This paper introduces a method for measuring the adhesion between layers of chlorinated rubber anticorrosive paint and similar products. Although this method can only make qualitative judgment, it is of great significance in the consideration of coating material selection and supporting system because it is consistent with practical application. The tools and materials are described in detail, as well as the procedures for testing the adhesion between the primer and the middle coat, and between the top coat and the middle coat. This approach in the industry standard HG/T 2798 in chlorinated rubber coatings have been mentioned.

1. Introdução

Na indústria de revestimentos, the evaluation of coating adhesion is one of the key factors to ensure the performance and service life of coatings. This paper introduces a method for measuring the adhesion between layers of chlorinated rubber anticorrosive paint and similar products.

Adesão entre o método de teste de camadas e sua aplicação

2. Tools and materials

In order to test, the adhesion between the layers you need the following tools and materials:

Artist sculpting knife: for cutting coating sample.

The size of the ruler: used for measuring the coating sample.

Scotch tape: Used in the test step to evaluate the coating adhesion performance.

Filter paper: Used to cover the scotch tape over the coating before testing.

3. O método

3.1 primer and middle layer adhesion between the paint

3.1.1 sample preparation on one side of a plate with a etch primer, two primer for 48 hours after coating (24 horas). Depois 7 days, xenon lamp accelerated aging test was performed for 180 horas. Take out the sample, place it for 24 horas, then apply two intermediate coats (24 hours apart), let it stand horizontally and dry for 7 days, and prepare three qualified samples.

3.1.2 Steps of adhesion test

Hanging from a hook will test sample for 24 hours in the hot and humid test chamber, temperatura de 50 + 1 ° C, relative humidity is more than 95%.

Immediately after removing the sample, gently cover the filter paper over the painted surface to absorb excess moisture.

Use art sculpting knife blade, in the middle of the test sample location in parallel to the short side, the direction of the interval of 15 mm cutting two treaties line 40 mm de comprimento, cut through the film to the floor.

In the central part where the cutting lines cross, attach the vertical direction of the cutting lines with scotch tape. One end of the tape needs to be turned back 20mm for tearing and pulling.

Press the tape firmly back and forth with your thumb to ensure that it adheres firmly to the coating, then quickly pull one end of the tape at a right Angle to remove the tape.

Check the lacquer film after tearing. If two or more than two pieces of test samples of the primer paint film with an intermediary between paint film does not occur, or strip width under 3 milímetros, is judged to be “without exception”.

3.2 surface adhesion between the paint and the middle layer

3.2.1 Sample Preparation Apply a phosphating primer to one side of a steel plate for 4 horas, then apply an intermediate primer for 24 horas, then apply a topcoat for 7 days, and conduct an accelerated xenon lamp aging test for 180 horas. Take out the sample, after 24 horas, and a middle tier paint besmear again paint, make its horizontal and drying, 7 days preparation of three pieces of qualified samples.

3.2.2 Adhesion Test Procedure The operation procedure is the same as that in 3.1.2.

Adesão entre o método de teste de camadas e sua aplicação

4.4 Conclusão

Through the above method of testing, if two or more test samples in the adhesion test, primer e tinta de camada intermediária ou tinta superior e tinta de camada intermediária não descascam, ou a largura da casca é inferior a 3 mm, é julgado como “nenhuma anormalidade”.

5. Padrões de referência

O método descrito neste artigo refere-se ao padrão da indústria HG/T 2798, revestimentos de borracha clorada.

Conclusão

É garantir que a adesão do revestimento entre as camadas de um dos importantes índices de desempenho estável e durabilidade. Embora este método só possa fazer um julgamento qualitativo, está próximo do uso real, e tem grande importância para a seleção de revestimentos e suporte ao projeto do sistema. Na indústria de tintas, uma avaliação precisa da adesão ajudará a garantir que a qualidade do revestimento e o desempenho, garantindo assim a aplicação a longo prazo do revestimento.