JPS587550B2 - How to prevent cotton yarn from drying out - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for preventing cotton yarn from drying out.

More specifically, it relates to a method of using a highly water-absorbing water-swellable resin, allowing it to absorb a large amount of water, and controlling the humidity with the water vapor that evaporates from it to prevent the cotton yarn from drying out.

In general, the moisture content of fibers varies depending on the dry state in the air, so
The official moisture content is determined by JIS as a commercial standard, and for cotton yarn, this value is s. It is 5%.

However, cotton yarn does not dry in an atmosphere with relative humidity of 65 degrees or more, but tends to lose weight on drying if the relative humidity is lower than that.

Therefore, in our country, it is hot and humid in the summer, so there is no problem with the cotton yarn drying out, but in the winter, when the humidity is low, the cotton yarn dries out by 1 to 3% of the official moisture content, resulting in weight loss. .

This not only causes commercial inconvenience, but also
The physical and mechanical properties of the fibers are also adversely affected.

Therefore, cotton threads are generally stored in a humidifying device or mechanically operated using pressurized steam to contain moisture in order to prevent the moisture content from decreasing.

However, if the cotton yarn once soaked with moisture is stored in a cardboard box or the like and left in a dry atmosphere, it will dry out again in one to two weeks and lose weight.

As a result of various studies, the present inventors discovered that it is possible to effectively prevent cotton yarn from drying by using a so-called super absorbent resin.
Completed Honhaimei.

The present invention is characterized in that a hydrated superabsorbent resin is sealed together with cotton thread in the container.

Here, super absorbent resin not only absorbs a large amount of water, but also has an extremely strong water retention capacity compared to conventional water absorbent materials such as absorbent cotton, sponge, and tissue paper. Once absorbed, water hardly flows out even when strong pressure is applied, so even if containers, cotton threads, etc. come into contact, they are unlikely to be contaminated with water, and depending on the dryness of the atmosphere. Since moisture is released as appropriate, appropriate humidity control is possible over a long period of time.

Examples of such superabsorbent resins include a starch-acrylonitrile graft polymer hydrolyzate (capable of absorbing several hundred times the amount of water and swelling) developed by the U.S. Department of Agriculture's Northern Research Institute. Crosslinking reaction product of carboxymethyl cellulose with a compound having an acrylamide group, an allyloxyazomethine group, or a chloroazomethyl group; carboxymethylated starch and bishydroxyethyl sulfone,
or a crosslinked product with shrimp chlorohydrin; crosslinked starch, cyanoethylated starch, and carboxymethylated starch grafted with acrylonitrile and saponified; starch co-grafted with acrylamide and a sulfonic acid-containing monomer; cellulose pulp graft polymerized with acrylonitrile and saponified; carboxymethyl cellulose cross-linked with shrimp chlorohydrin or ethylene glycol diglycidyl ether; acrylonitrile-methyl acrylate copolymer saponified with NaOH and then cross-linked with formaldehyde; Alkali saponified product of acrylamide-methylenebisacrylamide copolymer; polycarboxylic acid type polymer, for example, polyN-
Vinyl alcohol-acrylate copolymer crosslinked with methylol acrylamide and urea formaldehyde;
Many products are known, such as a crosslinking reaction product of polyoxyethylene by radiation irradiation; a crosslinking reaction product of polyoxyethylene with polyisocyanate; a crosslinking reaction product of polyvinyl alcohol and polyvinylpyrrolidone.

In the present invention, any material having the characteristics of a superabsorbent resin can be used, and its chemical structure is not particularly limited.

In the present invention, even if the resin is used in the form of a film, sheets such as woven fabrics, knitted fabrics, non-woven fabrics, paper, and plastic snack films made of various fibers are used as carriers, and the resin is coated on them ( or fixation).

In the latter case, the resin may be applied in liquid form by surface application methods such as coating, spraying, and dipping, and may be used in combination with other adhesives.

If the resin is used in powder form, the powder may be coated alone or together with other adhesives onto the sheets, or the adhesive may be applied to the sheets in advance and then the powder may be evenly spread. , can be established.

Note that when nonwoven fabric, paper, or the like is used as a carrier, the resin can be mixed into the carrier and fixed on the product during their production.

Such film and sheet coatings can be immersed in water to increase their weight by 10 times or more, several 10 times to several 1 times their own weight.
Since it absorbs 1,000 times more water, if an appropriate amount of it is placed in a container such as cardboard along with cotton yarn, it will have an excellent effect of preventing the cotton yarn from drying out.

Its effects are long-lasting and can be used repeatedly.

