Film coating liquid and preparation method thereof

Abstract

The invention discloses film coating liquid and a preparation method thereof, and belongs to the technical field of coating liquid. The coating is prepared from the following raw materials in parts by weight: 1-4 parts of polythiophene, 2-6 parts of polyaniline, 0.5-3 parts of a surfactant, 0.1-1 part of an adhesive, 0.2-1.5 parts of a cross-linking agent and 25-45 parts of a solvent. The silver halide photosensitive medical film produced by using the coating liquid disclosed by the invention has relatively strong adhesive force, is not easy to demould and good in flexibility, and meanwhile, the silver halide photosensitive medical film produced by using the coating liquid disclosed by the invention is strong in anti-static property and good in stability. The coating liquid containing polythiophene and polyaniline can effectively enhance the anti-static property of the silver halide photosensitive medical film, and the silver halide photosensitive medical film only containing the polythiophene or polyaniline coating liquid is poor in anti-static property.

Description

Technical Field

[0001] The invention belongs to the technical field of coating liquids, and in particular relates to a film coating liquid and a preparation method thereof. Background Art

[0002] Medical films are divided into medical wet films and medical dry films. Medical wet films are traditional films, mainly silver halide photosensitive medical films. This type of medical film is easily affected by external environmental factors and is difficult to preserve. In addition, it also needs to be processed with developer and fixer during use. Medical dry film is a medical film processed by thermal, laser, and inkjet printing. This film can be processed without developer and fixer. Due to the simple imaging of medical dry film, it is currently the main medical imaging recording material. However, some customers still use medical wet film, and silver halide photosensitive medical film still occupies a certain market.

[0003] The substrate of silver halide photosensitive medical film is PET film base, but the conductivity of PET itself is very low, which means that there are few free electrons inside PET, and it is difficult to quickly conduct and disperse the charge. When the PET film base rubs against an object, contacts or separates, it is very easy to generate static electricity, resulting in abnormal exposure of the film. When the film is photo-painted on the image output machine, the static electricity generated by the friction between the medical film and the roller is also easy to affect the laser head of the image output machine, which may cause the laser head of the image output machine to burn, especially in dry seasons. Therefore, an anti-static protective layer is required to protect the silver halide photosensitive medical film.

[0004] The invention of patent publication number CN112239618A discloses a method for preparing and applying a coating liquid. The coating liquid prepared by the method is applied to a film to form a transparent and uniform coating with good anti-adhesion properties. The titanium dioxide is modified by a silane coupling agent to improve the compatibility between inorganic particles and organic particles in the coating liquid, which helps to improve the antistatic properties of the formed coating. However, the coating liquid is targeted at new medical dry non-silver films and cannot be applied to silver halide photosensitive medical films. In view of this, it is necessary to provide a coating liquid applied to silver halide photosensitive medical films and a preparation method thereof. Summary of the invention

[0005] To achieve the above objectives, the present invention adopts the following technical solutions:

[0006] A film coating liquid comprises the following raw materials in parts by weight:

[0007] 1-4 parts of polythiophene, 2-6 parts of polyaniline, 0.5-3 parts of surfactant, 0.1-1 parts of adhesive, 0.2-1.5 parts of cross-linking agent, and 25-45 parts of solvent.

[0008] As a further improvement of the technical solution, the following raw materials are included by weight:

[0009] 3 parts of polythiophene, 4 parts of polyaniline, 2 parts of surfactant, 0.6 parts of binder, 1 part of cross-linking agent, and 35 parts of solvent.

[0010] As a further improvement of the technical solution, the surfactant includes one or more of alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, and alkyl alcohol amide.

[0011] As a further improvement of the technical solution, the adhesive includes polyvinyl alcohol or polyacrylamide.

[0012] As a further improvement of the technical solution, the cross-linking agent includes one or more of polyisocyanate, aziridine, polycarbodiimide, and isocyanate.

[0013] As a further improvement of the technical solution, the solvent is one of ethanol, methanol and glycerol.

