Test mold and test system for harmful substance release from synthetic material surface

Abstract

The present invention discloses a test mold and a test system for the release of harmful substances from a synthetic material surface layer, and belongs to the field of analytical technology. The test mold for the release of harmful substances from a synthetic material surface layer comprises a mold base and a fixture. A groove is provided on the upper surface of the mold base, and the groove is used to place a synthetic material sample. The depth of the groove is not less than the thickness of the synthetic material sample. The fixture covers the upper surface of the synthetic material sample, and a window is provided on the fixture to expose the synthetic material sample. A plurality of fixings are arranged around the mold base, and the fixture is fixed to the mold base through the fixings, so that the fixture presses the synthetic material sample. The present invention ensures the accuracy of the test results of the release of harmful substances from the surface layer of synthetic materials and the comparability of the test results between laboratories.

Description

Technical Field

[0001] The invention relates to the technical field of analysis, in particular to a test mould and a test system for the release of harmful substances from a synthetic material surface layer. Background Art

[0002] In 2015, students in many parts of my country experienced symptoms such as nosebleeds, coughs, dizziness, and rashes after exercising on sports fields with obvious pungent odors, making "problematic playgrounds" the focus of widespread social attention, and the release of harmful substances in sports fields is considered to be a key indicator for identifying "problematic playgrounds." Prior to this, my country's current product standards for plastic tracks and artificial grass only had some indicators for the content of harmful substances, and none of them involved indicators for the release of harmful substances. In response to the "problematic track" incident, my country has formulated the mandatory national standard GB 36246-2018 "Synthetic Material Surface Sports Fields for Primary and Secondary Schools" (hereinafter referred to as the "new national standard"), which, in addition to adding a number of harmful substance content control indicators, also specially set up harmful substance release indicators that are of general concern to the society and detailed its test methods.

[0003] The determination of harmful substance release is a method that has developed rapidly in my country in recent years and is widely used in the control of harmful substances in many indoor materials and articles. However, many institutions, especially those related to sports venues, have insufficient experience in the testing process, especially for the high-temperature test of harmful substance release at 60°C. Volatiles are mostly high-boiling point substances. Even catalysts, plasticizers, chain extenders and anti-aging agents added in small amounts may contribute greatly to the final result, which is different from the release characteristics of a large number of indoor materials and articles at room temperature.

[0004] According to the requirements of the new national standard, during the test of harmful substance release, the artificially cut surface and bottom surface of the sample need to be covered with aluminum foil. However, for synthetic material surface products such as artificial grass and prefabricated plastic tracks, in the actual test process, the test personnel often have different covering conditions each time due to warping and unevenness of the samples. Therefore, the poor comparability of harmful substance release test results between different institutions has always restricted the healthy development of the industry and hindered the effective implementation of the new national standard. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a test mold and a test system for the release of harmful substances from synthetic material surfaces, which ensure the accuracy of the test results of the release of harmful substances from synthetic material surfaces and the comparability of the test results between laboratories.

[0006] The present invention provides the following technical solutions:

[0007] A synthetic material surface layer harmful substance release test mold, comprising a mold base and a fixture, wherein:

[0008] The upper surface of the mold base is provided with a groove, the groove is used to place the synthetic material sample, the depth of the groove is not less than the thickness of the synthetic material sample, the fixture covers the upper surface of the synthetic material sample, and the fixture is provided with a window to expose the synthetic material sample;

[0009] A plurality of fixing parts are arranged around the mold base, and the clamp is fixed on the mold base through the fixing parts, so that the clamp presses the synthetic material sample.

[0010] Furthermore, the mold base and the fixture are made of materials that do not release harmful substances.

[0011] Furthermore, the mold base and the fixture are made of stainless steel, glass or polytetrafluoroethylene.

[0012] Furthermore, the area of ​​the groove is greater than 0.024m 2 .

[0013] Furthermore, the area of ​​the window is 0.024m 2 .

[0014] Furthermore, the fixing member is a bolt or a buckle.

