JPH0512442B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a female mold material for manufacturing a wig base. [Prior Art] Conventionally, one method for making a wig-based mold is to cover the patient's head with a thin plastic film, and then cut an adhesive tape such as cellophane tape to a certain length on top of it. , hold this vertically, horizontally,
There is a way to create them by pasting them diagonally in multiple layers. Another method is to use a sheet of thermoplastic synthetic resin, such as transpolyisoprene resin, which can be softened and molded by heating at relatively low temperatures and hardened while retaining its molded shape when it is cooled to room temperature. was molded into a plate shape, a frame was attached around it, and 50 transpolyisoprene resin plates were
It is heated to ~60℃ to soften it, and the patient presses it against the patient's head while supporting it with both hands, cools it, and maintains the shape of the head to create a female mold. The method of manufacturing a wig base by filling a mold with plaster to form a female mold and applying a synthetic resin solution as a wig base coating agent, such as a urethane prepolymer solution, to the molded female mold is disclosed in Japanese Patent Application Laid-Open No. 1973-
It is described in Publication No. 116804. [Problems to be Solved by the Invention] However, these methods have the following drawbacks. In other words, the method of pasting multiple layers of cellophane tape is (a) complicated. (b) The patient cannot perform the work alone. (c) A smooth molding surface cannot be obtained. etc. On the other hand, in the method of using a softened transpolyisoprene resin plate, the resin plate heated to 50 to 60°C is pressed against the head, so it is hot, and even if the head is covered with an insulating sheet, it will not be hot. This may cause burns. Furthermore, when making molds by softening transpolyisoprene,
It lacks fluidity, does not stretch sufficiently, and requires a great deal of force when the patient supports it on his or her own. In addition, transpolyisoprene resin plates are sensitive to ultraviolet rays and deteriorate when exposed to sunlight, making them unusable. To overcome these drawbacks, a method has been proposed that uses a poly-ε-caprolactone resin plate, which is inexpensive, softens at temperatures below 40°C, and is resistant to ultraviolet rays. There are problems like this. That is, when this poly-ε-caprolactone resin plate, which is a crystalline polymer, is softened, the resin melts to the extent that it runs off at a temperature of about 40° C., and wrinkles occur, making it difficult to work with. In view of this situation, the present inventors have completed the present invention as a result of intensive studies. [Structure of the Invention] That is, the present invention provides a female mold material for manufacturing a wig base comprising poly-ε-caprolactone, the material being coated with polyurethane. ”. Polycaprolactone, which is a polymer for producing the resin plate that is the base material of the female mold material for producing a wig base of the present invention, can be obtained, for example, as follows. That is, when ε-caprolactone is polymerized to form polycaprolactone, water or a compound having hydroxyl groups at both ends is used as a polymerization initiator. Examples of the polymerization initiator include alkylene glycols such as ethylene glycol, propylene glycol, 1,4-butanediol, 2,3-butylene glycol, pentamethylene glycol, and hexamethylene glycol. Among these initiators, those having molecular weights suitable for use in the female mold material resin plate for manufacturing wig bases of the present invention.
Water or ethylene glycol are suitable for producing poly-ε-caprolactone resins of 5,000 to 200,000. Poly-ε-caprolactone is produced by adding the above-mentioned polymerization initiator to ε-caprolactone monomer, preferably using a catalyst, and under stirring, usually at a temperature of 120 to 230%.
It is obtained by reacting at a temperature of preferably 140 to 220°C for several hours. Various organic or inorganic metal compounds are known as catalysts for ring-opening polymerization of lactone monomers. Specifically, there are the following. Tetrabutyl titanate, tetraisopropyl titanate,
These include compounds such as tetraethyl titanate, dibutyltin oxide, dibutyltin laurate, tin octylate, and stannous chloride. Also, the amount of these catalysts used is based on the starting material.