[0014] The present application also provides a method for preparing a film coating liquid, comprising the following steps:

[0015] Step 1: Weigh polythiophene, polyaniline, surfactant, adhesive, cross-linking agent and solvent according to corresponding weight parts;

[0016] Step 2: adding polythiophene and polyaniline into a solvent and stirring evenly to obtain a solution;

[0017] Step 3: Add the surfactant to the solution in step 2, stirring while adding, and continue stirring after the addition is completed to make the surfactant evenly dispersed;

[0018] Step 4: slowly add the binder and the cross-linking agent to the solution in step 2 in sequence, stirring while adding, and after the addition is completed, continue stirring, and then stand to obtain a mixed solution;

[0019] Step 5: After standing for a period of time, the mixed solution is centrifuged and degassed to obtain a coating solution.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The silver halide photosensitive medical film produced using the coating liquid of the present application has strong adhesion, is not easy to demold, and has good flexibility. At the same time, the silver halide photosensitive medical film produced using the coating liquid of the present application has strong antistatic properties. The coating liquid containing polythiophene and polyaniline can effectively enhance the antistatic properties of the silver halide photosensitive medical film, while the silver halide photosensitive medical film using the coating liquid containing only polythiophene or polyaniline has poor antistatic performance. DETAILED DESCRIPTION

[0022] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples described. The experimental methods for specific adjustments not specified in the following examples are selected according to the product specifications. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs.

[0023] Embodiment 1:

[0024] A film coating liquid comprises the following raw materials in parts by weight:

[0025] Polythiophene 300G, polyaniline 400G, surfactant 200G, binder 60G, cross-linking agent 100G, solvent 3500G.

[0026] Preferably, the surfactant is alkylphenol polyoxyethylene ether.

[0027] Preferably, the adhesive comprises polyvinyl alcohol.

[0028] Preferably, the crosslinking agent comprises a polyisocyanate.

[0029] Preferably, the solvent is ethanol.

[0030] The preparation method of the coating solution comprises the following steps:

[0031] Step 1: Weigh polythiophene, polyaniline, surfactant, adhesive, cross-linking agent and solvent according to corresponding weight parts;

[0032] Step 2: adding the solvent into a stirrer, then starting the stirrer to stir, and adding polythiophene and polyaniline into the stirrer and stirring evenly, the stirring speed of the stirrer is 1500 r / min, and the stirring time is at least 15 minutes to obtain a solution;

[0033] Step 3: Add the surfactant to the solution in step 2, stirring while adding. After the addition is completed, continue stirring at a stirring speed of 1500r / min for at least 30 minutes to ensure that the surfactant is evenly dispersed;

[0034] Step 4: slowly add the binder and the cross-linking agent to the solution in step 2 in sequence, stirring while adding. After the addition is completed, continue stirring at a stirring speed of 1000 r / min for at least 30 minutes, and then let it stand to obtain a mixed solution;

[0035] Step 5: After standing for a period of time, the mixed solution in step 4 is centrifuged for degassing, the centrifugal speed of the centrifuge is 2000r / min, and the centrifugal degassing time is at least 30 minutes to obtain a coating solution.

[0036] The mixed solution in step 2 is placed in a centrifuge for centrifugal degassing at a centrifugal speed of 1600 r / min and a centrifugal degassing time of at least 20 minutes to obtain a coating solution.

[0037] Embodiment 2:

[0038] A film coating liquid comprises the following raw materials in parts by weight:

[0039] Polythiophene 100G, polyaniline 200G, surfactant 50G, binder 10G, cross-linking agent 20G, solvent 2500G.

[0040] Preferably, the surfactant is alkylphenol polyoxyethylene ether.

[0041] Preferably, the adhesive comprises polyvinyl alcohol.

[0042] Preferably, the crosslinking agent comprises a polyisocyanate.

[0043] Preferably, the solvent is ethanol.

