CN202903751U - Simple and easy ultraviolet aging box capable of adsorbing volatile organisms in polymer sample - Google Patents

Abstract

A simple UV aging box that can absorb volatile organic compounds in polymer samples, including aging box body (1), sample chamber (2), UV lamp (3), adsorption tube (4), air pump (5) ; A sample chamber (2) for placing samples (9) is arranged inside the aging box (1), and an ultraviolet lamp for ultraviolet aging of samples (9) in the sample chamber is provided on the top of the sample chamber (2) (3); The adsorption tube (4) used to absorb and enrich the volatile organic compounds produced during the UV aging process of the sample (9) is inserted into the sample chamber (2), and the adsorption tube (4) passes through the hose (8) Connect to air pump (5). The utility model can use ultraviolet lamps to irradiate polymer samples at a set temperature and time to simulate the aging situation under ultraviolet radiation, and the adsorption tube collects volatile organic compounds in the samples for thermal analysis-gas chromatography analysis , to test the volatile organic compounds produced by the sample under ultraviolet irradiation.

Description

A Simple UV Aging Chamber for Adsorbing Volatile Organic Compounds in Polymer Samples

technical field

The utility model relates to the technical field of chemical instruments, in particular to a simple ultraviolet aging box capable of absorbing volatile organic compounds in polymer samples.

Background technique

Aging is one of the natural characteristics of polymer materials and an important indicator in its synthesis, modification and application. The aging of polymer materials is affected by climate factors such as light, heat, oxygen and humidity. However, due to the long time-consuming natural exposure test and the inability to accurately control the influence of various factors on materials, researchers have developed Various artificial accelerated aging test methods are used to study the aging mechanism of polymer materials. Among them, the ultraviolet lamp aging test has a high acceleration rate and can obtain the aging resistance of the material in a relatively short period of time. It is one of the commonly used artificial accelerated aging test methods for polymer materials.

The thermal analysis method is also called the thermal desorption method. The sample tube or the adsorption tube is purged by the carrier gas at a certain temperature, so that the volatile and semi-volatile substances are desorbed from the sample or the adsorbent. It is enriched in the cold trap, and then injected into the cold trap by instantaneous heating for chromatographic analysis. Thermal analysis method is a new detection method for volatile and semi-volatile organic compounds in samples in recent years. Thermal analysis coupled with gas chromatography or gas chromatography-mass spectrometry has broad applications in environmental monitoring, material testing, and food flavor research.

Contents of the invention

The technical problem to be solved by the utility model:

In order to overcome the problem of inconvenient collection of volatile organic compounds produced in polymer samples in the ultraviolet radiation weather resistance test in the prior art, the utility model provides a simple ultraviolet aging box that can absorb volatile organic compounds in polymer samples. The aging box can simulate the aging process of polymers in various types of samples such as environment and materials under ultraviolet light irradiation, and can absorb and enrich the volatile organic compounds produced in the process, so that it can absorb the volatile organic compounds produced in the aging process. Organic matter was analyzed for testing.

Product technical scheme of the present utility model is:

A simple ultraviolet aging box that can absorb volatile organic compounds in polymer samples, the main components include: aging box body 1, sample chamber 2, ultraviolet lamp 3, adsorption tube 4, air pump 5; inside the aging box body 1 A sample chamber 2 for placing the sample 9 is provided, and the top of the sample chamber 2 is provided with an ultraviolet lamp 3 for carrying out ultraviolet aging to the sample 9 in the sample chamber; An adsorption tube 4 for volatile organic compounds is inserted into the sample chamber 2 , and the adsorption tube 4 is connected to an air pump 5 through a hose 8 .

The simple ultraviolet aging box designed by the utility model is also provided with a time control device 6 and a temperature control device 7 for controlling the aging time and aging temperature. Wherein, the control end of time control device 6 is connected with air pump 5 and temperature control device 7 respectively, is connected with air pump 5 and is used for controlling the air pumping time of air pump, i.e. adsorption tube cycle adsorption time; Used to control the heating time of the sample chamber. The control end of the temperature control device 7 is connected to the sample chamber 2 for controlling the heating temperature of the sample chamber.

The adsorption tube 4 is a commercial adsorption tube, or a self-made adsorption tube added with an adsorbent.

The air pump 5 also has a flow control device.

Apply the utility model to carry out the method for aging test as follows:

The first step is to use the aging box to carry out ultraviolet aging experiments on the polymer samples, and use the adsorption tube to absorb the volatile organic compounds produced during the aging process of the polymer samples.

Place the polymer sample in the sample chamber, turn on the power of the UV lamp, and at the same time, turn on the temperature control and time control devices, and use the Tenax adsorption tube to absorb the volatile organic compounds produced by the polymer product during the irradiation process for a certain period of time during the aging process .

The second step is gas chromatography-mass spectrometry test.

Put the sampled adsorption tube into the thermal desorption instrument to heat, so that the desorbed volatile organic compounds are enriched in the thermal desorption cold trap, and the cold trap is heated at a high temperature instantaneously, and detected by gas chromatography or mass spectrometry.

Gas chromatography-mass spectrometry detection conditions are: electron bombardment ionization source, capillary chromatographic column, constant temperature or programmed temperature rise.

