KR910000430B1 - Sanitary napkin - Google Patents

Abstract

Carboxymethylalginate fibre, alginate fibre, or blended fibre of the above two fibres are used as a absorbing material in women's sanitary diaper. The finished product features lightweight due to its easy processability into panty hoses, less contribution to environmental contamination, excellent absorptive ability, fast coagulation of blood to prevent clothes from staining.

Description

Sanitary napkin absorbent material made of carboxymethyl alginate or alganate fiber

The present invention relates to a sanitary napkin absorbent comprising fibers of carboxymethyl alginate or alginate.

There are dozens of absorbent materials known to date, ranging from natural products such as cotton and pulp to sponges made from foaming synthetic polymers. Their absorption characteristics are absorbed through capillary tube, and the absorption power is only about 20 times, and water is easily removed when subjected to external pressure. Absorbent resins have been developed to overcome these drawbacks, which have the ability to absorb hundreds of times in the material, and once absorbed, the water swells up the material and does not release water under any pressure. This is a large functional resin. Such superabsorbent materials have been applied in various fields, such as sanitary products, agriculture, horticulture, construction, etc., and the development of these super absorbent materials is being actively conducted.

Absorbent resins were first developed in the 1960s by the US Department of Agriculture, and the process is the hydrolysis of copolymerized acrylonitrile in its entirety.

As a result, Henkel and Grain Processing of the United States began producing resins of this type in the late 1960s.

Meanwhile, in 1975, Samyang Chemical succeeded in developing a super absorbent material by graft-polymerizing acrylic acid on the whole.

Subsequently, several companies developed superabsorbent materials such as polyacrylic acid and P.V.A. In 1978, several companies, including Samyang Hwaseong, began trial production. At the end of the year, superabsorbent polymers were first applied to hygiene products. Since then, the development of applications continued, and in 1981, paper sanitary napkins made of absorbent resins first appeared.

Powder-like superabsorbent resins include polyacrylate crosslinked products, tenpon / polyacrylates, P.V.A crosslinked products, and P.V.A / polyacrylates.

Fibrous resins also include hydrolyzates of polyacrylonitrile and crosslinked C.M.C, which have low absorption capacity and high cost. Such superabsorbent polymers have to be equipped with functions such as absorbency, water retention, processability and stability.

Starch-acrylic acid and PAAS-based products have good absorption in pure water, but the absorption capacity is reduced by 10 times or less when used in saline conditions such as sanitary napkins. . In addition, the powder form is limited in processability, and there is a disadvantage in that it is not biodegradable after using a sanitary napkin to increase the environmental pollution.

Although P.V.A / polyacrylate copolymer and starch-acrylic acid are known to have excellent gel strength and thermal stability, they are also powder-processable and have no biodegradability.

C.M.C and the like crosslinked with the hydrolyzate of acrylonitrile are in the form of fibers, and thus have excellent workability, but have a small absorption capacity and a cost 2-3 times higher.

The present invention has the following advantages when used as an absorbent in a sanitary napkin with carboxymethyl alginate fibers and alginic acid fibers.

First, since carboxymethyl alginate or alginate can be made into fibers, the processability is excellent, so that the conventional sheet-type sanitary napkin can be made into a panty shape, thereby reducing the sanitary napkin.

Second, since natural polymer is a material, biodegradation is good after use, so there is no problem of environmental pollution.

Third, there is an advantage that the absorption capacity is superior to fibers such as acrylonitrile hydrolyzate or crosslinked C.M.C.

Finally, carboxymethyl alginate has a blood coagulation property that coagulates menstrual blood when used as a sanitary napkin absorbent. In order to prevent the leakage of blood to the outside due to the rapid increase in menstrual blood or weak sanitary napkin, the design can be improved by changing the design and increasing the water retention, but in the present invention, once absorbed by using a blood coagulating material The blood is coagulated rapidly by the blood coagulation factor (calcium ion) in the sanitary napkin to prevent the soiling of the coating by the blood.