[0044] The preparation method of the coating solution comprises the following steps:

[0045] Step 1: Weigh polythiophene, polyaniline, surfactant, adhesive, cross-linking agent and solvent according to corresponding weight parts;

[0046] Step 2: adding the solvent into a stirrer, then starting the stirrer to stir, and adding polythiophene and polyaniline into the stirrer and stirring evenly, the stirring speed of the stirrer is 1500 r / min, and the stirring time is at least 15 minutes to obtain a solution;

[0047] Step 3: Add the surfactant to the solution in step 2, stirring while adding. After the addition is completed, continue stirring at a stirring speed of 1500r / min for at least 30 minutes to ensure that the surfactant is evenly dispersed;

[0048] Step 4: slowly add the binder and the cross-linking agent to the solution in step 2 in sequence, stirring while adding. After the addition is completed, continue stirring at a stirring speed of 1000 r / min for at least 30 minutes, and then let it stand to obtain a mixed solution;

[0049] Step 5: After standing for a period of time, the mixed solution in step 4 is centrifuged for degassing, the centrifugal speed of the centrifuge is 2000r / min, and the centrifugal degassing time is at least 30 minutes to obtain a coating solution.

[0050] The mixed solution in step 2 is placed in a centrifuge for centrifugal degassing at a centrifugal speed of 1600 r / min and a centrifugal degassing time of at least 20 minutes to obtain a coating solution.

[0051] Embodiment 3:

[0052] A film coating liquid comprises the following raw materials in parts by weight:

[0053] Polythiophene 400G, polyaniline 600G, surfactant 300G, binder 100G, cross-linking agent 150G, solvent 4500G.

[0054] Preferably, the surfactant is alkylphenol polyoxyethylene ether.

[0055] Preferably, the adhesive comprises polyvinyl alcohol.

[0056] Preferably, the crosslinking agent comprises a polyisocyanate.

[0057] Preferably, the solvent is ethanol.

[0058] The preparation method of the coating solution comprises the following steps:

[0059] Step 1: Weigh polythiophene, polyaniline, surfactant, adhesive, cross-linking agent and solvent according to corresponding weight parts;

[0060] Step 2: adding the solvent into a stirrer, then starting the stirrer to stir, and adding polythiophene and polyaniline into the stirrer and stirring evenly, the stirring speed of the stirrer is 1500 r / min, and the stirring time is at least 15 minutes to obtain a solution;

[0061] Step 3: Add the surfactant to the solution in step 2, stirring while adding. After the addition is completed, continue stirring at a stirring speed of 1500r / min for at least 30 minutes to ensure that the surfactant is evenly dispersed;

[0062] Step 4: slowly add the binder and the cross-linking agent to the solution in step 2 in sequence, stirring while adding. After the addition is completed, continue stirring at a stirring speed of 1000 r / min for at least 30 minutes, and then let it stand to obtain a mixed solution;

[0063] Step 5: After standing for a period of time, the mixed solution in step 4 is centrifuged for degassing, the centrifugal speed of the centrifuge is 2000r / min, and the centrifugal degassing time is at least 30 minutes to obtain a coating solution.

[0064] The mixed solution in step 2 is placed in a centrifuge for centrifugal degassing at a centrifugal speed of 1600 r / min and a centrifugal degassing time of at least 20 minutes to obtain a coating solution.

[0065] Embodiment 4:

[0066] Compared with Example 1, the difference is that the surfactant is fatty alcohol polyoxyethylene ether.

[0067] Embodiment 5:

[0068] Compared with Example 1, the difference is that the surfactant is alkyl alcohol amide.

[0069] Embodiment 6:

[0070] Compared with Example 1, the difference is that the adhesive is polyacrylamide.

[0071] Embodiment 7:

[0072] Compared with Example 1, the difference is that the cross-linking agent is aziridine.

[0073] Embodiment 8:

[0074] Compared with Example 1, the difference is that the cross-linking agent is polycarbodiimide.

[0075] Embodiment 9:

[0076] Compared with Example 1, the difference is that the cross-linking agent is isocyanate.

[0077] Embodiment 10:

[0078] Compared with Example 1, the difference is that the solvent is methanol.

[0079] Embodiment 11:

[0080] Compared with Example 1, the difference is that the solvent is glycerol.

[0081] Comparative Example 1:

[0082] A film coating liquid comprises the following raw materials in parts by weight:

[0083] Polythiophene 300G, surfactant 200G, binder 60G, cross-linking agent 100G, solvent 3500G.