The beneficial effects of the utility model are:

The utility model can adsorb and enrich the volatile organic compounds produced in the ultraviolet aging process from various polymer samples with high selectivity, and the thermal desorption instrument-gas chromatograph or the thermal analyser-gas chromatography-mass spectrometer can More accurate determination of the content of volatile organic compounds in the sample.

Description of drawings

Figure 1 is a schematic diagram of the structure of a simple UV aging chamber that can absorb volatile organic compounds in polymer samples.

Figure 2 is a thermal analysis-GC-GC chromatogram of volatile organic compounds produced by a polypropylene sample adsorbed at 60°C and exposed to ultraviolet light for 24 hours using a commercial Tenax adsorption tube.

In the figure, 1 aging box body, 2 sample chamber, 3 ultraviolet lamp, 4 adsorption tube, 5 air pump, 6 time control device, 7 temperature control device, 8 hose, 9 sample.

Detailed ways

Example

(1) Product technical solution of the utility model

In conjunction with shown in Figure 1, the technical product scheme of the utility model is as follows:

A simple ultraviolet aging box capable of absorbing volatile organic compounds in polymer samples, comprising an aging box body 1, a sample chamber 2, an ultraviolet lamp 3, an adsorption tube 4, an air pump 5, a time control device 6, and a temperature control device 7.

In the aging box, the sample chamber 2 is used to hold the sample 9, the ultraviolet lamp 3 is used to generate ultraviolet radiation on the sample, the time control device 6 is used to control the aging time, and the temperature control device 7 is used to control the aging time. During the aging process, the adsorption tube 4 is used to absorb and enrich the volatile organic compounds produced by the sample, and the air pump 5 is used to control the flow rate of the circulating adsorption air. The adsorption pipe 4 is connected with the air pump 5 through a hose 8 .

(2) The technical scheme of the application method of the present utility model

(1) Use an aging box to carry out aging experiments on polymer samples, and use adsorption tubes to absorb volatile organic compounds produced during the aging process of polymer samples.

Before use, the commercial Tenax adsorption tube was aged at 350 °C for 15 min to remove the impurities adsorbed in the air. Install the aged Tenax adsorption tube to the interface of the aging box adsorption tube.

Place 100 g of polypropylene samples in the sample chamber, turn on the power of the ultraviolet lamp, and at the same time turn on the temperature control and time control devices, and set the temperature to 60°C. When the time control device shows aging for 24 hours, use the Tenax adsorption tube to absorb the volatile organic compounds produced by the polypropylene product in the sample chamber during the irradiation process.

(2) Thermal Desorption-Gas Chromatography Test

The Tenax adsorption tube was removed, and the volatile organic compounds were tested by thermal desorption-mass spectrometer. The total ion current chromatogram of the detection results is shown in Figure 2.

In this embodiment, the main detection parameters of the thermal desorption-mass spectrometer are as follows:

Instruments: thermal desorption instrument from Marks Company in the UK, 7890A-5975C gas spectrometer from Agilent Company in the United States.

Thermal analysis conditions: desorption temperature 90°C, desorption time 5min, transfer line temperature 200°C, cold trap temperature -25°C, analysis at 280°C.

Gas chromatography conditions: chromatographic column HP-5MS (30m×0.25mm×0.25μm), programmed temperature rise, 35°C for 5 minutes, 5°C/min to 200°C, and hold for 5 minutes. Transfer line temperature 200°C. Carrier gas He, flow rate 1.0mL/min.

Mass spectrometry conditions: electron bombardment ionization source, electron energy 70eV, source temperature 230°C, full scan acquisition mode, mass range 40~500amu.

Claims (4)

1. the simple and easy ultraviolet ageing case of volatile organic matter in the adsorbable polymer samples, critical piece comprises, ageing oven casing (1), sample chamber (2), uviol lamp (3), adsorption tube (4), pneumatic pump (5); It is characterized in that: be provided with in ageing oven casing (1) for the sample chamber (2) of placing sample (9), the top of (2) is provided with and is useful on the uviol lamp (3) that the sample in the sample chamber (9) is carried out ultraviolet ageing in the sample chamber; Be used for absorption and enriched sample (9) and be inserted in the sample chamber (2) at the adsorption tube (4) of the volatile organic matter that the ultraviolet ageing process produces, adsorption tube (4) links to each other with pneumatic pump (5) by flexible pipe (8).

2. simple and easy ultraviolet ageing case according to claim 1 is characterized in that: it also is provided with time-controlling arrangement (6) and temperature control equipment (7) for control digestion time and aging temperature; Wherein, the control end of time-controlling arrangement (6) links to each other with temperature control equipment (7) with pneumatic pump (5) respectively, and linking to each other with pneumatic pump (5) is to bleed the time for the control pneumatic pump, i.e. the adsorption tube circulation absorption time; Link to each other with temperature control equipment (7) is for Quality control chamber heat time heating time; The control end of temperature control equipment (7) links to each other with sample chamber (2), is used for Quality control chamber heating-up temperature.

3. simple and easy ultraviolet ageing case according to claim 1, it is characterized in that: adsorption tube (4) is the commodity adsorption tube, or has added the self-control adsorption tube of adsorbent.

4. simple and easy ultraviolet ageing case according to claim 1, it is characterized in that: described pneumatic pump (5) is also with volume control device.

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