0.1-1000ppm, preferably 0.5-500ppm. The number average molecular weight of the obtained poly-ε-caprolactone resin is 5,000 to 200,000, but it is preferably 10,000 to 100,000 for use as a base resin for the female mold material for producing a wig base of the present invention. Next, the procedure for producing the "polyurethane-coated female mold material for manufacturing a wig base" of the present invention will be described below. (a) Preferably, the poly-ε-caprolactone resin, which is the base resin obtained as described above, is first pelletized using an extruder or the like. (2) Next, commonly used molding methods,
That is, it is molded by press molding, extrusion molding, injection molding, casting, etc. into a resin plate having a thickness of about 0.3 to 5 mm and serving as a base material for a female mold material for manufacturing a wig base. In this case, it is necessary to consider the molding conditions so as to suppress the residual strain caused by molding inside the resin as much as possible. (c) Next, this molded wide or long continuous plate-shaped resin is made into a shape that is easy to work with, and
A certain size appropriate for material usage efficiency, e.g. 40
First, individual resin plates are made by cutting them into rectangular or square sizes of approximately cm x 30 cm, which will serve as the female mold material base material for manufacturing the wig base. Next, a procedure for coating polyurethane on each rectangular or square resin plate formed as described above will be explained. (a) First, a polyurethane resin solution having a solid content concentration of 5 to 50%, preferably about 20%, as described later, is prepared. (b) The individual resin plates cut into a certain size are coated in this polyurethane resin solution by dip coating or by casting with an adapter, bar coater, etc. (c) The individual resin plates coated with the polyurethane resin solution are dried and, if necessary, the urethane is crosslinked to form a film. Drying and crosslinking can be left at room temperature, or it is possible to accelerate the crosslinking reaction by heating to 30 to 50°C. Crosslinking is carried out when it is necessary to increase the elasticity of the polyurethane. The preferred thickness of the urethane coating is 50~
500μ, preferably 100-200μ. Note that the molded wide or long continuous plate resin may be coated with a urethane film and then cut into a certain size. Next, the polyurethane resin solution used as the coating material will be described. For example, polyols such as lactone polyols, which are soft segments with a molecular weight of about 5000, polymerized in a solvent such as toluene, methyl ethyl ketone, dimethyl formamide, etc. using ethylene glycol as an initiator, diisocyanate compounds, which are hard segments, and chain extenders, which are hard segments. to obtain a urethane resin solution. Generally, when producing polyurethane resins, mechanical properties such as strength (especially tensile strength) and modulus cannot be adjusted using only polyols and diisocyanate compounds, so a chain extender, which is a hard segment, is also used. As chain extenders that can be used, there are low molecular weight compounds having active hydrogen, and specific examples thereof include the following. ethylene glycol, propylene glycol,
1,4-butanediol, 2-methylpropanediol, neopentyl glycol, bentanediol, 1,6-hexanediol, ethylenediamine, propylenediamine, hydrazine, isophoronediamine, metaphenylenediamine, 4,
Examples include 4'-diaminodiphenylmethane, diaminodiphenyl sulfone, and 3,3'-dichloro-4,4'-diaminodiphenylmethane. Among them, especially ethylene glycol, 1,
4-butanediol and 1,6-hexanediol are particularly suitable chain extenders because they are industrially mass-produced and readily available. Diisocyanate compounds that can be used include the following. That is, 2,4 tolylene diisocyanate,
2,6 tolylene diisocyanate, 4,4' diphenylmethane diisocyanate, toridine diisocyanate, toluene diisocyanate, xylene diisocyanate, hydrogenated 4,4' diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 4,4' dicyclohexylmethane diisocyanate , 1,5 naphthalene diisocyanate, carbodiimide modified
