JPH06169978A - Molding material rapidly curing with moisture - Google Patents

Abstract

PURPOSE:To provide a moisture-curing type molding material which can be promptly molded by anyone when required without the need for special technique, whereby a lightweight and air-permeable cured item which can be quickly cured is provided. CONSTITUTION:This moisture-curing type molding material is prepared by a method wherein granular materials having apparent specific gravity of 1 or less are coated with ethyl ether-based catalyst and a moisture-curing type polyurethane prepolymer and thereafter a moisture permeable material 2 is wrapped around the coated granular materials 1.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a moisture fast-curing molding material,
In particular, the present invention relates to a moisture-fast curable molding material containing polyurethane as a main ingredient and having excellent storage stability, which is used for fixing and correcting an affected area in the fields of sports and medicine.

[0002]

2. Description of the Related Art Conventionally, in the fields of sports and medical treatment, many molding materials have been used for fixing and correcting an affected area. For example, a cervical spine brace (Philadelphia Brace) used for cervical spine diseases such as whiplash is formed by molding polyethylene foam into the shape of the neck, applying a reinforcing plate from the front and back of the neck, and fastening it with Velcro. . In addition, people with disabilities such as cerebral palsy and muscular dystrophy cannot maintain their postures by themselves, so it is necessary to hold and fix them so that they wrap the body greatly. It is used as a good limb position holding device for persons. In addition, to treat spinal cord injuries such as caries, it is necessary to fix the patient to the bed in a calm and safe manner, and soak the sheet-shaped plaster cast bandage in water to the affected area (entire back). A Gibbs bed is used that is made by stacking multiple layers so that the lines of the body are faithfully displayed.

[0003]

There are two types of cervical spine braces, a made-to-order type and a ready-made type. Since the made-to-order type is made according to the patient, it is excellent in fixing the affected part, but to make a positive model, 1 for making
It has the drawback of taking ~ 2 weeks. On the other hand, the ready-made type does not perfectly match the shape of the neck, and therefore has a drawback that the fixing force is inferior. Further, both types use polyethylene foam that is not breathable, so that there is a drawback that the fixed portion becomes stuffy. What is generally used as a good position holding device for people with disabilities is a ready-made made by covering a plastic molded sheet with thick urethane foam laminated in the same way as a normal car seat or chair. This is a type, but it has a drawback that it is not possible to maintain the posture sufficiently because the price is low, but it cannot handle individual patients. Some custom-made products are made by shaving wood instead of plastic molded sheets to match the body shape of an individual, but they have the drawback of being expensive and time-consuming to manufacture. When the Gibbs bed is manufactured, the gypsum powder falls off during the work, so that the bed periphery is soiled and the operator is also soiled. Moreover, the patient cannot move until the Gibbs bandage is cured. The cast bed is uncomfortable for about a week until the plaster is completely dry. It has the drawback of not being breathable and damp even after drying. The Gibbs bed is not only heavy, but its surface and corners are easily broken, and its handling is very inconvenient, and the work of the nurse is also a heavy labor. Further, since the molded product is large and heavy when it is discarded, a special contractor is required for the treatment. Therefore, an object of the present invention is to provide a moisture-fast curable molding material that can be molded on the spot when anyone needs it without requiring special techniques, and that provides a cured product that is fast, lightweight, and breathable. It is the one we are trying to provide.

[0004]

A moisture fast-curing molding material according to the present invention is prepared by coating a granular material having an apparent specific gravity of 1 or less with a catalytic amount of an ethyl ether catalyst and a moisture-curable polyurethane prepolymer. The present invention relates to a fast-curing molding material obtained by packaging a predetermined amount with a moisture-permeable material, and in particular, the granular body is a foam, and the coating amount of the moisture-curable polyurethane prepolymer is 2 to It is preferable that the content is 30% by volume and that the moisture-permeable material is made of a nonwoven fabric.

