Coating standard: Standard for determination of storage life of adhesives

Core tips: 1 Subject content and scope of application This standard specifies the storage period determination of adhesives This standard is applicable to determine the storage period of adhesive under specified conditions by measuring the change of viscosity or bonding strength before and after storage 2 Reference standards GB / T 2790-1995 test method for 180 ° peel strength of adhesives (flexible materials to steel materials) (iso8510-2:1990) Adhesive T-Peel strength test method (flexible material to flexible material) GB/T 2 Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Coating home news: 1 Subject content and scope of application this standard specifies the storage period of adhesives This standard is applicable to determine the storage period of adhesive under specified conditions by measuring the change of viscosity or bonding strength before and after storage 2 Reference standard GB / T 2790-1995 adhesive 180 ° peel strength test method (flexible material to steel material) (iso8510-2:1990) GB / T 2791-1995 adhesive T-Peel strength test method (flexible material to flexible material) GB / T 2794-1995 adhesive viscosity determination GB / T 7124-1986 adhesive tensile shear strength determination (metal to metal) (ISO 4587:1979) GB / T 17517-1998 test method for compressive shear strength of adhesives (wood and wood) (ISO 6238:1987) 3 The following definitions are adopted in this standard: storage life; shelf life under specified conditions, the adhesive can still maintain its operation performance and the maximum storage time of specified strength 4 According to the sampling method specified in the adhesive product standard, take at least three samples filled with 500ml cap container from the newly produced adhesive, and seal them for testing (if the package of the sample is less than 500ml, it is unnecessary to separate them) 5 Equipment 5.1 viscometer: any type of viscometer applicable to the tested adhesive (Note: rotor viscometer is recommended.) 5.2 constant temperature control box: temperature fluctuation range is ± 2 ℃ 5.3 container: glass bottle with cover or other containers that do not react with adhesive can also be negotiated by the supplier and the demander separately 5.4 balance: sensitivity is 0.lg 5.5 testing machine: a testing machine with specified loading speed and automatic centering fixture 6 Test conditions 6.1 test storage conditions: generally (23 ± 2) ℃, the time shall be determined by both parties If the adhesive has special requirements, the storage conditions can be separately agreed by the supplier and the demander 6.2 test conditions: the temperature is (23 ± 2) ℃, and the relative humidity of the humidity sensitive adhesive needs to be controlled to be 50% ± 5% 7 Test step 7 1 store the sealed samples to be tested in a constant temperature oven at (23 ± 2) ℃ or under the conditions specified in the adhesive operation manual 7.2 place one of the containers that has been divided into test samples under the set conditions of test samples immediately at the beginning of storage for at least 4 hours 7.3 the viscosity of the adhesive shall be determined according to the provisions of GB / T 2794 7.4 prepare the adhesive according to the instructions 7.5 prepare the bonding sample according to the instructions for use of the adhesive, and measure the bonding strength according to GB / T 2790, GB / T 7124, GB / t2791, GB / T 17517 or other relevant national standards 7.6 during storage, take the separately packed samples at a certain time interval and operate according to the provisions of article 7.2-7.5 (at least twice) 8 The longest storage time for the adhesive to maintain its operation performance and specified strength is taken as the storage period, which can be expressed in time unit (year, month, etc.) 9 The test report test report shall include the following contents: A adhesive type, source, production batch number, shape, production date and test date; B adhesive storage conditions, including temperature, storage time, container type and specification; C adhesive test dosage and preparation proportion; D standards and temperature used for viscosity measurement and model of viscometer; e Detailed description of standards and sample preparation for adhesive strength measurement; F viscosity or adhesive strength data before and after storage; g test results; h other observed phenomena that may affect adhesive performance, such as precipitation, discoloration, stratification, agglomeration or gel; I other matters to be explained Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,