KR20010001279A - Orthopedic Casting Tape and Method of Preparing the Same - Google Patents

Abstract

PURPOSE: A casting tape for the orthopedic surgery and its preparation method are provided, to improve the compression strength and the smoothness and to reduce the harmfulness. CONSTITUTION: The method comprises the steps of preparing polyurethane resin solution by using 50-70 wt% of diphenylmethane diisocyanate(MDI), 25-35 wt% of polypropylene glycol(PPG) and 5-15 wt% of polyalkylene glycol(PG) as a polyurethane prepolymer, 0.1-1.0 wt% of 2,2'-dimorpholinyldialkyl ether(DMEDD) as a catalyst, 0.1-0.5 wt% of pyrogalic acid 0.1-0.5 wt% of dimethylopropionic acid as a stabilizer, 1-5 wt% of sodium lauryl sulfate as a lubricant, and 0.1-1.0 wt% of a silicon-type anti-foaming agent; and coating the polyurethane resin solution to the 4 bar Raschel knit prepared by using polyester filament.

Description

Orthopedic Casting Tape and Method of Preparing the Same

Field of invention

The present invention relates to an orthopedic casting tape. More specifically, the present invention relates to orthopedic casting tapes prepared by weaving a fabric using a polyester yarn and applying the woven fabric to a polyurethane resin solution.

Background of the Invention

Conventional orthopedic casting tape is manufactured by applying a moisture-curable polyurethane resin to a fabric woven using glass fibers or polyester yarns, or a fabric woven by adding elastic fibers thereto. The casting tape manufactured using the water-curable polyurethane resin is a tape which can be cured by reacting a prepolymer formed by the reaction of an isocyanate with a polyol with water to perform a water-isocyanate reaction. In other words, the casting tape coated with the prepolymer is immersed in water at 20 to 30 ° C. for about 2 to 3 seconds, squeezed once or twice and wound around the affected part of the patient.

U.S. Patent No. 4,433,680 discloses a casting band prepared by applying a polyurethane prepolymer to an open-weave fabric, wherein the polyurethane prepolymer is an aromatic polyisocyanate, a polyol and a dimorpholino diethyl ether (dimorpholino). diethylether) and stabilizers and antifoams may be used. In this US patent, diphenylmethane diisocyanate containing a carbodiimide group was used as the aromatic polyisocyanate.

U. S. Patent No. 4,667, 661 discloses a casting tape having a friction coefficient of 1.2 or less by applying an isocyanate-functional prepolymer which is a water-curable resin containing a lubricant composed of a hydrophilic group to a fabric. The hydrophilic groups are derived from polyols or polyethoxylated fatty alcohols, the lubricant consists of sulfonate groups, and includes alkyl sulfate surfactants, anionic polyethoxylated surfactants, and the like.

U.S. Patent No. 5,405,643 (Korean Patent Publication No. 96-700028) mechanically compresses a fabric sheet to provide a microcrepe structure on the fibers of the fabric sheet and a curable liquid resin on the fabric sheet. Disclosed is a method of manufacturing an orthopedic casting bandage consisting of a step of applying.

U.S. Patent No. 5,480,708 (Korean Patent Publication No. 96-28926) discloses a casting tape in which a water-reactive polyurethane prepolymer is applied to a fibrous substrate, wherein the fibrous substrate is 99.75 to 65% of inelastic fibers and 0.25 to 35% elastic fiber, the elastic fiber is a blend of ethylene / propylene rubber and polypropylene resin, the fibrous substrate is a 3 bar Raschel knitted fabric, the elastic fiber is located at bar 3 of the substrate The inelastic fibers are high strength polyesters.

Korean Patent Publication No. 97-167 discloses an orthopedic fixing tape which is manufactured by immersing a fabric in which a hole between said engagement and reversal yarn is largely woven in a polyurethane resin, using polyester filament as engagement and cross yarn. have.

Benzoyl chloride, used as a conventional polyurethane prepolymer stabilizer, is odorless and therefore unsuitable for use in casting tapes used by patients. PLURONIC F108, which is used as a conventional lubricant, is a reactive lubricant that reacts with an isocyanate group of polyurethane prepolymer as a polyol, and has a disadvantage of increasing viscosity during the procedure and is harmful to skin.

Conventional casting tapes made of glass fiber have fine glass powder when cutting with a chainsaw, which may cause lung cancer when inhaled, incineration after use, difficult to disintegrate, and not decomposed naturally. Hygiene hazards are included.

Conventional casting tapes made using polyester fabrics have the disadvantage of having the lowest deadly compressive strength as casting tapes compared to those made of glass fibers.

Therefore, the present inventors have developed an orthopedic casting tape and a method of manufacturing the same, which have improved compressive strength and have a soft and smooth feel while eliminating environmental / hygienic harmful factors, which are disadvantages of the conventional casting tape manufactured as described above. It was early.