[0084] Preferably, the surfactant is alkylphenol polyoxyethylene ether.

[0085] Preferably, the adhesive comprises polyvinyl alcohol.

[0086] Preferably, the crosslinking agent comprises a polyisocyanate.

[0087] Preferably, the solvent is ethanol.

[0088] The preparation method of the coating solution comprises the following steps:

[0089] Step 1: Weigh polythiophene, polyaniline, surfactant, adhesive, cross-linking agent and solvent according to corresponding weight parts;

[0090] Step 2: adding the solvent into a stirrer, then starting the stirrer to stir, and adding polythiophene and polyaniline into the stirrer and stirring evenly, the stirring speed of the stirrer is 1500 r / min, and the stirring time is at least 15 minutes to obtain a solution;

[0091] Step 3: Add the surfactant to the solution in step 2, stirring while adding. After the addition is completed, continue stirring at a stirring speed of 1500r / min for at least 30 minutes to ensure that the surfactant is evenly dispersed;

[0092] Step 4: slowly add the binder and the cross-linking agent to the solution in step 2 in sequence, stirring while adding. After the addition is completed, continue stirring at a stirring speed of 1000 r / min for at least 30 minutes, and then let it stand to obtain a mixed solution;

[0093] Step 5: After standing for a period of time, the mixed solution in step 4 is centrifuged for degassing, the centrifugal speed of the centrifuge is 2000r / min, and the centrifugal degassing time is at least 30 minutes to obtain a coating solution.

[0094] The mixed solution in step 2 is placed in a centrifuge for centrifugal degassing at a centrifugal speed of 1600 r / min and a centrifugal degassing time of at least 20 minutes to obtain a coating solution.

[0095] Comparative Example 2:

[0096] A film coating liquid comprises the following raw materials in parts by weight:

[0097] Polyaniline 400G, surfactant 200G, adhesive 60G, cross-linking agent 100G, solvent 3500G.

[0098] Preferably, the surfactant is alkylphenol polyoxyethylene ether.

[0099] Preferably, the adhesive comprises polyvinyl alcohol.

[0100] Preferably, the crosslinking agent comprises a polyisocyanate.

[0101] Preferably, the solvent is ethanol.

[0102] The preparation method of the coating solution comprises the following steps:

[0103] Step 1: Weigh polythiophene, polyaniline, surfactant, adhesive, cross-linking agent and solvent according to corresponding weight parts;

[0104] Step 2: adding the solvent into a stirrer, then starting the stirrer to stir, and adding polythiophene and polyaniline into the stirrer and stirring evenly, the stirring speed of the stirrer is 1500 r / min, and the stirring time is at least 15 minutes to obtain a solution;

[0105] Step 3: Add the surfactant to the solution in step 2, stirring while adding. After the addition is completed, continue stirring at a stirring speed of 1500r / min for at least 30 minutes to ensure that the surfactant is evenly dispersed;

[0106] Step 4: slowly add the binder and the cross-linking agent to the solution in step 2 in sequence, stirring while adding. After the addition is completed, continue stirring at a stirring speed of 1000 r / min for at least 30 minutes, and then let it stand to obtain a mixed solution;

[0107] Step 5: After standing for a period of time, the mixed solution in step 4 is centrifuged for degassing, the centrifugal speed of the centrifuge is 2000r / min, and the centrifugal degassing time is at least 30 minutes to obtain a coating solution.

[0108] The mixed solution in step 2 is placed in a centrifuge for centrifugal degassing at a centrifugal speed of 1600 r / min and a centrifugal degassing time of at least 20 minutes to obtain a coating solution.

[0109] Performance evaluation:

[0110] Cuticle adhesion test: the coating solutions prepared in Examples 1 to 3, Comparative Examples 1 and 2 were applied in the production process of silver halide photosensitive medical films, and the cuticle adhesion test was performed at the same time:

[0111] (A) After the silver halide photosensitive medical film is made, it is rubbed vigorously. If the thermal imaging layer does not fall off and there are no creases, it is 0; if the thermal imaging layer falls off slightly and there are slight creases, it is 1; if the thermal imaging layer falls off over a large area and there are a lot of creases, it is 2.

