JPH0355212A - Curing apparatus for photopolymerized resin - Google Patents

Abstract

PURPOSE:To prevent the occurrence of sagging of a polymer, and improve the dimensional accuracy by providing light sources and means for changing the light strength of irradiation lights in time lapse in an irradiation light producing device. CONSTITUTION:A bank of halogen lamps 1 are provided in the form of enclosing from the upside a turn table 2 wherein matters to be irradiated are mounted thereon. There are provided a lamp output variable transformer 3 for changing voltage which is applied to the halogen lamps 1 and voltage switching dial 4, and after the halogen lamps are turned on by putting on an electric switch 5, light strength for irradiating matters to be irradiated can be changed by changing the voltage switching dial 4. Whereby the polymerization speed of photo-polymerization type resin can be controlled, as a result, decreasing of internal distortion or cracks to curing matters can be done, and sagging (deformation) caused by temperature rise can also be prevented, furthermore, the dimensional accuracy of polymer is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is a photopolymerizable type resin which is hardened by irradiation with irradiation light, for example, visible light, and which is used for hardening. The present invention relates to a curing device.

(Prior art) In recent years, the use of synthetic resins has spread to all industrial fields, and methods for curing resins (resin polymerization methods) have been developed.
Various methods such as injection molding, extrusion molding, vacuum molding, and blowing molding are used.

Recently, due to exposure to ultraviolet rays and visible light,
With the advent of photopolymerizable resins that harden, a method of obtaining a polymerized cured product by irradiating photopolymerizable resins with light is becoming popular. In particular, it is being adopted for dental parts, embedding parts, etc. Light sources for the light irradiation means include ultraviolet lamps, fluorescent lamps, halogen lamps, xenon lamps, etc. For example, Japanese Patent Application Laid-Open No. 62-38149 discloses a curing device having a fluorescent lamp that generates visible light of 400 to 500 nm. However, for example, Japanese Patent Application Laid-Open No. 62-47354 discloses a curing device that irradiates light from a halogen lamp onto an object placed on a rotating turntable, and uses a photopolymerizable resin. It is excellent in that dental parts can be hardened in a short period of time.

(Problems to be Solved by the Invention) However, since the light intensity of the irradiated light is fixed in conventional photopolymerizable resin curing devices, there are the following problems: (1) Fluorescence A curing device that uses a lamp as the light source of the irradiation light generating device does not cause a small temperature rise of the photopolymerizable I/Jin during light irradiation, but the light intensity is low and deep curing properties are poor, so it is difficult to cure thick coatings. When used to cure irradiated materials, it takes time for polymerization and curing, and the strength and water resistance of the polymer are insufficient. (2) Curing devices that use halogen lamps or xenon lamps as the light source of the irradiation light generating device have strong light intensity and can polymerize and harden the photopolymerizable resin deep within a short time, but the polymerization may be rapid. Temperature rise is significant. As a result, cracks occur in the polymer due to polymerization strain, the dimensional accuracy of the polymer decreases due to local thermal expansion, or sag occurs in the polymer, such as dental materials made of photopolymerizable resin. The mold resin may become less fluid.

(Means for Solving the Problems) The present invention provides means for solving the problems of the conventional method, namely (1) a photopolymerizable resin curing device having an irradiation light emitting device and a light irradiation stage; The photopolymerizable resin curing device is characterized in that the irradiation light generating device is equipped with a light source and means for changing the light intensity of the irradiation light over time.

Here, "changing the light intensity of irradiation light" means changing the light intensity stepwise or continuously (steplessly). In the above, it is preferable that the irradiation light be visible light and that a halogen lamp or a xenon lamp be used as the light source of the irradiation light generation device. Furthermore, as a means for changing the light intensity of the irradiated light over time, it is also preferable to adopt a method of changing over time the electric power supplied to the halogen lamp or the xenon lamp.

Furthermore, as a means of changing the light intensity of the irradiation light,
It is also preferable to change the number of halogen lamps or xenon lamps turned on in multiple stages over time. It is also preferable to provide two or more different types of lamps as light sources, such as a fluorescent lamp, a halogen lamp, and a xenon lamp, and to switch the types of these lamps over time.

By using the apparatus of the present invention, it is possible, for example, to irradiate with weak light at the initial stage of polymerization and then to irradiate with strong light, or to irradiate with light in the reverse order.