It is an object of the present invention to provide casting tapes with as little risk to the skin as possible by using sodium lauryl sulfate as lubricant for polyurethane resins.

Another object of the present invention is to provide a casting tape having improved compressive strength while using a polyester fabric which is free of environmental / sanitary hazards.

Another object of the present invention is to provide an orthopedic casting tape that is smooth and soft to the touch using polyester fabric.

It is still another object of the present invention to provide a method for producing an orthopedic casting tape having no odor problem compared to conventional benzoyl chloride by using pyrogallic acid and dimethylropropionic acid as stabilizers of polyurethane resins. .

The above and other objects of the present invention can be achieved by the present invention described below.

The orthopedic casting tape according to the present invention is a 2,2'-dimorpholinyldialkyl ether (DMDEE) as a catalyst on a fibrous substrate woven with 420 denier polyester filament yarns, and pyrogaric as a stabilizer. It is prepared by applying a resin solution composed of a polyurethane prepolymer containing acid and dimethylropropionic acid, sodium lauryl sulfate as a lubricant, and a silicone type antifoaming agent.

The fibrous substrate used in the present invention is a 4 bar Raschel knit fabric woven using both 420 and denier polyester filament yarns. The polyurethane prepolymer consists of diphenylmethane diisocyanate (MDI), polypropylene glycol (PPG), and polyalkylene glycol (PG). The composition ratio of the polyurethane resin according to the present invention is 50 to 70% by weight, 25 to 35% PPG, 5 to 15% PG, 0.1 to 1.0% DMDEE, and 1 to 5% sodium lauryl sulfate. Pyrogallic acid is 0.1 to 0.5%, dimethylropropionic acid is 0.1 to 0.5%, and silicone type antifoaming agent is 0.1 to 1.0%. Hereinafter, the content of the present invention will be described in detail.

Orthopedic casting tapes according to the present invention are woven into 4 bar Raschel knit fabric using 420 denier polyester filament yarns to weave fibrous substrates. The polyester filament yarn uses 420 tenor for both working and cross yarns, and weaving into 4 bar raschel instead of conventional 2 bar or 3 bar to create a bulky and smooth surface of polyester fabric through proper knitting method. As a result, a very improved compressive strength was obtained. In addition, it is a three-dimensional piece of tissue that is difficult to make at 2 bar or 3 bar to prevent aeration problems.

The woven fabric was passed through water at 80 ° C. or higher, and then dried to improve elasticity, remove foreign matters, and sanitize the fabric.

The woven polyester fabric is immersed in a polyurethane resin solution to apply a resin solution. The polyurethane resin solution contains a polyurethane prepolymer as a main component and contains a catalyst, a stabilizer, a lubricant, and an antifoaming agent. Polyurethane prepolymers consist of diphenylmethane diisocyanate polypropylene glycol and polyalkylene glycols. 2,2'-dimorpholinyldialkyl ether is used as a catalyst for the casting tape to react with water to advance the water-isocyanate reaction.

In the present invention, pyroglylic acid and dimethylropropionic acid are used together as a stabilizer. Pyrogallic acid and dimethyl propionic acid are odorless, nontoxic and not harmful to the human body. Although benzoyl chloride has been used as a stabilizer when manufacturing a conventional casting tape, this causes problems in use because of its high toxicity and odor.

In the present invention, sodium lauryl sulfate is used as a lubricant. Conventional PLURONIC F108 is a reactive organic lubricant which reacts with isocyanates as a polyol, but sodium lauryl sulfate is a relatively safe organic salt lubricant added to toothpaste, shampoo and the like.

In this invention, a silicone type antifoamer is used as an antifoamer.

Diphenylmethane diisocyanate forming the polyurethane prepolymer is used in 50 to 70% by weight based on 100% by weight of the total resin, 25 to 35% by weight of polypropylene glycol, and 5 to 15% by weight of polyalkylene glycol. . 2,2'-dimorpholinyldialkyl ether as a catalyst contained in the polyurethane prepolymer is 0.1 to 1.0% by weight based on 100% by weight of the total resin, sodium lauryl sulfate used as a lubricant is 1 to 5% by weight The pyroglylic acid used as a stabilizer is 0.1 to 0.5% by weight based on 100% by weight of the total resin, dimethylropropionic acid is 0.1 to 0.5% by weight, and the silicone type antifoaming agent is 0.1 to 1.0% by weight based on 100% by weight of the total resin. .

The woven polyester 4 bar Raschel knit fabric is immersed in the polyurethane resin solution to prepare an orthopedic casting tape. The method for producing an orthopedic casting tape by immersing a fibrous substrate in a polyurethane resin solution can be easily carried out by those skilled in the art.

