the hue will become dull, and the dyed material will not become white and the hue will develop. It is possible to obtain a product that has both color and clarity.

The synthetic fibers referred to in the present invention include polyamide fibers, polyester fibers, polyacrylonitrile fibers, polyolefin fibers, and the like, and these can be used in any form such as cotton, thread, rope fabric, and nonwoven fabric. In addition, these synthetic fibers can be mixed with each other or with non-heat meltable fibers such as natural fibers.
It may be blended, interwoven or interlaced.

Examples of the melamine transfer compound used in the present invention include, but are not limited to, hexamethylolmelamine, trimethylolmelamine, trismethoxymethylolmelamine, hexakismethoxymethylolmelamine, and the like. Among these melamine derivative compounds, hexamethylol melamine and trimethylol melamine have particularly excellent anti-melting effects, and also have advantages such as fast resin formation rate and easy production or acquisition, and are therefore used in the present invention. It is suitable for use. The concentration of these melamine derivative compounds in aqueous solutions generally ranges from 1 to 4% by weight, preferably from 5 to 25% by weight.

Further, in the present invention, the pH of the aqueous solution is 8.5 to 10.
．． It is particularly important that the pH is within the range of 8.
If the value is less than 5, the anti-melting effect can be obtained, but in the case of dyed items, whitening occurs and the color development and clarity of the hue decreases, and it is generally difficult to suppress the generation of free formalin. On the other hand, if it exceeds 10.0, it will take a long time to turn the melamine derivative compound into a resin, making it difficult to obtain good melt resistance, and in either case, the purpose of the present invention cannot be achieved. Any basic substance, whether inorganic or organic, such as , caustic soda, caustic potash, soda ash, ammonia, triethanolamine, dimethylaminoethanol, etc., can be used, but in general, caustic alkali or basic inorganic salts are used. It is preferable to do this because the operation is simple.

In addition, in the aqueous solution containing the above lamin derivative compound, 8-hydroxyethyl terephthalate, dimethyl phthalate, urea, thiourea,
In addition, a nonionic surfactant or the like may be added to improve the adhesion of the melamine derivative compound to the fiber surface. However, when using 8-hydroxyethyl terephthalate or the like, if the amount added is too large, the hue of the dyed object may become dull. The content is preferably 5% by weight or less. When a nonionic surfactant or the like is used, the concentration in the aqueous solution is approximately 0.001 to 0.1% by weight. As a means for applying the aqueous solution containing the above-mentioned lamin derivative compound to synthetic fibers, any of the means normally used for fiber processing, such as a pad method, dipping method, mist method, coating method, etc., can be used. From the viewpoint of uniform application, it is generally better to use the pad method.

The application amount is from 2 to 30%, preferably from 3 to 15%, based on the weight of the fibers, in solids content of the melamine derivative. The dosage is 2
If it is less than 30%, it is difficult to obtain a sufficient anti-melting effect, while if it is more than 30%, not only will the texture of the treated product become rough and stiff, but the hue may become dull. I don't like it. After the application of the aqueous solution is completed, the object to be treated is then subjected to a moist heat treatment.

Here, in the present invention, it is important to retain 25% or more moisture based on the weight of the material to be treated and its fibers, and if this is lowered, the desired anti-melting effect can be obtained. is not available. Therefore, in general, it is best to apply an aqueous solution to the object to be treated and, if necessary, apply a liquid solution, and then immediately perform the green heat treatment without going through a preliminary drying process.
Another advantage is that the process can be simplified. The moist heat treatment is performed at a temperature of 60 to 180 qo, preferably 95 to 140°C, and a relative humidity of 40% or more, preferably 95% or more.

The treatment time varies depending on the type of melamine derivative compound, the initial pH of the aqueous solution, the treatment temperature, etc., but is generally 10 to 1
It is about 8 minutes. Once the above treatment is completed, the final product is prepared by soaping, washing, drying, and final setting according to conventional methods.If necessary, antistatic agents or softeners may be applied during finishing setting. may be given. Thus, according to the present invention, even if the amount of the melamine transfer compound attached to the object to be treated is large, the hue does not become dull, and it has excellent melt resistance, clear hue, and color development. Furthermore, since the generation of free formalin during the treatment process is extremely low, the working environment is improved and the hygiene of the product is also improved.

Furthermore, since the treatment is carried out under mild alkaline conditions,
Another advantage of the present invention is that the physical properties of the object to be treated are not determined, and its industrial utility value is extremely large. The present invention will be explained in more detail below with reference to Examples.