[0112] (B) In the printing of silver halide photosensitive medical film, if there is no particle shedding, it is 0, and if there is some particle shedding, it is 1.

[0113] Waterproof performance test: the coating liquids prepared in Examples 1 to 3, Comparative Examples 1 and 2 were applied in the production process of silver halide photosensitive medical films, and the waterproof performance test was performed at the same time:

[0114] After the silver halide photosensitive medical film is made, it is placed in an environment of 100 degrees Celsius and 100% humidity for 30 days, and then printed and compared to see if it affects the color development. If there is no effect on the color development quality, the value is 0, and if there is any effect on the color development, the value is 1.

[0115] Anti-scratch performance test: the coating solutions prepared in Examples 1 to 3, Comparative Examples 1 and 2 were applied in the production process of silver halide photosensitive medical films, and the anti-scratch performance test was performed at the same time:

[0116] After the silver halide photosensitive medical film is made, it is placed in an anti-scratch testing machine. The scraper scrapes the surface of the film. If scratches appear on the surface of the film, it is 1, and if there are no obvious scratches, it is 0.

[0117] Antistatic performance and smoothness test: The coating solutions prepared in Examples 1 to 3, Comparative Examples 1 and 2 were applied in the production process of silver halide photosensitive medical films, and antistatic performance and smoothness tests were performed at the same time:

[0118] The surface resistivity meter and Buick smoothness tester (HK-PHD) were used for testing respectively, and the testing was based on GB / T1410-2006.

[0119] Table 1 Test results

[0120]

[0121] The above test results are shown in Table 1. It can be seen from Table 1 that the silver halide photosensitive medical film produced by the coating liquid of the present application has strong adhesion, is not easy to demold, and has good flexibility. At the same time, the silver halide photosensitive medical film produced by the coating liquid of the present application has strong antistatic properties. The coating liquid containing polythiophene and polyaniline can effectively enhance the antistatic properties of the silver halide photosensitive medical film, and the surface resistance is as high as 10 10 The silver halide photosensitive medical film containing only polythiophene or polyaniline coating solution (Comparative Examples 1 and 2) has poor antistatic performance and the surface resistance is only 10 6 Europe.

[0122] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the present invention.

Claims

1. A film coating liquid, characterized in that: The following raw materials are included by weight: 1-4 parts of polythiophene, 2-6 parts of polyaniline, 0.5-3 parts of surfactant, 0.1-1 parts of adhesive, 0.2-1.5 parts of cross-linking agent, and 25-45 parts of solvent.

2. The film coating liquid according to claim 1, characterized in that: The following raw materials are included by weight: 3 parts of polythiophene, 4 parts of polyaniline, 2 parts of surfactant, 0.6 parts of binder, 1 part of cross-linking agent, and 35 parts of solvent.

3. The film coating liquid according to claim 1, characterized in that: The surfactant includes one or more of alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether and alkyl alcohol amide.

4. The film coating liquid according to claim 1, characterized in that: The binder includes polyvinyl alcohol or polyacrylamide.

5. The film coating liquid according to claim 1, characterized in that: The cross-linking agent includes one or more of polyisocyanate, aziridine, polycarbodiimide and isocyanate.

6. The film coating liquid according to claim 1, characterized in that: The solvent is one of ethanol, methanol and glycerol.

7. The method for preparing a film coating liquid according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Weigh polythiophene, polyaniline, surfactant, adhesive, cross-linking agent and solvent according to corresponding weight parts; Step 2: adding polythiophene and polyaniline into a solvent and stirring evenly to obtain a solution; Step 3: Add the surfactant to the solution in step 2, stirring while adding, and continue stirring after the addition is completed to make the surfactant evenly dispersed; Step 4: Add the binder and the cross-linking agent to the solution in step 2 in sequence, stirring while adding, and after the addition is completed, continue stirring, and then stand to obtain a mixed solution; Step 5: After standing for a period of time, the mixed solution is centrifuged and degassed to obtain a coating solution.

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