JPS6249392B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method of applying a highly durable water- and oil-repellent finish to polyamide synthetic fibers. Polyamide synthetic fibers have excellent strength, abrasion resistance, and dyeability, but they are poor in water and oil repellency, and do not like the adhesion of water or oil to things such as umbrellas, raincoats, snowwear, work clothes, and carpets. For its intended use, it needed to be treated to be water and oil repellent. However, since the conventionally used finishing agents adhere to the surface of the fabric, there is a drawback that the finishing agents fall off during repeated rubbing, kneading, washing, etc. The present inventor has studied a processing method that imparts water and oil repellency to the surface of fibers, while chemically bonding them strongly to withstand washing, friction, etc., and has arrived at the present invention. That is, the present invention provides a processing method in which polyamide synthetic fibers are treated with a polyvalent phenol compound and then treated with a perfluoro group-containing compound that is reactive with phenol groups to impart durable water and oil repellency to the fiber surface. It is. The polyamide used in the present invention is, for example, poly-ε
-capramide, poly-ω-nonamide, poly-ω-
Polyamides from ω-amino acids or ω-lactams such as lauramide, diamines and dicarboxylic acids such as polyhexamethylene adipamide, polyhexamethylene sebacamide, polyhexamethylene isophthalamide, polyxylylene adipamide. polyamides, copolymers of these components,
It refers to polymer blends of these various polymers. These polyamides may contain a matting agent, a heat stabilizer, an ultraviolet absorbing agent, an antistatic agent, a fluorescent whitening agent, a terminal blocking agent, etc., as required. In the present invention, polyamide synthetic fibers are first treated with a polyphenol compound. The polyhydric phenol compound used in the present invention is a compound having two or more phenol groups, and compounds called so-called fixing agents are suitable. For example, the following compounds are exemplified.

【formula】

【formula】

[Formula] [n is an integer of 2 to 4] These compounds are applied to the fibers at a concentration of 0.1 to 10% (owf), for example, as an aqueous solution with a pH of 2 to 6. After the polyamide synthetic fiber is treated with polyhydric phenol, it is treated with a perfluoro group-containing compound that is reactive with phenol groups. Examples of compounds having reactivity with phenol groups include the following.

【formula】

【formula】

【formula】

【formula】

[Water repellency]

Droplets with the composition shown in the table below (5 mm in diameter)
Place three droplets on the sample and observe whether two or more of them maintain the state of droplets without wetting the sample for 10 seconds, and the highest rank indicates water repellency.

[Oil repellency]

Droplets with the composition shown in the table below (5 mm in diameter)
Three samples were placed on the sample, and two of them were observed to see if they remained in the form of droplets without wetting the sample for 3 minutes, and the highest rank indicates oil repellency.

[Traffic test]

Water repellency of carpet or fabric after 20,000 people pass over it;
Evaluation of oil repellency. Example 1 2 kg of crimped dyed yarn of polyε-caprolactam fiber bright 1000 denier 68 filament was put into a cheese dyeing machine, and a polyvalent phenolsulfonic acid derivative (trade name: Niro Fixx TH, manufactured by Nippon Someka Kogyo Co., Ltd.) was put into a cheese dyeing machine.
A solution of 200 g of Co., Ltd. and 25 liters of water was injected and circulated at 80°C for 10 minutes. Subsequently, water was injected to wash it, and then it was once dried. Next, a reaction mixture of 25 liters of N,N'-dimethylformamide, 500 g of triethylamine, and 500 g of hexafluoropropene trimer was poured into the dyeing machine, and the dried cheese was circulated at room temperature for 1 hour.
After the reaction was completed, the liquid was drained, the fibers were washed with an acetic acid aqueous solution, and then washed with water, and then the cheese was dried. A loop pile carpet was made from the yarn treated in this way and evaluated for water and oil repellency, and as shown in Table 1, it showed excellent durability. Comparative Example 1 Using the same fibers as in Example 1, a loop pile carpet was made in a conventional manner without water- and oil-repellent treatment. Commercially available fluorine-based antifouling agents (Asahi Guard 730, Meisei Chemical Industry Co., Ltd.)
Co., Ltd.) was sprayed at 0.8 owf and heat treated at 130°C for 5 minutes. The water and oil repellency of this product showed performance comparable to that of the product of Example 1 before the traffic test, but the performance deteriorated significantly after the traffic test. The evaluation results are shown in Table 1. Comparative Example 2 The same carpet as in Comparative Example 1 was made from the same fibers and evaluated without any antifouling treatment. No water or oil repellency was observed in the product before the road test. The evaluation results are shown in Table 1.

【table】

Claims (1)

[Claims] 1. A method for water- and oil-repellent processing of polyamide synthetic fibers, which comprises treating polyamide synthetic fibers with a polyvalent phenol compound and then treating them with a perfluoro group-containing compound that is reactive with phenol groups.