JP2001138340A - Method for manufacturing silicone sheet and container for manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a method for manufacturing a silicone sheet (surgical bandage) excellent in self-adhesiveness, protection properties and followability and also excellent in physical strength. SOLUTION: In manufacturing a silicone sheet by simultaneously heating and curing silicone for forming a silicone elastomer and silicone for forming a silicone gel by using a plastic container, static electricity accumulated on the container at a time of filling is removed by using a lid or the like comprising a conductive metal or a plastic material coated with a conductive substance to obtain the silicone sheet (surgical bandage) in a high yield with high efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an efficient new method for producing a surgical bandage made of a silicone sheet which is excellent in adhesiveness, protection and followability and physical strength, and is used in such a production method. The present invention relates to a container for producing a silicone sheet.

[0002]

BACKGROUND OF THE INVENTION Surgical bandages are used to protect affected skin areas, such as burns and other injuries, and to promote wound healing. Among such surgical dressings, for treatment of hypertrophic scars and keloids, compression made of a material such as elastic fiber or polyurethane, which is fully protected from the outside while taking into account the functionality such as articulation, is used. Bandages are widely used. However, the conventional compression bandages cannot be expected to have a sufficient therapeutic effect, and have inherent limitations in the ability to follow joint movements due to the characteristics of the material.
On the other hand, K. Perkins et al. Found that silicone gel sheets are effective in treating burn scars and the like through clinical experiments, and have proposed such silicone gel sheets as a new treatment for hypertrophic scars and keloids, which can replace conventional bandages [Burns]. , Volume 9, p. 201
204 (1982)].

[0003] However, the silicone gel sheet used here has good plasticity and thus is well adapted to the human body, and is excellent in followability to joint movements, but has no or very low adhesion. Because it is sticky, to fix it,
Separately, bandages or bandages are required. The use of this bandage or bandage rather impairs the followability based on the plasticity of the silicone gel sheet, and the use of the bandage tends to cause rash or the like depending on the constitution and has a problem that long-time use is disliked. As a method of coping with this problem, it is conceivable to impart tackiness to the silicone gel sheet, but a silicone gel sheet having high tackiness is insufficient in strength and easily deformed,
Due to the inconvenience of handling, a silicone gel sheet reinforced with a woven fabric, nonwoven fabric or film inside or on one side has been proposed (see JP-A-3-75055). However, the reinforcement with a film or a nonwoven fabric impairs the followability of the silicone gel sheet as in the use of the bandage, the bandage, etc., and the use of shrink-processed gauze lacks the reinforcement and follows It is not satisfactory in terms of sex.

Further, a laminated product in which a silicone gel sheet is reinforced with a silicone elastomer sheet has been proposed (see JP-A-1-34370). Although the above-mentioned drawbacks have been improved to some extent also in this laminated product, the viscosity is insufficient and it is still not sufficient. The present applicant succeeded in developing a silicone sheet in which the characteristics of the conventional surgical dressing were improved by simultaneously curing the silicone for forming a silicone gel and the silicone for forming a silicone elastomer, and applied for a patent. (Japanese Patent Application No. 10-134923
issue). However, when the silicone for forming a silicone gel and the silicone for forming a silicone elastomer are simultaneously cured in an insulative plastic container, the uncured silicone for forming a silicone gel is mainly released and splatters, and the side surface or the inner surface of the lid of the plastic container. The phenomenon that droplets adhere to the surface occurs, which causes a manufacturing problem of lowering the product yield.

[0005]

DISCLOSURE OF THE INVENTION The present inventor has conducted intensive studies to solve the above-mentioned problems in the production of a silicone sheet. As a result, the phenomenon in which uncured silicone for forming a silicone gel scatters as droplets is considered to be an insulating plastic container. It has been found that the cause is the static electricity accumulated in the lid, and that when this static electricity is removed, a silicone sheet having excellent characteristics can be obtained at a high yield without such a phenomenon.
The present invention is based on this finding.

That is, the present invention provides a novel method for producing a silicone sheet as described in the following paragraphs, and provides a container for producing a silicone gel sheet as described in the following paragraphs used in such a production method. .

