WO2020093429A1

WO2020093429A1 - Film for dentistry

Info

Publication number: WO2020093429A1
Application number: PCT/CN2018/115594
Authority: WO
Inventors: 袁健
Original assignee: 天津市康华健晔医用材料有限公司; 袁健
Priority date: 2018-11-07
Filing date: 2018-11-15
Publication date: 2020-05-14
Also published as: CN109613797A; CN109613797B

Abstract

A film for dentistry. The composition and weight percentages of raw materials of the film are: 4-8% of an antistatic agent, 5-8% of polyethylene glycol terephthalate, 5-10% of nano silicon oxide, 15-30% of cellulose triacetate, 20-40% of a photosensitive emulsifier, 10-15% of nano aluminum oxide, and 2-5% of polyvinyl alcohol. The film for dentistry is mature in preparation technology, has high stability, high heat resistance, high light transmittance, low haze and high brightness, is non-yellowing, has high adhesive force, good flatness and excellent stiffness, and is resistant to burning and cracking and not prone to damage, and the quality of the film is high.

Description

Dental film

Technical field

The invention belongs to the field of medical imaging, and specifically relates to a dental film.

Background technique

The film is a silver salt film, also called film. Made from PC / PP / PET / PVC materials. Now generally refers to film, but also refers to the negative in the printing plate. Films are black. Films usually have an English symbol at the corners of the film, which is the film number, indicating which of C, M, Y, and K is one of the cmyk (or spot color number) , Indicates the color output of this film. If not, you can see the angle of the net to identify the color. The ladder-like color bar on the side is used to check the dot density. In addition to seeing whether the dot density is normal, the color bar can also see CMYK. The color bar is C in the left corner, the color bar is M in the upper left corner, Y is in the upper right corner, and K is in the lower right corner, so as long as the color bar printing factory You know CMYK. In other words, in order to easily check the density of film development, film corners have color numbers. As for how many colors are printed, it depends on the screen of each film. Films are widely used in many fields. In medical dentistry, films are often used to confirm the gum area, so that it is easy to know the teeth.

The existing film will be interfered by the external environment when it is used, causing damage to the internal structure of the film, which is not conducive to ensuring the stability of the internal structure of the film, and when the film is exposed, the image imaging rate is low, and the image forming effect is not obvious. After the film is formed, it is not convenient for doctors to intuitively view it, which affects the use effect of the film. Therefore, we propose a dental film.

Summary of the invention

The purpose of the present invention is to overcome the defects of the prior art, and a dental film is proposed, which has a mature preparation process, good bead stability, good heat resistance, and is safe and pollution-free.

In order to achieve the above objective, the technical solution of the present invention is as follows:

A dental film, the weight ratio of the film raw material composition is:

Antistatic agent 4% -8%, polyethylene terephthalate 5% -8%, nano silica 5% -10%, cellulose triacetate 15% -30%, photosensitive emulsifier 20% -40 %, Nano alumina 10% -15%, polyvinyl alcohol 2% -5%.

Preferably, the internal components of the photosensitive emulsifier include gelatin, silver salt and potassium bromide, according to their weight percentages: gelatin 30% -50%, silver salt 40% -50%, potassium bromide 10% -20%.

Preferably: the content of acetic acid in cellulose triacetate is 52.33% -55.55%.

Preferably, the antistatic agent contains two or more of sodium alkylsulfonate, alkylsulfonic acid and phosphoric acid.

Preferred: The preparation method is as follows:

S1. Material: Two or more of sodium alkylsulfonate, alkylsulfonic acid and phosphoric acid are mixed and stirred to make antistatic agent, and gelatin, silver salt and potassium bromide are weighed in turn according to their weight percentages. It is mixed and stirred to make a photosensitive emulsifier, and the antistatic agent, polyethylene terephthalate, nano-silica, cellulose triacetate, photosensitive emulsifier, nano-alumina and polyvinyl alcohol are weighed in turn according to their weight percentages ,spare;

S2. Drying: place the antistatic agent, polyethylene terephthalate, nano-silica, cellulose triacetate, photosensitive emulsifier, nano-alumina and polyvinyl alcohol in a drying oven above 120 ℃ Medium drying for 2-4 hours;

