Sample preparation method for factory inspection of elastic adhesive

Abstract

The invention discloses a sample preparation method for factory inspection of an elastic adhesive. The method comprises the following steps of: extruding an adhesive sample at one end of a rectangularmold groove, and filling the whole mold groove with the adhesive along the same direction by using a metal scraper; pushing out the redundant adhesive along one end of the mold by using a glass rod to form an adhesive layer with a horizontal surface; curing the prepared mold at room temperature for a certain period of time, and performing direct demolding; and cutting a rubber sheet into test sample strips by using a cutting knife with a specified model after performing demolding. The sample preparation method disclosed by the invention is simple and convenient to operate, low in sample preparation cost and high in efficiency; the rubber sheet prepared by the method has few defects such as flat surface, bubbles and flashes; different test sample strips can be prepared by using with different cutters on the basis of the method; the defect positions can be selectively avoided, the quality of the sample strips is greatly improved, a good premise is provided for adhesive performance detection, the accuracy of detection data is improved, batch detection is realized, and the detection efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of elastic adhesives, in particular to a sample preparation method for elastic adhesives for factory inspection. Background technique [0002] Due to its high elasticity, strong adhesion, and excellent allowable strain and allowable stress, elastic adhesives are widely used in bonding glass, metal, composite materials and other products. The common application modules in the rail transit field are former Bonding, sealing and waterproofing of windows, hoods, side windows, floors, skins, seats and other products; Among them, elastic adhesives such as polyurethane and modified silane are the most widely used, and their excellent properties are as follows: 1) High Elasticity; 2) Low creep and anti-relaxation; 3) High strength; 4) Anti-humid heat aging; 5) Excellent UV resistance; 6) Excellent thixotropy; 7) Long-term fatigue strength. [0003] Elastic adhesives used in the rail transit field usually use a shear...

AI Technical Summary

Problems solved by technology

[0004] 1) At present, the method of solidifying and forming a film with a dumbbell-shaped mold is mostly used for sample preparation. This mold can only prepare one sample at a time, and at least 5 samples are required for testing, so this sample preparation method requires a large number of molds;

[0005] 2) The size of the dumbbell-shaped mold is small, and it is inconvenient to operate and clean

[0006] 3) The size of the dumbbell-shaped mold is small, and there are inevitably pores in the sample preparation film, which will affect the test results, the prepared film cannot be used, and the qualified rate of sample preparation is low;

[0007] 4) Using a dumbbell-shaped mold, when the film is released from the mold, it is easy to have flashing. The flashing part needs to be trimmed, which will cause incoherent cuts around the film and inaccurate test results.

[0008] 5) In addition to the sample preparation method of dumbbell-shaped mold solidification into film, there is also the sample preparation method of extrusion film formation. This method has a small contact area between the liquid adhesive and air and a long curing time period.

[0009] From the above analysis, it can be seen that the existing sample preparation methods for tensile testing, due to the large number of molds required, low pass rate of sample preparation, long curing cycle and other factors greatly affect the efficiency of the test

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