Tabletting tool and system suitable for detecting monomer content in polypropylene copolymer

Abstract

The utility model discloses a tabletting tool and system suitable for detecting the content of monomers in a polypropylene copolymer, and belongs to the technical field of scientific analysis instruments. The tabletting tool suitable for detecting the monomer content in the polypropylene copolymer comprises an upper template, a lower template and a circular ring arranged between the upper template and the lower template, and the lower surface of the upper template is a convex surface. The upper surface of a film sample obtained by a hot-pressing method through the tabletting tool is slightly provided with concave textures, light waves are respectively reflected by an upper interface and a lower interface of the film during infrared spectrum detection, the reflected light does not interfere with each other, and new light waves are prevented from being formed, so that strip-shaped artifacts are reduced to the minimum, and conditions are provided for accurate spectrum measurement.

Description

TECHNICAL FIELD

[0001] The utility model belongs to scientific analysis instrument technical field, concretely relates to a kind of tabletting jig and system suitable for monomer content detection in polypropylene copolymer. BACKGROUND

[0002] Infrared spectrum belongs to molecular spectrum, and is a powerful tool for determining molecular composition and structure. Infrared spectrum analysis is widely used. It can be said that for any sample, as long as the amount of sample is sufficient, an infrared spectrum can be obtained. Infrared spectrum analysis process involves various sample preparation methods to adapt to different types and sources of test samples. Common sample preparation methods include tabletting method, paste method, film method (solvent dissolution film method, hot pressing method), liquid cell method (liquid test, liquid film test) and gas cell method. For the analysis of polymer materials and finished product samples, hot pressing method is commonly used.

[0003] The spectral artifacts produced by internal reflection of the film sample obtained by hot pressing appear in the form of sine variation, which is called edge. These fringe-artifacts change the area of the absorption band, especially when analyzing samples with low ethylene content in polypropylene copolymer, which affects the accuracy. Therefore, it is of great significance to reduce fringe-artifacts by sample preparation. SUMMARY

[0004] To solve the problems of the prior art, the utility model provides a tabletting jig and system suitable for monomer content detection in polypropylene copolymer. The utility model minimizes edge artifacts by properly shaping the sample.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] In the first aspect of the utility model, a tabletting jig suitable for monomer content detection in polypropylene copolymer is provided, which includes an upper die plate, a lower die plate and a circular ring arranged between the upper and lower die plates.

[0007] The lower surface of the upper die plate is convex.

[0008] In some embodiments of the utility model, the circular ring is a copper ring, and the lower die plate is an aluminum foil.

[0009] In some embodiments of the utility model, the upper surface of the upper die plate is flat, and the lower surface is convex, and the radius of curvature R of the convex surface is greater than or equal to 300 mm.

[0010] In some embodiments of the utility model, the thickness of the circular ring is 0.01-0.05 mm.

[0011] In some embodiments of the utility model, the thickness of the circular ring is 0.05-0.1mm.

[0012] In some embodiments of the utility model, the thickness of the circular ring is 0.1mm.

[0013] In some embodiments of the utility model, the thickness of the circular ring is 0.1-0.3mm.

[0014] In some embodiments of the utility model, the thickness of the circular ring is 0.3-0.5mm.

[0015] In some embodiments of the utility model, the thickness of the circular ring is 0.5-1mm.

[0016] The second aspect of the utility model provides a tabletting system suitable for monomer content detection in polypropylene copolymer, which comprises a flat plate hot press and a mold, the mold is arranged between the upper and lower platens of the flat plate hot press, and the mold is the tabletting tool described above.

[0017] The utility model has the advantages of:

[0018] By appropriately forming the sample plate, the edge artifact can be minimized

[0019] The utility model provides a tabletting tool suitable for monomer content detection in polypropylene copolymer. In the embodiment, the upper mold can ensure that the upper surface of the obtained film sample has slightly concave texture, and can fully avoid the influence of edge artifact on precision. The upper surface of the film sample obtained by the tabletting tool through the hot pressing method has slightly concave texture, when infrared spectrum detection is carried out, light waves are reflected by the upper interface and the lower interface of the film respectively, the reflected light does not interfere, new light waves are avoided, so that the bar-shaped artifact is minimized, and conditions are provided for accurate spectrum measurement. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings constituting a part of the utility model are used to provide further understanding of the utility model, and the illustrative embodiment of the utility model and the description thereof are used to explain the utility model, and do not constitute improper limitation on the utility model.

[0021] Figure 1 It is the structure diagram of the tabletting tool suitable for monomer content detection in polypropylene copolymer of the utility model embodiment 1.

[0022] Wherein, 1 is a lower mold plate, 2 is a circular ring, and 3 is an upper mold plate. CONCRETE IMPLEMENTATION

[0023] The utility model discloses an embodiment discloses a kind of tableting jig and system suitable for monomer content detection in polypropylene copolymer, for solving the technical problem of the edge artifact appearing in the film sample obtained by high molecular material hot pressing in prior art, affecting detection accuracy.

[0024] In order to enable the personnel in the technical field to better understand the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of protection of the present application.

[0025] Please refer to Figure 1 The utility model discloses an embodiment discloses a kind of tableting jig and system suitable for monomer content detection in polypropylene copolymer, for solving the technical problem of the edge artifact appearing in the film sample obtained by high molecular material hot pressing in prior art, affecting detection accuracy.

[0026] The lower surface of the upper die plate 3 is convex.