S3. Mixing: Add polyethylene terephthalate, cellulose triacetate and polyvinyl alcohol to the reaction kettle, stir and disperse it evenly, and control its heating temperature at 80 ℃ -120 ℃, then use vacuum to remove Bubble, control the speed and stir at 80-120 rpm for 1.5-2 hours, fully stir the materials inside the reactor, add nano-silica and nano-alumina to the reactor, stir at 50-80 rpm for about 1 hour, then Add the photosensitive emulsifier and antistatic agent to the reaction kettle, stir at 50-80 rpm for about 1 hour, filter the bubbles in the reaction kettle, and prepare the rubber compound;

S4: Film release: Cool the mold, add the rubber to the mold, use the hydraulic rod to press down the mold to form, control the hydraulic rod to press the film for about 1 hour, and control the hydraulic flatness of the hydraulic rod;

S5. Demoulding: After heating is completed, the molds at both ends are directly removed and demolded to obtain the film.

Preferably: the height of the hydraulic rod depression is 1-1.5mm.

Preferably: the mold preheating time is 4-6 minutes.

Preferably: the hydraulic rod preheats the depressing part for 1 minute during hydraulic pressure.

Preferably: configure more than 2 sets of molds in the production process, use them alternately, and the mold is aluminum film.

Preferably: The film should be placed in an environment that avoids direct sunlight, the temperature is 20 ° C-23 ° C, and the humidity is 28% -30%.

The technical effects and advantages of the present invention:

1. In the present invention, the gelatin, silver salt and potassium bromide in the photosensitive emulsifier are used to improve the resolution, diffraction efficiency and sensitivity ratio of the film to the laser, increase the light transmittance of the film, and clean the film for easy viewing.

2. The present invention can improve the compactness, smoothness and wear resistance of the film through nano-silica.

3. In the present invention, nano-alumina is a highly dispersed nano-scale aluminum oxide used as a glidant, which has high temperature inertness, high porosity, strong heat resistance, good moldability, and better image forming effect. .

4. The antistatic agent used in the present invention can eliminate the static electricity generated on the surface of the film, prevent the film surface from being affected by external influences on the internal structure, ensure the stability of the internal structure of the film, and extend the service life of the film.

Compared with the prior art, the present invention has the following beneficial effects: Compared with other preparation methods, the preparation technology is mature, good stability, good heat resistance, high light transmittance, low haze, high brightness, and no yellowing , Good adhesion, good flatness, and ultraviolet radiation, good stiffness, anti-cracking, not easy to break, improve film quality.

detailed description

The present invention will be further described in detail below in conjunction with examples.

Example 1:

Antistatic agent 4%, polyethylene terephthalate 5%, nano silica 5%, cellulose triacetate 15%, photosensitive emulsifier 20%, nano alumina 10%, polyvinyl alcohol 2%.

The preparation method is as follows: two or more of sodium alkylsulfonate, alkylsulfonic acid and phosphoric acid are mixed and stirred to make an antistatic agent, and gelatin, silver salt and potassium bromide are weighed in turn according to the weight percentage. It is mixed and stirred to make a photosensitive emulsifier, and the antistatic agent, polyethylene terephthalate, nano-silica, cellulose triacetate, photosensitive emulsifier, nano-alumina and polyvinyl alcohol are weighed in turn according to their weight percentages , Standby; place the antistatic agent, polyethylene terephthalate, nano-silica, cellulose triacetate, photosensitive emulsifier, nano-alumina and polyvinyl alcohol in a drying oven above 120 ℃ for drying Dry for 2-4 hours; add polyethylene terephthalate, cellulose triacetate and polyvinyl alcohol to the reaction kettle, stir and disperse evenly, control the heating temperature at 80 ℃ -120 ℃, use vacuum Remove the bubbles, control the speed and stir at 80-120rpm for 1.5-2 hours, fully stir the materials inside the reactor, add nano-silica and nano-alumina to the reactor, and stir at 50-80rpm for about 1 hour , And then the photosensitive emulsion Add anti-static agent and antistatic agent to the reactor, stir at 50-80 rpm for about 1 hour, filter the bubbles in the reactor to prepare the rubber compound; cool the mold, add the rubber compound to the mold, and use the hydraulic rod to press down the mold For molding, control the hydraulic rod to press the film for about 1 hour, and control the hydraulic flatness of the hydraulic rod; the height of the hydraulic rod to press down is 1-1.5mm, the mold warm-up time is 4-6 minutes, the hydraulic rod is Pre-heat the pressed part for 1 minute; after the heating is completed, directly remove the molds at both ends and demold to obtain the film.