[0015] Furthermore, the synthetic material sample is a sample of a cast-in-place surface layer, a prefabricated surface layer, a water-permeable surface layer or an artificial turf surface layer.

[0016] A synthetic material surface layer harmful substance release test system comprises an environmental test chamber and the aforementioned synthetic material surface layer harmful substance release test mold, wherein the synthetic material surface layer harmful substance release test mold is used to be placed in the environmental test chamber.

[0017] The present invention has the following beneficial effects:

[0018] The mold base of the present invention covers the artificially cut side and bottom of the synthetic material sample, which can avoid the release of pollutants from the artificially cut side and bottom of the synthetic material sample with uneven surface during the test process. Compared with the aluminum foil coating method, it can ensure the consistency of the experimenter's coating each time. And the surface to be tested is exposed through the window, which can ensure the accuracy and consistency of the exposed area. Therefore, the accuracy of the test results of the harmful substance release amount of the synthetic material surface layer and the comparability of the test results between laboratories are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a test mold for harmful substance release from a synthetic material surface layer of the present invention. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0021] Embodiment 1:

[0022] The embodiment of the present invention provides a test mold for the release of harmful substances from a synthetic material surface layer, such as Figure 1 As shown, it includes a mold base 1 and a fixture 2, wherein:

[0023] The upper surface of the mold base 1 is provided with a groove for placing the synthetic material sample 4. The depth of the groove is not less than the thickness of the synthetic material sample 4. The fixture 2 covers the upper surface of the synthetic material sample 4. The fixture 2 is provided with a window 5 for exposing the synthetic material sample 4.

[0024] A plurality of fixing members 3 are arranged around the mold base 1 , and the clamp 2 is fixed to the mold base 1 through the fixing members 3 , so that the clamp 2 presses the synthetic material sample 4 .

[0025] The present invention is used for testing the pollutant release of synthetic material surface layers such as artificial grass and cast-in-place surface layers. When in use, a synthetic material sample 4 is placed in the groove of a mold base 1, and then a fixture 2 is placed on the upper surface of the synthetic material sample 4, and the fixture 2 is pressed against the synthetic material sample 4 by fixing 3 parts, and the fixed synthetic material sample 4 together with the synthetic material surface layer harmful substance release test mold are placed in an environmental test chamber to perform formaldehyde release, TVOC release and other tests.

[0026] The mold base of the present invention covers the artificially cut side and bottom of the synthetic material sample, which can avoid the release of pollutants from the artificially cut side and bottom of the synthetic material sample with uneven surface during the test process. Compared with the aluminum foil coating method, it can ensure the consistency of the experimenter's coating each time. And the surface to be tested is exposed through the window, which can ensure the accuracy and consistency of the exposed area. Therefore, the accuracy of the test results of the harmful substance release amount of the synthetic material surface layer and the comparability of the test results between laboratories are guaranteed.

[0027] The material of the mold base 1 and the fixture 2 is a material that does not release harmful substances such as formaldehyde or volatile organic compounds. For example, the material of the mold base 1 and the fixture 2 can be stainless steel, glass or tetrafluoroethylene.

[0028] The groove of the mold base 1 is used to place the synthetic material sample 4. The size of the groove 1 is not limited, but the area of ​​the groove 1 should be greater than 0.024m 2 .

[0029] The fixture 2 is used to fix the synthetic material sample 4. Its shape and size should meet the requirements of the mold base 1, and there should be no obvious gap between it and the mold base 1. The size of the window 5 in the fixture 2 must ensure that the exposed area of ​​the synthetic material sample 4 is 0.024m2, that is, the area of ​​the window is 0.024m 2 For example, the size of the window is 30cm*8cm or 12cm*20cm, etc.

[0030] The fixing part 3 can be a bolt, a buckle or other forms of fixing parts. After the synthetic material sample 4 is placed in the groove of the mold base 1 and the fixture 2 is placed, the fixing part 3 plays the role of pressing the synthetic material sample 4.