[0007] A method for producing a silicone sheet, characterized in that predetermined amounts of silicone for forming a silicone elastomer and silicone for forming a silicone gel are sequentially filled in a polypropylene container, and then static electricity in the container is removed, followed by heating and curing. .

A predetermined amount of the silicone for forming the silicone elastomer and the predetermined amount of the silicone for forming the silicone gel are sequentially filled in a polypropylene container, and the cover is made of a plastic material in which the container is coated with a conductive metal or a conductive metal or a conductive organic substance. And then heating and curing the silicone sheet.

The method for producing a silicone sheet according to the above item, wherein the lid is made of a conductive metal selected from silver, copper, iron, brass, bronze or stainless steel.

[0010] The method for producing a silicone sheet according to the above item, wherein the lid is made of a plastic material coated with a conductive metal or a conductive organic substance.

A predetermined amount of the silicone for forming the silicone elastomer and the predetermined amount of the silicone for forming the silicone gel are sequentially filled in a polypropylene container, and the cover is made of a plastic material in which the container is coated with a conductive metal or a conductive metal or a conductive organic substance. A method for producing a silicone sheet, comprising: completely removing static electricity by grounding, followed by heating and curing.

A method for producing a silicone sheet, wherein the container is made of a conductive metal or a plastic coated with a conductive metal or a conductive organic substance, wherein the container is made of a polypropylene used for a heating and curing reaction of silicone. Container.

A container made of polypropylene used for a heating and curing reaction of silicone, wherein the container has a bottom surface and 95 to
A container for producing a silicone sheet having a peripheral wall having an angle of 120 degrees. Hereinafter, the present invention will be described in detail.

The production method according to the present invention can achieve the object if static electricity accumulated in the container at the time of filling is substantially removed before curing of the silicone. As a production method, a method in which a lid made of the following conductive material is used as the lid of the container is preferable. As a material for the lid, gold, which effectively removes static electricity,
Examples of the conductive metal include silver, copper, iron, lead, tin, zinc, aluminum, chromium, nickel, cobalt, and alloys containing these metals. Among them, silver, copper, iron, brass, bronze, stainless steel, and the like are suitable from the viewpoint of workability, economy, corrosion resistance, and the like, and copper or stainless steel is particularly preferable in consideration of corrosion resistance and economy. Material. On the other hand, as the material of the lid, polypropylene, polyethylene, polyphthalate, polyacryl,
When using plastic materials such as polyvinyl chloride,
It is a preferable embodiment to use a material whose surface is coated with a conductive substance. As the conductive material to be coated,
Alkyl sulfates, alkyl allyl sulfonates, dialkyl sulfosuccinates, and other sulfonates or sulfates having an unsaturated bond in the molecule, which are usually used as antistatic agents, succinates, succinates, alkyl phosphates, alkyl ammoniums An organic conductive substance typified by a polymer substance such as a salt, or the above-described various conductive metals is used as a coating material. Known methods such as a coating method, a vapor deposition method, and a plating method are employed as means for coating these conductive substances.

The production method according to the present invention can be applied to a reaction for forming a silicone gel by heating and curing a known silicone for forming a silicone gel. Silicone is a cured product containing organopolysiloxane as a main component and having a low crosslinking density even when cured by heat.
Penetration by 2220 or ASTM D1403 (1/4 cone) is 10 or more (usually about 10 to 200)
A composition that can obtain the characteristics of
In the hardness measurement by K6301, the measured value (rubber hardness value) becomes 0, which corresponds to a material having low hardness (ie, soft) so as not to show an effective rubber hardness value. Further, the silicone for forming an elastomer is a silicone-based silicone having a relatively high crosslinking density at the time of thermal curing as compared with the silicone for gel and containing an organopolysiloxane as a main component.
Those which can obtain an effective rubber hardness value (> 0) according to K6301 are suitable. Details of each of these silicone compositions are provided in the prior application.