In addition, in the experiment, the resin adhesion rate (%) was calculated from the weight increase of the treated cloth, and the hue change was calculated using the Hitachi self-recording spectrophotometer EPR-
Type 2 causes neck. Color difference △E between treated fabric and untreated fabric when colored
This is shown below. In addition, the melt resistance is measured by placing a test cloth of 5 pieces x 5 pieces on a copper rod with a diameter of 7' held at a predetermined temperature with no load (self weight).
for 5 seconds, and visually judged whether the contact area melted and formed a hole. Example 1 A polyester processed yarn twill fabric with a basis weight of 2502/m2 was dyed in a navy blue color using a disperse dye in a conventional manner.

An aqueous solution having the composition shown in Table 1 was uniformly applied to this dyed material by a pad method in an amount of 10% by weight (based on the fibers), and it was evaporated for 90 minutes in heated steam at a relative humidity of 98% and a temperature of 103:00 without drying. A heat treatment was carried out, and then unreacted substances were washed and removed by soaping at 80° C. for 20 minutes using two coats of a nonionic surfactant, and after drying, an antistatic agent was applied. The resin adhesion rate, color difference ΔE, and melt resistance of the obtained treated cloth were measured, and the results shown in Table 1 were obtained. In addition, during the above operation, after applying the aqueous solution, pre-drying at 110 oo to make the moisture retention rate of the dyed material about 20% (based on the weight of the fiber), followed by moist heat treatment, did not pass the anti-melt test. Melting occurred at less than 300 pm, and almost no treatment effect was obtained.

Furthermore, when an aqueous solution with a pH of 9.7 was used (the example of the present invention), the occurrence of formalin odor during operation was much less than when an aqueous solution with a low pH, especially an aqueous solution with a pH of 6.4, was used.

1st Representation ■ Beccamin JIOI (manufactured by Dainippon Inn Cloth Machinery Co., Ltd.) ■ Cuhydroquinethyl terephthalate As shown in Table 1, when the aqueous solution has a concentration of less than 8.5 (Comparative Examples 1, 2,
In 3), the color difference ΔE between the treated fabric and the untreated fabric is large, whereas inventive examples (4, 5) using an aqueous solution with a pH of 9.7
With this method, there is very little change in hue, and the melting resistance is as good as that of the method using an acidic treatment liquid.

Regarding color difference, it is generally said that if ΔE is 1 or less, there is almost no visible color difference.In fact, whitening was clearly observed in the treated cloth obtained in the comparative example, but in the present invention example, whitening was clearly observed. The color difference between the treated and untreated fabrics was almost invisible to the naked eye. On the other hand, when the pH is over 10 (Comparative Example 6)
Although the change in hue is small and the vividness of the hue and color development are excellent, the anti-melting effect is hardly obtained and the object of the present invention cannot be achieved.

The treated fabric of the present invention retained its initial performance even after being washed at home or dry cleaned one or more times, had a good feel, and had high commercial value.

Example 2 A polyester fabric with a fabric weight of 270/yel was dyed coffee brown by a conventional method using a disperse dye.

115% by weight of an aqueous solution having the composition shown in Table 2 was uniformly applied to this dyed object by the pad method, and the treatment was then carried out in the same manner as in Example 1.

Table 2 shows the physical properties of the treated fabric obtained.

From Table 2, when using an alkaline aqueous solution with a pH of 8.7, a product with less change in hue, excellent color effects, and good melt resistance can be obtained. I know that it will happen. The treated fabric of the present invention obtained here had a good feel and had high commercial value. Example 3 A nylon 6 fabric with a fabric weight of 155 mm/m was dyed a vivid blue using an acid dye in a conventional manner.

Add 7% by weight of an aqueous solution having the composition shown in Table 3 to this dyed object.
It was uniformly deposited by the pad method and treated in the same manner as in Example 1. Table 3 shows the physical properties of the treated fabric obtained.

3rd Surface Pressure Q Example IK It can be seen that the same acidity is further improved.

In addition, in the case of nylon, the dyed material has a particularly vivid hue. In comparative examples where ΔE is 1 or more, the commercial value decreases significantly.

Claims (1)

[Claims] 1 Synthetic fiber containing a melamine derivative compound at pH 8.
A method for melt-proofing synthetic fibers, which comprises applying an aqueous solution of 5 to 10.0% and then subjecting the fibers to a moist heat treatment in the presence of a moisture content of 25% or more based on the weight of the fibers. 2. The melt-proofing method according to claim 1, wherein the melamine derivative compound is trimethylolmelamine or hexamethylolmelamine. 3. The melt-proof processing method according to claim 1 or 2, wherein the melamine derivative compound is applied in a solid content of 3 to 15% based on the weight of the fiber. 4 Moist heat treatment at a temperature of 60°C to 180°C and a relative humidity of 40%.
The melt-proof processing method according to claim 1, which is carried out in the above heating atmosphere.