Some standard content:
Professional Standard of the People's Republic of China
ZB G 80004-88
Complete as: HG 355-1p88
Method for determination of the sublayeradhesion ability of photographic film base
Promulgated on 1988-11-30
Promulgated by the Ministry of Chemical Industry of the People's Republic of China and implemented on 1989-05-01
Professional Standard of the People's Republic of China
Method for determination of the sublayeradhesionabtlityofphotographicflmbase1Subject content and scope of application
ZBG 80004-88
HG/T 3559-/988
This standard specifies the instruments, equipment, determination conditions, determination methods and test report contents for determination of sublayer adhesion of photographic film base. This standard is mainly applicable to the determination of the adhesion of the base layer of various silver salt photosensitive films; it is also applicable to the determination of the adhesion of the base layer of the support of photographic paper and ten-plate. The adhesion of the coating (emulsion layer or gelatin layer) of various finished films, photographic papers, and dry plates can also be determined by referring to this standard method.
2 Reference standards
GB2771 Medical rubber
3 Definition
3.1 Base layer
The photosensitive emulsion of silver salt photosensitive film is coated on its support-cellulose triacetate film base or polyester film base, paper base, glass plate. In order to make the photosensitive emulsion adhere firmly to the film base, a bonding layer with bidirectional adhesion is coated on the base below the photosensitive emulsion layer and above the film base. This bonding layer is called the base layer. 3.2 Base layer adhesion
Includes the bonding strength between the photosensitive emulsion layer and the base layer, and between the base layer and the film base. The adhesion strength of the film base layer of the film coated with photosensitive emulsion before being treated with processing liquid or after being washed with liquid and dried is called the base layer fastness in the dry state; on the contrary, the adhesion strength of the film base layer of the test piece after being treated with processing liquid and in the wet state is called the base layer wet fastness. The two are collectively called the base layer adhesion strength. 4 Method Summary
4.1 Determination of base layer fastness
On the emulsion layer of the unprocessed or washed dry film, use a blade to cut into 5mm×5mm small squares, and use an adhesive tape that meets the requirements of 5.4 to stick on the small squares of the emulsion layer of the test piece. Pull the adhesive tape off the test piece at an angle of about 180° for about 1s, and evaluate the base layer dryness of the test piece according to the number of grids from which the emulsion layer is peeled off. 4.2 Determination of wet fastness of film base layer
On the emulsion layer of the processed test piece, lines with a spacing of 5 mm are cut. A probe with a gauge weight applied and wrapped with polyurethane foam plastic meeting the requirements of 5.5 is used to rub the damp emulsion surface vertically. The wet fastness of the film base layer of the test piece is evaluated by the maximum width of the emulsion layer rubbed off. 5 Materials and Equipment
5.1 Photosensitive emulsion
Take an emulsion that is effective for the purpose of the film base sample (including the corresponding protective film solution). The method of applying emulsion in the laboratory is shown in Appendix B (reference).
Approved by the Ministry of Chemical Industry of the People's Republic of China on November 30, 1988 and implemented on May 1, 1989
5.2 Developer
Developer consistent with the photosensitivity test of the film. 5.3 Fixing solution
D1 (rat-).
ZB G 80004-88
5.4 Adhesive tape
Use a tape with a width of 2.5cm, and the quality specifications should comply with GB2771. Before use, the peel strength should be checked according to the method specified in Appendix A (Supplement), which should not be less than 4N/cm. 5.5 Polyurethane foam plastic (SG252-82) thickness 5mm, -grade product
5.6 Hard rubber ball
Model 85-, outer diameter: Φ22 inner diameter ±10; plug hole diameter ±6. Wet fastness test device
Self-made, see Figure 1. The total force of the measuring head of the measuring device is 15N, and the single stroke of the measuring head is 180mm. 00o
Figure 1 Wet fastness test device
1-Low seat; 2-Wipe table, 3-One sample; 1-Fixed sample clip, 6-Load plate, 6- —Transmission arm; 7—Guide rail; 8—Support seat, 9—Hand crank: 10—Erase head 6 Preparation for measurement
B.1 Sampling
From the sample coated with emulsion and baked, cut 15 test pieces of 30cm×3.5cm for measurement, of which 5 are used for the measurement before processing, 5 are used for the measurement of fastness after processing, and the other 5 are used for the measurement of wet strength. The test pieces for measurement should be free of defects such as bubbles, streaks, wire drawing, sand holes, scratches, etc.
6.2 Measurement conditions
Measurement Ambient temperature 23+5℃, relative humidity 50%~70%. Sampling and measurement should be completed in one go. 7 Measurement steps
7.1 Ten fastness measurement
7.1.1 At the part of the emulsion layer of the test piece for measuring the F fastness before addition 1.1 and the lower fastness after addition T, use a single-sided blade to scratch (it is required to scratch through the emulsion layer, but not through the film base) 20 small grids of 5m㎡×5mm along the length and width of the test piece. The shape of the scratched grid position is shown in Figure 2a.