Therefore, for example, when a light-transmitting mold is filled with a photopolymerizable resin and then installed in the curing device of the present invention and irradiated with light, depending on the occurrence of polymerization distortion etc. in the light-heavy mold, By varying and adjusting the light intensity of the irradiated light, it is possible to produce a polymerized product with less polymerization strain and the like as a whole.

Furthermore, for example, polymerization of photopolymerizable resins having shapeability such as those used in dental techniques can be suitably carried out.

That is, after forming the photopolymerizable resin into a desired shape, the molded article is placed in the curing device of the present invention, and then when light irradiation is performed, the light intensity is relatively weak at the beginning of the light irradiation. Light irradiation is performed to harden the surface, and then light irradiation is performed with the light intensity of the irradiation light sufficiently increased. By carrying out such a method, polymerization and curing can be carried out without damaging the initial shape.

The light intensity of the irradiation light may be changed manually using a switch, dial, etc., or may be changed automatically after a predetermined time has elapsed using a timer.

Furthermore, a method of automatically controlling the light intensity according to a preset change pattern of light intensity using a sequencer, a programmable controller, etc. can also be applied. Voltage adjustment using a slider or the like can be used as a method for changing the light intensity, and if the light source is a halogen lamp, for example, it is suitable because the power supplied to the halogen lamp can be changed continuously as desired. is,
This can also be easily achieved by controlling the number of lamps to be lit.

Furthermore, when lighting two or more different types of lamps, the types of lamps to be lit can be switched using a switch or timer. For example, at the beginning of light irradiation, a fluorescent lamp is turned on, and then a halogen lamp or a xenon lamp is turned on.

Examples of photopolymerizable resins include compositions in which a small amount of a photopolymerization initiator is added to a single compound or a mixture of a plurality of compounds having at least one carbon-carbon unsaturated double bond in the molecule. Furthermore, a photosensitizer and a reducing agent such as a tertiary amine can be used if necessary.

Further, it is possible to use a composition filled with an inorganic or organic filler, an antioxidant, an antistatic agent, a coloring agent, a thermal polymerization inhibitor, etc. added thereto.

Examples of compounds having at least one carbon-carbon unsaturated double bond in the molecule include methyl (meth)acrylate;
Monofunctionals such as ethyl (meth)acrylate, proyl (meth)acrylate, cyclohexyl (meth)acrylate, benzyl (meth)acrylate, (meth)acrylic acid, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate 1-1, etc. (meth)acrylic acid derivatives, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, bisphenol A di(meth)acrylate, bisphenol A
Ethylene glycol-modified di(meth)acrylate, bisphenol A propylene glycol-modified di(meth)acrylate, bisphenol A glycerol-modified di(meth)acrylate, trimethylolpropane tri(meth)
Examples include polyfunctional (meth)acrylates such as acrylates. Light heavy initiators include camphorquinone, benzyl,
Dicarbonyl derivatives such as anthraquinone and α-naphthyl; thioxanthone derivatives such as 2-chlorothioxanthone, 2-methylthioxanthone, and 2,4,-dimethylthioxanthone; examples of inorganic or organic fillers include glass beads, fine silica powder, Examples include fine titanium oxide powder, glass fiber, whiskers, carbon fiber, and powders of various polymers.

Typical examples of these compositions and photopolymerizable resins include dental composite resins.

(Example) Next, examples of the present invention will be described.

Embodiment 1; FIG. 1 is a partially cutaway structural diagram of a first embodiment of the present invention, and its electrical circuit diagram is as shown in FIG. 4.

In the apparatus of this example, five eight-roten lamps 1 are provided so as to surround from above a turntable 2 on which an object to be irradiated is placed.

It is equipped with a variable lamp output transformer 3 and a voltage switching dial 4 for changing the voltage applied to the halogen lamp.After turning on the power switch 5 and lighting the halogen lamp 1, the voltage switching dial 4 is switched. This makes it possible to change the intensity of the light that irradiates the object.

Further, this curing device is provided with a cooling fan 6 for suppressing the temperature rise of the illuminated property during light irradiation.

The turntable 2 has a turntable rotation speed variable dial 7, and by sliding this dial, the object to be irradiated can be rotated by selecting an appropriate rotation speed within the range of 3 to 6 Qrpm during light irradiation. , variations in light irradiation intensity can be reduced.