The present invention will be described in detail below. The granular material used in the moisture fast-curing molding material of the present invention has an apparent specific gravity of 1 or less, preferably 0.5 or less, more preferably 0.2 or less. If it exceeds 1, the weight is sufficiently reduced as a molding material. Can't get In this granular material,
Examples of the organic material include polyethylene, polypropylene, ethylene-vinyl acetate copolymer resin, polystyrene, polyurethane, ABS resin, vinyl chloride resin, polyvinyl formal, acrylic resin, epoxy resin, phenol resin, urea resin, and silicone resin. Polymer compounds such as homopolymers or copolymers, cellulose acetate, cellulose, and rubber are mentioned. Among them, foams having a hollow inside, those having a structure in which a large number of these foams are gathered, many pores on the surface are included. Open foams and the like are preferred. Examples of the inorganic material include, for example, burned pearlite, shirasu balloon, porous glass, hollow glass, mineral slag, and porous or foamy granules such as pumice, which are coated on the surface in order to close holes on the surface. You can also use it. The above materials may be used alone or in combination of two or more, regardless of whether they are organic or inorganic. The size of these granules is usually 0.05 to 10 mm, preferably 0.1 to 7
mm, more preferably 0.2 to 5 mm. Further, these particle sizes may be uniform, or small particles and large particles may be mixed.

The polyurethane prepolymer coated on the particles is a one-component moisture-curable type having an isocyanate group at the terminal obtained by reacting a polyol with a polyisocyanate. As a polyol,
Add alkylene oxide (eg, ethylene oxide, propylene oxide, etc.) to low molecular weight polyols (eg, ethylene glycol, propylene glycol, glycerin, etc.), amines (eg, ethylene diamine, diethylene triamine, tolylene diamine, etc.) or polyphenols. Polyether polyol obtained by the method; polyester polyol obtained by dehydration condensation reaction of low molecular weight polyols and dicarboxylic acid (eg, adipic acid, phthalic acid); lactones (eg, γ-butyl lactone, ε-caprolactone, etc.) ) Polylactone polyol by ring-opening polymerization of tetrahydrofuran; Polytetramethylene glycol by ring-opening polymerization of tetrahydrofuran; Castor oil or its alkylene oxide adduct;
Examples thereof include polymers of diene compounds such as butadiene and isoprene, and a polydiene polyol having a hydroxyl group at the terminal or a hydrogenated product thereof. These are used alone or in combination of two or more.

On the other hand, examples of the polyisocyanate include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, p-phenylene diisocyanate and poly. Aromatic polyisocyanates such as methylene polyphenylene polyisocyanate; Aliphatic polyisocyanates such as hexamethylene diisocyanate; Alicyclic polyisocyanates such as 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate; Aryl such as xylylene diisocyanate Aliphatic polyisocyanates; and carbodiimideimide-modified or isocyanurate-modified polyisocyanates thereof, etc., and these are one kind alone. Others are used as a combination of two or more. Among them, preferred are aromatic polyisocyanates such as 4,4′-diphenylmethane diisocyanate, 2,4′-diphenylmethane diisocyanate, p-phenylene diisocyanate, polymethylene polyphenylene polyisocyanate, and carbodiimide-modified polyisocyanates thereof.

In order to obtain a urethane prepolymer having an isocyanate group at the terminal, the compounding ratio of the above polyol and polyisocyanate is usually 1.2 to 10 equivalents of polyisocyanate per equivalent of polyol, preferably 1.5 to 5
It is equivalent. Further, this reaction is usually achieved by heating and stirring at 30 to 120 ° C. The viscosity of the obtained urethane prepolymer is usually 10 to 2000 P, preferably 20 to 1000 P, measured at room temperature. The coating amount of the urethane prepolymer with respect to the granules is 2 to 30% by volume, preferably 10 to 30% by volume of the granules, and if the amount is less than 2% by volume, the granules can be sufficiently cured. No
Further, if it exceeds 30% by volume, a sufficient gap cannot be secured between each granular material, there is no escape path for carbon dioxide gas generated when the urethane prepolymer is cured by moisture, and the molding material swells and cannot be molded into a desired shape. Sometimes.