Examples include MDI, xylylene diisocyanate, etc., and one type or two or more types can be used. Among the above diisocyanate compounds, toluene diisocyanate, diphenylmethane diisocyanate, and isophorone diisocyanate are particularly suitable diisocyanate compounds because they are industrially mass-produced and easily available. Furthermore, among these, isophorone diisocyanate is particularly preferred since it has no yellowing property. It is better to dehydrate the solvent used, such as toluene. It is convenient to adjust the solid content concentration of the polyurethane resin solution thus obtained to 5 to 50%, preferably about 20%, in order to facilitate coating or dipping operations for forming a film. Furthermore, if it is necessary to strengthen the crosslinking of polyurethane, add 1 to 10 parts of isocyanate adduct to the urethane solution and coat with the above method,
It is also possible to accelerate the crosslinking reaction by leaving it at room temperature or heating it to 30 to 50°C. Crosslinking is carried out when it is necessary to increase the elasticity of the polyurethane. The isocyanate adduct referred to here specifically refers to Coronate L, Coronate
EH (both manufactured by Nippon Polyurethane Co., Ltd., trade names), etc. A solvent-type urethane solution for coating or dipping is more suitable than an emulsion-type urethane solution. The reason for this is that a film formed from a solution type has good adhesion to the base polycaprolactone resin plate, but a film formed from an emulsion type has poor adhesion. The base material may be coated with polyurethane resin on only one side, but it is preferable to coat both sides. The thus obtained female mold material for wig base production, which is mainly composed of poly-ε-caprolactone and coated with a polyurethane film, is softened by heating at 60 to 70°C, and then the temperature is lowered to 40 to 45°C. Use it by pressing it against your head as described above. At this time, since it is coated with polyurethane, it will not flow excessively and sag, and there is no need to apply excessive force when pressing it against the head for molding, making molding extremely efficient. I can recommend the work. The main component of the resin that is the base material of the material of the present invention is polycaprolactone, but it is also possible to add other synthetic resins and plasticizers that are compatible with polycaprolactone, and commonly used stabilizers. , fillers, colorants, and other additives may also be added. [Effects of the Invention] The polyurethane-coated female mold material for manufacturing wig bases of the present invention has appropriate elasticity due to the polyurethane, and when melted and softened, it is less prone to film sag or wrinkles than a single polycaprolactone sheet. It will be improved so that there is no such problem. Also, due to its moderate elongation, the force required for molding can be reduced compared to polyisoprene. At the same time, conventional polycaprolactone single sheets had disadvantages such as sticking to hair and skin when melting and softening, and difficulty in releasing from the mold. However, the polyurethane-coated material of the present invention eliminates the above-mentioned sticking and has good mold release properties. It was also good. The effects of the present invention will be explained below using Examples. Synthesis Example 1 Dehydrated toluene was placed in a four-necked flask equipped with a nitrogen introduction tube, a thermometer, a cooling tube, and a stirring device.
1000 g of poly-ε-caprolactone with a number average molecular weight of 5000 using ethylene glycol as an initiator.
917.7g, toluene diisocyanate (TDI-80)
and 21.7 g of 1,6-hexanediol, which is a chain extender, were reacted at 80°C for about 2 hours. Then, 3000 g of toluene was added and the reaction was continued for another 6 hours to produce urethane with a solid content of 20%. A solution was obtained. This material is called urethane A. Synthesis Example 2 Using the same equipment as Synthesis Example 1, 1000g of toluene
Thoroughly dissolve 0.02 g of dibutyltin dilaurate in water, add 886.2 g of polybutylene glycol adipate (number average molecular weight 3500), 95.6 g of isophorone diisocyanate, and 18.2 g of 1,4-butanediol as a chain extender, and heat at 80°C. After reacting for about 4 hours, 3000 g of toluene was added and the reaction was continued for another 4 hours to obtain a urethane solution with a solid content of 20%. This product is called urethane B. Synthesis Example 3 Using the same equipment as Synthesis Example 1, 1000g of toluene
By thoroughly dissolving 0.02 g of dibutyltin dilaurate in water, poly-ε-caprolactone with a number average molecular weight of 10,000 using ethylene glycol as an initiator was prepared.
g, 45.9 g of hexamethylene diisocyanate,
After adding 11.7g of ethylene glycol as a chain extender and reacting at 80℃ for about 4 hours, toluene was added.
Add 3000g and react for another 4 hours to reach a solid content of 20%.