The method of the present invention is so simple and stable that it is easy to use for both storage and transportation of cotton threads, and there is little risk of staining containers, cotton threads, etc. due to the strong water-holding power of the resin.

In particular, as shown in the examples below, when a super absorbent resin is supported by a porous sheet, the effect is remarkable.

In addition, in the present invention, the superabsorbent resin may be used in a wide-mouth container, and additives such as deterioration inhibitors, ultraviolet inhibitors, preservatives, inorganic salts, and surfactants may be added to the superabsorbent resin. May be used together.

Next, examples of the present invention will be shown, but the present invention is not limited thereto.

In addition, unless otherwise specified, in the examples "part" and "u%"
``v'' indicates parts by weight and % by weight.

Example [1] A polyoxyethylene-isocyanate thread superabsorbent resin liquid (Aquaprene L-710 manufactured by Meisei Chemical Industry Co., Ltd.: solid content 15%) was cast onto a glass plate, and the solvent was heated to about 70 to 80°C. was removed to obtain a film with a thickness of about 2 mm.

The film having a dry weight of 32 g was immersed in water to absorb water.

The surface of the swollen water-containing film was 148.5 cm2, and the amount of water absorbed was 750I.

This water-containing film was coated with 32cm x 52cm Enphos paper (
A water-containing sheet with a basis weight of 309/yj) was sandwiched in a sandwich shape and the edges were adhered with a polyvinyl acetate emulsion to make a sealed bag-like water-containing sheet.

After laying the above water-containing sheet on the bottom of a cardboard case (43 cm x 68 CL x 36 cm), 16 pieces of cheese made of cotton thread adjusted to a moisture content of 9.2% were packed in two tiers, and the above water-containing sheet was placed on top of the cotton thread. After that, the cardboard case was sealed with packing tape.

Example [2] Powder of a commercially available starch-acrylic acid graft polymer fiber superabsorbent resin was pulverized using a Toshiba mixer and passed through a 100-mesh sieve.

15 g of the above fine powder resin was mixed with 40 g of a polyoxyethylene-isocyanate thread superabsorbent resin liquid (Aquaprene L-530 manufactured by Meisei Chemical Industry Co., Ltd.; solid content 15%) and uniformly dispersed.

The obtained dispersion was coated on the same embossed paper (3
0cm x 50cm) using a bar coater and heated at 80℃.
It was dried for 30 minutes.

The obtained sheet was made to absorb 750 g of water, and this was sandwiched between embossed paper (32 c L x 52 cr), and Example [1]
A water-containing sheet was obtained in the same manner as above.

Thereafter, using the water-containing sheet, cotton yarn was packed in a box in the same manner as in Example [1].

Example [3] 100% of commercially available acrylic yarn polymer superabsorbent resin powder
Passed through a mesh sieve.

Next, shrimp chlorohydrin rubber (Ebichromer H manufactured by Nippon Zeon Co., Ltd.) was mixed with toluene and ethylene dichloride in a ratio of 1:1.
20 g of the above powdered resin was added to 30 g of the shrimp chlorohydrin rubber solution obtained by dissolving it in the mixed liquid to a concentration of 10%, and the resin was dispersed.

Using this dispersion, a water-containing sheet containing 750 g of water was obtained in exactly the same manner as in Example [2].

Thereafter, using the water-containing sheet, cotton yarn was packed in a box in the same manner as in Example [1].

Example [1] Using cotton yarn cases obtained in Examples [1] to [3] and cotton yarn without using a water-containing sheet as a comparative example
The cotton yarn case packed in a box according to the method described above was left on a desk in a laboratory at room temperature and a relative temperature of 35 to 55 degrees Celsius for 200 hours.

Table 1 shows the changes in the moisture content of the cotton yarn in each case.

It can be seen that in all of the cases obtained in the examples according to the present invention, the moisture content of the cotton yarn decreases little and maintains a value close to the official moisture content.

In addition, in each case, the cardboard will not be damaged by moisture.
I was able to hold it stably.

Claims (1)

[Scope of Claims] 1. A method for preventing softening of cotton yarn, which comprises enclosing a water-containing super absorbent resin together with the cotton yarn in a container. 2. The method according to claim 1, wherein the resin is formed into a film. 3. The method according to claim 1, wherein the resin is applied to a sheet. 4. The method according to any one of claims 1 to 3, wherein the resin is supported on a porous sheet. 5. The method according to any one of claims 1 to 4, wherein the resin is placed in a wide-mouth container. 6. The method according to any one of claims 1 to 5, wherein the resin absorbs 10 times or more of its own weight of water.