JPS60158861A - Water absorbent - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water-absorbing agent that has water-absorbing properties and also has deodorizing ability.

Conventionally, as water absorbing agents, hydrolysates of starch-acrylonitrile-covered raft copolymers, neutralized products of starch-acrylic acid graft polymers, cross-linked carboxymethyl cellulose,
acrylic acid ester-vinyl acetate copolymer compound;
Partially neutralized polyacrylate crosslinked products, crosslinked polyvinyl alcohol modified products, crosslinked imbutylene-maleic anhydride copolymers, etc. are known.

In recent years, these water absorbing agents have been used in sanitary materials such as sanitary napkins and disposable diapers. However, when these water-absorbing agents are used in sanitary materials, although they absorb urine and blood, the unpleasant odors caused by these agents cannot eliminate the discomfort during use.

In order to remove this bad odor, activated carbon and other deodorizing agents are used in some cases, but the deodorizing ability is still insufficient, and the manufacturing process of disposable diapers and sanitary napkins is complicated and complicated. There are drawbacks such as high cost and υ.

As such, there is currently no known material that has both excellent water absorption and powerful deodorizing ability, and is used for sanitary materials or other industrial applications that require both moisture absorption and deodorization functions. It is hoped that an excellent water-absorbing agent with strong deodorizing ability will emerge.

In view of this situation, the present inventors have conducted extensive research and have arrived at the present invention. That is, the present invention uses water absorbent resin (a
) and a leaf extract (b) of a plant of the Camellia family.

The water-absorbing resin (a) used in the present invention is water-based, and includes, for example, a hydrolyzate of starch-acrylonitrile graft copolymer (for example, disclosed in Japanese Patent Publication No. 49-43395), starch-acrylic acid Neutralized products of graft polymers (e.g., Japanese Patent Publication No. 46199/1983, Japanese Patent Publication No. 55/1983)
21041), saponified products of acrylic acid ester-vinyl acetate copolymer (disclosed in Japanese Patent Publication No. 53-134),
(Disclosed in Publication No. 95, Japanese Patent Publication No. 55-19243),
Cross-linked polyvinyl alcohol modified products (e.g. JP-A-54-
20093), partially neutralized polyacrylate crosslinked products (for example, JP-A-55-84304, JP-A-56-93716, JP-A-56-161408, JP-A-58- 71907), crosslinked inbutylene-maleic anhydride copolymer (disclosed in JP-A-5
6-36504), etc. can be used. Among these, partially neutralized crosslinked polyacrylates are preferred in terms of water absorption and deodorizing ability.

The leaf extract (b) of the Camellia family plant used in the present invention is
For example, it is extracted from the leaves of camellia, tea plants, sasanqua, sakaki, hisakaki, etc. with organic solvents such as alcohols and ketones, water, or mixed solvents thereof. The leaf extract (b) of a plant belonging to the Camellia family has a stronger deodorizing effect than extracts from other plants. The above extract (b) contains components such as flavonols, flavanols, organic polymers, and tannic acid, but its deodorizing mechanism is not clear.

Commercially available products include Shiraimatsu Shinyaku's ``NI-
Fresca" can be used.

The amount of the leaf extract (b) of the Camellia plant to be used is preferably 0.01 ppm or more based on the weight of the water-absorbing resin (,), and can be arbitrarily selected depending on the purpose of use. If the content of the leaf extract (b) of a plant belonging to the Camellia family is less than 0.01 ppm, the resulting water absorbing agent will have a weak deodorizing effect, which is not preferable. As described above, the performance is normally exhibited at 0.01 ppm or more, but when the water absorbing agent of the present invention is used for diapers, sanitary cotton, etc., the amount of the leaf extract (b) of the Camellia family plant to be added should be adjusted to increase the water absorbency. resin(,
) to o,ooot weight percent (1ppm)
-10 weight percent is preferable, and if o, ooo is less than 1 weight percent, a bad odor may be observed if there is a large amount of absorbed liquid such as urine during use. If the amount exceeds 10% by weight, there is no difference in the deodorizing effect and it is economically disadvantageous.

The water-absorbing agent of the present invention can be obtained from the water-absorbing resin (2) and the leaf extract (b) of a plant belonging to the Camellia family, for example, by the following method.

(1) Water-absorbing resin (a) and camelliaceae plant leaf extract (b)
) or a method of spray-mixing a solution such as an aqueous solution or an alcohol solution of the extract (b).

(2) A method in which the water-absorbent resin (a) and the leaf extract (b) of a plant of the Camellia family are added to a solvent that does not swell the water-absorbent resin (,), and after stirring and mixing, the solvent is removed.

(3) A method of mixing a water-absorbing resin (a) and a powdered or granular leaf extract of a plant of the Camellia family (b).

Although the water absorbing agent can be removed by these methods, the present invention is of course not limited to these methods.

When the water absorbing agent of the present invention is used for disposable diapers, sanitary cotton, etc.,
Whether used in water absorption sheets or in other cases,
From the viewpoint of ease of handling, water absorption, and deodorizing effects, it is preferably in powder or granule form.

The water absorbing agent of the present invention has far superior performance compared to conventionally known water absorbing agents. That is, the water-absorbing agent of the present invention absorbs and swells body fluids such as urine, menstrual blood, and sweat, as well as liquids generated from garbage, etc., and deodorizes bad odors generated from these excreta and liquids. , this deodorizing effect lasts for a long time. It is known that conventional water absorbent resins alone absorb some ammonia.

It is also known that leaf extracts of plants of the Camellia family have a deodorizing effect. However, the water-absorbing agent of the present invention comprising a water-absorbing resin (,) and a leaf extract (b) of a plant of the Camellia family,
Even compared to conventionally used water-absorbing resins, it has a much greater deodorizing effect than the leaf extract of Camelliaaceae plants alone, and also maintains excellent water-absorbing ability.

