title>GB/T 2790-1995 Test method for 180 degree peel strength of adhesives - Flexible materials to rigid materials - GB/T 2790-1995 - Chinese standardNet - bzxz.net
Home > GB > GB/T 2790-1995 Test method for 180 degree peel strength of adhesives - Flexible materials to rigid materials
GB/T 2790-1995 Test method for 180 degree peel strength of adhesives - Flexible materials to rigid materials
Basic Information
Standard ID:
GB/T 2790-1995
Standard Name: Test method for 180 degree peel strength of adhesives - Flexible materials to rigid materials
This standard specifies the 180° peel test equipment, sample preparation, test steps and result processing for the adhesive specimens of flexible materials bonded to rigid materials. This standard is applicable to the determination of the 180° peel resistance of adhesives under specified conditions for adhesive specimens composed of two bonded materials (one is a flexible material; the other is a rigid material). GB/T 2790-1995 Adhesive 180° Peel Strength Test Method Flexible Material to Rigid Material GB/T2790-1995 Standard Download Decompression Password: www.bzxz.net
Some standard content:
National Standard of the People's Republic of China Adhesives, 180° peel strength test methodfor a flexible-bonded-to-rigid testspecimen assembly GB/T 2790—1995 Replaces GB27908! This standard is equivalent to ISO8510-2:1990 "Adhesives—Peel test for specimens of adhesive bonded to flexible materials and rigid materials Part 2: 180° peel test". 1 Subject content and scope of application This standard specifies the equipment, specimen preparation, test procedures and result processing for the 180° peel test of adhesive specimens of flexible materials and rigid materials. www.bzxz.net This standard is applicable to the determination of the 180° peeling resistance of adhesives under standard conditions for adhesive specimens composed of two bonded materials (one is a flexible material and the other is a rigid material). 2 Reference standards GB2918 Standard environment for state adjustment and testing of plastic specimens 3 Principle Two bonded materials are prepared into bonded specimens with adhesives, and then the bonded specimens are peeled off from the bonding opening at a specified rate, and the two adherends are gradually separated along the length of the bonded surface. The peeling force applied by the flexible adherend is basically parallel to the bonding surface. 4 Apparatus 4.1 Tensile test device A device with an appropriate load range, in which the chuck can separate and apply tensile force at a constant rate, and the device should be equipped with a powerful measurement system and an indication and recording system. The error of the force indication shall not exceed 2%. The response time of the entire device should be short enough not to affect the accuracy of the measurement, that is, when the bonded specimen is destroyed, the applied force can be measured. The breaking load of the specimen shall be between 10% and 80% of the full load. 4.2 Grips One of the grips can firmly clamp the rigid adherend (see 5.1.1) and make the bonding surface parallel to the applied force. The other grip, as shown in Figure 1, can fix the flexible adherend (see 5.1.2). This grip is self-calibrating, so the applied force is parallel to the bonding surface and is connected to the sensor of the tensile test device (4.1). 5 Specimens 5.1 Adhesive Materials The thickness of the adhered material should be suitable for withstanding the expected tensile force. Its dimensions should be accurately measured and written in the test report. Approved by the State Administration of Technical Supervision on December 20, 1995 168 Implemented on August 1, 1996 GB/T2790—1995 Note: The thickness of the bonded test piece shall be agreed upon by the adhesive supplier and the demander. The recommended thickness of the bonded test piece is: 1.5mm for metal; 1.5mm for plastic; 3mm for wood; 2mm for vulcanized rubber. The thickness and type of the flexible bonded test piece have a great influence on the test results and must be recorded. When the bonded test piece thickness is greater than 1mm, the thickness measurement shall be accurate to 0.1 nm; when the bonded test piece thickness is less than 1mm, the thickness measurement shall be accurate to 0.001 mmrm. 5.1.1 Rigid bonded test piece Rigid bonded test pieces shall be 25.0mm±0.5mm wide, unless otherwise specified11, and shall be strips of more than 200mm long. 5.1.2 Flexible bonded test piece Flexible bonded materials can be bent 180° without serious irreversible deformation. Unless otherwise specified, the length of the flexible bonded test piece shall not be less than 350 mm. Its width is: The same as the rigid bonded test piece for materials with non-wearing edges, a. b. For materials with easily worn edges, such as cotton canvas, the test piece is 5 mm wider on both sides than the rigid bonded test piece. Note: Flexible bonded test pieces may cause difficulties in production and increase the deviation of test results due to flexure or swing damage during specimen production and testing. Designing the flexible bonded test piece to be 5 mm wider on both sides than the rigid bonded test piece can reduce the above effect. 5.2 Preparation of test pieces The surface preparation of the test pieces and the use of adhesives shall be carried out according to the product instructions of the adhesives. Apply glue over the entire width of each bonded test piece, with a length of 150 mm. Note: A suitable method to obtain a bonded surface with clear edges is to place a thin strip of material (anti-adhesive tape) at the end of the bonded material to be separated, so that the part of the test piece that does not need to be bonded is not adhered by the adhesive (see Figure 1). Pull Rigid adherend Anti-adhesive strip (see note 5.2) Burning adherend Head (to aid calibration) Figure 1 Schematic diagram of 180° peel test of adhesive specimens bonded to flexible materials and rigid materials. Instructions for use: 1] International standards do not have "unless otherwise specified". 