Example 2:

Antistatic agent 8%, polyethylene terephthalate 8%, nano silica 10%, cellulose triacetate 30%, photosensitive emulsifier 40%, nano alumina 15%, polyvinyl alcohol 5%.

Example 3:

Antistatic agent 5%, polyethylene terephthalate 6%, nano silica 7%, cellulose triacetate 19%, photosensitive emulsifier 22%, nano alumina 14%, polyvinyl alcohol 3%.

Example 4:

Antistatic agent 7%, polyethylene terephthalate 7%, nano silica 9%, cellulose triacetate 28%, photosensitive emulsifier 35%, nano alumina 12%, polyvinyl alcohol 4%.

Claims

A dental film, characterized in that the weight percentage composition of the raw material of the film is:

Antistatic agent 4% -8%, polyethylene terephthalate 5% -8%, nano silica 5% -10%, cellulose triacetate 15% -30%, photosensitive emulsifier 20% -40 %, Nano alumina 10% -15%, polyvinyl alcohol 2% -5%.
The dental film according to claim 1, wherein the internal components of the photosensitive emulsifier include gelatin, silver salt and potassium bromide, according to the weight percentage: gelatin 30% -50%, silver salt 40% -50%, potassium bromide 10% -20%.
The dental film according to claim 1, wherein the content of acetic acid in the cellulose triacetate is 52.33% -55.55%.
The dental film according to claim 1, wherein the antistatic agent comprises two or more of sodium alkylsulfonate, alkylsulfonic acid and phosphoric acid.
A preparation method of dental film, characterized in that the preparation method is as follows:

S1. Material: Two or more of sodium alkylsulfonate, alkylsulfonic acid and phosphoric acid are mixed and stirred to make antistatic agent, and gelatin, silver salt and potassium bromide are weighed in turn according to their weight percentages. It is mixed and stirred to make a photosensitive emulsifier, and the antistatic agent, polyethylene terephthalate, nano-silica, cellulose triacetate, photosensitive emulsifier, nano-alumina and polyvinyl alcohol are weighed in turn according to their weight percentages ,spare;

S2. Drying: place the antistatic agent, polyethylene terephthalate, nano-silica, cellulose triacetate, photosensitive emulsifier, nano-alumina and polyvinyl alcohol in a drying oven above 120 ℃ Medium drying for 2-4 hours;

S3. Mixing: Add polyethylene terephthalate, cellulose triacetate and polyvinyl alcohol to the reaction kettle, stir and disperse it evenly, and control its heating temperature at 80 ℃ -120 ℃, then use vacuum to remove Bubble, control the speed and stir at 80-120 rpm for 1.5-2 hours, fully stir the materials inside the reactor, add nano-silica and nano-alumina to the reactor, stir at 50-80 rpm for about 1 hour, then Add the photosensitive emulsifier and antistatic agent to the reaction kettle, stir at 50-80 rpm for about 1 hour, filter the bubbles in the reaction kettle, and prepare the rubber compound;

S4: Film release: Cool the mold, add the rubber to the mold, use the hydraulic rod to press down the mold to form, control the hydraulic rod to press the film for about 1 hour, and control the hydraulic flatness of the hydraulic rod;

S5. Demoulding: After heating is completed, the molds at both ends are directly removed and demolded to obtain the film.
The preparation method of dental film as claimed in claim 5, characterized in that the height of the hydraulic rod pressing down is 1-1.5mm.
The preparation method of dental film according to claim 5, wherein the preheating time of the mold is 4-6 minutes.
The preparation method of dental film as claimed in claim 5, characterized in that the hydraulic rod preheats the depressing part for 1 minute during hydraulic pressure.
The method for preparing a dental film according to claim 5, wherein more than two sets of molds are arranged during the production process, and the molds are aluminum films.
The preparation method of dental film according to claim 5, wherein the film should be placed in an environment avoiding direct sunlight, a temperature of 20 ° C-23 ° C, and a humidity of 28% -30%.