The water absorbing agent of the present invention can be used for disposable diapers for adults or children,
It can be effectively used to absorb water and deodorize sanitary products, shoe insoles, etc. It can also be used in gamma-con air purifiers, deodorizing foul-smelling gases, deodorizing garbage and human waste disposal, and even as a desiccant.

Examples will be shown below, but the present invention is not limited to these Examples.

In addition, unless otherwise specified in the examples shown below,
All parts and parts are by weight.

Reference Example 1 100 parts of water-absorbing resin powder (1) mainly composed of partially neutralized cross-linked polyacrylate (trade name: Aqualink CA manufactured by Nippon Shokubai Chemical Industry Co., Ltd.) and a 15% aqueous solution of leaf extract of Camelliaceae plant (Product name: NI-Fresca 800M01 Shiraimatsu Shinyaku■
Water absorbing agent (1) is obtained by spraying and mixing 5 parts of granules.

Reference Example 2 NI-Flaska 800M0 was added to 100 parts of water-absorbing resin powder (2) (trade name: Aqua Keep 108H, manufactured by Seitetsu Kagaku Kogyo ■) mainly composed of partially neutralized cross-linked polyacrylate.
The granules obtained by spray-mixing 5 parts of a 50% aqueous solution of
2).

Reference example 3 Starch-acrylic graft water absorbent resin powder (3) (
To 100 parts of Sanwet-E M-1000 (trade name, manufactured by Sanyo Chemical Industries ■), 5 parts of a powder containing a leaf extract of a plant of the Camellia family (trade name Nl-7 Resca 400H, manufactured by Shiraimatsu Shinyaku ■) was added and mixed by stirring. The powder obtained is used as a water absorbing agent (3).

Reference/Example 4 Water-absorbing resin powder (4) whose main component is a partially neutralized polyacrylate crosslinked product (trade name Arasop, Arayo Kagaku Kogyo ■j
J1) Take 50 t) in a flask, hexane 100
m/ was added to form a slurry. To this was added 12 pieces of NI-Fresca 800M0, and the mixture was stirred and mixed at 20 to 40°C for 30 minutes. Next, after removing hexane by a conventional method, 80
The powder obtained by drying under reduced pressure at ~100°C is used as a water absorbing agent (4).

Reference Example 5 Water-absorbing resin ice powder (5) whose main component is saponified acrylic acid ester-vinyl acetate copolymer (trade name Sumikagel 5)
-50. Sumitomo Chemical ■lff1) to.

A water-absorbing agent (5) is prepared by spraying and mixing 5 parts of NI-Fresca sooMoosos ethanol solution per 1 part of the water-absorbing agent.

Example 1 Water-absorbing agents (1) to (5) and the water-absorbing resin used in Reference Examples (1) to (5) alone were used, and 3 f of each were mixed into commercially available children's disposable diapers (non-woven fabric, cotton-like pulp). , 72 f weight consisting of water-absorbing paper and waterproof film).

In addition, as a single leaf extract of Camellia plant, 0.15
t of NI-Flexa 800M0 was sprinkled into similar disposable diapers.

After adding 100 cc of a uniformly mixed bed of 15 adult males to the 11 types of disposable diapers thus obtained, an odor evaluation test was conducted by a panel of 50 males aged 23 to 49 years.

Also, after leaving this diaper at room temperature for 10 minutes, 23cIrLX
Ten sheets of 23 cm paper towels were folded in half and placed over the diaper, and then a 10 kg weight was placed over the diaper and the weight of the towel was measured.

The results are shown in Table 1, and water absorbing agents (1) to (5) showed good deodorizing effects.

Table 1 Example 2 An odor evaluation test similar to that conducted in Example 1 was conducted 12 hours after urine was added. The results are shown in Table 2, and the water absorbing agents (11 to 5) maintained their excellent deodorizing effect even after 12 hours.

Table 2 Example 3 Water absorbing agent (1) was mixed into a nonwoven fabric in an amount of 10% by weight in advance and formed into a sheet. When the sheet obtained in this way was used as a filter for a car air conditioner, it was able to prevent mold odors during heating and cooling operation.

Example 4 Water absorbing agent (2) After putting s o t into a 200 ml polypropylene cup, 28 thiammonia water xo
ml was injected and the lid was placed. When I opened the lid and checked the odor after leaving it at room temperature for 1 minute, there was no odor at all.

Reference Example 6 Water Absorbing Agent (1) 10 f was folded in two with a nonwoven fabric measuring 5 cIn long and 10 cIn wide, sandwiched between them, stapled around the edges, and left at room temperature for 3 days. This is a water absorption sheet (1)
shall be.

Reference Example 7 A nonwoven fabric measuring 5 cm long and 10 crn wide was folded in two, sprayed with 12 ml of Fresca 800M0 aqueous solution, and left at room temperature for 3 days. This is called a water absorbent sheet (2).

Example 5 Water-absorbing sheets (1) and (2) obtained in Reference Examples 6 and 7
Each was placed in a 500 cc polypropylene cup, a gas containing 0.1 ml of trimethylamine was injected into the cup, the lid was closed, and the odor was evaluated after 10 minutes.

The one containing the water-absorbing sheet (1) was odorless, but the one containing the water-absorbing sheet (2) was odorless. That is, it was found that the water absorbing agent according to the present invention can maintain the deodorizing effect for a long time.

Claims (1)

[Claims] 1. Water-absorbing resin (,) and Camellia plant leaf extract (b)
) and a water-absorbing agent.