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Waterborne veneer glue common test party
Time:2019-07-30 13:27:58    Page view (74)

Waterborne veneer glue common test party

Waterborne veneer glue common test party

OBJECTIVE: To collect some typical test methods for evaluating the performance of adhesives by furniture companies, systematically analyze the advantages and disadvantages of each method, and find an ideal test method for evaluating the bond strength of water-based adhesives.
 First, D3 test:
1. The sample is cured for 7 days; 2. The sample is immersed in cold water at room temperature for 6 hours; 3. The sample is placed in a 40 +/- 3C oven for at least 18 hours until the sample moisture content falls to the pre-test level. 4, check the crack rate of the glue line.
 The method is suitable for quality monitoring of customer products, and the furniture products that pass the test generally can guarantee the quality, but can not distinguish the advantages and disadvantages of the adhesives used.
 Second, D4 test:
1. The sample is cured for 7 days; 2. The sample is immersed in boiling water for 4 hours; 3. The sample is immersed in cold water at room temperature for 1 hour; 4. The sample is placed in an oven of 50 +/- 3C at least 18 hours, until the sample moisture content fell to the pre-test level; 5, check the gel line cracking rate.
 From the samples taken from the furniture factory production line, the deformation degree of the adjacent substrates in the boiling process is inconsistent, and a large stress is generated at the bonding surface, and the wet strength of the glue is often limited, and it is generally difficult to overcome the stress. Therefore, the glue line is prone to cracking. If this method is used in the test, it is difficult to objectively evaluate the quality of the adhesive due to the difference in the substrate.
 Third, JAS cold water soaking peel test:
1. The sample is cured for 7 days; 2. The sample is immersed in cold water at room temperature for 6 hours; 3. The sample is placed in a 40 +/- 3C oven for at least 18 hours until the sample moisture content falls to the pre-test level. 4, check the crack rate of the glue line. Similar to D3.
 Fourth, JAS boiling water soaking peel test:
1. The sample is cured for 7 days; 2. The sample is immersed in boiling water for 4 hours; 3. The sample is immersed in cold water at room temperature for 1 hour; 4. The sample is placed in an oven of 70 +/- 3C. At least 18 hours, until the sample moisture content drops to the pre-test level; 5, check the gel line cracking rate.
 This test is more severe than D4 (higher drying temperature), and the glue line is more susceptible to cracking due to the two stresses caused by the water swell and water shrinkage of the substrate. Therefore, the test results will be more affected by the substrate.

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