Glass fiber cloth infiltrating testing method

Abstract

In a glass fiber cloth infiltrating testing method, the perspective test for the glass fiber cloth in the infiltrating process in resin is carried out through an infrared transmitting light source; the incompletely permeant glass fiber sample has bad light transmittance and the completely permeant sample has good light transmittance according to the difference of reaction and infiltration degrees between the resin and the glass fiber cloth on different time points and the difference of the light transmittance of infrared waves for the glass fiber cloth, thereby obtaining the time-varying curve of the light transmittance of the testing sample in infiltrating process; and the data is converted into light transmittance data so as to analyze and compare the infiltrating property of the testing glass fiber cloth by testing and drawing the curve.

Description

technical field [0001] The patent of the present invention relates to an instrument for testing the wettability of electronic-grade glass fiber cloth for reinforcement in the printed circuit board industry and its testing method. Background technique [0002] Wetting test plays a very important role in the production and application of glass fiber cloth. The molding process of various glass fiber reinforced materials requires excellent wettability between the glass fiber reinforced material and the resin matrix, so as to endow the glass fiber reinforced material with good interfacial bonding performance and prevent the internal bonding of the board in high temperature and high humidity environments. Defective cracks will eventually lead to plate delamination or failure of insulation reliability. The glass fiber fabric with good wettability not only has a better interface bonding ability with the resin matrix, which greatly improves the reliability of the board, but also mea...

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Problems solved by technology

However, since the volatilization of the solvent in the resin will affect the test results, especially in the case of more experiments one by one, it is required that the experiment should be fast and the resin should not test too many samples each time.

And the storage time of the resin itself also affects the test results, so it is difficult to fix the test environment, resulting in poor repeatability of the test results

In addition, the experiment mainly relies on naked eye observation to judge whether the glass fiber fabric is well infiltrated. The accuracy of each person's judgment of the end point of the experiment and the reaction time of each person according to the stopwatch are different. Therefore, the error between personnel is large, resulting in poor repeatability of the experiment.

[0017] The patent application number is 200410096187.6, and the patent name is a method for testing the wetting characteristics of composite material reinforcements and the invention patent of testing instruments. In the invention patent, an instrument is proposed to test the wetting characteristics of various reinforcing materials, but the testing principle is to test the liquid The quality change of the reinforcement material when the reinforcement material is infiltrated is very similar to the principle of measuring the surface tension of the liquid before. It is mainly to investigate the capillary rise of the resin or small organic molecule solvent on the reinforcement material during the infiltration process. Resin systems that cannot form capillary rise on the reinforcement cannot use this test method

Also, if the mass changes of the two reinforcing materials are the same, it is impossible to judge which material has better wettability, so it is still impossible to clearly identify the wettability of the reinforcing material, and it is impossible to really understand the latitude and longitude of the resin on the reinforcing material Two-way, and the infiltration and penetration process of warp and weft interweaving points

[0018] Among all the existing test methods listed above, the first method is an indirect test method, which cannot reflect the real situation of the fiber fabric during the soaking process, so the test results are often not used as a reference or to guide production

Other test methods have poor repeatability and large human interference factors, and cannot be used to accurately and quickly test and compare the wettability of various glass fiber fabrics.

The instruments and methods introduced in the above-mentioned patents are also methods for indirect testing of quality changes, and it is impossible to truly understand the changes in the degree of infiltration of reinforcing materials over time. Therefore, the development is simple, fast and suitable for glass fiber cloth and glass fiber non-woven fabrics or Instruments for wettability testing of other fabrics are very necessary

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