[0027] It should be noted that the lower surface of the upper die plate 3 is convex, and the upper surface of the film sample obtained by the tableting jig through hot pressing method is slightly concave. When performing infrared spectrum detection, the light wave is reflected by the upper interface and the lower interface of the film respectively, and the reflected light does not interfere with each other, avoiding the formation of new light wave, thereby minimizing the bar-shaped artifact and providing conditions for accurate spectrum measurement.

[0028] It should be noted that the polypropylene copolymer includes but is not limited to one of propylene-butylene copolymer polypropylene, ethylene-propylene-butylene copolymer or terpolymer polypropylene, and the monomer includes but is not limited to one of ethylene and propylene.

[0029] In the present embodiment, the annular ring 2 is a copper ring, and the lower die plate 1 is an aluminum foil. Copper and aluminum are both good heat conductors, which can ensure that the sample is heated sufficiently and uniformly during the preparation of the film sample by hot pressing method.

[0030] It should be noted that the upper die plate 3 is also a heat conductor material.

[0031] In the present embodiment, the upper surface of the upper die plate 3 is a plane, and the lower surface is convex, and the radius of curvature R of the convex surface is greater than or equal to 300 mm.

[0032] It should be noted that the radius of curvature R of the convex surface is not infinite, i.e. the lower surface of the upper die plate 3 is not a plane. If it is a plane, the influence of bar-shaped artifact on detection accuracy cannot be reduced.

[0033] It should be noted that the thickness of the polypropylene copolymer film sample must be reduced with the increase of monomer during infrared spectrum detection, that is, the thickness of the film sample with different monomer contents is different, and the absorbance value of the maximum band absorption (about 725cm -1 ) and the combined band absorption (4482-3950cm -1 ) of methylene is less than ~1.5, so as to provide conditions for accurate spectrum measurement. The recommended table in Table 1 indicates the approximate required thickness of various expected component ranges.

[0034] Table 1 recommended film thickness

[0035] Monomer content Film thickness (mm) 0-2％ 0.5-1 2-5％ 0.3-0.5 5-10％ 0.1-0.3 10-25％ ～0.1 25-50％ 0.05-0.1 50％ 0.01～0.05

[0036] According to the requirements of different film thicknesses, the circular ring 2 with different thicknesses is set correspondingly, so as to provide conditions for accurate spectrum measurement.

[0037] In this embodiment, the thickness of the circular ring 2 is 0.01-0.05mm.

[0038] In this embodiment, the thickness of the circular ring 2 is 0.05-0.1mm.

[0039] In this embodiment, the thickness of the circular ring 2 is 0.1mm.

[0040] In this embodiment, the thickness of the circular ring 2 is 0.1-0.3mm.

[0041] In this embodiment, the thickness of the circular ring 2 is 0.3-0.5mm.

[0042] In this embodiment, the thickness of the circular ring 2 is 0.5-1mm.

[0043] The utility model also provides a kind of tabletting system suitable for monomer content detection in polypropylene copolymer, including flat plate hot press and mould, the mould is arranged between the upper and lower platens of the flat plate hot press, and the mould is the above tabletting tool.

[0044] For example, using flat plate hot press, film sample is pressed at ~210 DEG C temperature, sample is placed between circular ring 2, covered with upper die plate 3 and pressed into shape 1min, forms film, then releases pressure, and sample is removed from between the upper and lower platens of flat plate hot press, cooled to room temperature, removes mould, and obtains film sample. In order to achieve best effect, sample between upper and lower platens is cooled, and transparent film is formed.

[0045] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tablet press die suitable for use in the detection of monomer content in polypropylene copolymers, characterized in that, The upper die plate, the lower die plate and the circular ring are arranged in sequence. The lower surface of the upper die plate is a convex surface.

2. The tabletting tool for detecting the monomer content in a polypropylene copolymer according to claim 1, wherein the tabletting tool is a tabletting die. The circular ring is a copper ring and the lower die plate is an aluminum foil.

3. The tabletting tool for detecting the monomer content in polypropylene copolymer according to claim 1, wherein the tabletting tool is a tabletting die. The upper surface of the upper die plate is a flat surface and the lower surface is a convex surface, and the radius of curvature R of the convex surface is greater than or equal to 300 mm.

4. A tabletting tool suitable for the determination of the monomer content in polypropylene copolymers according to any one of claims 1 to 3, characterized in that The thickness of the circular ring is 0.01-0.05 mm.

5. The tabletting tool for detecting the monomer content in a polypropylene copolymer according to any one of claims 1 to 3, wherein the tabletting tool is a tabletting die. The thickness of the circular ring is 0.05-0.1 mm.

6. The tabletting tool for detecting the monomer content in a polypropylene copolymer according to any one of claims 1 to 3, wherein the tabletting tool is a tabletting die. The thickness of the circular ring is 0.1 mm.

7. The tabletting tool for detecting the monomer content in a polypropylene copolymer according to any one of claims 1 to 3, wherein the tabletting tool is a tabletting die. The thickness of the circular ring is 0.1-0.3 mm.

8. The tabletting tool for detecting the monomer content in a polypropylene copolymer according to any one of claims 1 to 3, wherein the tabletting tool is a tabletting die. The thickness of the circular ring is 0.3-0.5 mm.

9. The tabletting tool for detecting the monomer content in a polypropylene copolymer according to any one of claims 1 to 3, wherein the tabletting tool is a tabletting die. The thickness of the circular ring is 0.5-1 mm.

10. A tabletting system suitable for monomer content detection in polypropylene copolymers, characterized in that, The flat plate hot press and the die are arranged in sequence, and the die is arranged between the upper and lower pressing plates of the flat plate hot press, and the die is the tabletting die of any one of claims 1-9.

Images