[0031] The synthetic material sample 4 of the present invention can be a product sample such as a cast-in-place surface layer, a prefabricated surface layer, a water-permeable surface layer or an artificial turf surface layer.

[0032] The test results of the pollutant release of artificial grass, cast-in-place plastic track and other products by the test method of the present invention and the traditional aluminum foil coating method are compared as shown in the following table:

[0033] Synthetic material samples Test items Aluminum foil coating The mold of the present invention Artificial grass <![CDATA[TVOC emission rate / (mg / m 2 ·h)]]> 2.3 1.8 Cast-in-place plastic track <![CDATA[Formaldehyde emission / (mg / m 2 ·h)]]> 0.3 0.2 Silicon PU surface layer <![CDATA[Formaldehyde emission / (mg / m 2 ·h)]]> 5.6 4.2 Artificial grass <![CDATA[TVOC emission rate / (mg / m 2 ·h)]]> 5.3 3.8 Cast-in-place plastic track <![CDATA[TVOC emission rate / (mg / m 2 ·h)]]> 6.4 5.2

[0034] GB 36246-2018 "Synthetic Surface Sports Fields for Primary and Secondary Schools" stipulates that the limit value of TVOC emission is 5.0 mg / m 2 ·h, the limit requirement for formaldehyde emission is 0.4mg / m 2 h. From the above table, it can be seen that the test results of some samples are quite different whether the mold of the present invention is used or not, which may even affect the determination of product eligibility.

[0035] Embodiment 2:

[0036] An embodiment of the present invention provides a synthetic material surface layer harmful substance release test system, which includes an environmental test chamber and the synthetic material surface layer harmful substance release test mold described in the aforementioned embodiment 1, and the synthetic material surface layer harmful substance release test mold is used to be placed in the environmental test chamber.

[0037] The aforementioned environmental test chamber may be an environmental test chamber specified in GB 36246-2018, or an environmental test chamber of other structures that meet the requirements, and the present invention is not limited to this.

[0038] The synthetic material surface layer harmful substance release test system of the embodiment of the present invention includes all technical solutions of the synthetic material surface layer harmful substance release test mold described in Example 1, which has the beneficial effects described in Example 1 and will not be described in detail here. For other matters not mentioned in this embodiment, please refer to the corresponding contents in the aforementioned Example 1.

[0039] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A test mold for harmful substance release from synthetic material surface layer, characterized in that: It includes a mold base and a fixture, wherein: The upper surface of the mold base is provided with a groove, the groove is used to place the synthetic material sample, the depth of the groove is not less than the thickness of the synthetic material sample, the fixture covers the upper surface of the synthetic material sample, and the fixture is provided with a window to expose the synthetic material sample; A plurality of fixing parts are arranged around the mold base, and the clamp is fixed on the mold base through the fixing parts, so that the clamp presses the synthetic material sample.

2. The synthetic material surface layer harmful substance release test mold according to claim 1 is characterized in that: The mold base and the fixture are made of materials that do not release harmful substances.

3. The synthetic material surface layer harmful substance release test mold according to claim 2 is characterized in that: The mold base and the fixture are made of stainless steel, glass or polytetrafluoroethylene.

4. The synthetic material surface layer harmful substance release test mold according to any one of claims 1-3, characterized in that: The area of ​​the groove is greater than 0.024m 2 .

5. The synthetic material surface layer harmful substance release test mold according to claim 4, characterized in that: The area of ​​the window is 0.024m 2 .

6. The synthetic material surface layer harmful substance release test mold according to claim 5, characterized in that: The fixing piece is a bolt or a buckle.

7. The synthetic material surface layer harmful substance release test mold according to claim 6, characterized in that: The synthetic material sample is a sample of a cast-in-place surface layer, a prefabricated surface layer, a water-permeable surface layer or an artificial turf surface layer.

8. A test system for harmful substance release from synthetic material surface layer, characterized in that: It comprises an environmental test chamber and a synthetic material surface layer harmful substance release test mold as described in any one of claims 1 to 7, wherein the synthetic material surface layer harmful substance release test mold is used to be placed in the environmental test chamber.

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