ZBG8000 4—88
7.1.2 Place the test piece with the grid engraved on a flat surface, and stick one end of the rubber arm specified in 5.4 on the grid part of the adhesive layer of the test piece, with a sticking length of 15 cm. The other end of the rubber arm (about 8 cm) is not stuck. Use a single-sided knife to press the adhesive plaster sticking part 3 to 5 times to ensure good contact, then hold the end of the rubber that is not stuck to the emulsion layer, and pull it evenly from the test piece at an angle of about 180 degrees for about 1 second, and count the number of grids of the emulsion layer peeled off by the rubber arm. In the small grid of the grid, if there is any emulsion engraved on it, the small grid is counted as the number of grids where the emulsion is stuck off.
7.2 Wet fastness test
7.2.1 Take the sample to be tested and process it according to the processing technology of the film. After the last processing step (without drying) is completed, use a stylus (used for writing wax paper) to scratch 5mm lines on the surface of the wet emulsion layer according to the full width. See Figure 2b for 37 lines. 5:
7.2.2 Place the wet sample after conditioning on the stainless steel table of the measuring device, clamp the two ends of the sample with a torch, and then place the rubber pad wrapped with wet polyurethane foam plastic on the part of the sample with lines. Turn the test head to rub the wet emulsion surface 1 back and forth 3 times. The maximum width of the emulsion layer rubbed off is used to evaluate the film base layer's resistance. 8 Test results
8.1 Film base layer resistance result expression
The film base layer resistance is expressed by the number of emulsion layers peeled off by the adhesive tape. Take the maximum width of five test pieces. Maximum value, and certify according to the provisions of Table 1,
Number of emulsion stripped off (pieces)
Dryness evaluation (grade)
8.2 Wet fastness of base layer of film
The wet fastness of base layer of film is expressed by the maximum width of the emulsion layer rubbed, take the maximum value among five test pieces, and evaluate according to the provisions of Table 2. Test report
Width of emulsion stripped off (mm)
The test report should include the following contents:
Sample name, axis number, manufacturer,
Testing device:bzxZ.net
ZE G 80004-88
Sample preparation: sample, sample size, sample quantity. Test conditions: temperature, humidity
Test date:
All the data obtained shall be explained.
Wet fastness evaluation (grade)
ZBG80004-88
Appendix A
Determination of peel strength of medical adhesive plaster
(Supplement)
The peel strength shall be determined by a tensile machine commonly used in papermaking and plastics. Its measuring range shall not exceed 5kg. The measuring environment shall be in accordance with 6.2. The operation steps are as follows:
A1 Take a PVC plastic plate of 180mm×20mm×2mm. A2 Take a film sample of 180mm×20mm coated with photosensitive emulsion, align the film sample with the PVC plastic plate, with the film emulsion facing outward, and fix its end with adhesive tape (the adhesive length shall not exceed 20mm). A3 Take an adhesive tape with a width of 12-13mm and a length of 380mm, and stick the end of the rubber, about 12mm long, to the middle of the film sample.
A4 Use the back of a single-sided blade to press the adhesive rubber palace in one direction 3 times to ensure that the adhesive tape is in close contact with the surface of the emulsion layer. A5 Use 1 of the tensile machine:The chuck clamps the plastic plate that fixes the film at the end together with the film, and the adhesive tape is bent 180" from the mountain end and fixed with the lower fire head. The upper and lower chucks are 200mm apart. Start the tensile testing machine and make the lower fire head descend evenly at a speed of 500mm/min. The adhesive tape is pulled down from the film sample at an angle of 180^ and peeled off from the film. Read the maximum tensile force value on the ruler. A6 Measure five samples in parallel and take the arithmetic average value. Appendix B
Laboratory preparation method of film samples for direct determination of film base layer adhesion
(reference)
B1 Instrument setting Preparation
B1.1 Ring coater
The structure of the film ring coater recommended by this standard for coating emulsion is shown in Schematic B1. B1.2 Electric heating air blast dryer
ZBG80004-
Figure B1 Schematic diagram of film ring coater
! 1—film substrate to be coated, 2—guide, 3—emulsion coating tank; 4—frame 6—drive wheel, 6—machine
Control temperature: 30～35℃. The vertical height of the oven cavity should be not less than 50cm. B2 Coating emulsion on the bottom layer of the film substrate sample
88g/se
+0008 9az
B2.1 The emulsion used for inspection should be the finished emulsion with additives added for film production. Put the emulsion into a beaker with a capacity of 500mL, heat it to melt, and keep it at 40℃ for standby use. At the same time, dissolve the protective film solution and set it aside. B2.2 Cut two 140mm full-width film bases from the film base sample and stick them to the film ring with tape. Hang the film base layer of the film ring facing outward on the two guide shafts of the film ring coater and start the machine. After the film ring runs smoothly, pour the dissolved emulsion into the coating tank, and make the emulsion in the tank contact with the film base for coating. After the coating is completed, put down the coating tank and let the film ring coated with emulsion continue to run for 10 to 2 0min. After the emulsion layer solidifies, the protective film can be applied according to the above emulsion coating method, and continue to run for about 10min. B3 Drying of the emulsion layer of the sample
Remove the sample coated with emulsion and protective film from the ring coater, put it into the electric heating blast drying box, hang it with a clamp, and control the temperature to 30~35℃. Dry it under blowing conditions for no less than 30min. After drying, the thickness of the emulsion layer should be 4~10μm. Additional notes:
This standard was drafted and coordinated by the Film Factory of the Ministry of Chemical Industry. Copyright reserved. No reproduction is allowed
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