Next, a method of curing a photopolymerizable resin using the curing apparatus of the present invention will be explained.

First, a crown (denture)-shaped object to be irradiated was prepared using New Metacolor (manufactured by Sun Medical Co., Ltd.) as a photopolymerizable resin for manufacturing hard dental resins, and placed on the turntable 2 in the hard resin equipment. I placed it.

Then, with the voltage switching dial 4 set at 20V, the power switch 5 was turned on, and the halogen lamp 1 was turned on and held for 90 seconds.

Next, the voltage switching dial 4 was switched to the 75V position and light was irradiated for 120 seconds, and then the power switch 5 was turned off.

The crown-shaped hard resin cured product obtained in this way does not lose its shape formed at the beginning of the work.
It was fully cured as a whole.

Embodiment 2; FIG. 2 shows a partially broken view of the second embodiment of the present invention. l?
This is a structural diagram, and its electrical circuit diagram is as shown in FIG.

In this example device, a halogen lamp 10 and a fluorescent lamp 11 are provided above the turntable 12, and the lighting state B of the fluorescent lamp (halogen lamp The halogen lamp is turned off) and the halogen lamp is turned on (the fluorescent lamp is turned off).

First, a light-weight resin consisting of 90 parts by weight of methyl methacrylate, 10 parts by weight of triethylene glycol dimethacrylate, 0.1 part by weight of camphorquinone, and 0.1 part by weight of benzoyl peroxide was prepared, and after thorough stirring,
A predetermined amount of the solution was filled into a translucent mold for contact lens molding made of poly-4-methyl-1-pentene, and placed on the turntable 22 of the curing apparatus.

Then, set the halogen lamp/fluorescent lamp switching timer to 15
minutes, the power switch 14 was turned on, and light irradiation using the fluorescent lamp 11 was started.

After about 15 minutes, the timer 13 turns on the fluorescent light 1.
1 went out, the halogen lamp 10 turned on, and the intensity of the light increased. The halogen lamp 10 was turned on, and after 20 minutes, the power switch 14 was turned off to complete curing. The light-transmitting mold was taken out of the apparatus from the turntable 2, and the mold was opened to obtain a photocured contact lens-like mold.

The thus obtained contact lens-like shaped article had no optical distortion, and the radius of curvature accurately mirrored the radius of curvature of the mold.

Embodiment 3: FIG. 3 shows a partially cutaway horizontal view of a third embodiment of the present invention, and FIG. 6 shows its electrical circuit diagram.

In this example apparatus, a 250 W halogen lamp 20 with a large output and a 100 W halogen lamp 21 with a relatively low output are provided above the turntable 22 on which the irradiated human being is placed.

In this curing device, as soon as the power switch 25 is turned on, the high-output halogen lamp 20 is turned on, and when the lamp switching time setting timer 1 (23) times up, the halogen lamp 20 is turned off, and the low-output halogen lamp 20 is turned off. The lamp 21 lights up.

This curing device also has a timer 2 (2) for setting the lamp switching time.
4) is timed out, the small output halogen lamp 21 goes out, and the high output halogen lamp 2 turns on again.
0 lights up. Note that when irradiation is to be terminated, the power switch 25 may be turned off.

Next, a method of curing a photopolymerizable resin using a hardening device will be explained.

First, photopolymerizable resin is used to create dental denture bases;
"Evolex DJ (trade name, manufactured by Nippon Oil & Fats Co., Ltd.) was pressed onto the plaster model and placed on the turntable 22.

Next, timer 1 (23) for setting lamp switching time is set to 2 minutes, and timer 2 (24) for setting lamp switching time is set to 1 minute.
After setting the time to 0 minutes, the power switch 25 was turned on and the high output halogen lamp 20 was turned on for the first time.

After 2 minutes have elapsed, the high output halogen lamp 20 is turned off and the low output halogen lamp 21 is turned on by the action of the lamp switching time setting timer 1 (23), and after another 10 minutes, the lamp switching time setting timer 2 (24) is turned off. >, the high output halogen lamp 20 was turned on again and the low output halogen lamp 21 was turned off.

After 5 minutes had passed, the power switch 25 was turned off to complete curing.