On the other hand, the ethyl ether-based catalyst is preferably an ethyl ether-based amine catalyst from the viewpoint of storage stability, and examples thereof include bis (dimethylaminoethyl) ether, bis (morpholinoethyl) ether, and bis (dimethylmorpholino). Ethyl) ether, etc., and 1
They may be used alone or in combination of two or more. The amount of the catalyst used varies depending on the type of the catalyst, but generally, it is preferably 0.01 to 5% by weight of the polyurethane prepolymer. In actual use, the curing of the molding material is adjusted to 5 to 30 minutes. It is desirable to do.

The coating of the ethyl ether-based catalyst and the moisture-curable polyurethane prepolymer on the particles is
Although it may be carried out separately, it is preferable to carry out after both are uniformly mixed by using a conventionally known one, for example, a kneader or the like, whereby the catalyst can be uniformly adhered to the granular material. When coating the above-mentioned granular material, in addition to the above-mentioned two components, a stabilizer, a defoaming agent, an antioxidant, a coloring agent (pigment, dye), a filler (calcium carbonate, titanium dioxide) may be added, if necessary. Etc.) may be added. Further, when preparing the mixture, it is desirable to use dried granules and mix them in an atmosphere such as nitrogen gas so that moisture in the air does not enter.

The thus coated granular material is then packaged in a predetermined amount with a moisture permeable material to obtain the moisture fast curing molding material of the present invention. Examples of the moisture-permeable material used here include woven cloth, knitted cloth, non-woven cloth, net, plastic film with holes or notches, sliced foam, and the like. Among these, a material in which the tissue gap is slightly smaller than the outer diameter of the granular body, has flexibility and stretchability, has a low water content, and the coated granular body is not likely to come into direct contact with the human body is preferable. As a specific example thereof, there is a non-woven fabric in which holes or cuts are provided to give elasticity. This moisture permeable material has a predetermined amount of the coated particles above 1
In addition to being lumped into individual pieces, the tackiness of the polyurethane prepolymer is isolated from the operator's hand, which facilitates handling. FIG. 1 is a sectional view showing an embodiment of the moisture-fast curable molding material of the present invention thus obtained, in which 1 is a coated granular material, 2
Is a bag made of a moisture permeable material.

The moisture fast-curing molding material of the present invention may be further sealed by a moisture impermeable material if necessary, and aluminum may be stored in a thermoplastic film such as polyethylene, polypropylene, polyamide or polyester. Examples thereof include packaging materials such as films laminated to the above, plastic containers such as polyethylene, polypropylene, polyester, and polycarbonate, and metal containers. When filling these containers, it is necessary to make sure that no water enters. FIG. 2 is a cross-sectional view showing a state in which the coated granular body 1 is housed in a flat bag 3 made of a moisture permeable material, and then folded and covered with a moisture impermeable material 4.

[0013]

[Function] The moisture fast-curing molding material of the present invention has an apparent specific gravity of 1
It is lightweight because it uses the following granules. Since the surface of the granular material is coated with the polyurethane prepolymer, the positions of the particles of the granular material are displaced and deformed by the pressure. Therefore, the desired shape can be easily obtained only by pressing the target object. The polyurethane prepolymer attached to each particle is cured by moisture or water in the air, and the particles are bonded to each other to give a molded product. that time,
The ethyl ether-based catalyst has the effect of accelerating the curing speed of the polyurethane prepolymer and making the curing time appropriate. The moisture permeable packaging material collects the polyurethane prepolymer coated granules into a single mass and isolates the polyurethane prepolymer stickiness from the operator's hand for easy handling.

[0014]

EXAMPLES Hereinafter, specific embodiments of the present invention will be described with reference to Examples, but the present invention is not limited thereto. (Production of Polyurethane Prepolymer Blend) Production Example 1 700 g of PPG-2000 (manufactured by Sanyo Kasei Co., Ltd., trade name, polypropylene ether glycol, hydroxyl value 56 mg-KOH / g) was placed in a 4-necked flask and depressurized under heating. After dehydration, ISONATE 125M (Mitsubishi Kasei Dow, trade name,
4,4'-diphenylmethane diisocyanate) 300 g
Was added and stirred. After reacting for another 3 hours, 18 g of dimorpholino diethyl ether and 2 g of benzoyl chloride were added at 50 ° C. and the mixture was further stirred and mixed for 1 hour to obtain a polyurethane prepolymer blend.