[0016]

Next, an outline of a method for producing a silicone sheet according to the present invention will be described. First, the silicone elastomer-forming silicone is filled in an insulating container of a predetermined size with an amount necessary to form a sheet having a desired thickness,
Let stand still. This standing gives a flat surface and removes air bubbles in the silicone for forming the silicone elastomer. At this time, it is preferable that the silicone for forming the silicone elastomer is simultaneously applied to the inner surface of the peripheral side wall of the container to be filled with the silicone for forming the silicone gel to be filled next. This purpose is especially for surgical dressings.
This is because the side surface of the sheet is coated with an elastomer to reduce the adhesiveness of the portion where the gel layer is exposed, thereby improving the handleability. For this purpose, since the silicone elastomer-forming silicone is fluid, it is necessary to use a container in which the angle between the bottom surface and the wall of the container is 95 degrees or more, and the angle is in the range of 95 degrees to 120 degrees. Although the container can be selected, a container having an angle of about 105 degrees was preferred from the viewpoint of usability of the product.

Next, a predetermined amount of the silicone gel forming silicone is filled on the uniformly filled silicone for forming the silicone elastomer. After removing the static electricity accumulated in the container, the container filled with each silicone is covered with a lid made of the conductive metal or a lid coated with a conductive substance, or grounded as necessary. It is heated and cured in a hot-air circulation oven or the like to form a product. The production method according to the present invention is useful because it can be applied to the production of the silicone sheet of Japanese Patent Application No. 10-134923 previously proposed. In this production method in which static electricity was removed, the incidence of defective products was improved by 10 to 30% compared to the conventional production method in which static electricity was not removed, and the occurrence of defective products due to static electricity was almost eliminated.

[0018]

EXAMPLES The present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

Example 1 To 2.96 g of a mixture of methylvinylpolysiloxane / silicone resin / platinum catalyst was added 0.1 ml of dimethylpolysiloxane.
59 g is added and mixed well, and 0.45 g of a mixture of methyl hydrogen polysiloxane, dimethyl polysiloxane and 1-ethylcyclohexane is added and mixed.
This was spread in a PP tray having a depth of 10 mm and an angle between the bottom and the wall of about 105 degrees, and 13.00 g of a methylvinylpolysiloxane / platinum catalyst admixture and methylvinylpolysiloxane / methylhydrogen were added. A mixture of 13.00 g of the polysiloxane blend is poured into a sheet having a thickness of about 5 mm as a whole. Next, this PP
Cover the container with a stainless steel plate lid and let it stand.
After curing at 0 ° C. for 2 hours, no gel adhered to the lid of the stainless steel plate, and the desired silicone sheet having a good weight was obtained with high yield.

Example 2 To 2.96 g of a mixture of methylvinylpolysiloxane, silicone resin and platinum catalyst was added dimethylpolysiloxane 0.1%.
59 g is added and mixed well, and 0.45 g of a mixture of methyl hydrogen polysiloxane, dimethyl polysiloxane and 1-ethylcyclohexane is added and mixed.
This was spread in a PP tray having a depth of 10 mm and an angle between the bottom and the wall of about 100 degrees, and 13.00 g of a methylvinylpolysiloxane / platinum catalyst mixture and methylvinylpolysiloxane / methylhydrogen were added. A mixture of 13.00 g of the polysiloxane blend is poured into a sheet having a thickness of about 5 mm as a whole. Next, this PP
Cover the container with a copper lid and let it stand.
After curing at 0 ° C. for 2 hours, no gel was observed on the copper lid, and a silicon cone sheet of the desired weight was obtained with a high yield.

Example 3 Dimethylpolysiloxane was added to 2.96 g of a mixture of methylvinylpolysiloxane, silicone resin and platinum catalyst.
59 g is added and mixed well, and 0.45 g of a mixture of methyl hydrogen polysiloxane, dimethyl polysiloxane and 1-ethylcyclohexane is added and mixed.
This is 10 mm deep and the angle between the bottom and the wall is about 103.
The mixture was spread in a tray made of PP at 5 degrees, and 13.00 g of a mixture of methylvinylpolysiloxane / platinum catalyst and 13.00 g of a mixture of methylvinylpolysiloxane / methylhydrogenpolysiloxane were poured into the tray. Is a sheet having a thickness of about 5 mm. Next, the PP container was covered with a PET lid previously treated with a static eliminator, allowed to stand, and cured at 80 ° C. for 2 hours. No gel was observed on the PET lid. A silicone sheet of the desired weight was obtained with a high yield.