27 International standards stipulate that surface treatment shall be carried out in accordance with ISO) 458889 "Adhesives-Treatment of bonded metal surfaces". If this cannot be achieved, it shall be carried out in accordance with the product manual. Since there is no standard corresponding to IS() 4588 in my country, it is only stipulated in this regard that it shall be carried out in accordance with the adhesive product manual. 169 GB/T 2790—1995 The test pieces to be bonded are bonded in the manner recommended by the adhesive manufacturer and the adhesive is cured. If pressure is required for the preparation of the specimen, a uniform pressure should be applied over the entire bonding surface. The recommended pressure is 1 MPa. It is best to be equipped with a timed withdrawal device. In order to obtain a uniform pressure distribution over the entire bonding surface, the press plates should be parallel. If this is not possible, a flexible gasket with a thickness of about 10 mm and a hardness (Shore A) of about 45 degrees should be slightly covered on the press plate. In this case, it is recommended to apply a pressure of up to 0.7 MPa. Another method of specimen preparation is to bond two appropriately sized plates into an expanded specimen and then cut the specimen from the expanded specimen. The cutting should minimize the influence of cutting heat and mechanical forces on the adhesive joint. The outermost 12 mm wide strip of the expanded specimen parallel to the specimen must be removed. Determine the average thickness of the adhesive layer of the specimen. 5.3 Number of samples The number of samples for each batch number shall not be less than five. 6 Conditioning and test environment The samples shall be conditioned and tested in the standard environment 41 specified in GB2918. The time for condition conditioning of the samples shall not be less than 2 hours. 7 Test steps Bend the unbonded end of the sinterable bonded test piece by 180°, clamp the rigid bonded test piece on the fixed clamp, and clamp the flexible test piece on the other clamp. Care should be taken to position the specimen accurately between the chucks to ensure that the applied tensile force is evenly distributed over the width of the specimen (see Figure 1). Start the machine and separate the upper and lower chucks at a constant rate. The separation rate of the chucks is 100 ± 10 mm/min. Other rates are agreed upon by the adhesive supplier and the demander. Record the separation rate of the chucks and the force applied when the chucks are separated, preferably automatically. Continue the test until at least 125 mm of the bond length is peeled off. Note the type of bond failure, i.e., adhesion failure, cohesive failure, or adherend failure. Note: During the peeling process, the peeled flexible part sometimes rubs against the bonded part. In order to reduce friction, an appropriate lubricant, such as oil or soapy water, can be used as long as it does not affect the adherend. 8 Processing of test results For each specimen, the peel force and peel length are measured. The average peel force is measured on the relationship curve. The unit is N. The peeling length for calculating the peel force must be at least 100mm, but does not include the initial 25mm. You can draw an estimated contour line (see Figure 2) or use the area measurement method to obtain the semi-average peel force. If more accurate results are required, other appropriate methods can also be used. Record the maximum and minimum peel force within this peeling length of at least 100mm. Calculate the corresponding peel strength value: Onxc=B ; 0ig—180° peel strength, kN/m; F—peel force, N; B---sample width, mm. Calculate the average peel strength, minimum peel strength and maximum peel strength of all test specimens, as well as their arithmetic mean. Note: If necessary, the initial peak occurring outside the specified peeling length.It can be recorded separately and pointed out in the test report later. It is recommended not to be included in the process of finding the average value. Instructions for use: 17 International standards do not directly specify the state adjustment time of the sample. 2! In international standards, the test results are expressed in terms of peeling force. 170 9 Test report The test report includes the following parts: Referenced standard number; GB/T 2790--- 1995 Typical peel force curve Estimated average peel force Brake length, mm Complete identification of the adhesive used in the test, including type, source, product brand, batch or lot number, form, etc.; complete description of the bonded material, especially thickness, size, type of material and surface treatment method; description of the bonding process, including the application method of the adhesive, drying or curing conditions, bonding temperature and pressure; average thickness of the adhesive layer after bonding; complete description of the specimens, including dimensions, structure and number of specimens; pre-test condition and test environment; rate of separation of the ends; method of determining the average peel force; the maximum, minimum and average peel strength of each specimen and their arithmetic mean, in kN/m; type of damage to each specimen, i.e., adhesion failure, cohesive failure or bonded material failure; any non-compliance with the prescribed procedures that may affect the test results. Additional Notes: This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Shanghai Rubber Products Research Institute. This standard was drafted by Shanghai Rubber Products Research Institute. The main drafter of this standard is Zhang Wengang. This standard was first published in 1981 and revised in 1994. 171 Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.