The orthopedic casting tape thus prepared is packaged and distributed as a product. If the casting tape is to be used, it is immersed in water at 20 to 30 ° C. for about 2 to 3 seconds, and then squeezed out at least 1 to 3 times to the affected part of the patient. Wind on After about 10 minutes, the casting tape is cured by the water-isocyanate reaction and fixed to the affected part.

The invention is illustrated in detail by the following examples, which are illustrative only of specific embodiments of the invention and are not intended to limit or limit the scope of the invention.

Examples 1 to 3

Both the solid and horizontal yarns were woven from 4 bar 9 gauge Raschel knit fabrics 3 inches wide using 420 denier polyester yarns, immersed in water at least 80 degrees for at least 10 seconds, and then dried sufficiently.

Three polyurethane resin solutions were prepared according to Table 1 below, and each of the resin solution was immersed in the 4-bar Raschel knit fabric. The composition of the polyurethane resin solution in Table 1 means all by weight. A knitted fabric coated with a resin solution was cut to 3.6 m in length and placed in an aluminum wrapping paper to prepare an orthopedic casting tape.

The casting tapes prepared in Examples 1-3 were immersed in water according to ASTM F1536 and squeezed 3 times by hand and then set for 275 seconds.

The set sample was measured after 24 hours in accordance with Modified ASTM F1536 to determine the bonding strength, the results are shown in Table 2.

According to ASTM F1536, the compressive strengths of the samples of Examples 1 to 3 after 30 minutes, 60 minutes, and 24 hours were measured, respectively, and the results are shown in Table 2.

Comparative Example 1

A casting tape was prepared in the same manner as in Example 1, except that the 2-bar Raschel knit fabric was woven using Example 420 denier / 96 filament polyester yarn in Example 1, and the physical properties thereof were measured. Indicated.

Comparative Example 2

Table 3 shows the compressive strength of Delta-Cast Elite 3 inch x 4 yards manufactured by Johnson & John in the same manner as in Examples 1-3. Delta-Cast Elite products are characterized by being woven into 3-bar Raschel fabric using 150 denier polyester yarns and elastic fibers instead of conventional fiberglass fabrics.

Comparative Example 3

Scotchcast Plus 3 inch x 4 yards manufactured by 3M company was shown in Table 3 by measuring the compressive strength in the same manner as in Examples 1-3. Scotchcast Plus is a two-bar Raschel fabric with glass fibers.

As shown in the above Examples and Comparative Examples, it can be seen that the casting tape according to the embodiment of the present invention has a relatively good compressive strength as compared to the conventional casting tape.

The present invention is smoother than the surface of a fabric woven with 2 bar or 3 bar by woven 420 denier polyester filament yarns into 4 bar laselle to weave the fibrous substrate. It is softer than the fabric made of glass fiber by using the fabric dipped in hot water over 80 ℃ and dried. Odor problems were eliminated by using pyrogallic acid and dimethylopropionic acid as stabilizers of polyurethane resins, and safety was improved by using sodium lauryl sulfate as a lubricant. Lubricant was used.

The casting tape prepared by applying the polyurethane resin solution prepared with the above additives to the woven fabric of 4 bar laselle is significantly improved in compressive strength compared to other products that do not use the conventional glass fiber, it is made of glass fiber The invention has the effect of providing an orthopedic casting tape that is close to the cast tape and has an environmentally friendly, hygienic, soft and smooth feel.

Simple modifications and variations of the present invention fall within the protection scope of the present invention and the specific protection scope of the present invention will be apparent from the appended claims.

Claims (5)

2,2'-dimorpholinyldialkyl ether (DMDEE) as catalyst, pyrogallic acid and dimethylropropionic acid as stabilizer, sodium lauryl sulfate as lubricant, and silicone A method for producing an orthopedic casting tape, which is prepared by applying a polyurethane resin solution composed of a polyurethane prepolymer containing a type antifoaming agent to a 4 bar Raschel knitted fabric made of polyester filament yarn. The method of claim 1, wherein the polyurethane prepolymer is made of diphenylmethane diisocyanate (MDI), polypropylene glycol (PPG), and polyalkylene glycol (PG) The manufacturing method of the orthopedic casting tape. The method for producing an orthopedic casting tape according to claim 1, wherein the polyester filament yarn is 420 denier. According to claim 1, wherein the composition ratio of the polyurethane resin solution is 50 to 70% by weight ratio, 25 to 35% PPG, 5 to 15% PG, 0.1 to 1.0% DMDEE, sodium lauryl sulfate A method for producing an orthopedic casting tape, which is 1 to 5%, 0.1 to 0.5% of pyrogallic acid, 0.1 to 0.5% of dimethylropropionic acid, and 0.1 to 1.0% of a silicone type antifoaming agent. Orthopedic casting tape prepared according to any one of claims 1 to 4.