Example 4 59.31 g of a mixture of methylvinylpolysiloxane, silicone resin and platinum catalyst (KE1300T), 17.79 g of dimethylpolysiloxane (RTV diluent), and 0.04 g of a mixture of alkynol and toluene (X-93-500) And a mixture of methyl hydrogen polysiloxane, dimethyl polysiloxane and 1-ethylcyclohexane (X-32-166)
4) 8.90 g was weighed into a beaker, stirred and mixed, and 3.18 g of the mixture was 10 mm deep and the angle between the base and the wall was 1.
After spreading in a tray made of PP at a temperature of 33.5 degrees and allowing it to stand, a methylvinylpolysiloxane-platinum catalyst mixture (KE
1051A) and a mixture of methyl vinyl polysiloxane and methyl hydrogen polysiloxane (KE1051B) 360 each
g of the mixture, 28.0 g of the mixture was further added to the tray, covered with a stainless steel plate and allowed to stand.
After curing in a thermostat for a long time, the desired silicone sheet was obtained at a high yield.

Comparative Example 1 Dimethylpolysiloxane was added to 2.96 g of a mixture of methylvinylpolysiloxane, silicone resin, and platinum catalyst.
59 g is added and mixed well, and 0.45 g of a mixture of methyl hydrogen polysiloxane, dimethyl polysiloxane and 1-ethylcyclohexane is added and mixed.
This was spread in a PP tray having a depth of 10 mm and an angle between the bottom and the wall of about 105 degrees, and 13.00 g of a methylvinylpolysiloxane / platinum catalyst mixture and methylvinylpolysiloxane / methylhydrogen were added. A mixture of 13.00 g of the polysiloxane admixture was poured into a sheet having a thickness of about 5 mm as a whole. Then this P
The P container was covered with a PET lid, allowed to stand, and then cured at 80 ° C. for 2 hours to obtain a silicone sheet. However, in some of the sheets produced, the silicone gel adhered and hardened to the lid and did not have the desired sheet weight, and was unsuitable as a product.

[0024]

As described above, according to the present invention, the effect of static electricity generated during the production of a silicone sheet in an insulating container is effectively suppressed, and a silicone sheet having a predetermined shape and weight is stably produced at a high yield. be able to. The surgical bandage produced by this method is an easy-to-handle silicone sheet having excellent adhesion, protection and followability to the affected area, and excellent physical strength.

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Claims (7)

[Claims] 1. A silicone sheet, characterized in that predetermined amounts of silicone for forming a silicone elastomer and silicone for forming a silicone gel are sequentially filled in a polypropylene container, and then the container is heated and cured after removing static electricity from the container. Production method. 2. A material made of plastic in which predetermined amounts of silicone for forming a silicone elastomer and silicone for forming a silicone gel are sequentially filled in a polypropylene container, and the container is coated with a conductive metal or a conductive metal or a conductive organic substance. A method for producing a silicone sheet, comprising heating and curing after covering with a lid. 3. The method for producing a silicone sheet according to claim 2, wherein the lid is made of a conductive metal selected from silver, copper, iron, brass, bronze or stainless steel. 4. The method for producing a silicone sheet according to claim 2, wherein said lid is made of a plastic material coated with a conductive metal or a conductive organic substance. 5. A material made of plastic in which predetermined amounts of silicone for forming a silicone elastomer and silicone for forming a silicone gel are sequentially filled in a polypropylene container, and the container is coated with a conductive metal or a conductive metal or a conductive organic substance. A method for producing a silicone sheet, comprising: completely removing static electricity by covering with a lid, and then heating and curing. 6. A silicone container for use in a heating / curing reaction of silicone, wherein the lid of the container is made of a conductive metal or a plastic coated with a conductive metal or a conductive organic substance. Container for sheet production. 7. A polypropylene container used for a heating / curing reaction of silicone, wherein the container has a bottom surface and 95-1.
A silicone sheet manufacturing container having a peripheral wall having an angle of 20 degrees.