Example 1 10 liters of expanded styrene beads having a diameter of about 2 mm obtained by foaming Eslen beads HE (trade name, manufactured by Sekisui Kasei) and 1 liter of the polyurethane prepolymer compound obtained in Production Example 1 above Mix with and cut into a cylinder made of notched non-woven Soflon E RO-50 (manufactured by Unitech Co., Ltd.), width about 7 cm, thickness about 2 cm, length about
Moisture fast curing molding material A according to the invention in the form of a 40 cm plate was obtained. This molding material was placed in an aluminum-laminated plastic bag consisting of three layers of polyethylene / aluminum / polyethylene and heat-sealed to give a sample for storage. The moisture fast-curing molding material A was taken out from the aluminum-laminated plastic bag, dipped in water for about 10 seconds, shaken off lightly, and wrapped around a cylinder having a circumference of 20 cm to cure. It was cured in about 10 minutes, and a cylindrical molded product was obtained. In addition, the sample for storage put in the aluminum laminated plastic bag does not harden even after 6 months,
When it was immersed in water, it showed good curability.

Example 2 (Application to Gibbs bed) 180 liters of polyethylene spherical foam (made by Asahi Kasei, diameter about 2 mm) was put in a universal mixer and obtained in Production Example 1 with stirring under a nitrogen atmosphere. Then, 30 liters of the polyurethane prepolymer blend was added and mixed, and the polyurethane prepolymer was evenly adhered to the surface of the foam. Fabricated with notched non-woven Soflon E RO-50 (see above)
It was packed in a bag having a size of 100 cm × 210 cm, and the opening of the bag was adhered to obtain a moisture fast-curing molding material B according to the present invention. This was put in an aluminum laminated polybag consisting of three layers of polyethylene / aluminum / polyethylene and heat-sealed to obtain a sample for storage. The moisture fast-curing molding material B was taken out from the aluminum-laminated plastic bag and spread in the form of a futon.
After water was sprayed onto this surface, the surface was covered with a polyethylene film and further covered with a non-woven fabric, and then the patient taking a pattern was put to sleep. About 10 minutes later I got up and made a mold. Then, the polyethylene film and the non-woven fabric used for the covering were removed, and the covering was covered with cotton knitting to prepare a Gibbs bed. This Gibbs bed was much lighter than a bed made of gypsum plaster cast, and the feeling of moisture disappeared in 1 hour after making, and it was breathable and comfortable even if it stayed in the bed for a long time.

[0017]

EFFECTS OF THE INVENTION The moisture-fast curable molding material of the present invention does not need to be compounded as a single component before use and does not require any special technique, so that molding can be easily performed by anyone. It cures quickly and cures in place and is ready to use. The molded product is highly breathable and does not get stuffy or rash due to sweat. Furthermore, this molding material also has excellent storage stability.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a moisture fast-curing molding material according to the present invention.

FIG. 2 is a vertical cross-sectional view showing another embodiment of the moisture-fast curable molding material according to the present invention.

[Explanation of symbols]

1 ... Coated granules, 2, 3 ... Bag made of moisture permeable material, 4 ... Moisture impermeable material.

Claims (4)

[Claims] 1. A rapid moisture-curing method comprising coating a granular amount having an apparent specific gravity of 1 or less with a catalytic amount of an ethyl ether catalyst and a moisture-curable polyurethane prepolymer, and then wrapping a predetermined amount of the moisture-permeable material in a predetermined amount. Molding material. 2. The moisture fast-curing molding material according to claim 1, wherein the granular body is a foam. 3. The moisture-fast curable molding material according to claim 1, wherein the coating amount of the moisture-curable polyurethane prepolymer is 2 to 30% by volume of the granules. 4. The moisture fast-curing molding material according to claim 1, wherein the moisture-permeable material is a non-woven fabric.