The denture base thus obtained had a good 311 fit with the model, and the effects of deformation due to polymerization shrinkage and thermal expansion were extremely small.

Comparative Example 1: In the curing apparatus used in Example 1, the voltage switching tile 4 was set to 75V, and the crown irradiation object was exposed to 180V in the same manner as in Example 1 without changing the light intensity.
Light irradiation was performed for seconds.

The thus obtained cured product required {l, since graying due to resin flow was observed on the surface layer.

Comparative Example 2: Using the curing device used in Example 2, 10 halogen lamps were
A contact lens-shaped molded product was cured in the same manner as in Example 2 by lighting only the fluorescent lamp 11 for 60 minutes without turning on the lamp. Although the thus obtained contact lens-like article had no optical distortion, it had poor strength and was easily deformed and destroyed, making it impossible to use it for practical purposes.

In addition, using the curing device used in Example 2, only the halogen lamp 10 was heated at 30°C without turning on the fluorescent lamp 11.
The light was turned on for a minute, and a contact lens-shaped molded product was hardened in the same manner as in Example 2.

The contact lenses thus obtained had the desired mechanical strength, but some optical distortion was observed and crack-like defects occurred on a part of the lens surface, making it difficult to put into practical use. It was impossible to use it.

(Effects of the Invention) As described above, according to the present invention, the following advantages and effects can be obtained.

(1) Since the polymerization rate of photopolymerizable resin can be controlled by changing the light intensity during light irradiation,
It can drastically reduce internal strain and cracks in the cured product. (2) It is possible to prevent sagging (deformation) of photopolymerizable resins with shapeability, such as those used in dental techniques, due to temperature rises associated with increases in light intensity.

(3) Since the light intensity can be changed and the temperature rise during light irradiation can be effectively controlled, the dimensional accuracy of heavy objects is significantly improved.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a partially cutaway 1lrfl construction drawing of the device of the first embodiment of the present invention, Fig. 2 is a partially cutaway structural view of the device of the second embodiment, and Fig. 3 is the 4 shows an electric circuit diagram of the embodiment device shown in FIG. 1, FIG. 5 shows an electric circuit diagram of the embodiment device shown in FIG. 2, and FIG. 6 shows a partially cutaway side view of the embodiment device. Electric circuit diagrams of the embodiment devices are shown. Turntable halogen lamp. 2 Dial for changing the transformer voltage for variable lamp output. 5 Cooling fan turntable variable dial 9; turntable electric circuit power switch 13: l4: 16; 17: l8: 19: 20: 21 22 Halogen lamp/fluorescent lamp/timer power switch for switching ，
15: Cooling fan Turntable variable dial, Turntable variable transformer, Speed variable motor, Power relay for lamp switching Halogen lamp (250W for high output) Halogen lamp (100W for small output) Turntable 23・ 24: 25: 27; 28: 29 30 Timer 1 for setting lamp switching time, Timer 2 for setting lamp switching time, Power switch. 26; Cooling fan Dial for variable turntable Transformer for variable turntable Speed variable motor Power relay for lamp switching

Claims (6)

[Claims] (1) A photopolymerizable resin curing device having an irradiation light generation device and a light irradiation stage, characterized in that the irradiation light generation device is equipped with a light source and means for changing the light intensity of the irradiation light over time. A photopolymerizable resin curing device. (2) Claim 1 characterized in that the irradiation light is visible light.
A curing device for the photopolymerizable resin described above. (3) Claim 1 or 2, wherein the irradiation light generating device is equipped with a halogen lamp or a xenon lamp as a light source, and a means for changing the electric power supplied to the halogen lamp or the xenon lamp over time. 2. The photopolymerizable resin curing device according to 2. (4) Claim 1 characterized in that the irradiation light generating device is equipped with a plurality of halogen lamps or xenon lamps as light sources, and means for changing the number of lamps to be turned on in multiple stages as time passes. Or the photopolymerizable resin curing device according to 2. (5) Any one of claims 1 to 4, characterized in that the irradiation light generating device is equipped with two or more different types of lamps as light sources, and is equipped with means for switching the type of lamp to be lit as time passes. The photopolymerizable resin curing device described in . (6) The photopolymerizable resin curing device according to claim 5, wherein the two or more different types of lamps are selected from fluorescent lamps, halogen lamps, and xenon lamps.