Aging test method of PVC material

Abstract

The invention discloses an aging test method of a PVC (polyvinyl chloride) material, which comprises the following steps: acquiring PVC material detection samples, marking each sample, and recording the information of each detection sample; placing the PVC test sample in an aging oven for accelerated aging test, recording test environment parameters in real time, and drawing an aging performance curve graph according to the test environment parameters; wherein the accelerated aging test method is determined according to the information of the PVC material and comprises at least one of an ultraviolet aging test, a thermo-oxidative aging test and a chemical medium erosion test, and the aging performance test indexes comprise appearance, physical performance and chemical performance; comparing the aging performance test data of the PVC material with the standard requirements, and evaluating whether the aging performance test data meets the aging test requirements or not; and for the PVC material which does not meet the aging test requirement, analyzing and determining the reason for the abnormal performance of the PVC material according to the performance change of the PVC material. According to the aging test method for the PVC material, the aging state of the PVC material can be comprehensively evaluated, so that the reliability of a product can be improved, and the service life of the product can be prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of material performance testing, and in particular to an aging testing method for PVC materials. Background Art

[0002] PVC is a thermoplastic material with good physical properties and chemical stability. It is widely used in technical fields such as construction, wires and cables, packaging, and medical equipment. In the PCB manufacturing process, PVC materials are widely used in various PCB equipment, such as vertical lines for electroplating and horizontal lines for various processes. PVC materials have excellent corrosion resistance, insulation and processing properties, but they are easily affected by environmental factors such as light, heat, and oxygen and age. When PVC materials age, it will affect product quality and service life.

[0003] In the prior art, the aging test of PVC materials is mainly carried out through the natural aging test method, which places the PVC samples in the natural environment for long-term exposure. The test cycle is long and it is impossible to provide timely feedback on the material performance, which affects the stability of the product.

[0004] In view of this, an object of the present invention is to provide an aging test method for PVC materials, so as to comprehensively evaluate the aging performance of PVC materials. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an aging test method for PVC materials, which can comprehensively evaluate the aging state of PVC materials and further improve the reliability and service life of products.

[0006] The technical solution of the present invention is as follows:

[0007] A method for testing aging of PVC materials comprises the following steps:

[0008] Step S1, obtaining PVC material test samples, marking each sample, and recording information of each test sample;

[0009] Step S2, placing the PVC test sample in an aging box for accelerated aging test, and recording the test environment parameters in real time, and drawing an aging performance curve according to the test environment parameters; wherein the accelerated aging test method is determined according to the information of the PVC material, including at least one of ultraviolet aging test, thermal oxygen aging test, or chemical medium corrosion test, and the aging performance test indicators include appearance, physical properties and chemical properties;

[0010] Step S3, comparing the aging performance test data of the PVC material with the standard requirements to evaluate whether it meets the aging test requirements;

[0011] Step S4, for the PVC material that does not meet the aging test requirements, analyze and determine the cause of the abnormal performance of the PVC material according to its performance changes.

[0012] Furthermore, when conducting UV aging tests, environmental parameters include UV wavelength, UV exposure time, and UV exposure intensity;

[0013] When conducting thermal oxygen aging tests, the test is conducted in a high temperature and high humidity environment and a cyclic temperature and humidity change environment, and under the action of oxygen, where the environmental parameters include temperature and humidity;

[0014] When conducting chemical medium corrosion tests, immersion, spraying or wiping methods are used, and the environmental parameters include the time and frequency of chemical medium corrosion.

[0015] Furthermore, in the high temperature and high humidity environment, the temperature is set to 60-80°C and the humidity is set to 90-98%; the cycle temperature and humidity environment simulates a day and night cycle environment.

[0016] Furthermore, during the UV aging test, the UV wavelength was selected to be UV-A or UV-B, and the UV irradiation intensity was 0.5 W / m 2 or 1.0W / m 2 , the UV exposure time is determined according to the use environment and expected life of the PVC material.

[0017] Furthermore, the appearance of the aging performance test indicators includes color change, surface crack change and material deformation; the physical properties include tensile strength, hardness and impact strength; and the chemical properties include thermal stability and chemical corrosion resistance.

[0018] Compared with the prior art, the aging test method for PVC materials provided by the present invention has the following beneficial effects:

[0019] The aging test method for PVC materials provided by the present invention comprehensively evaluates the aging state of PVC materials by performing ultraviolet aging tests, thermal oxygen aging tests and chemical medium corrosion tests on PVC materials, thereby ensuring the quality and service life of PVC materials used in products. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention and to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific implementation modes of the present invention are further described below.

[0021] It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as there is no conflict between them.

[0022] A method for testing aging of PVC materials comprises the following steps:

[0023] Step S1, obtaining PVC material test samples, marking each sample, and recording information of each test sample;

[0024] Specifically, the PVC material is cut, polished, cleaned, and processed to prepare samples that meet the experimental requirements. Each sample is marked and its material type, color, thickness, application environment, and other information are recorded to ensure the traceability of the test process.

