About the detection scheme of plaster adhesion
As a traditional dosage form in traditional Chinese medicine preparations, plaster (sticking agent) plays an important role in the medical field. It has a wide range of applications in the medical fields such as rheumatism, pain relief, elimination, and siltation. Plaster (sticking agent) is extremely easy to use, but the size of its adhesion (adhesive strength) plays an important role for consumers. For this reason, the National Pharmacopoeia tests the adhesion (adhesion) of plasters (stickers). The detailed regulations; the Pharmacopoeia stipulates that the adhesion (adhesion) of the plaster (adhesive) mainly includes three indicators: initial adhesion (initial adhesion), holding strength (stickiness) and peel strength.
Jinan Mingwei Testing Technology Co., Ltd. () is an excellent provider of testing instruments and inspection services. For many years, it has continued to be medical, medical, food, daily chemical, packaging, printing, adhesives, automotive, petrochemical, environmental, biological. , new energy, construction, aviation and electronics customers provide excellent quality control solutions. In order to facilitate the manufacturers of major plasters (stickers) to better understand the "measurement method for adhesion of plasters", the pharmacopoeia regulations are combined with testing instruments to introduce the testing items and test methods.
1. Determination of initial adhesion of plaster (sticker) (initial viscosity measurement)
Take the CNY-1 initial tack tester tested by Jinan Mingwei as an example. The test principle is measured by the inclined ball. The plaster initial adhesion test device is mainly composed of a slanting plate, a base, a stainless steel ball and a ball receiving box. First, adjust the inclined plate of the initial tack tester to 30 degrees from the horizontal plane, fix the adhesive side of the plaster (sticker) sample to the inclined plate of the initial tack tester, and place a stainless steel ball on the inclined plate. The steel ball is placed in the area and adjusted to the initial position, and the steel ball is released. The steel ball is rolled and passed through the viscous surface, and the initial viscosity is evaluated according to the Zui large ball steel ball which can be adhered according to the adhesive surface of the plaster.
Second, the plaster (sticker) holding the viscosity (to determine the adhesion)
Take the CNY-3A viscous tester tested by Jinan Mingwei as an example. The test device consists of a viscous tester (including test rig, test plate, loading plate) and adhesive belt press roller. Adhesive surface (adhesive surface) of the sample is attached to the surface of the test plate and the loading plate, and rolled back and forth three times using an adhesive tape pressing roller. After being placed for 5 minutes, the sample is vertically placed on the test frame along the sample. A weight of a specified mass is suspended in the longitudinal direction, and the time during which the sample slips until it falls off is recorded.
Third, the plaster (paste) peel strength determination
Determined by the 180° peel strength test according to the Pharmacopoeia. Take the DLS-1 electronic peel tester or the electronic tensile tester tested by Jinan Mingwei as an example. The test process is as follows:
1. First, the plaster (sticker) backing was fixed to the test plate with double-sided tape. If necessary, use tape to fix the edges of the upper and lower sides of the sample so that the sample fits flat on the plate. A 2000 g weight roller was used to roll 3 on the prepared sample to ensure that no bubbles were present at the bond. After the test article is pasted, it should be placed for 20~40 minutes before testing.
2. The free end of the polyester film is folded in half (180°), and the free end of the film and the test plate are respectively clamped up and down on the testing machine. Be sure to keep the peeling surface in line with the test machine line, set the test speed to 300mm/min±10mm/min, start the test, and calculate the peel strength. The general unit is KN/m or N/mm.
The above is a brief introduction to the detection method of plaster adhesion.
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