A urethane solution was obtained. This product is called urethane C. Comparative Example 1 Using poly-ε-caprolactone with a number average molecular weight of 70,000, a shape of 300×270 was formed by press molding.
A sheet having a thickness of ■×3■ was obtained. Comparative Example 2 A sheet of the same shape was obtained in the same manner as in Comparative Example 1 using poly-ε-caprolactone having a number average molecular weight of 40,000. Comparative Example 3 Using poly-trans-isoprene, a sheet of the same shape was obtained in the same manner as in Comparative Example 1. Example 1 A sheet similar to that obtained in Comparative Example 1 was dip-coated with urethane A obtained in Synthesis Example 1, and dried at room temperature for 4 hours to obtain a urethane-coated sheet. Example 2 A sheet similar to that obtained in Comparative Example 1 was dip-coated with urethane A obtained in Synthesis Example 1 to which 3 parts of Coronate EH was added, and 4 parts of Coronate EH was added at room temperature.
After drying for an hour, a urethane coated sheet was obtained. Example 3 A sheet similar to that obtained in Comparative Example 2 was dip-coated with urethane A obtained in Synthesis Example 1 to which 3 parts of Coronate EH was added, and 4 parts of Coronate EH was added at room temperature.
After drying for an hour, a urethane coated sheet was obtained. Example 4 Using poly-ε-caprolactone with a number average molecular weight of 50,000, the shape was 300 mm x 270 mm by press molding.
A sheet with a thickness of mm x 3 mm was obtained. This product was dip-coated with 4 parts of Coronate-L added to the urethane B obtained in Synthesis Example 2, and dried at room temperature for 4 hours to obtain a urethane-coated sheet. Example 5 Poly-ε-caprolactone with a number average molecular weight of 50,000 was press-molded into a shape of 300 mm x 270 mm.
A sheet with a thickness of 3 mm was obtained. Synthesis Example 2
The urethane C obtained above was dip-coated with 4 parts of Coronate-L and dried at room temperature for 4 hours to obtain a urethane-coated sheet. The sheets obtained in Comparative Examples 1 to 3 and Examples 1 to 5 were evaluated as female mold materials for wig production by the following method. Evaluation item: Dragging of polycaprolactone resin sheet when heated (cm) The sheet is inserted into a wooden frame, and the entire surface of the sheet is heated with a heater, and heating is stopped when it becomes moderately soft. At this time, measure how far the softened sheet hangs down in the center of the wood. Force required to make a mold (Kg) After heating and melting, cool to the point that it is not hot to touch the skin, press it against a doll's head placed on a scale, and measure the force (Kg) required to make a mold. Adhesion to the skin Press the molten sheet with your fingers and check the adhesion by touching it with your fingers. Those with no sense of adhesion were rated as ○ those with adhesion were rated as ×. After pressing it against the head, it was cooled and solidified, and the accuracy of the molding was judged. ○-Good, ×-Poor The evaluation results are summarized in Table-1.

[Table] From the results in Table 1, polyurethane coating
It is clearly seen that sagging during heating can be prevented, the force required for molding can be reduced, and adhesion to the skin can be dramatically improved.

Claims (1)

[Scope of Claims] 1. A female mold material for manufacturing a wig base made of poly-ε-caprolactone, characterized in that the material is coated with a polyurethane coating. 2 The number average molecular weight of poly-ε-caprolactone is
40,000 to 200,000. The female mold material for manufacturing a wig base according to claim 1. 3 Polyurethane has a number average molecular weight of 2000 to 20000
The female mold material for manufacturing a wig base according to claim 1, which is synthesized using a polyol of. 4. The female mold material for manufacturing a wig base according to claim 1, wherein the polyurethane is synthesized using any one of toluene diisocyanate, diphenylmethane diisocyanate, and isophorone diisocyanate as a main component. 5 Polyurethane is ethylene glycol, 1,
The female mold material for producing a wig base according to claim 1, which is synthesized using at least one of 4-butanediol and 1,6-hexanediol as a chain extender.