[0025] Step S2, placing the PVC test sample in an aging box for accelerated aging test, and recording the test environment parameters in real time, and drawing an aging performance curve according to the test environment parameters; wherein the accelerated aging test method is determined according to the information of the PVC material, including at least one of ultraviolet aging test, thermal oxygen aging test, or chemical medium corrosion test, and the aging performance test indicators include appearance, physical properties and chemical properties;

[0026] Specifically, the corresponding aging test method is selected according to the information marked on the PVC material. During the ultraviolet aging test, the environmental parameters include ultraviolet wavelength, ultraviolet irradiation time and ultraviolet irradiation intensity. The UV-A or UV-B band that has the greatest impact on the aging of the PVC material is selected for irradiation, and the ultraviolet irradiation intensity is set to 0.5W / m 2 or 1.0W / m 2 The irradiation time is determined according to the use environment and expected life of the PVC material, such as continuous irradiation for 24 hours or intermittent irradiation;

[0027] When conducting thermal aging tests, the tests are conducted in high temperature and high humidity environments and in cyclic temperature and humidity changes environments, and under the action of oxygen. Correspondingly, the environmental parameters include temperature and humidity. In the high temperature and high humidity environment, the temperature is set to 60-80°C and the humidity is 90-98%. The cyclic temperature and humidity environment is simulated according to the day and night cycle and the seasonal cycle to more realistically reflect the aging of PVC materials. In order to ensure the accuracy and repeatability of the test results, the temperature and humidity control accuracy must be within ±1°C and ±2%RH.

[0028] When conducting chemical medium corrosion test, immersion, spraying or wiping methods are adopted, and the environmental parameters include the time and frequency of chemical medium corrosion; among them, chemical media that PVC materials may contact in the actual use environment are selected as corrosion media, such as acid, alkali, salt, etc., and the method of chemical corrosion, as well as the time and frequency of corrosion are selected according to the properties of the chemical medium and the use environment of the PVC material, so as to fully simulate the aging situation in the actual use process.

[0029] The appearance indicators in the aging performance test indicators include color change, surface crack change and material deformation, that is, observe whether the PVC material has obvious color changes during the aging process, such as yellowing, darkening, etc., whether there are cracks on the surface of the PVC material, and whether deformation occurs during the aging process, such as warping, shrinkage, etc.;

[0030] The physical properties in the aging performance test indicators are mainly mechanical properties, including tensile strength, hardness and impact strength;

[0031] The chemical properties in the aging performance test indicators are mainly reflected in thermal stability, chemical corrosion resistance and environmental protection performance. The thermal stability of PVC materials before and after aging is tested by a thermogravimetric analyzer to analyze its temperature resistance. The PVC material is corroded by chemical media to observe whether corrosion, swelling and other phenomena occur, so as to evaluate its chemical corrosion resistance. The environmental protection performance is evaluated by testing whether the PVC material releases harmful substances during the aging process.

[0032] During the accelerated aging test, a test environment parameter-aging performance curve is generated according to the specific aging test method, thereby intuitively reflecting the impact of the test environment parameters on the aging performance parameters.

[0033] Step S3, comparing the aging performance test data of the PVC material with the standard requirements to evaluate whether it meets the aging test requirements;

[0034] If the aging performance parameters detected are within the aging test standard requirements, the PVC material is judged to meet the aging test requirements, otherwise the PVC material does not meet the aging test requirements. The reliability of the same batch of products can be judged by the ratio of samples that meet the aging test requirements.

[0035] Step S4, for PVC materials that do not meet the aging test requirements, analyze and determine the reasons for the abnormal performance of the PVC materials according to their performance changes, so as to provide a reference for material selection of the product.

[0036] Therefore, the aging test method for PVC materials provided by the present invention can comprehensively evaluate the aging state of PVC materials, thereby ensuring the quality and service life of PVC materials used in products.

[0037] The embodiments of the present invention are described in detail above, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations made to these embodiments without departing from the principles and spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A method for testing aging of PVC materials, characterized in that: The steps include: Step S1, obtaining PVC material test samples, marking each sample, and recording information of each test sample; Step S2, placing the PVC test sample in an aging box for accelerated aging test, and recording the test environment parameters in real time, and drawing an aging performance curve according to the test environment parameters; The accelerated aging test method is determined according to the information of the PVC material, including at least one of a UV aging test, a thermal oxygen aging test, or a chemical medium corrosion test, and the aging performance test indicators include appearance, physical properties, and chemical properties; Step S3, comparing the aging performance test data of the PVC material with the standard requirements to evaluate whether it meets the aging test requirements; Step S4, for the PVC material that does not meet the aging test requirements, analyze and determine the cause of the abnormal performance of the PVC material according to its performance changes.

2. The aging test method for PVC material according to claim 1, characterized in that: When conducting UV aging tests, environmental parameters include UV wavelength, UV exposure time, and UV exposure intensity; When conducting thermal oxygen aging tests, the test is conducted in a high temperature and high humidity environment and a cyclic temperature and humidity change environment, and under the action of oxygen, where the environmental parameters include temperature and humidity; When conducting chemical medium corrosion tests, immersion, spraying or wiping methods are used, and the environmental parameters include the time and frequency of chemical medium corrosion.

3. The aging test method for PVC material according to claim 2, characterized in that: In the high temperature and high humidity environment, the temperature is set to 60-80℃ and the humidity is 90-98%; the cycle temperature and humidity environment simulates the day and night cycle environment.

4. The aging test method for PVC material according to claim 2, characterized in that: During the UV aging test, the UV wavelength was selected as UV-A or UV-B, and the UV irradiation intensity was 0.5W / m 2 or 1.0W / m 2 , the UV exposure time is determined according to the use environment and expected life of the PVC material.

5. The aging test method for PVC material according to claim 1, characterized in that: The appearance of the aging performance test indicators includes color change, surface crack change and material deformation; the physical properties include tensile strength, hardness and impact strength; the chemical properties include thermal stability and chemical corrosion resistance.