Example 1

720 g of alginate was placed in a rotary stirring reactor, and 3,000 g of 40% ethanol and 1,500 g of toluene were added and vigorously stirred to disperse the alginic acid. In this way, the alginate was swollen in a state where a reaction occurred in the dispersion medium.

The stirring was stopped, and 510 g of 30% caustic soda was stirred vigorously with small amounts of 30 minutes added at 5 minute intervals. The water produced by this reaction was absorbed into ethanol to minimize the reverse reaction due to the reversible reaction.

The stirring was stopped and 470 g of chloroacetic acid was slowly added thereto to keep the temperature constant at 35 ° C. In order to adjust the pH, a certain amount of sodium carbonate is added until the pH reaches 8, and then stirring is started.

After stirring at 35 ° C. for 50 minutes, the temperature was cooled to 10 ° C. or lower and the stirring was stopped.

The dispersion was removed, and 1500 g of 95% ethanol was added to the resulting carboxymethyl alginate to completely remove the remaining dispersion, followed by filtration and drying at 120 ° C. to obtain carboxymethyl alginate.

Example 2

Carboxymethyl alginate was dissolved in distilled water to make a 2% solution, and then placed in a wet spinning device to prepare fibers.

The spinning pressure is 0.5-1.0kgf / cm ² and the spinning speed is 5-8m / min, which makes fiber formation well in the coagulation bath. The spinneret was L / D of the spinneret 110 and the nozzle process was 100 micrometers, and dried in the coagulation bath while the coagulating solution containing calcium chloride was continuously circulated through the coagulated stretching roller. The dried fibers produced a carboxymethyl alginate nonwoven fabric through a needle punch.

Example 3

50 g of sodium acetate, a calcium dissolving agent, was added to a mixture of 100 g of isopropanol and 400 g of water to prepare a washing solution. It was left to stand and the nonwoven fabric was inclined at 45 ° to remove the washing solution for 30 minutes, and 50% of the weight of the nonwoven fabric was poured into the upper nonwoven fabric by 50% of the weight of the nonwoven fabric to remove the unreacted washing solution.

This unreacted washing liquid removal process operation was repeated three times.

The non-woven fabric from which the unreacted washing solution was removed was poured with a small amount of 80% ethanol to prevent adhesion of the fibers.

The nonwoven fabric was tilted at 45 ° to remove the washing solution remaining between the nonwoven fabrics to obtain fibers, which were dried in a 60 ° C. dryer for 20 minutes.

In the present invention, the physical properties of the fiber mixed with carboxymethyl alginate and alganate are shown in Table 1, and the absorbency of the sample was measured by the tea bag method.

TABLE 1

The water uptake of alginate was 38-fold and the uptake of C.M.A was up to 110 depending on the mixing ratio.

This is a result of the increase in the ion concentration inside the absorbent as the carboxymethyl group increases.

The amount of absorption in the solution with external electrolyte, that is, menstrual blood, is markedly reduced as a result of the decrease in penetration pressure by the electrolyte under the spot condition. As a result, it is suitable to use 70-100% C.M.A in view of the correlation between manufacturing cost and absorbency.

Comparative Example 1

Next, Table 2 shows a comparison of the absorbency of the sanitary napkin using the carboxymethyl alginate and commercially available sanitary napkin.

TABLE 2

Existing sanitary napkins and fibers of the present invention by measuring the water absorption and menstrual blood absorption amount by the tea bag method can be seen that the absorption capacity of the carboxymethyl alginate fiber is excellent.

Comparative Example 2

Table 3 shows a comparison of the carboxymethyl alginate and the blood coagulation of the sanitary napkin currently in use. Blood coagulation was tested by whole blood coagulation test.

TABLE 3

Claims (2)

Sanitary napkin absorbent material made of carboxymethyl alginate or alginate fiber. Sanitary napkin absorbent material made of mixed fiber of carboxymethyl alginate and alginate.